JP4325239B2 - Sheet stacking device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet stacking apparatus including a stacking tray in which folded sheets and unfolded sheets can be discharged and stacked together, and in particular, a sheet processing apparatus including a folding processing unit and a combination of the sheet processing apparatuses are used. The present invention relates to a sheet stacking apparatus applicable to an image forming apparatus such as a copying machine, a printer, and a multifunction machine.
[0002]
[Prior art]
In recent years, sheet processing apparatuses having a stacking tray capable of stacking a large amount of sheets such as paper have been commercialized and have appeared on the market.
[0003]
However, in such a sheet processing apparatus, as illustrated in FIG. 29, when a large number of folded sheets Pz are stacked on the stacking tray 200, the folded portions overlap each other and rise up. As a result, the outlet 210 is blocked, and as a result, there is an obstacle to discharge of the succeeding folded sheets Pz or unfolded sheets to the stacking tray 200, and a large number of folded sheets cannot be stacked.
[0004]
For this reason, conventionally, in view of the above-described circumstances, a proposal has been made regarding a discharged sheet stacking apparatus that has an object of increasing the stacking amount of a folded sheet (Patent Document 1).
[0005]
As shown in FIG. 30, the sheet stacking apparatus is provided with an auxiliary tray 220 in which the upstream side in the sheet discharge direction is movable in the vertical direction with the upper middle position side of the stacking tray 200 as a base end, and the trifold sheet Pz is When stacking on the stacking tray 200 with the folded portion at the leading end, the auxiliary tray 220 is tilted upward so that the side of the folded sheet Pz that is not the folded portion is lifted so that the stacked three-fold sheet Pz is as close to horizontal as possible. Thus, the subsequent sheet can be easily discharged. When the auxiliary tray 220 is tilted upward, the stacking tray is also moved downward by a predetermined amount. In the figure, reference numeral 240 is a discharge roll provided at the sheet discharge port, reference numeral 250 is a lifting mechanism such as a plunger for moving the auxiliary tray 220 up and down, and reference numeral 260 is a height detection sensor.
[0006]
Further, in the proposed sheet stacking apparatus, when the trifolded sheet Pz and the unfolded sheet (straight sheet) Pn are mixedly loaded on the stacking tray, the ratio of the number of the trifolded sheets to the number of the unfolded sheets stacked. , The auxiliary tray 220 is tilted downward when the ratio becomes a predetermined ratio (for example, 5%) or less.
[0007]
[Patent Document 1]
JP 2001-26360 A
[0008]
[Problems to be solved by the invention]
However, the sheet stacking apparatus using the auxiliary tray has the following problems.
[0009]
First, when a plurality of three-fold sheets are stacked on the stacking tray, there is a limit to bringing the folded sheets close to a horizontal state only by raising and tilting the auxiliary tray. It is impossible to avoid the clogging phenomenon of the sheet discharge port due to the swell of the sheet, disturbing the discharge of the subsequent folded sheet, etc., and causing the occurrence of sheet jamming (jamming), making it impossible to discharge and stack properly.
[0010]
Also, in the above-mentioned Patent Document 1, it is unclear how to detect that the stacking tray is full with the three-fold sheets when the plurality of three-fold sheets are stacked. Temporarily, the fullness is detected by detecting the stacking limit position after moving up and down the stacking tray and the upper surface height of the folded sheet bundle loaded on the tray based on the detected information alone. In this case, the upper surface height of the folded sheet cannot be normally detected, and the sheet discharge port is blocked due to the rising of the folded portion of the folded sheet before the position of the stacking tray is detected. is there.
[0011]
Further, as illustrated in FIG. 31, when a large number of unfolded sheets Pn are already stacked on the stacking tray 220 and a plurality of three folded sheets Pz are stacked in succession, 3 for the unfolded sheets Pn. While the ratio of the number of folded sheets is equal to or less than a predetermined value, the auxiliary tray 220 is lowered, and the sheet discharge port is blocked by the trifold sheets Pz stacked on the unfolded sheets Pn. May end up.
[0012]
Further, in the state shown in FIG. 31, when the ratio exceeds a predetermined value, the auxiliary tray 220 rises, but when there is an unfolded sheet Pn on the auxiliary tray 220, The above-described effect of lifting the non-folded side of the folded sheet Pz on the non-folded sheet Pn cannot be expected, and the folded sheet Pz may also cause the sheet discharge port to be blocked. . Furthermore, if a large amount of unfolded sheets Pn are stacked on the auxiliary tray 220, the weight of the auxiliary tray 220 may not rise. For this purpose, a high-power lifting mechanism 250 or the like must be employed. Inevitably, the cost increases and the size of the tray increases.
[0013]
The present invention has been made in order to solve such a problem, and the main object of the present invention is to prevent the occurrence of troubles such as sheet clogging by discharging and stacking folded sheets onto a tray. An object of the present invention is to provide a sheet stacking apparatus that can perform stably and satisfactorily.
[0014]
In addition, even when the folded sheet and the unfolded sheet are mixedly loaded on the tray, the other purpose is to discharge the different sheets to the tray, regardless of the stacking condition or the situation at that time. An object of the present invention is to provide a sheet stacking apparatus capable of stably and satisfactorily performing mixed loading while preventing troubles such as sheet jamming.
[0015]
[Means for Solving the Problems]
The sheet stacking apparatus of the present invention (first) includes a tray capable of stacking folded folded sheets, a folded sheet counting unit for counting the number of folded sheets stacked on the tray, and a value of the folded sheet counting unit. Is provided with a full detection means for detecting that the tray is full when a preset limit number of sheets folded on the tray is reached.
[0016]
The stacking limit number of the folded sheets only can be set based on the sheet size. For example, the B4 plate sheet and the A3 plate sheet have different limit numbers. In addition, it may be set based on the quality and weight of the sheet. The same applies to the stacking limit number of only folded sheets in the following second and third sheet stacking apparatuses.
[0017]
The sheet stacking apparatus according to the second aspect of the present invention counts the number of folded sheets stacked on the tray that can stack the folded folded sheets and the unfolded sheets that are not folded. The folded sheet counting means and the value of the folded sheet counting means are subtracted by a specific subtracted number when the number of unfolded sheets stacked on the folded sheets stacked on the tray reaches a predetermined number. And a fullness detecting means for detecting that the tray is full when the latest value of the folded sheet counting means reaches a preset limit number of sheets to be folded only on the tray. It is a feature.
[0018]
The predetermined number of unfolded sheets is determined by the weight of the unfolded sheet when the unfolded sheet is stacked on the folded sheet, the degree of collapse of the folded portion of the folded portion of the folded sheet underneath, etc. Can be set based on. The same applies to a predetermined number of sheets in the following third sheet stacking apparatus. The subtraction number can be set based on the sheet size, quality, weight, and the like.
