U.S. patent application number 11/200839 was filed with the patent office on 2006-04-06 for device for separation and feeding of sheets of a recording carrier.
This patent application is currently assigned to BDT AG.. Invention is credited to Bernd Bantle, Ralf Koehler.
Application Number | 20060071398 11/200839 |
Document ID | / |
Family ID | 34983201 |
Filed Date | 2006-04-06 |
United States Patent
Application |
20060071398 |
Kind Code |
A1 |
Koehler; Ralf ; et
al. |
April 6, 2006 |
Device for separation and feeding of sheets of a recording
carrier
Abstract
For separation and feeding of sheets of the recording carrier,
these sheets are supplied stacked in a cassette. An advance head
(18) sits on the stack with advance rollers (20), which is mounted
on the free end of a pivotable arm (22). In order to be able to
insert the cassette accommodating the stack and remove it, a
release mechanism is provided that is operated by the cassette. For
this purpose, the arm (22) is mounted on a slide (28) that is
pulled into a release position by tension springs (32). A pusher
(44) is also provided on the slide (28) that raises the arm (22)
under spring force. With the cassette, an operating pin (58) is
inserted into the release mechanism. The pin (58) pushes the slide
(28) against the force of spring (32), into the operating position
of arm (22) and pushes the pusher (44) into a position that
releases the arm (22) for lowering onto the stack.
Inventors: |
Koehler; Ralf;
(Wellendingen, DE) ; Bantle; Bernd;
(Schramberg-Waldmoessingen, DE) |
Correspondence
Address: |
BAKER BOTTS L.L.P.;PATENT DEPARTMENT
98 SAN JACINTO BLVD., SUITE 1500
AUSTIN
TX
78701-4039
US
|
Assignee: |
BDT AG.
|
Family ID: |
34983201 |
Appl. No.: |
11/200839 |
Filed: |
August 10, 2005 |
Current U.S.
Class: |
271/117 |
Current CPC
Class: |
B65H 3/0684 20130101;
B65H 1/04 20130101 |
Class at
Publication: |
271/117 |
International
Class: |
B65H 3/06 20060101
B65H003/06 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 10, 2004 |
DE |
10 2004 038 971.3 |
Claims
1. A device for separation and feeding of sheets of a recording
carrier, with a cassette insertable into a receiving space, which
receives the sheets in an essentially horizontal stack and has a
rising slope, on which the stack lies with its edge facing the free
direction, with an arm mounted to pivot on an inside wall of the
receiving space and protruding above the stack of the inserted
cassette, with an advance head arranged on the free end of the arm,
which can be lowered onto the stack by pivoting of the arm and
raised from the stack, with at least one advance roller mounted in
the advance head, which sits on the uppermost sheet of the stack
when the advance head is lowered and can be driven, in order to
push the uppermost sheet up for separation on the slope, and with a
release mechanism that raises the arm from the stack when the
cassette is moved from the receiving space, and which is operated
by the cassette inserted into the receiving space, in order to
release the arm for lowering onto the stack, wherein the arm is
mounted to pivot on a slide that is arranged movable on the inside
wall essentially parallel to the surface of the stack, and is moved
away from the slope by a spring force, a pusher is arranged
moveable on a slide, which engages on the arm and is biased by a
spring force in a position that raises the arm, and wherein at
least one operating protrusion arranged in a cassette acts on the
slide during insertion of the cassette and moves it against the
spring force against the slope and acts on the slide and moves it
against the spring force into the position that releases the
arm.
2. A device according to claim 1, wherein the operating protrusion
is formed as a pin protruding from a cassette in the insertion
direction, which acts on the slide and pusher via wedge
surfaces.
3. A device according to claim 2, wherein the slide has a passage
opening for the pin, and a wedge surface is formed in the passage
opening, which the pin encounters during insertion into passage
opening, in order to move the slide against the spring force.
