JP2007160847A - Recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording device by which the carrying accuracy of a recording medium can be improved by improving the fluctuation of rotation quality of a stepping motor during the conveying action of the recording medium of each time. <P>SOLUTION: The stepping motor is used as an LF motor 10 for dividing a medium conveying roller. A power dividing section 22 drives the LF motor 10 by changing the excitation phase condition of the LF motor 10 in series. A controller dividing section 21 controls the power driving section 22 while controlling the excitation phase condition of the LF motor 10. A CPU 70 makes the power driving section 22 function off condition, initializes the excitation phase condition of the LF motor 10 controlled by the controller dividing section 21, thereafter returns the power dividing section 22 to function on condition every time when medium conveying action of one time is completed. Thereby, the LF motor 10 always acts from the predetermined position determined by the initial condition of the excitation phase at the start of the medium conveying action of each time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a recording apparatus using a stepping motor as a drive motor for driving a medium transport mechanism for transporting a recording medium.

  An ink jet recording apparatus performs recording on a recording medium by alternately repeating an operation of conveying a recording medium (recording paper) and an operation of ejecting ink from the recording head by reciprocating a carriage on which the recording head is mounted. Do. Such a recording apparatus is provided with a carriage motor for moving the carriage and a conveyance motor for driving a medium conveyance mechanism for conveying the recording medium. Since the carriage motor and the conveyance motor operate relatively frequently during the recording operation, a DC servo motor may be adopted as the carriage motor and the conveyance motor to suppress noise during the operation of these motors. However, the DC servo motor is more expensive than the stepping motor, which increases the cost of the entire apparatus. For this reason, in general, in an ink jet recording apparatus, a stepping motor is employed as a carriage motor or a conveyance motor, thereby reducing the cost of the entire apparatus.

  Conventionally, in a recording apparatus using a stepping motor as a transport motor, in order to improve deterioration of paper transport accuracy due to a stepping motor shake, driving is performed by the 1-2 phase excitation method at low speed driving, and at high speed driving. There is one to which a drive control method of a stepping motor that drives by a two-phase excitation method is applied (for example, see Patent Document 1).

JP 2000-25978 A

  By the way, in general, the stepping motor stop angle depends on variations in internal materials at the time of manufacturing the stepping motor, tolerances in material processing, gaps in the assembly of the rotor and stator, and variations in the performance of the electrical components included in the stepping motor and driver. Have variations. For this reason, a step angle error occurs when the stepping motor is stopped, and the rotation amount of the stepping motor during each recording medium conveyance operation also varies, which may cause deterioration in the conveyance accuracy of the recording medium. There is. That is, as described above, even if the driving method is changed in accordance with the rotation speed of the stepping motor, if the variation in the rotation amount of the stepping motor is not improved during each recording medium conveyance operation, the recording medium is stopped. Position accuracy is limited.

  The present invention has been made based on the above circumstances, and provides a recording apparatus capable of improving the recording medium conveyance accuracy by improving the variation in the rotation amount of the stepping motor during each recording medium conveyance operation. It is intended to provide.

  In order to achieve the above object, an invention according to claim 1 includes: a recording head that discharges ink; a carriage that mounts the recording head; and a medium transport mechanism that transports the recording medium. In the recording apparatus for recording an image on the recording medium by alternately performing a printing operation for ejecting ink from the recording head while moving and a medium conveying operation for conveying the recording medium by a predetermined amount by the medium conveying mechanism, A stepping motor for driving the medium transport mechanism, power driving means for driving the stepping motor by sequentially changing the excitation phase state of the stepping motor, and the power driving while managing the excitation phase state of the stepping motor Controller driving means for controlling the means, the controller driving means and the power drive Control means for controlling the medium conveying operation by controlling the means, and performing processing for initializing the excitation phase state of the stepping motor managed by the controller driving means each time one medium conveying operation is completed. It is characterized by comprising.

  According to a second aspect of the present invention, in the recording apparatus according to the first aspect, when the control means performs a process of initializing the excitation phase state of the stepping motor managed by the controller driving means, the power driving means is The function is turned off, the excitation phase state of the stepping motor managed by the controller driving means is initialized, and then the power driving means is returned to the function on state.

