Electronic device, alignment unit, and driving method of alignment unit

Abstract

An electronic apparatus includes an alignment unit and a control unit. The alignment unit includes: an alignment roller that supplies a recording medium to a processing unit that performs processing on the recording medium; and a correction motor capable of operating the alignment roller to correct the offset of the recording medium. The control unit drives the correction motor using a first pulse signal having a first frequency, and then drives the correction motor using a second pulse signal having a second frequency lower than the first frequency. And a frequency at which a vibration component having a phase opposite to that of the vibration of the alignment unit can be applied to the alignment unit.

Description

Technical Field

[0001] This invention relates to technologies such as an electronic device that includes an alignment roller for correcting paper misalignment. Background Technology

[0002] Japanese Patent Application Publication No. 2023-128149 discloses a sheet correction mechanism that supplies a sheet while correcting the offset of the sheet relative to the image transfer position in the image forming unit. This sheet correction mechanism has a pair of alignment rollers for conveying the sheet while correcting lateral and tilt offsets.

[0003] The pair of alignment rollers can move laterally (in the width direction of the paper) to correct lateral offset of the sheet, and can also rotate about a specified axis to correct tilt offset of the sheet.

[0004] On the other hand, there is a problem: if the alignment roller is moved or rotated while correcting the offset of the sheet, the alignment roller will vibrate. There is also a problem: if the sheet is supplied to the image transfer position of the image forming unit while the alignment roller is vibrating, the image will be transferred onto the vibrating paper, resulting in a decrease in image quality.

[0005] Therefore, in the technology disclosed in Japanese Patent Application Publication No. 2023-128149, when a pair of alignment rollers move laterally or rotate about a predetermined axis to correct misalignment, a phased reduction in their speed is performed. That is, deceleration control is performed in the technology disclosed in Japanese Patent Application Publication No. 2023-128149.

[0006] The problem the invention aims to solve

[0007] As a technique to rapidly attenuate the vibration of the alignment roller, simple deceleration control is insufficient. Summary of the Invention

[0008] In view of the above, the object of the present invention is to provide a technique that can rapidly attenuate the vibration of the alignment roller.

[0009] Solution for solving the problem

[0010] The electronic device of the present invention includes an alignment unit and a control unit.

[0011] The alignment unit includes: an alignment roller that supplies the recording medium to a processing unit that processes the recording medium; and a correction motor that can actuate the alignment roller to correct the offset of the recording medium.

[0012] After driving the correction motor with a first pulse signal having a first frequency, the control unit drives the correction motor with a second pulse signal having a second frequency. The second frequency is a frequency lower than the first frequency and is a frequency that can apply a vibration component with a phase opposite to the vibration of the alignment unit to the alignment unit.

[0013] In this technology, if a second pulse signal with a second frequency is used to drive the correction motor, it is possible to apply a vibration component with a phase opposite to that of the alignment unit to the alignment unit. This vibration component with the opposite phase can cancel out the vibration of the alignment unit, enabling the vibration of the alignment unit (alignment roller) to decay rapidly.

[0014] The alignment unit of the present invention includes: an alignment roller that supplies the recording medium to a processing unit that processes the recording medium; and a correction motor that can actuate the alignment roller to correct for misalignment of the recording medium.

[0015] After being driven by a first pulse signal having a first frequency, the aforementioned correction motor is driven by a second pulse signal having a second frequency, wherein the second frequency is a frequency lower than the first frequency and is a frequency capable of applying a vibration component that is opposite in phase to the vibration of the alignment unit to the alignment unit.

[0016] The driving method of the present invention is a driving method for an alignment unit, the alignment unit comprising: an alignment roller that supplies the recording medium to a processing unit that processes the recording medium; and a correction motor that enables the alignment roller to actuate to correct the misalignment of the recording medium.

[0017] After driving the correction motor with a first pulse signal having a first frequency, the correction motor is driven with a second pulse signal having a second frequency, the second frequency being a frequency lower than the first frequency, and capable of applying a vibration component with a phase opposite to the vibration of the alignment unit to the alignment unit.

[0018] Invention Effects

[0019] As described above, according to the present invention, a technique is provided that can rapidly attenuate the vibration of the alignment roller. Attached Figure Description

[0020] Figure 1 This is a block diagram illustrating the electronic device of this embodiment.

[0021] Figure 2 This is a side view showing the alignment section.

[0022] Figure 3 This is a top view showing the alignment section.

[0023] Figure 4 This is a diagram showing the state of a pair of alignment rollers in the alignment section when they move laterally.

[0024] Figure 5 This is a diagram showing the state of the pair of alignment rollers in the alignment section when they rotate about the vertical axis (Z-axis).

[0025] Figure 6 This is a block diagram showing the internal structure of the alignment section.

[0026] Figure 7 This diagram illustrates the basic operation of the paper offset correction process performed by the alignment unit.

[0027] Figure 8 This is a flowchart illustrating the lateral offset correction process performed by the control unit in this embodiment.

[0028] Figure 9 This is a diagram showing the state when the first correction motor is driven using only an aHz pulse signal, without using bHz and cHz pulse signals.

[0029] Figure 10 This is a diagram showing the state when the first correction motor is driven using aHz and cHz pulse signals instead of bHz pulse signals.

[0030] Figure 11 This is a diagram showing the state when the first correction motor is driven using all the aHz, bHz, and cHz pulse signals.

[0031] Figure 12 This is a diagram showing the state when a pair of alignment rollers are moved x mm laterally (X-axis direction).

[0032] Figure 13 This is a graph showing the amount of movement (vibration of the alignment unit) of a pair of alignment rollers when a pair of alignment rollers are moved laterally by x mm using only an aHz pulse signal in the comparative example.

[0033] Figure 14 This is a graph showing the amount of movement (vibration of the alignment unit) of a pair of alignment rollers when a pair of alignment rollers are moved laterally by x mm using a pulse signal of a Hz and a pulse signal of c Hz (in addition to a pulse signal of b Hz).

[0034] Figure 15 This is a flowchart illustrating the tilt offset correction process performed by the control unit in this embodiment.

[0035] Figure 16This diagram illustrates the state when the second correction motor is driven using only a dHz pulse signal, without using eHz and fHz pulse signals.

[0036] Figure 17 This is a diagram showing the state when the second correction motor is driven using dHz and fHz pulse signals instead of eHz pulse signals.

[0037] Figure 18 This is a diagram showing the state when the second correction motor is driven using all the dHz, eHz, and fHz pulse signals.

[0038] Figure 19 This is a diagram showing the state when a pair of alignment rollers are rotated about the Z-axis by a target rotation angle θ°.

