WO2021235340A1 - Image forming device - Google Patents

Image forming device Download PDF

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Publication number
WO2021235340A1
WO2021235340A1 PCT/JP2021/018375 JP2021018375W WO2021235340A1 WO 2021235340 A1 WO2021235340 A1 WO 2021235340A1 JP 2021018375 W JP2021018375 W JP 2021018375W WO 2021235340 A1 WO2021235340 A1 WO 2021235340A1
Authority
WO
WIPO (PCT)
Prior art keywords
gear
clutch
image forming
power
cleaning
Prior art date
Application number
PCT/JP2021/018375
Other languages
French (fr)
Japanese (ja)
Inventor
未都 大須賀
Original Assignee
ブラザー工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ブラザー工業株式会社 filed Critical ブラザー工業株式会社
Publication of WO2021235340A1 publication Critical patent/WO2021235340A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H1/00—Toothed gearings for conveying rotary motion
    • F16H1/02—Toothed gearings for conveying rotary motion without gears having orbital motion
    • F16H1/04—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members
    • F16H1/06—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with parallel axes
    • F16H1/08—Toothed gearings for conveying rotary motion without gears having orbital motion involving only two intermeshing members with parallel axes the members having helical, herringbone, or like teeth
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/02—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
    • F16H3/08—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts
    • F16H3/10—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts with one or more one-way clutches as an essential feature
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements

Definitions

  • This disclosure relates to an image forming apparatus.
  • the image forming apparatus includes a photosensitive drum, a transfer roller, a motor, and a drum gear train.
  • the transfer roller transfers the toner on the photosensitive drum to the sheet.
  • the drum gear train transmits power from the motor to the photosensitive drum (see Patent Document 1 below).
  • An object of the present disclosure is to provide an image forming apparatus capable of cleaning a transfer roller.
  • the image forming apparatus of the present disclosure includes a photosensitive drum, a transfer roller, a cleaning member, a motor, a drum gear train, and a cleaning gear train.
  • the transfer roller transfers the toner on the photosensitive drum to the sheet.
  • the cleaning member cleans the transfer roller.
  • the drum gear train transfers power from the motor to the photosensitive drum.
  • the drum gear train has a first gear and a second gear. The first gear rotates by receiving power from a motor. The second gear transmits power to the photosensitive drum.
  • the cleaning gear train transfers power from the first gear to the cleaning member.
  • the cleaning gear train has a one-way clutch.
  • the transfer roller can be cleaned by the cleaning member.
  • the cleaning gear train can receive the power from the motor from the drum gear train and transmit it to the cleaning member.
  • the cleaning member can be driven by using the motor for rotating the photosensitive drum.
  • the cleaning gear train has a one-way clutch, it is possible to cancel the transmission of power to the cleaning member when it is not necessary to drive the cleaning member.
  • the cleaning member may be a cleaning roller.
  • the cleaning roller comes into contact with the surface of the transfer roller.
  • the cleaning roller may not rotate and the transfer roller may rotate.
  • the transfer roller can be cleaned by utilizing the rotation of the transfer roller during printing.
  • the cleaning roller may change the portion in contact with the transfer roller by rotating by receiving power from the cleaning gear train.
  • the transfer roller can be cleaned at the part that newly contacts the transfer roller by changing the portion that contacts the transfer roller.
  • the image forming apparatus may further include a control device and a first clutch.
  • the first clutch can be switched between the first transmission state and the first transmission release state. When the first clutch is in the first transmission state, the first clutch can transmit power from the first gear to the second gear. When the first clutch is in the first transmission release state, the first clutch releases the transmission of power from the first gear to the second gear.
  • the one-way clutch does not transmit power to the cleaning member.
  • the one-way clutch transmits power to the cleaning member.
  • the control device puts the first clutch in the first transmission release state and rotates the first gear in the second rotation direction from the motor to the photosensitive drum.
  • the power may be transmitted from the motor to the cleaning member in a state where the power transmission to the motor is released.
  • the cleaning member can be rotated with the photosensitive drum stopped when printing is not performed.
  • the first gear may be rotatable with respect to the first axis.
  • the second gear may be rotatable about the first axis.
  • the image forming apparatus may further include a shaft.
  • the shaft extends along the first axis.
  • the first gear, the second gear and the first clutch may be supported by the shaft.
  • the first clutch may be located between the first gear and the second gear.
  • the first gear, the second gear, and the first clutch are arranged along the first axis.
  • the first gear, the second gear, and the first clutch have a smaller space in the direction intersecting the first axis than when the first gear, the second gear, and the first clutch are arranged in the direction intersecting the first axis.
  • the clutch can be placed.
  • the first clutch can be provided in the drum gear row while suppressing the increase in size.
  • the first clutch may be an electromagnetic clutch.
  • the image forming apparatus may further include a developing roller and a developing gear train.
  • the developing gear train receives power from the motor via the drum gear train and transmits it to the developing rollers.
  • the developing gear train may be connected to the first gear.
  • the developing gear train may have a second clutch.
  • the second clutch can be switched between the second transmission state and the second transmission release state. When the second clutch is in the second transmission state, the second clutch can transmit power to the developing roller. When the second clutch is in the second transmission release state, the second clutch releases the transmission of power to the developing roller.
  • the rotation of the developing roller can be stopped at a desired timing by switching the second clutch from the second transmission state to the second transmission release state.
  • the second clutch may be an electromagnetic clutch.
  • the transfer roller can be cleaned.
  • FIG. 1 is a schematic configuration diagram of an image forming apparatus.
  • FIG. 2 is a perspective view of the photosensitive drum and the gear unit.
  • FIG. 3 is a block diagram showing the transmission of power from the motor to the photosensitive drum, the developing device, and the fixing device.
  • FIG. 4 is an exploded perspective view of the gear unit shown in FIG.
  • FIG. 5 is a cross-sectional view of the gear unit shown in FIG.
  • FIG. 6 is an exploded perspective view of the gear unit shown in FIG. 2, which is an exploded perspective view seen from an angle different from that of FIG.
  • FIG. 7 is a flowchart for explaining the control of the image forming apparatus.
  • the image forming apparatus 1 includes a housing 2, a sheet accommodating portion 3, a photosensitive drum 4, a charging device 5, an exposure device 6, a developing device 7, a transfer roller 8, and a fixing device 9.
  • the housing 2 houses the sheet accommodating portion 3, the photosensitive drum 4, the charging device 5, the exposure device 6, the developing device 7, the transfer roller 8, and the fixing device 9.
  • the seat accommodating portion 3 accommodates the seat S.
  • the sheet S in the sheet accommodating portion 3 is supplied to the photosensitive drum 4.
  • the seat accommodating portion 3 may be a seat cassette.
  • Photosensitive drum 4 The photosensitive drum 4 is rotatable about the drum shaft A1.
  • the drum shaft A1 extends in the first direction.
  • the photosensitive drum 4 has a drum main body 41 and a drum gear 42.
  • the drum body 41 extends in the first direction along the drum axis A1.
  • the drum body 41 has a cylindrical shape.
  • the drum gear 42 is attached to the end of the drum body 41 in the first direction.
  • the drum gear 42 can rotate together with the drum body 41.
  • the charging device 5 charges the photosensitive drum 4.
  • the charging device 5 is a scorotron type charging device.
  • the charging device 5 may be a charging roller.
  • Exposure device 6 exposes the photosensitive drum 4 charged by the charging device 5. As a result, the exposure apparatus 6 forms an electrostatic latent image on the photosensitive drum 4.
  • the exposure apparatus 6 is a laser scan unit.
  • the exposure apparatus 6 may be an LED print head having an LED array.
  • the developing device 7 has a developing housing 71 and a developing roller 72.
  • the image forming apparatus 1 includes a developing roller 72.
  • the developing housing 71 accommodates toner.
  • the developing roller 72 supplies the toner in the developing housing 71 to the photosensitive drum 4.
  • the developing roller 72 is rotatable about the developing shaft A2.
  • the development axis A2 extends in the first direction.
  • the developing roller 72 extends in the first direction along the developing axis A2.
  • the developing roller 72 has a cylindrical shape. The developing roller 72 comes into contact with the photosensitive drum 4.
  • Transfer roller 8 transfers the toner on the photosensitive drum 4 to the sheet S.
  • the transfer roller 8 is rotatable about the transfer shaft A3.
  • the transfer axis A3 extends in the first direction.
  • the transfer roller 8 extends in the first direction along the transfer axis A3.
  • the transfer roller 8 has a cylindrical shape. The transfer roller 8 comes into contact with the photosensitive drum 4.
  • Fixing device 9 The fixing device 9 fixes the toner on the sheet S.
  • the fixing device 9 is a heat roller fixing method.
  • the sheet S that has passed through the fixing device 9 is discharged to the upper surface of the housing 2.
  • the image forming apparatus 1 includes a motor 11, a drum gear array 12, a developing gear array 13, a cleaning member 14, a cleaning gear array 15, and a control device 16.
  • the motor 11 has an output shaft (not shown) and an output gear (not shown).
  • the output gear is attached to the output shaft.
  • the output gear can rotate with the output shaft.
  • the motor 11 is switched between forward rotation and reverse rotation by the control device 16.
  • Drum gear row 12 The drum gear train 12 is connected to the output gear of the motor 11.
  • the drum gear train 12 transmits power from the motor 11 to the photosensitive drum 4.
  • the drum gear train 12 has a gear unit 120.
  • the gear unit 120 has a shaft 121, a first gear 122, a second gear 123, a first clutch 124, a first coupling 125, and a second coupling 126.
  • the image forming apparatus 1 has a shaft 121.
  • the drum gear train 12 has a first gear 122, a second gear 123, a first clutch 124, a first coupling 125, and a second coupling 126.
  • the shaft 121 extends along the first axis A11.
  • the first axis A11 extends in the first direction.
  • the shaft 121 has a first support portion 121A, a second support portion 121B, a third support portion 121C, and a flange 121D.
  • the first support portion 121A supports the first gear 122.
  • the first support portion 121A is located at one end of the shaft 121 in the first direction.
  • the first support portion 121A extends in the first direction.
  • the first support portion 121A has a cylindrical shape.
  • the first support portion 121A has a circular shape when viewed from the first direction.
  • the second support portion 121B supports the second gear 123.
  • the second support portion 121B is located away from the first support portion 121A in the first direction.
  • the second support portion 121B is located at the other end of the shaft 121 in the first direction.
  • the second support portion 121B extends in the first direction.
  • the second support portion 121B has a D-shape when viewed from the first direction.
  • the second support portion 121B has an arc surface S1 and a plane S2.
  • the arcuate surface S1 extends in the rotational direction of the first gear 122.
  • the plane S2 extends in the radial direction of the first gear 122.
  • the plane S2 extends in a direction intersecting the rotation direction of the first gear 122.
  • the third support portion 121C supports the first clutch 124.
  • the third support portion 121C is located between the first support portion 121A and the second support portion 121B in the first direction.
  • the third support portion 121C extends in the first direction.
  • the third support portion 121C has a D-shape when viewed from the first direction.
  • the third support portion 121C has an arcuate surface S11 and a flat surface S12.
  • the arcuate surface S11 extends in the rotational direction of the first gear 122.
  • the plane S12 extends in the radial direction of the first gear 122.
  • the plane S12 extends in a direction intersecting the rotation direction of the first gear 122.
  • the flange 121D is located between the first support portion 121A and the third support portion 121C in the first direction.
  • the flange 121D is located on the peripheral surface of the shaft 121.
  • the flange 121D extends from the peripheral surface of the shaft 121.
  • the flange 121D may be a member different from the shaft 121.
  • the flange 121D may be attached to the peripheral surface of the shaft 121.
  • the flange 121D has a disk shape. With the first gear 122 attached to the shaft 121, the flange 121D faces one end E1 of the first gear 121 in the first direction. With the first gear 122 attached to the shaft 121, the flange 121D is slightly distant from the first gear 122 in the first direction.
  • the first gear 122 receives power from the motor 11.
  • the first gear 122 receives power from the motor 11 and rotates.
  • the first gear 122 rotates in the first rotation direction.
  • the first gear 122 rotates in the second rotation direction.
  • the second rotation direction is opposite to the first rotation direction.
  • the first gear 122 may be connected to the output gear of the motor 11 via an idle gear (not shown).
  • the first gear 122 is a helical gear.
  • the first gear 122 is rotatable with respect to the first axis A11.
  • the first gear 122 has one end E1 and the other end E2 in the first direction.
  • the other end E2 is located between the one end E1 and the first clutch 124 in the first direction.
  • the first gear 122 has a hole 122A.
  • the hole 122A is located at the center of the first gear 122 in the radial direction of the first gear 122.
  • the hole 122A has a circular shape.
  • the first support portion 121A of the shaft 121 fits in the hole 122A.
  • the first gear 122 is supported by the first support portion 121A of the shaft 121.
  • the first gear 122 is rotatable with respect to the first support portion 121A of the shaft 121.
  • the second gear 123 is located away from the first gear 122 in the first direction.
  • the second gear 123 is a helical gear.
  • the second gear 123 meshes with the drum gear 42.
  • the second gear 123 transmits power to the photosensitive drum 4.
  • the second gear 123 is rotatable with respect to the first axis A11.
  • the second gear 123 has a hole 123A.
  • the hole 123A is located at the center of the second gear 123 in the radial direction of the second gear 123.
  • the hole 123A has a D-shape.
  • the second gear 123 has an arcuate surface S21 and a flat surface S22.
  • the arcuate surface S21 is the inner surface of the hole 123A.
  • the arcuate surface S21 extends in the rotational direction of the first gear 122.
  • the plane S22 is the inner surface of the hole 123A.
  • the plane S22 extends in the radial direction of the first gear 122.
