JP2015092096A - Rotating body driving device and image forming device with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve suitable drive transmission to a rotating body while expanding a permissible range of a component manufacturing error.SOLUTION: A photoreceptor driving device 10Y includes a drum shaft 50Y rotationally driven by receiving driving force from a drive motor 20Y provided on a copying machine body, a photoreceptor drum 1Y detachable along a drum shaft direction with respect to the copying machine body, a first external gear 83 provided on the drum shaft, a second internal gear 87 provided on the photoreceptor drum, and an intermediate transmission component 85 having a first internal gear 84 meshed with the first external gear and a second external gear 86 meshed with the second internal gear and supported by the first external gear and the second internal gear. The photoreceptor drum has shaft fitting holes 55a and 55b into which the drum shaft is inserted in attachment to the copying machine body, and the photoreceptor drum is positioned on the drum shaft by inserting the drum shaft into the shaft fitting holes.

Description

  The present invention relates to a rotating body driving device that transmits a driving force from a driving source to a rotating body provided in an image forming apparatus to drive the rotating body, and an image of a printer, a facsimile, a copying machine, or the like provided with the rotating body driving device. The present invention relates to a forming apparatus.

  An electrophotographic image forming apparatus includes a rotating body such as a photoconductor and a developing roller, and rotates the rotating body to form an image. Many of these rotating bodies are configured to be detachable from the main body of the image forming apparatus so that they can be replaced. For this reason, the drive transmission means for transmitting the driving force from the drive source of the image forming apparatus main body to the rotating body is provided with a coupling portion for detachably connecting the two.

  In Patent Document 1 and Patent Document 2, the output shaft on the drive source side and the input shaft on the rotating body side are arranged on the same axis, and the gear on the output shaft on the drive source side and the input on the rotating body side are placed between both shafts. A drive transmission device having an intermediate transmission component with a gear meshing with both of the gears on the shaft is disclosed. This drive transmission device includes a first-stage coupling portion where the output gear on the output shaft on the drive source side and the input gear on the intermediate transmission component mesh with each other, the output gear on the intermediate transmission component and the input shaft on the rotating body side. A two-stage coupling configuration having a second-stage coupling portion that meshes with the input gear is adopted. The intermediate transmission component is configured to be supported only by the output shaft on the drive source side and the input shaft on the rotating body side during drive transmission. As a result, errors such as shaft eccentricity and shaft deflection angle between the output shaft on the drive source side and the input shaft on the rotating body, and eccentricity and distortion of the gears on the output shaft on the driving source side and the input shaft on the rotating body side, etc. Even if there is an error or the like, the intermediate transmission part between the two axes is inclined, so that the error can be absorbed and the driving force on the driving source side can be transmitted to the rotating body side appropriately.

  In Patent Document 3, a shaft shaft (drive output shaft) connected to a drive source of the image forming apparatus main body is inserted into shaft holes (insertion holes) of both end flange portions provided at both ends of the photosensitive drum (rotating body). ) Is provided so that the photosensitive drum is detachable from the image forming apparatus main body. In this drive transmission device, when the shaft shaft passes through the photosensitive drum, the external gear provided on the shaft shaft meshes with the internal gear formed on the flange portion on one end side of the photosensitive drum. As a result, the rotational driving force of the shaft is transmitted to the photosensitive drum. In this drive transmission device, the flanges on both ends of the photosensitive drum are positioned on a common shaft axis, so that errors in shaft eccentricity and shaft deflection between the output shaft on the drive source side and the input shaft on the rotator side. Does not exist. Therefore, the adverse effect of this error on the transmission of driving force can be eliminated.

  As described in Patent Document 1 and Patent Document 2, both conventional drive transmission devices having a two-stage coupling configuration using an intermediate transmission component include an output shaft on the drive source side and a rotating body side. The input shaft was constituted by a separate member. Therefore, it is possible to absorb all of the shaft eccentricity error, shaft deflection error, and component manufacturing error (those that cause errors other than shaft eccentricity error and shaft deflection error due to individual component manufacturing errors) by the intermediate transmission component. Necessary. However, there is a limit to the total error tolerance that can be absorbed by the intermediate transmission component. Therefore, it is necessary to keep these errors within a narrow tolerance so that the total error of the shaft eccentricity error, shaft deviation error, and part manufacturing error is within the limited tolerance, and the manufacturing cost increases. It was a factor to make.

  On the other hand, in the drive transmission device described in Patent Document 3, as described above, the output shaft on the drive source side and the input shaft on the rotating body side are configured by a common shaft shaft. There is no error in shaft eccentricity or shaft deflection angle between the shaft and the input shaft on the rotating body side. In such a drive transmission device, although there is some adverse effect on drive transmission due to component manufacturing errors, the adverse effects have been eliminated by reducing the component manufacturing errors themselves. However, reducing the component manufacturing error leads to an increase in manufacturing cost.

  The present invention has been made in view of the above background, and an object of the present invention is to provide a component provided with a coupling portion that detachably connects a drive source of the image forming apparatus main body and a rotating body. It is an object of the present invention to provide a driving force transmission device capable of appropriately transmitting a driving force to a rotating body while widening an allowable range of manufacturing errors, and an image forming apparatus including the driving force transmission device.

  In order to achieve the above object, the present invention provides a drive output shaft that rotates by receiving a driving force from a drive source provided in an image forming apparatus main body, and an axial direction of the drive output shaft with respect to the image forming apparatus main body. A rotating body detachable along the driving output shaft, a driving side coupling part provided on the driving output shaft, a driven side coupling part provided on the rotating body, and a first side engaging with the driving side coupling part. A first intermediate coupling portion and a second intermediate coupling portion that engages with the driven side coupling portion; and an intermediate transmission component supported by the driving side coupling portion and the driven side coupling portion. The rotating body has an insertion hole through which the drive output shaft is inserted when the rotating body is attached to the image forming apparatus main body, and the drive output shaft is inserted into the insertion hole of the rotating body. This By and characterized by being configured such that the rotating body on the drive output shaft is positioned.

  In the present invention, the intermediate transmission component is supported by the drive side coupling portion on the drive output shaft and the driven side coupling portion on the rotating body, and errors that adversely affect the drive transmission are caused by this intermediate transmission. Absorbed by tilting parts. The rotating body that can be attached to and detached from the image forming apparatus main body is positioned on the drive output shaft by inserting a drive output shaft provided in the image forming apparatus main body into the insertion hole of the rotating body. Therefore, no shaft eccentricity error occurs between the rotating body side and the driving side.

  In the conventional configuration used in the rotating body drive device in which the output shaft on the driving source side and the input shaft on the rotating body side are configured as separate members, the error range (allowable range) in which this shaft eccentricity error can be absorbed is also limited. It was absorbed by the intermediate transmission parts. On the other hand, in the present invention, as described above, since the shaft eccentricity error between the rotating body side and the drive side does not occur, it is not necessary to absorb this shaft eccentricity error by the intermediate transmission component. Therefore, there is a margin in the allowable range of the intermediate transmission component, and the allowable range of the component manufacturing error can be widened accordingly. On the other hand, when compared with the conventional configuration in which the rotating body is positioned on the driving output shaft by inserting the driving output shaft through the insertion hole of the rotating body, the present invention has a component manufacturing error due to the intermediate transmission component. Can be absorbed. Therefore, appropriate drive transmission can be realized while allowing a wider part manufacturing error than in the conventional configuration in which such an intermediate transmission part does not absorb the part manufacturing error. Therefore, according to the present invention, an allowable error range can be expanded compared to any conventional configuration.

  As described above, according to the present invention, in the configuration in which the coupling unit that detachably connects the drive source of the image forming apparatus main body and the rotating body is provided, the tolerance of the part manufacturing error is widened, and the rotating body is moved. Thus, it is possible to obtain an excellent effect of enabling appropriate drive transmission.

1 is an overall schematic diagram of a copier according to an embodiment. FIG. 2 is a cross-sectional view illustrating a schematic configuration of a photoreceptor driving device in the copier. It is sectional drawing which shows the structure of the injection mold for intermediate | middle transmission components in the photoconductor drive device. It is a top view which shows the molded intermediate | middle transmission component. It is the perspective view which expanded the tooth | gear part of the 2nd external gear in the same intermediate | middle transmission component. 11 is a cross-sectional view illustrating a schematic configuration of a photosensitive member driving device in a state where a photosensitive drum unit is not attached to a copying machine main body in Modification 1. FIG. FIG. 2 is a cross-sectional view showing a schematic configuration of the photoreceptor driving device in a state where the photoreceptor drum unit is mounted on the copying machine main body. 11 is a cross-sectional view illustrating a schematic configuration of a photoconductor driving device in a state where a photoconductor drum unit is mounted on a copying machine main body in Modification 2. FIG. In Modification 2, it is a cross-sectional view when the front side taper portion is cut along a cross section orthogonal to the axial direction of the drum shaft. FIG. 10 is a cross-sectional view illustrating a schematic configuration of a photoconductor driving device according to Modification 3. 10 is a cross-sectional view illustrating a schematic configuration of a photoconductor driving device according to Modification 4. FIG. FIG. 10 is a cross-sectional view illustrating a schematic configuration of a rear drum flange portion and a drive side regulating member that are in contact with an intermediate transmission part of a photosensitive member driving device according to Modification 5. FIG. 10 is a cross-sectional view illustrating a schematic configuration of a photoconductor driving device according to Modification 6. It is an expanded sectional view which shows the example which fixed the cover member of the modification 6 to the intermediate transmission components side. FIG. 11 is a cross-sectional view showing an example in which a disc-shaped cover member without bending is used as a cover member of Modification 6; (A) And (b) is an expanded sectional view which shows a mode that the cover member deform | transforms by contact with intermediate transmission components.

Hereinafter, an embodiment in which the present invention is applied to an electrophotographic color copier as an image forming apparatus will be described with reference to the drawings.
First, an overall outline of the copying machine 500 of this embodiment will be described.
FIG. 1 is an overall schematic diagram of a copying machine 500 according to the present embodiment.
The copier 500 in the present embodiment is a so-called tandem image forming apparatus, and employs a dry two-component developing system using a dry two-component developer. The copying machine 500 includes a copying machine main body 100, a paper feed table 200 on which the copying machine main body 100 is placed, a scanner 300 mounted on the copying machine main body 100, and an automatic document feeder 400 mounted on the scanner 300. Yes.

  The copier 500 receives image data that is image information read from the scanner 300 or print data from an external device such as a personal computer to perform image forming processing. As shown in the figure, the copying machine main body 100 carries a cylindrical latent image as four rotated bodies for each color of yellow (Y), magenta (M), cyan (C), and black (Bk). The photosensitive drums 1Y, 1M, 1C, and 1Bk, which are bodies, are arranged in parallel. These photosensitive drums 1Y, 1M, 1C, and 1Bk are arranged along the belt moving direction so as to contact the endless belt-shaped intermediate transfer belt 5 supported by a plurality of rotatable rollers including a driving roller. Is arranged.

  Further, around the photosensitive drums 1Y, 1M, 1C, and 1Bk, chargers 2Y, 2M, 2C, and 2Bk, developing devices 9Y, 9M, 9C, and 9Bk corresponding to the respective colors, and cleaning devices 4Y, 4M, 4C, and 4B, respectively. Electrophotographic process members such as 4Bk and static elimination lamps 3Y, 3M, 3C, and 3Bk are arranged in the order of processes. An optical writing device 17 is provided above each photosensitive drum 1. In addition, primary transfer rollers 6Y, 6M, 6C, and 6Bk, which are primary transfer units, are disposed at positions facing each other through the intermediate transfer belt 5 of each photosensitive drum 1.

