JP3492976B2 - Sheet post-processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a sheet post-processing device that performs post-processing on a sheet. [0002] 2. Description of the Related Art For example, an image of a copying machine, a printer body, etc.
Placed next to forming equipment and discharged from this equipment
The image-formed sheets are stacked on the processing tray, and
A sheet post-processing device that binds and punches bundles and discharges them
There is a place. Such an apparatus will be briefly described with reference to FIG.
I do. FIG. 7 shows the inside of the apparatus main body 2 of the sheet post-processing apparatus 1.
Although simply shown, the sheet post-processing apparatus 1 is used for copying.
Provided adjacent to the image forming apparatus G such as the machine body and the pudding body
Have been. The apparatus main body 2 is discharged from the image forming apparatus G.
Receiving port 3 to which the formed image-formed sheet S is supplied
And a discharge port 4 formed on a surface opposite to the reception port 3
In order to stack the discharged sheets,
And a stacking tray 5 protruding therefrom. Also, body 2
Staple unit rotatably mounted on one side
6 is provided. In addition, there is a receiving port inside the main body 2.
And a first conveyance path 7 for guiding the sheet S from the inside to the inside.
The second transport path from the first transport path 7 to the discharge port 4 directly
8 and a step between the second conveying path 8 and the conveying method.
The sheet S is conveyed into the processing tray 11 with the direction reversed.
The third transport path 9 branches off from the middle of the first transport path 7.
To transport the sheet S to a second discharge port (not shown)
A road 10 is provided. [0004] The first conveying path 7 is supplied from the receiving port 3.
The fed sheet S is further advanced in cooperation with the driven roller 12.
Drive roller 13 for conveying to
The sheet S conveyed by the conveyor belt is further forward.
14 and the fourth transport path 10
Rotary flapper 1 that switches the route when guiding
5 is provided. The transport belt 14 is a driven roller
The sheet S is conveyed to the second conveying path 8 in cooperation with the sheet 16. What
The transfer belt 14 is made of a rubber endless belt.
The belt drive roller 17 fixed to the drive shaft 17a.
Therefore, it is rotated. [0005] Below the conveyor belt 14, the above processing
A tray 11 is provided. This processing tray 11 has an image
Bundling and binding multiple formed sheets
When performing post-processing, the sheets S are temporarily stacked and
It is a tray for getting. Also, above the second transport path 8
Is driven by the rotation of the paddle drive roller 18.
Rubber paddle 20 provided on a paddle rotating shaft 19
And a rotating arm 21. The rotating arm 21
And a driven roller 2 on the free end side of the rotating arm 21.
2 are provided. Then, the rotating arm 21 is turned.
The sheet S after stapling is located at the position where
Drive roller for discharging the bundle of sheets to the collecting tray 5
23. Note that the rotating arm 21 and the
The position is displaced from the dollar 20 in a direction perpendicular to the paper surface of FIG.
When the rotating arm 21 rotates, the paddle
There is no such thing as 20 getting in the way. Also, the above processing
A processing tray is provided at the end of the third transfer path 9 on the tray 11.
11a to stop the end of the sheet S sent to the sheet 11
Is provided on the side of the processing tray 11 in the conveying direction of the sheet S.
To move the sheet S in the direction perpendicular to
Plywood 24 is provided. The operation of the sheet post-processing apparatus 1 will be described.
You. Sheet S supplied to the first transport path 7 from the receiving port 3
Without post-processing such as stapling
In this case, the flapper 15 is rotated to transport the sheet S for the fourth time.
It is guided to the feed path 10 and discharged to the second stacking tray. On the other hand, post-processing such as stapling is performed.
In this case, the sheet S is transferred from the first conveying path 7 to the conveying belt 1.
The paper is conveyed to the second conveyance path 8 through the fourth conveyance path 8. Rear end of sheet S
Is released from the conveyor belt 14, the paddle 20 is rotated.
Then, the sheet S is transferred along the third transport path 9 to the processing tray 11.
Transport on top. The rear end of the sheet S on the second conveyance path 8
When the sheet S comes off the second roller 14, the sheet S is conveyed.
The leading end side in the feeding direction is fed from the discharge drive roller 23 to the collecting tray.
I'm on the side. Pad so that this sheet S is pushed back
20 operates. Sheet S pushed back by paddle 20
Travels along the third transport path 9 and the leading end in the transport direction
When inserted between the belt 14 and the processing tray 11,
The end is stopped by the rotation of the conveyor belt 14.