  • the plane S22 extends in a direction intersecting the rotation direction of the first gear 122.
  • the second support portion 121B of the shaft 121 fits in the hole 123A.
  • the second gear 123 is supported by the second support portion 121B of the shaft 121.
  • the arcuate surface S1 of the second support portion 121B faces the arcuate surface S21 of the second gear 123.
  • the plane S2 of the second support portion 121B faces the plane S22 of the second gear 123.
  • the second gear 123 can rotate together with the shaft 121.
  • the first clutch 124 is located between the first gear 122 and the second gear 123 in the first direction.
  • the first clutch 124 is located away from the first gear 122 in the first direction.
  • the first clutch 124 is located away from the second gear 123 in the first direction.
  • the first clutch 124 can be switched between the first transmission state and the first transmission release state.
  • the first clutch 124 can transmit power from the first gear 122 to the second gear 123.
  • the first clutch 124 releases the transmission of power from the first gear 122 to the second gear 123.
  • the first clutch 124 is an electromagnetic clutch.
  • the electromagnetic clutch has a coil, a rotor, and an armature. With the coil energized, the armature can rotate with the rotor.
  • the first clutch 124 is in the first transmission state while the coil is energized.
  • the armature can rotate independently of the rotor when the coil is not energized.
  • the first clutch 124 is in the first transmission release state when the coil is not energized.
  • the first clutch 124 further has a hub 124A.
  • the hub 124A connects the rotor and the shaft 121.
  • the hub 124A is rotatable with the rotor.
  • the hub 124A has a hole 124B.
  • the hole 124B has a D-shape.
  • the hub 124A has an arcuate surface S31 and a flat surface S32.
  • the arcuate surface S31 is the inner surface of the hole 124B.
  • the arcuate surface S31 extends in the rotational direction of the first gear 122.
  • the plane S32 is the inner surface of the hole 124B.
  • the plane S32 extends in the radial direction of the first gear 122.
  • the plane S32 extends in a direction intersecting the rotation direction of the first gear 122.
  • the third support portion 121C of the shaft 121 fits in the hole 124B.
  • the first clutch 124 is supported by the third support portion 121C of the shaft 121.
  • the arcuate surface S11 of the third support portion 121C faces the arcuate surface S31 of the hub 124A.
  • the plane S12 of the third support portion 121C faces the plane S32 of the hub 124A.
  • the shaft 121 can rotate together with the hub 124A and the rotor.
  • the first coupling 125 is located at the other end E2 of the first gear 122 in the first direction. In this embodiment, the first coupling 125 is part of the first gear 122.
  • the first coupling 125 is a member different from the first gear 122 and may be attached to the first gear 122.
  • the first coupling 125 is rotatable together with the first gear 122.
  • the first coupling 125 has a groove 125A and a groove 125B.
  • the groove 125A extends in the radial direction of the first gear 122.
  • the direction in which the groove 125A extends is defined as the second direction.
  • the second direction intersects the rotation direction of the first gear 122.
  • the groove 125A is located away from the hole 122A in the second direction.
  • the groove 125B is located away from the groove 125A in the second direction.
  • the groove 125B is located away from the hole 122A in the second direction.
  • the groove 125B is located on the opposite side of the groove 125A with respect to the hole 122A in the second direction.
  • the groove 125B is located on the opposite side of the groove 125A with respect to the first axis A11 in the second direction.
  • the groove 125B extends in the second direction. In other words, the groove 125B extends in the same direction as the groove 125A.
  • Second coupling 126 As shown in FIG. 6, the second coupling 126 is located between the first clutch 124 and the first gear 122 in the first direction. The second coupling 126 is attached to the armature of the first clutch 124. The second coupling 126 is rotatable with the armature of the first clutch 124.
  • the second coupling 126 fits into the first coupling 125 (see FIG. 4).
  • the second coupling 126 is rotatable together with the first coupling 125 with the second coupling 126 fitted in the first coupling 125.
  • the armature of the first clutch 124 is connected to the first gear 122 that receives power from the motor 11 by the first coupling 125 and the second coupling 126.
  • the armature is directly connected to the first gear 122, the armature is pulled to the first gear 122, or the armature is pushed to the first gear 122, from the first gear 122 to the armature.
  • a force in one direction may be applied.
  • the thrust force of the first gear 122 causes the first gear 122 to move from the first gear 122 to the armature in the first direction. The force is added to.
  • the armature is connected to the first gear 122 by the first coupling 125 and the second coupling 126.
  • the first coupling 125 and the second coupling 126 are sandwiched between the first gear 122 and the first clutch 124.
  • the first coupling 125 and the second coupling 126 can move in the first direction with each other, it is possible to suppress the force applied to the armature from the first gear 122 in the first direction. That is, it is possible to suppress the application of a force other than torque from the first gear 122 to the armature. As a result, deterioration of the first clutch 124 can be suppressed, and the first clutch 124 can be made to last longer.
  • the second coupling 126 has a protrusion 126A and a protrusion 126B.
  • the protrusion 126A extends in the second direction.
  • the protrusion 126A is located away from the hole 124B in the second direction. With the second coupling 126 fitted in the first coupling 125, the protrusion 126A fits into the groove 125A (see FIG. 4) of the first coupling 125.
  • the protrusion 126B is located away from the protrusion 126A in the second direction.
  • the protrusion 126B is located away from the hole 124B in the second direction.
  • the protrusion 126B is located on the opposite side of the protrusion 126A with respect to the hole 124B in the second direction.
  • the protrusion 126B is located on the opposite side of the protrusion 126A with respect to the first axis A11 in the second direction.
  • the protrusion 126B extends in the second direction. In other words, the protrusion 126B extends in the same direction as the protrusion 126A.
  • the protrusion 126A fits into the groove 125A of the first coupling 125 and the protrusion 126B fits into the groove 125B of the first coupling 125 so that the second coupling 126 can rotate with the first coupling 125.
  • the second coupling 126 With the second coupling 126 fitted in the first coupling 125, the second coupling 126 can move with respect to the first coupling 125 in the first direction in which the first axis A11 extends. As a result, while the second coupling 126 is rotating together with the first coupling 125, the second coupling 126 moves with respect to the first coupling 125 in the first direction in which the first axis A11 extends. It is possible. That is, torque can be transmitted between the first coupling 125 and the second coupling 126 while allowing the first coupling 125 and the second coupling 126 to deviate from each other in the first direction.
  • the second coupling 126 can move with respect to the first coupling 125 in the second direction in which the protrusion 126A and the protrusion 126B extend.
  • the second direction is the movement direction of the second coupling 126 with respect to the first coupling 125 in the radial direction of the first gear 122.
  • the second coupling 126 can move in the second direction with respect to the first coupling 125 while the second coupling 126 is rotating together with the first coupling 125.
  • the second coupling 126 With the second coupling 126 rotating with the first coupling 125, the second coupling 126 is movable relative to the first coupling 125 in the radial direction of the first gear 122. be. That is, torque can be transmitted between the first coupling 125 and the second coupling 126 while allowing the first coupling 125 and the second coupling 126 to deviate from each other in the second direction.
  • the first gear 122 is between the inner surface of the hole 122A of the first gear 122 and the peripheral surface of the first support portion 121A. In the radial direction of the gear 122, there is a slight gap that allows the first support portion 121A to fit into the hole 122A. Therefore, while the first gear 122 is rotating, the rotation axis of the first gear 122 is slightly displaced in the radial direction of the first gear 122.
  • the second coupling 126 is movable in the radial direction of the first gear 122 with respect to the first coupling 125, the diameter of the first gear 122 is changed from the first gear 122 to the armature. It is possible to suppress the application of force in the direction. That is, it is possible to suppress the application of a force other than torque from the first gear 122 to the armature.
  • the developing gear train 13 receives the power from the motor 11 via the drum gear train 12 and transmits the power to the developing device 7.
  • the developing gear train 13 receives the power from the motor 11 via the drum gear train 12 and transmits the power to the developing roller 72.
  • the developing gear train 13 transmits power from the first gear 122 to the developing device 7.
  • the developing gear train 13 has a second clutch 131.
  • the second clutch 131 is located between the first gear 122 and the developing device 7.
  • the second clutch 131 is an electromagnetic clutch.
  • the second clutch 131 can be switched between the second transmission state and the second transmission release state.
  • the second clutch 131 can transmit power from the first gear 122 to the developing device 7.
  • the second clutch 131 can transmit power to the developing roller 72.
  • the second clutch 131 releases the power transmission from the first gear 122 to the developing device 7.
  • the second clutch 131 releases the power transmission to the developing roller 72.
  • the cleaning member 14 cleans the transfer roller 8.
  • the cleaning member 14 is a cleaning roller.
  • the cleaning member 14 comes into contact with the surface of the transfer roller 8.
  • the cleaning member 14 cleans the surface of the transfer roller 8 while the transfer roller 8 is rotating.
  • the cleaning gear train 15 receives the power from the motor 11 via the drum gear train 12 and transmits the power to the cleaning member 14. Specifically, the cleaning gear row 15 transmits power from the first gear 122 to the cleaning member 14.
  • the cleaning gear row 15 has a one-way clutch 151.
  • the one-way clutch 151 is located between the first gear 122 and the cleaning member 14. When the first gear 122 rotates in the first rotation direction, the one-way clutch 151 does not transmit the power to the cleaning member 14. Therefore, when the first gear 122 rotates in the first rotation direction, the cleaning member 14 does not rotate. On the other hand, when the first gear 122 rotates in the second rotation direction, the one-way clutch 151 transmits power to the cleaning member 14. Therefore, when the first gear 122 rotates in the second rotation direction, the cleaning member 14 rotates.
  • Control device 16 As shown by the broken line in FIG. 3, the control device 16 is electrically connected to the motor 11, the first clutch 124, and the second clutch 131. The control device 16 controls the motor 11, the first clutch 124, and the second clutch 131.
  • the control apparatus 16 sets the first clutch 124 in the first transmission state (S1) and the second clutch 131 in the second transmission state (S2). , The motor 11 is rotated in the forward direction (S3).
  • the power from the motor 11 is transmitted to the photosensitive drum 4 by the drum gear train 12.
  • the photosensitive drum 4 rotates.
  • the transfer roller 8 rotates together with the photosensitive drum 4.
  • the transfer roller 8 rotates by receiving power from the drum gear 42 (see FIG. 2).
  • the power from the motor 11 is transmitted to the developing device 7 by the developing gear train 13.
  • the developing roller 72 rotates.
  • the first gear 122 rotates in the first rotation direction due to the forward rotation of the motor 11. Therefore, the one-way clutch 151 of the cleaning gear row 15 does not transmit the power to the cleaning member 14. As a result, the cleaning member 14 does not rotate.
  • the transfer roller 8 rotates with respect to the non-rotating cleaning member 14 while the cleaning member 14 is in contact with the transfer roller 8, the surface of the transfer roller 8 rubs against the cleaning member 14. As a result, the surface of the transfer roller 8 is cleaned by the cleaning member 14. In other words, when the cleaning member 14 cleans the surface of the transfer roller 8, the cleaning member 14 does not rotate, but the transfer roller 8 rotates.
  • the cleaning member 14 since the cleaning member 14 does not rotate, the portion of the surface of the cleaning member 14 that comes into contact with the transfer roller 8 is concentrated and soiled.
  • control device 16 is second when the number of printed sheets S (cumulative number of printed sheets) reaches a predetermined number (threshold) (S5: YES) after the print job is completed (S4: YES).
  • the clutch 131 is set to the second transmission release state (S6), the first clutch 124 is set to the first transmission release state (S7), and the motor 11 is rotated in the reverse direction (S8).
  • the first gear 122 rotates in the second rotation direction due to the reverse rotation of the motor 11. That is, when the number of printed sheets S reaches a predetermined number, the control device 16 puts the first clutch 124 in the first transmission release state and rotates the first gear 122 in the second rotation direction.
  • the one-way clutch 151 of the cleaning gear row 15 transmits power to the cleaning member 14.
  • the control device 16 transmits the power from the motor 11 to the cleaning member 14 in a state where the power transmission from the motor 11 to the photosensitive drum 4 is released. Then, the cleaning member 14 rotates.
  • control device 16 stops the motor 11 after a predetermined time has elapsed since the motor 11 was rotated in the reverse direction (S10).
  • the portion of the surface of the cleaning member 14 that comes into contact with the transfer roller 8 changes. That is, the cleaning member 14 changes the portion in contact with the transfer roller 8 by rotating under the power of the cleaning gear train 15.
  • the control device 16 is a motor.
  • the motor 11 is stopped without rotating the 11 in the reverse direction (S10). 4. Action Effect (1) According to the image forming apparatus 1, as shown in FIG. 1, the transfer roller 8 can be cleaned by the cleaning member 14.
  • the cleaning gear row 15 can receive the power from the motor 11 from the drum gear row 12 and transmit the power to the cleaning member 14.
  • the cleaning member 14 can be driven by using the motor 11 for rotating the photosensitive drum 4.
  • the cleaning gear row 15 has the one-way clutch 151, it is possible to cancel the transmission of the power to the cleaning member 14 when it is not necessary to drive the cleaning member 14.
  • the cleaning member 14 can be driven as needed with a simple configuration.
  • the transfer roller 8 can be cleaned by utilizing the rotation of the transfer roller 8 during printing.
  • the cleaning member 14 changes a portion in contact with the transfer roller 8 by being rotated by receiving power from the cleaning gear row 15.
  • the part in contact with the transfer roller 8 can be changed, and the transfer roller 8 can be cleaned at the part newly in contact with the transfer roller 8.
  • control device 16 transmits the power from the motor 11 to the cleaning member 14 in a state where the power transmission from the motor 11 to the photosensitive drum 4 is released.
