JP4469591B2 - Image forming apparatus cleaning device - Google Patents

Description

  The present invention relates to a cleaning device, and more particularly to a cleaning device for an image forming apparatus for removing impure products and residual toner on the surface of a photosensitive drum.

  The image forming apparatus mainly includes an image forming unit and a paper feeding unit that conveys paper. In this image forming apparatus, an image is formed in the image forming unit by transferring toner to a sheet conveyed by a sheet feeding unit. As described above, in order to form an image in the image forming apparatus, the image forming unit includes a charger, an exposure device, a developing device, and a cleaning device. In this image forming unit, a charger charges the surface of the photosensitive drum. Then, the exposure device exposes the charged photosensitive drum according to the image data. Thereby, an electrostatic latent image is formed on the surface of the photosensitive drum. Then, the electrostatic latent image formed on the surface of the photosensitive drum is developed by the developing device, and the toner image is transferred onto the paper (Patent Document 1).

At this time, the cleaning device removes impurity products and residual toner on the surface of the photosensitive drum. The cleaning device mainly includes a housing, a roller member, a pair of swing members, a biasing member, a cleaning blade, and a seal member. The housing has an internal space opened on the photosensitive drum side. The roller member is rotatably disposed in the internal space of the housing, and the impure product is removed by polishing the surface of the photosensitive drum. The pair of swing members are disposed at both axial ends of the roller member. The pair of swing members have a roller support portion and a mounting portion. The roller support part rotatably supports the rotating shaft of the roller member. The mounting portion is rotatably mounted on the housing. The mounting portion is rotatably mounted on the housing by using an attachment member such as a retaining ring. In such a pair of swing members, the roller support portion side can swing toward the photosensitive drum side with the mounting portion as a fulcrum. The biasing member is, for example, a coil spring, and is attached to the roller support portion side of the swing member. The swinging member is urged toward the photosensitive drum side using the tensile force of the urging member. Thereby, the roller member is brought into pressure contact with the photosensitive drum. The cleaning blade is attached to the housing so as to be in contact with the surface of the photosensitive drum, and removes residual toner. The seal member is attached to the housing so as to surround the roller member and the pair of swing members, and prevents the residual toner from scattering from the cleaning device.
JP 2000-112309 A

  In a conventional cleaning device, a pair of swing members are mounted on a housing together with a roller member. At this time, the pair of oscillating members are disposed at both axial ends of the roller member, and the roller support portions of the oscillating member rotatably support the rotating shaft of the roller member. And the mounting part of the rocking | swiveling member is rotatably mounted on the housing using the mounting member. In this state, the roller support portion side of the swing member is biased toward the photosensitive drum by the bias member with the mounting portion of the swing member as a fulcrum. A roller member rotatably supported by the roller support portion is brought into pressure contact with the photosensitive drum.

  In this way, in the pair of swinging members for pressing the roller member against the photosensitive drum, the swinging member itself is a relatively small member, so that the mounting portion which is a part of the swinging member becomes smaller. . The mounting work of the mounting member for fixing the mounting portion to the housing requires a precise and complicated work.

  Further, as described in Patent Document 1, the roller support portion of the swing member and the mounting position of the biasing member are on the opposite side with respect to the mounting portion of the swing member, and the biasing member is connected to the housing of the cleaning device. In the configuration that is stretched between the swing members, when the frictional force between the photosensitive member and the roller member changes and a large force is applied to the roller member, the frictional force between the photosensitive drum and the roller member is reduced. If the roller member changes and changes, especially when the roller member is not coupled to the photosensitive drum with a gear, the swinging member is easily twisted, and the roller member can be pressed against the photosensitive drum with a uniform force. Disappear. On the other hand, if the roller member is left in a state where it is pressed against the photosensitive drum without being rotated, permanent deformation may occur on the surface of the roller member. For example, since the roller member is often formed of foamed synthetic rubber or the like, if the state in which the roller member is not rotated for a long time at the time of shipment or the like continues, permanent deformation remains as a recess on the surface of the roller member. There is a fear.

  Further, a seal member is attached to the housing of the conventional cleaning device so as to surround the roller member and the pair of swinging members in order to prevent scattering of residual toner. When the seal member is attached to the housing in this way, the pair of swinging members that press the roller member against the photosensitive drum is a movable member, so that residual toner leaks from the vicinity of the pair of swinging members and is scattered. There is a risk of it.