  According to the first aspect of the present invention, the control means performs a process of initializing the excitation phase state of the stepping motor managed by the controller driving means every time one medium transport operation is completed. Thus, the control means controls the next medium transport operation after initializing the excitation phase state of the stepping motor. For this reason, at the start of each transport operation, the stepping motor always operates from a predetermined position determined by the initial state of the excitation phase, so even if the stop angle of the stepping motor varies, each step of transporting the medium The amount of rotation of the stepping motor during operation can be made constant at all times. Therefore, it is possible to improve the conveyance accuracy of the recording medium and realize a more stable printing operation. The initial state of the excitation phase set by the control means by initializing the excitation phase state of the stepping motor is such that the stepping motor operates from a predetermined rotational angle position without a stop angle error in the next movement step. It is desirable that

  According to the second aspect of the present invention, when performing the process of initializing the excitation phase state of the stepping motor managed by the controller driving unit, the control unit sets the power driving unit to the function off state and manages the stepping managed by the controller driving unit. The motor excitation phase state is initialized, and then the power drive means is returned to the function-on state. Thereby, it is possible to reliably prevent the stepping motor from moving or stepping out during the initialization process.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a schematic block diagram of a recording apparatus according to an embodiment of the present invention.

  The recording apparatus according to the present embodiment is, for example, an ink jet recording apparatus, and performs a medium transport operation for transporting a recording medium by a certain distance (distance for one pass) and printing that ejects ink from the recording head while moving the carriage. An image is recorded on a recording medium by alternately repeating the operation. In particular, in this recording apparatus, a stepping motor (pulse motor) is used as an LF motor (Line Feed Motor) for conveying a recording medium. The feature of the present invention is that the accuracy of transporting the recording medium can be improved by improving the variation in the rotation amount of the stepping motor during the transporting operation of the recording medium each time. Therefore, the following description will focus on matters relating to the control of the medium transport system including the LF motor. For this reason, FIG. 1 also shows only the medium transport system including the LF motor and the control system that controls the medium transport system.

  As shown in FIG. 1, the recording apparatus of the present embodiment includes an LF motor 10, an LF motor driver 20, an LF code wheel 30, an LF rotary encoder 40, an operation panel 50, an ASIC 60 that is a custom IC, CPU (control means) 70 is provided.

  The LF motor 10 is for rotationally driving a medium transport roller (not shown) that is a medium transport mechanism. As this LF motor 10, a stepping motor is used. In particular, in this embodiment, a case where a two-phase stepping motor is used will be described. The recording medium is placed on a medium conveying roller, and the recording medium is fed by a predetermined amount as the medium conveying roller rotates.

  The LF motor driver 20 is a driver that drives the LF motor 10. Here, consider a case where the LF motor 10 is unipolarly driven. Further, as the excitation method of the LE motor 10, there are methods such as one-phase excitation, two-phase excitation, and 1-2 phase excitation. In the present embodiment, the LE motor 10 is driven by a two-phase excitation method. As shown in FIG. 1, the LF motor driver 20 includes a controller driving unit 21 and a power driving unit 22. The power drive unit 22 drives the LF motor 10 by sequentially changing the excitation phase state of the LF motor 10, and the controller drive unit 21 manages the excitation phase state of the LF motor 10 while controlling the excitation phase state. Is to control. Specifically, the controller driving unit 21 sets two sets of windings of the LF motor 10 based on four control signals (A phase signal, / A phase signal, B phase signal, and / B phase signal) sent from the ASIC 60. A signal for sequentially switching currents flowing through the lines (total of four windings) is sent to the power driving unit 22. The power drive unit 22 amplifies a current from a DC power supply (not shown) to a current having a predetermined drive current value, and the amplified current is supplied to the LF motor 10 according to a signal sent from the controller drive unit 21. Flow through the four windings in a predetermined order.

  In the present embodiment, the LF motor driver 20 drives the LF motor 10 by a microstep driving method. This micro-step driving method is a driving method in which the basic step angle of the motor, which is mechanically determined, is further divided and the motor is gradually rotated at the divided minute step angle. The controller drive unit 21 also plays a role of controlling the microstep drive. Specifically, the controller drive unit 21 controls the current value flowing in the excitation phase so as to gradually increase the current value of one phase of the excitation phase and gradually decrease the current value of the other phase. A small step angle is generated. The LF motor 10 can be smoothly rotated by driving the LF motor 10 by the microstep driving method.

