JPH05147815A - Post-handling apparatus for sheet - Google Patents

Abstract

PURPOSE:To registrate respective sheets in the transport direction at the same time and surely so as to improve the post-handling quality of sheets by registrating the respective sheets simultaneously stacked on an post-handling plate in the individual transport directions by the first and second registrating means. CONSTITUTION:The first and second sheets simultaneously discharged on a plate 46 for a staple plate are clamped between rollers 53, 54 by following the rotation in the direction F2 of an arm member 55, and under such a condition, a discharge roller 53 is rotated in the direction G2, thereby the first sheet can be registrated in the transport direction. A puddler 48 is rotated in the direction of C to registrate the second sheet in the transport direction. Accordingly, two sheets stacked in two, upper and lower layers on the plate 46 for a staple are individually registrated in the transport direction surely so as to surely maintain the binding quality of sheets.

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 apparatus which is provided in an image forming apparatus such as a copying machine or a laser beam printer and which performs post-processing such as binding or punching on a copied sheet.

[0002]

2. Description of the Related Art Conventionally, an image forming apparatus such as a copying machine for copying an image of an original on a sheet is disclosed in, for example, Japanese Patent Laid-Open No. 2-144.
As disclosed in Japanese Unexamined Patent Publication No. 370, there are some which are equipped with a sheet post-processing device for binding a plurality of sheets. As shown in FIG. 13A, such a sheet post-processing apparatus aligns and stacks the copied sheets S conveyed from the machine body 71 side on the stapling plate 72, and then incorporates them. The stapler 73 binds with staples to perform bookbinding, and the bound sheet S is sandwiched between the ejection roller 74 and the driven roller 75, and the ejection tray 76.
It is designed to discharge above.

Further, in the above-mentioned sheet post-processing apparatus, first and second conveyances having different path lengths are provided between the carry-in port 77 of the sheet S opened on the machine body 71 side and the stapling plate 72. The paths 78a and 78b are formed,
A deflector 79 is disposed at a branch point of the first and second transport paths 78a and 78b to move the sheet S to the first transport path.
It is adapted to switch to either the transport path 78a or the second transport path 78b. Incidentally, the above-mentioned first transport path 7
8a has a longer path length than the second conveyance path 78b, and is joined again to the second conveyance path 78b on the downstream side. At the trailing end of this path, the sheet S is stapled from inside the path. Ejecting Roller 8 for Ejecting Paper on Plate 72
0 is set.

When binding a plurality of sets, the sheet post-processing apparatus performs a predetermined bookbinding process on the first sheet S on the stapling plate 72, as shown in FIG. 13 (a). While the vehicle is moving, the next first sheet S ₁ conveyed from the machine body 71 side is conveyed on the first conveying path 78a, while the second sheet S ₂ is conveyed on the second conveying path 78b. Thus, as shown in FIG. 13B, in the state where the sheets S ₁ and S ₂ are overlapped with each other, the sheet is discharged from the sheet discharge roller 80 on the stapling plate 72 in synchronization, and the first sheet The time loss of the bookbinding time on the sheet S is gained and the speed is increased. The sheets S ₁ and S ₂ synchronously discharged onto the staple plate 46 are discharged.
When the sheet S is sandwiched between the rollers 74 and 75, the discharge roller 74 is rotated in the direction opposite to that when the sheet S is discharged, so that the sheets S are aligned in the transport direction.

[0005]

However, each of the sheets S ₁ .S on the stapling plate 72 is different from the conventional one as described above.
_{In the} sheet post-processing apparatus that earns a time loss of the bookbinding time by synchronously ejecting ₂ in the case of binding a plurality of copies, it is possible to speed up the bookbinding process, but each of the synchronously ejected sheets S _{When 1} and S ₂ are aligned in the transport direction, these sheets S ₁ and S ₂ are sandwiched between the discharge roller 74 and the driven roller 75, and the discharge roller 74 is rotated in the reverse direction for alignment. However, in such an aligning operation, the upper and lower two sheets S ₁ and S ₂ cannot be reliably aligned in the transport direction, and as a result, the bookbinding quality of the sheets S is deteriorated. I have a problem.

[0006]

In order to solve the above-mentioned problems, the sheet post-processing apparatus according to the first aspect of the present invention takes the following means.

