JP2018027829A - Image formation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image formation device that can facilitate taking out a recording medium in which image formation has not been normally executed.SOLUTION: An image formation device 10 includes: a temporary storage tray 310 to which a sheet P is temporarily discharged; a post-processing device 330; a discharge tray 340 to which a sheet subjected to post-processing is discharged; and an arrangement mechanism 390 for arranging the sheet P so that a normal sheet P1 on which image formation has been normally executed and a sheet P2 on which image formation has not been normally executed are arranged mutually in different positions.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an image forming apparatus.

  In Patent Document 1, in a printing apparatus having a purge function for automatically discharging a scratch sheet remaining on a sheet conveyance path when a sheet causing a jam is removed, a plurality of discharge trays and an operator A purge tray selecting means for receiving selection of a tray to be used as a purge tray among the respective discharge trays, a purge tray storing means for storing the tray selected by the purge tray selecting means as a purge tray, and a scratch sheet In this case, there is described a printing apparatus that includes: a discharge control unit that specifies a purge tray based on the purge tray storage unit and discharges a scratch sheet to the purge tray when the print sheet is generated.

  In Patent Document 2, an automatic document feeder, a copying machine main body for copying an image of a document image conveyed by the automatic document feeder onto paper, and a plurality of papers image-formed by the copying apparatus main body are post-processed. In the image forming apparatus having the processing device, the post-processing device transports the copy sheet to the first position and then aligns and moves the copy sheet to the second position, and the aligned sheet bundle at the second position. And a post-processing means for performing post-processing, and receiving a signal for temporarily stopping image formation on the copy paper, not a copy paper conveyance failure in the copying apparatus, and already forming an image in response to the signal Means for discriminating between valid copy paper and unnecessary copy paper, and discharging the valid copy paper and unnecessary copy paper to the post-processing device, and using the discrimination means for valid copy paper Alignment means Matched to the position, the image forming apparatus characterized by having a paper transport control means for discharging the invalid paper the first position is described.

Japanese Patent Laid-Open No. 11-292389 JP 7-165364 A

  A plurality of recording media ejected from the image forming apparatus may contain a mixture of recording media that have not undergone normal image formation, and it is desirable that recording media that have not undergone normal image formation be easily removed.

  An object of the present invention is that image formation is not performed normally compared to a technique in which a recording medium in which image formation has been performed normally and a recording medium in which image formation has not been performed normally are arranged at the same position. Another object of the present invention is to provide an image forming apparatus capable of easily taking out a recording medium.

  According to a first aspect of the present invention, there is provided an image forming unit for forming an image on a recording medium, a first discharge unit for temporarily discharging a recording medium formed by the image forming unit, and the first discharge. A post-processing device that performs post-processing on the recording medium discharged to the recording unit, a second discharge unit that discharges the recording medium post-processed by the post-processing device, and a recording medium on which image formation has been normally performed And an arrangement mechanism that arranges the recording medium so that the recording medium on which the image formation is not normally performed is arranged at different positions on the first discharge unit. .

  According to a second aspect of the present invention, the arrangement mechanism suppresses movement of the recording medium in a state where image formation is normally performed and discharged to the first discharge portion on the first discharge portion. The image forming apparatus according to claim 1, further comprising a movement suppression mechanism.

  According to a third aspect of the present invention, the movement suppressing mechanism includes a sandwiching member that sandwiches the recording medium from both sides in a direction intersecting the moving direction of the recording medium, and the sandwiching member is disposed in the first discharge unit. 3. The image forming apparatus according to claim 2, wherein a recording medium that has been ejected and image formation has been normally performed is sandwiched.

  According to a fourth aspect of the present invention, the pinching member is a recording in which image formation is normally performed only when a recording medium on which image formation has been normally performed is already discharged to the first discharge portion. The image forming apparatus according to claim 3, wherein the medium is sandwiched.

  According to a fourth aspect of the present invention, the sandwiching member supports a recording medium on which image formation has not been performed normally from the lower side in the direction of gravity, and is a recording medium on which image formation has not been performed normally. 5. The image forming apparatus according to claim 3, wherein after the number of recording media supported from the lower side in the direction reaches a predetermined number, the recording medium in which image formation is normally performed is not sandwiched.

