JP6008231B2 - A motor, a motor driving device, a sheet conveying device, and an image forming apparatus; - Google Patents

Description

  The present invention relates to a motor including a case containing a coil and a magnet, a disk fixed to a motor shaft, and a circuit board on which rotation detection means for detecting movement in the rotation direction of the disk is mounted. The present invention also relates to a motor driving device, a sheet conveying device, and an image forming apparatus using such a motor.

  As this type of motor, the one described in Patent Document 1 is known. FIG. 21 is a perspective view showing a motor 900 described in Patent Document 1. As shown in FIG. The motor 900 includes a case 901, a motor shaft 902, a code wheel 903, a circuit board 904, a holding base 906 as a holding means, an electrode terminal 907 as a conductive member, and the like. A motor shaft 902 projects from the tip of the case 901 containing the magnet and coil and the bottom plate 901a. Outside the case 901, a code hole 903 as a disk is fixed to the rear end portion of the motor shaft 902 and rotates together with the motor shaft 902. The code hole 903 is provided with a plurality of slits arranged at a predetermined pitch in the rotation direction. A holding base 906 that holds the circuit board 904 is fixed to the bottom plate 901 a of the case 901. The optical sensor 905 mounted on the circuit board 904 detects the wheel slit as the code wheel 903 rotates, whereby the rotation speed of the motor is detected.

  Two electrode terminals 902 for guiding a voltage to the coil in the case protrude from the bottom plate 901a of the case 901. The circuit board 904 is held by a holding table 906 in such a posture that the wiring formation surface faces the bottom plate 901a, and an electrode pad (not shown) for soldering the electrode terminals 907 is provided on the wiring formation surface.

  In the motor 900 having such a configuration, when the electrode terminal 907 is soldered to the electrode pad of the circuit board 904, the solder may be scattered and adhered to the code wheel 903. Specifically, the soldering is performed on the back side of the circuit board 904. The solder scattered from the soldering position toward the right side in the drawing adheres to the back surface of the circuit board 904 before reaching the code wheel 903. However, since the circuit board 904 does not exist on the left side in the drawing from the electrode terminal 907, the solder scattered from the soldering position toward the left side in the drawing adheres to the code hole 903. If the solder adheres to the code wheel 903, it becomes difficult for the optical sensor 905 to detect the slit appropriately, and the detection accuracy of the rotational speed is lowered.

  The present invention has been made in view of the above background, and an object thereof is to provide the following motor, motor driving device, sheet conveying device, and image forming apparatus. That is, a motor or the like that can prevent a decrease in detection accuracy of the motor rotation speed due to the attachment of solder to a disk such as a code wheel.

In order to achieve the above object, the present invention provides a case containing a coil or a magnet, a disk fixed to a motor shaft protruding from the case, and a rotation detection for detecting movement in the rotation direction of the disk. A circuit board on which the means is mounted; a conductive member protruding from the case; and a holding means for holding the circuit board at a position between the disk and the outer surface while being fixed to the outer surface of the case. In a motor in which the conductive member is soldered to a conductive part for soldering provided on the wiring forming surface, with the surface opposite to the wiring forming surface of the circuit board facing the disk, The substrate non-facing region is covered by facing a substrate non-facing region, which is a region not facing the circuit board in the motor axial direction, of the entire circular surface of the disk fixed to the motor shaft. Hidden the cover member than said circuit board in the motor axis direction invisible from the position of the wiring formation surface side is provided, a through hole for guiding the conductive member to the circuit board by penetrating himself to the holding means, and The covering member is integrally formed with the holding means .

  In the present invention, at the position on the wiring forming surface side of the circuit board where the soldering operation is performed, the entire area of the disk is covered by the combination of the circuit board and the covering member. For this reason, even when the solder is scattered around the conductive member during the soldering operation performed at the position on the wiring forming surface side of the circuit board, the solder is blocked by the circuit board or the covering member and does not adhere to the disk. Is prevented. Therefore, it is possible to prevent a decrease in detection accuracy of the motor rotation speed due to the solder being attached to the disk.

1 is a schematic configuration diagram showing a copier according to an embodiment. FIG. 2 is a partial configuration diagram illustrating an enlarged part of an image forming unit in the copier. FIG. 3 is a partial enlarged view showing a part of a tandem part composed of four image forming units in the image forming part. FIG. 2 is a perspective view showing a scanner and an ADF of the copier. The expanded block diagram which shows the principal part structure of the same ADF with the upper part of a scanner. FIG. 3 is a plan configuration diagram illustrating a motor driving device for rotationally driving a first conveying roller of a pair of conveying rollers in the sheet feeding device of the copier. The expansion perspective view which shows the conveyance motor of the motor drive device from the front. The perspective view which shows the 1st example of the code wheel mounted in the conveyance motor. The perspective view which shows the 2nd example of the same code wheel. The perspective view which shows the same conveyance motor of the state which removed the circuit board. The perspective view which shows the same conveyance motor. The perspective view which shows the holding stand of the conveyance motor. The perspective view which shows the same holding stand from the side. The perspective view which shows the same conveyance motor just before inserting a circuit board in the same holding stand. The side view explaining the backlash of the circuit board on a holding stand. The side view which shows the holding stand of the conveyance motor. The block diagram which shows the principal part of the electric circuit in the motor drive device. FIG. 2 is a plan configuration diagram showing a motor driving device for rotationally driving a reading entrance roller of the ADF of the copier. FIG. 9 is a perspective view showing a rear end portion of a conveyance motor 210 of a copying machine according to a first modification. FIG. 9 is a schematic configuration diagram illustrating an image forming unit 1 of a copying machine according to a second modification. FIG. 9 is a schematic configuration diagram showing a copying machine according to a third modification. The perspective view which shows the motor of patent document 1. FIG.

Hereinafter, an embodiment in which the present invention is applied to an electrophotographic copying machine (hereinafter simply referred to as a copying machine) will be described.
First, a basic configuration of the copying machine according to the embodiment will be described. FIG. 1 is a schematic configuration diagram illustrating a copying machine according to an embodiment. The copying machine includes an image forming unit 1 as an image forming apparatus, a sheet supply device 40, and an image reading unit 50. The image reading unit 50 as an image reading apparatus includes a scanner 150 fixed on the image forming unit 1 and an automatic document feeder (hereinafter referred to as ADF) 51 as a sheet conveying device supported by the scanner 150. ing.

