CN101289148B - Postprocessing device for paper, and postprocessing paper buffer method - Google Patents

Abstract

The invention provides a paper post-processing device. In a paper post-processing device that sorts paper after image formation, or performs stapling processing, etc., when the post-processing leading on the processing tray has not been completed, regarding feeding into the standby tray for temporarily waiting for newly fed paper The three sheets of paper are staggered and stacked in such a way that the front ends of the second and third sheets are more upstream in the conveying direction than the front ends of the first sheet, so that the longitudinal positioning on the subsequent processing tray can be reliably performed.

Description

Paper post-processing device and buffer method for post-processing paper

technical field

The invention relates to a paper post-processing device, in particular to a paper post-processing device with a paper buffering function. the

Background technique

In recent years, in an image forming apparatus, a paper post-processing device is installed adjacent to a paper discharge unit of the main body of the image forming apparatus in order to perform paper post-processing such as sorting and stapling of image-formed paper. the

The paper post-processing device includes a plurality of units for transporting and discharging paper from the image forming apparatus to a discharge tray, and is roughly divided into two types: a path that does not perform post-processing and a path that performs post-processing. When not post-processing, paper is conveyed on the non-post-processing transport path, and is directly ejected to the output tray. When performing post-processing, it is transported to the processing tray through the branched conveying path, and stacked, stacking a specified number of sheets of paper, after adjustment on the processing tray, post-processing is performed. the

In the prior art, there is a paper post-processing device as follows. The paper post-processing device includes: an overlapping unit, and a first transport path and a second transport path are provided on the post-processing transport path upstream of the post-processing unit. The second conveying path makes the paper pass through the first conveying path and the second conveying path, and temporarily stops it to overlap multiple sheets of paper, and the overlapping unit makes the paper on the upper side after overlapping slightly ahead of the paper on the lower side (eg, Japanese Patent Application Laid-Open No. 11-157741). the

In addition, in US7,172,187, there is disclosed a paper post-processing device (A sheet post-process apparatus) as follows: when post-processing is required, multiple sheets of paper are placed on standby in the standby tray, and they are dropped by their own weight. After stacking and adjusting the specified number of sheets in the processing tray provided below, the stapling process is performed. the

Contents of the invention

In order to solve the above problems, an object of the present invention is to provide a paper post-processing device with a paper buffer function. the

According to an aspect of the present invention, the paper post-processing device includes: a paper carrying unit that receives the paper conveyed from the image forming apparatus and temporarily puts it on standby; It can be raised and lowered; the driving source is used to convey the paper, wherein the control of the paper conveying action based on the driving source and the rotating body deviates from the front end of the first sheet of paper carried in the paper carrying part on the upstream side of the conveying direction by a predetermined distance and the first page The front end of the paper is at the leading position in the paper conveying direction, and the front end of the second page of paper is supported, so that the front end of the paper after the third page is aligned with the front end of the second page of paper. the

According to another aspect of the present invention, the paper post-processing device includes: a standby tray for receiving the paper conveyed from the image forming apparatus and temporarily putting it on standby; It can be raised and lowered; the driving source is used to convey the paper, wherein, the paper conveying action based on the driving source and the rotating body is controlled, and the front end of the first sheet of paper carried in the paper carrying part is deviated from the predetermined distance on the upstream side of the conveying direction. The leading edge of the second sheet of paper controls whether or not to make subsequent sheets stand by in the standby tray, depending on whether the first and second sheets of paper are supplied from the image forming apparatus within a predetermined time interval. the

Description of drawings

Fig. 1 is a perspective view of an image forming device and a paper post-processing device juxtaposed therewith;

Fig. 2 is a block diagram showing a configuration example of a part of the control system provided in the paper post-processing device;

3 is a schematic diagram of a paper post-processing device related to an embodiment of the present invention;

Figure 4 is a perspective view showing the vicinity of the entrance roller of the paper post-processing device;

Figure 5 is a perspective view showing the vicinity of the blades of the paper post-processing device;

Figure 6 is an explanatory diagram for explaining the buffering action of paper;

Figure 7 is an explanatory diagram for explaining the buffering action of paper;

Figure 8 is an explanatory diagram for explaining the buffering action of paper;

Figure 9 is an explanatory diagram for explaining the buffering action of paper;

Figure 10 is an explanatory diagram for explaining the buffering action of paper;

Figure 11 is an explanatory diagram for explaining the buffering action of paper;

Figure 12 is an explanatory diagram for explaining the buffering action of paper;

Figure 13 is an explanatory diagram for explaining the buffering action of paper;

Figure 14 is an explanatory diagram for explaining the buffering action of paper;

Fig. 15 is a schematic diagram of a paper post-processing device related to another embodiment of the present invention;

Fig. 16 is an explanatory diagram for explaining the situation when the first sheet of paper is newly conveyed in the paper carrying section;

17A to 17L are explanatory diagrams for schematically explaining the situation in which three sheets of paper are stacked in the paper carrying portion;

18A to 18C are explanatory diagrams for schematically explaining the situation where the paper stacked in the paper carrying platform falls into the processing tray;

Fig. 19 is a diagram showing the vicinity of the de-static brush of the paper post-processing device;

Figure 20 is a perspective view showing the vicinity of the auxiliary arm motor;

Figure 21 is an explanatory diagram for explaining the action of the blade;

Figure 22 is an explanatory diagram for explaining the action of the blade;

Figure 23 is an explanatory diagram for explaining the action of the blade;

Figure 24 is a perspective view showing that the reel has been buckled;

Fig. 25 is a diagram showing the relationship among the parallel pins, the rotating shaft, the groove of the reel, etc.;

FIG. 26 is an explanatory diagram for explaining a method of applying force applied to parallel pins;

Figure 27 is a perspective view showing the vicinity of the standby disk;

Fig. 28 is a perspective view for explaining the operation when sorting the standby disk;

FIG. 29 is a diagram for explaining simplified classification based on standby disks. the

Detailed ways

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

The paper post-processing device 100 is provided adjacent to the paper discharge unit of the image forming apparatus 200 (see FIG. 1 ). Image forming apparatus 200 is, for example, a digital copier. As shown in FIG. 1 , the image forming apparatus 200 includes: a scanning unit 220 including an automatic document feeder (ADF: Automatic Document Feeder) 210; The image corresponding to the provided image data. the

The automatic document feeder (ADF) 210 is used to feed the document page by page to a prescribed reading position. The scanning unit 220 is used to optically read the image of the document and convert it into image data. The image reading device includes an ADF 210 and a scanning unit 220. the

The printer engine unit 230 forms an electrostatic latent image on an image carrier such as a photosensitive drum, develops the electrostatic latent image with toner, transfers the developed toner image to paper as an image forming medium, and fixes it on the paper. The transferred toner image. With such a configuration, in the image forming apparatus 200 , the image read by the scanner unit 220 can be copied onto paper as an image forming medium by the printer engine unit 230 . The paper on which the image is formed by the image forming apparatus 200 is conveyed into the paper post-processing apparatus 100 , and binding processing, sorting processing, etc. are performed according to the content of the post-processing selected on the control panel of the image forming apparatus 200 , for example. the

FIG. 2 is a block diagram showing a configuration example of a part of a control system provided in the sheet post-processing apparatus. The sheet post-processing device 100 is connected to the image forming device 200 through the control unit 110 . The control unit 110 controls a paper detection sensor S26 , a rolling roller opening and closing magnet MG, an electromagnetic solenoid (electromagnet) ES, a pulse motor PM, etc., which will be described later. the

3 is a schematic cross-sectional view showing a schematic configuration of a sheet post-processing device. Fig. 4 is a perspective view showing the vicinity of an entrance roller of the sheet post-processing device. In addition, FIG. 5 is a perspective view showing the vicinity of blades of the sheet post-processing device. the

