U.S. patent application number 09/875492 was filed with the patent office on 2001-12-06 for sheet post-processing device.
This patent application is currently assigned to Sharp Kabushiki Kaisha. Invention is credited to Josako, Takehiko, Kanezaki, Masahiro, Nagata, Jinichi, Nanba, Toyoaki, Takada, Hironori, Tanaka, Tomomi.
Application Number | 20010048191 09/875492 |
Document ID | / |
Family ID | 27339374 |
Filed Date | 2001-12-06 |
United States Patent
Application |
20010048191 |
Kind Code |
A1 |
Nanba, Toyoaki ; et
al. |
December 6, 2001 |
Sheet post-processing device
Abstract
A sheet post-processing device comprises a feed-in opening
through which sheets of paper fed out of a copying machine are
supplied, a staple tray on which the sheets of paper to be stapled
are stacked, a stapler for stapling the sheets of paper stacked on
the staple tray, a feed-out opening for discharging the stapled
sheets of paper, and a plurality of paths for transporting the
sheets of paper from the feed-in opening, to the staple tray, and
further to the feed-out opening. The sheet post-processing device
is further characterized in that the feed-in opening is positioned
not higher than a position of an upper edge of the post-processing
tray and not lower than a position of a lower edge of the
post-processing tray. With this arrangement, the sheet
post-processing device can be arranged so as to have smaller
limitation on positions of the post-processing tray and the feed-in
opening in the sheet post-processing device.
Inventors: |
Nanba, Toyoaki; (Osaka,
JP) ; Nagata, Jinichi; (Osaka, JP) ; Tanaka,
Tomomi; (Yamatokoriyama-shi, JP) ; Kanezaki,
Masahiro; (Fukuyama-shi, JP) ; Josako, Takehiko;
(Hiroshima, JP) ; Takada, Hironori; (Hiroshima,
JP) |
Correspondence
Address: |
Mark D. Saralino
RENNER, OTTO, BOISSELLE & SKLAR, P.L.L.
Nineteenth Floor
1621 Euclid Avenue
Cleveland
OH
44115-2191
US
|
Assignee: |
Sharp Kabushiki Kaisha
|
Family ID: |
27339374 |
Appl. No.: |
09/875492 |
Filed: |
June 6, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
09875492 |
Jun 6, 2001 |
|
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|
09189546 |
Nov 11, 1998 |
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Current U.S.
Class: |
271/303 |
Current CPC
Class: |
B65H 2404/632 20130101;
B65H 29/58 20130101; B65H 31/3027 20130101; B65H 2405/20 20130101;
B42C 1/12 20130101; B65H 2301/42262 20130101 |
Class at
Publication: |
271/303 |
International
Class: |
B65H 029/58 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 14, 1997 |
JP |
9-314003 |
Nov 17, 1997 |
JP |
9-315712 |
Nov 17, 1997 |
JP |
9-315707 |
Claims
What is claimed is:
1. A sheet post-processing device, comprising: a feed-in opening
through which sheets of paper fed out of an image forming device
are supplied; a post-processing tray on which the sheets of paper
are stacked; and a post-processing section for applying a
post-processing operation to the sheets of paper stacked on said
post-processing tray, wherein said feed-in opening is positioned
not higher than a position of an upper edge of said post-processing
tray and not lower than a position of a lower edge of said
post-processing tray.
2. The sheet post-processing device as set forth in claim 1,
wherein said post-processing tray is provided so as to have such
inclination that a length of said post-processing tray projected on
a vertical plane is greater than a length of said post-processing
tray projected on a horizontal plane.
3. The sheet post-processing device as set forth in claim 2,
wherein said post-processing tray is equipped with a sheet
supporting member on which the sheets of paper are carried, said
sheet supporting member being provided on a surface of said
post-processing tray on a side opposite to a feed-in opening
side.
4. The sheet post-processing device as set forth in claim 3,
further comprising a detour transport path through which the sheets
of paper supplied through said feed-in opening are transported to
said sheet supporting member by going around the upper edge or the
lower edge of said post-processing tray.
5. The sheet post-processing device as set forth in claim 4,
further comprising a reversing transport path for reversing the
sheets of paper to be sent to said detour transport path.
6. The sheet post-processing device as set forth in claim 5,
wherein said reversing transport path is substantially
perpendicularly provided between said post-processing tray and said
feed-in opening.
7. The sheet post-processing device as set forth in claim 5, where
in said reversing transport path is formed so that end portions of
said reversing transport path and said detour transport path in the
vicinity of a junction therebetween are linearly provided.
8. The sheet post-processing device as set forth in claim 3,
wherein said post-processing tray has a sheet passing opening
through which the sheets of paper are transported from the feed-in
opening side of said post-processing tray to the surface thereof on
which said sheet supporting member is provided, so that the sheets
of paper are carried on said sheet supporting member, said sheet
post-processing device further comprising a direct transport path
for transporting the sheets of paper from said feed-in opening to
said sheet passing opening.
9. The sheet post-processing device as set forth in claim 3,
further comprising: a first feed-out opening for discharging the
post-processed sheets of paper; and a first feed-out path for
transporting the sheets of paper from a lower edge of said sheet
supporting member to said first feed-out opening.
10. The sheet post-processing device as set forth in claim 4,
further comprising: a second feed-out opening for discharging the
sheets of paper without applying a post-processing operation
thereto; and a second feed-out path for transporting the sheets of
paper to said second feed-out opening.
11. The sheet post-processing device as set forth in claim 5,
wherein said post-processing tray includes a sheet passing opening
through which the sheets of paper are transported from the feed-in
opening side of said post-processing tray to the surface on which
said sheet supporting member is provided, so that the sheets of
paper are carried on said sheet supporting member, said sheet
post-processing device further comprising a direct transport path
for transporting the sheets of paper from the feed-in opening to
the sheet passing opening.
12. The sheet post-processing device as set forth in claim 11,
wherein: an end of said reversing transport path and said sheet
passing opening are provided in the vicinity of an end of said
direct transport path, said sheet post-processing device further
comprising: a fed-in sheet transport destination switching section
for switching a destination of the sheets of paper transported
through said direct transport path, either to said reversing
transport path or said sheet passing opening.
13. The sheet post-processing device as set forth in claim 12,
wherein said fed-in sheet transport destination switching section
includes: first switching rollers for supplying the sheets of paper
with a transport force; and a first switching gate for guiding the
sheets of paper sent from said first switching rollers, either to
said reversing transport path or said sheet passing opening.
14. The sheet post-processing device as set forth in claim 12,
wherein said fed-in sheet transport destination switching section
includes: second switching rollers composed of three associated
rollers; and a second switching gate, wherein: said second
switching rollers includes: a first driving roller rotatable in
both non-reverse and reverse directions, a first driven roller
provided in contact with said first driving roller so as to catch
the sheets of paper therebetween when said first driving roller
rotates in the non-reverse direction so that the sheets of paper
are sent to said reversing transport path, and a second driven
roller provided in contact with said first driving roller so as to
catch the sheets of paper therebetween when said first driving
roller rotates in the reverse direction so that the sheets of paper
are sent to said sheet passing opening; and said second switching
gate guides the supplied sheets of paper either to between said
first driving roller and said first driven roller or to between
said first driving roller and said second driven roller.
15. The sheet post-processing device as set forth in claim 14,
further comprising: a predetermined number of transport rollers for
supplying a transport force to the sheets of paper on said
transport path, said transport rollers being rotatable in one
rotational direction; a first driving system for driving said
transport rollers; and a second driving system for driving said
second switching rollers.
16. The sheet post-processing device as set forth in claim 11,
wherein: said reversing transport path is provided so that an end
thereof is connected with an end of said direct transport path, in
the vicinity of said sheet passing opening; and a part of said
post-processing tray and said reversing transport path are
pivotably provided, so that, by pivoting the part of said
post-processing tray and said reversing transport tray together
thereby causing either said sheet passing opening or the end of
said reversing transport path to get close to the end of said
direct transport path, the sheets of paper transported through the
direct transport path are guided either said sheet passing opening
or said reversing transport path.
17. The sheet post-processing device as set forth in claim 4,
wherein said post-processing tray includes a sheet passing opening
through which the sheets of paper are transported from the feed-in
opening side of said post-processing tray to the surface on which
said sheet supporting member is provided, so that the sheets of
paper are carried on said sheet supporting member, said sheet
post-processing device further comprising a direct transport path
for transporting the sheets of paper from the feed-in opening to
the sheet passing opening.
18. The sheet post-processing device as set forth in claim 17,
wherein said detour transport path transports the sheets of paper
supplied through said feed-in opening so that the sheets of paper
are sent to said sheet supporting member by go around the upper
edge of said post-processing tray.
19. The sheet post-processing device as set forth in claim 18,
wherein said post-processing tray has a paper guide for preventing
the sheets of paper stacked on said post-processing tray from
falling down, said paper guide being provided on an inward side of
said detour transport path so as to face said post-processing
tray.
20. The sheet post-processing device as set forth in claim 19,
wherein said paper guide is composed of a plurality of plates
joined with each other in such a manner that the plates are
pivotable.
21. The sheet post-processing device as set forth in claim 20,
wherein: said paper guide is composed of two plates, namely, an
upper plate and a lower plate, joined with each other in such a
manner that said plates are pivotable; an upper edge of said upper
plate is fit to a frame of said sheet post-processing device in
such a manner that said upper plate is pivotable; and said lower
plate has a catching part for causing said lower plate to be caught
on said frame of said sheet post-processing device.
22. The sheet post-processing device as set forth in claim 21,
wherein said catching part is a magnet.
23. The sheet post-processing device as set forth in claim 21,
wherein a handle is provided on said lower plate.
24. The sheet post-processing device as set forth in claim 23,
wherein said lower plate has a contacting plate on a lower edge
thereof, while said frame of said sheet post-processing device has
a contacted plate to which said contacting plate is brought into
contact, said contacting plate being brought into contact with said
contacted plate when said lower plate is moved in such a direction
that said paper guide is opened.
25. The sheet post-processing device as set forth in claim 24,
wherein said handle, said catching part, and said contacting plate
are provided in this order from the top on said lower plate.
26. A sheet post-processing device, comprising: a post-processing
tray on which sheets of paper supplied from an image forming device
are stacked; a post-processing section for applying a
post-processing operation to edges of one side of the sheets of
paper stacked on said post-processing tray; a first feed-out
opening for discharging, to outside, the sheets of paper having
been subject to the post-processing operation; a first discharge
transport path for transporting the sheets of paper from said
post-processing tray to said first feed-out opening; and a feed-out
section for discharging the post-processed sheets of paper from
said post-processing tray to said first discharge transport path,
wherein said post-processing tray has an adjusting-moving section
for adjusting said stacked sheet of paper, moving the adjusted
sheets of paper to a post-processing position at which a
post-processing operation by said post-processing section can be
applied, and moving said post-processed sheets of paper to a
discharge position at which a discharging operation by said
feed-out section is applied.
27. The sheet post-processing device as set forth in claim 26,
wherein said feed-out section discharges the sheets of paper from
the discharge position, with edges of the sheets of paper to which
the post-processing operation is applied by said post-processing
section going in front.
28. The sheet post-processing device as set forth in claim 27,
wherein said adjusting-moving section includes a sheet supporting
member which adjusts lower edges of the sheets of paper stacked on
said post-processing tray, and slides on said post-processing tray
while carrying the sheets of paper thereon so that the sheets of
paper are moved to the post-processing position and the discharge
position.
29. The sheet post-processing device as set forth in claim 28,
wherein: said post-processing tray is substantially perpendicularly
provided, and said post-processing section and said first discharge
transport path are provided below said post-processing tray; and
said sheet supporting member remains at a predetermined stacking
position until a predetermined number of sheets of paper are
stacked thereon, subsequently brings the sheets of paper down to
the post-processing position, and brings the sheets of paper up to
a predetermined recessional position after the post-processing
operation is applied to the sheets of paper by said post-processing
section at the post-processing position, and thereafter brings the
sheets of paper down to the discharge position.
30. The sheet post-processing device as set forth in claim 29,
wherein said feed-out section has a third switching gate for
guiding the sheets of paper to either the post-processing position
or the discharge position when said sheet supporting member slides
down.
31. The sheet post-processing device as set forth in claim 30,
wherein said feed-out section has discharge rollers for supplying a
transport force in a downward direction to the sheets of paper when
the sheets of paper are placed at the discharge position, so that
the sheets of paper are sent to said first discharge transport
path.
32. The sheet post-processing device as set forth in claim 28,
wherein said adjusting-moving section includes a sheet adjusting
member for adjusting side edges of the sheets of paper by sliding
on said post-processing tray in a direction perpendicular to the
side edges of the sheets of paper stacked on said post-processing
tray.
33. The sheet post-processing device as set forth in claim 32,
wherein said sheet adjusting member has a sheet guide part for
preventing the sheets of paper stacked on said post-processing tray
from falling down.
34. The sheet post-processing device as set forth in claim 32,
wherein said adjusting-moving section has a paddler for supplying a
downward force to the sheets of paper stacked on said
post-processing tray so as to assist said sheet supporting member
in adjusting the lower edges of the sheets of paper.
35. The sheet post-processing device as set forth in claim 32,
wherein at least either said sheet supporting member or said sheet
adjusting member has conductivity and is grounded.
36. The sheet post-processing device as set forth in claim 27,
wherein said first discharge transport path is substantially
horizontally provided from a lower edge of said post-processing
tray to said first feed-out opening.
37. The sheet post-processing device as set forth in claim 27,
wherein said post-processing section applies a stapling operation
to the sheets of paper.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a sheet post-processing
device which is provided to an image forming device having
functions of copying, facsimiling, printing, and the like, and
which feeds out sheets of paper supplied from the image forming
device after performing a post-processing operation such as a
stapling operation with respect to the sheets of paper.
BACKGROUND OF THE INVENTION
[0002] A recent copying machine is designed so as to be used in
combination with an automatic document transporting device and a
sheet post-processing device, for realizing automation of a copying
operation, and automation of a stapling operation or a punching
operation with respect to sheets of paper having been subject to
the copying operation, and the like.
[0003] The sheet post-processing device is a device which performs
a post-processing operation such as stapling or punching with
respect to sheets of paper which are fed out of a copying machine
after original images are copied thereon, so that every stack of
paper, which is composed of a predetermined number of sheets of
paper, is stapled or punched.
[0004] For example, one conventional sheet post-processing device
is disclosed by the U.S. Pat. No. 5,072,920 (the Japanese
Publication for Laid-Open Patent Application No. 3-227694/1991
(Tokukaihei 3-227694)). FIG. 22 is an explanatory view illustrating
an arrangement of a sheet post-processing device 100 disclosed by
the publication.
[0005] In the sheet post-processing device 100, sheets of paper fed
out of a copying machine main body are fed in through a feed-in
opening 108. Then, in the case where the stapling operation is
applied to the sheets, the sheets are guided by a gate 101 to a
path 102.
[0006] The sheets transported through the path 102 are introduced
to a staple tray 103 from its bottom upward, so that the sheets are
stacked thereon.
[0007] When a predetermined number of the sheets are stacked on the
staple tray 103, a stapling operation is applied by a stapler 104
to a lower edge of the sheets thus stacked. The stack of paper thus
stapled is moved upward, with its lower edge pushed up by a
discharge belt 105, and the stack of paper is brought up till being
discharged onto a discharge tray 106. Upon discharge, the stacked
sheets are transported with the edges to which the stapling
operation is not applied going in front in the transporting
direction.
