JP2015194624A - Motor driving device and image forming apparatus including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor driving device which is capable of preventing the failures of a motor driving circuit and a circuit system connected to the motor driving circuit by avoiding a current caused by the generation of a counter electromotive force from flowing around to the motor driving circuit, even when the counter electromotive force is generated in a motor, and to provide an image forming apparatus including the motor driving device.SOLUTION: The motor driving device includes the motor, the motor driving circuit for driving the motor, a connection circuit for connecting the motor and the motor driving circuit, and a cover member capable of taking an opening state where the inside of the main body of the motor driving device is exposed and a closing state where the inside of the main body of the motor driving device is covered. The connection circuit for connecting the motor and the motor driving circuit disconnects the motor and the motor driving circuit, when the cover member takes the opening state, and connects the motor and the motor driving circuit, when the cover member takes the closing state.

Description

  The present invention relates to a motor drive device and an image forming apparatus such as a copying machine, a multifunction peripheral, and a printer including the motor drive device.

  Examples of the motor drive device include a motor, a motor drive circuit that drives the motor, a connection circuit that connects the motor and the motor drive circuit, an open state that exposes the inside of the motor drive device main body, and the motor drive device main body. And a cover member that can be in a closed state that covers the inside.

  Such a motor drive device is provided in an image forming apparatus such as a copying machine, a multifunction machine, or a printer. In this case, as the motor driving device, in addition to a printing device that forms (prints) an image on a recording sheet, an image reading device that reads an image of a document, or a sheet supply device that supplies a recording sheet to a printing device (specifically, A single-stage or multi-stage type paper feed desk or a large capacity paper feed tray) can be exemplified.

  In such a motor drive device, when the motor is rotated by an external force when the cover member is in the open state, a counter electromotive force is generated in the motor.

  For example, when a motor driving device is provided in an image forming apparatus, the motor driving device (specifically, a printing device, a sheet feeding device, or an image reading device) is clogged with a sheet (specifically, recording paper or a document). When a jammed sheet is pulled out, the transport roller that holds the sheet is rotated along with the movement of the sheet when the sheet is pulled out. As a result, a counter electromotive force is generated in the motor.

  Then, the current accompanying the generation of the counter electromotive force flows from the motor to the motor drive circuit through the connection circuit. At this time, in a circuit system connected to the motor drive circuit (for example, a power supply circuit that supplies power to the motor drive circuit or another load when another load is connected to the power supply circuit), the circuit is connected to the motor drive circuit. If the back electromotive force cannot be absorbed, the back electromotive force raises the power supply voltage of the motor drive circuit. As a result, a motor drive circuit or a circuit system connected to the motor drive circuit (for example, a power supply circuit that supplies power to the motor drive circuit or another load when another load is connected to the power supply circuit) breaks down. There is a fear.

  In this regard, in Patent Document 1, in an electrical device, when the cover member is in the open position, the drive system is disconnected from the first power source (specifically, the 24V power source) by the interlock switch. Even if a counter electromotive force is generated in the motor in this state, the current generated by the counter electromotive force is supplied to the second power source via the interlock switch. A technique for preventing the motor drive unit from being broken is disclosed.

JP 2010-28972 A

  However, in the conventional configuration described in Patent Document 1, when the back electromotive force generated by the motor is so large that it cannot be absorbed by the circuit connected to the second power source (specifically, the 5V power source), As a result, the voltage of the second power supply rises above the specified voltage (rated voltage), and if another load is connected to the motor drive unit or the second power supply, an excessive voltage is applied to the other load, and the motor The drive unit and other loads may be destroyed.

  Therefore, according to the present invention, when the cover member is in the open state, even if the motor is rotated by an external force and a counter electromotive force is generated in the motor, the current accompanying the generation of the counter electromotive force wraps around the motor drive circuit. Accordingly, an object of the present invention is to provide a motor drive device that can prevent a motor drive circuit and a circuit system connected to the motor drive circuit from failing, and an image forming apparatus including the motor drive device.

  In order to solve the above-described problems, the present invention provides the following motor drive device and image forming apparatus.

(1) Motor drive device Motor, motor drive circuit that drives the motor, connection circuit that connects the motor and the motor drive circuit, an open state that exposes the inside of the main body of the motor drive device, and the motor drive A motor drive device comprising a cover member capable of taking a closed state covering the inside of the main body of the device, wherein the connection circuit for connecting the motor and the motor drive circuit is configured so that the cover member is in the open state. The motor is configured to block the connection between the motor and the motor drive circuit when taking, and to connect the motor and the motor drive circuit when the cover member takes the closed state. Drive device.

(2) Image forming apparatus An image forming apparatus comprising the motor driving device according to the present invention.

  In the present invention, the conveyance roller that conveys the sheet and the motor are configured to work together, and the cover member is configured to take the open state when the sheet is removed from the conveyance roller. An aspect can be illustrated.

  In the present invention, the connection circuit that connects the motor and the motor drive circuit is connected to both the body of the motor drive device and the cover member when the cover member is in a closed state, An example comprising a drawer connector provided so that the connection is released when the cover member is in an open state, and a connection wiring that connects the motor and the motor drive circuit via the drawer connector it can.

  According to the present invention, when the cover member is in the open state, even if the motor is rotated by an external force and a counter electromotive force is generated in the motor, the current accompanying the generation of the counter electromotive force wraps around the motor drive circuit. This can avoid the failure of the motor drive circuit and the circuit system connected to the motor drive circuit.

1 is a perspective view illustrating an appearance of an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a front view schematically showing the image forming apparatus shown in FIG. 1. 1 is a circuit diagram showing an example of a basic configuration motor circuit that rotationally drives a motor in a printing apparatus provided in the image forming apparatus and an example of a basic configuration motor circuit that rotationally drives a motor in the image reading apparatus provided in the image forming apparatus. It is. FIG. 9 is an explanatory diagram for explaining a process of releasing a jammed state of a recording sheet when the recording sheet is jammed while the recording unit forms an image on the printing unit in the printing apparatus, and the cover member is opened. It is a perspective view which shows the state currently carried out. FIG. 7 is an explanatory diagram for explaining a recording sheet jamming release process when a recording sheet is jammed while the recording sheet is being pulled out by the sheet supply unit in the printing apparatus, and the cover member is opened. It is a front view showing roughly the state. In the image reading apparatus, it is an explanatory diagram for explaining a document jam release process when a document jam occurs while the document is being scanned by the scanning unit, and the cover member is opened FIG. FIG. 4 is a circuit diagram showing a state in which a counter electromotive force is generated in the motor in the motor circuit having the basic configuration shown in FIG. 3. In the motor circuit with the basic configuration shown in FIG. 7, when the connection wiring connecting the power supply circuit and the motor drive circuit is cut off by the interlock mechanism, the jammed recording sheet or document is pulled out and a back electromotive force is generated in the motor. The waveform showing the output voltage of the power supply circuit, the power supply voltage of the motor driving circuit, and the voltage between the terminals of the power feeding terminal of the motor, (a) is a waveform showing the output voltage of the power supply circuit, (b) Is a waveform showing the power supply voltage of the motor drive circuit, and (c) is a waveform showing the voltage between terminals of the power feeding terminals of the motor. 6 is a circuit diagram illustrating an example of a wiring connection state of a motor circuit in the printing apparatus according to the first embodiment and the second embodiment and an example of a wiring connection state of a motor circuit in the image reading apparatus according to the second embodiment. FIG. It is a front view which shows roughly an example of the arrangement state of the switch provided in the printing apparatus which concerns on 1st Embodiment. It is a front view which shows roughly an example of the arrangement state of the switch provided in the printing apparatus which concerns on 2nd Embodiment. It is a front view which shows roughly an example of the arrangement state of the switch provided in the image reading apparatus which concerns on 3rd Embodiment. FIG. 10 is a circuit diagram illustrating an example of a wiring connection state of a motor circuit in a printing apparatus according to a fourth embodiment and a fifth embodiment and an example of a wiring connection state of a motor circuit in an image reading apparatus according to a sixth embodiment. It is a perspective view which shows an example of the drawer connector used for a printing apparatus and an image reading apparatus. It is a front view which shows roughly an example of the arrangement | positioning state of the drawer connector provided in the printing apparatus which concerns on 4th Embodiment. It is a front view which shows roughly an example of the arrangement | positioning state of the drawer connector provided in the printing apparatus which concerns on 5th Embodiment. It is a front view showing roughly an example of the arrangement state of the drawer connector provided in the image reading device concerning a 6th embodiment.

