JPH06234441A - Registration device - Google Patents

Abstract

PURPOSE:To convey a sheet in a proper condition by correcting a tilt and lateral displacement of the sheet. CONSTITUTION:When a sheet is detected for its tilt by detecting means 1003, 1004, a paired conveying rollers 1002 turn a nip part between itself and a position in parallel to a sheet point end part to hold the transcription sheet, thereafter turn the nip part to a direction at a right angle to a sheet conveying direction. In the case of providing lateral displacement in the sheet, the paired conveying rollers 1002 are moved in a thrust direction to correct lateral displacement of the sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a registration device for correcting an inclination of a sheet, a position in the conveying direction and a position in a direction perpendicular to the sheet in an image forming apparatus such as a copying machine.

[0002]

2. Description of the Related Art In a conventional registration device, the leading end of a sheet is brought into contact with a nip portion to correct skew of the sheet, and a pair of registration rollers is rotated at the timing of forming an image on the sheet. .

[0003]

The above-mentioned registration roller pair is not provided with means for correcting the lateral deviation of the sandwiched sheet, automatically correcting the inclination of the registration roller pair itself, and the like.

An object of the present invention is to provide a registration device capable of correcting the lateral deviation of the sheet and the inclination of the roller pair itself.

[0005]

SUMMARY OF THE INVENTION The present invention is a registration device for sending a transfer material to an image forming section at a timing, the transfer roller pair for transferring the transfer material, and the upstream side of the transfer roller pair. And a means for inclining the conveyance roller pair from a direction perpendicular to the transfer material conveyance direction, a detection unit for detecting the inclination of the tip of the transfer material in a direction perpendicular to the transfer material conveyance direction, Means for varying the rotation speed of the roller pair.

[0006]

When the inclination of the conveyed sheet is detected by the detecting means, the conveying roller pair as the registration roller pair rotates about one end to make the nip portion parallel to the leading end of the sheet. To do so. The pair of transport rollers after the front end of the sheet is nipped is rotated in a direction perpendicular to the sheet transport direction, and the inclination of the sheet is corrected to an appropriate state. Further, if the sheet is laterally displaced, the pair of conveying rollers is moved in the thrust direction to correct the lateral position.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an overall view of an image forming apparatus according to the present invention and an output paper processing apparatus connected thereto.

In FIG. 1, a paper feed unit and a reader unit above the paper feed unit are provided on the left side of the drawing. Paper feed unit frame 1
102 is configured independently of the main body frame 1101. Reference numerals 1103 and 1104 denote paper feed trays containing a large number of sheets as transfer sheets, 1107 denotes a sheet conveyance path, and 14
Is a sheet feeding roller for feeding the sheet, and 15 is a conveying roller. Reference numeral 11 denotes a pressure plate that presses the document against the platen glass, and 12 denotes an optical system as a reader that optically reads the document.

A photosensitive drum 21 as an image forming unit is arranged on the downstream side of the paper feeding unit. Reference numeral 35 denotes an optical image based on image information from the optical system 12 and the photosensitive drum 21.
A laser scanner 23 for irradiating the toner, 23 a pre-charger, 24 a developing device for forming a toner image, 26 and 27 registration rollers, 25 a transfer roller for transferring the toner image to a sheet to be fed, 22 a cleaner, 29 Is a conveyance belt, and 30 is a fixing roller for fixing the transferred toner image.

The stacker 73 represents a device for storing output paper.

<Description of Sheet Conveying Device (Sorter)> Twin carriage bundle conveying device, which is larger than the size of the paper stored in the bin.

When the sheets are conveyed in a bundle, if the carriages 76 and 77 (FIG. 2) move independently, they will "pass through".
I can't. Therefore, it is necessary to move simultaneously when a bundle is conveyed, and when the sheets are a bundle, there is a space between the sheets, so that the productivity of the apparatus does not decrease. For small paper thickness, conventional "slip through" ensures productivity.

<Description of Output Paper Processing Device> In the output paper processing device of the present invention, (1) a pair of rollers 209 described in the saddle stitcher and (2) 2 described in Z folding will be described.
The pair of rollers 14 and 215 are both longer than the paper width (see FIG.
It has (l _G > l _p ), and has a large pressure contact force.

According to FIG. 1 according to the present invention, the two rollers are also used as the folding roller 58 to save the space.

When the LGL and the LTR are mixed, the LGL is the LTR
Match by folding to size. This is performed using a Z-folding folding roller. In addition, it is performed by using a saddle stitcher folding roller.

These are the stoppers 204,
This is done by adjusting the positions of 213, 216, etc.