4. A device according to claim 2, wherein the pin has a conical tip
that penetrates the operating opening and produces the wedge effect
for movement of the pusher.
5. A device according to claim 4, wherein the operating opening is
formed in a thrust plate mounted to move on the slide, and which
can be made to cover the passage opening of the slide, and wherein
the thrust plate is connected to the pusher via a pivotable
lever.
6. A device according to claim 5, wherein the lever is designed as
a two-arm lever and converts the pushing path of the thrust plate
to a larger pushing path of the pusher.
7. A device according to claim 1, wherein the arm, together with a
parallel rod, forms a parallel guide for the advance head, the
parallel rod is lengthened beyond its bearing on the slide, and
wherein the pusher engages on this lengthened end of the parallel
rod.
8. A device according to claim 7, wherein the lengthened end passes
through an elongated hole of the pusher, is freely movable in this
elongated hole in the release position and is entrained by the end
of the elongated hole when the pusher is moved into the position
that raises the arm under the spring force.
9. A device for separation and feeding of sheets of a recording
carrier, comprising: a cassette insertable into a receiving space,
which receives the sheets in an essentially horizontal stack and
has a rising slope, on which the stack lies with its edge facing
the free direction, an arm mounted to pivot on an inside wall of
the receiving space and protruding above the stack of the inserted
cassette, arranged movable on the inside wall essentially parallel
to the surface of stack, and is moved away from the slope by a
spring force a pusher arranged moveable on a slide, which engages
on the arm and is biased by a spring force in a position that
raises the arm, an advance head arranged on the free end of the
arm, which can be lowered onto the stack by pivoting of the arm and
raised from the stack, at least one advance roller mounted in the
advance head, which sits on the uppermost sheet of the stack when
the advance head is lowered and can be driven, in order to push the
uppermost sheet up for separation on the slope, and a release
mechanism that raises the arm from the stack when the cassette is
moved from the receiving space, and which is operated by the
cassette inserted into the receiving space, in order to release the
arm for lowering onto the stack, and at least one operating
protrusion arranged in a cassette that acts on the slide during
insertion of the cassette and moves it against the spring force
against the slope and acts on the slide and moves it against the
spring force into the position that releases the arm.
10. A device according to claim 9, wherein the operating protrusion
is formed as a pin protruding from a cassette in the insertion
direction, which acts on the slide and pusher via wedge
surfaces.
11. A device according to claim 10, wherein the slide has a passage
opening for the pin, and wherein a wedge surface is formed in the
passage opening, which the pin encounters during insertion into
passage opening, in order to move the slide against the spring
force.
12. A device according to claim 10, wherein the pin has a conical
tip that penetrates the operating opening and produces the wedge
effect for movement of the pusher.
13. A device according to claim 12, wherein the operating opening
is formed in a thrust plate mounted to move on the slide, and which
can be made to cover the passage opening of the slide, and wherein
the thrust plate is connected to the pusher via a pivotable
lever.
14. A device according to claim 13, wherein the lever is designed
as a two-arm lever and converts the pushing path of the thrust
plate to a larger pushing path of the pusher.
15. A device according to claim 9, wherein the arm, together with a
parallel rod, forms a parallel guide for the advance head, the
parallel rod is lengthened beyond its bearing on the slide, and
wherein the pusher engages on this lengthened end of the parallel
rod.
16. A device according to claim 15, wherein the lengthened end
passes through an elongated hole of the pusher, is freely movable
in this elongated hole in the release position and is entrained by
the end of the elongated hole when the pusher is moved into the
position that raises the arm under the spring force.
