JP5417985B2 - Paper post-processing apparatus and image forming system - Google Patents

Description

  The present invention relates to a sheet post-processing apparatus and an image forming system for sheets discharged by an image forming apparatus.

  2. Description of the Related Art Conventionally, there is known a sheet storage device that stacks and stores sheets discharged one by one from an image forming apparatus main body (see, for example, Patent Document 1). In Patent Document 1, in a paper storage device that sequentially stacks and stores sheets discharged from the image forming apparatus main body one by one, a stacking base for stacking and storing the sheets, and a drive for raising and lowering the stacking base Means, detection means for generating a detection signal when the upper surface of the paper stored in the loading table reaches a predetermined height, and control means for lowering the loading table based on the detection signal from the detection means; A counting means for counting the number of sheets stored in the loading table; and when the detection means counts a predetermined number of sheets when no detection signal is generated from the detecting means, the position of the loading table is not correct. An invention of a sheet storage device is provided that includes a determination unit that determines appropriateness (see Patent Document 1 and Claim 1 of the scope of claims).

  The apparatus described in Patent Document 1 grasps the position information of the loading table by counting the number of sheets of paper and uses it for internal operation processing. The function of displaying the number of sheets of paper on the stacker cart is Nothing is disclosed.

  Patent Document 2 describes an invention of an image forming system. More specifically, an image forming apparatus includes a sheet post-processing apparatus that performs predetermined post-processing on a sheet material discharged from the image forming apparatus, and a sheet bundle storage apparatus that stores a sheet bundle post-processed by the sheet post-processing apparatus. In an image forming system in which a system can be constructed by selectively connecting to an apparatus, a first count unit that counts the number of sheets stored in the sheet bundle storage device and the sheet post-processing device Second counting means for counting the number of sheets being added, the first count value counted by the first counting means, and the second count value counted by the second counting means are added. Determining means for comparing the count value with the storage limit number set in the sheet bundle storage device to determine an overloading state of the sheet bundle storage device; An image forming system including a control unit that stops an image forming operation of the image forming apparatus based on a determination result by the determination unit is described (Patent Document 2 and Claims). 1).

  In the system described in Patent Document 2, the internal counter value is not displayed on an external carriage or the like, and there is a problem that it is not convenient for the user.

  Patent Document 3 discloses an invention of an image forming apparatus. More specifically, since the remaining amount of paper is detected in multiple stages when the device is turned on or when the paper cassette is reset, the bottom plate in the paper cassette has a lower limit position and an upper limit position. A bottom plate detection switch that detects whether the bottom plate is in the specified position. If the bottom plate detection switch detects that the bottom plate is in the specified position, The bottom plate is raised while detecting the amount, and if the bottom plate detection switch does not turn off during the rise and the paper surface detection sensor detects the uppermost surface of the paper, the bottom plate is stopped rising, and the printer goes to the print standby state and print operation. When the bottom plate detection switch is turned off, the number of fed sheets is counted every time the sheet is fed, and the remaining amount of the sheet is estimated when the count value reaches a preset value. In Patent Document 3, several types of setting values are prepared and the remaining amount of paper is detected in multiple stages.

  However, the conventional invention aims to operate the sheet post-processing apparatus normally, and the information on the number of sheets discharged to the stacking tray of the stacker is only in the sheet post-processing apparatus. Depending on the usage environment of the user of the stacker, some stackers have a plurality of loading carts. Also, if the paper loading cart is pulled out of the stacker and placed in another location, can the conventional cart know the paper information such as the number of paper sheets, the number of sorted paper copies, the number of paper sheets in the number of copies, and the paper type? Even if it is known when it is pulled out, this information becomes unclear over time. For this reason, depending on the user, it takes time to recount a large amount of discharged paper, and the work efficiency is reduced.

  The present invention has been made in consideration of the above-described situation, and information on sheets such as the number of sheets discharged from the main body of the image forming apparatus is completely separated from the sheet post-processing apparatus. An object of the present invention is to provide a sheet post-processing apparatus that can be grasped only by looking at a cart loaded with sheets even if the sheet is placed at a place.