  An object of the present invention is to make it easy to assemble a pair of oscillating members with a simple configuration, and for the pair of oscillating members to stably press the roller member against the photosensitive drum or to separate the roller member from the photosensitive drum. Is to be able to do that.

  Another object of the present invention is to prevent toner from leaking from the vicinity of a pair of swing members.

  According to a first aspect of the present invention, there is provided an image forming apparatus cleaning apparatus for removing impure products and residual toner on the surface of a photosensitive drum. The cleaning device includes a housing, a roller member, a pair of swing members, an urging member, and a cleaning blade. The housing has an internal space opened on the photosensitive drum side. The roller member is for removing the impure product by polishing the surface of the photosensitive drum, and is rotatably disposed in the internal space of the housing. The pair of swing members are disposed at both axial ends of the roller member. The pair of swing members have a roller support portion and a mounting portion. The roller support part rotatably supports the rotating shaft of the roller member. The mounting portion is rotatably mounted on the housing. Such a rocking member can be swung on the side of the photosensitive drum on the roller support part side with the mounting part as a fulcrum. The urging member is for pressing the roller member against the photosensitive drum, and is attached to the pair of swinging members. The cleaning blade is in contact with the surface of the photosensitive drum to remove residual toner. The cleaning blade is mounted on the housing so that the pair of swinging members can be prevented from coming out of the housing.

  In this cleaning device, the pair of swinging members is mounted on the housing together with the roller member. At this time, the pair of oscillating members are disposed at both axial ends of the roller member. In the pair of swing members, the roller support portion of the swing member rotatably supports the rotation shaft of the roller member. Then, the mounting portion of the swing member is rotatably mounted on the housing. Such a pair of swinging members is prevented from coming out of the housing by the cleaning blade. In this state, the urging member mounted on the pair of swing members presses the roller member against the photosensitive drum.

  Here, since the cleaning blade can regulate the withdrawal of the pair of swinging members from the housing, an attachment member for regulating the withdrawal of the pair of swinging members from the housing becomes unnecessary, and the pair of swinging members becomes unnecessary. The swing member can be easily assembled with a simple configuration.

  According to a second aspect of the present invention, there is provided the image forming apparatus cleaning apparatus according to the first aspect, wherein the urging member is disposed on the roller support portion side with respect to the mounting portion of the swing member. . A holding member for holding the urging member is provided in the housing. In this case, since the urging member is disposed on the roller support portion side of the swinging member and the holding member for holding the urging member is provided in the housing, the urging member can be operated stably. Can do. For this reason, even if the frictional force between the photosensitive drum and the roller member changes and the roller member fluctuates, the pair of rocking members are not easily twisted, and the roller member is stably pressed against the photosensitive drum. be able to.

  According to a third aspect of the present invention, there is provided a cleaning device for an image forming apparatus according to the first or second aspect, wherein the cleaning blade sandwiches the mounting portion of the pair of swing members with the housing. In this case, since the cleaning blade sandwiches the mounting portion of the pair of swing members with the housing, the cleaning blade interferes with the roller support portion side of the swing member even if the pair of swing members swings. Without any problem, the pair of swinging members can be prevented from coming out of the housing.

  According to a fourth aspect of the present invention, in the image forming apparatus cleaning apparatus according to any one of the first to third aspects, the release member can be detachably attached to the housing. The release member engages with the swing member and swings the swing member in a direction away from the photosensitive drum. Then, the roller member is separated from the photosensitive drum. In this case, since the release member is detachably attached to the housing and the release member is engaged with the swing member, the release member swings the swing member in a direction away from the photosensitive drum. The roller member can be separated from the photosensitive drum. In this way, when the roller member is not rotated for a long period of time while the roller member is in pressure contact with the photosensitive drum, the roller member is separated from the photosensitive drum by the release member and is permanently attached to the surface of the roller member. Distortion can be prevented from being formed.

  A cleaning device for an image forming apparatus according to a fifth aspect is the cleaning device for an image forming apparatus according to any one of the first to fourth aspects, further comprising a seal member. The seal member is for preventing scattering of residual toner. The seal member is attached to the housing and the pair of swing members so as to surround the roller member. In this case, since the seal member surrounding the roller member is attached not only to the housing but also to the pair of swing members, it is possible to prevent the toner from leaking from the vicinity of the pair of swing members.

