JP2009062111A - Sheet post-processing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently stack a great number of sheets on a small-size sheet discharge tray. <P>SOLUTION: This sheet post-processing device comprises a stacking means having a sheet supporting guide for stacking sheet bundle while holding the sheet bundle to be discharged between the guide and a sheet discharge means. The sheet discharge means is a sheet discharge impeller which has a blade fixed along the circumferential direction for discharging the sheet bundle, which is provided in at least one stage in the axial direction of a rotating shaft, and which is turned to guide the sheet bundle after bound, to the stacking means. The impeller consists of the blade and a sheet bundle discharge guide, and it holds the sheets therebetween to guide the sheet bundle to the stacking means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention receives an image forming apparatus or a sheet (recording paper) discharged from the image forming apparatus or the like, and performs post-processing such as sorting, stacking, stapling, and the like after the sheet discharged to the stack tray The present invention relates to a processing apparatus.

  2. Description of the Related Art A sheet post-processing apparatus that performs post-processing of a sheet on which an image is formed in an image forming apparatus and discharged from the apparatus is known. Sheet post-processing by the sheet post-processing apparatus includes stack processing for stacking sheets on a sheet-by-part basis and stacking them on a paper discharge tray, and stapling processing for binding sheets to a predetermined number and stacking them on a stack tray. Some stapling processes enable saddle stitching in addition to edge stitching.

  For saddle-stitched sheet bundles, the stacking amount of the sheet bundle becomes a problem, and as a technique considering this stacking amount, the folded sheet bundle can be stacked at an appropriate position on the stopper tray. As an object, there is a type in which a half-folded sheet bundle discharged by a pair of discharge rollers is applied to a sheet stopper and a half-folded sheet bundle is stacked vertically.

  Further, as a technique that considers stacking of sheet bundles in a horizontal direction, a known example such as Patent Document 1 is known, which is configured to sandwich a sheet bundle between an auxiliary tray and a pressing member and horizontally It is possible to load a large amount by stacking on the top.

Here, while holding the saddle stitch book to be cut by the press roller, the cutting position is positioned, the cutting blade is lowered, and the small edge portion of the saddle stitch book is cut, so that the recorded sheets are sequentially received and accepted. After binding the central position with respect to the transport direction of the bundle of sheets, the folding blade is acted on the binding position of the bound bundle of sheets to fold the bound bundle of paper with a press roller. In a paper post-processing apparatus for producing a saddle stitch book by strengthening the folded state by carrying it while holding it, a technique is disclosed that can accurately and cleanly cut the fore edge portion of the saddle stitch book (for example, Patent Document 2).
JP 2004-099236 A Japanese Patent No. 3875802

  When a sheet bundle that has been saddle-stitched in a conventional finisher is discharged and stacked on a discharge tray, the difference in sheet thickness between the binding portion side and the opening side of the sheet bundle increases depending on the number of sheets bundled. I couldn't load a large amount of order. As a result, when a large amount of paper is stacked on the paper discharge tray in the vertical direction, the paper discharge tray tends to be enlarged. Also, when trying to stack in the horizontal direction, the control and mechanism tend to be complicated, such as the angle of the auxiliary tray must be changed depending on the number of sheets to be bound.

  The present invention has been made in view of such a situation. In the present invention, the sheet bundle to be discharged has a sheet support guide in the stacking unit, and the sheet bundle to be discharged is sandwiched between the guide and the sheet discharge unit. The purpose is to stack a bundle of sheets efficiently and in large quantities even with a small discharge tray.

  The sheet post-processing apparatus according to claim 1 includes a tray that collects sheets discharged from the image forming apparatus inside the machine, binds an intermediate position of the sheet bundle, folds and binds the book at the intermediate position, and discharges the book. A paper post-processing apparatus that discharges paper by paper means and stacks it on a stacking means, and has a paper support guide in the stacking means, and holds the paper bundle to be discharged between the guide and paper discharge means. In the sheet post-processing apparatus, the sheet discharge means includes at least one impeller in which the blades for discharging the sheet bundle are fixed along the circumferential direction in the axial direction of the rotation shaft. And a paper discharge impeller configured to guide the bundle of sheets after binding to the stacking means by rotating, and the impeller includes blades and a sheet bundle discharge guide, thereby holding the paper. To guide the stack of paper to the stacking means And features.