That is, the first and second sheets carried in from the image forming apparatus are synchronously stacked on the post-processing plate, and the sheets on the post-processing plate are subjected to predetermined post-processing and discharged. A sheet post-processing device for ejecting onto a tray, wherein the post-processing plate has a first aligning means for aligning a first sheet in a transport direction and a second aligning means for aligning a second sheet in a transport direction. And means are provided individually.

In order to solve the above-mentioned problems, the sheet post-processing apparatus according to the second aspect of the invention has the following means in the sheet post-processing apparatus of the first aspect.

That is, the first aligning means comprises reverse driving of the discharge roller for discharging the sheets stacked on the post-processing plate, and the second aligning means has the blade portion on the post-processing plate. It consists of driving the abutted paddler.

In order to solve the above-mentioned problems, the sheet post-processing apparatus according to the third aspect of the invention has the following means in the sheet post-processing apparatus of the second aspect.

That is, above the discharge roller, a driven roller capable of sandwiching the sheet with the discharge roller and releasing the sheet is disposed.

[0012]

According to the structure of the first aspect, the sheets stacked in synchronization on the post-processing plate are individually aligned in the transport direction by the first and second aligning means. Therefore, the alignment of each sheet in the transport direction is performed simultaneously and reliably,
As a result, the post-processing quality of the sheet can be reliably maintained.

According to the second aspect of the present invention, the first sheet is aligned by the reverse drive of the discharge roller, while the second sheet is aligned by the drive of the paddler.
Therefore, the discharge roller for discharging the sheet from the post-treatment plate can be used together as the first aligning means, so that the number of parts and the cost can be reduced.

According to the structure of claim 3, the first
When the sheets are aligned by the second aligning means, by sandwiching these sheets between the discharge roller and the driven roller, the alignment of the sheets can be further improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS.
The explanation will be given below based on (a), (b) and (c). In this embodiment, the sheet post-processing apparatus is applied to a copying machine as an image forming apparatus.

As shown in FIG. 1, the copying machine according to the present embodiment has a machine body 1 for copying an image of a document M onto a sheet S, and the machine body 1 is provided on top of the machine body 1. A document transport device 30 that transports the document M is provided on the exposure unit 2 formed on the upper end surface of the document.

An exposure glass 3 forming an exposure portion 2 is arranged at the upper end of the machine body 1 and this exposure glass 3 is provided.
An optical system 9 including a light source lamp 4, mirrors 5, 6 and 7, and a lens 8 and a photoconductor drum 10 are disposed below. Then, the optical system 9 optically scans the document M conveyed to the exposure unit 2 by the document conveying device 30 described later by the light emitted from the light source lamp 4, and the reflected light is reflected by the mirrors 5 and 6. By irradiating the exposure point A on the surface of the photoconductor drum 10 via 7 and the lens 8, the surface of the photoconductor drum 10 uniformly charged by the main charger unit 11, which will be described later, is statically charged according to the image of the document M. It is designed to form a latent image.

Around the photosensitive drum 10, a main charger unit 11 for charging the surface of the photosensitive drum 10 to a predetermined potential and a developing unit 12 as described above.
A transfer charger 13 and a peeling charger 14 are provided. The electrostatic latent image formed on the surface of the photoconductor drum 10 is developed as a toner image by the developing unit 12, and then this toner image is transferred. The charger 13 transfers the sheet S to a sheet S conveyed through a sheet conveying path 15 described later. The peeling charger 14 peels the sheet S to which the toner image is transferred from the photosensitive drum 10.

A sheet conveying path 15 for conveying the sheet S for transferring the toner image is provided below the photosensitive drum 10. On the upstream side of the sheet conveying path 15, there are provided a paper feed table 19 having paper feed rollers 16, 17, and 18, a paper feed cassette 20, and a paper feed deck 21, respectively. Sheets S placed or accommodated on the table 19, the paper feed cassette 20, and the paper feed deck 21
Are fed to the photosensitive drum 10 through the sheet conveying path 15. On the other hand, on the downstream side of the sheet conveyance path 15, a conveyance belt 22 that conveys the sheet S onto which the toner image has been transferred and a fixing device 23 that fixes the toner image onto the sheet S are arranged.