[0008] According to the arrangement of the sheet post-processing
device 100, however, the sheets to be subject to the stapling
operation are fed in through the feed-in opening 108 which is
positioned above the staple tray 103. The sheets are transported
through the path 102 and introduced onto the staple tray 103 from
below, thereby being stacked thereon.
[0009] For this reason, the path 102 is curved substantially in a U
shape in the vicinity of junction of the path 102 with the staple
tray 103, and in the case of the aforementioned arrangement, it is
necessary to increase a radius of curvature of the curving part to
some extent. This is because jamming of paper tends to occur during
transportation in the case where the radius of curvature is set too
small. Therefore, the foregoing arrangement has a drawback in that
a floor area that the sheet post-processing device 100 occupies
becomes large.
[0010] Further, as described above, in the sheet post-processing
device, the feed-in opening 108 is formed at a position higher than
that for the staple tray 103. In such an arrangement as relative
position relationship between the staple tray 103 and the feed-in
opening 108 is thus specified, a position for the staple tray 103
or the feed-in opening 108 is limited, thereby, for example,
causing a space around the staple tray 103 to be narrowed, and
limiting freedom in designing the sheet post-processing device.
Such limitation is likewise caused in the case where the feed-in
opening 108 is formed at a position lower than that for the staple
tray 103.
[0011] Furthermore, with the foregoing arrangement of the sheet
post-processing device 100, upon discharge of the stapled sheets of
paper, the stacked sheets are transported with the edges to which
the stapling operation is not applied going in front in the
transporting direction. Therefore, upon paper discharge, the front
edges of the stacked sheets tend to fan out, causing lower sheets
to be bent under upper sheets.
[0012] Another conventional sheet post-processing device is
arranged so that the stapler is moved to a stapling position so as
to perform the stapling operation with respect to the stack of
paper on the staple tray. With the foregoing arrangement wherein
the stapler is moved, however, there arises a drawback in that
structure of the sheet post-processing device becomes complicated,
or a drawback in that the sheet post-processing device becomes
bulkier.
[0013] Incidentally, jamming of paper tends to take place during
transportation of paper, in the case of a sheet post-processing
device which is arranged so that sheets of paper ejected from the
copying machine are stacked on a post-processing tray so that the
stapling operation as the post-processing operation is applied to
the stack of paper thereon, and thereafter the stack of paper is
discharged onto a discharge tray. In this case, a jamming sheet is
not easily taken out, unless the transport path inside the sheet
post-processing device is openable.
[0014] Such a structure which facilitates taking out of a jamming
sheet is hereinafter referred to as a paper jam solving structure.
A copying machine with such a paper jam solving structure is
disclosed by, for example, the U.S. Pat. No. 4,952,989 (the
Japanese Publication for Laid-Open Patent Application No.
61-239256/1986 (Tokukaisho 61-239256)).
[0015] FIG. 23 is an explanatory view illustrating a sheet
transport path in the copying machine disclosed by the foregoing
publication. As shown in FIG. 23, in this copying machine, a sheet
(paper) is fed from feed cassettes 201 through feed rollers 202,
203, and 204 to a position below a photoreceptor 205. Subsequently,
an image on the photoreceptor 205 is transferred to the sheet, and
thereafter the sheet is transported to a fixing device (not shown)
by a conveyer belt 206 provided with air suction means. After a
fixing operation, the sheet is fed out.
[0016] Here, in the copying machine, the conveyer belt 206 is
substantially horizontally disposed. Besides, the conveyer belt 206
is movably provided so as to incline downward by pivoting around a
shaft 206a provided on a downstream side of a transport direction.
Furthermore, a supporting member 207 of the feed rollers 203 is
provided vertically, and rotatably with respect to a shaft 207a
provided in a bottom part of the supporting member 207.
[0017] Furthermore, the conveyer belt 206 is supported by a
supporting arm 209. The supporting arm 209 has a roller 208 at its
top end, and is supported by a shaft 209a provided at a bottom end
thereof so that the supporting arm 209 is rotatable with respect to
the shaft 209a.
[0018] The supporting member 207 is supported by a connecting piece
210, with one side of the supporting member 207 being pinned to one
end of the connecting piece 210. The other end of the connecting
piece 210 is rotatably connected to a middle part of the supporting
arm 209.
[0019] In the case of the foregoing arrangement, if jamming of
paper takes place, the supporting arm 209 is rotated around the
shaft 209a as axis in an anti-clockwise direction, as shown in FIG.
24. With the rotation, the conveyer belt 206 rotates around the
shaft 206a as axis in a clockwise direction. As a result, a
transport path between the photoreceptor 205 and the conveyer belt
206 is opened.
[0020] Besides, the anti-clockwise rotation (laying down) of the
supporting arm 209 causes the connecting piece 210 to pull the
supporting member 207. As a result, a transport path facing the
feed rollers 203 is opened.
[0021] Thus, the copying machine is arranged so that only by laying
down the supporting arm 209, the transport paths on the feed-in and
feed-out sides with respect to the photoreceptor 205 are opened,
whereby jamming of paper is easily solved.
[0022] In the paper jam solving structure of the foregoing copying
machine, however, the supporting arm 209 for supporting the
conveyer belt 206 is rotatably provided so that the transport path
is openable. Therefore, a sufficient space is required to allow the
supporting arm 209 to rotate. In other words, the aforementioned
paper jam solving structure has the following drawback in that
ensuring that the transport path can be sufficiently opened makes
it difficult to form the copying machine thinner.
SUMMARY OF THE INVENTION
[0023] The first object of the present invention is to provide a
sheet post-processing device arranged so that limitation on
positions of a post-processing tray (stapling tray) and a feed-in
opening of the sheet post-processing device is small.
[0024] The second object of the present invention is to provide a
sheet post-processing device which is capable of stably discharging
sheets of paper while which is neither complicated nor bulky.
[0025] To achieve the aforementioned first object, the sheet
post-processing device of the present invention comprises (1) a
feed-in opening through which sheets of paper fed out of an image
forming device are supplied, (2) a post-processing tray on which
the sheets of paper are stacked, and (3) a post-processing section
for applying a post-processing operation to the sheets of paper
stacked on the post-processing tray, and is characterized in that
the feed-in opening is positioned not higher than a position of an
upper edge of the post-processing tray and not lower than a
position of a lower edge of the post-processing tray.
[0026] With the foregoing arrangement, a part of the
post-processing tray is positioned higher than the position of the
feed-in opening. Consequently, the limitation on the positions of
the post-processing tray and the feed-in opening in the sheet
post-processing device can be made smaller.
[0027] Furthermore, with the foregoing arrangement, the
post-processing tray can be disposed in an upper part of the sheet
post-processing device. Therefore, it is possible to ensure a
sufficient discharge capacity even in the case where the
post-processed sheets of paper are fed out through the lower edge
of the post-processing tray onto the discharge tray, without
bringing them up.
[0028] Furthermore, to achieve the second object, the sheet
post-processing device of the present invention comprises (1) a
post-processing tray, (2) a post-processing section for applying a
post-processing operation to edges of one side of the sheets of
paper stacked on the post-processing tray, (3) a first feed-out
opening for discharging, to outside, the sheets of paper having
been subject to the post-processing operation, (4) a first
discharge transport path for transporting the sheets of paper from
the post-processing tray to the first feed-out opening, and (5) a
feed-out section for discharging the post-processed sheets of paper
from the post-processing tray to the first discharge transport
path, and is characterized in that the post-processing tray has an
adjusting-moving section for adjusting the stacked sheet of paper,
moving the adjusted sheets of paper to a post-processing position
at which a post-processing operation by the post-processing section
can be applied, and moving the post-processed sheets of paper to a
discharge position at which a discharging operation by the feed-out
section is applied.
[0029] With the foregoing arrangement, the sheets of paper stacked
on the post-processing tray are moved to the post-processing
position by the adjusting-moving section. The post-processing
position is a position at which a post-processing operation can be
applied to the sheets of paper by the post-processing section.
Then, the sheets of paper thus post-processed are moved to the
discharge position by the adjusting-moving section. The discharge
position is a position at which the discharging operation can be
applied to the sheets of paper by the feed-out section.
[0030] Thus, according to the foregoing arrangement, upon
application of the post-processing operation to the sheets of paper
stacked on the post-processing tray, not the post-processing
section but the sheets of paper are moved. Therefore, with the
foregoing arrangement, there is no need to provide a driving system
for moving the post-processing section, and therefore, it is
possible to make the sheet post-processing device simpler and
smaller.
[0031] For a fuller understanding of the nature and advantages of
the invention, reference should be made to the ensuing detailed
description taken in conjunction with the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0032] FIG. 1 is an explanatory view illustrating a schematic
arrangement of a sheet post-processing device in accordance with
first through third embodiments of the present invention.
[0033] FIG. 2 is an explanatory view illustrating paths of the
sheet post-processing device shown in FIG. 1.
[0034] FIG. 3 is an explanatory view illustrating driving systems
of transport rollers of the sheet post-processing device shown in
FIG. 1.
[0035] FIG. 4 is a plan view illustrating the driving system of
reversing rollers of the sheet post-processing device shown in FIG.
1.
[0036] FIG. 5(a) is an explanatory view showing a switched state of
a feed-in gate, a reversing gate, and a switching gate of the sheet
post-processing device shown in FIG. 1 in the case where the
stapling operation is applied to the sheets of paper smaller than
the letter size.
[0037] FIG. 5(b) is an explanatory view showing a switched state of
the feed-in gate, the reversing gate, and the switching gate of the
sheet post-processing device shown in FIG. 1 in the case where the
sheets of paper supplied from a copying machine are sent to a
reversing path.
[0038] FIG. 5(c) is an explanatory view showing a switched state of
the feed-in gate, the reversing gate, and the switching gate of the
sheet post-processing device shown in FIG. 1 in the case where the
sheets of paper sent to the reversing path is switched back, and
thereafter sent to a detour path via a connecting path.
[0039] FIG. 5(d) is an explanatory view showing a switched state of
the feed-in gate, the reversing gate, and the switching gate of the
sheet post-processing device shown in FIG. 1 in the case where the
sheets of paper supplied from the copying machine are directly sent
to the detour path.
[0040] FIG. 6(a) is an explanatory view illustrating the stapling
operation in the sheet post-processing device shown in FIG. 1,
particularly showing a state in which sheets of paper are stacked
on a lower staple tray.
[0041] FIG. 6(b) is an explanatory view illustrating the stapling
operation in the sheet post-processing device shown in FIG. 1,
particularly showing a state in which a sheet supporter is brought
down and a stapling operation is applied to the stack of paper.
[0042] FIG. 6(c) is an explanatory view illustrating the stapling
operation in the sheet post-processing device shown in FIG. 1,
particularly showing a state in which a sheet supporter is brought
down and a stapling operation is applied to the stack of paper.
[0043] FIG. 6(d) is an explanatory view illustrating the stapling
operation in the sheet post-processing device shown in FIG. 1,
particularly showing a state in which the stapled stack of paper is
discharged onto an offset tray.
[0044] FIG. 7(a) is an explanatory view illustrating a switched
state of the feed-in gate, the reversing gate, and the switching
gate, in the case where three associated rollers are used as the
reversing rollers in the sheet post-processing device shown in FIG.
1, and in the case where the stapling operation is applied to
sheets of paper smaller than the letter size.
[0045] FIG. 7(b) is an explanatory view illustrating a switched
state of the feed-in gate, the reversing gate, and the switching
gate in the case where three associated rollers are used as the
reversing rollers in the sheet post-processing device shown in FIG.
1, particularly showing a state in which the sheets of paper
supplied from the copying machine are sent to the reversing
path.
[0046] FIG. 7(c) is an explanatory view illustrating a switched
state of the feed-in gate, the reversing gate, and the switching
gate in the case where three associated rollers are used as the
reversing rollers in the sheet post-processing device shown in FIG.
1, particularly showing a state in which the sheets of paper sent
to the reversing path are switched back and sent to the detour path
via the connecting path.
[0047] FIG. 7(d) is an explanatory view illustrating a switched
state of the feed-in gate, the reversing gate, and the switching
gate in the case where three associated rollers are used as the
reversing rollers in the sheet post-processing device shown in FIG.
1, particularly showing a state in which the sheets of paper
supplied from the copying machine are directly sent to the detour
path.
[0048] FIG. 8(a) is an explanatory view illustrating a state of
sheet transportation in which the sheets of paper supplied from the
copying machine are sent to the lower staple tray, in the case
where the reversing path and the lower staple tray of the sheet
post-processing device shown in FIG. 1 are arranged so as to be
pivotable.
[0049] FIG. 8(b) is an explanatory view illustrating a state of
sheet transportation in which the sheets of paper supplied from the
copying machine are sent to the reversing path, or a state of sheet
transportation in which the sheets of paper sent to the reversing
path are once switched back and thereafter sent to the detour path
via the connecting path, in the case where the reversing path and
the lower staple tray of the sheet post-processing device shown in
FIG. 1 are arranged so as to be pivotable.
[0050] FIG. 9 is an explanatory view illustrating a schematic
arrangement of another sheet post-processing device in accordance
with the first embodiment of the present invention and a copying
machine connected to the sheet post-processing device.
[0051] FIG. 10 is an explanatory view illustrating a schematic
arrangement of still another sheet post-processing device in
accordance with the first embodiment of the present invention and a
copying machine connected to the sheet post-processing device.
[0052] FIG. 11 is an explanatory view illustrating a schematic
arrangement of still another sheet post-processing device in
accordance with the first embodiment of the present invention and a
copying machine connected to the sheet post-processing device.
[0053] FIG. 12 is an explanatory view illustrating a schematic
arrangement of still another sheet post-processing device in
accordance with the first embodiment of the present invention and a
copying machine connected to the sheet post-processing device.
[0054] FIG. 13 is an explanatory view illustrating a schematic
arrangement of still another sheet post-processing device in
accordance with the first embodiment of the present invention and a
copying machine connected to the sheet post-processing device.
[0055] FIG. 14 is an explanatory view illustrating a schematic
arrangement of still another sheet post-processing device in
accordance with the first embodiment of the present invention and a
copying machine connected to the sheet post-processing device.
[0056] FIG. 15 is a side view illustrating an arrangement of a
stapling system of the sheet post-processing device shown in FIG.
1.
[0057] FIG. 16 is a front view illustrating an arrangement of the
stapling system shown in FIG. 15.
[0058] FIG. 17(a) is an explanatory view illustrating a state of a
stapling operation by the stapling system shown in FIG. 15, in
which sheets of paper are being stacked on a lower staple tray.
[0059] FIG. 17(b) is an explanatory view illustrating a state of
the stapling operation by the stapling system shown in FIG. 15, in
which a stack of paper composed of a predetermined number of sheets
of paper is formed on the lower staple tray.
[0060] FIG. 17(c) is an explanatory view illustrating a state of
the stapling operation by the stapling system shown in FIG. 15, in
which the stack of paper is inserted to the stapler.
[0061] FIG. 18(a) is an explanatory view illustrating a state of
the stapling operation by the stapling system shown in FIG. 15, in
which a stapling operation by the stapler is applied to the stack
of paper.
[0062] FIG. 18(b) is an explanatory view illustrating a state of
the stapling operation by the stapling system shown in FIG. 15, in
which the stack of paper stapled is separated from the stapler.
[0063] FIG. 18(c) is an explanatory view illustrating a state of
the stapling operation by the stapling system shown in FIG. 15, in
which the switching gate is turned so that the stack of paper
stapled and separated from the stapler is discharged on the offset
tray.
[0064] FIG. 19(a) is an explanatory view illustrating a state of
the stapling operation by the stapling system shown in FIG. 15, in
which the stack of paper is brought down to the switching gate
after the switching gate is turned so that the stack of paper is
discharged on the offset tray.
