JPH089451B2 - Sheet post-processing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet post-processing apparatus that performs a binding operation on sheets on which images are formed by an image forming apparatus.

[Conventional technology]

Conventionally, a sheet post-processing device of this type has been disclosed in JP-A-59-78069.
As described in Japanese Patent Publication No. 1989-331, a processing unit for aligning and binding sheets and a storage tray for storing a processed sheet bundle are completely separated into a unit configuration.

Further, Japanese Patent Application Laid-Open No. 58-47760 discloses a sheet post-processing apparatus having a structure in which a copy sheet is transferred to a binding section by a vacuum conveyance and the bound copy sheet is pushed out to an adjacent storage section.

[Problems that the invention is trying to solve]

However, in the above-mentioned post-processing apparatus, the sheet conveyance section of the sheet is arranged substantially above the sheet storage section, and the sheet conveyance path up to the binding position and the path for sending out the sheet bundle after binding intersect in the bag conveyance, The sheet storage unit is completely covered by the transport path, and it is impossible to check the copy sheet image and the binding state during the processing. The operator can check the copy density defect, the sheet alignment, and the binding state. After all the copying process of the series is finished,
At that time, you may not be able to notice a defect until that time.

Furthermore, in order to be able to process full-size paper A3 (LGL) and the like, the storage section must be expanded accordingly, and the transport section must be expanded accordingly. There is a drawback that the device becomes large in size and costly.

[Means and Actions for Solving Problems]

According to the present invention, the discharging means for discharging the sheet, the first tray supporting the upstream side portion of the sheet discharged from the discharging means in the discharging direction, and the upstream side portion are supported by the first tray. A vertically movable second tray that supports the downstream portion of the sheet, binding means that binds the sheet whose upstream portion is supported by the first tray, and the bound sheet that is the second tray. Moving means for moving to the tray, the first and second trays are inclined so that an upstream side portion thereof becomes lower, and the sheets discharged by the discharging means are bound along the inclination. Since the sheets are moved and aligned in the direction of the means, the sheets stored in the second tray can be easily observed by the operator, and can be immediately found even if a miscopy or a binding failure occurs.

Further, since the first tray on which the sheets to be bound are stacked can be downsized, it is not necessary to upsize the device even if the sheet having a large size can be processed.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing the internal configuration of an embodiment of a copying apparatus to which the present invention can be applied. In the figure, 1 is a sheet post-processing apparatus according to the present invention, 100 is a copying apparatus main body, 200 is a double-sided processing function of turning over a recording medium (paper) in double-sided recording, and recording is performed a plurality of times on the same recording medium. A pedestal having a multi-recording function for performing the above, 300 is a circulation type document feeding device (hereinafter, referred to as RDF) for automatically feeding the document.

A. Main unit (100) In the main unit 100, 101 is a platen glass on which an original is placed, 103 is an illumination lamp (exposure lamp) for illuminating the original, 1
Reference numerals 05, 107, and 109 denote scanning reflection mirrors (scanning mirrors) that change the optical path of the reflected light of the document, 111 denotes a lens having focusing and zooming functions, and 113 denotes a fourth reflection mirror (scanning mirror) that changes the optical path. . 115 is an optical system motor for driving the optical system, and 117 and 121 are sensors, respectively.

131 is a photosensitive drum, 133 is a main motor for driving the photosensitive drum 131, 135 is a high-voltage unit, 137 is a blank exposure unit 139 is a developing device, 140 is a developing roller, 141 is a transfer charger, 143 is a separation charger, and 145 Is a cleaning device.

Reference numeral 151 is an upper cassette, 153 is a lower cassette, 171 is a manual paper feed port, 155 and 157 are paper feed rollers, and 159 is a registration roller. Further, 161 is a conveyor belt that conveys the recording paper on which an image is recorded to the fixing side, 163 is a fixing device that fixes the conveyed recording paper by thermocompression bonding, and 167 is a sensor used in double-sided recording.

