Electronic device, resist unit, and method for driving resist unit

Abstract

To provide a technology that can quickly dampen vibrations in a resist roller. [Solution] The electronic device according to this technology comprises a resist unit and a control unit. The resist unit includes a resist roller that supplies the recording medium to a processing unit that processes the recording medium, and a correction motor capable of moving the resist roller to correct the misalignment of the recording medium. The control unit drives the correction motor with a first pulse signal having a first frequency, and then drives the correction motor with a second pulse signal having a second frequency that is lower than the first frequency and is capable of applying a vibration component to the resist unit that is in phase with the vibration phase of the resist unit.

Description

Technical Field

[0001] This technology relates to technologies such as electronic devices including a registration roller for correcting paper misalignment.

Background Art

[0002] Patent Document 1 below discloses a sheet correction mechanism that supplies a sheet while correcting the misalignment of the sheet with respect to the image transfer position in an image forming unit. This sheet correction mechanism has a pair of registration rollers for conveying the sheet while correcting the lateral misalignment and the tilting misalignment of the sheet.

[0003] This pair of registration rollers is movable in the lateral direction (the width direction of the sheet) to correct the lateral misalignment of the sheet, and is also rotatable around a predetermined axis to correct the tilting misalignment of the sheet.

[0004] On the other hand, when the registration roller moves or rotates during sheet misalignment correction, there is a problem that the registration roller vibrates. When the sheet is supplied to the image transfer position of the image forming unit in a state where the registration roller is vibrating like this, there is also a problem that the image is transferred to the vibrating sheet, resulting in a deterioration in image quality.

[0005] Therefore, in the technology described in Patent Document 1, control is executed such that when the pair of registration rollers is moved in the lateral direction or rotated around a predetermined axis for misalignment correction, the speed is gradually decreased. That is, slowdown control is executed in the technology described in Patent Document 1.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] Simple slowdown control is technically insufficient to quickly dampen the vibrations of the resist roller.

[0008] In light of the above circumstances, the objective is to provide a technology that can quickly dampen vibrations in the resist roller. [Means for solving the problem]

[0009] The electronic device relating to this technology comprises a resist unit and a control unit. The resist unit includes a resist roller that supplies the recording medium to a processing unit that processes the recording medium, and a correction motor that can move the resist roller to correct any misalignment of the recording medium. The control unit drives the correction motor with a first pulse signal having a first frequency, and then drives the correction motor with a second pulse signal having a second frequency that is lower than the first frequency and is a frequency that allows vibration components in the resist unit to be applied to the resist unit that are in opposite phase to the vibration phase of the resist unit.

[0010] In this technology, when the correction motor is driven by a second pulse signal having a second frequency, a vibration component that is out of phase with the vibration in the resist unit can be applied to the resist unit. This out-of-phase vibration component can cancel out the vibration of the resist unit, and the vibration of the resist unit (resist roller) can be quickly dampened.

[0011] The resist unit relating to this technology includes a resist roller that supplies the recording medium to a processing unit that processes the recording medium, and a correction motor that can move the resist roller to correct the misalignment of the recording medium, The correction motor is driven by a first pulse signal having a first frequency, and then by a second pulse signal having a second frequency that is lower than the first frequency and is capable of applying a vibration component to the resist unit that is in phase with the vibration phase in the resist unit.

[0012] The driving method relating to this technology is a driving method for a resist unit that includes a resist roller that supplies the recording medium to a processing unit that processes the recording medium, and a correction motor that can move the resist roller in order to correct the misalignment of the recording medium, After driving the correction motor with a first pulse signal having a first frequency, the correction motor is then driven with a second pulse signal having a second frequency that is lower than the first frequency and capable of applying a vibration component to the resist unit that is in opposite phase to the vibration phase in the resist unit. [Effects of the Invention]

[0013] As described above, this technology provides a method for quickly dampening vibrations in the resist roller. [Brief explanation of the drawing]

[0014] [Figure 1] A diagram showing the electronic device according to this embodiment. [Figure 2] This is a side view showing the resist section. [Figure 3] This is a top view showing the resist section. [Figure 4] This diagram shows the pair of resist rollers in the resist section moving laterally. [Figure 5] This diagram shows the state when a pair of resist rollers in the resist section are rotating around the vertical axis (Z axis). [Figure 6] This is a cylinder showing the internal structure of the resist section. [Figure 7]It is a diagram showing the basic operation of the paper deviation correction process executed by the resist part. [Figure 8] It is a flowchart showing the lateral deviation correction process by the control unit according to the present embodiment. [Figure 9] It is a diagram showing a state when the first correction motor is driven only by the pulse signal of aHz without using the pulse signals of bHz and cHz. [Figure 10] It is a diagram showing a state when the first correction motor is driven using the pulse signals of aHz and cHz (and additionally the pulse signal of bHz) without using the pulse signal of bHz. [Figure 11] It is a diagram showing a state when the first correction motor is driven using all of the pulse signals of aHz, bHz, and cHz. [Figure 12] It is a diagram showing a state when a pair of resist rollers are moved xmm in the lateral direction (X-axis direction). [Figure 13] In the comparative example, it is a diagram showing the movement amount (vibration of the resist unit) of a pair of resist rollers when the pair of resist rollers are moved xmm in the lateral direction using only the pulse signal of aHz. [Figure 14] In the present embodiment, it is a diagram showing the movement amount (vibration of the resist unit) of a pair of resist rollers when the pair of resist rollers are moved xmm in the lateral direction using the pulse signals of aHz and cHz (and additionally the pulse signal of bHz). [Figure 15] It is a flowchart showing the inclination deviation correction process by the control unit according to the present embodiment. [Figure 16] It is a diagram showing a state when the second correction motor is driven only by the pulse signal of dHz without using the pulse signals of eHz and fHz. [Figure 17] It is a diagram showing a state when the second correction motor is driven using the pulse signals of dHz and fHz without using the pulse signal of eHz. [Figure 18]This figure shows the situation when the second correction motor is driven using all three pulse signals: a dHz pulse signal, an eHz pulse signal, and an fHz pulse signal. [Figure 19] This figure shows the state when a pair of resist rollers are rotated around the Z-axis by a target rotation angle θ°. [Figure 20] In the comparative example, this figure shows the rotation angle of a pair of resist rollers (vibration of the resist unit) when a pair of resist rollers are rotated θ° around the Z axis using only a dHz pulse signal. [Figure 21] In this embodiment, the figure shows the rotation angle of a pair of resist rollers (vibration of the resist unit) when a pair of resist rollers 32 are rotated θ° around the Z axis using a dHz pulse signal and an fHz pulse signal (in addition to an eHz pulse signal). [Modes for carrying out the invention]

[0015] The embodiments of this technology will be described below with reference to the drawings.