  The sheet post-processing apparatus according to claim 2 is the sheet post-processing apparatus according to claim 1, wherein in the paper discharge unit, the paper bundle discharge guide of the paper discharge impeller is variable according to the thickness of the paper bundle. Features.

  The sheet post-processing apparatus according to claim 3 is the sheet post-processing apparatus according to claim 1 or 2, wherein the sheet discharge unit sandwiches the sheet when the blades of the sheet discharge impeller have two or more stages. It is characterized in that the position of the sheet bundle discharge guide is different between the blades and the blades that are not.

  The sheet post-processing apparatus according to claim 4 is the sheet post-processing apparatus according to claim 1, wherein in the paper discharge unit, the paper discharge impeller is disposed at a position where the paper bundle is parallel to the paper support guide. Means for keeping the pressure constant so that the pressure between the paper support guide and the paper discharge means is always constant regardless of the amount of paper bundles in the stacking means. Thus, the pressure on the stack of stacked sheets is always constant.

  A sheet post-processing apparatus according to a fifth aspect of the present invention is the sheet post-processing apparatus according to the first or fourth aspect, wherein in the discharge means, the means for maintaining a constant pressure always applies a constant pressure between the paper support guide and the discharge means. By providing a spring that can be applied, the sheet stacking pressure is always kept constant.

  A sheet post-processing apparatus according to a sixth aspect of the present invention is the sheet post-processing apparatus according to the first or fourth aspect, wherein in the discharging means, the means for keeping the pressure constant has a driving means in the paper support guide, Accordingly, the pressure between the discharging means and the paper support guide is made constant.

  A sheet post-processing apparatus according to a seventh aspect of the present invention is the sheet post-processing apparatus according to the first aspect, wherein an auxiliary guide that is movable in the stacking unit is provided in parallel with the sheet support guide. It is characterized by that.

  The sheet post-processing apparatus according to an eighth aspect is the sheet post-processing apparatus according to the first or seventh aspect, wherein the auxiliary guide is configured to be movable.

  The sheet post-processing apparatus according to claim 9 is the sheet post-processing apparatus according to claim 1 or 7, wherein the auxiliary guide is configured such that a guide surface is divided and each of the auxiliary guides is individually movable. To do.

  A sheet post-processing apparatus according to a tenth aspect of the present invention is the sheet post-processing apparatus according to any one of the first, seventh, eighth, and ninth aspects, wherein the auxiliary guide reaches a guide position at the time of stacking when the sheet bundle is discharged. It is configured to move, and the moving guide surface is configured to be different depending on the size of the sheet bundle.

  The sheet post-processing apparatus according to claim 11 is the sheet post-processing apparatus according to any one of claims 1, 7, 8, 9 and 10, wherein the auxiliary guide has a small sheet bundle to be stacked. In this case, only one of the subdividable auxiliary guides moves, and in the case of a large size, all of the dividable guides move at the same time.

  The sheet post-processing apparatus according to claim 12 is the sheet post-processing apparatus according to claim 1 or 11, wherein the auxiliary guide is configured such that the auxiliary guide divided by one driving unit moves. And

  A sheet post-processing apparatus according to a thirteenth aspect is the sheet post-processing apparatus according to the first aspect, wherein in the stacking means, each of the auxiliary guide and the discharge means has a sheet detection means, and is based on a discharge impeller. It has a detecting means for judging whether the loading situation is normal.

  A sheet post-processing apparatus according to a fourteenth aspect is the sheet post-processing apparatus according to the first or thirteenth aspect, wherein in the stacking unit, the detecting unit can detect the presence or absence of stacked sheets together with the stacking state. It is configured.

  The sheet post-processing apparatus according to claim 15 is the sheet post-processing apparatus according to claim 1, wherein in the stacking unit, the sheet support guide moves when there is no paper, and the home position of the sheet support guide is detected. It has the means to detect, It is characterized by the above-mentioned.

