Sheet processing apparatus and image formation system

Abstract

To enable a current value of a motor to be corrected depending on environmental temperatures without requiring the installation space of an exclusive temperature sensor.SOLUTION: A sheet processing apparatus comprises: a conveyance member for conveying a sheet; a processing unit for executing prescribed processing to the conveyed sheet; an ejection part for ejecting the processed sheet; a conveyance motor for applying driving force to the conveyance member; a control board having a control unit for controlling a driving current which drives the conveyance motor; a conveyance motor driver for driving the conveyance motor provided at the control board; and a temperature detection unit for detecting the temperature of the control unit provided at the control board. The control unit executes control in such a manner that, when the temperature detected by the temperature detection unit exceeds a set threshold temperature, a driving current value to drive the conveyance motor is made lower than that when it is the threshold temperature or lower.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a sheet processing apparatus that performs a predetermined process on a sheet, and more particularly to a sheet processing apparatus that can accurately drive a motor that applies a driving force to a driven member such as a roller, and an image forming system equipped with the same. [Background technology]

[0002] In recent years, in addition to simply discharging sheets on which images have been formed by an image forming apparatus, sheet processing apparatuses that perform processes such as stapling and folding on the sheets on which images have been formed have come to be used in combination with the image forming apparatus.

[0003] In such a sheet processing apparatus, a motor drives a driven member such as a roller for conveying a sheet. The current value for driving this motor is set to a higher current value than that suitable for the apparatus in a normal temperature environment, in anticipation of the increased operating load of each mechanism of the apparatus in a low temperature environment.

[0004] However, when the device is operated continuously, the inside of the device heats up, and as a result, the operating load of each mechanism decreases. With respect to that operating load, the current value assumed for a low-temperature environment becomes a current value that causes the motor to generate excessive force, resulting in high motor power consumption.

[0005] Therefore, a commonly known control method is to place a sensor that detects the temperature inside the device near the motor and change the current value that drives the motor according to the temperature detected by the sensor (Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2016-175518 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, if a sensor that detects the ambient temperature is provided near the motor, it is necessary to place the sensor itself, as well as wiring connecting the sensor to a control board equipped with a CPU that receives the sensor output information and issues a control signal to the motor driver, within the device. This makes the configuration complex, particularly when it is necessary to miniaturize the device, in order to secure space to install a dedicated temperature sensor for detecting the ambient temperature.

[0008] The present invention has been made in consideration of the above-mentioned problems, and provides a sheet processing device and an image forming system equipped with the same that can correct the motor current value based on the ambient temperature without requiring installation space for a dedicated temperature sensor. [Means for solving the problem]

[0009] A typical configuration of the present invention for achieving the above-mentioned object includes a conveying member for conveying a sheet, a processing unit for performing a predetermined processing on the conveyed sheet, a discharge unit for discharging the processed sheet, a conveying motor for applying a driving force to the conveying member, a control board having a control unit for controlling a driving current for driving the conveying motor, a conveying motor driver provided on the control board for driving the conveying motor based on a driving current determined by the control unit, and a temperature detection unit provided on the control board for detecting the temperature of the control unit, wherein the control unit controls the driving current value for driving the conveying motor to be smaller when the temperature detected by the temperature detection unit exceeds a set threshold temperature than when the temperature is below the threshold temperature. Effect of the Invention

[0010] In the present invention, no installation space is required for a temperature sensor, and it is possible to detect the environmental temperature and control the drive current of the motor, thereby making it possible to miniaturize the device without complicating the device configuration. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of an overall configuration of an image forming system equipped with a sheet processing apparatus; [Diagram 2] FIG. [Diagram 3] FIG. 1 is a diagram illustrating the configuration of a sheet processing apparatus; [Figure 4] Control configuration block diagram of image forming system [Diagram 5] Drive current control configuration block diagram of the transport motor [Figure 6] Flowchart of motor drive current value control [Figure 7] Graph showing the relationship between CPU temperature and ambient temperature [Figure 8] Graph showing drive current value of conveyor motor [Figure 9] FIG. 1 is a plan view of a sheet processing apparatus; [Figure 10] Flowchart for controlling motor drive current in multiple stages [Figure 11] A temperature-current data table that sets the drive current value for states 1 to 6 according to the environmental temperature. [Figure 12] Graph showing drive current value of conveyor motor DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] [First embodiment] Next, a sheet processing apparatus according to a preferred embodiment of the present invention and an image forming system including the same will be described with reference to the drawings. Fig. 1 shows a schematic diagram of the overall configuration of an image forming system including a sheet processing apparatus according to an embodiment of the present invention. As shown in the figure, an image forming system C is composed of an image forming apparatus A and a sheet processing apparatus B attached thereto.