[0016] <Overall structure and structure of each part> Figure 1 is a block diagram showing the electronic device 100 according to this embodiment. The electronic device 100 according to this embodiment is a printer, copier, facsimile machine, or a multifunction device that has the functions of two or more of these devices (print function, copy function, printing function).

[0017] Typically, the electronic device 100 can be any device that is capable of correcting the misalignment of the paper 2 (recording medium: see Figures 2, 3, etc.) and is configured to perform predetermined processing on the paper 2 after the misalignment has been corrected.

[0018] As shown in Figure 1, the electronic device 100 according to this embodiment has a control unit 10 that comprehensively controls the entire electronic device 100. The electronic device 100 also has a supply unit 20 that supplies the paper 2 sequentially from the upstream side in the transport direction of the paper 2, a resist unit 30 that supplies the paper 2 to the processing unit 40 while correcting the displacement of the paper 2, a processing unit 40 that performs predetermined processing on the paper 2, and a discharge unit 50 that holds the paper 2 discharged from the processing unit 40.

[0019] In this embodiment, a transport path 1 is formed for transporting the paper 2 from the supply unit 20 to the discharge unit 50 via the resist unit 30 and the processing unit 40. In the example shown in Figure 1, the transport path 1 is conveniently shown as a straight line, but generally, this transport path 1 is configured as a curve from the viewpoint of saving space in the arrangement within the electronic device 100.

[0020] The control unit 10 includes, for example, a CPU (Central Processing Unit) and a motor driver that drives various motors in response to control signals from the CPU. The control unit 10 also includes a non-volatile memory where various programs and data necessary for CPU processing are stored, and a volatile memory used as the CPU's workspace. Furthermore, the control unit 10 includes a communication unit that communicates with other parts of the electronic device 100 and with external devices.

[0021] The supply unit 20 is capable of storing a certain number of sheets of paper 2, and is configured to supply one sheet of paper 2 at a time to the resist unit 30 as needed from among the stored sheets of paper 2. The supply unit 20 includes a supply tray capable of storing a certain number of sheets of paper 2, a supply roller that guides one sheet of paper 2 at a time from the supply tray to the transport path 1 and delivers it to the resist unit 30, a motor for driving the supply roller, and the like.

[0022] The resist unit 30 accurately transports the paper 2 supplied from the supply unit 20 along the transport path 1 while correcting for lateral and skew deviations, and then supplies the paper 2 to the processing unit 40. The configuration of the resist unit 30 will be described in detail later.

[0023] The processing unit 40 performs a predetermined process (typically an image forming process) on the paper 2 supplied from the resist unit 30. Examples of processes performed by the processing unit 40 include printing in the printer function (e.g., laser method, inkjet method, etc.), copying in the copy function (e.g., laser method, inkjet method, etc.), and printing in the facsimile function (e.g., laser method, inkjet method, etc.). The processing performed by the processing unit 40 can be any process that applies to the paper 2.

[0024] The discharge unit 50 is capable of receiving the paper 2 processed by the processing unit 40 from the processing unit 40 and discharging it from the transport path 1, and is also configured to store the paper 2 discharged from the transport path 1. This discharge unit 50 includes a discharge roller for discharging the paper 2 from the transport path 1, a motor for driving the discharge roller, and a discharge tray for storing the paper 2 discharged from the transport path 1.

[0025] [Resist part 30] Next, the configuration of the resist section 30 will be described in detail.

[0026] Figure 2 is a side view of the resist section 30, and Figure 3 is a top view of the resist section 30. Figure 4 shows the pair of resist rollers 32 of the resist section 30 as they are moving laterally. Figure 5 shows the pair of resist rollers 32 of the resist section 30 as they are rotating around the vertical axis (Z axis). Figure 6 is a block diagram showing the internal structure of the resist section 30.

[0027] In the figures of this embodiment, the direction corresponding to the length of the transport path 1 (the length of the paper 2) is defined as the Y-axis, and the direction corresponding to the width of the transport path 1 (the width of the paper 2) is defined as the X-axis direction. Furthermore, the direction perpendicular to the transport path 1 (the direction perpendicular to the paper surface) is defined as the Z-axis direction.

[0028] The resist unit 30 according to this embodiment includes a resist unit 31, a first sensor 33 provided downstream of the resist unit 31, and a second sensor 34 provided upstream of the resist unit 31.

[0029] The resist unit 31 includes a pair of resist rollers 32 and a resist motor 37 (see Figure 6) as a drive source for rotating the resist rollers 32. The resist unit 31 also includes a moving mechanism 35 (see Figure 4) for moving the pair of resist rollers 32 in the X-axis direction (lateral direction) and a rotating mechanism 36 (see Figure 5) for rotating the pair of resist rollers 32 around the Z-axis.

[0030] The pair of registration rollers 32 are capable of gripping the surface of the paper 2 from both sides, and the paper 2 can be transported by rotating while gripping the surface of the paper 2 from both sides. In this embodiment, one of the pair of registration rollers 32, the registration roller 32b, is a drive roller, and the other registration roller 32a is a driven roller that rotates in accordance with the rotation of the drive roller. Alternatively, both of the pair of registration rollers 32 may be drive rollers.

[0031] The pair of resist rollers 32 have a shape that is elongated in one direction (the X-axis direction). Alternatively, the pair of resist rollers 32 may be configured by being divided along the length direction (the X-axis direction). The resist motor 37 is a stepping motor that rotates the resist rollers 32 in response to commands from the control unit 10.

[0032] The pair of registration rollers 32 are movable laterally (in the longitudinal direction of the registration rollers: X-axis direction) by a moving mechanism 35, thereby correcting lateral displacement (X-axis direction displacement) of the paper 2 (see Figure 4). The pair of registration rollers 32 are also rotatable around the Z-axis by a rotation mechanism 36, thereby correcting tilt displacement (Z-axis direction displacement: skew) of the paper 2 (see Figure 5). In this embodiment, the pair of registration rollers 32 are provided with a pivot axis on one end in the longitudinal direction (X-axis direction), and are rotatable around this pivot axis.

[0033] The moving mechanism 35 is configured to allow a pair of resist rollers 32 to move integrally in the lateral direction (X-axis direction). The moving mechanism 35 consists of, for example, a base that holds the pair of resist rollers 32, a guide that slides the base, a first correction motor 38 as a drive source for movement (see Figure 6), and a rack and pinion mechanism (or ball screw mechanism) that converts the rotational motion of the first correction motor 38 into linear motion.