It is transported until it hits the par 11a. Stopper 11a
The sheet S, which stops after hitting the
Align the sides in the width direction. Thereafter, one bundle of sheets to be stapled is processed.
The sheet S is processed for several minutes in the same procedure as above.
It is conveyed to the tray 11 and loaded. A predetermined number of sheets S are processed.
When the staple units 6 are aligned on the
Is moved, and the bundle of sheets S is stapled. This state
In the state, the bundle of sheets S is driven for discharge from the processing tray 11.
It is extended to the roller 23. A bundle of sheets S is bound
Then, rotate the rotating arm 21 and set it at the tip
Between the driven roller 22 and the discharge drive roller 23
By rotating the pinching and discharging drive roller 23, the sheet
The bundle is discharged from the discharge port 4 to the collecting tray 5. [0009] As described above, the stay
In order to perform the pull binding process, the sheet S is transferred to the third conveyance path 9.
Must be transported along. In this third transport path 9
Along the sheet S to the stopper 11a of the processing tray 11.
The transporting means is a transport belt 14. This transport
The default 14 is a backup tray on the processing tray 11 side.
Flexible endless rubber belt
You. The transport belt 14 has flexibility because of the processing tray.
8 when the number of stacked sheets S on the sheet 11 increases.
So that the bundle of sheets S can enter under it
That is to ensure. [0010] However, the transport belt 14 is
8, the larger the number of sheets stacked on
As a result, the contact area with the sheet S increases.
As a result, the frictional force increases, and as a result, the transport force also increases.
It becomes. That is, the stacked sheets of the sheet S on the processing tray 11
Depending on the number, the conveyance force to the stopper 11a side changes,
When the number of stacked sheets increases, the transfer power is too strong.
I will. Strong conveyance force of conveyance belt 14 to processing tray 11
If too long, the leading end of the sheet S hits the stopper 11a
Is pushed further in the transport direction.
Therefore, the leading end of the sheet S may buckle. this
Such buckling of the sheet S may cause the sheet S to wrinkle.
Or the position of the sheet S conveyed and stacked on it
Or cause it to be damaged. If the processing trays are not aligned,
A sheet to be discharged onto the stacking tray after binding
Each sheet S is irregular and dirty.
U. On the other hand, the width of the sheet bundle is
It is aligned by the moving alignment plate 24 (see FIG. 7).
That is, the sheet S is conveyed onto the processing tray 11
The position in the width direction is shifted from the predetermined position
If there is, the matching plate 24 moves to a predetermined position.
Be moved. Thus, the sheet S moves in the width direction.
And the conveyor belt 14 in contact with the upper surface of the sheet S
Also shifts with the movement of the sheet S. Conveyor belt 14
Is a rubber belt, and a back is provided on the processing tray 11 side.
Since there is no up, the sheet S is twisted by the movement
Sometimes If the conveyor belt is twisted
When the corner of the belt hits the sheet S,
The S surface will be scratched. In addition, the twisted belt
If it is restored by elasticity, the sheet that is in contact with it
Drag S to move the whole or make wrinkles
I do. Therefore, such a sheet post-processing apparatus 1 is used.
Ejects the sheet S with scratches or wrinkles on the surface
Will be. Therefore, an object of the present invention is to provide a processing tray
Even if the number of stacked sheets increases, scratches and wrinkles
Without having to create a sheet bundle
It is to provide a sheet post-processing apparatus. [0013] SUMMARY OF THE INVENTION The present invention relates to an image forming apparatus.
Tray for stacking stacked sheets, and
A transport path that guides the sheet and this transport pathThrough the steps
A processing tray provided,Between the transfer path and the processing tray
Along withOn the above processing trayWith the above-mentioned accumulation tray
Is in the opposite directionSheet feeding means for feeding a sheet, and the above processing
End for stopping the leading edge of the sheet sent to the tray in the traveling direction
Section regulating means and a direction orthogonal to the sheet conveying direction.so
The width direction of the above sheetGo tohand, The above processing tray
Width adjustment member to make the width of the sheet inside, The above processing tray
For discharging the sheets stacked on the stacking tray
Steps andIt is assumed that a sheet post-processing apparatus provided is provided. On the premise of the above device, the first invention
The sheet feeding means,DriveOn the axisInstalled drive roller
When,A side plate swingably provided on the drive shaft,
Driven by being supported by this side plate
A support roller spaced a predetermined distance from the roller,
Roller and the above supporting rollerEndless belt passed over
And a part of the endless belt,
Configuration that can be placed at the position where it contacts the top sheet insideDo
And between the transport path and the processing tray,
On the side of the side plate opposite the support roller,
A sheet balance portion, and the sheet
To reduce the contact pressure againstCharacteristic point
You. [0015] 1 to 3 show a first embodiment of the present invention.
