JP2004048876A - Apparatus and method for controlling drive mechanism, recorder, and method for controlling recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate a positional deviation at a restarting time even when holding current to a motor is cut. <P>SOLUTION: When a motor drive mechanism having a stepping motor as a drive source in which a holding current for holding a position of a rotor is supplied, is used as a drive source at a standby time, the rotor is rotated by a predetermined amount in a first direction so as to relax a force to be received by the rotor from a drive load when the supply of the holding current is stopped, an exciting phase after the force is relaxed is stored, and the supply of the holding current is stopped after the storage. The stepping motor is re-energized in an exciting phase stored at the re-starting time of the stepping motor, the rotor is rotated in an amount rotated in a second direction of a reverse direction to the first direction, and the position of the rotor is reset. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a driving mechanism control device, a driving mechanism control method, a recording device, and a recording device control method.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an International Energy Star Program has been known as a registration system for products that conform to energy-saving standards for products such as computers, displays, printers, facsimiles, and copiers. This International Energy Star program requires that the power consumption during standby be reduced to 30 [W] or less. However, if the power consumption during standby is 30 [W] or less, it is not sufficient power saving. Further regulation was desired.
[0003]
In order to cope with this, in a printer as a recording device, a device that cuts a hold current of a motor when a state in which print data is not received for a certain period of time and further reduces power consumption during standby has been proposed. .
[0004]
[Problems to be solved by the invention]
However, if the hold current of the paper feed motor is cut with the medium (sheet) set, the phase of the motor shifts due to the back tension of the sheet and the like. There was a problem that it shifted.
[0005]
Here, the shift of the sheet position will be described in detail with reference to the drawings.
[0006]
FIGS. 10 and 11 are explanatory diagrams showing the relationship between the rotor and the stator of the paper feed motor when the medium is not set (no medium, no back tension).
[0007]
FIG. 10 is an explanatory diagram showing the relationship between the rotor and the stator of the paper feed motor during energization (two-phase excitation method).
[0008]
As shown in FIG. 10, when power is supplied and the medium is not set, the S pole of the permanent magnet forming the rotor is stabilized at, for example, an intermediate point between the coils A and B forming the N pole. Similarly, the north pole of the permanent magnet is stabilized at, for example, an intermediate point between the coils C and D constituting the south pole.
[0009]
FIG. 11 is a diagram illustrating the relationship between the rotor and the stator of the paper feed motor when power is not supplied.
[0010]
As shown in FIG. 11, when power is not supplied and the medium is not set, the permanent magnets constituting the rotor attract the cores of the coils constituting the stator (coils A and C in FIG. 11) and are in a stable state. It has become.
[0011]
On the other hand, when a medium is set, back tension occurs due to the medium.
[0012]
Next, the control of the paper feed motor drive mechanism of the conventional printer will be described including the relationship between the rotor and the stator when setting the medium.
[0013]
FIG. 12 shows a processing flowchart of control processing of a paper feed motor driving mechanism of a conventional printer.
[0014]
Conventionally, regardless of the presence or absence of a sheet as a medium or the forms override area which is a printable area of a medium after no medium is detected, if no print data is received for n minutes or more, In this case, the excitation phase of the paper feed motor is stored and the hold current of the paper feed motor is cut.
[0015]
FIG. 13 to FIG. 15 are explanatory diagrams showing the relationship between the rotor and the stator of the paper feed motor when setting the medium.
[0016]
More specifically, first, after the printing operation is performed, if the paper is fed clockwise in FIG. 13, the S pole of the permanent magnet constituting the rotor is, for example, a coil constituting the N pole. It stabilizes at the midpoint between A and coil B. Similarly, the north pole of the permanent magnet is stabilized at, for example, an intermediate point between the coils C and D constituting the south pole.
[0017]
Then, when the print data is no longer received, the MPU (not shown) of the printer supplies a hold current to the paper feed motor, and tries to hold the rotor in a state where printing is stopped.
[0018]
However, in this case, since the medium is set, the rotor is rotated counterclockwise by the back tension. For example, as shown in FIG. 13, the S pole of the permanent magnet constituting the rotor is , The coil A constituting the north pole and the coil D constituting the south pole are stabilized, and the north pole of the permanent magnet is stabilized between the coil B constituting the north pole and the coil C constituting the south pole. Will be done.
[0019]
In this state, the MPU (not shown) of the printer determines whether or not the state in which print data is not received has continued for a predetermined n minutes (step S51).
[0020]
If it is determined in step S51 that the print data has not been received for the predetermined n minutes (step S51; No), the power supply to the paper feed motor is continued (the supply of the hold current is continued). ), And enters a standby state.
[0021]
If it is determined in step S51 that the print data has not been received for a predetermined n minutes or more, the current excitation phase of the paper feed motor is stored (step S52). In the case of the above example, the excitation phase is stored so that the coil A has the N pole, the coil B has the N pole, the coil C has the S pole, and the coil D has the S pole.
[0022]
Next, the supply of the hold current of the paper feed motor is cut (step S53).
As a result, the rotor is rotated counterclockwise again by the back tension, and the N pole of the permanent magnet forming the rotor attracts the iron core (coil A in FIG. 14) of the coil forming the stator, and the S pole changes. A stable state is established by attracting the iron core (coil C in FIG. 14) of the coil constituting the stator.
[0023]
Subsequently, the MPU (not shown) determines whether print data has been received (step S54).
[0024]
If it is determined in step S54 that the print data has not been received (step S54; No), the process proceeds to step S54 again, and the process is kept in a standby state.
[0025]
If the print data is received again in the determination of step S54 (step S54; Yes), the paper feed motor is energized with the excitation phase stored in step S52 (step S55).
[0026]
Specifically, in the case of the above example, the current is supplied such that the coil A has the N pole, the coil B has the N pole, the coil C has the S pole, and the coil D has the S pole.
[0027]
As a result, as shown in FIG. 15, the rotor further rotates in the counterclockwise direction, and the S pole of the permanent magnet forming the rotor is stabilized in the middle between the coils A and B forming the N pole. The N pole of the permanent magnet is stabilized between the coils C and D constituting the S pole.
[0028]
Therefore, as compared with the state shown in FIG. 13, the medium is rewound by one rotation, and the position shift by one rotation of the paper feed motor occurs.
[0029]
The above-described invention is directed to a case where a displacement occurs due to the influence of the back tension due to the medium. However, when a configuration in which the driving force of the motor is transmitted by a transmission mechanism including gears, a gear is used. In addition, the influence of backlash (backlash) is further added, and a further displacement occurs.
[0030]
Therefore, an object of the present invention is to provide a motor drive mechanism control device capable of driving a motor drive mechanism without causing a position shift at the time of re-driving, even when cutting a hold current to the motor for energy saving. A control method, a recording apparatus, and a method for controlling the recording apparatus are provided.