  According to a sixth aspect of the present invention, the arrangement mechanism includes a moving mechanism that moves a recording medium, on which image formation has not been normally performed, to move backward on the first discharge unit. Or an image forming apparatus.

  According to a seventh aspect of the present invention, when the moving mechanism includes a recording medium that has been post-processed in the second discharging unit, the recording medium in which image formation is not normally performed is the first discharging unit. The image forming apparatus according to claim 6, wherein the recording medium on which image formation has not been normally performed is moved so as to remain in the portion.

  In the present invention according to claim 8, in the moving mechanism, the end of the recording medium in which image formation is not normally performed protrudes from the end of the recording medium in which image formation is normally performed and stacked. 8. The image forming apparatus according to claim 6, wherein the recording medium that has not been normally formed is moved backward so as to be in a state.

  According to a ninth aspect of the present invention, the post-processing apparatus includes a recording medium in which image formation is normally performed and a recording medium in which image formation is not normal in which the post-processing apparatus is disposed at different positions by the moving mechanism. Among these, the recording medium on which image formation has been normally performed can be post-processed, and the recording medium on which image formation has not been normally performed is disposed at a position where post-processing cannot be performed. Item 9. The image forming apparatus according to any one of Items 1 to 8.

  According to a tenth aspect of the present invention, there is provided a recording medium in which image formation is not normally performed in the first discharge portion when a recording medium in which image formation is not normally performed is discharged in the first discharge portion. The image forming apparatus according to claim 1, further comprising notification means for notifying that the toner has been discharged.

  According to the eleventh aspect of the present invention, the image forming unit stops image formation when a recording medium that has not been normally formed for the first discharge is discharged, and waits for an instruction from an operator. 11. The image forming apparatus according to claim 1, wherein the image formation is resumed.

  According to the first aspect of the present invention, compared to a technique in which a recording medium in which image formation is normally performed and a recording medium in which image formation is not normally performed are arranged at the same position, image formation is performed. Therefore, it is possible to easily take out the recording medium which has not been normally performed.

  According to the second aspect of the present invention, it is possible to make it difficult to cause the stacking failure of the recording medium in the stacked state, as compared with the technique that does not suppress the movement of the recording medium.

  According to the third aspect of the present invention, by sandwiching the recording medium with the sandwiching member, it is possible to hold the recording medium on which image formation has been normally performed and to prevent the recording medium from being collapsed. Can do.

  According to the fourth aspect of the present invention, the recording medium on which image formation has been normally performed is not in the first discharge unit, and is not performed when it is not necessary to perform the pinching by the pinching member, and thus compared with the technique to be performed. Thus, it is possible to enlarge a space for receiving a recording medium in which image formation is not normally performed in the image forming apparatus main body.

  According to a fifth aspect of the present invention, there is provided a technique for sandwiching a recording medium in which image formation is normally performed even after the number of recording media supported from the lower side in the direction of gravity reaches a predetermined number. In comparison, a space for receiving a recording medium in which image formation is not normally performed in the image forming apparatus main body can be increased.

  According to the sixth aspect of the present invention, it is possible to make it easier to take out a recording medium in which image formation has not been performed normally, as compared with a technique in which a recording medium in which image formation has not been performed normally is not retracted.

  According to the seventh aspect of the present invention, even when there is a post-processed recording medium in the second discharge unit, the recording medium in which image formation has not been normally performed is conveyed to the second recording medium. Compared with the technique to be performed, it is possible to reduce the possibility that a recording medium that has not been image-formed normally will be mixed into the post-processed recording medium in the second discharge unit.

  According to the present invention of claim 8, compared with a technique in which the end of the recording medium in which image formation is not normally performed is in a state in which image formation is normally performed and does not protrude from the stacked recording medium, A recording medium on which image formation is not normally performed can be easily seen and gripped.

  According to the ninth aspect of the present invention, compared to a case where the post-processing device is arranged at a position where post-processing can be performed even on a recording medium on which image formation has not been performed normally, image formation is performed. The possibility that post-processing may be performed on a recording medium that has not been normally performed can be reduced.

