JP2014106384A - Image forming apparatus and motor control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-function peripheral 100 which properly eliminates counter-electromotive force to be generated by rotation of a roller without changing a circuit board.SOLUTION: A multi-function peripheral 100 includes: an interlock switch 313 which cuts off electric power to be supplied to a motor A control part 309a for controlling a motor A312a when a cover member is opened; sheet determination means 403 which determines whether a sheet is located near a roller by a sheet detection sensor 308 provided near the roller of the motor A312a when the electric power to be supplied to the motor A control part 309a is cut off; and remote means 405 which controls a motor B control part 309b electrically connected to the motor A control part 309a, upon determination that there is a sheet near the roller, to rotate a corresponding motor B 312b on the basis of the supplied electric power even if no rotation instruction is input.

Description

  The present invention relates to an image forming apparatus and a motor control method, and more particularly, to an image forming apparatus and a motor control method that can appropriately remove a counter electromotive force generated by rotation of a roller without changing a circuit board.

  For example, in a copying machine, it is well known that a toner image is transferred to a printing sheet fed from a sheet feeding cassette and fixed at a fixing unit, and the fixed sheet is discharged to the outside. The printing paper that is fed from the paper feeding cassette and discharged is conveyed by a roller that is driven to rotate directly or indirectly from the motor.

  Similarly, in a mechanism for automatically feeding a plurality of printing sheets one by one in a copying machine or the like, the sheet is similarly fed and conveyed by a roller that is rotationally driven by a motor.

  However, in a copying machine or the like, an unexpected situation such as bending of the printing paper being conveyed or biting of foreign matter occurs, the normal conveyance operation of the printing paper is not performed, and the printing paper is jammed in the roller portion (jam: JAM) ) Occurs, the abnormality is detected and the operation is stopped.

  When the operation stops, the user can remove the print paper by opening and closing a door or the like disposed on the main body case and rotating or moving a predetermined dial or knob in order to remove the jammed print paper. Well done.

  However, when removing the jammed printing paper as described above, the user opens the maintenance cover such as a front cover provided in the multifunction machine or the like to remove the printing paper, but the printing paper is rotated by rotating a predetermined dial or knob. If the print paper is pulled out by hand and the jam correction process is performed without removing the ink, the roller follows the movement of the pulled print paper, and the motor also rotates by this rotation.

  Therefore, this rotation causes the motor to function as a generator and an electromotive voltage is generated at both ends of the motor coil, and the electromotive voltage is proportional to the rotational speed. Therefore, the electromotive voltage increases depending on the speed at which the printing paper is pulled out. This may cause problems with the operation of the copier.

  For example, in a copying machine or the like, various electronic circuits are generally controlled by a microcomputer or the like, but even if the copying machine or the like is turned off, the microcomputer or the like malfunctions due to an electromotive force from a motor. There is a concern that the operation will not be performed.

  Of course, when forcibly pulling out the printing paper, it is sufficient to provide a mechanism for idling the roller so that the motor does not rotate following the movement of the printing paper to be pulled out, but the mechanical mechanism becomes complicated. However, if the conventional configuration is to be realized, there is a problem that the configuration needs to be changed.

  In order to solve such a problem, for example, Japanese Patent Application Laid-Open No. 2008-199707 (Patent Document 1) discloses a DC motor, a detection unit that detects an electromotive voltage based on an electromotive force generated by the motor, and the motor. Disclosed is a motor control device comprising: a drive control unit that outputs a drive control signal; and a switching unit that rotates and drives the motor by switching a DC drive current from a DC drive power source to the motor based on the drive control signal. Has been. The drive control unit of the motor control device controls the switching unit so that an electromotive force generated by the electromotive force flows to a common potential of the switching unit when the detection unit detects the electromotive voltage. Thus, the electromotive voltage from the motor is not increased and it is possible to make it less susceptible to the influence, and there is no need to provide a mechanical configuration for idling the rotation transmission mechanism to the motor.

  Japanese Patent Application Laid-Open No. 2010-28972 (Patent Document 2) discloses a motor, a drive unit including a drive system that drives the motor, and a control system that controls the drive system, and a voltage that can drive the motor. An electric device (main body) is disclosed that includes a first power source that outputs a voltage and a second power source that outputs a voltage lower than a voltage at which the motor can be operated. The electrical device includes a cover member capable of adopting an open posture in which the inside of the electrical device body is exposed to the outside and a closed posture in which the interior of the electrical device body is separated from the outside, the first power source, and the second power source. A first path connecting a power source and the drive system, and a power path including a second path connecting the second power source and the control system. Further, the electrical device is provided on the first path, and when the cover member takes a closed position, the electrical device connects the first power source and the drive system, and the second power source and the drive system. When the cover member takes an open posture, the first power supply and the drive system are disconnected and the second power supply and the drive system are connected. With an interlock switch. As a result, even if a counter electromotive force is generated in the motor, the current generated by the counter electromotive force flows into the second power source via the interlock switch. As a result, the drive system is easily prevented from being destroyed. It is said. Furthermore, since the second power supply outputs a voltage lower than the voltage that can operate the motor, the operation of the motor when the cover member is in the open posture can be effectively prevented.