[0031]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a drive mechanism control device for controlling a motor drive mechanism that is driven by a stepping motor to which a holding current for holding a position of a rotor is supplied during standby is provided by stopping the supply of the holding current. A first drive control unit that rotates the rotor by a predetermined amount in a first direction that is a direction in which the rotor receives less power from a driving load when the supply of the holding current is stopped; An excitation phase storage unit that stores an excitation phase after the rotation of the rotor in the direction, and when the stepping motor is driven again, the stepping motor is energized with the stored excitation phase, and the direction is opposite to the first direction. And a second drive control unit for rotating the rotor by the predetermined amount in the second direction.
[0032]
According to the above configuration, the first drive control unit sets the predetermined amount in the first direction which is a direction in which the rotor receives less power from the driving load when the supply of the holding current is stopped before the supply of the holding current is stopped. By rotating the rotor only, the inadvertent rotation of the rotor during the holding current supply suspension period is suppressed. Then, the excitation phase storage unit stores the excitation phase after the rotation of the rotor in the first direction.
[0033]
The second drive control unit energizes the stepping motor with the stored excitation phase when the stepping motor is redriven, rotates the rotor by a predetermined amount in the second direction, and reduces the force received by the driving load on the position of the rotor. Return to the previous position.
[0034]
Further, a drive mechanism control device for controlling a motor drive mechanism that is driven by a stepping motor to which a holding current for holding the position of the rotor is supplied during standby is a supply stop control for stopping the supply of the holding current. A first drive control unit that rotates the rotor by a predetermined amount in a first direction that is a direction in which the rotor receives a drive load when the supply of the holding current is stopped, and a first drive control unit that rotates the rotor in the first direction. An excitation phase storage unit that stores an excitation phase after rotation of the rotor; and when the stepping motor is re-driven, power is supplied to the stepping motor with the stored excitation phase, and the excitation current is stored in a second direction opposite to the first direction. A second drive control unit for rotating the rotor by the predetermined amount.
[0035]
According to the above configuration, the first drive control unit rotates the rotor by a predetermined amount in the first direction that is a direction in which the rotor receives less power from the drive load when the supply of the holding current is stopped, and during the holding current supply stop period. Inadvertent rotation of the rotor is suppressed. Then, the excitation phase storage unit stores the excitation phase after the rotation of the rotor in the first direction.
[0036]
Thereafter, the supply stop control unit stops the supply of the holding current.
[0037]
On the other hand, when the stepping motor is re-driven, the second drive control section energizes the stepping motor with the stored excitation phase, rotates the rotor by a predetermined amount in the second direction, and applies a force received by the driving load to the position of the rotor. To the position immediately before the relaxation.
[0038]
A drive mechanism for controlling a motor drive mechanism having a driving force transmission mechanism for transmitting a driving force of the stepping motor, the driving source being a stepping motor to which a holding current for holding the position of the rotor is supplied during standby Prior to the stop of the supply of the holding current, the control device controls the rotor by a first predetermined amount in a first direction which is a direction in which the rotor maintains a force received from a driving load when the supply of the hold current is stopped. A first drive control unit for rotating the rotor, a second drive control unit for rotating the rotor by the first predetermined amount in a second direction opposite to the first direction, and a rotation of the rotor in the second direction. An excitation phase storage unit that stores an excitation phase after rotation, and a re-energization control unit that re-energizes the stepping motor with the stored excitation phase when the stepping motor is re-driven. It is characterized in that.
[0039]
According to the above configuration, the first drive control unit performs the first direction in which the rotor receives the drive load from the driving load when the supply of the holding current is stopped before the supply of the holding current is stopped. The second drive control unit rotates the rotor by a first predetermined amount in a second direction opposite to the first direction, and rotates the rotor by a predetermined amount during the suspension of the holding current supply. Suppress rotation. Then, the excitation phase storage unit stores the excitation phase after the rotation of the rotor in the first direction.
[0040]
Then, the re-energization control unit re-energizes the stepping motor with the stored excitation phase when the stepping motor is re-driven.
[0041]
A drive mechanism for controlling a motor drive mechanism having a driving force transmission mechanism for transmitting a driving force of the stepping motor, the driving source being a stepping motor to which a holding current for holding the position of the rotor is supplied during standby The control device includes a supply stop control unit that stops supply of the holding current, and, prior to the stop of supply of the holding current, maintains a force that the rotor receives from a driving load when the supply of the holding current is stopped. A first drive control unit that rotates the rotor by a first predetermined amount in a first direction that is a direction, and a second drive control unit that rotates the rotor by the first predetermined amount in a second direction opposite to the first direction. A drive control unit; an excitation phase storage unit for storing an excitation phase after the rotation of the rotor in the second direction; and a stepping operation using the stored excitation phase when the stepping motor is driven again. Is characterized by comprising a re-energization control unit for re-energizing the Ngumota, the.
[0042]
According to the above configuration, before the supply of the holding current is stopped, the first drive control unit performs the first direction in the first direction, which is a direction in which the rotor receives the force received from the driving load when the supply of the holding current is stopped. The rotor is rotated by a predetermined amount, and the second drive control unit rotates the rotor by a first predetermined amount in a second direction opposite to the first direction, and inadvertent rotation of the rotor during the holding current supply suspension period Suppress. Then, the excitation phase storage unit stores the excitation phase after the rotation of the rotor in the first direction.
[0043]
Thereafter, the supply stop control unit stops the supply of the holding current.
Then, the re-energization control unit re-energizes the stepping motor with the stored excitation phase when the stepping motor is re-driven.
[0044]
In this case, a backlash setting control unit that rotates the rotor in a third direction to set a substantial backlash in the driving force transmission mechanism; and a backlash in a fourth direction opposite to the third direction. A backlash removal control unit configured to rotate the rotor by an amount rotated by the lash setting control unit and remove a predetermined backlash may be provided.
[0045]
Further, the supply stop control unit may stop the supply of the holding current when a predetermined time has elapsed after the stepping motor has entered a standby state.
[0046]
In addition, a driving mechanism control method for controlling a motor driving mechanism that is driven by a stepping motor to which a holding current for holding the position of the rotor is supplied during standby is provided before the holding current is stopped. A first drive control step of rotating the rotor by a predetermined amount in a first direction in order to reduce a force applied to the rotor by a drive load when a current supply is stopped; and rotating the rotor in the first direction. An exciting phase storing step of storing a subsequent exciting phase; and when the stepping motor is driven again, the stepping motor is re-energized with the stored exciting phase, and the stepping motor is moved in a second direction opposite to the first direction. A second drive control step of rotating the rotor by a fixed amount.
[0047]
Further, a drive mechanism control method for controlling a motor drive mechanism using a stepping motor as a drive source to which a holding current for holding the position of the rotor is supplied during standby is provided when the supply of the holding current is stopped. A first drive control step of rotating the rotor by a predetermined amount in a first direction, which is a direction in which the rotor receives less force from a drive load, and an excitation phase after the rotation of the rotor in the first direction is stored. An exciting phase storing step, a holding current supply stopping step of stopping the supply of the holding current after storing the exciting phase, and when the stepping motor is redriven, the stepping motor is re-energized with the stored exciting phase, A second drive control step of rotating the rotor by the predetermined amount in a second direction opposite to the first direction.