17. A method for separation and feeding of sheets of a recording
carrier, comprising the steps of: providing a cassette insertable
into a receiving space, which receives the sheets in an essentially
horizontal stack and has a rising slope, on which the stack lies
with its edge facing the free direction, providing an arm mounted
to pivot on an inside wall of the receiving space and protruding
above the stack of the inserted cassette, arranged movable on the
inside wall essentially parallel to the surface of stack, and is
moved away from the slope by a spring force providing a pusher
arranged moveable on a slide, which engages on the arm and is
biased by a spring force in a position that raises the arm,
providing an advance head arranged on the free end of the arm,
which can be lowered onto the stack by pivoting of the arm and
raised from the stack, providing at least one advance roller
mounted in the advance head, which sits on the uppermost sheet of
the stack when the advance head is lowered and can be driven, in
order to push the uppermost sheet up for separation on the slope,
and providing a release mechanism that raises the arm from the
stack when the cassette is moved from the receiving space, and
which is operated by the cassette inserted into the receiving
space, in order to release the arm for lowering onto the stack, and
providing at least one operating protrusion arranged in a cassette
that acts on the slide during insertion of the cassette and moves
it against the spring force against the slope and acts on the slide
and moves it against the spring force into the position that
releases the arm.
18. A method according to claim 17, wherein the operating
protrusion is formed as a pin protruding from a cassette in the
insertion direction, which acts on the slide and pusher via wedge
surfaces, and wherein the slide has a passage opening for the pin,
and a wedge surface is formed in the passage opening, which the pin
encounters during insertion into passage opening, in order to move
the slide against the spring force.
19. A method according to claim 7, wherein the arm, together with a
parallel rod, forms a parallel guide for the advance head, the
parallel rod is lengthened beyond its bearing on the slide, and
wherein the pusher engages on this lengthened end of the parallel
rod.
20. A method according to claim 19, wherein the lengthened end
passes through an elongated hole of the pusher, is freely movable
in this elongated hole in the release position and is entrained by
the end of the elongated hole when the pusher is moved into the
position that raises the arm under the spring force.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority to German Patent
Application No. 10 2004 038 971.3, which was filed on Aug. 10,
2004, and is incorporated herein by reference in its entirety.
TECHNICAL FIELD
[0002] The invention concerns a device for separation and feeding
of sheets of a recording carrier.
BACKGROUND
[0003] A device of this type is known from DE 199 50 307 C1. In
this known device, the sheets of the recording carrier are supplied
in a cassette as an essentially horizontal stack. The cassette is
pushed into a receiving space, for example, of an office machine or
sheet feeder for an office machine. An advance head with a drivable
advance roller lies on the stack, which pushes the uppermost sheet
of the stack against a rising slope of the cassette, so that the
front edge of the sheet runs up the slope and is separated from the
next sheet of the stack. The uppermost sheet so separated is then
grasped by the transport device and fed to the office machine, for
example, a printer, copier or the like. The advance head is mounted
on a free end of an arm, mounted to pivot on an inside wall of the
receiving space and extending across the feed direction over the
stack. The advance head can follow the diminishing height of the
stack by means of the pivotable arm.
[0004] In order to be able to pull out the cassette from the
receiving space and push it back into the receiving space, for
example, when the cassette is changed or is to be loaded with a new
stack of sheets, the arm with the advance head must be raised, so
that the cassette can be pulled out beneath the advance head and,
if necessary, pushed back in again with a new stack beneath the
advance head. For this purpose, the known device has a release
mechanism with a lift lever. The lift lever is pivoted by the
pushed-in cassette, so that it releases the arm and this can be
lowered onto the stack. If the cassette is pulled out, it releases
the lift lever and this is pivoted under the influence of a spring,
so that it raises the arm with the advance head. The release
mechanism causes only lifting of the arm with the advance head
upward. This lifting is not sufficient in those cases when the
advance head is situated right against the slope of the cassette
with the advance roller, on which the stack comes in contact with
its front edge.
SUMMARY
[0005] The underlying object of the invention is to improve a
device of the type just mentioned, so that the arm with the advance
head guarantees greater free space for removal and insertion of the
cassette.
