JP6489438B2 - Driving device and image forming apparatus - Google Patents

Description

  The present invention relates to a drive device and an image forming apparatus.

  In an image forming apparatus in a copying machine, a printer, a facsimile machine, or a complex machine thereof, many driving units are provided for an image forming operation, and are used for operations of a photoconductor and a transfer belt.

  In the image forming apparatus described in Patent Document 1, a photoconductor gear provided on a rotating shaft of a photoconductor and a photoconductor driving gear having a rotating shaft held by a holding member of a driving device are meshed to serve as a driving source. A driving force is transmitted from the driving motor to the photosensitive member through the photosensitive member driving gear and the photosensitive member gear.

  The applicant of the present application has developed a drive device in which a damping plate is mounted on a drive bracket to which a drive motor and a drive transmission member are mounted in order to suppress vibrations of the drive device itself and suppress noise. In this drive device, the holding portion that holds the vibration member that vibrates during driving is configured at least by a drive bracket and a damping plate, which are two members that are partially connected. Thereby, the vibration which propagates from the said holding | maintenance part and a holding | maintenance part can be reduced, and the damping effect and noise reduction effect in the whole drive device can be acquired.

  In the drive device, the drive motor is attached to the drive bracket via a motor board which is a control board. A motor is attached to the surface of the motor board opposite to the drive bracket side, and a connector into which a harness for transmitting a control signal is inserted is provided. Here, when the harness is inserted into the connector of the motor board, the motor board may be damaged because the motor board warps to the drive bracket side. Therefore, in the drive device, a cut-and-bend portion that is cut and bent toward the motor board side is provided at a position facing the connector of the drive bracket, and a through-hole is provided so that the cut-and-bend portion does not interfere with the vibration damping plate. Is opened. And the front-end | tip of the said cut-and-bend part which protruded from the said through-hole is abutted on the surface on the opposite side to the side in which the connector of the motor board was provided. As a result, the cutting and bending portion functions as a cradle for receiving the motor board, and prevents the motor board from being damaged by suppressing the motor board from warping toward the drive bracket when the harness is inserted into the connector.

  However, if the cut and bent portion is provided in the drive bracket, a hole that is slightly larger than the cut and bent portion is formed in the drive bracket due to processing, and the gear meshing sound is likely to leak from the hole, leading to noise deterioration. There was a problem that.

  In order to solve the above-described problems, the present invention provides a drive including a drive motor, a drive transmission member that transmits a driving force from the drive motor to a driven transmission member, and a holding member that holds at least the drive motor. The apparatus further includes a vibration damping member that is superimposed on the holding member and partially connected to the holding member between the drive motor and the holding member, and the holding member is cut and bent toward the drive motor side. A through-hole is formed in the vibration damping member so as not to interfere with the cut-bend portion, and a hole formed in the holding member by providing the cut-bend portion. The through hole is smaller than the above.

  As described above, according to the present invention, it is possible to make it difficult to leak sound from the hole formed in the holding member and to reduce noise by providing the cut and bent portion.

1 is a schematic cross-sectional view of an image forming drive module according to the present embodiment. 1 is a schematic configuration diagram of a printer according to an embodiment. Expansion explanatory drawing of a process unit. The perspective view of the image formation drive module which drives an image formation system unit. FIG. 3 is a schematic perspective view of a drive bracket to which a photosensitive drum gear and a damping plate are attached. (A) A perspective view of an image forming drive module at a stage before the bending portion provided on the drive bracket is bent toward the motor board side; (b) the cutting and bending portion provided on the drive bracket is bent toward the motor board side; The perspective view of the image formation drive module of the state normally used. (A) The figure which showed only the drive bracket provided with the cutting and bending part and the hole, (b) The figure which showed the state which piled up the damping board on the drive bracket. The figure which showed an example of the image formation drive module of a comparative example. Schematic of the image formation drive module which concerns on a modification. The figure explaining the positional relationship of the connector provided in each motor board | substrate.

  Hereinafter, an embodiment of an electrophotographic printer 100 will be described as an image forming apparatus to which the present invention is applied. First, a basic configuration of the printer 100 according to the present embodiment will be described. FIG. 2 is a schematic configuration diagram of the printer 100 according to the present embodiment. The printer 100 includes four process units 26K, 26C, 26M, and 26Y for forming black, cyan, magenta, and yellow (hereinafter referred to as K, C, M, and Y) toner images. These use different colors of K, C, M, and Y toners as image forming substances, but otherwise have the same configuration and are replaced when the lifetime is reached.