[0048]
A drive mechanism for controlling a motor drive mechanism having a driving force transmission mechanism for transmitting a driving force of the stepping motor, the driving source being a stepping motor to which a holding current for holding the position of the rotor is supplied during standby The control method includes, prior to stopping the supply of the holding current, controlling the rotor by a first predetermined amount in a first direction which is a direction in which the rotor maintains a force received from a driving load when the supply of the holding current is stopped. A first drive control step of rotating the rotor, and a second drive control step of rotating the rotor by the first predetermined amount in a second direction opposite to the first direction after the rotation of the rotor in the first drive control step An excitation phase storing step of storing an excitation phase after the rotation of the rotor in the second direction; and, when the stepping motor is driven again, the stored excitation phase It is characterized by comprising a re-energizing process for re-energizing the stepping motor.
[0049]
A drive mechanism for controlling a motor drive mechanism having a driving force transmission mechanism for transmitting a driving force of the stepping motor, the driving source being a stepping motor to which a holding current for holding the position of the rotor is supplied during standby A control method comprising: a first drive control step of rotating the rotor by a first predetermined amount in a first direction that is a direction for maintaining the force received by the drive load when the supply of the holding current is stopped; A second drive control step of rotating the rotor by the first predetermined amount in a second direction opposite to the first direction after the rotation of the rotor in the first drive control step; An exciting phase storing step of storing the exciting phase after the rotation of the rotor, a holding current supply stopping step of stopping the supply of the holding current after storing the exciting phase, and a stepping mode. Re drive during the is characterized by the stored the excitation phase that and a re-energizing process for re-energizing the stepping motor.
[0050]
In this case, after the re-energization, a backlash setting control step of rotating the rotor by a second predetermined amount in a third direction that is a direction in which substantial backlash in the driving force transmission mechanism is set; In the setting control process, after rotating the rotor by the second predetermined amount in the third direction, the rotor is rotated by the second predetermined amount in a fourth direction opposite to the third direction, and A backlash removing control step of removing backlash.
[0051]
Further, in the holding current supply stopping step, the supply of the holding current may be stopped when a predetermined time has elapsed since the stepping motor reached a standby state.
[0052]
Further, the apparatus includes a transport mechanism for transporting the medium by using a stepping motor, which is supplied with a holding current for holding the position of the rotor during standby, as a driving source, and performs printing of an image including characters based on input print data. The apparatus includes a supply stop control unit that stops the supply of the holding current, and a predetermined amount in a first direction that reduces a force received by the rotor due to the conveyance of the medium when the supply of the holding current is stopped. A first drive control unit that rotates the rotor only, an excitation phase storage unit that stores an excitation phase after the rotation of the rotor in the first direction, and an excitation phase that is stored when the stepping motor is driven again. A second drive control unit that re-energizes the stepping motor and rotates the rotor by the predetermined amount in a second direction opposite to the first direction.
[0053]
According to the above configuration, the first drive control unit is configured to reduce the force received by the rotor due to the conveyance of the medium when the supply of the holding current is stopped before the supply of the holding current is stopped. By rotating the rotor by a predetermined amount in the direction, the inadvertent rotation of the rotor during the holding current supply suspension period is suppressed. Then, the excitation phase storage unit stores the excitation phase after the rotation of the rotor in the first direction.
[0054]
Thereafter, the supply stop control unit stops the supply of the holding current.
When the stepping motor is driven again, the second drive control unit supplies power to the stepping motor with the stored excitation phase, rotates the rotor by a predetermined amount in the second direction, and receives the position of the rotor due to the transport of the medium. Return to the position just before relieving the force.
[0055]
Further, the apparatus includes a transport mechanism for transporting the medium by using a stepping motor, which is supplied with a holding current for holding the position of the rotor during standby, as a driving source, and performs printing of an image including characters based on input print data. The apparatus further includes a supply stop control unit that stops the supply of the holding current, and a first direction that is a direction that maintains the force received by the rotor due to the conveyance of the medium when the supply of the holding current is stopped. A first drive control unit that rotates the rotor by a first predetermined amount, a second drive control unit that rotates the rotor by a first predetermined amount in a second direction opposite to the first direction, An excitation phase storage unit for storing an excitation phase after the rotation of the rotor in the second direction; and a re-energization control for re-energizing the stepping motor with the stored excitation phase when the stepping motor is re-driven. It is characterized by having a and.
[0056]
According to the above configuration, the first drive control unit performs the first direction in which the rotor receives the drive load from the driving load when the supply of the holding current is stopped before the supply of the holding current is stopped. The second drive control unit rotates the rotor by a first predetermined amount in a second direction opposite to the first direction, and rotates the rotor by a predetermined amount during the suspension of the holding current supply. Suppress rotation. Then, the excitation phase storage unit stores the excitation phase after the rotation of the rotor in the first direction.
[0057]
Thereafter, the supply stop control unit stops the supply of the holding current.
[0058]
Then, the re-energization control unit re-energizes the stepping motor with the stored excitation phase when the stepping motor is re-driven.
[0059]
In this case, after the re-energization, a backlash setting control unit that rotates the rotor by a second predetermined amount in a third direction that is a direction in which substantial backlash in the driving force transmission mechanism is set; A backlash removal control unit configured to rotate the rotor by the second predetermined amount in a fourth direction opposite to the direction to remove a predetermined backlash.
Further, the supply stop control unit may stop the supply of the holding current when a predetermined time has elapsed since the input of the recording data was stopped.
[0060]
Further, the apparatus includes a transport mechanism for transporting the medium by using a stepping motor, which is supplied with a holding current for holding the position of the rotor during standby, as a driving source, and performs printing of an image including characters based on input print data. A control method of the apparatus includes: rotating the rotor by a predetermined amount in a first direction that is a direction in which the rotor receives a force caused by the conveyance of the medium when the supply of the holding current is stopped. A drive control step, an excitation phase storing step of storing an excitation phase after the rotation of the rotor in the first direction, a holding current supply stopping step of stopping the supply of the holding current after storing the excitation phase, When the stepping motor is driven again, the stepping motor is re-energized in the stored excitation phase, and the rotor is rotated by the predetermined amount in a second direction opposite to the first direction. It is characterized by comprising a second drive control process, the to.
[0061]
Further, the apparatus includes a transport mechanism for transporting the medium by using a stepping motor, which is supplied with a holding current for holding the position of the rotor during standby, as a driving source, and performs printing of an image including characters based on input print data. The method of controlling the apparatus includes: rotating the rotor by a predetermined amount in a first direction that is a direction for maintaining a force received by the rotor due to the conveyance of the medium when the supply of the holding current is stopped; A drive control step, a second drive control step of rotating the rotor by the predetermined amount in a second direction opposite to the first direction after the rotation of the stepping motor in the first drive control step, and the second direction An excitation phase storing step of storing an excitation phase after the rotation of the rotor to the motor; a holding current supply stopping step of stopping the supply of the holding current after storing the excitation phase; Re driving time of Gumota is characterized by the stored the excitation phase that and a re-energizing process for re-energizing the stepping motor.
[0062]
In this case, after the re-energization, a backlash setting control step of rotating the rotor by a second predetermined amount in a third direction to set a substantial backlash in the driving force transmission mechanism; In the process, after rotating the rotor in the third direction, the rotor is rotated by the second predetermined amount in the third direction in a fourth direction opposite to the third direction to reduce a predetermined backlash. And a backlash elimination control process for elimination.
