U.S. patent application number 11/008271 was filed with the patent office on 2006-03-30 for sheet post-process apparatus.
This patent application is currently assigned to TOSHIBA TEC KABUSHIKI KAISHA. Invention is credited to Tomomi Iijima, Tokihiko Ise, Hiroyuki Taki, Yasunobu Terao, Mikio Yamamoto.
Application Number | 20060066026 11/008271 |
Document ID | / |
Family ID | 36098114 |
Filed Date | 2006-03-30 |
United States Patent
Application |
20060066026 |
Kind Code |
A1 |
Terao; Yasunobu ; et
al. |
March 30, 2006 |
Sheet post-process apparatus
Abstract
A waiting tray is provided in a sheet-conveying path and holds
sheets if the sheets need to be post-processed. A processing tray
receives sheets conveyed from the waiting tray. It may receive
sheets conveyed through the sheet-conveying path and coming not via
the waiting tray, before the sheets are post-processed. A conveying
mechanism is provided, which causes the sheets to fall, due to
gravity, from the waiting tray onto a processing tray. A
sheet-aligning mechanism aligns the sheets on the processing tray,
at their transverse edges and longitudinal edges. On the processing
tray, the sheets are post-processed, forming a bundle. The
conveying mechanism conveys the bundle of sheets to a storage tray.
A gap is provided between the lower surface of the waiting tray and
a nip between sheet-feeding rollers that are positioned upstream of
the waiting tray and are included in the plurality of rollers.
Inventors: |
Terao; Yasunobu;
(Tagata-gun, JP) ; Iijima; Tomomi; (Mishima-shi,
JP) ; Yamamoto; Mikio; (Tagata-gun, JP) ; Ise;
Tokihiko; (Tagata-gun, JP) ; Taki; Hiroyuki;
(Tagata-gun, JP) |
Correspondence
Address: |
FOLEY AND LARDNER LLP;SUITE 500
3000 K STREET NW
WASHINGTON
DC
20007
US
|
Assignee: |
TOSHIBA TEC KABUSHIKI
KAISHA
|
Family ID: |
36098114 |
Appl. No.: |
11/008271 |
Filed: |
December 10, 2004 |
Current U.S.
Class: |
270/58.11 |
Current CPC
Class: |
B65H 29/34 20130101;
B65H 31/24 20130101; B65H 2801/27 20130101; B65H 31/34
20130101 |
Class at
Publication: |
270/058.11 |
International
Class: |
B65H 37/04 20060101
B65H037/04 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 28, 2004 |
JP |
2004-282208 |
Claims
1. A sheet post-process apparatus comprising: a plurality of
rollers which receive sheets from an MFP and convey the sheets
forward; a waiting tray which is provided in a conveying path and
holds the sheets conveyed from the rollers when the sheets need to
be post-processed, a gap being provided between the lower surface
of the waiting tray and a nip between sheet-feeding rollers
included in the plurality of rollers; a processing tray which holds
the sheets conveyed from the waiting tray and the sheets conveyed
via the conveying path without being conveyed to the waiting tray,
before the sheets are post-processed; a conveying mechanism which
causes the sheets to fall, due to gravity, from the waiting tray
onto the processing tray; a sheet-aligning mechanism which aligns
the sheets with one another on the processing tray, at transverse
edge and longitudinal edge, thereby forming a bundle of sheets; a
post-process mechanism which performs a post-process on the bundle
of sheets on the processing tray; sheet-conveying means for
conveying the bundle of sheets from the processing tray; and a
storage tray which holds the bundle of sheets conveyed from the
processing tray.
2. The sheet post-process apparatus according to claim 1, wherein
the waiting tray and the processing tray are inclined and have a
rear end each, which is positioned at a lowest position.
3. The sheet post-process apparatus according to claim 1, wherein
the sheet-aligning mechanism has a longitudinal-alignment unit and
a transverse-alignment unit.
4. The sheet post-process apparatus according to claim 1, wherein
the waiting tray has a sheet-alignment mechanism.
5. The sheet post-process apparatus according to claim 1, wherein a
rear end of the processing tray is positioned at upstream of a rear
end of the waiting tray.