[0065] FIG. 19(b) is an explanatory view illustrating a state of
the stapling operation by the stapling system shown in FIG. 15, in
which the stack of paper on the switching gate is pressed by the
transport rollers.
[0066] FIG. 19(c) is an explanatory view illustrating a state of
the stapling operation by the stapling system shown in FIG. 15, in
which the stack of paper on the switching gate is sent by the
transport rollers to the offset tray discharge path.
[0067] FIG. 20 is a side view illustrating an arrangement of a
paper guide as a paper jam solving system of the sheet
post-processing device shown in FIG. 1.
[0068] FIG. 21 is a front view illustrating an arrangement of the
paper guide shown in FIG. 20.
[0069] FIG. 22 is an explanatory view illustrating an arrangement
of a conventional sheet post-processing device.
[0070] FIG. 23 is an explanatory view illustrating a transport path
of a conventional copying machine.
[0071] FIG. 24 is an explanatory view illustrating a state in which
the transport path of a sheet post-processing device of the copying
machine is opened.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0072] [First Embodiment]
[0073] The following description will explain a first embodiment of
the present invention.
[0074] FIG. 1 is an explanatory view illustrating an arrangement of
a sheet post-processing device 1 as a sheet post-processing device
in accordance with the present embodiment. As shown by the figure,
the sheet post-processing device 1 is disposed on a side of a
feed-out opening 3 of a copying machine 2.
[0075] The copying machine 2 is an image forming device such as a
usual copying machine, for example, a digital copying machine or a
digital color copying machine. The sheet post-processing device 1
is supplied with sheets of paper, OHP sheets, and the like, fed out
of the copying machine 2, so as to perform a post-processing
operation such as stapling, a sheet sorting operation, and the like
with respect to the sheets thus supplied thereto.
[0076] The following description will explain an arrangement of the
sheet post-processing device 1.
[0077] The sheet post-processing device 1 has a feed-in opening 4
through which sheets of paper fed out of the copying machine 2 are
supplied. The feed-in opening 4 is at a position not lower than the
lower edge of a staple tray 10 which will be described later, and
not higher than the upper edge of the staple tray 10.
[0078] The sheet post-processing device 1 is arranged so as to be
separable from the copying machine 2 in a sheet discharge direction
(rightward as viewed in FIG. 1). Therefore, it is possible to
disposing of jamming sheets or to exchange staple needles in a
state in which the sheet post-processing device 1 is separated from
the copying machine 2.
[0079] When the sheet post-processing device 1 is connected to the
copying machine 2, an inclining rail attached on the side of the
sheet post-processing device 1 is placed on a guide member on the
side of the copying machine 2. Consequently, a height of the
feed-out opening 3 of the copying machine 2 coincides to a height
of the feed-in opening 4 of the sheet post-processing device 1 with
high precision.
[0080] In the sheet post-processing device 1, a plurality of sheets
of paper which are stapled are fed out of a feed-out opening (first
feed-out opening) 5. To store the sheets of paper discharged from
the feed-out opening 5, an offset tray (first discharge tray) 11 is
provided.
[0081] The offset tray 11 is a discharge tray which is movable
upward/downward driven by a elevation motor 51, and capable of an
offset sorting operation. A driving force of the elevation motor 51
is transmitted to the offset tray 11 through a driving force
transmitting system 52 composed of gears and the like, then,
through a driving wire 53.
[0082] The offset tray 11 has a double structure, composed of a
lower offset tray reinforcing plate 11a and an upper offset tray
plate 11b. The offset tray plate 11b is movably provided so as to,
with a driving force of an offset motor 54, shift in parallel with
the offset tray reinforcing plate 11a. Note that the direction of
the movement of the offset tray plate 11b is perpendicular to a
sheet transport direction.
[0083] Furthermore, to discharge a plurality of sheets of paper or
stacks of sheets of paper and to apply the offset sorting operation
with respect to the sheets or stacks, the offset tray plate 11b is
shifted rightward and leftward alternately, every time one sheet or
one stack is fed out. By so doing, the sheets or the stacks are
stored on the offset tray 11 in a state in which they are offsetted
rightward and leftward alternately. Therefore, even in the case
where the stapling operation is not applied, the stack sorting
operation becomes very easy.
[0084] Furthermore, the sheet post-processing device 1 has feed-out
openings (second feed-out openings) 6 and 7 as openings through
which sheets of paper are fed out, in addition to the feed-out
opening 5. As discharge trays other than the offset tray 11, two
fixed trays (second discharge trays), namely, an upper fixed tray
12 and a lower fixed tray 13, are provided, corresponding to the
feed-out openings 6 and 7, respectively.
[0085] Therefore, in the case where the copying machine 2 operates
in three-type operational modes, namely, a copy mode, a facsimile
mode, and a print mode, the trays 11 through 13 can be used
depending on the operational mode.
[0086] Incidentally, in the case where the stapling operation is
not applied to sheets of paper, the sheet post-processing device 1
is arranged so that the offset tray 11, the upper fixed tray 12,
and the lower fixed tray 13 are used in the copy mode, in the
facsimile mode, and in the print mode, respectively, as the
discharge tray. In the case where the stapling operation is applied
to sheets, the sheet post-processing device 1 is arranged so that,
irrelevant to the operational modes of the copying machine 2,
stacks of sheets of paper are discharged onto the offset tray
11.
[0087] The sheet post-processing device 1 further includes, in the
vicinity of an upper part thereof, a staple tray 10 for stacking
sheets to which the stapling operation is to be applied.
[0088] The staple tray 10 is arranged so that sheets are stacked on
a surface opposite to the feed-in opening 4 side (a sheet-carrying
surface). The staple tray 10, separated into an upper staple tray
14 and a lower staple tray 15, is substantially vertically
disposed. Through a gap (sheet passing opening, aperture) G between
the trays 14 and 15, sheets of paper are transported from a direct
path 21 (described later) to the lower staple tray 15.
[0089] The staple trays 14 and 15 are trays for temporarily storing
stacks of paper to which the stapling operation is to be applied,
and are formed perpendicularly (vertically), with the gap G
therebetween. The lower staple tray 15 also serves as a path which
forms a part of a sheet transport path in the sheet post-processing
device 1.
[0090] Besides, the staple tray 10 is equipped with a sheet
supporter 55, a paddler 56, and adjusting plates 57, as shown in
FIG. 1.
[0091] The sheet supporter (sheet supporting member) 55 is a member
with which lower edges of a plurality of sheets of paper stacked
are in contact so as to be adjusted, and is movably provided so as
to shift upward/downward along the lower staple tray 15. The sheet
supporter 55 shifts upward/downward in a state of carrying the
sheets of paper, so that the stack of paper is moved to a stacking
position, a stapling position (post-processing position), or a
recessional position, and a discharge position which are
predetermined.
[0092] More specifically, the sheet supporter 55 places sheets of
paper at the stacking position when the sheets are being stacked on
the staple tray 10. Then, when a predetermined number of sheets are
stacked on the staple tray 10, the sheet supporter 55 is shifted
downward so that the stack of sheets of paper is moved to the
stapling position.
[0093] After the stapling operation is applied to the stack of
paper, the sheet supporter 55 is shifted upward so that the stack
of paper is moved to the recessional position. To discharge the
stack of paper onto the offset tray 11, the sheet supporter 55
descends so as to bring down the stack of paper to the
predetermined discharge position. Note that upon discharge, the
stack of paper is transported to the offset tray 11 through an
offset tray discharge path 27 which will be described later.
[0094] The adjusting plates (sheet adjusting member) 57 supports
the stack of paper placed on the sheet supporter 55 from both sides
of the stack, so that side edges of the stacked sheets of paper are
adjusted.
[0095] Further, the paddler 56 is for ensuring that the sheets of
paper are carried on the sheet supporter 55. The paddler 56 is
arranged so as to rotate in the anti-clockwise direction as viewed
in FIG. 1 every time one sheet is supplied to the lower staple tray
15. Since the rotation of the paddler 56 gives a downward
transporting force to the sheets, the sheets are surely adjusted on
the sheet supporter 55. As a result, it is possible to prevent the
sheets from becoming untidy on the sheet supporter 55 due to static
electricity or the like.
[0096] Furthermore, the sheet post-processing device 1 incorporates
a stapler (post-processing section) 59. The stapler 59 is for
applying a stapling operation with respect to sheets of paper, and
is disposed below the staple tray 10. The stapler 59 applies the
stapling operation with respect to the stack of paper when the
stack descends to the stapling position.
[0097] Moreover, the sheet post-processing device 1 incorporates a
paper guide 70 for catching the sheets of paper stacked on the
staple tray 10. The paper guide 70 is for catching at least upper
edges of the sheets, and is composed of two plates, namely, an
upper plate 71 and a lower plate 72. Incidentally, it is possible
to manually move the paper guide 70 to a predetermined recessional
position, upon a paper jam solving operation.
[0098] As described above, the staple tray 10 is disposed
substantially perpendicularly, and further, in the upper staple
tray 14 region, the stack of paper is supported only from one side.
Therefore, the stacked sheets of paper may fall down to an opposite
side to the staple tray 10 (right-hand side as viewed in FIG. 1).
To avoid this, in the sheet post-processing device 1, the sheets of
paper are held so that the staple tray 10 and the paper guide 70
catch the sheets therebetween, to prevent such falling of the
sheets.
[0099] The sheet post-processing device 1 includes a plurality of
paths (sheet passing path, transport path) corresponding to
combinations of types of paper and processing operations conducted
with respect to the sheets of paper. Such paths correspond to sizes
of paper to be discharged, application and non-application of the
stapling operation, necessity or non-necessity of reversing
feeding, types of the discharge trays, etc. In the sheet
post-processing device 1, desired paths are selected from among the
plurality of the paths and are combined so as to form one transport
route. The transport route refers to a route through which sheets
of paper supplied from the copying machine 2 are subject to desired
operations and thereafter discharged.
[0100] FIG. 2 is an explanatory view illustrating paths in the
sheet post-processing device 1. As shown in the figure, concretely,
the paths are a direct path 21, a detour path 22, a reversing path
23, a connecting path 24, an upper fixed tray discharge path 25, a
lower fixed tray discharge path 26, an offset tray discharge path
27, and a lower staple tray 15.
[0101] The direct path (direct transport path) 21 extends from the
feed-in opening 4 downward. It goes through reversing rollers 42
and reaches the gap G between the upper staple tray 14 and the
lower staple tray 15. As described above, the gap G is a sheet
passing opening through which sheets of paper are supplied to the
lower staple tray 15.
[0102] The detour path (detour transport path) 22 extends from the
feed-in opening 4 upward (detour path part 22a), and curves so as
to go around the upper edge of the staple tray 14. After curving,
it extends downward along a side wall of the sheet post-processing
device 1 on a side to the trays (detour path parts 22b, 22c), and
again curves before an upper portion of the offset tray 11 so as to
connect to the lower edge of the lower staple tray 15.
[0103] Thus, the whole detour path 22 from the feed-in opening 4 to
the lower edge of the lower staple tray 15 is divided into the
three parts, that is, the detour path parts 22a through 22c. From a
junction point of the detour path parts 22a and 22b, the upper
fixed tray discharge path 25 branches out. From a junction point of
the detour path parts 22b and 22c, the lower fixed tray discharge
path 26 branches out.
[0104] The upper fixed tray discharge path (second discharge
transport path) 25 is a path through which sheets of paper are
discharged onto the upper fixed tray 12. The lower fixed tray
discharge path (second discharge transport path) 26 is a path
through which sheets of paper are discharged onto the lower fixed
tray 13.
[0105] The reversing path (reversing transport path) 23 extends
substantially perpendicularly from a point at which the direct path
21 crosses the upper and lower staple trays 14 and 15 with the gap
G therebetween, in the vicinity of the reversing rollers 42, on a
side to the copying machine 2.
[0106] The reversing path 23 and the connecting path 24 are used in
the case where sheets of paper are sent to the detour path 22 by
switchback. More specifically, in this case, sheets of paper
transported through the direct path 21 are not sent to the lower
staple tray 15 but are transported to the reversing path 23. The
sheets introduced to the reversing path 23 are thereafter sent to
the connecting path 24 by rotation of the reversing rollers 42 in
the opposite directions, and then, sent to the detour path 22.
[0107] The offset tray discharge path (first discharge transport
path) 27 is substantially horizontally provided so as to go from
the lower edge of the lower staple tray 15 to below the detour path
22. Besides, sheets of paper sent from the lower edge of the lower
staple tray 15 are sent through the offset tray discharge path 27
so as to be discharged onto the offset tray 11.
[0108] Desired paths are selected from among the aforementioned
paths, depending on the operational mode of the copying machine 2,
the size of the sheets transported, and the like, and the transport
paths are switched in accordance with the foregoing selection. The
switch of the transport paths is realized by controlling
(switching) positions of gates respectively provided at junction
points of the paths and rotational directions of transport rollers.
Further, transport of paper along the paths is also carried out by
the transport rollers.
[0109] FIG. 3 is an explanatory view illustrating the transport
rollers provided in the sheet post-processing device 1. As shown in
this figure, feed-in rollers 41, the reversing rollers 42,
transport rollers 43, feed-out rollers 44 through 46, and a
plurality of transport rollers 47 are provided in the sheet
post-processing device 1.
[0110] The feed-in rollers 41 are positioned in the vicinity of the
feed-in opening 4 of the sheet post-processing device 1. The
feed-in rollers 41 are for transporting sheets supplied to the
feed-in opening 4 to the direct path 21.
[0111] The reversing rollers (a fed-in sheet transport destination
switching section, first switching rollers) 42 are disposed at ends
of the direct path 21 and the reversing path 23. The reversing
rollers 42 are arranged so that their rotational directions are
freely switched.
[0112] Non-reverse rotation of the reversing rollers 42 causes the
sheets of paper from the direct path 21 to be sent to either the
lower staple tray 15 or the reversing path 23. On the other hand,
reverse rotation of the reversing rollers 42 causes the sheets from
the reversing path 23 to be sent to the detour path 22 via the
connecting path 24.
[0113] The transport rollers (discharge section, discharge rollers)
43 are disposed at the lower edge of the staple tray 10, as shown
in FIG. 1. The transport rollers 43 are constituted by a driving
roller 43a to which a driving force of a motor is transmitted, and
two driven rollers 43b and 43c which rotate by contacting the
driving roller 43a.
[0114] The driving roller 43a and the driven roller 43b have a
function of sending the stack of paper from the staple tray 10 to
the offset tray discharge path 27. More specifically, in a
transporting operation, the rollers 43a and 43b rotate while
pressing the stack of paper P. The driving roller 43a and the
driven roller 43c has a function of sending sheets of paper
supplied from the detour path 22 into the staple tray 10.
[0115] The driven roller 43b is formed so as to be in contact with,
but separable from, the driving roller 43a. When the stack of paper
is moved to the stapler 59, the driven roller 43b is moved to a
predetermined recessional position so as not to obstacle the
movement of the stack of paper.
[0116] The feed-out rollers 44 through 46 are transport rollers
provided at ends of the offset tray discharge path 27, the upper
fixed tray discharge path 25, and the lower fixed tray discharge
path 26, respectively. The feed-out rollers 44 through 46 discharge
sheets of paper on the paths to the trays 11 through 13,
respectively.
[0117] The transport rollers 47 are provided for giving a
transporting force to the sheets in the detour path 22 and the
connecting path 24. They are appropriately provided at
predetermined intervals.
[0118] Note that the transport rollers other than the transport
rollers 43 are also composed of driving rollers to which a driving
force of a motor is transmitted and driven rollers which rotate by
contacting the driving rollers.