As shown in FIG. 3 , the paper post-processing device 100 basically includes a standby tray 3 , a processing tray 4 , a stapler 9 , and a stacking tray 13 . the

A pair of inlet rollers 1 receives paper P on which an image has been formed in an image forming apparatus such as a copier, and supplies it to a pair of outlet rollers 2, from which the paper P is conveyed to a standby tray 3 . A transport path for guiding the paper P to the exit roller 2 is formed from the entrance roller 1 to the standby tray 3 . The conveying path includes: conveying path 26, which conveys paper according to the post-processing content selected by the user; and conveying path 101, which is a conveying path when no post-processing is performed. the

The standby tray 3 is used to buffer the conveyed paper, that is, to temporarily hold the paper. The standby tray 3 includes a pair of support members that support a part of the paper from both sides in the paper width direction, and the standby tray 3 Can be opened and closed. The predetermined number of sheets stacked on the standby tray 3 are dropped to the processing tray 4 by moving the support member in the sheet width direction. When the paper falls, the blade 5 is rotated. the

The blade (paddle) 5 is made of elastic body, and pushes the paper from the standby tray 3 to the processing tray 4, and makes it consistent with the paper conveying direction. the

The processing tray 4 adjusts and supports the stacked sheets of paper P while the stapler 9 is a processing mechanism for post-processing the sheets of paper P. the

During adjustment in the longitudinal direction (transportation direction), the elastic blade 5 is rotated to align the upper surface of the paper on the processing tray 4 with the paper rear end positioning portion 4a provided in the upstream direction. And, the longitudinal adjustment roller 7 on the processing tray 4 is rotated in the direction opposite to the discharge direction to adjust the lower surface of the paper on the paper rear end positioning portion 4a. The paper stop position of the paper rear end positioning portion 4a is set to coincide with the vertical wall of the inkjet nozzle 10, or to move approximately several mm in the discharge direction. the

In addition, as shown in FIGS. 3 to 5 , the processing tray 4 includes: a lateral adjustment plate 6 for adjusting the lateral direction (orthogonal to the paper conveying direction) of the paper; a longitudinal adjustment roller 7; a paper guide 8; a binding device 9; inkjet 10; binding claw belt 11; discharge roller 12, which rotates positively to discharge the conveyed paper, and can be rotated in conjunction with the longitudinal adjustment roller 7; stacking disc 13. The stacker tray 13 is configured to be movable up and down, and stacks discharged sheets after post-processing or sorting processing. the

The standby tray 3 can drop the paper P to the processing tray 4 , and on the other hand, can also convey the paper P in the direction of the stacking tray 13 . the

As shown in FIG. 3 , the standby tray 3 is arranged obliquely so as to support the paper P in a state where the front end of the paper P is higher than the rear end. In addition, as shown in FIG. 3 , the stacker tray 13 is disposed at an inclination so as to support the paper P in a state where the front end of the paper P is higher than the rear end. the

In the paper post-processing apparatus 100 configured in this way, a plurality of units for transporting and discharging the paper transported in the paper post-processing apparatus to the stacking tray 13 are prepared, which can be roughly divided into paths for performing post-processing and paths for not performing post-processing. There are two paths. the

(post-processing situation)

First, the case of post-processing paper will be described. As the post-processing, there are, for example, a binding process for binding bundled paper sheets by a stapler, and a sorting process for aligning the paper sheets. the

The paper for post-processing conveyed from the image forming apparatus is firstly conveyed to the standby tray 3 in the paper post-processing device. In such conveyance, the entrance roller motor (not shown) is rotated in the forward direction, and the drive is transmitted to the entrance roller 1 and the exit roller 2. The sheets passing through the exit roller 2 are temporarily stacked on the standby tray 3 , then dropped and supplied to the processing tray 4 . the

When paper is newly conveyed for the next post-processing, if the processing tray 4 is in the process of post-processing or the paper after conveying post-processing is being discharged, the paper P is put on standby in the standby tray 3 which can be held temporarily. . the

In order to improve a series of performances of image formation and post-processing, it is preferable to buffer multiple sheets of paper on the standby tray 3 to ensure time for post-processing. However, when just stacking papers with respective qualities and making them stand by, it is difficult to transmit the power for adjusting the transport direction to the paper in the middle position of the stacked multiple sheets, so the papers on standby are sent to the processing unit. At disc 4, adjustments can be chaotic. In addition, stacking on the processing tray 4 that can cover the entire width of the paper enables stable consistency of stacking, compared to waiting for the paper on the standby tray 3 for a long time. the

In the sheet post-processing apparatus 100 according to the present embodiment, when a plurality of sheets P of two or more than three pages on standby falls to the processing tray 4, the realized stacking in the standby tray can obtain Good longitudinal consistency. the

Next, a method of stacking three sheets of paper on the standby tray 3 will be described. the

(stacking of the first sheet of paper towards the standby tray)

Next, description will be made with reference to FIGS. 6 and 7 . FIG. 6 is for explaining the case where the first sheet of paper is transported to be stacked on the standby tray 3 . FIG. 7 is used to illustrate the situation that the first sheet of paper is stacked on the standby tray 3 . the

First, when the front end of the first sheet of paper is transported to the vicinity of the rotating roller 14, the rotating roller opening and closing magnet MG is activated to raise the rotating roller 14 by 4-5mm (not limited to this range) to the raised position. In this state, the rotating motor (not shown) is rotated forward, and the rotating roller 14 is rotated along the conveying direction. This is to prevent the front end of the first conveyed sheet from hitting the turning roller 14 (see FIG. 6 ). the

Since the standby tray 3 is inclined so that the upstream side is low and the downstream side is high in the transport direction, the first sheet discharged from the exit roller 2 is stacked on the standby tray 3 and P3 of the blade 5 by its own weight. After stacking, the electromagnetic solenoid (electromagnetic solenoid) ES is activated to rotate the clamping handle 3a in the direction of arrow Q to hold the rear end of the paper. One end of the clamp handle 3a is equipped with a ring 3c connected to the electromagnetic solenoid ES, and the other end side is bonded with a holding member (gripping member) 3b (for example, a urethane rubber sheet) which includes a surface with a high friction coefficient and has elasticity. . By the operation of the electromagnetic solenoid ES, the ring 3c is pulled in the direction of the arrow R and rotated to a position where the holding portion 3b presses the upper surface of the paper (see FIG. 6 ). the

After the first sheet of paper is completely stacked on the standby tray 3 (refer to FIG. 7 ), the rotating roller 14 is lowered from the raised position along the arrow D direction, and the paper is pressed on the standby tray 3 . Thus, the front and rear ends of the paper can be pressed together. This is to keep the first sheet of paper on the standby tray 3 stably. the

(stacking of the second sheet of paper towards the standby tray)

Next, stacking of the second sheet of paper toward the standby tray 3 will be described. Fig. 8 is for explaining the state of transporting the second sheet of paper to the standby tray. FIG. 9 is a case where the first sheet and the second sheet are stacked on the standby tray 3 with their front ends staggered. FIG. 10 is for explaining the case where the second sheet of paper is stacked on the standby tray 3 . the

When the front end of the second sheet of paper is conveyed to the vicinity of the rotating roller 14, the rotating roller opening and closing magnet MG is activated to lift the rotating roller 14 holding the first sheet of paper on the standby tray 3 to the raised position. And, in this state, the rotary motor is rotated forward to rotate in the conveying direction (see FIG. 8 ). This is to assume that when the second sheet of paper hits the rotating roller 14, the impact load can also be weakened, so that paper jam does not occur. the

At this time, the rear end of the first sheet of paper stacked on the standby tray 3 is pinched by the clamp handle 3a, and although the turning roller 14 rotates in the conveying direction, since it is located at the raised position, it will not Feeds the first sheet of paper. the