  Embodiments according to the present invention will be described below with reference to the drawings.

[Image forming apparatus]
FIG. 1 is a perspective view showing an appearance of an image forming apparatus 1 according to an embodiment of the present invention. FIG. 2 is a front view schematically showing the image forming apparatus 1 shown in FIG. 1 and 2 and FIGS. 4 to 6, FIG. 10 to FIG. 12, and FIG. 15 to FIG. 17 to be described later, the symbol X indicates the depth direction, and the symbol Y indicates the width direction. , Z indicates the vertical direction.

  As shown in FIGS. 1 and 2, the image forming apparatus 1 includes an image reading device 2 and a printing device 10, and a recording sheet such as a sheet is printed by the printing device 10 based on image data read by the image reading device 2. Image formation is performed on P (an example of a sheet). Here, the image reading device 2 and the printing device 10 constitute an example of a motor driving device according to the present invention.

  The image reading apparatus 2 includes a scanning unit 21 and a document conveying unit 22. The document G (an example of a sheet) conveyed by the document conveying unit 22 is read by the scanning unit 21 or placed on a document table 212. The original G is read by the scanning unit 21 and an image of the read original G is output as image data.

  The printing apparatus 10 includes a printing unit 101 that performs image formation (printing) and a sheet conveyance unit 102 that conveys a recording sheet P.

  The printing unit 101 includes a photosensitive drum 11, a charger 12, an optical scanning device 13, a developing device 14, a transfer device 15, a drum cleaning device 16, and a fixing device 17.

  The charger 12 is configured to uniformly charge the surface of the photosensitive drum 11 to a predetermined potential. The optical scanning device 13 exposes the surface of the photosensitive drum 11 to form an electrostatic latent image. The developing device 14 develops the electrostatic latent image on the surface of the photosensitive drum 11 to form a toner image on the surface of the photosensitive drum 11.

  The transfer device 15 includes a transfer roller 15a. The transfer roller 15a forms a transfer nip area with the photosensitive drum 11, and the recording sheet P conveyed by the sheet conveying unit 102 is sandwiched and conveyed in the transfer nip area. The toner image on the surface of the photosensitive drum 11 is transferred to the recording sheet P when passing through the transfer nip region. The drum cleaning device 16 removes and collects residual toner on the surface of the photosensitive drum 11. The fixing device 17 includes a heating roller 17a and a pressure roller 17b. A fixing nip region is formed between the heating roller 17a and the pressure roller 17b, and the recording sheet P onto which the toner image is transferred is sandwiched between the fixing nip region. The toner image is fixed on the recording sheet P by heating and pressing.

  The sheet conveyance unit 102 includes a sheet supply unit 31, supply rollers 32 to 32, conveyance rollers 33 to 33, a registration roller 34, a sheet conveyance path R <b> 1, a discharge roller 35, and a sheet discharge unit 36.

  The sheet supply unit 31 includes sheet feed trays 31a and 31a and a manual sheet feed tray 31b, and a recording sheet P stacked on the sheet feed trays 31a and 31a or the manual sheet feed tray 31b is fed by sheet feeding rollers 32 to 32. It is drawn toward R1.

  In the sheet conveyance path R1, a registration roller 34, conveyance rollers 33 to 33, the photosensitive drum 11, a transfer roller 15a, a heating roller 17a, a pressure roller 17b, and a discharge roller 35 are disposed.

  The sheet discharge unit 36 includes a discharge tray 36a, and the recording sheet P discharged to the outside by the discharge roller 35 is placed on the discharge tray 36a.

  In the printing apparatus 10 described above, the recording sheets P stacked on the paper feed tray 31a or the manual paper feed tray 31b are pulled out from the paper feed tray 31a or the manual paper feed tray 31b toward the sheet conveyance path R1 by the supply roller 32. Then, the toner image is conveyed through the sheet conveyance path R1, passes through the conveyance roller 33 and the registration roller 34, and the toner image is transferred in the transfer nip region between the photosensitive drum 11 and the transfer roller 15a, and the heating roller 17a and the pressure roller 17b. The toner image is fixed in the fixing nip area between the two, and is discharged to the outside by the discharge roller 35 and placed on the discharge tray 36a.

  The sheet conveyance path R1 includes a reversing path R1a that guides the recording sheet P conveyed in the reverse direction by the discharge roller 35 to the upstream side of the registration roller 34 so that the front and back are reversed. When the printing apparatus 10 forms an image not only on the front surface but also on the back surface of the recording sheet P, the recording sheet P is conveyed in the reverse direction from the discharge roller 35 to the reversing path R1a, so that the front and back of the recording sheet are reversed. The toner image is guided again to the registration roller 34, and a toner image is formed and fixed on the back surface of the recording sheet P in the same manner as the front surface of the recording sheet P, and then discharged to the discharge tray 36a.

[Image reading device]
The image reading apparatus 2 includes a scanning body 211 provided with a light source 211 a and a document table 212 on which the document G is placed. The scanning body 211 is stopped at a predetermined reading position and is transported by the document transport unit 22. An image of the original G is imaged by reading the original G with the image sensor 216 or scanning the original G placed on the original table 212 while moving the scanning body 211 to one side in the width direction Y (sub-scanning direction). Reading is performed by the sensor 216.

  Specifically, the image reading apparatus 2 includes a scanning unit 21 disposed in the upper part of the printing apparatus 10 in the vertical direction Z, and a document conveying unit 22 disposed on the upper surface of the scanning unit 21. 21 includes a scanning body 211 and a document table 212.

  The document conveyance unit 22 is rotatable about a pivot shaft along the width direction Y on the back side (the side opposite to the operation side) which is one side in the depth direction X (main scanning direction) with respect to the scanning unit 21. The document table 212 in the scanning unit 21 is opened by being opened from the front side (operation side).

  The document table 212 includes a transparent flat plate-like document reading plate (specifically, a document reading glass 213), a transparent flat plate-like document placing plate (specifically, a document placing glass 214), and a housing 215. ing.

  The scanning body 211 is provided below the document reading glass 213 and the document placement glass 214 so as to be reciprocally movable along the width direction Y with respect to the housing 215, and is driven by a drive unit (not shown). It has become.

  Then, the image reading apparatus 2 stops the scanning body 211 at a position below the document reading glass 213, and moves and reads the document G that is transported by the document transport unit 22 and passes over the document reading glass 213. Operation and original fixed reading for reading the image of the original G placed on the original placement glass 214 while moving the scanning body 211 in the width direction Y (sub-scanning direction) along the lower surface of the original placement glass 214 It is set as the structure which performs operation | movement. In this example, the image reading apparatus 2 further includes a contact image sensor 226, and reads an image on the other side of the original G in the original movement reading operation.

