JP6588283B2 - Sheet stacking device - Google Patents

Description

  The present invention relates to a sheet stacking apparatus that stacks sequentially fed sheets.

  In an image forming apparatus such as a copying machine, a printer, a facsimile machine, or a digital multi-function peripheral, sheets on which images have been applied are sequentially discharged to a subsequent post-processing apparatus, and the introduced sheet is discharged as it is. It is configured to stack on the tray or to perform various post-processing and stack on the tray.

  Even if the sheet is not subjected to special processing in the post-processing device, the image forming device heats the sheet for fixing toner or the like, so that the sheet shrinks non-uniformly, in particular, the end portion is rounded and swollen. (So-called end curl). In the post-processing step, the end of the fed sheets are aligned and aligned to form a bundle, and then saddle stitching is performed, and the bound sheet bundle is folded in half and stacked on the tray. There is a process to go. However, the folded sheet bundle bulges due to the force of returning to the opposite side of the folded sheet bundle. Therefore, in any of the sheet forms, there is a problem that when a large number of sheets are stacked, their bulges are bulky and the stacking efficiency is poor.

  Therefore, in order to increase the number of stacked sheets, there is known a sheet stacking apparatus in which a bulge of stacked sheets and sheet bundles is suppressed by a lever that is pivotable according to the height of the sheets stacked on the tray. (See Patent Document 1).

JP 2006-143466 A

  The above-described lever or the like in the prior art of Patent Document 1 is pushed and retreated by the sheet bundle introduced into the tray, and receives the sheet bundle into the tray. Is rotated and returned to hold the upper surface of the sheet bundle.

  However, since such a lever can be rotated in the introduction direction so as not to interfere with the introduced sheet bundle, as the number of sheets stacked on the tray increases, the position where the sheet bundle is pressed by the lever. Will move toward the end of the tray sheet bundle on the introduction direction side. At this time, since the folded sheet bundle is introduced into the tray with the folded portion at the top, the sheet bundle is in a state where the open end, which is the end opposite to the folded portion, is located on the tray introduction side. It is loaded with.

  For this reason, if the pressing position of the upper surface of the sheet bundle by the lever is moved toward the end of the sheet bundle in the introduction direction of the tray, the open end of the sheet bundle cannot be pressed, and the middle folding is insufficient. In the case of a sheet bundle, the open end may be open. In such a case, the sheet bundle introduced subsequently is introduced into an opened portion of the preceding stacked sheet bundle, which causes a problem of being merged into one bundle. Further, when the succeeding sheet comes out of contact with the open end of the preceding sheet and is pushed out, it becomes impossible to stack the sheets in an aligned state on the tray.

  SUMMARY OF THE INVENTION The present invention provides a sheet stacking apparatus capable of reliably pressing the upper surface of the open end of a sheet bundle with curled ends and a folded sheet bundle in view of the above-mentioned problems.

In order to solve the above problems, a sheet stacking apparatus according to the present invention includes a conveying unit that conveys a sheet, a stacking unit that stacks sheets conveyed in the conveying direction by the conveying unit, and a sheet stacked on the stacking unit . , When the stacking height from the upper surface of the stacking unit is equal to or higher than the first stacking height, the sheet is stacked and the stacking height of the sheet stacked on the stacking unit from the upper surface of the stacking unit is However, the first pressing member that cannot hold the sheet when it is less than the first stacking height, and the stacking height of the sheets stacked on the stacking unit from the upper surface of the stacking unit are pressing the sheet when it is higher second stacking more height than the stacking height of one, the sheets stacked on the stacking unit, stacking height from said upper surface of said stacking means, said second If the sheet is less than the loading height, A Enoi a second pressing member, the second pressing member is a rotatable about a first axis of rotation, the sheet to said stacking means droops in a state which is not loaded The first pressing member is configured to be rotatable about a second rotation axis at a lower end portion of the second pressing member in a state in which no sheets are stacked on the stacking unit. It is characterized by being connected to two pressing members .