[0013] <Image forming device> The image forming apparatus A is made up of an image forming unit A1, a scanner unit A2, and a feeder unit A3. The image forming unit A1 includes a feeding section 2, an image forming section 3, and a discharge section 4 inside a device housing 1.

[0014] The feeding section 2 is composed of multiple cassette mechanisms 2a, 2b, and 2c that store image formation sheets of different sizes, and feeds sheets of a size specified by the main body control unit to a feeding path 2f. Each cassette mechanism 2a, 2b, and 2c is installed detachably from the feeding section 2, and each has a built-in separation mechanism that separates the internal sheets one by one and a feeding mechanism that feeds the sheets. The feeding path 2f is provided with a conveying roller that feeds the sheets supplied from each cassette mechanism 2a, 2b, and 2c downstream, and a pair of registration rollers at the end of the path that aligns the leading edge of each sheet.

[0015] In this embodiment, the image forming unit 3 is configured using an electrophotographic system, and includes a rotating photosensitive drum 3a, a charging roller 3b, an exposure device 3c, a developing device 3d, and a cleaner (not shown) arranged around the photosensitive drum 3a. What is shown in the figure is a color printing mechanism, and the image forming mechanisms are provided for each color of yellow (Y), magenta (M), cyan (C), and black (K).

[0016] In forming an image, the peripheral surface of the rotating photosensitive drum 3a is uniformly charged by the charging roller 3b, and the exposure device 3c irradiates light according to an image signal to form an electrostatic latent image, which is then developed by the developing device 3d to form a toner image. The toner images of each color thus formed are primarily transferred to the rotating intermediate transfer belt 3e to form a color image, and the sheet is fed from the feeding path 2f to the secondary transfer section in accordance with the timing of this image formation, and the toner image formed on the intermediate transfer belt 3d is transferred onto the sheet by applying a transfer bias from the secondary transfer roller 3f. The sheet with the transferred toner image is heated and pressurized as it passes through the fixing device 5 to fix the toner image, and is discharged from the discharge port 4b by the discharge roller 4a and transported to the sheet processing device B described later.

[0017] The scanner unit A2 includes a platen 6a on which an image original is placed, a carriage 6b that reciprocates along the platen 6a, a photoelectric conversion element 6c, and a reduction optical system 6d that guides reflected light from the original on the platen 6a by the carriage 6b to the photoelectric conversion element 6c. The photoelectric conversion element 6c photoelectrically converts the optical output from the reduction optical system 6d into image data and outputs it as an electrical signal to the image forming section 3. The scanner unit A2 is also capable of reading original sheets fed from the feeder unit A3.

[0018] <Sheet processing device> Next, the overall configuration of the sheet processing apparatus B that processes the sheets sent from the image forming apparatus A will be described.

[0019] Fig. 2 is a perspective view of the sheet processing apparatus according to this embodiment, and Fig. 3 is an explanatory diagram of the configuration of sheet processing apparatus B. Sheet processing apparatus B includes an apparatus housing 11 having an inlet 10 for introducing a sheet from image forming apparatus A. The apparatus housing 11 is positioned in alignment with the housing 1 of image forming apparatus A so that the inlet 10 communicates with the discharge outlet 4b of image forming apparatus A.

[0020] The discharge section 4 of the image forming apparatus A of this embodiment is formed in a space (internal space) formed between the image forming unit A1 and the scanner unit A2, and the sheet processing apparatus B is disposed in the space.

[0021] The sheet processing device B is composed of a device frame 11, a sheet transport path 12 arranged in the device frame 11, a processing tray 14 arranged downstream of the transport path exit 13, and a stack tray 15 arranged further downstream. As shown in Fig. 2, a staple cartridge installation opening 16, a manual insertion setting section 17, and a manual operation button 18 are provided on the front side of the device frame 11.

[0022] The processing tray 14 is also provided with a pick-up paddle 19 made of a rubber plate that picks up sheets into a trailing end stopper 21, a knurled rubber belt 20 with a knurled outer periphery, and a sheet trailing end stopper 21 that accumulates sheets in a bundle, and an alignment plate 22. The processing tray 14 is also provided with a staple binding unit 23 that staples the sheet bundle, and a stapleless binding unit 24 that staples the sheet bundle without staples.