  The sheet supply device 40 includes two paper feed cassettes 42 arranged in multiple stages in the paper bank 41, a feed roller 43 that feeds recording sheets from the paper feed cassette, and a separation roller that separates the sent recording sheets one by one. 45 etc. In addition, a plurality of conveyance roller pairs 46 that convey a recording sheet as a sheet member to the sheet feeding path 37 as a conveyance path of the image forming unit 1 are also provided.

  The paper feed cassette 42 is housed inside in a state of a sheet bundle in which a plurality of recording sheets are stacked. The sending roller 43 is pressed against the uppermost recording sheet. When the feed roller 43 rotates, the uppermost recording sheet of the sheet bundle is sent out from the paper feed cassette 42.

  In the vicinity of the paper feed cassette 42, the first conveyance roller of the conveyance roller pair 46 and the second conveyance roller disposed on the side (right side in the figure) contact each other to form a conveyance nip. Yes. Further, a separation roller 45 is disposed below the first conveyance roller, and a separation conveyance nip is formed by contacting the first conveyance roller from below.

  The recording sheet sent out from the paper feed cassette 42 by the rotational drive of the sending roller 43 is separated into a separation / conveying nip formed by contact between the first conveying roller of the pair of conveying rollers 46 and the separation roller 45 arranged below the first conveying roller. enter in. In the separation and conveyance nip, the conveyance force directed from the sheet feeding cassette 42 side to the feeding path 44 side with respect to the recording sheet while the first conveyance roller contacting the upper surface of the recording sheet is rotated counterclockwise in the drawing. Is granted. On the other hand, the separation roller 45 that contacts the lower surface of the recording sheet is rotationally driven in the counterclockwise direction in the figure, and applies a conveying force from the feeding path 44 side to the sheet feeding cassette 42 side to the recording sheet. Thus, the recording sheet is returned to the paper feed cassette 42.

  When only one recording sheet is sent out from the sheet feeding cassette 42, the first conveying roller and the separation roller 45 apply conveying forces in the opposite directions to the recording sheet at the separation and conveyance nip. Thus, a load exceeding a predetermined threshold is applied to the drive transmission system of the separation roller 45. Then, a torque limiter disposed in the drive transmission system is activated to cut off transmission of driving force from a DC brushless motor (not shown) to the separation roller 45. As a result, the separation roller 45 follows the recording sheet conveyed by the first conveyance roller, and the recording sheet is discharged from the separation conveyance nip toward the feeding path 44.

  On the other hand, when a plurality of recording sheets are fed out from the sheet feeding cassette 42, the first conveying roller at the separation / conveying nip feeds the feeding path 44 from the sheet feeding cassette 42 side to the uppermost recording sheet. The uppermost recording sheet is fed from the separation and conveyance nip toward the feeding path 44 side by applying a conveyance force toward the side. On the other hand, the lower recording sheet is fed from the separation / conveying nip by applying a conveying force from the feeding path 44 toward the sheet feeding cassette to the recording sheet on which the separation roller is positioned on the lower side. Return to the paper cassette 42 side. As a result, at the separation and conveyance nip, the uppermost recording sheet is separated from the other recording sheets and is sent out to the feeding path 44 in a single state.

  The recording sheet that has entered the feeding path 44 enters the conveyance nip of the conveyance roller pair 46 and is given a conveyance force from the lower side in the vertical direction toward the upper side. As a result, the recording sheet is conveyed toward the sheet feeding path 37 of the image forming unit 1 in the feeding path 44.

  The image forming unit 1 as an image forming unit includes an optical writing device 2 and four image forming units 3K, Y, and M that form black, yellow, magenta, and cyan (K, Y, M, and C) toner images. , C, transfer unit 24, paper transport unit 28, registration roller pair 33, fixing device 34, switchback device 36, paper feed path 37, and the like. Then, a light source such as a laser diode or LED (not shown) disposed in the optical writing device 2 is driven to irradiate the four drum-shaped photosensitive members 4K, Y, M, and C with the laser light L. . By this irradiation, electrostatic latent images are formed on the surfaces of the photoreceptors 4K, Y, M, and C, and the latent images are developed into toner images via a predetermined development process.

  FIG. 2 is an enlarged partial configuration diagram illustrating a part of the internal configuration of the image forming unit 1. FIG. 3 is a partially enlarged view showing a part of a tandem part composed of four image forming units 3K, Y, M, and C. The four image forming units 3K, Y, M, and C have substantially the same configuration except that the colors of the toners to be used are different from each other. Therefore, in FIG. The subscript C is omitted.

  Each of the image forming units 3K, Y, M, and C is a unit that supports the photosensitive member and various devices disposed around the photosensitive member as a single unit and supports the image forming unit 1 main body. Can be removed. Taking the black image forming unit 3K as an example, this has a charging device 23, a developing device 6, a drum cleaning device 15, a static elimination lamp 22 and the like around the photosensitive member 4. This copying machine has a so-called tandem type configuration in which four image forming units 3K, Y, M, and C are arranged so as to face an intermediate transfer belt 25, which will be described later, along the endless movement direction. ing.

  As the photoreceptor 4, a drum-shaped member is used in which a photosensitive layer is formed by applying a photosensitive organic photosensitive material to a base tube made of aluminum or the like. However, an endless belt may be used.

  The developing device 6 develops the latent image using a two-component developer containing a magnetic carrier and a nonmagnetic toner (not shown). In order to transfer the toner in the two-component developer carried on the developing sleeve 12 to the photosensitive member 4, the agitating unit 7 that conveys the two-component developer accommodated in the inside and supplies the developing sleeve 12 with stirring. Development section 11.

  The stirring unit 7 is provided at a position lower than the developing unit 11, and is provided on the bottom surface of the developing case 9, two conveying screws 8 arranged in parallel to each other, a partition plate provided between these screws. A toner density sensor 10 and the like are included.

  The developing unit 11 includes a developing sleeve 12 that faces the photosensitive member 4 through the opening of the developing case 9, a magnet roller 13 that is non-rotatably provided inside the developing sleeve 12, a doctor blade 14 that approaches the developing sleeve 12, and the like. ing. The developing sleeve 12 has a non-magnetic rotatable cylindrical shape. The magnet roller 12 has a plurality of magnetic poles that are sequentially arranged from the position facing the doctor blade 14 in the rotational direction of the sleeve. Each of these magnetic poles applies a magnetic force to the two-component developer on the sleeve at a predetermined position in the rotation direction. As a result, the two-component developer sent from the stirring unit 7 is attracted and carried on the surface of the developing sleeve 13 and a magnetic brush is formed along the magnetic field lines on the sleeve surface.