The sheet stacking apparatus according to the present invention includes a conveying unit that conveys a sheet, a stacking unit that stacks sheets conveyed in the conveying direction by the conveying unit, and a stacking unit that stacks sheets stacked on the stacking unit. When the stacking height from the upper surface is equal to or higher than the first stacking height, the sheet is pressed, and the stacking height of the sheet stacked on the stacking unit from the upper surface of the stacking unit is the first stacking height. The first pressing member that cannot hold the sheet when the stacking height is less than the stacking height of the stacking unit, and the stacking height of the sheet stacked on the stacking unit from the upper surface of the stacking unit is greater than the first stacking height. The sheet is stacked on the stacking unit when the stacking height from the upper surface of the stacking unit is less than the second stacking height. 2nd press not holding the sheet in case And the first pressing member and the second pressing member have a common rotation fulcrum that is rotatably supported independently of each other, and the first pressing member The second pressing member is arranged in a direction orthogonal to the transport direction and supported by the rotation fulcrum.

  According to the present invention, when the number of sheets stacked on the tray reaches the first stacking height, the first pressing member holds the sheets, and the stacking number reaches the second stacking height. When the press by the pressing member is biased toward the folding side end of the sheet, the second pressing member presses the open end of the sheet, so that the sheet on the tray can be reliably prevented from opening.

1 is an explanatory diagram of an overall configuration of an image forming apparatus. FIG. An explanatory view of a configuration of a sheet post-processing apparatus is shown. The arrangement structure of the 1st press member of the sheet stacking device concerning the present invention, the 2nd press member, and the 3rd press member is shown with a top view. The structure of the 1st press member and the 2nd press member of the sheet | seat stacking apparatus which concerns on this invention is shown with a front view. The relationship between a 1st press member, a 2nd press member, and a 3rd press member is shown with a side view. The block diagram of the principal part of the sheet | seat stacking apparatus explaining arrangement | positioning of a 1st press member and a 2nd press member is shown. The schematic diagram explaining operation | movement when the sheet bundle folded in half is introduced into the tray is shown. FIG. 6 is a schematic diagram for explaining a state in which a folded sheet bundle is stacked on a tray at a first stacking height h1 or higher. FIG. 6 is a schematic diagram for explaining a state in which the folded sheet bundle is further stacked on the tray at a second stacking height h2 or more. Explanatory drawing of another embodiment of a 1st press member and a 2nd press member is shown. The 1st press member and 2nd press member of FIG. 10 are shown with a top view.

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

  First, an image forming apparatus to which the sheet stacking apparatus according to the present invention is effectively applied will be described.

  As shown in FIG. 1, the image forming apparatus 100 includes an image forming apparatus main body A and a sheet post-processing apparatus B installed side by side. The image forming apparatus main body A includes an image forming unit A1, a scanner unit A2, and a feeder unit A3. In the apparatus housing 1, a paper feed unit 2, an image forming unit 3, a paper discharge unit 4, and a data processing unit 5 are incorporated.

  The sheet feeding unit 2 includes cassette mechanisms 2a, 2b, and 2c that respectively store sheets of a plurality of sizes for image formation. The sheet feeding unit 2 feeds sheets of a size designated by a main body control unit (not shown) to the sheet feeding path 6. The cassette mechanisms 2a, 2b, and 2c are detachably installed from the paper feeding unit 2, and each cassette mechanism has a built-in separation mechanism that separates internal sheets one by one and a paper feeding mechanism that feeds out the sheets. The paper feed path 6 is provided with a transport roller that feeds the sheets supplied from the cassette mechanisms 2a, 2b, and 2c to the downstream side, and a registration roller pair that aligns the leading edges of the sheets at the end of the path. Yes.

  Also, a large capacity cassette 2d and a manual feed tray 2e are connected to the paper feed path 6, and the large capacity cassette 2d is composed of an optional unit that stores a large amount of sheets to be consumed. Special sheets such as cardboard sheets, coating sheets and film sheets that are difficult to separate and feed can be supplied.

  The image forming unit 3 includes, for example, an electrostatic printing mechanism, and includes a rotating photosensitive drum 9, a light emitter 10 that emits an optical beam around the photosensitive drum 9, a developing device 11, and a cleaner (not shown). It is the structure which arranged. The illustrated one shows a monochrome printing mechanism, in which a latent image is optically formed on the photosensitive drum 9 by a light emitting device 10, and toner ink is attached to the latent image by a developing device 11.