  By the way, in general, the stepping motor stop angle depends on variations in internal materials at the time of manufacturing the stepping motor, tolerances in material processing, gaps in the assembly of the rotor and stator, and variations in the performance of the electrical components included in the stepping motor and driver. Have variations. However, the stepping motor can be accurately stopped at a position corresponding to a mechanically determined basic step angle, for example, a position corresponding to a rotation angle such as 45 degrees. That is, this position is a rotation angle position at which the stepping motor can stop without having a stop angle error.

  The LF code wheel 30 is used to detect information related to the angle at which the medium transport roller rotates (thus, information related to the distance that the recording medium has been transported). The LF code wheel 30 is attached to a surface perpendicular to the rotation axis of the medium transport roller. A plurality of marks and the like are formed on the surface of the LF code wheel 30 at regular intervals along the outer periphery thereof. The LF rotary encoder 40 outputs an A phase signal (chA) and a B phase signal (chB) having a phase difference of 90 degrees obtained by reading the LF code wheel 30. Therefore, the A-phase signal and the B-phase signal from the LF rotary encoder 40 are always output as long as the medium transport roller is rotating, and are not output when the medium transport roller is stopped. The A-phase signal and the B-phase signal are used to know the rotational movement amount and the rotation direction of the medium transport roller.

  The CPU 70 supervises control of each unit. Specifically, the CPU 70 controls the medium conveyance operation by controlling the LF motor driver 20, and also controls the printing operation by controlling the movement of the carriage and the ink ejection operation from the recording head. The CPU 70 includes a ROM 71, a RAM 72, and a DAC 73. The ROM 71 stores various control programs executed by the CPU 70. The RAM 72 is a memory used as a working / temporary memory area.

  The DAC 73 is a digital / analog converter that converts a digital signal representing a drive current value of the LF motor 10 into an analog signal. That is, when the CPU 70 sets a digital signal representing a predetermined drive current value in the DAC 73, the DAC 73 sends an analog signal corresponding to the set digital signal to the Vref of the LF motor driver 20. As a result, the drive current value is set in the controller drive unit 21 of the LF motor driver 20.

  The operation panel 50 performs various settings such as an operating environment. The operation panel 50 is provided with a power switch for switching power ON / OFF, a switch for switching ONLINE / OFFLINE, various setting buttons, a display unit, and the like. This display unit is composed of an LCD or LED, and specifically displays a setting menu, the status of the recording apparatus, and the like.

  The ASIC 60 is a dedicated control circuit for controlling the LF motor driver 20 under the control of the CPU 70. Specifically, when the ASIC 60 receives a rotation command (drive pulse signal) from the CPU 70, the ASIC 60 decodes the drive pulse signal into four control signals: an A phase signal, an / A phase signal, a B phase signal, and a / B phase signal. These control signals are output to the LF motor driver 20. Here, the phases of the A phase signal and the / A phase signal, and the B phase signal and the / B phase signal are shifted by 180 degrees. On the other hand, the phases of the A phase signal and the B phase signal are shifted by 90 degrees. The LF motor driver 20 rotates the LF motor 10 by causing the current of the drive current value input from Vref to flow through each winding of the LF motor 10 based on the control signal. Here, the number of rotations (speed) of the LF motor 10 is determined by the switching period of the driving pulse, while the driving torque of the LF motor 10 is determined by the driving current value set in the LF motor driver 20 by the CPU 70. The ASIC 60 also plays a role of acquiring information related to the rotational movement amount of the medium transport roller based on the A phase signal and the B phase signal from the LF rotary encoder 40.

  As shown in FIG. 1, the ASIC 60 includes first count means 61 and second count means 62.

  The first counting means 61 counts the number of output signals for each of the four control signals each time the control signals are output. That is, the first counting means 61 counts the number of moving steps of the LF motor 10. The second counting means 62 counts the number of transmitted signals every time an A-phase signal and a B-phase signal are transmitted from the LF rotary encoder 40. That is, the second counting unit 62 counts a value corresponding to the rotational movement amount of the medium transport roller. Usually, the count value of the first count means 61 that is the number of movement steps of the LF motor 10 and the count value of the second count means 62 that represents the rotational movement amount of the medium transport roller have a one-to-one correspondence.