  FIG. 3 is an enlarged explanatory view of one of the four process units 26K, 26C, 26M, and 26Y. Since the four process units 26K, 26C, 26M, and 26Y are the same except that the color of the toner to be used is different, the subscripts (K, C, M, and Y) indicating the color of the toner to be used are omitted in FIG. doing. As shown in FIG. 3, the process unit 26 includes a drum-shaped photosensitive drum 24 as a latent image carrier, a photosensitive member cleaning device 83, a static eliminator and a charging device 25, and a developing unit 23. And. The process unit 26 as an image forming unit can be attached to and detached from the main body of the printer 100 so that consumable parts can be replaced at a time.

  The charging device 25 uniformly charges the surface of the photosensitive drum 24 that is driven to rotate clockwise in the drawing by the driving unit. The uniformly charged surface of the photosensitive drum 24 is exposed and scanned by the laser beam L emitted from the optical writing unit 27 and carries an electrostatic latent image for each color. This electrostatic latent image is developed into a toner image by the developing unit 23 using toner. Then, primary transfer is performed on the intermediate transfer belt 22.

  The photoconductor cleaning device 83 removes transfer residual toner adhering to the surface of the photoconductor drum 24 after the primary transfer process. The static eliminator neutralizes residual charges on the photosensitive drum 24 after cleaning. By this charge removal, the surface of the photosensitive drum 24 is initialized and prepared for the next image formation.

  The developing unit 23 includes a vertically long hopper portion 86 that stores toner as a developer, and a developing portion 87. An agitator 88 that is rotated by driving means, a toner supply roller 80 as a developer supplying member that is rotated and driven by driving means below the vertical direction, and the like are disposed in a hopper 86 serving as a developer containing portion. Has been. The toner in the hopper 86 moves toward the toner supply roller 80 by its own weight while being agitated by the rotational drive of the agitator 88. The toner supply roller 80 has a metal cored bar and a roller part made of foamed resin or the like coated on the surface of the metal core. The toner accumulated on the lower side of the hopper 86 is applied to the surface of the roller part. Rotate while adhering.

  In the developing unit 87 of the developing unit 23, a developing roller 81 that rotates while being in contact with the photosensitive drum 24 and the toner supply roller 80, a thinning blade 82 whose tip is in contact with the surface thereof, and the like are disposed. ing. The toner attached to the toner supply roller 80 in the hopper 86 is supplied to the surface of the development roller 81 at a contact portion between the development roller 81 and the toner supply roller 80. When the supplied toner passes through the contact position between the developing roller 81 and the thinning blade 82 as the developing roller 81 rotates, the layer thickness on the surface of the developing roller 81 is regulated. Then, the toner after the regulation of the layer thickness adheres to the electrostatic latent image on the surface of the photosensitive drum 24 in the developing area which is a contact portion between the developing roller 81 and the photosensitive drum 24. By this adhesion, the electrostatic latent image is developed into a toner image.

  Such toner images are formed by the process units 26K, 26C, 26M, and 26Y, and the toner images of the respective colors are formed on the respective photosensitive drums 24 of the process units 26K, 26C, 26M, and 26Y. .

  As shown in FIG. 2, an optical writing unit 27 is disposed above the four process units 26K, 26C, 26M, and 26Y in the vertical direction. The optical writing unit 27 as a latent image writing device optically scans the respective photosensitive drums 24 in the four process units 26K, 26C, 26M, and 26Y by laser light L emitted from a laser diode based on image information. To do. By this optical scanning, an electrostatic latent image for each color is formed on the photosensitive drum 24. In such a configuration, the optical writing unit 27 and the four process units 26K, 26C, 26M, and 26Y make K, C, M, and Y visible images of different colors on the four photosensitive drums 24, respectively. It functions as an image forming means for forming a toner image.

  The optical writing unit 27 irradiates the photosensitive drum 24 through a plurality of optical lenses and mirrors while polarizing the laser light L emitted from the light source by a polygon mirror rotated by a polygon motor in the main scanning direction. is there. As the optical writing unit 27, an optical writing unit that performs optical writing with LED light emitted from a plurality of LEDs of the LED array may be employed.