  The sheet post-processing apparatus according to claim 16 is the sheet post-processing apparatus according to any one of claims 1, 13 and 14, wherein the sheet detecting means of the discharging means detects the sheet bundle in the stacking means. In this case, when the auxiliary guide moves and the detection means of the auxiliary guide also detects the paper bundle, it is determined that the stacking condition is normal, and the detection means of the discharge means detects the paper bundle, but the detection of the auxiliary guide Control means is provided for determining that the stacking condition is abnormal when the means does not detect the sheet bundle.

  The sheet post-processing apparatus according to claim 17 is the sheet post-processing apparatus according to claim 1 or 15, wherein when the sheet detecting unit recognizes the stacking state as described above, the sheet support guide is not in the home position. The auxiliary guide has a control means for stopping discharge of the sheet bundle by returning to the home position.

  The sheet post-processing apparatus according to claim 18 is the sheet post-processing apparatus according to any one of claims 1 and 13 to 17, wherein in the stacking unit, when there is no stacked sheet, the knowledge unit included in the discharge unit In addition, the detection means of the auxiliary guide determines that there is no paper, and the auxiliary guide is at the home position, and the paper support guide is also configured to be the home position of the stacking means when the home position detection means detects the home position. It is characterized by being.

  The sheet post-processing apparatus according to claim 19 is the sheet post-processing apparatus according to claim 1, wherein the stacking unit includes a sheet stacking cover, and when removing a bundle of sheets, the sheet supporting guide is opened by removing the cover. The sheet support guide is configured to move to a position that is normal for stacking the sheet bundle by closing the cover.

  The sheet post-processing apparatus according to claim 20 is the sheet post-processing apparatus according to claim 1 or 19, wherein, in the stacking means, the sheet support guide has a pressure release lever, and the sheet stacking cover is opened. This lever is operated, and is configured to stop the movement of the paper support guide by releasing the pressure.

  The sheet post-processing apparatus according to claim 21 is the sheet post-processing apparatus according to claim 1 or 19, wherein, in the stacking unit, the sheet support guide includes a pressure release member, and the sheet stacking cover is opened. It is characterized in that the drive source for allowing the paper support guide to be moved by the pressure releasing member is made impossible to transmit.

  The sheet post-processing apparatus according to claim 22 is the sheet post-processing apparatus according to any one of claims 1, 17 and 19, wherein the stacking means includes means for detecting fullness to detect fullness. In such a case, the auxiliary guide returns to the home position and stops discharging the sheet bundle, and the paper stacking cover is opened, and the cover is opened to release the pressure of the adoption support guide so as to prompt the removal of the sheet bundle. It is configured.

  According to the present invention, the sheet bundle to be ejected has the paper support guide in the stacking unit, and the paper bundle to be ejected is sandwiched between the guide and the sheet ejecting unit to stack the sheet bundle. However, it can be efficiently loaded in large quantities.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a schematic explanatory view of a sheet post-processing apparatus according to an embodiment of the present invention.

  The paper discharged from the copying machine or the like (A) is carried in from the entrance guide plate (1) and carried into the paper post-processing apparatus (B) by the transport rollers (2) and (3).

  The sheet carried into the sheet post-processing apparatus is branched into a proof conveyance path, a sort conveyance path, and a staple conveyance path by branch claws (4) and (5).

  The sheet carried into the proof conveyance path is discharged to the proof tray (8) by the conveyance roller (6) and the paper discharge roller (7).

  The sheets carried into the sort conveyance path are discharged to the stacking tray (11) by the conveyance roller (9) and the paper discharge roller (10).

  The sheet carried into the staple transport path is discharged to the staple tray (15) by the transport rollers (12), (13), (14) and the staple discharge roller (15), and is then transferred to the reference fence (17) by the tapping roller (16). After being dropped, it is aligned by the jogger fence (18), and in the case of end binding, it is bound to a predetermined position by the stapler (19), and discharged to the stacking tray (11) by the discharge claw and the discharge roller (10). Is done. In the case of saddle stitching, the paper is aligned by the jogger fence (18), and is bound to the center of the paper by the saddle stitching stapler (20), and the paper in the folded portion is ejected by the discharge claw, discharge roller (21), and transport roller (22). The paper is conveyed to the folding stopper (23), folded in half by the paper folding blade (24) and the paper folding roller (25), and discharged to the saddle stitching tray (27) by the paper discharge roller (26).