  Then, in accordance with the timing of image formation on the photosensitive drum 9, the sheet is fed from the paper feed path 6 to the image forming unit 3, and the image is transferred onto the sheet by the transfer charger 12, and the fixing roller 13 disposed in the paper discharge path 14. To fix. A paper discharge roller 15 and a paper discharge port 16 are arranged in the paper discharge path 14 and convey the sheet to a sheet post-processing apparatus B described later.

  The scanner unit A 2 includes a platen 17 on which an image original is placed, a carriage 18 that reciprocates along the platen 17, a photoelectric conversion unit 19, and a photoelectric conversion unit 19 that reflects light reflected from the original on the platen 17 by the carriage 18. And a reduction optical system 20 for guiding the above. The scanner unit A2 includes a travel platen 21, and reads a sheet sent from the feeder unit A3 with the carriage 18 and the reduction optical system 20. The photoelectric conversion unit 19 converts the optical output from the reduction optical system 20 into image data by photoelectric conversion, and outputs the image data to the image forming unit 3 as an electrical signal.

  The feeder unit A3 includes a paper feed tray 22, a paper feed path 23 that guides a sheet fed from the paper feed tray 22 to the travel platen 21, and a paper discharge tray 24 that stores a document read on the platen. Yes.

  FIG. 2 shows a configuration of a sheet post-processing apparatus B that post-processes a sheet on which an image sent from the image forming apparatus main body A is formed. In the sheet post-processing apparatus B, the apparatus housing 27 is disposed at substantially the same height as the housing 1 of the image forming apparatus main body A, and the carry-in port 26 is communicated with the paper discharge outlet 16 of the image forming apparatus main body A.

  The sheet post-processing apparatus B includes a sheet carry-in path 28 through which a sheet from the carry-in entrance 26 is introduced, a first paper discharge path 31, a second paper discharge path 32, and a third branch formed downstream from the sheet carry-in path 28. A paper discharge path 30, a first path switching means 33, and a second path switching means 34 are provided. The first path switching means 33 is constituted by a flapper guide that changes the sheet conveyance direction, and a mode in which the sheet from the carry-in entrance 26 is guided to the third paper discharge path 30 by a driving means (not shown) and the first paper discharge. The mode is switched to the mode of guiding in the direction of the path 31 and the second paper discharge path 32.

  The first paper discharge path 31 and the second paper discharge path 32 can reverse the transport direction of the sheet once introduced into the first paper discharge path 31 and can be switched back to the second paper discharge path 32. It is arranged so as to communicate. The second path switching means 34 is also introduced into the first paper discharge path 31 and the mode in which the sheet sent from the first path switching means 33 is introduced into the first paper discharge path 31 by the driving means (not shown). The mode is switched to the switchback conveyance mode for introducing the sheet into the second paper discharge path 32. In the sheet carry-in path 28, a punch unit 50 for punching punch holes in the carried-in sheet is disposed.

  The sheet post-processing apparatus B then aligns the sheets sent from the first paper discharge path 31 and stacks the sheets sent from the first paper discharge path 31, and the sheets sent from the second paper discharge path 32. A second processing unit B2 that binds the sheet bundle by folding it into a sheet bundle, and a third processing unit B3 that offsets a sheet sent from the third paper discharge path 32 by a predetermined amount in the orthogonal direction. I have. Outside the apparatus housing 27, a first tray 49, a second tray 61, and a third tray 71 on which sheets or sheet bundles that are post-processed and sent by the processing units B 1, B 2, and B 3 are stacked. Prepare.

  The first processing unit B1 includes a processing tray 37 for stacking and stacking sheets sent from the paper discharge port 35, and a stapler unit 47 for binding the stacked sheet bundle. The processing tray 37 is provided below the paper discharge port 35 of the first paper discharge path 31, switches back the conveyance direction of the sheet carried out from the paper discharge port 35, and the sheet is introduced onto the processing tray 37. The Then, the sheet is positioned at a predetermined binding position on the processing tray 37 by the positioning mechanism and bound by the stapler unit 47, and the bound sheet bundle is carried out to the first tray 49 by the sheet bundle carrying-out mechanism.