[0023] A sheet on which an image is formed by the image forming apparatus A is sent from the discharge port 4b of the image forming apparatus to the receiving port 10 of the sheet processing apparatus B. The sheet is transported by a transport roller 30a, which is a sheet transport member provided in the sheet transport path 12, and is transported to a processing tray 14 by a transport roller 30b, which is a sheet transport member provided in the vicinity of the transport path exit 13.

[0024] The sheet transported from the transport path exit 13 to the processing tray 14 is scraped off by a scraping paddle 19 rotating counterclockwise in FIG. 3, and is transported by a knurled belt 20 rotating counterclockwise in FIG. 3 so that the rear end of the sheet abuts against a sheet rear end stopper 21, and both widthwise sides of the sheet are aligned by sliding an alignment plate 22 in the sheet width direction.

[0025] After a predetermined number of sheets are conveyed to the processing tray 14 as described above, the staple binding unit 23, which is a processing section, is operated to perform a binding process on the sheet stack on the processing tray 14. When the sheets are stapled, one of the pair of discharge rollers 31, 31 that has been separated as shown by the solid line in Fig. 3 moves as shown by the dashed line in Fig. 3 to nip the sheets on the processing tray 14. The sheets are then discharged by the discharge roller 31 that is rotated by the drive of the discharge motor, and are stacked and stored on the stack tray 15. This stack tray 15 is equipped with a tray lifting mechanism that sequentially moves down according to the amount of sheets stacked.

[0026] <Control Unit> Next, the control configuration of the image forming system will be described with reference to the block diagram of FIG.

[0027] The image forming system of this embodiment includes an image forming control unit 200 of image forming apparatus A and a sheet processing apparatus control unit (CPU: also called MPU, that is, it refers to not only the part that performs calculations but also the calculation functions of the CPU integrated on a chip) 100 of sheet processing apparatus B. The image forming control unit 200 includes a sheet feeding control unit 201 and an input unit 202. A control panel 203 provided on this input unit 202 is used to set the "print mode" and "sheet processing mode."

[0028] The sheet processing apparatus control unit 100 operates the sheet processing apparatus B according to the sheet processing mode. The sheet processing apparatus control unit 100 includes a ROM that stores an operation program and a RAM that stores control data. In addition, the sheet processing apparatus control unit 100 receives signals from a stack tray loading limit sensor 102 that detects the lower limit position of the stack tray 15, an entrance sensor 103 that detects the sheet on the conveying path 12, and the like, from a various sensor input unit 101.

[0029] The sheet processing apparatus control unit 100 also includes a sheet conveying control unit 104 that controls the conveying motor 32 that applies a driving force to the conveying rollers 30a and 30b, the discharge motor 33 that applies a driving force to the discharge rollers 31, the paddle motor that operates the pick-up paddle 19, the knurling motor that operates the knurling belt 20, and the like. The sheet processing apparatus control unit 100 also includes a processing tray control unit 105 that controls the driving of an alignment motor that moves the alignment plate 22 that accumulates the sheets on the processing tray 14, and the like. The sheet processing apparatus control unit 100 also includes a staple binding control unit 106 that controls a staple binding unit moving motor 34 for moving the staple binding unit 23 that performs a staple process on the sheet stack on the processing tray 14 along the rear end stopper 21, a staple motor 35a for driving the staple binding unit 23, a stapleless binding motor 35b for driving the stapleless binding unit 24, and the like, and a stack tray lift control unit 107 that controls a stack tray lift motor 36 that lifts and lowers the stack tray 15, and the like.

[0030] <Drive current control> In the sheet processing apparatus B of this embodiment, the drive current of the motor that applies a driving force to the driven members such as the conveying rollers 30a and 30b is controlled in accordance with the environmental temperature of the apparatus. The control configuration for this purpose will be described here by taking as an example the drive current value control of the conveying motor 32 that drives the conveying rollers 30a and 30b.

[0031] 5 is a block diagram of the drive current control configuration of the conveying motor 32. As shown in the figure, a CPU that is the sheet processing apparatus control unit 100 is mounted on a control board 300. This sheet processing apparatus control unit 100 has a sheet conveyance control unit 104, and the sheet conveyance control unit 104 is equipped with a current value control unit 301 that controls the drive current of the conveying motor 32.