  Specifically, the document transport unit 22 is pulled out by the document tray 221 on which the document G is placed, the supply roller 222 that pulls out the document G placed on the document tray 221 one by one, and the supply roller 222. A sheet conveyance path R2 (original conveyance path) for guiding the document G to the discharge side (below the document tray 221) through the document reading glass 213, a conveyance roller 223 provided on the sheet conveyance path R2, a registration roller 224, and conveyance Rollers 225 and 225, a contact image sensor 226 and a discharge roller 227, and a document discharge tray 228 on which the document G discharged to the outside is placed.

  The conveyance roller 223 conveys the document G drawn by the supply roller 222 to the registration roller 224. The registration roller 224 conveys the document G conveyed by the conveyance roller 223 onto the document reading glass 213. The transport rollers 225 and 225 transport the document G transported from the document reading glass 213 to the contact image sensor 226. The discharge roller 227 discharges the document G conveyed from the contact image sensor 226 to the outside.

  In the document transport unit 22 having such a configuration, the document G placed on the document tray 221 is pulled out by the supply roller 222 and supplied to the sheet transport path R2, and is transported toward the registration roller 224 by the transport roller 223. The leading edges are aligned by the registration rollers 224, and the image surface is conveyed so as to be in close contact with the upper surface of the document reading glass 213 at a predetermined reading timing. At this time, the scanning body 211 stopped at a position below the document reading glass 213 reads an image of the document G conveyed along the upper surface of the document reading glass 213. Thereafter, the original G that has passed through the original reading glass 213 is conveyed to the discharge roller 227 via the conveying rollers 225 and 225. At this time, when reading an image on the other side of the original G, the contact image sensor 226 reads an image on the other side of the original G. Thereafter, the document G that has passed through the contact image sensor 226 is discharged to the document discharge tray 228 by the discharge roller 227, and the document G discharged to the outside is placed on the document discharge tray 228.

(About motor drive circuit)
The conveyance rollers (specifically, conveyance rollers 33 to 33) that convey the recording sheet P in the printing apparatus 10 and the conveyance rollers (specifically, conveyance rollers 225 and 225) that convey the document G in the image reading apparatus 2 are provided. These are rotated by motors M1 and M2 (see FIG. 3 described later), respectively.

  FIG. 3 illustrates an example of a basic motor circuit 50a that rotates the motor M1 in the printing apparatus 10 included in the image forming apparatus 1 and the motor M2 that rotates in the image reading apparatus 2 included in the image forming apparatus 1. It is a circuit diagram which shows an example of the motor circuit 50b of basic composition.

  The printing apparatus 10 further includes a motor drive circuit 51, a power supply circuit 61, and a motor M1, and the motor drive circuit 51, the power supply circuit 61, and the motor M1 constitute a motor circuit 50a. The image reading apparatus 2 further includes a motor drive circuit 52, a power supply circuit 62, and a motor M2. The motor drive circuit 52, the power supply circuit 62, and the motor M2 constitute a motor circuit 50b. The power supply circuit 61, the motor drive circuit 51, the motor M1, and the like in the printing apparatus 10 and the power supply circuit 62, the motor drive circuit 52, the motor M2, and the like in the image reading apparatus 2 have substantially the same configuration. In FIG. 3, the power supply circuit 61, the motor drive circuit 51, the motor M1, and the like in the printing apparatus 10 and the power supply circuit 62, the motor drive circuit 52, the motor M2, and the like in the image reading apparatus 2 are shown in one view.

  The motor M <b> 1 rotates the conveyance rollers (specifically, the conveyance rollers 33 to 33) that convey the recording sheet P via the drive transmission mechanism 37 such as a gear or a chain in the printing apparatus 10. The motor drive circuit 51 supplies electric power to the motor M1 to drive the motor M1. In the printing apparatus 10, a transport roller (specifically, the transport rollers 33 to 33) that transports the recording sheet P is a rotation axis Ma of a motor M <b> 1 that is driven by a motor drive circuit 51 via a drive transmission mechanism 37. And is driven to rotate by a motor M1 via a drive transmission mechanism 37.

  The motor M2 rotates the conveyance rollers (specifically, the conveyance rollers 225 and 225) that convey the document G via the drive transmission mechanism 38 such as a gear or a chain in the image reading apparatus 2. The motor drive circuit 52 supplies electric power to the motor M2 to drive the motor M2. In the image reading apparatus 2, the transport rollers (specifically, the transport rollers 225 and 225) that transport the document G are rotated by the motor drive circuit 52 via the drive transmission mechanism 38. And is rotated by a motor M2 via a drive transmission mechanism 38.

  Specifically, the motor drive circuits 51 and 52 are supplied with power from the power supply circuits 61 and 62. The motor drive circuits 51 and 52 include a plurality (four in this example) of semiconductor switches SW1 to SW4 and control units 51a and 52a that perform switching control of the semiconductor switches SW1 to SW4. The semiconductor switches SW1 to SW4 constitute an H bridge circuit, and motors M1 and M2 (DC motors in this example) are connected between upper and lower arms in the H bridge circuit via connection circuits 53 and 54. The semiconductor switches SW1 and SW2 are composed of a switching element S1 and a diode D. The semiconductor switches SW3 and SW4 are composed of a switching element S2 and a diode D. The switching elements S1 and S2 are semiconductor devices that can be turned on and off by the control units 51a and 52a. The diode D is connected in parallel to the switching elements S1 and S2.

  Specifically, the connection circuits 53 and 54 include a plurality (two in this example) of connection wires L1 and L2 (harness), and one end of each of the connection wires L1 and L2 is connected to each leg LG1 in the H bridge circuit. LG2 are connected between the upper and lower arms of LG2, and the other ends of the connection wires L1 and L2 are connected to power supply terminals T1 and T2 of the motors M1 and M2. In this example, the switching element S1 in the semiconductor switches SW1 and SW2 of the upper arm UP of the H bridge circuit is a silicon P-channel MOS field effect transistor, and in the semiconductor switches SW3 and SW4 of the lower arm DW of the H bridge circuit. In this example, the switching element S2 is a silicon N-channel MOS field effect transistor.

  In the motor circuits 50a and 50b described above, when the motors M1 and M2 are rotationally driven, the power is supplied from the power supply circuits 61 and 62, that is, the output voltage Vdd of the power supply circuits 61 and 62 is the motor drive circuit 51. , 52 of the motors M1, M2 by controlling the switching elements S1, S2 on / off by the control units 51a, 52a in a state where the power supply voltage Vcc (24V in this example) is maintained substantially constant. To drive the motors M1 and M2 in rotation.

  The motor circuits 50a and 50b are not limited to the circuit configuration shown in FIG. 3, and various conventionally known circuit configurations can be used.

(About generation of counter electromotive force by motor)
By the way, in the printing apparatus 10 and the image reading apparatus 2, when the cover members 410 and 420 and the cover member 430 (see FIGS. 4, 5, and 6), which will be described later, are in the open state, the motor M1 and the motor M2 are rotated by external force. When this occurs, a counter electromotive force is generated.

  Specifically, the recording sheet P or the original G may be clogged in the printing apparatus 10 or the image reading apparatus 2.