  As shown in FIG. 2, the saddle stitched sheet bundle (P) is discharged from the discharge roller (26) to the discharge impeller (200). The paper discharge impeller (200) that receives the sheet bundle (P) rotates and rotates the sheet bundle (P) in a direction perpendicular to the tray. Thereafter, the sheet is ejected onto the tray while being pushed by the guide shape of the sheet ejection impeller, and loaded in a form sandwiched between the sheet ejection impeller (200) and the sheet support guide (301) as shown in FIG. . The sheet support guide (301) is configured to be variable according to the thickness of the sheet bundle.

  Also, as shown in FIG. 4, the guide indicating member (401) can be adjusted by a spring (403) so that the guide (402) position is different between the blade that holds the sheet bundle and the blade that is not. Yes.

  The paper support guide (202) is configured to move in conjunction with the stacking belt (203) when the paper discharge impeller pushes out the paper bundle (P).

FIG. 5 is an explanatory diagram showing the configuration of the paper support guide (202).
The paper support guide (202) is provided with a spring (501) that does not change the pressure depending on the thickness or amount of the paper bundle so that the paper bundle (P) can be held between the paper discharge impeller. It is configured to always apply a certain pressure.

  FIG. 6 shows a configuration in which a constant pressure is always applied to the sheet bundle stacked by the motor (601).

FIG. 7 is an explanatory view showing the structure of the auxiliary guide (701).
This is a control means that operates when it is detected that the sheet bundle impeller (200) is nipped when the sheet bundle is discharged, and does not interfere with discharging the sheet bundle to the stacking tray. It has a configuration like this.

  The auxiliary guide (701) is composed of two guides (710-a, 710-b) as shown in FIG. 7A, each having a solenoid (720-a, 720-b), and a sheet bundle to be discharged. The guide that operates according to the size of the camera is configured to be different.

  Further, as shown in FIG. 7B, it is configured to be movable by a single motor (712), and the position of the connecting member (711) is configured to be different depending on the size of the sheet bundle to be discharged. When the connecting member (711) is positioned as shown in FIG. 7 (b) -1, the auxiliary guides (710-a, 710-b) are moved from the motor (712) via the timing belt (713) to the gear (714). The two auxiliary guides are operated simultaneously by the rack (715).

  When the connecting member (711) is in the position as shown in FIG. 7 (b) -2, only the auxiliary guide (710-a) operates.

FIG. 8 is an explanatory diagram showing the configuration of the detection means when loading paper.
A home position sensor (801) and a paper detection sensor (802) are attached to the auxiliary guide (701). A paper detection sensor (803) is also attached to the paper discharge impeller (200), and a home position sensor (804) is attached below the paper support guide (701).

  When the paper detection sensor (802) detects, the auxiliary guide (701) starts to move and is controlled so as to leave the home position.

  After the sheet bundle is discharged, if the sheet detection sensor (802) of the auxiliary guide (701) and the sheet detection sensor (803) of the discharge impeller (200) detect the sheet as shown in FIG. Control is performed so that the paper detection sensor determines that the state is normal and the paper detection sensor is not detected by either one as shown in FIG. 8B. When it is determined that the stacking state is abnormal, the auxiliary guide (701) is returned to the home position and controlled to stop the discharge of the next sheet bundle.

  As shown in FIG. 8C, when there is no sheet bundle on the stacking belt (203), the sheet detection sensor (802) of the auxiliary guide (701) and the sheet detection sensor (803) of the discharge impeller (200). ) Is not detected and it is determined that there is no paper. When there is no sheet, control means is provided to return the sheet support guide (202) and the auxiliary guide (701) to the home position.

  When each sensor is in the state shown in FIG. 8D, the home position of the saddle stitching tray (27) at the start of operation is determined, and it is determined whether or not the saddle stitching tray (27) can be stacked. It is possible to control.