[0032] A conveying motor 32 is driven via a conveying motor driver 302 by the driving current controlled by the current value control unit 301, thereby controlling the rotation of the conveying rollers 30a and 30b.

[0033] A temperature detection unit 303 for detecting the CPU temperature is provided in the sheet processing apparatus control unit (CPU) 100. Specifically, a resistor is provided in the CPU (integrated circuit), and the CPU temperature is detected by detecting the resistance value when a predetermined current flows.

[0034] In the sheet processing apparatus B of this embodiment, the drive current value of the conveying motor 32 is controlled in accordance with the ambient temperature of the apparatus. The ambient temperature of the apparatus is detected by a temperature detection unit 303 provided in the CPU, and the current value control unit 301 controls the drive current value of the motor based on the detected temperature.

[0035] Specifically, as shown in the flowchart of Fig. 6, when driving the carry motor 32, the current value control unit 301 initially sets the current value for driving the carry motor 32 to a motor current value that can ensure torque in a low-temperature environment (for example, 0°C "state 1") (S1). Since a higher drive torque is required in a low-temperature environment than in a high-temperature environment, this prevents a torque shortage when the carry motor is driven at a drive current value for a low-temperature environment that is set to a higher drive current value than in a high-temperature environment when the device is started up and the environmental temperature is unknown.

[0036] Thereafter, the temperature of the CPU is detected at predetermined time intervals by a temperature detection unit 303 provided in the sheet processing apparatus control unit 100 (S2, S3). The CPU temperature is not the temperature of the apparatus environment, but the CPU generates heat by itself and also the conveyance motor driver 302 mounted on the same control board 300, and the temperature including these heats is detected by the temperature detection unit 303. Therefore, in this embodiment, as shown in Fig. 7, a temperature T1-(T2+T3) is calculated as an environmental temperature T4 by subtracting a self-heating temperature T2 of the CPU and an ambient heat temperature T3 due to heat generated by elements mounted on the control board such as the motor driver 302 from the CPU temperature T1 detected by the temperature detection unit 303 (S4).

[0037] A low temperature environment is designated as "State 1," and a high temperature environment is designated as "State 2," and the drive current value of the motor is set according to each state. Specifically, it is determined whether or not the environmental temperature exceeds a preset threshold temperature (S5), and when the environmental temperature is equal to or lower than the threshold temperature, the drive current value (first current value) for a low temperature environment (State 1) is set (S7). On the other hand, when the detected environmental temperature exceeds the threshold temperature, the drive current value (second current value) for a high temperature environment (State 2), i.e., a current value smaller than the drive current value for a low temperature environment, is set to drive the carry motor (S6).

[0038] In this embodiment, as shown in the graph of Fig. 8, the threshold temperature of the environmental temperature for switching the drive current value is set to 25°C, and when the environmental temperature is 25°C or less, it is a low temperature environment (state 1), and when it exceeds 25°C, it is a high temperature environment (state 2). To detect this by the CPU temperature, the environmental temperature is calculated by setting the temperature T2 that rises due to the self-heating temperature of the CPU when the device is running to 10°C, and the temperature T3 that rises due to the self-heating of elements mounted on the control board such as the motor driver 302 to 15°C. In other words, when the CPU temperature T1 detected by the temperature detection unit 303 is 50°C, the environmental temperature is calculated as 50-(10+15)=25°C.

[0039] Then, when the CPU temperature is 50° C., it is set as the threshold temperature of the detected CPU temperature. As a result, when the temperature detected by the temperature detection unit 303 is 50° C. or lower, it is determined that the environmental temperature is a low temperature environment (state 1), and the carry motor drive current value (first current value) at that time is set to 800 mA. On the other hand, when the temperature detected by the temperature detection unit 303 exceeds 50° C., it is determined that the environmental temperature is a high temperature environment (state 2), and the carry motor drive current value (second current value) at that time is set to 670 mA, which is lower than the low temperature environment.

[0040] In this embodiment, as shown in the graph of FIG. 8, the motor drive current value (graph A) set in states 1 and 2 is set to a value with some margin compared to the minimum current value (graph B) required to drive the motor depending on the ambient temperature.

[0041] As described above, by detecting the CPU temperature, it is possible to set a motor drive current value appropriate for the environmental conditions without providing a separate sensor for detecting the environmental temperature. This makes it possible to reduce the number of parts and make the device more compact without complicating the device configuration.