  FIG. 4 is an explanatory diagram for explaining a process of releasing the jammed state of the recording sheet P when the jamming of the recording sheet P occurs in the printing apparatus 101 while the recording unit P forms an image. It is a figure, Comprising: It is a perspective view which shows the state in which the cover member 410 is open | released. FIG. 5 is an explanatory diagram for explaining the release process of the jammed state of the recording sheet P when the jamming of the recording sheet P occurs while the recording sheet P is being pulled out by the sheet supply unit 31 in the printing apparatus 10. And it is a front view which shows the state in which the cover member 420 is open | released roughly. FIG. 6 is an explanatory diagram for explaining a process of clearing the jammed state of the document G when the document G is jammed while the document G is being read by the scanning unit 21 in the image reading apparatus 2. FIG. 5 is a front view schematically showing a state in which a cover member 430 is opened.

  As shown in FIGS. 4 and 5, the printing apparatus 10 has an open state in which the inside of the main body 10 a of the printing apparatus 10 (specifically, a part of the main body 10 a) is exposed and the inside of the printing apparatus 10 (specifically Are provided with cover members 410 and 420 that can be closed to cover the exposed interior of the main body 10a.

  Further, as shown in FIG. 6, the image reading apparatus 2 has an open state in which the inside of the main body 2 a of the image reading apparatus 2 (specifically, part of the main body 2 a) is exposed, and the main body 2 a of the image reading apparatus 2. Cover member 430 that can be in a closed state that covers the inside (specifically, the exposed inside of the main body 2a).

  In the present embodiment, in the printing apparatus 10, the conveyance rollers 33 to 33 that convey the recording sheet P and the motor M <b> 1 are configured to work together, and the cover members 410 and 420 are moved from the conveyance rollers 33 to 33 to the recording sheet. When P is removed, an open state is assumed. For example, the open state of the cover members 410 and 420 is a state where the printing apparatus 10 is opened to such an extent that the jammed recording sheet P can be removed.

  Further, in the image reading apparatus 2, the conveyance rollers 225 and 225 that convey the document G and the motor M <b> 2 are configured to operate together, and the cover member 430 is configured to remove the document G from the conveyance rollers 225 and 225. It is set as the structure which takes an open state. For example, the open state of the cover member 430 is a state in which the jammed original G can be removed in the image reading apparatus 2.

  Specifically, as shown in FIG. 4, the cover member 410 is provided at the clogging position of the recording sheet P that stops on the sheet conveyance path R <b> 1 when the recording sheet P is clogged in the printing apparatus 10. In this case, the jammed position of the recording sheet P is a position where a part of the sheet conveyance path R1 between the sheet supply unit 31 and the sheet discharge unit 36 is exposed in the open state.

  Specifically, the cover member 410 supports the cover main body 411 constituting the main body of the cover member 410 and the cover main body 411, while the pair of slide members 412 and 412 supported by the main body 10 a of the printing apparatus 10. (Only one side is shown in FIG. 4). The pair of slide members 412 and 412 is configured to be extendable in the width direction Y, one slide member 412 is provided on one side (front side) in the depth direction X, and the other slide member 412 is provided. It is provided on the other side (the heel side) in the depth direction X. One end of each of the pair of slide members 412 and 412 is fixed to the main body 10 a of the printing apparatus 10, and the other end is fixed to the cover main body 411. Thereby, the cover member 410 takes a closed state by moving to the one side in the width direction Y (the side closer to the main body 10a of the printing apparatus 10) with respect to the main body 10a of the printing apparatus 10, and the width direction Y The other side (the side away from the main body 10a of the printing apparatus 10) can be opened. In the present embodiment, the cover member 410 is provided with a release lever 415 that locks the cover body 411 so that the cover main body 411 can be released when the cover member 410 is closed.

  Further, as shown in FIG. 5, the cover member 420 is provided at the clogging position of the recording sheet P that stops on the sheet conveyance path R <b> 1 when the recording sheet P is clogged in the printing apparatus 10. The jammed position of the recording sheet P is a position where a part of the sheet transport path R1 is exposed in the sheet supply unit 31 when the recording sheet P is in the open state.

  Specifically, the cover member 420 is supported by the main body 10a of the printing apparatus 10 so as to be rotatable about an axis along the depth direction X. The cover member 420 includes a cover main body 421 constituting the main body of the cover member 420 and a pair of rotating shafts 422 and 422 (only one side is shown in FIG. 5) along the depth direction X. In the pair of rotation shafts 422 and 422, one rotation shaft 422 is provided on one side (front side) in the depth direction X of the main body 10 a of the printing apparatus 10, and the other rotation shaft 422 is the printing apparatus 10. The main body 10a is provided on the other side (the heel side) in the depth direction X. In the pair of rotation shafts 422 and 422, one rotation shaft 422 supports one side (front side) of the cover body 421 in the depth direction X so as to be rotatable, and the other rotation shaft 422 covers the cover. The other side (the heel side) in the depth direction X of the main body 421 is rotatably supported. As a result, the cover member 420 takes a closed state by rotating to one side (counterclockwise in the example shown in FIG. 5) around the rotation shaft 422 with respect to the main body 10a of the printing apparatus 10. An open state can be obtained by rotating to the other side around the rotation shaft 422 (clockwise in the example shown in FIG. 5). In the present embodiment, the cover member 420 is provided with a release lever 425 that releasably locks the cover main body 421 when the cover member 420 is in the closed state.

  Further, as shown in FIG. 6, the cover member 430 is provided at the jam position of the document G that stops on the sheet conveyance path R <b> 2 when the document G is jammed in the image reading apparatus 2. The jammed position of the document G is a position where a part of the sheet conveyance path R2 between the document tray 221 and the document discharge tray 228 is exposed when the document G is in the open state.

  Specifically, the cover member 430 is supported by the main body 2a of the image reading apparatus 2 so as to be rotatable about an axis along the depth direction X. The cover member 430 includes a cover main body portion 431 constituting the main body of the cover member 430 and a pair of rotating shafts 432 and 432 (only one side is shown in FIG. 6) along the depth direction X. Of the pair of rotation shafts 432 and 432, one rotation shaft 432 is provided on one side (front side) in the depth direction X of the main body 2 a of the image reading apparatus 2, and the other rotation shaft 432 is image reading. The main body 2a of the device 2 is provided on the other side (the heel side) in the depth direction X. In the pair of rotation shafts 432 and 432, one rotation shaft 432 rotatably supports one side (front side) in the depth direction X of the cover main body 431, and the other rotation shaft 432 covers the cover. The other side (the heel side) in the depth direction X of the main body portion 431 is rotatably supported. As a result, the cover member 430 is closed by rotating to the one side around the rotation shaft 432 (clockwise in the example shown in FIG. 6) with respect to the main body 2a of the image reading apparatus 2, and An open state can be obtained by rotating to the other side around the rotation shaft 432 (counterclockwise in the example shown in FIG. 6). In the present embodiment, the cover member 430 is provided with a release lever 435 that releasably locks the cover main body 431 when the cover member 430 is closed.

  When the recording sheet P is clogged between the sheet supply unit 31 and the sheet discharge unit 36 in the printing apparatus 10 (see FIG. 4), the user locks the cover member 410 in the closed state by the release lever 415. Is released, the cover member 410 is opened, the jammed recording sheet P is pulled out, the recording sheet P is removed, the cover member 410 is returned to the closed state, and the jammed state of the recording sheet P is released. 10, when the recording sheet P is jammed (see FIG. 5), the cover member 420 is unlocked by the release lever 425, the cover member 420 is opened, and jammed. After the recording sheet P is pulled out and the recording sheet P is removed, the cover member 420 is returned to the closed state to release the jammed state of the recording sheet P. Further, when the document G is clogged between the document tray 221 and the document discharge tray 228 in the image reading apparatus 2 (see FIG. 6), the user locks the cover member 430 in the closed state by the release lever 435. Then, the cover member 430 is opened, the jammed original G is pulled out, the original G is removed, the cover member 430 is returned to the closed state, and the jammed state of the original G is released.