  Below the four process units 26K, 26C, 26M, and 26Y, a transfer unit 75 is disposed as a belt device that moves the endless intermediate transfer belt 22 endlessly in a counterclockwise direction while stretching. Has been. In addition to the intermediate transfer belt 22, the transfer unit 75 includes a driving roller 76, a tension roller 20, four primary transfer rollers 74K, 74C, 74M, and 74Y, a secondary transfer roller 21, a belt cleaning device 71, a cleaning backup roller 72, and the like. It has.

  The intermediate transfer belt 22, which is a belt member and a transfer belt, is stretched by a driving roller 76, a tension roller 20, a cleaning backup roller 72, and four primary transfer rollers 74K, 74C, 74M, and 74Y disposed inside the loop. It is built. Then, it is moved endlessly in the same direction by the rotational force of the driving roller 76 that is driven to rotate counterclockwise in the drawing by the driving means.

  The four primary transfer rollers 74K, 74C, 74M, and 74Y sandwich the intermediate transfer belt 22 that is endlessly moved in this manner between the photosensitive drums 24K, 24C, 24M, and 24Y. By this sandwiching, four primary transfer nips for K, C, M, and Y where the front surface of the intermediate transfer belt 22 and the photosensitive drums 24K, 24C, 24M, and 24Y abut are formed.

  A primary transfer bias is applied to the primary transfer rollers 74K, 74C, 74M, and 74Y by a transfer bias power source. As a result, a transfer electric field is formed between the electrostatic latent images on the photosensitive drums 24K, 24C, 24M, and 24Y and the primary transfer rollers 74K, 74C, 74M, and 74Y. Instead of the primary transfer roller 74, a transfer charger or a transfer brush may be employed.

  The Y color toner image formed on the surface of the photosensitive drum 24Y of the process unit 26Y enters the above-described primary transfer nip for Y as the photosensitive drum 24Y rotates. In the primary transfer nip for Y, the Y-color toner image is primarily transferred from the photosensitive drum 24Y onto the intermediate transfer belt 22 by the action of the transfer electric field and nip pressure. The intermediate transfer belt 22 onto which the Y-color toner image has been primarily transferred in this way passes over the primary transfer nips for M, C, and K along with the endless movement of the intermediate transfer belt 22 on the photosensitive drums 24M, 24C, and 24K. The M, C, and K color toner images are sequentially superimposed on the Y color toner image and are primarily transferred. A four-color toner image is formed on the intermediate transfer belt 22 by the primary transfer of the superposition.

  The secondary transfer roller 21 of the transfer unit 75 is disposed outside the loop of the intermediate transfer belt 22 and sandwiches the intermediate transfer belt 22 between the tension roller 20 inside the loop. By this sandwiching, a secondary transfer nip where the front surface of the intermediate transfer belt 22 and the secondary transfer roller 21 abut is formed. A secondary transfer bias is applied to the secondary transfer roller 21 by a transfer bias power source. By this application, a secondary transfer electric field is formed between the secondary transfer roller 21 and the tension roller 20 connected to the ground.

  Below the transfer unit 75 in the vertical direction, a paper feed cassette 41 that accommodates a plurality of recording papers stacked in a bundle is slidably attached to the housing of the printer 100. In the paper feed cassette 41, a paper feed roller 42 is brought into contact with the top recording paper in a bundle of paper, and the recording paper is rotated counterclockwise in the figure at a predetermined timing. Send it out toward the paper feed path.

  Near the end of the paper feed path, a registration roller pair 43 composed of two registration rollers is disposed. The registration roller pair 43 stops the rotation of both rollers as soon as a recording sheet serving as a recording member fed from the sheet feeding cassette 41 is sandwiched between the rollers. Then, rotation driving is restarted at a timing at which the sandwiched recording paper can be synchronized with the four-color toner image on the intermediate transfer belt 22 in the above-described secondary transfer nip, and the recording paper is sent out toward the secondary transfer nip.

  The four-color toner image on the intermediate transfer belt 22 that is in close contact with the recording paper at the secondary transfer nip is secondarily transferred onto the recording paper under the influence of the secondary transfer electric field and nip pressure, and combined with the white color of the recording paper. A full color toner image is obtained. The recording paper having the full-color toner image formed on the surface in this way is separated from the secondary transfer roller 21 and the intermediate transfer belt 22 by the curvature when passing through the secondary transfer nip. Then, the toner is sent to a fixing device 40 as a fixing unit via a post-transfer conveyance path.