In order to solve the above problems, the following means (1) to (8) are provided.
(1) A stacking tray that stacks sheets discharged from the image forming apparatus and that can be moved up and down by an elevating unit, a sheet detecting unit that detects sheets stacked on the stacking tray, and a detection result of the sheet detecting unit A sheet post-processing apparatus having sheet detection output means for outputting, and a carriage that receives the stacking tray at its lower limit position and is separable together with the stacking tray loaded with sheets. Display means for displaying the number of ejected sheets, and sheet detection input means for displaying the number of copies of sheets ejected from the image forming apparatus and the count value of the number of sheets on the display means, The carriage can display the number of copies of the sheet discharged from the image forming apparatus and the count value of the number of sheets after the separation from the sheet post-processing apparatus. Said display means, said carriage separated from the sheet post-processing device is disposed at a predetermined position in the sheet post-processing apparatus, the presence or absence of paper on the stacking tray is detected, no paper sheet is detected And the count of the number of sheets and the count value of the number of sheets are reset by the sheet detection input unit via an output from the sheet detection output unit.
(2) In the paper post-processing apparatus according to (1), transmission / reception of paper number information between the paper post-processing apparatus and the carriage is performed by optical coupling.
(3) In the paper post-processing apparatus according to (1), transmission / reception of paper number information between the paper post-processing apparatus and the carriage is performed wirelessly.
(4) In the sheet post-processing apparatus according to (1), transmission / reception of sheet number information between the sheet post-processing apparatus and the carriage is performed by magnetic coupling.
(5) In the paper post-processing apparatus according to any one of (1) to (4), the display unit of the carriage is provided with a function of displaying at the height of the number of papers corresponding to the paper type. It is characterized by.
(6) In the paper post-processing device according to any one of (1) to (4), the height of the number of papers corresponding to the paper type is displayed at a visible position of a carriage installation portion of the paper post-processing device. A display means is provided.
(7) In the paper post-processing apparatus according to any one of (1) to (6), the carriage has a weight measuring unit, and based on the measurement of the paper weight from the weight measuring unit, the paper The number of sheets for each type is calculated and displayed.
(8) In an image forming system including a paper post-processing device and an image forming device, the paper post-processing device is the paper post-processing device according to any one of claims 1 to 7. To do.

  According to the present invention, even when a carriage is placed away from the paper post-processing apparatus, the user can grasp the paper information such as the number of sheets discharged from the image forming apparatus main body at a glance by looking at the carriage. A processing apparatus and an image forming system including such a sheet post-processing apparatus and an image forming apparatus can be provided.

1 is a diagram illustrating a schematic configuration example of a copying system including a sheet post-processing device (stacker) and an image forming apparatus main body. 1A and 1B show an example of a schematic configuration of a sheet post-processing apparatus, in which FIG. 3A shows an example of an acceptance state of a sheet, and FIG. It is. (A) is a figure which shows the example of the state which has not loaded the paper of a trolley | bogie, (B) is a figure which shows the example of the state which loaded 5000 sheets of paper on the trolley | bogie, (C) is the figure of the loading of a trolley | bogie. It is the figure which looked at the state which loaded the paper on the tray from the side, and is an example which showed the number of copies, the number of sheets in the number of copies, and the total number of sheets, and (D) shows the high number of sheets corresponding to the paper type on the carriage. It is a figure which shows the example displayed by now. FIG. 3 is a block diagram illustrating a hardware configuration example of a paper post-processing device (paper stacking device). It is an example figure for demonstrating implementation operation example 8. FIG.

  Embodiments of the sheet post-processing apparatus of the present invention will be described below with reference to the drawings. In the following embodiment, a sheet stacking apparatus will be described as an example of the sheet post-processing apparatus, but the present invention is not limited to this.