Afterwards, before the second sheet of paper falls and is stacked to the standby tray 3, the rear end of the first sheet of paper that is picked (clamped) on the upper surface of P3 of the pinch handle 3a and the blade 5 is released, and At the timing when the front end of the second sheet of paper arrives at a position shifted by a predetermined position from the front end of the first sheet of paper on the upstream side, the turning roller 14 at the ascending position is kept rotating in the conveying direction, and after a predetermined time elapses, it is rotated in the direction of the arrow D decline. the

Through this operation, two sheets of paper are conveyed with the leading edge of the first sheet and the second sheet being offset (in the conveying direction, the leading edge of the first sheet is ahead of the leading edge of the second sheet). Here, the offset between the first page and the second page is set to 5-20 mm (greater than or equal to 5 mm and less than or equal to 20 mm). For example, in consideration of fluctuations in slipping and falling, it is preferable that the amount of deviation is 10 mm. That is, the pulse of the pulse motor PM that conveys the second sheet of paper is calculated, and at the timing when the difference between the leading ends of the two sheets becomes 10 mm, the rotating turning roller 14 is lowered and bitten. In this way, until the rear end of the second page is discharged from the exit roller pair 2, the first page and the second page are simultaneously conveyed downstream by the turning roller 14, and after the discharge is completed, the rotation of the turning roller 14 is stopped. (Refer to Figure 9). The second sheet of paper falls onto the standby tray 3 and P3 of the blade 5 by its own weight while keeping the position of the front end of the paper staggered. the

Then, after being stacked on P3 of the blade 5, the rear end of the second sheet is held by the pinch handle 3a like the first sheet (see FIG. 10). the

As a result, the paper leading end and the paper trailing end with shifted positions are held, and the stacking of the two paper sheets on the standby tray 3 is completed. the

(Stacking of the third sheet of paper towards the standby tray)

Next, stacking of the third sheet of paper toward the standby tray will be described. FIG. 11 is for explaining the case where the third sheet of paper is transported to be stacked on the standby tray 3 . FIG. 12 is for explaining the case where the second sheet and the third sheet are conveyed and stacked with a predetermined amount shifted from the front end of the first sheet. FIG. 13 is used to illustrate the stacking of the third page of paper on the standby tray 3 . the

When the front end of the third page of paper is conveyed to the vicinity of the turning roller 14, the turning roller opening and closing magnet MG is activated to lift the turning roller 14, which presses the first and second pages of paper on the standby tray 3, to the raised position. Then, in this state, the rotation motor is rotated forward, and the rotation roller 14 is rotated in the conveyance direction (see FIG. 11 ). the

At this time, the rear ends of the first and second sheets of paper stacked on the standby tray 3 are pinched by the clamping handle 3a, and although the rotating roller 14 rotates along the conveying direction, because it is located in the raised position, it cannot The first and second pages are fed. the

Before the rear end of the third sheet of paper falls and is stacked in the standby tray 3, that is, by calculating the pulse of the pulse motor PM driving the exit roller pair 2, the front end of the second sheet of paper and the front end of the third sheet of paper are approximately At the time of overlapping, the pulse motor PM is stopped. In addition, while releasing the grip handle 3a, the turning roller 14 at the raised position is lowered in the arrow D direction while rotating in the conveying direction (see FIG. 12 ). At this time, since the turning roller 14 rotates in the conveying direction, although the sheet is conveyed downstream, the rotation of the turning roller 14 is stopped after a few pulses have elapsed. the

Through this operation, without changing the offset positional relationship between the first page and the second page, the third page is overlapped on the second page so as to be aligned with the leading edge of the second page. the

The stacking offset of the three sheets of paper on the standby tray 3 is as follows: the first sheet is located at the most advanced position on the downstream side in the conveying direction, and the second and third pages are located approximately 10 mm upstream from this position. . With this positional relationship, each sheet is pressed against the standby tray 3 by the rotating roller 14 (refer to FIG. 13 ). At this time, when there is no paper to be conveyed next, or when there is no need to stand by, there is no need to (pinch) the rear ends of the second and third pages by the clamping handle 13 . the

As described above, when the number of sheets to be stapled reaches three, after being buffered by the standby tray 3, the pair of supporting members constituting the standby tray 3 are opened and moved in the paper width direction, and the sheets are dropped and supplied to the processing tray 4. superior. Therefore, since the sheets dropped and supplied onto the processing tray 4 land on the processing tray 4 from the rear end of the sheets, the longitudinal uniformity on the processing tray 4 is good. the

In addition, when there is a subsequent fourth page of paper to be on standby, it is transported and stacked in the same process as the third page, and is buffered into the standby tray 3 while being pressed by the rotating roller 14 and the clamping handle 3a. Can. the

(handling of unbuffered paper after the fourth page)

When the number of paper sheets buffered in the standby tray 3 is three and the number of paper sheets to be post-processed is more than four, first, the three sheets of paper buffered in the standby tray 3 are dropped to the processing tray 4 . Then, after the subsequent sheets are temporarily ejected and stacked on the standby tray 3, the sheets are dropped one by one on the processing tray 4 (see FIG. 14). The same process is performed for the paper sheets of the fifth or sixth page. After the sheets are temporarily ejected and stacked on the standby tray 3 , the sheets are always dropped from the rear end side of the sheets onto the processing tray 4 , so that the longitudinal uniformity of the dropped sheets on the processing tray 4 is good. the

In addition, with regard to the paper sheets from the fourth page onwards, it is needless to say that the following control can also be performed: the standby tray 3 is maintained in an open state, and the paper is not temporarily ejected and stacked in the standby tray 3, so that it is directly dropped and supplied to the processing tray 4 . the

When the stacked sheets P on the processing tray 4 reach a predetermined number of sheets, the stapler 9 forms a stapled sheet bundle T after adjustment in the vertical direction and the horizontal direction. After that, the paper bundle T is driven by the longitudinal adjustment roller 7, the inkjet 10, and the claw belt 11 to transport the paper bundle T along the direction of the stacking disc 13. 11a is caught and discharged onto the stacking tray 13, and the binding process of the sheets P is completed. the

Also, when the number of paper sheets on standby is four or more and the number of paper sheets to be post-processed is five or more, it is only necessary to carry out the same standby conveyance as the above-mentioned third page for the fourth paper sheet. the

According to this embodiment, when three-page buffering is performed, the second page and the third page are staggered and stacked on the standby tray 3 on the rear end side of the first page, that is, on the upstream side of the transport direction. During the longitudinal adjustment process on the subsequent processing tray 4, the adjustment of the second sheet sandwiched between the first sheet and the third sheet can be reliably performed. That is, when the sheets stacked on the standby tray 3 are dropped and fed, the uppermost (third page) sheet is aligned with the sheet rear end positioning portion 4 a by the operation of the blade 5 described later. On the other hand, the bottommost (first page) paper stacked on the processing tray 4 is conveyed in the direction opposite to the discharge direction by the reverse rotation of the lengthwise adjustment roller 7 and the discharge roller 12, and is brought into line with the rear of the paper. The end positioning part 4a is consistent. As described above, when adjusting and conveying the bottommost sheet stacked with an offset of approximately 10 mm in the sheet conveying direction, regarding the sheet stacked in the middle (second page), even if the stacking on the standby tray deviates in the upstream direction , especially due to the frictional resistance between the first sheet and the sheet, this second sheet will also be conveyed along with the first sheet, thereby improving consistency. the

In the above-mentioned embodiment, the stacking method of the three-page buffer has been described in detail, however, the sheet processing speed (ejection speed) of the image forming apparatus and the post-processing speed of the sheet post-processing apparatus vary due to various conditions, and Not fixed. That is, due to differences in printing modes such as single-sided/double-sided printing and high-definition mode, and differences in the material and size of printing media, the intervals for supplying paper to the paper post-processing device are also different. Moreover, the paper post-processing device will also be difficult to make the post-processing time always fixed due to the difference in the binding positions such as binding at the two positions of the corner and the end of the paper, the material of the medium, the thickness of the material, and the number of sheets of paper to be processed. . the