  A cleaning device for an image forming apparatus according to a sixth aspect is the cleaning device for an image forming apparatus according to the fifth aspect, wherein the seal member includes a first seal member, a pair of second seal members, and a third seal member. is doing. The first seal member is attached to the housing between the housing and the cleaning blade. The pair of second seal members are attached to the pair of swing members at a position between the cleaning blade and the pair of swing members. The pair of third seal members are attached to housings located on both sides of the roller member. As described above, the seal member is divided into the first to third seal members and can be attached to the housing and the pair of swing members, so that the seal member can be easily attached to the housing and the pair of swing members. . Further, toner leakage from the vicinity of the pair of swing members can be prevented without hindering the operation of the pair of swing members.

  A cleaning device for an image forming apparatus according to a seventh aspect is the cleaning device for an image forming apparatus according to the sixth aspect, wherein a part of the second seal member is overlapped with an end of the first seal member, A part of the seal member is overlapped with a part of the second seal member. In this case, a part of the second seal member is overlapped with the end of the first seal member, and a part of the third seal member is overlapped with a part of the second seal member. Thus, by providing the overlapping portion on the seal member, it is possible to reliably prevent toner leakage from the vicinity of the pair of swing members.

  According to the present invention, since the cleaning blade can regulate the removal of the pair of swing members from the housing, the pair of swing members can be easily assembled with a simple configuration. Since the urging member is disposed on the roller support portion side of the swinging member and the holding member for holding the urging member is disposed in the housing, the urging member can be stably operated. For this reason, the pair of rocking members are not easily twisted, and the roller member can be stably brought into pressure contact with the photosensitive drum. Further, by installing the release member in the cleaning device, the roller member can be moved away from the photosensitive drum by swinging the swinging member in the direction away from the photosensitive drum. Further, since the seal member is attached to the housing and the pair of swinging members so as to surround the roller member, even if the pair of swinging members swings, the toner does not leak from the vicinity of the pair of swinging members. Can be.

  FIG. 1 is a schematic sectional view of a tandem type color printer according to an embodiment of the present invention. The color printer 1 is transported by image forming units 2M, 2Y, 2C, and 2B for each color for forming a color image, toner containers 3M, 3Y, 3C, and 3B for each color, and a transport belt 4 that transports paper. First to fourth transfer rollers 5M, 5Y, 5C, and 5B for transferring the toner images of the respective colors onto the paper, and a paper feed mechanism 6 that feeds the paper to the image forming units 2M, 2Y, 2C, and 2B; A fixing unit 7 for fixing the toner image transferred onto the paper and a discharge unit 8 are provided.

  The image forming units 2M, 2Y, 2C, and 2B form magenta, yellow, cyan, and black toner images, respectively, and are sequentially arranged in the horizontal direction along the conveyance belt 4 from the upstream side in the conveyance direction of the paper. Has been placed. Each of the image forming units 2M, 2Y, 2C, and 2B includes a photosensitive drum 10, a charger 11, an exposure device 12, a developing device 13, and a cleaning device 14. In these image forming units 2M, 2Y, 2C, and 2B, a charger 11, an exposure device 12, a developing device 13, and a cleaning device 14 are disposed around a photosensitive drum 10 having a photosensitive layer made of amorphous silicon or the like as an image carrier. Are arranged in order.

  As shown in FIG. 1, the fixing unit 7 includes a heating roller having a heater inside and a pressure roller pressed against the heating roller. A paper discharge conveyance path 27 is provided between the fixing unit 7 and the discharge unit 8. As with the paper feed transport path 22, the paper discharge transport path 27 includes a guide member and a plurality of roller pairs. The discharge unit 8 is formed on the upper surface of the apparatus, and the sheet that has passed through the fixing unit 7 is conveyed upward via the sheet discharge conveyance path 27 and discharged to the upper surface of the apparatus.