  The magnetic brush is regulated to an appropriate layer thickness when passing through the position facing the doctor blade 14 as the developing sleeve 12 rotates, and then conveyed to the developing region facing the photoconductor 4. Then, the toner is transferred onto the electrostatic latent image by the potential difference between the developing bias applied to the developing sleeve 12 and the electrostatic latent image on the photosensitive member 4, thereby contributing to development. Further, as the developing sleeve 12 rotates, the developing sleeve 12 is returned to the developing portion 11 again, and after being separated from the sleeve surface by the influence of the repulsive magnetic field formed between the magnetic poles of the magnet roller 13, the developing sleeve 12 is returned to the stirring portion 7. An appropriate amount of toner is supplied to the two-component developer in the stirring unit 7 based on the detection result of the toner density sensor 10. The developing device 6 may employ a one-component developer that does not include a magnetic carrier, instead of one that uses a two-component developer.

  As the drum cleaning device 15, a system in which the cleaning blade 16 made of an elastic body is pressed against the photoconductor 4 is used, but another system may be used. For the purpose of enhancing the cleaning property, this example employs a system having a contact conductive fur brush 17 whose outer peripheral surface is in contact with the photoreceptor 4 so as to be rotatable in the direction of the arrow in the figure. The fur brush 17 also serves to apply the lubricant to the surface of the photosensitive member 4 while scraping the lubricant from a solid lubricant (not shown) into a fine powder. A metal electric field roller 18 for applying a bias to the fur brush 17 is rotatably provided in the direction of the arrow in the figure, and the tip of the scraper 19 is pressed against it. The toner attached to the fur brush 17 is transferred to the electric field roller 18 to which a bias is applied while rotating in contact with the fur brush 17 in the counter direction. Then, after being scraped from the electric field roller 18 by the scraper 19, it falls onto the recovery screw 20. The collection screw 20 conveys the collected toner toward the end of the drum cleaning device 15 in the direction orthogonal to the drawing sheet surface, and transfers it to the external recycling conveyance device 21. The recycle conveyance device 21 sends the delivered toner to the developing device 15 for recycling.

  The neutralization lamp 22 neutralizes the photoreceptor 4 by light irradiation. The surface of the photoreceptor 4 that has been neutralized is uniformly charged by the charging device 23 and then subjected to optical writing processing by the optical writing device 2. As the charging device 23, a charging device that rotates a charging roller to which a charging bias is applied while contacting the photosensitive member 4 is used. A scorotron charger or the like that performs a non-contact charging process on the photoreceptor 4 may be used.

  In FIG. 2 described above, the K, Y, M, and C toner images are transferred to the photoreceptors 4K, Y, M, and C of the four image forming units 3K, Y, M, and C by the processes described above. It is formed.

  A transfer unit 24 is arranged below the four image forming units 3K, Y, M, and C. The transfer unit 24 as a belt driving device moves the intermediate transfer belt 25 stretched by a plurality of rollers endlessly in the clockwise direction in the drawing while contacting the photoreceptors 4K, Y, M, and C. As a result, primary transfer nips for K, Y, M, and C in which the photoreceptors 4K, Y, M, and C abut the intermediate transfer belt 25 that is an endless belt member are formed. In the vicinity of the primary transfer nips for K, Y, M, and C, the intermediate transfer belt 25 is moved to the photoreceptors 4K, Y, M, and C by primary transfer rollers 26K, Y, M, and C disposed inside the belt loop. Pressing toward C. A primary transfer bias is applied to the primary transfer rollers 26K, Y, M, and C by a power source (not shown). As a result, a primary transfer electric field for electrostatically moving the toner images on the photoreceptors 4K, Y, M, and C toward the intermediate transfer belt 25 is formed in the primary transfer nips for K, Y, M, and C. Has been. In the drawing, a toner image is formed on each of the primary transfer nips on the front surface of the intermediate transfer belt 25 that sequentially passes through the primary transfer nips for K, Y, M, and C with endless movement in the clockwise direction. Are sequentially superimposed and primarily transferred. By this primary transfer of superposition, a four-color superposed toner image (hereinafter referred to as a four-color toner image) is formed on the front surface of the intermediate transfer belt 25.

  Below the transfer unit 24 in the figure, a paper transport unit 28 is provided between the drive roller 30 and the secondary transfer roller 31 to endlessly move the endless paper transport belt 29. The intermediate transfer belt 25 and the paper transport belt 29 are sandwiched between the secondary transfer roller 31 and the lower stretching roller 27 of the transfer unit 24. As a result, a secondary transfer nip is formed in which the front surface of the intermediate transfer belt 25 and the front surface of the paper transport belt 29 come into contact with each other. A secondary transfer bias is applied to the secondary transfer roller 31 by a power source (not shown). On the other hand, the lower stretching roller 27 of the transfer unit 24 is grounded. Thereby, a secondary transfer electric field is formed in the secondary transfer nip.

  A registration roller pair 33 is disposed on the right side of the secondary transfer nip in the drawing. A registration roller sensor (not shown) is disposed near the entrance of the registration nip of the registration roller pair 33. The recording sheet conveyed from the sheet supply device (not shown) toward the registration roller pair 33 is temporarily stopped after a predetermined time when the leading edge is detected by the registration roller sensor, and the registration nip of the registration roller pair 33 is stopped. Butt the tip.

  When the prior application of the recording sheet hits the registration nip, the registration roller pair 33 resumes roller rotation driving at a timing at which the recording sheet can be synchronized with the four-color toner image on the intermediate transfer belt 25, and the recording sheet is moved to the secondary position. Send to transfer nip. In the secondary transfer nip, the four-color toner images on the intermediate transfer belt 25 are collectively transferred to the recording sheet by the action of the secondary transfer electric field and the nip pressure, and become a full color image combined with the white color of the recording sheet. The recording sheet that has passed through the secondary transfer nip is separated from the intermediate transfer belt 25 and is conveyed to the fixing device 34 along with its endless movement while being held on the front surface of the paper conveyance belt 29.

  Transfer residual toner that has not been transferred to the recording sheet at the secondary transfer nip is attached to the surface of the intermediate transfer belt 25 that has passed through the secondary transfer nip. This transfer residual toner is scraped off and removed by a belt cleaning device in contact with the intermediate transfer belt 25.