  The third processing unit B3 sorts the sheets conveyed to the third paper discharge path 30 by offsetting them in the paper discharge orthogonal direction, and stores them in the third tray 71.

  The second processing unit B2 performs the center folding process of the sheet bundle that is closely related to the present invention. The second processing unit B2 aligns and stacks sheets sequentially sent from the first paper discharge path 31 by the switchback conveyance. After the center portion is bound, the sheet is folded into the second tray 61. Therefore, the second tray 61 serves as a stacking unit that stacks the sheet bundle subjected to the folding process.

  The second processing unit B2 includes a guide member 66 that stacks the sheets in a bundle, a restriction stopper 67 that positions the front end of the sheet at a predetermined position on the guide member 66, and a positioned sheet bundle. The second tray 61 by nipping the folding sheet 65, the folding roll pair 64 for folding the sheet bundle at the center after the binding process, the folding blade 65, and the folding blade 65. And a pair of discharge rollers 69 to be sent to

  The saddle stitching staple unit 63 is, as disclosed in Japanese Patent Application Laid-Open No. 2008-184324, Japanese Patent Application Laid-Open No. 2009-051644, and the like, with the sheet unit sandwiched between the head unit and the anvil unit (line). The position is moved along and the binding process is performed.

  In the folding process, the folding blade 65 is inserted into the nip portion of the pair of folding rolls 64 in pressure contact with each other through the folds of the sheet bundle, and the inserted sheet bundle is folded by the rotation of the folding roll pair 64. The pair of rollers constituting the pair of folding rolls 64 is formed of a material having a relatively large friction coefficient such as a rubber roller. For example, by using a soft material such as rubber, the sheet bundle can be accurately transferred while being bent. It is better to line a soft material such as rubber.

  The operation of the second processing unit B2 will be described. The sheets stacked on the guide member 66 are fed to the center portion in the direction orthogonal to the sheet bundle conveying direction of the saddle stitching staple unit 63 by a job end signal from the image forming apparatus main body A. Move to, and bind. The sheet bundle is moved to the folding position when the binding process such as one or two places is completed, and the folding roll pair 64 is rotated. Then, the folding blade 65 is advanced in the folding direction, and the folding blade 65 is retracted when the folding roller 64 is rotated by a predetermined amount. Thereafter, the folded sheet bundle is transferred to a pair of discharge rollers 69 and nipped, and is sent out from the discharge port 62 by the rotation of the discharge rollers 69 and stored in the second tray 61. Therefore, the pair of discharge rollers 69 constitute a conveying unit that conveys the sheet bundle to the tray 69.

  The second tray 61 has an upper surface that receives the sheet bundle inclined downward along the direction in which the sheet bundle is introduced (conveying direction), and a locking portion 68 that stands vertically is formed at the tip. .

  Above the second tray 61, a first pressing member 51, a second pressing member 52, and a third pressing member 53, which are connected to each other, are provided. The second pressing member 52 and the third pressing member 53 are rotatably supported by rotating shafts 54 and 55, respectively. As shown in FIG. 3, the rotating shafts 54 and 55 are respectively mounted on a pair of projecting pieces 58 provided to project outward from the device housing 27.

  As shown in FIG. 4, the first and second pressing members 51 and 52 are each configured by a rectangular flat plate, and the first pressing member 51 has an upper end thereof and a lower end of the second pressing member 52. It is connected by a connecting shaft 59 and can be turned around the connecting shaft 59 as a fulcrum. As shown in FIG. 5, the first pressing member 51 and the second pressing member 52 are suspended by mounting flat weights 72 and 73 on both sides. Therefore, the weights 72 and 73 include a first pressing unit and a second pressing unit for pressing the sheet bundle against the direction in which the first and second pressing members 51 and 52 are conveyed by the sheet bundle 56, respectively. And pressing means. The first and second pressing means may be return springs wound around the rotating shaft 54 and the connecting shaft 59 in addition to the weights 72 and 73.