6. A sheet post-process apparatus comprising: first means for
receiving receive sheets from an MFP and convey the sheets forward;
second means provided in a conveying path, for holding the sheets
conveyed from the first means when the sheets need to be
post-processed, a gap being provided between the lower surface of
the second means and a nip between sheet-feeding rollers included
in the first means; third means for holding the sheets conveyed
from the second means and the sheets conveyed via the conveying
path without being conveyed to the second means, before the sheets
are post-processed; fourth means for causing the sheets to fall,
due to gravity, from the second means onto the third means; fifth
means for aligning the sheets with one another on the third means,
at transverse edge and longitudinal edge, thereby forming a bundle
of sheets; sixth means for performing a post-process on the bundle
of sheets on the third means; seventh means for conveying the
bundle of sheets from the third means; and eighth means for holding
the bundle of sheets conveyed from the third means.
7. The sheet post-process apparatus according to claim 6, wherein
the second means and the third means are inclined and have a rear
end each, which is positioned at a lowest position.
8. The sheet post-process apparatus according to claim 6, wherein
the fifth means has a longitudinal-alignment unit and a
transverse-alignment unit.
9. The sheet post-process apparatus according to claim 6, wherein
the waiting tray has a sheet-alignment mechanism.
10. The sheet post-process apparatus according to claim 6, wherein
a rear end of the third means is positioned at upstream of a rear
end of the second means.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is based upon and claims the benefit of
priority from prior Japanese Patent Application No. 2004-282208,
filed Sep. 28, 2004, the entire contents of which are incorporated
herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a sheet post-process
apparatus, such as a finisher, which is designed for installation
at the outlet side of a multi-function periperal (MFP).
[0004] 2. Description of the Related Art
[0005] An apparatus called "finisher" is known, which receives
printed sheets supplied from an MFP and staples them together. In
the finisher, the sheets supplied from the MFP are sequentially
conveyed to a tray and stapled by a stapler, forming a bundle of
sheets. The bundle of sheets is ejected from the apparatus onto a
storage tray.
[0006] Jpn. Pat. Appln. KOKAI Publication No. 6-99070 discloses a
finisher. This finisher performs a post-process on sheets. In the
post-process, a stapler staples sheets. To process the sheets at
the same rate as the MFP processes them, it is necessary to reduce
the speed at which sheets are conveyed in the finisher. The
finisher therefore has a long sheet-conveying path.
[0007] Having a long sheet-conveying path, the finisher cannot be
as small as desired.
[0008] Jpn. Pat. Appln. KOKAI Publication 2003-128323 discloses a
technique of providing a gap between the storage tray and the inlet
port to the storage tray.
BRIEF SUMMARY OF THE INVENTION
[0009] An object of the present invention is to provide a sheet
post-process apparatus that can prevent a sheet from jamming with
the sheets held a waiting tray as it is conveyed to the waiting
tray.
[0010] A sheet post-process apparatus according to this invention
comprises: a plurality of rollers which receive sheets from an MFP
and convey the sheets forward; a waiting tray which is provided in
a conveying path and holds the sheets conveyed from the rollers
when the sheets need to be post-processed; a processing tray which
holds the sheets conveyed from the waiting tray and the sheets
conveyed via the conveying path without being conveyed to the
waiting tray, before the sheets are post-processed; a conveying
mechanism which causes the sheets to fall, due to gravity, from the
waiting tray onto the processing tray; a sheet-aligning mechanism
which aligns the sheets with one another on the processing tray, at
transverse edge and longitudinal edge, thereby forming a bundle of
sheets; a post-process mechanism which performs a post-process on
the bundle of sheets on the processing tray; sheet-conveying means
for conveying the bundle of sheets from the processing tray; and a
storage tray which holds the bundle of sheets conveyed from the
processing tray. A gap is provided between the lower surface of the
waiting tray and a nip between sheet-feeding rollers included in
the plurality of rollers.
[0011] Preferably, the waiting tray and the processing tray may be
inclined and may have a rear end each, which is positioned at a
lowest position.