  The recording sheet conveyed to the fixing device 34 is fixed to a full color image by pressurization or heating in the fixing device 34, and then sent from the fixing device 34 to the paper discharge roller pair 35 and then to the outside of the apparatus. Discharged.

  In FIG. 1 described above, a switchback device 36 is disposed under the paper transport unit 22 and the fixing device 34. As a result, the recording sheet that has undergone the image fixing process on one side is switched by the switching claw to the recording sheet reversing device side, where it is reversed and enters the secondary transfer transfer nip again. Then, after the secondary transfer process and the fixing process of the image are performed on the other side, the sheet is discharged onto a discharge tray.

  The scanner 150 fixed on the image forming unit 1 and the ADF 51 fixed on the scanner 150 have a fixed reading unit and a moving reading unit 152. The moving reading unit 152 is disposed immediately below a second contact glass (not shown) fixed to the upper wall of the casing of the scanner 150 so as to come into contact with the document MS, and illustrates an optical system including a light source and a reflection mirror. It can be moved in the middle / left / right direction. Then, in the process of moving the optical system from the left side to the right side in the figure, the light emitted from the light source is reflected by a document (not shown) placed on the second contact glass and then passed through a plurality of reflecting mirrors. The light is received by the image reading sensor 153 fixed to the scanner body.

  On the other hand, the fixed reading unit includes a first surface fixed reading unit 151 disposed in the scanner 150 and a second surface fixed reading unit (not shown) disposed in the ADF 51. A first surface fixed reading unit 151 having a light source, a reflection mirror, an image reading sensor such as a CCD, etc. is arranged directly below a first contact glass (not shown) fixed to the upper wall of the casing of the scanner 150 so as to contact the document MS. It is installed. Then, when a document MS conveyed by the ADF 51 described later passes over the first contact glass, the light emitted from the light source is sequentially reflected on the document surface and received by the image reading sensor via a plurality of reflecting mirrors. To do. Thus, the first surface of the document MS is scanned without moving the optical system including the light source and the reflection mirror. The second surface fixed reading unit scans the second surface of the document MS after passing through the first surface fixed reading unit 151.

  An ADF 51 disposed on the scanner 150 includes a document placing table 53 for placing the document MS before reading on the main body cover 52, a transport unit 54 for transporting the document MS as a sheet member, and after reading. A document stacking table 55 for stacking the originals MS is held. As shown in FIG. 4, it is supported by a hinge 159 fixed to the scanner 150 so as to be swingable in the vertical direction. Then, by swinging, it moves like an open / close door, and the first contact glass 154 and the second contact glass 155 on the upper surface of the scanner 150 are exposed in the opened state. In the case of a single-sided original such as a book in which one corner of the original bundle is bound, the originals cannot be separated one by one and cannot be transported by ADF. Therefore, in the case of a single-sided original, the ADF 51 is opened as shown in FIG. 4, and then the single-sided original with the page to be read open is placed face down on the second contact glass 154, and then the ADF is close up. Then, the image of the page is read by the moving reading unit 152 shown in FIG.

  On the other hand, in the case of a document bundle in which a plurality of document MSs independent from each other are simply stacked, the document MS is automatically conveyed one by one by the ADF 51 while the first surface fixed reading unit 151 in the scanner 150 or the first document in the ADF 51. The two-surface fixed reading unit can sequentially read. In this case, after setting the document bundle on the document placing table 53, a copy start button (not shown) is pressed. Then, the ADF 51 sends the originals MS of the original bundle placed on the original placement table 53 into the conveyance unit 54 in order from the top, and conveys the original MS toward the original stack table 55 while inverting it. In the course of this conveyance, immediately after the document MS is reversed, the original MS is passed directly over the first surface fixed reading unit 151 of the scanner 150. At this time, the image on the first surface of the document MS is read by the first surface fixed reading unit 151 of the scanner 150.

  FIG. 5 is an enlarged configuration diagram showing the main configuration of the ADF 51 together with the upper portion of the scanner 150. The ADF 51 includes a document setting unit A, a separation feeding unit B, a registration unit C, a turn unit D, a first reading conveyance unit E, a second reading conveyance unit F, a paper discharge unit G, a stack unit H, and the like.

  The document setting unit A includes a document placement table 53 on which a bundle of documents MS is set. The separation feeding unit B separates and feeds the originals MS one by one from the set of originals MS set. The registration unit C temporarily abuts on the fed original MS and aligns the original MS to send it out. Further, the turn portion D has a curved conveyance portion that is curved in a C-shape, and the document MS is turned upside down in the curved conveyance portion so as to be turned upside down. The first reading / conveying unit E conveys the document MS on the first contact glass 155 and is disposed below the first contact glass 155 and inside the scanner (not shown). Is to read the first side of the document MS. The second reading / conveying unit F allows the second fixed reading unit 95 to read the second surface of the document MS while conveying the document MS under the second fixed reading unit 95. The paper discharge unit G discharges the original MS from which both-side images are read toward the stack unit H. The stack unit H stacks the original MS on the stack table 55.

  The original MS is placed on the movable original table 54 that can swing in the directions of arrows a and b in the drawing according to the thickness of the bundle of originals MS, and the rear end of the original is placed on the original table 53. It is set in the state of being put on. At this time, the position in the width direction is adjusted by abutting side guides (not shown) against both ends in the width direction (the direction orthogonal to the drawing surface) on the document placement table 53. The document MS set in this way pushes up the lever member 62 that is swingably disposed above the movable document table 54. Accordingly, the document set sensor 63 detects the setting of the document MS and transmits a detection signal to a controller (not shown). This detection signal is sent from the controller to the reading control unit of the scanner via the I / F.

  The document placing table 53 holds a first length sensor 57 and a second length sensor 58 which are made of a reflective photosensor or an actuator type sensor for detecting the length of the document MS in the conveyance direction. These length sensors detect the length of the document MS in the conveyance direction.

  Above the bundle of documents MS placed on the movable document table 54, a pickup roller 80 supported by a cam mechanism so as to be movable in the vertical direction (arrow c and d directions in the figure) is disposed. . This cam mechanism can be driven by a pickup motor 56 to move the pickup roller 80 up and down. When the pickup roller 80 moves upward, the movable document table 54 swings in the direction of arrow a in the drawing, and the pickup roller 80 contacts the uppermost document MS in the bundle of documents MS. When the movable document table 54 further rises, the table rise detection sensor 59 eventually detects the rise of the movable document table 54 to the upper limit. As a result, the pickup motor 56 stops and the movable document table 54 stops rising.