On the downstream side of the fixing device 23, the sheet S is conveyed in the sheet post-processing device 40, which will be described later, and the re-conveyance path 2.
A deflector 24 is provided to branch to the 5 and 5. The re-conveyance path 25 forms a circulation path for re-conveying the sheet S onto which the toner image has been transferred by the photoconductor drum 10 to the photoconductor drum 10, and an intermediate tray 26 is arranged in the middle of the path so that the sheet S is transferred to the sheet S. It enables double-sided copying.

The original document conveying device 30 has an original document conveying path 31 for conveying the original document M to the exposure section 2 formed on the upper end surface of the machine body 1. The original document conveyance path 31 forms a circulation path, and an original document tray 32 for stacking the original documents M and the original documents M stacked on the original document tray 32 are sequentially fed to the exposure unit 2 in the path. A feeding belt 33 for sending,
A conveyor belt 34 that is provided in contact with the exposure glass 3 that forms the exposure unit 2 and that forms a conveyance path for the document M with the exposure glass 3 is provided. Then, the document feeder 3
In the case of 0, the original M on the original tray 32 is fed to the exposure unit 2 by the feeding belt 33, and the original M is positioned at a predetermined position on the exposure glass 3 by the conveying belt 34, so that the above-mentioned light source lamp is provided. The document M is arranged in a state of being optically scanned by 4.

Further, in the copying machine of this embodiment, the sheet post-processing device 40 is arranged on the downstream side of the above-mentioned sheet conveying path 15.

As shown in FIG. 2, the sheet post-processing apparatus 40 aligns the sheet S with the post-processing conveyance path 41 for conveying the sheet S conveyed from the machine body 1 in the apparatus 40 and staples the sheets. Post-processing means 45 for performing bookbinding processing by
And a discharge unit 51 for discharging the bound sheet S from the inside of the apparatus 40, and a discharge tray 56 on which the sheet S discharged from inside the apparatus 40 is placed.

The post-processing conveyance path 41 is formed at one end thereof with a carry-in entrance 41a for carrying in the sheet S conveyed from the machine body 1, and is bifurcated in the middle of the path so as to have two upper and lower stages. Bypass 41b and main pass 41c
And are formed. Further, the post-processing conveyance path 41 is
At each end of the bypass 41b and the main path 41c,
A pair of upper and lower conveying rollers 42 and 43 are provided, respectively, and a deflector 44 as a path switching unit that is rotatable in the B ₁ -B ₂ direction is provided at a branch point between the bypass 41 b and the main path 41 c. Then, the conveyance path of the sheet S is switched to either the bypass 41b or the main path 41c.

Further, as shown in FIG. 3, the post-processing conveyance path 41 is provided with sheet detection switches SW ₁ and SW ₂ for detecting the sheet S in the middle of each of the bypass 41b and the main path 41c. By the detection operation of each sheet S by the sheet detection switches SW ₁ and SW ₂ , drive control of the transport roller 43 as described later is performed.

The post-processing means 45 comprises a staple plate 46 as a post-processing plate, a width plate 47, a paddler 48 as a second aligning means, and a stapler 49.

One end of the staple plate 46 is disposed in the discharge port 40a formed on the exterior surface of the apparatus 40, and the other end of the staple plate 46 is slanted downward as compared with the one end so that the post-processing conveyance is performed. The sheets S to be bound (stapled) are stacked at a position below the path 41. A sheet detection switch (not shown) is provided on the staple plate 46 to detect the presence or absence of the sheet S on the staple plate 46.

The width plate 47 is a staple plate 46.
Of the staple plate 46. The staple plate 46 is disposed in the substantially central portion of the
The upper sheet S is aligned in the width direction. The paddle 48 has a blade portion for the staple plate 46.
The sheet S on the staple plate 46 is aligned in the conveyance direction while being disposed in contact with the upper surface of the lower end of the stapler and rotatably provided in the C direction. The stapler 49 is arranged at a lateral position of the staple plate 46 with which the paddler 48 is abutted, and binds the sheets S stacked on the staple plate 46 with staples to perform bookbinding. A stopper 50 is provided on the lower end side of the stapling plate 46, and the stopper 50 positions the rear end of the sheets S stacked on the stapling plate 46, so that the paddler 48 operates. It is adapted to assist the alignment of the sheet S in the transport direction.

The discharging means 51 includes a pushing member 52, a discharging roller 53 as a first aligning means, and a driven roller 54.
It consists of and.