  • the cleaning member 14 can be rotated with the photosensitive drum 4 stopped.
  • the first clutch 124 is located between the first gear 122 and the second gear 123.
  • first gear 122, the second gear 123, and the first clutch 124 are arranged along the first axis A11.
  • the first gear 122, the second gear 123, and the first clutch 124 are lined up in the direction intersecting the first axis A11, the first gear 122, The second gear 123 and the first clutch 124 can be arranged.
  • the first clutch 124 can be provided in the drum gear row 12 while suppressing the increase in size.
  • the developing gear train 13 has a second clutch 131.
  • the second clutch 131 can transmit power to the developing roller 72.
  • the second clutch 131 is in the second transmission release state, the second clutch 131 releases the transmission of power to the developing roller 72.
  • the rotation of the developing roller 72 can be stopped at a desired timing.
  • the cleaning member 14 may be a cleaning belt.
  • the motor 11 does not have to rotate in the reverse direction.
  • a switching mechanism for switching the rotation direction of the first gear 122 may be provided between the motor 11 and the first gear 122.
  • the gear unit 120 does not have to have a shaft 121 that collectively supports the first gear 122, the second gear 123, and the first clutch 124.
  • Each of the first gear 122, the second gear 123, and the first clutch 124 may be independently supported by the housing 2.
  • the first clutch 124 and the second clutch 131 may be mechanical clutches.

Abstract

Provided is an image forming device that can clean a transfer roller. The image forming device 1 comprises a photosensitive drum 4, a transfer roller 8, a cleaning member 14, a motor 11, a drum gear train 12, and a cleaning gear train 15. The transfer roller 8 transfers, to a sheet S, a toner on the photosensitive drum 4. The cleaning member 14 cleans the transfer roller 8. The drum gear train 12 transmits power from the motor 11 to the photosensitive drum 4. The drum gear train 12 has a first gear 122 and a second gear 123. The first gear 122 rotates by receiving power from the motor 11. The second gear 123 transmits power to the photosensitive drum 4. The cleaning gear train 15 transmits power from the first gear 122 to the cleaning member 14. The cleaning gear train 15 has a one-way clutch 151.

Description

画像形成装置Image forming device
　本開示は、画像形成装置に関する。  This disclosure relates to an image forming apparatus. The
　従来、画像形成装置は、感光ドラムと、転写ローラと、モータと、ドラムギア列とを備える。転写ローラは、感光ドラム上のトナーをシートに転写する。ドラムギア列は、モータから感光ドラムに動力を伝える（下記特許文献１参照）。 Conventionally, the image forming apparatus includes a photosensitive drum, a transfer roller, a motor, and a drum gear train. The transfer roller transfers the toner on the photosensitive drum to the sheet. The drum gear train transmits power from the motor to the photosensitive drum (see Patent Document 1 below).
特開２００２－２６８５０３号公報Japanese Unexamined Patent Publication No. 2002-268503
　上記した特許文献１に記載されるような画像形成装置において、転写ローラをクリーニングしたい場合がある。 In the image forming apparatus as described in Patent Document 1 described above, there are cases where it is desired to clean the transfer roller.
　本開示の目的は、転写ローラをクリーニングできる画像形成装置を提供することにある。 An object of the present disclosure is to provide an image forming apparatus capable of cleaning a transfer roller.
　（１）本開示の画像形成装置は、感光ドラムと、転写ローラと、クリーニング部材と、モータと、ドラムギア列と、クリーニングギア列とを備える。転写ローラは、感光ドラム上のトナーをシートに転写する。クリーニング部材は、転写ローラをクリーニングする。ドラムギア列は、モータから感光ドラムに動力を伝える。ドラムギア列は、第１ギアと、第２ギアとを有する。第１ギアは、モータからの動力を受けて回転する。第２ギアは、感光ドラムに動力を伝える。クリーニングギア列は、第１ギアからクリーニング部材に動力を伝える。クリーニングギア列は、ワンウェイクラッチを有する。 (1) The image forming apparatus of the present disclosure includes a photosensitive drum, a transfer roller, a cleaning member, a motor, a drum gear train, and a cleaning gear train. The transfer roller transfers the toner on the photosensitive drum to the sheet. The cleaning member cleans the transfer roller. The drum gear train transfers power from the motor to the photosensitive drum. The drum gear train has a first gear and a second gear. The first gear rotates by receiving power from a motor. The second gear transmits power to the photosensitive drum. The cleaning gear train transfers power from the first gear to the cleaning member. The cleaning gear train has a one-way clutch.
　このような構成によれば、クリーニング部材により、転写ローラをクリーニングできる。 According to such a configuration, the transfer roller can be cleaned by the cleaning member.
　また、クリーニングギア列は、モータからの動力を、ドラムギア列から受けて、クリーニング部材へ伝えることができる。 In addition, the cleaning gear train can receive the power from the motor from the drum gear train and transmit it to the cleaning member.
　そのため、感光ドラムを回転させるためのモータを利用して、クリーニング部材を駆動させることができる。 Therefore, the cleaning member can be driven by using the motor for rotating the photosensitive drum.
　また、クリーニングギア列がワンウェイクラッチを有しているため、クリーニング部材を駆動させる必要が無い場合には、クリーニング部材への動力の伝達を解除することもできる。 Further, since the cleaning gear train has a one-way clutch, it is possible to cancel the transmission of power to the cleaning member when it is not necessary to drive the cleaning member.
　これにより、簡易な構成で、必要に応じて、クリーニング部材を駆動させることができる。 This makes it possible to drive the cleaning member as needed with a simple configuration.
　（２）クリーニング部材は、クリーニングローラであってもよい。クリーニングローラは、転写ローラの表面と接触する。クリーニングローラが転写ローラの表面をクリーニングする場合、クリーニングローラは、回転しないで、転写ローラは、回転してもよい。 (2) The cleaning member may be a cleaning roller. The cleaning roller comes into contact with the surface of the transfer roller. When the cleaning roller cleans the surface of the transfer roller, the cleaning roller may not rotate and the transfer roller may rotate.
　このような構成によれば、印刷中に、転写ローラの回転を利用して転写ローラをクリーニングできる。 According to such a configuration, the transfer roller can be cleaned by utilizing the rotation of the transfer roller during printing.
　また、印刷中にクリーニングローラを回転させないことにより、印刷中にモータにかかる負荷が増大することを、抑制できる。 Further, by not rotating the cleaning roller during printing, it is possible to suppress an increase in the load applied to the motor during printing.
　（３）クリーニングローラは、クリーニングギア列から動力を受けて回転することによって、転写ローラに接触する部分を変えてもよい。 (3) The cleaning roller may change the portion in contact with the transfer roller by rotating by receiving power from the cleaning gear train.
　このような構成によれば、転写ローラに接触する部分を変えて、新しく転写ローラに接触する部分で、転写ローラをクリーニングできる。 According to such a configuration, the transfer roller can be cleaned at the part that newly contacts the transfer roller by changing the portion that contacts the transfer roller.
　（４）画像形成装置は、制御装置と、第１クラッチとを、さらに備えてもよい。第１クラッチは、第１伝達状態と、第１伝達解除状態に切り替え可能である。第１クラッチが第１伝達状態である場合、第１クラッチは、第１ギアから第２ギアに動力を伝達可能である。第１クラッチが第１伝達解除状態である場合、第１クラッチは、第１ギアから第２ギアへの動力の伝達を解除する。第１ギアが第１回転方向に回転する場合、ワンウェイクラッチは、クリーニング部材への動力を伝達しない。第１ギアが第１回転方向とは逆方向の第２回転方向に回転する場合、ワンウェイクラッチは、クリーニング部材への動力を伝達する。制御装置は、印刷したシートの枚数が所定の枚数に達した場合に、第１クラッチを第１伝達解除状態にし、かつ、第１ギアを第２回転方向に回転させることにより、モータから感光ドラムへの動力の伝達を解除した状態で、モータからクリーニング部材へ動力を伝達してもよい。 (4) The image forming apparatus may further include a control device and a first clutch. The first clutch can be switched between the first transmission state and the first transmission release state. When the first clutch is in the first transmission state, the first clutch can transmit power from the first gear to the second gear. When the first clutch is in the first transmission release state, the first clutch releases the transmission of power from the first gear to the second gear. When the first gear rotates in the first rotation direction, the one-way clutch does not transmit power to the cleaning member. When the first gear rotates in the second rotation direction opposite to the first rotation direction, the one-way clutch transmits power to the cleaning member. When the number of printed sheets reaches a predetermined number, the control device puts the first clutch in the first transmission release state and rotates the first gear in the second rotation direction from the motor to the photosensitive drum. The power may be transmitted from the motor to the cleaning member in a state where the power transmission to the motor is released.
　このような構成によれば、印刷していないときに、感光ドラムを止めた状態で、クリーニング部材を回転させることができる。 According to such a configuration, the cleaning member can be rotated with the photosensitive drum stopped when printing is not performed.
　（５）第１ギアは、第１軸について回転可能であってもよい。第２ギアは、第１軸について回転可能であってもよい。 (5) The first gear may be rotatable with respect to the first axis. The second gear may be rotatable about the first axis.
　（６）画像形成装置は、シャフトを、さらに備えてもよい。シャフトは、第１軸に沿って延びる。第１ギア、第２ギアおよび第１クラッチは、シャフトに支持されてもよい。 (6) The image forming apparatus may further include a shaft. The shaft extends along the first axis. The first gear, the second gear and the first clutch may be supported by the shaft.
　（７）第１クラッチは、第１ギアと第２ギアとの間に位置してもよい。 (7) The first clutch may be located between the first gear and the second gear.
　このような構成によれば、第１ギア、第２ギアおよび第１クラッチは、第１軸に沿って並ぶ。 According to such a configuration, the first gear, the second gear, and the first clutch are arranged along the first axis.
　そのため、第１ギア、第２ギアおよび第１クラッチが第１軸と交差する方向に並ぶ場合と比べて、第１軸と交差する方向における小さなスペースに、第１ギア、第２ギアおよび第１クラッチを配置できる。 Therefore, the first gear, the second gear, and the first clutch have a smaller space in the direction intersecting the first axis than when the first gear, the second gear, and the first clutch are arranged in the direction intersecting the first axis. The clutch can be placed.
　その結果、大型化を抑制しつつ、ドラムギア列に第１クラッチを設けることができる。 As a result, the first clutch can be provided in the drum gear row while suppressing the increase in size.
　（８）第１クラッチは、電磁クラッチであってもよい。 (8) The first clutch may be an electromagnetic clutch.
　（９）画像形成装置は、現像ローラと、現像ギア列とを、さらに備えてもよい。現像ギア列は、モータからの動力を、ドラムギア列を介して受けて、現像ローラに伝える。 (9) The image forming apparatus may further include a developing roller and a developing gear train. The developing gear train receives power from the motor via the drum gear train and transmits it to the developing rollers.
　（１０）現像ギア列は、第１ギアと接続されてもよい。 (10) The developing gear train may be connected to the first gear.
　（１１）現像ギア列は、第２クラッチを有してもよい。第２クラッチは、第２伝達状態と、第２伝達解除状態に切り替え可能である。第２クラッチが第２伝達状態である場合、第２クラッチは、現像ローラに動力を伝達可能である。第２クラッチが第２伝達解除状態である場合、第２クラッチは、現像ローラへの動力の伝達を解除する。 (11) The developing gear train may have a second clutch. The second clutch can be switched between the second transmission state and the second transmission release state. When the second clutch is in the second transmission state, the second clutch can transmit power to the developing roller. When the second clutch is in the second transmission release state, the second clutch releases the transmission of power to the developing roller.
　このような構成によれば、第２クラッチを第２伝達状態から第２伝達解除状態に切り替えることにより、現像ローラの回転を所望のタイミングで止めることができる。 According to such a configuration, the rotation of the developing roller can be stopped at a desired timing by switching the second clutch from the second transmission state to the second transmission release state.
　（１２）第２クラッチは、電磁クラッチであってもよい。 (12) The second clutch may be an electromagnetic clutch.
　本開示の画像形成装置によれば、転写ローラをクリーニングできる。 According to the image forming apparatus of the present disclosure, the transfer roller can be cleaned.
図１は、画像形成装置の概略構成図である。FIG. 1 is a schematic configuration diagram of an image forming apparatus. 図２は、感光ドラムおよびギアユニットの斜視図である。FIG. 2 is a perspective view of the photosensitive drum and the gear unit. 図３は、モータから感光ドラム、現像装置および定着装置への動力の伝達を示すブロック図である。FIG. 3 is a block diagram showing the transmission of power from the motor to the photosensitive drum, the developing device, and the fixing device. 図４は、図２に示すギアユニットの分解斜視図である。FIG. 4 is an exploded perspective view of the gear unit shown in FIG. 図５は、図２に示すギアユニットの断面図である。FIG. 5 is a cross-sectional view of the gear unit shown in FIG. 図６は、図２に示すギアユニットの分解斜視図であって、図４とは異なるアングルから見た分解斜視図である。FIG. 6 is an exploded perspective view of the gear unit shown in FIG. 2, which is an exploded perspective view seen from an angle different from that of FIG. 図７は、画像形成装置の制御を説明するためのフローチャートである。FIG. 7 is a flowchart for explaining the control of the image forming apparatus.
　１．画像形成装置１の概略
　図１および図２を参照して、画像形成装置１の概略について説明する。 1. 1. Schematic of the image forming apparatus 1 The outline of the image forming apparatus 1 will be described with reference to FIGS. 1 and 2.