  According to the tenth aspect of the present invention, it is possible to reduce a possibility that an operator misses a recording medium in which image formation is not normally performed, as compared with a technique that does not include a notification unit.

  According to the eleventh aspect of the present invention, image formation is performed as in the technique in which the image forming unit continues image formation after the recording medium in which image formation has not been performed normally is discharged to the first discharge unit. Since the recording medium on which the next image formation has been performed is not superimposed and discharged on the recording medium that has not been normally performed, it is easy to remove the recording medium that has not been normally formed by the operator.

1 is a diagram illustrating an image forming apparatus according to an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a post-processing unit included in the image forming apparatus according to the embodiment of the invention. FIG. 3 is a block diagram illustrating a control unit included in the image forming apparatus according to the image forming apparatus according to the embodiment of the present invention. FIG. 6 is a diagram illustrating a state in which normal sheets and abnormal sheets are moved to different positions by a moving mechanism included in the image forming apparatus according to the embodiment of the present invention. FIG. 5A is a plan view showing a state in which the sandwiching member is at a position separated from the stacked sheets. FIG. 5A shows a movement suppressing mechanism 500 included in the image forming apparatus according to the embodiment of the present invention. FIG. 5B is a diagram illustrating a state where the sandwiching member is in a position in contact with the stacked sheets. It is sectional drawing which shows the state in the position which contacted the paper in the state in which the clamping member was laminated | stacked, and shows the AA cross section in FIG.5 (B). The operation of the post-processing unit will be described. FIG. 7A is a diagram illustrating a state in which the paper passes under the moving mechanism, and FIG. 7B is a diagram in which the rear end of the paper is dropped. FIG. 7C is a diagram illustrating a state in which the paper moves to the temporary storage tray, and FIG. 7C is a diagram illustrating a state in which the retreat mechanism retracts the normal paper. The operation of the post-processing unit will be described. FIG. 8D is a diagram illustrating a state in which the normal sheet has moved back to a position where the rear end portion of the normal sheet contacts the rear wall portion 314. FIG. FIG. 8F is a diagram illustrating a state in which the sandwiching member and the opposing member move the paper to the discharge tray, and FIG. 8F illustrates a state where the rear end portion of the paper passes through the contact portion between the sandwiching member and the opposing member. It is a figure which shows the state immediately after having performed. The operation of the post-processing unit will be described. FIG. 9G is a diagram illustrating the movement of the paper support unit. FIG. 9H is a diagram in which the paper support unit and the sandwiching member are returned to the original positions. It is a figure which shows a state. It is a flowchart which shows control of the movement suppression mechanism by a control circuit. 6 is a flowchart illustrating control in which the control circuit 182 selects a distance by which the retracting mechanism retracts the sheet.

  Next, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows an image forming apparatus 10 according to an embodiment of the present invention. As shown in FIG. 1, the image forming apparatus 10 includes an image forming unit 100 and a post-processing unit 300.

  The image forming unit 100 has an image forming unit 110 that forms an image on a sheet P used as a recording medium and adopts, for example, an electrophotographic system. The image forming unit 110 includes a photosensitive drum 112 used as an image carrier, a charging device 114 that charges the photosensitive drum 112, a latent image forming device 116 that forms a latent image on the photosensitive drum 112, The image forming apparatus includes a developing device 118 that develops an image and forms a toner image, a transfer device 120 that transfers the toner image onto a sheet, and a cleaning device 122 that cleans the surface of the photosensitive drum 112.

  The image forming unit 100 further includes a fixing device 130. The fixing device 130 fixes the toner image transferred on the surface of the paper onto the paper using, for example, heat and pressure.

  The image forming unit 100 further includes a paper feeding device 140. The paper feeding device 140 supplies paper to the image forming unit 110.

  A paper transport path 150 is formed in the image forming unit 100. The paper conveyance path 150 conveys the paper from the paper feeding device 140 to the image forming unit 110, further conveys the paper to the fixing device 130, and further conveys the paper to the post-processing unit 300.

  The image forming unit 100 includes an image detection device 160. The image detection device 160 is a device that reads an image fixed on a sheet in order to determine whether image formation is normal or image formation is normal. For example, a line sensor can be used. The image detection device 160 is disposed on the downstream side of the fixing device 130 in the paper transport direction.

