JP2009223247A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of using an image holding body driving device common to image forming apparatuses constituted of the same image output device and having different image forming speed, freely setting natural frequency of the image holding body driving part, and reducing banding caused by resonation with driving transmission frequency or driving source rotation frequency. <P>SOLUTION: The image forming apparatus includes: the image holding body; a driving shaft for driving the image holding body; a driving source for driving the driving shaft; a coupling member fit to the image holding body to follow up rotation of the image holding body; and a coupling member positioning member fit to the driving shaft to follow up rotation of the driving shaft and formed so that it can change positional relation in a shaft direction with the coupling member. By changing a position in the shaft direction of the coupling member relative to the image holding body, rigidity of an assembly comprising the image holding body and the coupling member is changed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image forming apparatus.

  Conventionally, a first flywheel connected to a drive shaft that rotationally drives a drum for forming an image and a position at an interval distance between the drive shaft and the first flywheel are mounted on the first flywheel in a variable state. It is configured to include at least one second flywheel, and the outer diameter of the entire flywheel including the first flywheel and the second flywheel can be easily changed. An image forming apparatus is known (see Patent Document 1).

  Also, a rotation stabilization device that stabilizes the rotation of the target member by being attached to and rotated by the rotation shaft of the target member, the flywheel main body attached to the rotation shaft, and the flywheel main body respectively A plurality of movable bodies supported in a displaceable manner, and a plurality of biasing members provided for each of the movable bodies so as to bias each of the plurality of movable bodies in the direction of the central axis of the flywheel body, A rotation stabilizing device comprising: displacing each of the plurality of movable bodies by the urging force and the centrifugal force at the time of rotation, and moving each center of gravity to a position on a concentric circle of the central axis. Is known (see Patent Document 2).

（但し、ω：駆動系の固有振動数、Ｋ：駆動系のねじり剛性、Ｉ：慣性モーメント）で表される前記駆動系のねじり剛性Ｋを低くすることによって、前記駆動系の固有振動数ωを低くした駆動系を有することを特徴とする画像形成出力装置が知られている（特許文献３参照）。 In order to avoid resonance of the drive system in an image forming output device having a drive system comprising a rotary body and a drive shaft for rotating the rotary body, and a motor and drive transmission system for rotating the drive system In addition,

However, by reducing the torsional rigidity K of the drive system expressed by (ω: natural frequency of the drive system, K: torsional rigidity of the drive system, I: moment of inertia), the natural frequency ω of the drive system is reduced. 2. Description of the Related Art An image forming output device having a drive system with a reduced height is known (see Patent Document 3).

  Further, a first engagement member fixed to the rotation shaft of the image carrier, an engagement portion that can be engaged with the first engagement member, and the rotation shaft of the image carrier are inserted and supported. A second engaging member integrally formed with a positioning hole to be obtained, a shaft portion that is rotatably inserted by being inserted into a bearing portion provided in the apparatus main body, and a gear coupled to a drive source; Urging means for urging the second engagement member with respect to the first engagement member in the rotation axis direction of the image carrier, and a shaft portion of the second engagement member The attachment is carried in a state in which the image bearing member is inserted and supported in a positioning hole of the second engaging member, and is inserted into a bearing portion provided in the apparatus main body and supported rotatably. The engaging portion of the second engaging member is engaged with and connected to the first engaging member by the urging force in the rotation axis direction of the image carrier by the urging means. Image forming apparatus characterized by the rotation axis position of the second engaging member is positioned is known (see Patent Document 4).

  Further, in a drive coupling device that couples an input shaft of a driven unit that is detachably attached to a device frame on one side of an image recording device that can be opened and closed vertically and a drive source, the drive source is driven by the drive source. A connecting member that is slidable in the axial direction and that can be connected to and released from the input shaft, a biasing member that biases the connecting member toward the input shaft, and the connecting member that moves in the axial direction together with the connecting member. A movement release until the connection with the shaft is released, the movement in the axial direction is locked, and the connection release member that unlocks the device case is unlocked, and only the movement until the connection release member is locked together with the connection member, The driven unit can be detached from the apparatus frame, and when the driven unit is attached to the apparatus frame and the apparatus frame is closed, the driving source is connected to the input shaft. Drive device is known (see Patent Document 5).