  As described above, when the recording sheet P or the original G is jammed and the jammed recording sheet P or the original G is pulled out, the recording sheet P or the original G is moved when the recording sheet P or the original G is pulled out. Along with this, a conveyance roller holding the recording sheet P and the original G (specifically, the conveyance roller 33 in the printing apparatus 10 and the conveyance roller 225 in the image reading apparatus 2) is rotated, and as a result, a motor that interlocks with the conveyance roller. M1 and M2 (see FIG. 3) are forcibly rotated, thereby generating back electromotive force in the motors M1 and M2.

  FIG. 7 is a circuit diagram showing a state where the back electromotive force E is generated in the motors M1 and M2 in the motor circuits 50a and 50b having the basic configuration shown in FIG. In FIG. 7, the control units 51a and 52a shown in FIG. 3 are not shown.

  As shown in FIG. 7, when the back electromotive force E is generated in the motors M1 and M2, the current Ie accompanying the generation of the back electromotive force E is supplied from the motors M1 and M2 to the motor drive circuits 51 and 52 via the connection circuits 53 and 54. Go around. At this time, when the circuit system connected to the motor drive circuits 51 and 52 (for example, the power supply circuits 61 and 62 for supplying power to the motor drive circuits 51 and 52 or the other load Lo is connected to the power supply circuits 61 and 62) In other loads Lo), when the back electromotive force E wrapping around the motor drive circuits 51 and 52 cannot be absorbed, the back electromotive force E raises the power supply voltage Vcc of the motor drive circuits 51 and 52. . As a result, the motor drive circuits 51 and 52 and the circuit system connected to the motor drive circuits 51 and 52 (for example, power supply circuits 61 and 62 for supplying power to the motor drive circuits 51 and 52 and other loads on the power supply circuits 61 and 62) If Lo is connected, other loads Lo) may fail.

  This is because when the load Lo connected to the power supply circuits 61 and 62 is small, or when the connection wiring L3 connected from the power supply circuits 61 and 62 to the motor drive circuits 51 and 52 is blocked by the interlock mechanism IL, This is particularly noticeable because the number of components of the circuit system that absorbs the back electromotive force E that wraps around the motor drive circuits 51 and 52 decreases.

  FIG. 8 is clogged when the connection wiring L3 connecting the power supply circuits 61 and 62 and the motor drive circuits 51 and 52 is blocked by the interlock mechanism IL in the motor circuits 50a and 50b having the basic configuration shown in FIG. The output voltage Vdd of the power supply circuits 61 and 62, the power supply voltage Vcc of the motor drive circuits 51 and 52, and the motors M1 and M2 when the recording sheet P and the original G are pulled out and the back electromotive force E is generated in the motors M1 and M2. It is a waveform which shows the voltage Vm between terminals of electric power feeding terminal T1, T2. 8A shows the output voltage Vdd of the power supply circuits 61 and 62, FIG. 8B shows the power supply voltage Vcc of the motor drive circuits 51 and 52, and FIG. 8C. Indicates the voltage Vm between the power supply terminals T1 and T2 of the motors M1 and M2. In FIG. 8, the thick waveform indicates the voltage fluctuation range.

As shown in FIG. 8A, the output voltage Vdd of the power supply circuits 61 and 62 is cut off by the interlock mechanism IL in the connection wiring L3 that connects the power supply circuits 61 and 62 and the motor drive circuits 51 and 52. Therefore, even if the recording sheet P or the original G is pulled out and the back electromotive force E is generated in the motors M1 and M2, it is maintained at a substantially constant voltage value (about 24 V in this example). In this state, since the connection wiring L3 is interrupted by the interlock mechanism IL, the number of components of the circuit system that absorbs the counter electromotive force E that has entered the motor drive circuits 51 and 52 is reduced. As shown in FIG. 8C, when the back electromotive force E (maximum value 29.2 V in this example) is generated in the motors M1 and M2, the power supply voltages of the motor drive circuits 51 and 52 are shown in FIG. Vcc is lifted (in this example, the maximum value is 28V) and exceeds the rating (withstand voltage) (for example, rated voltage 24V) of the motor drive circuits 51 and 52 and the circuit system connected to the motor drive circuits 51 and 52, thereby driving the motor. There is a possibility that a circuit system connected to the circuits 51 and 52 and the motor drive circuits 51 and 52 (for example, another load Lo connected to the power supply circuits 61 and 62) may break down.

[About the first to sixth embodiments]
From such a viewpoint, in the printing apparatus 10 according to the first embodiment, the second embodiment, the fourth embodiment, and the fifth embodiment, the connection circuit 53 that connects the motor M1 and the motor drive circuit 51 includes the cover member 410, When 420 is open, the connection between the motor M1 and the motor drive circuit 51 is cut off, and when the cover members 410 and 420 are closed, the motor M1 and the motor drive circuit 51 are connected. .

  In the image reading apparatus 2 according to the third and sixth embodiments, the connection circuit 54 that connects the motor M2 and the motor drive circuit 52 is connected to the motor M2 and the motor drive when the cover member 430 is opened. When the connection with the circuit 52 is interrupted and the cover member 430 is closed, the motor M2 and the motor drive circuit 52 are connected.

(First to third embodiments)
9 illustrates an example of a wiring connection state of the motor circuit 50c in the printing apparatus 10 according to the first and second embodiments, and an example of a wiring connection state of the motor circuit 50d in the image reading apparatus 2 according to the second embodiment. FIG. The power supply circuit 61, the motor drive circuit 51, the motor M1, and the cover members 410, 420 in the printing apparatus 10 and the power supply circuit 62, the motor drive circuit 52, the motor M2, the cover member 430, etc. in the image reading apparatus 2 are as follows. 9, the power supply circuit 61, the motor drive circuit 51, the motor M1, the cover members 410, 420, and the like in the printing apparatus 10, the power supply circuit 62, and the motor drive circuit in the image reading apparatus 2 are the same. 52, the motor M2, the cover member 430, and the like are shown in one figure. Further, in FIG. 9, the control units 51a, 52a and the like shown in FIG. 3 are not shown.

  As shown in FIG. 9, in the printing apparatus 10 according to the first and second embodiments, the connection circuit 53 that connects the motor M <b> 1 and the motor drive circuit 51 is interlocked with the opening and closing of the cover members 410 and 420. Switches 413 and 423 that operate, and connection wirings L1 and L2 that connect the motor M1 and the motor drive circuit 51 via the switches 413 and 423 are provided. In the printing apparatus 10 according to the first embodiment and the second embodiment, the main body 10a of the printing apparatus 10 is provided with a power supply circuit 61, a motor drive circuit 51, a motor M1, and switches 413 and 423.

  In the image reading apparatus 2 according to the third embodiment, the connection circuit 54 that connects the motor M2 and the motor drive circuit 52 includes the switch 433 that operates in conjunction with opening and closing of the cover member 430, and the switch 433. Connection wirings L1 and L2 for connecting the motor M2 and the motor drive circuit 52 are provided. In the image reading apparatus 2 according to the third embodiment, the main body 2a of the image reading apparatus 2 is provided with a power supply circuit 62, a motor drive circuit 52, a motor M2, and a switch 433.

  10 and 11 are front views schematically showing an example of an arrangement state of the switches 413 and 423 provided in the printing apparatus 10 according to the first embodiment and the second embodiment, respectively. FIG. 12 is a front view schematically showing an example of an arrangement state of the switches 433 provided in the image reading apparatus 2 according to the third embodiment. In FIG. 10, the slide member 412 is not shown.