  For the main body operation unit consisting of a numeric keypad and a display provided in the main body of the copying machine, the operator performs key operations for setting the reading mode indicating the double-sided reading mode or the single-sided reading mode, and a copy start key. Is pressed. When the copy start key is pressed, a document feed signal is transmitted from a main body control unit (not shown) to the controller of the ADF 51. Then, the pickup roller 80 is rotationally driven by the normal rotation of the paper feed motor 76 to send out the original MS on the movable original table 54 from the movable original table 54.

  When setting the double-sided reading mode or the single-sided reading mode, it is possible to collectively set the double-sided or single-sided setting for all the originals MS placed on the movable original table 54. Also, the first and tenth originals MS are set to the double-sided reading mode, while the other originals MS are set to the single-sided reading mode. Can also be set.

  The document MS sent out by the pickup roller 80 serving as a sending member enters the separation conveyance unit B and is sent to a contact position with the paper feed belt 84. The paper feed belt 84 is stretched by a drive roller 82 and the like, and is endlessly moved in the clockwise direction in the drawing by the rotation of the drive roller 82 accompanying the forward rotation of the paper feed motor 76. A separation roller 85 that is driven to rotate clockwise in the drawing by the forward rotation of the paper feed motor 76 is in contact with the lower stretched surface of the paper feed belt 84. At the contact portion, the surface of the paper feed belt 84 moves in the paper feed direction. On the other hand, the separation roller 85 is in contact with the paper feed belt 84 at a predetermined pressure, and when the paper is in direct contact with the paper feed belt 84 or only one original MS is sandwiched between the contact portions. At that time, it is carried around to the belt or the document MS. However, when a plurality of documents MS are sandwiched between the contact portions, the accompanying force is lower than the torque of the torque limiter, so that the document is rotated clockwise in the figure opposite to the accompanying direction. As a result, a moving force in the direction opposite to the paper feed is applied to the original MS below the uppermost position by the separation roller 85, and only the uppermost original MS is separated from several originals.

  The original MS separated into one sheet by the action of the paper feed belt 84 and the separation roller 85 enters the registration portion C. Then, the tip is detected when passing just below the butting sensor 72. At this time, the pickup roller 80 receiving the driving force of the pickup motor 56 is still driven to rotate. However, the original MS is separated from the original MS by the lowering of the movable original table 54, so that the original MS has an endless moving force of the paper feed belt 84. Only conveyed by. Then, the endless movement of the paper feeding belt 84 continues for a predetermined time from the timing when the leading edge of the document MS is detected by the abutment sensor 72, and the leading edge of the document MS is driven to rotate while being in contact with the pull-out driving roller 86. It abuts against the contact portion with the pullout drive roller 87.

  The pull-out driven roller 87 plays a role of transporting the document MS to the intermediate roller pair 66 on the downstream side in the document transport direction, and is driven to rotate by the reverse rotation of the paper feed motor 76. When the paper feed motor 76 rotates in the reverse direction, the pull-out driven roller 87 and one of the rollers in the intermediate roller pair 66 in contact with each other start to rotate, and the endless movement of the paper feed belt 84 stops. At this time, the rotation of the pickup roller 80 is also stopped.

  The document MS sent from the pull-out driven roller 87 passes directly below the document width sensor 73. The document width sensor 73 has a plurality of paper detection units including reflection type photosensors, and these paper detection units are arranged in the document width direction (direction orthogonal to the drawing sheet). Based on which paper detection unit detects the document MS, the size of the document MS in the width direction is detected. The length of the document MS in the conveyance direction is detected based on the timing from when the leading edge of the document MS is detected by the abutting sensor 72 until the trailing edge of the document MS is not detected by the abutting sensor 72. .

  The leading edge of the document MS whose size in the width direction is detected by the document width sensor 73 enters the turn portion D and is sandwiched between the abutting portions between the rollers of the intermediate roller pair 66. The conveyance speed of the original MS by the intermediate roller pair 66 is set to be higher than the conveyance speed of the original MS in the first reading conveyance section E described later. This shortens the time until the document MS is sent to the first reading conveyance unit E.

  The leading edge of the document MS conveyed in the turn part D passes through the position where the document leading edge faces the reading entrance sensor 67. As a result, when the leading edge of the document MS is detected by the reading inlet sensor 67, the leading edge of the original MS is conveyed to the position of the pair of reading inlet rollers (a pair of 89 and 90) on the downstream side in the conveying direction. The document conveyance speed by the roller pair 66 is reduced. Further, with the start of rotation of the reading motor (not shown), one roller in the reading inlet roller pair (89, 90), one roller in the reading outlet roller pair 92, and one roller in the second reading outlet roller pair 93. Starts rotating.

  In the turn section D, the upper and lower surfaces are reversed and the conveyance direction is folded while the document MS is conveyed on the curved conveyance path between the intermediate roller pair 66 and the reading entrance roller pair (89, 90). . Then, the leading edge of the document MS that has passed through the nip between the rollers of the reading entrance roller pair (89, 90) passes directly below the registration sensor 65. When the leading edge of the document MS is detected by the registration sensor 65 at this time, the document transport speed is reduced while applying a predetermined transport distance, and the transport of the document MS is temporarily stopped before the first reading transport unit E. . Further, a registration stop signal is transmitted to a reading control unit (not shown).

  When the reading control unit that has received the registration stop signal transmits a reading start signal, the rotation of the reading motor is resumed until the leading edge of the document MS reaches the first reading conveyance unit E under the control of the controller of the ADF 51. The conveyance speed of the document MS is increased to the conveyance speed of. Then, at the timing when the leading edge of the document MS calculated based on the pulse count of the reading motor reaches the reading position by the first fixed reading unit 151, the controller scans the first surface of the document MS with respect to the reading control unit. A gate signal indicating a direction effective image area is transmitted. This transmission is continued until the trailing edge of the document MS exits the reading position by the first fixed reading unit 151, and the first surface of the document MS is read by the first fixed reading unit 151.

  The document MS that has passed through the first reading conveyance unit E passes through a reading exit roller pair 92 described later, and then the leading end of the document MS is detected by the paper discharge sensor 61. When the single-sided reading mode is set, reading of the second side of the document MS by the second fixed reading unit 95 described later is not necessary. Accordingly, when the leading edge of the document MS is detected by the paper discharge sensor 61, the forward rotation drive of the paper discharge motor is started, and the lower paper discharge roller in the drawing roller pair 94 in the drawing in the clockwise direction in the drawing. Driven by rotation. Further, the timing at which the trailing edge of the document MS exits the nip of the discharge roller pair 94 is calculated based on the discharge motor pulse count after the leading edge of the document MS is detected by the discharge sensor 61. Based on this calculation result, the drive speed of the discharge motor is decelerated at the timing immediately before the trailing edge of the document MS comes out of the nip of the discharge roller pair 94, and the document MS jumps out of the stack base 55. Paper is discharged at such a speed.