[0039] Figure 20 This is a graph showing the rotation angle (vibration of the alignment unit) of a pair of alignment rollers when a pair of alignment rollers are rotated θ° around the Z-axis using only a dHz pulse signal in the comparative example.

[0040] Figure 21 This is a graph showing the rotation angle (vibration of the alignment unit) of a pair of alignment rollers when a pair of alignment rollers 32 are rotated θ° around the Z-axis using dHz pulse signals and fHz pulse signals (in addition to bHz pulse signals) in this embodiment. Detailed Implementation

[0041] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0042] <Overall structure and the structure of each part>

[0043] Figure 1 This is a block diagram illustrating the electronic device 100 of this embodiment. The electronic device 100 of this embodiment is a printer, copier, fax machine, or a multifunction machine that has the functions of two or more of these devices (printing function, copying function, printing function).

[0044] Typically, electronic device 100 is capable of recording paper 2 (recording medium: reference). Figure 2 , Figure 3 The offset correction (etc.) can be any device as long as it is configured to perform the prescribed processing on the offset-corrected paper 2.

[0045] like Figure 1As shown, the electronic device 100 of this embodiment has a control unit 10 that controls the entire electronic device 100. Furthermore, the electronic device 100, starting from the upstream side in the transport direction of the paper 2, sequentially includes: a supply unit 20 that supplies the paper 2; an alignment unit 30 that corrects the offset of the paper 2 and supplies the paper 2 to a processing unit 40; a processing unit 40 that performs a prescribed processing on the paper 2; and a discharge unit 50 that holds the paper 2 discharged from the processing unit 40.

[0046] In this embodiment, a transport path 1 for transporting the paper 2 is formed along the path from the supply unit 20 through the alignment unit 30 and the processing unit 40 to the discharge unit 50. Figure 1 In the example shown, the transport path 1 is illustrated as a straight line for convenience, but typically, from the viewpoint of saving space in the configuration within the electronic device 100, the transport path 1 is composed of curves.

[0047] The control unit 10 includes, for example, a CPU (Central Processing Unit) and a motor driver that drives various motors according to control signals from the CPU. Furthermore, the control unit 10 includes non-volatile memory storing various programs and data required for CPU processing, as well as volatile memory used as the CPU's working area. Additionally, the control unit 10 includes a communication unit for communicating with other parts of the electronic device 100 and external devices.

[0048] The supply unit 20 is configured to store a fixed number of sheets of paper 2, and furthermore, to supply sheets of paper 2 from the stored multiple sheets of paper 2 to the alignment unit 30 one by one as needed. The supply unit 20 includes a supply tray capable of storing a fixed number of sheets of paper 2, a supply roller that guides the sheets of paper 2 one by one from the supply tray to the transport path 1 and delivers them to the alignment unit 30, and an electric motor for driving the supply roller, etc.

[0049] The alignment unit 30 corrects for lateral and tilt deviations (skewness) of the paper 2 supplied from the supply unit 20 while accurately conveying the paper 2 along the transport path 1 and supplying it to the processing unit 40. The structure of the alignment unit 30 will be described in detail later.

[0050] The processing unit 40 performs a prescribed process (typically image forming process) on the paper 2 supplied from the alignment unit 30. Examples of the processes performed by the processing unit 40 include printing (e.g., laser, inkjet, etc.), copying (e.g., laser, inkjet, etc.), and faxing (e.g., laser, inkjet, etc.). Furthermore, the processing performed by the processing unit 40 can be any process as long as it involves the paper 2.

[0051] The discharge section 50 is configured to receive the paper 2 processed by the processing section 40 and discharge it from the transport path 1. In addition, it is capable of storing the paper 2 discharged from the transport path 1. The discharge section 50 includes a discharge roller that discharges the paper 2 from the transport path 1, a motor that drives the discharge roller, and a discharge tray that stores the paper 2 discharged from the transport path 1.

[0052] [Aiming section 30]

[0053] Next, the structure of the alignment part 30 will be described in detail.

[0054] Figure 2 This is a side view showing the alignment part 30. Figure 3 This is a top view showing the alignment part 30. Figure 4 This is a diagram showing the state of the pair of alignment rollers 32 of the alignment section 30 when they move laterally. Figure 5 This is a diagram showing the state of the pair of alignment rollers 32 of the alignment part 30 when they rotate about the vertical axis (Z axis). Figure 6 This is a block diagram showing the internal structure of the alignment part 30.

[0055] Furthermore, in the figures of this embodiment, the direction corresponding to the length direction of the transport path 1 (the length direction of the paper 2) is the Y-axis, and the direction corresponding to the width direction of the transport path 1 (the width direction of the paper 2) is the X-axis. Additionally, the direction perpendicular to the transport path 1 (the direction perpendicular to the paper surface) is the Z-axis.

[0056] The alignment unit 30 in this embodiment includes an alignment unit 31, a first sensor 33 disposed downstream of the alignment unit 31, and a second sensor 34 disposed upstream of the alignment unit 31.

[0057] Alignment unit 31 includes a pair of alignment rollers 32 and an alignment motor 37 (see reference) which serves as a drive source for rotating the alignment rollers 32. Figure 6 Furthermore, the alignment unit 31 includes a moving mechanism 35 that moves a pair of alignment rollers 32 in the X-axis direction (lateral direction) (see reference). Figure 4 ), and a rotation mechanism 36 (see reference) that rotates a pair of alignment rollers 32 about the Z-axis. Figure 5 ).

[0058] A pair of alignment rollers 32 can clamp the paper surface of the paper 2 from both sides and rotate while the paper surface of the paper 2 is clamped from both sides to transport the paper 2. In this embodiment, in the pair of alignment rollers 32, one alignment roller 32b is a drive roller and the other alignment roller 32a is a driven roller that rotates in conjunction with the rotation of the drive roller. Alternatively, both of the pair of alignment rollers 32 can be drive rollers.

[0059] The pair of alignment rollers 32 are elongated in one direction (X-axis direction). Alternatively, the pair of alignment rollers 32 may be configured to be segmented in the length direction (X-axis direction). The alignment motor 37 is a stepper motor that rotates the alignment rollers 32 according to instructions from the control unit 10.

[0060] A pair of alignment rollers 32 can be moved laterally (in the length direction of the alignment rollers: X-axis direction) via a moving mechanism 35, thereby correcting the lateral offset of the paper 2 (offset in the X-axis direction; see reference). Figure 4 Furthermore, a pair of alignment rollers 32 can rotate about the Z-axis via a rotating mechanism 36, thereby correcting the tilt offset of the paper 2 (offset about the Z-axis: skew; see reference). Figure 5 In addition, in this embodiment, a pair of alignment rollers 32 are provided with a rotating shaft at one end in the length direction (X-axis direction), and can rotate around the rotating shaft.

