JP6429612B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus.

  Here, the image forming apparatus forms an image on a recording medium.

  Examples of the image forming apparatus include an electrophotographic copying machine and an electrophotographic printer (laser beam printer, LED printer, etc.).

  The recording medium is an image on which an image is formed using an electrophotographic image forming process. For example, recording paper, OHT sheet, label, and the like.

  2. Description of the Related Art An image forming apparatus in which a process cartridge is detachably attached to an image forming apparatus main body (apparatus main body) is known. According to this configuration, maintenance of the image forming apparatus can be performed by the user himself / herself without depending on the service person.

  As a method for exchanging process cartridges with respect to the image forming apparatus main body, Patent Document 1 discloses a configuration in which a plurality of process cartridges are mounted on a moving member and are attached to and detached from the image forming apparatus main body. In addition, a configuration is disclosed in which a moving member is used to determine the position of the process cartridge in the body width direction. It is disclosed that, by adopting the above configuration, a means for replacing the process cartridge from the front side of the apparatus can be provided in a space-saving manner.

JP 2013-97185 A

However, in the prior art, particularly when the main body of the moving member is made of plastic (resin), it has been a problem to ensure the strength of the moving member used for inserting and removing the process cartridge from the apparatus main body. For example, it is necessary to take measures such as increasing the size of the moving member and maintaining the strength of the moving member so that the moving member will not be damaged when the user applies a load to the moving member with the moving member pulled out from the apparatus main body. It was. In view of the above problems, an object of the present invention is to provide an image forming apparatus that maintains the strength of a moving member by developing the conventional configuration .

As described above, the typical configuration of the present invention is as follows.
In the image forming apparatus,
The device body;
A cartridge that is detachable from the apparatus main body, and includes a coupling member for inputting a driving force from the apparatus main body at one end in a longitudinal direction;
A moving member that moves between the inside and the outside of the apparatus main body while supporting the cartridge;
A guide portion provided in the apparatus main body for supporting and sliding the moving member when the moving member moves between the inside and the outside of the apparatus main body;
A first reinforcing member having a U-shaped portion covering a lower end portion of the moving member and supported in contact with the guide portion, the lower end portion of the moving member along a moving direction of the moving member A metal first reinforcing member for reinforcing the moving member;
An image forming apparatus comprising: a first reinforcing member; and a second reinforcing member disposed between the first reinforcing member and the moving member to reinforce the moving member.

  The strength of the cartridge tray (moving member) can be saved in a space-saving manner.

1 is a perspective view of an image forming apparatus according to Embodiment 1. FIG. 1 is a cross-sectional view of an image forming apparatus according to Embodiment 1. FIG. 1 is a cross-sectional view of an image forming apparatus according to Embodiment 1. FIG. 1 is a cross-sectional view of an image forming apparatus according to Embodiment 1. FIG. 1 is a cross-sectional view of an image forming apparatus according to Embodiment 1. FIG. (A) is a perspective view which shows the state which the opening-and-closing door closed. (B) It is a perspective view which shows the state which the opening-and-closing door opened. (C) It is a perspective view which shows the state which pulled out the cartridge tray. (A) It is sectional drawing which shows the state which the opening-and-closing door closed. (B) is sectional drawing which shows the state which the opening-and-closing door opened. 1 is a perspective view of a process cartridge according to Embodiment 1. FIG. 1 is a cross-sectional view of a process cartridge according to Embodiment 1. FIG. 3 is a perspective view of a process cartridge and a cartridge tray according to Embodiment 1. FIG. 2 is a perspective view of a cartridge tray according to Embodiment 1. FIG. FIG. 2 is a cross-sectional perspective view (a) and an enlarged view (b) of the cartridge tray according to the first embodiment. 6 is a perspective view of a process cartridge according to Embodiment 2. FIG. FIG. 6 is a perspective view of a process cartridge and a cartridge tray according to a second embodiment. 6 is a perspective view of a cartridge tray according to Embodiment 2. FIG. FIG. 6 is a cross-sectional view (a) and an enlarged view (b) of a process cartridge and a cartridge tray according to a second embodiment. FIG. 10 is a cross-sectional view of an image forming apparatus in which an exposure apparatus according to another embodiment is disposed below the image forming apparatus main body and a process cartridge is replaced with a cartridge tray.

Example 1
1 to 5 show a laser beam printer which is an image forming apparatus of this embodiment. The overall configuration and function of this laser beam printer will be described.

[Outline of image forming apparatus]
FIG. 2 is a cross-sectional view of the overall configuration of the image forming apparatus of this embodiment. A laser scanner 11, an intermediate transfer belt 13, a fixing film 24, a pressure roller 25, a paper feed tray 19, a paper feed roller 20, etc. are installed in the main body (hereinafter referred to as “apparatus main body”) 100 of the image forming apparatus. Has been.