[0006] This object can be solved by a device for separation and
feeding of sheets of a recording carrier, with a cassette
insertable into a receiving space, which receives the sheets in an
essentially horizontal stack and has a rising slope, on which the
stack lies with its edge facing the free direction, with an arm
mounted to pivot on an inside wall of the receiving space and
protruding above the stack of the inserted cassette, with an
advance head arranged on the free end of the arm, which can be
lowered onto the stack by pivoting of the arm and raised from the
stack, with at least one advance roller mounted in the advance
head, which sits on the uppermost sheet of the stack when the
advance head is lowered and can be driven, in order to push the
uppermost sheet up for separation on the slope, and with a release
mechanism that raises the arm from the stack when the cassette is
moved from the receiving space, and which is operated by the
cassette inserted into the receiving space, in order to release the
arm for lowering onto the stack, wherein the arm is mounted to
pivot on a slide that is arranged movable on the inside wall
essentially parallel to the surface of the stack, and is moved away
from the slope by a spring force, a pusher is arranged moveable on
a slide, which engages on the arm and is biased by a spring force
in a position that raises the arm, and wherein at least one
operating protrusion arranged in a cassette acts on the slide
during insertion of the cassette and moves it against the spring
force against the slope and acts on the slide and moves it against
the spring force into the position that releases the arm.
[0007] The operating protrusion can be formed as a pin protruding
from a cassette in the insertion direction, which acts on the slide
and pusher via wedge surfaces. The slide may have a passage opening
for the pin, and a wedge surface can be formed in the passage
opening, which the pin encounters during insertion into passage
opening, in order to move the slide against the spring force. The
pin may have a conical tip that penetrates the operating opening
and produces the wedge effect for movement of the pusher. The
operating opening can be formed in a thrust plate mounted to move
on the slide, and which can be made to cover the passage opening of
the slide, and the thrust plate can be connected to the pusher via
a pivotable lever. The lever can be designed as a two-arm lever and
may convert the pushing path of the thrust plate to a larger
pushing path of the pusher. The arm, together with a parallel rod,
may form a parallel guide for the advance head, the parallel rod
can be lengthened beyond its bearing on the slide, and the pusher
may engage on this lengthened end of the parallel rod. The
lengthened end may pass through an elongated hole of the pusher,
may be freely movable in this elongated hole in the release
position and can be entrained by the end of the elongated hole when
the pusher is moved into the position that raises the arm under the
spring force.
[0008] In the device according to the invention, the arm with
advanced head is mounted to pivot on a slide guided on the inside
wall of the receiving space, parallel to the surface of the stack.
A pusher is mounted on this slide, which engages on the arm, in
order to raise it or release it for lowering. The arm can therefore
not only be raised upward by the slide, but can also be moved away
from the slope by means of the slide. The slide is then biased by
spring force, so that it is moved away from the slope, and the
pusher is biased by spring force, so that it raises the arm. If the
cassette is pulled out from its operating position in the receiving
space, the arm is raised, on the one hand, by the spring-loaded
pusher, and moved away from the slope, on the other hand, by the
spring-loaded slide. The arm and the advance head come into a
position on this account, in which they are reliably moved out
fully from the movement path of the cassette and any sheet stack
accommodate in the cassette. Unhampered pulling out and reinsertion
of the cassette is possible. The cassette has at least one
operating protrusion, with which it engages with the release
mechanism when the cassette is pushed into its operating position.
The operating protrusion, in the first place, moves the slide
against the slope, and, in the second place, moves the pusher
against its spring load into the position, in which the pusher
releases the arm for lowering.
[0009] The operating protrusion is preferably designed as a pin
arranged on the outside of the cassette facing the insertion
direction of the cassette and protrudes from the cassette in this
insertion direction. When the cassette reaches its operating
position during insertion, this pin penetrates into the slide,
during which the axial penetration movement of the pin is converted
via a wedge surface into the displacement movement of the slide
against its spring bias. The pin acts further during insertion via
a wedge surface on the pusher, in order to move it against its
spring force.