  The image forming unit 100 further includes a display device 170. The display device 170 is used as a notification device that notifies the operator of the state of the image forming apparatus 10 and the like, and for example, a liquid crystal display panel can be used.

  The image forming unit 100 includes a control unit 180. The control unit 180 includes, for example, a CPU mounted on a substrate, and controls the image forming unit 100 and the post-processing unit 300.

  The post-processing unit 300 performs post-processing on the paper on which the image is formed by the image forming unit 100. Here, examples of the post-processing include a binding process (stapling process) for binding a plurality of sheets, an opening process for forming holes in the sheets, and the like. Details of the post-processing unit 300 will be described later.

  FIG. 2 shows a post-processing unit 300. As shown in FIG. 2, the post-processing unit 300 has a post-processing unit main body 302, and a paper transport path 306 used for transporting the paper P is formed in the post-processing unit main body 302. For example, three transport members 308 are arranged along the paper transport path 306. The conveying member 308 conveys the sheet so as to pass through the sheet conveying path 306.

  The post-processing unit 300 has a temporary storage tray 310. Temporary storage tray 310 is used as a first discharge unit from which the sheet formed by image forming unit 110 is temporarily discharged. In the temporary storage tray 310, an image is formed by the image forming unit 110, and the paper P transported by the paper transport path 150 and the paper transport path 306 is discharged and temporarily stored.

  The post-processing unit 300 further includes a first paper detection device 320. The first paper detection device 320 is used to determine whether paper is present in the temporary storage tray 310.

  The post-processing unit 300 includes a post-processing device 330. The post-processing device 330 performs post-processing on the paper stored in the temporary storage tray 310. As post-processing, as described above, a binding process, a hole opening process, and the like can be given. In this embodiment, a case where the post-processing device 330 performs a binding process will be described as an example. The post-processing device 330 performs post-processing on the rear end Pr side (left end side in FIG. 2) in the paper transport direction of the paper P. The temporary storage tray 310 has a rear wall portion 314 with which the rear end portion Pr of the sheet comes into contact.

  The post-processing unit 300 further includes a discharge tray 340. The discharge tray 340 is used as a second discharge unit that discharges paper that has been post-processed by the post-processing device 330.

  The post-processing unit 300 further includes a second paper detection device 350. The second paper detection device 350 is used to determine whether paper is present in the discharge tray 340.

  The post-processing unit 300 further includes a paper support unit 360. The paper support unit 360 supports the front end Pt side of the paper stored in the temporary storage tray 310 from the lower side in the gravity direction. Details of the paper support 360 will be described later.

  The post-processing unit 300 further includes a sandwiching member 370. The sandwiching member 370 is made of, for example, a roller. The sandwiching member 370 sandwiches the sheet between the opposing member 372 and moves the sandwiched sheet from the temporary storage tray 310 to the discharge tray 340. Details of the sandwiching member 370 will be described later.

  The post-processing unit 300 further includes an arrangement mechanism 390. The arrangement mechanism 390 includes a sheet on which image formation is normally performed by the image forming unit 110 (hereinafter referred to as “normal sheet P1”) and a sheet on which image formation is not normally performed by the image forming unit 110 (hereinafter referred to as “abnormal sheet”). At least a part of the paper P discharged to the temporary storage tray 310 is arranged so as to be arranged in positions different from each other.

  The arrangement mechanism 390 has a moving mechanism 400, and the moving mechanism 400 has a retracting mechanism 410. The retraction mechanism 410 is a mechanism that moves the paper discharged to the temporary storage tray 310 to the rear side (opposite to the paper conveyance direction, left side in FIG. 2), and includes an arm member 412 and a contact member 420. One end of the arm member 412 is supported by the shaft member 414 and can be rotated about the shaft member 414. The contact member 420 is attached so as to be able to rotate to the other end side of the arm member 412, contacts the paper, and moves the paper to the rear side. Details of the moving mechanism 400 will be described later.