  The cleaning device 14 is for removing impurity products and residual toner on the surface of the photosensitive drum 10. As shown in FIG. 2, the cleaning device 14 mainly includes a housing 40, a roller member 41, a pair of swing members 50, a biasing member 51, a cleaning blade 43, and a seal member 44. ing. 2 shows a state in which the release member 45 is inserted between the swinging member 50 and the housing 40 for convenience of explanation, but the arrangement of the members is substantially the same even when the release member 45 is not inserted. It is. Here, the impure product is nitrogen oxide or the like generated when the photosensitive drum 10 of the charger 11 is charged, and the impure product such as nitrogen oxide enters the microstructure on the surface of the photosensitive drum. If these are impregnated, the impure product has a hygroscopic property, so that when the printer is used at high humidity, an image flow phenomenon may occur. In the present invention, the photosensitive drum 10 having an amorphous silicon photosensitive member as the photosensitive layer is used.

  The housing 40 is disposed in parallel with the rotation shaft 10 a of the photosensitive drum 10. The housing 40 has an internal space opened on the photosensitive drum 10 side. The roller member 41 is made of, for example, foamed synthetic rubber, and its outer peripheral surface polishes the outer peripheral surface of the photosensitive drum 10 to remove impure products. The roller member 41 is rotatably disposed in the internal space of the housing 40 so that the rotation shaft 41 a is parallel to the rotation shaft 10 a of the photosensitive drum 10.

  As shown in FIG. 3, the pair of swing members 50 are disposed at both ends of the roller member 41 in the direction of the rotation axis 41 a. As shown in FIG. 4, the pair of swing members 50 are formed long in the axial direction intersecting the rotation shaft 41 a of the roller member 41. The swing member 50 has a roller support portion 50a, a mounting portion 50b, a biasing member mounting portion 50c, and a release member engaging portion 50d. The roller support portion 50a is provided at one end of the swing member 50, and rotatably supports the rotation shaft 41a of the roller member 41. The mounting portion 50 b is provided at the other end portion of the swing member 50. The mounting portion 50b has a shaft portion 50e. The shaft portion 50e is parallel to the rotation shaft 41a of the roller member 41 in a state where the roller support portion 50a supports the rotation shaft 41a of the roller member 41. Is formed. In the shaft portion 50e, the mounting portion 50b is rotatably mounted on the housing 40. The swing member 50 is swingable on the roller support portion 50a side toward the photosensitive drum 10 with the shaft portion 50e of the mounting portion 50b as a fulcrum (see FIG. 2). The urging member mounting portion 50 c is provided for mounting a urging member 51 described later on the swing member 50. The urging member mounting portion 50c is formed integrally with the roller support portion 50a so as to protrude outward in the longitudinal direction of the swing member 50. The biasing member mounting portion 50c has an L-shaped cross-sectional shape. At this time, the L-shaped bottom surface 50f is provided on the photosensitive drum 10 side in parallel with the rotation shaft 41a of the roller member 41, and the L-shaped standing surface 50g is provided in a different direction that is difficult to rotate the rotation shaft 41a of the roller member 41. It has been. The release member engaging portion 50d is provided to engage the release member 45 described later with the swing member 50. The release member engaging portion 50d is integrally formed so as to protrude from the swinging member 50 between the roller support portion 50a and the mounting portion 50b. The release member engaging portion 50d is inclined toward the roller support portion 50a so that the angle with the swinging member 50 is an acute angle.

  As shown in FIG. 4, the urging member 51 is mounted in engagement with the urging member mounting portion 50 c. The urging member 51 includes, for example, a coil spring 51, and is disposed on the urging member mounting portion 50c in a state where the coil spring 51 is compressed. The distal end portion of the coil spring 51 is in contact with the L-shaped bottom surface 50 f of the biasing member mounting portion 50 c having an L-shaped cross section, and the proximal end portion of the coil spring 51 is in contact with the housing 40. And the outer peripheral surface of the coil spring 51 is arrange | positioned so that the L-shaped standing surface 50g of the biasing member mounting part 50c which has an L-shaped cross section may be followed. Further, the coil spring 51 is disposed on the biasing member mounting portion 50c so as to be within the axial width R of the mounting portion 50b including the shaft portion 50e (see FIG. 3). By attaching the coil spring 51 to the biasing member mounting portion 50c in this way, the roller support portion 50a side of the swing member 50 is biased toward the photosensitive drum 10 by the coil spring 51. Then, the roller member 41 is brought into pressure contact with the photosensitive drum 10. Further, the housing 40 is provided with a boss 52 that is a holding member for positioning the coil spring 51. The boss 52 is engaged with the inner peripheral portion of the coil spring 51, and the coil spring 51 can be stably operated in the axial direction. For this reason, even if the frictional force between the photosensitive drum 10 and the roller member 41 changes and the roller member 41 fluctuates, the pair of swinging members 50 are not easily twisted, and the roller member 41 is moved to the photosensitive drum. 10 can be kept in constant pressure contact with a uniform force.