  On the other hand, when the double-sided reading mode is set, the timing until the paper MS reaches the second fixed reading unit 95 after the leading edge of the document MS is detected based on the pulse count of the reading motor. Calculated. At that timing, a gate signal indicating an effective image area in the sub-scanning direction on the second surface of the document MS is transmitted from the controller to the reading control unit. This transmission is continued until the trailing edge of the document MS exits the reading position by the second fixed reading unit 95, and the second surface of the document MS is read by the second fixed reading unit 95.

  The second fixed reading unit 95 as a reading unit includes a contact image sensor (CIS), and for the purpose of preventing a reading vertical streak caused by a paste-like foreign material adhering to the document MS adhering to the reading surface. The reading surface is coated. A second reading roller 96 serving as a document supporting unit that supports the document MS from the non-reading surface side is disposed at a position facing the second fixed reading unit 95. The second reading roller 96 serves to prevent the document MS from floating at the reading position by the second fixed reading unit 95 and to function as a reference white portion for acquiring shading data in the second fixed reading unit 95. I'm in charge.

  As described above, in the feeding path 44 of the sheet feeding device 40 in FIG. 1, the recording sheet is applied with the conveying force directed upward at the conveyance nip of the conveyance roller pair 46, so that the recording sheet becomes the image forming unit 1. It is conveyed toward the paper feed path 37.

  FIG. 6 is a plan configuration diagram showing a motor driving device for rotationally driving the first conveying roller 46 a of the conveying roller pair 46. The motor drive device includes a motor control circuit 200, a transport motor 210 including an inner rotor type DC brushless motor, and a speed reducer 225.

  The motor control circuit 200 functions as a control unit that controls the rotational drive of the transport motor 210 based on a detection result by a motor encoder described later. When the motor shaft 214 of the transport motor 210 rotates by driving the transport motor 210, the rotational speed of the motor gear 213 fixed to the motor shaft 214 is decelerated by the speed reducer 225, and then the first transport roller 46a as a driven body. Is transmitted to.

  The speed reducer 225 rotates on the same rotational axis as the first speed reduction gear 221 that meshes with the motor gear 213, the second speed reduction gear 222 that meshes with this, the third speed reduction gear 223 that meshes with this, and the first transport roller 46a. As described above, the fourth reduction gear meshes with the third reduction gear 223 while being fixed to the shaft member of the first conveying roller 46a.

  Next, a characteristic configuration of the copier according to the embodiment will be described. FIG. 7 is an enlarged perspective view showing the transport motor 210 of the motor drive device from the rear. The motor shaft 213 of the transport motor 210 protrudes forward from the tip of the motor case and protrudes rearward from the bottom plate of the motor case.

  A holding base 218 holding the circuit board 216 is fixed to the bottom plate of the motor case. A circuit board 216 held on the holding table 218 is provided with a driver circuit (212 in FIG. 6) for exciting the three-phase coils of the transport motor 210 in a predetermined order.

  The transport motor 210 has a motor encoder 211 as rotation detection means. The motor encoder 211 includes a code wheel 211a as a disk and an optical sensor 211b made of a transmission type photosensor. The code wheel 211a rotates on the same rotational axis as the motor shaft 213 in accordance with the rotation of the motor shaft 213 while being fixed at a position behind the circuit board 216 in the motor shaft 213. As shown in FIG. 8, a plurality of slits SL arranged at a predetermined pitch in the rotation direction are provided. The optical sensor 211b is fixed to the circuit board 216 so as to sequentially detect the slits SL as the code wheel 211a rotates (see FIG. 7).

  As the code wheel 211a, the one obtained by processing the wheel main body and the slit SL by punching a metal plate is used. Instead of the code wheel 211a, a code wheel 211a shown in FIG. 9 may be used. The code wheel 211a includes a plurality of dark portions DP that are arranged at a predetermined pitch in the rotation direction as marks. The dark part DP is formed by a half etching process using a photolithography method. When this code wheel 211a is used, the optical sensor 211b is made of a reflective photosensor instead of a transmissive photosensor so that the dark portion DP is detected by the difference in light reflectivity. You can do it.

  FIG. 10 is a perspective view showing the transport motor 210 with the circuit board removed. In addition to the motor shaft 213 projecting from the bottom plate of the motor case of the transport motor 210, two electrode terminals 219 project. The electrode terminal 219 as a conductive member is for guiding a voltage to a coil inside the motor case, and is disposed at a point-symmetrical position around the motor shaft 213.

  FIG. 11 is a perspective view showing the holding table 218. The holding base 218 includes a bearing insertion opening 218a, a non-holding portion 218b, two through holes 218c, two urging claws 218d, a receiving portion 218e, a hook 218f, two abutment rods 218g, and the like. The bearing insertion opening 218a is for penetrating the motor shaft (213) together with the bearing. In the holding base 218, a half-use region around the bearing insertion opening 218a is a semicircular non-holding portion 218b that does not hold the circuit board (216). The remaining area serves as a holding unit that holds the circuit board.

  Unlike the conventional holding table, the holding table 218 has a non-holding portion 218b that does not hold the circuit board in a shape that is not cut in the motor rotation direction. And it mounts | wears with a motor case in the state which fitted the bearing of the motor with respect to the through-hole 218a for bearing insertion. The non-holding portion 218b faces the substrate non-facing region, which is a region that does not face the circuit board 216 in the motor axial direction, out of the entire circular surface of the code wheel 211a fixed to the motor shaft 213. It functions as a covering member that covers and hides the non-opposing region from the position on the wiring forming surface side of the circuit board 216 in the motor axis direction.

  The two through holes 218c provided in the holding portion of the holding table 218 are for penetrating the electrode terminals (219 in FIG. 10) of the motor and guiding them to the circuit board. Since the holding base 218 includes the through hole 218c, the holding base 218 has a larger size in the motor rotation radius direction than the conventional holding base provided only in the region closer to the motor shaft than the electrode terminal. It has become. And the non-holding location 218b without a cut | interruption in the rotation direction faces all the area | regions which are not facing the circuit board 216 among the whole areas of the code wheel 211a, as FIG. 7 shows.