  FIG. 1 is a schematic configuration example of a copying system provided with a sheet stacking device (stacker) B and an image forming apparatus A according to an embodiment of the present invention. FIG. 2 shows a schematic configuration example of the paper stacking apparatus B. 2A shows a state in which the paper P is received, and FIG. 2B shows a state in which the paper I to be described later can be taken out from the apparatus after the paper P is loaded and JOB is completed. It is.

  The paper P transported from the image forming apparatus A (image forming apparatus main body) to the paper stacking apparatus B is transported and discharged to the paper stacking section by the transport rollers 1 to 4 and stacked. The sheet stacking unit includes an upper sheet stacking unit C and a large-volume stacking unit D (main stacking unit), and the discharge of the sheet P is switched when the branching claw 5 in the transport path operates. A stacking tray 6 for stacking discharged paper P and a stacking tray 6 are placed on the large-volume stacking unit D, and are moved up and down by tray lifting / lowering means (shown as constituent blocks in FIG. 4). The elevating frame 7 for moving the tray 6 up and down, and when the elevating frame 7 reaches the lower limit due to the end of JOB, the elevating frame 7 and the stacking tray 6 are separated by receiving the stacking tray 6 and the stacking tray 6 in a state where the sheets P are stacked. Each has a carriage I for taking out from the apparatus. The image forming apparatus includes an optical scanning unit that performs image formation (latent image formation) on a sheet P on an image carrier (photosensitive member) by electrophotography, and a developing unit that develops the formed latent image with toner. And a transfer means for temporarily transferring the toner image formed by development and transferring it onto the paper P, and a fixing means for permanently fixing the image transferred onto the paper P. The image forming apparatus includes a charging unit that uniformly charges before forming a latent image on the photoconductor, and further removes toner remaining on the photoconductor after transfer by the transfer unit, or by the transfer unit. A cleaning unit for removing toner remaining after the transfer to the paper P may be provided.

  Further, a paper surface detection sensor 8 is provided so that the height of the stacking tray 6 (paper receiving height) is substantially constant in order to stack the discharged paper P satisfactorily. Furthermore, in order to improve the stacking state, a paper alignment unit (jogger unit) (not shown) can be provided in the paper discharge unit.

  FIG. 4 is a block diagram illustrating a hardware configuration example of the paper post-processing device (paper stacking device). The main control plate F of the sheet post-processing apparatus can communicate with the control unit 10 of the image forming apparatus (image forming apparatus main body) A via a bus or the like, and includes a CPU (Central Processing Unit) 11 and a sheet stacking apparatus. A ROM (Read-Only Memory) 12 storing an application for executing each operation of B and the like and a sheet detection output means E are configured.

  When paper conveyance is detected by the paper surface detection means 1C and paper surface detection means 2C in FIG. 4, the signal is transmitted directly to the paper detection output means E via the CPU 11 or without going through the CPU 11. A signal is received from the paper surface detection means 2C, and based on this reception, the paper detection output means E (for example, using an LED (Light Emitting Diode)) emits light. The carriage I has a power source J composed of a battery and the like, and a paper detection input means G composed of a photodiode and the like, and the carriage I and the paper stacking device B can communicate wirelessly.

[Example of operation 1]
In the implementation example 1, the sheet post-processing device (paper stacking device) has a block configuration shown in the block diagram of FIG.

  The image forming apparatus main body A operates, and the sheet P on which an image is formed is inserted from the sheet feeding roller 1 of the sheet stacking apparatus B shown in FIG. The inserted paper P is sorted by the branching claw 5 based on the information on whether the paper is delivered to the carriage I transmitted from the control unit 10 of the image forming apparatus A to the CPU 11 of the paper stacking apparatus B.