[0042] This is effective in an apparatus that is required to be compact, such as the sheet discharge section formed in the internal space of the image forming apparatus A as in this embodiment, and the sheet processing apparatus B that is arranged in this narrow space.

[0043] In this embodiment, as shown in FIG. 9, the control board 300 having the CPU mounted thereon is arranged at the rear side of the device body. Here, the front side of the device body is the side facing the device body when the user operates the image forming system, and the rear side of the device body is the opposite side to the front side, that is, the rear side of the device body when installed. The transport rollers 30a and 30b are arranged so that the rotation axis direction is the front-rear direction of the device body, the control board 300 is arranged at the rear side of the device body from the transport rollers 30a and 30b, and the transport motor 32 is also arranged at the rear side of the device body from the transport rollers 30a and 30b. This provides the effect of being able to obtain the temperature more stably than arranging the control board 300 at a place where people or objects move and temperature changes are likely to occur locally, such as the front side of the device body.

[0044] Second Embodiment In the above-described embodiment, an example was shown in which the CPU temperature was set to a low temperature environment or a high temperature environment depending on whether it was below a threshold temperature. However, it is also possible to set multiple threshold temperatures and switch the motor drive current value in multiple stages depending on the environmental temperature.

[0045] Fig. 10 is a flow chart showing the operation of setting the motor drive current value when the device environment is set in multiple stages. In this embodiment, as shown in Fig. 11, the control unit has a temperature-current data table in which the drive current value is set according to state 1 to state 6 depending on the device temperature, and sets the drive current value according to the detected CPU temperature.

[0046] To explain this in more detail, as shown in the flowchart of Fig. 10, when driving the carry motor 32, the current value control unit 301 sets the current value for driving the carry motor 32 to the drive current value in "state 1" as an initial setting (S21). This state 1 is the state in which the set environmental temperature is the lowest, as shown in the temperature table in Fig. 11. In this way, the motor drive current value is set to the largest value, thereby preventing the drive torque of the carry motor from becoming insufficient.

[0047] Next, the CPU temperature is detected by the temperature detection unit 303, and the device state is set according to the CPU temperature. In this embodiment, as shown in Fig. 11, state 1 to state 6 are set according to the device environmental temperature, and for example, when the detected CPU temperature is in the range of 35°C-40°C, the temperature obtained by subtracting the self-heating temperature of the CPU and the self-heating temperature of the elements mounted on the control board such as the motor driver 302 from the CPU temperature is calculated as the environmental temperature (10°C-15°C) in the same manner as in the above-mentioned embodiment, and "state n" (n=3 in this case) is determined, and the motor drive current value for state n is set to 720 mA (S23, S24).

[0048] Thereafter, every time a predetermined time (e.g., one minute) elapses (S25), the CPU temperature is detected (S26), and the environmental temperature is calculated from the detected temperature as described above (S27). Then, it is determined whether the calculated environmental temperature exceeds the upper threshold temperature of the "state n" determined above (S28). If it exceeds the upper threshold temperature, it is determined that the environmental temperature has changed to the next higher level, "state n+1," and the drive current value for "state n+1" is set (S29, S24). For example, in the state 3, if the environmental temperature calculated from the CPU temperature exceeds the upper threshold temperature of 15°C for state 3, the drive current value for the next "state 4" is set to 690 mA.

[0049] On the other hand, if the upper threshold temperature is not exceeded, it is determined whether the environmental temperature calculated from the detected CPU temperature is equal to or lower than the lower threshold temperature of "state n" (S30), and if it is equal to or lower than the lower threshold temperature, it is determined that the environmental temperature has changed to "state n-1", one level lower, and the drive current value is set to "state n-1" (S31, S24). For example, in the state 3, if the environmental temperature calculated from the CPU temperature is equal to or lower than the lower threshold temperature of 10°C of state 3, the drive current value is set to 760 mA for "state 2".

[0050] By detecting the CPU temperature as described above, it is possible to set the motor drive current value suited to the environmental conditions in multiple stages, as shown in Fig. 12, without providing a separate sensor for detecting the environmental temperature. Note that, as shown in the graph in Fig. 12, the motor drive current value (graph A) is set to a value with a margin relative to the minimum current value (graph B) required to drive the motor according to the environmental temperature.