Next, the structure of the saddle stitcher will be described.

After passing through the paper guide plate 201, the transfer paper P (FIG. 7) exits the discharge roller 202 and is stacked on the stitcher tray 203. A stapler 206 is prepared in advance at a position of half (= l / 2) of the length l of the transfer paper P regulated by the paper stopper 205 and the paper aligning plate 205 that aligns and stacks the paper by moving in the direction of the arrow 205x. And stapled to the position shown in FIG.

After that, the stitcher tray 203 is indicated by the arrow 2.
It moves in the direction of 03x, and the half position of the transfer paper P (the position where the staple is applied) comes just below the saddle knife 207 (FIG. 9). The saddle knife 207, the folding roller 208, and the folding roller 209 are as shown in FIG. 10. The folding roller 209 is a rubber roller arranged in the shape of a ball, and the saddle knife 207 can be inserted in a place without the rubber. Yes (temporary folding). Further, the folding roller 209 has a rubber portion having a width equal to or larger than the width of the paper, and the pressing force of the folding roller 208
Much larger than this, the transfer paper P
Fold the saddle.

Next, the structure of Z-folding will be described.

The transfer paper P coming in from the arrow 210x in FIG. 11 (the rotation direction of the roller in FIG. 12) is 211, 212.
After passing through the pair of rollers (for the purpose of explanation, it is assumed here that A3 paper is Z-folded onto A4 paper), it is conveyed until it hits a stopper 213. Then on the pass 211
In the space of A3 transfer paper P begins to form a loop (the distance between rollers 211 and 212 and stopper 213 is A3 length l
= Shorter than 420, 214, 215 again
The roller pair is set so that the length of A3 is 3/4).

The transfer paper P has a structure as shown in FIG.
It touches the roller pair 215. Here, the transfer paper P is pulled by the rollers 214 and 215, and when it leaves this roller, A
The 3 transfer paper P'is folded 1/4 of its length.

Further forward, the transfer sheet P'is struck by the stopper 216 and becomes the transfer sheet P "Z-folded by the roller pair of 214 and 215 in the same manner as the above-mentioned movement (FIG. 14).

At this time, the folding rollers 214, 215, 217 have rubber portions of 214 and 215, 214 and 217 which are larger than the paper width, and the pressing force is sufficiently large to fold the transfer paper P with this roller. .

<Description of Transfer Paper Conveying and Processing Device> A plurality of copy paper processing devices (stapler / binder / binder) connected to the main body of the image forming unit such as a copying machine or a printer.
By aligning the heights of the inlet and the outlet of the transfer paper / transfer paper stack of the stacker / sorter / sorter) to the same height, it becomes possible to freely combine the respective devices. In addition, by combining the heights of the discharge ports of the main body of the image forming unit, it becomes possible to combine the main body (including the main body and the stacker, the main body and the sorter, etc.).

Similarly, the transfer paper feeding device can be freely connected by matching the heights of the receiving port and the discharging port, and the same height as the transfer paper receiving port of the image forming apparatus. By doing so, any combination is free.

In the figure, the finisher, the binder, the stacker, and the sorter are copy paper processing devices each having an independent frame, and the heights of the entrances and exits of the devices are the same, so that there is no binder, for example. It is possible to combine a stacker, a stacker, and no sorter. The same applies to the paper feeding device.

<Description of Trimmer of Output Paper Processing Device> Up to now, tab paper as shown in FIG. 15 having tabs in advance has been required to put sorting paper in a copying machine or a printer.

Further, the length of the tab portion is fixed (see FIG. 15).
If there are few sorts, tab paper that is unnecessary is wasted (if there are three sorts, the remaining two are unnecessary). By providing cutters 1 and 2 that can move up and down as shown in FIG. 16 in the output paper processing apparatus, it is possible to make sort papers of various tab lengths, prepare tab papers in advance, or waste tab papers. Never throw away.

Next, a specific example of the trimmer will be described.

Transfer paper P passing through a pair of entrance rollers 401
Is advanced by being restricted by the skew feeding roller 402 to the stopper 403, and is advanced to the retractable stopper 404. The transfer sheet P has replaceable blades 406a on cutter stands 406 and 407 which are movable in the directions of arrows 405x.
And 407a, the transfer paper P becomes a sorting paper having a tab portion. (The cutter table for 406 and 407 is indicated by arrow 410.
It can move in the x direction and press-cuts the transfer paper between it and a pedestal (not shown). ) After cutting, the stopper 404
Is retracted under the paper guide 408, and is again conveyed by the roller 402 and the exit roller 409.