  The weight 72 does not need to be provided in particular, but when provided, it is preferable that the weight 72 is smaller than the weight of the weight 73 so that the pressing force is smaller than that of the second pressing member 52. This is due to the following reason.

  That is, since the opening of the fold side and the open end of the sheet bundle 56 stacked on the second tray 61 is small if the number of stacked sheets is small, the first pressing member 51 requires a very large pressing force. Not in. On the other hand, if the first pressing member 51 is provided with a large pressing force, a force for regulating the conveyed sheet is applied. Therefore, by setting the pressing force of the first pressing member 51 to be small, it is possible to reduce the regulation of the conveyed sheet bundle while providing the function of pressing the opening of the sheet bundle 56 from above. Thus, at the initial stage when the sheet bundle 56 is stacked on the second tray 61, the sheets can be introduced to the side close to the locking portion 68, and the sheets can be stacked using a wide range of the second tray 61. it can. As a result, the number of stacked sheet bundles 56 can be increased.

  The first and second pressing members 51 and 52 press the sheet bundle 56 at their lower ends. In this case, the height h1 from the upper surface of the second tray 61 is the first height as shown in FIG. The first stacking height at which the upper surface of the sheet bundle is pressed by the pressing member 51, and the height h2 from the upper surface becomes the second stacking height at which the upper surface of the sheet bundle is pressed by the second pressing member 52.

  In addition, the first pressing member 51 and the second pressing member 52 are disposed in the central portion in the direction orthogonal to the direction in which the sheet bundle 56 is conveyed. Therefore, by pressing the center of the width for various sheet widths, it is possible to hold the sheets constant even for different sheet widths.

  Further, the first pressing member 51 and the second pressing member 52 are arranged at a position near the discharge roller 69 side from the center of the second tray 61 in the direction in which the sheet bundle 56 is conveyed. Since the end of the sheet bundle stacked on the second tray 61 and the opening of the sheet bundle are located closer to the discharge roller 69 than the center of the second tray 61 in the sheet conveyance direction, The sheet end and the sheet bundle opening can be securely pressed.

  The third pressing member 53 disposed on the downstream side in the direction in which the sheet bundle 56 is conveyed has a longer dimension in the longitudinal direction than the connected first and second pressing members 51 and 52, and the second tray 61 The rotary shaft 55 is supported so as to extend obliquely downward toward the upper surface. As shown in FIG. 5, the third pressing member 53 is provided with a plurality of shaft-like weights 74 along the longitudinal direction. The weight 74 constitutes third pressing means for pressing the sheet bundle with a stronger force than the first and second pressing members 51 and 52. In addition to the weight 74, the third pressing means may be a return spring wound around the rotation shaft 55.

  Operations of the first, second, and third pressing members 51, 52, and 53 having the above configuration will be described with reference to FIGS.

  When the sheet bundle 56 folded in the second processing section B2 is nipped by a pair of discharge rollers 69 rotating in the clockwise direction and discharged from the discharge port 62 in the direction of arrow A shown in FIG. The second pressing member 51, 52 and the third pressing member 53 are pushed out and advanced onto the second tray 61 (FIG. 7). Then, the sheet bundle 56 sequentially introduced from the discharge port 62 is aligned by the engaging portion 68 of the second tray 61 and stacked and stacked (FIG. 8).

  When the stacking height of the sheet bundle 56 from the second tray 61 exceeds h1 (first stacking height), the first pressing member 51 comes into contact with the sheet bundle 56 at the lower end thereof, and the weight 72 or its own weight. The sheet bundle 56 is pressed by the urging force. Therefore, as the number of stacked sheet bundles 56 on the second tray 61 increases, even if the pressing position of the sheet bundle 56 by the third pressing member 53 moves closer to the locking portion 68 and the pressing position is biased, At this time, since the first pressing member 51 presses the open end of the sheet bundle 56, the opening of the open end is reliably prevented.