[0063]
Further, in the holding current supply stopping step, the supply of the holding current may be stopped when a predetermined time has elapsed since the input of the recording data was stopped.
[0064]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a preferred embodiment of the present invention will be described with reference to the drawings.
[1] First Embodiment
FIG. 1 is an external perspective view illustrating a dot impact printer according to an embodiment.
[0065]
The dot impact printer 10 prints an image including characters by hitting a large number of recording wires on a sheet via an ink ribbon (both not shown) and recording dots.
[0066]
The dot impact printer 10 includes a printer main body 11 as a recording apparatus main body, a sheet supply guide 43 that is installed in front of the printer main body 11 and is configured to allow a cut sheet K to be manually inserted, and a rear side of the printer main body 11. And a sheet feeder CSF for automatically feeding the cut sheet K to the recording unit.
[0067]
FIG. 2 is an external perspective view of the printer main body 11 with the paper feeding device CSF removed.
[0068]
A push tractor unit (continuous sheet conveying device) 12 that supplies a continuous sheet to the recording unit is disposed substantially directly below the sheet feeding device CSF.
[0069]
Here, examples of the cut sheet K include cut films such as cut sheet paper, copy paper, and OHP (overhead projector) sheets. In addition, continuous sheets include continuous paper and continuous copy paper.
[0070]
FIG. 3 is an external perspective view of a sheet conveying mechanism of the printer main body 11.
[0071]
As shown in FIG. 3, the sheet transport mechanism 30 includes a paper feed roller 13 connected to the push tractor unit 12, a platen 20, and a transport roller unit 21. Also,
FIG. 4 is an external perspective view showing the carriage.
[0072]
Above the platen 20, a carriage 31 is provided as shown in FIG. On the carriage 31, a ribbon cartridge 35 and a print head 36 are mounted. The carriage 31 is supported by a carriage guide shaft 32 and is moved by scanning above the platen 20 in the axial direction of the platen 20.
[0073]
The carriage guide shaft 32 is rotatably supported between the side frames 33 and 34.
[0074]
A paper detector 45 for detecting the presence or absence of a sheet as a medium is provided on the lower surface side of the transport path.
[0075]
FIG. 5 is an explanatory diagram of a driving force transmission mechanism of a paper feed motor which is a stepping motor.
[0076]
The shaft 50A of the paper feed motor 50 is provided with a gear 50B.
[0077]
A transmission gear 13B provided at one end of the roller shaft 13A is arranged above the gear 50B, and meshes with the gear 50B. A paper feed roller 13 is provided on the roller shaft 13A, and a transmission gear 13C is disposed at the other end.
[0078]
The driving force of the paper feed motor 50 is transmitted to the platen shaft 20A and the roller shaft 21A via the transmission gear 13B and the reduction gear train 50, so that the platen 20 and the transport roller unit 21 are driven.
[0079]
On the other hand, the driving force of the paper feed motor 50 is transmitted to the tractor drive shaft 12A via the transmission gear 13C and the reduction gear train 51, so that the tractors 12B and 12C constituting the push tractor unit 12 are driven. Become. When the push tractor unit 12 is not used, the driving force of the paper feed motor 50 is prevented from being transmitted to the reduction gear train 51 via the transmission gear 13C by a switching mechanism (not shown).
[0080]
First, prior to a detailed description, an operation outline of the first embodiment will be described.
[0081]
In the first embodiment, the presence or absence of a sheet as a medium, the forms override area, or the selected medium transport path (determined by the selected medium type, for example, the type of medium such as cut-sheet paper and continuous paper) ), The control of the paper feed motor 50 is changed.
[0082]
More specifically, when the medium is not set and is not in the forms override area, the hold current of the paper feed motor 50 is cut when the state in which print data is not received continues for n minutes or more. I do. Thereafter, when print data is received, the paper feed motor 50 is energized in an arbitrary excitation phase.
[0083]
Also, if the medium is set, or if the medium is not set and the area is the forms override area, the state in which print data is not received continues for n minutes or more, the medium transport path is determined, The back tension relaxation amount (r1) suitable for the determined medium transport path is set, and the paper feed motor 50 is rotated in the direction opposite to the medium transport direction to reduce the back tension, and the excitation phase at the current time is stored. Then, the hold current of the paper feed motor 50 is cut.
[0084]
Thereafter, when print data is received again, the motor is energized in the stored excitation phase, and then the paper feed motor 50 is rotated in the medium transport direction by an amount corresponding to the back tension relaxation amount, and the printing operation is performed based on the position. I do.
[0085]
FIG. 6 shows a processing flowchart of the first embodiment.
[0086]
First, an MPU (not shown) of the dot impact printer 10 determines whether or not print data has not been received for a predetermined n minutes (step S1).
[0087]
If it is determined in step S1 that the print data has not been received for a predetermined n minutes (step S1; No), the power supply to the paper feed motor 50 is continued (the supply of the hold current is continued). ), And enters a standby state.
[0088]
If it is determined in step S1 that the print data has not been received for a predetermined n minutes or more (step S1; Yes), the paper detector 45 determines whether there is a sheet (step S2).
[0089]
If it is determined in step S2 that a sheet is set (step S2; Yes), the MPU determines the transport path of the set sheet (step S3). Specifically, in the dot impact printer 10 of the present embodiment, since the sheet conveyance path is switched at the position of the release lever, the MPU determines the position of the release lever based on the output of the release lever position detector that detects the position of the release lever. To determine the sheet conveyance path.
[0090]
If it is determined in step S3 that the transport path is on the continuous paper side (step S3; continuous paper), a pulse for continuous paper is set as the number of motor drive pulses of the paper feed motor 50 for the back tension relaxation amount r1. The number r1tr is set (step S4). That is,
r1 = r1tr
To step S6.
[0091]
If it is determined in step S3 that the transport path is on the cut-sheet paper side (step S3; cut-sheet paper), the cut-sheet paper is set as the number of motor drive pulses of the driving amount of the paper feed motor 50 corresponding to the back tension relaxation amount r1. Pulse number r1fr is set. That is,
r1 = r1fr
(Step S5).
[0092]
Next, the MPU controls the paper feed motor 50, and rotates the paper feed motor 50 by the number of pulses corresponding to r1 in a direction opposite to the rotation direction (drive direction) of the immediately preceding paper feed motor 50 (step S6). That is, when the sheet is continuous paper, the paper feed motor 50 is rotated by the pulse number r1tr for continuous paper, and when the sheet is cut sheet, the paper feed motor is fed by the pulse number r1fr for cut sheet. The motor 50 is rotated.
[0093]
As a result, the back tension, which is the force that the rotor of the paper feed motor 50 receives as the sheet as the medium is transported, is reduced.
[0094]
Next, the MPU stores the current excitation phase in the paper feed motor 50 (step S7).
[0095]
Next, the supply of the hold current of the paper feed motor 50 is cut (step S8).