Therefore, in order to improve the processing performance and consistency of the paper post-processing device, it is more effective to increase or decrease the number of buffered pages. the

For example, after the first and second sheets are fed from the image forming apparatus at a low speed, and the third sheet is not fed even after a predetermined time elapses after the second sheet has passed, if the processing on the processing tray 4 has ended, Then, the two sheets of paper P being buffered in the standby tray 3 fall into the processing tray 4 , and the third page of paper P is transported to the processing tray 4 via the standby tray 3 alone. Thus, the consistency on the processing disk 4 is improved, and the performance will not be degraded. On the other hand, even if the first and second sheets are fed at a low speed, if the interval between sheets is within the specified time, even the third sheet is buffered in the standby tray 3, and since post-processing time is ensured, there will be no result in reduced performance. the

Therefore, the sheet post-processing apparatus according to this embodiment includes a control unit capable of switching the number of buffered sheets in the standby tray 3 according to the standard printing speed of the image forming apparatus 200 and the processing speed of the sheet post-processing apparatus 100 . That is, the paper P for post-processing is conveyed by the entrance roller 1 rotating synchronously with the paper supply speed from the image forming apparatus 200, and the paper interval time detected by the paper detection sensor 26 provided on the conveyance path 26 exceeds During the specified time, based on the processing speed of the post-processing on the processing tray 4, the number of buffered pages waiting in the standby tray 3 is reduced to no more than 3 pages (for example, two pages), so as to ensure post-processing time. Also, if the paper is supplied from the image forming apparatus 200 within a predetermined time and the post-processing on the processing tray 4 is not completed, control is performed so that the number of buffered sheets is increased to three or more. As for the paper interval time of multiple sheets of paper P passing through the transport path 26, the paper detection sensor S26 only needs to measure the time from the detection of the trailing end of the leading paper (for example, the first page) to the detection of the next paper P. The elapsed time until the front end is sufficient. In this way, the number of buffered sheets to the standby tray 3 is controlled based on the sheet interval time of the sheets supplied from the image forming apparatus to the sheet post-processing apparatus, so that the uniformity of sheets on the processing tray can be stabilized without incurring performance degradation. the

As one form (modified example) of this embodiment, based on the paper sheet interval time and each post-processing (sorting) at the standard printing speed of the image forming apparatus 200 (for example, A4 size monochrome printing speed 65 sheets/min), And the average processing speed of the binding process) has set the prescribed threshold value of the paper interval time through the above-mentioned conveying path 26, but it is not limited to this, as long as the overall performance is considered, the valve of the number of buffer pages and the paper interval time is appropriately set. value. the

(without post-processing)

When post-processing is not performed, for example, the stacking tray 13 slides to the position indicated by the dotted line in FIG. 3 , and the sheets P discharged from the standby tray 3 can be stacked consistently. For example, when using an image forming apparatus connected to a network or performing a large amount of printing, the paper P conveyed from the entrance roller 1 to the exit roller 2 via the conveyance path 26 is conveyed toward the standby tray 3 by the exit roller 2 . Then, the paper P descends onto the standby tray 3 , is conveyed by the turning rollers 14 , and is discharged onto the stack tray 13 . the

Moreover, when the post-processing is not performed and the operator of the image forming apparatus performs copying or the like on the image forming apparatus, as shown in FIG. The branched conveyance path 101 is discharged by the roller pair 102 and stacked on the paper loading unit 103 . the

(second embodiment)

The structure for buffering the paper until the paper falls to the processing tray is not limited to the configuration of the standby tray 3 described above. In the first embodiment, the standby tray 3 is arranged obliquely in the paper post-processing apparatus, and the front end of the paper stacked on the standby tray 3 is positioned higher than the rear end. In view of this, the sheet post-processing device 101 according to the second embodiment has the configuration shown in FIG. 15 . The basic configuration of the sheet post-processing device 101 is the same as that of the sheet post-processing device 100 according to the first embodiment, and therefore, the description will focus on the characteristic differences. the

As shown in FIG. 15 , a sheet on which an image has been formed by an image forming apparatus 101 is received by a pair of entrance rollers 1 and supplied to a pair of exit rollers 2 . Between the entrance roller 1 and the exit roller 2, a conveyance path is formed. Before and after the conveyance path, paper detection sensors S1 and S2 are arranged opposite to the conveyance path, for detecting the front end and rear end of the paper in the conveyance path. In the vicinity of the sheet detection sensor S1 on the entrance roller 1 side, a gate member G for switching the conveyance path of the sheet is provided. Substantially below the pair of exit rollers 2 , a paper loading unit 300 serving as a paper standby unit is arranged substantially parallel to the conveyance path. The paper carrying unit 300 includes: a paper carrying platform 300 a , a rack gear 306 , and a paper carrying platform moving motor 307 . the

The paper supporting platform 300a is arranged horizontally in the paper post-processing device 101 and can stack multiple sheets of paper. The sheet stage 300a is formed, for example, as a pair of members with substantially L-shaped cross-sections facing each other, or as an integral disc shape, and stacks and supports sheets discharged from outlet rollers 2 . The paper table rack 300b formed on the lower part (the back side of the paper stacking surface) or the side part of the paper table 300a is formed to mesh with the rack gear (pinion) 306 and moves as the rack gear 306 rotates. , can move in the direction (horizontal direction) in which the support of the sheets stacked on the sheet stage 300a is released. In addition, the rack gear 306 is driven by a sheet stage moving motor 307 . the

Above the paper stage 300 a on the downstream side in the paper conveyance direction, there is provided a rotating body 14 a that is rotationally driven by a drive motor 302 and pivotably supported with respect to a shaft 303 . This rotating body (hereinafter, referred to as a rotating roller 14a) is arranged so as to be able to move up and down based on the operation of a driving source described later. The turning roller 14a and the nip roller 14b constitute the turning roller pair 14, and this nip roller 14b and the turning roller 14a make a pair. The turning roller 14a presses the paper against the nip roller 14b at the lowered position. On the upstream side of the paper carrying table 300a in the paper conveyance direction, a pinch handle 3a for pinching the rear end of the stacked paper is arranged. The clamp handle 3a operates to hold the rear end of the paper or to release the held portion based on the operation of a solenoid not shown. the

The paper stage 300a may be configured to be freely expandable and contractible so as to be accommodated below the transport path, that is, below the exit roller 2 and the entrance roller 1 , in addition to linear motion in the horizontal direction. That is, when stacking and supporting sheets, they expand in the direction of sheet conveyance, and when sheets are dropped to the processing tray, they are stored while shrinking at a position below the conveyance path. Known techniques can be used for the details of the freely expandable and contractible configuration, so details will not be described here. Such a configuration is preferable since the overall size of the sheet post-processing apparatus can be reduced if it is configured to be freely expandable and contractible. A blade 305 is provided above the processing disk 4 . the

Next, a stacking method for stacking three sheets of paper on the paper loading unit 300 provided as a paper standby unit that temporarily waits for paper transported from the image forming apparatus will be described. the

Next, description will be made with reference to FIGS. 16 , 17A to 17L. FIG. 16 shows the situation when the first sheet of paper is newly transported to the paper loading unit 300 . That is, when the first sheet of paper P1 is newly transported, the paper bundle T in the previous post-processing process is piled up in the processing tray 4. The stage 300a performs paper buffering. 17A to 17L schematically show the situation where three sheets are stacked on the sheet stage 300a. the

First, when the front end of the first sheet of paper P1 discharged from the exit roller 2 is conveyed to the vicinity of the turning roller 14a, the turning roller opening and closing magnet (not shown) is activated, and the turning roller 14a is raised to the raised position along the upward direction. This is to prevent the front end of the first conveyed sheet from hitting the turning roller 14a (see FIG. 17A ). At this time, the turning roller 14a rotates in the conveying direction. After the paper P1 is conveyed substantially directly below the turning roller 14a, the turning roller 14a is lowered in the D direction (see FIG. 17B ). the