The surface of the above-mentioned photosensitive drum 131 is composed of a photoconductor and a seamless photosensitive member using a conductor, and the drum 131 is rotatably supported by a shaft and operates in response to the pressing of a copy start key described later. The motor 133 starts rotation in the direction of the arrow in this figure. Next, when the predetermined rotation control of the drum 131 and the potential control processing (preprocessing) are completed, the original placed on the original table glass 101 is illuminated by the illumination lamp 103 integrated with the first scanning mirror 105, The reflected light of the document is the first scanning mirror 105, the second scanning mirror 107, the third scanning mirror 109, the lens 111, and the fourth scanning mirror 11.
An image is formed on the drum 131 via 3.

The drum 131 is corona charged by the high voltage unit 135. After that, the image (original image) illuminated by the illumination lamp 103 is slit-exposed, and an electrostatic latent image is formed on the drum 131 by the known Carlson method.

Next, the electrostatic latent image on the photosensitive drum 131 is developed by the developing roller 140 of the developing device 139 and visualized as a toner image, and the toner image is transferred onto the transfer paper by the transfer charger 141 as described later. .

That is, the upper cassette 151 or the lower cassette 153
The transfer paper inside or the transfer paper set in the manual paper feed port 171 is sent to the inside of the main body apparatus by the paper feed roller 155 or 157, and is sent to the photosensitive drum 131 at a correct timing by the registration roller 159, and the latent image is transferred. The leading edge of the image is aligned with the leading edge of the transfer paper. After that, the transfer paper passes between the transfer charger 141 and the drum 131, so that the drum 131
The upper toner image is transferred onto the transfer paper. After this transfer is completed, the transfer paper is separated from the drum 131 by the separation charger 143, guided to the fixing device 163 by the conveyor belt 161, fixed by pressure and heating, and then discharged to the outside of the main body 100 by the discharge roller 165. To be done.

After the transfer, the drum 131 continues to rotate and the surface thereof is cleaned by the cleaning device 145 including a cleaning roller and an elastic blade.

B. Pedalstal (200) The pedestal 200 has a deck 201 that can be separated from the main body 100 and can store 2,000 sheets of transfer paper, and a double-sided copying intermediate tray 203. Also, that 2,0
The lifter 205 of the deck 201 that can store 00 sheets is the paper feed roller 20.
As the transfer paper always contacts 7, it rises according to the amount of the transfer paper.

Further, 211 is a paper ejection flapper that switches between the double-sided recording side or multi-recording side path and the ejection side path, 213 and 215 are conveyance belt conveyance paths, and 217 is an intermediate tray weight for pressing the transfer paper. 211, and the transport path 213,215
The transfer paper that passed through is turned over and the intermediate tray for double-sided copying
It is stored in 203. Reference numeral 219 denotes a multiple flapper for switching between double-sided recording and multiple recording paths, which is arranged between the transport paths 213 and 215 and is rotated upward to guide the transfer paper to the multiple recording transport path 221. Reference numeral 223 denotes a multiple paper discharge sensor that detects the end of the transfer paper that passes through the multiple flapper 219. Reference numeral 225 is a paper feed roller that feeds the transfer paper to the drum 131 side through the path 227. Reference numeral 229 is a discharge roller for discharging the transfer paper to the outside of the machine.

During double-sided recording (double-sided copying) or multiplex recording (multiplex copying), first, the discharge flapper 211 of the main body 100 is raised to store the copied transfer sheet in the intermediate tray 203 via the conveyance paths 213 and 215 of the pedestal 200. To do. At this time, the multiple flapper 219 is lowered during double-sided recording, and the multiple flapper 219 is raised during multiplex recording. The intermediate tray 203 can store, for example, up to 99 copy sheets. The transfer paper stored in the intermediate tray 203 is pressed by the intermediate tray weight 217.

At the time of the next-side recording or the multiplex recording to be performed next, the transfer sheets stored in the intermediate tray 203 are registered one by one by the action of the sheet feeding roller 225 and the weight 217 from the bottom to the registration of the main body 100 via the path 227. It is guided to the roller 159.