[0034] The first correction motor 38 is a stepping motor that moves a pair of register rollers 32 laterally (in the X-axis direction) in response to a command from the control unit 10.

[0035] The rotation mechanism 36 is configured to allow a pair of resist rollers 32 to rotate integrally around the Z-axis. The rotation mechanism 36 includes a base for holding the pair of resist rollers 32, a holding part for rotatably holding the base, a rotation shaft for rotating the base, and a second correction motor 39 (see Figure 6) as a drive source for rotation.

[0036] The second correction motor 39 is a stepping motor that rotates a pair of register rollers 32 around the Z-axis in response to commands from the control unit 10.

[0037] The first sensor 33, located downstream of the resist unit 31, is a sensor for detecting lateral displacement (displacement in the X-axis direction) of the paper 2. On the other hand, the second sensor 34, located upstream of the resist unit 31, is a sensor for detecting tilt displacement (displacement around the Z-axis) of the paper 2.

[0038] The first sensor 33 and the second sensor 34 are each composed of line sensors that are long in one direction (the X-axis direction). In this embodiment, a CIS (Contact Image Sensor) is used as the line sensor. Note that the first sensor 33 and the second sensor 34 can be any sensor that can detect the lateral displacement (amount of displacement and direction of displacement) and the tilt displacement (tilt angle and direction of tilt) of the paper 2, respectively.

[0039] In the examples shown in Figures 2 and 3, the first sensor 33 and the second sensor 34 are shown to be located outside the resist unit 31, but the first sensor 33 and the second sensor 34 may also be located inside the resist unit 31.

[0040] [Basic operations in misalignment correction processing] Next, the basic operation of the paper misalignment correction process performed by the resist unit 30 will be explained. Figure 7 is a diagram showing the basic operation of the paper misalignment correction process performed by the resist unit 30.

[0041] Referring to the top diagram in Figure 7, first, when the paper 2 is transported from the supply unit 20 to the resist unit 30, the edge of the paper 2 is detected by the second sensor 34, which is located upstream of the resist rollers 32 in the transport path 1. Based on the signal detected by the second sensor 34, the control unit 10 determines the tilt angle (with the X-axis direction being 0° as the reference) and the direction of the tilt of the paper 2. Then, the control unit 10 drives the second correction motor 39 to rotate the pair of resist rollers 32 by the same angle as the tilt angle of the paper 2.

[0042] As a result, the longitudinal orientation of the pair of registration rollers 32 coincides with the orientation of the short side of the inclined paper 2. At this time, the surface of the paper 2 is sandwiched from both sides by the pair of registration rollers 32 and fixed to the registration rollers 32. Note that in Figure 7, the pair of registration rollers 32 rotate counterclockwise because the paper 2 is inclined counterclockwise (viewed from above), but if the paper 2 is inclined clockwise (viewed from above), the pair of registration rollers 32 rotate clockwise.

[0043] Subsequently, the control unit 10 drives the second correction motor 39 to rotate the pair of register rollers 32 in the opposite direction by the same angle as before. As a result, as shown in the second figure from the top in Figure 7, the pair of register rollers 32 return to the position of the reference angle (0°) in the rotational direction, and the longitudinal direction of the pair of register rollers 32 coincides with the X-axis direction (the width direction of the transport path 1). This corrects the tilt misalignment of the paper 2.

[0044] As shown in the third figure from the top in Figure 7, the control unit 10 then drives the resist motor 37 to rotate the pair of resist rollers 32, transporting the paper 2 upstream in the transport direction (Y-axis direction). This allows the first sensor 33 to detect the edge of the paper 2.

[0045] Subsequently, the control unit 10 determines the amount and direction of the lateral displacement of the paper 2 based on the signal detected by the first sensor 33. Then, the control unit 10 drives the first correction motor 38 to move the pair of registration rollers 32 by the same distance as the amount of lateral displacement of the paper 2 in the opposite direction to the displacement.

[0046] As a result, as shown in the bottom diagram of Figure 7, the lateral displacement of the paper 2 is corrected, and the paper 2 can be accurately transported along the transport path 1 (without tilt or lateral displacement). Note that in Figure 7, the pair of registration rollers 32 are moved to the right because the paper 2 is laterally shifted to the left, but if the paper 2 is laterally shifted to the right, the pair of registration rollers 32 will be moved to the left.

[0047] In this embodiment, when the pair of registration rollers 32 are moved laterally to correct the lateral displacement of the paper 2, the pair of registration rollers 32 are rotated by the registration motor 37, and the paper 2 is transported toward the upstream side in the transport direction. On the other hand, when the pair of registration rollers 32 are moved laterally to correct the lateral displacement of the paper 2, the rotation of the pair of registration rollers 32 by the registration motor 37 may be temporarily suspended.

[0048] In this embodiment, special slowdown control related to this technology is executed during the tilt misalignment correction process (see the two upper figures in Figure 7). Similarly, in this embodiment, special slowdown control related to this technology is executed during the lateral misalignment correction process (see the two lower figures in Figure 7). As a result, in this embodiment, the time required for misalignment correction of the paper 2 is shortened, and the vibration of the resist unit 31 during misalignment correction of the paper 2 is quickly dampened. Details of these misalignment correction processes will be described later.

[0049] [Basic Concepts of This Technology] Next, I will explain the basic concept of this technology.

[0050] First, in this embodiment, as described above, it is necessary to rotate and move laterally a pair of registration rollers 32 in order to correct the misalignment of the paper 2. At this time, there is a problem that the entire registration unit 31 vibrates. When the registration unit 31 is vibrating, if the paper 2 is supplied to the processing unit 40 and processing is performed on the paper 2, the quality of the processing (image quality, print quality, etc.) will deteriorate.

[0051] In this case, one possible method is to increase the distance between the resist section 30 (resist roller 32) and the processing section 40 (processing position) to mitigate the reduction in processing quality (image quality, print quality, etc.) due to vibrations of the resist unit 31. However, in recent years, there has been a growing demand for miniaturization of electronic devices 100, and from this perspective, it is generally difficult to increase the distance between the resist section 30 (resist roller 32) and the processing section 40 (processing position).

[0052] In addition, a waiting period may be used to allow the vibration of the resist unit 31 to subside after the misalignment correction process. This waiting period is at least 50ms, and is generally around 100ms. However, setting this waiting period leads to a delay in the processing time of the paper 2 in the entire electronic device 100.

[0053] Furthermore, during lateral displacement correction and tilt displacement correction, it is conceivable to perform slowdown control, which involves gradually reducing the movement and rotation speed of the pair of registration rollers 32. However, simple slowdown control has the problem that displacement correction takes a long time. If displacement correction takes a long time, especially when the distance between the registration section 30 and the processing section 40 is short, it is possible that the paper 2 may reach the processing position of the processing section 40 before the displacement correction is completed.