JP 2008-199707 A JP 2010-28972 A

  However, in the inventions described in Patent Documents 1 and 2, a specific circuit board that escapes back electromotive force is mounted on a predetermined circuit board, and the circuit board as a whole is changed. Therefore, there is a problem that man-hours and costs are required.

  On the other hand, if the configuration that misses the back electromotive force can be achieved by software (in software) without mounting the above-described specific circuit board, the above-described man-hours can be reduced and the increase in cost can be prevented. there is a possibility.

  Accordingly, the present invention has been made to solve the above-described problem, and an image forming apparatus and a motor control capable of appropriately removing the counter electromotive force generated by the rotation of the roller without changing the circuit board. It aims to provide a method.

  In order to solve the above-described problems and achieve the object, an image forming apparatus according to the present invention is supported so as to be openable and closable with respect to the apparatus main body, and a cover member capable of opening the inside of the apparatus and a state where power is supplied. Thus, the image forming apparatus includes a plurality of motor control units that rotate a corresponding motor when a predetermined rotation instruction is input, and employs the following configuration.

  That is, the image forming apparatus includes an interlock switch that cuts off power supply to a first motor control unit that controls a first motor that rotates a roller when the cover member is in an open state; When the power supply to the motor control unit is cut off, the sheet detection sensor provided in the vicinity of the roller determines whether a sheet exists in the vicinity of the roller, and the result of the determination When it is determined that a sheet is present in the vicinity of the roller, the second motor control unit electrically connected to the first motor control unit is supplied without the input of the rotation instruction. And remote means for controlling the corresponding second motor to rotate based on the electric power.

  In addition, when the power supply to the first motor control unit is resumed, the remote unit causes the second motor control unit to input the second motor control unit based on the supplied power based on the input of the rotation instruction. The motor is controlled to rotate.

  The remote means supplies the second motor control unit by inputting the rotation instruction when it is determined that the sheet is not present after it is determined that the sheet is present in the vicinity of the roller. Based on the generated electric power, the second motor is controlled to rotate.

  The remote means may determine that the elapsed time from the time when it is determined that the sheet does not exist is determined to be a predetermined time when it is determined that the sheet does not exist after it is determined that the sheet exists near the roller. When the standby time is exceeded, the second motor control unit is controlled to rotate the second motor based on the supplied electric power by inputting the rotation instruction.

  The roller rotated by the first motor is a roller pair of the fixing device.

  The member rotated by the second motor is a polygon mirror.

  In addition, the present invention provides a cover member that is supported so as to be openable and closable with respect to the apparatus body, and a motor that corresponds to a predetermined rotation instruction when power is supplied and a cover member that can open the interior of the apparatus. It can be provided as a motor control method of an image forming apparatus provided with a plurality of motor control units to be rotated.

  That is, in the motor control method, when the cover member is in an open state, a step of cutting off power supply to a first motor control unit that controls a first motor that rotates a roller; and the first motor control When the power supply to the section is interrupted, a step of determining whether or not a sheet exists in the vicinity of the roller by a sheet detection sensor provided in the vicinity of the roller, and as a result of the determination, When it is determined that there is a seat in the vicinity, the second motor control unit electrically connected to the first motor control unit is configured based on the supplied power without the input of the rotation instruction. And a step of controlling the corresponding second motor to rotate. Even with this configuration, the same effect as described above can be obtained.

  Further, the present invention can be provided as a program for causing a computer to circulate individually via a telecommunication line or the like. In this case, the central processing unit (CPU) realizes the control operation in cooperation with each circuit other than the CPU according to the program of the present invention.

  Each means realized by using the program and the CPU can also be configured by using dedicated hardware. The program can also be distributed in a state where it is recorded on a computer-readable recording medium such as a CD-ROM.

  According to the image forming apparatus and the motor control method of the present invention, it is possible to appropriately remove the counter electromotive force generated by the rotation of the roller without changing the circuit board.

1 is a conceptual diagram illustrating an overall configuration inside a multifunction peripheral according to the present invention. It is a conceptual diagram which shows the whole structure of the operation part which concerns on this invention. It is a figure which shows the structure of the control system hardware of the multifunctional device which concerns on this invention. FIG. 2 is a functional block diagram of a multifunction machine according to an embodiment of the present invention. It is a flowchart for showing the execution procedure of the embodiment of the present invention. It is a figure which shows an example of the jam detection screen displayed on the touch panel of embodiment of this invention.

  Hereinafter, an image forming apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. In addition, the following embodiment is an example which actualized this invention, Comprising: The thing of the character which limits the technical scope of this invention is not. In addition, the alphabet “S” added in front of the numbers in the flowcharts means steps.

<Image forming apparatus>
The image forming apparatus according to the present invention will be described below.

  FIG. 1 is a conceptual diagram showing the overall internal configuration of an image forming apparatus according to the present invention. However, details of each part not directly related to the present invention are omitted. The image forming apparatus of the present invention corresponds to, for example, a printer, a single scanner, or a multifunction machine (MFP: Multi Function Peripheral) equipped with a printer, a copy, a scanner, a fax machine, and the like. It functions as an image forming apparatus having a function and a printer function. Hereinafter, for example, the operation of the multifunction peripheral 100 when using the copy function will be briefly described.