[0019]
Furthermore, the sheet stacking apparatus of the present invention (third) counts the number of folded sheets stacked on the tray that can stack the folded folded sheets and the unfolded sheets that are not folded. Folded sheet counting means, a limit number counting means for counting the number of sheets to be stacked only on the tray set in advance, and a value of the limit number counting means are set for the folded sheets stacked on the tray. When the number of unfolded sheets stacked on the sheet reaches a predetermined number, the specified number of sheets is added, and when the value of the folded sheet counting means reaches the latest value of the limit number counting means, A full detection means for detecting that the tray is full is provided.
[0020]
The added number of sheets can be set based on the sheet size, quality, weight, and the like.
[0021]
In the second and third sheet stacking apparatuses, the number of folded sheets stacked on the tray is counted until the predetermined number is reached on condition that the value of the folded sheet counting means is other than zero. You may comprise so that it may have a non-sheet counting means. Here, the value of the folded sheet counting means being zero means that no folded sheets are stacked on the tray. As a result, when the value is other than zero, the folded sheet is not placed on the tray. It is in a state where it is loaded and counted, or when at least one sheet is already stacked and counted.
[0022]
In the first to third sheet stacking apparatuses, a detecting unit that detects the presence or absence of a sheet on the tray is provided, and when the detection result of the detecting unit changes from the presence of a sheet to the absence of a sheet, It is good to comprise so that the value of the count in a detection means may be initialized. As a result, the value of each counting means is held while the sheets are stacked on the tray. Further, when the stacked sheets are removed from the tray, the value of each counting unit is returned to an initial value such as zero, and a new count is performed.
[0023]
In the first to third sheet stacking apparatuses (particularly, an apparatus configured to initialize a count value based on a result of the sheet presence / absence detection unit of the tray), the fullness detection unit includes one of the folded sheet and the unfolded sheet or It is preferable that at least one of the folding sheet stacking limit number, the subtraction number, and the addition number is replaced with the most unfavorable value when both are changed to different types of sheets during the stacking. As a result, appropriate fullness detection can always be performed under the condition that the folded sheet easily reaches the limit number.
[0024]
In the first to third sheet stacking apparatuses, when the tray moves up and down, the lowering detects that the tray has moved down by a certain amount (for example, the lowering movement amount corresponding to the maximum stackable number of sheets). An amount detecting unit configured to determine that the tray is full when the descending amount detecting unit detects a certain amount of lowering of the tray before a full state is detected by the full detecting unit; Good.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1
FIG. 1 shows a post-processing apparatus according to Embodiment 1 to which the sheet stacking apparatus of the present invention is applied. The post-processing apparatus 1 is arranged so as to be connected to a side wall surface side where a sheet discharge port of an image forming apparatus such as a copying machine or a printer (not shown) is provided, and an image is formed and discharged by the image forming apparatus ( The sheet (P) is used in combination to perform a desired post-processing if necessary.
[0026]
The post-processing device 1 includes a first unit 2A equipped with a curl correction device 10 and a sheet feeding device 13, a second unit 2B equipped with a folding processing device 20, a punching processing device 30, and an alignment process. The apparatus 40 and the third unit 2C equipped with the binding processing device 60 are combined. The third unit 2C has a top tray 15 for storing and holding sheets fixedly attached to the upper part of the unit housing, and a sheet stacking and storing device attached to the side wall surface portion of the housing so as to be vertically movable. And a stack tray 16 for use.
[0027]
A dotted line denoted by reference numerals R20 to R29 in FIG. 1 and the like is a sheet conveyance path for guiding and guiding the sheet P to a predetermined part (each processing apparatus or the like), and is configured using a guide member or the like. Yes. In each of the sheet transport paths R20 to R29, a plurality of sheet transport roll pairs are installed at a predetermined interval. Further, route switching gates 27, 35,... For guiding and feeding the sheet P to the conveyance route to be conveyed are provided at the branch point of the branched conveyance route.
[0028]
The curl correcting device (decurler) 10 is for correcting a sheet that has been curled upward (up curled) by fusing toner, heating and pressing at the time of fixing, or the like. The curl correction apparatus 10 is provided with a sponge in the middle of an introduction conveyance path R20 for introducing and conveying the sheet P discharged from the image forming apparatus from the sheet receiving port on the side wall surface of the first unit 2A into the post-processing apparatus 1. The roll 11 is provided in a state where it is pressed (nip) so as to bite into the roll 12 having a different thickness.
[0029]
The curl correction by the curl correction device 10 is forced in the direction opposite to the curled direction (downward) when the curled sheet P conveyed through the introduction conveyance path R20 passes through the nip between the sponge roll 11 and the roll 12. It is carried out by squeezing. Further, the curl correction device 10 is supported so that the sponge roll 11 can be advanced and retracted with respect to the roll 12 by a cam mechanism or the like. 12 to reduce the amount of biting into the sheet 12 and to simply make a roll pair that conveys the sheet), or the degree of correction can be adjusted.
[0030]
The sheet supply device 13 is for supplying different types of sheets into the post-processing device 1 when it is necessary to insert different types of sheets such as cover sheets and partition sheets into the target sheet P to be post-processed. is there. Further, when the post-processing apparatus 1 is used alone, the sheet to be subjected to post-processing by the post-processing apparatus 1 is supplied to the apparatus. The sheet supply device 13 includes a paper feed tray 14 provided on an upper portion of the casing of the first unit 11 for placing a sheet to be supplied, and a feed roll for feeding the sheets on the tray 14 one by one, The sheet feeding mechanism 15 is formed of a retard roll or the like.
[0031]
Sheets are supplied by the sheet supply device 13 when a predetermined sheet to be supplied to the paper feed tray 14 is set, and the sheets on the tray 14 are sent out one by one by the sheet delivery mechanism 15 at predetermined intervals. This is performed by being conveyed into the post-processing apparatus 1 through the conveyance path R21. The supply conveyance path R21 merges at a position downstream of the introduction conveyance path R20 that has passed through the curl correction device 10.
[0032]
The folding processing device 20 includes a first folding unit 20A installed on a first conveyance path R23 that branches and extends below a main conveyance path R22 connected to the introduction conveyance path R20 of the first unit 2A, and a first folding unit 20A. A second folding portion 20B installed in a second transport path R24 that branches from the middle of the transport path R23 and extends downward, and a main branch path R22 that branches from the middle of the second transport path R24 and extends upward. This is mainly composed of a delivery route R25 that joins the two.
[0033]
The first folding unit 20A moves forward and backward in the conveyance direction of the first conveyance path R23 to fold the sheet upstream of the first end guide 21 and the first end guide 21 that stops the sheet P at a predetermined position. For this purpose, a first fold roll pair 22 and a nip roll pair 23 capable of releasing the nip by a displacement mechanism are provided further upstream. The second folding unit 20B moves forward and backward in the transport direction of the second transport path R24 to stop the sheet P at a predetermined position, and the sheet on the upstream side of the second end guide 24. Are provided with a second folding roll pair 25 and a nip roll pair 26 on the upstream side.