Since the turning roller 14 a rotates in the conveying direction, the paper P1 clamped by it and the nip roller 14 b is further conveyed and discharged from the exit roller 2 , so that the entire paper is stacked on the paper supporting portion 300 . At the same time, the rotation of the rotary roller 14a is stopped (see FIG. 17C). the

After stacking, the rotating roller 14a is reversed by about several pulses (for example, 1 to 5 pulses), and the paper P1 is conveyed by turning in the direction of the rear end of the paper stage 300a. Then, the electromagnetic solenoid ES etc. are operated to rotate the clamping handle 3a in the direction of the arrow Q to hold the rear end of the paper P1 of the first page, and the stacking of the paper of the first page on the paper loading part 300 is completed (see FIG. 17D). Swing conveying is performed to secure (clamp) the trailing end of the paper. the

Then, when the front end of the second page of paper P2 is transported to the vicinity of the turning roller 14a, the turning roller opening and closing magnet is activated, and the turning roller 14a that clamps the first page of paper on the paper supporting part 300 rises to the raised position. In addition, in this state, the rotary motor is rotated in the forward direction to rotate in the transport direction (see FIG. 17E ). This is so that even if the second sheet of paper hits the turning roller 14a, jamming will not occur. At this time, the rear end of the first sheet of paper P1 stacked on the paper loading portion 300 is held by the pinch handle 3a, and although the turning roller 14a rotates in the conveying direction, since it is in the raised position, it will not Feeds the first sheet of paper. the

Afterwards, before the second sheet of paper P2 is discharged from the exit roller 2 and stacked on the paper loading unit 300, after the front end of the paper passes the paper detection sensor S2, after a predetermined time elapses, the first sheet held by the clamp handle 3a is released. The timing when the trailing end of the paper P1 of the first page and the leading end of the second paper P2 reach a predetermined position on the upstream side of the conveying direction of the leading end of the first paper, for example, a position shifted by 10 mm from the position of the leading end of the first paper. , the rotating roller 14a held at the raised position is rotated in the conveying direction, and is lowered in the arrow D direction (see FIG. 17F ). the

Through this operation, two sheets of paper are conveyed with the first sheet P1 and the second sheet P2 shifted at the leading end side (in the conveying direction, the leading edge of the first sheet is ahead of the leading edge of the second sheet). The pulses of the pulse motor PM conveying the second sheet of paper P2 are counted, and at the timing when the difference between the leading ends of the two sheets of paper P2 becomes 10 mm, the rotating turning roller 14 is lowered and bit into it. The first and second sheets of paper P1 and P2 are conveyed downstream simultaneously by the turning roller 14a until the trailing end of the second sheet of paper P2 is discharged from the exit roller pair 2 (see FIG. 17G ). the

After the ejection of the paper P2 through the exit roller 2 is completed, the rotation of the rotary roller 14a is stopped, the exit roller 2 is reversed by several pulses, and with respect to the paper rear end, two sheets of paper P1 are conveyed by turning on the paper rear end side of the paper stage 300a , P2, the rear end of the second page of paper P2 is held by the clamp handle 3a similarly to the first page (see FIG. 17H). the

As described above, the paper front end and the paper rear end of the two paper sheets whose positions are shifted are held, and the stacking on the paper loading unit 300 is completed. the

Next, when the front end of the third page of paper P3 is transported to the vicinity of the turning roller 14a, the turning roller opening and closing magnet is activated, and the turning roller 14a used to press the first and second pages of paper on the paper supporting part 300 Ascend to raised position. In this state, the rotation motor is rotated forward, and the rotation roller 14a is rotated in the conveyance direction (see FIG. 17I ). the

At this time, since the clamping handle 3a remains stacked on the rear ends of the first and second sheets of paper in the paper carrying portion 300, and the turning roller 14a is positioned at the raised position although it rotates in the conveying direction, it is not necessary to The first and second pages are fed. the

When the rear end of the third sheet of paper P3 is discharged from the exit roller 2 and before the stacking on the sheet carrier 300 is completed, that is, by calculating the pulse of the pulse motor PM driving the exit roller pair 2, the second sheet of paper P2 When the leading edge substantially overlaps with the leading edge of the third sheet P3, the pulse motor PM is stopped. Further, while releasing the clamp handle 3a, the turning roller 14a at the raised position is lowered in the arrow D direction while rotating in the transport direction (see FIG. 17J ). At this time, since the turning roller 14a rotates in the conveying direction, the paper is conveyed downstream, but after several pulses, the rotation of the turning roller 14a is stopped. the

Through this operation, without changing the offset positional relationship between the first page and the second page, the third sheet P3 is overlapped on the second sheet P2 so as to be aligned with the leading edge of the second sheet. the

The stacking stagger amount of the three sheets of paper on the paper loading unit 300 is as follows: the first sheet is located at the leading position on the most downstream side in the conveying direction, and the second and third sheets are located approximately 10 mm upstream from this position. superior. With this positional relationship, each sheet is conveyed while being pressed against the sheet loading unit 300 by the rotating roller 14a (see FIG. 17K ). the

After the discharge of the paper P3 is completed, the rotation of the turning roller 14 a is stopped, and the turning roller 14 a is reversed to carry out turning transport and stops. Three sheets of paper are stacked on the paper loading unit 300 with the positions of the above-mentioned leading ends shifted (see FIG. 17L ). In addition, when the subsequent fourth sheet of paper that has been conveyed is also placed on standby, it may be processed in the same procedure as the stacking of the above-mentioned third sheet of paper. the

Next, the process of dropping and supplying the sheets stacked on the sheet loading unit 300 to the processing tray 4 will be described. 18A to 18C are for schematically explaining the case of drop provision. the

Since the sheet loading section 300 is configured to move linearly in the horizontal direction, it moves to the exit roller 2 side when there is no subsequent sheet stacked on the sheet loading table 300a (see FIG. 18A ). Since the rear end of the paper is not held by the clamp handle 3a, there is a possibility that the rear end of the paper slightly floats up from the paper carrying table 300a during the movement of the paper carrying table 300a. The rollers 14b hold the stacked sheets so that they are not scattered. the

If the paper stage 300a is completely moved, the rear ends of the three paper sheets hang down due to their own weight (see FIG. 18B ). the

In addition, switch the rotating roller 14a to the ascending position, release the clamping of the paper, then on the processing tray 4 disposed below the paper carrying part 300, three sheets of paper will fall from the rear end of the hanging paper, and the paper will be placed on the processing tray 4 Slide up and coincide with the paper rear end positioning part 4a of the processing tray 4. When the paper falls, the blade 305 is rotated to adjust the uppermost paper (see FIG. 18C ). Therefore, since the sheets dropped onto the processing tray 4 fall onto the processing tray 4 from the rear end of the sheets, the longitudinal uniformity on the processing tray 4 is good. Moreover, when continuing to convey the fourth page or the paper that does not need buffering, the paper carrying platform 300a is reset to the original position on the side of the rotating roller pair 14, as mentioned above, the following paper is clamped by the rotating roller pair 14, and the paper is carried. The table 300 a moves to the exit roller 2 side (see FIG. 18A ), and the paper is dropped and supplied to the processing tray 4 . In addition, the same effect as that of the first embodiment can be obtained in the longitudinal alignment adjustment of the lowermost (first sheet) sheets stacked in the processing tray 4 . the