<Explanation of the stapler unit of the output paper processing device> The transfer paper P sent from the arrow 501x in FIG. 20 is stacked on the stack tray 503 by the entrance roller 502. At this time, the skew feed roller 504 regulates the width direction of the paper by an abutting guide (not shown). When a desired number of pages are stacked on the tray, the stopper 505 retreats around 505a as a rotation center, and the stacked paper is sent to the stapler 506 by the roller 504 and stapled.

Even when stapling, if output paper is sent, there is no place to store it, so the tray is
It has more than one step. Further, if arranged as shown in FIG. 21, both of the two trays are connected to the stapler simply by rotating the tray.

At this time, since the tray position on the tray entrance roller side does not change, the output paper can be continuously stored. Also,
With this configuration, even when an abnormality occurs after this stapling (JAM or the like), one of the trays can be used as the escape tray because there are two trays. In other words, by sending accumulated paper etc. to this escape tray,
It is possible to reduce processing points and time during AM processing.

<Description of the gluing device of the output paper processing device> The sheet bundle sent to the gluing device is sent in parallel (FIG. 22). However, it is easy to perform the gluing in the vertical direction, and therefore, the unbound output paper bundle must be changed in the direction of 90 ° (horizontal → vertical). Further, when ejecting from the gluing device, it is better to perform in the direction of FIG. 23 for the adjacent stacker or the like, so it is necessary to rotate again 90 ° (vertical → lateral).

Next, the sizing unit will be described.

The unstitched output sheet bundle P sent from the arrow 702x in FIG. 24 is nipped by the pair of conveyor belts 702 whose spacing can be freely changed, and hits the stopper 703 retractable in the direction of the arrow 703x. 702 stops moving. The belt pair 702 is pressed with an appropriate force in the arrow 702x direction by a pressing mechanism (not shown). Illustration of the belt pair 702 and the like is omitted.

With a link mechanism or a hinge mechanism, FIG.
The output sheet bundle P changes its direction from the horizontal direction to the vertical direction. At this time, the belt pair is further pinched in the direction of 702x ', and at the same time, the stopper 7
03 is retracted and the belt is rotated in the direction of arrow 702y.

Guided by the guide 704, the glue tape 705 (the upper surface is glue and the lower surface is paper) is pushed in the guide direction of 706, and the belt is further rotated to land on the heater of 707. When the tape has melted and the belt pair 702 has been reversed, and the output sheet bundle P has been returned to its original position, the sheet returns to the position shown in FIG. 24, and the output sheet bundle is fed in the direction of the arrow 701.

<Description of Sheet Storage Device (Stacker)> In FIG. 26, FIG. 27 and FIG. 28, when one sheet is used, the sheet is offset by an oblique feed roller or the like, and when there are a plurality of sheets, the discharge roller is moved in the thrust direction. Offset.

If the two are made to be the same, (1) if there is a thickness, offset cannot be performed by the skew feed roller. (2) When the number of sheets is one, if the discharge roller is moved to the thrust, it will not be in time.

Therefore, a means for switching the offset means is necessary.

<Description of Stack Conveying / Single Conveying Path of Stacker> FIGS. 29A and 29B show a single sheet conveying operation, and FIGS. 30A and 30B show a bundle conveying operation. When the bundle is conveyed, the guide and the like move together with the roller. If the roller is a large roller, the original transport path becomes wide, which is an obstacle when transporting one sheet.

<Description of Concatenated Path> FIG.
The connecting path which conveys a sheet to a sheet sorting device is shown. The connecting path has a plurality of transport paths for sorting sheets (transfer paper) into a plurality of bins, and the central transport path has
A straight path 708 is provided. This straight path 708 has a roller pair and a conveyor belt,
Connect to the sort path that has the highest bundle carrying capacity.

<Description of Registration Mechanism> FIGS. 33 to 35 are views relating to registration.

In FIG. 33, the transfer paper 1001 is fed from the direction of the arrow in the figure. The transport roller pair 1002 is
It is supported by the frame 1011 and the supporting plate 1010. The sensor 100 is provided in front of the pair of transport rollers 1002.
3 and 1004 are arranged at right angles to the transfer paper conveyance direction. On the supporting plate 1010, the motor 1006 has a screw 1
It is locked via 006A. A gear 1009 is attached to one end of the pair of conveying rollers 1002 and meshes with the gear of the motor 1007.
It is rotationally driven by 007.

At the other end of the roller 1002, the roller 110
2, the bearing 1012 is attached so that there is almost no play in the thrust direction. The bearing 1012 is connected to the motor 1008 via a screw 1008A. The transfer paper 1 is provided on the downstream side of the roller 1002.
CCD sensor 1 for detecting the sheet at the edge of 001
005 is provided.