The extruding member 52 is arranged on the extension line of the lower end of the stapling plate 46, and is provided so as to be able to move back and forth in the D ₁ -D ₂ direction along the upper surface of the stapling plate 46. The S is pushed out from the staple plate 46 toward the discharge port 40a. The rotation axis of the discharge roller 53 is rotatably supported by the upper end portion of the staple plate 46 and is rotatable in the G ₁ -G ₂ directions. On the other hand, the driven roller 54
Of the arm member 55 is pivotally supported on one end side of the arm member 55, and the other end side of the arm member 55 is provided so as to be rotatable about the fulcrum E in the F ₁ -F ₂ directions. .. Then, the discharge roller 53 discharges the sheet S to the discharge tray 56 by rotating in the G ₁ direction in each of staple and offset modes described later.
Further, at this time, the driven roller 54 clamps the sheet S with the discharge roller 53 by rotating the arm member 55 in the F ₂ direction in accordance with the rotation of the discharge roller 53 in the G ₁ direction. It is supposed to do. The discharge roller 5
3 is adapted to align the sheets S stacked on the stapling plate 46 in the conveying direction by rotating in the G ₂ direction in the staple mode, and as shown in FIG. A sheet detection switch S for detecting the sheet S in the contact state with the roller 54.
It is designed to make up W ₃ .

The discharge tray 56 is attached to the apparatus 40 at a position below the discharge roller 53, and the elevator unit 57 and the shift unit 5 are provided near the attachment portion.
8 is provided so as to be able to move back and forth in the H ₁ -H ₂ direction which is the vertical direction and the direction orthogonal to the paper surface of FIG. 2, and the tray position is adjusted according to the sheet S to be supported. It has become so.

In the above structure, the sheet S conveying process in the sheet post-processing apparatus 40 will be described below. In the following description, the offset mode in which the sheets S conveyed from the machine body 1 are sequentially discharged one by one to the discharge tray 56 without post-processing, and the sheets S conveyed from the machine body 1 are sequentially processed. After performing the bookbinding post-processing, a staple (single) mode in which only one copy of the sheet S (hereinafter referred to as a bookbinding sheet S) is discharged to the discharge tray 56, and the sheet S conveyed from the machine body 1 After the bookbinding post-processing is performed, a plurality of copies of the bookbinding sheet S are sequentially discharged to the discharge tray 56 in a staple (multi) mode.

First, in the offset mode, as shown in the flowchart of FIG. 5, when the sheet post-processing device 40 receives the offset number from the machine body 1 (S1), the offset number is set in the device 40 (S2). ). Next, when the device 40 receives an operation start from the machine body 1 (S3), a start process is performed (S4), and the number of processed sheets is cleared (S5).

After that, the sheet S on which the image of the original M is copied by the machine body 1 is carried into the apparatus 40 through the carry-in port 41a, and after passing through the main path 41c, each roller 5 is moved.
It is sandwiched between 3 and 54 and discharged to the discharge tray 56.
At this time, the sheet S is the sheet detection switch SW.
The _second ON state transport in the main path 41c is detected (S6), also, the ON state (S7) of the sheet detection switch SW _3, and the transport and passage of between the rollers 53, 54 by the OFF state (S8) Is detected and the number of processed sheets is increased (S9).

Next, it is judged whether or not the number of processed sheets increased as described above matches the number of offset sheets (S1).
0). When the number of processed sheets does not match the offset number of sheets in S10, the process returns to S6 again. On the other hand, when the processed number matches the offset number, the processed number is cleared (S
11) Then, the discharge tray 56 is sequentially lowered (S12), offset (S13), and raised (S14).

Then, it is judged whether or not there is an end reception from the machine body 1 to the device 40 (S15). If there is no end reception, the process returns to S6 again, while if there is an end reception, end processing is performed. (S16), the offset mode as described above is terminated.

Next, in the staple (single) mode, as shown in the flowchart of FIG. 6, when the sheet post-processing device 40 receives the number of staples from the machine body 1 (S21), the number of staples is set in the device 40. (S22). Next, when the device 40 receives an operation start from the machine body 1 (S23), a start process is performed (S24), and the number of processed sheets is cleared (S25).