  The intermediate transfer belt 5 is stretched around stretching rollers 11, 12, 13 and a tension roller 14, and is driven to rotate by the rotation of the stretching roller 12, which is a driving roller that is rotationally driven by a drive source (not shown). . A belt cleaning device 19 is provided at a position where the stretching roller 13 faces through the intermediate transfer belt 5 to remove residual toner remaining on the intermediate transfer belt 5 after the secondary transfer. The stretching roller 11 is a secondary transfer facing roller that faces the secondary transfer roller 7 that is a secondary transfer unit, and is interposed between the secondary transfer roller 7 and the secondary transfer roller 7 via the intermediate transfer belt 5. Forming part.

  On the downstream side of the secondary transfer nip portion in the transfer sheet conveyance direction, a transfer sheet conveyance belt 15 stretched around a tension roller pair 16 is provided, and the transfer sheet on which the toner image is secondarily transferred is fixed to the fixing device. Transport to 18. The fixing device 18 includes a fixing roller pair 8, and heat and pressure are applied at the fixing nip portion to fix the unfixed toner image on the transfer paper.

Next, the copying operation of the copying machine 500 in this embodiment will be described.
When a full-color image is formed by the copying machine 500 according to the present embodiment, first, a document is set on the document table 401 of the automatic document feeder 400. Alternatively, the automatic document feeder 400 is opened, a document is set on the contact glass 301 of the scanner 300, and the automatic document feeder 400 is closed and pressed. Thereafter, when the user presses a start switch (not shown), when the document is set on the automatic document feeder 400, the document is conveyed onto the contact glass 301. Then, the scanner 300 is driven and the first traveling body 302 and the second traveling body 303 start traveling. Thereby, the light from the first traveling body 302 is reflected by the document on the contact glass 301, and the reflected light is reflected by the mirror of the second traveling body 303 and guided to the reading sensor 305 through the imaging lens 304. . In this way, the image information of the original is read.

  When the start switch is pressed by the user, a motor (not shown) is driven, and the stretching roller 12 as a driving roller is driven to rotate, so that the intermediate transfer belt 5 is driven to rotate. At the same time, the photoconductor drum 1Y is uniformly charged by the charger 2Y while being driven to rotate in the direction of the arrow in the drawing by a photoconductor drive device 10Y (not shown) described later. Thereafter, a light beam Ly from the optical writing device 17 is irradiated to form a Y electrostatic latent image on the photosensitive drum 1Y. This Y electrostatic latent image is developed with Y toner in the developer by the developing device 9Y. During development, a predetermined developing bias is applied between the developing roller and the photosensitive drum 1Y, and the Y toner on the developing roller is electrostatically attracted to the Y electrostatic latent image portion on the photosensitive drum 1Y.

  The Y toner image developed and formed in this way is conveyed to a primary transfer position where the photosensitive drum 1Y and the intermediate transfer belt 5 come into contact with the rotation of the photosensitive drum 1Y. At the primary transfer position, a predetermined bias voltage is applied to the back surface of the intermediate transfer belt 5 by the primary transfer roller 6Y. The Y toner image on the photosensitive drum 1Y is drawn toward the intermediate transfer belt 5 by the primary transfer electric field generated by this bias application, and is primarily transferred onto the intermediate transfer belt 5. Thereafter, similarly, the M toner image, the C toner image, and the Bk toner image are also primarily transferred so as to sequentially overlap the Y toner image on the intermediate transfer belt 5. The transfer residual toner remaining on the intermediate transfer belt 5 after the secondary transfer is removed by the belt cleaning device 19.

  When the user presses the start switch, the paper feed roller 202 of the paper feed table 200 corresponding to the transfer paper selected by the user rotates, and the transfer paper is sent out from one of the paper feed cassettes 201. The transferred transfer paper is separated into one sheet by the separation roller 203 and enters the paper feed path 204, and is transported to the paper feed path 101 in the copying machine main body 100 by the transport roller 205. The transfer paper conveyed in this way is stopped when it strikes the registration roller 102. When using transfer paper that is not set in the paper feed cassette 201, the transfer paper set on the manual feed tray 105 is fed out by the paper feed roller 104 and separated into one sheet by the separation roller 108, and then the manual paper feed path. It is conveyed through 103. Then, it stops when it hits the registration roller 102.

  The toner images having the four colors superimposed on the intermediate transfer belt 5 are conveyed to a secondary transfer position facing the secondary transfer roller 7 as the intermediate transfer belt 5 rotates. Further, the registration roller 102 starts to rotate in accordance with the timing at which the composite toner image formed on the intermediate transfer belt 5 as described above is conveyed to the secondary transfer position, and the transfer paper is moved to the secondary transfer position. Transport. At this secondary transfer position, a predetermined bias voltage is applied to the back surface of the transfer paper by the secondary transfer roller 7, and due to the secondary transfer electric field generated by the bias application and the contact pressure at the secondary transfer position, The toner image on the intermediate transfer belt 5 is secondarily transferred onto the transfer paper at once. Thereafter, the transfer paper onto which the toner image has been secondarily transferred is conveyed to the fixing device 18 by the transfer paper conveying belt 15 and subjected to fixing processing by the fixing roller pair 8 provided in the fixing device 18. The transfer sheet on which the fixing process has been performed is discharged and stacked in a discharge tray 107 provided outside the apparatus by a discharge roller pair 106.

Next, an example in which the rotational driving device according to the present invention is applied to a photosensitive member driving device that rotationally drives a photosensitive drum as a member to be rotated will be described with reference to the drawings.
FIG. 2 is a cross-sectional view showing a schematic configuration of the photoconductor driving device in the present embodiment.
Since each of the photosensitive drums 1Y, 1M, 1C, and 1Bk is rotationally driven by the photosensitive member driving device having the same configuration, the photosensitive member driving device 10Y corresponding to the photosensitive drum 1Y will be described below as an example.
The photosensitive drum 1Y is held by a resin-made photosensitive drum unit 54Y. When the photosensitive drum 1Y is attached to or detached from the copying machine main body for replacement or the like, the photosensitive drum unit 1Y is attached or detached together. The photosensitive drum 1Y includes a drum cylinder (photosensitive drum main body) 52Y, a disc-shaped front side drum flange portion 53b, and a disc-shaped rear side drum flange portion 53a. The front side drum flange portion 53b and the rear side drum flange portion 53a are attached so as to be fitted into both end portions of the drum cylinder 52Y.

  Shaft fitting holes 55a and 55b are formed in the central portions of the front drum flange portion 53b and the rear drum flange portion 53a to fit the drum shaft 50Y which is the drive output shaft of the photoreceptor driving device 10Y. By inserting the photosensitive drum unit 54Y that supports the photosensitive drum 1Y into the copying machine main body along the rotation axis direction of the photosensitive drum 1Y, the drum shaft 50Y of the photosensitive drum driving device 10Y is connected to both side flange portions of the photosensitive drum 1Y. It is inserted into the shaft fitting holes 55a and 55b of 53a and 53b. The front drum flange portion 53b and the rear drum flange portion 53a are supported with a gap (provided by play) with respect to the side plate frame 56 provided in the photosensitive drum unit 54Y. Accordingly, when the photosensitive drum unit is mounted on the copying machine main body, the position of the photosensitive drum 1Y is positioned by the drum shaft 50Y.

  The photoreceptor driving device 10Y of this embodiment includes a drive motor 20Y, a motor shaft gear 72 that rotates integrally with the motor shaft 20Ya of the drive motor 20Y, and a drive shaft gear 71 that rotates integrally with the drum shaft 50Y. The drive motor 20Y is attached to the drive frame 63 of the copying machine main body. The motor shaft gear 72 is composed of an external gear, and is arranged so as to mesh with a drive shaft gear 71 that is also composed of an external gear. The drive shaft gear 71 is fixed so as not to rotate with respect to the drum shaft 50Y, and transmits the rotational driving force transmitted from the drive motor 20Y through the motor shaft gear 72 to the drum shaft 50Y. The drum shaft 50Y is rotatably supported by a bearing attached to the drive frame 63 and a bearing attached to the main body frame 62 of the copying machine main body.

  Since the drum shaft 50Y employs a metal shaft having an outer diameter of 10 mm or more, the shaft rigidity is high, and the amount of bending with respect to the photosensitive drum unit 54Y made of resin is small. As described above, since the support of the photosensitive drum unit 54Y is stable, it is difficult for low-frequency vibrations to occur during image formation, and periodic density unevenness of the image called banding can be suppressed.

  In the present embodiment, a first external gear 83 as a male spline member constituting the first-stage spline coupling is installed on the drum shaft 50Y. The first external gear 83 is made of metal by cutting or sintering, and is press-fitted and fixed to the drum shaft 50Y. On the other hand, a second internal gear 87 as a female spline member constituting the second-stage spline coupling is formed on the rear drum flange portion 53a. An intermediate transmission component 85 is interposed between the first external gear 83 and the second internal gear 87, and the rotational driving force from the first external gear 83 is transmitted to the second internal gear 87.

  The intermediate transmission component 85 is formed of a substantially cylindrical member, and a first internal gear 84 as a female spline member forming the first-stage spline coupling is formed on the rear side (photoconductor drive device 10Y side). Has been. A second external gear 86 as a male spline member constituting the second-stage spline coupling is formed on the front side (drum cylinder 52Y side) of the intermediate transmission component 85. The intermediate transmission component 85, the first internal gear 84, and the second external gear 86 are integrally formed by resin injection molding. By the integral molding, the rotation transmission rigidity of the intermediate transmission component 85 can be increased, and a resin component with a low mass production cost can be obtained. If the intermediate transmission component 85, the first internal gear 84, and the second external gear 86 are configured by combining a plurality of components, the rotational transmission rigidity tends to be low at the connection portion.

  The second external gear 86 of the intermediate transmission component 85 is formed outside the cylindrical outer peripheral surface of the first internal gear 84. That is, the diameter of the root circle of the second external gear 86 is designed to be larger than the diameter of the cylindrical outer circumference of the first internal gear 84 portion. This has the following two advantages from the viewpoint of securing the rotational transmission rigidity of the intermediate transmission component 85.

  The first point is that it becomes easy to form a crowning-shaped tooth profile into the second external gear 86 or the first internal gear 84 by resin injection molding. By adopting the crowning shape, the allowable range of axial misalignment caused mainly by component manufacturing errors is increased. Further, even if the shaft misalignment occurs, the teeth on the entire circumference stably mesh with each other, so that the rotation transmission rigidity is improved. In addition, crowning-shaped teeth can be integrally formed. As will be described in detail later, such a structure can injection mold a crowned tooth profile by setting the mold division of the resin molding die at the center in the tooth width direction.

  Secondly, the transmission rigidity of the second-stage spline coupling can be sufficiently increased. By increasing the diameter of the spline gear, the tooth surface load is reduced because the spline gear is away from the center of rotation, and the number of teeth can be greatly increased, so that the rotation transmission rigidity is increased. If the rotation transmission rigidity of the spline gear in the second stage spline coupling is sufficiently larger than that in the first stage, the rotation transmission rigidity equivalent to that of the conventional serration coupling can be realized.

  By adopting a crowned gear, the center deviation due to the component error between the first external gear 83 press-fitted into the drum shaft 50Y and the second internal gear 87 on the photosensitive drum 1Y side, and the shaft fitting hole of the flange portion 53 An effect of absorbing misalignment such as axial misalignment due to a position error can be obtained. This effect can be obtained if either the external gear or the internal gear that meshes with each stage of the two-stage spline coupling as in this embodiment is a crowning shape. Therefore, in the present embodiment, the first external gear 83 that constitutes the first-stage spline coupling and the second internal gear 87 that constitutes the second-stage spline coupling are spur gears, and are formed in the intermediate transmission component 85. The first internal gear 84 and the second external gear 86 are crowned.