[0012] The sheet-aligning mechanism may have a
longitudinal-alignment unit and a transverse-alignment unit.
[0013] Preferably, the waiting tray may have a sheet-alignment
mechanism.
[0014] It is desired that the rear end of the processing tray be
positioned at upstream of the end of the waiting tray.
[0015] In the apparatus, the waiting tray holds sheets to be
post-processed. The conveying mechanism causes these sheets to
fall, due to gravity, onto the processing tray. Hence, it suffices
to provide a sheet-waiting section that is just as long as the
waiting tray. This renders the sheet post-process apparatus
small.
[0016] As described above, a gap is provided between the lower
surface of the waiting tray and the nip between the sheet-feeding
rollers. The gap is broader than the height of a curled part that
each sheet may have. Therefore, no sheets will clog the inlet port
to the storage tray. Hence, the sheet at the nip is prevented from
jamming with the sheet conveyed next, and the order in which the
sheets are conveyed to the waiting tray will not be changed.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
[0017] FIG. 1 is a perspective view of a post-process apparatus
according to this invention;
[0018] FIG. 2 is a top view of the post-process apparatus according
to the invention;
[0019] FIG. 3 is a perspective view illustrating how the waiting
tray of the post-process apparatus performs its function;
[0020] FIG. 4 is a perspective view depicting the sheet-bundle
conveying mechanism provided in the post-process apparatus, and
explaining how sheets are aligned at longitudinal edges in the
post-process apparatus;
[0021] FIG. 5 is a perspective view showing the mechanism for
aligning sheets at their transverse edges;
[0022] FIG. 6 is a perspective view illustrating how the stapler
provided in the post-process apparatus performs its function;
[0023] FIGS. 7A and 7B are diagram explaining a problem that arises
when a sheet is conveyed from the sheet-feeding rollers to the
waiting tray;
[0024] FIG. 8 is a sectional view of the post-process apparatus,
showing how the first sheet moves from the input rollers to the
sheet-feeding roller;
[0025] FIG. 9 is a sectional view of the apparatus, explaining how
the first sheet moves from the sheet-feeding rollers to the waiting
tray;
[0026] FIG. 10 is a sectional view of the apparatus, explaining how
the second sheet moves from the sheet-feeding rollers to the
waiting tray;
[0027] FIG. 11 is a sectional view of the post-process apparatus,
showing how the waiting-tray rollers operate;
[0028] FIG. 12 is another sectional view of the apparatus,
illustrating how the waiting-tray rollers operate;
[0029] FIG. 13 is a sectional view of the apparatus, explaining how
an active drop is carried out;
[0030] FIG. 14 is a sectional view of the apparatus, explaining how
the third sheet is conveyed;
[0031] FIG. 15 is a sectional view of the apparatus, illustrating
how the stapler operates;
[0032] FIG. 16 is a sectional view of the apparatus, explaining how
a bundle of sheets moves between the processing tray and the
storage tray;
[0033] FIG. 17 is a sectional view of the apparatus, illustrating
how sheets move from the waiting tray to the storage tray; and
[0034] FIG. 18 is a sectional view of the apparatus, explaining how
the position of the storage tray is changed.
DETAILED DESCRIPTION OF THE INVENTION
[0035] An embodiment of this invention will be described, with
reference to the accompanying drawings.
[0036] FIG. 1 is a perspective view of a sheet post-process
apparatus according to this invention. FIG. 2 is a top view of the
post-process apparatus. As FIG. 1 shows, the post-process apparatus
comprises a waiting tray 10, a processing tray 12, a stapler 14, a
first storage tray 16, and a second storage tray 18.
[0037] The sheet post-process apparatus further comprises a pair of
input rollers 22, a pair of sheet-feeding rollers 24, and an
input-roller motor 26. The input rollers 22 receive a sheet 20
supplied from an MFP and convey the sheet 20 to the sheet-feeding
rollers 24. The sheet-feeding rollers 24 convey the sheet 20 to the
waiting tray 10. The input-roller motor 26 drives the input rollers
22.
[0038] One of the input rollers 22 is an upper input roller 22a,
and the other input roller 22 is a lower input roller 22b.