  The fixing device 40 is provided with a fixing roller 45 including a heat source 45a such as a halogen lamp, and a pressure roller 47 that rotates while contacting the fixing roller 45 with a predetermined pressure. A fixing nip is formed by the pressure roller 47. The recording paper fed into the fixing device 40 is sandwiched between the fixing nips such that the unfixed toner image carrying surface is in close contact with the fixing roller 45. Then, the toner in the toner image is softened by the influence of heating and pressurization, and the full-color image is fixed.

  When the single-sided print mode is set, the recording paper discharged from the fixing device 40 is discharged to the outside as it is. Then, it is stacked on a stack portion constituted by the upper surface of the upper cover 56 of the housing.

  Note that the untransferred toner that has not been transferred to the recording paper adheres to the intermediate transfer belt 22 after passing through the secondary transfer nip. This is cleaned from the belt surface by a belt cleaning device 71 in contact with the front surface of the intermediate transfer belt 22. A cleaning backup roller 72 disposed inside the loop of the intermediate transfer belt 22 backs up the cleaning of the belt by the belt cleaning device 71 from the inside of the loop.

  Here, a schematic diagram of the layout of the image forming drive module 101 for driving the image forming system unit is shown. The image forming system unit is each unit of the photoconductor unit 30, the developing unit 23, and the transfer unit 75, and is a portion that creates a toner image on recording paper. The image forming drive module 101 mainly drives the photosensitive drum 24, the developing roller 81, the driving roller 76, and the like, which are driving objects.

  FIG. 4 is a perspective view of the image forming drive module 101. The black developing motor 1c drives the black photosensitive drum 24K, the black developing unit 23K, and the driving roller 76 of the transfer unit 75. The color drum motor 1b drives the color photosensitive drums 24C, 24M, and 24Y, and the color development motor 1a drives the color development units 23C, 23M, and 23Y. Note that the color developing motor 1a, the color drum motor 1b, and the black developing motor 1c are also simply referred to as a motor 1 hereinafter unless otherwise distinguished.

  The image forming drive module 101 includes a drive bracket 105 that is a first holding member. The drive bracket 105 is provided with a motor positioning hole in which the color developing motor 1a, the color drum motor 1b, and the black developing motor 1c are positioned by inlay. In addition, a damping plate 106 which is a second holding member and a damping member is superimposed on the driving bracket 105 and partially screwed to the driving bracket 105 on the driving bracket 105. The color developing motor 1a, the color drum motor 1b, and the black developing motor 1c are fixed to the driving bracket 105 by screws while being positioned in the motor positioning holes of the driving bracket 105.

  Further, the drive bracket 105 has a main reference hole 131 and a sub reference hole 132 into which the assembly jig can be inserted in order to position the image forming drive module 101 in the printer 100 at both ends of the drive bracket in the longitudinal direction. Each is open. When assembling the image forming drive module, the main reference hole 131 and the sub reference hole 132 are used as a reference.

  As shown in FIG. 4, a main reference hole avoiding hole 121 and a sub reference hole avoiding hole 122 that are larger than these are formed in portions of the damping plate 106 facing the main reference hole 131 and the sub reference hole 132. And are opened. As a result, the damping plate 106 is avoided without contacting the assembly jig inserted into the main reference hole 131 and the sub reference hole 132 of the drive bracket 105. On the other hand, a plurality of cylindrical protrusions 108 a for positioning the photosensitive drum gear 107 with respect to the drive bracket 105 are provided on the side surface of the drive bracket 105 facing the vibration damping plate 106. The damping plate 106 is positioned with reference to a part.

  FIG. 5 is a schematic perspective view of the drive bracket 105 to which the photosensitive drum gear 107 and the damping plate 106 are attached. When the photosensitive drum shaft 107a is inserted into the shaft hole 108 of the drive bracket 105, the outer peripheral portion of the positioning portion 109 provided at one end of the photosensitive drum shaft 107a, and the inner periphery of each of the shaft hole 108 and the protruding portion 108a. The part makes surface contact. Thus, positioning in the direction orthogonal to the axial direction of the photosensitive drum shaft 107a with respect to the drive bracket 105 is performed.