[0119] Among the transport rollers, the reversing rollers 42 rotate
in two directions, a non-reverse rotational direction and a reverse
rotational direction, while the other transport rollers rotate in
one direction. Therefore, it is preferable that a motor for driving
the reversing rollers 42 and a motor for driving the other rollers
are separately provided.
[0120] Therefore, as shown in FIG. 3, the sheet post-processing
device 1 has two motors, i.e., a reversing motor 60 and a transport
motor 61. The reversing motor (second driving system) 60 is a motor
for driving the reversing rollers 42 as shown in FIG. 3 or 4, that
is, for causing the reversing rollers 42 to rotate in the
non-reverse direction and the reverse direction.
[0121] The transport motor (first driving system) 61 is a motor for
driving the transport rollers other than the reversing rollers 42,
causing the transport rollers in one predetermined direction.
Besides, the transport motor 61 directly drives the driving roller
43a of the transport rollers 43, while the driving force is
transmitted to the other transport rollers through a belt and
pulleys.
[0122] As shown in FIG. 1, the sheet post-processing device 1 is
equipped with a feed-in gate 31, a reversing gate 32, a switching
gate 33, a switching gate 34, feed-out gates 35 and 36, and a
switching gate 37, as gates for switching the transport paths.
[0123] FIGS. 5(a) through 5(d) are explanatory views illustrating
arrangements and switching operations of the gates 31 through 33.
As made clear by the figures, the feed-in gate 31 is a gate just on
a downstream side to the feed-in rollers 41. The feed-in gate 31 is
provided of switching the path for sheets of paper fed by the
feed-in rollers 41, between the direct path 21 and the detour path
22.
[0124] The reversing gate 32 is a gate provided on an upstream side
to the reversing rollers 42. When the reversing rollers 42 rotate
in the non-reverse direction, the reversing gate 32 opens the
direct path 21 while closes the connecting path 24. On the other
hand, when the reversing rollers 42 rotates in the reverse
direction, the reversing gate 32 closes the direct path 21 while
opens the connecting path 24.
[0125] The switching gate (fed-in sheet transport destination
switching section, first switching gate) 33 is a gate provided just
on a downstream side to the reversing rollers 42. The switching
gate 33 is provided for switching the path for transport of sheets
of paper during non-reverse rotation of the reversing rollers 42,
between the lower staple tray 15 and the reversing path 23.
[0126] The switching gate (discharge section, third switching gate)
34 is provided on a downstream side to the lower staple tray 15.
The switching gate 34 is provided for switching the path of sheets
of paper stacked on the lower staple tray 15, between the offset
tray 11 and the offset tray discharge path 27.
[0127] The feed-out gate 35 is a gate provided in the detour path
22. The feed-out gate 35 is provided for switching the transport
path for sheets of paper supplied thereto through the detour path
22, depending on whether or not the sheets of paper are to be
discharged to the upper fixed tray 12. The feed-out gate 36 is
provided on a downstream side to the feed-out gate 35. The feed-out
gate 36 is provided for switching the transport path for sheets of
paper supplied thereto through the feed-out gate 35, depending on
whether or not the sheets of paper are to be discharged to the
lower fixed tray 13.
[0128] The following description will explain an operation of the
sheet post-processing device 1 in accordance with the operational
modes of the copying machine 2.
[0129] (Copy-mode Operations)
[0130] To start with, the following description will explain a case
where a stack of paper composed of a predetermined number of sheets
of paper is formed when the copying machine 2 is in the copy mode
and the stack of paper is fed out after being stapled.
[0131] When a stapling operation is applied, in the sheet
post-processing device 1, the operation applied to the sheets and
the transporting path selected are different depending on whether
or not the size of the paper is greater than the letter size (A4
size, width:length=210 mm:297 mm).
[0132] First of all, the operation and the transport path of the
sheet post-processing device 1 in the case where the paper size is
equal to or smaller than the letter size will be explained. The
transport path in this case takes the following route in FIG. 2:
the direct path 21--the staple tray 10 (only the lower staple tray
15)--the offset tray discharge path 27--the offset tray 11. In this
case, the feed-in gate 31, the reversing gate 32, and the switching
gate 33 are turned as shown in FIG. 5(a).
[0133] Sheets of paper discharged from the feed-out opening 3 of
the copying machine 2 are fed through the feed-in opening 4 into
the sheet post-processing device 1, and are transported to the
direct path 21 inside the sheet post-processing device 1 by the
feed-in rollers 41. Thereafter, the sheets transported through the
direct path 21 pass through the gap G of the staple tray 10, guided
by the reversing rollers 42 rotating in the non-reverse direction
and the switching gate 33. Then, as shown in FIG. 6(a), sheets of
paper are subsequently stacked on the lower staple tray 15,
entering therein through the upper end of the lower staple tray 15.
Thus, a stack of paper P is formed.
[0134] Here, since the size thereof is smaller than the letter
size, the sheets of paper do not project out of the lower staple
tray 15. Besides, as shown in the figure, when the sheets are
stacked, the switching gate 34 is turned to such a position that
the stack of paper P are sent to the stapler 59.
[0135] Then, when the stack of paper P composed of the
predetermined number of sheets of paper is thus formed on the sheet
supporter 55, the sheet supporter 55 causes the stack of paper P to
lower to the stapling position, as shown in FIG. 6(b). Then, as
guided by the switching gate 34, the stack of paper P is moved to
the stapler 59, where the stapling operation is applied to the
stack of paper P.
[0136] When the stapling operation by the stapler 59 finishes, the
sheet supporter 55 rises as shown in FIG. 6(c), so that the stack
of paper P is returned to a recessional position higher than the
switching gate 34. Thereafter, the switching gate 34 is turned to
such a position that the sheets of paper are discharged to the
offset tray discharge path 27.
[0137] Then, as shown in FIG. 6(d), the sheet supporter 55 lowers,
and the stack of paper P is transported to the offset tray
discharge path 27, guided by the switching gate 34. In the
transporting operation, the transport rollers 43 on the upstream
side to the switching gate 34 rotate while pressing the stack of
paper P. Thereafter the stack of paper P is fed out to the offset
tray 11 through the offset tray discharge path 27 by the feed-out
roller 44.
[0138] The following description will explain the operation and
transport path of the sheet post-processing device 1 in the case
where the paper size is greater than the letter size. The transport
path in this case takes the following route, in FIG. 2: the direct
path 21--the reversing path 23--the connecting path 24--the detour
path 22--the staple tray 10 (the upper staple tray 14 and the lower
staple tray 15)--the offset tray discharge path 27--the offset tray
11. Further, in this case, the feed-in gate 31, the reversing gate
32, and the switching gate 33 are turned as shown in FIG. 5(b).
[0139] Sheets of paper fed out of the feed-out opening 3 of the
copying machine 2 are fed into the sheet post-processing device 1
through the feed-in opening 4, and the sheets are sent to the
direct path 21 inside the sheet post-processing device 1, by the
feed-in rollers 41. Thereafter, the sheets transported through the
direct path 21 are sent to the reversing path 23, guided by the
reversing rollers 42 rotating in the non-reverse direction and by
the switching gate 33.
[0140] Then, when a rear edge of each sheet transported through the
reversing path 23 passes the reversing gate 32, the reversing gate
32 is turned as shown in FIG. 5(c). At the switching operation,
simultaneously the rotational direction of the reversing rollers 42
is switched to the reverse direction. With these switching
operations, the sheets are sent from the reversing path 23 to the
detour path 22. Note that the rear edge of the sheet means an edge
which is rear when the sheet is discharged from the copying machine
2.
[0141] Thus, in the case where the size of the paper is great, the
sheets of the paper fed from the copying machine 2 are once
switched back by using the reversing path 23, and the sheets are
sent through the connecting path 24 to the detour path 22, with the
rear edge going in front.
[0142] The sheets of paper sent to the detour path 22 pass the
whole detour path 22, thereby being sent to the staple tray 10
through the lower end thereof, and are stacked therein. In this
operation, the driving roller 43a and the driven roller 43c of the
transport rollers 43 are used. Since the paper is greater than the
letter size, the sheets of paper stacked in the staple tray 10 are
supported by the upper staple tray 10 and the lower staple tray 15
both.
[0143] Incidentally, since the operation after the sheets of paper
are stacked in the staple tray 10 is the same as that in the case
where the paper size is smaller than the letter size, the
description thereof is omitted.
[0144] As described above, in the case where the paper size is
greater than the letter size, the direct path 21 and the gap G are
not used but the detour path 22 is used, for the following
reason.
[0145] More specifically, if the sheets of paper are sent through
the direct path 21 to the staple tray 10, jamming occurs in the
direct path 21. The reason is that since the sheet of paper is too
long in the transport direction, the following occurs if the sheet
of paper is fed through the gap G: the rear edge of the sheet of
paper does not yet pass through the gap G when the front edge
thereof reaches the sheet supporter 55. Therefore, in this case,
the sheets of paper are sent to the staple tray 10 through the
detour path 22.
[0146] The reason why switchback is performed by using the
reversing path 23 before sending the sheets to the detour path 22
is as follows. In the copy mode, the sheets are sent from the
copying machine 2 from the last page of the sheets. Therefore, in
the case where the stapling operation is applied to the sheets of
paper, the sheets are preferably stacked in a "face-up" state on
the staple tray 10. The "face-up" state means a state in which
image-formed surfaces thereof face an opposite side to the staple
tray 10.
[0147] However, if the sheets of paper fed out of the copying
machine 2 are sent directly to the staple tray 10 through the
detour path 22, the sheets are stacked in a "face-down" state.
Therefore, before sending the sheets to the detour path 22,
switchback is performed by using the reversing path 23 so that the
sheets ate stacked on the staple tray 10 in the face-up state.
[0148] Next, a case where the sheets are fed out without
application of the stapling operation when the copying machine 2 is
in the copy mode will be explained below.
[0149] In this case, the transport path takes the following route
in FIG. 2, irrespective of the paper size: the direct path 21--the
staple tray 10 (only the lower staple tray 15)--the offset tray
discharge path 27--the offset tray 11.
[0150] More specifically, in this case, the sheets transported from
the copying machine 2 are discharged onto the offset tray 11 one by
one, without being stacked by the lower staple tray 15. Therefore,
the sheet supporter 55 is kept at the lower position. The switching
gate 34 is kept at such a position that the sheets are sent to the
offset tray discharge path 27, that is, the position shown in FIG.
6(d).
[0151] (Facsimile-mode and Print-mode Operations)
[0152] The following description will explain operations and
transport paths when the copying machine 2 is in the facsimile mode
or in the print mode.
[0153] First of all, the following description will explain a case
where the stapling operation is not applied to the sheets of paper.
Incidentally, in such a case, the sheets fed out of the sheet
post-processing device 1 are discharged onto the upper fixed tray
12 in the case of the facsimile mode, while onto the lower fixed
tray 13 in the case of the print mode.
[0154] As described above, since the sheets of paper are fed out
from the last page when the copying machine 2 is in the copy mode,
the sheets are discharged onto the offset tray 11 in the face-up
state. On the other hand, when the copying machine 2 is in the
facsimile mode or the print mode, the sheets are fed out of the
copying machine 2 from the top page. Therefore, in such a case, if
the sheets of paper are fed out of the sheet post-processing device
1 in the face-up state, the order of pages is reverse on the tray
12 or 13.
[0155] Therefore, in the facsimile mode or the print mode, the
sheets are switched back once before being discharged onto the tray
12 or 13, so that the sheets are discharged in the face-down
state.
[0156] More specifically, in the case where the stapling operation
is not applied to the sheets of paper in the case of the facsimile
mode, the transport path takes the following route in FIG. 2: the
direct path 21--the reversing path 23--the connecting path 24--the
detour path part 22a--the upper fixed tray discharge path 25--the
upper fixed tray 12. Further, in the case of the print mode, the
transport path takes the following route in FIG. 2: the direct path
21--the reversing path 23--the connecting path 24--the detour path
part 22a--the detour path part 22b--the lower fixed tray discharge
path 26--the lower fixed tray 13.
[0157] Thus, in the case of the facsimile mode or the print mode,
the sheets of paper fed from the copying machine 2 are once sent to
the reversing path 23 so as to make a switchback, and thereafter,
they are sent to the detour path 22. Incidentally, the operation
for switchback is the same as that in the case where the stapling
operation is applied to the sheets of paper greater than the letter
size when the copying machine 2 is in the copy mode.
[0158] The sheets of paper sent to the detour path 22 are
discharged halfway the detour path 22 onto the upper fixed tray 12
or the lower fixed tray 13. More specifically, in the case of the
facsimile mode, the feed-out gate 35 is turned so that the sheets
are supplied from the detour path 22 to the upper fixed tray
discharge path 25, thereby being fed out onto the upper fixed tray
12 by the feed-out rollers 45. On the other hand, in the case of
the print mode, the sheets are supplied from the detour path 22 to
the lower fixed tray discharge path 26 by the switching of the
feed-out gate 36, thereby being discharged onto the lower fixed
tray 13 by the feed-out rollers 46.
[0159] Next, a case where the stapling operation is applied to the
sheets of paper will be explained below.
[0160] As described above, in this case as well, the printing and
feeding-out operations are applied to the sheets of paper from the
top sheet thereamong in the copying machine 2, and therefore, it is
preferable that the sheets are stacked on the staple tray 10 in the
facedown state.
[0161] For this reason, the sheets are directly sent to the detour
path 22 through the feed-in opening 4, irrespective of the paper
size, and are transported to the staple tray 10. This is because
that the sheets cannot be stacked in the face-down state if the
sheets are directly sent to the staple tray 15 through the direct
path 21.
[0162] Therefore, the transport path in this case takes the
following route in FIG. 2: the detour path 22--the staple tray 10
(only the lower staple tray 15, or both the upper and lower staple
trays 14 and 15)--the offset tray discharge path 27--the offset
tray 11. Further, in this case, the feed-in gate 31 is turned as
shown in FIG. 5(d).
[0163] Incidentally, an operation after the sheets of paper are
sent to the detour path 22 and then to the staple tray 10, and are
discharged to the offset tray 11 after being stapled, is the same
as that in the case where the sheets of paper greater than the
letter size are stapled in the case of the copy mode.
[0164] Next, the following description will explain a case where
the copying machine 2 has a large-capacity memory and is therefore
capable of storing image data of the whole pages in the memory and
hence printing and feeding out from the last page.
[0165] In this case, the transport path in the case where the
stapling operation is performed takes the same route as that in the
case of the copy mode. Therefore, if the paper size is not greater
than the letter size, the transport path takes the following route:
the direct path 21--the staple tray 10 (only the lower staple tray
15)--the offset tray discharge path 27--the offset tray 11.
[0166] On the other hand, if the paper size is not smaller than the
letter size, the transport path takes the following route: the
direct path 21--the reversing path 23--the connecting path 24--the
detour path 22--the staple tray 10 (the upper and lower staple
trays 14 and 15)--the offset tray discharge path 27--the offset
tray 11. Besides, the switching actions of the rollers and gates
are the same as those in the case of the copy mode.
[0167] Further, in this case, even if the stapling operation is not
performed, switchback of the sheets of paper is unnecessary.
Therefore, the feed-in gate 31 is turned as shown in FIG. 5(d). The
sheets supplied from the copying machine 2 are sent directly to the
detour path 22 through the feed-in opening 4 without passing the
reversing path 23, and thereafter, the sheets are discharged onto
the upper fixed tray 12 or the lower fixed tray 13.
[0168] Incidentally, even if the copying machine 2 has a memory,
the image data to be stored in the memory may exceed the capacity
of the memory. In such a case, the copying machine 2 feeds out the
sheets from the top page, and accordingly the operation of the
sheet post-processing device 1 is the same as that in the case
where the copying machine 2 does not have a memory.