  As shown in FIGS. 10 to 12, the switches (413, 423) and 433 have a movable part 400 a that switches between an on state and an off state, and the off state is set when no external force is applied to the movable part 400 a. On the other hand, when an external force is applied to the movable part 400a, the state is turned on, and when the external force to the movable part 400a is released, the state is returned to the off state. In this example, the switches (413, 423) and 433 are micro switches including an actuator that acts as the movable portion 400a.

  As shown in FIGS. 10 and 11, the switches 413 and 423 are provided on the main body 10 a of the printing apparatus 10 so that the movable portion 400 a faces the cover members 410 and 420. Specifically, the switches 413 and 423 are provided in a casing in which either one of the outer sides in the depth direction X of the sheet conveyance path R1 (the front side in this example) is omitted in the main body 10a of the printing apparatus 10. It is provided so that at least the movable part 400a is exposed when the cover members 410 and 420 are opened. On the other hand, in the cover members 410 and 420, the switches 413 and 423 are turned on when the cover members 410 and 420 are closed, and the switches 413 and 423 are turned off when the cover members 410 and 420 are open. Switch actuating portions 410a and 420a are provided. Specifically, the switch operating portions 410a and 420a are projections in this example, and when the cover members 410 and 420 are closed, the movable portion 400a is pressed to turn on the switches 413 and 423, In addition, when the cover members 410 and 420 are in the open state, the cover members 410 and 420 are provided so as to release the pressure on the movable portion 400a and to turn off the switches 413 and 423.

  The motor M1 and / or the switches 413 and 423 may be provided on the cover members 410 and 420. When the switches 413 and 423 are provided on the cover members 410 and 420, the switch operating portions 410 a and 420 a are provided on the main body 10 a of the printing apparatus 10.

  As shown in FIG. 12, the switch 433 is provided on the main body 2a of the image reading apparatus 2 so that the movable portion 400a faces the cover member 430 side. Specifically, the switch 433 covers a casing of the main body 2a of the image reading apparatus 2 in which either one of the outer sides in the depth direction X of the sheet conveyance path R2 (the front side in this example) is omitted. It is provided so that at least the movable part 400a is exposed when the member 430 is opened. On the other hand, the cover member 430 is provided with a switch operating portion 430a that turns on the switch 433 when the cover member 430 is closed and turns off the switch 433 when the cover member 430 is open. Yes. Specifically, the switch operating portion 430a is a protrusion in this example, and when the cover member 430 is in the closed state, the movable portion 400a is pressed to turn on the switch 433, and the cover member 430 is The cover member 430 is provided so as to release the pressure on the movable portion 400a and to turn off the switch 433 in the open state.

  The motor drive circuit 52 and / or the switch 433 may be provided on the cover member 430. When the switch 433 is provided on the cover member 430, the switch operation unit 430 a is provided on the main body 2 a of the image reading device 2.

  In the printing apparatus 10 according to the first and second embodiments and the image reading apparatus 2 according to the third embodiment described above, the switches (413, 423), 433 are the cover members (410, 420), 430. When taking the closed state, the motors M1, M2 and the motor drive circuits 51, 52 are connected, and when the cover members (410, 420), 430 are in the open state, the motors M1, M2 and the motor drive circuit 51, The connection with 52 is cut off. Specifically, when the cover member (410, 420), 430 is closed by the user, the switch (410a, 420a), 430a provided on the cover member (410, 420), 430 causes the switch ( 413, 423), and 433 are pressed and turned on. On the other hand, when the cover members (410, 420), 430 are opened by the user, the pressed state of the movable part 400a of the switches (413, 423), 433 is released and the switches (413, 423), 433 are turned off. It becomes a state. Therefore, when the recording sheet P or the original G is jammed, the motors M1 and M2 are forcibly rotated by pulling out the jammed recording sheet P or the original G in a state where the cover members (410, 420) and 430 are opened. Even if the back electromotive force E is generated in the motors M1 and M2, the switches (413, 423) and 433 are in the OFF state at this time, that is, the motors M1 and M2 and the motor drive circuits 51 and 52 Therefore, the back electromotive force E does not flow into the motor drive circuits 51 and 52 side.

(Fourth to sixth embodiments)
Incidentally, as in the first to third embodiments shown in FIGS. 9 to 12, the connection circuits 53 and 54 that connect the motors M <b> 1 and M <b> 2 and the motor drive circuits 51 and 52 are the cover members (410 and 420). ), 430, which operate in conjunction with the opening and closing of 430, and the connection wiring L1 that connects the motors M1, M2 and the motor drive circuits 51, 52 via the switches (413, 423), 433. , L2, it is necessary to provide the switches (413, 423), 433 according to the number of connection wirings L1, L2 that connect the motors M1, M2 and the motor drive circuits 51, 52. Space for providing the switches (413, 423), 433 is required, and the wiring processing of the connection wirings L1, L2 becomes complicated. This becomes particularly conspicuous when the number of motors is increased and when one connection wiring is connected to one switch.

  Therefore, the printing apparatus 10 has the configuration of the following fourth and fifth embodiments, and the image reading apparatus 2 has the configuration of the following sixth embodiment.

  FIG. 13 illustrates an example of a wiring connection state of the motor circuit 50e in the printing apparatus 10 according to the fourth and fifth embodiments, and an example of a wiring connection state of the motor circuit 50f in the image reading apparatus 2 according to the sixth embodiment. FIG. The power supply circuit 61, the motor drive circuit 51, the motors M1 to M1 and the cover members 410 and 420 in the printing apparatus 10 and the power supply circuit 62, the motor drive circuit 52, the motors M2 to M2 and the cover member 430 in the image reading apparatus 2 are used. 13 and the like have substantially the same configuration. In FIG. 13, the power supply circuit 61, the motor drive circuit 51, the motors M1 to M1, the cover members 410 and 420, etc. in the printing apparatus 10 and the power supply in the image reading apparatus 2 are used. The circuit 62, the motor drive circuit 52, the motors M2 to M2, the cover member 430, and the like are shown in one drawing. In the circuit configuration shown in FIG. 13, the same reference numerals are given to substantially the same components as those in the circuit configuration shown in FIG. 9, and the description thereof is omitted. In FIG. 13, the control units 51a, 52a and the like shown in FIG. 3 are not shown.

  As illustrated in FIG. 13, in the printing apparatus 10 according to the fourth and fifth embodiments, the connection circuit 53 that connects the motors M <b> 1 to M <b> 1 and the motor driving circuit 51 is provided with the main body 10 a and the cover member of the printing apparatus 10. 410 and 420 are connected to each other when the cover members 410 and 420 are in a closed state, and are connected to each other when the cover members 410 and 420 are in an open state. And connection wirings L1 (L11, L12, L13) and L2 (L21, L22, L23) for connecting the motors M1 to M1 and the motor drive circuit 51 via the drawer connectors 414, 424. In the printing apparatus 10 according to the fourth and fifth embodiments, the main body 10a of the printing apparatus 10 includes a power supply circuit 61, a single motor driving circuit 51, and a plurality (three in this example) of motors M1 to M1. The connection circuit 53 connects a plurality of motors M1 to M1 and a single motor drive circuit 51 via a single drawer connector 414, 424.

  The drawer connectors 414 and 424 include main body side connectors 414 a and 424 a provided on the main body 10 a of the printing apparatus 10 and cover member side connectors 414 b and 424 b provided on the cover members 410 and 420. The main body side connectors 414a and 424a are respectively connected to the motor drive circuit 51 and the motors M1 to M1 via connection wiring (harness). The cover member side connectors 414b and 424b are wired so as to connect the motors M1 to M1 and the motor drive circuit 51 via connection wiring (harness) when connected to the main body side connectors 414a and 424a.