  In addition, the inner peripheral portion of the photosensitive drum shaft hole 126Y, which is the main reference positioning hole provided in the vibration damping plate 106, and the outer peripheral portion of the protrusion 108aY provided in the drive bracket 105 are in surface contact with each other. The main reference positioning of the damping plate 106 with respect to the drive bracket 105 is performed. In addition, the inner peripheral portion of the photosensitive drum shaft hole 126K, which is a secondary reference positioning hole provided in the vibration damping plate 106, and the outer peripheral portion of the protrusion 108aK provided in the drive bracket 105 are in surface contact with each other. The sub-standard positioning of the damping plate 106 with respect to the drive bracket 105 is performed. The damping plate 106 contacts only the driving bracket 105 and does not contact the photosensitive drum gear 107 and the photosensitive drum shaft 107a.

  FIG. 1 is a schematic cross-sectional view of an image forming drive module 101 according to the present embodiment. As shown in FIG. 1, a motor 1 as a drive source is held by a drive bracket 105a. The motor 1 is connected to a drive object 5 through a motor gear 2, a gear 3, and a drive shaft 4. The driving object 5 is the photosensitive drum 32, the developing roller 81, and the like. When the driving object 5 is the photosensitive drum 32, the gear 3 corresponds to the photosensitive drum gear 107, and the drive shaft 4 is photosensitive. It corresponds to the body drum shaft 107a. A drive bracket 105b and a damping plate 106b are provided on the side of the image forming drive module 101 on the side where the driving object 5 that is opposite to the side on which the motor 1 is held is disposed. The drive shaft 4 is rotatably held by the drive bracket 105 a and the drive bracket 105 b, and plays a role of transmitting the driving force of the motor 1 transmitted from the gear 3 via the motor gear 2 to the driving object 5. The drive bracket 105a and the drive bracket 105b are connected by two studs 7. The driving bracket 105a and the damping plate 106a, and the driving bracket 105b and the damping plate 106b are overlapped with each other, and are partially coupled by structural means such as a claw or a fastening member such as a screw 8. .

  By partially fastening the drive bracket 105a and the damping plate 106a, and the drive bracket 105b and the damping plate 106b with screws or the like, the vibration of the drive bracket 105 and the damping plate 106 do not vibrate synchronously. Behaves like canceling each other's vibrations. With this effect, the vibration of the entire drive bracket 105 can be reduced, and noise generated from the drive bracket 105 is reduced. Further, the motor 1 is attached to the damping plate 106a and the gear 3 is held by the drive bracket 105a, so that vibrations generated by the motor 1 and the gear 3 are transmitted to the damping plate 106a and the drive bracket 105a, respectively. And behaves to cancel each other. Furthermore, by changing the positions of the gear 3 and the screw 8, the vibration mode of the drive bracket 105a is changed, and an optimum configuration can be obtained in which vibration is canceled with the vibration damping plate 106a. The same applies even if the gear 3 is an idler gear.

  The motor 1 is attached to the drive bracket 105a via a motor board 9 which is a control board. The motor 1 is attached to the surface of the motor board 9 opposite to the drive bracket 105a side, and a connector 12 into which a harness for transmitting a control signal is inserted is provided. Further, a portion of the drive bracket 105a facing the connector 12 is provided with a cut and bent portion 10 cut and bent toward the motor substrate 9, so that the cut and bent portion 10 does not interfere with the damping plate 106a. A through hole 13 is opened.

  When a harness is inserted into the connector 12 provided on the surface opposite to the drive bracket side of the motor board 9, the motor board 9 may bend back and bend to the drive bracket side, and the motor board 9 may be damaged. Therefore, the tip of the cut and bent portion 10 provided on the drive bracket 105a is abutted against the surface of the motor board 9 opposite to the side where the connector is provided so that the motor board 9 does not bend toward the drive bracket 105a. The cut and bent portion 10 is used as a cradle for the motor substrate 9. Further, by providing the driving bracket 105a with the cut and bent portion 10, a hole 11 larger than the size of the cut and bent portion 10 is formed in the drive bracket 105, so that the engagement sound between the motor gear 2 and the gear 3 leaks from there. Easy to come out. On the other hand, like the image forming drive module 101 of the present embodiment, the through hole 13 provided in the damping plate 106a so as not to interfere with the cut and bent portion 10 is smaller than the hole 11 formed in the drive bracket 105a. By doing so, the hole 11 can be covered with the damping plate 106a. As a result, the gear meshing sound leaking from the hole 11 can be cut off at the portion of the hole 11 covered with the damping plate 106a, and the gear meshing sound leaking can be reduced, and the noise can be reduced accordingly. .