The operation of the transfer paper 1001 will be described with reference to FIG. 34. The inclination of the leading end of the transfer paper 1001 is detected by the descriptions 1003 and 1004. In accordance with the tilt calculated by a calculation mechanism (not shown), the motor 1006 rotationally moves around a rotation center (not shown) so that the nip line of the roller pair 1002 is tilted until it is parallel to the leading edge of the transfer sheet. (This operation is naturally performed on the transfer paper 1001.
Is performed before entering the nip line of the roller 1002).

After the transfer paper 1001 enters the roller 1002 in the nip, the motor 1006 is rotationally driven, and the nip line of the roller 1002 is rotated so as to be perpendicular to the transfer paper transport direction. Since the roller 1002 sandwiches the transfer paper, the transfer paper is also perpendicular to the transport direction. Depending on the direction in which the roller is rotated, it is necessary to pull the transfer paper in the transport direction. At that time, the transfer paper may be loosened by slightly lowering the rotation speed of the roller.

When the transfer paper 1001 further advances, the sensor 1005 detects the position of the end portion of the transfer paper 1001.
The sensor 1005 is preferably a CCD or the like. The shift amount of the roller 1002 is calculated by a calculation mechanism (not shown) according to the detected position of the transfer paper, and the motor 100
8 is driven. The screw 1008A rotates by driving the motor 1008, and the bearing 1012 and the roller 100
Move 2 in the thrust direction. As a result, the thrust position of the transfer paper is corrected.

Further, the shift of the transfer paper conveying direction with respect to the image formed by the image forming unit (not shown) is calculated according to the timing at which the front end of the transfer paper crosses the sensor 1005, and the rotation speed of the motor 1007 is adjusted appropriately. The deviation can be corrected by adjusting the amount.

The series of operations can be performed without stopping the rotation of the roller pair 1002. Therefore, it is particularly effective for a machine that has a high-speed transfer paper feed, a machine having a digital optical signal image forming means (laser, LED element array), and a transfer paper feed mechanism with a short interval between transfer papers.

FIG. 35 shows another embodiment, in which a roller pair for correcting the inclination of the transfer sheet and a roller pair for correcting the thrust position downstream of the roller pair are separately formed. By forming in this way, it becomes easy to apply this registration mechanism to a machine that feeds a short transfer paper in the carrying direction at a high speed.

<Description of Image Forming Apparatus> In FIG. 1, the main body frame 1101 and the paper feed unit frame 1102 are independent. The paper feed unit frame 1102 includes transfer paper transport paths 1107 and 1108 together with the paper feed unit.

When a paper jam occurs, the operator
By pulling out the paper feed unit frame integrally from the main body, the transfer paper staying in the paper feed unit is intensively processed.

Further, referring to FIG. 11-2, the sheet feeding unit frame 1
Reference numeral 102 is divided into an upper frame body 1109 and a lower frame body, each of which has a structure that can be pulled out / stored in the paper feed unit frame body.

In each configuration, each paper feed tray 110
The three units 1106 can be independently withdrawn / stored.

<Description of Processing Apparatus in Multiple Steps of Output Paper> FIGS. 36 to 38 show a processing apparatus for processing output paper in a plurality of steps.

FIG. 36 shows a conventional apparatus having a plurality of processes for a sheet image-processed by the image forming apparatus, for example, a plurality of processing mechanisms of a stapler and a saddle stitcher in one processing apparatus. FIG. 37 shows a schematic diagram of FIG. 36. As shown in the figure, the processing device is generally configured such that the saddle stitcher and the stapler have different sheet discharge ports (three including the inserter in the above example).

With the above configuration, when different output paper processing is performed, it is difficult for the user to know where the sheet to be obtained comes from, which is inconvenient.

FIG. 38 is a schematic diagram of an output paper processing apparatus in which the arrangement of a plurality of processing mechanisms is improved. By arranging the Z-folding device, saddle stitcher, stapler, inserter, etc. as shown in FIG. 38, the sheet can be discharged from one outlet, and the sheet can be taken out conveniently.

[0063]

According to the present invention, the nip portion of the conveying roller pair for registration is rotated so as to be parallel to the inclination of the leading end portion of the sheet to be inserted, and the nip portion sheet is conveyed after the sheet is nipped. Since the pair of conveying rollers rotate so as to be perpendicular to the direction, the sheet can be always conveyed without being tilted. Also, if there is a lateral misalignment of the sheet, the pair of transport rollers moves in the thrust direction,
It is possible to correct the lateral displacement of the sheet. This allows
The sheet can always be conveyed in an appropriate state.