  The arrangement mechanism 390 further includes a movement suppression mechanism 500. The movement suppression mechanism 500 is a mechanism that suppresses the movement of the normal paper P1 stored in the temporary storage tray 310 on the temporary storage tray 310. In addition, the movement suppression mechanism 500 includes a sandwiching member 510. The sandwiching member 510 sandwiches the sheet P from both sides in the direction intersecting with the sheet moving direction (conveyance direction). Details of the movement suppression mechanism 500 will be described later.

  FIG. 3 is a block diagram showing the control unit 180. As illustrated in FIG. 3, the control unit 180 includes a control circuit 182, and image data is input to the control circuit 182 via the communication interface 184. The control circuit 182 receives an image formed on the paper P read by the image detection device 160, and determines whether or not the image is normally formed on the paper P based on the input image. Is determined.

  Further, the control circuit 182 receives a signal from the first paper detection device 320 and a signal from the second paper detection device 350. Further, the image forming unit 100 and the post-processing unit 300 are controlled based on the output from the control circuit 182.

  FIG. 4 shows an example of the paper P that is moved on the temporary storage tray 310 by the moving mechanism 400 so that the normal paper P1 and the abnormal paper P2 are arranged at different positions by the moving mechanism 400. It is shown. Here, the moving mechanism 400 is controlled based on the output from the control circuit 182 and operates as follows.

  In this example, the leading end Pt of the abnormal sheet P2 is in a state of protruding from the leading end Pt of the normal sheet P1 in the stacked state. In order to arrange the normal paper P1 and the abnormal paper P2 as in this example, the moving mechanism 400 moves the normal paper P1 rearward to a position where the rear end portion Pr contacts the rear wall portion 314, and The abnormal paper P2 is moved rearward so that the moving distance is shorter than that of the normal paper P1.

  As shown in FIG. 4, the rear end Pr of the normal paper P1 is inserted into the post-processing device 330, and the post-processing device 330 performs post-processing on the normal paper P1. It is possible to apply. On the other hand, the rear end portion Pr of the abnormal paper P2 does not reach the post-processing unit 300. For this reason, the post-processing device 330 cannot perform post-processing on the abnormal paper P2. The detailed operation of the moving mechanism 400 based on control by the control circuit 182 will be described later.

  As shown in FIG. 4, when the normal paper P1 and the abnormal paper P2 are arranged at different positions, as compared with the case where the normal paper P1 and the abnormal paper P2 are arranged at the same position, The operator can easily see the abnormal paper P2, and the operator can easily remove the abnormal paper P2. However, when the abnormal paper P2 is removed to remove the abnormal paper P2 placed on the normal paper P1 in the stacked state, the normal paper P1 in the stacked state may break down. .

  FIGS. 5 and 6 illustrate the operation of the movement suppressing mechanism 500 in the post-processing unit 300. FIG. 5A shows a normal sheet in which a pair of sandwiching members 510 are stacked. FIG. 5B is a plan view showing a state of being arranged at positions separated from P1 (hereinafter referred to as “separated positions”), and FIG. 5B shows a state in which a pair of sandwiching members 510 are stacked. FIG. 6 is a plan view showing a state where the normal paper P1 is in contact with each other and is in a position where the normal paper P1 is sandwiched (hereinafter referred to as “contact position”), and FIG. 6 is a state where the pair of sandwiching members 510 are in the contact position. FIG. 6 is a cross-sectional view showing a cross section taken along line AA in FIG. The movement suppression mechanism 500 operates as described below based on the output from the control circuit 182.

  When the temporary storage tray 310 receives the normal paper P1, the control circuit 182 places the sandwiching member 510 in the separated position. When normal paper P1 is received and there is at least one normal paper P1 in the temporary storage tray 310, for example, when a plurality of normal papers P1 are stacked on the temporary storage tray 310, After the temporary storage tray 310 receives the normal paper P1, the control circuit 182 moves the sandwiching member 510 to the contact position, and the normal paper P1 newly received by the temporary storage tray 310 is already stored. Align with P1.

  When there is no normal sheet P1 in the temporary storage tray 310, the control circuit 182 does not move the sandwiching member 510. As a result, the upper side of the sandwiching member 510 in the post-processing unit 300 is compared with the state in which the abnormal sheet P2 when the sandwiching member 510 is moved is supported by the sandwiching member 510 from below in the direction of gravity. It is possible to widen the space for stacking the abnormal paper P2 positioned in the position.