Japanese Patent Laid-Open No. 10-319786 JP-A-11-231723 Japanese Patent Laid-Open No. 06-133122 JP 2001-147618 A Japanese Patent Laid-Open No. 04-156472

  It is an object of the present invention to be able to use a common image carrier driving device among image forming devices configured with the same image output device and having different image forming speeds, and to provide a unique image carrier driving unit. An object of the present invention is to provide an image forming apparatus in which the frequency can be freely set and banding generated by resonating at a drive transmission frequency or a drive source rotation frequency can be reduced.

  According to the first aspect of the present invention, the image holding member, a drive shaft that drives the image holding member, a drive source that drives the driving shaft, and the rotation of the image holding member and the image holding member are followed. And a connecting member positioning member that is formed so as to follow the rotation of the drive shaft and the drive shaft, and that can change the positional relationship in the axial direction with the connection member, And the rigidity of the assembly of the image holding member and the connecting member is changed by changing the axial position of the connecting member with respect to the image holding member.

  According to a second aspect of the present invention, there is provided an image carrier, a drive shaft that drives the image carrier, a drive shaft gear that is provided on the drive shaft and drives the drive shaft, and a drive that drives the drive shaft gear. A source, a connecting member that fits to follow the rotation of the image carrier, and a fitting member that follows the rotation of the drive shaft and the drive shaft, and an axial direction of the connecting member A connecting member positioning member formed so that the positional relationship between the image holding member and the connecting member can be changed by changing an axial position of the connecting member with respect to the image holding member. An image forming apparatus characterized in that rigidity is changed.

  According to a third aspect of the present invention, the connecting member and the connecting member positioning member are provided on the outer surface of the connecting member and on the inner surface of the connecting member positioning member, and are axially extended from one end surface. 3. The image forming apparatus according to claim 1, wherein a positional relationship between the protrusions having different distances and a plurality of grooves fitted to follow the rotation of the connecting member is changed. is there.

  According to a fourth aspect of the present invention, an image carrier connecting portion receiving portion for fitting the connecting member to the image holding member so as to follow the rotation is provided on the image holding member, and the image holding member connecting portion receiving portion is provided. The image forming apparatus according to claim 1, wherein the thickness of the portion is different from the one end surface in the axial direction.

  A fifth aspect of the present invention is the image forming apparatus according to any one of the first to fourth aspects, wherein the connecting member is formed such that a positional relationship with the connecting member positioning member can be changed by control of a control unit. .

  A sixth aspect of the present invention is the image forming apparatus according to the fifth aspect, wherein the control unit controls the position of the connecting member in accordance with an image forming apparatus speed.

  According to the first aspect of the present invention, compared to the case where the present configuration is not provided, an image carrier driving device that is common among the image forming apparatuses configured with the same image output apparatus and having different image forming speeds. In addition, the natural frequency of the image carrier driving unit can be set freely, and banding generated by resonating at the drive transmission frequency or the drive source rotation frequency can be reduced.

  According to the second aspect of the present invention, compared with the case where the present configuration is not provided, the image holding body driving device which is common among the image forming devices having different image forming speeds which are configured by the same image output device. In addition, the natural frequency of the image carrier driving unit can be set freely, and banding generated by resonating at the drive transmission frequency or the drive source rotation frequency can be reduced.

  According to the third aspect of the present invention, in addition to the above effects compared to the case where the present configuration is not provided, the position of the connecting member with respect to the image holding member in the axial direction is changed to change the position of the image holding member and the connecting member. The rigidity of the assembly can be easily changed.

  According to the invention described in claim 4, in addition to the above-described effect as compared with the case where the present configuration is not provided, further, the position of the connecting member in the axial direction with respect to the image holding body is changed to connect the image holding body. The rigidity of the member assembly can be reliably changed.