  Specifically, the connection wires L1 (L11, L12, L13) and L2 (L21, L22, L23) are connected between the motors M1 to M1 in the main body 10a of the printing apparatus 10 and the motor connection terminals Ta in the main body side connectors 414a and 424a. A first connection portion La that connects between the motor drive circuit 51 in the main body 10a of the printing apparatus 10 and a second connection portion Lb that connects between the motor drive circuit connection terminals Tb in the main body side connectors 414a and 424a, In the cover members 410 and 420, the motor connection terminal Tc in the cover member side connectors 414b and 424b corresponding to the motor connection terminal Ta in the main body side connectors 414a and 424a and the motor drive circuit connection terminal Tb in the main body side connectors 414a and 424a. Corresponding cover member side connector 4 4b, it is composed of a third connecting portion Lc that connects the terminal Td motor drive circuit connections in 424b.

  Similarly, in the image reading apparatus 2 according to the sixth embodiment, the connection circuit 54 that connects the motors M <b> 2 to M <b> 2 and the motor driving circuit 52 is provided on both the main body 2 a and the cover member 430 of the image reading apparatus 2. A drawer connector 434 provided to be connected to each other when the cover member 430 is in a closed state, and to be disconnected when the cover member 430 is in an open state, and the motors M2 to M2 via the drawer connector 434 Connection wires L1 (L11, L12, L13) and L2 (L21, L22, L23) for connecting the motor drive circuit 52 are provided. In the image reading apparatus 2 according to the sixth embodiment, the main body 2a of the image reading apparatus 2 is provided with a power supply circuit 62, a single motor drive circuit 52, and a plurality (three in this example) of motors M2 to M2. The connection circuit 54 connects the plurality of motors M <b> 2 to M <b> 2 and the single motor drive circuit 52 via a single drawer connector 434.

  The drawer connector 434 includes a main body side connector 434 a provided on the main body 2 a of the image reading apparatus 2 and a cover member side connector 434 b provided on the cover member 430. The main body side connector 434a is connected to the motor drive circuit 52 and the motors M2 to M2 via connection wiring (harness). The cover member side connector 434b is wired so as to connect the motors M2 to M2 and the motor drive circuit 52 via connection wiring (harness) when connected to the main body side connector 434a.

  Specifically, the connection wires L1 (L11, L12, L13) and L2 (L21, L22, L23) are between the motors M2 to M2 in the main body 2a of the image reading apparatus 2 and the motor connection terminal Ta in the main body side connector 434a. A first connection portion La that connects the motor drive circuit 52 and the motor drive circuit connection terminal Tb of the main body side connector 434a in the main body 2a of the image reading apparatus 2, and a cover member In 430, the motor drive in the cover member side connector 434b corresponding to the motor connection terminal Tc in the cover member side connector 434b corresponding to the motor connection terminal Ta in the main body side connector 434a and the motor drive circuit connection terminal Tb in the main body side connector 434a. Connect to circuit connection terminal Td It is composed of a third connecting portion Lc.

  FIG. 14 is a perspective view illustrating an example of drawer connectors (414, 424) and 434 used in the printing apparatus 10 and the image reading apparatus 2.

  As shown in FIG. 14, in the drawer connectors (414, 424), 434, the main body side connectors (414a, 424a), 434a are female connectors, and the cover member side connectors (414b, 424b), 434b are male connectors. It is said that. The main body side connectors (414a, 424a) and 434a may be male connectors, and the cover member side connectors (414b, 424b) and 434b may be female connectors.

  The drawer connectors (414, 424), 434 are one or a plurality (two in this example) for guiding the connection between the main body side connectors (414a, 424a), 434a and the cover member side connectors (414b, 424b), 434b. ) Engaging projections K, K and locking holes H, H. The engagement protrusions K, K extend in the insertion direction of the main body side connectors (414a, 424a), 434a and the cover member side connectors (414b, 424b), 434b, and the cover member side connectors (414b, 424b), 434b. Is provided. The locking holes H, H extend along the engaging protrusions K, K, and are provided in the main body side connectors (414a, 424a), 434a. The engagement protrusions K, K may be provided in the main body side connectors (414a, 424a), 434a, and the locking holes H, H may be provided in the cover member side connectors (414b, 424b), 434b.

  15 and 16 are front views schematically showing an example of the arrangement state of the drawer connectors 414 and 424 provided in the printing apparatus 10 according to the fourth embodiment and the fifth embodiment, respectively. FIG. 17 is a front view schematically showing an example of an arrangement state of the drawer connector 434 provided in the image reading apparatus 2 according to the sixth embodiment. In FIG. 15, the slide member 412 is not shown.

  As shown in FIGS. 15 and 16, the body side connectors 414 a and 424 a of the drawer connectors 414 and 424 are provided on the body 10 a of the printing apparatus 10 so that the connection side 400 b faces the cover members 410 and 420. Specifically, the main body side connectors 414a and 424a are casings in which either one of the outer sides in the depth direction X of the sheet conveying path R1 (the front side in this example) is omitted in the main body 10a of the printing apparatus 10. The cover members 410 and 420 are provided so that at least the connection side 400b is exposed in the opened state. On the other hand, the cover member side connectors 414b and 424b in the drawer connectors 414 and 424 are connected to the main body side connectors 414a and 424a when the cover members 410 and 420 are closed, and the cover members 410 and 420 are open. Sometimes, the cover members 410 and 420 are provided so as to be separated from the main body side connectors 414a and 424a to be disconnected from the main body side connectors 414a and 424a. Specifically, the cover member-side connectors 414b and 424b are not shown on either one of the outer sides in the depth direction X (the front side in this example) in the sheet conveyance path R1 of the main body 10a of the printing apparatus 10. The body is provided such that at least the connection side 400c is exposed when the cover members 410 and 420 are open.

  Motors M1 to M1 may be provided on cover members 410 and 420. In this case, the motors M1 to M1 and the motor drive circuit 51 are connected via the drawer connectors 414 and 412.

  As shown in FIG. 17, the main body side connector 434a of the drawer connector 434 is provided on the main body 2a of the image reading apparatus 2 so that the connection side 400b faces the cover member 430 side. Specifically, the main body side connector 434a is a housing in which either one of the outer sides in the depth direction X of the sheet conveyance path R2 (the front side in this example) is omitted in the main body 2a of the image reading apparatus 2. In the opened state of the cover member 430, at least the connection side 400b is exposed. On the other hand, the cover member side connector 434b of the drawer connector 434 is connected to the main body side connector 434a when the cover member 430 is closed, and is separated from the main body side connector 434a when the cover member 430 is open. The cover member 430 is provided so as to be disconnected from the main body connector 434a. Specifically, the cover-member-side connector 434b is a housing whose illustration is omitted on either one of the outer sides in the depth direction X in the sheet conveyance path R2 of the main body 2a of the image reading apparatus 2 (the front side in this example). In addition, the cover member 430 is provided so that at least the connection side 400c is exposed in the opened state.

  Motors M2 to M2 may be provided on cover member 430. In this case, the motors M2 to M2 and the motor drive circuit 52 are connected via the drawer connector 434.