[0034]
The folding processing by the folding processing device 20 is performed as follows. First, as shown in FIG. 2, the sheet P introduced into the main transport path R22 of the second unit 10B is sent to the first transport path R23 side by the path switching gate 27 (see FIG. 2). a) The dam is blocked by the first end guide 21 and the skew (skew) state is corrected by releasing the nip of the nip roll pair 23 (b in FIG. 4). Subsequently, the sheet P is swelled and bent toward the first folding roll pair 22 side by executing re-nip by the nip roll pair 23 and a slight re-conveying operation, and then the first folding roll pair 22 The first folding process is performed by pulling in between the pair of rolls 22 from the facing sheet portion and transporting it as it is to the second transport path R24 (FIGS. C and d).
[0035]
Next, after the sheet P that has been subjected to the first folding process is drawn into the second transport path R24, the folded portion is dammed by the second first end guide 24 (FIG. 2e). Subsequently, after the sheet is swollen to the second folding roll pair 25 side by a slight re-conveyance by the nip roll pair 26, the sheet is drawn between the roll pair 26 from the sheet portion facing the second folding roll pair 26. A second folding process is performed by carrying the sheet toward the delivery path R25 (f, g in the figure). The sheet P that has been subjected to the first folding process and the second folding process is conveyed through the sending path R25 with the second fold portion at the head, and is returned to the main conveying path R22 again.
[0036]
In the folding processing device 20, the folding positions of the first folding portion 10A and the second folding portion 10B are changed by the forward and backward movement of the end guides 21 and 24, so that the folding is performed inwardly as illustrated in FIG. “C-folding” and “Z-folding (one-sleeve folding)” that folds the outer side into three as illustrated in FIG. 4 can be performed. In the case of C-folding, after being discharged from the second folding roll 25, it is sent to the folder tray 29 side that can be pulled out by the route switching gate 28 on the delivery route R25, and dropped and accommodated. Symbols Pa in FIGS. 3 and 4 indicate the leading end portion of the sheet P when it is sent to the first transport path R23 during the folding process. If this folding process is not performed, the sheet P is conveyed on the main conveyance path R22 as it is without being conveyed to the first conveyance path R23 by the path switching gate 27.
[0037]
The perforation processing device 30 is arranged in the middle of the introduction transport path R26 connected to the main transport path R22 of the second unit 2B, and two, four, etc. perforation pins are provided on the sheet surface. It has a perforator 31 that perforates when it appears and a collection box 32 that collects paper scraps that are generated when perforating.
[0038]
In the punching processing by the punching processing device 30, the (one sheet) sheet P transported through the introduction transport path R26 is temporarily stopped at a predetermined position facing the punching device 31, and is in the stopped state. The punching device 31 allows the punching pin to penetrate the sheet through the sheet.
[0039]
The alignment processing device 40 is provided in the vicinity of the sheet delivery roll pair 37 that is the terminal portion of the first carry-out route R27 connected to the introduction conveyance route R26 via the route switching gate 35.
[0040]
That is, as shown in FIG. 1 and FIGS. 5 to 7 and the like, in the first carry-out path R27, in the terminal portion that extends toward the sheet discharge port 3 on the housing upper side wall surface of the third unit 2C, The sheet P is fed into a compile tray 41 that temporarily stacks and accommodates sheets P on a sheet stacking surface that is a slope that rises toward the end, and a tiltable end wall 42 that is disposed on the lower end side of the compile tray 41. A paddle 43 that rotates in contact with the sheet surface so as to align, and a tamper (alignment movable plate) that slides and aligns the sheet P stored in the compilation tray 41 on the side in the conveyance direction so as to press against the alignment reference wall 44. ) 45 etc. In FIG. 6, reference numeral 46 denotes a slide guide hole of the tamper 45, 47 denotes a displacement belt with a groove that is fixed to a part of the tamper 45 and slides the tamper, and 48 denotes a predetermined amount of the displacement belt 47 in a predetermined direction. It is a drive motor capable of rotating forward and reverse for rotation.
[0041]
A discharge roll pair 70 capable of releasing the roll nip is provided at the end of the compile tray 41 on the sheet discharge port side. The discharge roll pair 70 includes a first roll 70a fixedly provided at an end of the tray, and a second roll that abuts against the first roll 70a to form a nip and moves upward to release the nip. It is comprised with the roll 70b. When the sheets are stacked on the compilation tray 41, the nip of the discharge roll pair 70 is released.
[0042]
Further, an auxiliary tray 50 that temporarily appears and disappears from the front end of the tray is provided on the lower surface of the compilation tray 41 on the sheet discharge port 3 side. This is for temporarily supporting the sheet portion in which the leading end side in the conveyance direction of the sheets stacked on the compilation tray 41 protrudes ahead of the discharge roll pair 70, for example, when performing alignment processing. (This can also prevent the sheet portion from touching the sheets already stacked on the stack tray 16 and disturbing the stacking state).
[0043]
As shown in FIGS. 7 and 8, the auxiliary tray 50 is supported so that the base end portion side of the auxiliary tray 50 is slidable in the protruding and retracting direction by the support arm portion 51 attached to the slide groove 55 a of the support frame 55. The tip end side is slidably mounted on the rotation shaft 71 of the first roll 70a of the discharge roll. The auxiliary tray 50 is configured such that rotational power from a drive motor 52 that can rotate forward and backward is transmitted to a rack gear formed on the back surface of the auxiliary tray 50 via a power transmission mechanism 53 and a final gear 54 that meshes with the rack gear. It slides in the direction of the arrow and appears and disappears on the tip side of the compile tray 41. Reference numeral 56 in the drawing is an optical sensor for detecting the position of the auxiliary tray 50.
[0044]
In the aligning process by the aligning device 40, as shown in FIG. 10, the sheets P conveyed from the first carry-out path R27 are sent out by the sheet delivery roll pair 37 one by one onto the compilation tray 41. The sheets are stacked (a in the figure), and the sheet feeding operation by the paddle 43 and the aligning operation by the tamper 45 are performed for each sheet stacked on the tray 41 (b and c in the figure). This alignment process can be performed on a preset number of sheets P (a bundle) that can be processed.
[0045]
The binding processing device 60 is provided on the lower end side of the compile tray 41, and staples 61 for binding a bundle of sheets P stacked on the compile tray 41, and moves the stapler 51 according to the binding processing portion. And a slide moving mechanism 62.