  First, when the user performs copying using the multifunction device 100, the document P is placed on the document table 101 provided on the upper surface of the multifunction device 100, and setting conditions for the copy function are input from the operation unit 102. . Further, the user presses a start key provided on the operation unit 102 to cause the multifunction peripheral 100 to start a printing process.

  When the printing process is started, the light emitted from the light source 104 is reflected on the document P placed on the document table 101 in the image reading unit 103. The reflected light is guided to the image sensor 108 by the mirrors 105, 106, and 107. The guided light is photoelectrically converted by the image sensor 108, and the image of the original P is read as image data.

  The read image data is sent to the image forming unit 109 and transferred as a toner image. The image forming unit 109 is provided with a photoconductive drum 110, and the photoconductive drum 110 rotates in a predetermined direction at a constant speed. 111, an exposure unit 112, a developing unit 113, a transfer unit 114, a cleaning unit 115, and the like are stacked.

  The charger 111 uniformly charges the surface of the photosensitive drum 110. The exposure unit 112 irradiates the charged surface of the photosensitive drum 110 with a laser based on the image data to form an electrostatic latent image. The developer 113 forms a toner image by attaching toner to the conveyed electrostatic latent image. The formed toner image is transferred to a recording medium (for example, a sheet or paper) by the transfer device 114. The cleaning unit 115 removes excess toner left on the surface of the photosensitive drum 110. A series of these processes is executed by rotating the photosensitive drum 110.

  The sheets are fed from a plurality of paper feed cassettes provided in the multi-function peripheral 100, for example, the upper cassette 116, the lower left cassette 117, and the lower right cassette 118. Each of the plurality of paper feed cassettes has different paper types. A seat is accommodated. When the sheet is conveyed, the sheet is pulled out from any one of the sheet feeding cassettes 116, 117, and 118 to the conveyance path A by the pickup roller 119. The paper feed cassettes 116, 117, and 118 from which the sheets are pulled out are determined based on settings input by the user to the operation unit 102.

  The sheet pulled out to the conveyance path A is fed between the photosensitive drum 110 of the image forming unit 103 and the transfer device 114 by the conveyance roller 119 and the registration roller 120. When the sheet is fed, the toner image is transferred to the sheet by the transfer unit 114 and conveyed to the fixing device 124.

  When the sheet on which the toner image is transferred passes between a heating roller 122 and a pressure roller 123 (a pair of rollers of the fixing device 121) provided in the fixing device 121, heat and pressure are applied to the toner image, A visible image is fixed on the sheet. The heat amount of the heating roller 122 is optimally set according to the paper type, and the fixing is performed appropriately. A driving unit related to the time from the transfer of the toner image to the fixing on the sheet is referred to as an image printing unit.

  The sheet on which the visible image is fixed further moves on the conveyance path B from the fixing device 121 to the in-body tray 124 (inner tray), and is stacked and accommodated on the in-body tray 124. Further, a side tray 125 is provided on the side surface of the multifunction peripheral 100 separately from the in-body tray 124. When the user inputs the discharge of the side tray 125 as a sheet setting condition, the printed sheet is The paper is discharged via a conveyance path C that continues to the side tray 125.

  When the user inputs double-sided printing or sheet reversal as a setting condition, the sheet is conveyed to another conveyance path D for performing processing input from the normal conveyance paths B and C, and duplex printing is performed. Or inversion processing. Here, the reversal of the sheet means that the sheet is turned upside down when the sheet is discharged. Of course, when the processing is completed, the sheet is guided to the conveyance paths B and C that continue to the in-body tray 124 (side tray 125) and discharged.

  The basic copy function in the multi-function device 100 has been described above. A motor is provided for rotation of the polygon mirror of the exposure unit 112, the registration roller 120, the heating roller 122 of the fixing device 121, the pressure roller 123, and the like related to the copying function. The rotation or the like is controlled by a motor control unit (not shown).

  Also, as shown in FIG. 1, a sheet conveyance path is determined based on a setting entered by the user, and the sheet conveyance path is configured by combining a plurality of conveyance paths A, B, C, and D. . For this reason, sheet detection sensors (reflective photosensors) 10a to 10n that detect a conveyance failure of the sheet on the conveyance path (detect the presence of paper) correspond to the plurality of conveyance paths A, B, C, and D. A predetermined number is provided at a predetermined location.

  Here, the predetermined place is a place where a defective conveyance of the sheet occurs with a high probability due to a drive member provided in the vicinity of the place or a space restriction, specifically, the vicinity of the front and back of the roller for feeding the sheet. It is a place.

  Also, a cover member that can be opened and closed from the main body of the multifunction peripheral 100, for example, a cover member 127 that can be opened and closed from the front surface 126 of the main body is provided in the vicinity of the heating roller 122 and the pressure roller 123. Yes. Therefore, if the sheet detection sensor detects that the conveyance of the sheet is stagnated by the roller, the user can open the cover member near the roller and remove the sheet. is there.