  FIG. 6A is a perspective view of the imaging drive module 101 at the previous stage where the cut and bent portion 10 provided on the drive bracket 105a is bent toward the motor substrate 9 side (motor 1 side). FIG. 6B is a perspective view of the image forming drive module 101 in a state in which the cut and bent portion 10 provided on the drive bracket 105a is bent toward the motor substrate 9 side (motor 1 side) and is normally used.

  When the cut and bent portion 10 is provided in the drive bracket 105a, first, a hole must be made around the cut and bent portion 10 as shown in FIG. After opening the hole 11, it must be bent like the cut and bent portion 10 in FIG. 6 (b). For this purpose, the hole is slightly larger than the cut and bent portion 10 (from the edge of the cut and bent portion 10). It is necessary to leave a gap of at least about 2 [mm].

  That is, when the cut and bent portion 10 is provided in the drive bracket 105, a hole having a size corresponding to at least the cut and bent portion 10 is formed in the drive bracket 105. As a result, a hole 11 that is a slightly larger size of the opening is formed. On the other hand, after the cut and bent portion 10 is formed in the drive bracket 105, the hole 11 itself formed in the drive bracket 105 has no particular function, and the size of the opening of the hole 11 becomes larger than necessary, so that sound leaks. It becomes easy. In addition, since the cut and bent portion 10 is used as a cradle for the connector 12 of the motor board 9, the hole 11 is inevitably formed in the vicinity of the motor of the drive bracket 105a. In the vicinity of the motor, a gear meshing sound having a particularly high contribution ratio among driving sounds is generated. Therefore, it is desirable to close the hole 11 as much as possible by the damping plate 106 attached to the driving bracket 105 in an overlapping manner.

  FIG. 7 is a diagram for explaining the closing of the hole with the damping plate 106. FIG. 7A shows only the drive bracket 105 provided with the cut and bent portion 10 and the hole 11. FIG. 7B is a diagram showing a state in which the damping plate 106 is overlaid on the drive bracket 105. As shown in FIG. 7B, the damping plate 106 is formed with a through hole 13 having an opening large enough to prevent the damping plate 106 and the cut and bent portion 10 from interfering with each other. The through-hole 13 is a small opening as compared with the hole 11 formed in. Thereby, the hole 11 can be closed as much as possible by the damping plate 106, and the gear meshing sound leaking from the hole 11 can be reduced.

  FIG. 8 is a diagram illustrating an example of the image forming drive module 101 of the comparative example. Also in the image forming drive module 101 of the comparative example shown in FIG. 8, the motor 1 as a drive source is held by the drive bracket 105a. The motor 1 is connected to a drive object 5 via a motor gear 2, a gear 3, and a drive shaft 4. A drive bracket 105b and a damping plate 106b are provided on the side of the image forming drive module 101 on the side where the driving object 5 that is opposite to the side on which the motor 1 is held is disposed. The drive shaft 4 is rotatably held by the drive bracket 105 a and the drive bracket 105 b, and plays a role of transmitting the driving force of the motor 1 transmitted from the gear 3 via the motor gear 2 to the driving object 5. The drive bracket 105a and the drive bracket 105b are connected by two studs 7. The driving bracket 105a and the damping plate 106a, and the driving bracket 105b and the damping plate 106b are overlapped with each other, and are partially coupled by structural means such as a claw or a fastening member such as a screw 8. .

  The motor 1 is attached to the drive bracket 105a via a motor board 9 which is a control board. The motor 1 is attached to the surface of the motor board 9 opposite to the drive bracket 105a side, and a connector 12 into which a harness for transmitting a control signal is inserted is provided. In the image forming drive module 101 of the comparative example, a cut-and-bend portion 14 cut and bent toward the motor substrate 9 side is provided at a position facing the connector 12 of the vibration-damping plate 106a. Has a hole 15 formed by providing a cut and bent portion 14.