[0046]
In the binding processing by the binding processing device 60, the stapler 51 reaches the binding position via the slide moving mechanism 62 with respect to a bundle (sheet bundle) composed of a plurality of sheets P on the compilation tray 41 on which the alignment process has been completed. This is performed by moving and stopping, and executing a binding operation (staple needle driving). At the time of this binding process, the tilting end wall 42 turns downward about the support shaft 42a and falls down so as not to obstruct the binding process operation (FIG. 5). At this time, the sheet bundle on the compilation tray 41 is held in a state of being sandwiched between the nips of the discharge roll pair 70. The binding process includes, for example, “one-point binding” for binding one of two corners of the sheet bundle (a corner on the apparatus front F side and a corner on the apparatus rear R side) and two ends of the sheet bundle. It is now possible to perform “two-point binding” at the same time. The stapler 61 normally stands by on the apparatus front side.
[0047]
In the post-processing apparatus 1, the sheet P can be directly discharged onto the stacker tray 16 without being subjected to the alignment process and the binding process.
[0048]
In this case, as shown in FIG. 11, the second roll 70b of the discharge roll pair 70 descends and comes into contact with the first roll 70a to form a nip. As a result, the sheet P sent out from the first carry-out path R27 by the sending roll pair 37 is sent out in a state where the sheet P is in contact with the stacking surface of the compile tray 42 until the leading end in the feeding direction reaches the nip of the discharging roll pair 70 (same as above). When a pair of discharge rolls 70 is reached, the sheet is held by the nip and conveyed and discharged to the stacker tray 16 (b in FIG. A).
[0049]
It is also possible to discharge a stack of sheets that have undergone only the alignment process without performing the above-described binding process to the stacker tray 16 as it is, and stack and accommodate them.
[0050]
Also in this case, as shown in FIG. 11, after the process of aligning a predetermined number of sheets P on the compilation tray 41 is completed, the second roll 70b of the discharge roll 70 is lowered to bundle the bundle of sheets P into the first roll 70a. In this state, a bundle of sheets P is discharged onto the stacker tray 16 and stacked by the conveying force of the discharge roll pair 70.
[0051]
On the other hand, when the sheet processing is performed by the binding processing device 60 after the alignment process is performed, and then a bundle of sheets is discharged onto the stacker tray 16 and stacked and accommodated, the predetermined number of sheets P on the compile tray 41 are aligned. After the processing is completed, the above-described binding processing by the stapler 61 is performed. The sheet bundle bound by the binding process is discharged as a sheet bundle from the compilation tray 41 by the conveying force of the discharge roll 70 and stacked on the stacker tray 16 as described above.
[0052]
Further, the post-processing apparatus 1 forms a second carry-out path R28 that branches upward from the introduction conveyance path R26 and extends toward the top tray 15 (FIG. 1). As a result, the sheet P introduced into the third unit 2C can be discharged to the top tray 15 and stacked and accommodated by being conveyed from the introduction conveyance path R26 to the second carry-out path R28 by the route switching gate 35. it can.
[0053]
Further, in the post-processing apparatus 1, a pull-in conveyance path R29 extending from the introduction conveyance path R26 and extending downward in the opposite direction to the second carry-out path R28 is formed.
[0054]
This pull-in conveyance path R29 is temporarily stopped by a pair of conveyance rolls 36 that can be rotated in the forward and reverse directions when the sheet P conveyed to the first carry-out path R27 reaches the branching point, and then the path is switched. With the gate 35 being displaced to a predetermined position, the conveyance roll pair 36 is rotated in the reverse direction, and the sheet P is drawn in from the rear end portion thereof, and is drawn into the conveyance path R29 in cooperation with the conveyance roll pair 39 that can be rotated forward and backward. As a result, the sheet P can be temporarily held in the pull-in conveyance path R29, and the sheet delivery time to the compile tray 41 can be adjusted.
[0055]
Further, the sheet P drawn into the drawing-in conveyance path R29 is first conveyed by the conveyance force by the conveyance roll pair 39 again after the path switching gate 35 returns the leading end 35a from the second point G2 to the first point G1. It is sent back to the route R27 side. Normally, both sheets P and Pn are moved to the first position by pulling in the sheet P and sending it out from the conveyance path R29 in accordance with the timing when the subsequent sheet Pn continuously fed from the introduction conveyance path R26 passes through the branch point of the conveyance path. Carrying in a state of overlapping in the single carry-out route R27 (two-sheet superposition) is performed. Further, in this pulling conveyance path R29, the two stacked sheets and the subsequent sheets are drawn by drawing the two stacked sheets again into the conveying path R29 and then sending them out in accordance with the conveyance timing of the subsequent sheet Pn. It is also possible to carry in a superposed state (three-sheet superposition conveyance).
[0056]
As shown in FIG. 1 and FIGS. 8 to 9, the stacker tray 16 is arranged in the vertical direction in a portion below the sheet discharge port 3 on the side wall of the housing of the third unit 2 </ b> C according to the amount of sheets to be stacked. It is attached to move up and down. When the sheets are stacked, the stutter tray 16 is first positioned so that the sheet stacking surface 16a is positioned downward from the sheet discharge port 3 by a predetermined distance. After that, when the sheets start to be stacked, the stutter car tray 16 moves downward by a predetermined amount so that the height of the top surface of the stacked sheet bundle is in a positional relationship that is a predetermined distance away from the sheet discharge port. Positioned.
[0057]
Such positioning of the stacker tray 16 is performed while detecting the height of the sheet stacking surface or the uppermost surface of the stacked sheet bundle by a predetermined optical sensor 17a, 17b or the like. Reference numeral 19 in FIG. 11 and the like denotes an end side wall surface for locking the rear end portion in the feeding direction of the sheets stacked on the tray 16, and the upper end portion thereof is installed to a position close to the front end portion of the compile tray 41. Yes.
[0058]
In the post-processing apparatus 1, as shown in FIG. 13 and the like, a plurality of sensors for detecting the conveyance status of the sheet P and the presence / absence of the sheet P in each of the sheet conveyance paths R20 to 29 and predetermined post-processing apparatuses and parts. SEN is arranged. Based on these pieces of detection information, confirmation of the conveyance state of the sheet, confirmation of occurrence of sheet jamming caused by post-processing, identification of the occurrence location, and the like are performed.
[0059]
In FIG. 13 and the like, SEN-1 and 1 are sensors that respectively detect the passage of the sheet on the entrance side and the exit side of the curl correction apparatus 10 disposed in the sheet introduction transport path R26, and SEN-3 and 4 are main transport paths R22. It is a sensor which detects each passage of the sheet | seat in the entrance side and exit side of this. Further, SEN-5 to 9 are sensors for detecting the passage of sheets in the main parts of the folding device 20 arranged in the conveyance paths R23 to 25, respectively, and SEN-10 is a punching processing apparatus 30 arranged in the introduction conveyance path R26. This is a sensor that detects the passage of the sheet on the exit side.