[0061] The moving mechanism 35 is configured to move a pair of alignment rollers 32 integrally in the lateral direction (X-axis direction). The moving mechanism 35 comprises, for example, a base holding the pair of alignment rollers 32, a guide portion that slidably guides the base, and a first correction motor 38 (see reference) serving as the drive source for movement. Figure 6 It consists of a rack and pinion mechanism (or ball screw mechanism) that converts the rotational motion of the first correction motor 38 into linear motion.

[0062] The first calibration motor 38 is a stepper motor that moves a pair of alignment rollers 32 laterally (in the X-axis direction) according to instructions from the control unit 10.

[0063] The rotation mechanism 36 is configured to enable a pair of alignment rollers 32 to rotate integrally about the Z-axis. The rotation mechanism 36 includes a base for holding the pair of alignment rollers 32, a holding portion for rotatably holding the base, a rotation shaft for rotating the base, and a second correction motor 39 (see reference 36) as the drive source for rotation. Figure 6 )wait.

[0064] The second calibration motor 39 is a stepper motor that rotates a pair of alignment rollers 32 around the Z-axis according to instructions from the control unit 10.

[0065] The first sensor 33, located downstream of the alignment unit 31, is used to detect the lateral offset (offset in the X-axis direction) of the paper 2. On the other hand, the second sensor 34, located upstream of the alignment unit 31, is used to detect the tilt offset (offset around the Z-axis) of the paper 2.

[0066] The first sensor 33 and the second sensor 34 are each composed of a linear sensor extending in one direction (X-axis direction). In this embodiment, a CIS (Contact Image Sensor) is used as the linear sensor. In addition, the first sensor 33 and the second sensor 34 can be any sensors as long as they are capable of detecting the lateral displacement (displacement amount and displacement direction) and the tilt displacement (tilt angle and tilt direction) of the paper 2, respectively.

[0067] In addition, Figure 2 and Figure 3 In the example shown, the first sensor 33 and the second sensor 34 are configured outside the alignment unit 31, but the first sensor 33 and the second sensor 34 can also be configured inside the alignment unit 31.

[0068] [Basic Operations of Offset Correction Processing]

[0069] Next, the basic operation of the offset correction process of the paper 2 performed by the alignment unit 30 will be explained. Figure 7 This diagram illustrates the basic operation of the offset correction process of the paper 2 performed by the alignment unit 30.

[0070] Reference Figure 7 In the top diagram, firstly, when the paper 2 is conveyed from the supply unit 20 to the alignment unit 30, the edge of the paper 2 is detected by a second sensor 34 located upstream of the conveying path 1, above the alignment rollers 32. Based on the signal detected by the second sensor 34, the control unit 10 determines the tilt angle (0° reference in the X-axis direction) 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 alignment rollers 32 by the same angle as the tilt angle of the paper 2.

[0071] Therefore, the longitudinal direction of the pair of alignment rollers 32 is aligned with the direction of the short side of the inclined paper 2. At this time, the paper surface of the paper 2 is clamped and fixed to the alignment rollers 32 from both sides by the pair of alignment rollers 32. In addition, in Figure 7 In the process, because the paper 2 is tilted in the counterclockwise direction (viewed from above), the pair of alignment rollers 32 also rotate in the counterclockwise direction. When the paper 2 is tilted in the clockwise direction (viewed from above), the pair of alignment rollers 32 also rotate in the clockwise direction.

[0072] Then, the control unit 10 drives the second correction motor 39, causing the pair of alignment rollers 32 to rotate by the same angle in the opposite direction as before. Thus, as... Figure 7As shown in the second figure from the top, a pair of alignment rollers 32 return to the reference angle (0°) position in the rotational direction, and the length direction of the pair of alignment rollers 32 is aligned with the X-axis direction (the width direction of the conveying path 1). As a result, the tilt offset of the paper 2 is corrected.

[0073] like Figure 7 As shown in the third figure from the top, the control unit 10 then drives the alignment motor 37 to rotate a pair of alignment rollers 32, conveying the paper 2 towards the upstream side in the conveying direction (Y-axis direction). Thus, the edge of the paper 2 is detected by the first sensor 33.

[0074] Then, the control unit 10 determines the lateral offset and the direction of the offset 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 a pair of alignment rollers 32 in the opposite direction to the offset direction by the same distance as the lateral offset of the paper 2.

[0075] Therefore, as Figure 7 As shown in the bottom diagram, it is possible to correct the lateral offset of paper 2, and accurately (without tilt or lateral offset) feed paper 2 along the transport path 1. Additionally, in Figure 7 In the process, because the paper 2 shifts laterally to the left, a pair of alignment rollers 32 move to the right, and when the paper 2 shifts laterally to the right, a pair of alignment rollers 32 move to the left.

[0076] In addition, in this embodiment, when the pair of alignment rollers 32 move laterally to correct the lateral offset of the paper 2, the pair of alignment rollers 32 are rotated by the alignment motor 37 to transport the paper 2 towards the upstream side of the conveying direction. On the other hand, when the pair of alignment rollers 32 move laterally to correct the lateral offset of the paper 2, the rotation of the pair of alignment rollers 32 can also be temporarily stopped by the alignment motor 37.

[0077] Here, in this embodiment, when performing tilt offset correction processing (refer to...) Figure 7 (See the two figures above) to perform the special deceleration control of the present invention. Similarly, in this embodiment, when performing lateral offset correction processing (refer to...) Figure 7 (See the two figures below) the special deceleration control of the present invention is implemented. Therefore, in this embodiment, the time spent on offset correction of the paper 2 is shortened, and the vibration of the alignment unit 31 is rapidly attenuated during offset correction of the paper 2. These offset correction processes will be described in detail later.

[0078] [Basic Concept of the Invention]

[0079] Next, the basic concept of the present invention will be explained.

[0080] First, in this embodiment, as described above, in order to perform the offset correction process for the paper 2, it is necessary to rotate and move the pair of alignment rollers 32 laterally. At this time, there is a problem of overall vibration of the alignment unit 31. If the paper 2 is supplied to the processing unit 40 and processed while the alignment unit 31 is vibrating, the quality of the processing (image quality, printing quality, etc.) will decrease.