　画像形成装置１は、筐体２と、シート収容部３と、感光ドラム４と、帯電装置５と、露光装置６と、現像装置７と、転写ローラ８と、定着装置９とを備える。 The image forming apparatus 1 includes a housing 2, a sheet accommodating portion 3, a photosensitive drum 4, a charging device 5, an exposure device 6, a developing device 7, a transfer roller 8, and a fixing device 9.
　１．１　筐体２
　筐体２は、シート収容部３と、感光ドラム４と、帯電装置５と、露光装置６と、現像装置７と、転写ローラ８と、定着装置９とを収容する。 1.1 Housing 2
The housing 2 houses the sheet accommodating portion 3, the photosensitive drum 4, the charging device 5, the exposure device 6, the developing device 7, the transfer roller 8, and the fixing device 9.
　１．２　シート収容部３
　シート収容部３は、シートＳを収容する。シート収容部３内のシートＳは、感光ドラム４に供給される。シート収容部３は、シートカセットであってもよい。 1.2 Seat housing 3
The seat accommodating portion 3 accommodates the seat S. The sheet S in the sheet accommodating portion 3 is supplied to the photosensitive drum 4. The seat accommodating portion 3 may be a seat cassette.
　１．３　感光ドラム４
　感光ドラム４は、ドラム軸Ａ１について回転可能である。ドラム軸Ａ１は、第１方向に延びる。 1.3 Photosensitive drum 4
The photosensitive drum 4 is rotatable about the drum shaft A1. The drum shaft A1 extends in the first direction.
　図２に示すように、感光ドラム４は、ドラム本体４１と、ドラムギア４２とを有する。 As shown in FIG. 2, the photosensitive drum 4 has a drum main body 41 and a drum gear 42.
　ドラム本体４１は、ドラム軸Ａ１に沿って第１方向に延びる。ドラム本体４１は、円筒形状を有する。 The drum body 41 extends in the first direction along the drum axis A1. The drum body 41 has a cylindrical shape.
　ドラムギア４２は、第１方向におけるドラム本体４１の端部に取り付けられる。ドラムギア４２は、ドラム本体４１とともに回転可能である。 The drum gear 42 is attached to the end of the drum body 41 in the first direction. The drum gear 42 can rotate together with the drum body 41.
　１．４　帯電装置５
　図１に示すように、帯電装置５は、感光ドラム４を帯電させる。本実施形態では、帯電装置５は、スコロトロン型の帯電器である。帯電装置５は、帯電ローラであってもよい。 1.4 Charging device 5
As shown in FIG. 1, the charging device 5 charges the photosensitive drum 4. In the present embodiment, the charging device 5 is a scorotron type charging device. The charging device 5 may be a charging roller.
　１．５　露光装置６
　露光装置６は、帯電装置５によって帯電された感光ドラム４を露光する。これにより、露光装置６は、感光ドラム４に静電潜像を形成する。本実施形態では、露光装置６は、レーザースキャンユニットである。露光装置６は、ＬＥＤアレイを有するＬＥＤプリントヘッドであってもよい。 1.5 Exposure device 6
The exposure device 6 exposes the photosensitive drum 4 charged by the charging device 5. As a result, the exposure apparatus 6 forms an electrostatic latent image on the photosensitive drum 4. In the present embodiment, the exposure apparatus 6 is a laser scan unit. The exposure apparatus 6 may be an LED print head having an LED array.
　１．６　現像装置７
　現像装置７は、現像筐体７１と、現像ローラ７２とを有する。言い換えると、画像形成装置１は、現像ローラ７２を備える。 1.6 Developer 7
The developing device 7 has a developing housing 71 and a developing roller 72. In other words, the image forming apparatus 1 includes a developing roller 72.
　現像筐体７１は、トナーを収容する。 The developing housing 71 accommodates toner.
　現像ローラ７２は、現像筐体７１内のトナーを、感光ドラム４に供給する。現像ローラ７２は、現像軸Ａ２について回転可能である。現像軸Ａ２は、第１方向に延びる。現像ローラ７２は、現像軸Ａ２に沿って、第１方向に延びる。現像ローラ７２は、円柱形状を有する。現像ローラ７２は、感光ドラム４と接触する。 The developing roller 72 supplies the toner in the developing housing 71 to the photosensitive drum 4. The developing roller 72 is rotatable about the developing shaft A2. The development axis A2 extends in the first direction. The developing roller 72 extends in the first direction along the developing axis A2. The developing roller 72 has a cylindrical shape. The developing roller 72 comes into contact with the photosensitive drum 4.
　１．７　転写ローラ８
　転写ローラ８は、感光ドラム４上のトナーを、シートＳに転写する。転写ローラ８は、転写軸Ａ３について回転可能である。転写軸Ａ３は、第１方向に延びる。転写ローラ８は、転写軸Ａ３に沿って、第１方向に延びる。転写ローラ８は、円柱形状を有する。転写ローラ８は、感光ドラム４と接触する。 1.7 Transfer roller 8
The transfer roller 8 transfers the toner on the photosensitive drum 4 to the sheet S. The transfer roller 8 is rotatable about the transfer shaft A3. The transfer axis A3 extends in the first direction. The transfer roller 8 extends in the first direction along the transfer axis A3. The transfer roller 8 has a cylindrical shape. The transfer roller 8 comes into contact with the photosensitive drum 4.
　１．８　定着装置９
　定着装置９は、シートＳにトナーを定着させる。本実施形態では、定着装置９は、ヒートローラ定着方式である。定着装置９を通ったシートＳは、筐体２の上面に排出される。 1.8 Fixing device 9
The fixing device 9 fixes the toner on the sheet S. In the present embodiment, the fixing device 9 is a heat roller fixing method. The sheet S that has passed through the fixing device 9 is discharged to the upper surface of the housing 2.
　２．画像形成装置１の詳細
　次に、図１から図７を参照して、画像形成装置１の詳細について説明する。 2. 2. Details of the Image Forming Device 1 Next, the details of the image forming apparatus 1 will be described with reference to FIGS. 1 to 7.
　図３に示すように、画像形成装置１は、モータ１１と、ドラムギア列１２と、現像ギア列１３と、クリーニング部材１４と、クリーニングギア列１５と、制御装置１６とを備える。 As shown in FIG. 3, the image forming apparatus 1 includes a motor 11, a drum gear array 12, a developing gear array 13, a cleaning member 14, a cleaning gear array 15, and a control device 16.
　２．１　モータ１１
　モータ１１は、図示しない出力シャフトと、図示しない出力ギアとを有する。出力ギアは、出力シャフトに取り付けられる。出力ギアは、出力シャフトとともに回転可能である。モータ１１は、制御装置１６により、正回転と、逆回転に切り替えられる。 2.1 Motor 11
The motor 11 has an output shaft (not shown) and an output gear (not shown). The output gear is attached to the output shaft. The output gear can rotate with the output shaft. The motor 11 is switched between forward rotation and reverse rotation by the control device 16.
　２．２　ドラムギア列１２
　ドラムギア列１２は、モータ１１の出力ギアと接続する。ドラムギア列１２は、モータ１１から感光ドラム４に動力を伝える。ドラムギア列１２は、ギアユニット１２０を有する。 2.2 Drum gear row 12
The drum gear train 12 is connected to the output gear of the motor 11. The drum gear train 12 transmits power from the motor 11 to the photosensitive drum 4. The drum gear train 12 has a gear unit 120.
　図４に示すように、ギアユニット１２０は、シャフト１２１と、第１ギア１２２と、第２ギア１２３と、第１クラッチ１２４と、第１カップリング１２５と、第２カップリング１２６とを有する。言い換えると、画像形成装置１は、シャフト１２１を有する。ドラムギア列１２は、第１ギア１２２と、第２ギア１２３と、第１クラッチ１２４と、第１カップリング１２５と、第２カップリング１２６とを有する。 As shown in FIG. 4, the gear unit 120 has a shaft 121, a first gear 122, a second gear 123, a first clutch 124, a first coupling 125, and a second coupling 126. In other words, the image forming apparatus 1 has a shaft 121. The drum gear train 12 has a first gear 122, a second gear 123, a first clutch 124, a first coupling 125, and a second coupling 126.
　２．２．１　シャフト１２１
　図４および図５に示すように、シャフト１２１は、第１軸Ａ１１に沿って延びる。第１軸Ａ１１は、第１方向に延びる。シャフト１２１は、第１支持部１２１Ａと、第２支持部１２１Ｂと、第３支持部１２１Ｃと、フランジ１２１Ｄとを有する。 2.2.1 Shaft 121
As shown in FIGS. 4 and 5, the shaft 121 extends along the first axis A11. The first axis A11 extends in the first direction. The shaft 121 has a first support portion 121A, a second support portion 121B, a third support portion 121C, and a flange 121D.
　第１支持部１２１Ａは、第１ギア１２２を支持する。第１支持部１２１Ａは、第１方向において、シャフト１２１の一端部に位置する。第１支持部１２１Ａは、第１方向に延びる。第１支持部１２１Ａは、円柱形状を有する。第１支持部１２１Ａは、第１方向から見て、円形状を有する。 The first support portion 121A supports the first gear 122. The first support portion 121A is located at one end of the shaft 121 in the first direction. The first support portion 121A extends in the first direction. The first support portion 121A has a cylindrical shape. The first support portion 121A has a circular shape when viewed from the first direction.
　第２支持部１２１Ｂは、第２ギア１２３を支持する。第２支持部１２１Ｂは、第１方向において、第１支持部１２１Ａから離れて位置する。第２支持部１２１Ｂは、第１方向において、シャフト１２１の他端部に位置する。第２支持部１２１Ｂは、第１方向に延びる。第２支持部１２１Ｂは、第１方向から見て、Ｄ字形状を有する。詳しくは、第２支持部１２１Ｂは、円弧面Ｓ１と、平面Ｓ２とを有する。円弧面Ｓ１は、第１ギア１２２の回転方向に延びる。平面Ｓ２は、第１ギア１２２の径方向に延びる。平面Ｓ２は、第１ギア１２２の回転方向と交差する方向に延びる。 The second support portion 121B supports the second gear 123. The second support portion 121B is located away from the first support portion 121A in the first direction. The second support portion 121B is located at the other end of the shaft 121 in the first direction. The second support portion 121B extends in the first direction. The second support portion 121B has a D-shape when viewed from the first direction. Specifically, the second support portion 121B has an arc surface S1 and a plane S2. The arcuate surface S1 extends in the rotational direction of the first gear 122. The plane S2 extends in the radial direction of the first gear 122. The plane S2 extends in a direction intersecting the rotation direction of the first gear 122.
　第３支持部１２１Ｃは、第１クラッチ１２４を支持する。第３支持部１２１Ｃは、第１方向において、第１支持部１２１Ａと第２支持部１２１Ｂとの間に位置する。第３支持部１２１Ｃは、第１方向に延びる。第３支持部１２１Ｃは、第１方向から見て、Ｄ字形状を有する。詳しくは、第３支持部１２１Ｃは、円弧面Ｓ１１と、平面Ｓ１２とを有する。円弧面Ｓ１１は、第１ギア１２２の回転方向に延びる。平面Ｓ１２は、第１ギア１２２の径方向に延びる。平面Ｓ１２は、第１ギア１２２の回転方向と交差する方向に延びる。 The third support portion 121C supports the first clutch 124. The third support portion 121C is located between the first support portion 121A and the second support portion 121B in the first direction. The third support portion 121C extends in the first direction. The third support portion 121C has a D-shape when viewed from the first direction. Specifically, the third support portion 121C has an arcuate surface S11 and a flat surface S12. The arcuate surface S11 extends in the rotational direction of the first gear 122. The plane S12 extends in the radial direction of the first gear 122. The plane S12 extends in a direction intersecting the rotation direction of the first gear 122.
　フランジ１２１Ｄは、第１方向において、第１支持部１２１Ａと第３支持部１２１Ｃとの間に位置する。フランジ１２１Ｄは、シャフト１２１の周面に位置する。フランジ１２１Ｄは、シャフト１２１の周面から延びる。なお、フランジ１２１Ｄは、シャフト１２１とは別の部材であってもよい。フランジ１２１Ｄは、シャフト１２１の周面に取り付けられてもよい。フランジ１２１Ｄは、円板形状を有する。シャフト１２１に第１ギア１２２が取り付けられた状態で、フランジ１２１Ｄは、第１方向において、第１ギア１２１の一端部Ｅ１と向かい合う。シャフト１２１に第１ギア１２２が取り付けられた状態で、フランジ１２１Ｄは、第１方向において、第１ギア１２２から、わずかに離れている。 The flange 121D is located between the first support portion 121A and the third support portion 121C in the first direction. The flange 121D is located on the peripheral surface of the shaft 121. The flange 121D extends from the peripheral surface of the shaft 121. The flange 121D may be a member different from the shaft 121. The flange 121D may be attached to the peripheral surface of the shaft 121. The flange 121D has a disk shape. With the first gear 122 attached to the shaft 121, the flange 121D faces one end E1 of the first gear 121 in the first direction. With the first gear 122 attached to the shaft 121, the flange 121D is slightly distant from the first gear 122 in the first direction.
　シャフト１２１に第１ギア１２２が取り付けられた状態で、第１ギア１２２が、第１方向において第１クラッチ１２４に近づく方向に移動した場合、フランジ１２１Ｄは、第１ギア１２２と接触して、第１方向への第１ギア１２２の移動を止める。 When the first gear 122 moves in the first direction toward the first clutch 124 with the first gear 122 attached to the shaft 121, the flange 121D comes into contact with the first gear 122 and becomes the first gear 122. Stop the movement of the first gear 122 in one direction.
　なお、シャフト１２１に第１ギア１２２が取り付けられた状態で、第１ギア１２２が、第１方向において第１クラッチ１２４から離れる方向に移動した場合、シャフト１２１の一端部を支持する図示しないフレームが、第１方向への第１ギア１２２の移動を止める。 When the first gear 122 moves away from the first clutch 124 in the first direction with the first gear 122 attached to the shaft 121, a frame (not shown) supporting one end of the shaft 121 is provided. , Stop the movement of the first gear 122 in the first direction.