  In the paper stacking apparatus B, based on information from the main body of the image forming apparatus A, if the paper P is to be stacked on the stacking tray 6, the branching claw 5 is instructed to deliver the paper P to the stacking tray 6 side. Thus, the paper surface of the paper P that has passed through the conveying roller 4 is detected by the paper surface detection means 2C. As described above, when paper conveyance is detected by the paper surface detection means 2C, the signal is transmitted directly to the paper detection output means E in the paper post-processing apparatus B via the CPU 11 or without passing through the CPU 11. On the other hand, the paper transported to the upper paper stacking section C is detected by the paper detecting means 3C after passing through the transport rollers 2 and 3 by the branch claw 5 and delivered to the upper paper stacking section C. When the paper surface detection means 1C detects the paper conveyance, the signal is determined not to be the paper P via the CPU 11, and is not transmitted to the paper detection output means E.

  When the paper detection input means G in the carriage I receives the signal of the paper P from the paper detection output means E, for example, it sends a signal to the display means H, and the display means H counts up by +1 for each additional sheet. The number of sheets information is displayed. When the paper discharge is completed and the carriage I is separated and pulled out from the paper post-processing apparatus B, the counter value on the display means H displays the number of sheets, and the carriage I has a power source J such as a battery. Therefore, the user can grasp the number of sheets on the stacking tray by looking at the display means H of the carriage I as shown in FIG.

  In this embodiment, the configuration as described above enables the number of sheets to be grasped even after the carriage is pulled out from the sheet post-processing apparatus. Accordingly, even when the carriage I on which the stacking tray is placed is placed at a position away from the sheet post-processing apparatus B, the number of sheets stacked on the carriage I can be accurately grasped. If such a paper post-processing device is used, the cart loaded with the stacking tray is pulled out separately from the paper post-processing device, and the cart is loaded on the cart even when the cart is placed at a position away from the paper post-processing device. Since the number of printed sheets can be easily grasped, the number of sheets printed and discharged by the user can be easily confirmed, which is easy to use.

[Example of operation 2]
In the second operation example, the number of copies (number of copies count value) for sorting sheets stacked on the stacking tray from the sheet post-processing apparatus B, and the sheet count value of the number of copies obtained by counting the number of sheets of each copy, are used. When the paper discharge is completed, the above-mentioned copy count value and the paper count value within the copy are transmitted to the carriage I by using the paper detection output means E (LED: Light Emitting Diode) of the paper post-processing apparatus B. Can be set as follows. In the carriage I, the sheet detection input means G (such as a phototransistor) receives the above-mentioned copy count value and the sheet count value within the number of copies so that the number of copies and the number of sheets can be displayed on the display means H of the carriage I. Yes.

  In this example of operation, an example is described in which signals are transmitted and received after the paper is discharged. However, the paper detection output means E (LED) of the paper post-processing device is used when discharging a single sheet or the number of copies. You may enable it to set so that the signal transmission to the trolley | bogie I may be performed at the time of every discharge | emission.

  In this example of operation, as shown in FIG. 3C, the carriage displays the number of copies and the sheet count of the number of copies, and even after the carriage is pulled out from the sheet post-processing device, the number of copies and the number of sheets of each copy are displayed. Can be displayed. Accordingly, even when the carriage I on which the loading tray is placed is placed at a place separated from the paper post-processing apparatus B, the number of sheets stacked on the carriage I and the number of sheets of each number can be easily confirmed and grasped. be able to.

  If such a paper post-processing device is used, since the cart displays the number of copies and the paper count of the number of copies, the cart is pulled out from the paper post-processing device, and the cart is placed at a position away from the paper post-processing device. Even in this case, the user can grasp the number of printed and ejected copies and the number of sheets of each copy, and can use a convenient sheet post-processing apparatus.