[0054] Furthermore, in the case of simple slowdown control, depending on the rotation angle and amount of movement during displacement correction, the vibration of the resist unit 31 may not subside due to the resonant frequency relationship caused by the spring-mass damper component inherent to the resist unit 31. In other words, simple slowdown control is insufficient as a technique for reducing the vibration of the resist unit 31.

[0055] Therefore, in this embodiment, the process described below, namely special slowdown control, is used to shorten the time required for correcting the misalignment of the paper 2, while also quickly dampening the vibration of the resist unit 31 during the misalignment correction of the paper 2. This is the basic concept of this technology.

[0056] [Lateral displacement correction processing] Next, the lateral displacement correction process performed by the control unit 10 will be explained in detail (see the two lower figures in Figure 7).

[0057] Figure 8 is a flowchart showing the lateral displacement correction process by the control unit 10 according to this embodiment. Figures 9 to 11 are supplementary diagrams illustrating the lateral displacement correction process.

[0058] This explanation will first describe the values ​​such as Amax, Bmax, Cmax, and aHz, bHz, cHz, which are pre-stored as predetermined values ​​in the memory of the control unit 10, referring to Figures 9 to 11.

[0059] First, aHz, bHz, and cHz represent the frequencies of the pulse signals input to the first correction motor 38 in order to drive the first correction motor 38. Note that the relationship aHz > bHz > cHz is satisfied. The higher the frequency of the pulse signal, the faster the lateral movement speed of the pair of register rollers 32 becomes, so the lateral movement speed of the pair of register rollers 32 increases in the order aHz > bHz > cHz.

[0060] Here, the frequency of the cHz pulse signal is a frequency that allows a vibration component to be applied to the resist unit 31 that is out of phase with the vibration of the resist unit 31 when lateral displacement correction is performed (the natural vibration corresponding to the spring-mass damper component of the resist unit 31). In other words, when the first correction motor 38 is driven at a frequency of cHz, a vibration component out of phase with the vibration of the resist unit 31 is applied to the resist unit 31, thereby canceling out the vibration of the resist unit 31 and causing the vibration to quickly attenuate. This frequency value has been measured experimentally and stored in memory as a value that can appropriately attenuate the vibration of the entire resist unit 31.

[0061] Amax (the first threshold) is the upper limit of the number of pulses in a pulse signal at aHz (high frequency: lateral movement is fast: high, medium, and low are relative expressions). In other words, an aHz pulse signal (the first pulse signal) can only be used with a number of pulses in the range of 1 or more and less than or equal to Amax; a number of pulses exceeding Amax cannot be used.

[0062] Bmax is the upper limit of the number of pulses in a pulse signal of bHz (medium frequency: lateral movement is medium speed: high, medium, and low are relative expressions). In other words, a bHz pulse signal (third pulse signal) can only be used with a number of pulses in the range of 1 or more and less than or equal to Bmax, and a number of pulses exceeding Bmax cannot be used.

[0063] Cmax (the second threshold) is the upper limit of the number of pulses in a cHz pulse signal (low frequency for applying inverse phase oscillation: lateral movement is slow: high, medium, and low are relative expressions). In other words, a cHz input pulse signal (the second pulse signal) can only be used with a number of pulses in the range of 1 or more and less than or equal to Cmax, and a number of pulses exceeding Cmax cannot be used.

[0064] Furthermore, the relationship Amax + Bmax + Cmax = Xmax is satisfied. Xmax is the number of pulses corresponding to the maximum lateral movement (X-axis direction) of the pair of register rollers 32. In other words, when the first correction motor 38 receives input pulses equal to Xmax, the register rollers 32, which are located at the reference position (displacement 0), move laterally to the limit position.

[0065] Next, the processing of the control unit 10 will be explained with reference to Figure 8. First, the control unit 10 calculates the amount of lateral displacement (in the X-axis direction) of the paper 2 based on the signal detected by the first sensor 33 (ST101). Next, the control unit 10 determines whether the amount of lateral displacement of the paper 2 is greater than or equal to a preset threshold (ST102).

[0066] If the lateral displacement of paper 2 is less than the threshold (ST102 NO), the control unit 10 terminates the process. On the other hand, if the lateral displacement of paper 2 is greater than or equal to the threshold (ST102 YES), the control unit 10 calculates the rotation direction of the first correction motor 38 (forward rotation: +X direction, reverse rotation: -X direction) necessary to correct the lateral displacement of paper 2 (ST103).

[0067] Next, the control unit 10 calculates the number of pulses N to be input to the first correction motor 38 in order to correct the lateral displacement of the paper 2 (ST104). Note that the greater the lateral displacement of the paper 2, the greater the need to move the pair of registration rollers 32 laterally, and therefore the number of input pulses N also increases. Note that this number of input pulses N is less than or equal to Xmax (=Amax+Bmax+Cmax) as described above.

[0068] Next, the control unit 10 determines whether the input pulse count N is less than or equal to Amax (ST105). As mentioned above, Amax is the upper limit of the pulse count in a Hz (high frequency: high speed movement) pulse signal.

[0069] If the number of input pulses N is less than or equal to Amax (YES in ST105), the control unit 10 assigns all of the input pulses N to driving with a Hz pulse signal (ST106). Then, the control unit 10 drives the first correction motor 38 with the number of pulses N and the Hz pulse signal (ST107).

[0070] In this case, neither the bHz pulse signal nor the cHz pulse signal is used, and the first correction motor 38 is driven by the aHz pulse signal alone.

[0071] Figure 9 shows the situation when the first correction motor 38 is driven using only an aHz pulse signal, without using bHz or cHz pulse signals.

[0072] Here, aHz is a relatively high frequency, and the lateral (X-axis) movement speed of the pair of resist rollers 32 is also relatively fast. On the other hand, in the case shown in Figure 9, the number of input pulses N is small to begin with, and the lateral movement distance of the pair of resist rollers 32 is also small. Therefore, the vibrations generated in the resist unit 31 are also small, and the vibrations of the resist unit 31 are quickly dampened even without using a cHz pulse signal (applying vibration components with opposite phase: low frequency) (or vibrations exceeding the permissible range (see Figures 13 and 14) do not occur).

[0073] In ST105, if the number of input pulses N to the first correction motor 38 exceeds Amax (NO in ST105), the control unit 10 determines whether the number of input pulses N is less than or equal to the sum of Amax and Cmmax (ST108). As mentioned above, Cmax is the upper limit of the number of pulses in the input pulse signal at cHz (applying an out-of-phase vibration component: low frequency).