Next, the coupling of the coupling unit when the image forming unit is mounted on the copying machine main body will be described.
In the state before the mounting, the rear drum flange portion 53a is held by a photosensitive drum holding frame 57 provided in the photosensitive drum unit 54Y with a slight gap therebetween. As described above, since the photosensitive drum 1Y is held with play with respect to the photosensitive drum unit 54Y, components such as a developing roller around the photosensitive drum, the photosensitive drum 1Y, and the like are attached to the copying machine main body. The surface of the photosensitive drum is prevented from being damaged. After the mounting, the photosensitive drum 1Y is positioned by the drum shaft 50Y, and the rear drum flange portion 53a is separated from the photosensitive drum holding frame 57.

  Since there is no support component for supporting the intermediate transmission component 85, the intermediate transmission component 85 is in a floating support state regardless of the mounted state. However, in this embodiment, the intermediate transmission component 85 is moved in the thrust direction of the drum shaft 50Y so that the intermediate transmission component 85 is not dropped before the mounting or the coupling is not disengaged after the mounting. It becomes the composition which regulates. Specifically, the intermediate transmission component 85 is configured to be sandwiched between the rear drum flange portion 53 a and the side plate frame 56. With such a configuration, the intermediate transmission component 85 is restricted from thrust movement toward the front side by the rear drum flange portion 53 a and is restricted from thrust movement toward the rear side by the side plate frame 56. Further, since the second external gear 86 is in mesh with the second internal gear 87 formed on the rear drum flange 53a, the intermediate transmission component 85 is also restricted from moving in the radial direction.

  At the time of mounting, the drum shaft 50Y passes through the inside of the photosensitive drum 1Y by sliding the photosensitive drum unit 54Y in the thrust direction with respect to the copying machine main body. The drum shaft 50Y comes into contact with the inner peripheral surfaces of the shaft fitting holes 55a and 55b of the both side flange portions 53a and 53b, and the photosensitive drum 1Y is positioned. Further, the first external gear 83 passes through the central opening of the side plate frame 56 and meshes with the first internal gear 84 of the intermediate transmission component 85. The central opening of the side plate frame 56 engages with a positioning bearing 51 for positioning the photosensitive drum unit 54Y with respect to the copying machine main body. Accordingly, the entire photosensitive drum unit 54Y is supported coaxially with the drum shaft 50Y.

  In order to ensure the ease of assembly of the photosensitive drum unit 54Y, it is desirable that the tooth shapes at the end portions in the width direction of the gears 83, 84, 86, 87 constituting the two-stage spline coupling be tapered. In particular, the end portion on the photosensitive drum 1Y side in the tooth width direction of the first external gear 83 connected at the time of mounting and the end portion on the driving device 10Y side of the first internal gear 84 have a sharp shape with a sufficient tooth width region. The taper shape is set so that the standard tooth profile is gradually formed. Thus, when the photosensitive drum unit 54Y is mounted on the copying machine main body, both gears 83 and 84 of the first-stage spline coupling can be easily engaged.

Next, a method for manufacturing the intermediate transmission component 85 by molten resin injection molding will be described.
FIG. 3 is a cross-sectional view showing the structure of an injection mold for the intermediate transmission component 85.
FIG. 4 is a plan view showing the formed intermediate transmission component 85.
The mold 90 includes a fixed upper mold 91 and a movable lower mold 92, and a cavity 93 is formed in a portion sandwiched between the gap of the upper mold 91 and the gap of the lower mold 92. . The cavity 93 is a space mainly formed in a cylindrical shape, and an intermediate transmission component 85 that is a cylindrical plastic molded product is formed by injecting molten resin into the cavity 93 and cooling and solidifying. .

  The upper die 91 is formed with a flow path 95 through which molten resin is supplied and a plurality of pin gates 96 through which the molten resin supplied through the flow path 95 is injected into the cavity 93. The upper mold 91 and the lower mold 92 are each formed with a plurality of communication holes 97 communicating with the inside of the cavity 93. These communication holes 97 are connected to a compressed gas supply source 98. The inner diameter dimension of the communication hole 97, more specifically, the inner diameter dimension of the portion of the communication hole 97 that opens to the cavity 93 is 0.001 to 0.5 mm.

  The intermediate transmission component 85 formed by the mold 90 is transferred by the cylindrical main body 89 and the tooth shape formed at the inner peripheral end of the cavity 93 which is the inner peripheral side of the cylindrical main body 89. The first external gear 84, the second external gear 86 transferred by the tooth shape formed on the outer peripheral side end of the cavity 93, which is the outer peripheral side of the cylindrical main body 89, and the second external gear 86 are cylindrical. It is composed of a disk-shaped support side plate 88 integrally connected to the main body 89.

  In the present embodiment, in order to form the crowned first internal gear 84 and the second external gear 86, a mold 90 in which a mold dividing surface is set at locations indicated by reference numerals 94a and 94b in FIG. 3 is employed. ing. The crowning shape here means having a crowning shape in the tooth thickness direction. Specifically, with reference to FIG. 5, the tooth thickness of the second external gear 86 is such that the tooth thickness at the central portion of the tooth width is the maximum and the tooth thickness at both ends in the tooth width direction is the minimum. is there.

  In order to injection mold such a crowned tooth profile, it is necessary to perform mold division at a position where the tooth thickness is maximum. For this reason, tooth forms obtained by halving each tooth portion of the second external gear 86 in the tooth width direction are formed by transfer molding using the upper mold 91 and the lower mold 92, respectively. A mold dividing line 99 in FIG. 5 indicates a boundary (mold dividing line) between the upper mold 91 and the lower mold 92. The same applies to the crowning shape of the first internal gear 84. In FIG. 3, the mold dividing line of the second external gear 86 is indicated by reference numeral 94b, and the mold dividing line of the first internal gear 84 is indicated by reference numeral 94a.

  In this embodiment, since it is a complicated mold dividing line in order to mold the crowned tooth profile at two locations, the mold release property of the cylindrical plastic molded product tends to be low. If there is a tendency that the releasability is low, a slide core may be adopted for the transfer portion that forms the inside of the cylindrical main body 89 and half of the first internal gear 84.

  At the time of molding the intermediate transmission component 85, which is a cylindrical plastic molded product performed using the mold 90 described above, molten resin flows through the flow path 95 and is supplied from the pin gate 96 to the cavity 93. Is injected into. The molten resin injected into the cavity 93 spreads radially around each pin gate 96. For this reason, variations occur in the timing at which the molten resin injected into the cavity 93 reaches the outer peripheral side end or the inner peripheral side end of the cavity 93. And in the location where the arrival timing of the molten resin is late at the outer peripheral side end or the inner peripheral side end of the cavity 93, the filling amount of the molten resin becomes insufficient. This is because the molten resin injected into the cavity 93 is cooled and solidified over time.

  Therefore, in the present embodiment, when the resin pressure reaches a predetermined value during the cooling and solidification process, the compressed gas supply source 98 is driven to communicate with the side surface portion of the cylindrical main body 89. A compressed gas is blown from the hole 97 into the cavity 93. By blowing this compressed gas, a retracting recess is formed in a portion of the side surface portion of the cylindrical main body 89 facing the communication hole 97. By forming such a recess recess, an amount of molten resin corresponding to the volume of the recess recess is additionally filled in the outer peripheral side end and the inner peripheral end of the cavity 93. The position where the recess recess is formed is substantially the center of the two adjacent pin gates, and the molten resin injected into the cavity 93 reaches the outer peripheral end or inner peripheral end of the cavity 93. Since the position corresponding to the location where the filling amount of the molten resin is insufficient and the filling amount of the molten resin is insufficient, the molten resin is additionally filled in the portion where the filling amount of the molten resin is insufficient. Thereby, the variation in the filling amount of the molten resin filled in the outer peripheral side end and the inner peripheral side end of the cavity 93 can be corrected and made substantially uniform, and the first outer peripheral side transfer portion of the cylindrical body 89 can be corrected. 2. It is possible to prevent the corrugation from occurring in the tooth shape of the external gear 86 and the first internal gear 84 of the inner peripheral transfer portion, and to obtain an intermediate transmission component 85 having a gear with high molding accuracy.

  It should be noted that by adjusting the driving timing and output of the compressed gas supply source 98, the amount and timing of applying compressed gas can be adjusted as appropriate, thereby adjusting the formation region and depth of the recess recess. Can do. For this reason, the volume of the recess recess can be adjusted, and the amount of the molten resin that is additionally filled into the outer peripheral side end and the inner peripheral end of the cavity 93 can be adjusted. By this adjustment, it is possible to more surely prevent the occurrence of wavy irregularities on the second external gear 86 of the outer peripheral transfer portion of the cylindrical main body and the first internal gear 84 of the inner peripheral transfer portion, and the tooth profile forming accuracy The intermediate transmission component 85 having a higher height can be obtained.

  Further, since the inner diameter of the communication hole 97 is as small as 0.001 to 0.5 mm, the molten resin injected into the cavity 93 does not enter the communication hole 97 and the molten resin enters the communication hole 97. Occurrence of burrs caused by this is prevented.

Next, a specific configuration of the intermediate transmission component 85 will be described in detail.
The rotational driving force of the drum shaft 50Y is transmitted from the metal first external gear 83 press-fitted and fixed to the drum shaft 50Y to the first internal gear 84 of the intermediate transmission component 85. The rotational driving force transmitted to the first internal gear 84 is transmitted to the second external gear 86 via the cylindrical main body 89 and the support side plate 88. Since the first internal gear 84 and the second external gear 86 are formed at positions separated in the thrust direction (photoreceptor axial direction), the cylindrical main body 89 undergoes torsional deformation. In order to reduce the torsional deformation as much as possible, the thickness of the cylindrical main body 89 is about 2 mm to 2.5 mm. The thicker one can prevent torsional deformation, but this level is suitable because it is difficult to uniformly fill the teeth with resin.

  The supporting side plate 88 has a thickness of about 1.5 mm. If deformation during driving transmission is large, reinforcing ribs may be additionally formed on the support side plate 88. The thickness of the reinforcing rib at this time may be set to about 1.5 mm, for example.

  For the first external gear 83 and the first internal gear 84 constituting the first-stage spline coupling, for example, a tooth profile with a tooth width of 5 mm, a module 1, and the number of teeth of 20 can be adopted. About the size of the gear, considering the operability when the drum shaft 50Y to which the first external gear 83 is fixed is assembled to the main body frame 62, the size of the gear is approximately the same as the outer size of the bearing that supports the drum shaft 50Y on the main body frame 62. Designed to be The crowning shape of the first internal gear 84 was such that the tooth thickness at the tooth end portion was reduced by about 0.2 mm with respect to the tooth thickness at the center portion.

  For the second external gear 86 and the second internal gear 87 constituting the second-stage spline coupling, for example, a tooth profile with a tooth width of 5 mm, a module 1, and a number of teeth of 54 is adopted as in the first stage. be able to. The size of the gear is designed to be approximately the same as the central opening of the rear drum flange 53a of the photosensitive drum 1Y. The crowning shape of the second external gear 86 is the same as that of the first stage, and the tooth thickness of the tooth end portion is reduced by about 0.2 mm with respect to the tooth thickness of the central portion.

  The diameter of the mesh pitch circle in the second stage spline coupling is preferably designed to be 1.5 times or more than the diameter of the mesh pitch circle in the first stage spline coupling. In the present embodiment, this is designed to be twice or more. If the rotation transmission rigidity of the second stage spline gear is sufficiently larger than that of the first stage, the rotation transmission rigidity equivalent to the serration coupling, which is a conventional one-stage coupling, can be realized. This is because it can. For example, when the mesh diameter of the meshing pitch circle is the same in the first stage and the second stage, and the rigidity is also the same, the total transmission rigidity of the first stage and the second stage is about half the rigidity of the first stage. . That is, the transmission rigidity is reduced to half that of the conventional serration coupling, and the vibration of the photosensitive drum 1Y is easily induced. On the other hand, when the diameter of the meshing pitch circle of the second stage spline coupling is made 1.5 times or more larger than that of the first stage, the transmission rigidity is slightly less than four times. Therefore, the total transmission rigidity of the first stage and the second stage can be suppressed to about 20% of the first stage transmission rigidity.