　２．２．２　第１ギア１２２
　図３に示すように、第１ギア１２２は、モータ１１からの動力を受ける。第１ギア１２２は、モータ１１からの動力を受けて、回転する。モータ１１が正回転している場合、第１ギア１２２は、第１回転方向に回転する。モータ１１が逆回転している場合、第１ギア１２２は、第２回転方向に回転する。第２回転方向は、第１回転方向とは逆方向である。第１ギア１２２は、図示しないアイドルギアを介してモータ１１の出力ギアに接続されてもよい。 2.2.2 1st gear 122
As shown in FIG. 3, the first gear 122 receives power from the motor 11. The first gear 122 receives power from the motor 11 and rotates. When the motor 11 is rotating in the forward direction, the first gear 122 rotates in the first rotation direction. When the motor 11 is rotating in the reverse direction, the first gear 122 rotates in the second rotation direction. The second rotation direction is opposite to the first rotation direction. The first gear 122 may be connected to the output gear of the motor 11 via an idle gear (not shown).
　図４に示すように、第１ギア１２２は、ヘリカルギアである。第１ギア１２２は、第１軸Ａ１１について回転可能である。第１ギア１２２は、第１方向において、一端部Ｅ１と、他端部Ｅ２とを有する。他端部Ｅ２は、第１方向において、一端部Ｅ１と第１クラッチ１２４との間に位置する。第１ギア１２２は、穴１２２Ａを有する。 As shown in FIG. 4, the first gear 122 is a helical gear. The first gear 122 is rotatable with respect to the first axis A11. The first gear 122 has one end E1 and the other end E2 in the first direction. The other end E2 is located between the one end E1 and the first clutch 124 in the first direction. The first gear 122 has a hole 122A.
　穴１２２Ａは、第１ギア１２２の径方向において、第１ギア１２２の中央に位置する。穴１２２Ａは、円形状を有する。 The hole 122A is located at the center of the first gear 122 in the radial direction of the first gear 122. The hole 122A has a circular shape.
　図５に示すように、シャフト１２１の第１支持部１２１Ａは、穴１２２Ａ内に嵌まる。これにより、第１ギア１２２は、シャフト１２１の第１支持部１２１Ａに支持される。第１ギア１２２は、シャフト１２１の第１支持部１２１Ａに対して回転可能である。 As shown in FIG. 5, the first support portion 121A of the shaft 121 fits in the hole 122A. As a result, the first gear 122 is supported by the first support portion 121A of the shaft 121. The first gear 122 is rotatable with respect to the first support portion 121A of the shaft 121.
　２．２．３　第２ギア１２３
　図２に示すように、第２ギア１２３は、第１方向において、第１ギア１２２から離れて位置する。第２ギア１２３は、ヘリカルギアである。第２ギア１２３は、ドラムギア４２と噛み合う。これにより、第２ギア１２３は、感光ドラム４に動力を伝える。第２ギア１２３は、第１軸Ａ１１について回転可能である。 2.2.3 2nd gear 123
As shown in FIG. 2, the second gear 123 is located away from the first gear 122 in the first direction. The second gear 123 is a helical gear. The second gear 123 meshes with the drum gear 42. As a result, the second gear 123 transmits power to the photosensitive drum 4. The second gear 123 is rotatable with respect to the first axis A11.
　図４に示すように、第２ギア１２３は、穴１２３Ａを有する。穴１２３Ａは、第２ギア１２３の径方向において、第２ギア１２３の中央に位置する。穴１２３Ａは、Ｄ字形状を有する。第２ギア１２３は、円弧面Ｓ２１と、平面Ｓ２２とを有する。円弧面Ｓ２１は、穴１２３Ａの内面である。円弧面Ｓ２１は、第１ギア１２２の回転方向に延びる。平面Ｓ２２は、穴１２３Ａの内面である。平面Ｓ２２は、第１ギア１２２の径方向に延びる。平面Ｓ２２は、第１ギア１２２の回転方向と交差する方向に延びる。 As shown in FIG. 4, the second gear 123 has a hole 123A. The hole 123A is located at the center of the second gear 123 in the radial direction of the second gear 123. The hole 123A has a D-shape. The second gear 123 has an arcuate surface S21 and a flat surface S22. The arcuate surface S21 is the inner surface of the hole 123A. The arcuate surface S21 extends in the rotational direction of the first gear 122. The plane S22 is the inner surface of the hole 123A. The plane S22 extends in the radial direction of the first gear 122. The plane S22 extends in a direction intersecting the rotation direction of the first gear 122.
　図５に示すように、シャフト１２１の第２支持部１２１Ｂは、穴１２３Ａ内に嵌まる。これにより、第２ギア１２３は、シャフト１２１の第２支持部１２１Ｂに支持される。第２支持部１２１Ｂの円弧面Ｓ１は、第２ギア１２３の円弧面Ｓ２１と向かい合う。第２支持部１２１Ｂの平面Ｓ２は、第２ギア１２３の平面Ｓ２２と向かい合う。これにより、第２ギア１２３は、シャフト１２１とともに回転可能である。 As shown in FIG. 5, the second support portion 121B of the shaft 121 fits in the hole 123A. As a result, the second gear 123 is supported by the second support portion 121B of the shaft 121. The arcuate surface S1 of the second support portion 121B faces the arcuate surface S21 of the second gear 123. The plane S2 of the second support portion 121B faces the plane S22 of the second gear 123. As a result, the second gear 123 can rotate together with the shaft 121.
　２．２．４　第１クラッチ１２４
　図２に示すように、第１クラッチ１２４は、第１方向において、第１ギア１２２と第２ギア１２３との間に位置する。第１クラッチ１２４は、第１方向において、第１ギア１２２から離れて位置する。第１クラッチ１２４は、第１方向において、第２ギア１２３から離れて位置する。 2.2.4 1st clutch 124
As shown in FIG. 2, the first clutch 124 is located between the first gear 122 and the second gear 123 in the first direction. The first clutch 124 is located away from the first gear 122 in the first direction. The first clutch 124 is located away from the second gear 123 in the first direction.
　第１クラッチ１２４は、第１伝達状態と、第１伝達解除状態に切り替え可能である。第１クラッチ１２４が第１伝達状態である場合、第１クラッチ１２４は、第１ギア１２２から第２ギア１２３に動力を伝達可能である。一方、第１クラッチ１２４が第１伝達解除状態である場合、第１クラッチ１２４は、第１ギア１２２から第２ギア１２３への動力の伝達を解除する。第１クラッチ１２４を第１伝達状態から第１伝達解除状態に切り替えることにより、感光ドラム４の回転を所望のタイミングで止めることができる。 The first clutch 124 can be switched between the first transmission state and the first transmission release state. When the first clutch 124 is in the first transmission state, the first clutch 124 can transmit power from the first gear 122 to the second gear 123. On the other hand, when the first clutch 124 is in the first transmission release state, the first clutch 124 releases the transmission of power from the first gear 122 to the second gear 123. By switching the first clutch 124 from the first transmission state to the first transmission release state, the rotation of the photosensitive drum 4 can be stopped at a desired timing.
　本実施形態では、第１クラッチ１２４は、電磁クラッチである。電磁クラッチは、コイルと、ロータと、アーマチュアとを有する。コイルに通電されている状態で、アーマチュアは、ロータとともに回転可能である。コイルに通電されている状態で、第１クラッチ１２４は、第１伝達状態である。コイルに通電されていない状態で、アーマチュアは、ロータとは独立に回転可能である。コイルに通電されていない状態で、第１クラッチ１２４は、第１伝達解除状態である。 In the present embodiment, the first clutch 124 is an electromagnetic clutch. The electromagnetic clutch has a coil, a rotor, and an armature. With the coil energized, the armature can rotate with the rotor. The first clutch 124 is in the first transmission state while the coil is energized. The armature can rotate independently of the rotor when the coil is not energized. The first clutch 124 is in the first transmission release state when the coil is not energized.
　図４および図５に示すように、第１クラッチ１２４は、さらに、ハブ１２４Ａを有する。 As shown in FIGS. 4 and 5, the first clutch 124 further has a hub 124A.
　ハブ１２４Ａは、ロータとシャフト１２１とを接続する。ハブ１２４Ａは、ロータとともに回転可能である。ハブ１２４Ａは、穴１２４Ｂを有する。穴１２４Ｂは、Ｄ字形状を有する。ハブ１２４Ａは、円弧面Ｓ３１と、平面Ｓ３２とを有する。円弧面Ｓ３１は、穴１２４Ｂの内面である。円弧面Ｓ３１は、第１ギア１２２の回転方向に延びる。平面Ｓ３２は、穴１２４Ｂの内面である。平面Ｓ３２は、第１ギア１２２の径方向に延びる。平面Ｓ３２は、第１ギア１２２の回転方向と交差する方向に延びる。 The hub 124A connects the rotor and the shaft 121. The hub 124A is rotatable with the rotor. The hub 124A has a hole 124B. The hole 124B has a D-shape. The hub 124A has an arcuate surface S31 and a flat surface S32. The arcuate surface S31 is the inner surface of the hole 124B. The arcuate surface S31 extends in the rotational direction of the first gear 122. The plane S32 is the inner surface of the hole 124B. The plane S32 extends in the radial direction of the first gear 122. The plane S32 extends in a direction intersecting the rotation direction of the first gear 122.
　シャフト１２１の第３支持部１２１Ｃは、穴１２４Ｂ内に嵌まる。これにより、第１クラッチ１２４は、シャフト１２１の第３支持部１２１Ｃに支持される。第３支持部１２１Ｃの円弧面Ｓ１１は、ハブ１２４Ａの円弧面Ｓ３１と向かい合う。第３支持部１２１Ｃの平面Ｓ１２は、ハブ１２４Ａの平面Ｓ３２と向かい合う。これにより、シャフト１２１は、ハブ１２４Ａおよびロータとともに回転可能である。 The third support portion 121C of the shaft 121 fits in the hole 124B. As a result, the first clutch 124 is supported by the third support portion 121C of the shaft 121. The arcuate surface S11 of the third support portion 121C faces the arcuate surface S31 of the hub 124A. The plane S12 of the third support portion 121C faces the plane S32 of the hub 124A. As a result, the shaft 121 can rotate together with the hub 124A and the rotor.
　２．２．５　第１カップリング１２５
　図４に示すように、第１カップリング１２５は、第１方向における第１ギア１２２の他端部Ｅ２に位置する。本実施形態では、第１カップリング１２５は、第１ギア１２２の一部である。第１カップリング１２５は、第１ギア１２２とは別の部材であって、第１ギア１２２に取り付けられていてもよい。第１カップリング１２５は、第１ギア１２２とともに回転可能である。第１カップリング１２５は、溝１２５Ａと、溝１２５Ｂとを有する。 2.2.5 1st coupling 125
As shown in FIG. 4, the first coupling 125 is located at the other end E2 of the first gear 122 in the first direction. In this embodiment, the first coupling 125 is part of the first gear 122. The first coupling 125 is a member different from the first gear 122 and may be attached to the first gear 122. The first coupling 125 is rotatable together with the first gear 122. The first coupling 125 has a groove 125A and a groove 125B.
　溝１２５Ａは、第１ギア１２２の径方向に延びる。溝１２５Ａが延びる方向を第２方向と定義する。第２方向は、第１ギア１２２の回転方向と交差する。溝１２５Ａは、第２方向において、穴１２２Ａから離れて位置する。 The groove 125A extends in the radial direction of the first gear 122. The direction in which the groove 125A extends is defined as the second direction. The second direction intersects the rotation direction of the first gear 122. The groove 125A is located away from the hole 122A in the second direction.
　溝１２５Ｂは、第２方向において、溝１２５Ａから離れて位置する。溝１２５Ｂは、第２方向において、穴１２２Ａから離れて位置する。溝１２５Ｂは、第２方向において、穴１２２Ａに対して、溝１２５Ａの反対側に位置する。溝１２５Ｂは、第２方向において、第１軸Ａ１１に対して、溝１２５Ａの反対側に位置する。溝１２５Ｂは、第２方向に延びる。言い換えると、溝１２５Ｂは、溝１２５Ａと同じ方向に延びる。 The groove 125B is located away from the groove 125A in the second direction. The groove 125B is located away from the hole 122A in the second direction. The groove 125B is located on the opposite side of the groove 125A with respect to the hole 122A in the second direction. The groove 125B is located on the opposite side of the groove 125A with respect to the first axis A11 in the second direction. The groove 125B extends in the second direction. In other words, the groove 125B extends in the same direction as the groove 125A.
　２．２．６　第２カップリング１２６
　図６に示すように、第２カップリング１２６は、第１方向において、第１クラッチ１２４と第１ギア１２２との間に位置する。第２カップリング１２６は、第１クラッチ１２４のアーマチュアに取り付けられている。第２カップリング１２６は、第１クラッチ１２４のアーマチュアとともに回転可能である。 2.2.6 Second coupling 126
As shown in FIG. 6, the second coupling 126 is located between the first clutch 124 and the first gear 122 in the first direction. The second coupling 126 is attached to the armature of the first clutch 124. The second coupling 126 is rotatable with the armature of the first clutch 124.
　第２カップリング１２６は、第１カップリング１２５（図４参照）に嵌まる。第２カップリング１２６が第１カップリング１２５に嵌まった状態で、第２カップリング１２６は、第１カップリング１２５とともに回転可能である。 The second coupling 126 fits into the first coupling 125 (see FIG. 4). The second coupling 126 is rotatable together with the first coupling 125 with the second coupling 126 fitted in the first coupling 125.