  According to the fifth aspect of the present invention, in addition to the above effects compared to the case where the present configuration is not provided, the position of the connecting member in the axial direction of the connecting member with respect to the image holding member is changed to change the position of the connecting member and the image holding member. The rigidity of the assembly can be automatically changed.

  According to the sixth aspect of the present invention, in addition to the above effects compared to the case where the present configuration is not provided, the position of the connecting member in the axial direction of the connecting member with respect to the image holding member can be changed to change the relationship between the image holding member and the connecting member. The rigidity of the assembly can be automatically changed according to the image forming speed.

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

[First embodiment]
1 to 11 are diagrams illustrating a first embodiment of an image forming apparatus according to the present invention.

  FIG. 1 is a schematic diagram illustrating an image forming apparatus according to the present embodiment. As shown in FIG. 1, an image forming apparatus 1 forms a toner image based on image information in an apparatus main body (not shown) and finally transfers the toner image to a sheet 9. A fixing device 30 that fixes the toner image by passing the paper 9 on which the toner image is transferred, and a paper feeding device 35 that supplies the paper 9 to the image forming device 10 are mainly equipped. A reference numeral 4 in the drawing is a control device that comprehensively controls the operation and the like of each component of the image forming apparatus 1.

  The image forming apparatus 10 can form and transfer a toner image using a known electrophotographic system, for example. Specifically, a cylindrical photosensitive drum (image carrier) 12 that is driven to rotate in the direction of arrow A is provided, and the surface of the photosensitive drum 12 is uniformly charged around the photosensitive drum 12. An exposure device comprising a charging device 13 provided with a charging roll, an LED array for irradiating the surface of the photosensitive drum 12 after charging with light based on image information to form an electrostatic latent image having a potential difference, a laser scanning device, etc. 14. A transfer device 16 including a developing device 15 that forms a toner image by transferring and adhering toner to the electrostatic latent image, a transfer roll 16a that transfers the toner image to the paper 9 supplied from the paper supply device 35, and the like. A cleaning device 17 having a cleaning blade for cleaning the toner remaining on the surface of the photosensitive drum 12 after the transfer by contacting the photosensitive drum 12 is mainly disposed.

  Among these, the photosensitive drum 12 is obtained by forming a photoconductive layer made of an organic photosensitive material on a drum-shaped substrate. The charging device 13 is installed such that a charging roll formed by forming a semiconductive elastic layer or the like on a conductive roll base material is brought into contact with the surface of the photosensitive drum 12 and is driven to rotate. A predetermined charging voltage is applied to the roll from a power supply device (not shown). The exposure device 14 is obtained by subjecting image information input from an external device such as a document reading device or a computer connected or equipped to the image forming apparatus 1 to an image processing apparatus (not shown) during image formation. An image signal is input.

  Further, the developing device 15 is equipped with a developing roll for transporting and supplying the contained toner to a developing position facing the photosensitive drum 12, and a predetermined power is supplied to the developing roll from a power supply device (not shown). The developing voltage is applied.

  The transfer device 16 applies a transfer bias in a direction in which the toner image on the photosensitive drum 12 is attracted by a bias power source (not shown) to transfer the toner image on the photosensitive drum 12 to the paper 9. In the transfer device 16 according to the present embodiment, a transfer pressure contact portion is formed by the photosensitive drum 12 and a transfer roll 16a disposed in pressure contact with the photosensitive drum 21. The transfer pressure contact portion formed between the photosensitive drum 12 and the transfer roll 16a is wound around a plurality of rollers (in this example, the drive roll 16b and the driven roll 16c) and rotated in a predetermined direction. A transfer conveyance belt 16d that is formed freely (in the clockwise direction in this example) and conveys the sheet 9 from the transfer unit to the fixing unit is inserted. The transfer conveyance belt 16d is rotationally driven by a drive roll 16b so that the rotation speed is synchronized with the transfer speed of the transfer device 16 (conveyance speed of the paper 9 when passing through the transfer pressure contact portion). The sheet 9 is adsorbed to the surface by electrostatic force, and the sheet 9 can be conveyed at high speed integrally with the transfer conveyance belt 16d. Note that the transfer roll 16a is driven to rotate by a transfer conveyance belt 16d.