  Information about the count value of the first count means 61 and the count value of the second count means 62 is sent from the ASIC 60 to the CPU 70. The CPU 70 controls the LF motor 10 based on information about these count values. Specifically, since the CPU 70 can know the rotational movement amount of the medium transport roller, and hence the transport amount of the recording medium, from the count value of the second count means 62, the stop control of the LF motor 10 is performed based on the count value. I do.

  In the present embodiment, the CPU 70 performs a process of initializing the excitation phase state of the LF motor 10 managed by the controller driving unit 21 every time one medium transport operation is completed. In order to perform such processing, the CPU 70 sends a command to the ASIC 60 and sends a DrvEnable signal and a DrvReset signal from the ASIC 60 to the LF motor driver 20. Specifically, the DrvEnable signal is sent to the power driver 22 and the DrvReset signal is sent to the controller driver 21.

  The DrvEnable signal is a signal for controlling the operating state of the power driving unit 22. That is, when “0” is input to the power driver 22 as the DrvEnable signal, the power driver 22 is turned off. Thereby, LF motor 10 will be in a non-excitation state. On the other hand, when “1” is input to the power driver 22 as the DrvEnable signal, the power driver 22 is turned on.

  The DrvReset signal is a signal for initializing the excitation phase state of the LF motor 10 managed by the controller drive unit 21. Here, the excitation phase state of the LF motor 10 managed by the controller drive unit 21 is information of contents such as how much current is passed through which winding in the next movement step. When “0” is input to the controller drive unit 21 as the DrvReset signal, the excitation phase state of the LF motor 10 managed by the controller drive unit 21 is initialized. In this embodiment, the CPU 70 initializes the excitation phase state of the LF motor 10 and sets the initial state of the excitation phase. For example, the excitation phase is A phase and B phase, and each of the A phase and B phase is 71%. The content is that the current value flows. That is, the initial state of the excitation phase is such that the LF motor 10 operates from the position of the rotation angle of 45 degrees in the next movement step. The position where the rotation angle is 45 degrees is a rotation angle position where the stepping motor stops accurately without having a stop angle error, as described above. On the other hand, when “1” is input to the controller drive unit 21 as the DrvReset signal, the controller drive unit 21 is in a controllable state of the power drive unit 22.

  The CPU 70 first sets the power driving unit 22 to the function-off state after the current medium transporting operation and the printing operation are completed and before starting the next medium transporting operation, and then manages the controller driving unit 21. The excitation phase state of the LF motor 10 to be initialized is initialized, and then the power drive unit 22 is returned to the function-on state. As a result, the CPU 70 controls the next medium transport operation after initializing the excitation phase state of the LF motor 10. Specifically, first, the ASIC 60 outputs a DvrEnable signal “0” to the power driving unit 22 in accordance with an instruction from the CPU 70 to put the power driving unit 22 in a function-off state. Next, a DrvReset signal “0” is output to the controller drive unit 21. As a result, the excitation phase state managed by the controller drive unit 21 is initially set to the content that the LF motor 10 operates from a position at a rotation angle of 45 degrees in the next movement step (movement step at the start of the next medium transport operation). It becomes. Thereafter, the ASIC 60 outputs a DrvEnable signal “1” to the power driving unit 22 and outputs a DrvReset signal “1” to the controller driving unit 21 in order to permit the operation of the LF motor 10. As described above, the CPU 70 initializes the excitation phase state of the LF motor 10 managed by the controller driving unit 21 every time the medium transport operation is completed, so that the LF motor is started at the start of each medium transport operation. 10 always operates from a position at a rotation angle of 45 degrees that does not have a stop angle error. Therefore, even if there is a variation in the stop angle of the LF motor 10, the rotation amount of the LF motor 10 during each transport operation can be reduced. Can always be constant.

  By the way, if the excitation phase state of the LF motor 10 managed by the controller drive unit 21 is initialized without setting the power drive unit 22 in the function off state, the LF motor 10 may move at that time. In some cases, the LF motor 10 may step out. For this reason, in the present embodiment, as described above, the excitation phase state of the LF motor 10 is initialized after the power drive unit 22 is turned off. Further, when the power drive unit 22 is turned off, the LF motor 10 is in a non-excited state, so that it can move freely. However, since the control by the DrvEnable signal and the DrvReset signal is performed within a very short period (for example, a period on the order of microseconds), the power driving unit 22 is temporarily turned off during the control. However, the LF motor 10 does not move without permission.