1 shows a part of a post-processing device of an embodiment. After the seat of the first embodiment
The processing apparatus is the same as the conventional sheet post-processing apparatus shown in FIG.
The conveying belt 14 is moved to the sheet feeding roller 3 shown in FIG.
It has been changed to 0. Otherwise, the conventional device
Therefore, use Fig. 7 to explain the whole device.
To The sheet feed roller 30 shown in FIG.
Of the transport belt 14 shown in FIG.
Instead, it is attached to the drive shaft 17a. Therefore, the sheet feed roller 30
Transfers the sheet S supplied to the first transport path 7 to the second transport path 8
And at the same time, reverse the traveling direction of the sheet S.
To transport the inside of the processing tray 11 along the third transport path 9
Has functions. Note that the rotation direction of the drive shaft 17a is
This is indicated by arrow A. The feed roller 30 is shown in FIG.
As described above, the belt driving roller 17 and the driving roller 1
7 and an outer periphery of the support roller 31 at a predetermined interval.
The dressing belt 32 is hung over the rollers 1
A pair of side play so that the gap between 7, 31 is maintained
And 33 are provided. The endless belt 32 is a rubber belt.
The surface has irregularities on the surface. In fact, this
The protrusions of the irregularities of
Push the rear side of the sheet S and drop it on the processing tray 11
The sheet S on the processing tray 11 toward the stopper 11a.
Or transport it once. The side plate 3
A support shaft 31a is fixed between the support shafts 3 and 33.
The support roller 31 is rotatably attached to 1a.
I have. When the drive shaft 17a rotates, the drive roller
17, the endless belt 32 is supported
It moves while rotating the roller 31. [0018]Also, The pair of side plates 33,
In 33, hook concave portions 33a, 33a are formed, and
Hook the recesses 33a, 33a over 17a and press
Ports 33, 33 so that they can swing around the drive shaft 17a.
ing. Thus, the side plates 33, 33
Is not fixed to the drive shaft 17a.
Even if 7a rotates, the side plates 33, 33 rotate.
Never. The side plates 33, 33
And the support roller 31 attached between them
Swings around the drive shaft 17a as a body.In addition,
On opposite sides of the support rollers 31 of the guide plates 33, 33
Form a weight balance portion 34. This way
The light balance unit 34 is configured such that the feed roller 30
1 or a pressing force for pressing the sheets S stacked thereon
This is for reducing. The feed roller 30 shown in FIG.
Endless belt 32 on the upper surface of the processing tray 11
It is attached to the drive shaft 17a so that it contacts. This
In addition to the feed roller 30, a drive shaft 17a
A roller 35 is also attached. Note that in FIG.
Shows the driven roller 16 apart, but in actuality,
These driven rollers 16 include a sheet feed roller 30,
The sheet can be conveyed with the sheet S sandwiched between the driving roller 35 and the driving roller 35.
It is provided in the place. Then, the feed roller 30 and
Transported by the drive roller 35 and the driven roller 16.
The sheet S to be transported is transported in the direction of the second transport path 8 indicated by the arrow.
Between the feed roller 30 and the processing tray 11.
The sheet S is transported along the conveyance path 9 to the stopper 11a.
Conveyed in the direction. A system provided with the feed roller 30 as described above
The operation of the post-processing apparatus will be briefly described. However, the image
The sheet S discharged from the forming apparatus G is stapled.
Route of sheet S when post-processing such as binding is not performed
AboveConventional exampleIs exactly the same as
The case where the binding is performed will be described. First, the entrance
The sheet S is supplied to the first transport path 7 via the third transport path 3. No.
The transport drive roller 13 and the driven roller 12 in one transport path 7
As a result, the sheet S is fed to the feed roller 30. The sheet S includes a feed roller 30 and a driven roller
16 and is transported toward the second transport path 8
You. The trailing end of the sheet S is the feed roller 30 and the driven roller 16
When it comes off the nip,
The convex portion of the dress belt 32 pushes the rear end of the sheet S,
The sheet S is placed on the processing tray 11 from above the feed roller 30.