[0081] In this case, it has been considered to mitigate the decline in processing quality (image quality, printing quality, etc.) caused by the vibration of the alignment unit 31 by increasing the distance between the alignment section 30 (alignment roller 32) and the processing section 40 (processing position). However, in recent years, there has been a strong demand for miniaturization of the electronic device 100, and from this point of view, it is generally difficult to extend the distance between the alignment section 30 (alignment roller 32) and the processing section 40 (processing position).

[0082] In addition, a waiting time is sometimes set to wait for the vibration of the alignment unit 31 to be controlled after the offset correction process. This waiting time is at least 50ms and is usually around 100ms. However, setting this waiting time will delay the overall paper 2 processing time of the electronic device 100.

[0083] Furthermore, deceleration control is considered, gradually slowing down the moving and rotating speeds of the pair of alignment rollers 32 during lateral and tilt offset corrections. However, with simple deceleration control, offset correction can take time. Therefore, it is also considered that if offset correction takes time, especially in cases where the distance between the alignment section 30 and the processing section 40 is short, the paper 2 may reach the processing position of the processing section 40 before the offset correction is completed.

[0084] Furthermore, under simple deceleration control, depending on the rotation angle and movement during offset correction, the vibration of the alignment unit 31 may sometimes fail to subside due to the resonant frequency of the inherent spring-mass damper component. In other words, simple deceleration control is insufficient as a technique for attenuating the vibration of the alignment unit 31.

[0085] Therefore, in this embodiment, through the processing described below, namely special deceleration control, the time spent on offset correction of the paper 2 is shortened, while the vibration of the alignment unit 31 during offset correction of the paper 2 is also rapidly attenuated. This is the basic concept of the present invention.

[0086] [Lateral Offset Correction Processing]

[0087] Next, the lateral offset correction process performed by the control unit 10 will be described in detail (see reference). Figure 7 (The two images on the bottom).

[0088] Figure 8 This is a flowchart illustrating the lateral offset correction process performed by the control unit 10 in this embodiment. Figures 9-11 This is a supplementary diagram used to illustrate the lateral offset correction process.

[0089] In this explanation, firstly, refer to Figures 9-11 The values ​​of Amax, Bmax, Cmax, aHz, bHz, cHz, etc., which are stored in the memory of the control unit 10 as predetermined values, will be explained.

[0090] First, aHz, bHz, and cHz represent the frequencies of the pulse signals input to the first calibration motor 38 to drive it. Furthermore, they satisfy the relationship aHz > bHz > cHz. The higher the frequency of the pulse signal, the faster the lateral movement of the pair of alignment rollers 32. Therefore, the lateral movement speed of the pair of alignment rollers 32 increases in the order aHz > bHz > cHz.

[0091] Here, the frequency of the cHz pulse signal is the frequency of the vibration component that is opposite in phase to the vibration of the alignment unit 31 (based on the inherent vibration of the spring-mass damper component of the alignment unit 31) when performing lateral offset correction. That is, when the first correction motor 38 is driven at a frequency of cHz, a vibration component that is opposite in phase to the vibration of the alignment unit 31 is applied to the alignment unit 31, thereby canceling the vibration of the alignment unit 31 and causing the vibration to decay rapidly. The value of this frequency, which is a value that can appropriately decay the vibration of the alignment unit 31 as a whole, can be experimentally measured and pre-stored in memory.

[0092] Amax (first threshold) is the upper limit of the number of pulses in aHz pulse signal (high frequency: horizontal movement is high speed; high, medium and low are relative terms). That is, an aHz pulse signal (first pulse signal) can only use a number of pulses in the range of 1 or higher and below Amax, and cannot use a number of pulses greater than Amax.

[0093] Bmax is the upper limit of the number of pulses for a bHz pulse signal (medium frequency: medium speed for lateral movement; high, medium, and low are relative terms). In other words, a bHz pulse signal (the third pulse signal) can only use a pulse count between 1 and Bmax; it cannot use a pulse count greater than Bmax.

[0094] Cmax (the second threshold) is the upper limit of the number of pulses in a cHz pulse signal (used to apply low-frequency, opposite-phase vibrations: low speed for lateral movement; high, medium, and low are relative terms). In other words, the input pulse signal (the second pulse signal) at cHz can only use a number of pulses within the range of 1 or more but less than Cmax; a number of pulses greater than Cmax cannot be used.

[0095] Furthermore, the relationship Amax + Bmax + Cmax = Xmax is satisfied. Xmax is the number of pulses corresponding to the maximum amount of movement of the pair of alignment rollers 32 in the lateral direction (X-axis direction). That is, when the first correction motor 38 is input with Xmax number of input pulses, the alignment roller 32 located at the reference position (displacement 0) moves laterally to the limit position.

[0096] Next, refer to Figure 8 The processing of the control unit 10 will be explained below. First, the control unit 10 calculates the lateral offset (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 lateral offset of the paper 2 is above a preset threshold (ST102).

[0097] If the lateral offset of paper 2 is less than the threshold (No in ST102), the control unit 10 ends the process. On the other hand, if the lateral offset of paper 2 is greater than or equal to the threshold (Yes in ST102), the control unit 10 calculates the rotation direction of the first correction motor 38 (forward rotation: +X direction, reverse rotation: -X direction) required to correct the lateral offset of paper 2 (ST103).

[0098] Next, the control unit 10 calculates the number of pulses N (ST104) required to be input to the first correction motor 38 to correct the lateral offset of the paper 2. Furthermore, the greater the lateral offset of the paper 2, the more significantly the pair of alignment rollers 32 need to move laterally, thus the larger the number of input pulses N becomes. Additionally, this number of input pulses N is less than or equal to Xmax (=Amax+Bmax+Cmax).

[0099] Next, the control unit 10 determines whether the number of input pulses N is less than or equal to Amax (ST105). As described above, Amax is the upper limit of the number of pulses of aHz (high frequency: high speed for movement) pulse signal.

[0100] When the number of input pulses N is less than or equal to Amax (as in ST105), the control unit 10 distributes all of the input pulses N to the drive using a pulse signal of aHz (ST106). Then, the control unit 10 drives the first correction motor 38 using the number of pulses N and the pulse signal of aHz (ST107).

[0101] In this case, the first correction motor 38 is driven only by the aHz pulse signal, without using the bHz and cHz pulse signals.

[0102] Figure 9 This is a diagram showing the state when the first correction motor 38 is driven using only an aHz pulse signal, without using bHz and cHz pulse signals.