[Modification 1]
Next, a modified example (hereinafter referred to as “modified example 1”) in the present embodiment will be described.
In the embodiment described above, the drum shaft 50Y of the photoreceptor driving device 10Y is inserted and fitted into the shaft fitting holes 55a and 55b provided in the front drum flange portion 53b and the rear drum flange portion 53a. As a result, the photosensitive drum 1Y is positioned on the drum shaft 50Y, so that the output shaft on the drive source side (drum shaft 50Y) and the input shaft on the photosensitive drum 1Y side are configured as a common shaft shaft. Therefore, there is no shaft eccentricity or shaft deviation error between the output shaft on the drive source side and the input shaft on the rotating body side. However, in order to ensure the detachability of the photosensitive drum unit, there is a gap between the outer diameter of the drum shaft 50Y and the inner diameters of the shaft fitting holes 55a and 55b of the front drum flange portion 53b and the rear drum flange portion 53a. Some fitting gaps are provided. In the embodiment described above, the first external gear 83 on the drum shaft 50Y is connected to the second internal gear 87 of the rear drum flange portion 53a via the intermediate transmission component 85, so that the above-described fitting gap is used. The photosensitive drum 1Y is rotatably supported without rattling.

  However, in order to rotationally support the photosensitive drum 1Y without causing backlash due to the fitting gap in this way, the first external gear 83 on the drum shaft 50Y and the second internal gear of the rear drum flange 53a. 87, relatively high accuracy is required for manufacturing errors of components such as the intermediate transmission component 85. That is, when the component manufacturing error is large, rattling occurs due to the fitting gap, making it difficult to transmit an appropriate driving force. For example, if the eccentricity of the second internal gear 87 of the rear drum flange 53a or the eccentricity of the first external gear 83 on the drum shaft 50Y exceeds an allowable range due to component manufacturing errors, the drum shaft 50Y and the photosensitive member As in the case where there is a shaft eccentricity or shaft deflection angle with respect to the rotation shaft of the drum 1, it becomes a cause of occurrence of rotational deflection or rotation transmission error of the photosensitive drum 1 </ b> Y.

  Therefore, in the first modification, when the photosensitive drum unit is attached to and detached from the copying machine main body, a fitting gap is generated so as not to impair the detachability, while the first external gear 83 on the drum shaft 50Y, the rear side drum, and the like. Even if there are large manufacturing errors such as the second internal gear 87 of the flange portion 53a and the intermediate transmission component 85, when the photosensitive drum 1Y is driven to rotate, the photosensitive drum 1Y is free from rattling due to the fitting gap. We propose a configuration that can support the rotation.

FIG. 6 is a cross-sectional view illustrating a schematic configuration of the photoreceptor driving device 10Y corresponding to the photoreceptor drum 1Y according to the first modification. FIG. 6 shows a state before the photosensitive drum unit is mounted on the copying machine main body.
In the first modification, tapered surfaces are formed on the inner walls of the shaft fitting holes 55a and 55b formed in the front drum flange portion 53b and the rear drum flange portion 53a. Specifically, as shown in FIG. 6, the taper surface of the shaft fitting hole 55a of the rear drum flange portion 53a tapers toward the central portion (front side) in the rotation axis direction of the photosensitive drum 1Y. It has a shape. Further, the taper surface of the shaft fitting hole 55b of the front drum flange portion 53b also has a tapered shape that tapers toward the central portion (rear side) in the rotation axis direction of the photosensitive drum 1Y. However, the inner diameters of the narrowest portions of the shaft fitting holes 55a and 55b are formed so that a fitting gap is formed between the shaft fitting holes 55a and 55b, and the detachability of the photosensitive drum unit is ensured.

  On the other hand, a rear side taper portion 58 as a fixed taper member corresponding to the taper surface of the shaft fitting hole 55a is formed in a portion on the drum shaft 50Y fitted into the shaft fitting hole 55a of the rear side drum flange portion 53a. Has been. Thus, when the photosensitive drum unit is mounted so that the drum shaft 50Y passes through the shaft fitting holes 55a and 55b of the photosensitive drum 1Y, the rear side taper portion 58 on the drum shaft 50Y is connected to the shaft fitting hole 55a. Fits in contact with the tapered surface. For the rear taper portion 58 on the drum shaft 50Y, for example, a taper shape in which the outer diameter on the wide diameter side is 15 mm and the outer diameter on the narrow diameter side is 10 mm can be employed.

  The rear taper portion 58 in the first modification may be configured to be press-fitted and fixed on the drum shaft 50Y, but in this case, the rear side taper portion 58 and the drum shaft 50Y are configured as separate parts. The accuracy is reduced, which is disadvantageous for proper driving force transmission. Therefore, it is preferable that the rear taper portion 58 is formed integrally with the drum shaft 50Y.

FIG. 7 is a cross-sectional view showing a schematic configuration of the photoreceptor driving device 10Y in a state where the photoreceptor drum unit is mounted on the copying machine main body.
In the first modification, the front end of the drum shaft 50Y is rotatably supported by a bearing 42 attached to the front side plate 40. The front side plate 40 is fixed to the main body frame 61 on the front side of the copying machine main body by, for example, screw fastening after the photosensitive drum unit is mounted on the copying machine main body. More specifically, the drum shaft 50Y is passed through the shaft fitting holes 55a and 55b of the photosensitive drum 1Y until the rear taper portion 58 on the drum shaft 50Y contacts the tapered surface of the shaft fitting hole 55a, and then the drum The front side plate 40 is attached to the front side end of the shaft 50Y, and the front side plate 40 is fixed to the front side main body frame 61. Therefore, in the first modification, the front side end portion of the drum shaft 50Y is rotatably supported by the main body frame 61 via the front side plate 40.

  A front cover member 41 is attached to the front side plate 40 in the first modification. Inside the front cover member 41, a coil spring 43 as an urging means and a front side taper member 44 as a movable taper member are provided. Contained. The coil spring 43 is provided so as to surround the outer peripheral surface of the drum shaft 50 </ b> Y, and its front side end is fixed to the bearing 42 of the front side plate 40 and its rear side end is fixed to the front side taper member 44. Yes. The front taper member 44 is biased toward the rear side by the biasing force of the coil spring 43, but the movement of the front taper member 44 toward the rear side is restricted by the stopper portion of the front cover member 41. As a result, the front taper member 44 is held in a state where the tapered portion is exposed to the outside of the front cover member 41.

  A through hole through which the drum shaft 50Y passes is formed in the center portion of the front taper member 44. The tapered portion of the front taper member 44 has a tapered shape that tapers toward the central portion (rear side) of the photosensitive drum 1Y in the rotational axis direction, and has a rotationally symmetric shape in the rotational direction of the drum shaft 50Y. Have.

  In the first modification, when the photosensitive drum unit is mounted on the copying machine main body, first, the shaft fitting of the photosensitive drum 1Y is performed until the rear taper portion 58 on the drum shaft 50Y contacts the taper surface of the shaft fitting hole 55a. The drum shaft 50Y is passed through the joint holes 55a and 55b. Thereafter, the front side plate 40 is mounted on the front side end portion of the drum shaft 50Y so that the front side end portion of the drum shaft 50Y passes through the through hole of the front side taper member 44 and fits into the bearing 42. Thereafter, the front side plate 40 is fixed to the front side main body frame 61.

  At this time, the front side taper member 44 is fitted into the taper portion of the shaft fitting hole 55 b of the front side drum flange portion 53 b, and the front side taper member 44 resists the urging force of the coil spring 43 and acts as a front side drum flange portion. 53b is pushed into the inner side (front side) of the front cover member 41. Thereby, the front side taper member 44 fitted to the drum shaft 50Y comes into contact with the taper surface of the shaft fitting hole 55b of the front side drum flange portion 53b. As a result, the front-side drum flange portion 53b is restricted from moving in the radial direction of the drum shaft 50Y, and even if a fitting clearance is formed between the shaft fitting hole 55b and the drum shaft 50Y, the drum shaft 50Y. It is positioned without rattling.

  Further, since the front side taper member 44 pushes the front side drum flange portion 53b toward the rear side by the biasing force of the coil spring 43, the rear side taper portion 58 on the drum shaft 50Y contacts the taper surface of the shaft fitting hole 55a. A contact state is secured. As a result, the rear-side drum flange portion 53a is also restricted from moving in the radial direction of the drum shaft 50Y, and the drum shaft 50Y even if a fitting gap is formed between the shaft fitting hole 55a and the drum shaft 50Y. It is positioned without rattling.

  On the other hand, when removing the photosensitive drum unit from the copying machine main body, the front side plate 40 is released from the front side end of the drum shaft 50Y after the front side plate 40 is fixed to the front side main body frame 61, and then the photosensitive member is removed. Pull out the drum unit from the copier body. When the front side plate 40 is removed from the front side end portion of the drum shaft 50Y, the front side taper member 44 of the front side plate 40 is fitted into the shaft fitting hole 55b of the front side drum flange portion 53b. When pulled out to the side, the stopper portion formed on the front cover member 41 of the front side plate 40 is caught by the front side taper member 44, so that the front side taper member 44 can also be removed together.

  According to the first modification, since the fitting gap (play) is formed between the drum shaft 50Y and the shaft fitting holes 55a and 55b through which the drum shaft 50Y is inserted, the detachability of the photosensitive drum unit with respect to the copying machine main body. Is secured. When the photosensitive drum unit is mounted on the copying machine main body, the rear side taper portion 58 and the front side taper member 44 on the drum shaft 50Y are formed on the taper surfaces of the shaft fitting holes 55a and 55b by the biasing force of the coil spring 43. Will be in contact. As a result, the movement of the photosensitive drum 1Y in the radial direction of the drum shaft 50Y is restricted. As a result, the photosensitive drum 1Y can be positioned with respect to the drum shaft 50Y without backlash. Therefore, even when a fitting clearance is formed between the shaft fitting holes 55a and 55b and the drum shaft 50Y, when the photosensitive drum 1Y is driven to rotate, the photosensitive drum 1Y is supported and supported without backlash. be able to.

  Here, in the first modification, the rear side taper portion 58 and the front side taper member 44 on the drum shaft 50Y are pressed against the taper surfaces of the shaft fitting holes 55a and 55b on the photoconductor drum 1Y side. The body drum 1Y is positioned on the drum shaft 50Y. Therefore, if the inner diameters of the shaft fitting holes 55a and 55b and the outer shapes of the rear taper portion 58 and the front taper member 44 change due to thermal expansion, the photosensitive drum 1Y may be displaced in the sliding direction (rotating shaft direction). . Further, when a radial force called an axial reaction force is large at a meshing portion such as the first external gear 83 on the drum shaft 50Y, the second internal gear 87 of the rear drum flange portion 53a, and the intermediate transmission component 85, the photoconductor The drum 1Y may be displaced in the radial direction.

  Therefore, in the first modification, as in the above-described embodiment, a two-stage spline cup using an intermediate transmission component 85 as a coupling mechanism for transmitting a driving force from the drum shaft 50Y to the photosensitive drum 1Y. A ring is used. In this configuration, since the meshing portion is a spline gear system, the meshing state is almost constant even if one gear is displaced in the thrust direction if the width of one of the meshing teeth is sufficiently wide relative to the amount of displacement in the thrust direction. Can be maintained. Therefore, even when the photosensitive drum 1Y is displaced in the sliding direction due to thermal expansion, appropriate driving force transmission can be maintained.