[0169] As described above, the sheet post-processing device 1 in
accordance with the present embodiment is arranged so that sheets
of paper fed out from the copying machine 2 are stacked on the
staple tray 10, and the sheets thus stacked are discharged after
the stapling operation is applied thereto. Further, in the sheet
post-processing device 1, the feed-in opening 4 and the staple tray
10 are formed so that the feed-in opening 4 is at a position not
lower than the lower edge of the staple tray 10 and not higher than
the upper edge of the staple tray 10.
[0170] More specifically, the staple tray 10 is composed of the
upper staple tray 14 and the lower staple tray 15, and the upper
staple tray 14 is disposed above the feed-in opening 4 while the
lower staple tray 15 is disposed below the feed-in opening 4.
[0171] Consequently, the positions of the staple tray 10 and the
feed-in opening 4 in the sheet post-processing device 1 are less
limited.
[0172] Further, it is possible to dispose the staple tray 10 in the
vicinity of the upper part of the sheet post-processing device 1.
Therefore, if the sheets of paper fed out of the staple tray 10 are
discharged outside without bringing up, the offset tray 11 as the
destination of the discharge can be positioned sufficiently high.
As a result, the offset tray 11 is made to have a sufficient
capacity.
[0173] Furthermore, inside the sheet post-processing device 1, the
staple tray 10 is substantially perpendicularly disposed. With this
arrangement, the width of the sheet post-processing device 1 can be
reduced.
[0174] Furthermore, upon transport of sheets of paper to the staple
tray 10, the direct path 21 and the detour path 22 are used. The
detour path 22 goes around the upper edge of the upper staple tray
14 and is connected with the lower edge of the lower staple tray
15.
[0175] By so doing, even in the case where the width in the sheet
transport direction of the sheet post-processing device 1 is set
smaller, a radius of curvature of the curving part of the detour
path 22 can be set sufficiently great. Therefore, the sheet
post-processing device 1 is made to occupy a small space while to
be capable of stable transport and post-processing operation with
respect to a great number of sheets of paper.
[0176] Further, the sheet post-processing device 1 is equipped with
three trays, namely, the offset tray 11, the upper fixed tray 12,
and the lower fixed tray 13. Sheets of paper are supplied to upper
fixed tray 12 through the upper fixed tray discharge path 25, to
the lower fixed tray 13 through the lower fixed tray discharge path
26, and to the offset tray 11 through the offset tray discharge
path 27, respectively.
[0177] With this arrangement, the sheet post-processing device 1
ensures that one is appropriately selected and used from among the
trays 11 through 13 according to the operational mode of the
copying machine 2.
[0178] Further, the upper fixed tray discharge path 25 and the
lower fixed tray discharge path 26 are provided at the upper part
of the sheet post-processing device 1, forming paths branching out
from the detour path 22. Therefore, spaces for discrete paths to
the trays 12 and 13 are unnecessary.
[0179] Therefore, the trays 12 and 13 can be provided at as upper
positions as possible in the sheet post-processing device 1.
Furthermore, this enables to provide the offset tray 11 at an upper
position as well. Therefore, the capacity of the offset tray 11 can
be made further greater.
[0180] Furthermore, the offset tray discharge path 27 is provided
in a lower part of the sheet post-processing device 1, forming a
path extending from the lower edge of the lower staple tray 15 to
the offset tray 11. Therefore, since there is no need to bring up
sheets of paper upward, the driving system including the transport
rollers for discharging the sheets to the offset tray 11 can be
made simpler.
[0181] Furthermore, the sheet post-processing device 1 is equipped
with a reversing path 23 for sending the sheets of paper to the
detour path 22 after reversion (switchback). The reversing path 23
is substantially perpendicularly formed between the lower staple
tray 15 and the feed-in opening 4. The reversing path 23 is formed
so that an upper part thereof and a lower part of the detour path
part 22a substantially fall on one straight line.
[0182] Thus, since the reversing path 23 is perpendicularly formed,
it is possible to suppress an increase in the width of the sheet
post-processing device 1 even in the case where the reversing path
23 is disposed in the sheet post-processing device 1. Besides,
since the upper part of the reversing path 23 and the lower part of
the detour path part 22a are substantially on one straight line,
transport jamming scarcely occurs upon reversion (switchback) of
the sheets of paper.
[0183] Furthermore, the sheet post-processing device 1 includes the
direct path 21 for sending the sheets of paper supplied from the
feed-in opening 4 directly to the staple tray 10 without using the
detour path 22. Further, the gap G is provided between the upper
staple tray 14 and the lower staple tray 15 which compose the
staple tray 10. The gap G serves as a sheet passing opening for
guiding the sheets of paper thus transported through the direct
path 21 toward the sheet-carrying surface of the staple tray
10.
[0184] By so doing, sheets of small-size paper (not greater than
the letter size in the present embodiment) or sheets of paper to
which the stapling operation is not applied are discharged onto the
offset tray 11 without using the detour path 22, i.e., through a
shorter transport path.
[0185] Furthermore, a time since a copying operation starts till
the first sheet of paper is discharged, that is, a time for the
first copy, can be shortened. Moreover, since the sheets of paper
can be transported without going through the detour path 22 which
curves, it is possible to reduce the occurrence of transport
jamming.
[0186] Incidentally, in the sheet post-processing device 1, to
guide the sheets of paper transported through the direct path 21 to
the reversing path 23 or the lower staple tray 15, the switching
gate 33 shown in FIGS. 5(a) through 5(d). However, in the place of
the switching gate 33 and the reversing rollers 42, reversing
rollers (second reversing rollers) 48 and a switching gate (second
switching gate) 37 may be provided as the fed-in sheet transport
destination switching section.
[0187] FIGS. 7(a) through 7(d) are explanatory views illustrating
an arrangement and operations of the reversing rollers 48 and the
switching gate 37. As shown in the figures, the reversing rollers
48 are three rollers associated with each other, namely, a driving
roller 48a and driven rollers 48b and 48c (first and second driven
rollers). The switching gate 37 is a gate provided on an upstream
side to the reversing rollers 48, or more specifically, between the
reversing gate 32 and the reversing rollers 48.
[0188] With the foregoing arrangement, the sheets supplied through
the direct path 21 are guided by the switching gate 37 either to
the reversing path 23 or to the lower staple tray 15.
[0189] In the case where the sheets are sent from the direct path
21 to the lower staple tray 15 in the foregoing arrangement, the
feed-in gate 31, the reversing gate 32, and the switching gate 37
are turned as shown in FIG. 7(a).
[0190] In the case where the sheets are sent from the direct path
21 to the reversing path 23, the feed-in gate 31, the reversing
gate 32, and the switching gate 37 are turned as shown in FIG.
7(b).
[0191] Then, in the case where the sheets supplied to the reversing
path 23 are reversed and sent to the detour path 22, the reversing
gate 32 is turned as shown in FIG. 7(c). Furthermore, in the case
where the sheets are directly sent to the detour path 22, the
feed-in gate 31 is turned as shown in FIG. 7(d).
[0192] Thus, according to the arrangement shown in FIGS. 7(a)
through 7(d), the reversing rollers 48, that are the three
associated rollers, serve as both (1) the pair of rollers which are
capable of rotating both in non-reversal and reversal directions
for feeding sheets of paper into and out of the reversing path 23,
and (2) the pair of transport rollers for transporting sheets of
paper to the gap G as the sheet passing opening of the staple tray
10.
[0193] With the foregoing arrangement, the reversing path 23 and
the gap G can be disposed close to each other. Therefore, with the
foregoing arrangement, an increase in the width of the sheet
post-processing device 1 in the sheet transport direction can be
suppressed.
[0194] Furthermore, regarding the arrangement shown in FIGS. 7(a)
through 7(d), it is preferable that the reversing rollers 48 are
solely driven by the reversing motor 60, like the reversing rollers
42 shown in FIG. 3 and the like. Besides, regarding the foregoing
arrangement, it is preferable that all the other rollers are driven
by the transport motor 61. By such arrangement, the driving system
of the transport rollers can be simplified.
[0195] Furthermore, in the sheet post-processing device 1, to guide
the sheets of paper transported through the direct path 21 either
to the reversing path 23 or to the lower staple tray 15, there is
no need to use the switching gate 33, the switching gate 37, or the
like. Alternatively, the arrangement shown in FIGS. 7(a) through
7(d) may be modified so that an inclining angle of the reversing
path 23 and the lower staple tray 15 is changeable (the reversing
path 23 and the lower staple tray 15 can be inclined).
[0196] FIGS. 8(a) and 8(b) are explanatory views showing operations
in the foregoing arrangement. With the foregoing arrangement, in
the case where sheets of paper are sent from the direct path 21 to
the lower staple tray 15, the upper edge of the lower staple tray
15 is caused to come right below the reversing rollers 42, as shown
in FIG. 8(a).
[0197] On the other hand, in the case where sheets of paper are
sent from the direct path 21 to the reversing path 23, or from the
reversing path 23 to the detour path 22, the inclining angles of
the reversing path 23 and the lower staple tray 15 are changed so
that the upper end of the reversing path 23 is caused to come right
below the reversing rollers 42, as shown in FIG. 8(b).
[0198] Incidentally, with the foregoing arrangement, the actions of
the feed-in gate 31 and the reversing gate 32 are completely the
same as those shown in FIGS. 5(a) through 5(d).
[0199] With the foregoing arrangement, in the case where the sheets
of paper are guided from the direct path 21 to the lower staple
tray 15, the lower staple tray 15 is pivoted, and in so doing, a
space on the sheet-carrying surface side of the lower staple tray
15 is made larger, whereby the stacking capacity of the lower
staple tray 15 can be expanded.
[0200] Incidentally, with the arrangement shown in FIGS. 8(a)
through 8(b), the reversing path 23 and the lower staple tray 15
may be provided in a unit including the stapler 59 and the offset
tray discharge path 27 as well.
[0201] Furthermore, according to the arrangement shown in FIGS.
8(a) through 8(b), to change the inclining angles of the reversing
path 23 and the lower staple tray 15, the whole unit is revolved
around the discharge rollers 44 as an axis of revolution. However,
inclining angles of only the reversing path 23 and the lower staple
tray may be changeable.
[0202] According to the present embodiment, in the case where the
stapling operation is not applied to sheets of paper, used as the
discharge tray is the offset tray 11 in the case of the copy mode,
the upper fixed tray 12 in the case of the facsimile mode, and the
lower fixed tray 13 in the case of the print mode, but the
combinations of the mode and the discharge tray are not limited to
them. The combination of the mode and the discharge tray may be
desirably set by the user.
[0203] Furthermore, the staple tray 10 of the sheet post-processing
device 1 may be formed so as to perpendicularly extend.
[0204] Furthermore, the reversing path 23 may be formed so that a
junction part thereof with the detour path 22 becomes substantially
straight. By this arrangement, transport jamming of sheets of paper
during the reversing operation scarcely occurs.
[0205] Furthermore, the arrangement of the sheet post-processing
device 1 in accordance with the present embodiment is merely one
example of the arrangement of the sheet post-processing device of
the present invention. The present invention is applicable to the
following various sheet post-processing devices.
[0206] For example, in the sheet post-processing device 1 shown in
FIG. 1, the staple tray 10 divided into two trays, namely, the
upper fixed tray 12 and the lower fixed tray 13, is used as the
post-processing tray. However, the arrangement of the sheet
post-processing device 1 is not limited to this. For example, as
shown in FIG. 9, a staple tray 16 which is hot divided may be used
as the post-processing tray. In this arrangement, the direct path
21 is unnecessary.
[0207] In the sheet post-processing device 1 shown in FIG. 1,
sheets of paper are supplied through the detour path 22 going
around the upper edge of the staple tray 10, so that the sheets are
supplied to the staple tray 10 from the lower edge side. However,
the arrangement of the sheet post-processing device 1 is not
limited to this. For example, as shown in FIG. 10, the detour path
22 may go around an edge of the staple tray 10 or 16 so that sheets
of paper are supplied to the staple tray 10 or 16 through the edge
(upper edge) of the staple tray 10 or 16 that the detour path 22
goes around.
[0208] Furthermore, in the sheet post-processing device 1 shown in
FIG. 1, the staple tray 10 is substantially perpendicularly
provided inside the sheet post-processing device 1, but the
provision of the staple tray 1 is not limited to this. The staple
tray 10 is preferably provided in the sheet post-processing device
1 with such an inclination that a length of the staple tray 10
projected on a vertical plane (a plane whose normal line is
directed in the horizontal direction) is greater than a length of
the staple tray 10 projected on a horizontal plane. In other words,
the staple tray 10 is disposed so that a vertical direction
component of the length of the staple tray 10 is greater than a
horizontal direction component thereof. By so disposing the staple
tray 10, the width of the sheet post-processing device 1 in the
horizontal direction can be reduced.
[0209] Furthermore, for example, as shown in FIGS. 11 through 13,
the staple tray 10 or 16 may be inclined so that the length of the
staple tray 10 or 16 projected on the horizontal plane is greater
than the length thereof projected on the vertical plane.
[0210] Furthermore, as shown in FIG. 14, the sheet post-processing
device 1 may be arranged so that instead of the detour path 22, a
feed-in path 29 may be provided as the path for transporting sheets
of paper to the staple tray 10 or 16. As shown in the figure, the
feed-in path 29 does not go around an edge of the staple tray 10 or
16.
[0211] However, note that with the foregoing arrangement, if the
staple tray 10 or 16 is nearly perpendicularly disposed, a radius
of curvature of the curving part of the feed-in path 29 becomes
small. For this reason, with the foregoing arrangement, the staple
tray 10 or 16 is preferably disposed with a certain
inclination.
[0212] Furthermore, as shown in FIG. 14 also, the sheet
post-processing device 1 may be provided so as to feed out sheets
of paper through the upper edge of the staple tray 10 or 16.
[0213] According to the arrangements as shown in FIGS. 9 through 13
wherein stapled sheets of paper are fed out through the lower edge
of the staple tray 10 or 16, the offset tray 11 on which the
stapled sheets are discharged can be made to have a sufficient
capacity, without setting the sheet feed-out opening of the copying
machine 2 to a high position in the copying machine 2.
[0214] Furthermore, with the arrangement as shown in FIG. 14
wherein stapled sheets of paper are discharged through the upper
edge of the staple tray 10 or 16, instability of the device due to
the provision of the staple tray 10 or 16 at a high position can be
reduced, without setting the feed-out opening 3 of the copying
machine 2 at a lower position.
[0215] Thus, the sheet post-processing device 1 as shown in FIGS. 9
through 14 is made flexible with the height of the feed-out opening
3 of the copying machine 2. Further, the sheet post-processing
device 1 is arranged so that the dimensions in the horizontal
direction and in the vertical direction can be reduced.
[0216] [Second Embodiment]
[0217] The following description will explain a second embodiment
of the present invention. The members having the same structure
(function) as those in the first embodiment will be designated by
the same reference numerals and their description will be
omitted.
[0218] The following description about the present embodiment will
explain a system (stapling system) for performing the stapling
operation by he sheet post-processing device 1 shown in FIG. 1. The
arrangement and function of the stapling system is explained in the
description of the first embodiment, and the following description
of the present embodiment will further explain the same in more
detail.
[0219] First of all, the arrangement of the stapling system is
explained below. FIG. 15 is a side view of the stapling system, and
FIG. 16 is a front view of the same. As shown in these figures, the
lower staple tray 15 is equipped with the sheet supporter (sheet
carrying member) 55, the paddler 56, and the adjusting plates
(sheet adjusting members) 57. Then, the sheet supporter 55 and the
adjusting plates 57 are provided to the lower staple tray 15 so
that each of the same can be slid along the lower staple tray
15.