[0103] Here, aHz is a relatively high frequency, and the movement speed of the pair of alignment rollers 32 in the lateral (X-axis direction) direction is also relatively faster. On the other hand, in Figure 9 In the scenario shown, the initial input pulse number N is small, and the lateral movement distance of the pair of alignment rollers 32 is also small. Therefore, the vibration generated in the alignment unit 31 is also small, so a cHz pulse signal (used to apply the vibration component with the opposite phase: low frequency) is not used, and the vibration of the alignment unit 31 decays rapidly (or does not exceed the allowable range (see reference)). Figure 13 and Figure 14 (such vibrations).

[0104] In ST105, if the number of input pulses N input to the first correction motor 38 is greater than 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 Cmax (ST108). Furthermore, as described above, Cmax is the upper limit of the number of pulses in the cHz (for applying the vibration component with opposite phase: low frequency) input pulse signal.

[0105] If the number of input pulses N is less than or equal to the sum of Amax and Cmax (as in ST108), the control unit 10 proceeds to ST109. In ST109, the control unit 10 allocates the number of pulses corresponding to Amax out of the total number of input pulses N to the drive using a Hz pulse signal, and allocates the remaining number of pulses (N-Amax) to the drive using a cHz pulse signal.

[0106] Then, the control unit 10 drives the first correction motor 38 (ST110) using a pulse signal with a pulse number Amax and aHz. After that, the control unit 10 drives the first correction motor 38 (ST111) using a pulse signal with a pulse number (N-Amax) and cHz.

[0107] In this case, the first correction motor 38 is driven by aHz and cHz pulse signals instead of bHz pulse signals.

[0108] Figure 10 This is a diagram showing the state when the first correction motor 38 is driven using aHz and cHz pulse signals instead of bHz pulse signals.

[0109] exist Figure 10 In the example shown, firstly, a pulse signal of aHz is used to drive the first correction motor 38, and a pair of alignment rollers 32 move rapidly in the lateral direction (X-axis direction). Then, the frequency of the pulse signal is reduced from aHz to cHz, and a cHz pulse signal is used to drive the first correction motor 38, reducing the lateral movement speed of the alignment rollers 32 (deceleration control: two stages).

[0110] In this embodiment, the frequency of the cHz pulse signal is the frequency of a vibration component that is opposite in phase to the vibration of the alignment unit 31. Therefore, when the first correction motor 38 is driven using a cHz frequency, a vibration component that is opposite in phase to the vibration of the alignment unit 31 is applied to the alignment unit 31, thereby canceling out the vibration of the alignment unit 31 and rapidly attenuating the vibration (special deceleration control).

[0111] In ST108, if the number of input pulses is greater than the sum of Amax and Cmax (No in ST108), the control unit 10 proceeds to ST112. In ST112, the control unit 10 allocates the pulses corresponding to Amax out of all the input pulses N to the drive using a pulse signal of aHz, and allocates the pulses corresponding to Cmax to the drive using a pulse signal of cHz. Then, the control unit 10 allocates the remaining pulses (N - Amax - Cmax) to the drive using a pulse signal of bHz.

[0112] Then, the control unit 10 drives the first correction motor 38 (ST113) using a pulse signal with a pulse number Amax and aHz. Afterwards, the control unit 10 drives the first correction motor 38 (ST114) using a pulse signal with a pulse number (N - Amax - Cmax) and bHz. Afterwards, the control unit 10 drives the first correction motor 38 (ST115) using a pulse signal with a pulse number Cmax and cHz.

[0113] In this case, the first correction motor 38 is driven sequentially using all the aHz pulse signals, bHz pulse signals, and cHz pulse signals.

[0114] Figure 11 This is a diagram showing the state when the first correction motor 38 is driven using all the aHz pulse signals, bHz pulse signals, and cHz pulse signals.

[0115] exist Figure 11In the example shown, firstly, a pulse signal of aHz drives the first calibration motor 38, causing a pair of alignment rollers 32 to move rapidly laterally (X-axis direction). Then, the frequency of the pulse signal decreases from aHz to bHz, and a bHz pulse signal drives the first calibration motor 38, reducing the lateral movement speed of the alignment rollers 32. Next, the frequency of the pulse signal decreases from bHz to cHz, and a cHz pulse signal drives the first calibration motor 38, further reducing the lateral movement speed of the pair of alignment rollers 32 (deceleration control: three stages).

[0116] In this embodiment, the frequency of the cHz pulse signal is the frequency of a vibration component that is opposite in phase to the vibration of the alignment unit 31. Therefore, when the first correction motor 38 is driven using a cHz frequency, a vibration component that is opposite in phase to the vibration of the alignment unit 31 is applied to the alignment unit 31, thereby canceling out the vibration of the alignment unit 31 and rapidly attenuating the vibration (special deceleration control).

[0117] Furthermore, when the movement of a pair of alignment rollers 32 exceeds a fixed value, the movement may take time if driven only by aHz and cHz pulse signals. Therefore, in this embodiment, a drive using bHz pulse signals is inserted between the drive using aHz pulse signals and the drive using cHz pulse signals.

[0118] Figure 12 This diagram illustrates the state when a pair of alignment rollers 32 are moved x mm laterally (X-axis direction). Here, x mm represents the amount of movement of the pair of alignment rollers 32 when a pulse number greater than Amax is input to the first correction motor 38 (that is, compared to...). Figure 9 (Corresponding movement length).

[0119] Figure 13 The diagram shows the amount of movement (vibration of alignment unit 31) of a pair of alignment rollers 32 when a pair of alignment rollers 32 are moved laterally by x mm using only an aHz pulse signal in the comparative example.

[0120] like Figure 13 As shown, when a pair of alignment rollers 32 are moved laterally by x mm using only an aHz pulse signal, vibrations (overshoot, undershoot) exceeding the allowable range will occur, and it will take time to control the vibrations within the allowable range.

[0121] Figure 14 This is a graph showing the amount of movement (vibration of the alignment unit 31) of a pair of alignment rollers 32 when they are moved laterally by x mm using a Hz pulse signal and a c Hz pulse signal (in addition to a b Hz pulse signal) in this embodiment.

[0122] like Figure 14 As shown, in this embodiment, because the frequency decreases in stages, compared to Figure 13 In the comparative example shown, the time for the pair of alignment rollers 32 to reach the target position x mm was longer. However, in this embodiment, a vibration component with an opposite phase to the vibration of the alignment unit 31 is applied to the alignment unit 31 by a cHz pulse signal, thereby canceling out the vibration of the alignment unit 31. Therefore, in this embodiment, the vibration of the alignment unit 31 decays rapidly compared to the comparative example, and the vibration is quickly controlled within the allowable range.