In addition, in this embodiment, for the purpose of securing the rear end holding (clamping) amount before holding the rear end, rotary conveyance is carried out, but needless to say, by appropriately selecting the shape and size of the clamping handle 3a When rear end holding can be achieved even without performing rotary transport, rotary transport can be omitted. In addition, in the present embodiment, the paper loading table 300a of the paper loading unit 300 is installed horizontally, but the entrance roller 1 and the exit roller 1 of the paper post-processing device 101 may be changed according to the height position of the paper discharge unit of the image forming apparatus 200. The arrangement of the rollers 2 is such that the rear end side of the paper is positioned lower than the front end of the paper, and the paper loading unit 300 is arranged obliquely. In addition, in the second embodiment of the present invention, in order to improve the processing performance and uniformity of the paper post-processing device 101 , it is also effective to increase or decrease the number of buffered sheets to the paper loading unit 300 based on a predetermined paper interval time. the

(third embodiment)

By increasing the speed of paper processing in the paper post-processing device, the charge amount of the paper increases. For example, when the paper is transported to the standby tray 3 or dropped to the processing tray, it may become sticky and may not move to the expected position. . the

In order to avoid impropriety in the post-processing process, it is required that the paper stacked on the standby tray 3 is not charged. Therefore, it is preferable to reliably remove static electricity before the paper passes through the standby tray 3 . the

As described above, the paper post-processing apparatus according to this embodiment prepares a plurality of paper transport paths in order to adapt to the presence or absence of post-processing and the contents of post-processing. In addition, it is preferable that static electricity can be reliably eliminated before paper sheets are stacked on the standby tray 3 regardless of the path. the

Next, the static eliminating member will be described with reference to FIG. 19 . As shown in FIG. 19 , downstream of the exit roller 2 , a paper biasing arm 16 as a paper biasing means capable of switching the state of contact with the paper is disposed. The paper bias arm 16 plays a role of smoothing the conveyance of the paper conveyed from the exit roller 2 . The paper biasing arm 16 is formed of a conductive member (for example, a plate made of stainless steel). The paper biasing arm 16 is rotatable in the up and down direction of the arrow A by a cam follower arm 17 which is cam-driven by the rotational drive of the auxiliary arm motor 19 shown in FIG. 19 . the

Furthermore, a static elimination member 15 is attached to one end portion of the paper biasing arm 16 downstream in the conveying direction. It is preferable that the static elimination member 15 is formed by kneading an extremely thin stainless steel wire into a brush shape. In addition, the standby tray 3 is located below the paper biasing arm 16 . the

When the paper is conveyed while being pinched by the exit rollers 2, it is charged by friction. Then, the paper conveyed from the exit roller 2 is guided to the paper biasing arm 16 , and the paper is conveyed while the paper comes into contact with the static elimination member 15 . the

Next, the operation of the sheet biasing arm 16 when stacking sheets on the standby tray 3 will be described. By rotating the paper assist arm motor 19 , a cam (not shown) is rotated, and the cam follower arm 17 is swung. By rocking the cam follower arm 17, the paper biasing arm 16 is raised and rotated in the direction of the upward arrow in FIG. 19 . In addition, the rotational angular position of the cam is detected by means of the cam sensor slot 18 . the

The rotatable paper biasing arm 16 stops at three positions of (1) standby position, (2) neutralization position, and (3) pressing position. The standby position is the uppermost position, and the paper biasing arm 16 is located at this standby position until the front end of the paper reaches the turning roller 14 . The static elimination position is the middle position, and the paper biasing arm 16 is located at the static elimination position when the paper is discharged in a straight line without post-processing. the

The pressing position is the lowest position, and the paper biasing arm 16 moves to this pressing position when the rear end of the paper passes the exit roller 2 when the paper is stacked on the standby tray 3 . When the paper is stacked on the standby tray 3, press the paper on the standby tray 3 to prevent the paper from floating and messing up. the

As mentioned above, after the stacking on the standby tray 3 is completed, the standby tray drive motor (not shown) is rotated forward, the standby tray 3 is opened and moved along the lateral direction of the paper, the blade 5 is moved, and the paper is moved toward the processing tray. 4 falls. When the standby tray 3 is opened in a direction perpendicular to the transport direction, the auxiliary paper falls through the lower half of the static elimination member 15 . the

According to the present embodiment, the posture of the paper offset arm 16 can be held at an arbitrary angle, and a wide range of types of paper conveyed from an image forming apparatus can be handled, for example. Even during paper conveyance, the posture of the paper bias arm can be changed, so it can correspond to the state of the paper. In addition, it is possible to reliably eliminate the static electricity by rubbing the static electricity removing member against the paper regardless of the paper conveyance path. the

(Fourth Embodiment)

Next, when the paper falls from the standby tray 3 to the processing tray 4, the blades for flapping the paper for longitudinal adjustment will be described. the

FIG. 20 is a schematic view of the blade 5 viewed laterally. The blade 5 plays the following role: when the paper stacked in the standby tray 3 falls onto the processing tray 4 (in this embodiment, it is called active drop), it prevents the paper from being scattered during the falling process by tapping the rear end of the paper. And the paper that falls off is adjusted longitudinally on the processing tray 4 as early as possible. Therefore, in order to improve performance, high-speed rotation is required. the

Therefore, in the present embodiment, the rotation of the blade 5 is appropriately controlled in order to reduce the impact sound when the paper is slapped, the wind sound when the paper is rotated with good momentum, and the like. the

As shown in FIG. 20, the blade 5 includes: a reel 20, which is a rotating body supported on the blade rotating shaft 22; a shorter blade P1 mounted on the reel 20; and a longer blade P2. In order not to damage the paper even if it touches the surface of the paper P, both the paddle P1 and the paddle P2 are made of elastic body. By the short blade P1 , paper can be dropped from the standby tray 3 to the processing tray 4 . In addition, the paper falling into the processing tray 4 can be longitudinally adjusted by the long blade P2. In addition, the number of blades 5 to be arranged is not limited to one, and a plurality of blades may be arranged side by side at predetermined intervals depending on the size of paper to be processed. In this embodiment, two blades P1 and P2 are provided. the

The thus constructed blade 5 is driven in rotation by pulse management of the blade motor. First, the vane motor is rotated forward, and the drive is transmitted to the vane rotating shaft 22 to rotate the spool 20 . the

FIG. 21 is for explaining the temporary stop control during the rotation of the blade 5 . the

The pulse of the blade motor is calculated, the rotation angle of the blade rotating shaft 22 is controlled, and the rotation of the blade 5 is temporarily stopped after the paper is dropped from the standby tray 3 to the processing tray 4 by the short blade P1. That is, as shown in FIG. 22, the rotation of the blade 5 is temporarily stopped at a position where a predetermined gap Q2 is maintained between the paper surface on the processing tray 4 and the long blade P2. The number of sheets of paper stacked on the processing tray 4 varies according to the post-processing content set by the user. However, since it is calculated separately, the predetermined interval Q2 here is only the distance that the long blade P2 does not touch the paper surface. The interval Q1 between the short blade P1 and the paper surface is controlled to have a relationship of Q1≤Q2, however, if the stacking of the paper P increases, it becomes 0≤Q1<Q2. In this way, the rotation of the blade 5 is temporarily stopped at the position where the long blade P2 does not touch the paper surface, so as not to hinder the longitudinal adjustment of the longitudinal adjustment roller 7 . Furthermore, by temporarily stopping, the noise accompanying the high-speed rotation of the blade 5 can be reduced. the

After the temporary stop, for example, several msec has elapsed, the rotation of the blade 5 is performed again during the lengthwise adjustment of the rotation of the lengthwise adjustment roller 7 . Based on this motion control, the long blade P2 guides the paper falling onto the processing tray 4 to the inside of the processing tray 4, thereby reliably performing longitudinal adjustment. the