  On the other hand, when the temporary storage tray 310 receives the abnormal paper P2, the control circuit 182 may place the sandwiching member 510 at the contact position or place the sandwiching member 510 at the separated position.

  When the temporary storage tray 310 receives the abnormal paper P2, and the number of continuously received abnormal paper P2 has not reached the predetermined number, the control circuit 182 moves the sandwiching member 510. Place at the contact position. When the temporary storage tray 310 receives the abnormal paper P2 in a state in which the sandwiching member 510 is disposed at the contact position, the abnormal paper P2 is supported by, for example, one of the pair of sandwiching members 510 from below in the gravity direction. It becomes. When the abnormal paper P2 is supported by the sandwiching member 510 from the lower side in the direction of gravity in this way, a gap is generated between the abnormal paper P2 and the normal paper P1 in a stacked state, and the operator makes a gap. It is possible to easily remove the abnormal paper P2.

  When the temporary storage tray 310 receives the abnormal paper P2, and when the number of abnormal paper P2 continuously received reaches a predetermined number, the control circuit 182 moves the sandwiching member 510 to the separation position. To place. As a result, the abnormal paper P2 falls between the pair of sandwiching members 510, and the post-processing unit 300 is compared with the state in which the abnormal paper P2 is supported by the sandwiching member 510 from below in the direction of gravity. The space for stacking the abnormal paper P2 positioned above the sandwiching member 510 can be widened.

  Further, at the timing when the operator removes the abnormal paper P2 from the temporary storage tray 310, the control circuit 182 places the sandwiching member 510 at the contact position so as to sandwich the normal paper P1 in the stacked state, The movement of the normal paper P1 is suppressed, and the normal paper P1 is less likely to be stacked.

  7, 8, and 9, the movement of the paper P in the post-processing unit 300 and the operation of the post-processing unit 300 are described. The operation of the post-processing unit 300 described below is realized by control based on the output from the control circuit 182.

  As shown in FIG. 7A, when the paper P on which an image is formed by the image forming unit 100 is transported into the post-processing unit main body 302, the control circuit 182 controls the transport member 308 to control the paper P The sheet P is transported toward the temporary storage tray 310 so that the leading end portion Pt passes under the retreat mechanism 410.

  The control circuit 182 further transports the paper P and drops the trailing edge Pr of the paper P as shown in FIG. 7B so that the paper P is placed on the temporary storage tray 310.

  Next, the control circuit 182 controls the retreat mechanism 410 to cause the retreat mechanism 410 to retreat the normal paper P1 that has moved to the temporary storage tray 310. More specifically, the control circuit 182 rotates the arm member 412 around the shaft member 414 so that the contact member 420 can come into contact with the paper P, and as shown in FIG. In a state where the member 420 is in contact with the paper P, the paper P1 is moved backward by rotating the contact member 420.

  When the paper P moved to the temporary storage tray is the abnormal paper P2, the distance by which the retraction mechanism 410 moves the paper P backward is different from the case of the normal paper P1. That is, as described above, the distance by which the retreat mechanism 410 retreats the abnormal paper P2 is shorter than that of the normal paper P1.

If the paper P moved to the temporary storage tray 310 is an abnormal paper P2, the control circuit 182 causes the image forming unit 100 to stop image formation, and further causes the display device 170 to notify the operator of the abnormal paper. The operator is notified that P2 has been discharged to the temporary storage tray, and prompts the operator to remove the abnormal paper P2 from the temporary storage tray 310.

  Thereafter, the image forming unit 100 waits for an instruction from the operator and starts image formation on the next sheet. The instruction from the operator is made, for example, when the operator operates an operation panel (not shown).

  FIG. 8D shows a state in which the normal paper P1 has moved back to the position where the rear end portion Pr contacts the rear wall portion 314 of the temporary storage tray 310. In a state where the normal paper P1 is disposed at the position shown in FIG. 8D, the control circuit 182 controls the post-processing device 330 to perform post-processing on the paper P in the post-processing device 330. Let When the binding process is performed on the paper P, the post-processing device 330 performs a process of binding the normal paper P1 in a state where a predetermined number of normal papers P1 are stacked on the temporary storage tray 310.