[0074] If the number of input pulses N is less than or equal to the sum of Amax and Cmax (YES in ST108), the control unit 10 proceeds to the next ST109. In ST109, the control unit 10 allocates the number of pulses corresponding to Amax from the total number of input pulses N to drive the aHz pulse signal, and allocates the remaining number of pulses (N-Amax) to drive the cHz pulse signal.

[0075] Then, the control unit 10 drives the first correction motor 38 with a pulse signal of pulse number Amax and aHz (ST110). Subsequently, the control unit 10 drives the first correction motor 38 with a pulse signal of pulse number (N-Amax) and cHz (ST111).

[0076] In this case, the bHz pulse signal is not used, and the aHz pulse signal and the cHz pulse signal are used to drive the first correction motor 38.

[0077] Figure 10 shows the situation when the first correction motor 38 is driven using a Hz pulse signal and a c Hz pulse signal, without using a b Hz pulse signal.

[0078] In the case shown in Figure 10, first, the first correction motor 38 is driven by an aHz pulse signal, and the pair of register rollers 32 are quickly moved laterally (in the X-axis direction). Subsequently, the frequency of the pulse signal is reduced from aHz to cHz, and the first correction motor 38 is driven by a cHz pulse signal, reducing the lateral movement speed of the register rollers 32 (slowdown control: 2 stages).

[0079] In this embodiment, the frequency of the cHz pulse signal is set to a frequency that allows a vibration component in the opposite phase to the vibration of the resist unit 31 to be applied to the resist unit 31. Therefore, when the first correction motor 38 is driven at a frequency of cHz, a vibration component in the opposite phase to the vibration of the resist unit 31 is applied to the resist unit 31, thereby canceling out the vibration of the resist unit 31 and causing the vibration to quickly attenuate (special slowdown control).

[0080] In ST108, if the number of input pulses exceeds the sum of Amax and Cmax (NO in ST108), the control unit 10 proceeds to ST112. In ST112, the control unit 10 allocates the number of pulses corresponding to Amax from the total number of input pulses N to drive an aHz pulse signal, and the number of pulses corresponding to Cmax to drive a cHz pulse signal. Then, the control unit 10 allocates the remaining number of pulses (N-Amax-Cmax) to drive a bHz pulse signal.

[0081] Then, the control unit 10 drives the first correction motor 38 with a pulse signal of pulse number Amax and aHz (ST113). Subsequently, the control unit 10 drives the first correction motor 38 with a pulse signal of pulse number (N-Amax-Cmax) and bHz (ST114). Subsequently, the control unit 10 drives the first correction motor 38 with a pulse signal of pulse number Cmax and cHz (ST115).

[0082] In this case, the aHz pulse signal, the bHz pulse signal, and the cHz pulse signal are all used in this order to drive the first correction motor 38.

[0083] Figure 11 shows the situation when the first correction motor 38 is driven using all three pulse signals: aHz, bHz, and cHz.

[0084] In the case shown in Figure 11, first, the first correction motor 38 is driven by an aHz pulse signal, and the pair of register rollers 32 are quickly moved laterally (in the X-axis direction). Then, the frequency of the pulse signal is reduced from aHz to bHz, and the first correction motor 38 is driven by a bHz pulse signal, reducing the lateral movement speed of the register rollers 32. Subsequently, the frequency of the pulse signal is reduced from bHz to cHz, and the first correction motor 38 is driven by a cHz pulse signal, further reducing the lateral movement speed of the pair of register rollers 32 (slowdown control: 3 stages).

[0085] In this embodiment, the frequency of the cHz pulse signal is set to a frequency that allows a vibration component in the opposite phase to the vibration of the resist unit 31 to be applied to the resist unit 31. Therefore, when the first correction motor 38 is driven at a frequency of cHz, a vibration component in the opposite phase to the vibration of the resist unit 31 is applied to the resist unit 31, thereby canceling out the vibration of the resist unit 31 and causing the vibration to quickly attenuate (special slowdown control).

[0086] Furthermore, if the amount of movement of the pair of resist rollers 32 exceeds a certain value, the movement may take too long if only the aHz pulse signal and the cHz pulse signal are used. Therefore, in this embodiment, a bHz pulse signal is interposed between the aHz pulse signal drive and the cHz pulse signal drive.

[0087] Figure 12 shows the movement of a pair of register rollers 32 when they are moved x mm in the lateral direction (X-axis direction). Here, x mm is defined as the amount of movement of the pair of register rollers 32 when the number of pulses exceeding Amax is input to the first correction motor 38 (i.e., it is longer than the amount of movement corresponding to Figure 9).

[0088] Figure 13 shows the amount of movement of the pair of resist rollers 32 (vibration of the resist unit 31) when the pair of resist rollers 32 are moved x mm laterally using only a Hz pulse signal in the comparative example.

[0089] As shown in Figure 13, when a pair of register rollers 32 are moved laterally by x mm using only a Hz pulse signal, vibrations exceeding the acceptable range (overshoot, undershoot) occur, and it takes time for the vibrations to return to within the acceptable range.

[0090] Figure 14 shows the amount of movement of a pair of resist rollers 32 (vibration of the resist unit 31) when a pair of resist rollers 32 are moved x mm laterally using an a Hz pulse signal and a c Hz pulse signal (in addition to a b Hz pulse signal) in this embodiment.

[0091] As shown in Figure 14, in this embodiment, the frequency is gradually reduced, so the time it takes for the pair of resist rollers 32 to reach the target x mm point is longer than in the comparative example shown in Figure 13. However, in this embodiment, a cHz pulse signal applies a vibration component to the resist unit 31 that is out of phase with the vibration of the resist unit 31, thereby canceling out the vibration of the resist unit 31. Therefore, in this embodiment, the vibration of the resist unit 31 is dampened more quickly than in the comparative example, and the vibration is brought within an acceptable range more quickly than in the comparative example.

[0092] For example, in the comparative example shown in Figure 13, the vibration is not within the acceptable range at time t1, but in the present embodiment shown in Figure 14, the vibration is already within the acceptable range at the same time t1. [Tilt correction processing] Next, the tilt displacement correction process performed by the control unit 10 will be explained in detail (see the two upper figures in Figure 7).

[0093] Figure 15 is a flowchart showing the tilt misalignment correction process by the control unit 10 according to this embodiment. Figures 16 to 18 are supplementary diagrams illustrating the tilt misalignment correction process. In this embodiment, the tilt misalignment correction process is substantially the same as the lateral misalignment correction process described above.