[Example of operation 3]
The operation example 3 is an operation example in a state where the carriage I on which the stacking tray 6 is placed is outside the sheet post-processing apparatus B. In this operation example, all of the sheets are moved from the stacking tray 6, and the carriage I is set at a predetermined position in the sheet post-processing apparatus B with no sheet on the loading tray 6 of the carriage I. (See the difference in the position of the carriage in FIG. 2B from the position in FIG. 2A). It is assumed that the counter value of the carriage I at this time is displayed as it is before the sheet is moved. For example, if the position of the carriage I shown in FIG. 2A is a predetermined position, the carriage I is placed at a predetermined position of the sheet post-processing apparatus main body, as shown in FIG. A reset instruction signal is output from the CPU 11 in the B main control board F to the cart display means. This signal is inputted to the paper detection input means G of the carriage I through the paper detection output means E, and the paper detection input means G to which the signal is inputted performs zero reset on the display means H of the carriage I.

  That is, when the carriage I is set at a predetermined position in the sheet post-processing apparatus B, the sheet post-processing apparatus B detects the presence or absence of sheets on the stacking tray 6. This detection can be performed using optical detection means. If it is determined that there is no paper as a result of the detection, the display unit on the carriage I is automatically reset to zero. Since the zero reset is automatically performed in this way, the sheet post-processing apparatus B that is user-friendly and excellent in operability is used.

  In this example of operation, when the cart pulled out from the paper post-processing device is set at a predetermined position in the paper post-processing device, the counter value of the cart can be reset. Accordingly, when the carriage on which the stacking tray is placed is set at a predetermined position in the paper post-processing device, the paper post-processing device detects the presence of paper and determines that there is no paper. In contrast, since the zero reset is automatically performed, the sheet post-processing apparatus has excellent operability.

  If such a paper post-processing device is used, the carriage on which the stacking tray is placed is set at a predetermined position in the paper post-processing device, and the paper post-processing device detects the presence of paper and determines that there is no paper. Since the zero reset is automatically performed on the display unit on the carriage, it is possible to omit the counter reset performed each time on the user side, and it is possible to use a sheet post-processing apparatus with excellent operability.

[Example of operation 4]
The operation example 4 employs a configuration in which the discharge information of each sheet is exchanged by optical coupling (Opto-Coupling). This optical coupling may be IR (infrared (including laser)) communication or visible light laser communication, and information may be transmitted using an optical coupler including an LED and a light receiving element. There is no mechanical coupling between the sheet post-processing apparatus B and the carriage I (for example, the cable and connector for inserting and receiving signals), and the carriage I can be smoothly inserted and removed from the sheet post-processing apparatus B.

  In this example of operation, optical coupling is adopted as a method for exchanging information about the number of sheets between the sheet post-processing apparatus and the carriage. Accordingly, since the exchange of information is performed by optical coupling, the mechanical coupling between the paper post-processing device and the carriage can be omitted, and therefore, the carriage can be smoothly inserted and removed from the paper post-processing device. In addition, since the information can be exchanged with a simple configuration, the product cost can be suppressed.

[Exemplary Operation Example 5]
In the operation example 5, the discharged paper information such as the number of sheets, the number of copies, and the like is transmitted and received by the paper post-processing device B as a wireless master device and the carriage I as a wireless slave device. Alternatively, when the sheet post-processing apparatus B becomes a host (master) and an actuator (driving device) is mounted on the carriage I, the carriage I can be set on the sheet post-processing apparatus B wirelessly. Since there is no mechanical coupling between the sheet post-processing apparatus B and the carriage I (the same as described above), the carriage I can be smoothly inserted and removed from the sheet post-processing apparatus B.

  In this example of operation, the paper number information between the paper post-processing device and the carriage is wirelessly coupled. Therefore, since the paper post-processing device is a wireless master unit and the cart is a wireless slave unit, there is no mechanical connection between the paper post-processing device and the cart, so that the carriage can be smoothly inserted and removed from the paper post-processing device. Can be done.

[Example of operation 6]
In the sixth operation example, a magnetic force generation device such as a magnet or an electromagnet is mounted on the paper post-processing device B for exchanging (discharging) information of each paper, and a magnetic detection element is installed on the carriage I side. It is comprised so that it may have. In this embodiment, a configuration opposite to that described above is possible. As a result, the paper discharge information can be exchanged by magnetic information. With this configuration, there is no mechanical connection between the sheet post-processing apparatus B and the carriage I, and the carriage I can be smoothly inserted and removed from the sheet post-processing apparatus B.