  As shown in FIGS. 2 and 3, the cleaning blade 43 contacts the surface of the photosensitive drum 10 to remove residual toner. The cleaning blade 43 is formed in a plate shape that is long in the direction of the rotation shaft 41 a of the roller member 41. The cleaning blade 43 is mounted on the housing 40 so that the pair of swinging members 50 can be prevented from coming out of the housing 40. The cleaning blade 43 sandwiches the mounting portion 50b of the pair of swinging members 50 with the housing 40 via a seal member 44 described later. Both ends of the cleaning blade 43 in the longitudinal direction are fixed to the housing 40 with bolts.

  The seal member 44 is for preventing the residual toner from scattering. As shown in FIG. 3, the seal member 44 is attached to the housing 40 and the pair of swing members 50 so as to surround the roller member 41. The seal member 44 includes a first seal member 44a, a pair of second seal members 44b, and a third seal member 44c. The first seal member 44 a is attached to the housing 40 between the housing 40 and the cleaning blade 43. The pair of second seal members 44 b are attached to the pair of swing members 50 at positions between the cleaning blade 43 and the pair of swing members 50. A part of the pair of second seal members 44b is overlapped with the end portion of the first seal member 44a (region A in FIG. 3). The pair of third seal members 44 c are attached to the housing 40 located on both sides of the roller member 41. A part of the pair of third seal members 44c overlaps a part of the second seal member 44b (region B in FIG. 3).

  The release member 45 is formed in a rectangular bar shape. As shown in FIG. 2, the release member 45 includes a first bent portion 45a and a second bent portion 45b that are bent in directions in which both end portions are separated from each other, and a first bent portion 45a and a second bent portion. And a straight line portion 45c connecting the curved portion 45b. The first bent portion 45a is in contact with the housing 40 and is engaged with the roller support portion side of the release member engaging portion 50d. The straight portion 45 c is in partial contact with the housing 40. In the release member 45 that is arranged in the housing 40 and engages with the release member engaging portion 50d as described above, the second bent portion 45b is pressed toward the roller member 41 so that the linear portion 45c contacts the housing 40. Using the portion as a fulcrum, the first bent portion 45a swings in a direction away from the roller member 41. At this time, since the first bent portion 45a is engaged with the release member engaging portion 50d, the swing member 50 swings away from the photosensitive drum 10 via the release member engaging portion 50d. To do. Then, the roller member 41 is separated from the photosensitive drum 10. The distance between the roller member 41 and the photosensitive drum 10 at this time is, for example, about 1 mm. As shown in FIG. 2, the release member 45 is connected to the housing 40 as shown in FIG. 2 when the printer is expected to be in a state where the roller member 41 is in pressure contact with the photosensitive drum 10 in the same state for a long time. It is inserted between the swing members 50.

  The conveying belt 4 is circulated and driven between a driving roller 20 and a driven roller 21. The transport belt 4 sucks and transports the paper transported from the paper feed mechanism 6 through the paper feed transport path 22 in a substantially horizontal direction. The first to fourth transfer rollers 5M, 5Y, 5C, and 5B are disposed so as to face the photosensitive drums 10 of the image forming units 2M, 2Y, 2C, and 2B via the transport belt 4. Each of the first to fourth transfer rollers 5M, 5Y, 5C, and 5B is movable between an upper transfer position and a lower release position by a solenoid 23. Here, when the first to fourth transfer rollers 5M, 5Y, 5C, and 5B are moved upward and arranged at the transfer position, the sheet on the conveyance belt 4 comes into contact with the photosensitive drum 10. On the other hand, when the first to fourth transfer rollers 5M, 5Y, 5C, and 5B are moved downward and disposed at the release position, the sheet on the conveyor belt 4 and the photosensitive drum 10 are separated from each other.