[0096]
As a result, the rotor of the paper feed motor 50 is positioned at the iron core position of the stator coil closest to the state at the time of the energization cut, that is, as shown in FIG. It is attracted to the iron core (coil A and coil C in FIG. 7) to be in a stable state.
[0097]
Subsequently, the MPU (not shown) determines whether print data has been received (step S9).
[0098]
If it is determined in step S9 that the print data has not been received (step S9; No), the process proceeds to step S9 again, and the processing is kept in a standby state.
[0099]
If the print data is received again in the determination of step S9 (step S9; Yes), the paper feed motor 50 is energized with the excitation phase stored in step S7 (step S10).
[0100]
As a result, the rotor is in the same position as in the state immediately before the energization cut, for example, as shown in FIG. 8, the S pole of the permanent magnet forming the rotor is stable in the middle between the coils A and B forming the N pole. As a result, the N pole of the permanent magnet is stabilized between the coils C and D constituting the S pole.
[0101]
Next, the MPU controls the paper feed motor 50, and a pulse corresponding to r1 in the same direction as the sheet conveyance direction at the time of the previous printing, which is the opposite direction to the rotation direction (drive direction) of the paper feed motor 50 in step S6. The paper feed motor 50 is rotated by the number (step S11). That is, when the sheet is continuous paper, the paper feed motor 50 is rotated by the pulse number r1tr for continuous paper, and when the sheet is cut sheet, the paper feed motor 50 is rotated by the pulse number r1fr for cut sheet. The motor 50 is rotated.
[0102]
As a result, the state can be returned to the state substantially the same as the state in step S1, and energy can be saved without being affected by the back tension.
[0103]
On the other hand, if it is determined in step S2 that the sheet is not set (step S2; No), the MPU determines whether the sheet is in the forms override area (step S12).
[0104]
If it is determined in step S12 that the area is the forms override area (step S12; Yes), the process proceeds to step S3, and the same process is performed.
[0105]
If it is determined in step S12 that the area is not the forms override area (step S12; No), the hold current of the paper feed motor 50 is cut (step S13).
[0106]
Subsequently, the MPU (not shown) determines whether print data has been received (step S14).
[0107]
If it is determined in step S14 that the print data has not been received (step S14; No), the process returns to step S14, and the process is kept in a standby state.
[0108]
If it is determined in step S14 that the print data is received again (step S14; Yes), the paper feed motor 50 is energized with an arbitrary excitation phase (step S15), and the subsequent printing operation is started.
[0109]
As described above, according to the first embodiment, when the paper feed motor 50, which is a stepping motor, is subjected to open-loop control, the paper feed motor is used to save energy in a standby state where print data is not sent. In cutting the hold current to 50, the paper feed motor 50 is rotated in the direction opposite to the immediately preceding paper feed direction to reduce the back tension and then cut the hold current. Accordingly, it is possible to prevent the rotor of the paper feed motor 50 from rotating in an uncontrollable state due to the influence of the back tension, and to make the rotor position before cut of the hold current coincide with the rotor position after re-energization. Thus, it is possible to achieve both the prevention of the displacement of the printing position and the energy saving by cutting the hold current.
[0110]
In the above description, a more specific description has been given. However, in principle, a motor drive mechanism using a stepping motor as a drive source supplied with a holding current for holding the position of the rotor during standby is controlled. At this time, when the supply of the holding current is stopped, the rotor is rotated by a predetermined amount in the first direction to reduce the force applied to the rotor by the driving load, and the excitation phase after the force is reduced is stored. The supply of the holding current is stopped.
[0111]
Then, the stepping motor is re-energized in the excitation phase stored when the stepping motor is re-driven, and the rotor is rotated by an amount rotated in the second direction opposite to the first direction to return the rotor position. do it.
More specifically, when the supply of the holding current is stopped, the rotor is rotated by a predetermined amount in a first direction, which is a direction in which the force received by the rotor from the drive load is reduced, and the excitation phase after the force is reduced is stored. After the excitation phase is stored, the supply of the holding current is stopped.
[0112]
Then, the stepping motor is re-energized with the excitation phase stored when the stepping motor is re-driven, and the rotor is rotated by a predetermined amount in the second direction opposite to the first direction to return the rotor position. is there.
[2] Second embodiment
In the first embodiment, only the back tension is considered as the cause of the print position shift due to the hold current cut. However, in an actual motor drive mechanism, other causes of the print position shift include gears and the like. There is a backlash in the driving force transmission mechanism.
[0113]
That is, the second embodiment is an embodiment in which the back tension and the backlash are considered.
[0114]
First, prior to the detailed description, an outline of the operation of the second embodiment will be described.
[0115]
In the first embodiment, the presence or absence of a sheet as a medium, the forms override area, or the selected medium transport path (determined by the selected medium type, for example, the type of medium such as cut-sheet paper and continuous paper) ), The control of the paper feed motor 50 is changed.
[0116]
More specifically, when the medium is not set and is not in the forms override area, the hold current of the paper feed motor 50 is cut when the state in which print data is not received continues for n minutes or more. I do. Thereafter, when print data is received, the paper feed motor 50 is energized in an arbitrary excitation phase.
[0117]
Also, if the medium is set, or if the medium is not set and the area is the forms override area, the state in which print data is not received continues for n minutes or more, the medium transport path is determined, The back tension relaxation amount (r1) suitable for the determined medium transport path is set, and the paper feed motor 50 is rotated in the direction opposite to the medium transport direction to reduce the back tension, and the excitation phase at the current time is stored. Then, the hold current of the paper feed motor 50 is cut.
[0118]
Thereafter, when print data is received again, the motor is energized in the stored excitation phase, and then the paper feed motor 50 is rotated in the medium transport direction by an amount corresponding to the back tension relaxation amount, and the printing operation is performed based on the position. I do.
[0119]
FIG. 9 shows a processing flowchart of the second embodiment.
[0120]
First, the MPU (not shown) of the dot impact printer 10 determines whether or not print data has not been received for a predetermined n minutes (step S21).
[0121]
If it is determined in step S21 that the print data has not been received for a predetermined n minutes (step S21; No), the power supply to the paper feed motor 50 is continued (the supply of the hold current is continued). ), And enters a standby state.
[0122]
If it is determined in step S21 that the print data has not been received for a predetermined n minutes or more (step S21; Yes), the paper detector 45 determines whether there is a sheet (step S22).
[0123]
If it is determined in step S22 that a sheet is set (step S22; Yes), the MPU determines the transport path of the set sheet (step S23). Specifically, in the dot impact printer 10 of the present embodiment, since the sheet conveyance path is switched at the position of the release lever, the MPU determines the position of the release lever based on the output of the release lever position detector that detects the position of the release lever. To determine the sheet conveyance path.
[0124]
If it is determined in step S23 that the transport path is on the continuous paper side (step S23; continuous paper), the pulse for continuous paper is set as the number of motor drive pulses of the paper feed motor 50 for the back tension relaxation amount r1. The number r1tr is set (step S24). That is,
r1 = r1tr
Then, the process proceeds to step S26.