[0220] The sheet supporter 55 is for adjusting the lower edge of
stacked sheets of paper. The sheet supporter 55, in a state of
carrying the stack of paper, is movable in an arrow A direction in
the figure to a stacking position, a stapling position
(post-processing position), a recessional position, and a discharge
position which are predetermined, in order to move the stack of
paper carried thereon to these positions.
[0221] The stacking position is a position at which sheets of paper
are stacked by the lower staple tray 15. The stapling position is a
position at which sheets of paper are stapled by the stapler
59.
[0222] The recessional position is a position to which stapled
sheets of paper are moved after the stapling operation, and which
is determined so that the stack of paper is positioned higher than
the switching gate 34. The discharge position is a position of the
stack of paper to be discharged onto the offset tray 11.
[0223] More specifically, when a predetermined sheets of paper are
stacked on the sheet supporter 55 at the stacking position, the
sheet supporter 55 is brought down to the stapling position at
which the stack of paper is stapled by the stapler 59. After the
stapling operation by the stapler 59, the sheet supporter 55 is
brought up to the recessional position.
[0224] As shown in FIGS. 15 and 17, the sheet supporter 55 is
composed of a sheet carrying part 55a and a interfitting part 55b.
The interfitting part 55b interfits in a groove 15a formed in a
vertical direction (indicated by the arrow A) in the lower staple
tray 15. The interfitting part 55b slides along the groove 15a, so
that the sheet supporter 55 moves in the A direction along the
lower staple tray 15.
[0225] The sheet carrying part 55a is for supporting lower edges of
the sheets, and has a cross section in a substantially angular-U
shape. A surface of the sheet carrying part 55a which is in contact
with the lower edges of sheets of paper is flat. By bringing the
lower edges of sheets of paper in contact with the flat surface,
the lower edges of the sheets are adjusted.
[0226] The paddler 56 is for supplying sheets of paper on the lower
staple tray 15 with a transport force in a downward direction so as
to facilitate the adjustment of the lower edges of the sheets of
paper by the sheet supporter 55.
[0227] More specifically, the paddler 56 is arranged so as to make
one full rotation in an arrow C direction in FIG. 15 every time one
sheet is transported to the lower staple tray 15. With the
rotation, the transport force in the downward direction is supplied
to the sheets of paper, whereby the sheets are surely adjusted on
the sheet supporter 55. This prevents the sheets of paper from
becoming untidy on the sheet supporter 55 due to static electricity
or the like.
[0228] The paddler 56 is equipped with blade sections for supplying
the sheets of paper with a transport force. Examples of material
for the blade sections include a flexible material made of an
elastic substance such as rubber.
[0229] Incidentally, by making the sheet supporter 55 of a
conductive material and grounding it so that charge accumulated in
the sheets of paper is discharged, a further better result of
adjustment can be obtained.
[0230] The adjusting plates 57 are for adjusting side edges of the
sheets of paper stacked, and are shaped so as to be symmetrical.
Before the sheets of paper are stacked, the adjusting plates 57 are
positioned so that a space therebetween is widest. When a
predetermined number of sheets are stacked on the lower staple tray
15, the adjusting plates 57 are moved in an arrow B direction in
FIG. 16 in such a manner that the space therebetween becomes
narrower. Then, by closing the adjusting plates 57 to the sheets of
paper with the foregoing movement, the side edges are adjusted.
[0231] Each adjusting plate 57 is composed of a sheet platen 57a
and a sheet guide part 57b. The sheet platen 57a includes a part
interfitted in a groove 15b formed in a horizontal direction (the
arrow B direction in FIG. 16) in the lower staple tray 15. The
sheet platen 57a slides along the groove 15b so that the adjusting
plate 57 moves in the arrow B direction.
[0232] The sheet guide part 57b is for guiding the sheets of paper
supplied to the lower staple tray 15 to the sheet carrying part 55a
of the sheet supporter 55, and has a cross section in a
substantially L shape. Further, a surface of the sheet guide part
57b in contact with the side edges of sheets is flat. Therefore, by
bringing the side edges of sheets of paper in contact with the
foregoing surface, the side edges are adjusted. The sheet guide
part 57b also has a function of keeping sheets stacked on the
staple tray 10 from falling down.
[0233] Below the lower staple tray 15, the stapler 59 is disposed.
The stapler 59 is movable in the arrow B direction in FIG. 16 along
the lower edge of the stack of paper, thereby allowing the stapling
operation to be applied with respect to any desired position of the
lower edge part of the stack of paper. Needless to say, it is
possible to apply the stapling operation with respect to a
plurality of positions of the lower edge part of the stack of paper
by moving the stapler 59.
[0234] In the vicinity of the lower edge of the lower staple tray
15, the switching gate 34 is disposed. The switching gate 34 is a
gate used for switching a destination of the stack of paper between
the stapler 59 and the offset tray 11, when the sheet supporter 55
is brought down.
[0235] As shown in FIG. 16, the switching gate 34 is formed in a
comb shape, composed a rotation shaft 34a to which a plurality of
gate plates 34b in a thin film form each are fixed. The lower
staple tray 15 and the sheet supporter 55 have slits or the like so
as not to interfere with the gate plates 34b.
[0236] In the vicinity of the switching gate 34, the transport
rollers 43 composed of the driving rollers 43a and the driven
rollers 43b. The driving rollers 43a and the driven rollers 43b are
transport rollers for causing the stack of paper brought down
together with the sheet supporter 55 to be fed out onto the offset
tray 11 through the offset tray discharge path 27. In other words
the driving rollers 43a and the driven rollers 43b are for
supplying the transport force to the stack of paper, upon discharge
of the stack of paper onto the offset tray 11.
[0237] Moreover, the driven rollers 43b are movably provided so as
to be brought into contact with and be separated away from the
sheets of paper stacked on the lower staple tray 15 under control
of a solenoid 62 shown in FIG. 15. The driven rollers 43b are
positioned at predetermined recessional positions, all the times
except a stack of paper is discharged onto the offset tray 11.
Therefore, when the sheet supporter 55 moves a stack of paper, the
driven rollers 43b by no means obstruct the movement of the stack
of paper.
[0238] The following description will explain an operation of the
stapling system arranged as above. Incidentally, in the following
description, a case where the copying machine 2 is in the copy mode
and the paper size is not greater than the letter size will be
explained. Note that in the other cases, the operation that the
stapling system performs after a stack of paper P is obtained in
the staple tray 10 is identical to the operation in the present
case.
[0239] The transport path in this case is as follows in FIG. 2: the
direct path 21--the staple tray 10 (only the lower staple tray
15)--the offset tray discharge path 27--the offset tray 11. In the
foregoing case, the feed-in gate 31, the reversing gate 32, and the
switching gate 33 are turned as shown in FIG. 5(a).
[0240] Sheets of paper ejected from the feed-out opening 3 of the
copying machine 2 are fed into the sheet post-processing device 1
through the feed-in opening 4, and then, the sheets are sent to the
direct path 21 inside the sheet post-processing device 1.
Thereafter, the sheets transported through the direct path 21 pass
the gap G of the staple tray 10, guided by the reversing rollers 42
rotating in the non-reverse direction and the switching gate
33.
[0241] Then, as shown in FIG. 17(a), the sheets are supplied to the
lower staple tray 15 via the upper edge thereof and are stacked
thereon. Here, since the size is not greater than the letter size,
the sheets of paper by no means project out of the lower staple
tray 15. Besides, the sheet supporter 55 is at such a position that
the sheet carrying part 55a is positioned at a height substantially
equal to that of the lower edge of the lower staple tray 15. Such a
position is the stacking position of the sheet supporter 55. Here,
the switching gate 34 is turned to such a position that the stack
of paper P is sent toward the stapler 59.
[0242] Thus, sheets of paper supplied from the copying machine 2
are stacked, whereby a stack of paper P composed of a predetermined
number of sheets of paper is formed on the sheet supporter 55, as
shown in FIG. 17(b). The stack of paper P is subject to an
adjusting operation by the adjusting plates 57 whereby the side
edges of the stack of paper P are adjusted.
[0243] Thereafter, as shown in FIG. 17(c), the sheet supporter 55
descends, and the lower edge of the stack of paper P reaches to a
staple opening of the stapler 59, guided by the switching gate 34.
Then, as shown in FIG. 18(a), the stapling operation is applied to
the lower edge part of the stack of paper P by the stapler 59. The
foregoing position of the stack of paper P is the stapling
position.
[0244] After the stapling operation of the stapler 59 finishes, the
sheet supporter 55 rises, and as shown in FIG. 18(b), the stack of
paper P is returned to a position higher than the switching gate
34. The foregoing position of the stack of paper P is the
recessional position. The recessional position is a preferable
position of the stack of paper P when the switching gate 34 is
being turned.
[0245] Thereafter, as shown in FIG. 18(c), the switching gate 34 is
turned to such a position that the sheets of paper are sent to the
offset tray discharge path 27. Then, in this state, the sheet
supporter 55 descends and the stack of paper P stops on the
switching gate 34, as shown in FIG. 19(a). The position of the
stack of paper P stopping on the switching gate 34 is the discharge
position of the stack of paper P. When the sheet supporter 55
descends, the end portion of the switching gate 34 passes through
slits 55c (see FIG. 16) provided on the sheet supporter 55. By so
doing, the stack of paper P is surely stopped on the switching gate
34.
[0246] Thereafter, as shown in FIG. 19(b), the solenoid 62 is
turned on and causes the driving rollers 43a to press the driven
rollers 43b, whereby the stack of paper P is caught between the
rollers 43a and 43b.
[0247] Then, as shown in FIG. 19(c), the rollers 43a and 43b rotate
while pressing the stack of paper P, whereby the stack of paper P
is transported to the offset tray discharge path 27. Thereafter, by
the discharge rollers 44, the stack of paper P is discharged
through the offset tray discharge path 27 to the offset tray
11.
[0248] As described above, in the sheet post-processing device 1,
when sheets of paper are stacked on the lower staple tray 15, the
sheets of paper are carried by the sheet supporter 55. Then, in the
state in which the sheet supporter 55 carries the sheets stacked,
the sheet supporter 55 slides upward/downward along the lower
staple tray 15.
[0249] Specifically, in the sheet post-processing device 1, when
the stack of paper P is formed by stacking a predetermined number
of sheets on the sheet supporter 55, the sheet supporter 55 moves
the stack of paper P to the stapling position. Then, after
application of the stapling operation to the stack of paper P, the
stack of paper P is brought up to the recessional position. After
the switching gate 34 is turned to such a side (sheet discharge
side) that the stack of paper P is allowed to go to the offset tray
discharge path 27, the sheet supporter 55 descends again, and in so
doing, the stack of paper P is released from the sheet supporter 55
and discharged onto the offset tray 11.
[0250] Thus, in the sheet post-processing device 1, by moving not
the stapler 59 but the stack of paper P, the stapling and discharge
operation is performed with respect to the stack of paper P.
Therefore, as to the sheet post-processing device 1, there is no
need to provide a driving system for moving the stapler 59. In
other words, that the sheet post-processing device 1 becomes
complicated and bulky is avoided.
[0251] Furthermore, in the sheet post-processing device 1, the
stack of paper P stapled is discharged, with the edge stapled going
in front. Therefore, without causing the edge of the stack of paper
P to fan out, stable discharge can be conducted.
[0252] Furthermore, in the sheet post-processing device 1, the
offset tray discharge path 27 is substantially horizontally
provided, starting from the lower edge of the lower stale tray 15.
Therefore, there is no need to bring up the stack of paper P upon
discharge of the stack of paper P, and as a result, the driving
system including transport rollers can be simplified, thereby
facilitating discharge of the sheets of paper.
[0253] Furthermore, in the sheet post-processing device 1, the
sheet supporter 55 is arranged to move the stack of paper P to the
stacking position, the stapling position, and the recessional
position. At the stacking position, the lower edge of the sheet
supporter 55 is positioned at substantially the same height as that
of the lower edge of the lower staple tray 15. The position of the
lower edge of the sheet supporter 55 is lower than the position
thereof in the case where the stack of paper P is at the
recessional position.
[0254] Thus, in the sheet post-processing device 1, since the
stacking position is lower than the recessional position, the size
of paper stackable in the lower staple tray 15 alone can be
greater. Note that the height of the stacking position is not
limited to this, and it may be equal to either that of the stapling
position or that of the recessional position.
[0255] Furthermore, in the sheet post-processing device 1, upon
discharge of the sheets of paper from the lower staple tray 15, the
sheet supporter 55 descends, in a state in which the switching gate
34 is turned to the sheet discharge side. For the foregoing
descendence, the slits 55c for let the end portion of the switching
gate 34 through the sheet supporter 55 are provided in the sheet
supporter 55. With this arrangement, the sheets of paper carried on
the sheet supporter 55 are surely stopped on the switching gate
34.
[0256] Incidentally, the sheet post-processing device 1 is expected
to be adapted to an image forming device, placed side by side.
Therefore, to reduce the space of a floor that the sheet
post-processing device occupies, the staple tray 10 is
substantially perpendicularly provided. However, the manner of
provision of the staple tray 10 is not limited to this, and the
staple tray 10 may be horizontally provided. This arrangement is
preferable particularly in the case where sheet post-processing
device 1 is placed on the top of or under the image forming
device.
[0257] Furthermore, in the case where the staple tray 10 is
horizontally provided, in adjusting sheets of paper, to utilize the
own weight of the sheets is difficult, and therefore, it is
preferable to adjust the four edges of the sheets on the staple
tray 10.
[0258] Furthermore, in the sheet post-processing device 1, all the
operation of moving the stack of paper P along the staple tray 10
is carried out by the sheet supporter 55. However, the operation of
moving the stack of paper P is not limited to this, and members for
moving the stack of paper P may be provided depending on types of
the moving operations, respectively.
[0259] For example, individual members may be provided (1) for
descending the stack of paper P to the staple opening of the
stapler 59 from the position at which the stack of paper P is
formed, and (2) for moving the stack of paper P away from the
staple opening to the recessional position. This arrangement is
preferable particularly in the case where the staple tray 10 is
horizontally disposed.
[0260] Furthermore, in the sheet post-processing device 1, at least
either the sheet supporter 55 or the adjusting plates 57 preferably
has conductivity and is grounded. By this arrangement, it is
possible to remove charge from the sheets of paper stacked on the
staple tray 10, whereby adjustment of the sheets of paper on the
staple tray 10 is facilitated.
[0261] [Third Embodiment]
[0262] The following description will explain a third embodiment of
the present invention. The members having the same structure
(function) as those in the first and second embodiments will be
designated by the same reference numerals and their description
will be omitted.
[0263] The description of the present embodiment will explain a
paper guide 70 in detail, which is included in the sheet
post-processing device 1 shown in FIG. 1.
[0264] As shown in the first embodiment, in the sheet
post-processing device 1, in the case where a stapling operation is
applied to sheets of paper fed out of the copying machine 2, the
sheets of paper are stacked on the staple tray 10, transported
through two major transport paths. Then, after the stapling
operation, the sheets of paper are fed out to the offset tray
11.
[0265] One of the transport paths is a path used to transport
small-size paper. In the case where sheets of paper fed out of the
copying machine 2 are small, the sheets of paper pass the gap G
(see FIG. 1) between the upper staple tray 14 and the lower staple
tray 15, and are stacked on the lower staple tray 15. Then, after a
post-processing operation is applied thereto, the sheets are
discharged onto the offset tray 11 through the lower edge of the
staple tray 10.