Thereafter, the sheet S on which the image of the original M is copied in the machine body 1 is carried into the apparatus 40 through the carry-in port 41a, passes through the main path 41c, and is discharged onto the stapling plate 46. To be paper. At this time, the sheet S described above, the sheet detection switch SW ₂ in the ON state (S2
6) and the OFF state (S27), the main path 41
The conveyance in c is detected, and thereby the timer of the apparatus 40 is cleared (S28), and the number of processed sheets is increased (S29). Then, when the predetermined time set by the above timer has elapsed (S30), it is determined that the sheet S on the stapling plate 46 has been discharged,
The sheet S on the staple plate 46 is aligned in the width direction by the widthwise plate 47 (S31).

Next, it is judged whether or not the number of sheets processed as above is equal to the number of staples (S3).
2). When the number of processed sheets does not match the offset number of sheets in S32, the process returns to S26 again. On the other hand, when the number of processed sheets matches the number of stapled sheets, the number of processed sheets is cleared (S33), and then the sheet S on the staple plate 46 rotates the paddler 48 in the C direction and G of the discharge roller 53. The rotation in _two directions aligns the sheets in the conveyance direction, and the staples of the stapler 49 are stapled and stapled (S34).

[0040] Then, the bookbinding sheet S which stapling processing has been performed as described above is extruded advancing movement in the D ₁ direction member 52, and the staple plate upper 46 by the rotation of the G ₁ direction of the discharge roller 53 From the discharge tray 56
(S35). Then, after the discharge tray 56 is adjusted (S36), when the device 40 receives the operation end from the machine body 1 (S37), the ending process is performed (S38), and the staple (single) as described above is performed. The mode ends.

Next, in the staple (multi) mode, as shown in the flow charts of FIGS.
When the sheet post-processing device 40 receives the number of staples from the machine body 1 (S41), the number of staples is set in the device 40 (S42). Next, when the device 40 receives an operation start from the machine body 1 (S43), a start process is performed (S44), and the number of processed sheets is cleared (S45).

After that, the sheet S on which the image of the original M is copied in the machine body 1 is carried into the apparatus 40 through the carry-in port 41a, passes through the main path 41c, and is discharged onto the stapling plate 46. To be paper. At this time, the sheet S described above is conveyed in the main path 41c by the ON state of the sheet detection switch SW ₂ is detected (S46), then whether or not the sheet detection switch SW ₂ is turned OFF is determined (S47 ).

If the sheet detection switch SW _{2 is} still ON in S47, the process proceeds to S48, in which it is determined whether or not the bookbinding sheet S has been discharged from the stapling plate 46. If the bookbinding sheet S is not yet ejected from the stapling plate 46 in S48, the bookbinding sheet S is ejected to the ejection tray 56 by the pushing member 52 and the ejection roller 53 (S49), and the process returns to S47 again. On the other hand, the binding sheet S from the staple plate 46
If is discharged, the process proceeds to S50 and the discharge tray 5
It is determined whether or not 6 has been adjusted. If the discharge tray 56 has been adjusted in S50, the process directly returns to S47, while if the discharge tray 56 has not been adjusted, the discharge tray 56 is adjusted (S51) and the process returns to S47. When the OFF state of the sheet detection switch SW ₂ is detected in S47, the timer of the apparatus 40 is cleared accordingly (S52), and the number of processed sheets is increased (S5).
3).

Next, it is determined whether or not the number of sheets processed as above is the first sheet (S54). S54
If the number of processed sheets is not the first, then S66, which will be described later,
On the other hand, when the number of processed sheets is the first, the process proceeds to S55, and it is determined whether or not the preparation of the stapling plate 46 is OK. Staple plate 4 at S55
If No. 6 is prepared, the process proceeds to S66. If no staple plate 46 is prepared, the rotation of the carry roller 43 is stopped, and the carrying of the first sheet S is stopped. (S56), and also the deflector 4
4 is rotated in the B ₁ direction, and the conveyance path of the sheet S is switched to the bypass 41b (S57).