[0094] This explanation will first describe the values ​​such as Dmax, Emax, Fmax, and dHz, eHz, and fHz, which are pre-stored as predetermined values ​​in the memory of the control unit 10, referring to Figures 16 to 18.

[0095] First, dHz, eHz, and fHz represent the frequencies of the pulse signals input to the second correction motor 39 in order to drive the second correction motor 39, respectively. Note that the relationship dHz > eHz > fHz is satisfied. The higher the frequency of the pulse signal, the faster the rotation speed of the pair of register rollers 32, so the rotation speed of the pair of register rollers 32 increases in the order dHz > eHz > fHz.

[0096] Here, the frequency of the fHz pulse signal is a frequency at which a vibration component in the opposite phase to the vibration of the resist unit 31 (the natural vibration corresponding to the spring-mass damper component of the resist unit 31) can be applied to the resist unit 31 when tilt shift correction is performed. In other words, when the second correction motor 39 is driven at a frequency of fHz, a vibration component in the opposite phase to the vibration of the resist unit 31 is applied to the resist unit 31, thereby canceling out the vibration of the resist unit 31 and causing the vibration to quickly attenuate. This frequency value has been measured experimentally and stored in memory as a value that can appropriately attenuate the vibration of the entire resist unit 31.

[0097] Dmax (the first threshold) is the upper limit of the number of pulses in a dHz (high frequency: rotation is high speed: high, medium, and low are relative expressions) pulse signal. In other words, a dHz pulse signal (the first pulse signal) can only be used with a number of pulses in the range of 1 or more and less than or equal to Dmax, and a number of pulses exceeding Dmax cannot be used.

[0098] Emax is the upper limit of the number of pulses in an eHz (medium frequency: rotation is medium speed: high, medium, and low are relative expressions) pulse signal. In other words, an eHz pulse signal (third pulse signal) can only be used with a number of pulses in the range of 1 or more and less than or equal to Emax, and a number of pulses exceeding Emax cannot be used.

[0099] Fmax (the second threshold) is the upper limit of the number of pulses in a pulse signal of fHz (low frequency for applying inverse phase vibration: rotation is slow speed: high, medium, and low are relative expressions). In other words, an fHz input pulse signal (the second pulse signal) can only be used with a number of pulses in the range of 1 or more and less than or equal to Fmax, and a number of pulses exceeding Fmax cannot be used.

[0100] Furthermore, the relationship Dmax + Emax + Fmax = θmax is satisfied. θmax is the number of pulses corresponding to the maximum rotational distance of the pair of resist rollers 32 around the Z axis. In other words, when the second correction motor 39 receives input pulses equal to θmax, the resist roller 32, which is positioned at the reference angle (0°), rotates around the Z axis to its limit position.

[0101] Next, the processing of the control unit 10 will be explained with reference to Figure 15. First, the control unit 10 calculates the tilt angle (around the Z axis) of the paper 2 based on the signal detected by the second sensor 34 (ST201). Next, the control unit 10 determines whether the tilt angle of the paper 2 is greater than or equal to a preset threshold (ST202).

[0102] If the tilt angle of paper 2 is less than the threshold (ST202 NO), the control unit 10 terminates the process. On the other hand, if the tilt angle of paper 2 is greater than or equal to the threshold (ST202 YES), the control unit 10 calculates the rotation direction of the second correction motor 39 (forward rotation: +θ direction, reverse rotation: -θ direction) necessary to correct the tilt of paper 2 (ST203).

[0103] Next, the control unit 10 calculates the number of pulses M to be input to the second correction motor 39, which is necessary to correct the tilt misalignment of the paper 2 (ST204). Note that the larger the tilt misalignment angle of the paper 2, the larger the pair of registration rollers 32 need to be rotated around the Z axis, and therefore the number of input pulses M also increases. Note that this number of input pulses M is less than or equal to the above-mentioned θmax (=Dmax+Emax+Fmax).

[0104] Next, the control unit 10 determines whether the input pulse count M is less than or equal to Dmax (ST205). As mentioned above, Dmax is the upper limit of the pulse count in a pulse signal with a dHz (high frequency: rotation is high speed) pulse signal.

[0105] If the input pulse count M is less than or equal to Dmax (YES in ST205), the control unit 10 assigns all input pulse counts M to driving with a dHz pulse signal (ST206). Then, the control unit 10 drives the second correction motor 39 with the pulse count M and the dHz pulse signal (ST207).

[0106] In this case, neither the eHz pulse signal nor the fHz pulse signal is used, and the second correction motor 39 is driven only by the dHz pulse signal.

[0107] Figure 16 shows the situation when the second correction motor 39 is driven using only a dHz pulse signal, without using eHz or fHz pulse signals.

[0108] Here, dHz is a relatively high frequency, and the rotational speed of the pair of resist rollers 32 around the Z axis is also relatively fast. On the other hand, in the case shown in Figure 16, the number of input pulses M is small to begin with, and the rotation angle of the pair of resist rollers 32 is also small. Therefore, the vibration generated in the resist unit 31 is also small, and the vibration of the resist unit 31 is quickly dampened even without using an fHz pulse signal (applying vibration components with opposite phase: low frequency) (or vibrations exceeding the allowable range (see Figures 20 and 21) do not occur).

[0109] In ST205, if the number of input pulses M to the second correction motor 39 exceeds Dmax (NO in ST205), the control unit 10 determines whether the number of input pulses M is less than or equal to the sum of Dmax and Fmmax (ST208). Fmax is, as described above, the upper limit of the number of pulses in an input pulse signal at fHz (applying an out-of-phase vibration component: low frequency).

[0110] If the input pulse count M is less than or equal to the sum of Dmax and Fmax (YES in ST208), the control unit 10 proceeds to the next ST209. In ST209, the control unit 10 allocates the number of pulses corresponding to Dmax from the total number of input pulses M to drive the dHz pulse signal, and allocates the remaining number of pulses (M-Dmax) to drive the fHz pulse signal.

[0111] Then, the control unit 10 drives the second correction motor 39 with pulse signals of pulse number Dmax and dHz (ST210). Subsequently, the control unit 10 drives the second correction motor 39 with pulse signals of pulse number (M-Dmax) and fHz (ST211).

[0112] In this case, the eHz pulse signal is not used; instead, the dHz pulse signal and the fHz pulse signal are used to drive the second correction motor 39.

[0113] Figure 17 shows the situation when the second correction motor 39 is driven using dHz and fHz pulse signals, but not eHz pulse signals.