  Further, the displacement in the radial direction of the photosensitive drum 1Y described above is caused by a situation in which only a part of the teeth are engaged without contacting the teeth on the entire circumference due to a gear component manufacturing error. It is generated by generating a radial reaction force in 1Y in the radial direction. In the first modification, by adopting the two-stage spline coupling using the intermediate transmission component 85, the intermediate transmission component 85 swings to absorb the component manufacturing error, and the teeth that contact the teeth of the entire circumference come into contact. Can be combined. As a result, even if there is a deviation between the center of the first external gear 83 on the drum shaft 50Y and the center of the second internal gear 87 of the rear drum flange 53a on the photosensitive drum 1Y, the axial reaction force Does not occur, the radial displacement of the photosensitive drum 1Y is suppressed, and appropriate driving force transmission can be maintained.

[Modification 2]
Next, another modification example of the present embodiment (hereinafter, this modification example is referred to as “Modification Example 2”) will be described.
In Modification 1 described above, a gap (play) is provided between the through hole of the front taper member 44 and the drum shaft 50Y in order to pass the drum shaft 50Y through the through hole of the front taper member 44. By configuring the front side taper member 44 with a metal product that can be processed with higher accuracy than a resin product, the front side taper member 44 can be supported with a gap smaller than the fitting gap between the front side drum flange portion 53b and the drum shaft 50Y. The positioning accuracy of the photosensitive drum 1Y is increased. However, due to the presence of a gap between the through hole of the front taper member 44 and the drum shaft 50Y, slight backlash occurs between the front taper member 44 and the drum shaft 50Y. Therefore, when higher accuracy is required for positioning the photosensitive drum 1Y with respect to the drum shaft 50Y, it is required that the backlash between the front taper member 44 and the drum shaft 50Y is substantially zero. .

FIG. 8 is a cross-sectional view showing a schematic configuration of the photoreceptor driving device 10Y in a state where the photoreceptor drum unit is mounted on the copying machine main body in the second modification.
In the second modification, a front side taper portion 59 is formed at the center portion of the front side drum flange portion 53b. The front taper portion 59 has a shaft fitting hole 55b into which the drum shaft 50Y is fitted, and has an outer peripheral surface tapered. The taper shape of the front taper portion 59 is a taper shape that tapers toward the front side.

  Further, the front side taper member 45 provided on the front side plate 40 in Modification 2 has a hole 45a into which the front side taper part 59 of the front side drum flange part 53b is fitted. On the inner wall surface of the hole 45a, a tapered surface having a taper shape that tapers toward the front side is formed corresponding to the taper shape of the front taper portion 59, and in the rotation direction of the drum shaft 50Y. It has a rotationally symmetric shape. The front side taper member 45 is urged toward the rear side by the urging force of the coil spring 43, similarly to the front side taper member 44 of Modification 1 described above.

FIG. 9 is a cross-sectional view of the front side taper portion 59 cut along a cross section orthogonal to the axial direction of the drum shaft.
The front taper portion 59 in the second modification example has a three-claw chuck shape divided into three portions by three slits 59a extending along the drum axis. As a result, when the photosensitive drum unit is mounted on the copying machine main body, when the front side plate 40 is fixed to the front side main body frame 61 as in the first modification, the front side taper portion 59 of the front side drum flange portion 53b is The front side plate 40 is fitted into the hole 45 a of the front side taper member 45. And since the front side taper member 45 is urged | biased to the rear side by the urging | biasing force of the coil spring 43, the front side taper part 59 is inside the hole 45a of the front side taper member 45 along the taper shape. It is pushed in. By this pushing, the slit widths of the three slits 59a formed in the front side taper portion 59 are gradually narrowed. As a result, the diameter of the shaft fitting hole 55b formed in the front side taper portion 59 is reduced. Thus, there is no fitting gap between the shaft fitting hole 55b of the front taper portion 59 and the drum shaft 50Y. In particular, in the second modification, since the front side taper portion 59 of the front side drum flange portion 53b is formed of a resin material such as polycarbonate, the drum shaft 50Y is easily deformed by the urging force of the coil spring 43. Pressure contacted.

  As described above, according to the second modification, when the photosensitive drum unit is attached to and detached from the copying machine main body, the fitting gap (free play) is provided between the drum shaft 50Y and the shaft fitting hole 55b through which the drum shaft 50Y is inserted. ) Is formed, and the detachability is ensured. On the other hand, when the photosensitive drum unit is attached to the copying machine main body, the front side taper portion 59 of the front side drum flange portion 53b is moved along the taper shape by the biasing force of the coil spring 43. By being pushed into the 45 holes 45a, there is no fitting gap between the shaft fitting hole 55b of the front taper portion 59 and the drum shaft 50Y. Further, due to the urging force of the coil spring 43, there is no gap between the front taper portion 59 and the front taper member 45 of the front drum flange portion 53b. Therefore, the backlash between the front taper member 44 and the drum shaft 50Y can be substantially zero.

[Modification 3]
Next, still another modification example of the present embodiment (hereinafter, this modification example is referred to as “Modification Example 3”) will be described.
Since the intermediate transmission component 85 is in a floating support state, the intermediate transmission component 85 moves in the thrust direction of the drum shaft 50Y, and the intermediate transmission component 85 falls off before mounting, or the coupling is engaged after mounting. May come off. Therefore, in the above-described embodiment and modifications 1 and 2, the thrust of the drum shaft 50Y of the intermediate transmission component 85 is configured such that the intermediate transmission component 85 is sandwiched between the rear drum flange portion 53a and the side plate frame 56. It is configured to restrict movement in the direction.

  However, in the above-described embodiment and modifications 1 and 2, the photosensitive drum holding frame 57 contacts the side surface of the second external gear 86 of the intermediate transmission component 85, and the intermediate transmission component 85 before mounting is the photosensitive drum unit. It is configured so that it does not fall off or tilt significantly within 54Y. As described above, the movement of the intermediate transmission component 85 in the thrust direction of the drum shaft 50Y is basically such that each end portion in the axial direction (thrust direction) of the cylindrical body that is the cylindrical portion of the intermediate transmission component 85 is on the rear side. It is regulated by coming into contact with the surface of the drum flange 53a and the side plate frame 56. However, if the intermediate transmission component 85 is tilted to absorb an error that adversely affects drive transmission, the photosensitive drum holding frame 57 may come into contact with the side surface of the second external gear 86 of the intermediate transmission component 85. In this case, there is a possibility that appropriate drive transmission by the intermediate transmission component 85 is hindered.

  This point will be described in detail. The greater the contact force between the intermediate transmission component 85 and the member that contacts the intermediate transmission component 85, the greater the frictional force acting between them, and the force acting in the radial direction on the intermediate transmission component 85 is increased. It becomes large and a rotation transmission error occurs, and proper drive transmission is likely to be hindered. When the intermediate transmission component 85 abuts against the surfaces of the rear drum flange portion 53a and the side plate frame 56 and is restricted, a contact force acts on the axial end portion of the cylindrical main body of the intermediate transmission component 85. When the intermediate transmission component 85 is inclined, the rotational moment of the intermediate transmission component 85 acting on the axial end portion of the cylindrical body of the intermediate transmission component 85 is relatively small. Therefore, even if the intermediate transmission component 85 is inclined and the intermediate transmission component 85 comes into contact with the rear drum flange portion 53a or the side plate frame 56, the frictional force received by the intermediate transmission component 85 is relatively small and the received frictional force. Therefore, since the force acting in the radial direction on the intermediate transmission component 85 is relatively small, the influence on the rotation transmission error is small.

  On the other hand, when the intermediate transmission component 85 abuts against the photosensitive drum holding frame 57 and is regulated, the side surface (thrust) of the second external gear 86 positioned radially outward from the cylindrical main body of the intermediate transmission component 85. The contact force acts on the surface facing the direction. In this case, when the intermediate transmission component 85 is inclined, the rotational moment of the intermediate transmission component 85 acting on the side surface of the second external gear 86 in the intermediate transmission component 85 is relatively large. Therefore, when the intermediate transmission component 85 is inclined and the intermediate transmission component 85 contacts the photosensitive drum holding frame 57, the frictional force received by the intermediate transmission component 85 is relatively large, and the intermediate transmission component 85 is applied to the intermediate transmission component 85 by the received frictional force. On the other hand, since the force acting in the radial direction becomes relatively large, the influence on the rotation transmission error is large. As a result, if the intermediate transmission component 85 abuts against the photosensitive drum holding frame 57 and is restricted, proper drive transmission by the intermediate transmission component 85 may be hindered.

  Therefore, in the third modification, even if the intermediate transmission component 85 is tilted, the side surface of the second external gear 86 of the intermediate transmission component 85 does not come into contact with the photosensitive drum holding frame 57, and the cylindrical main body of the intermediate transmission component 85 A configuration is proposed in which the abutment comes into contact with and is regulated.

FIG. 10 is a cross-sectional view illustrating a schematic configuration of the photoreceptor driving device 10Y according to the third modification. FIG. 10 shows a state before the photosensitive drum unit is mounted on the copying machine main body.
In the third modification, the intermediate transmission component 85 is sandwiched between the resin drive-side regulating member 64 press-fitted and fixed to the drum shaft 50Y and the rear drum flange portion 53a, so that the drum of the intermediate transmission component 85 is inserted. The movement of the shaft 50Y in the thrust direction is restricted.

  The cylindrical main body 89 of the intermediate transmission component 85 is formed so as to protrude outward in the axial direction from the first internal gear 84 and the second external gear 86. As a result, when the intermediate transmission component 85 undergoes a thrust movement toward the rear side in the mounted state, the cylindrical main body 89 of the intermediate transmission component 85 abuts on the drive side regulating member 64 and the rear side of the intermediate transmission component 85 Thrust movement to is regulated. On the other hand, when the intermediate transmission component 85 is thrust-moved to the front side, the cylindrical main body 89 of the intermediate transmission component 85 comes into contact with the rear drum flange portion 53a, and the thrust movement of the intermediate transmission component 85 to the front side is performed. Is regulated.

  In the third modification, the side surface of the second external gear 86 of the intermediate transmission component 85 contacts the photosensitive drum holding frame 57 even when the intermediate transmission component 85 is tilted to absorb an error that adversely affects drive transmission. The photosensitive drum holding frame 57 is configured so as not to contact. Therefore, the intermediate transmission component 85 that is inclined to absorb the error comes into contact with only the side surfaces in the axial direction of the cylindrical main body 89 of the intermediate transmission component 85. Thereby, even if the intermediate transmission component 85 is tilted, it is possible to prevent the appropriate drive transmission by the intermediate transmission component 85 from being hindered. In particular, the intermediate transmission component 85, the rear drum flange portion 53a that contacts the intermediate transmission component 85, and the drive side restricting member 64 are all made of resin, and the frictional force at the time of the contact can be kept small.

  The restriction is made at the axial end of the cylindrical body 89 of the intermediate transmission component 85, rather than the restriction by the second external gear 86 formed on the support side plate 88 projecting radially outward from the cylindrical body 89. The intermediate transmission component 85 is less deformed or damaged when receiving. Therefore, since an allowable range such as strength required for the intermediate transmission component 85 is widened, the intermediate transmission component 85 can be formed of a resin such as POM (polyacetal).

  Further, in the third modification, the drive side regulating member 64 is configured as a separate member from the first external gear 83, but these may be configured as a single member by integral molding or the like. If the drive-side regulating member 64 is not positioned so that the surface in contact with the cylindrical main body 89 is orthogonal to the axial direction of the drum shaft 50Y, the drive-side regulating member 64 is driven with the cylindrical main body 89 during one round of the cylindrical main body. The axial position where the side regulating members 64 come into contact with each other varies. In this case, there is a possibility that the tilting posture of the intermediate transmission component 85 is affected and proper drive transmission is hindered. The first external gear 83 is attached to the drum shaft 50Y with high accuracy. If the first external gear 83 and the drive side regulating member 64 are a single member, the surface that contacts the cylindrical main body 89. It is easy to position the drive side restricting member 64 with high accuracy so that is perpendicular to the axial direction of the drum shaft 50Y.