  Each of the cover members is provided with a cover open / close detection sensor for detecting the open state of the cover member. Here, for example, a cover open / close detection sensor for detecting the open state of the cover member 127 on the front face 126 of the main body corresponds to the interlock switch 128 of the multifunction peripheral 100, and is interlocked with the opening / closing of the cover member 127. Thus, the contact of the interlock switch 128 is physically opened or closed. Specifically, when the cover member 127 is in an open state, the interlock switch 128 is opened, and power supply to the control unit of the motor that rotates the roller is cut off. On the other hand, when the cover member 127 is in the closed state, the interlock switch 128 is closed, and power supply to the motor control unit of the motor is resumed. The motor control unit controls rotation of the motor. Specifically, the motor control unit is configured not to rotate the corresponding motor unless it receives a predetermined rotation instruction (such as a drive signal) from the multi-function peripheral 100 even when receiving a predetermined power supply. Yes. In other words, the motor control unit rotates the motor in response to the rotation instruction and consumes the electric power only when the electric power is supplied and the rotation instruction is input. With this configuration, the motor is prevented from rotating freely.

  FIG. 2 is a conceptual diagram showing the overall configuration of the operation unit according to the present invention. The user uses the operation unit 102 to input setting conditions for image formation as described above, and to confirm the input setting conditions. When the setting conditions are input, a touch panel 201 (operation panel), a touch pen 202, and operation keys 203 provided in the operation unit 102 are used.

  The touch panel 201 adopts an analog resistance film method, and has a structure in which a translucent upper film and a lower glass substrate are overlapped via a spacer, and each of the upper film and the lower glass substrate. A transparent electrode layer made of ITO (Indium Tin Oxide) or the like is provided on the facing surface. Further, when the upper film is pressed by the user, the transparent electrode layer on the upper film side and the transparent electrode layer on the lower glass substrate side corresponding to the pressed position are in contact with each other. By applying a voltage to the upper film or the lower glass substrate and taking out a voltage value corresponding to the pressed position from the lower glass substrate or the upper film, a coordinate value (pressed position) corresponding to the voltage value is detected. When the detected pressing position is included in a display area such as a setting item key in the screen displayed on the touch panel, the contents of the setting item are input (set).

  In addition, a display unit such as an LCD (Liquid Crystal Display) is provided below the lower glass substrate. The display unit displays a screen such as an initial screen or a copy function screen, for example. A specific screen is displayed above. As a result, the touch panel 201 has both a function of inputting setting conditions and the like and a function of displaying the setting conditions and the like.

  In addition, a touch pen 202 is provided in the vicinity of the touch panel 201, and when the user touches the tip of the touch pen 202 with the touch panel 201, the coordinate value corresponding to the contact position (pressed position) is the same as described above. Then, the user can press and select the displayed setting item key or the like with the touch pen 202.

  Further, a predetermined number of operation keys 203 are provided in the vicinity of the touch panel 201, and for example, a ten key 204, a start key 205, a clear key 206, a stop key 207, a reset key 208, and a power key 209 are provided.

  Next, the configuration of the control system hardware of the multifunction peripheral 100 will be described with reference to FIG. FIG. 3 is a schematic configuration diagram of control system hardware in the multifunction machine. However, details of each part not directly related to the present invention are omitted.

  The control circuit of the MFP 100 includes a CPU (Central Processing Unit) 301, a ROM (Read Only Memory) 302, a RAM (Random Access Memory) 303, an HDD (Hard Disk Drive) 304, a driver 305 corresponding to each driving unit, and the above-described components. The operation unit 306 (102), the sheet detection sensor 307, the cover open / close detection sensor 308, the motor control unit 309 (for example, the motor A control unit 309a and the motor B control unit 309b), and the 5V power supply 310 are connected via the internal bus 311. Electrically connected.

  The CPU 301 receives power supply from the 5V power supply 310, uses, for example, the RAM 303 as a work area, executes a program stored in the ROM 302, HDD 304, and the like, and based on the execution result, the driver 305 , Send / receive data from the operation unit 306, the sheet detection sensor 307, the cover open / close detection sensor 308, and the motor control unit 309, and send (input) predetermined data, instructions, commands, and signals. The operation of each drive unit shown in FIGS. 1 and 2 is controlled.

  Since the motor 312 (for example, the motor A 312a and the motor B 312b) is not driven by the electric power of the 5V power supply 310, the motor control unit 309 (the motor A control unit 309a and the motor B control unit 309b) and the interlock switch 313 (128). ) To the 24V power supply 314. When the CPU 301 closes the interlock switch 313 and inputs a rotation instruction to the motor control unit 309, the motor 312 is rotated by receiving power from the 24V power source 314. On the other hand, the CPU 301 cuts off the power supply to the motor 312 by not inputting the rotation instruction or opening the interlock switch 313. The motor 312 is generally electrically connected to each other via each motor control unit 309, and is configured to receive power supply from one 24V power source 314 via each motor control unit 309. ing.