  Next, a procedure in which the CPU 70 controls the driving of the LF motor 10 in the recording apparatus of the present embodiment will be described. FIG. 2 is a flowchart for explaining a procedure by which the CPU 70 controls the driving of the LF motor 10 in the recording apparatus of the present embodiment.

  Immediately after the recording apparatus is powered on, the drive current value of the LF motor 10 is 0, and the LF motor 10 is in a non-excited state, that is, in a standby state. At this time, the CPU 70 performs processing according to the initialization sequence when the power is turned on. That is, the CPU 70 controls the ASIC 60 and first outputs the DrvEnable signal “0” to the power drive unit 22 of the LF motor driver 20 and then outputs the DrvReset signal “0” to the controller drive unit 21 of the LF motor driver 20. To do. Next, after outputting a DrvEnable signal ‘1’ to the power driver 22, a DrvReset signal ‘1’ is output to the controller driver 21. As a result, the excitation phase state managed by the controller drive unit 21 is set such that the excitation phases are the A phase and the B phase, and a current value of 71% flows in the A phase and the B phase, respectively. In the next movement step, the operation is performed from a position at a rotation angle of 45 degrees having no stop angle error.

  Next, the CPU 70 sets a predetermined drive current value A in the controller drive unit 21 via the DAC 73 (S1). Further, the CPU 70 sets the frequency of the drive pulse signal to the predetermined frequency f (S2). Then, the CPU 70 starts the first medium transport operation by sending a drive pulse signal having the frequency f to the ASIC 60 (S3). Specifically, the ASIC 60 outputs four control signals, which are obtained by decoding the drive pulse signal, which are an A phase signal, an / A phase signal, a B phase signal, and a / B phase signal, to the controller drive unit 21. The controller driving unit 21 controls the power driving unit 22 based on the control signal, so that the power driving unit 22 drives the LF motor 10. At this time, the LF motor 10 operates from a position at a rotation angle of 45 degrees, whereby the medium transport roller rotates.

  While the LF motor 10 is rotating, the first count means 61 of the ASIC 60 counts the number of output signals each time an A-phase signal, an / A-phase signal, a B-phase signal, and a / B-phase signal are output. Count. On the other hand, while the LF motor 10 is rotating, the LF rotary encoder 40 outputs the A phase signal and the B phase signal to the ASIC 60. The second counting means 62 of the ASIC 60 counts the number of transmitted signals each time such A phase signal and B phase signal are transmitted. Information about the count value of the first count means 61 and the count value of the second count means 62 is sent from the ASIC 60 to the CPU 70.

  Next, the CPU 70 determines whether or not to end the current medium transport operation (S4). This determination is made based on the count value of the second count means 62 sent from the ASIC 60. That is, when the CPU 70 determines that the count value of the second count means 62 has reached a preset reference value, the CPU 70 recognizes that the recording medium has been transported by a distance corresponding to one pass, and performs the current medium transport operation. finish. Thereby, the driving of the LF motor 10 is stopped. Thereafter, the CPU 70 determines whether all the recording operations are completed (S5). If it is determined that the recording operation is not yet completed, the process proceeds to step S6.

  By the way, when the LF motor 10 is stopped in this way, the excitation phase state managed by the controller drive unit 21 is usually different from the excitation phase state before the start of the current medium transport operation, and the LF motor 10 is also in this state. This stop position is not necessarily an angular position having no stop angle error. For this reason, the LF motor 10 stops with a certain stop angle error. Thus, since the LF motor 10 is stopped with an error with respect to the target stop position, if the LF motor 10 is operated from the stop position in the next medium transport operation, the medium transport is performed. An error also occurs in the stop position of the LF motor 10 after the operation ends. That is, due to the variation in the stop angle of the LF motor 10, the amount of rotation of the LF motor 10 during each medium conveyance operation also varies, and the conveyance accuracy of the recording medium deteriorates. In the present embodiment, by performing the processing from step S6 to step S9 in the processing flow of FIG. 2, the variation in the rotation amount of the LF motor 10 during each medium transport operation is improved.

  In step S <b> 6, the CPU 70 controls the ASIC 60 after the printing operation performed after the current medium conveyance operation is completed, and outputs a DrvEnable signal “0” from the ASIC 60 to the power driving unit 22. As a result, the power driving unit 22 is turned off. Next, the CPU 70 controls the ASIC 60 and outputs a DrvReset signal “0” from the ASIC 60 to the controller driving unit 21 (S7). As a result, the excitation phase state managed by the controller drive unit 21 is initialized, and the excitation phase is set to the contents of the A phase and the B phase, and a current value of 71% is supplied to each of the A phase and the B phase. The Therefore, the LF motor 10 does not move, and always operates from a position at a rotation angle of 45 degrees having no stop angle error during the next medium transport operation.