[0060]
SEN-11 is a sensor that detects the passage of the sheet sent from the first transport path R27 to the compile tray 41 of the alignment processing apparatus, SEN-12 is a sensor that detects the presence or absence of a sheet on the compile tray 41, and SEN-13 is It is a sensor that detects the sheet discharged from the sheet discharge port 3 by the discharge roll pair 70. SEN-14 is a sensor that detects the passage of the sheet in the pull-in conveyance path R29. SEN-20 is a sensor for detecting the presence or absence of sheets on the stack tray 16, and SEN-21 is a sensor for detecting that the stack tray 16 has reached the lowering lower limit position when the stack tray 16 is fully loaded (full).
[0061]
Among these sensors, SEN-1 to 14, 20 use actuator type sensors, and SEN-21 uses optical type sensors.
[0062]
Further, in the post-processing device 1, it is possible to arbitrarily select and execute post-processing by each of the post-processing devices. This selection of post-processing is normally performed by an input operation on the operation panel of the image forming apparatus to which the post-processing apparatus is connected or an input operation on an operation screen of a personal computer connected to the image forming apparatus. Depending on the size condition of the sheet P to be used and the combination conditions of a plurality of post-processing, there are post-processing that cannot be executed in advance.
[0063]
[Control action for specific post-processing]
In the post-processing apparatus 1, the “Z-folded sheet Pz” that has been folded (Z-folded: FIG. 4) and the “non-folded sheet Pn” that has not been folded, in particular, with respect to the stack tray 16. When the sheet is discharged under various loading conditions and mixedly loaded, troubles such as sheet clogging due to the clogging phenomenon of the sheet discharge port 3 due to the folded sheet Pz as described above can be prevented in advance, and the stacking is stable and good. Therefore, the control operation described below is performed.
[0064]
FIG. 14 is a block diagram illustrating a configuration of a full detection system for detecting a full state of the stack tray 16 when sheets are stacked.
[0065]
Reference numeral 80 in the figure is a controller that comprehensively manages and controls the operation of each component of the post-processing apparatus 1. The controller 80 basically receives a signal related to the content of the post-processing instruction described above and also receives detection signals from various sensors, whereby the arithmetic processing unit is stored in a storage means such as a ROM. After executing a program and performing necessary data processing with storage means such as a RAM, a necessary control signal is sent to each post-processing device, paper transport system, stack tray, and other controlled objects. It has become.
[0066]
The controller 80 detects fullness when sheets are stacked on the stack tray 16 in accordance with a control program stored for detecting the full state. The full detection is performed based on a full detection operation based on a detection signal from the sensor SEN-21 for detecting that the stack tray 16 has reached the lower limit of lowering at the time of maximum stacking, and a determination based on the stacked sheet number counting method described below. The full detection operation based on the result is performed in parallel, and the full detection is finally determined based on the result detected earlier.
[0067]
The stacked sheet number counting method includes a first counter unit 81 that cumulatively counts the number of sheets according to a control program, and a second counter unit 82 that stores and holds a fixed value among the count values of the first counter unit 81. A control unit 83 for controlling the counting operation of the first counter unit 81 and the second counter unit 82 and determining whether the count value of the second counter unit 82 is full by comparing with a predetermined threshold value. Configured to be deployed.
[0068]
Among these, the first counter unit 81 counts “one sheet” in response to the detection signal of the sensor SEN-11 that detects the passage of the sheet sent from the first conveyance path R27 to the compilation tray 41. If the detection signal at this time is received after receiving signals from the sensors SEN-1 to SEN-4 and SEN-10 that detect the passage of the sheet conveyed without folding processing, the counted target sheet is Fold None Sheet P n It is recognized that. Further, when receiving after receiving a signal from the sensors SEN-1 to 10 that detect the passage of the conveyed sheet after the folding process, the counted target sheet is the folded sheet P. z Recognize that
[0069]
Further, the second counter unit 82 formally determines and stores the count value from the first counter unit 81 at the stage of receiving the detection signal from the sensor SEN-13 that detects normal discharge of the sheet. ing. On the other hand, when the detection signal from the sensor SEN-13 is not received, the count value from the first counter unit 81 is not stored.
[0070]
In the control unit 83, when the detection signal from the sensor SEN-20 that detects the presence / absence of sheets on the stack tray 16 is switched from “with sheet” to “without sheet” (that is, when the sheet is removed from the tray 16). In this case, the count operation of the first counter unit 81 and the second counter unit 82 is ended and each count value is initialized (returned to zero). Further, the count value of the second count unit 83 is stored and held while the detection signal to be switched from the sensor SEN-20 is not received. If it is determined that full detection is detected, for example, a message indicating that the tray 16 is full and no further stacking is possible is displayed.
[0071]
In this number counting method, in principle, when only the folded sheets Pz are stacked on the stack tray 16 in advance, the maximum number of sheets that can be stacked is set as the “stack limit number M”, and the folded sheets Pz stacked on the tray 16 are set. It is detected whether or not the counted number of sheets reaches the stacking limit number M.
[0072]
Therefore, the number of folded sheets Pz stacked on the stack tray 16 is counted by the fold count unit 81a of the first counter unit 81, and the count value is sent to the fold count unit 82a of the second counter unit 82 and determined. In section 83, it is determined whether or not the stacking limit number M has been reached.
[0073]
Further, when stacking Z-folded sheets Pz and non-folded sheets Pn on the stack tray 16, one method is to determine the value of the fold counting unit 82 a of the second counter unit 82 in the determination unit 83. When the number of unfolded sheets Pn stacked on the folded sheets Pz stacked on the stack tray 16 reaches a predetermined number K, the specific subtraction number X is subtracted and the latest count of the folding count unit 82a is subtracted. It can be configured to determine that the value is full when the value reaches the stacking limit number M of the folded sheets Pz only (patterns A1, A2). In this case, as will be described later, a non-folding counter (counting the number of unfolded sheets Pn stacked on the tray 16 until the predetermined number K is reached on condition that the value of the fold count unit 82a is other than zero. 81b and 82b) are developed on the first counter unit 81 and the second counter unit 82 (pattern A1), and the unfolded counter is not developed (used) (pattern A2).
[0074]
Further, when the Z-folded sheet Pz and the unfolded sheet Pn are stacked and stacked on the stack tray 16, as another method, the determination unit 83 limits the value of the stacking limit number M of only the folded sheets. The number counters (81c, 82c) are developed in the first counter unit 81 and the second counter unit 82, and the value of the limit number counters (81c, 82c) is set on the folded sheets Pz stacked on the stack tray 16. When the number of unfolded sheets Pn to be stacked reaches a predetermined number, a specific addition number Y is added, and the value of the folding count unit 82a reaches the latest value of the limit number counters (81c, 82c). The tray 16 can be determined to be full (patterns B3 and B4). Even in this case, as will be described later, the number of unfolded sheets Pn stacked on the tray 16 is not counted until the predetermined number K is reached on condition that the value of the fold count unit 82a is other than zero. There are a case where the counters (81b, 82b) are developed on the first counter unit 81 and the second counter unit 82 (pattern B3), and a case where the unfolded counter is not developed (used) (pattern B4).