  The interlock switch 313 physically opens and closes the contact of the interlock switch 313 in conjunction with the opening and closing of the cover member 127 as described above. For example, a protrusion is provided in a predetermined position of the cover member 127 in advance, and when the cover member 127 is in an open state, the protrusion is separated from the contact of the interlock switch 313 to open the contact, and the cover In the closed state of the member 127, the protrusion is configured to contact the contact of the interlock switch 313 to close the contact.

  The 5V power source 310 and the 24V power source 314 are electrically connected to an AC power source 315. The 5V power source 310 and the 24V power source 314 directly receive AC power from the AC power source 315 and adjust the power to predetermined power. It is configured to supply to.

  Note that the CPU 301 also realizes the respective means (shown in FIG. 4) other than the drive unit, which will be described later, when the CPU 301 executes a program. The ROM 302, the HDD 304, and the like store programs and data for realizing each means described below.

<Embodiment of the present invention>
Next, the configuration and execution procedure according to the embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG. 4 is a functional block diagram of the MFP 100 according to the present invention. FIG. 5 is a flowchart for illustrating the execution procedure of the present invention.

  For example, when the user turns on the MFP 100, places the document P on the document table 101, and inputs a desired setting condition using the operation unit 102, the display receiving unit 401 of the MFP 100 is displayed. The input of the setting condition is accepted, and an operation screen (not shown) corresponding to the setting condition is displayed on the touch panel 201.

  Next, when the user confirms the input setting condition while looking at the operation screen on the touch panel 201 and presses the start key 205, the display receiving unit 401 receives the pressing of the start key 205. This is notified to the image forming means 402. Upon receiving the notification, the image forming unit 402 reads an image of the document P placed on the document table 101 based on the setting condition, and removes sheets from the sheet feeding cassettes 116, 117, and 118 corresponding to the setting condition. The sheet is pulled out to form the read image on the sheet. Then, the image forming unit 402 conveys the sheet on which the image has been formed to the fixing device 121, performs a fixing process, and discharges the sheet to the trays 124 and 125 corresponding to the setting conditions.

  When the MFP 100 is turned on or the image formation is started, the sheet determination unit 403 of the MFP 100 performs predetermined processing on the sheet transport paths A, B, C, and D. The sheet detection sensor 307 provided at the location is monitored to determine whether or not a sheet exists at the predetermined location, and whether or not the sheet is jammed at the predetermined location on the conveyance path due to some cause. To monitor.

  Similarly to the above, when the multifunction device 100 is turned on or the image formation is started, the cover open / close determination means 404 of the multifunction device 100 is provided with a cover provided on each of the plurality of cover members. The open / close detection sensor 308 is monitored to determine whether or not the predetermined cover member has changed from the closed state to the open state (FIG. 5: S101). The case where the predetermined cover member is opened will be described later.

  Here, when the sheet is jammed at a predetermined position in the conveyance path during the image formation, for example, the sheet is sandwiched between the heating roller 122 and the pressure roller 123 of the fixing device 121. When a paper jam occurs, the sheet determination unit 403 uses the sheet detection sensor 308 (10 g, 10 m, etc.) provided in the vicinity of the heating roller 122 and the pressing roller 123 to detect the heating roller 122 or the pressing roller. It is determined that there is a sheet near 123, and that is notified to the display receiving unit 401. Upon receiving the notification, the display receiving unit 401 displays a jam detection screen indicating that the sheet is jammed in the vicinity of the fixing device 121 on the touch panel 201.

  On the jam detection screen 600, as shown in FIG. 6, a message 601 indicating that the sheet is jammed in the vicinity of the fixing device 121 and a cover member 127 in the vicinity of the fixing device 121 are opened to prompt the user to remove the sheet. A message 602 to that effect and a contact information 603 to the service person are displayed. Thus, the user can recognize that a paper jam has occurred and remove the jammed sheet.

  The sheet determination unit 403 notifies the image forming unit 402 to that effect, and the image forming unit 402 that has received the notification temporarily interrupts the above-described image formation.

  Here, when the user changes the cover member 127 of the main body front surface 126 of the multifunction peripheral 100 from the closed state to the open state while looking at the jam detection screen 600 (FIG. 5: S102 YES), it corresponds to the open state of the cover member 127. The interlock switch 313 then controls the motor A control unit 309a (the first roller) for controlling the rotation of the heating roller 122 and / or the pressure roller 123 (the first roller) in the vicinity of the opened cover member 127. The power supply to the motor control unit is cut off (FIG. 5: S103).

  Specifically, the interlock switch 313 supplies power to the motor A control unit 309a (supplying a DC voltage) 314 corresponding to the open state of the cover member 127, and the motor A A contact point provided between the control unit 309a and the control unit 309a is opened (turned off). Then, the electrical connection between the 24V power source 314 and the motor A control unit 309a is cut, and the power supply to the motor A control unit 309a is cut off.

  As a result, while the user is removing the sheet in the vicinity of the heating roller 122 and the pressure roller 123, the heating roller 122 and the pressure roller 123 are connected to the motor A 312a by the electric power. It is no longer possible to rotate through the, and safety can be improved.