  In this example of operation, the paper number information of the paper post-processing apparatus B and the carriage I is coupled by magnetic coupling. Accordingly, the information exchange is performed by mounting a magnet, an electromagnet, or the like on the paper post-processing device B, and the carriage I side serves as a magnetic detection element, so there is no mechanical coupling between the paper post-processing device and the cart. It can be done smoothly, such as putting in and out of the trolley.

[Execution example 7]
In the operation example 7, the configuration in which the height of the number of sheets corresponding to the sheet type is displayed on the carriage I is adopted. An example is shown in FIG. For example, on the left side of the handle portion of the carriage I, the scale for displaying the number of sheets with respect to the height of the paper A is provided as a dotted line for 500 sheets, and as a solid line for 1000 sheets. On the right side of the handle portion of the carriage I, a scale for displaying the number of sheets with respect to the height of the paper B is provided as a dotted line for 500 sheets, and as a solid line for 1000 sheets. With this configuration, the number of sheets for each sheet can be ascertained, the counter mounted on the carriage I can be omitted, and the approximate number of sheets can be immediately grasped without a sheet stacking number counter.

  In this example of operation, the height of the number of sheets corresponding to the sheet type can be displayed on the carriage. Therefore, when it is desired to grasp the outline of the number of sheets, the number of sheets can be grasped without looking at the counter value mounted on the carriage.

[Example of operation 8]
FIG. 5 is an example diagram for explaining an implementation operation example 8. In FIG. As shown in FIG. 5, a scale, which is a display unit for displaying the number of sheets corresponding to the sheet type in height, is provided outside the sheet post-processing apparatus B and at a position directly beside the carriage I installation unit. Thereby, when pulling out the cart I with the stacking tray 6 from the paper post-processing apparatus B, the outline of the number of sheets can be grasped at a glance. Even when the carriage I is located away from the sheet post-processing apparatus B, the outline of the number of sheets can be grasped only by moving it to a predetermined position in the sheet post-processing apparatus B. In addition, you may make it have a scale etc. inside the paper post-processing apparatus B. FIG.

  In this embodiment operation example, in addition to the above-described embodiment operation example, the height of the number of sheets corresponding to the sheet type is displayed in the lateral position of the carriage installation unit in the sheet post-processing apparatus. When pulling out the cart with the tray, you can see at a glance the approximate number of sheets.

[Example of operation 9]
In the operation example 9, the carriage I is provided with a measuring unit that measures the paper weight. A carriage I loaded with trays is equipped with a weighing scale which is a weighing means for measuring the weight of the loaded tray 6 and discharged paper. By measuring the weight with the weigh scale, for example, the weight per sheet is stored for each sheet type, so when the sheet type is entered, it is automatically calculated internally, and the number of stacked sheets as a result is It can be displayed on the display means H of the carriage I. In this case, the range of the number of sheets (a range in consideration of variations in the number of sheets: for example, “A ± 3 sheets”) can be displayed at the same time.

  In this example of operation, the carriage has means for measuring the paper weight, and can calculate and display the number of sheets for each paper type from the paper weight result. Accordingly, since the number of sheets can be calculated from the tray loaded on the carriage, the sheet weight, and the weight per sheet, it is possible to omit the exchange of signals with the sheet post-processing device regarding the number of sheets. The processing of the paper post-processing device can be reduced.

  In the present invention, an invention in which two or more of the above operation examples are arbitrarily combined is also included in the present invention. For example, in the paper post-processing apparatus, information such as a predetermined number of documents collected by a stapler and the number of copies of the set is displayed on the display means H shown in FIG. 3C, and in FIG. The total number of sheets is indicated at the indicated display means H, and as shown in FIG. 3 (D) or FIG. 5, a configuration having display means in the sheet post-processing apparatus main body and the carriage I can be freely selected. .