[0125]
If it is determined in step S23 that the transport path is on the cut sheet side (step S23; cut sheet), the cut sheet is set as the number of motor drive pulses of the driving amount of the paper feed motor 50 corresponding to the back tension relaxation amount r1. Pulse number r1fr is set. That is,
r1 = r1fr
(Step S25).
[0126]
Next, the MPU controls the paper feed motor 50 to rotate the paper feed motor 50 by the number of pulses corresponding to the rotation direction (drive direction) r1 of the immediately preceding paper feed motor 50 (step S26). That is, when the sheet is continuous paper, the paper feed motor 50 is rotated by the pulse number r1tr for continuous paper, and when the sheet is cut sheet, the paper feed motor is fed by the pulse number r1fr for cut sheet. The motor 50 is rotated.
[0127]
Further, the MPU controls the paper feed motor 50 and rotates the paper feed motor 50 by the number of pulses corresponding to r1 in a direction opposite to the rotation direction (drive direction) of the paper feed motor 50 in step S26 (step S27). That is, when the sheet is continuous paper, the paper feed motor 50 is rotated by the pulse number r1tr for continuous paper, and when the sheet is cut sheet, the paper feed motor is fed by the pulse number r1fr for cut sheet. The motor 50 is rotated.
[0128]
As a result, in a state where the back tension is reduced, the rotor is in a state where the hold current is supplied.
[0129]
Next, the MPU stores the current excitation phase in the paper feed motor 50 (Step S28).
[0130]
Next, the supply of the hold current of the paper feed motor 50 is cut (step S29).
[0131]
As a result, the rotor of the paper feed motor 50 is in a stable state in which the permanent magnet constituting the rotor attracts the iron core at the iron core position of the stator coil closest to the state at the time of the energization cut.
[0132]
Subsequently, the MPU (not shown) determines whether print data has been received (step S30).
[0133]
If it is determined in step S30 that the print data has not been received (step S30; No), the process proceeds to step S30 again, and the processing is kept in a standby state.
[0134]
If it is determined in step S30 that the print data is received again (step S30; Yes), the paper feed motor 50 is energized with the excitation phase stored in step S28 (step S31).
[0135]
Next, the MPU controls the paper feed motor 50 so that the drive transmission system is controlled to cancel the influence of a predetermined backlash of the drive transmission system with respect to the immediately preceding rotation direction (drive direction) of the paper feed motor 50. The paper feed motor 50 is rotated by a pulse number r2 sufficient to absorb the data (step S32). That is, the paper feed motor 50 is rotated by the pulse number r2 in the direction opposite to the sheet conveying direction.
[0136]
Further, the MPU controls the paper feed motor 50 to rotate the paper feed motor 50 by the number of pulses corresponding to r2 in a direction opposite to the rotation direction (drive direction) of the paper feed motor 50 in step S32 (step S33). That is, by rotating the paper feed motor 50 by the pulse number r2 in the sheet conveying direction, the influence of the backlash can be cancelled, and the state can be returned to substantially the same state as in step S21. Energy saving without being affected by the backlash.
[0137]
On the other hand, if it is determined in step S22 that a sheet is not set (step S22; No), the MPU determines whether or not the sheet is in the forms override area (step S34).
[0138]
If it is determined in step S34 that the area is the forms override area (step S34; Yes), the process proceeds to step S23, and the same processing is performed thereafter.
[0139]
If it is determined in step S34 that the current area is not the forms override area (step S34; No), the hold current of the paper feed motor 50 is cut (step S35).
[0140]
Subsequently, the MPU (not shown) determines whether print data has been received (step S36).
[0141]
If it is determined in step S36 that the print data has not been received (step S36; No), the process proceeds to step S36 again, and the processing is kept in a standby state.
[0142]
If it is determined in step S36 that the print data is received again (step S36; Yes), the paper feed motor 50 is energized with an optional excitation phase (step S37), and the subsequent printing operation is started.
[0143]
As described above, according to the second embodiment, when the paper feed motor 50, which is a stepping motor, is subjected to open loop control, the paper feed motor is used to save energy in a standby state where print data is not sent. When cutting the hold current to 50, the paper feed motor 50 is rotated in the opposite direction to the immediately preceding paper feed direction to reduce the back tension, cut the hold current, and after re-energizing, By rotating the paper feed motor 50 in the direction opposite to the paper feed and again in the reverse direction, the effect of backlash in the drive transmission system is canceled.
[0144]
Therefore, it is possible to prevent the rotor of the paper feed motor 50 from rotating in an uncontrollable state due to the influence of the back tension, and to cancel the influence of the backlash of the drive transmission system at the time of restart.
[0145]
That is, the rotor position before the cut of the hold current can be matched with the rotor position after the re-energization, and both the prevention of the printing position shift and the energy saving by the cut of the hold current can be achieved.
[0146]
In the above description, a more specific example has been described, but in principle, a transport mechanism that transports the medium by using a stepping motor, which is supplied with a holding current for holding the position of the rotor during standby, as a drive source, is provided. In a printing apparatus that prints an image including characters based on input print data, a first direction is a direction in which a rotor receives a force caused by transport of a medium when a supply of a holding current is stopped. After rotating the rotor by a first predetermined amount in the direction and further rotating the rotor by a first predetermined amount in the second direction opposite to the first direction to reduce the force, the supply of the holding current is stopped. Then, the excitation phase after force relaxation is stored. Then, the stepping motor may be energized again with the excitation phase stored when the stepping motor is redriven.
[3] Modification of Embodiment
In the above-described second embodiment, after re-energization, the rotor is rotated by a predetermined amount (second predetermined amount) in the third direction, which is a direction in which substantial backlash in the drive transmission system is set, and Has adopted a configuration in which the rotor is rotated by a predetermined amount (a second predetermined amount) in the reverse fourth direction to remove a predetermined backlash. The rotor is rotated in the third direction in order to set a typical backlash, and the rotor is rotated in the fourth direction opposite to the third direction by the amount rotated by the backlash setting control unit, and a predetermined backlash is generated. What is necessary is just to remove it.
[0147]
In the above-described second embodiment, both the effect of the back tension and the effect of the backlash are dealt with. However, in the same manner as in the second embodiment, only the effect of the back tension is reduced. Is also possible.
[0148]
That is, the rotor is rotated in a first direction which is a direction for maintaining the rotor force caused by the transport of the medium, and is rotated in a first direction in a second direction opposite to the first direction after the rotation of the stepping motor. The rotor is rotated by an amount to relax the force, the excitation phase after the force is relaxed is stored, and after the excitation phase is stored, the supply of the holding current is stopped. Then, when the stepping motor is driven again, the stepping motor may be re-energized with the stored excitation phase.
[0149]
More specifically, the rotor is rotated by a first predetermined amount in a first direction, which is a direction in which the force of the rotor resulting from the transport of the medium is maintained, and a second direction opposite to the first direction is rotated after the stepping motor rotates. The rotor is rotated in the direction by a first predetermined amount to reduce the force, the excitation phase after the force is relaxed is stored, and after the excitation phase is stored, the supply of the holding current is stopped. Then, when the stepping motor is driven again, the stepping motor may be re-energized with the stored excitation phase.