Next, the timing of paper conveyance and blade operation will be described. FIG. 22 schematically shows the transport trajectory of the front end of the paper on the processing tray 4 . In addition, FIG. 23 is an explanatory diagram for explaining the relationship between the ON/OFF control of the blade rotation operation and the position of the front end of the paper. In FIGS. 22 and 23 , A indicates a position on the conveyance upstream side of the exit roller 2, B indicates the position of the front end of the paper on the standby tray 3, C indicates the position of the front end of the paper on the processing tray 4, and D indicates, for example, the stapling position. . the

The paper is transported from position A to position B by the transport unit, and after the paper is dropped and stacked on the standby tray 3, the blade motor is driven. As described above, by this action, the short blade P1 slaps the paper onto the processing tray 4 . Also, the paper is moved from position B to position C. When the long blade P2 rotates to a position where it does not touch the upper surface of the paper on the processing tray 4, the blade rotating shaft 22 stops the blade motor. In this operation, the sheets on the processing tray 4 start to move by inertia from the position C toward the position where stapling is possible at the position D. As shown in FIG. When the paper on the processing tray 4 reaches the position where it can be adjusted longitudinally, the blade motor action starts again. As shown in Figure 23, this series of actions is realized by turning the ON control blade 5 during the process of moving from position B to position C and from position C to position D. the

Regarding the application of longitudinal adjustment force to the papers stacked on the processing tray 4 , the paper on the upper side depends on the blade 5 being snapped in, and the paper on the lower side depends on the longitudinal adjustment roller 7 . Therefore, regarding the sheets stacked staggered on the standby tray 3, the first sheet of paper is adjusted by reversing the lengthwise adjustment motor to reversely drive the lengthwise adjustment roller 7, and the blade motor is rotated forward to adjust the second page lengthwise through the blade 5, Third page of paper. the

In addition, by making the first sheet of paper to which a stable longitudinal adjustment force is applied by the longitudinal adjustment roller 7 be located at a shifted position further downstream in the conveying direction than the second and third sheets, the friction of the paper can be used to straighten the first sheet. The vertical adjustment force of 2 is applied to the second page, and then the third page. the

As mentioned above, the transport of the paper to the processing tray 4 and the longitudinal adjustment can be realized by one rotation of the blade 5 . the

According to the present embodiment, it is possible to reduce the impact sound of beating paper. In addition, by temporarily stopping the blade 5 before one rotation, the number of rotations of the blade is reduced to one rotation, so paper can be supplied from the image forming apparatus at high speed, and there is sufficient room for adjustment without affecting the post-processing time. the

(fifth embodiment)

When engaging a rotating member such as the blade 5 with the rotating shaft, generally, a groove is formed on the rotating shaft, and a pin is inserted into the groove. Therefore, a gap of a certain size is required between the groove and the pin, and instability may occur. Therefore, when the rotating member such as the rotating blade 5 beats the paper, impact or vibration occurs to generate noise. While attempts have been made to minimize the tolerances between the slots and pins, there are limitations in manufacturing. the

Therefore, in the present embodiment, a configuration is adopted in which the parallel pins used to engage the rotating member do not vibrate during the rotation of the blade 5 . the

Next, referring to FIGS. 24 to 26 , a case where the parallel pin 23 is used to engage the spool 20 of the blade 5 will be described. the

FIG. 24 is a perspective view showing that the spool 20 is engaged. As shown in FIG. 24 , a rotating shaft 22 loosely penetrates through the central portion of the spool 20 . A parallel pin 23 penetrates through the rotary shaft 22 so as to pass substantially through the center of the shaft. In the central portion of the bobbin 20, a groove 24 for fitting the parallel pin 23 is formed. In addition, inside the groove 24, two protrusions 21 are formed. The shape of the protrusion 21 is, for example, a mountain shape. the

Fig. 25 shows the relationship of parallel pins, rotating shafts, spool portion grooves, and the like. the

As shown in FIG. 25 , the size of the spool portion groove 24 of the spool 20 is set such that the center C1 of the hole of the rotating shaft 22 and the center C2 of the spool portion groove 24 are shifted to form the spool portion. groove. For example, the parallel pin 23 is Φ2 and made of stainless steel. The spool part groove 24 and the spool part protrusion 21 are formed integrally with the spool and are made of a resin mold. The material of the rotating shaft 22 is free cutting steel, for example. the

As the parallel pin 23 , a material having a stronger strength than the bobbin portion protrusion 21 formed in the bobbin portion groove 24 is selected. the

The dimension from the top 21 a of the protrusion 21 to the long side of the spool portion groove 24 is smaller than the outer diameter of the parallel pin 23 , for example, 1.87±0.3 mm. the

In such a configuration, one side of the parallel pin 23 is pushed into the rotation shaft hole on the side along the long side of the spool portion groove 24 of the spool 20 to insert the parallel pin 23 . Thereby, the protrusion 21 formed in the groove 24 of the bobbin part is crushed, so that the parallel pin 23 does not become unstable. In the foregoing example, the crushing is about 0.13 mm from the top 21 a of the protrusion 21 . the

A method of applying force to the parallel pins 23 will be described. As shown in FIG. 25 and FIG. 26 , the parallel pin 23 is pressed against the side surface of the groove 24 of the bobbin portion, and on the other hand, the two projections 21 are crushed. Therefore, external forces P, P act on the parallel pin 23 from the protrusion 21, and external forces P', P' of the same magnitude act from the side surface. Therefore, the forces acting on the parallel pins 23 can be balanced so that instability can be eliminated. the

In this way, the position where there is concern about the occurrence of noise due to instability between the parallel pins may not be limited to the vane. the

According to this embodiment, the tolerances of the rotating shaft and the parallel pins, and the tolerances of the rotating shaft and the bobbin can be loosely managed, so that reliable gap fitting can be realized without deteriorating the manufacturability of these components. Also, since the parallel pins do not rattle, vibration noise can be reduced. the

(sixth embodiment)

As described above, after the sheets passed through the standby tray 3 are dropped onto the processing tray 4 and vertically and horizontally adjusted, for example, stapling processing is performed. That is, the lateral adjustment plate 6 can be driven to perform lateral adjustment. the

However, the content of the post-processing desired by the user is rich in variety, and there is a need to sort papers with a small number of pages. the

Therefore, in this embodiment, it is configured so that it can cope with post-processing that is not required to be strictly consistent with the binding process. the

That is, in this embodiment, sorting processing can be performed on the standby tray 3 without passing through the processing tray 4 . As mentioned above, in the standby tray 3, three sheets of paper can be buffered at the maximum. Therefore, regarding the paper within three pages, the sorting process can be performed on the standby tray 3 without going through the processing tray 4. As for the sorting process of stacked sheets exceeding three pages, it can be dealt with by repeatedly performing the sorting process of the standby tray 3 in units of three pages. For example, the second sorting process is performed from the fourth page to the sixth page, and the third sorting process is performed from the seventh page to the ninth page. the

Next, the classification processing of the standby disk 3 will be described. The standby tray 3 is constituted by a pair, and includes a standby tray portion 3L and a standby tray portion 3R, the standby tray portion 3L is supported from the left side in the width direction of the paper with respect to the transport direction, and the standby tray portion 3R is supported from the left side in the width direction of the paper. Support on the right side. FIG. 27 is a perspective view showing the vicinity of the standby disk 3 . As shown in FIG. 27 , the paper passing through the exit roller 2 temporarily stands by in the standby tray 3 while being bitten by the turning roller 14 and the standby tray pinch roller 25 (see FIG. 3 ). From this state, the rotating magnet (not shown) is operated temporarily, and the clamping of the rotating roller 14 is released. In addition, the standby disk drive motor is operated, and as shown in FIG. 28, for example, in the figure, the right standby disk portion 3R is displaced by a predetermined amount to the left (in the direction of the arrow). As a result, the stacked paper ends can be pressed by the right lateral wall to be displaced to the left. After the shift, the paper end is again clamped by the turning roller pair 14 (refer to FIG. 29 ). Then, the rotation motor is rotated in the forward direction, and the sorted sheets are discharged onto the stacker tray 13 . the