  9 and 10 are diagrams for explaining the configuration of the means for releasing the pressure between the paper support guide (202) and the paper discharge impeller (200).

  FIG. 9 shows a case where pressure is applied between the paper support guide (202) and the paper discharge impeller (200) by a constant pressure load spring (501). A cover (901) is attached to the saddle stitching tray (27), and when removing the paper stacked on the tray, the cover door (902) is opened to take out the paper. At this time, by opening the door (902), the lever (903) provided on the paper support guide (202) stops the operation by the spring and releases the pressure. When the door is closed, the lever (903) is released from the spring, and a constant pressure is applied again.

  FIG. 10 shows a case where pressure is applied between the paper support guide (202) and the paper discharge impeller (200) by the motor (601).

  By opening the door (902), the motor (1001) rotates and the eccentric cam (1004) is operated from the gear (1006) via the link (1005), and the position of the pulley (1003) is shown in FIG. By changing to 10 (b), the drive transmission from the motor (601) becomes impossible and the pressure is released. The motor (1001) for closing the door is rotated, and the attack is such that pressure is applied again.

FIG. 11 is a diagram for explaining the configuration when the sheet bundle is full in the tray.
The paper support guide is provided with a shielding plate (1102). As shown in the left diagram of FIG. 11, the tray full detection sensor (1101) detects this and the paper detection sensor (110) of the auxiliary guide (701). 802) and a state where the paper detection sensor (803) of the paper discharge impeller (200) detects the paper is determined to be full.

  If it is determined that the space is full, the auxiliary guide (701) returns to the home position and enters the state shown in the right figure of FIG.

  As a result, the sheet bundle discharging control is stopped, and the door (902) of the cover (901) is opened on the saddle stitching tray (27). As a result, the pressure of the paper support guide is released, and control is performed to prompt removal of the paper bundle in the tray.

The purpose or effect for each claim is described below.
2. The sheet post-processing apparatus according to claim 1, wherein the sheet bundle to be discharged has a sheet support guide in the stacking unit, and the sheet bundle is stacked by sandwiching the sheet bundle to be discharged between the guide and the sheet discharge unit. Thus, even a small paper discharge tray can be efficiently stacked in large quantities.

  In the sheet post-processing apparatus according to claim 2, a small number of sheets are provided in the sheet discharge unit so that the sheet bundle discharge guide of the sheet discharge impeller can be changed according to the thickness of the sheet bundle. Even if it is a large quantity, it can be efficiently loaded.

  In the sheet post-processing apparatus according to claim 3, in the paper discharge unit, when there are two or more blades of the paper discharge impeller, the position of the paper bundle discharge guide is determined by the blade that holds the paper and the blade that does not. By being configured differently, even when a sheet is nipped, it is possible to wait for nipping the next sheet to be discharged, so that it is possible to cope with any discharge speed.

  5. The sheet post-processing apparatus according to claim 4, wherein in the paper discharge means, the paper discharge impeller is configured to move from the impeller to the stacking means at a position where the sheet bundle is parallel to the paper support guide. In the stacking means, there is a means for keeping the pressure constant so that the pressure between the paper support guide and the paper discharge means is always constant regardless of the amount of the sheet bundle. Since the pressure on the bundle is always constant, it is possible to stack the sheets satisfactorily without any folding on the sheets regardless of the number of stacked sheets.

  6. The sheet post-processing apparatus according to claim 5, wherein in the discharge means, the means for keeping the pressure constant is provided by providing a spring capable of always applying a constant pressure between the paper support guide and the discharge means. It is possible to apply a constant pressure with a simple configuration and to stack a stack of sheets satisfactorily by keeping the pressure of the ink constant at all times.

  In the sheet post-processing apparatus according to claim 6, in the discharge means, the means for keeping the pressure constant has a drive means in the paper support guide, and the pressure between the discharge means and the paper support guide is adjusted according to the stacking amount of the paper bundle. By keeping the pressure constant, it is possible to easily adjust the pressure, and it is possible to stack a stack of sheets satisfactorily.