　つまり、第１クラッチ１２４のアーマチュアは、第１カップリング１２５と第２カップリング１２６とによって、モータ１１からの動力を受ける第１ギア１２２に接続される。 That is, the armature of the first clutch 124 is connected to the first gear 122 that receives power from the motor 11 by the first coupling 125 and the second coupling 126.
　ここで、アーマチュアが第１ギア１２２に直接接続されている場合、アーマチュアが第１ギア１２２に引っ張られて、または、アーマチュアが第１ギア１２２に押されて、第１ギア１２２からアーマチュアに、第１方向への力が加わる可能性がある。 Here, if the armature is directly connected to the first gear 122, the armature is pulled to the first gear 122, or the armature is pushed to the first gear 122, from the first gear 122 to the armature. A force in one direction may be applied.
　具体的には、第１ギア１２２がヘリカルギアであるため、アーマチュアが第１ギア１２２に直接接続されていると、第１ギア１２２のスラスト力によって、第１ギア１２２からアーマチュアに、第１方向への力が加わる。 Specifically, since the first gear 122 is a helical gear, if the armature is directly connected to the first gear 122, the thrust force of the first gear 122 causes the first gear 122 to move from the first gear 122 to the armature in the first direction. The force is added to.
　第１ギア１２２からアーマチュアにトルク以外の力が加わると、第１クラッチ１２４の内部で部品が摩耗するなど、第１クラッチ１２４の劣化が早く進む可能性がある。 When a force other than torque is applied to the armature from the first gear 122, there is a possibility that the deterioration of the first clutch 124 will progress quickly, such as wear of parts inside the first clutch 124.
　この点、本実施形態では、アーマチュアは、第１カップリング１２５と第２カップリング１２６とによって、第１ギア１２２に接続されている。言い換えると、第１ギア１２２と第１クラッチ１２４との間に、第１カップリング１２５と第２カップリング１２６とが挟まれている。 In this respect, in this embodiment, the armature is connected to the first gear 122 by the first coupling 125 and the second coupling 126. In other words, the first coupling 125 and the second coupling 126 are sandwiched between the first gear 122 and the first clutch 124.
　そのため、第１カップリング１２５と第２カップリング１２６とが互いに第１方向に移動可能であることにより、第１ギア１２２からアーマチュアに第１方向への力が加わることを抑制できる。つまり、第１ギア１２２からアーマチュアにトルク以外の力が加わることを抑制できる。その結果、第１クラッチ１２４の劣化を抑制し、第１クラッチ１２４を長持ちさせることができる。 Therefore, since the first coupling 125 and the second coupling 126 can move in the first direction with each other, it is possible to suppress the force applied to the armature from the first gear 122 in the first direction. That is, it is possible to suppress the application of a force other than torque from the first gear 122 to the armature. As a result, deterioration of the first clutch 124 can be suppressed, and the first clutch 124 can be made to last longer.
　詳しくは、第２カップリング１２６は、突起１２６Ａと、突起１２６Ｂとを有する。 Specifically, the second coupling 126 has a protrusion 126A and a protrusion 126B.
　突起１２６Ａは、第２方向に延びる。突起１２６Ａは、第２方向において、穴１２４Ｂから離れて位置する。第２カップリング１２６が第１カップリング１２５に嵌まった状態で、突起１２６Ａは、第１カップリング１２５の溝１２５Ａ（図４参照）に嵌まる。 The protrusion 126A extends in the second direction. The protrusion 126A is located away from the hole 124B in the second direction. With the second coupling 126 fitted in the first coupling 125, the protrusion 126A fits into the groove 125A (see FIG. 4) of the first coupling 125.
　突起１２６Ｂは、第２方向において、突起１２６Ａから離れて位置する。突起１２６Ｂは、第２方向において、穴１２４Ｂから離れて位置する。突起１２６Ｂは、第２方向において、穴１２４Ｂに対して、突起１２６Ａの反対側に位置する。突起１２６Ｂは、第２方向において、第１軸Ａ１１に対して、突起１２６Ａの反対側に位置する。突起１２６Ｂは、第２方向に延びる。言い換えると、突起１２６Ｂは、突起１２６Ａと同じ方向に延びる。第２カップリング１２６が第１カップリング１２５に嵌まった状態で、突起１２６Ｂは、第１カップリング１２５の溝１２５Ｂ（図４参照）に嵌まる。突起１２６Ａが第１カップリング１２５の溝１２５Ａに嵌まり、突起１２６Ｂが第１カップリング１２５の溝１２５Ｂに嵌まることにより、第２カップリング１２６は、第１カップリング１２５とともに回転可能である。 The protrusion 126B is located away from the protrusion 126A in the second direction. The protrusion 126B is located away from the hole 124B in the second direction. The protrusion 126B is located on the opposite side of the protrusion 126A with respect to the hole 124B in the second direction. The protrusion 126B is located on the opposite side of the protrusion 126A with respect to the first axis A11 in the second direction. The protrusion 126B extends in the second direction. In other words, the protrusion 126B extends in the same direction as the protrusion 126A. With the second coupling 126 fitted in the first coupling 125, the protrusion 126B fits into the groove 125B (see FIG. 4) of the first coupling 125. The protrusion 126A fits into the groove 125A of the first coupling 125 and the protrusion 126B fits into the groove 125B of the first coupling 125 so that the second coupling 126 can rotate with the first coupling 125.
　第２カップリング１２６が第１カップリング１２５に嵌まった状態で、第２カップリング１２６は、第１カップリング１２５に対して、第１軸Ａ１１が延びる第１方向に移動可能である。これにより、第２カップリング１２６が第１カップリング１２５とともに回転している状態で、第２カップリング１２６は、第１カップリング１２５に対して、第１軸Ａ１１が延びる第１方向に、移動可能である。つまり、第１カップリング１２５と第２カップリング１２６とが互いに第１方向にずれることを許容しつつ、第１カップリング１２５と第２カップリング１２６との間でトルクを伝達できる。 With the second coupling 126 fitted in the first coupling 125, the second coupling 126 can move with respect to the first coupling 125 in the first direction in which the first axis A11 extends. As a result, while the second coupling 126 is rotating together with the first coupling 125, the second coupling 126 moves with respect to the first coupling 125 in the first direction in which the first axis A11 extends. It is possible. That is, torque can be transmitted between the first coupling 125 and the second coupling 126 while allowing the first coupling 125 and the second coupling 126 to deviate from each other in the first direction.
　また、第２カップリング１２６が第１カップリング１２５に嵌まった状態で、第２カップリング１２６は、第１カップリング１２５に対して、突起１２６Ａおよび突起１２６Ｂが延びる第２方向にも移動可能である。つまり、第２方向は、第１ギア１２２の径方向のうち、第１カップリング１２５に対する第２カップリング１２６の移動方向である。これにより、第２カップリング１２６が第１カップリング１２５とともに回転している状態で、第２カップリング１２６は、第１カップリング１２５に対して、第２方向に、移動可能である。言い換えると、第２カップリング１２６が第１カップリング１２５とともに回転している状態で、第２カップリング１２６は、第１カップリング１２５に対して、第１ギア１２２の径方向に、移動可能である。つまり、第１カップリング１２５と第２カップリング１２６とが互いに第２方向にずれることを許容しつつ、第１カップリング１２５と第２カップリング１２６との間でトルクを伝達できる。 Further, with the second coupling 126 fitted in the first coupling 125, the second coupling 126 can move with respect to the first coupling 125 in the second direction in which the protrusion 126A and the protrusion 126B extend. Is. That is, the second direction is the movement direction of the second coupling 126 with respect to the first coupling 125 in the radial direction of the first gear 122. As a result, the second coupling 126 can move in the second direction with respect to the first coupling 125 while the second coupling 126 is rotating together with the first coupling 125. In other words, with the second coupling 126 rotating with the first coupling 125, the second coupling 126 is movable relative to the first coupling 125 in the radial direction of the first gear 122. be. That is, torque can be transmitted between the first coupling 125 and the second coupling 126 while allowing the first coupling 125 and the second coupling 126 to deviate from each other in the second direction.
　ここで、第１ギア１２２がシャフト１２１の第１支持部１２１Ａに支持された状態で、第１ギア１２２の穴１２２Ａの内面と、第１支持部１２１Ａの周面との間には、第１ギア１２２の径方向において、第１支持部１２１Ａが穴１２２Ａに嵌まることを許容するわずかな隙間がある。そのため、第１ギア１２２が回転している状態で、第１ギア１２２の回転軸は、第１ギア１２２の径方向に、わずかにずれる。 Here, in a state where the first gear 122 is supported by the first support portion 121A of the shaft 121, the first gear 122 is between the inner surface of the hole 122A of the first gear 122 and the peripheral surface of the first support portion 121A. In the radial direction of the gear 122, there is a slight gap that allows the first support portion 121A to fit into the hole 122A. Therefore, while the first gear 122 is rotating, the rotation axis of the first gear 122 is slightly displaced in the radial direction of the first gear 122.
　この点、本実施形態では、第２カップリング１２６が第１カップリング１２５に対して第１ギア１２２の径方向に移動可能であることにより、第１ギア１２２からアーマチュアに第１ギア１２２の径方向への力が加わることを抑制できる。つまり、第１ギア１２２からアーマチュアにトルク以外の力が加わることを抑制できる。 In this respect, in the present embodiment, since the second coupling 126 is movable in the radial direction of the first gear 122 with respect to the first coupling 125, the diameter of the first gear 122 is changed from the first gear 122 to the armature. It is possible to suppress the application of force in the direction. That is, it is possible to suppress the application of a force other than torque from the first gear 122 to the armature.
　その結果、第１クラッチ１２４の劣化を抑制し、第１クラッチ１２４を長持ちさせることができる。 As a result, deterioration of the first clutch 124 can be suppressed and the first clutch 124 can be made to last longer.
　第１クラッチ１２４が第１伝達状態であり、第１ギア１２２が回転している場合、動力は、第１ギア１２２から、第１カップリング１２５、第２カップリング１２６およびアーマチュアを介して、ロータに伝わる。これにより、ロータは、回転する。ロータが回転すると、ロータとともに、シャフト１２１および第２ギア１２３が回転する。これにより、第１クラッチ１２４が第１伝達状態である場合、動力は、第１ギア１２２から第２ギア１２３に伝わる。 When the first clutch 124 is in the first transmission state and the first gear 122 is rotating, power is supplied from the first gear 122 via the first coupling 125, the second coupling 126 and the armature. It is transmitted to. As a result, the rotor rotates. When the rotor rotates, the shaft 121 and the second gear 123 rotate together with the rotor. As a result, when the first clutch 124 is in the first transmission state, power is transmitted from the first gear 122 to the second gear 123.
　一方、第１クラッチ１２４が第１伝達解除状態であり、第１ギア１２２が回転している場合、動力は、アーマチュアからロータに伝わらない。そのため、ロータは、回転しない。ロータが回転しないので、シャフト１２１および第２ギア１２３も回転しない。これにより、第１クラッチ１２４が第１伝達解除状態である場合、動力は、第１ギア１２２から第２ギア１２３に伝わらない。 On the other hand, when the first clutch 124 is in the first transmission release state and the first gear 122 is rotating, the power is not transmitted from the armature to the rotor. Therefore, the rotor does not rotate. Since the rotor does not rotate, the shaft 121 and the second gear 123 also do not rotate. As a result, when the first clutch 124 is in the first transmission release state, the power is not transmitted from the first gear 122 to the second gear 123.
　２．３　現像ギア列１３
　図３に示すように、現像ギア列１３は、モータ１１からの動力を、ドラムギア列１２を介して受けて、現像装置７に伝える。言い換えると、現像ギア列１３は、モータ１１からの動力を、ドラムギア列１２を介して受けて、現像ローラ７２に伝える。具体的には、現像ギア列１３は、第１ギア１２２から現像装置７に動力を伝える。現像ギア列１３は、第２クラッチ１３１を有する。 2.3 Develop gear row 13
As shown in FIG. 3, the developing gear train 13 receives the power from the motor 11 via the drum gear train 12 and transmits the power to the developing device 7. In other words, the developing gear train 13 receives the power from the motor 11 via the drum gear train 12 and transmits the power to the developing roller 72. Specifically, the developing gear train 13 transmits power from the first gear 122 to the developing device 7. The developing gear train 13 has a second clutch 131.
　第２クラッチ１３１は、第１ギア１２２と現像装置７との間に位置する。本実施形態では、第２クラッチ１３１は、電磁クラッチである。 The second clutch 131 is located between the first gear 122 and the developing device 7. In the present embodiment, the second clutch 131 is an electromagnetic clutch.
　第２クラッチ１３１は、第２伝達状態と、第２伝達解除状態に切り替え可能である。第２クラッチ１３１が第２伝達状態である場合、第２クラッチ１３１は、第１ギア１２２から現像装置７への動力を伝達可能である。これにより、第２クラッチ１３１が第２伝達状態である場合、第２クラッチ１３１は、現像ローラ７２に動力を伝達可能である。一方、第２クラッチ１３１が第２伝達解除状態である場合、第２クラッチ１３１は、第１ギア１２２から現像装置７への動力の伝達を解除する。これにより、第２クラッチ１３１が第２伝達解除状態である場合、第２クラッチ１３１は、現像ローラ７２への動力の伝達を解除する。 The second clutch 131 can be switched between the second transmission state and the second transmission release state. When the second clutch 131 is in the second transmission state, the second clutch 131 can transmit power from the first gear 122 to the developing device 7. As a result, when the second clutch 131 is in the second transmission state, the second clutch 131 can transmit power to the developing roller 72. On the other hand, when the second clutch 131 is in the second transmission release state, the second clutch 131 releases the power transmission from the first gear 122 to the developing device 7. As a result, when the second clutch 131 is in the second transmission release state, the second clutch 131 releases the power transmission to the developing roller 72.