[0114] In the case shown in Figure 17, first, a second correction motor 39 is driven by a dHz pulse signal, causing a pair of register rollers 32 to rotate rapidly around the Z-axis. Subsequently, the frequency of the pulse signal is reduced from dHz to fHz, and the second correction motor 39 is driven by an fHz pulse signal, reducing the rotational speed of the register rollers 32 around the Z-axis (slowdown control: 2 stages).

[0115] In this embodiment, the frequency of the fHz pulse signal is set to a frequency that allows a vibration component in the opposite phase to the vibration of the resist unit 31 to be applied to the resist unit 31. Therefore, when the second correction motor 39 is driven at a frequency of fHz, a vibration component in the opposite phase to the vibration of the resist unit 31 is applied to the resist unit 31, thereby canceling out the vibration of the resist unit 31 and causing the vibration to quickly attenuate (special slowdown control).

[0116] In ST208, if the input pulse count M exceeds the sum of Dmax and Fmax (NO in ST208), the control unit 10 proceeds to ST212. In ST212, the control unit 10 allocates the pulse count corresponding to Dmax to drive the dHz pulse signal, and the pulse count corresponding to Fmax to drive the fHz pulse signal. Then, the control unit 10 allocates the remaining pulse count (M - Dmax - Fmax) to drive the eHz pulse signal.

[0117] Then, the control unit 10 drives the second correction motor 39 with a pulse signal of pulse number Dmax and dHz (ST213). Subsequently, the control unit 10 drives the second correction motor 39 with a pulse signal of pulse number (M-Dmax-Fmax) and eHz (ST214). Subsequently, the control unit 10 drives the second correction motor 39 with a pulse signal of pulse number Fmax and fHz (ST215).

[0118] In this case, the dHz pulse signal, the eHz pulse signal, and the fHz pulse signal are all used in this order to drive the second correction motor 39.

[0119] Figure 18 shows the situation when the second correction motor 39 is driven using all three pulse signals: a dHz pulse signal, an eHz pulse signal, and an fHz pulse signal.

[0120] In the case shown in Figure 18, first, a second correction motor 39 is driven by a dHz pulse signal, causing the pair of register rollers 32 to rotate rapidly around the Z-axis. Subsequently, the frequency of the pulse signal is reduced from dHz to eHz, and the second correction motor 39 is driven by an eHz pulse signal, reducing the rotational speed of the register rollers 32 around the Z-axis. Then, the frequency of the pulse signal is further reduced from eHz to fHz, and the second correction motor 39 is driven by an fHz pulse signal, further reducing the rotational speed of the pair of register rollers 32 around the Z-axis (slowdown control: 3 stages).

[0121] In this embodiment, the frequency of the fHz pulse signal is set to a frequency that allows a vibration component in the opposite phase to the vibration of the resist unit 31 to be applied to the resist unit 31. Therefore, when the second correction motor 39 is driven at a frequency of fHz, a vibration component in the opposite phase to the vibration of the resist unit 31 is applied to the resist unit 31, thereby canceling out the vibration of the resist unit 31 and causing the vibration to quickly attenuate (special slowdown control).

[0122] Furthermore, if the rotation angle of the pair of resist rollers 32 exceeds a certain value, rotation may take a long time if only the dHz pulse signal and the fHz pulse signal are used. Therefore, in this embodiment, driving with an eHz pulse signal is interposed between driving with the dHz pulse signal and driving with the fHz pulse signal.

[0123] This explanation describes the operation when a pair of resist rollers 32 are rotated from a reference angle (0°) to a target rotation angle θ° (hereinafter referred to as forward rotation; see the top figure in Figure 7). On the other hand, the operation when a pair of resist rollers 32 are rotated from a target rotation angle θ° back to the reference angle (0°) (hereinafter referred to as reverse rotation; see the second figure from the top in Figure 7) is the same as the operation in forward rotation, except for the following points (1) and (2). Therefore, the details are omitted.

[0124] (1) In reverse rotation (reverse rotation), the rotation direction of the second correction motor 39 is opposite to that of forward rotation. (2) In reverse rotation, only the rotation direction is reversed from the preceding forward rotation, and it should perform the same movement as that forward rotation, so it is not necessary to calculate ST201~206, ST208~209, ST212 etc. which have already been calculated.

[0125] Figure 19 shows the state when a pair of register rollers 32 are rotated around the Z axis by a target rotation angle θ°. Here, the rotation angle θ° is defined as the rotation angle of the pair of register rollers 32 when the number of pulses exceeding Dmax is input to the second correction motor 39 (i.e., it is larger than the rotation angle corresponding to Figure 16).

[0126] Figure 20 shows the rotation angle of the pair of resist rollers 32 (vibration of the resist unit 31) when the pair of resist rollers 32 are rotated θ° around the Z axis using only a dHz pulse signal in the comparative example.

[0127] As shown in Figure 20, when the pair of register rollers 32 are rotated θ° around the Z axis using only a dHz pulse signal, vibrations exceeding the allowable range (overshoot, undershoot) occur, and it takes time for the vibrations to return to within the allowable range.

[0128] Figure 21 shows the rotation angle of the pair of resist rollers 32 (vibration of the resist unit 31) when the pair of resist rollers 32 are rotated θ° around the Z axis using a dHz pulse signal and an fHz pulse signal (in addition to an eHz pulse signal) in this embodiment.

[0129] As shown in Figure 21, in this embodiment, the frequency is gradually reduced, so the time it takes for the pair of resist rollers 32 to reach a rotation angle θ° is longer than in the comparative example shown in Figure 20. However, in this embodiment, the fHz pulse signal applies a vibration component to the resist unit 31 that is out of phase with the vibration of the resist unit 31, thereby canceling out the vibration of the resist unit 31. Therefore, in this embodiment, the vibration of the resist unit 31 is dampened more quickly than in the comparative example, and the vibration is brought within the acceptable range more quickly than in the comparative example.

[0130] For example, in the comparative example shown in Figure 20, the vibration is not within the acceptable range at time t2, but in the present embodiment shown in Figure 21, the vibration is already within the acceptable range at the same time t2.

[0131] While Figures 19 to 21 explain forward rotation, the same principles apply to reverse rotation (reverse rotation).

[0132] <Effect, etc.> As described above, in this embodiment, when the misalignment of the paper 2 is corrected by the pair of registration rollers 32, the speed of the movement (lateral movement, rotation) of the pair of registration rollers 32 is gradually reduced (slowdown control). Furthermore, the frequency (cHz, fHz) of the pulse signal used to drive the correction motor at the end is set to a frequency that allows a vibration component to be applied to (generated) the registration unit 31 that is in the opposite phase to the vibration phase of the registration unit 31 (special slowdown control).