  In addition, four process cartridges P (PY, PM, PC, PK) of the first process cartridge PY, the second process cartridge PM, the third process cartridge PC, and the fourth process cartridge PK are arranged in the horizontal direction. ing. Each of the first to fourth process cartridges P (PY, PM, PC, PK) has the same electrophotographic image forming process mechanism, and the color of the developer is different.

  Each of the first to fourth process cartridges P (PY, PM, PC, PK) includes a developing unit 4 including a developing roller 41 that develops an electrostatic latent image on the photosensitive drum 1.

  The first process cartridge PY contains a yellow (Y) developer in the developing unit 4 and forms a yellow developer image on the surface of the photosensitive drum 1.

  The second process cartridge PM contains a magenta (M) developer in the developing unit 4 and forms a magenta developer image on the surface of the photosensitive drum 1.

  The third process cartridge PC contains a cyan (C) developer in the developing unit 4 and forms a cyan developer image on the surface of the photosensitive drum 1.

  The fourth process cartridge PK contains a black (K) developer in the developing unit 4 and forms a black developer image on the surface of the photosensitive drum 1.

  The paper (recording medium) S stacked and stored in the paper feed tray 19 is fed by a paper feed roller 20 that rotates in the clockwise direction (in the direction of arrow W) in the figure, and the belt drive roller 14 and the secondary transfer roller 18 It is sent to the contact part (hereinafter referred to as “nip part”).

  The photosensitive drum 1 rotates counterclockwise (arrow K direction) in the figure, and an electrostatic latent image is sequentially formed on the outer peripheral surface by the laser light L from the laser scanner 11, and then the electrostatic drum image is electrostatically charged. The latent image is developed by the developing roller 41 to form a toner image (developer image).

  The photosensitive drum 1 is an image carrier that carries an image (toner image). The developing roller 41 is a developer carrying member that carries a developer (toner) for developing the electrostatic latent image.

  The toner image formed on the photosensitive drum 1 is transferred to an intermediate transfer belt 13 as an intermediate transfer member. When forming a color image, yellow, magenta, cyan, and black colors are developed on the photosensitive drum 1, and the toner images formed on the respective colors are sequentially transferred to the intermediate transfer belt 13. Next, the toner image formed on the intermediate transfer belt 13 is transferred to the sheet S sent to the nip portion between the belt driving roller 14 and the secondary transfer roller 18. In this embodiment, the toner image on the photosensitive drum 1 is once transferred to the intermediate transfer belt 13 and then transferred to the paper S. However, the toner image may be directly transferred from the photosensitive drum 1 to the paper S. In this case, instead of the intermediate transfer belt 13, a conveyance belt (conveyance member) that conveys the recording medium (paper S) is provided, and the yellow, magenta, cyan, and black colors of the paper S conveyed by the conveyance belt are provided. The toner images may be transferred sequentially.

  The sheet S on which the toner image has been transferred is sent to the nip portion between the fixing film 24 and the pressure roller 25, where it is heated and pressed to fix the toner image on the sheet S. The sheet S on which the toner image is fixed is discharged to a discharge tray 27 by a discharge roller pair 26.

[Overview of process cartridge replacement method]
3 to 5 are diagrams for explaining a process cartridge replacement method according to this embodiment.

  Hereinafter, a method for replacing the process cartridge P of the laser beam printer will be described.

  A moving member that moves relative to the apparatus main body 100 while holding the process cartridges PY, PM, PC, and PK is referred to as a cartridge tray 28 in the following description. The process cartridge P can be detached from and attached to the cartridge tray 28. The cartridge tray 28 is made of plastic (resin).

  The cartridge tray 28 is supported by a cartridge tray holding member (hereinafter referred to as “tray holding member”) 32 with respect to the apparatus main body 100 and is slidable in the lateral direction of FIG. 3.

  As shown in FIG. 3, the space inside the apparatus main body 100 is a mounting portion for the process cartridge P. When the process cartridge P is placed (attached) on the cartridge tray 28, the process cartridge P moves toward the attachment portion of the apparatus main body 100 and is attached to the apparatus main body 100. That is, the process cartridge P can be attached to and detached from the mounting portion of the apparatus main body 100.

  The opening / closing door 30 is provided so as to be rotatable with respect to the apparatus main body 100, and FIG. 3 shows a state in which the opening / closing door 30 is opened. The opening / closing door 30 is an opening / closing member that opens and closes an opening through which the cartridge tray 28 passes. By opening the open / close door 30 in the direction of arrow D in FIG. 3, the user can access a cartridge tray handle portion (hereinafter referred to as “handle portion”) 29.