  Next, the control circuit 182 moves the contact member 420 to the original position, and moves the post-processed normal paper P1 from the temporary storage tray 310 to the discharge tray 340. That is, the control circuit 182 moves the sandwiching member 370 so that the normal sheet P1 is sandwiched between the sandwiching member 370 and the opposing member 372, and further, the sandwiching member 370 and the opposing member are disposed as shown in FIG. 372 is rotated in the direction indicated by the arrow in FIG. 8E, and the normal sheet P1 is sent out toward the front side.

  FIG. 8F shows a state immediately after the normal paper P1 is sent out and the rear end portion Pr of the normal paper P1 passes through the contact portion between the sandwiching member 370 and the opposing member 372.

  Next, the control circuit 182 moves the paper support unit 360 that supports the normal paper P1 from the lower side in the direction of gravity to a position where the normal paper P1 is not supported as shown in FIG. It is moved to the discharge tray 340 so as to be dropped.

  Next, as shown in FIG. 9H, the control circuit 182 moves the sandwiching member 370 and the paper support portion 360 to their original positions, and receives the next paper P from the post-processing unit 300. Ready for

  FIG. 10 is a flowchart showing the control of the movement suppression mechanism 500 by the control circuit 182. When a series of controls is started, in step S10, which is the first step, the control circuit 182 determines that the sheet P conveyed to the post-processing unit 300 is a normal sheet based on the output of the image detection device 160. It is determined whether it is P1. When it is determined that the paper P conveyed to the post-processing unit 300 is the abnormal paper P2, the process proceeds to step S20, and the paper P conveyed to the post-processing unit 300 is the abnormal paper P2. If it is determined that there is no sheet (normal sheet P1), the process proceeds to step S50.

  In step S <b> 20, the control circuit 182 determines whether there is already normal paper P <b> 1 in the temporary storage tray 310 based on the output from the first paper detection device 320. If it is determined that there is normal paper P1 in the temporary storage tray 310, the process proceeds to step S30. If it is determined that there is no normal paper P1 in the temporary storage tray 310, the process proceeds to step S50.

  In step S30, the control circuit 182 has the number of abnormal sheets P2 in the temporary storage tray 310 (abnormal sheets P2 supported from below in the direction of gravity by the sandwiching member 510) exceeding a predetermined number. It is determined whether or not there is any. If it is determined that the number of abnormal sheets P2 in the temporary storage tray 310 does not exceed a predetermined number, the process proceeds to step S40, and the number of abnormal sheets P2 in the temporary storage tray 310 is determined. If it is determined that the predetermined number has been exceeded, the process proceeds to step S50.

  In step S <b> 40, the control circuit 182 controls the sandwiching member 510 so that the normal sheet P <b> 1 discharged to the temporary storage tray 310 is sandwiched between the sandwiching member 510.

  On the other hand, in step S <b> 50, the control circuit 182 does not control the normal paper P <b> 1 discharged to the temporary storage tray 310 to be sandwiched between the sandwiching members 510.

  FIG. 11 is a flowchart illustrating control in which the control circuit 182 selects the distance by which the retraction mechanism 410 moves the paper P backward. As shown in FIG. 11, when a series of controls is started, the control circuit 182 is transported to the post-processing unit 300 based on the output of the image detection device 160 in step S110 as the first step. It is determined whether the received paper P is abnormal paper P2. When it is determined that the paper P conveyed to the post-processing unit 300 is the abnormal paper P2, the process proceeds to step S120, and the paper P conveyed to the post-processing unit 300 is the abnormal paper P2. If it is determined that there is no sheet (normal sheet P1), the process proceeds to step S130.

  In step S130, the control circuit 182 determines the distance by which the paper P (normal paper P1) is moved backward by the retraction mechanism 410, the distance at which the rear end Pr of the normal paper P1 contacts the rear wall 314 (hereinafter referred to as “normal distance”). )).

  In step S <b> 120, the control circuit 182 determines whether there is a sheet P in the discharge tray 340 based on the output of the second sheet detection device 320. If it is determined that there is paper in the discharge tray 340, the process proceeds to step S140. If it is determined that there is no paper in the discharge tray 340, the process proceeds to step S150.