  The cleaning device 17 includes a cleaning blade whose tip is in contact with the surface of the photosensitive drum 12 after transfer at a predetermined pressure, and a blade support member that supports the cleaning blade.

  The fixing device 30 includes a heating roll 32 that is heated to a predetermined temperature and is driven to rotate in the direction of an arrow, and a pressure roll 33 that is disposed in pressure contact with the heating roll 32 and rotates in a driven manner. It is a thing. Fixing is performed by heating and pressurizing the toner image and the like by introducing and passing the paper 9 on which the toner image has been transferred to the fixing pressure contact portion between the heating roll 32 and the pressure roll 33.

  The paper feeding device 35 is a paper feeding cassette 36 in which a plurality of paper sheets 9 to be supplied to the image forming device 10 are stacked and stored, and a feeding mechanism that sends out the paper 9 stored in the paper feeding cassette 36 one by one. 37 is mainly provided. A plurality of paper feed cassettes 36 are provided as necessary. Further, the paper feeding device 35 is a pair of paper transporting rollers 38a, 38b, 38c,... For transporting the paper 9 from the paper feeding cassette 36 to the transfer section (between the photosensitive drum 12 and the transfer device 16) of the image forming device 10. And a paper conveyance path composed of guide members and the like. The sheet conveyance path is also provided between the image forming device 10 and the fixing device 30 and between the fixing device 30 and the paper discharge unit (tray or the like) 39. For example, on the paper discharge side of the fixing device 30, a discharge roll pair 38 d for discharging and transporting the fixed paper 9 to the paper discharge unit 39 is installed.

  In FIG. 1, reference numeral 11 denotes a process cartridge that is detachable from the image forming apparatus 1. The process cartridge 11 in this embodiment includes process devices such as a photosensitive drum 12, a charging device 13, a developing device 15, and a cleaning device 17.

  Next, the photosensitive drum driving unit of the image forming apparatus according to the present invention will be described with reference to the drawings.

  FIG. 2 is a diagram illustrating a coupling member that is fitted to follow the rotation of the photosensitive drum and the photosensitive drum.

  2A is a front view of the connecting member 100, and FIG. 2B is a side view of the connecting member 100. FIG.

  The connecting member 100 is formed in a cylindrical shape having a predetermined length. On the outer peripheral surface of the connecting member 100, fitting protrusions 102 having a predetermined thickness and a predetermined distance from the lower end are provided at opposing positions. A circular protrusion 104 is provided at a predetermined position on the outer peripheral surface between the upper end of the connecting member 100 and the upper end of the fitting protrusion 102.

  FIG. 3 is a view showing the connecting member positioning member 106 that is fitted so as to follow the rotation of the driving shaft and the driving shaft and that can change the axial positional relationship with the connecting member 100.

  3A is a front view of the connecting member positioning member 106, and FIG. 3B is a side view of the connecting member positioning member 106. On the inner peripheral surface of the connecting member positioning member 106, a plurality of groove portions 108 having a predetermined length and a predetermined width are provided substantially parallel to the cylindrical axis from the upper end where the intervals are even. In addition, a positioning portion 110 is provided on the inner peripheral surface of the connecting member positioning member 106 at the abutting portion of the groove portion 108 in the circumferential direction perpendicular to the cylindrical axis.

  FIG. 4 is a diagram illustrating a state in which the connecting member and the connecting member positioning member are combined.

  In the connecting member 100 and the connecting member positioning member 106, the outer peripheral surface of the connecting member 100 fits into the inner peripheral surface of the connecting member positioning member 106, and the protrusion 104 of the connecting member 100 is inserted into the groove portion 108 of the connecting member positioning member 106. Thus, the protruding portion 104 of the connecting member 100 is formed to be positioned by the positioning portion 110 of the connecting member positioning member 106.