Next, whether or not the second sheet S is conveyed to the bypass 41b is determined by the sheet detection switch SW.
It is determined by detecting the ON state of ₁ (S58).
In S58, if the sheet detection switch SW ₁ has not been turned on yet, the process proceeds to S59, and it is determined whether or not the bookbinding sheet S has been discharged. If the bookbinding sheet S is not yet ejected from the staple plate 46 in S59, the bookbinding sheet S is ejected to the ejection tray 56 by the pushing member 52 and the ejection roller 53 (S6).
0), while returning to S58 again, staple plate 4
6 If the bookbinding sheet S is ejected from above, S61
Then, it is determined whether or not the discharge tray 56 has been adjusted.
If the discharge tray 56 has been adjusted in S61, the direct S
On the other hand, when the discharge tray 56 has not been adjusted, the discharge tray 56 is adjusted (S62) and the process returns to S58. When the ON state of the sheet detection switch SW ₁ is detected in S58, the sheet detection switch S ₁ is then detected.
When the OFF state of W ₁ is detected (S63), the deflector 44 is rotated in the B ₂ direction, the conveyance path of the sheet S is switched to the main path 41c (S64), and the conveyance roller 43 is rotated. Then, the conveyance of the first sheet S is restarted (S65). As a result, the first sheet S passing through the main path 41c and the second sheet S passing through the bypass 41b are discharged onto the staple plate 46 in synchronization.

Then, the process returns to S52 again, the timer of the apparatus 40 is cleared, and the number of processed sheets is increased (S
53), and then proceeds to S54. If it is determined in S54 that the number of processed sheets is not the first, then the process proceeds to S66, in which it is determined whether or not the predetermined time set by the above timer has elapsed. Then, when a predetermined time has elapsed, it is determined that the sheet S on the staple plate 46 has been discharged, and the sheet S on the staple plate 46 is aligned in the width direction by the width plate 47 (S67). , It is determined whether the number of processed sheets S matches the number of staples (S68). If the number of processed sheets does not match the number of staples in S68, the process returns to S46 again. on the other hand,
If the number of sheets to be processed matches the number of sheets to be stapled, the number of sheets to be processed is cleared (S69), then the sheet S on the staple plate 46 is rotated in the C direction of the paddler 48,
Also, the discharge roller 53 is rotated in the G ₂ direction to be aligned in the transport direction, and is stapled by a staple of the stapler 49 (S70).
Then, it returns to S46 again.

When the sheet detection switch SW ₂ no longer detects the sheet S in S46, the process proceeds to S71, in which it is determined whether or not the bookbinding sheet S has been discharged.
In S71, when the bookbinding sheet S is not yet discharged from the staple plate 46, the bookbinding sheet S is discharged by the pushing member 52 and the discharge roller 53.
When the bookbinding sheet S is discharged from the staple plate 46, the process proceeds to S73, and it is determined whether the discharge tray 56 has been adjusted. If the discharge tray 56 is not adjusted in S73, the discharge tray 56 is adjusted (S7).
4) While returning to S46, if the discharge tray 56 has been adjusted, the process proceeds to S75, where it is determined whether or not the device 40 has received the operation end from the machine body 1. When the operation end is not received in S75, the process returns to S46 again, while when the operation end is received, the end process is performed (S7).
6) The staple (multi) mode as described above is ended.

As described above, the sheet post-processing device 40
In the case of binding a plurality of copies, as shown in FIG. 12A, the sheets S of the first copy are conveyed from the machine body 1 side while being subjected to a predetermined bookbinding process on the staple plate 46. Next pass the _first sheet S ₁ to the main pass 41
The sheet S ₁ is conveyed by c, and then the rotation of the conveying roller 43 is stopped, so that the conveyance of the sheet S ₁ is once stopped. Next, FIG.
As shown in 2 (b), the deflector 44 is switched to convey the _second sheet S ₂ by the bypass 41b,
After earning the time loss of the binding time of the first sheet S,
By restarting the rotation of the transport roller 43, the transport of the _first sheet S ₁ is restarted, and as shown in FIG.
The first sheet S ₁ and the second sheet S are placed on the staple plate 46 on which the discharge of the first sheet S is completed.
₂ and paper are ejected in sync.

By the way, the sheets S ₁ and S ₂ discharged on the stapling plate 46 in synchronization with each other as described above.
Is sandwiched between the rollers 53 and 54 as the arm member 55 rotates in the F ₂ direction.
Is rotated in the G ₂ direction to align the _first sheet S ₁ in the transport direction, and the paddler 48 is rotated in the C direction to rotate the second sheet S ₂ in the transport direction. To be aligned. Therefore, each of the sheets S ₁ · S stacked on the staple plate 46 in the upper and lower two layers.
_In No. ₂ , the alignment is ensured by the individual alignment in the transport direction, and the bookbinding quality of the sheets S is surely maintained.