[Modification 4]
Next, still another modification example of the present embodiment (hereinafter, this modification example will be referred to as “Modification Example 4”) will be described.
FIG. 11 is a cross-sectional view illustrating a schematic configuration of the photoreceptor driving device 10Y according to the fourth modification. FIG. 11 shows a state in which the photosensitive drum unit is mounted on the copying machine main body.
The basic configuration of the fourth modification is the same as that of the third modification, but in the rear side drum flange portion 53a and the drive side regulating member 64, each end of the cylindrical main body 89 of the intermediate transmission component 85 abuts. Are provided with protrusions 65a and 65b. Thereby, it becomes easy to ensure a stable contact state between each end of the cylindrical main body 89 of the intermediate transmission component 85, the rear drum flange portion 53a, and the drive side regulating member 64. The intermediate transmission component 85 comes into contact with the rear drum flange portion 53a and the drive side regulating member 64 in an inclined state so as to absorb each component error. The projecting portions 65a and 65b are formed so that the end portions of the cylindrical main body 64 of the intermediate transmission component 85 and the rear drum flange portion 53a and the projecting portions 65a and 65b of the drive side regulating member 64 are in contact with each other.

[Modification 5]
Next, still another modified example (hereinafter, this modified example is referred to as “modified example 5”) in the present embodiment will be described.
FIG. 12 is a cross-sectional view showing a schematic configuration of the rear-side drum flange portion 53a and the drive-side regulating member 64 that are in contact with the intermediate transmission component 85 of the photoreceptor driving device 10Y according to the fifth modification.
A broken-line partial curve indicated by reference numeral C1 in FIG. 12 indicates that when the intermediate transmission component 85 rotates around the rotation axis orthogonal to the drum shaft 50Y around the center of gravity of the cylindrical main body 89 of the intermediate transmission component 85. The locus | trajectory of the position which the rear side edge part 89a of the intermediate transmission component 85 can take is shown. Further, a broken line partial curve indicated by reference numeral C2 in FIG. 12 is obtained when the intermediate transmission component 85 rotates around the rotation axis orthogonal to the drum shaft 50Y around the center of gravity of the cylindrical main body 89 of the intermediate transmission component 85. The locus of the position that the front side end portion 89b of the intermediate transmission component 85 can take is shown.

  The basic configuration of the fifth modification is the same as that of the fourth modification. However, in the fifth modification, the contact surfaces of the protrusions 65a and 65b with which the ends of the cylindrical main body 89 of the intermediate transmission component 85 abut. However, it has a curved surface shape. Specifically, the contact surface of the protrusion 65a in the drive side regulating member 64 has a curved surface shape along the broken line partial curve C1 shown in FIG. Further, the contact surface of the protrusion 65b in the rear drum flange 53a has a curved surface shape along the broken line partial curve C2 shown in FIG. By adopting such a curved surface shape, each end portion of the cylindrical main body 89 of the intermediate transmission component 85 and the drive side regulating member 64 even if the inclination posture of the intermediate transmission component 85 for absorbing component manufacturing errors changes. The gap between the protrusion 65a and the protrusion 65b of the rear drum flange 53a can be made substantially constant. As a result, the movement of the intermediate transmission component 85 in the thrust direction can be stably regulated regardless of the inclined posture of the intermediate transmission component 85.

[Modification 6]
Next, still another modified example (hereinafter, this modified example is referred to as “modified example 6”) in the present embodiment will be described.
Since fluctuations in the rotational speed of the photosensitive drum 1Y cause image density unevenness called banding and image position error called color misregistration, high rotational accuracy is required for the photosensitive drum 1Y. Therefore, it is important to ensure stable rotation transmission performance of the gear and the coupling portion, and it is usual to apply a lubricant such as grease to the meshing portion and the bearing portion of the gear. Accordingly, the lubricant is also applied to the first internal gear 84 and the second external gear 86 of the intermediate transmission component 85.

However, the grease (lubricant) applied to the first internal gear 84 and the second external gear 86 is caused by the rotation of the photosensitive drum 1Y, the attachment / detachment of the photosensitive drum unit, and the leaving of the photosensitive drum unit for a long time. The first internal gear 84 and the second external gear 86 may scatter. When the grease is scattered, the scattered grease may adhere to the outer peripheral surface of the photosensitive drum 1Y located in the vicinity thereof through a space communicating with the outer peripheral surface of the photosensitive drum 1Y. If the grease adheres to the outer peripheral surface of the photosensitive drum 1Y, image formation failure on the photosensitive drum 1Y is caused, and image quality is deteriorated.
In addition, toner may float and scatter around the outer peripheral surface of the photosensitive drum 1Y, and such toner passes through the space communicating with the first internal gear 84 and the second external gear 86 to the first. It may be carried to the internal gear 84 or the second external gear 86. In this case, toner adheres to the grease applied to the first internal gear 84 and the second external gear 86, and there is a possibility that the lubrication performance by the grease may be reduced.

  Therefore, in the sixth modification, a shielding member that shields at least a part of the space between the first internal gear 84 and the second external gear 86 in the intermediate transmission component 85 and the outer peripheral surface of the photosensitive drum 1Y is provided. Yes.

FIG. 13 is a cross-sectional view illustrating a schematic configuration of the photoconductor driving device 10Y according to the sixth modification. FIG. 13 shows a state before the photosensitive drum unit is mounted on the copying machine main body.
Also in the present modified example 6, as in the modified example 3 and modified example 4 described above, an intermediate transmission component 85 is provided between the resin drive side regulating member 64 press-fitted and fixed to the drum shaft 50Y and the rear drum flange portion 53a. The intermediate transmission component 85 is restricted from moving in the thrust direction of the drum shaft 50Y. With such a configuration, when the photosensitive drum unit is mounted on the copying machine main body, the drive side regulating member 64 is located in the space between the first internal gear 84 of the intermediate transmission component 85 and the outer peripheral surface of the photosensitive drum 1Y. Exists (see FIG. 11). Therefore, the drive-side regulating member 64 functions as a shielding member, and it is possible to suppress the grease scattered from the first internal gear 84 from adhering to the outer peripheral surface of the photosensitive drum 1Y, and the periphery of the outer peripheral surface of the photosensitive drum 1Y. It is also possible to prevent the toner floating or scattered from adhering to the grease on the first internal gear 84 from deteriorating the lubricating performance due to the grease.

  Since there is a slight gap between the cylindrical main body 89 of the intermediate transmission component 85 and the drive side regulating member 64, the grease from the first internal gear 84 is slightly scattered through this gap, or the toner is first discharged. There is a possibility that the first internal gear 84 may approach slightly. However, in the sixth modification, the movement path through which the grease and toner move in the space between the first internal gear 84 and the outer peripheral surface of the photosensitive drum 1Y is relatively long. For this reason, even if such a slight gap exists, image quality deterioration due to the adhesion of grease to the outer peripheral surface of the photosensitive drum 1Y and a decrease in lubrication performance due to the adhesion of toner to the grease can be manifested. It can be said that there is little nature.

  On the other hand, in the sixth modification, the cover member 60 is provided in the space between the second external gear 86 of the intermediate transmission component 85 and the outer peripheral surface of the photosensitive drum 1Y. As shown in FIG. 13, the cover member 60 is fixed to the edge of the opening of the rear drum flange 53a into which the second external gear 86 is inserted, and is provided so as to extend toward the drum shaft 50Y. ing. As a result, the cover member 60 functions as a shielding member, and the grease scattered from the second external gear 86 is suppressed from adhering to the outer peripheral surface of the photosensitive drum 1Y, and floats around the outer peripheral surface of the photosensitive drum 1Y. Further, it is also possible to prevent the scattered toner from adhering to the grease on the second external gear 86 and reducing the lubrication performance due to the grease.

  Considering a configuration in which the cover member 60 is not provided (for example, the configuration shown in FIG. 11), through the gap existing between the edge of the opening of the rear drum flange portion 53 a and the photosensitive drum holding frame 57, There is a possibility that the grease from the second external gear 86 will be scattered somewhat, or that the toner will enter the second external gear 86 slightly. In particular, in the sixth modification, the movement path for the grease and toner to move in the space between the second external gear 86 and the outer peripheral surface of the photosensitive drum 1Y has a considerably short configuration. For this reason, the image quality deterioration and the lubrication performance deterioration are easily manifested by the grease and toner passing through the gap.

According to the sixth modification, as a result of the cover member 60 being provided and the grease scattering from the second external gear 86 being hindered, the edge of the opening of the rear drum flange 53a and the photosensitive drum holding frame 57 are provided. The grease can be prevented from reaching the outer peripheral surface of the photosensitive drum 1Y through the gap between the two. Therefore, it is possible to suppress image quality deterioration due to the adhesion of grease to the outer peripheral surface of the photosensitive drum 1Y.
Further, since the cover member 60 is provided, the toner that has passed through the gap existing between the edge of the opening of the rear drum flange portion 53a and the photosensitive drum holding frame 57 becomes grease on the second external gear 86. Is inhibited from adhering to. Therefore, it is possible to suppress a decrease in the lubrication performance due to the toner adhering to the grease on the second external gear 86.

  In particular, in the present modification 6, by providing the cover member 60, as shown in FIG. 13, the rear side drum flange portion 53a, the support side plate 88 of the intermediate transmission component 85, and the cover member 60 are used. The second external gear 86 is enclosed. As a result, the movement path of the grease scattered from the second external gear 86 and the movement path of the toner entering the second external gear 86 are greatly limited.

  Moreover, in the sixth modification, as shown in FIG. 13, the end of the cover member 60 on the drum shaft 50 </ b> Y side is bent in an L shape (about 90 °) toward the support side plate 88 of the intermediate transmission component 85. It has a shape. Thereby, the movement path of the grease scattered from the second external gear 86 and the movement path of the toner entering the second external gear 86 are further limited. Note that the angle of the bending need not be 90 °, and may be, for example, about 45 °. Further, the bent position may be bent at any position as long as the end of the cover member 60 on the drum shaft 50Y side is bent toward the support side plate 88 of the intermediate transmission component 85.

  Further, the cover member 60 of the present modification 6 is fixed to the rear drum flange portion 53a by screws or adhesion. For example, the fixing portion of the cover member 60 is formed in a U-shape so that the rear drum flange portion 53a is fixed. Other fixing methods may be used, such as a configuration in which light press-fitting is performed and fixed. In particular, since the cover member 60 is intended to suppress grease scattering or toner adhesion in the second external gear 86, it only needs to perform its function, and in the sixth modification, the cover member 60 is stronger than other components. Since it does not come into contact, there is no fear that it will come off even with a fixing force that is fixed by light press-fitting.

  Further, the cover member 60 of the sixth modification is fixed to the rear drum flange portion 53a, but may be configured to be fixed to the intermediate transmission component 85 side as shown in FIG. Specifically, it is fixed to the side surface of the second external gear 86 of the intermediate transmission component 85, and extends to the outside in the radial direction of the drum shaft 50Y from the opening of the rear side drum flange portion 53a into which the second external gear 86 is inserted. Provide to do. However, even in this configuration, the movement path of the grease scattered from the second external gear 86 and the movement path of the toner entering the second external gear 86 are limited as compared with the configuration in which the cover member 60 is not provided. However, the movement path through the gap between the cover member 60 and the rear drum flange portion 53a is relatively short. In this respect, the configuration shown in FIG. 13 is preferable.

  Further, the cover member 60 of the sixth modification has a shape in which the end of the cover member 60 on the drum shaft 50Y side is bent in an L shape (about 90 °) toward the support side plate 88 of the intermediate transmission component 85. Yes. Therefore, the manufacturing cost is higher than that of a plate-like cover member that is not bent. Therefore, as shown in FIG. 15, a simple cover member 60 'that can be manufactured at a lower cost may be used. In the configuration shown in FIG. 15, a disc-like cover member 60 ′ that is not bent is used, and the mounting surface of the rear drum flange portion 53 a to which the cover member 60 ′ is attached faces the support side plate 88 of the intermediate transmission component 85. It is comprised so that it may incline. As a result, the cover member 60 ′ is attached to the inclined mounting surface of the rear drum flange portion 53 a, so that the end of the cover member 60 on the drum shaft 50 Y side approaches the support side plate 88 of the intermediate transmission component 85. Is done. As a result, the movement path of the grease scattered from the second external gear 86 and the second external gear are the same as in the cover member 60 whose end on the drum shaft 50Y side is bent toward the support side plate 88 of the intermediate transmission component 85. The movement path of the toner entering the 86 can be limited.