  8. The sheet post-processing apparatus according to claim 7, wherein in the stacking unit, an auxiliary guide that is movable is provided on the stacking unit in parallel with the sheet support guide, so that the sheet bundle can be stacked in an orderly manner. Is possible.

  In the sheet post-processing apparatus according to claim 8, since the auxiliary guide is configured to be movable, it is possible to prevent the discharge unit from being obstructed by moving only when the sheet is discharged. .

  In the sheet post-processing apparatus according to claim 9, the guide surface of the auxiliary guide is divided, and each guide surface is configured to be individually movable, so that the guide surface that moves according to the sheet size can be different. At the same time, it is possible to prevent the discharge means from being hindered.

  11. The sheet post-processing apparatus according to claim 10, wherein the auxiliary guide is configured to move to a guide position at the time of stacking when the sheet bundle is discharged, and the guide surface that moves varies depending on the size of the sheet bundle. As a result, it is possible to stack sheets of any size in an orderly manner and prevent the discharge means from being hindered.

  12. The sheet post-processing apparatus according to claim 11, wherein only one of the auxiliary guides that can be divided moves when the stack of sheets to be stacked is a small size, and all of the auxiliary guides that can be divided when the size is large. The guides are configured to move at the same time, so that sheets of any size can be stacked in an orderly manner.

  13. The sheet post-processing apparatus according to claim 12, wherein the auxiliary guide is configured so that the auxiliary guide divided by one driving unit moves, so that the sheet can be stacked in an orderly manner on any size paper with an inexpensive configuration. Is possible.

  14. The sheet post-processing apparatus according to claim 13, wherein in the stacking unit, each of the auxiliary guide and the discharge unit includes a sheet detection unit, and detects whether the stacking state by the discharge impeller is normal. By having the means, it is possible to prevent a loading abnormality in the loading means.

  15. The sheet post-processing apparatus according to claim 14, wherein in the stacking unit, the detecting unit is configured to be able to detect the presence or absence of stacked sheets as well as the stacking state, whereby a stacking abnormality in the stacking unit is detected. It is possible to check the presence or absence of the loaded paper and to stack the sheets in an orderly manner.

  The sheet post-processing apparatus according to claim 15, wherein the stacking unit includes a detecting unit that detects a home position of the paper support guide by moving the paper support guide when there is no paper, Even in such a case, the sheets can be stacked in an orderly manner by returning the sheet support guide to the home position.

  17. The sheet post-processing apparatus according to claim 16, wherein, in the stacking means, when the paper detection means of the discharge means detects the paper bundle, the auxiliary guide moves, and the detection means of the auxiliary guide also detects the paper bundle. The stacking state is determined to be normal, and the detection unit of the discharge unit detects the sheet bundle. However, if the detection unit of the auxiliary guide does not detect the sheet bundle, the stacking state is determined to be abnormal. By having a simple control means, it is possible to handle even when there is a loading abnormality.

  In the sheet post-processing apparatus according to claim 17, when the paper detection unit recognizes the stacking state as described above, the paper support guide is not in the home position, but the auxiliary guide returns to the home position, thereby By having a control means for stopping the discharge, it is possible to prevent further loading failures when a loading abnormality occurs.

  In the sheet post-processing apparatus according to claim 18, in the stacking unit, when there is no stacked sheet, the knowledge unit of the discharge unit and the detection unit of the auxiliary guide determine that there is no paper, and the auxiliary guide is at the home position. At the same time, the paper support guide is also configured so that the home position detection means detects the home position as the home position of the stacking means, so that it is possible to determine whether or not the sheets can be stacked at the start of operation. Is possible.

  In the sheet post-processing apparatus according to claim 19, the stacking means has a sheet stacking cover, and when removing a bundle of sheets, the movement of the sheet support guide is stopped by opening the cover. When the cover is closed, the paper support guide is moved to a position that is normal for stacking paper bundles, so that when removing the paper, the paper support guide does not operate and the operator's hand is caught. It is possible to avoid such dangers.