  Further, regarding the operation examples 8 to 9, the hardware configuration of the paper post-processing device (paper stacking device) shown in FIG. 4 can be used, but the hardware configuration of the carriage I shown in FIG. 4 may be omitted. it can. In other implementation examples, the hardware configuration shown in FIG. 4 can be adopted. This is the same configuration in the case of the combination of the implementation operation examples 8 to 9 and other implementation operation examples.

  Further, in the present invention, the carriage I may be configured to have an MPU or the like so that simple calculation or processing can be performed. Further, it can be appropriately installed at the tip of the carriage I so that optical coupling, magnetic coupling and the like can be performed.

1C Paper surface detection means (paper surface detection sensor)
2C Paper surface detection means (paper surface detection sensor)
3C Paper detection means (conveyance sensor)
5M Drive motor 1-4 Conveyance roller (conveyance roller)
5 nails (branched nails)
6 Loading tray 7 Elevating frame 10 Control unit of image forming apparatus 11 CPU (Central Processing Unit) of sheet stacking apparatus
12 ROM (Read Only Memory)
13, 14 Forward / reverse driver A Image forming device B Paper post-processing device (paper stacking device)
C Upper stacking section of paper stacking device D Mass stacking section E Paper detection output means G Paper detection input means H, H 'Display means (display means for carriage I)
H1 display means (paper post-processing device body)
I Cart J Power supply (battery)
P Paper loaded on the carriage U Tray lifting means

Japanese Patent Laid-Open No. 03-216455 Japanese Patent Laid-Open No. 07-129038 JP 2000-016639 A

Claims (8)

A stacking tray that stacks sheets discharged from the image forming apparatus and that can be moved up and down by a lifting means;
Paper detection means for detecting paper loaded on the stacking tray;
Paper detection output means for outputting the detection result of the paper detection means;
In the paper post-processing apparatus, the carriage has a tray that receives the stacking tray at its lower limit position and is separable together with the stacking tray on which the sheets are stacked.
The carriage has a display unit that displays the number of sheets discharged from the image forming apparatus, and a sheet that displays the number of copies of the sheet discharged from the image forming apparatus and a count value of the number of sheets on the display unit. Detection input means,
The carriage is capable of displaying the number of copies of the sheet discharged from the image forming apparatus and the count value of the number of sheets after the separation from the sheet post-processing device.
The display means is configured such that the carriage separated from the paper post-processing device is disposed at a predetermined position in the paper post-processing device,
When the presence or absence of paper on the stacking tray is detected and no paper is detected,
The sheet post-processing apparatus, wherein the number of sheets and the count value of the number of sheets are reset by the sheet detection input unit via an output from the sheet detection output unit.   2. The sheet post-processing apparatus according to claim 1, wherein transmission / reception of sheet number information between the sheet post-processing apparatus and the carriage is performed by optical coupling.   The sheet post-processing apparatus according to claim 1, wherein the sheet post-processing apparatus and the carriage perform wireless transmission and reception of sheet number information.   The sheet post-processing apparatus according to claim 1, wherein the sheet post-processing apparatus and the carriage perform transmission and reception of sheet number information by magnetic coupling.   5. The sheet post-processing apparatus according to claim 1, wherein a function of displaying the number of sheets corresponding to a sheet type is added as the display unit of the carriage.   5. The post paper sheet according to claim 1, further comprising display means for displaying the height of the number of paper sheets corresponding to the paper type at a visible position of the carriage installation portion of the paper post-processing apparatus. Processing equipment. The carriage has a weight measuring means,
7. The sheet post-processing apparatus according to claim 1, wherein the number of sheets for each sheet type is calculated and displayed based on the sheet weight measurement from the weight measuring unit. In an image forming system comprising a paper post-processing device and an image forming device,
The image forming system according to claim 1, wherein the sheet post-processing apparatus is the sheet post-processing apparatus according to claim 1.

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