[0266] On the other hand, another transport path is a path used to
transport large-size paper. In the case where sheets of paper fed
out of the copying machine 2 are large, the sheets do not pass the
gap G but are transported through the detour path 22 shown in FIG.
2, and are stacked on the staple tray 10. Then, after a
post-processing operation is applied thereto, the sheets are
discharged onto the offset tray 11 through the lower edge of the
staple tray 10.
[0267] The detour path 22 rises from the feed-in opening 4 along
the upper staple tray 14 and curving around the upper edge of the
upper staple tray 14. Thus, going around inside the main body of
the sheet post-processing device 1, the path reaches the lower edge
of the lower staple tray 15.
[0268] In other words, in the sheet post-processing device 1, the
sheet transport paths are provided in an oval shape in peripheral
parts of the sheet post-processing device 1.
[0269] Furthermore, in the sheet post-processing device 1, a paper
guide 70 is provided on an inward side with respect to the detour
path 22, vis-a-vis the staple tray 10 which is perpendicularly
disposed. The paper guide 70 is provided for preventing the sheets
of paper stacked on the staple tray 10 from falling down.
[0270] Incidentally, in the case where the paper guide 70 is formed
with, for example, one plate, the paper guide 70 cannot be moved.
Therefore, in this case, if jamming of paper occurs to the
transport paths, inward sides of the oval-loop-like transport paths
in the sheet post-processing device 1 cannot be sufficiently
exposed.
[0271] The sheet post-processing device 1 has the paper guide 70
which has a paper jam solving structure arranged as described
below, whereby the inside of the transport paths is fully exposed
if a trouble occurs to the transport paths.
[0272] The following description will explain an arrangement of the
paper guide 70 of the sheet post-processing device 1.
[0273] FIG. 20 is a side view showing an arrangement of the paper
guide 70, and FIG. 21 is a front view showing the same. As shown in
these figures, the paper guide 70 is composed of an upper plate 71
and a lower plate 72. The plates 71 and 72 are joined by junction
parts 73 provided on both sides in a manner such that the plates 71
and 72 are pivotable.
[0274] On upper corners of the upper plate 71, fitting shafts 74
are provided, projecting therefrom. The fitting shafts 74 are fit
into a main body frame F of the fixing device, 1, in a manner such
that upper plate 71 is pivotable.
[0275] On the other hand, on one side edge of the lower plate 72, a
magnet (catching part) 75 is provided, projecting therefrom. The
magnet 75 is attracted and caught by (i) a catching member 79a for
guiding use and (ii) a projecting catching member 79b for opening
use, of the metal-made main body frame F of the sheet
post-processing device 1. A handle 76 is provided on the edge of
the lower plate 72, above the magnet 75.
[0276] Furthermore, on a lower end of the side edge of the lower
plate 72, a contacting plate 77 is provided, projecting therefrom.
At a position vis-a-vis the contacting plate 77, on the main body
frame F of the sheet post-processing device 1, a contacted plate 78
is provided, projecting therefrom.
[0277] Then, the contacting plate 77 of the lower plate 72 can be
brought into contact with a contacted plate 78, on the copying
machine 2 side, as shown in FIG. 20. In other words, the contacting
plate 77 comes into contact with the contacted plate 78, when
moving in such a direction as the paper guide 70 is opened.
[0278] The paper guide 70 arranged as described above can be
positioned at (i) a guiding position and (ii) an opening position
for opening the transport paths, indicated by a solid line and a
two-dot chain line, respectively, in FIG. 20.
[0279] The guiding position is a position (a position vis-a-vis the
staple tray 10) at which the paper guide 70 is placed in order to
prevent the sheets of paper stacked on the staple tray 10 from
falling down. The opening position is a position at which the paper
guide 70 is placed when jamming occurs.
[0280] At the opening position, the paper guide 70 is in a shape
conformable to the oval-loop-like detour path 22. The paper guide
70 can be placed at the opening position, by pivoting the plates 71
and 72.
[0281] The following description will explain the pivoting
operations of the paper guide 70.
[0282] In the case where sheets stacked on the staple tray 10
composed of the upper and lower staple trays 14 and 15 are jamming,
the operator opens a side wall (not shown) of the sheet
post-processing device 1. The operator, by so doing, can look into
an opening 79 in a state shown in FIG. 20.
[0283] Then, the operator grips the handle 76 on the lower plate 72
of the paper guide 70, and pulls it in an arrow A direction of FIG.
20. By so doing, the magnet 75 and the guiding-use catching member
79a of the main body frame F of the sheet post-processing device 1
become separated, no longer adhering to each other. The upper plate
71, which is pivotable with the fitting shafts 74 as a pivot,
pivots in an anti-clockwise direction. As a result, the lower plate
72 goes up, whereby the contacting plate 77 moves upward, and the
contacting plate 77 and the contacted plate 78 become separated, no
longer contacting each other.
[0284] Subsequently, the operator pulls up the handle 76 of the
lower plate 72. The handle 76 is pulled until the magnet 75 adheres
to the opening-use projecting catching member 79b of the main body
frame F, at the right-hand end of the opening 79, in the sheet
post-processing device 1. With this adhesion, the lower plate 72 is
caught on the main body frame F, whereby the paper guide 70 is
placed at the opening position.
[0285] At the opening position, the paper guide 70 is in a shape
conformable to the oval-loop-like detour path 22 in the sheet
post-processing device 1, and all the transport paths of the sheet
post-processing device 1 are exposed. This makes it easy for the
operator to solve jamming of paper occurring in the transport
paths. More specifically, the operator is allowed to insert his/her
hand deeply, thereby being able to solve the jamming of paper
easily.
[0286] Furthermore, after solving the jamming of paper, the
operator pulls the handle 76 in a direction opposite to the arrow A
direction. By so doing, the magnet 75 and the opening-use catching
member 79b of the sheet post-processing device 1 are separated, no
longer adhering to each other.
[0287] Then, the operator, gripping the handle 76, insets the
contact plate 77 of the lower plate 72 behind the contacted plate
78. By so doing, the magnet 75 of the lower plate 72 adheres to the
guiding-use catching member 79a, whereby the paper guide 70 is
placed at the guiding position.
[0288] As described above, in the sheet post-processing device 1,
the paper guide 70 is manually moved from the guiding position to
the opening position, so that the paper guide 70 is deformed to a
shape conformable to the detour path 22. In other words, by
deforming the paper guide 70 to a shape conformable to the detour
path 22, the inside thereof is exposed.
[0289] Therefore, the oval-shape hollow part surrounded by the
detour path 22 is exposed to the operator. This makes it easy for
the operator to solve jamming of paper occurring to the detour path
22 or the staple tray 10.
[0290] Furthermore, in the sheet post-processing device 1, the
paper guide 70 is composed of the two upper and lower plates 71 and
72 which are joined in a manner such that they are pivotable.
Therefore, an opened area of a greater size is ensured, as compared
with a case where the paper guide 70 is composed of one plate. As a
result, a space in which the paper jam solving operation is carried
out can be greatly expanded, thereby making it easier for the
operator to solve the jamming of paper.
[0291] Furthermore, since the paper guide 70 is composed of the two
plates 71 and 72, even if the sheet post-processing device 1 is
made thinner whereby the detour path 22 is in a depressed oval loop
form, it is possible to open the paper guide 70 by deforming it to
a shape conformable to the depressed oval loop. Therefore,
regarding the sheet post-processing device 1, a sufficiently opened
state of the transport paths is ensured, while the device can be
made thinner.
[0292] Furthermore, in the sheet post-processing device 1, the
upper edge of the upper plate 71 of the paper guide 70 is fit to
the main body frame F of the sheet post-processing device 1 by
utilizing the fitting shafts 74, in a manner such that the upper
plate 71 is pivotable. Therefore, in moving the paper guide 70 to
the opening position, an area of a greater size is exposed inside
the detour path 22 in the oval-loop shape.
[0293] Furthermore, the magnet 75 which can be caught by the
guiding-use catching member 79a and the opening-use projecting
catching member 79b of the main body frame F of the sheet
post-processing device 1 is provided on the lower plate 72. This
ensures that the paper guide 70 is properly fixed at the guiding
position and the opening position. In other words, in the sheet
post-processing device 1, the paper guide 70 is surely kept at the
position vis-a-vis the staple tray 10, by using the magnet 75.
[0294] Furthermore, In the sheet post-processing device 1, the
magnet 75 is used to fixing the paper guide 70 at the guiding
position and the opening position. Therefore, in moving the paper
guide 70 between the guiding position and the opening position, the
paper guide 70 is easily stopped at the guiding position or the
opening position only by bringing the paper guide 70 more or less
close thereto. Besides, only by pulling it, the paper guide 70 is
moved away therefrom. Thus, the paper guide 70 is more easily moved
between the guiding position and the opening position.
[0295] Furthermore, the sheet post-processing device 1 is arranged
so that, in moving the paper guide 70 between the guiding position
and the opening position, the operator manipulates by gripping the
handle 76 provided on the lower plate 72. For this reason, the
manipulability of the paper guide 70 is greatly enhanced.
[0296] Furthermore, in the paper guide 70, the handle 76 is
provided on the lower plate 72. This means that the paper guide 70
is moved with its end portion gripped, and as a result, the
manipulation of the paper guide 70 is more efficiently carried out
as compared with the case where the paper guide 70 is moved with
its portion close to the pivot being gripped.
[0297] Furthermore, on the lower plate 72 of the paper guide 70,
the handle 76, the magnet 75, and the contact plate 77 are provided
in this order from the top. Therefore, since the operator grips the
handle 76 in manipulating the paper guide 70, the paper guide 70 is
moved by utilizing the leverage, wherein in this case the handle
76, the contact plate 77, and the magnet 75 are the point of force,
the fulcrum, and the point of action, respectively. Consequently,
without applying a great force, the operator can shift the paper
guide 70 easily.
[0298] Incidentally, in the present embodiment, the paper guide 70
is composed of the two plates, but the structure of the paper guide
70 is not limited to this. The paper guide 70 may be composed of
more than two plates. By this arrangement, it is possible to the
paper guide 70 be deformed to a shape more conformable to the
detour path 22 when the paper guide 70 is shifted to the opening
position.
[0299] Furthermore, in the present embodiment the magnet 75 is used
for fixing the paper guide 70 to the guiding position and the
opening position, but the member for fixing the paper guide 70 is
not limited to the magnet 75. Anything can be adapted, for example,
concave and convex members interfitting to each other, or hooking
members, provided that the lower plate 72 is surely caught on the
main body frame F of the sheet post-processing device 1.
[0300] Furthermore, the handle 76 of the paper guide 70 is provided
above the magnet 75 of the lower plate 72, but the position of the
handle 76 of the paper guide 70 is not limited to this. The handle
76 may be provided on, for example, the upper plate 71.
Alternatively, the handle 76 may be provided right on the magnet 75
of the lower plate 72 so that the handle 76 overlaps the magnet
75.
[0301] Furthermore, though the descriptions of the first through
third embodiments mention only the case where the stapling
operation is applied as the post-processing operation conducted by
the sheet post-processing device 1 with respect to sheets of paper,
the post-processing operation conducted by the sheet
post-processing device 1 is not limited to the stapling operation.
The sheet post-processing device 1 is capable of performing, in
addition to the stapling operation, a punching operation, a gluing
operation, and the like with respect to sheets of paper.
[0302] As has been described so far, a first sheet post-processing
device of the present invention is a sheet post-processing device,
which stacks on a post-processing tray sheets of paper discharged
from an image forming device and discharges the stacked sheets of
paper after applying a post-processing operation thereto, is
arranged so that (i) a feed-in opening through which the sheets of
paper are supplied from the image forming device is positioned
between an imaginary horizontal plane crossing an upper edge of the
post-processing tray and an imaginary horizontal plane crossing the
lower edge of the post-processing tray, and (ii) the
post-processing tray is provided so as to have such inclination
that a length of the post-processing tray projected on a vertical
plane is greater than a length of the post-processing tray
projected on a horizontal plane.
[0303] With the foregoing arrangement, the post-processing tray and
the feed-in opening are provided so that the feed-in opening
through which sheets of paper are supplied from the image forming
device is positioned between the imaginary horizontal plane
crossing the upper edge of the post-processing tray and the
imaginary horizontal plane crossing the lower edge of the
post-processing tray, or to state differently, a part of the
post-processing tray is positioned upper than the feed-in opening.
By this arrangement, the post-processing tray is provide in the
upper part of the sheet post-processing device. In this case, even
if the sheets of paper to which the post-processing operation is
applied are discharged from the post-processing tray through the
lower edge thereof to the discharge tray without being brought up,
a sufficient discharge capacity can be obtained.
[0304] Furthermore, a second sheet post-processing device of the
present invention is arranged so as to include a detour transport
path through which the sheets of paper supplied through the feed-in
opening are transported to the post-processing tray by going around
the upper edge or the lower edge of the post-processing tray.
[0305] With the foregoing arrangement, even in the case where the
post-processing tray is substantially perpendicularly provided in
the sheet post-processing device, the sheets of paper are supplied
to the post-processing tray through the detour transport path which
goes around either the upper edge or the lower edge of the
post-processing tray and is connected to an edge of the
post-processing tray which is an edge other than the edge that the
detour transport path goes around. By this arrangement, if the
width of the sheet post-processing device in the sheet transport
direction is set smaller, the radius of curvature of the curving
part of the detour transport path can be set sufficiently great,
whereby stable sheet transportation is ensured.
[0306] Furthermore, a third sheet post-processing device of the
present invention is the second sheet post-processing device
further including (i) at least one first discharge tray to which
the sheets of paper are supplied through a first discharge
transport path which is provided in the upper part of the sheet
post-processing device and branches out from the detour transport
path on a side opposite to the feed-in opening side, and (ii) a
second discharge tray to which the sheets of paper are supplied
from the post-processing tray through a second discharge transport
path which is provided in the lower part of the sheet
post-processing device and extends from the lower edge of the
post-processing tray on the side opposite to the feed-in opening
side.
[0307] According to the foregoing arrangement, the sheet
post-processing device has the first and second discharge trays.
Here, in the case where the image forming device has a facsimile
function, a print function, and the like in addition to the copy
function, the first and second discharge trays can be used
respectively for the operational modes of the image forming
device.
[0308] Furthermore, since the first discharge transport path
branches out from the detour transport path, there is no need to
ensure a space for a transport path for discharging the sheets of
paper to the first discharge tray. Therefore, it is possible to
provide the first discharge tray at as upper a position as possible
in the sheet post-processing device, and with this, it is possible
to provide the second discharge tray at an upper position. This
enables that the second discharge tray has a sufficiently great
capacity, and that the first discharge tray with a relatively small
capacity can be provided on the same side as the second discharge
tray is.
[0309] Furthermore, a fourth sheet post-processing device of the
present invention is the second or third sheet post-processing
device further including a reversing transport path for reversing
and sending the sheets of paper to the detour transport path, and
the reversing transport path is provided substantially
perpendicularly between the post-processing tray and the feed-in
opening, in a manner such that end portions of the reversing
transport path and the detour transport path in the vicinity of a
junction therebetween are linearly provided.
[0310] With to the foregoing arrangement wherein the reversing
transport path is substantially perpendicularly between the
post-processing tray and the feed-in opening, it is possible to
prevent the provision of the reversing transport path from causing
the width of the sheet post-processing device to increase.
Furthermore, since the reversing transport path is provided so that
the end portions of the reversing transport path and the detour
transport path in the vicinity of a junction therebetween are
linearly provided, transport jamming of sheets of paper during the
reversing operation scarcely occurs.