  In the case of the configuration of the image forming drive module 101 shown in FIG. 8, since there is no hole in the vicinity of the connector 12 provided on the motor board 9 of the drive bracket 105a, the gear meshing sound is blocked by the drive bracket 105a and leaks out. There is nothing. However, the portion of the drive bracket 105a that faces the hole 15 formed in the vibration damping plate 106a is a portion that does not come into contact with the vibration damping plate 106a. Therefore, in that portion, the vibration damping of the drive bracket 105a by the vibration damping plate 106a is performed. The effect cannot be obtained.

  Here, when the damping plate 106a is attached to the drive bracket 105a, the vibration state of the entire image forming drive module 101 changes compared to the case where the damping plate 106a is not attached to the drive bracket 105a. Since the vibrations are canceled out, basically, the configuration in which the vibration control plate 106 is provided on the drive bracket 105a can achieve lower vibration and lower noise. However, if the resonance point in the configuration in which the damping plate 106 is attached to the drive bracket 105a coincides with the drive frequency, it is difficult to obtain a vibration reduction effect. In such a case, it may be possible to take measures such as changing to a configuration in which the damping plate 106a is not attached to the drive bracket 105a. However, when the vibration control plate 106a is eliminated in the image forming drive module 101 shown in FIG. 8, the shape of the drive bracket 105 is separately changed instead of the cut and bent portion 14 provided on the vibration control plate 106 as a connector cradle. Thus, a connector cradle must be formed on the drive bracket 105.

  On the other hand, in the case of the configuration of the image forming drive module 101 according to the present embodiment shown in FIG. The configuration can be changed simply by eliminating the damping plate 106a.

  FIG. 9 is a schematic diagram of an image forming drive module 101 according to a modification. In the image forming drive module 101 shown in FIG. 1, the gear 3 that meshes with the motor gear 2 of the motor 1 is an external gear. On the other hand, in the image forming drive module 101 according to the modification shown in FIG. 9, the gear 3 that meshes with the motor gear 2 is an internal gear. As a result, the meshing portion between the motor gear 2 and the first gear is covered with respect to the direction of the hole 11, and the sound leakage is less likely to occur. Further, since the meshing with the internal gear overlaps and the meshing rate is high, the meshing noise between the motor gear 2 and the first gear is reduced.

  The positional relationship between the connectors 12a, 12b, and 12c provided on the motor boards 9a, 9b, and 9c will be described with reference to FIGS. 10 (a) and 10 (b). In an image forming apparatus, particularly in a color machine, a plurality of motors are required to drive each unit, and the plurality of motors may be arranged together in one drive bracket 105a as shown in FIG. Many. In that case, since the number of motor boards 9 is provided as many as the number of motors 1, the number of motors 1 is set in one drive bracket 105a corresponding to the connectors 12a, 12b, and 12c provided on the motor boards 9a, 9b, and 9c. Only the cut and bent portion 10 is provided. In FIG. 10A, the distance between the connectors 12a and 12b is close. For this reason, the strength in the vicinity of the connectors 12a and 12b in the drive bracket 105a and the damping plate 106a may be locally reduced, or the assemblability when the harness is inserted into the connectors 12a and 12b may be reduced. On the other hand, in FIG. 10B, the connectors 12a, 12b, and 12c are arranged at a distance of about one sheet of the motor board 9. Thereby, the strength fall of drive bracket 105a and the assembly fall of harness can be controlled.