[0133] As a result, a vibration component with the opposite phase to the vibration of the resist unit 31 is applied to the resist unit 31, so the vibration of the resist unit 31 is canceled out and the vibration is quickly dampened. In other words, in this embodiment, the time required for correcting the misalignment of the paper 2 can be shortened, and the vibration of the resist unit 31 during the correction of the misalignment of the paper 2 can be quickly dampened.

[0134] As a result, in this embodiment, even when the distance between the resist section 30 (resist roller 32) and the processing section 40 (processing position) is small, the paper 2 can be supplied to the processing section 40 with vibrations within an acceptable range. Therefore, it is possible to prevent a decrease in the quality of processing (image quality, print quality, etc.) of the paper 2 in the processing section 40.

[0135] Furthermore, in this embodiment, the waiting time required to wait for the vibration of the resist unit 31 to subside after the misalignment correction process can be shortened (for example, to 30ms or less) (or the waiting time itself can be eliminated). In this embodiment, misalignment correction with an accuracy of 0.1mm is possible.

[0136] <Various variations> The above explanation describes the case where the number of speed stages in (special) slowdown control is a maximum of three. However, this number of stages can be changed as appropriate.

[0137] The above description explains the case in which special slowdown control is performed in both the lateral displacement correction process and the tilt displacement correction process, but special slowdown control may be performed in either one of these processes. Furthermore, in this embodiment, the case in which special slowdown control is performed in both the forward rotation and the reverse rotation (reverse rotation) during the tilt displacement correction process was explained, but special slowdown control may be performed in either one of these processes.

[0138] The above explanation describes the case where the frequency values ​​at cHz and fHz (for applying out-of-phase vibration components) are fixed. On the other hand, the frequency values ​​at cHz and fHz may be controlled to be variable. For example, the frequency value at cHz may be controlled to be variable according to the amount of movement of the pair of resist rollers 32 during lateral displacement correction. Also, for example, the frequency value at fHz may be controlled to be variable according to the rotation angle of the pair of resist rollers 32 during tilt displacement correction. In this case, the vibration of the resist unit 31 can be damped more accurately and quickly.

[0139] In the above explanation, paper 2 was used as an example of a recording medium to be processed, but the recording medium is not limited to paper 2. The recording medium may be, for example, metal, resin, cloth, wood, etc. [Explanation of symbols]

[0140] 1…Conveyor path 2… Paper 30... Resistant section 31…Resist Unit 32... A pair of resist rollers 33...First sensor 34…Second sensor 35...Movement mechanism 36... Rotating mechanism 37…Resist Motor 38...First correction motor 39...Second correction motor 40… Processing Unit 100...Electronic equipment

Claims

1. A resist unit including a resist roller that supplies the recording medium to a processing unit that processes the recording medium, and a correction motor that can move the resist roller to correct the misalignment of the recording medium, A control unit drives the correction motor with a first pulse signal having a first frequency, and then drives the correction motor with a second pulse signal having a second frequency that is lower than the first frequency and is capable of applying a vibration component to the resist unit that is in opposite phase to the vibration phase of the resist unit. An electronic device equipped with the following features.

2. The electronic device according to claim 1, The control unit drives the correction motor with a third pulse signal having a third frequency lower than the first frequency and higher than the second frequency, after driving the correction motor with the first pulse signal and before driving the correction motor with the second pulse signal. electronic equipment.

3. The electronic device according to claim 2, The control unit determines whether the number of input pulses to the correction motor necessary for correcting the misalignment of the recording medium is less than or equal to a first threshold, and if the number of input pulses is less than or equal to the first threshold, it drives the correction motor using the first pulse signal without using the second pulse signal and the third pulse signal. electronic equipment.

4. The electronic device according to claim 3, The control unit, when the number of input pulses is less than or equal to the first threshold, assigns all of the number of input pulses to drive by the first pulse signal. electronic equipment.

5. The electronic device according to claim 4, The first threshold is the upper limit of the number of pulses allocated to driving with the first pulse signal. electronic equipment.

6. The electronic device according to claim 3, If the number of input pulses to the correction motor required to correct the misalignment of the recording medium exceeds the first threshold, the control unit determines whether the number of input pulses is less than or equal to the sum of the first and second thresholds. If the number of input pulses is less than or equal to the sum of the first and second thresholds, the control unit drives the correction motor using the first and second pulse signals without using the third pulse signal. electronic equipment.

7. The electronic device according to claim 6, If the number of input pulses is less than or equal to the sum of the input pulses, the control unit allocates a number of pulses corresponding to the first threshold to drive with the first pulse signal, and allocates the remaining number of pulses corresponding to the number obtained by subtracting the first threshold from the input pulses to drive with the second pulse signal. electronic equipment.

8. The electronic device according to claim 7, The second threshold is the upper limit of the number of pulses allocated to driving with the second pulse signal. electronic equipment.

9. The electronic device according to claim 6, If the number of input pulses to the correction motor required to correct the misalignment of the recording medium exceeds the sum of the values, the control unit drives the correction motor using the first pulse signal, the second pulse signal, and the third pulse signal. electronic equipment.

10. The electronic device according to claim 9, If the number of input pulses exceeds the sum, the control unit allocates the number of pulses corresponding to the first threshold to drive with the first pulse signal, the number of pulses corresponding to the second threshold to drive with the second pulse signal, and the remaining number of pulses corresponding to the number obtained by subtracting the first and second thresholds from the number of input pulses to drive with the third pulse signal. electronic equipment.

11. An electronic device according to any one of claims 1 to 10, The correction motor includes a first correction motor that moves the resist motor to correct the lateral displacement of the recording medium. electronic equipment.

12. An electronic device according to any one of claims 1 to 10, The correction motor includes a second correction motor that rotates the resist motor to correct the tilt misalignment of the recording medium. electronic equipment.

13. A resist unit comprising a resist roller that supplies the recording medium to a processing unit that processes the recording medium, and a correction motor capable of moving the resist roller to correct the misalignment of the recording medium, The correction motor is driven by a first pulse signal having a first frequency, and then by a second pulse signal having a second frequency that is lower than the first frequency and capable of applying a vibration component to the resist unit that is in phase with the vibration phase of the resist unit. Resist unit.

14. A method for driving a resist unit, which includes a resist roller that supplies the recording medium to a processing unit that processes the recording medium, and a correction motor capable of moving the resist roller to correct the misalignment of the recording medium, After driving the correction motor with a first pulse signal having a first frequency, the correction motor is driven again with a second pulse signal having a second frequency that is lower than the first frequency and capable of applying a vibration component to the resist unit that is in opposite phase to the vibration phase in the resist unit. Driving method.

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