[0150]
In the above description, the case of a dot impact printer has been described as an example, but the present invention is applicable to any recording apparatus having a medium transport mechanism such as an ink jet printer or a laser printer.
[0151]
Further, the present invention is not limited to a recording device such as a printer, and can be applied to a control device of a drive mechanism that needs to consider the influence of back tension or backlash on a stepping motor.
[0152]
【The invention's effect】
According to the present invention, in the motor drive mechanism, even when the hold current to the motor is cut for energy saving, the motor can be driven without causing a position shift at the time of re-drive due to the influence of back tension or backlash.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a printer main body of a dot impact printer to which an embodiment of a recording apparatus according to the present invention is applied.
FIG. 2 is an external perspective view of the printer main body from which a sheet feeding device is removed.
FIG. 3 is an external perspective view of a sheet transport mechanism of the printer body.
FIG. 4 is an external perspective view showing a carriage.
FIG. 5 is an explanatory diagram of a driving force transmission mechanism of a paper feed motor that is a stepping motor.
FIG. 6 is a processing flowchart of the first embodiment.
FIG. 7 is a diagram illustrating the relationship between the rotor and the stator of the paper feed motor when a medium is set (there is a medium and there is no back tension) and when power is not supplied.
FIG. 8 is a diagram illustrating the relationship between the rotor and the stator of the paper feed motor when a medium is set (there is a medium and there is no back tension) and power is supplied.
FIG. 9 is a processing flowchart of the second embodiment.
FIG. 10 is a diagram illustrating the relationship between the rotor and the stator of the paper feed motor when a medium is not set (no medium, no back tension) and when power is supplied.
FIG. 11 is a diagram illustrating the relationship between the rotor and the stator of the paper feed motor when the medium is not set (no medium, no back tension) and when power is not supplied.
FIG. 12 is a processing flowchart of control processing of a paper feed motor driving mechanism of a conventional printer.
FIG. 13 is a diagram illustrating the relationship between the rotor and the stator of the paper feed motor when a medium is set (there is a medium and there is a back tension) and power is supplied.
FIG. 14 is a diagram illustrating the relationship between the rotor and the stator of the paper feed motor when a medium is set (there is a medium and there is a back tension) and no current is supplied.
FIG. 15 is a diagram illustrating the relationship between the rotor and the stator of the paper feed motor when a medium is set (there is a medium and there is a back tension) and when the power is supplied again.
[Explanation of symbols]
10 Printer (recording device)
11 Printer body (supply stop control unit, first drive control unit, excitation phase storage unit, re-energization control unit, second drive control unit, backlash removal control unit, backlash setting control unit)
12 Push tractor unit (continuous sheet conveying device)
13 Paper feed roller
20 Platen
21 Transport roller unit
31 carriage
32 Carriage shaft
32A eccentric shaft
36 print head
37 gears (wheel train)
38 gears (wheel train)
39 stepper motor
39A output gear (wheel train)
50 Reduction gear train (driving force transmission mechanism)
51 Reduction gear train (driving force transmission mechanism)
CSF paper feeder
K cut sheet

Claims (20)

In a drive mechanism control device for controlling a motor drive mechanism using a stepping motor as a drive source to which a holding current for holding a position of the rotor is supplied during standby,
A first drive control for rotating the rotor by a predetermined amount in a first direction which is a direction in which the rotor receives less power from a driving load when the supply of the holding current is stopped before the supply of the holding current is stopped. Department and
An excitation phase storage unit that stores an excitation phase after the rotation of the rotor in the first direction;
When the stepping motor is re-driven, a current is supplied to the stepping motor in the stored excitation phase, and the second drive control unit rotates the rotor by the predetermined amount in a second direction opposite to the first direction. ,
A drive mechanism control device comprising: In a drive mechanism control device for controlling a motor drive mechanism using a stepping motor as a drive source to which a holding current for holding a position of the rotor is supplied during standby,
A supply stop control unit for stopping the supply of the holding current,
A first drive control unit that rotates the rotor by a predetermined amount in a first direction that is a direction in which the rotor receives a drive load when the supply of the holding current is stopped;
An excitation phase storage unit that stores an excitation phase after the rotation of the rotor in the first direction;
When the stepping motor is driven again, a second drive control unit that energizes the stepping motor with the stored excitation phase and rotates the rotor by the predetermined amount in a second direction opposite to the first direction,
A drive mechanism control device comprising: A drive mechanism control device for controlling a motor drive mechanism having a stepping motor to which a holding current for holding the position of the rotor is supplied during standby and having a drive force transmission mechanism for transmitting a drive force of the stepping motor At
Prior to stopping the supply of the holding current, rotating the rotor by a first predetermined amount in a first direction that is a direction in which the rotor maintains a force received from a driving load when the supply of the holding current is stopped. 1 drive control unit,
A second drive control unit that rotates the rotor by the first predetermined amount in a second direction opposite to the first direction;
An excitation phase storage unit that stores an excitation phase after the rotation of the rotor in the second direction;
When the stepping motor is re-driven, a re-energization control unit that re-energizes the stepping motor with the stored excitation phase,
A drive mechanism control device comprising: A drive mechanism control device for controlling a motor drive mechanism having a stepping motor to which a holding current for holding the position of the rotor is supplied during standby and having a drive force transmission mechanism for transmitting a drive force of the stepping motor At
A supply stop control unit for stopping the supply of the holding current,
Prior to stopping the supply of the holding current, rotating the rotor by a first predetermined amount in a first direction that is a direction in which the rotor maintains a force received from a driving load when the supply of the holding current is stopped. 1 drive control unit,
A second drive control unit that rotates the rotor by the first predetermined amount in a second direction opposite to the first direction;
An excitation phase storage unit that stores an excitation phase after the rotation of the rotor in the second direction;
When the stepping motor is re-driven, a re-energization control unit that re-energizes the stepping motor with the stored excitation phase,
A drive mechanism control device comprising: 5. The drive mechanism control device according to claim 3, wherein a backlash setting control unit that rotates the rotor in a third direction to set a substantial backlash in the drive force transmission mechanism. 6.