Likewise, one of the sheet-feeding rollers 24 is an upper
sheet-feeding roller, and the other sheet-feeding roller 24 is a
lower sheet-feeding roller.
[0039] The waiting tray 10 comprises two tray parts 10a and 10b.
The tray parts 10a and 10b can move from left to right, and vice
versa. When the tray parts 10a and 10b take a closed position, the
waiting tray 10 can receive sheets. Waiting-tray rollers 28, a
waiting-roller drive 30 and a waiting-roller motor 32 are provided.
The waiting-tray rollers 28 align sheets on the tray parts 10a and
10b while both tray parts remain in the closed position. The
waiting-tray rollers 28 can move up and down when they are driven
and controlled by the waiting-roller drive 30. The waiting-roller
motor 32 rotates the waiting-tray rollers 28.
[0040] When the number of sheets 20 stacked on the waiting tray 10
reaches a prescribed value, a waiting-tray motor 34 drives the
waiting-tray parts 10a and 10b to an opened position as is
illustrated in FIG. 3. The sheets 20 fall onto the processing tray
12, due to gravity. This event is known as "active drop."
[0041] The sheet post-process apparatus has a paper guide 36, which
guides sheets from the MFP to the waiting tray 10 and thence to the
processing tray 12. The paper guide 36 has a paper-pass
ceiling.
[0042] In the processing tray 12, the sheets are aligned at the
longitudinal edges and the transverse edges. The sheets are aligned
at their longitudinal edges by a longitudinal-alignment mechanism
38 as is illustrated in FIG. 4. More precisely, an upper
longitudinal-alignment motor 40 drives the upper
longitudinal-alignment rollers 38a of the mechanism 38, and a lower
longitudinal-alignment motor 42 drives the lower
longitudinal-alignment rollers 38b of the mechanism 38. Driven by
the motors 40 and 42, the rollers 38a and 38b move the sheets until
one longitudinal edge of every sheet abuts on a stopper 45. Paddles
44 are provided to facilitate the longitudinal alignment. A paddle
motor 46 drives the paddles 44.
[0043] The sheets are aligned at their transverse edges, too, as is
illustrated in FIG. 5. More specifically, the transverse alignment
is performed by a transverse-alignment mechanism 47 and a
transverse-alignment motor 48.
[0044] When the number of sheets thus aligned in the processing
tray 12 reaches the prescribed value, the stapler 14 starts
operating. The stapler 14 is positioned as depicted in FIG. 6 and
controlled by a stapler-driving unit 49.
[0045] Controlled by the unit 49, the stapler 14 staples the sheets
together, forming a bundle of sheets. As shown in FIG. 4, a
transport mechanism 50 transports the bundle of sheets to the first
storage tray 16. Either the first storage tray 16 or the second
storage tray 18 is selected when a storage-tray driving unit 52
(FIG. 2) moves the tray 16 or 18 to a predetermined upper
position.
[0046] As FIG. 3 shows, a gap A is provided between the lower
surface 64 of the waiting tray 10 and the nip 66 between
sheet-feeding rollers 24a and 24b.
[0047] If the gap A were not provided, a lower sheet 19 conveyed to
the waiting tray 10 and curled should close the nip between the
sheet-feeding rollers 24a and 24b as shown in FIG. 7A. This would
cause jamming of sheets or would change the order in which the
sheets are conveyed. Further, as shown in FIG. 7B, the lower sheet
19 conveyed to the waiting tray 10 and curled should be held near
the sheet-feeding rollers 24a and 24b and could not fall smoothly
onto the processing tray 12.
[0048] How the post-process apparatus according to this invention
operates will be explained with reference to FIGS. 8 to 18.
[0049] As FIG. 8 shows, a sheet 20 conveyed from the MFP is moved
from the input rollers 22 to the sheet-feeding rollers 24, in the
direction of the arrow.
[0050] As is illustrated in FIG. 9, the sheet 20, or the first
sheet, is placed on the waiting tray 10. Then, the waiting-tray
rollers 28 move down, in the direction of the arrow, aligning the
trailing edge of the first sheet 20 at the rear (i.e., upstream)
end 60 of the waiting tray 10.