In addition, not only the right standby tray 3R but also the left standby tray 3L moves to the left in a retracted manner, thereby obtaining a larger amount of sorting. Similarly, the standby tray unit 3L can be moved to the right to shift the paper P. In addition, by switching the moving directions of the standby tray sections 3R and 3L to discharge paper in accordance with each print job, offset discharge that can be visually and physically recognized can be realized. the

According to this embodiment, the paper can be sorted on the standby tray without conveying the paper to the processing tray, so the time required for the sorting process can be greatly shortened. Also, since paper is not flapped, noise can be reduced. the

The present invention is not limited to the above-described embodiments, and the constituent elements may be modified and embodied within the range not departing from the gist at the stage of implementation. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some constituent elements may be deleted from all the constituent elements shown in the embodiments, and constituent elements in different embodiments may be appropriately combined. the

Claims (20)

1. A paper post-processing device, comprising: A processing tray, stacking multiple sheets of paper conveyed from the image forming device for post-processing; a paper standby unit provided in the middle of a transport path for transporting the paper to the processing tray; a paper carrying part, arranged on the paper standby part, for carrying the paper; a rotating body provided above the paper standby unit on the downstream side in the transport direction, and supported in a liftable manner; Switching components, switching the rotating body to the ascending position and the descending position; The driving source rotates the rotating body to convey the paper, Wherein, the switching member and the driving source are driven to control the paper conveying action of the rotating body, Among the plurality of sheets stacked in the sheet standby unit, the leading edge of the first sheet is shifted by a predetermined distance on the upstream side in the conveying direction and the leading edge of the first sheet is ahead in the sheet conveying direction. position, align the leading edge of the paper after the second page for loading. 2. The paper post-processing device according to claim 1, wherein, When the post-processing is being performed in the processing tray or the post-processed paper is being discharged and conveyed, a plurality of sheets of paper that are newly conveyed for the post-processing are temporarily put on standby in the paper standby unit for standby. 3. The paper post-processing device according to claim 1, wherein: The paper is moved in a paper support releasing direction by the paper carrying member, and falls onto the processing tray disposed below the paper standby unit. 4. The paper post-processing device according to claim 1, further comprising: In the paper holding member, the predetermined distance by which the position of the paper to be loaded is deviated is greater than or equal to 5 mm and less than or equal to 20 mm, and in the paper standby section, the paper holding member maintains the position deviation, and the second page and later The trailing end of the paper is pressed against the carrier member and held. 5. The paper post-processing device according to claim 1, wherein: The rotating body is controlled to rotate in the conveyance direction of the paper when it is rotated at the ascending position, to press against the paper and rotate at the descending position, to convey while keeping the position shifted, and to press the paper standby part without rotating. paper loaded on top. 6. The paper post-processing device according to claim 1, wherein: When the paper is made to stand by in the standby unit, the paper that is buffered on the carrier member is dropped onto the processing tray without waiting for the subsequent paper to be conveyed for post-processing. , the subsequent paper is temporarily loaded in the carrying member, and then it is dropped onto the processing tray one by one. 7. The paper post-processing device according to claim 1, further comprising: a standby tray, arranged in the paper standby section, including a pair of support members for carrying paper; a driving source for moving the pair of support members of the standby tray in a paper support releasing direction, Wherein, the driving source is controlled so that the supporting member is conveyed along with the paper and moving in a direction perpendicular to the direction so that the multiple sheets of paper loaded in the standby tray fall into the processing tray provided below. 8. The paper post-processing device according to claim 7, wherein: The standby tray is arranged obliquely such that the upstream side is lower than the downstream side with respect to the sheet conveyance direction. 9. The paper post-processing device according to claim 7, wherein: When the number of paper sheets to be post-processed is more than four, after three sheets of paper buffered on the standby tray are dropped onto the processing tray, subsequent paper sheets are temporarily stacked on the standby tray, and then It is dropped page by page onto the processing tray. 10. The paper post-processing device according to claim 7, wherein: When the paper is made to stand by in the standby section, the plurality of sheets buffered on the standby tray are dropped to the processing without holding the subsequent papers conveyed for post-processing. After being placed on the tray, the subsequent papers are temporarily stacked in the standby tray, and then dropped onto the processing tray page by page. 11. The paper post-processing device according to claim 7, wherein: The number of sheets buffered to the standby tray is controlled based on a sheet interval time of sheets supplied from the image forming apparatus. 12. The paper post-processing device according to claim 7, wherein: After the first and second sheets supplied from the image forming apparatus are buffered on the standby tray, and the third sheet is not supplied after a specified time elapses, if post-processing of the sheets on the processing tray is completed , so that the two pages of paper being buffered in the standby tray fall into the processing tray. 13. The paper post-processing device according to claim 7, wherein: After the first and second sheets supplied from the image forming apparatus are buffered on the standby tray, when the third sheet is supplied within a predetermined time, the third sheet is also buffered on the standby tray. 14. A paper post-processing device, comprising: The processing tray stacks and post-processes multiple sheets of paper conveyed from the image forming device; a paper carrying member disposed in the middle of a transport path for transporting the paper to the processing tray; a rotating body disposed above the paper carrying member on the downstream side in the conveying direction, and supported in a liftable manner; A clamping part is arranged on the upstream side of the paper carrying part in the conveying direction, and is used to hold or release the rear end of the paper carried by the paper carrying part; switching means for switching the rotating body to a raised position and a lowered position; and a driving source to rotate the rotating body and convey the paper, Wherein, the switching member, the clamping member and the driving source are driven to control the paper conveying action of the rotating body, Among the plurality of sheets stacked in the sheet carrying member, the leading edge of the first sheet is shifted by a predetermined distance on the upstream side in the conveying direction and the leading edge of the first sheet is ahead in the sheet conveying direction. position, align the leading edge of the paper after the second page for loading. 15. The paper post-processing device according to claim 14, wherein: The paper carrying member moves in a direction in which the support of the paper is released, so that the carried paper falls into the processing tray. 16. A buffering method for post-processing paper, wherein, In the paper standby section provided in the middle of the paper transport path that transports paper to the processing tray, a paper loading member for loading paper is prepared, When the first new sheet of paper to be post-processed is delivered, the paper on the processing tray is being post-processed, carrying the first page of paper in the paper carrying member, carrying the front end of the second sheet at a position upstream in the conveying direction and deviating from the front end of the first sheet by a predetermined distance, Align the paper from the third page onwards with the front end of the second page, and load it in the paper carrying member. 17. The buffering method of post-processing paper according to claim 16, wherein, Above the processing tray, a standby tray including a pair of paper support members for carrying paper is prepared, When the first sheet of paper to be post-processed is delivered, the paper on the processing tray is being post-processed, loading the first page of paper in the standby tray, carrying the front end of the second sheet at a position upstream in the conveying direction and deviating from the front end of the first sheet by a predetermined distance, Align the paper from the third page with the front end of the second page, and place it on the standby tray. 18. The buffering method of post-processing paper according to claim 16, wherein, Time the sheet interval of sheets provided for post-processing, Based on the paper interval time, the number of paper sheets buffered by the paper standby unit is controlled. 19. The buffering method of post-processing paper according to claim 16, wherein, causing the paper standby section to buffer first and second paper sheets supplied for post-processing, counts the paper interval time until the third page is provided, After a predetermined time has elapsed, after the post-processing of the paper on the processing tray is completed, the two sheets of paper being buffered in the paper standby unit are dropped to the processing tray, The third sheet of paper is dropped into the processing tray via the paper standby. 20. The buffering method of post-processing paper according to claim 16, wherein, buffering the first and second sheets supplied for post-processing in said standby tray, counts the paper interval time until the third page is provided, When the third sheet of paper is supplied within a predetermined interval, the third sheet of paper is also buffered in the standby tray.

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