  The paper feed conveyance path 22 is composed of a guide member serving as a conveyance guide and a plurality of roller pairs. On the most downstream side of the paper feed conveyance path 22, toner image formation and paper conveyance are performed. A registration roller pair 25 for synchronization is provided. A suction roller 26 is provided between the registration roller pair 25 and the first transfer roller 5M. In this example, the suction roller 26 is disposed above the driven roller 21 on which the conveyance belt 4 is hung, so as to face the driven roller 21. At this position, the suction roller 26 applies a bias voltage for suction to the leading end portion or the entire surface of the paper so that the paper is attracted to the transport belt 4.

Next, various operations during image formation will be briefly described.
When the print data from the computer is sent to the color printer 1, the print data is distributed to the image data for each color by the control unit of the color printer and appropriately processed. , And sent to the exposure unit 12. The surface of the photosensitive drum 10 is charged by a charger 11, and the surface of the photosensitive drum 10 is statically exposed by exposing the photosensitive drum 10 according to image data from an exposure device 12. An electrostatic latent image is formed. Then, the electrostatic latent image formed on the surface of the photosensitive drum 10 is developed by the developing device 13, and a toner image of each color is formed. When the toner image of each color passes through the photosensitive drum 10 corresponding to each color and the first to fourth transfer rollers 5M, 5Y, 5C, and 5B and is sequentially adsorbed by the conveyor belt 4, The image is transferred onto the paper. In this way, a color toner image is formed on the paper. The color toner image is fixed on the sheet by the action of heat and pressure when the sheet passes through the fixing unit 7, and then discharged to the sheet discharge unit 8 via the sheet discharge conveyance path 27.

  As described above, when a series of image forming operations are performed in the color printer 1, the roller member 41 and the cleaning blade 43 polish the outer peripheral surface of the photosensitive drum 10 in the cleaning device 14 and the outer periphery of the photosensitive drum 10. Impurities and residual toner are removed from the surface. In the roller member 41, a pair of swing members 50 are disposed at both ends of the roller member 41 in the direction of the rotation axis 41 a. In this pair of swing members 50, the roller support portion 50 a side of the swing member 50 is biased toward the photosensitive drum 10 by the coil spring 51 mounted on the bias member mounting portion 50 c of the swing member 50. Then, the roller member 41 is brought into pressure contact with the photosensitive drum 10. When the roller member 41 is rotated in this state, the impure product is removed from the outer peripheral surface of the photosensitive drum 10. Further, when the pair of swinging members 50 are swung in the direction away from the photosensitive drum 10 by the release member 45, the roller member 41 is separated from the photosensitive drum 10. Then, the pressure contact state between the roller member 41 and the photosensitive drum 10 is released. On the other hand, when the cleaning blade 43 is bolted to the housing 40 with the mounting portion 50b of the pair of swinging members 50 sandwiched between the housing 40 and the housing 40 via the seal member 44, the outer peripheral surface of the photosensitive drum 10 is fixed. It comes to contact with. By bringing the cleaning blade 43 into contact with the outer peripheral surface of the photosensitive drum 10 in this way, residual toner is removed from the outer peripheral surface of the photosensitive drum 10 when the photosensitive drum 10 rotates.

  In the conventional cleaning device 14, in the pair of swing members 50, the mounting portion 50 b of the swing member 50 is rotatably mounted on the housing 40 by a small mounting member. When trying to fix to 40, precise and complicated mounting work was required. Also, the roller support portion of the swing member and the mounting position of the biasing member are opposite to the mounting portion of the swing member, and the biasing member is spanned between the housing of the cleaning device and the swing member. In this configuration, the pair of swinging members are easily twisted, and the roller member may not be able to press against the photosensitive drum with a uniform force. On the other hand, even if the roller member 41 exerts a uniform pressure contact force on the photosensitive drum 10, the roller member 41 is left in a state where the roller member 41 is pressed against the photosensitive drum 10 without rotating the roller member 41 at the time of shipment. If this is done, permanent deformation may occur on the surface of the roller member 41. Further, since the seal member 44 is attached to the housing 40 so as to surround the roller member 41 and the pair of swinging members 50, residual toner leaks from the vicinity of the pair of swinging members 50 that are the movable portions. There was a risk of being scattered.