  FIG. 5 is a diagram illustrating a state in which the connecting member and the connecting member positioning member are incorporated in the photosensitive drum.

  In FIG. 5A, the connecting member positioning member 106 fitted to the shaft (drive shaft) 111 so as to follow the rotation of the shaft 111 contacts the end surface of the photosensitive drum 12 so as to come into contact with the end surface of the photosensitive drum 12. On the other hand, the connecting member 100 is fitted with a predetermined distance H apart, and the photosensitive drum driving unit has high rigidity.

  5B, the connecting member positioning member 106 fitted to the shaft (drive shaft) 111 so as to follow the rotation of the shaft 111 is brought into contact with the end surface of the photosensitive drum 12 so as to contact the end surface of the photosensitive drum 12. On the other hand, the photosensitive drum driving unit is fitted substantially flush, and the photosensitive drum driving unit has low rigidity.

  Next, an example in which the natural frequency is changed in the photosensitive drum driving unit of the image forming apparatus according to the present invention will be described.

  FIG. 6 is a diagram showing a configuration for measuring the natural frequency of the photosensitive drum driving unit of the image forming apparatus according to the present invention.

  FIG. 6A is a diagram illustrating a configuration for measuring the natural frequency of the photosensitive drum driving unit. This configuration includes the photosensitive drum 12, the connecting member 100, a gear (drive shaft gear) 112 that is provided on the drive shaft and drives the drive shaft, and a motor (drive source) 113 that drives the gear 112.

  FIG. 6B is a diagram illustrating a configuration in which the connecting member 100 is moved in the axial direction. This configuration includes a shaft 114, a connecting member 100 fitted to the shaft 114, a pin 116 that positions the connecting member 100 with respect to the shaft 114, and a coil spring 118 that biases the connecting member 100 toward the photosensitive drum 12 (not shown). Have.

  FIG. 7 shows data obtained by measuring frequency characteristics with the configuration of the photosensitive drum driving unit shown in FIG. 7A shows gain characteristics, and FIG. 7B shows phase characteristics.

  According to the characteristics of the photosensitive drum driving unit, the resonance frequency of the photosensitive drum driving unit becomes higher as the fitting between the photosensitive drum 12 and the connecting member 100 becomes deeper (the higher the rigidity of the photosensitive drum driving unit). ing.

  FIG. 8 shows data obtained by modeling the configuration of the photosensitive drum driving unit shown in FIG. 6 and measuring its frequency characteristics. FIG. 8A shows gain characteristics, and FIG. 8B shows phase characteristics.

  According to the modeling characteristics of the photosensitive drum driving unit, the resonance frequency of the photosensitive drum driving unit increases as the fitting between the photosensitive drum 12 and the connecting member 100 becomes deeper (the higher the rigidity of the photosensitive drum driving unit). It is high.

  FIG. 9 is a diagram showing the amount of displacement when a torsional load is applied to the photosensitive drum 12 and the connecting member 100 in the configuration of the photosensitive drum driving unit of FIG.

  FIG. 9A shows a case where the fit between the photosensitive drum 12 and the connecting member 100 is shallow (the stiffness of the photosensitive drum driving unit is small).

  FIG. 9B shows a case where the fit between the photoconductor drum 12 and the connecting member 100 is deep (the photoconductor drum drive unit has high rigidity).

  FIG. 10 is a diagram showing the relationship between the fit between the photosensitive drum and the connecting member, the torsional rigidity and the natural frequency of the photosensitive drum driving unit.

  According to the figure, the torsional rigidity of the photosensitive drum driving unit increases as the fitting between the photosensitive drum 12 and the connecting member 100 becomes deeper.

  Further, according to this drawing, the torsional rigidity of the photosensitive drum driving unit becomes smaller as the fitting between the photosensitive drum 12 and the connecting member 100 becomes shallower.