[0051] Third Embodiment In the above-described embodiment, an example was shown in which the drive current value of the conveying motor (first motor) 32 that drives the conveying rollers 30a, 30b via a conveying motor driver (first motor driver) was controlled, but the above-described control of the motor drive current value can be similarly performed for other motors.

[0052] For example, in the same manner as the drive current value control of the conveying motor 32 described above, the discharge motor (second motor) 33 that drives the discharge roller 31 in the sheet processing apparatus B via the discharge motor driver (second motor driver) may be controlled by calculating the environmental temperature from the CPU temperature detected by the temperature detection unit 303 and controlling the drive current value depending on whether the temperature exceeds a predetermined threshold temperature. In this case, the conveying motor 32 and the discharge motor 33 may be disposed at different positions, and the environmental temperatures of the motors may differ. Therefore, the threshold temperature (first threshold temperature) that is the reference for controlling the drive current value of the conveying motor 32 and the threshold temperature (second threshold temperature) that is the reference for controlling the drive current value of the discharge motor 33 may be set to be different from each other.

[0053] That is, when the temperature detected by the temperature detection unit 303 exceeds a set first threshold temperature, the drive current value for driving the carry motor 32 is controlled to be smaller than when the temperature is equal to or lower than the first threshold temperature, and when the temperature detected by the temperature detection unit 303 exceeds a set second threshold temperature, the drive current value for driving the discharge motor 33 is controlled to be smaller than when the temperature is equal to or lower than the second threshold temperature. In this way, by setting an appropriate threshold temperature for each motor, drive current value control suitable for the environmental temperature of each motor can be executed.

[0054] In addition, in the above-described embodiment, an example was shown in which the motor drive current value was changed stepwise by corresponding the CPU temperature detected by the temperature detection unit 303 to a threshold temperature, but the threshold temperature may be set continuously and the motor drive current value may be controlled to be changed continuously in accordance with the detected temperature. [Explanation of symbols]

[0055] A … Image forming device B … Sheet processing device 10...Intake port 14 … Processing tray 15 ... Stack Tray 19 ... Sweeping paddle 20...Knurled belt 21 … Sheet rear end stopper 22…matching plate 23 … Stapling unit 24 … Staple-free binding unit 30a, 30b ... conveyor rollers 31 ... Discharge roller 32 ...Transport motor 33 ... Ejection motor 100 ... sheet processing device control section 104 ...Sheet transport control section 201 ...Sheet feeding control unit 300 ... Control board 301 ... Current value control unit 302 ...Transport motor driver 303 ...Temperature detection unit

Claims

1. A conveying member for conveying a sheet; A processing unit that performs a predetermined process on the conveyed sheet; a discharge section for discharging the processed sheet; A conveying motor that applies a driving force to the conveying member; a control board having a control unit for controlling a drive current for driving the transport motor; a conveyance motor driver provided on the control board for driving the conveyance motor based on a drive current determined by the control unit; a temperature detection unit provided on the control board and configured to detect a temperature of the control unit; having The control unit controls the conveying motor so that, when the temperature detected by the temperature detection unit exceeds a set threshold temperature, the drive current value for driving the conveying motor is smaller than when the temperature is below the threshold temperature.

2. 2. The sheet processing apparatus according to claim 1, wherein the control unit controls the drive current value to change stepwise in accordance with a plurality of threshold temperatures set according to the temperature detected by the temperature detection unit.

3. a discharge member that discharges the sheet to the discharge section; an ejection motor that applies a driving force to the ejection member; an ejection motor driver provided on the control board for driving the ejection motor; having 2. The sheet processing apparatus according to claim 1, wherein the control unit controls the drive current value for driving the conveying motor to be smaller when the temperature detected by the temperature detection unit exceeds a set first threshold temperature than when the temperature is below the first threshold temperature, and controls the drive current value for driving the discharge motor to be smaller when the temperature detected by the temperature detection unit exceeds a set second threshold temperature than when the temperature is below the second threshold temperature.

4. 2. The sheet processing apparatus according to claim 1, wherein the transport member is a roller having a rotation axis extending in the front-rear direction of the apparatus body, and the control board is disposed rearward of the roller in the apparatus body.

5. an image forming device that forms an image on a sheet and discharges the sheet into a body space; a sheet processing device that is disposed in the body space and that performs a predetermined process on a sheet discharged from the image forming device; An image forming system comprising:

5. An image forming system, comprising: the sheet processing apparatus according to claim 1.

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