C. RDF (Circulating Document Feeder) (300) In RDF300, 301 is a stacking tray for setting a document stack 302. First, for a single-sided document, a half-moon roller 304 and a separation roller 303 are used to remove the document stack from the bottom. The sheets are separated one by one, and are conveyed to the exposure position of the platen glass 101 via the paths I to II by the conveying roller 305 and the entire surface belt 306, and then stopped, and the copying operation starts. After the copying is completed, it is sent to the path VI by the large conveyance roller 307 via the path IV, and is further returned to the upper surface of the original bundle 302 by the paper discharge roller 308. Reference numeral 309 denotes a recycle lever that detects one circulation of a document. When the document is fed, the recycle lever is placed on the top of the document stack and the documents are sequentially fed. When the trailing edge of the final document leaves the recycle lever 309, it falls by its own weight. Therefore, one circulation of the original is detected.

Next, in the case of a two-sided original, the original is once guided to the paths I, II to III as described above, and the rotatable switching flapper 310 is switched there to guide the leading edge of the original to the path IV, and the conveying roller 305 makes the path II. Platen glass 101 through the full belt 306 through
Stop after transporting to. That is, the document is inverted by the large conveyance roller 307 along the route of paths III to IV to II.

Further, the number of originals can be counted by transporting the original bundle 302 one by one through the paths I to II to III to IV to VI until one cycle is detected by the recycle lever 309.

D. Sheet Post-Processing Device 1 indicates a sheet post-processing device. To connect the device itself to the image forming apparatus, first, a holding unit 6 in the image forming apparatus is formed by a lock arm 5 formed on the upper portion of the sheet post-processing device 1. It is positioned and attached to. Further, a link unit that supports the main body 1 by the lower link 7 and the upper link 8 is formed in the lower part of 1, and a torsion bar is provided at a fulcrum portion 9 of the lower link 7, and the lower link 7 is rotated clockwise around the fulcrum portion 9. It is biased in the direction of rotation. When a sheet conveyance failure (jam) occurs in the image forming apparatus or the sheet post-processing apparatus, when the sheet member staying in the main body is taken out, the apparatus itself is rotated by rotating the lock arm 5 in the x direction. Separated in the y direction, the weight of the entire apparatus is mitigated by the 9-torsion bar, which facilitates attachment / detachment to / from the image forming apparatus.

The copy sheet discharged from the image forming apparatus discharge section is further sent to the downstream side by the paper pulse 12 formed by the upper guide 10 and the lower guide 11 in the sheet processing apparatus. A sheet detection sensor 13 detects a passing sheet and a staying sheet. 14 is a tray discharge lower roller, and 15 is a pressing roller. Reference numeral 16 'is a discharge alignment belt, which is not shown in the figure and is rotated by being clamped between the tray discharge lower roller 14 and the pressing roller 15, but as a belt disengagement prevention measure, an endless rib is provided near the center of the belt. It is configured to rotate by engaging with the tray discharge lower roller. Reference numeral 17 is a backing plate, which serves as a reference surface when aligning copy sheets, and the staple position is also substantially determined by the position of the backing plate 17. The home position is provided with a positioning micro switch 18 so that the backing plate can be stopped at one position. Also, the lower part of the touching plate 17 has a rack, and the first roller 19, the pinion 20, and the second roller 21 arranged in three places make the first roller
The sheet can be moved in the conveyance direction in parallel with the fixed placement portion 22 as the tray. The drive source is a pinion 20, and a first roller 19 that obtains a driving force by a motor (not shown),
The second roller 21 serves as a regulating member for keeping the parallel movement of the contact plate 17. If the touching plate 17 can be positioned at an arbitrary position (for example, driving is transmitted by a stepping motor or the like to control the stop position by the number of pulses from the home position), the stapling position for the copy sheet can be determined. It is possible to change. Reference numeral 23 is a positioning plate that serves as a reference for applying the copy sheet in the direction perpendicular to the paper conveyance direction (width direction).