[0075]
The operation content of the fullness detection system based on the stacked sheet number counting method will be described below.
[0076]
<Example 1>
In Example 1, the stacking limit number M of only the folded sheets is set to “50”, and the predetermined number K of the non-folded sheets Pn is set to “20”. Then, on the stack tray 16 on which no sheets Pz and Pn are stacked, the sheet combination as shown in FIG. 15 (Pn: 10 sheets + Pz: 7 sheets + Pn: 20 sheets) is set as one set, for example, without post-processing. In the post-processing contents that are discharged and loaded directly onto the tray 16 one by one, if there is an instruction content to load 10 sets, what is the loading status of the count-type full detection system consisting of the following pattern configurations? When it became, it was investigated whether it would be detected as “full”.
[0077]
[Pattern: A1]
This full detection system is of a type using a Z-fold counter (81a, 82a) and a no-fold counter (82b, 82b) as shown in FIGS. The non-folding counter does not count the number of unfolded sheets while the value of the Z-folding counter is “0”. In this full detection system, when the no-fold counter (82b) reaches the predetermined number K of “20 sheets”, “1 sheet” as the subtraction number X is subtracted from the value of the Z-fold counter (82a). Configured. In the figure, the numerical value indicated in parentheses for the Z-fold count value is the value after the subtraction process. Then, the Z-fold count value and the Z-fold stack limit number M are compared, and when the Z-fold count value reaches the limit number M, fullness is detected. In the figure, the “Fold” column indicates “○” when the stacked sheets are folded sheets, “X” when the sheets are not folded, and the “Number of sheets” column stacks the same type of sheets. (The same applies to the columns in the other figures below).
[0078]
According to this pattern A1 full detection system, the Z-fold counter reaches the limit number M when six sheets of the 9th set of Z-fold sheets Pz are stacked, and full detection is detected (FIG. 17). That is, it was not possible to load up to the 10th set of post-processing instruction contents. Further, although only the folded sheets Pz are stacked on the bundle of unfolded sheets Pn, the full sheet is detected when the number of sheets reaches the limit number M. Occurrence of the blocking phenomenon can be prevented in advance. Furthermore, although the Z-folding stack limit number M is set to 50 sheets, the Z-folding counter value is subtracted one by one when each set is stacked (when one set has been stacked). In this case, eight sheets (58 in total) of folded sheets Pz are stacked on the tray 16 until full detection is detected.
[0079]
[Pattern: A2]
As shown in FIGS. 18 to 19, this full detection system is of a type that uses only the Z-fold counters (81 a, 82 a) without using the no-fold counter. Further, in this full detection system, every time one unfolded sheet Pn is discharged and stacked, “0.05 (= 1 ÷ 20) as the subtraction number X is subtracted from the value of the Z folding counter (82a). Configured. This subtraction number X = 0.05 is realized by artificially subtracting the value of the Z-folding counter until the predetermined number M (20 sheets) of unfolded sheets is reached. Then, the Z-fold count value and the Z-fold stack limit number M are compared, and when the Z-fold count value reaches the limit number M, fullness is detected.
[0080]
According to this pattern A2 full detection system, full detection is performed when the stacking state is the same as in pattern A1 (the stage where six sheets of the 9th set of Z-fold sheets Pz are stacked) (FIG. 19). . Also in the case of this system, as in the case of the pattern A 1, it is possible to prevent the occurrence of the sheet discharge port clogging phenomenon and to increase the number of folded sheets Pz by 8 (total 58 sheets) in the tray 16. It realizes loading. In the case of this system, unlike the pattern A1, there is an advantage that a counter without folding is unnecessary.
[0081]
[Pattern: B1]
As shown in FIGS. 20 to 21, this full detection system is of a type using a Z-fold counter (81a, 82a), a no-fold counter (82b, 82b), and a folding limit number counter (82c, 82c). . Further, in this full detection system, when the non-folding counter (82b) reaches the predetermined number K of “20 sheets”, “1 sheet” as the additional sheet number Y is added to the value of the Z folding limit sheet counter (82c). Configured to do. In the figure, the numerical value indicated in parentheses for the Z-fold limit sheet count value is the value after the addition processing. Then, the Z-fold count value is compared with the Z-fold stack limit number M (after the addition process), and fullness is detected when the Z-fold count value reaches the limit sheet count value.
[0082]
According to this pattern B1 full detection system, although the counting method is different from that in the case of pattern A1, full detection was performed when the same loading situation as in pattern A1 was reached (FIG. 21). Also in the case of this system, as in the case of the pattern A1, it is possible to prevent the occurrence of the sheet discharge port clogging phenomenon. Further, in this system, the Z-folding stack limit number M is set to 50, but the Z-folding counter value is incremented by 1 when each set is loaded (when one set is loaded). Therefore, in practice, it is possible to stack 12 sheets of folded sheets Pz (total of 62 sheets) on the tray 16 until full detection is made.
[0083]
[Pattern: B2]
As shown in FIGS. 22 to 23, this full detection system is of a type that uses only the Z-fold counter (81a, 82a) and the folding limit number counter (82c, 82c) without using the no-fold counter. . Further, in this full detection system, every time one unfolded sheet Pn is discharged and stacked, “0.05 (= 1 ÷ 20)” as the additional sheet number Y is added from the value of the Z-fold limit sheet counter (82c). Configured to do. This additional sheet number Y = 0.05 is realized by artificially adding the value of the Z-folding counter to the sheet number count until the predetermined number M (20 sheets) of unfolded sheets is reached. Then, the Z-fold count value is compared with the Z-fold stack limit number M (after the addition process), and when the Z-fold count value reaches the limit number M, fullness is detected.
[0084]
According to this pattern B2 full detection system, full detection was performed when the same loading situation as in pattern B1 was reached (FIG. 23). Also in the case of this system, as in the case of the pattern B 1, it is possible to prevent the occurrence of the sheet discharge port clogging, and to increase the number of folded sheets Pz by 12 sheets (a total of 62 sheets) to the tray 16. It realizes loading. In the case of this system, unlike the system of the pattern B1, there is a merit that a counter without folding is unnecessary.
[0085]
<Example 2>
In the second embodiment, similarly to the first embodiment, the stacking limit number M is set to “50” and the predetermined number K is set to “20”. Then, on the stack tray 16 stacked without removing one set of sheets of the first embodiment, a sheet combination as shown in FIG. 24 (Pn: 10 sheets + Pz: 2 sheets + Pn: 20 sheets + Pz: 3) There is an instruction content for stacking 20 sets, for example, post-processing contents to be ejected and stacked on the tray 16 with post-processing (in a state where bundle ejection or binding processing is performed). In this case, the fullness detection system of the counting method composed of the following pattern configurations was examined to determine when the “full” state was detected.