A backlash removal control unit configured to rotate the rotor by an amount rotated by the backlash setting control unit in a fourth direction opposite to the third direction and remove a predetermined backlash;
A drive mechanism control device comprising: The drive mechanism control device according to any one of claims 1 to 5,
The drive mechanism control device, wherein the supply stop control unit stops the supply of the holding current when a predetermined time has elapsed since the stepping motor entered a standby state. A drive mechanism control method for controlling a motor drive mechanism that uses a stepping motor as a drive source to which a holding current for holding the position of the rotor during standby is supplied,
Prior to the stop of the supply of the holding current, a first drive control step of rotating the rotor by a predetermined amount in a first direction to reduce the force received by the rotor from the drive load when the supply of the hold current is stopped; ,
An exciting phase storing step of storing an exciting phase after the rotation of the rotor in the first direction; and when the stepping motor is re-driven, the stepping motor is re-energized with the stored exciting phase, and the first direction is stored. A second drive control step of rotating the rotor by the predetermined amount in a second direction in the opposite direction;
A driving mechanism control method, comprising: A drive mechanism control method for controlling a motor drive mechanism that uses a stepping motor as a drive source to which a holding current for holding the position of the rotor during standby is supplied,
A first drive control step of rotating the rotor by a predetermined amount in a first direction that is a direction in which the rotor receives a drive load when the supply of the holding current is stopped;
An excitation phase storing step of storing an excitation phase after the rotation of the rotor in the first direction, a holding current supply stopping step of stopping the supply of the holding current after storing the excitation phase,
A second drive control step of re-energizing the stepping motor in the stored excitation phase when the stepping motor is redriven, and rotating the rotor by the predetermined amount in a second direction opposite to the first direction; When,
A driving mechanism control method, comprising: A driving mechanism control method for controlling a motor driving mechanism having a driving power transmission mechanism for transmitting a driving force of the stepping motor using a stepping motor supplied with a holding current for holding the position of the rotor during standby At
Prior to the supply of the holding current, a first rotation of the rotor by a first predetermined amount in a first direction that is a direction in which the rotor maintains a force received from a driving load when the supply of the holding current is stopped. Drive control process,
A second drive control step of rotating the rotor by the first predetermined amount in a second direction opposite to the first direction after the rotation of the rotor in the first drive control step; An excitation phase storage step of storing an excitation phase after rotation of the rotor, and a re-energization step of re-energizing the stepping motor with the stored excitation phase when the stepping motor is re-driven;
A driving mechanism control method, comprising: A driving mechanism control method for controlling a motor driving mechanism having a driving power transmission mechanism for transmitting a driving force of the stepping motor using a stepping motor supplied with a holding current for holding the position of the rotor during standby At
A first drive control step of rotating the rotor by a first predetermined amount in a first direction that is a direction for maintaining the force received by the rotor from the drive load when the supply of the holding current is stopped;
A second drive control step of rotating the rotor by the first predetermined amount in a second direction opposite to the first direction after the rotation of the rotor in the first drive control step; An excitation phase storing step of storing an excitation phase after rotation of the rotor, a holding current supply stopping step of stopping the supply of the holding current after storing the excitation phase,
When the stepping motor is re-driven, a re-energizing step of re-energizing the stepping motor with the stored excitation phase,
A driving mechanism control method, comprising: In the driving mechanism control method according to claim 9 or 10,
After the re-energization, a backlash setting control step of rotating the rotor by a second predetermined amount in a third direction which is a direction in which substantial backlash in the driving force transmission mechanism is set;
In the backlash setting control step, after rotating the rotor by the second predetermined amount in the third direction, the rotor is rotated by the second predetermined amount in a fourth direction opposite to the third direction. A backlash removal control process for removing a predetermined backlash,
A driving mechanism control method, comprising: The drive mechanism control method according to any one of claims 7 to 11,
The driving mechanism control method according to claim 1, wherein in the holding current supply stopping step, the supply of the holding current is stopped when a predetermined time has elapsed since the stepping motor reached a standby state. A printing apparatus that includes a conveyance mechanism that conveys a medium using a stepping motor that is supplied with a holding current for holding the position of the rotor during standby as a driving source, and that prints an image including characters based on input printing data. ,
A supply stop control unit for stopping the supply of the holding current,
A first drive control unit that rotates the rotor by a predetermined amount in a first direction that reduces a force that the rotor receives due to the conveyance of the medium when the supply of the holding current is stopped;
An excitation phase storage unit that stores an excitation phase after the rotation of the rotor in the first direction;
A second drive control unit that re-energizes the stepping motor with the stored excitation phase when the stepping motor is redriven, and rotates the rotor by the predetermined amount in a second direction opposite to the first direction; ,
A recording device comprising: A printing apparatus that includes a conveyance mechanism that conveys a medium using a stepping motor that is supplied with a holding current for holding the position of the rotor during standby as a driving source, and that prints an image including characters based on input printing data. ,
A supply stop control unit for stopping the supply of the holding current,
A first drive control unit that rotates the rotor by a first predetermined amount in a first direction that is a direction that maintains the force received by the rotor due to the conveyance of the medium when the supply of the holding current is stopped; ,
A second drive control unit that rotates the rotor by the first predetermined amount in a second direction opposite to the first direction;
An excitation phase storage unit that stores an excitation phase after the rotation of the rotor in the second direction;
When the stepping motor is re-driven, a re-energization control unit that re-energizes the stepping motor with the stored excitation phase,
A recording device comprising: The recording apparatus according to claim 14,
After the re-energization, a backlash setting control unit that rotates the rotor by a second predetermined amount in a third direction that is a direction in which substantial backlash in the driving force transmission mechanism is set;
A backlash removal control unit that rotates the rotor by the second predetermined amount in a fourth direction opposite to the third direction to remove a predetermined backlash;
A recording device comprising: The recording apparatus according to any one of claims 13 to 15,
The recording apparatus, wherein the supply stop control unit stops the supply of the holding current when a predetermined time has elapsed since the input of the print data was stopped. A printing apparatus that includes a conveyance mechanism that conveys a medium using a stepping motor that is supplied with a holding current for holding the position of the rotor during standby as a driving source and that records an image including characters based on input recording data. In the control method,
A first drive control step of rotating the rotor by a predetermined amount in a first direction that is a direction in which the rotor receives a force caused by the conveyance of the medium when the supply of the holding current is stopped;
An excitation phase storing step of storing an excitation phase after the rotation of the rotor in the first direction, a holding current supply stopping step of stopping the supply of the holding current after storing the excitation phase,
A second drive control step of re-energizing the stepping motor in the stored excitation phase when the stepping motor is redriven, and rotating the rotor by the predetermined amount in a second direction opposite to the first direction; When,
A control method for a recording apparatus, comprising: A printing apparatus that includes a conveyance mechanism that conveys a medium using a stepping motor that is supplied with a holding current for holding the position of the rotor during standby as a driving source and that records an image including characters based on input recording data. In the control method,
A first drive control step of rotating the rotor by a predetermined amount in a first direction that is a direction for maintaining the force received by the rotor due to the conveyance of the medium when the supply of the holding current is stopped;
A second drive control step of rotating the rotor by the predetermined amount in a second direction opposite to the first direction after rotation of the stepping motor in the first drive control step;
An exciting phase storing step of storing an exciting phase after the rotation of the rotor in the second direction, a holding current supply stopping step of stopping the supply of the holding current after storing the exciting phase,
When the stepping motor is re-driven, a re-energizing step of re-energizing the stepping motor with the stored excitation phase,
A control method for a recording apparatus, comprising: The control method for a recording apparatus according to claim 18, wherein
After the re-energization, a backlash setting control step of rotating the rotor by a second predetermined amount in a third direction to set a substantial backlash in the driving force transmission mechanism;
After rotating the rotor in the third direction in the backlash setting control process, rotating the rotor by the second predetermined amount in the third direction in a fourth direction opposite to the third direction, A backlash removal control process for removing a predetermined backlash,
A control method for a recording apparatus, comprising: 20. The control method of a recording device according to claim 17, wherein
The method of controlling a printing apparatus, wherein the holding current supply stopping step stops the supply of the holding current when a predetermined time elapses after the input of the print data is stopped.

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