[0010] It is readily apparent that two separate operating
protrusions, for example, pins, can be used for displacement of the
slide and pusher. In a preferred variant, the same pin is used,
both for displacement of the slide and the pusher, during which
this pin acts on the slide and pusher in succession during its
axial movement.
[0011] In an expedient variant, the slide is movable on guide rods.
For mounting on the guide rods, the slide has a certain material
thickness. The wedge surface is then expediently made on the slide,
in which the wedge surface guarantees sufficient displacement
movement of the slide, because of the material thickness.
[0012] For movement of the pusher, a lever transmission is
preferably used, so that a slight axial movement of the pin is
converted to a larger displacement path of the pusher. The wedge
surface for conversion of the axial path of the pin to the
displacement path can be designed for this purpose as a conical tip
of the pin.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The invention is further explained below by means of a
practical example depicted in the drawing. In the drawing:
[0014] FIG. 1 schematically depicts the device with the cassette
pulled out.
[0015] FIG. 2 schematically depicts the device with the cassette
insert.
[0016] FIG. 3 shows the device with the cassette pulled out, in
which only the pin for operation of the cassette is shown.
[0017] FIG. 4 shows a view corresponding to FIG. 3 during
engagement of the pin in the release mechanism.
[0018] FIG. 5 shows a view corresponding to FIG. 3 with the
completely inserted cassette.
[0019] FIG. 6 shows a view corresponding to FIG. 5, in which the
housing of the release mechanism is removed.
[0020] FIG. 7 shows the device in the position of FIG. 3, viewed
from the outside, in which the housing of the release mechanism is
removed.
[0021] FIG. 8 shows the device in the position of FIG. 6, viewed
from the outside.
[0022] FIG. 9 schematically depicts a top view of the device with
the cassette pulled out.
[0023] FIG. 10 shows a view corresponding to FIG. 9, with the
cassette insert.
[0024] FIG. 11 shows an outside view of operation of the pusher
with the cassette pulled out.
[0025] FIG. 12 shows a front view of the device in the position of
FIG. 11.
[0026] FIG. 13 shows an outside view of operation of the pusher
with the cassette inserted.
[0027] FIG. 14 shows a view corresponding to FIG. 12, with the
cassette inserted.
DETAILED DESCRIPTION
[0028] In order to supply an office machine, for example, a
printer, copier or the like, with sheets of a recorded carrier, for
example, paper sheets, these sheets are supplied in stack 10. The
stack 10 of sheets is accommodated essentially horizontally in a
cassette 12 that is inserted into the receiving space of the
device. The receiving space can be formed in the office machine
itself or in a separate sheet feeder that can be mounted or added
on to the office machine. Only an inside wall 14 of the receiving
space is shown in the drawing.
[0029] The cassette 12 has a slope 16 on its front side facing the
feed direction of the sheets, which rises at an angle of about
20-25.degree., with reference to the vertical on the stack surface.
The stack 10 lies with its front edge facing the feed direction on
this slope 16. An advance head 18 is positioned on the uppermost
sheet of stack 10, which engages frictionally with drivable advance
rollers 20 on the uppermost sheet of stack 10. The driven advance
rollers 20 push the uppermost sheet of stack 10 with its front edge
against slope 16, so that the front edge of the uppermost sheet
rises on slope 16 and is separated from the next sheet of stack 10,
so that it can be fed separately to further transport to the office
machine. The advance head 18 is mounted on the free end of an arm
22 that is mounted to pivot on inside wall 14 in a pivot plane
parallel to the plane of slope 16. Since the arm 22 is freely
pivotable, the advance head 18 lies freely on the uppermost sheet
of stack 10 under the weight of the advance head 18 and arm 22 and
can follow the changing height of stack 10. The advance rollers 20
are movable in the advance head 18 against a spring force in the
plane of stack 10. Owing to arrangement of arm 22 and advance head
18 and the spring bias of the advance rollers 20, these advance
rollers 20 lie on the front end of the uppermost sheet in the feed
direction and lie against the slope 16 with a certain spring bias,
when the advance rollers 20 are not driven.