  In the printing apparatus 10 according to the fourth and fifth embodiments described above and the image reading apparatus 2 according to the sixth embodiment, the drawer connectors (414, 424), 434 are the cover members (410, 420), When the motor 430 is closed, the motors M1 to M1 and M2 to M2 are connected to the motor driving circuits 51 and 52, and when the cover members (410, 420) and 430 are opened, the motors M1 to M1 are connected. , M2 to M2 and the motor drive circuits 51 and 52 are disconnected. Specifically, when the cover members (410, 420), 430 are closed by the user, the cover member side connectors (414b, 424b), 434b provided on the cover members (410, 420), 430 are the main body 10a. , 2a are inserted into the main body side connectors (414a, 424a), 434a, and the main body side connectors (414a, 424a), 434a and the cover member side connectors (414b, 424b), 434b are connected. On the other hand, when the cover members (410, 420), 430 are opened by the user, the connection state between the cover member side connectors (414b, 424b), 434b and the main body side connectors (414a, 424a), 434a is released. Thus, the main body side connectors (414a, 424a), 434a and the cover member side connectors (414b, 424b), 434b are disconnected. Therefore, when the recording sheet P or the original G is jammed, the motors M1 and M2 are forcibly rotated by pulling out the jammed recording sheet P or the original G in a state where the cover members (410, 420) and 430 are opened. Even if the back electromotive force E is generated in the motors M1 and M2, the main body side connectors (414a and 424a) and 434a and the cover member side connectors (414b and 424b) and 434b are not connected at this time. That is, since the connection wiring between the motors M1 to M1 and M2 to M2 and the motor drive circuits 51 and 52 is not connected, the back electromotive force E flows into the motor drive circuits 51 and 52 side. There is no.

(About this embodiment)
As described above, according to the first to sixth embodiments, the connection circuits 53 and 54 that connect the motors M1 and M2 and the motor drive circuits 51 and 52 are the cover members (410 and 420) and 430, respectively. When the cover member (410, 420), 430 is closed, the motors M1, M2 and the motor drive circuit 51 are disconnected. 52 when the cover members (410, 420), 430 are open, the connection between the motor drive circuits 51, 52 and the motors M1, M2 is forcibly cut off. Therefore, when the cover members (410, 420), 430 are in the open state, even if the motors M1, M2 are rotated by an external force, the motor M1, 2, the current Ie associated with the generation of the back electromotive force E can be prevented from flowing into the motor drive circuits 51 and 52, whereby the motor drive circuits 51 and 52 and the motor drive circuit 51 can be avoided. , 52 (for example, power supply circuits 61 and 62 for supplying power to the motor drive circuits 51 and 52, and other loads Lo when the power supply circuits 61 and 62 are connected to other loads Lo) Can be prevented from breaking down.

  In the first to sixth embodiments, the transport rollers 33 and 255 for transporting the recording sheet P and the original G are coupled to the motors M1 and M2, and the cover members (410, 420), 430 is configured to be opened when the recording sheet P and the original G are removed from the transport rollers 33 and 255. When the recording sheet P and the original G are removed, the cover members 410 and 420 are provided. ), 430 is in the open state, the connection between the motors M1 and M2 and the motor drive circuits 51 and 52 can be cut off when the recording sheet P or the original G is removed. Even if the back electromotive force E is generated in the motors M1 and M2 by pulling out the recording sheet P or the original G, the current Ie accompanying the generation of the back electromotive force E is the motor drive circuits 51 and 52. It can be avoided from flowing, thereby, connected circuitry to the motor drive circuits 51 and 52 and motor drive circuits 51 and 52 it is possible to prevent the failure.

  In the fourth to sixth embodiments, the connection circuits 53 and 54 that connect the motors M1 and M2 and the motor drive circuits 51 and 52 are connected to the main body 10a of the printing apparatus 10 and the main body 2a of the image reading apparatus 2, respectively. Both the cover members (410, 420) and 430 are connected to each other when the cover members (410, 420) and 430 are closed, while the cover members (410, 420) and 430 are open. Drawer connectors (414, 424), 434 provided so as to be disconnected, and connection wiring for connecting motors M1, M2 and motor drive circuits 51, 52 via drawer connectors (414, 424), 434 By including L1 (L11, L12, L13) and L2 (L21, L22, L23), as in the first to third embodiments, the cover portion (410, 420), compared to the case of using the switches (413, 423), 433 that operate in conjunction with opening and closing of the 430, space saving and connection wiring L1 (L11, L12, L13), L2 (L21, L22) , L23) can be simplified.

  In the present embodiment, the printing apparatus 10 and the image reading apparatus 2 provided in the image forming apparatus 1 are exemplified as the motor driving apparatus according to the present invention. However, the motor driving apparatus according to the present invention is limited thereto. For example, a sheet supply device (specifically, a one-stage or multi-stage paper feed desk or a large capacity paper feed tray) that is provided in the image forming apparatus 1 and supplies the recording sheet P to the printing apparatus 10. Also good.

  The present invention is not limited to the embodiment described above, and can be implemented in various other forms. Therefore, such an embodiment is merely an example in all respects and should not be interpreted in a limited manner. The scope of the present invention is shown by the scope of claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 10 Printing apparatus (an example of a motor drive device)
10a Body 2 Image reading device (an example of a motor driving device)
2a body 223 transport roller 225 transport roller 33 transport roller 37 drive transmission mechanism 38 drive transmission mechanism 400a movable section 400b connection side 400c connection side 410 cover member 411 cover body section 412 slide member 413 switch 414 drawer connector 415 release lever 420 cover member 421 Cover body 422 Rotating shaft 423 Switch 424 Drawer connector 425 Release lever 430 Cover member 430a Switch operating unit 431 Cover body 432 Rotating shaft 433 Switch 434 Drawer connector 434a Body side connector 434b Cover member side connector 435 Release lever 51 Motor drive Circuit 52 Motor drive circuit 53 Connection circuit 54 Connection circuit 61 Power supply circuit 62 Power supply circuit E Back electromotive force G Document H Locking hole IL Interlock mechanism Ie Flow K Engagement projection L Coil L1 Connection line L2 Connection line L3 Connection line La First connection part Lb Second connection part Lc Third connection part Lo Load M1 Motor M2 Motor P Recording sheet R1 Sheet conveyance path R1a Inversion path R2 Sheet conveyance Path SW1 Semiconductor switch SW2 Semiconductor switch T1 Feed terminal T2 Feed terminal Ta Motor connection terminal Tb Motor drive circuit connection terminal Tc Motor connection terminal Td Motor drive circuit connection terminal Vcc Power supply voltage Vdd Output voltage Vm Terminal voltage X Depth direction Y Width direction Z Vertical direction

Claims (4)

A motor, a motor drive circuit that drives the motor, a connection circuit that connects the motor and the motor drive circuit, an open state that exposes the inside of the body of the motor drive device, and the interior of the body of the motor drive device A motor drive device including a cover member capable of taking a closed state,
The connection circuit that connects the motor and the motor drive circuit cuts off the connection between the motor and the motor drive circuit when the cover member is in the open state, and the cover member is in the closed state. In some cases, the motor drive device is configured to connect the motor and the motor drive circuit. The motor drive device according to claim 1,
The transport roller that transports the sheet and the motor are linked to each other.
The motor driving device according to claim 1, wherein the cover member is configured to take the open state when the sheet is removed from the transport roller. The motor driving device according to claim 1 or 2,
The connection circuit for connecting the motor and the motor drive circuit is connected to both the main body of the motor drive device and the cover member when the cover member is in a closed state, while the cover member is opened. A motor drive comprising: a drawer connector provided so that the connection is released in a state; and a connection wiring for connecting the motor and the motor drive circuit via the drawer connector apparatus.   An image forming apparatus comprising the motor driving device according to any one of claims 1 to 3.

Images