[0051] As FIG. 10 depicts, the waiting-tray rollers 28 moves up to
receive the second sheet 20a.
[0052] As FIG. 11 shows, the second sheet 20 is conveyed to the
waiting tray 10. The waiting-tray rollers 28 move down, aligning
the trailing edge of the second sheet 20a at the rear end 60 of the
waiting tray 10. Thus, a bundle 20b of two sheets 20 and 20a is
formed in the waiting tray 10.
[0053] As FIG. 12 shows, the waiting-tray rollers 28 move upwards.
Then, the waiting-tray parts 10a and 10b move to the opened
position as is illustrated in FIG. 3. The active drop is therefore
performed as shown in FIG. 13. The bundle 20b is conveyed to the
processing tray 12.
[0054] Thereafter, the third sheet 20c and some following sheets
are conveyed from the sheet-feeding rollers 24 to the processing
tray 12, not through the waiting tray 10 as shown in FIG. 14. These
sheets are laid, one after another, upon the bundle 20b of two
sheets. A bundle 21, which consists of the prescribed number of
sheets, is formed on the processing tray 12. As the sheets
including the third sheet 20 are sequentially laid on the bundle
20b, the longitudinal-alignment rollers 38 and the
transverse-alignment mechanism 47 align the sheets at their
longitudinal edges and transverse edges.
[0055] The waiting tray 10 must be positioned so that its rear end
60 may lie downstream of the rear end (upstream-side) of the
processing tray 12 when the sheets are laid on the bundle 20b. As
shown in FIG. 14, the rear end 60 of the waiting tray 10 is
therefore spaced from the rear end 62 of the processing tray 12, by
distance L, in the transverse direction. This enables the bundle
20b to fall smoothly from the waiting tray 10 onto the processing
tray 12. This also makes it easy for both alignment mechanisms 38
and 47 to align sheets. Thus, jamming of sheets can be
prevented.
[0056] It is desired that the waiting tray 10 and the processing
tray 12 be inclined, having their upstream ends at a lower position
than their downstream ends. In other words, they should be so
positioned that their rear ends 60 and 62 lie at the lowest
position. If the trays 10 and 12 are so inclined, the sheets 20 are
aligned, due to gravity, at the rear end 60 of the waiting tray 10,
and the bundle 20b can be aligned, due to gravity, at the rear end
and 62 of the processing tray 12.
[0057] As seen from FIGS. 11 to 14, the sheet post-process
apparatus has the following three characterizing features: [0058]
(1) The waiting tray 10 extends longer in the sheet-conveying
direction than the length of sheets 20. [0059] (2) The processing
tray 12 extends shorter in the sheet-conveying direction than the
length of sheets 20. [0060] (3) Because of the feature (2), any
sheet 20 that has fallen from the waiting tray 10 onto the
processing tray 12 is supported not only by the processing tray 12,
but also by the first storage tray 16.
[0061] These features (1), (2) and (3) reduce the size of the sheet
post-process apparatus (i.e., finisher) in the sheet-conveying
direction.
[0062] As FIG. 15 shows, the stapler 14 staples the bundle 21 of
sheets. Then, the transport mechanism 50 transports the bundle 21
to the storage tray 16 as illustrated in FIG. 16. Thus, the
post-process ends.
[0063] If the sheets need not undergo the post-process, they are
not conveyed to the processing tray 12. They are ejected from the
waiting tray 10 onto the first storage tray 16 as shown in FIGS. 17
and 18. As FIG. 17 shows, the sheets supplied from the MFP are
sequentially conveyed to the first storage tray 16 via the input
rollers 22, sheet-feeding rollers 24 and waiting tray 10. The
waiting-tray rollers 28 move down, serving to convey sheets 20. As
depicted in FIG. 18, the storage-tray driving unit 52 lifts the
first storage tray 16 a little and receives the sheets coming from
the waiting tray 10.
[0064] One embodiment of the invention has been described. The
invention is not limited to the embodiment, nevertheless. The
components described above may be replaced with other components
that are identical in function.
* * * * *