[Brief description of drawings]

FIG. 1 is an overall view of an image forming apparatus and an output paper processing apparatus to which the present invention is applied.

FIG. 2 is a side view of the carriage of the sorter (post-processing device) section.

FIG. 3 is a front view of a roller pair of a paper folding unit.

FIG. 4 is a plan view of a sheet to be folded.

FIG. 5 is a plan view of a sheet to be folded.

FIG. 6 is a plan view of a sheet to be folded.

FIG. 7 is a side view of the saddle stitcher portion.

FIG. 8 is a plan view of a stapled sheet.

FIG. 9 is a side view of the saddle stitcher.

FIG. 10 is a perspective view of a saddle stitcher.

FIG. 11 is a side view of the Z-folded portion.

FIG. 12 is a side view of the Z-folded portion.

FIG. 13 is a side view of the Z-folded portion.

FIG. 14 is a side view of the Z-folded portion.

FIG. 15 is a perspective view of a tab sheet

FIG. 16 is a plan view of a sorting paper and a cutter.

FIG. 17 is a perspective view of a trimmer device.

FIG. 18 is a side view of the trimmer.

FIG. 19 is a side view of the trimmer.

FIG. 20 is a side view of the stapler section.

FIG. 21 is a side view of the stapler section.

FIG. 22 is a side view of an output sheet bundle.

FIG. 23 is a side view of the gluing device section.

FIG. 24 is a side view of the gluing part.

FIG. 25 is a side view of the gluing part.

FIG. 26 is a perspective view of a leading edge / side regulating member of a sheet.

FIG. 27 is a side view of the stacker.

FIG. 28 is a side view of the stacker.

FIG. 29 is a side view of the transport rollers of the stacker.

FIG. 30 is a side view of the transport rollers of the stacker.

FIG. 31 is a side view of the transport rollers when transporting a stack of stackers.

FIG. 32 is a side view of a connecting path portion of a sorter (post-processing device).

FIG. 33 is a plan view of a registration device.

FIG. 34: Action diagram of registration

FIG. 35 is a plan view showing another embodiment of the registration device.

FIG. 36 is a side view of a conventional output paper processing apparatus including a plurality of output paper processing units.

FIG. 37 is a schematic diagram of FIG. 36.

FIG. 38 is a schematic diagram of an output paper processing apparatus according to the present embodiment that includes a plurality of output paper processing units.

[Explanation of symbols]

 21 Photosensitive Drum (Image Forming Section) 51 Stitcher (Stapler) 52 Stapler Unit 54 Trimmer Unit 55 Stitcher Tray 56, 57 Folding Roller 59 Path 61 First Intermediate Tray 62 Second Intermediate Tray 63 Stapler 71 Finisher 72 Binder 73 Stacker 75 Sorter (Sheet sorter) 76, 77 Sorter carriage 208, 209 Folding rollers 406a, 407a Cutter 503 Stacking tray 506 Stapler 702 Conveying belt for holding sheet bundle 705 Tape with glue 707 Heater 708 Sheet conveying means for connecting path 1002 Conveying roller pair (Registration roller pair) 1006, 1007, 1008 Motors 1103, 1104 Paper feed base (transfer paper placement part) 1107 Transfer paper transport path 1101 Main body frame 1102 Paper feed The frame

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Takahashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Shinichi Tanada 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Incorporated (72) Inventor Yoshikuni Toyama 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (3)

[Claims] 1. A registration device for feeding a transfer material to an image forming section at a timing, wherein the transfer roller pair conveys the transfer material, and the transfer material is arranged upstream of the pair of transfer rollers and conveys the transfer material. A detection unit that detects the inclination of the tip of the transfer material in a direction perpendicular to the direction; a means for inclining the conveyance roller pair from a direction perpendicular to the conveyance direction of the transfer material; and a variable rotation speed of the conveyance roller pair. And a means for performing the registration. 2. A detection unit for detecting a position of a transfer material end portion of the transfer material, which is disposed on the downstream side of the transfer roller pair, in a direction perpendicular to the transfer material transfer direction, A registration device comprising means for moving in a direction perpendicular to the direction. 3. A detection unit is provided downstream of the conveyance roller pair, the roller pair being independent of the conveyance roller pair, and detecting a position of an end portion of the transfer material in a direction perpendicular to the transfer material conveyance direction. And a means for moving the independent roller pair in a direction perpendicular to the transfer material conveyance direction.