Drop. At this point, the leading side of the sheet S is
It rests on the moving roller 23. Next, above the discharge drive roller 23,
A certain paddle 20 is rotated to transfer the sheet S to the third conveying path 9.
Transport along. Sheet S conveyed by paddle 20
Is inserted under the feed roller 30, this time,
Transported by the endless belt 32 of the feed roller 30
It is. The sheet S advances until it hits the stopper 11a.
After that, the width is adjusted by the matching plate 24. This
, The convex portion on the endless belt 32
Causes a conveying force to act on the sheet S. Note that the storage
The opening 11a is an end regulating means of the present invention,
Is a width matching member of the present invention. After that, specify
The number of sheets S is stacked on the processing tray 11. Then, when a predetermined number of sheets S have been prepared,
Activate the staple unit 6 to bind the sheet bundle
You. When stapling is completed, rotate the rotating arm 21
Driven by the driven roller 22 and the discharge drive roller 23.
To discharge the sheet bundle. In addition, the discharge drive roller
The sheet bundle is discharged by the roller 23 and the driven roller 22.
At this time, the feed roller 30 is in a free rotation state,
It can be made to follow the discharge direction of the sheet bundle
And retract it upward using a mechanism (not shown).
It does not matter. In the case of the sheet post-processing apparatus according to the first embodiment,
If the number of sheets stacked on the processing tray 11 is large,
Then, the contact portion of the feed roller 30 with the uppermost sheet is
It is lifted by the thickness of the sheet S. That is,
The roller 30 swings about the drive shaft 17a. this
The swing direction is opposite to the rotation direction A of the drive shaft 17a.
is there. The endless belt 3 of the feed roller 30
2 is backed up by the support roller 31
Therefore, it swings according to the number of sheets on the processing tray 11.
However, even if the number of stacked sheets S on the processing tray 11 increases,
It does not deform like the conventional conveyor belt 14. Accordingly
Then, depending on the number of sheets stacked on the processing tray 11,
The contact area does not change. That is, the sheet
The conveyance force changes or is too strong depending on the number of S loaded
Or not. Therefore, the product on the processing tray 11
Even if the number of loaded sheets increases, the stopper 11a
To further buckle the sheet S
There is no. Further, the endless belt 32 is
Backed up by the matching plate 24,
When the belt S moves, the endless belt 32
There is no such thing as twisting. Therefore, the conventional example
Like, scratching the seat surface with the corner of the twisted belt,
The sheet may move or wrinkle due to the return force of the twisted belt.
You don't even drop. It should be noted that the sheet S
The weight of the swinging member acts as the pressing force.
Was too strong, the sheet S had wrinkles
May cause the tip to buckle. So this
In the first embodiment, in order to reduce the pressing force, the way
A balance 34 is provided.Normally, Like the conventional example
Compared with the conveyor belt 14, the endless belt 32 is
By providing a swinging member for raising
Pressing force applied toBut the way as above
The torque can be adjusted by the balance 34
You. As a result, the pressing force of the feed roller 30 can be adjusted to be small.
Wear. Further, in the first embodiment, the endless
The surface of the belt 32 is orthogonal to the transport direction of the sheet S.
Irregularities are formed in the direction. However, transport the above convex part
By forming the sheet S obliquely with respect to the direction,
The transport direction can be adjusted. For example,
Roller 30 in the width direction of sheet S
Depending on the position of the matching plate 24,
The endless belt 32 has a conveying force parallel to the conveying direction.
, The traveling direction of the sheet S bends
Sometimes. Therefore, the surface of the endless belt 32
By changing the direction of the unevenness, the stopper 11a
To the edge of the sheet.
You. FIG. 4 shows a second embodiment of the present invention.
The member is composed of a support member 36 and a support roller 3 attached thereto.
7 is different from the first embodiment in that
Other configurations are the same as those of the first embodiment. The support member 3
6 has one end swingably attached to the drive shaft 17a.
And supported at a position spaced from the drive shaft 17a
The roller 37 is rotatably supported. And the drive shaft
17a and the supporting roller 37
At the same time, wrap the endless belt and configure the feed roller.
To achieve. The feed roller constructed as described above is used in the first embodiment.
Similarly to the feed roller 30 of the embodiment, the product on the processing tray 11 is
Regardless of the number of loaded sheets, the sheet S
Can be transported. Therefore, it hit the stopper 11a.
The buckled sheet S does not buckle. Also, sheet S
If the belt moves in the width direction,
There is no twist. Therefore, the sheet S may be damaged
Does not wrinkle. The third embodiment shown in FIGS.