[0123] For example, in Figure 13 In the comparative example shown, the vibration was controlled within the allowable range at time t1, but... Figure 14 In the embodiment shown, the vibration has been controlled within the allowable range at the same time t1.

[0124] [Tilt and Offset Correction Processing]

[0125] Next, the tilt offset correction process performed by the control unit 10 will be described in detail (see reference). Figure 7 (The two images on the top side).

[0126] Figure 15 This is a flowchart illustrating the tilt offset correction process performed by the control unit 10 in this embodiment. Figures 16-18 This is a supplementary diagram used to illustrate the tilt offset correction process. Furthermore, in this embodiment, the tilt offset correction process is performed in a manner substantially the same as the lateral offset correction process described above.

[0127] In this explanation, firstly, refer to Figures 16-18 The values ​​of Dmax, Emax, Fmax, dHz, eHz, fHz, etc., which are stored in the memory of the control unit 10 as predetermined values, will be explained.

[0128] First, dHz, eHz, and fHz represent the frequencies of the pulse signals input to the second calibration motor 39 to drive it. Furthermore, they satisfy the relationship dHz > eHz > fHz. The higher the frequency of the pulse signal, the faster the pair of alignment rollers 32 rotates; therefore, the rotation speed of the pair of alignment rollers 32 increases in the order dHz > eHz > fHz.

[0129] Here, the frequency of the fHz pulse signal is the frequency of the vibration component opposite in phase to the vibration of the alignment unit 31 (the inherent vibration corresponding to the spring-mass damper component of the alignment unit 31) during tilt offset correction. That is, when the second correction motor 39 is driven at a frequency of fHz, the vibration component opposite in phase to the vibration of the alignment unit 31 is applied to the alignment unit 31, thereby canceling out the vibration of the alignment unit 31 and causing the vibration to decay rapidly. This frequency value, which can appropriately decay the vibration of the alignment unit 31 as a whole, is measured experimentally and stored in advance in memory.

[0130] Dmax (first threshold) is the upper limit of the number of pulses in a dHz pulse signal (high frequency: high speed; high, medium, and low are relative terms). In other words, a dHz pulse signal (first pulse signal) can only use a pulse count between 1 and Dmax; a pulse count greater than Dmax cannot be used.

[0131] Emax is the upper limit of the number of pulses for a pulse signal at eHz (medium frequency: medium speed for rotation; high, medium, and low are relative terms). In other words, an eHz pulse signal (the third pulse signal) can only use a number of pulses greater than 1 and less than Emax; it cannot use a number of pulses greater than Emax.

[0132] Fmax (the second threshold) is the upper limit of the number of pulses in a pulse signal of fHz (a low-frequency pulse signal used to apply opposite-phase vibrations: low speed for rotation; high, medium, and low are relative terms). In other words, the input pulse signal (the second pulse signal) of fHz can only use a number of pulses within the range of 1 or more and below Fmax; a number of pulses greater than Fmax cannot be used.

[0133] Furthermore, the relationship Dmax + Emax + Fmax = θmax is satisfied. θmax is the number of pulses corresponding to the maximum rotation of a pair of alignment rollers 32 around the Z-axis. That is, when the second correction motor 39 is input with the number of input pulses equal to θmax, the alignment roller 32 located at the reference angle (0°) rotates to its limit position around the Z-axis.

[0134] Next, refer to Figure 15 The processing of the control unit 10 will be explained below. First, the control unit 10 calculates the tilt offset 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 offset angle of the paper 2 is above a preset threshold (ST202).

[0135] If the tilt offset angle of paper 2 is less than the threshold (No in ST202), the control unit 10 ends the process. On the other hand, if the tilt offset angle of paper 2 is greater than or equal to the threshold (Yes in ST202), the control unit 10 calculates the rotation direction of the second correction motor 39 (forward rotation: +θ direction, reverse rotation: -θ direction) required to correct the tilt offset of paper 2 (ST203).

[0136] Next, the control unit 10 calculates the number of pulses M (ST204) required to be input to the second correction motor 39 to correct the tilt offset of the paper 2. Furthermore, the larger the tilt offset angle of the paper 2, the more significantly the pair of alignment rollers 32 need to rotate around the Z-axis, thus the larger the number of input pulses M becomes. Additionally, this number of input pulses M is θmax (=Dmax+Emax+Fmax) or less than the aforementioned value.

[0137] Next, the control unit 10 determines whether the number of input pulses M is less than or equal to Dmax (ST205). As described above, Dmax is the upper limit of the number of pulses in a dHz (high frequency: high speed rotation) pulse signal.

[0138] When the number of input pulses M is less than or equal to Dmax (as in ST205), the control unit 10 distributes all the input pulses M to the drive using a dHz pulse signal (ST206). Then, the control unit 10 drives the second correction motor 39 using the number of pulses M and the dHz pulse signal (ST207).

[0139] In this case, the second correction motor 39 is driven only by the dHz pulse signal, without using the eHz and fHz pulse signals.

[0140] Figure 16 This is a diagram showing the state when the second correction motor 39 is driven using only a dHz pulse signal, without using eHz and fHz pulse signals.

[0141] Here, dHz is a relatively high frequency, and the rotational speed of the pair of alignment rollers 32 around the Z-axis also becomes relatively faster. On the other hand, in Figure 16 In the example shown, the initial input pulse count M is small, and the rotation angle of the pair of alignment rollers 32 is also small. Therefore, since the vibration generated in the alignment unit 31 is also small, a pulse signal of fHz (used to apply the vibration component with opposite phase: low frequency) is not used, and the vibration of the alignment unit 31 also decays rapidly (or, does not exceed the allowable range (see reference)). Figure 20 , Figure 21 (such vibrations).

[0142] In ST205, if the number of input pulses M input to the second correction motor 39 is greater than 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 Fmax (ST208). Furthermore, as described above, Fmax is the upper limit of the number of pulses in the fHz (for applying the vibration component with opposite phase: low frequency) input pulse signal.

[0143] If the number of input pulses M is less than or equal to the sum of Dmax and Fmax (as in ST208), the control unit 10 proceeds to ST209. In ST209, the control unit 10 allocates the number of pulses corresponding to Dmax out of the total number of input pulses M to the drive using a dHz pulse signal, and allocates the remaining number of pulses (M - Dmax) to the drive using a fHz pulse signal.

[0144] Then, the control unit 10 drives the second correction motor 39 (ST210) using a pulse signal with a pulse number Dmax and dHz. After that, the control unit 10 drives the second correction motor 39 (ST211) using a pulse signal with a pulse number (M-Dmax) and fHz.