  21. The sheet post-processing apparatus according to claim 20, wherein in the stacking means, the sheet support guide has a pressure release lever, and when the sheet stacking cover is opened, the lever is operated to release the pressure to support the sheet support. Since the guide movement is stopped, the paper support guide does not operate when removing the paper even when a constant pressure is applied to the paper bundle, and the operator's hand may be caught. Can be avoided.

  22. The sheet post-processing apparatus according to claim 21, wherein in the stacking means, the sheet support guide has a pressure releasing member, and the sheet support guide is moved by the member by opening the sheet stacking cover. Is configured to stop the movement of the paper support guide by releasing the pressure that is configured to disable the transmission of paper, even when a constant pressure is applied to the stack of paper, the paper should be removed. The support guide does not operate, and it is possible to avoid danger such as pinching the operator's hand.

  23. The sheet post-processing apparatus according to claim 22, wherein the stacking means includes means for detecting fullness, and when the fullness is detected, the auxiliary guide returns to the home position and stops discharging the sheet bundle. The paper stacking cover is opened, and the pressure of the paper support guide is released by opening the cover. With this configuration, it is possible to improve the take-out property of the loaded paper when the stacked paper is full.

  Each of the above-described embodiments is a preferred embodiment of the present invention, and various modifications can be made without departing from the scope of the present invention.

1 is an overall configuration diagram of a sheet post-processing apparatus. FIG. 3 is a schematic view of a guide and a discharge impeller. FIG. 1 is a configuration diagram 1 of a paper ejection impeller paper sandwiching mechanism. FIG. 3 is a configuration diagram 2 of a paper ejection impeller paper sandwiching mechanism. FIG. 2 is a configuration diagram of a paper support guide. FIG. 3 is a configuration diagram of a paper support guide. It is an auxiliary guide block diagram. FIG. 3 is a configuration diagram of detection means when paper is loaded. It is a pressure release means block diagram. It is a pressure release means block diagram. It is a full detection block diagram.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Entrance guide plate 2, 3 Conveyance roller 4, 5 Branch claw 5 2nd interlayer insulation film 6 Conveyance roller 7 Paper discharge roller 8 Proof tray 9 Conveyance roller 10 Paper discharge roller 11 Stacking tray 12, 13, 14 Conveyance roller 15 Staple Paper discharge roller 16 Tataki roller 17 Reference fence 18 Jogger fence 19 Stapler 20 Saddle stitching stapler 21 Release roller 22 Transport roller 23 Paper folding stopper 24 Paper folding blade 25 Paper folding roller 26 Paper ejection roller 27 Saddle binding tray

Claims (22)