  The rigidity of the photosensitive drum driving unit is such that the photosensitive drum 12 is coaxially provided inside the photosensitive drum 12 and follows the rotation of the photosensitive drum 12 (image carrier connecting portion receiving portion). This also varies depending on the contact area between the photosensitive member flange and the connecting member 100 fitted so as to follow the rotation of the photosensitive member flange, and the thickness of the photosensitive member flange with which the connecting member 100 contacts.

  FIG. 11 is a diagram illustrating an example of the photoreceptor flange. FIG. 11A is a side view of the photosensitive drum driving unit in which the photosensitive flange 120 is incorporated. FIG. 11B is a perspective view of the photoreceptor flange 120.

  In this example, the photoconductor flange 120 is provided at one end of the photoconductor drum 12, the outer cylinder portion 122 that fits to follow the rotation of the photoconductor drum 12 and the photoconductor drum 12, the connecting member 100, and the connecting member 100. It is formed in the cylindrical shape which has the inner cylinder part 124 fitted so that it may follow rotation of this. The outer cylinder part 122 and the inner cylinder part 124 are connected by a rib 126. The inner cylinder portion 124 is formed so that the thickness in the circumferential direction differs from the one end surface in the axial direction.

  Therefore, according to this example, the contact area between the photosensitive member flange 120 and the connecting member 100 or the circumferential thickness of the photosensitive member flange 120 differs depending on the position of the connecting member 100 in the axial direction with respect to the photosensitive member flange 120. The rigidity of the drum drive unit will be different.

[Second Embodiment]
Next, a second embodiment of the image forming apparatus according to the present invention will be described. In the present embodiment, the same components as those shown in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 12 is a diagram showing a second embodiment of the image forming apparatus according to the present invention.

  FIG. 12A is a diagram illustrating a configuration of the second embodiment of the photosensitive drum driving unit. In this figure, the connecting member 100 is fixed to the photosensitive drum side shaft 200 with a through pin 202, and a plurality of through holes 204 are provided on the right side of the photosensitive drum side shaft 200. The drive side shaft 206 is provided to the device frame 208 via a bearing, and the gear 112 is provided between the device frames 208 so as to follow the rotation of the drive side shaft 206. In addition, a positioning hole 212 through which the fixing pin 210 passes is provided at the left end portion of the driving side shaft 206. The through hole 204 is formed so that the fixing pin 210 passes therethrough.

  In FIG. 12B, the fixing pin 210 passes through the positioning hole 212 and the rightmost through hole 204 of the light drum side shaft 200, and the distance from the left end of the apparatus frame 208 to the left end of the connecting member is L1. It is.

  In FIG. 12C, the fixing pin 210 passes through the positioning hole 212 and the leftmost through hole 204 of the light drum side shaft 200, and the distance from the left end of the apparatus frame 208 to the left end of the connecting member is L2. It is.

  The distance from the left end of the device frame 208 to the left end of the connecting member is L1> L2.

[Third embodiment]
Next, a third embodiment of the exposure apparatus and the image forming apparatus according to the present invention will be described. In the present embodiment, the same components as those shown in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 13 is a diagram illustrating a third embodiment of the image forming apparatus according to the present invention.

  13, the relative position of the coupling member 100 with respect to the photosensitive drum 12 (not shown) is changed under the control of the control unit 4.

  In FIG. 13, the photosensitive drum driving unit includes a shaft 300, a connecting member 100 provided to be movable in the axial direction with respect to the shaft 300, a connecting member flange 302 provided at the right end of the connecting member 100, and the connecting member 100. Are provided so as to follow the rotation of the shaft 300 between the device frame 208 and the device frame 208 that supports the shaft 300 via a bearing. The gear 112 and the solenoid 308 that sucks the connecting member 100 to change the relative position with respect to the photosensitive drum 12 (not shown).

  FIG. 13A shows a state before the solenoid 308 sucks the connecting member 100.

  FIG. 13B shows a state after the solenoid 308 sucks the connecting member 100.