  As sheets are stacked on the second tray 61, the repulsive force against the pressing member due to the opening on the fold side and the open end side of the sheet bundle 56 also increases. However, the second pressing member 52 provided with pressing means larger than the first pressing member 51 can counter the increased repulsive force and reliably press the end portion of the sheet bundle 56 and its open end.

  At this time, since the first pressing member 51 and the second pressing member 52 are connected in series at the respective end portions, the second pressing member 51 until the upper surface of the stacked sheets reaches the height of h2. The pressing member 52 remains suspended without rotating.

  However, when the stacking height of the sheet bundle 56 from the second tray 61 exceeds h2 (second stacking height), the lower end portion of the second pressing member 53 and the sheet pressing 56 together with the first pressing member 51. The sheet bundle 56 is pressed by the weights 72 and 73 (FIG. 9).

  Therefore, the first pressing member 51 and the second pressing member 52 rotate together in the above-described predetermined region in the sheet conveyance direction with respect to the second tray 61, and the opening of the sheet can be suppressed. That is, by rotating the first pressing member 51 and the second pressing member 52 in a predetermined region, the upper surface height of the sheets stacked on the second tray 61 exceeds the height h2 and exceeds h2. Furthermore, different pressing forces are applied to the stacked sheets. That is, the pressing force can be changed stepwise by the first pressing member 51 and the second pressing member 52. As a result, the pressing force can be made to correspond to the number of sheets to be stacked, and the functioning area can be made to function without moving significantly.

  FIG. 10 shows a second embodiment in which the first pressing member 51 and the second pressing member 52 are configured to be supported by a common rotating shaft 74. As shown in FIG. 11, the rotation shaft 74 is mounted on a pair of projecting pieces 58 that project outward from the device housing 27, and the first and second pressing members 51, 52 are The rotary shaft 74 is arranged in parallel and is rotatably supported.

  The first and second pressing members 51 and 52 are each formed of a rectangular flat plate having a different length, and as shown in FIG. 10A, a rotating shaft 74 whose upper end is disposed above the discharge port 62. Are supported in common so that they can rotate freely and hang downward. The longitudinal dimension of the first pressing member 51 is longer than the second longitudinal dimension. Although not shown, the first and second pressing members 51 and 52 in the second embodiment also include the above-described weights or return springs corresponding to the first and second pressing means.

  The sheet bundle 56 delivered from the pair of discharge rollers 69 is discharged in the direction of arrow A shown in FIG. 11, and the upper surface of the sheet bundle 56 is moved along the conveyance direction while pushing the first pressing member 51 backward and swinging it clockwise. It is stacked on the second tray 61 formed to be inclined downward. As shown in FIG. 10B, in this case, the height h1 from the upper surface is a stacking height at which the upper surface of the sheet bundle is pressed by the first pressing member 51, and the height h2 from the upper surface is the second height. The stacking height is such that the upper surface of the sheet bundle is pressed by the pressing member 52. Therefore, when the sheets are stacked to a height of h2, the upper surface of the sheets is pushed by the second pressing member 52, so that the open end of the sheet bundle is not opened.

  FIG. 10 shows an example in which the first and second pressing members 51 and 52 are arranged in parallel. However, the first pressing member 51 covers and overlaps the entire second pressing member 52. You may comprise. When arranged in this way, since the arrangement in the direction orthogonal to the sheet conveying direction overlaps with the first and second pressing members 51 and 52, the sheet can be discharged at the same position with respect to the conveyed sheet. It is possible to prevent the sheet bundle from being inclined.

  Furthermore, as a configuration (not shown), only the first pressing member 51 may be used, and the rotary shaft 54 may include two return springs having different elastic forces as pressing means. In the vicinity of the rotation shaft 54 of the first pressing member 51, a locking portion that locks with each spring is provided. The locking portion is locked to the first locking portion that is always locked to the end portion of the first return spring, and the end portion of the second return spring that has a larger elastic force than the first return spring. A second locking portion.

  When the upper surface height of the sheets stacked on the second tray 61 is in the region of height h2, the end of the first return spring and the first engaging portion are engaged, and the height of the upper surface of the sheet is increased. When the height exceeds the height of h2, the end of the second return spring and the second locking portion are locked, and the upper surface height of the sheet is strong against the pressing force up to h2. Can be applied to sheets stacked over h2.