[0030] As is apparent from FIGS. 1 and 2, the cassette 12 is pushed
horizontally into the receiving space, perpendicular to inside wall
14. In order to be able to push cassette 12 with a stack 10 into
the receiving space or pull the inserted cassette out of the
receiving space, the arm 22 with advance head 18 must be raised
from stack 12 and cassette 12 far enough, that sufficient free
space for removal and insertion of the cassette is formed. FIG. 1
shows the arm 22 raised in this way with advance head 18, in which
the cassette 12 is partially withdrawn. FIG. 2 shows the completely
inserted cassette 12 with the lowered arm 22 and the advance head
18 sitting on stack 10. In the operating position depicted in FIG.
2, the sheets can be removed separately from stack 10 and fed to
the office machine.
[0031] It is explained below how arm 22, with advance head 18, is
raised automatically according to the invention, when the cassette
12 is removed from the receiving space, and lowered automatically
onto stack 10, when the cassette 12 is inserted into the receiving
space.
[0032] A release mechanism is arranged on the inside wall of the
receiving space. The release mechanism is accommodated in a housing
24, fastened with appropriate fastening devices 26 to the inside
wall 14 of the receiving space.
[0033] A slide 28, guided to move on two guide bars 30, is arranged
on housing 24. The guide bars 30 are mounted parallel to each other
and at a spacing in housing 24, so that they run parallel to the
inside wall 14 and parallel to the surface of stack 10. Tension
springs 32 are fastened on one end to slide 28 and on the other end
to housing 24 and pull the slide 28 on guide bars 30 in the
direction pointing away from slope 16. The arm 22 is mounted to
pivot on the surface of slide 28 facing the receiving space by
means of an obliquely positioned bearing axis 34, perpendicular to
the pivot plane of arm 22. A parallel rod 36 is also arranged
beneath arm 22 and parallel to it, which is mounted to pivot with a
bearing 38 on slide 28. The parallel rod 36 is pivotable in the
same pivot plane as arm 22 and forms, with arm 22, a parallel guide
lying in the pivot plane that causes the advance head 18 to be
moved up and down parallel during pivoting of arm 22.
[0034] Beneath guide rods 30, the slide 28 has a passage opening 40
that passes through slide 28, perpendicular to its plane, i.e.,
perpendicular to inside wall 14. The passage opening 40 is designed
on its inside wall, directed against slope 16 with a wedge surface
42, that is most clearly visible in the depiction of FIGS. 9 and
10. The wedge surface 42 is arranged perpendicular to the plane of
stack 10 and sloped, so that the passage opening 40 tapers from its
inlet side facing the receiving space for cassette 12 toward the
side facing inside wall 14.
[0035] A pusher 44 is arranged on the surface of slide 28 facing
inside wall 14, which is guided to move on this surface of slide 28
in the pivot plane of arm 22 and parallel rod 36. The pusher 44 has
an elongated hole 46 running in its displacement direction, which
is penetrated by an end 48 of parallel rod 36, lengthened beyond
bearing 38. On the lower end of pusher 44, a tension spring 50
engages, whose other end is fastened to slide 28. The tension
spring 50 pulls the pusher 44 into its lower end position. On the
lower end of the pusher 44, one arm of a two-arm lever, mounted to
pivot on slide 28, is connected. The other arm of lever 52 is
connected to a thrust plate 54, guided to move parallel to pusher
44 on the surface of slide 28. The thrust plate 54 has continuous
operating openings 56, perpendicular to the plane of slide 28,
which can be brought to cover the outlet side of passage opening 40
facing the inside wall 14.