　２．４　クリーニング部材１４
　図１に示すように、クリーニング部材１４は、転写ローラ８をクリーニングする。本実施形態では、クリーニング部材１４は、クリーニングローラである。クリーニング部材１４は、転写ローラ８の表面と接触する。クリーニング部材１４は、転写ローラ８が回転している状態で、転写ローラ８の表面をクリーニングする。 2.4 Cleaning member 14
As shown in FIG. 1, the cleaning member 14 cleans the transfer roller 8. In this embodiment, the cleaning member 14 is a cleaning roller. The cleaning member 14 comes into contact with the surface of the transfer roller 8. The cleaning member 14 cleans the surface of the transfer roller 8 while the transfer roller 8 is rotating.
　２．５　クリーニングギア列１５
　図３に示すように、クリーニングギア列１５は、モータ１１からの動力を、ドラムギア列１２を介して受けて、クリーニング部材１４に伝える。具体的には、クリーニングギア列１５は、第１ギア１２２からクリーニング部材１４に動力を伝える。クリーニングギア列１５は、ワンウェイクラッチ１５１を有する。 2.5 Cleaning gear row 15
As shown in FIG. 3, the cleaning gear train 15 receives the power from the motor 11 via the drum gear train 12 and transmits the power to the cleaning member 14. Specifically, the cleaning gear row 15 transmits power from the first gear 122 to the cleaning member 14. The cleaning gear row 15 has a one-way clutch 151.
　ワンウェイクラッチ１５１は、第１ギア１２２とクリーニング部材１４との間に位置する。第１ギア１２２が第１回転方向に回転する場合、ワンウェイクラッチ１５１は、クリーニング部材１４への動力を伝達しない。そのため、第１ギア１２２が第１回転方向に回転する場合、クリーニング部材１４は、回転しない。一方、第１ギア１２２が第２回転方向に回転する場合、ワンウェイクラッチ１５１は、クリーニング部材１４への動力を伝達する。そのため、第１ギア１２２が第２回転方向に回転する場合、クリーニング部材１４は、回転する。 The one-way clutch 151 is located between the first gear 122 and the cleaning member 14. When the first gear 122 rotates in the first rotation direction, the one-way clutch 151 does not transmit the power to the cleaning member 14. Therefore, when the first gear 122 rotates in the first rotation direction, the cleaning member 14 does not rotate. On the other hand, when the first gear 122 rotates in the second rotation direction, the one-way clutch 151 transmits power to the cleaning member 14. Therefore, when the first gear 122 rotates in the second rotation direction, the cleaning member 14 rotates.
　２．６　制御装置１６
　図３に破線で示すように、制御装置１６は、モータ１１、第１クラッチ１２４および第２クラッチ１３１と電気的に接続される。制御装置１６は、モータ１１、第１クラッチ１２４および第２クラッチ１３１を制御する。 2.6 Control device 16
As shown by the broken line in FIG. 3, the control device 16 is electrically connected to the motor 11, the first clutch 124, and the second clutch 131. The control device 16 controls the motor 11, the first clutch 124, and the second clutch 131.
　３．画像形成装置１の制御
　次に、図１、図２、図３および図７を参照して、画像形成装置１の制御について説明する。 3. 3. Control of the image forming apparatus 1 Next, the control of the image forming apparatus 1 will be described with reference to FIGS. 1, 2, 3 and 7.
　図７に示すように、画像形成装置１が印刷ジョブを受信すると、制御装置１６は、第１クラッチ１２４を第１伝達状態にし（Ｓ１）、第２クラッチ１３１を第２伝達状態にし（Ｓ２）、モータ１１を正回転させる（Ｓ３）。 As shown in FIG. 7, when the image forming apparatus 1 receives the print job, the control apparatus 16 sets the first clutch 124 in the first transmission state (S1) and the second clutch 131 in the second transmission state (S2). , The motor 11 is rotated in the forward direction (S3).
　すると、図３に示すように、モータ１１からの動力は、ドラムギア列１２により、感光ドラム４に伝達される。これにより、感光ドラム４が回転する。また、感光ドラム４とともに、転写ローラ８が回転する。本実施形態では、転写ローラ８は、ドラムギア４２（図２参照）から動力を受けて回転する。また、モータ１１からの動力は、現像ギア列１３により、現像装置７に伝達される。これにより、現像ローラ７２が回転する。 Then, as shown in FIG. 3, the power from the motor 11 is transmitted to the photosensitive drum 4 by the drum gear train 12. As a result, the photosensitive drum 4 rotates. Further, the transfer roller 8 rotates together with the photosensitive drum 4. In the present embodiment, the transfer roller 8 rotates by receiving power from the drum gear 42 (see FIG. 2). Further, the power from the motor 11 is transmitted to the developing device 7 by the developing gear train 13. As a result, the developing roller 72 rotates.
　このとき、モータ１１が正回転していることにより、第１ギア１２２は、第１回転方向に回転する。そのため、クリーニングギア列１５のワンウェイクラッチ１５１は、クリーニング部材１４への動力を伝達しない。これにより、クリーニング部材１４は、回転しない。クリーニング部材１４が転写ローラ８に接触した状態で、回転しないクリーニング部材１４に対して転写ローラ８が回転することにより、転写ローラ８の表面は、クリーニング部材１４と擦れる。これにより、転写ローラ８の表面は、クリーニング部材１４でクリーニングされる。言い換えると、クリーニング部材１４が転写ローラ８の表面をクリーニングする場合、クリーニング部材１４は、回転しないで、転写ローラ８は、回転する。 At this time, the first gear 122 rotates in the first rotation direction due to the forward rotation of the motor 11. Therefore, the one-way clutch 151 of the cleaning gear row 15 does not transmit the power to the cleaning member 14. As a result, the cleaning member 14 does not rotate. When the transfer roller 8 rotates with respect to the non-rotating cleaning member 14 while the cleaning member 14 is in contact with the transfer roller 8, the surface of the transfer roller 8 rubs against the cleaning member 14. As a result, the surface of the transfer roller 8 is cleaned by the cleaning member 14. In other words, when the cleaning member 14 cleans the surface of the transfer roller 8, the cleaning member 14 does not rotate, but the transfer roller 8 rotates.
　ここで、クリーニング部材１４が回転しないため、クリーニング部材１４の表面の、転写ローラ８と接触する部分が、集中して汚れる。 Here, since the cleaning member 14 does not rotate, the portion of the surface of the cleaning member 14 that comes into contact with the transfer roller 8 is concentrated and soiled.
　そのため、クリーニング部材１４を回転させて、転写ローラ８と接触する部分を変える必要がある。 Therefore, it is necessary to rotate the cleaning member 14 to change the portion in contact with the transfer roller 8.
　そこで、制御装置１６は、印刷ジョブが終了した後（Ｓ４：ＹＥＳ）、印刷したシートＳの枚数（累積印刷枚数）が所定の枚数（閾値）に達した場合に（Ｓ５：ＹＥＳ）、第２クラッチ１３１を第２伝達解除状態にし（Ｓ６）、第１クラッチ１２４を第１伝達解除状態にし（Ｓ７）、モータ１１を逆回転させる（Ｓ８）。 Therefore, the control device 16 is second when the number of printed sheets S (cumulative number of printed sheets) reaches a predetermined number (threshold) (S5: YES) after the print job is completed (S4: YES). The clutch 131 is set to the second transmission release state (S6), the first clutch 124 is set to the first transmission release state (S7), and the motor 11 is rotated in the reverse direction (S8).
　すると、第１ギア１２２から現像装置７への動力の伝達が解除されることにより、現像ローラ７２が止まる。また、第１ギア１２２から感光ドラム４への動力の伝達が解除されることにより、感光ドラム４および転写ローラ８が止まる。 Then, the transmission of the power from the first gear 122 to the developing device 7 is released, so that the developing roller 72 stops. Further, the transmission of the power from the first gear 122 to the photosensitive drum 4 is released, so that the photosensitive drum 4 and the transfer roller 8 are stopped.
　このとき、モータ１１が逆回転していることにより、第１ギア１２２は、第２回転方向に回転する。つまり、制御装置１６は、印刷したシートＳの枚数が所定の枚数に達した場合に、第１クラッチ１２４を第１伝達解除状態にし、かつ、第１ギア１２２を第２回転方向に回転させる。 At this time, the first gear 122 rotates in the second rotation direction due to the reverse rotation of the motor 11. That is, when the number of printed sheets S reaches a predetermined number, the control device 16 puts the first clutch 124 in the first transmission release state and rotates the first gear 122 in the second rotation direction.
　第１ギア１２２が第２回転方向に回転することにより、クリーニングギア列１５のワンウェイクラッチ１５１は、クリーニング部材１４への動力を伝達する。これにより、制御装置１６は、モータ１１から感光ドラム４への動力の伝達を解除した状態で、モータ１１からクリーニング部材１４へ動力を伝達する。すると、クリーニング部材１４は、回転する。 As the first gear 122 rotates in the second rotation direction, the one-way clutch 151 of the cleaning gear row 15 transmits power to the cleaning member 14. As a result, the control device 16 transmits the power from the motor 11 to the cleaning member 14 in a state where the power transmission from the motor 11 to the photosensitive drum 4 is released. Then, the cleaning member 14 rotates.
　その後、制御装置１６は、モータ１１を逆回転させてから所定の時間が経過した後、モータ１１を停止させる（Ｓ１０）。これにより、クリーニング部材１４の表面の、転写ローラ８に接触する部分が、変わる。つまり、クリーニング部材１４は、クリーニングギア列１５から動力を受けて回転することによって、転写ローラ８に接触する部分を変える。 After that, the control device 16 stops the motor 11 after a predetermined time has elapsed since the motor 11 was rotated in the reverse direction (S10). As a result, the portion of the surface of the cleaning member 14 that comes into contact with the transfer roller 8 changes. That is, the cleaning member 14 changes the portion in contact with the transfer roller 8 by rotating under the power of the cleaning gear train 15.
　なお、制御装置１６は、印刷ジョブが終了した後（Ｓ４：ＹＥＳ）、印刷したシートＳの枚数（累積印刷枚数）が所定の枚数（閾値）に達していない場合に（Ｓ５：ＮＯ）、モータ１１を逆回転させずに、モータ１１を停止させる（Ｓ１０）。
４．作用効果
　（１）画像形成装置１によれば、図１に示すように、クリーニング部材１４により、転写ローラ８をクリーニングできる。 When the number of printed sheets S (cumulative number of printed sheets) does not reach a predetermined number (threshold value) after the print job is completed (S4: YES), the control device 16 is a motor. The motor 11 is stopped without rotating the 11 in the reverse direction (S10).
4. Action Effect (1) According to the image forming apparatus 1, as shown in FIG. 1, the transfer roller 8 can be cleaned by the cleaning member 14.
　また、図３に示すように、クリーニングギア列１５は、モータ１１からの動力を、ドラムギア列１２から受けて、クリーニング部材１４へ伝えることができる。 Further, as shown in FIG. 3, the cleaning gear row 15 can receive the power from the motor 11 from the drum gear row 12 and transmit the power to the cleaning member 14.
　そのため、感光ドラム４を回転させるためのモータ１１を利用して、クリーニング部材１４を駆動させることができる。 Therefore, the cleaning member 14 can be driven by using the motor 11 for rotating the photosensitive drum 4.
　また、クリーニングギア列１５がワンウェイクラッチ１５１を有しているため、クリーニング部材１４を駆動させる必要が無い場合には、クリーニング部材１４への動力の伝達を解除することもできる。 Further, since the cleaning gear row 15 has the one-way clutch 151, it is possible to cancel the transmission of the power to the cleaning member 14 when it is not necessary to drive the cleaning member 14.
　これにより、簡易な構成で、必要に応じて、クリーニング部材１４を駆動させることができる。 As a result, the cleaning member 14 can be driven as needed with a simple configuration.
　（２）画像形成装置１によれば、クリーニング部材１４が転写ローラ８の表面をクリーニングする場合、クリーニング部材１４は、回転しないで、転写ローラ８は、回転する。 (2) According to the image forming apparatus 1, when the cleaning member 14 cleans the surface of the transfer roller 8, the cleaning member 14 does not rotate, but the transfer roller 8 rotates.
　これにより、印刷中に、転写ローラ８の回転を利用して、転写ローラ８をクリーニングできる。 Thereby, the transfer roller 8 can be cleaned by utilizing the rotation of the transfer roller 8 during printing.
　また、印刷中にクリーニング部材１４を回転させないことにより、印刷中にモータ１１にかかる負荷が増大することを、抑制できる。 Further, by not rotating the cleaning member 14 during printing, it is possible to suppress an increase in the load applied to the motor 11 during printing.
　（３）画像形成装置１によれば、クリーニング部材１４は、クリーニングギア列１５から動力を受けて回転することによって、転写ローラ８に接触する部分を変える。 (3) According to the image forming apparatus 1, the cleaning member 14 changes a portion in contact with the transfer roller 8 by being rotated by receiving power from the cleaning gear row 15.
　これにより、転写ローラ８に接触する部分を変えて、新しく転写ローラ８に接触する部分で、転写ローラ８をクリーニングできる。 Thereby, the part in contact with the transfer roller 8 can be changed, and the transfer roller 8 can be cleaned at the part newly in contact with the transfer roller 8.