FIG. 1 is a schematic diagram illustrating an image forming apparatus according to the first embodiment. FIG. 2 is a diagram illustrating a coupling member that is fitted to follow the rotation of the photosensitive drum and the photosensitive drum. FIG. 3 is a view showing the connecting member positioning member 106 that is fitted so as to follow the rotation of the driving shaft and the driving shaft and that can change the axial positional relationship with the connecting member 100. FIG. 4 is a diagram illustrating a state in which the connecting member and the connecting member positioning member are combined. FIG. 5 is a diagram illustrating a state in which the connecting member and the connecting member positioning member are incorporated in the photosensitive drum. FIG. 6 is a diagram showing a configuration for measuring the natural frequency of the photosensitive drum driving unit of the image forming apparatus according to the present invention. FIG. 7 shows data obtained by measuring frequency characteristics with the configuration of the photosensitive drum driving unit shown in FIG. FIG. 8 shows data obtained by modeling the configuration of the photosensitive drum driving unit shown in FIG. 6 and measuring its frequency characteristics. FIG. 9 is a diagram showing the amount of displacement when a torsional load is applied to the photosensitive drum 12 and the connecting member 100 in the configuration of the photosensitive drum driving unit of FIG. FIG. 10 is a diagram showing the relationship between the fit between the photosensitive drum and the connecting member, the torsional rigidity and the natural frequency of the photosensitive drum driving unit. FIG. 11 is a diagram illustrating an example of the photoreceptor flange. FIG. 12 is a diagram showing a second embodiment of the image forming apparatus according to the present invention. FIG. 13 is a diagram illustrating a third embodiment of the image forming apparatus according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1: Image forming apparatus, 4: Control part, 12: Photosensitive drum (image holding body), 100: Connection member, 104: Protrusion part, 106: Connection member positioning member, 108: Groove part, 111: Shaft (drive shaft) , 112: Gear (drive shaft gear), 113: Motor (drive source), 120: Photosensitive member flange (image carrier connecting portion receiving portion)

Claims (6)

An image carrier,
A drive shaft for driving the image carrier;
A drive source for driving the drive shaft;
A coupling member that fits to follow the rotation of the image carrier and the image carrier;
A coupling member positioning member that is fitted so as to follow the rotation of the drive shaft and the drive shaft, and that is capable of changing the positional relationship in the axial direction with the coupling member,
An image forming apparatus, wherein the rigidity of the assembly of the image holding member and the connecting member is changed by changing the position of the connecting member in the axial direction with respect to the image holding member. An image carrier,
A drive shaft for driving the image carrier;
A drive shaft gear provided on the drive shaft for driving the drive shaft;
A drive source for driving the drive shaft gear;
A coupling member that fits to follow the rotation of the image carrier and the image carrier;
A coupling member positioning member that is fitted so as to follow the rotation of the drive shaft and the drive shaft, and that is capable of changing the positional relationship in the axial direction with the coupling member,
An image forming apparatus, wherein the rigidity of the assembly of the image holding member and the connecting member is changed by changing the position of the connecting member in the axial direction with respect to the image holding member.   The connecting member and the connecting member positioning member include a protrusion provided on the outer surface of the connecting member, and the protrusion provided on the inner surface of the connecting member positioning member and having different axial distances from one end surface and the connecting member. The image forming apparatus according to claim 1, wherein the positional relationship with a plurality of groove portions fitted to follow the rotation of the image forming portion is changed.   An image carrier connecting portion receiving portion that fits so that the connecting member follows the rotation of the image holding member is provided on the image holding member, and the image holding member connecting portion receiving portion is axially thick from one end surface. The image forming apparatus according to claim 1, wherein the image forming apparatuses are different from each other.   The image forming apparatus according to claim 1, wherein the connecting member is formed so that a positional relationship with the connecting member positioning member can be changed by control of a control unit.   The image forming apparatus according to claim 5, wherein the control unit controls the position of the connecting member in accordance with an image forming apparatus speed.

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