In this embodiment, the alignment of the sheet in the width direction is shown in FIG.
This is achieved by the Alignment Belt (described below). A staple unit is arranged in a region 24 shown by a chain line in FIG. Although the description of this staple unit is omitted in the description of the present embodiment, the configuration is almost the same as that of an electric (solenoid) or motor-driven automatic stapler device that is generally commercially available, and a staple needle is driven into the sheet to make the sheet. Bind. Reference numeral 25 is a storage tray as a second tray, which also functions as a possible mounting member which is an embodiment of the present invention. The storage tray 25 can be moved in the gravity direction (z direction in the drawing) and in the width direction by a driving force from a drive source (described later) built in the lower portion 25a. Further, the regulation plate 26 plays a role of a stopper that contacts and positions the rear end of the storage sheet when the storage tray 25 descends, but the guide rollers 27a, 27 attached to the stay 27 of the sheet post-processing device.
It is supported by b and enables the sludge to move in the width direction integrally with the storage tray. As a result, the copy sheet stack stacked on the storage tray is configured to be movable relative to the fixed mounting portion (or the paper discharge position) without shifting with respect to the movement of the tray in the width direction. The description of the constituent elements that could not be included in the cross-sectional view (FIG. 1) is added to FIG.

FIG. 2 is a plan view of the sheet post-processing apparatus 1 of this embodiment, which is vertically divided at the paper path 12 portion, and 101 is a storage tray level detecting arm, which indicates the height of the processed copy sheet group. It serves as a control means for detecting and detecting the height of the fixed tray 22 in the state where the storage tray 25 stores the sheet group.
101 is a level detecting arm, and 501 in FIG. 6 is a micro switch. Reference numeral 102 denotes a second aligning belt, which together with the discharge aligning belt 16 forcibly conveys the copy sheet to the alignment reference (width direction). Specifically, the end of the copy sheet is attached to the positioning plate 23. In addition, the second alignment belt 102
Is driven by a motor (not shown), the copy sheet jumps over the width-adjusting portion, falls, and is drawn in from the end portion of the sheet by the discharge alignment belt 16. Also, 10
The width-adjusting belt 2 is supported by the rotary drive shaft 103, is in contact with the belt and the sole surface (the lower part of the positioning plate 23) during the discharge of the copy sheet, and when the copy sheet group is pushed out, it is attracted by a solenoid or the like. With a link not shown,
The belt 102 is separated from the tray surface by the width. FIG. 3 is a front view of the tray discharge part, which is indicated by a chain line.
201 is a reference position of the end of the ejected copy sheet, and the staple unit 24 is normally located outside the end of the ejected sheet.
Further, since the discharged sheet is applied to the positioning plate 23 by the width aligning belt 102, the discharged sheet falls on the tray surface and is drawn to the 202 (two-dot chain line) stapler operating port 24a. 202 is the alignment reference position in the width direction and the staple reference position. Stapler 24 is upper unit 24b
Is in the direction of arrow a with the shaft 24d as the center, and the lower unit 24c is the shaft 24d.
The needle is driven by moving in the direction b around the center. Further, the driving motor of the contacting member 17 is 203, and the gears 204, 205
Drive is transmitted to the pinion 20 by.

FIG. 4 shows a drive unit built in the tray lower portion 25a. 301 is a vertical movement motor, the driving force of which is a gear 302
To the pinion 303, and the pinion 303 engages with the rack 304 fixed to the side plate of the main body to enable the storage tray 25 to move up and down. Further, the guide rollers 305 and 305 'are mounted on the unit of the lower portion 25' of the storage tray to enable smooth movement along the guide rail 306 fixed to the side plate of the main body. The guide rail 306 also receives the weight of the storage tray and the weight of the stored copy sheets.

FIG. 5 is a diagram showing the movement of the positioning plate 23. The positioning plate 23 is fixed because it serves as a reference surface in the width direction when the copy sheet is ejected. However, when the copy sheet group after one cycle of copying is sent to the storage tray by the contact member 17, the positioning plate 23 is used. The rear end of the sheet on the lower support plate 23a of the storage tray 25 is moved by moving the positioning plate 23.
It is designed to be dropped on top. In this embodiment, it is possible to store a vertically long size full-size paper (A3, B4, etc.), and the contact surface of the positioning plate 23 is extended to the upper part of the storage tray 25. However, the positioning plate 23 may be short if it is a device of only a half size such as A4 size, and it can be arranged in the fixed mounting portion 22, so that a rotating mechanism is not necessary. In this configuration, the arm 401 is arranged from the rotation fulcrum 23 ′ of the positioning plate 23, and the suction force of the solenoid 403 causes the rotation of the 23 (2
(Indicated by the dotted chain line).