  The motor A control unit 309a is electrically connected to a motor B control unit 309b that rotates another member that requires rotation (for example, a polygon mirror of the exposure unit 112) via a motor B 312b (second motor). Has been. Further, the motor B control unit 309b is supplied with power from the 24V power source 314 via the interlock switch 313. Therefore, when the interlock switch 313 is opened, the power supply to the motor B control unit 309b is automatically cut off.

  Next, when the contact of the interlock switch 313 is opened, the sheet determination unit 403 is moved by a sheet detection sensor 308 (10 g, 10 m, etc.) provided in the vicinity of the heating roller 122 and the pressure roller 123. It is determined whether or not a sheet exists in the vicinity of the heating roller 122 and the pressure roller 123 (FIG. 5: S104).

  As a result of the determination, if a sheet exists in the vicinity of the heating roller 122 and the pressure roller 123 (FIG. 5: S104 YES), in other words, the sheet may be sandwiched between the heating roller 122 and the pressure roller 123. When the property is high, when the user pulls out the sheet, the motor A 312a rotates through the heating roller 122 and the pressure roller 123, and there is a possibility that a counter electromotive force is generated. In this case, the sheet determination unit 403 notifies the remote unit 405 to that effect, and the remote unit 405 sends the motor B control unit 309b electrically connected to the motor A control unit 309a to the rotation instruction. Even if there is no input, the corresponding motor B 312b is controlled to rotate based on the supplied power (FIG. 5: S105). That is, the remote means 405 remotely turns on the motor B control unit 309b.

  Thus, when the user removes the sheet sandwiched between the heating roller 122 and the pressure roller 123, the heating roller 122 and the pressure roller 123 are temporarily rotated, and the motor A 312a ( Even if a back electromotive force is generated in the drive coil), the generated back electromotive force flows to the motor B control unit 309b via the motor A control unit 309a, and the motor B control unit 309b In spite of no input of the rotation instruction, the counter electromotive force is consumed to rotate the motor B 312b. Then, since the counter electromotive force is consumed by the rotation of the motor B 312b, it does not remain in the motor A control unit 309a, the motor B control unit 309b, and the like. As a result, it is possible to prevent other circuit boards from being damaged by the remaining counter electromotive force, and allow the user to remove the sheet while maintaining safety.

  Further, conventionally, it is necessary to provide a specific circuit board for releasing the remaining counter electromotive force and to change the entire circuit board related to the motor A control unit 309a, which requires man-hours and costs. In the present invention, the motor B 312b is shifted to a rotatable state by software processing such as control of the motor B control unit 309b, and the counter electromotive force is consumed. Therefore, it is necessary to provide the specific circuit board. In addition, the man-hours and costs required for this can be reduced.

  The member that rotates the motor B 312b is a member that is not related to the heating roller 122 and the pressure roller 123, such as a polygon mirror of the exposure unit 112 at a position away from the heating roller 122 and the pressure roller 123. In this case, the counter electromotive force can be safely consumed without danger to the user.

  As a result of the determination, a case where no sheet exists in the vicinity of the heating roller 122 and the pressure roller 123 (FIG. 5: S104 NO) will be described later.

  Here, in S106, when the user changes the cover member 127 from the open state to the closed state (FIG. 5: S107 YES) without removing the sheet for some reason (FIG. 5: S106 NO), for example, the cover member. In response to the closed state of 127, the interlock switch 313 resumes the power supply to the motor A control unit 309a (FIG. 5: S108).

  Specifically, the interlock switch 313 closes (turns on) the contact in response to the closed state of the cover member 127. Then, the 24V power supply 314 and the motor A control unit 309a are electrically connected.

  As a result, the electric power from the 24V power source 314 is supplied to the motor A control unit 309a, and the motor A control unit 309a performs the motor A 312a based on the electric power according to a rotation instruction from the image forming unit 402 and the like. As a result, the heating roller 122 and the pressure roller 123 can be rotated.

  When the interlock switch 313 resumes the power supply to the motor A control unit 309a, the remote unit 405 causes the motor B control unit 309b to input the rotation instruction based on the supplied power. Then, the motor B 312b is controlled to rotate (FIG. 5: S109). That is, the remote means 405 remotely turns off the motor B control unit 309b.

  As a result, even if the motor B 312b can receive power supply, the motor B 312b will not rotate unless a predetermined rotation signal is input to the motor B control unit 309b. Can be prevented.

  However, as described above, if the user does not remove the sheet at 106 (FIG. 5: S106 NO) and closes the cover member 127 (FIG. 5: S107 YES), the sheet determination means 403 Since it is determined that the sheet is present via the sheet detection sensor 308 (10 g, 10 m, etc.), the image forming unit 402 continues to interrupt the image formation described above.

  By the way, in S106, when the user removes the sheet sandwiched between the heating roller 122 and the pressure roller 123, the sheet determination unit 403 detects the sheet detection sensor 308 in the vicinity of the heating roller 122 and the pressure roller 123. (10 g, 10 m, etc.), it is determined that the sheet does not exist (FIG. 5: S106 YES), and that is notified to the remote means 405. Upon receiving the notification, the remote unit 405 controls the motor B control unit 309b to rotate the motor B 312b based on the supplied power in response to the input of the rotation instruction (remote OFF).