[0050]

As described above, in the sheet post-processing apparatus according to the first aspect of the present invention, the first and second sheets carried in from the image forming apparatus are synchronously stacked on the post-processing plate. In addition, a sheet post-processing apparatus for performing a predetermined post-processing on the sheet on the post-processing plate and discharging the sheet to a discharge tray,
The post-processing plate is provided with first aligning means for aligning the first sheet in the transport direction and second aligning means for aligning the second sheet in the transport direction. ..

As a result, in the sheet post-processing apparatus for synchronously ejecting the first sheet and the second sheet onto the post-processing plate in order to speed up the bookbinding process, the above-mentioned sheets are also processed. At the same time, there is an effect that the sheet can be surely aligned in the conveying direction, and the post-processing quality of the sheet can be surely maintained.

The sheet post-processing apparatus according to claim 2 is the sheet post-processing apparatus according to claim 1, wherein the first aligning means ejects the sheets stacked on the post-processing plate. And the second aligning means is configured to drive the paddler whose blades are in contact with the post-treatment plate.

As a result, the discharging roller for discharging the sheet from the post-processing plate can be used as the first aligning means, and the number of parts and the cost can be reduced.

The sheet post-processing apparatus according to a third aspect is the sheet post-processing apparatus according to the second aspect, in which a sheet is sandwiched between the discharge roller and the discharge roller above the discharge roller. This is a configuration in which a possible driven roller is provided.

Thus, when the sheets are aligned by the first and second aligning means, by sandwiching the sheets between the discharge roller and the driven roller, the sheet alignment can be further improved. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a copying machine according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a sheet post-processing apparatus that constitutes the above copying machine.

FIG. 3 is an explanatory diagram showing each sheet detection switch provided in a post-processing conveyance path that constitutes the above-mentioned sheet post-processing device.

FIG. 4 is an explanatory diagram showing a sheet detection switch including a discharge roller and a driven roller that form the sheet post-processing device.

FIG. 5 is a flowchart showing an operation process in the offset mode of the sheet post-processing apparatus.

FIG. 6 is a flowchart showing an operation process in the staple (single) mode of the sheet post-processing apparatus.

FIG. 7: Staples (multi) of the sheet post-processing device
It is a flowchart which shows a part of operation process in mode.

FIG. 8 is a staple (multi) of the sheet post-processing device.
It is a flowchart which shows a part of operation process in mode.

FIG. 9: Staples (multi) of the sheet post-processing device
It is a flowchart which shows a part of operation process in mode.

FIG. 10 is a flowchart showing a part of an operation process in the staple (multi) mode of the sheet post-processing apparatus.

FIG. 11 is a flowchart showing a part of an operation process of the sheet post-processing apparatus in a staple (multi) mode.

FIGS. 12A, 12B, and 12C are explanatory views showing the sheet conveying operation in the post-processing conveying path in the staple (multi) mode.

FIGS. 13A and 13B are explanatory views showing a sheet conveying operation by a conventional sheet post-processing apparatus, respectively.

[Explanation of symbols]

 1 Body Main Unit (Image Forming Device) 40 Sheet Post-Processing Device 46 Staple Plate (Post-Processing Plate) 48 Padler (Second Alignment Means) 53 Ejection Roller (First Alignment Means) 54 Driven Roller 56 Ejection Tray S Sheet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naka Hiroshi 22-22 Nagaike-cho, Abeno-ku, Osaka City, Osaka Prefecture

Claims (3)

[Claims] 1. A first and a second sheet carried in from an image forming apparatus are synchronously stacked on a post-processing plate, and the sheet on the post-processing plate is subjected to a predetermined post-processing and discharged. A sheet post-processing device for ejecting onto a tray, wherein the post-processing plate has a first aligning means for aligning a first sheet in a transport direction and a second aligning means for aligning a second sheet in a transport direction. A sheet post-processing apparatus, characterized in that the means and the means are individually provided. 2. The first aligning means comprises reverse driving of a discharge roller for discharging sheets stacked on the post-processing plate, and the second aligning means has a blade portion on the post-processing plate. The sheet post-processing apparatus according to claim 1, wherein the sheet post-processing apparatus comprises driving of a paddler which is in contact with the sheet. 3. A rear sheet according to claim 2, wherein a driven roller is provided above the discharge roller so as to sandwich the sheet with the discharge roller and release the sheet. Processing equipment.