[0145] In this case, the second correction motor 39 is driven by dHz and fHz pulse signals instead of eHz pulse signals.

[0146] Figure 17 This is a diagram showing the state when the second correction motor 39 is driven using dHz and fHz pulse signals instead of eHz pulse signals.

[0147] exist Figure 17 In the example shown, firstly, a second correction motor 39 is driven using a dHz pulse signal, causing a pair of alignment rollers 32 to rotate rapidly around the Z-axis. Then, the frequency of the pulse signal is reduced from dHz to fHz, and the second correction motor 39 is driven using an fHz pulse signal, reducing the rotational speed of the alignment rollers 32 around the Z-axis (deceleration control: two-stage).

[0148] In this embodiment, the frequency of the fHz pulse signal is the frequency of a vibration component that is opposite in phase to the vibration of the alignment unit 31. Therefore, when the second correction motor 39 is driven using the fHz frequency, a vibration component that is opposite in phase to the vibration of the alignment unit 31 is applied to the alignment unit 31, thereby canceling out the vibration of the alignment unit 31 and rapidly attenuating the vibration (special deceleration control).

[0149] In ST208, if the number of input pulses M is greater than the sum of Dmax and Fmax (not in ST208), the control unit 10 proceeds to ST212. In ST212, the control unit 10 allocates the pulses corresponding to Dmax out of all the input pulses M to the drive using a dHz pulse signal, and allocates the pulses corresponding to Fmax to the drive using a fHz pulse signal. Then, the control unit 10 allocates the remaining pulses (M - Dmax - Fmax) to the drive using an eHz pulse signal.

[0150] Then, the control unit 10 drives the second correction motor 39 using a pulse signal with pulse number Dmax and dHz (ST213). Afterwards, the control unit 10 drives the second correction motor 39 using a pulse signal with pulse number (M - Dmax - Fmax) and eHz (ST214). Afterwards, the control unit 10 drives the second correction motor 39 using a pulse signal with pulse number Fmax and fHz (ST215).

[0151] In this case, the second correction motor 39 is driven sequentially using all dHz pulse signals, eHz pulse signals, and fHz pulse signals.

[0152] Figure 18 This diagram illustrates the scenario where the second corrective motor 39 is driven using pulse signals of all dHz, eHz, and fHz.

[0153] exist Figure 18 In the example shown, firstly, a dHz pulse signal drives the second correction motor 39, causing a pair of alignment rollers 32 to rotate rapidly around the Z-axis. Then, the frequency of the pulse signal decreases from dHz to eHz, and an eHz pulse signal drives the second correction motor 39, reducing the rotational speed of the alignment rollers 32 around the Z-axis. Next, the frequency of the pulse signal further decreases from eHz to fHz, and an fHz pulse signal drives the second correction motor 39, further reducing the rotational speed of the pair of alignment rollers 32 around the Z-axis (deceleration control: three stages).

[0154] In this embodiment, the frequency of the fHz pulse signal is the frequency of a vibration component that is opposite in phase to the vibration of the alignment unit 31. Therefore, when the second correction motor 39 is driven using the fHz frequency, a vibration component that is opposite in phase to the vibration of the alignment unit 31 is applied to the alignment unit 31, thereby canceling out the vibration of the alignment unit 31 and rapidly attenuating the vibration (special deceleration control).

[0155] Furthermore, when the rotation angle of a pair of alignment rollers 32 is greater than a fixed value, rotation may take time if driven only by dHz and fHz pulse signals. Therefore, in this embodiment, a drive using eHz pulse signals is inserted between the drive using dHz pulse signals and the drive using fHz pulse signals.

[0156] In this description, the operation of rotating a pair of alignment rollers 32 in such a way that the pair of alignment rollers 32 rotates from the reference angle (0°) to the target rotation angle θ° is referred to as forward rotation. Figure 7 The minimum placement diagram will be used for explanation. On the other hand, the operation of rotating a pair of alignment rollers 32 in such a way that the pair of alignment rollers 32 rotate from the target rotation angle θ° back to the reference angle (0°) will be explained (hereinafter referred to as reverse motion, see reference). Figure 7 (The second image from the top) is the same as the forward rotation except for points (1) to (2) below. Therefore, detailed explanation is omitted.

[0157] (1) In the reverse motion (return rotation), the rotation direction of the second correction motor 39 is opposite to that of the forward rotation. (2) In the reverse motion, it is only necessary to make the rotation direction opposite to the previous forward rotation and perform the same action as the forward rotation. Therefore, it is not necessary to calculate ST201~206, ST208~209, ST212, etc. that have already been calculated.

[0158] Figure 19 This diagram illustrates the state when a pair of alignment rollers 32 are rotated about the Z-axis by a target rotation angle θ°. Furthermore, the rotation angle θ° here is the rotation angle of the pair of alignment rollers 32 when a pulse number greater than Dmax is input to the second correction motor 39 (that is, compared to...). Figure 16 (The corresponding rotation angle is large).

[0159] Figure 20 This is a graph showing the rotation angle (vibration of alignment unit 31) of a pair of alignment rollers 32 when a pair of alignment rollers 32 are rotated θ° around the Z-axis using only a dHz pulse signal in the comparative example.

[0160] like Figure 20 As shown, when a pair of alignment rollers 32 are rotated θ° around the Z-axis using only a dHz pulse signal, vibrations (overshoot, undershoot) exceeding the allowable range will occur, and it will take time to control the vibrations within the allowable range.

[0161] Figure 21 This is a graph showing the rotation angle (vibration of the alignment unit 31) of a pair of alignment rollers 32 when they are rotated θ° around the Z-axis using dHz pulse signals and fHz pulse signals (in addition to bHz pulse signals) in this embodiment.

[0162] like Figure 21 As shown, in this embodiment, because the frequency decreases in stages, compared to Figure 20 In the comparative example shown, the time it takes for the pair of alignment rollers 32 to reach the rotation angle θ° is longer. However, in this embodiment, a vibration component with an opposite phase to the vibration of the alignment unit 31 is applied to the alignment unit 31 by a pulse signal of fHz, thereby canceling out the vibration of the alignment unit 31. Therefore, in this embodiment, the vibration of the alignment unit 31 decays rapidly compared to the comparative example, and the vibration is quickly controlled within the allowable range.

[0163] For example, in Figure 20 In the comparative example shown, the vibration was controlled within the allowable range at time t2, but... Figure 21 In the embodiment shown, at the same time t2, the vibration has been controlled within the allowable range.

[0164] In addition, Figures 19-21 The text explains forward rotation, and the same applies to reverse rotation (returning rotation).