  At the position on the wiring forming surface side of the circuit board 216 where the soldering operation is performed, the entire area of the code wheel 211a is covered with a combination of the circuit board 216 and the non-holding portion (218b) of the holding base 218. For this reason, even if solder or flux scatters around the electrode terminal 219 during the soldering operation performed at the position on the wiring formation surface side of the circuit board 216, the solder or flux remains in the circuit board 216 or the non-holding portion ( 218b) prevents adhesion to the code wheel 211a. Therefore, it is possible to prevent a decrease in detection accuracy of the motor rotation speed caused by attaching solder or flux to the code wheel 211a.

  The combination of the holding base 218 and the circuit board 216 held by the holding base 218 allows the entire projection area in the motor axis direction of the code wheel 211a fixed to the motor shaft 213 to be the projection area in the motor axis direction of itself. It is the size and shape to overlap. The non-holding portion (218b) is integrally formed with the holding base 218.

  In FIG. 11, the receiving portion 218e receives a circuit board (not shown) on the surface opposite to the wheel facing surface, and is provided at a position lower than the wheel facing surface of the non-holding portion 218b. As a result, the circuit board is received at a position lower than the surface of the non-holding portion 218b of the holding base 218.

  Inside the two through holes 218c, urging claws 218d that are cantilevered by the side surfaces of the non-holding portions 218b are arranged in a posture extending in the horizontal direction. Further, in the vicinity of the two through-holes 218c, a contact rod 218g that contacts a wheel facing surface of a circuit board (not shown) is provided.

  FIG. 12 is a perspective view showing the holding table from the side. A circuit board (not shown) is inserted between the abutment bar 218g and the receiving portion 218e on the holding table 218 from the side of the holding table 218 as indicated by an arrow B in the drawing, whereby the holding table 218 is inserted. It is attached to. At this time, since the tip of the hook 218f obstructs the insertion, as shown in FIG. 13, the hook 218f is pressed against the back surface (wiring forming surface) of the circuit board 216 and bent in the direction of arrow A in the figure. . As shown in FIG. 7, the circuit board 216 mounted on the holding base 218 is prevented from being detached from the holding base 218 by being hooked by the hook 218.

  The circuit board 216 is provided with two terminal cutouts 216a for receiving the motor electrode terminals 219 and bearing cutouts 216b for receiving the motor bearings. When the circuit board 216 is inserted into the holding base 218, the motor electrode terminal 219 is positioned in the terminal notch 216 a of the circuit board 216, and the motor bearing is in the bearing notch 216 of the circuit board 216. To position. On the back surface of the circuit board 216, electrode pads 216c for soldering the electrode terminals 219 are provided in the vicinity of the two terminal cutouts 216a. The operator solders the electrode terminal 219 located in the terminal notch 216 a to the electrode pad 216 c of the circuit board 216.

  As shown in FIG. 12, the upper end in the height direction of the urging claw 218d is located at a level slightly higher than the receiving portion 218e. Then, the circuit board is brought into contact with the back surface of the circuit board mounted on the holding base 218, and the circuit board is urged toward the contact bar 218g from the back side. As a result, the circuit board is strongly pressed against the contact flange 218g, and the circuit board is prevented from rattling. If the biasing claw 218d is not provided, as shown in FIG. 14, the circuit board 216 is held on the holding base 218 in an oblique posture by rattling, and the optical sensor 211b mounted on the circuit board 216 is inclined. Since it is in the posture, there is a possibility that the detection accuracy of the rotational speed may be lowered. In this copying machine, the holding claw 218d is provided on the holding base 218, so that the circuit board 216 is prevented from rattling and the circuit board 216 is placed on the holding base 218 in a straight posture as shown in FIG. Hold. As a result, it is possible to prevent a decrease in rotational speed detection accuracy due to holding the circuit board 216 in an oblique posture.

  FIG. 16 is a block diagram illustrating a main part of an electric circuit in the motor drive device. The motor control circuit 200 that controls the driving of the conveyance motor 210 formed of a DC brushless motor is formed as a separate body from the conveyance motor 210 and is fixed to the main body of the image forming unit (1 in FIG. 1).

  It should be noted that the motor control circuit 200 determines the pulse signal frequency after the frequency of the pulse signal sent from the motor encoder 211 has reached a predetermined target frequency, that is, after the rotational speed of the motor has reached a predetermined target speed. The output voltage from the driver circuit 212 is controlled so that the frequency is stabilized at the target frequency. By such constant speed rotation processing, the transport motor 210 is stably rotated at the target speed during the constant speed rotation period.

  In the ADF 51 shown in FIG. 5, as described above, one roller in the reading inlet roller pair (89, 90), one roller in the reading outlet roller pair 92, and one roller in the second reading outlet roller pair 93. Each roller rotates using a reading motor as a driving source. The reading motor is a DC brushless motor having the same configuration as that of the transport motor 210. The motor driving device for driving the reading motor has the same configuration as the motor driving device for driving the transport motor 210. That is, the present invention is also applied to a motor driving device for driving the reading motor.

  FIG. 17 is a plan view showing a motor drive device for rotationally driving the reading entrance roller 89 and the like. This motor drive device has a motor control circuit 300, a reading motor 310 composed of a DC brushless motor, and a speed reducer.

  The motor control circuit 300 functions as a control unit that controls the rotational drive of the reading motor 310 based on the detection result by the motor encoder 311. When the motor shaft 313 is rotated by driving the reading motor 310, the rotational speed of a motor gear (not shown) fixed to the motor shaft is decelerated by a speed reducer and then transmitted to a reading inlet roller 89 as a driven body. The reduction gear 225 includes a first reduction gear 321 meshing with the motor gear, a second reduction gear 322 meshing with the gear, a third reduction gear 323 meshing with the gear, a fourth reduction gear 324 meshing with the gear, and a reading inlet roller 89. And a fifth reduction gear 325 that rotates on the same rotation axis.

  The paper discharge roller pair 94 of the ADF 51 rotates using a paper discharge motor as a drive source. The paper discharge motor is a DC brushless motor having the same configuration as the transport motor 210. The motor driving device for driving the paper discharge motor has the same configuration as the motor driving device for driving the transport motor 210. That is, the present invention is also applied to a motor driving device for driving the paper discharge motor.