　（４）画像形成装置１によれば、図７に示すように、制御装置１６は、印刷したシートＳの枚数が所定の枚数に達した場合（Ｓ５：ＹＥＳ）に、第１クラッチ１２４を第１伝達解除状態にし（Ｓ７）、かつ、第１ギア１２２を第２回転方向に回転させる（Ｓ８）。 (4) According to the image forming apparatus 1, as shown in FIG. 7, when the number of printed sheets S reaches a predetermined number (S5: YES), the control device 16 sets the first clutch 124. 1 The transmission is released (S7), and the first gear 122 is rotated in the second rotation direction (S8).
　これにより、制御装置１６は、モータ１１から感光ドラム４への動力の伝達を解除した状態で、モータ１１からクリーニング部材１４へ動力を伝達する。 As a result, the control device 16 transmits the power from the motor 11 to the cleaning member 14 in a state where the power transmission from the motor 11 to the photosensitive drum 4 is released.
　そのため、印刷していないときに、感光ドラム４を止めた状態で、クリーニング部材１４を回転させることができる。 Therefore, when not printing, the cleaning member 14 can be rotated with the photosensitive drum 4 stopped.
　（５）画像形成装置１によれば、図２に示すように、第１クラッチ１２４は、第１ギア１２２と第２ギア１２３との間に位置する。 (5) According to the image forming apparatus 1, as shown in FIG. 2, the first clutch 124 is located between the first gear 122 and the second gear 123.
　言い換えると、第１ギア１２２、第２ギア１２３および第１クラッチ１２４は、第１軸Ａ１１に沿って並ぶ。 In other words, the first gear 122, the second gear 123, and the first clutch 124 are arranged along the first axis A11.
　そのため、第１ギア１２２、第２ギア１２３および第１クラッチ１２４が第１軸Ａ１１と交差する方向に並ぶ場合と比べて、第１軸Ａ１１と交差する方向における小さなスペースに、第１ギア１２２、第２ギア１２３および第１クラッチ１２４を配置できる。 Therefore, compared to the case where the first gear 122, the second gear 123, and the first clutch 124 are lined up in the direction intersecting the first axis A11, the first gear 122, The second gear 123 and the first clutch 124 can be arranged.
　その結果、大型化を抑制しつつ、ドラムギア列１２に第１クラッチ１２４を設けることができる。 As a result, the first clutch 124 can be provided in the drum gear row 12 while suppressing the increase in size.
　（６）画像形成装置１によれば、図３に示すように、現像ギア列１３は、第２クラッチ１３１を有する。第２クラッチ１３１が第２伝達状態である場合、第２クラッチ１３１は、現像ローラ７２に動力を伝達可能である。第２クラッチ１３１が第２伝達解除状態である場合、第２クラッチ１３１は、現像ローラ７２への動力の伝達を解除する。 (6) According to the image forming apparatus 1, as shown in FIG. 3, the developing gear train 13 has a second clutch 131. When the second clutch 131 is in the second transmission state, the second clutch 131 can transmit power to the developing roller 72. When the second clutch 131 is in the second transmission release state, the second clutch 131 releases the transmission of power to the developing roller 72.
　そのため、第２クラッチ１３１を第２伝達状態から第２伝達解除状態に切り替えることにより、現像ローラ７２の回転を所望のタイミングで止めることができる。 Therefore, by switching the second clutch 131 from the second transmission state to the second transmission release state, the rotation of the developing roller 72 can be stopped at a desired timing.
　５．変形例
　（１）クリーニング部材１４は、クリーニングベルトであってもよい。 5. Modification Example (1) The cleaning member 14 may be a cleaning belt.
　（２）モータ１１は、逆回転しなくてもよい。この場合、モータ１１と第１ギア１２２との間に、第１ギア１２２の回転方向を切り替えるための切替機構が設けられてもよい。 (2) The motor 11 does not have to rotate in the reverse direction. In this case, a switching mechanism for switching the rotation direction of the first gear 122 may be provided between the motor 11 and the first gear 122.
　（３）ギアユニット１２０は、第１ギア１２２、第２ギア１２３および第１クラッチ１２４をまとめて支持するシャフト１２１を有さなくてもよい。第１ギア１２２、第２ギア１２３および第１クラッチ１２４のそれぞれは、独立に、筐体２に支持されていてもよい。 (3) The gear unit 120 does not have to have a shaft 121 that collectively supports the first gear 122, the second gear 123, and the first clutch 124. Each of the first gear 122, the second gear 123, and the first clutch 124 may be independently supported by the housing 2.
　（４）第１クラッチ１２４および第２クラッチ１３１は、メカニカルクラッチであってもよい。 (4) The first clutch 124 and the second clutch 131 may be mechanical clutches.
　（５）上記（１）から（４）に記載の変形例でも、上記した実施形態と同様の作用効果を得ることができる。 (5) Even in the modified examples described in (1) to (4) above, the same action and effect as those in the above-described embodiment can be obtained.
　１　　　　　画像形成装置
　４　　　　　感光ドラム
　８　　　　　転写ローラ
　１１　　　　モータ
　１２　　　　ドラムギア列
　１３　　　　現像ギア列
　１４　　　　クリーニング部材
　１５　　　　クリーニングギア列
　１６　　　　制御装置
　７２　　　　現像ローラ
　１２１　　　シャフト
　１２２　　　第１ギア
　１２３　　　第２ギア
　１２４　　　第１クラッチ
　１３１　　　第２クラッチ
　１５１　　　ワンウェイクラッチ
　Ａ１１　　　第１軸
　Ｓ　　　　　シート 1 Image forming device 4 Photosensitive drum 8 Transfer roller 11 Motor 12 Drum gear row 13 Developing gear row 14 Cleaning member 15 Cleaning gear row 16 Control device 72 Developing roller 121 Shaft 122 1st gear 123 2nd gear 124 1st clutch 131 2nd clutch 151 One-way clutch A11 1st axis S seat

Claims (12)

  1. 　感光ドラムと、
    　前記感光ドラム上のトナーをシートに転写する転写ローラと、
    　前記転写ローラをクリーニングするクリーニング部材と、
    　モータと、
    　前記モータから前記感光ドラムに動力を伝えるためのドラムギア列であって、
    　　前記モータからの動力を受けて回転する第１ギアと、
    　　前記感光ドラムに動力を伝えるための第２ギアと、
    を有するドラムギア列と、
    　前記第１ギアから前記クリーニング部材に動力を伝えるためのクリーニングギア列であって、ワンウェイクラッチを有するクリーニングギア列と、
    を備えることを特徴とする、画像形成装置。     With a photosensitive drum,
    A transfer roller that transfers the toner on the photosensitive drum to the sheet,
    A cleaning member that cleans the transfer roller and
    With the motor
    A drum gear train for transmitting power from the motor to the photosensitive drum.
    The first gear that rotates by receiving power from the motor,
    The second gear for transmitting power to the photosensitive drum,
    With a drum gear row and
    A cleaning gear train for transmitting power from the first gear to the cleaning member, the cleaning gear train having a one-way clutch, and the cleaning gear train.
    An image forming apparatus comprising the above.
  2. 　前記クリーニング部材は、前記転写ローラの表面と接触するクリーニングローラであり、
    　前記クリーニングローラが前記転写ローラの表面をクリーニングする場合、前記クリーニングローラは、回転しないで、前記転写ローラは、回転することを特徴とする、請求項１に記載の画像形成装置。     The cleaning member is a cleaning roller that comes into contact with the surface of the transfer roller.
    The image forming apparatus according to claim 1, wherein when the cleaning roller cleans the surface of the transfer roller, the cleaning roller does not rotate, but the transfer roller rotates.
  3. 　前記クリーニングローラは、前記クリーニングギア列から動力を受けて回転することによって、前記転写ローラに接触する部分を変えることを特徴とする、請求項２に記載の画像形成装置。 The image forming apparatus according to claim 2, wherein the cleaning roller changes a portion in contact with the transfer roller by rotating by receiving power from the cleaning gear train.
  4. 　制御装置と、
    　前記第１ギアから前記第２ギアに動力を伝達可能な第１伝達状態と、前記第１ギアから前記第２ギアへの動力の伝達を解除する第１伝達解除状態に切り替え可能な第１クラッチと、をさらに備え、
    　前記第１ギアが第１回転方向に回転する場合、前記ワンウェイクラッチは、前記クリーニング部材への動力を伝達せず、
    　前記第１ギアが前記第１回転方向とは逆方向の第２回転方向に回転する場合、前記ワンウェイクラッチは、前記クリーニング部材への動力を伝達し、
    　前記制御装置は、印刷したシートの枚数が所定の枚数に達した場合に、前記第１クラッチを前記第１伝達解除状態にし、かつ、前記第１ギアを前記第２回転方向に回転させることにより、前記モータから前記感光ドラムへの動力の伝達を解除した状態で、前記モータから前記クリーニング部材へ動力を伝達することを特徴とする、請求項１から請求項３のいずれか一項に記載の画像形成装置。     With the control device
    A first clutch that can switch between a first transmission state in which power can be transmitted from the first gear to the second gear and a first transmission release state in which power transmission from the first gear to the second gear is released. And, with more
    When the first gear rotates in the first rotation direction, the one-way clutch does not transmit power to the cleaning member.
    When the first gear rotates in the second rotation direction opposite to the first rotation direction, the one-way clutch transmits power to the cleaning member.
    When the number of printed sheets reaches a predetermined number, the control device puts the first clutch in the first transmission release state and rotates the first gear in the second rotation direction. The method according to any one of claims 1 to 3, wherein the power is transmitted from the motor to the cleaning member in a state where the power transmission from the motor to the photosensitive drum is released. Image forming device.
  5. 　前記第１ギアは、第１軸について回転可能であり、
    　前記第２ギアは、前記第１軸について回転可能であることを特徴とする、請求項４に記載の画像形成装置。     The first gear is rotatable about the first axis and is rotatable.
    The image forming apparatus according to claim 4, wherein the second gear is rotatable about the first axis.
  6. 　さらに、前記第１軸に沿って延びるシャフトを備え、
    　前記第１ギア、前記第２ギアおよび前記第１クラッチは、前記シャフトに支持されることを特徴とする、請求項５に記載の画像形成装置。     Further, a shaft extending along the first axis is provided.
    The image forming apparatus according to claim 5, wherein the first gear, the second gear, and the first clutch are supported by the shaft.
  7. 　前記第１クラッチは、前記第１ギアと前記第２ギアとの間に位置することを特徴とする、請求項５または請求項６に記載の画像形成装置。 The image forming apparatus according to claim 5 or 6, wherein the first clutch is located between the first gear and the second gear.
  8. 　前記第１クラッチは、電磁クラッチであることを特徴とする、請求項４から請求項７のいずれか一項に記載の画像形成装置。 The image forming apparatus according to any one of claims 4 to 7, wherein the first clutch is an electromagnetic clutch.
  9. 　現像ローラと、
    　前記モータからの動力を、前記ドラムギア列を介して受けて、前記現像ローラに伝える現像ギア列と、をさらに備えることを特徴とする、請求項１から請求項８のいずれか一項に記載の画像形成装置。     With a developing roller,
    The invention according to any one of claims 1 to 8, further comprising a developing gear train that receives power from the motor via the drum gear train and transmits the power to the developing roller. Image forming device.
  10. 　前記現像ギア列は、前記第１ギアと接続されることを特徴とする、請求項９に記載の画像形成装置。 The image forming apparatus according to claim 9, wherein the developing gear train is connected to the first gear.
  11. 　前記現像ギア列は、前記現像ローラに動力を伝達可能な第２伝達状態と、前記現像ローラへの動力の伝達を解除する第２伝達解除状態に切り替え可能な第２クラッチを、有することを特徴とする、請求項９または請求項１０に記載の画像形成装置。 The developing gear train is characterized by having a second clutch capable of switching between a second transmission state capable of transmitting power to the developing roller and a second transmission releasing state capable of releasing power transmission to the developing roller. The image forming apparatus according to claim 9 or 10.
  12. 　前記第２クラッチは、電磁クラッチであることを特徴とする、請求項１１に記載の画像形成装置。 The image forming apparatus according to claim 11, wherein the second clutch is an electromagnetic clutch.
PCT/JP2021/018375 2020-05-18 2021-05-14 Image forming device WO2021235340A1 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
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JPH11295995A (en) * 1998-04-14 1999-10-29 Nec Niigata Ltd Image forming device
JP2001356619A (en) * 2000-06-15 2001-12-26 Matsushita Electric Ind Co Ltd Transfer device
JP2003167489A (en) * 2001-11-30 2003-06-13 Kyocera Mita Corp Cleaning mechanism for photosensitive body
JP2008015127A (en) * 2006-07-05 2008-01-24 Ricoh Co Ltd Image transfer apparatus and image forming apparatus
JP2017151379A (en) * 2016-02-26 2017-08-31 キヤノン株式会社 Driving unit and image forming device
JP2019086668A (en) * 2017-11-08 2019-06-06 コニカミノルタ株式会社 Image forming apparatus
JP2019100479A (en) * 2017-12-05 2019-06-24 キヤノン株式会社 One-way clutch unit and image heating device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11295995A (en) * 1998-04-14 1999-10-29 Nec Niigata Ltd Image forming device
JP2001356619A (en) * 2000-06-15 2001-12-26 Matsushita Electric Ind Co Ltd Transfer device
JP2003167489A (en) * 2001-11-30 2003-06-13 Kyocera Mita Corp Cleaning mechanism for photosensitive body
JP2008015127A (en) * 2006-07-05 2008-01-24 Ricoh Co Ltd Image transfer apparatus and image forming apparatus
JP2017151379A (en) * 2016-02-26 2017-08-31 キヤノン株式会社 Driving unit and image forming device
JP2019086668A (en) * 2017-11-08 2019-06-06 コニカミノルタ株式会社 Image forming apparatus
JP2019100479A (en) * 2017-12-05 2019-06-24 キヤノン株式会社 One-way clutch unit and image heating device

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