The swinging member that backs up 2 has no rollers
It is. A pair of plates 38 and 39
Therefore, the space is maintained and the drive shaft 17a is provided to be swingable.
Have been. For such a swing member and the drive roller 17,
A feed roller is formed by hanging the endless belt 32
I do. In the case of the feed roller of the third embodiment, the drive roller
When the roller 17 rotates, the endless belt 32 moves as shown in FIG.
It moves in the direction of the arrow, at which time the endless belt 3
2 slides on the outer periphery of the plates 38 and 39 to move.
You. Other configurations are the same as those of the first and second embodiments.
You. Also in the third embodiment, the processing tray 1
1, when the sheet S is conveyed, the number of stacked sheets S
Even if it increases, the conveying force increases, causing the sheet S to buckle.
Scratches and wrinkles due to belt twisting
Never. Therefore, each sheet S has no scratches or wrinkles.
The bundle of sheets that have been neatly arranged onto the stacking tray 5
be able to. Sheet post-processing apparatus of the first to third embodiments
When the post-processing is not performed, the sheet S is transferred to the fourth conveying path.
10 and discharged from a second discharge port (not shown).
However, the fourth transport path 10 need not be provided.
No. In that case, the sheet without post-processing,
That is, the sheet not stacked on the processing tray 11 is
The paper is directly discharged from the path 8 to the collecting tray 5. The above
In the embodiment, the sheet bundle stacked on the processing tray is scanned.
The case of stapling has been described.
Is not limited to stapling,
Yes, in all cases where a stack of sheets is
It is effective. [0035] 【The invention's effect】The inventionAccording to the sheet on the processing tray
Stacking sheets on the processing tray when stacking
Even if the number of sheets increases, the sheet feeding means
A well-aligned sheet bundle without creating scratches or wrinkles
Can be discharged. In particular,On the side plate of the sheet feeding means
By providing a balance weight,Inside the processing tray
The contact pressure of the sheet feeding means on the sheet
As a result, excessive pressing force and conveying force can be prevented from acting.
Therefore, the seat does not buckle or wrinkle
No.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sheet feed roller according to a first embodiment. FIG. 2 is a structural explanatory view of a sheet feed roller of the first embodiment. FIG. 3 is a view near the processing tray of the first embodiment. FIG. 4 is a diagram illustrating a swing member of a sheet feed roller according to a second embodiment. FIG. 5 is a diagram illustrating a swing member of a sheet feed roller according to a third embodiment. FIG. 6 is a side view of a sheet feed roller in which a belt is stretched around the swing member of FIG. 5; FIG. 7 is an internal explanatory view of a conventional sheet post-processing apparatus. FIG. 8 is an internal explanatory view of a conventional sheet post-processing apparatus, showing a state in which a large number of sheets are stacked on a processing tray. DESCRIPTION OF REFERENCE NUMERALS 1 sheet post-processing apparatus 2 apparatus main body 5 stacking tray 11 processing tray 17 belt drive roller 17a drive shaft 30 sheet feed roller 31 support roller 31a support shaft 32 endless belt 33 side plate 34 weight balance 36 support member 37 support Rollers 38, 39 Plate 40 Support shaft

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 31/34 B65H 29/18 B65H 37/04

Claims (1)

(57) [Claim 1] An accumulation tray for accumulating sheets on which images are formed, a conveyance path for guiding the sheets to the accumulation tray ,
A processing tray provided via a step on the conveying path, the transportable
A sheet feeding means for feeding the sheet to the opposite direction to the stacking tray on said processing tray while located between the processing tray sending passage, the end portion regulating halt the progression direction leading end of the sheet fed into the processing tray and means, in a direction perpendicular to the conveying direction of the sheet moving in a width direction of the sheet, and the width aligning member for aligning the width of the sheet in the processing tray, the sheets stacked on the processing tray above Collection
And a discharge means for discharging the product tray, said sheet feeding means comprises a drive roller mounted on the drive shaft, the drive shaft
Side plate that is swingably mounted on the
The drive roller and the predetermined
A support roller with an interval, the drive roller and the support
And a endless belt passed over to the roller, a portion of the endless belt, as well as to be placed in a position in contact with the uppermost sheet in the processing tray, the conveying path
And the processing tray, and above the side plate
A weight balance section is formed on the opposite side of the support roller
And reduce the pressing force of the sheet feeding means on the sheet.
A sheet post-processing device configured to perform