  Further, the cover member 60 ′ of the sixth modification may be formed of an elastic member. By configuring the cover member 60 ′ with an elastic member, when the intermediate transmission component 85 is inclined or moved in the thrust direction and the intermediate transmission component 85 comes into contact with the cover member 60 ′, FIG. As shown, the cover member 60 'can be deformed. As a result, the possibility that the transmission of the stable rotational driving force by the intermediate transmission component 85 is hindered is reduced. At this time, it is preferable that the cover member 60 ′ has elasticity that can deform the cover member 60 ′ even with a small force that does not generate a reaction force that affects the inclination and thrust movement of the intermediate transmission component 85. . By configuring the cover member 60 ′ with such an elastic member, it is possible to configure the gap between the cover member 60 ′ and the intermediate transmission component 85 to be narrower or eliminated. As a result, the movement path of the grease scattered from the second external gear 86 and the movement path of the toner entering the second external gear 86 can be further limited. In particular, as shown in FIGS. 16A and 16B, the contact state between the cover member 60 ′ and the intermediate transmission component 85 is maintained even if the intermediate transmission component 85 is inclined or moved in the thrust direction. By adopting such a configuration, it is possible to block the movement path, and the image quality is deteriorated due to scattered grease from the second external gear 86, and the lubrication performance is deteriorated due to toner adhesion to the grease on the second external gear 86. Can be suppressed more effectively.

  Note that the cover member 60 having a bent shape as shown in FIG. 13 and FIG. 14 and the cover member 60 fixed to the intermediate transmission component 85 side as shown in FIG. By doing so, the same effect can be obtained.

What has been described above is merely an example, and the present invention has a specific effect for each of the following modes.
(Aspect A)
A driving output shaft such as a drum shaft 50Y that rotates by receiving a driving force from a driving source provided in an image forming apparatus main body such as the copying machine main body 100, and an axial direction of the driving output shaft with respect to the image forming apparatus main body. A rotating body such as a photosensitive drum 1Y that can be attached and detached along with the driving side coupling portion such as a first external gear 83 provided on the driving output shaft, and a second internal gear 87 provided on the rotating body. A driven side coupling portion, a first intermediate coupling portion such as a first internal gear 84 engaged with the driving side coupling portion, and a second external gear 86 engaged with the driven side coupling portion. In the rotary body drive device such as the photoconductor drive device 10Y, which includes the second intermediate coupling portion and has the intermediate transmission component 85 supported by the drive side coupling portion and the driven side coupling portion, the rotation Body There are insertion holes such as shaft fitting holes 55a and 55b through which the drive output shaft is inserted when the drive output shaft is attached to the image forming apparatus main body, and the drive output shaft is inserted into the insertion hole of the rotating body. The rotating body is positioned on the drive output shaft.
According to this, even if the allowable range of component manufacturing error is widened, appropriate drive transmission can be realized, so that a lower manufacturing cost can be realized.

(Aspect B)
In the aspect A, the drive-side coupling portion is configured by a male spline member such as a first external gear 83, and the first intermediate coupling portion of the intermediate transmission component is engaged with the male spline member. It is characterized by comprising a female spline member such as an internal gear 84.
Accordingly, the intermediate transmission component 85 that absorbs errors can be configured with a simpler configuration.

(Aspect C)
In the above aspect B, the male spline member constituting the drive side coupling portion is made of metal and is press-fitted and fixed to the drive output shaft.
According to this, compared with the case where the male spline member is fixed on the drive output shaft by another shaft fixing method using a non-rotating pin or an oval shape, high transmission rigidity can be obtained.

(Aspect D)
In any one of the above aspects A to C, the driven side coupling portion is constituted by a female spline member such as the second internal gear 87, and the like.
The second intermediate coupling portion of the intermediate transmission component is constituted by a male spline member such as a second external gear 86 that engages with the female spline member.
Accordingly, the intermediate transmission component 85 that absorbs errors can be configured with a simpler configuration.

(Aspect E)
In the aspect D, the rotating body includes a rear drum flange portion 53a and the like in which a female spline member constituting the driven side coupling portion is formed at an end portion of a rotating body main body such as a cylindrical drum cylinder 52Y. The flange portion is press-fitted and fixed.
According to this, compared with the case where a female spline member is fixed to a rotary body with the other axis | shaft fixing system using a non-rotating pin or an oval shape, high transmission rigidity can be obtained.

(Aspect F)
In any one of the aspects A to E, at least one of the first intermediate coupling part and the second intermediate coupling part has a maximum tooth thickness at the center portion in the drive output axial direction. And a spline member having a tooth shape such as a crowning shape in which the tooth thickness decreases toward both ends in the drive output axis direction.
By making the tooth profile a crowning shape in this way, the allowable range of axial misalignment is increased. Further, even if the shaft misalignment occurs, the teeth on the entire circumference stably mesh with each other, so that the rotation transmission rigidity is improved.

(Aspect G)
In the aspect F, the intermediate transmission component is injection-molded using a plurality of molds such as an upper mold 91 and a lower mold 92 that are mold-divided at a central portion in the drive output axial direction of the at least one intermediate coupling portion. It is a resin molded product.
According to this, the intermediate transmission part which made the tooth profile of the 1st intermediate coupling part or the 2nd intermediate coupling part into the above-mentioned crowning shape can be integrally formed by injection molding. Therefore, the manufacturing cost can be reduced.

(Aspect H)
In any one of the above aspects A to G, the rotating body has the insertion holes at both ends of the driving output shaft direction, and the driving output shaft is inserted into both insertion holes of the rotating body. The rotating body is positioned on the drive output shaft.
According to this, the rotating shaft of the rotating body is not inclined with respect to the drive output shaft, and an axial deviation error between the driving side and the rotating body side can be eliminated. It can be expanded.

(Aspect I)
In any one of the above aspects A to H, the driven portion is driven with respect to the diameter of the meshing pitch circle at the first-stage coupling portion where the driving side coupling portion and the first intermediate coupling portion are engaged. The diameter of the meshing pitch circle at the second coupling position where the side coupling portion and the second intermediate coupling portion engage with each other is configured to be 1.5 times or more. .
According to this, the total transmission stiffness of the first-stage coupling location and the second-stage coupling location can be suppressed to about 20% of the transmission stiffness of the first-stage coupling location. .

(Aspect J)
In any one of the above aspects A to I, the rotating body has two insertion holes such as shaft fitting holes 55a and 55b at different positions in the drive output shaft direction, and forms the two insertion holes. Each insertion hole forming member has a tapered surface that tapers in a direction in which the drive output shaft enters toward the insertion hole when the rotating body is mounted on the image forming apparatus main body, and is fixed on the drive output shaft. A fixed taper member such as a rear taper portion 58 that is supported and has a tapered surface that comes into contact with the taper surface of one insertion hole forming member when the rotating body is mounted on the image forming apparatus main body, and along the drive output shaft Movable taper members such as front side taper members 44 and 45 having a taper surface that is slidably supported and has a tapered surface that comes into contact with the taper surface of the other insertion hole forming member when the rotating body is mounted on the image forming apparatus body. The movable taper A biasing means such as a coil spring 43 for biasing the movable taper member in a direction in which the taper surface of the member abuts against the taper surface of the other insertion hole forming member, and the drive output shaft of the rotating body The drive output is caused when the fixed taper member on the drive output shaft and the taper surface of the movable taper member abut on the taper surface of each insertion hole forming member by the biasing force of the biasing means. The rotating body is positioned on the shaft.
According to this, when the rotating body is attached to the image forming apparatus main body, the fixed taper member and the movable taper member on the drive output shaft with respect to the taper surface of each insertion hole forming member by the biasing force of the biasing means. The tapered surface comes into contact, and the rotating body is positioned on the drive output shaft. Therefore, even if play (gap) is provided between the insertion hole and the drive output shaft in order to ensure the detachability of the rotating body with respect to the image forming apparatus main body, the rotating body is free from rattling when the rotating body is driven to rotate. Can be supported in rotation.

(Aspect K)
In the above aspect J, the fixed taper member is formed integrally with the drive output shaft.
According to this, higher accuracy can be achieved and the rotating body can be driven to rotate more appropriately than in the case where the fixed taper member is configured as a separate component from the drive output shaft.

(Aspect L)
In the above aspect J or K, the movable taper member has a hole 45a provided with the tapered surface on the inner wall surface, and the other insertion hole forming member is formed on the outer wall surface of the movable taper member. It has a taper surface that contacts the taper surface, and is composed of a plurality of members in which a plurality of slits are formed in the rotation direction of the drive output shaft.
According to this, as described in the second modification example, when the rotating body is attached to or detached from the image forming apparatus main body, a play (gap) is provided between the other insertion hole and the drive output shaft to ensure detachability. On the other hand, when the rotating body is mounted on the image forming apparatus main body, the other insertion hole forming member is pushed into the hole of the movable taper member along the tapered shape by the urging force of the urging means. As a result, the diameter of the other insertion hole is reduced by narrowing the slit of the other insertion hole forming member, and there is no play (gap) between the other insertion hole and the drive output shaft. Therefore, when the rotating body is attached to the image forming apparatus main body, the gap between the other insertion hole forming member and the movable taper member is also eliminated by the biasing force of the biasing means. Therefore, the play due to these gaps is substantially zero, and the rotating body can be driven to rotate more appropriately.

(Aspect M)
In any of the above aspects A to L, the intermediate transmission component includes a cylindrical portion such as a cylindrical main body 89 in which a hole through which the drive output shaft is inserted penetrates in the axial direction. Restriction members such as a rear side drum flange 53a, a side plate frame 56, a drive side restriction member 64 and the like that abut against the axial end and restrict movement of the intermediate transmission component in the axial direction (thrust direction) of the drive output shaft. It is characterized by having.
According to this, even if the intermediate transmission component is tilted to absorb an error that adversely affects drive transmission, the frictional force that the intermediate transmission component receives from the restricting member is small, and the received frictional force is applied to the intermediate transmission component. The force acting in the radial direction is small. Therefore, it is possible to reduce the influence of the restriction of the movement of the intermediate transmission component in the thrust direction by the restriction member on the rotation transmission error.

(Aspect N)
In the aspect M, the contact surface of the restriction member that contacts the axial ends 89a and 89b of the cylindrical portion is the axis of the cylindrical portion when the shaft of the cylindrical portion is inclined with respect to the drive output shaft. It has a curved surface shape corresponding to the locus of the direction end.
According to this, when the inclination posture of the intermediate transmission component for absorbing the component manufacturing error is changed, it is possible to suppress the fluctuation between the axial end portion of the cylindrical portion of the intermediate transmission component and the regulating member. Therefore, it is possible to stably regulate the movement of the intermediate transmission component in the thrust direction regardless of the inclined posture of the intermediate transmission component 85.

(Aspect O)
In the aspect N, the curved surface shape of the contact surface of the restricting member is the cylinder when the intermediate transmission component rotates about the rotation axis orthogonal to the drive output shaft around the center of gravity of the intermediate transmission component. It is a curved surface shape along the trajectory of the axial end of the part.
According to this, even if the inclination posture of the intermediate transmission component for absorbing the component manufacturing error changes, the gap between the axial end of the cylindrical portion of the intermediate transmission component and the regulating member can be made substantially constant. . Therefore, the movement of the intermediate transmission component in the thrust direction can be more stably regulated regardless of the inclination posture of the intermediate transmission component.