FIG. 6 is a schematic view of the end portion of the storage tray and the level detection portion. FIG. 6 (a) shows a state in which the tray is descending, and when the state is as shown in FIG. 6 (a), the micro switch 501 is OFF.
Then, the storage tray 25 rises in an attempt to return to the state of FIG. 6 (b) where the micro switch is ON. Further, the level detecting arm 101 is constantly given a turning force in a counterclockwise direction (direction P in FIG. 6) by a spring means (not shown).

The fixed placing portion 22 and the storage tray 25 are inclined upward in the sheet discharge direction. Also, the tray discharge lower roller 14
The aligning belt 16 rotating together with the fixing belt 22 is in contact with the fixed placement portion 22, and when a sheet is placed on the fixed placement portion 22, it comes into contact with the fixed placement portion 22 and gives a conveying force in the direction of the contact plate 27. Similarly, the second aligning belt 102 also rotates while contacting the sheet on the fixed mounting portion 22, and gives the sheet a conveying force toward the positioning plate 23.

Fixed loading section until the tray storage timer expires
The sheet dropped on the sheet 22 has its rear end and side edge in the sheet discharge direction attached to the contact plate 27 and the positioning by the inclination of the fixed mounting portion 22 and the storage tray 25 and the conveyance force of the alignment belt 16 and the second alignment belt 102, respectively. It abuts the plate 23 and is aligned (FIG. 8).

E. Controller (800) FIG. 7 shows a circuit configuration example of the controller 800 of the embodiment shown in FIG. In FIG. 7, reference numeral 801 is a central processing unit (CPU) that performs arithmetic control for executing the present invention. Reference numeral 803 denotes a read-only memory (ROM) in which a control procedure (control program) as shown in FIGS. 13 and 14 according to the present invention is stored in advance, and the CPU 801 is via a bus according to the control procedure stored in the ROM. Control each connected component device. A random access memory (RAM) 805 is a seed storage device used as a storage area for input data, a storage area for work, and the like.

807 is an interface (I / O) that outputs a CPU 801 control signal to the load of the tray up / down motor 301 and the like, and 809 is an interface that inputs an input signal of the sheet detection sensor 13 and sends it to the CPU 801.

Next, an operation example of this embodiment will be described with reference to the flow charts of FIGS. 8 to 12, 13 and 14.

FIG. 13 is a flow chart for explaining the initial operation of the post-processing apparatus executed when the power is turned on or when copying is started. In S1, the solenoid 403 for retracting the positioning plate 23 is used.
Is turned off to set it to the staple position (solid line in FIG. 5), the storage number counter described later is cleared to 0 in S2, and in S3 to S5, stepping is performed until the touching plate 17 comes to the home position. The motor 203 is reversely turned on and stopped.

Next, in S6 to S8, the height of the tray is checked, and the tray vertical motor is turned on and stopped until the sheet level sensor (micro switch 501) is turned on. This S1
By the processing of ~ S8, the sheet is ready to be discharged from the copying machine.

Next, FIG. 14 is a flow chart for explaining the sheet post-processing operation after the start of copying. First, in S10, the transport mora 810 (FIG. 7) that drives the tray discharge lower roller 14 is turned on, and in S11, the sheet detection sensor is activated. After 13 detects the leading edge of the sheet, waits until the trailing edge of the sheet is detected in S12, and then the tray storage timer is started in S13. The sheet sandwiched and conveyed by the tray discharge lower roller 14 and the pressing roller 15 falls on the fixed placing portion 22 and the storage tray 25. Waiting for the tray storage timer to end in S14, one sheet is stored in the tray at this point, and in S15, the (stored number counter) is incremented by one. Then, at this point, it is checked in S16 whether the copy process has completed one cycle. This is for example described above
The signal for detecting the circulation of the original document by the RDF recycling lever 309 may be checked. If one cycle is not completed, the tray height is checked by the level detection sensor 501 in S17, and if the operator pulls out the bundle of sheets stacked on the tray, the tray is raised so that the height of the paper is always constant. Have control over.