Next, a description will be given of a copying machine according to each modification in which a partial configuration of the copying machine according to the embodiment is improved. Unless otherwise specified, the configuration of the copying machine according to each modification is the same as that of the embodiment.
[First Modification]
FIG. 18 is a perspective view showing a rear end portion of the conveyance motor 210 of the copying machine according to the first modification. In the first modification, a transparent plastic material having optical transparency is used as the material of the holding table 218 of the transport motor 210. In such a configuration, the holding base 218 made of a transparent plastic material transmits light well, thereby reducing a shadow area on the back side of the circuit board 216. Thereby, the visibility of the electrode terminal 219 at the time of soldering work and the electrode pad 216c which is the electrode part for soldering can be improved, and workability of soldering can be improved.

[Second Modification]
FIG. 19 is a schematic configuration diagram showing the image forming unit 1 of the copying machine according to the second modification. The image forming unit 1 includes a paper feed cassette 42 and a conveyance roller pair 46. The motor driving device for driving the conveying roller pair 46 has the same configuration as the motor driving device for driving the conveying roller pair of the sheet supply device 40 of the copying machine according to the embodiment.

[Third Modification]
FIG. 20 is a schematic configuration diagram showing a copying machine according to a third modification. This copier has only one black image forming unit 3 as an image forming unit. Then, when the recording sheet is passed through the transfer nip formed by contact between the photosensitive member of the image forming unit 3 and the transfer roller, the toner image on the photosensitive member is transferred to the recording sheet. A sheet supply device 40 that supplies a recording sheet to the image forming unit 1 has the same configuration as that of the embodiment.

What has been described above is merely an example, and the present invention has a specific effect for each of the following modes.
[Aspect A]
Aspect A includes a case containing a coil and a magnet, a disk (for example, a code wheel 211a) fixed to a motor shaft (for example, a motor shaft 213) protruding from the case, and movement in the rotational direction of the disk. A circuit board (for example, circuit board 216) on which rotation detecting means for detection is mounted, a conductive member (for example, electrode terminal 219) protruding from the case, and the circuit board fixed to the outer surface of the case Holding means (for example, a holding base 218) that holds the wiring board at a position between the disk and the outer surface, and the wiring board is arranged with the surface opposite to the wiring forming surface facing the disk. In a motor in which the conductive member is soldered to a soldering conductive portion (for example, electrode pad 216c) provided on the formation surface, the disk fixed to the motor shaft is attached to the disk. Of the entire circular surface facing the substrate non-facing region that is a region that does not face the circuit board in the motor axial direction, thereby covering the substrate non-facing region to cover the circuit board in the motor axial direction. A covering member (for example, a non-holding portion 218b) that is invisible from the position on the wiring forming surface side is provided.

[Aspect B]
Aspect B is that in aspect A, the holding means is provided with a through-hole (for example, through-hole 218c) that penetrates the conductive member and leads to the circuit board, and the covering member is formed integrally with the holding means. It is characterized by. In such a configuration, by passing the conductive member through the through-hole, the periphery of the conductive member is covered with the holding means, and the non-substrate-facing region of the disk is covered with the covering member by the cover member formed integrally with the holding means. it can.

[Aspect C]
Aspect C includes a receiving portion (for example, receiving portion 218e) that receives the wiring formation surface of the circuit board and a contact portion that contacts the surface of the circuit board opposite to the wiring formation surface in the aspect A or B. (For example, a contact hook 218g) and a biasing claw (for example, a biasing claw 218d) for biasing the circuit board from the wiring forming surface side toward the contact portion are provided in the holding means. It is what. In such a configuration, as described above, it is possible to prevent a decrease in rotational speed detection accuracy due to holding the circuit board in an oblique posture.

[Aspect D]
Aspect D is characterized in that, in any one of Aspects A to C, a plastic material having optical transparency is used as the material of the holding means. In this configuration, as already described, the visibility of the conductive member and the conductive portion for soldering when performing the soldering operation can be improved, and the soldering workability can be improved.

200: Motor control circuit (control means)
210: Transport motor (motor)
211a: Code wheel (disc)
211b: Optical sensor (rotation detection means)
213: Motor shaft 216: Circuit board 218: Holding stand 218b: Non-holding place (covering member)
218c: Through-hole 218d: Energizing claw 218e: Receiving part 218g: Abutment rod (abutment part)
219: Electrode terminal (conductive member)

JP 2006-129692 A

Claims (6)

A case containing a coil or magnet,
A disk fixed to the motor shaft protruding from the case;
A circuit board on which rotation detection means for detecting movement in the rotation direction of the disk is mounted;
A conductive member protruding from the case;
Holding means for holding the circuit board at a position between the disk and the outer surface in a state of being fixed to the outer surface of the case;
In the motor in which the conductive member is soldered to the conductive portion for soldering provided on the wiring forming surface, with the surface opposite to the wiring forming surface of the circuit board facing the disk,
Out of the entire area of the circular surface of the disk fixed to the motor shaft, the substrate non-facing region is covered with the substrate non-facing region by facing the substrate non-facing region that is a region not facing the circuit board in the motor axial direction. Provide a cover member that is invisible from the position on the wiring forming surface side of the circuit board in the motor axial direction,
Providing the holding means with a through-hole that penetrates the conductive member and leads to the circuit board;
The motor is characterized in that the covering member is integrally formed with the holding means. The motor of claim 1,
A receiving portion for receiving the wiring formation surface of the circuit board, a contact portion that contacts the surface of the circuit board opposite to the wiring formation surface, and the circuit board from the wiring formation surface side to the contact portion. A motor characterized in that an energizing claw that energizes the holding means is provided on the holding means. The motor according to claim 1 or 2,
A motor using a plastic material having optical transparency as a material of the holding means. A motor including a case containing a coil and a magnet, a disk fixed to a motor shaft, and a circuit board on which rotation detection means for detecting movement in the rotation direction of the disk is mounted, and control for controlling driving of the motor A motor drive device comprising:
A motor driving apparatus using the motor according to claim 1 as the motor. Sheet conveyance comprising: a sheet conveyance member that conveys a sheet member pressed against its endlessly moving surface along with the endless movement of the surface; and motor driving means that drives a motor that is a driving source of the sheet conveyance member In the device
A sheet conveying apparatus using the motor driving apparatus according to claim 4 as the motor driving means. In an image forming apparatus comprising: a sheet conveying device that conveys a recording sheet as a sheet member; and an image forming unit that forms an image on the recording sheet.
Wherein a sheet conveying apparatus, an image forming apparatus characterized by using the sheet conveying apparatus according to claim 5.

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