(Aspect P)
In any one of the above aspects A to O, at least one intermediate coupling part of the first intermediate coupling part and the second intermediate coupling part in the intermediate transmission component, and an outer peripheral surface of the rotating body, It has a shielding member such as a cover member 60, 60 'that shields at least a part of the space between them.
According to this, it is suppressed by the shielding member that the lubricant such as grease scattered from the at least one intermediate coupling portion reaches the outer peripheral surface of the rotating body. As a result, it is possible to suppress the occurrence of various problems due to the grease adhering to the outer peripheral surface of the rotating body. Further, the shielding member can also suppress a situation in which suspended matter and scattered matter from the outer peripheral surface of the rotating body adhere to the lubricant on the at least one intermediate coupling portion and deteriorate the lubrication performance.

(Aspect Q)
In the aspect P, the driven-side coupling portion is configured by a female spline member, and the second intermediate coupling portion that is the at least one intermediate coupling portion is engaged with the female spline member. The shielding member is fixed to the edge of the opening of the driven side coupling portion into which the second intermediate coupling portion is inserted, and is provided to extend toward the drive output shaft. It is characterized by.
According to this, the movement path of the lubricant such as grease scattered from the at least one intermediate coupling portion to the outer peripheral surface of the rotating body, the suspended matter from the outer peripheral surface of the rotating body, and the at least the scattered material described above. The movement path to one intermediate coupling part can be more effectively limited.

(Aspect R)
In the aspect Q, the shielding member is composed of an elastic member that is deformable when the intermediate transmission component is displaced in the axial direction of the drive output shaft and abuts on the second intermediate coupling portion. Features.
According to this, even if the intermediate transmission component is displaced in the axial direction of the drive output shaft and contacts the shielding member, it is difficult to affect the displacement of the intermediate transmission component, so the shielding member and the second intermediate coupling portion It is possible to adopt a configuration in which the gap between the two is narrower or eliminated. As a result, the movement path of the lubricant scattered from the at least one intermediate coupling portion to the outer peripheral surface of the rotating body, the suspended matter from the outer peripheral surface of the rotating body, and the at least one intermediate coupling of the scattered object The movement route to the section can be more effectively limited.

(Aspect S)
In the above aspect Q or R, the shielding member is press-fitted and fixed to the edge of the opening of the driven side coupling portion.
According to this, the shielding member can be easily fixed to the edge of the opening of the driven side coupling part.

(Aspect T)
In the aspect P, the driven-side coupling portion is configured by a female spline member, and the second intermediate coupling portion that is the at least one intermediate coupling portion is engaged with the female spline member. The shielding member is fixed to the second intermediate coupling portion, and is radially outward of the drive output shaft from the opening of the driven side coupling portion into which the second intermediate coupling portion is inserted. It is provided so that it may extend to.
According to this, the movement path of the lubricant such as grease scattered from the at least one intermediate coupling portion to the outer peripheral surface of the rotating body, the suspended matter from the outer peripheral surface of the rotating body, and the at least the scattered material described above. The movement path to one intermediate coupling part can be more effectively limited.

(Aspect U)
In the aspect T, the shielding member is composed of an elastic member that can be deformed when the intermediate transmission component is displaced in the axial direction of the drive output shaft and contacts the edge of the opening of the driven side coupling portion. It is characterized by being.
According to this, even if the intermediate transmission component is displaced in the axial direction of the drive output shaft and the edge of the opening of the driven coupling portion contacts the shielding member, the displacement of the intermediate transmission component is hardly affected. Therefore, it is possible to adopt a configuration in which the gap between the shielding member and the edge of the opening of the driven side coupling portion is narrower or eliminated. As a result, the movement path of the lubricant scattered from the at least one intermediate coupling portion to the outer peripheral surface of the rotating body, the suspended matter from the outer peripheral surface of the rotating body, and the at least one intermediate coupling of the scattered object The movement route to the section can be more effectively limited.

(Aspect V)
In any one of the above aspects P to U, the shielding member has a shape bent in a direction of narrowing a moving path of an object passing through the space.
According to this, the movement path of the lubricant scattered from the at least one intermediate coupling portion to the outer peripheral surface of the rotating body, the suspended matter from the outer peripheral surface of the rotating body, and the intermediate of the at least one of the scattered objects. The movement path to the coupling unit can be easily limited.

(Aspect W)
In an image forming apparatus having a rotating body driving device including a rotating body and a drive transmission unit that transmits a driving force from a driving source to the rotating body, the rotating body driving device is any one of the above aspects A to V. The rotating body drive device according to the above aspect is used.
According to this, even if the allowable range of the component manufacturing error is widened, appropriate drive transmission of the rotating body can be realized, so that a high-quality image forming apparatus can be realized at a lower manufacturing cost.

DESCRIPTION OF SYMBOLS 1 Photoconductor drum 10Y Photoconductor drive device 20Ya Motor shaft 20Y Drive motor 50Y Drum shaft 52Y Drum cylinder 53a Rear side drum flange part 53b Front side drum flange part 54Y Photosensitive drum unit 55a, 55b Shaft fitting hole 56 Side plate frame 57 Photoconductor Drum holding frame 60, 60 'Cover member 62 Main body frame 63 Drive frame 64 Drive side regulating member 71 Drive shaft gear 72 Motor shaft gear 83 First external gear 84 First internal gear 85 Intermediate transmission component 86 Second external gear 87 Second Internal gear 88 Support side plate 89 Cylindrical body 90 Mold 91 Upper mold 92 Lower mold 93 Cavity 95 Channel 96 Pin gate 97 Communication hole 98 Compressed gas supply source 99 Mold dividing line 100 Copying machine main body

Japanese Patent Laid-Open No. 2004-211789 JP 2011-197298 A JP2012-27120A

Claims (17)

A drive output shaft that rotates by receiving a driving force from a driving source provided in the image forming apparatus main body;
A rotator that can be attached to and detached from the image forming apparatus main body along the axial direction of the drive output shaft;
A drive side coupling portion provided on the drive output shaft;
A driven side coupling portion provided in the rotating body;
A first intermediate coupling portion that engages with the driving side coupling portion; and a second intermediate coupling portion that engages with the driven side coupling portion, the driving side coupling portion and the driven side cup. In the rotating body drive device having the intermediate transmission component supported by the ring portion,
The rotating body has an insertion hole through which the drive output shaft is inserted when mounted on the image forming apparatus main body.
A rotating body driving device configured to position the rotating body on the driving output shaft by inserting the driving output shaft into the insertion hole of the rotating body. The rotary body drive device according to claim 1,
The drive side coupling part is composed of a male spline member,
The rotating body drive device according to claim 1, wherein the first intermediate coupling portion of the intermediate transmission component is configured by a female spline member that engages with the male spline member. In the rotating body drive device according to claim 1 or 2,
The driven side coupling part is composed of a female spline member,
The rotating body drive device characterized in that the second intermediate coupling portion of the intermediate transmission component is constituted by a male spline member engaged with the female spline member. The rotating body drive device according to any one of claims 1 to 3,
At least one of the first intermediate coupling portion and the second intermediate coupling portion has a maximum tooth thickness at the center portion in the drive output shaft direction and is directed toward both ends in the drive output shaft direction. A rotating body drive device comprising a spline member having a tooth profile that reduces the tooth thickness. In the rotating body drive device according to claim 4,
The intermediate transmission component is a resin-molded product that is injection-molded using a plurality of molds that are mold-divided at a central portion in the drive output axial direction of the at least one intermediate coupling portion. apparatus. The rotary body drive device according to any one of claims 1 to 5,
The rotating body has two insertion holes at different positions in the drive output shaft direction,
Each insertion hole forming member that forms the two insertion holes has a tapered surface that tapers in a direction in which the drive output shaft enters toward the insertion hole when the rotating body is attached to the image forming apparatus main body. ,
A fixed taper member that is fixedly supported on the drive output shaft and has a tapered surface that abuts against the taper surface of one insertion hole forming member when the rotating body is mounted on the image forming apparatus body;
A movable tapered member that is supported so as to be slidable along the drive output shaft, and that has a tapered surface that abuts against the tapered surface of the other insertion hole forming member when the rotating body is mounted on the image forming apparatus body;
Biasing means for biasing the movable taper member in a direction in which the taper surface of the movable taper member is brought into contact with the taper surface of the other insertion hole forming member;
The drive output shaft is inserted into the insertion hole of the rotating body, and the taper of the fixed taper member and the movable taper member on the drive output shaft with respect to the taper surface of each insertion hole forming member by the biasing force of the biasing means. A rotator driving device characterized in that the rotator is positioned on the drive output shaft by contacting the surfaces. The rotary body drive device according to claim 6,
The rotating body drive device, wherein the fixed taper member is formed integrally with the drive output shaft. The rotary body drive device according to claim 6 or 7,
The movable taper member has a hole provided with the taper surface on the inner wall surface,
The other insertion hole forming member has a tapered surface that abuts the tapered surface of the movable tapered member on an outer wall surface thereof, and includes a plurality of members in which a plurality of slits are formed in the rotation direction of the drive output shaft. A rotating body drive device characterized by that. In the rotating body drive device according to any one of claims 1 to 8,
The intermediate transmission component includes a cylindrical portion in which a hole through which the drive output shaft is inserted penetrates in the axial direction.
A rotating body drive device comprising: a regulating member that abuts on an axial end of the cylindrical portion and regulates movement of the intermediate transmission component in the axial direction of the drive output shaft. The rotary body drive device according to claim 9, wherein
The contact surface of the restriction member that contacts the axial end of the cylindrical portion corresponds to the locus of the axial end of the cylindrical portion when the axis of the cylindrical portion is inclined with respect to the drive output shaft. A rotating body drive device having a curved shape. The rotary body drive device according to claim 10,
The curved surface shape of the contact surface of the restricting member is an axial end of the cylindrical portion when the intermediate transmission component rotates about a rotation axis orthogonal to the drive output shaft around the center of gravity of the intermediate transmission component. A rotating body drive device characterized by having a curved surface shape along the locus of the part. The rotating body drive device according to any one of claims 1 to 11,
Shielding that shields at least a part of a space between at least one of the first intermediate coupling portion and the second intermediate coupling portion in the intermediate transmission component and the outer peripheral surface of the rotating body. A rotating body drive device comprising a member. The rotary body drive device according to claim 12,
The driven side coupling part is composed of a female spline member,
The second intermediate coupling portion, which is the at least one intermediate coupling portion, is constituted by a male spline member that engages with the female spline member,
The shielding member is fixed to an edge of an opening of the driven side coupling portion into which the second intermediate coupling portion is inserted, and is provided so as to extend toward the drive output shaft. A rotating body drive device. The rotating body drive device according to claim 13,
The rotating member characterized in that the shielding member is composed of an elastic member that is deformable when the intermediate transmission component is displaced in the axial direction of the drive output shaft and abuts on the second intermediate coupling portion. Drive device. The rotary body drive device according to claim 12,
The driven side coupling part is composed of a female spline member,
The second intermediate coupling portion, which is the at least one intermediate coupling portion, is constituted by a male spline member that engages with the female spline member,
The shielding member is fixed to the second intermediate coupling portion, and extends to the outside in the radial direction of the drive output shaft from the opening of the driven side coupling portion into which the second intermediate coupling portion is inserted. A rotating body drive device characterized by being provided as described above. The rotary body drive device according to claim 15,
The shielding member is formed of an elastic member that is deformable when the intermediate transmission component is displaced in the axial direction of the drive output shaft and abuts against an edge of the opening of the driven side coupling portion. A rotating body drive device. In an image forming apparatus including a rotating body and a rotating body driving device including a rotating body and a drive transmission unit that transmits a driving force from a driving source to the rotating body.
An image forming apparatus using the rotating body driving device according to claim 1 as the rotating body driving device.