  In step S140, the control circuit 182 sets the distance for retreating the paper P (abnormal paper P2) by the retreat mechanism 410 to be shorter than the normal distance that is the distance determined in step S130. The distance determined in step S140 is determined so that the leading end portion Pt of the abnormal paper P2 protrudes from the leading end portion Pt of the normal paper P1 in the stacked state (see FIG. 4).

  In step S150, the control circuit 182 sets the distance by which the paper P (abnormal paper P2) is retreated by the retreat mechanism 410 to be shorter than the short distance defined in step S140. The distance determined in step S140 is set to a distance that the paper P (abnormal paper P2) moves from the temporary storage tray 310 to the discharge tray 340 so as to slide down the upward surface of the paper support 360.

  As described above, the present invention can be applied to an image forming apparatus such as a copying machine, a facsimile machine, and a printer.

DESCRIPTION OF SYMBOLS 10 ... Image forming apparatus 110 ... Image forming part 160 ... Image detection apparatus 182 ... Control circuit 300 ... Post-processing unit 310 ... Temporary storage tray 330 ... Post-processing apparatus 340 .... Discharge tray 390 ... Arrangement mechanism 400 ... Movement mechanism 500 ... Movement suppression mechanism 510 ... Pinching member

Claims (11)

An image forming unit for forming an image on a recording medium;
A first discharge unit from which the recording medium formed by the image forming unit is temporarily discharged;
A post-processing device that performs post-processing on the recording medium discharged to the first discharge unit;
A second discharge unit for discharging the recording medium subjected to post-processing by the post-processing device;
An arrangement mechanism for arranging the recording medium such that the recording medium in which image formation is normal and the recording medium in which image formation is not normal are arranged at different positions on the first discharge unit. When,
An image forming apparatus.   The arrangement mechanism includes a movement suppression mechanism that suppresses movement of the recording medium in a state in which image formation is normally performed and discharged to the first discharge unit on the first discharge unit. Image forming apparatus. The movement suppression mechanism has a sandwiching member that sandwiches the recording medium from both sides in the direction intersecting the moving direction of the recording medium,
The image forming apparatus according to claim 2, wherein the sandwiching member sandwiches a recording medium that has been discharged to the first discharge unit and has been normally formed.   4. The image according to claim 3, wherein the sandwiching member sandwiches the recording medium on which image formation has been normally performed only when the recording medium on which image formation has been normally performed has already been discharged to the first discharge section. Forming equipment. The sandwiching member is
Support the recording medium on which image formation has not been performed normally from below in the direction of gravity,
After the number of recording media supported from the lower side in the direction of gravity has reached a predetermined number, the recording medium in which image formation has been normally performed is sandwiched. The image forming apparatus according to claim 3, wherein the image forming apparatus is not performed.   The image forming apparatus according to claim 1, wherein the arrangement mechanism includes a moving mechanism that moves a recording medium, on which image formation is not normally performed, to move backward on the first discharge unit.   When there is a recording medium that has been post-processed in the second discharge unit, the moving mechanism performs image formation so that a recording medium that has not been image-formed normally remains in the first discharge unit. The image forming apparatus according to claim 6, wherein a recording medium that has not been normally moved is moved.   The moving mechanism allows the image formation so that the end of the recording medium where the image formation is not normally performed protrudes from the end of the recording medium where the image formation is normal and stacked. The image forming apparatus according to claim 6, wherein the recording medium that has not been made normal is retracted.   The post-processing device is configured to perform normal image formation among a recording medium in which image formation has been performed normally and a recording medium in which image formation has not been performed normally. 9. The recording medium according to claim 1, wherein the recording medium can be post-processed, and the recording medium on which image formation has not been normally performed is disposed at a position where the post-processing cannot be performed. Image forming apparatus.   Notification of notifying that the recording medium that has not been normally formed is discharged to the first discharge unit when the recording medium that has not been normally formed is discharged to the first discharge unit The image forming apparatus according to claim 1, further comprising a unit. The image forming unit includes:
When the recording medium that has not been normally formed in the first discharge is discharged, the image formation is stopped,
The image forming apparatus according to claim 1, wherein the image forming is resumed after waiting for an instruction from an operator.

Images