  In the cleaning device 14 of the present embodiment, the cleaning blade 43 holds the mounting portion 50b of the pair of swing members 50 with the housing 40 via the seal member 44, so the housing of the pair of swing members 50 An attachment member for restricting the withdrawal from 40 becomes unnecessary, and the pair of swing members 50 can be easily assembled with a simple configuration. The housing 40 is provided with a boss 52 that is a holding member for positioning the coil spring 51. As a result, the coil spring 51 can be stably operated in the axial direction, the pair of swinging members 50 are not easily twisted, and the roller member 41 can be stably pressed against the photosensitive drum 10. On the other hand, when the release member 45 is mounted on the housing 40, the roller support portion 50a side of the swing member 50 can be separated from the photosensitive drum 10 with the mounting portion 50b serving as a fulcrum. Accordingly, the roller member 41 attached to the roller support portion 50a can be separated from the photosensitive drum 10. That is, when the roller member 41 is not rotated for a long time in a state where the roller member 41 is in pressure contact with the photosensitive drum 10, the roller member 41 is separated from the photosensitive drum 10 by the release member 45. It is possible to prevent permanent deformation from being formed on the surface of 41. Further, since seal members 44 a, 44 b and 44 c surrounding the roller member 41 are attached not only to the housing 40 but also to the pair of swing members 50, toner does not leak from the vicinity of the pair of swing members 50. Can be.

[Other Embodiments]
(E) In the embodiment and the other embodiments, an example in which a color printer is used as the image forming apparatus has been described. However, the present invention can also be applied to other image forming apparatuses such as a color copying machine.

1 is a schematic cross-sectional configuration diagram of a color printer in which this embodiment is adopted. Sectional drawing of the cleaning apparatus vicinity of the said color printer. FIG. 3 is a partially enlarged view of the cleaning device viewed from the photosensitive drum side. The enlarged view of the rocking | swiveling member of the said cleaning apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Photosensitive drum 14 Cleaning apparatus 40 Housing 41 Roller member 43 Cleaning blade 44 Seal member 44a 1st seal member 44b 2nd seal member 44c 3rd seal member 45 Release member 50 Swing member 50a Roller support part 50b Mounting part 51 Energizing Member 52 Boss (holding member)

Claims (7)

A cleaning device for an image forming apparatus for removing impure products and residual toner on the surface of a photosensitive drum,
A housing having an internal space opened on the photosensitive drum side;
A roller member rotatably disposed in the internal space of the housing and polishing the surface of the photosensitive drum to remove the impure product;
The roller member is disposed at both ends in the axial direction of the roller member, and has a roller support portion that rotatably supports the rotation shaft of the roller member, and a mounting portion that is rotatably mounted on the housing. A pair of oscillating members capable of oscillating toward the photosensitive drum as fulcrums;
An urging member attached to the pair of swinging members and for pressing the roller member against the photosensitive drum;
The mounting portion of the pair of swinging members is sandwiched between the housing and the housing so that the pair of swinging members can be prevented from coming out of the housing and is in contact with the surface of the photosensitive drum. A cleaning blade for removing the residual toner;
An image forming apparatus cleaning apparatus comprising:   The said biasing member is arrange | positioned at the roller support part side with respect to the said mounting part of the said rocking | swiveling member, The holding member for hold | maintaining the said biasing member is provided in the said housing. A cleaning device for an image forming apparatus according to the description. A release member can be detachably attached to the housing, and the release member is engaged with the swing member to swing the swing member in a direction away from the photosensitive drum, the roller member is separated from the photosensitive drum, a cleaning device of an image forming apparatus according to claim 1 or 2. Attached to said housing and a pair of said swing member so as to surround the roller member further comprises a sealing member for preventing scattering of the residual toner, the cleaning of the image forming apparatus according to any one of claims 1 to 3 apparatus. The seal member is attached to the pair of swing members at a position between the first seal member attached to the housing between the housing and the cleaning blade and the pair of swing members. 5. The image forming apparatus cleaning device according to claim 4 , further comprising: a pair of second seal members and a pair of third seal members attached to the housing located on both sides of the roller member. Portion of the second sealing member is superimposed on an end portion of the first seal member, a portion of the third seal member is superimposed on a portion of the second seal member, according to claim 5 Image forming apparatus cleaning apparatus. An image forming apparatus comprising the cleaning device for an image forming apparatus according to claim 1.

Images