[0086]
[Pattern: A1]
As shown in FIG. 25, this full detection system is of the same type as the pattern A1 system of the first embodiment that uses the Z-fold counter (81a, 82a) and the no-fold counter (82b, 82b). Further, in this full detection system, similarly to the case of the pattern A1 of the first embodiment, when the no-fold counter (82b) reaches “20 sheets” of the predetermined number K, it is subtracted from the value of the Z-fold counter (82a). “One sheet” as the number of sheets X is subtracted. In the figure, the numerical value indicated in parentheses for the Z-fold count value is the value after the subtraction process. Then, the Z-fold count value and the Z-fold stack limit number M are compared, and when the Z-fold count value reaches the limit number M, fullness is detected. The “before start” column in the figure shows the data of the sheets already stacked on the tray 16 (such as the count value stored in the counter 82a) (the same applies to the columns in the other figures below). is there). Note that the folding counter value “6 sheets” before the start is a count value of folded sheets in a set of already stacked sheets (after subtracting one sheet: the final count value of the first set in FIG. 16) ).
[0087]
According to this pattern A1 full detection system, the Z-fold counter reaches the limit number M when five sheets of the eleventh set of Z-fold sheets Pz are stacked, and full detection is detected. In other words, the 12th to 20th sets of post-processing instruction contents could not be stacked. Further, although the Z-folding stack limit number M is set to 50 sheets, the Z-folding counter value is subtracted one by one when each set is stacked (when one set has been stacked). In this example, five sheets of folded sheets Pz are stacked on the tray 16 until 11 sets of sheets are stacked and full is detected (60 sheets in total: 5 sheets × 11 sets). Furthermore, the Z-fold counter has reached the limit number M of 50 sheets, but in reality, the number of folded sheets is 7 (7 sheets already stacked and 1 sheet is subtracted from the 7 sheets to 6 sheets). Since Pz has already been stacked on the tray 16, regardless of the limit number M, it is possible to stack seven folded sheets Pz on the tray 16 (all 55 sheets + 7 sheets).
[0088]
[Pattern: A2]
As shown in FIG. 26, this full detection system is of the same type as the pattern A2 system of the first embodiment that uses only the Z-fold counter (81a, 82a) without using the no-fold counter. Further, in this full detection system, as in the case of the pattern A2 of the first embodiment, every time one unfolded sheet Pn is discharged and stacked, “0. 05 (= 1 ÷ 20) ”is subtracted. This subtraction number X = 0.05 is realized by artificially subtracting the value of the Z-folding counter until the predetermined number M (20 sheets) of unfolded sheets is reached. Then, the Z-fold count value and the Z-fold stack limit number M are compared, and when the Z-fold count value reaches the limit number M, fullness is detected.
[0089]
According to this pattern A2 full detection system, full detection was performed when the same stacking condition as in pattern A1 was reached (at the time when five eleventh set of Z-fold sheets Pz were stacked). Also in the case of this system, similarly to the case of the pattern A1, it is realized that the folded sheets Pz are stacked on the tray 16 more than the stacking limit number M (50 sheets). In the case of this system, unlike the pattern A1, there is an advantage that a counter without folding is unnecessary.
[0090]
[Pattern: B1]
As shown in FIG. 27, this full detection system uses the Z-fold counter (81a, 82a), the no-fold counter (82b, 82b), and the folding limit number counter (82c, 82c). Of the same type as the previous system. Further, in this full detection system, as in the case of the pattern B1 of the first embodiment, the value of the Z folding limit sheet counter (82c) when the non-folding counter (82b) reaches "20 sheets" of the predetermined number K. Is configured to add “one” as the additional number Y. In the figure, the numerical value indicated in parentheses for the Z-fold limit sheet count value is the value after the addition processing. Then, the Z-fold count value is compared with the Z-fold stack limit number M (after the addition process), and fullness is detected when the Z-fold count value reaches the limit sheet count value. Note that the fold counter value “7 sheets” and the Z fold limit sheet count value “51 sheets” before the start in the drawing are the fold sheet count value and the limit sheet count value (in a set of already stacked sheets) ( After one sheet is added: one set of final count values in FIG. 20).
[0091]
According to this pattern B1 full detection system, the counting method is different from that in the case of pattern A1, but full detection was performed when the same loading situation as in pattern A1 was reached. Also in the case of this system, similarly to the case of the pattern A1, it is realized that the folded sheets Pz are stacked on the tray 16 more than the stacking limit number M (50 sheets).
[0092]
[Pattern: B2]
As shown in FIG. 28, the full detection system does not use the no-fold counter, but uses only the Z-fold counter (81a, 82a) and the folding limit number counter (82c, 82c). Of the same type as the previous system. Further, in this full detection system, every time one unfolded sheet Pn is discharged and stacked, “0.05 (= 1 ÷ 20)” as the additional sheet number Y is subtracted from the value of the Z folding limit sheet counter (82c). Configured to do. This subtracted sheet number Y = 0.05 is realized by artificially adding the value of the Z-fold counter to the sheet number count until the predetermined number M (20 sheets) of unfolded sheets is reached. Then, the Z-fold count value is compared with the Z-fold stack limit number M (after the addition process), and when the Z-fold count value reaches the limit number M, fullness is detected.
[0093]
According to this pattern B2 full detection system, full detection was performed when the loading situation was the same as in pattern B1. Also in the case of this system, similarly to the case of the pattern B1, it is possible to stack the folded sheets Pz on the tray 16 more than the stacking limit number M (50 sheets). In the case of this system, unlike the pattern B1 system, there is an advantage that a counter without folding is unnecessary.
[0094]
<< Other Embodiments >>
In the first embodiment, the case where the sheet stacking apparatus of the present invention is applied to the post-processing apparatus 1 and then the processing apparatus is further connected to the image forming apparatus is used. However, the processing apparatus 1 is used alone after that. It is also possible to do.
[0095]
In this case, the post-processing apparatus 1 is also provided with operation means (operation panel) for inputting post-processing conditions, operation instructions, etc., and displaying the apparatus status, etc., and performing post-processing condition input operations from the operation panel What should I do? Then, the sheet to be post-processed may be set on the tray 14 of the sheet supply device 13 and the post-processing may be started. Further, when the processing apparatus 1 is used singly, when full folding sheets are stacked on the stack tray 16 or mixed stacking of folded sheets and unfolded sheets is performed, the fullness detection system as described above functions similarly. Thus, it is possible to perform good sheet stacking while preventing the standing and closing phenomenon caused by the folded sheet at the sheet discharge port 3. It should be noted that the sheet stacking apparatus of the present invention can also be configured so as to be incorporated from the beginning in the image forming apparatus and combined and used.