[0165] <Functions, etc.>

[0166] As explained above, in this embodiment, when the paper 2 is offset corrected by a pair of alignment rollers 32, the speed of the movement (lateral movement, rotation) of the pair of alignment rollers 32 is reduced in stages (deceleration control). Furthermore, finally, the frequency (cHz, fHz) of the pulse signal used to drive the correction motor is a frequency that can apply (cause it to generate) a vibration component that is opposite in phase to the vibration of the alignment unit 31 (special deceleration control).

[0167] Therefore, the vibration component with the opposite phase to the vibration applied to the alignment unit 31 is canceled out, and the vibration decays rapidly. That is, in this embodiment, the vibration of the alignment unit 31 during the offset correction of the paper 2 can be rapidly decayed while shortening the time spent on the offset correction of the paper 2.

[0168] Therefore, in this embodiment, even when the distance between the alignment section 30 (alignment roller 32) and the processing section 40 (processing position) is small, the paper 2 can be supplied to the processing section 40 within the allowable vibration range. Thus, it is possible to prevent a decrease in the quality (image quality, printing quality, etc.) of the processing section 40 on the paper 2.

[0169] Furthermore, in this embodiment, the time spent waiting for the vibration of the alignment unit 31 to be controlled after the offset correction process can be shortened (e.g., less than 30 ms) (or the waiting time itself can be eliminated). Additionally, in this embodiment, offset correction can be performed with an accuracy of 0.1 mm.

[0170] <Various variations>

[0171] The above explanation addresses the case where the (special) deceleration control has a maximum of three stages. However, this number of stages can be adjusted as needed.

[0172] In the above description, the case where special deceleration control is performed in both lateral offset correction processing and tilt offset correction processing has been described, but special deceleration control can be performed in either one. Furthermore, in this embodiment, the case where special deceleration control is performed in both forward rotation and reverse rotation (return rotation) during tilt offset correction processing has been described, but special deceleration control can be performed in either one.

[0173] In the above explanation, the cases where the values ​​of the frequencies cHz and fHz (used to apply vibration components of opposite phase) are fixed were described. On the other hand, the values ​​of the frequencies cHz and fHz can also be controlled variably. For example, the value of the frequency cHz can also be variably controlled based on the amount of movement of the pair of alignment rollers 32 during lateral offset correction. Furthermore, for example, the value of the frequency fHz can also be variably controlled based on the rotation angle of the pair of alignment rollers 32 during tilt offset correction. In this case, the vibration of the alignment unit 31 can be attenuated more accurately and quickly.

[0174] In the above description, 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 can also be, for example, metal, resin, cloth, wood, etc.

Claims

1. An electronic device comprising an alignment unit and a control unit, The alignment unit includes: An alignment roller supplies the recording medium to the processing unit that processes the recording medium; a calibration motor actuates the alignment roller to correct any misalignment of the recording medium. After driving the calibration motor with a first pulse signal having a first frequency, the control unit drives the calibration motor with a second pulse signal having a second frequency, the second frequency being a frequency lower than the first frequency and being a frequency capable of applying a vibration component with a phase opposite to the vibration of the alignment unit to the alignment unit.

2. The electronic device according to claim 1, wherein, After the control unit drives the correction motor using the first pulse signal and before it drives the correction motor using the second pulse signal, it drives the correction motor using a third pulse signal with a third frequency, the third frequency being lower than the first frequency and higher than the second frequency.

3. The electronic device according to claim 2, wherein, The control unit determines whether the number of input pulses required to correct the offset of the recording medium is below a first threshold. If the number of input pulses is below the first threshold, the second pulse signal and the third pulse signal are not used, and the correction motor is driven by the first pulse signal instead.

4. The electronic device according to claim 3, wherein, When the number of input pulses is below the first threshold, the control unit allocates all of the input pulses to the drive performed using the first pulse signal.

5. The electronic device according to claim 4, wherein, The first threshold is an upper limit on the number of pulses allocated to the drive using the first pulse signal.

6. The electronic device according to claim 3, wherein, If the number of input pulses required to correct the offset of the recording medium is greater than the first threshold, the control unit determines whether the number of input pulses is less than or equal to the sum of the first threshold and the second threshold. If the number of input pulses is less than or equal to the sum of the first threshold and the second threshold, the control unit does not use the third pulse signal, but drives the correction motor using the first pulse signal and the second pulse signal.

7. The electronic device according to claim 6, wherein, When the number of input pulses is less than or equal to the total value, the control unit allocates the number of pulses in the number of input pulses corresponding to the first threshold to the drive performed using the first pulse signal, and allocates the remaining number of pulses corresponding to the number after subtracting the first threshold from the number of input pulses to the drive performed using the second pulse signal.

8. The electronic device according to claim 7, wherein, The second threshold is an upper limit on the number of pulses allocated to the drive using the second pulse signal.

9. The electronic device according to claim 6, wherein, If the number of input pulses required to correct the offset of the recording medium is greater than the total value, the control unit drives the correction motor through the first pulse signal, the second pulse signal, and the third pulse signal.

10. The electronic device according to claim 9, wherein, If the number of input pulses is greater than the total value, the control unit allocates the number of pulses corresponding to the first threshold from the number of input pulses to the drive using the first pulse signal, allocates the number of pulses corresponding to the second threshold to the drive using the second pulse signal, and allocates the remaining number of pulses corresponding to the number obtained by subtracting the first threshold and the second threshold from the number of input pulses to the drive using the third pulse signal.

11. The electronic device according to any one of claims 1 to 10, wherein, The correction motor includes a first correction motor that moves the alignment roller to correct lateral offset of the recording medium.

12. The electronic device according to any one of claims 1 to 10, wherein, The correction motor includes a second correction motor that rotates the alignment roller to correct the tilt offset of the recording medium.

13. An alignment unit, comprising: alignment A roller that supplies the recording medium to a processing unit that processes the recording medium; And a calibration motor, which enables the alignment rollers to move to correct for 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, which is a frequency lower than the first frequency and is a frequency capable of applying a vibration component that is opposite in phase to the vibration of the alignment unit.

14. A driving method for an alignment unit, The alignment unit includes: An alignment roller supplies the recording medium to a processing unit that processes the recording medium. And a calibration motor, which enables the alignment rollers to move to correct for misalignment of the recording medium. After driving the calibration motor with a first pulse signal having a first frequency, the calibration motor is driven with a second pulse signal having a second frequency, the second frequency being a frequency lower than the first frequency, and capable of applying a vibration component with a phase opposite to the vibration of the alignment unit to the alignment unit.

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