[0311] Furthermore, a fifth sheet post-processing device of the
present invention is any one of the second through fourth sheet
post-processing devices further including a direct transport path
for transporting the sheets of paper supplied through the feed-in
opening directly to the center of the post-processing tray so that
the detour transport path is not used, wherein in the center of the
post-processing tray, there is provided a sheet passing opening
through which the sheets of paper transported through the direct
transport path are sent to a surface of the post-processing
tray.
[0312] With the foregoing arrangement, the sheets of paper supplied
through the feed-in opening are transported to the surface of the
post-processing tray, without using the detour transport path, but
by using the direct transport path which directly sends the sheets
of paper thereto through the sheet passing opening to the center of
the post-processing tray. Consequently, for example, sheets of
paper to which no post-processing operation is applied are
discharged to the second discharge tray through a short transport
route, without using the detour transport path. Therefore, a time
since the commencement of the copying operation until the first
sheet is discharged, that is, a first copy time, is shortened, and
besides, occurrence of transport jamming of paper can be suppressed
since sheets of paper are transported not via the curving detour
transport path.
[0313] Furthermore, a sixth sheet post-processing device of the
present invention is either the fourth or fifth sheet
post-processing device further arranged so that (i) the
entrance/exit of the reversing transport path and the sheet passing
opening are provided next to each other, (ii) three associated
rollers for transporting the sheets of paper to the entrance/exit
of the reversing transport path and the sheet passing opening, the
three associated rollers being provided in the vicinity of the
entrance/exit of the reversing transport path and the sheet passing
opening, and (iii) the transport rollers other than the three
associated rollers are driven by a first driving system, while the
three associated rollers are driven by a second driving system.
[0314] According to the foregoing arrangement, the entrance/exit of
the reversing transport path and the sheet passing opening are
provided next to each other and a pair of transport rollers
rotatable in non-reverse and reverse directions both and a pair of
transport rollers for the sending the sheets of paper to the sheet
passing opening of the post-processing tray are all together
composed of the three associated rollers. Therefore, the reversing
transport path and the entrance/exit of the post-processing tray
are provided close to each other, whereby increase of the width of
the sheet post-processing device can be prevented.
[0315] Furthermore, only the three associated rollers are driven by
the second driving system, while the other transport rollers are
driven by the first driving system, whereby the transport roller
driving system structure can be simplified.
[0316] Furthermore, a seventh sheet post-processing device of the
present invention is either the fourth or fifth sheet
post-processing device further arranged so that a part of the
post-processing tray and the reversing transport path are pivotably
provided, and by pivoting the part of the post-processing tray and
the reversing transport path, the sheets of paper sent thereto
through the direct transport path are guided to either the
post-processing tray or the reversing transport path.
[0317] With the foregoing arrangement, in the case where the sheets
of paper sent thereto through the direct transport path are to be
guided to the post-processing tray, the post-processing tray is
pivoted, whereby a space on the sheet holding surface side of the
post-processing tray becomes larger. As a result, a stacking
capacity of the post-processing tray can be expanded.
[0318] Furthermore, an eighth sheet post-processing device of the
present invention, which stacks on a post-processing tray sheets of
paper discharged from an image forming device and discharges the
stacked sheets of paper after a post-processing operation is
applied thereto by post-processing means, is arranged so as to
comprise (i) adjusting-moving means which is movably provided on
the post-processing tray so as to slide along the post-processing
tray, the adjusting-moving means moving the sheets of paper stacked
on the post-processing tray so as to be adjusted at a
post-processing position at which a post-processing operation can
be performed by the post-processing means, and thereafter moving
the sheets of paper subjected to the post-processing operation by
the post-processing means away from the post-processing position
with an edge of the stack of sheets of paper subjected to the
post-processing operation being put in the rear, and (ii)
discharging means for discharging from the post-processing tray the
stack of paper moved away from the post-processing position after
the post-processing operation, with the edge of the stack of paper
subjected to the post-processing operation being put in front.
[0319] According to the foregoing arrangement, when the sheets of
paper are stacked on the post-processing tray, the sheets of paper
stacked are moved by the adjusting-moving means to the
post-processing position at which the post-processing operation by
the post-processing means is applicable. Here, the sheets of paper
are adjusted at the post-processing position.
[0320] The sheets of paper subjected to the post-processing
operation at the post-processing position are moved away from the
post-processing position by the adjusting-moving means, with the
edge subjected to the post-processing operation being put in the
rear, and the discharging means discharges from the post-processing
tray the sheets of paper thus moved away from the post-processing
position, with the edge subjected to the post-processing operation
being put in front.
[0321] With the foregoing arrangement wherein the post-processing
and discharging operations are thus performed by moving the stack
of sheets of paper without moving the post-processing means such as
a stapler, a driving system for moving the post-processing means is
unnecessary, whereby the sheet post-processing device can be
prevented from becoming complicated and bulky.
[0322] Furthermore, since the stack of paper is discharged with the
edge thereof stapled being put in front in the case where the
stapling operation is carried out as the post-processing operation,
the edge of the stack of paper by no means fans out when the sheets
of paper are discharged, thereby ensuring stable discharge of the
sheets of paper.
[0323] Furthermore, a ninth sheet post-processing device of the
present invention is the eighth sheet post-processing device
further arranged so that (1) the post-processing tray is
substantially perpendicularly provided in the sheet post-processing
device, (2) the post-processing means is provided below the
post-processing tray, (3) the adjusting-moving means is movably
provided so as to slide along the post-processing tray
upward/downward and includes a sheet supporting member for
supporting lower edges of the sheets of paper stacked on the
post-processing tray and adjusting the lower edges of the sheets,
wherein (i) when a predetermined number of sheets of paper are
stacked on the sheet supporting member, the sheet supporting member
while carrying the sheets of paper moves to the post-processing
position at which the post-processing means conducts the
post-processing operation with respect to the sheets of paper, (ii)
then, after the post-processing operation is applied to the sheets
of paper by the post-processing means, the sheet supporting member
goes up while supporting the sheets of paper thus subjected to the
post-processing operation, (iii) and the discharging means
discharges the sheets of paper brought up after the completion of
the post-processing operation by the sheet supporting member.
[0324] With the foregoing arrangement, in the case where the sheets
of paper are stacked on the post-processing tray, the sheets of
paper are supported by the sheet supporting member, and the sheet
supporting member can slides upward/downward along the
post-processing tray, while carrying the sheets of paper thus
stacked. Therefore, when a predetermined number of sheets are
stacked on the sheet supporting member, the sheet supporting member
moves to the post-processing position while carrying the sheets of
paper thus stacked, and goes up after the post-processing operation
is applied to the sheets of paper. Then, the sheet supporting
member stops supporting the sheets of paper, and the sheets of
paper are discharged.
[0325] Thus, the post-processing and discharging operations are
carried out by moving the sheets of paper after the post-processing
operation, without moving the post-processing means such as a
stapler. Therefore, a driving system for moving the post-processing
means is unnecessary, whereby the sheet post-processing device can
be prevented from becoming complicated and bulky.
[0326] Furthermore, in the case where the stapling operation is
performed as the post-processing operation, since the sheets of
paper are discharged with the edges of sheets stapled being put in
front, the edges of the sheets by no means fan out when the sheets
of paper are discharged, thereby ensuring stable discharge of the
sheets of paper.
[0327] Furthermore, a tenth sheet post-processing device of the
present invention is the ninth sheet post-processing device further
arranged so that the adjusting-moving means is movably provided so
as to slide rightward/leftward along the post-processing tray and
includes a sheet adjusting member for adjusting side edges of the
sheets of paper stacked on the post-processing tray, wherein at
least either the sheet supporting member or the sheet adjusting
member is conductive and grounded.
[0328] With the foregoing arrangement, if the sheets of paper
stacked on the post-processing tray are charged, the charge is
removed from the sheets of paper through the sheet supporting
member or the sheet adjusting member, whereby the adjusting
operation of the sheets of paper on the post-processing tray is
facilitated.
[0329] Furthermore, an eleventh sheet post-processing device of the
present invention is any one of the eighth through tenth sheet
post-processing devices further arranged so that the discharge
transport path used for discharging the sheets of paper subjected
to the post-processing operation is substantially horizontally
provided, extending from the lower edge of the post-processing
tray.
[0330] With the foregoing arrangement, the sheets of paper
subjected to the post-processing operation are discharged through
the discharge transport path extending substantially horizontally
from the lower edge of the post-processing tray. Therefore, there
is no need to bring the sheets of paper upward, and this simplifies
the driving system such as the transport rollers, thereby making
the sheet discharging operation easier.
[0331] Furthermore, a first paper jam solving system of a sheet
post-processing device of the present invention is a paper jam
solving system of the sheet post-processing device in which sheets
of paper supplied from an image forming device are stacked on a
post-processing tray and a stapling operation is applied as a
post-processing operation to the sheets of paper thus stacked, and
thereafter the sheets of paper are discharged to the discharge
tray, and is characterized in that (1) the post-processing tray is
perpendicularly provided and (2) an opening through which the
sheets of paper supplied from the image forming device are passed
is provided at a substantially middle position of the
post-processing tray, wherein (i) the sheets of paper supplied from
the image forming device are supplied through the opening to a
lower part of the post-processing tray and are stacked thereon, and
thereafter are discharged to the discharge tray through a lower
edge of the post-processing tray, or (ii) the sheets of paper are
transported along an upper part of the post-processing tray and
sent to the lower part of the post-processing tray through a detour
transport path which goes around an upper edge of the upper part of
the post-processing tray, goes through peripheral parts of the
sheet post-processing device main body, and reaches the lower edge
of the lower part of the post-processing tray, and the sheets of
paper thus stacked on the post-processing tray are thereafter
discharged onto the discharge tray. The paper jam solving system
further includes a paper guide for preventing the sheets of paper
stacked on the post-processing tray from falling down, which is
provided vis-a-vis the post-processing tray on an inward side to
the detour transport path and is composed of a plurality of plates
pivotably joined with each other.
[0332] With the foregoing arrangement, the sheets of paper supplied
from the image forming device are sent through either of the two
major transport paths and are stacked on the post-processing tray,
and after a stapling operation as the post-processing operation is
carried out, the sheets of paper are discharged onto the discharge
tray.
[0333] One of the transport paths is to be used for paper of a
small size. Sheets of such paper supplied from the image forming
device are sent through the opening and stacked on the lower part
of the post-processing tray perpendicularly provided, and after the
post-processing operation, the sheets of paper are discharged onto
the discharge tray through the lower edge of the post-processing
tray.
[0334] On the other hand, the other transport path is to be used
for paper of a large size. Sheets of such paper supplied from the
image forming device are, not passing the opening, transported
directly along the upper part of the post-processing tray which is
perpendicularly provided. Then, the sheets of paper are transported
through the detour transport path which goes around the upper edge
of the upper part of the post-processing tray, goes through the
peripheral parts of the main body of the sheet post-processing
device, and then, reaches the lower edge of the lower part of the
post-processing tray. Thus, the sheets of paper are stacked on the
post-processing tray, and after the post-processing operation is
applied to the sheets of paper there, the sheets of paper are
discharged onto the discharge tray through the lower edge of the
post-processing tray.
[0335] In other words, in the aforementioned arrangement, the
transport path is formed in oval, going through the peripheral
parts of the sheet post-processing device.
[0336] On the other hand, the paper guide for preventing the sheets
of paper stacked from falling down is provided on an inward side to
the transport path, vis-a-vis the post-processing tray which is
perpendicularly provided.
[0337] Here, when jamming of paper occurs to the post-processing
tray, the paper guide can be opened since there is an oval hollow
space on the inward side to the detour transport path. However, if
the paper guide is composed of one plate, the paper guide cannot be
deformed so as to conform with the oval, and therefore, sufficient
disclosure cannot be expected.
[0338] However, in the aforementioned arrangement, the paper guide
is composed of a plurality of plates pivotably joined with each
other. Therefore, it is possible to open the paper guide by
deforming it so as to conform with the periphery of the oval space
inside the detour transport path, and hence, a sufficient opened
space is ensured, whereby the paper jam solving operation is
facilitated.
[0339] Furthermore, even if thinning the sheet post-processing
device causes the oval of the detour transport path to become
depressed, the paper guide can be opened, by deforming it so as to
conform the depressed oval.
[0340] As a result, it is possible to ensure the sufficient opening
state of the transport path and to provide the paper jam solving
system which allows the sheet post-processing device to be made
thinner.
[0341] Furthermore, a second paper jam solving system of a sheet
post-processing device is the first paper jam solving system of the
sheet post-processing device further arranged so that the paper
guide is composed of upper and lower plates pivotably joined to
each other, wherein an upper edge of the upper plate is pivotably
fit to the main body of the sheet post-processing device, while a
catching part for causing the lower plate to be caught to the main
body of the sheet post-processing device is provided on the lower
plate.
[0342] With the foregoing arrangement, the paper guide is composed
of the two plates, that is, the upper and lower plated, which are
pivotably joined with each other. The upper edge of the upper plate
is pivotably fit to the main body of the sheet post-processing
device. Therefore, in opening the paper guide, the opened space can
be made as large as possible inside the oval detour transport
path.
[0343] Furthermore, the lower plate is equipped with the catching
part for causing the lower plate to be caught on the main body of
the sheet post-processing device. Therefore, it is possible to
ensure that the paper guide is caught at a position vis-a-vis the
post-processing tray.
[0344] Furthermore, a third paper jam solving system of the present
invention is the second paper jam solving system further arranged
so that the catching part is made of a magnet.
[0345] With the foregoing arrangement wherein the catching part is
made of a magnet, in shifting the paper guide from the opening
position to the position vis-a-vis the post-processing tray, the
paper guide is easily caused to adhere at the position vis-a-vis
the post-processing tray, only by closing the paper guide thereto
to some extent.
[0346] Therefore, the paper guide is easily and surely caught to
the main body of the sheet post-processing device. In shifting the
paper guide to the opening position, the paper guide is separated
therefrom only by pulling it. Thus, the paper guide can be easily
shifted to the opening position.
[0347] Furthermore, a fourth paper jam solving system of a sheet
post-processing device of the present invention is either the
second or third paper jam solving system further arranged so that
the lower plate of the paper guide is equipped with a handle.
[0348] With the foregoing arrangement, the operator can manipulate
the paper guide by gripping the handle provided on the lower plate,
in shifting the paper guide to the opening position. Therefore, the
manipulability in opening the paper guide is enhanced.
[0349] Besides, the handle is provided on the lower plate. This
means that the paper guide is moved with its end portion gripped,
and as a result, the manipulation of the paper guide is more
efficiently carried out as compared with the case where the paper
guide is moved with its portion close to the pivot being
gripped.
[0350] Furthermore, a fifth paper jam solving system of a sheet
post-processing device of the present invention is the fourth paper
jam solving system further arranged so that the handle provided on
the lower plate of the paper guide is just above the catching part,
while a lower edge of the lower plate of the paper guide is brought
into contact with a rear surface of a contacted plate provided on
the main body of the sheet post-processing device.
[0351] According to the foregoing arrangement, the handle, the
catching part, and a contacting part are provided on the lower
plate of the paper guide in this order from the top.
[0352] Therefore, since the operator grips the handle in
manipulating the paper guide in shifting the paper guide to the
opening position, the paper guide is moved by utilizing the
leverage, wherein in this case the handle, the contacting part, and
the catching part are the point of force, the fulcrum, and the
point of action, respectively.
[0353] As a result, without applying a great force, the operator
can shift the paper guide easily.
[0354] The invention being thus described, it will be obvious that
the same may be varied in many ways. Such variations are not to be
regarded as a departure from the spirit and scope of the invention,
and all such modifications as would be obvious to one skilled in
the art are intended to be included within the scope of the
following claims.
* * * * *