  Here, the remote unit 405 may remotely turn off the motor B control unit 309b. However, for example, the remote unit 405 uses a timer provided in advance to form the seat. Is waited until the elapsed time from the time when it is determined that there is no longer exceeds a predetermined standby time (for example, 1 second, 2 seconds, several seconds, etc.), and the elapsed time exceeds the predetermined standby time (FIG. 5). : S110), the motor B control unit 309b is remotely turned off (FIG. 5: S111). As a result, as described above, it is possible to prevent the motor B 312b corresponding to the motor B control unit 309b from rotating freely.

  The remote means 405 waits for the waiting time and then remotely turns off the motor B control unit 309b, for example, when it is determined that the sheet does not exist, in other words, the user has removed the sheet. As soon as the motor B control unit 309b is remotely turned off at that time, the back electromotive force generated by removing the sheet is still flowing to the remote B motor B control unit 309b (the motor B 312b is rotated). During this time, the motor B control unit 309b is remotely turned off, and there is a possibility that the counter electromotive force that has not been consumed remains in the motor A control unit 309a and the motor B control unit 309b. Therefore, after waiting for a predetermined waiting time from the time when the sheet is extracted, the motor B control unit 309b is remotely turned off to prevent the back electromotive force from remaining, and the substrate due to the remaining back electromotive force. It becomes possible to reliably prevent the circuit from being damaged.

  On the other hand, when the sheet determination unit 403 determines that the sheet does not exist via the sheet detection sensor 308 (10 g, 10 m, etc.), it notifies the image forming unit 402 to that effect and receives the notification. The image forming unit 402 resumes the temporarily interrupted image formation. In this case, the image forming unit 402 inputs a predetermined rotation signal to the motor A control unit 309a and the motor B control unit 309b, and at a predetermined timing, the corresponding heating roller 122, pressure roller 123, polygon mirror Will be controlled. When the sheet determination unit 403 determines that the sheet does not exist, the display reception unit 401 may erase the jam detection screen 600 displayed on the touch panel 201.

  The procedure from S107 after S111 is the same as that described above, although S109 overlaps with S111.

  By the way, in S104, as a result of the determination, if there is no sheet in the vicinity of the heating roller 122 and the pressure roller 123 (FIG. 5: S104 NO), in other words, the sheet is interposed between the heating roller 122 and the pressure roller 123. When the is not sandwiched, there is no possibility that the heating roller 122 and the pressure roller 123 rotate and a counter electromotive force is generated. Therefore, in this case, the sheet determination unit 403 notifies the remote unit 405 to that effect, and the remote unit 405 that has received the notification remotely turns off the motor B control unit 309b (FIG. 5: S112).

  In this case, since the roller is not rotated by removing the sheet and no back electromotive force is generated, the motor B control unit 309b is remotely turned off to correspond to the motor B control unit 309b as described above. This prevents the motor B 312b that rotates without meaning.

  Then, when the user completes the predetermined work and closes the cover member that has been opened (FIG. 5: S113 YES), the interlock switch 313 corresponds to the closed state of the cover member 127, and the interlock switch 313 The power supply to the A control unit 309a is resumed (FIG. 5: S114).

  In this case, since the remote unit 405 has already remotely turned off the motor B control unit 309b, the image forming unit 402 can directly control the motor B 312b via the motor B control unit 309b. It becomes.

  For example, if the user who has completed the above operation presses the start key 205 again, the display receiving unit 401 receives the pressing of the start key 205, and the image forming unit 402 is based on the setting condition. Image formation is resumed.

  As described above, when the cover member 127 of the heating roller 122 and / or the pressure roller 123 rotated by the motor A 312a is opened, the multifunction peripheral 100 according to the present invention moves to the motor A control unit 309a that controls the motor A 312a. When the power supply to the interlock switch 313 and the motor A control unit 309a is cut off, the sheet detection sensor 308 (10g, provided near the heating roller 122 and the pressure roller 123) is cut off. 10 m, etc.), the sheet determination means 403 for determining whether or not a sheet exists in the vicinity of the heating roller 122 and the pressure roller 123, and as a result of the determination, in the vicinity of the heating roller 122 and the pressure roller 123. When it is determined that a sheet exists, the motor B control unit 309a electrically connected to the motor A control unit 309a is controlled. The part 309b, even without an input of the rotation instruction, characterized in that it comprises a remote unit 405 for controlling to rotate the motor B312b corresponding based on the supplied power.

  Thereby, it is possible to appropriately remove the counter electromotive force generated by the rotation of the roller without changing the circuit board.

  In the embodiment of the present invention, there is no particular limitation on the remote ON / OFF of the motor A control unit 309a. For example, the interlock switch 313 cuts off the power supply to the motor A control unit 309a. At this time, the remote unit 405 may remotely turn on or remotely turn off the motor A control unit 309a. As a normal operation, the remote unit 405 controls the motor A so that the motor A does not rotate freely by remotely turning off any motor control unit 309 as well as opening the interlock switch 313. Only the motor control unit 309 that controls the motors of the nearby rollers may be remotely turned on so that the rollers can be easily rotated by the user pulling out the sheet.