Next, when it is detected in S16 that one cycle of copying is completed, the stapler motor 811 is operated in S18, and the staple unit 24 performs the stapling process. If the copy of one cycle is not completed, the process returns to S11, and the sheets to be discharged next are stacked and aligned (9th
Figure).

The staple process is performed in S18, and the completion of the staple process is waited in S19. When finished, the tray motor 301 is lowered and turned on in S20, the timer for the lowered amount according to the (number of stored sheets counter) is started in S21, the end is waited in S22, and the tray motor 301 is turned off in S23. This state is shown in FIG. This timer value is, for example, assuming that one sheet has a thickness of 0.1 mm, it is a value that decreases by 2 mm when counter = 10 and 3 mm when counter = 20.
The value is set to be slightly higher than the number of sheets, such as a falling value. Then, in S24, the positioning plate retraction solenoid 403 is turned on, in S25 the contact plate stepping motor 203 is turned on in the forward direction, in S26 the push-out amount counter is started, in S27 the motor is turned off after waiting for the end. 1st in this S25-S28
From the state shown in FIG. 0, the contact plate 17 is moved in the direction of the storage tray by the pinion 20, and the stapled sheet bundle is pushed out onto the storage tray 25 as shown in FIG. At this time, the contacting side plate end portion of the sheet bundle is the lower support plate 23a of the positioning plate 23.
The positioning plate is retracted by the solenoid 403 to the position indicated by the two-dot chain line in FIG. After pushing out the stapled sheet bundle, press S2
Perform the above-mentioned initial processing in accordance with the flow chart of Fig. 13 in 9 and return the positioning plate and the touching plate to the initial position, and in S20 to S23 described above, set the level sensor 501 to the tray slightly lower than the number of sheets. It is raised until it is turned on (S8), and is returned to a position where a continuous flat surface is formed between the fixed placement section 22 and the top of the newly stacked copy sheets. Then, the process returns to S11 and waits for the next sheet discharge.

According to this configuration, the capacity of the continuously processable copy sheet bundle is increased by increasing the descending amount of the storage tray unit.

Also, even if the stack of copy sheets already stored in the tray is pulled out during the copying operation, the level detection arm raises the storage tray by the amount of the thickness pulled out, and the uppermost position of the storage sheet and the fixed placement part are newly connected. The target plane is formed.

The fixed stacking unit 22 for the sheet bundle bound in the above embodiment
The contact plate 17 was moved in order to move it to the storage tray 25 side. However, other moving means may be provided. For example, a member that engages with the rear end of the sheet and pushes it out may be separately provided. Further, known sheet conveying means such as a conveyor belt and a conveying roller may be used.

[Other Examples]

In the above embodiment, the vertical movement of the storage tray 25 was achieved by driving with a motor. However, as shown in FIG. 15, an elastic member 801 such as a spring is arranged at the bottom of the storage tray to balance the spring constant with the load of the sheet. And set
The storage tray can be moved downward depending on the weight of the copy sheet.

In the above-mentioned embodiment, the bundle of copy sheets after alignment and binding is pushed out and stored in the paper conveying direction.For example, as shown in FIG. 16, there is the stapler 24 on the front side in the direction perpendicular to the paper conveying direction. Therefore, it is limited to the back side, but in the case of a device in which the stapler is arranged on the rear side, it is pushed out to the front side, and the processed sheet is moved to a position removed from the staple opening 24a and moved and stacked. The same function can be obtained as the storage tray 25 that can be moved up and down. At this time, as a member for pushing out the stapled sheet bundle from the fixed placement portion 22 to the storage tray 25, the widthwise alignment plate 23 can be used.