[0036] Cassette 12 has, on its outside, which faces the inside wall
14 during insertion of cassette 12 into the receiving space, a pin
58 that protrudes in the insertion direction. The pin is designed
essentially cylindrical and has a conically rounded tip 60.
[0037] If no cassette 12 is situated in the receiving space or the
cassette is only partially inserted into the receiving space, the
device assumes the position depicted in FIGS. 3, 7, 9, 11 and 12.
The slide 28 is pulled by tension springs 32 on guide rods 30 in
the direction opposite the sheet feed direction. Because of this,
the arm 22 and advance head 18 mounted on slide 28 are pulled away
from slope 16. The tension spring 50 pulls the pusher 44 downward.
The end 48 of the parallel rod 36 reaches the upper end of
elongated hole 46 and is entrained by the pusher 44 and pulled
downward. The parallel rod 36, and with it arm 22, are pivoted up,
so that the advance head 18 is raised. A cassette 12, possibly with
stack 10, can now be pulled out unhampered from the receiving space
by arm 22 with advance head 18, or inserted into the receiving
space.
[0038] If the cassette 12 is pushed further into the receiving
space from the position depicted in FIGS. 3, 7 and 9, the pin 58,
with its tip 60, initially reaches passage opening 40 through an
opening 62 of housing 24. Since the slide 28 is retracted by the
tension springs 32, the tip 60 of pin 58 encounters the sloped
wedge surface 42. On further insertion of pin 58 into the passage
opening 40, the tip 60 of pin 58 presses against the wedge surface
42 and, in so doing, pushes the slide 28 against the force of
tension springs 32, so that the arm 22 mounted on the slide 28 is
moved with the advance head 18 against the slope 16. This position
is shown in FIG. 4. As soon as the pin 58 has fully penetrated the
passage opening, the slide 28 reaches its inserted end position
against the slope 16. The tip 60 of pin 58 now encounters the side
of slide 29 facing inside wall 15 from the passage opening 40 and
enters the operating opening 56 of thrust plate 54. As is apparent
in FIG. 11, the operating opening 56 is initially pushed against
the passage opening 40, because the tension spring 50 has also
moved the thrust plate 54 via lever 52. On further advance of pin
58, its conical tip 60 encounters the operating opening 56. The pin
58, because of the wedge effect of its conical tip 60, moves the
thrust plate 54 against the force of tension spring 50, acting via
lever 52, until pin 58 has fully penetrated the operating opening
56 and is axially flush with the passage opening 40. This position,
with the fully inserted cassette 12, is shown in FIGS. 5, 6, 8, 10,
13 and 14.
[0039] In this end position, the thrust plate 54 has pushed slide
54 upward against the force of tension spring 50 via lever 52, and
the elongated hole 46 is also pushed upward on this account, so
that the end 48 of parallel rod 36 can now move freely in elongated
hole 46. The arm 22, with the advance head 18, can now be lowered
onto stack 10 of the cassette, freely pivotable under its own
weight.
[0040] If, during lowering of advance head 18, its advance rollers
20 come in contact with the slope 16 and cassette 12, the advance
rollers 20 roll along this slope 16, until they lie on the
uppermost sheet of stack 10. In this case, a bias of the springs,
acting on the advance rollers 20 in advance had 18, is
produced.
[0041] The process runs in reverse, when the cassette 12 is removed
from the inserted position. During removal of cassette 12, pin 58
is initially pulled out from the operating opening 56 of the thrust
plate 54. The thrust plate 54 is released and the tension spring 50
can pull the pusher 44 downward. The pusher 44 then engages on the
end 48 of parallel rod 36, pulls this end downward, so that the arm
22, with advance head 18, is raised. On further removal of the
cassette 12, the pin 58 is also removed from the passage opening 40
of slide 28. Because of this, slide 28 is also released and the
tension springs 52 can pull the slide and, with it, the arm 22 with
advance head 18, away from the slope 16, so that the cassette 12 is
fully released and can be removed unhampered from the receiving
space.
* * * * *