  In the embodiment of the present invention, the rotation of the motor A 312a corresponds to the heating roller 122 or the like, but other rollers may be used, for example, the conveyance roller 119 or the registration roller 120 may be used.

  In the embodiment of the present invention, the interlock switch 313 is configured to cut off the power supply to the motor A control unit 309a corresponding to the cover member 127 in the vicinity of the heating roller 122 and the like. The relationship between the heating roller 122 and the like and the cover member 127 may be any relationship, for example, a cover member (maintenance cover member) that covers the heating roller 122 or the like in the closed state and exposes the heating roller 122 or the like in the opened state. ), The power supply to the motor A control unit 309a may be cut off.

  In the embodiment of the present invention, the interlock switch 313 is configured to physically control the opening and closing of the contacts in conjunction with the opening and closing of the cover member 127, but other configurations may be used. For example, the interlock switch 313 is a normal cover open / close detection sensor (specifically, a cover open / close detection sensor for detecting the open / close state of the cover member based on infrared rays or the like). When the cover member 127 is in an open state, an interlock unit that cuts off the power supply to the motor A control unit 309a that controls the motor A 312a may be configured as software. The interlock means restarts the power supply to the motor A control unit 309a when the cover member 127 is closed. Even if comprised in this way, there exists the same effect.

  In the embodiment of the present invention, the MFP 100 is configured to include each unit. However, a program that realizes each unit may be stored in a storage medium, and the storage medium may be provided. In the configuration, the multifunction device 100 reads the program, and the multifunction device 100 implements the respective units. In that case, the program itself read from the recording medium exhibits the effects of the present invention. Furthermore, it is possible to provide a method for storing the steps executed by each means in a hard disk.

  As described above, the image forming apparatus and the motor control method according to the present invention are useful not only for multi-function machines, but also for copying machines, printers, and the like, and the counter electromotive force generated by the rotation of the rollers without changing the circuit board. It is effective as an image forming apparatus and a motor control method that can be appropriately removed.

DESCRIPTION OF SYMBOLS 100 MFP 121 Fixing device 122 Heating roller 123 Pressure roller 307 Sheet detection sensor 308 Cover opening / closing detection sensor 309 Motor control unit 312 Motor 313 Interlock switch 401 Display receiving unit 402 Image forming unit 403 Sheet determining unit 404 Cover opening / closing detecting unit 405 Remote means

Claims (9)

A cover member that is supported to be openable and closable with respect to the apparatus main body, and a plurality of motor controls that rotate the corresponding motors when a predetermined rotation instruction is input while power is supplied. In an image forming apparatus having a section,
When the cover member is in an open state, an interlock switch that cuts off power supply to the first motor control unit that controls the first motor that rotates the roller;
When the power supply to the first motor control unit is interrupted, a sheet determination unit that determines whether a sheet exists near the roller by a sheet detection sensor provided in the vicinity of the roller;
As a result of the determination, when it is determined that a sheet is present in the vicinity of the roller, the second motor control unit electrically connected to the first motor control unit has no input of the rotation instruction. An image forming apparatus comprising: a remote unit configured to control the corresponding second motor to rotate based on the supplied electric power. When the power supply to the first motor control unit is resumed, the remote means causes the second motor control unit to input the second motor based on the supplied power in response to the input of the rotation instruction. The image forming apparatus according to claim 1, wherein the image forming apparatus is controlled to rotate. When it is determined that the sheet does not exist after it is determined that there is a sheet in the vicinity of the roller, the remote unit is supplied with the second motor control unit by inputting the rotation instruction. The image forming apparatus according to claim 1, wherein the second motor is controlled to rotate based on electric power. When it is determined that the sheet does not exist after it is determined that a sheet is present in the vicinity of the roller, the remote means determines that the elapsed time from the determination that the sheet does not exist is a predetermined waiting time. If it exceeds, the said 2nd motor control part will be controlled to rotate said 2nd motor based on the supplied electric power by the input of the said rotation instruction | indication. The image forming apparatus described. The image forming apparatus according to claim 1, wherein the roller rotated by the first motor is a roller pair of a fixing device. The image forming apparatus according to claim 1, wherein the member rotated by the second motor is a polygon mirror. A cover member that is supported to be openable and closable with respect to the apparatus main body, and a plurality of motor controls that rotate the corresponding motors when a predetermined rotation instruction is input while power is supplied. In a motor control method of an image forming apparatus provided with a section,
Cutting off the power supply to the first motor control unit that controls the first motor that rotates the rollers when the cover member is in an open state;
When power supply to the first motor control unit is interrupted, a step of determining whether or not a sheet exists in the vicinity of the roller by a sheet detection sensor provided in the vicinity of the roller;
As a result of the determination, when it is determined that a sheet is present in the vicinity of the roller, the second motor control unit electrically connected to the first motor control unit has no input of the rotation instruction. And a step of controlling the corresponding second motor to rotate based on the supplied electric power.   A program for causing a computer to execute the motor control method according to claim 7.   A computer-readable storage medium storing the program according to claim 8.

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