It has a tray that collects the sheets discharged from the image forming apparatus inside the machine, binds the intermediate position of the sheet bundle, folds and binds at the intermediate position, discharges the sheet by the discharge unit, and stacks it on the stack unit A sheet post-processing apparatus having a sheet support guide in the stacking unit and stacking the sheet bundle by sandwiching the sheet stack to be discharged between the guide and the sheet discharge unit. In
The paper discharge means includes one or more impellers fixed in the circumferential direction with blades for discharging the paper bundle in the axial direction of the rotating shaft, and is rotated to rotate the paper bundle after binding. Is a paper discharge impeller configured to guide the paper to the stacking means, and the impeller includes a blade and a paper bundle discharge guide, and thereby guides the paper bundle to the stacking means by sandwiching the paper. Sheet post-processing device.   2. The sheet post-processing apparatus according to claim 1, wherein in the paper discharge means, the paper bundle discharge guide of the paper discharge impeller is variable according to the thickness of the paper bundle.   In the paper discharge means, when there are two or more blades of the paper discharge impeller, the position of the sheet bundle discharge guide is different between the blade holding the paper and the blade not holding it. Item 3. The sheet post-processing apparatus according to Item 1 or 2.   In the paper discharge means, the paper discharge impeller is configured to move from the impeller to the stacking means at a position where the paper bundle is parallel to the paper support guide. Even if there is, it has means to keep the pressure constant so that the pressure between the paper support guide and the paper discharge means is always constant, and this also means that the pressure on the stacked paper bundle is always constant The sheet post-processing apparatus according to claim 1.   In the discharge means, the means for keeping the pressure constant is characterized in that the pressure of the sheet bundle is always kept constant by providing a spring capable of always applying a constant pressure between the paper support guide and the discharge means. The sheet post-processing apparatus according to claim 1 or 4.   2. The discharge means according to claim 1, wherein the means for keeping the pressure constant has a drive means in the paper support guide, and the pressure between the discharge means and the paper support guide is made constant according to the stacking amount of paper bundles. The sheet post-processing apparatus according to 4.   2. The sheet post-processing apparatus according to claim 1, wherein in the stacking unit, a movable auxiliary guide is provided in parallel to the sheet support guide.   8. The sheet post-processing apparatus according to claim 1, wherein the auxiliary guide is configured to be movable.   8. The sheet post-processing apparatus according to claim 1, wherein a guide surface of the auxiliary guide is divided, and each of the auxiliary guides is configured to be individually movable.   2. The auxiliary guide is configured to move to a guide position at the time of stacking when the sheet bundle is discharged, and the guide surface to be moved differs according to the size of the sheet bundle. The sheet post-processing apparatus according to any one of 7, 8, and 9.   The auxiliary guide is configured so that only one of the subdividable auxiliary guides moves when the stack of sheets to be stacked is small, and all of the subdividable guides move simultaneously when the stack is large. The sheet post-processing apparatus according to any one of claims 1, 7, 8, 9, and 10.   12. The sheet post-processing apparatus according to claim 1, wherein the auxiliary guide is configured such that the auxiliary guide divided by one driving unit moves.   2. The stacking unit according to claim 1, wherein each of the auxiliary guide and the discharge unit includes a sheet detection unit, and the detection unit determines whether the stacking state by the discharge impeller is normal. Sheet post-processing equipment.   14. The sheet post-processing apparatus according to claim 1, wherein in the stacking unit, the detection unit is configured to be able to detect the presence / absence of stacked sheets together with a stacking state.   2. The sheet post-processing apparatus according to claim 1, wherein the stacking unit includes a detecting unit that detects a home position of the sheet support guide by moving the sheet support guide when there is no paper.   In the stacking means, when the paper detection means of the discharge means detects the paper bundle, the auxiliary guide moves, and when the detection means of the auxiliary guide also detects the paper bundle, it is determined that the stacking condition is normal, and the discharge means The detecting means detects a sheet bundle, but has a control means for determining that the stacking condition is abnormal when the auxiliary guide detecting means does not detect the sheet bundle. The sheet post-processing apparatus according to any one of 1, 13, and 14.   In the paper detection means, when the stacking status is recognized as above, the paper support guide is not in the home position, but the auxiliary guide has a control means for stopping discharge of the paper bundle by returning to the home position. The sheet post-processing apparatus according to claim 1 or 15.   In the stacking means, when there is no stacked paper, the knowledge means of the discharge means and the detection means of the auxiliary guide determine that there is no paper, the auxiliary guide is at the home position, and the paper support guide is also the home position detection means. 18. The sheet post-processing apparatus according to claim 1, wherein when the home position is detected, the home position of the stacking unit is set.   The stacking means includes a sheet stacking cover, and when removing a bundle of sheets, the movement of the sheet support guide is stopped by opening the cover, and the sheet support guide is configured to stack the sheet bundle by closing the cover. 2. The sheet post-processing apparatus according to claim 1, wherein the sheet post-processing apparatus is configured to move to a normal position.   In the stacking means, the sheet support guide has a pressure release lever, and the lever is operated by opening the sheet stack cover, and the movement of the sheet support guide is stopped by releasing the pressure. The sheet post-processing apparatus according to claim 1 or 19,   In the stacking means, the sheet support guide has a pressure release member, and is configured to be unable to transmit a drive source for allowing the sheet support guide to be moved by the pressure release member by opening the sheet stack cover. The sheet post-processing apparatus according to claim 1 or 19,   The stacking means has a means for detecting fullness, and when full is detected, the auxiliary guide returns to the home position to stop discharging the sheet bundle, and the paper stacking cover is opened and the adoption opens. 20. The sheet post-processing apparatus according to claim 1, wherein pressure release of the support guide is performed to facilitate removal of the sheet bundle.

Images