What was demonstrated above is an example, and there exists an effect peculiar for every following aspect.
(Aspect A)
A drive motor such as the motor 1, a drive transmission member such as a gear 3 that transmits a driving force from the drive motor to a driven transmission member such as the drive object 5, and a drive bracket 105 a that holds at least the drive motor. In a drive device such as the image forming drive module 101 provided with a holding member, a damping plate 106a or the like that is superimposed on the holding member and partially connected to the holding member between the drive motor and the holding member The holding member is provided with a cut and bent portion such as a cut and bent portion 10 cut and bent toward the drive motor, and the vibration control member is opened so as not to interfere with the cut and bent portion. A through hole such as the formed through hole 13 is provided, and the through hole is smaller than the hole such as the hole 11 formed in the holding member by providing the cut and bent portion.
In (Aspect A), as described in the above embodiment, the through hole opened in the vibration damping member is smaller than the hole formed in the holding member by providing the cut and bent portion. The hole can be covered with the damping member. Thereby, in the part covered with the said damping member of the said hole, the sound which leaks from the said hole is interrupted | blocked, and it becomes difficult to leak a sound from the said hole, and noise can be reduced by that much.
(Aspect B)
In (Aspect A), the drive transmission member includes an internal gear that meshes with a motor gear provided on an output shaft of the drive motor. According to this, as described in the above embodiment, the gear meshing sound is reduced, and the gear meshing sound can be made more difficult to leak from the hole formed in the holding member.
(Aspect C)
In (Aspect B), in the configuration in which the drive motor rotates in the clockwise direction, the motor gear is a helical gear that is to the right in the twist direction, and in the configuration in which the drive motor rotates in the counterclockwise direction, The helical gear is such that the motor gear is to the left in the twisting direction. According to this, as described in the above embodiment, the thrust force works so as to draw the internal gear toward the motor side. That is, the meshing position between the motor and the internal gear is more reliably covered.
(Aspect D)
In any one of (Aspect A) to (Aspect C), the holding member and the damping member are different in thickness. According to this, as described in the above embodiment, it is possible to obtain an optimum configuration that cancels the vibration of the holding member.
(Aspect E)
In an image forming apparatus such as the printer 100 that includes an image forming unit that forms an image such as the process unit 26 and a driving unit that transmits driving force to a driven transmission member and drives the driven member, the driving unit (Aspect A) The driving device according to any one of (Aspect D) is used. According to this, as described in the above embodiment, the provision of the cut and bent portion makes it difficult for sound to leak from the hole formed in the holding member, and noise can be reduced.

DESCRIPTION OF SYMBOLS 1 Motor 1a Color development motor 1b Color drum motor 1c Black development motor 2 Motor gear 3 Gear 4 Drive shaft 5 Drive object 7 Stud 8 Screw 9 Motor board 10 Cutting and bending part 11 Hole 12 Connector 12a Connector 12b Connector 12c Connector 13 Through hole 14 Cutting / bending portion 15 Hole 20 Tension roller 21 Secondary transfer roller 22 Intermediate transfer belt 23 Developing unit 24 Photosensitive drum 25 Charging device 26 Process unit 27 Optical writing unit 30 Photosensitive unit 40 Fixing device 41 Paper feed cassette 42 Paper feed roller 43 Registration roller pair 45 Fixing roller 45a Heat source 47 Pressure roller 56 Upper cover 71 Belt cleaning device 72 Cleaning backup roller 74 Primary transfer roller 75 Transfer unit 76 Driving roller 80 Toner supply roller 81 Developing roller 82 Thinning blade 83 Photoconductor cleaning device 86 Hopper unit 87 Developing unit 88 Agitator 100 Printer 101 Image driving module 105 Driving bracket 105a Driving bracket 105b Driving bracket 106 Damping plate 106a Vibration plate 106b Damping plate 107 Photoconductor drum gear 107a Photoconductor drum shaft 108a Projection portion 108 Shaft hole 109 Positioning portion 121 Main reference hole avoidance hole 122 Secondary reference hole avoidance hole 126 Photoconductor drum shaft hole 131 Main reference hole 132 Substandard Hole

JP 2014-111983 A

Claims (5)

A drive motor;
A drive transmission member that transmits a driving force from the drive motor to a driven transmission member;
In a drive device comprising at least a holding member for holding the drive motor,
A damping member that is superimposed on the holding member and partially connected to the holding member between the drive motor and the holding member;
The holding member is provided with a cut and bent portion that is cut and bent toward the drive motor.
The vibration damping member is provided with a through hole opened so as not to interfere with the cut and bent portion,
The drive device according to claim 1, wherein the through hole is smaller than the hole formed in the holding member by providing the cut and bent portion. The drive device according to claim 1,
The drive device having an internal gear meshing with a motor gear provided on an output shaft of the drive motor as the drive transmission member. The drive device according to claim 2, wherein
In the configuration in which the drive motor rotates in the clockwise direction, the toothed gear is such that the motor gear is twisted right, and in the configuration in which the drive motor is rotated counterclockwise, the motor gear is twisted left A drive device characterized by being a helical gear. The drive device according to any one of claims 1 to 3,
The drive device, wherein the holding member and the damping member have different thicknesses. An image forming means for forming an image;
In an image forming apparatus provided with a driving unit that transmits a driving force to a driven transmission member to drive the member,
An image forming apparatus using the driving device according to claim 1 as the driving unit.

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