  As described above, when the number of stacked sheets 56 on the second tray 61 is stacked to the first stacking height, the sheet stacking apparatus described in detail presses the sheet bundle 56 with the first pressing member 51 and further stacks the second stack number. The second pressing member 52 and the first pressing member 51 together with the first pressing member 51 press the sheet bundle 56 in a predetermined area on the discharge port 62 side. And curl paper can be reliably prevented from opening. Therefore, the sheet bundle 56 can be stacked on the second tray 61 in a state of being individually aligned.

51 First pressing member 52 Second pressing member 53 Third pressing member 54 Rotating shaft 59 Connecting shaft (fulcrum)
61 Tray (loading means)
69 Discharge roller (conveying means)
72 Weight (first pressing means)
73 Weight (second pressing means)

Claims (7)

Conveying means for conveying the sheet;
A stacking unit for stacking is conveyed in the conveying direction the sheet by said transport means,
The sheet stacked on the stacking unit is pressed when the stacking height from the upper surface of the stacking unit is equal to or higher than the first stacking height , and the stacking of the sheet stacked on the stacking unit is performed. A first pressing member that does not press the sheet when the stacking height from the upper surface of the means is less than the first stacking height ;
The sheets stacked on the stacking unit, the stacking height from the upper surface of the stacking means, pressing the sheet when the is first stacking a second stack or height greater than the height, the loading A second pressing member that does not press the sheet when the stacking height of the sheet stacked on the means from the upper surface of the stacking means is less than the second stacking height ;
The second pressing member is configured to be able to rotate around a first rotation axis and to hang down in a state where sheets are not stacked on the stacking unit,
The first pressing member is formed on the second pressing member so as to be rotatable around a second rotation shaft at a lower end portion of the second pressing member in a state where sheets are not stacked on the stacking unit. A sheet accumulating apparatus characterized by being connected . Conveying means for conveying the sheet;
Stacking means for stacking sheets conveyed in the conveying direction by the conveying means;
The sheet stacked on the stacking unit is pressed when the stacking height from the upper surface of the stacking unit is equal to or higher than the first stacking height, and the stacking of the sheet stacked on the stacking unit is performed. A first pressing member that does not press the sheet when the stacking height from the upper surface of the means is less than the first stacking height;
When the stacking height of the sheets stacked on the stacking unit from the upper surface of the stacking unit is equal to or higher than a second stacking height higher than the first stacking height, the sheet is pressed and the stacking unit A second pressing member that does not press the sheet when the stacking height of the sheet stacked on the means from the upper surface of the stacking means is less than the second stacking height;
The first pressing member and the second pressing member each have a common rotation fulcrum that independently and rotatably supports,
The sheet stacking apparatus, wherein the first pressing member and the second pressing member are arranged in a direction orthogonal to the conveying direction and supported by the rotation fulcrum. The first pressing member has a first pressing means for pressing the sheets stacked on said stacking means,
Said second pressing member, the sheet stacking apparatus according to claim 1 or 2, characterized in that a second pressing means for pressing the sheets stacked on said stacking means. The sheet stacking apparatus according to claim 3 , wherein the first and second pressing units are weights. The sheet stacking apparatus according to claim 3 , wherein the first and second pressing units are springs. A third press member for pressing said first pressing member and the sheet stacked on the stacking unit with a strong force from the second pressing member,
In the case where the first pressing member, the second pressing member, and the third pressing member press the sheets stacked on the stacking means, the position where the third pressing member presses the sheets is in the conveyance direction, sheet of any one of claims 1 to 5 wherein the first pressing member and said second pressing member is characterized that you located downstream side of a position to press the sheet Integrated device. A folding processing unit that performs folding processing on the sheet;
The conveying means conveys the sheet subjected to the folding processing by the folding processing section to the stacking means in a state where the fold of the sheet is located downstream of the open end of the sheet with respect to the conveying direction. The sheet stacking apparatus according to claim 1, wherein the sheet stacking apparatus is a sheet stacking apparatus.

Images