  Next, the CPU 70 controls the ASIC 60, outputs a DrvEnable signal '1' from the ASIC 60 to the power driver 22 (S8), and outputs a DrvReset signal '1' from the ASIC 60 to the controller driver 21 (S9). . Thereby, the operation of the LF motor 10 is permitted. Thereafter, the process proceeds to step S3.

  When the next medium transport operation is started by the processing in step S3, as described above, the LF motor 10 operates from a position at a rotation angle of 45 degrees without a stop angle error. Then, after repeating the process from step S3 to step S9 several times, if the CPU 70 determines in step S5 that all recording operations have been completed, the process flow of FIG. 2 ends.

  In the recording apparatus according to the present embodiment, the CPU first turns off the power drive unit after the current medium transport operation and the printing operation are completed and before the next medium transport operation is started. Then, the excitation phase state of the LF motor managed by the controller drive unit is initialized, and then the power drive unit is returned to the function-on state. As a result, the CPU controls the next medium transport operation after initializing the excitation phase state of the LF motor. For this reason, at the start of each medium conveyance operation, the LF motor always operates from a predetermined position determined by the initial state of the excitation phase. Therefore, even if the stop angle of the LF motor varies, each medium The amount of rotation of the LF motor during the conveying operation can always be kept constant. Therefore, it is possible to improve the conveyance accuracy of the recording medium and realize a more stable printing operation.

  In addition, this invention is not limited to said embodiment, A various deformation | transformation is possible within the range of the summary.

  For example, in the above-described embodiment, the case where the LF motor operates from the position of the rotation angle of 45 degrees at the start of each medium conveyance operation has been described. However, the LF motor always has a constant rotation angle at the start of each medium conveyance operation. If it operates from the position, the rotation angle position does not necessarily have to be a rotation angle of 45 degrees.

  As described above, according to the present invention, the control unit performs the process of initializing the excitation phase state of the stepping motor managed by the controller driving unit every time one medium transport operation is completed. Thus, at the start of each transport operation, the stepping motor always operates from a predetermined position determined by the initial state of the excitation phase. The amount of rotation of the stepping motor during operation can be made constant at all times. For this reason, the conveyance accuracy of the recording medium can be improved, and a more stable printing operation can be realized. Therefore, the present invention can be applied to various recording apparatuses such as an ink jet recording apparatus.

1 is a schematic block diagram of a recording apparatus according to an embodiment of the present invention. 5 is a flowchart for explaining a procedure by which a CPU controls driving of an LF motor in the recording apparatus of the present embodiment.

Explanation of symbols

10: LF motor, 20: LF motor driver, 21: controller driving unit, 22: power driving unit, 30: LF code wheel, 40: LF rotary encoder, 50: operation panel, 60: ASIC, 61: first counting means 62: Second counting means, 70: CPU, 71: ROM, 72: RAM, 73: DAC

Claims (2)

A printing operation for ejecting ink from the recording head while moving the carriage, and a medium having a recording head for ejecting ink, a carriage on which the recording head is mounted, and a medium conveying mechanism for conveying the recording medium In a recording apparatus for recording an image on the recording medium by alternately performing a medium conveying operation for conveying the recording medium by a predetermined amount by a conveying mechanism,
A stepping motor for driving the medium transport mechanism;
Power driving means for driving the stepping motor by sequentially changing the excitation phase state of the stepping motor;
Controller driving means for controlling the power driving means while managing the excitation phase state of the stepping motor;
The medium driving operation is controlled by controlling the controller driving means and the power driving means, and the excitation phase state of the stepping motor managed by the controller driving means is initialized every time one medium conveying operation is completed. Control means for performing processing to be
A recording apparatus comprising: The control means, when performing the process of initializing the excitation phase state of the stepping motor managed by the controller driving means, sets the power driving means to the function off state, and controls the stepping motor managed by the controller driving means. The recording apparatus according to claim 1, wherein an excitation phase state is initialized, and thereafter, the power driving unit is returned to a function-on state.

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