In this embodiment, if the position of the discharge alignment belt 16 is set to the storage tray 25 side (FIGS. 17 and 18), as shown in FIG. By moving 17 to the storage tray 22 side and positioning it, the sheets can be directly aligned and accumulated on the storage tray 22 without performing the pushing operation. When stapling, the contact plate 17 is
It is positioned at the stapling position shown in the figure, and after the stapling, the pushing operation is performed.

Further, in this case, the widthwise alignment of the copy sheets can also be performed by the movable width baffle plates 901 and 902 (FIG. 13).

As in the above embodiment, the tray for alignment and binding is divided into the fixed placing portion and the movable placing portion, and the movable placing portion also serves as the storage tray, so that the entire device (internal configuration: side plate, stay, It is possible to reduce the size and weight of the bottom plate and the external structure: the cover ring.

With a simple structure, a large volume of copy sheet groups can be stored continuously.

When used as a system machine because the moving distance between the processing unit (alignment and binding) and the storage unit is small, the copying interval for each cycle does not have to be opened for this device (the waiting time for binding and extrusion is short. ) Improving system throughput.

Since the group of sheets is shifted in the aligned state, the bundles of bound sheet groups are hardly disturbed even when the bundles of unbound sheets are conveyed. Further, since the storage tray can be swung to the left and right in the width direction, it is possible to sort the unbound sheets by cycle.

〔The invention's effect〕

As described above, in the present invention, the second device outside the device is used.
The sheets stored in the tray are easily observable,
Even if a miscopy or a binding error occurs, it can be found immediately.

Further, since the first tray for stacking the sheets to be bound may be smaller than the sheets to be bound and can be downsized, it is not necessary to enlarge the placement even if the sheet having a large size can be processed. In addition, the first and second trays are inclined so that the sheets can be moved, and the sheet alignment is good.

[Brief description of drawings]

FIG. 1 is a sectional view of a sheet post-processing apparatus embodying the present invention,
FIG. 2 is a plan view, FIGS. 3 to 6 are principal part explanatory diagrams, FIG. 7 is a block diagram showing a circuit configuration, and FIGS. 8 to 12 are operational explanatory diagrams, FIG. 13 and FIG. Float, Figures 15-19
The figure shows another embodiment. 1 …… Sheet post-processing device 14 …… Tray discharging lower roller 15 …… Pressing roller 17 …… Attached plate 22 …… Fixed loading part 24 …… Stapling unit 25 …… Storage tray

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Sato 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Takeshi Honjo 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Incorporated (56) References JP-A-58-47760 (JP, A)

Claims (6)

[Claims] 1. A discharging unit configured to discharge a sheet, a first tray supporting an upstream side portion of the sheet discharged from the discharging unit in a discharging direction, and a sheet having an upstream side portion supported by the first tray. A vertically movable second tray that supports the downstream side portion of the sheet, binding means that binds the sheet whose upstream side portion is supported by the first tray, and the bound sheet to the second tray. The first and second trays are inclined so that the upstream side portion thereof becomes lower, and the sheets discharged by the discharging means are bound along the inclination. A sheet post-processing apparatus characterized by moving and aligning in the direction of the sheet. 2. The sheet post-processing apparatus according to claim 1, wherein the discharging means discharges the sheet so as to straddle the first tray and the second tray in both the binding mode and the non-binding mode. . 3. The sheet post-processing apparatus according to claim 1, wherein the discharging unit discharges the sheet to the second tray. 4. The sheet according to claim 3, further comprising means for holding the ejected sheet on the second tray in the non-binding mode, and for releasing the retention of the ejected sheet in the binding mode. Aftertreatment device. 5. The sheet post-processing apparatus according to claim 4, wherein the holding releasing means also serves as the moving means. 6. A discharging means for discharging a sheet, a first tray for supporting one end portion in a direction intersecting a discharging direction of the sheet discharged by the discharging means, and one end portion supported by the first tray. A vertically movable second tray that supports the other portion of the sheet, a binding unit that binds the sheet whose one end portion is supported by the first tray, and the bound sheet that is the second tray. The first and second trays are inclined so that the upstream side portion thereof becomes lower, and the sheets discharged by the discharging means are bound along the inclination. A sheet post-processing apparatus characterized by moving and aligning in the direction of the sheet.