[0096]
【The invention's effect】
As described above, according to the sheet processing apparatus of the present invention, the full sheet is detected when the value of the folded sheet counting means reaches the preset limit of the number of folded sheets on the tray. Thus, it is possible to stably and satisfactorily perform the stacking of the folded sheets on the tray while preventing the occurrence of troubles such as sheet clogging.
[0097]
Further, the value of the folded sheet counting means is subtracted by a specific subtraction number when the number of unfolded sheets stacked on the folded sheets stacked on the tray reaches a predetermined number, and the folded sheet counting means When the latest value reaches the above-mentioned limit number of sheets (or the value of the limit number counting means reaches the predetermined number of unfolded sheets stacked on the folded sheets stacked on the tray In addition to adding a specific additional number of sheets, when the value of the folded sheet counting means reaches the latest value of the limit number counting means), the full sheet is detected. Even in the case of mixed loading on a tray, regardless of the stacking conditions and conditions at that time, it is possible to prevent the occurrence of troubles such as sheet clogging by preventing mixed loading of different sheets into the tray. One stable can be satisfactorily performed.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a post-processing apparatus according to an embodiment to which a sheet stacking apparatus of the present invention is applied.
FIG. 2 is an explanatory view showing a folding process.
FIG. 3 is an explanatory diagram showing a folding process of C-folding.
FIG. 4 is an explanatory view showing a Z-folding process.
FIG. 5 is a schematic configuration diagram illustrating a configuration content of a punching processing device, an alignment processing device, a binding processing device, and their surroundings.
FIG. 6 is a perspective view showing an alignment processing apparatus.
FIG. 7 is a perspective view mainly showing an auxiliary tray of the alignment processing device.
FIG. 8 is an explanatory diagram mainly showing an initial state of a stutter car tray and an auxiliary tray.
FIG. 9 is an explanatory diagram illustrating an example of a state when sheets are stacked on a stutter car tray and an auxiliary tray.
FIG. 10 is an explanatory diagram showing a state of alignment processing.
FIG. 11 is an explanatory diagram showing a state of direct discharge to a stutter car tray.
FIG. 12 is an explanatory diagram showing a state of discharging a sheet bundle to a stutter car tray.
FIG. 13 is a main part explanatory view showing an arrangement state of each sensor.
FIG. 14 is an explanatory diagram showing a configuration of a full detection system.
15 is an explanatory diagram illustrating a set configuration and a stacking state of sheets stacked on the stack tray in Embodiment 1. FIG.
FIG. 16 is a chart showing the main operation process (initial stage) of the pattern A1 full detection system in the first embodiment;
FIG. 17 is a chart showing a main operation process (final stage) of the pattern A1 full detection system according to the first embodiment.
FIG. 18 is a chart showing a main operation process (initial stage) of the pattern A2 full detection system according to the first embodiment.
FIG. 19 is a chart showing main operation processes (final stage) of the pattern A2 full detection system according to the first embodiment;
FIG. 20
FIG. 21 is a chart showing a main operation process (final stage) of the pattern B1 full detection system according to the first embodiment.
22 is a chart showing main operation processes (initial stage) of the pattern B2 full detection system in Embodiment 1. FIG.
FIG. 23 is a chart showing main operation processes (final stage) of the pattern B2 full detection system according to the first embodiment.
FIG. 24 is an explanatory diagram illustrating a set configuration and a stacking state of sheets stacked on the stack tray in the second embodiment.
FIG. 25 is a chart showing main operation processes (initial stage and final stage) of the pattern A1 full detection system according to the second embodiment.
FIG. 26 is a chart showing main operation processes (initial stage and final stage) of the pattern A2 full detection system according to the second embodiment.
FIG. 27 is a chart showing main operation processes (initial stage and final stage) of the full detection system for pattern B1 in Embodiment 2;
28 is a chart showing main operation processes (initial stage and final stage) of the pattern B2 full detection system in Embodiment 2. FIG.
FIG. 29 is a conceptual diagram illustrating a closing phenomenon that occurs when folded sheets are stacked.
FIG. 30 is an explanatory diagram illustrating a main configuration of a conventional sheet stacking apparatus.
31 is an explanatory view showing an example of a certain loading state in the apparatus of FIG. 30. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Post-processing apparatus (sheet stacking apparatus), 16 ... Stack tray (tray), 20 ... Fold processing apparatus, 80 ... Controller (a full detection means is included), 81a, 82a ... Folded sheet counter (folded sheet counting means), 81b, 82b: Folded sheet counter (non-folded sheet counting means), 81c, 82c: Folded sheet limit sheet counter (limit sheet counting means), Pz: Folded sheet, Pn: Unfolded sheet, SEN-20: Presence / absence of stacked sheets Detection sensor (detection means).

Claims (6)

And folding treated folded sheet without folding not sheet and folding the tray capable of stacking a mix of,
A folded sheet counting means for counting the number of folded sheets stacked on the tray;
The value of this folded sheet counting means, together with the folding without sheets loaded on the folded sheets are stacked on the tray is subtracted specific subtracted number at the stage reaches a predetermined number, the folded sheet counting means A sheet stacking apparatus comprising: a full detection unit that detects that the tray is full when the latest value of the tray reaches a preset number of sheets to be stacked only on the tray. . 2. The non-fold sheet counting unit that counts the number of unfolded sheets stacked on the tray until the predetermined number of sheets is reached on condition that the value of the folded sheet counting unit is other than zero. of the sheet stacking apparatus. A tray that can stack a folded sheet that is folded and a non-folded sheet that is not folded;
A folded sheet counting means for counting the number of folded sheets stacked on the tray;
A limit number counting means for counting the value of the load limit number of only folded sheets to the tray set Me pre,
The value of the limit number counting means is added by a specific added number when the number of unfolded sheets stacked on the folded sheets stacked on the tray reaches a predetermined number, and the folded sheet counting means A full detection means for detecting that the tray is full when the value of the tray reaches the latest value of the limit number counting means;
A sheet stacking apparatus comprising: The number of folding without sheets loaded on the tray, on condition that the value of said folded sheet counting means is non-zero, according to claim 3 having a sheet counting means without folding counted until a predetermined number of sheets Sheet stacking device. Detection means for detecting the presence / absence of sheets on the tray is provided, and when the detection result of the detection means changes from presence of sheets to absence of sheets, count values in the folded sheet counting means and the fullness detection means are initialized. Item 4. The sheet stacking apparatus according to Item 1 or 3 . The tray moves up and down, and includes a descent amount detecting means for detecting that the tray has fallen by a certain amount, and the descent amount detecting means detects the full state before the fullness detecting means detects the full state. 6. The sheet stacking apparatus according to claim 1, wherein the sheet stacking device is configured to detect that the tray is full when a certain amount of descent is detected .

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