  A connecting arm 33 is provided to connect the opening / closing door 30 and the tray holding member 32. The connecting arm 33 and the tray holding member 32 constitute interlocking means (interlocking mechanism) that moves the cartridge tray 28 in conjunction with the opening / closing operation of the opening / closing door 30. That is, when the opening / closing door 30 is opened from the closed state (see FIG. 2), the connecting arm 33 moves the cartridge tray 28 upward by pulling the tray holding member 32 upward to the right (FIG. 3). reference). At this time, the photosensitive drum 1 is separated from the intermediate transfer belt 13, and the cartridge tray 28 can be pulled out from the apparatus main body 100. That is, the user can pull out the cartridge tray 28 by pulling the handle portion 29.

  At this time, the process cartridge P placed on the cartridge tray 28 is also moved in the direction intersecting the axis of the photosensitive drum 1 and pulled out of the apparatus main body 100.

  FIG. 6 is a perspective view of the image forming apparatus. FIG. 6A shows a state in which the opening / closing door 30 is closed, and FIG. 6B shows a state in which the opening / closing door 30 is opened. FIG. 6C shows a state where the cartridge tray 28 is further pulled out from the inside of the apparatus main body 100 of the image forming apparatus. FIG. 7 is an enlarged view of the opening / closing door 30 and the cartridge tray 28. FIG. 7A shows a state where the open / close door 30 is closed, and FIG. 7B shows a state where the open / close door 30 is opened.

  As shown in FIG. 7A, a connecting arm 33 is attached to the opening / closing door 30, and a boss 33 a provided on the connecting arm 33 engages with a groove 32 b provided on the tray holding member 32. Yes. Thereby, the opening / closing operation of the opening / closing door 30 and the tray holding member 32 are interlocked. That is, the tray holding member 32 has a boss 32 a, and this boss 32 a is engaged with a groove 101 a provided on the side plate 101 of the apparatus main body 100. When the opening / closing door 30 is opened from the closed state (see FIG. 7A), the tray holding member 32 moves along the groove 101a of the side plate 101 in the direction of the arrow D1 shown in FIG.

  Here, since the groove 101a of the side plate 101 has a step, when the tray holding member 32 moves, it moves not only in the horizontal direction but also in the upward direction by a distance L1. For this reason, the cartridge tray 28 held by the tray holding member 32 also moves L1 upward. At this time, if the process cartridge P is mounted on the cartridge tray 28, the photosensitive drum 1 is separated from the intermediate transfer belt 13.

  This is the state shown in FIG. 3, and the cartridge tray 28 is in the retracted position (first internal position). The cartridge tray 28 is located inside the apparatus main body 100, but the photosensitive drum 1 is separated from the intermediate transfer belt 13 (the photosensitive drum 1 is retracted from the intermediate transfer belt 13). Therefore, when the cartridge tray 28 is in the retracted position, the cartridge tray 28 is movable with respect to the apparatus main body 100.

  In this state, when the user pulls the handle 29 shown in FIG. 6 (b), the cartridge tray 28 is pulled out of the apparatus main body 100 as shown in FIG. 6 (c) and is pulled out (external position, cartridge attaching / detaching position). )

  The photosensitive drum 1 of the process cartridge P is prevented from rubbing against the intermediate transfer belt 13 when the cartridge tray 28 moves from the retracted position to the drawn position. FIG. 4 is a cross-sectional view showing a state in which the cartridge tray 28 is pulled out from the inside of the apparatus main body 100 in the direction of arrow C (a state where the cartridge tray 28 is in the pulling position). The drawing position is a position at which the process cartridge P (PY, PM, PC, PK) can be attached to and detached from the cartridge tray 28. That is, the top surfaces of the process cartridges PY, PM, PC, and PK are opened with the cartridge tray 28 in the drawer position, and the respective process cartridges PY, PM, PC, and PK are moved upward (in the direction of arrow E) as shown in FIG. Can be removed.

  When the process cartridge P is attached to the apparatus main body 100, the cartridge tray 28 is pulled out and the process cartridge P is loaded in the reverse procedure, and then the cartridge tray 28 is accommodated in the apparatus main body 100. At this time, the process cartridge P placed on the cartridge tray 28 also moves in a direction crossing the axis of the photosensitive drum and moves toward the mounting portion of the apparatus main body 100.

  Then, by closing the opening / closing door 30 after the cartridge tray 28 is stored in the apparatus main body 100, the tray holding member 32 is pushed down in the lower left direction in FIG. 3 via the connecting arm 33. As a result, the cartridge tray 28 also moves downward, and the photosensitive drum 1 of the process cartridge P contacts the intermediate transfer belt 13. That is, by closing the opening / closing door 30, the cartridge tray 28 is mounted at the mounting position inside the apparatus main body 100. At the same time, the process cartridge P is disposed at a position where the photosensitive drum 1 is brought into contact with the intermediate transfer belt 13 and image formation is possible (see FIG. 2).

  That is, when the cartridge tray 28 is mounted inside the apparatus main body 100 and the open / close door 30 is closed, the cartridge tray 28 moves to the image forming position (second internal position). The image forming position is a position for arranging the process cartridge P supported by the cartridge tray 28 at a position where image formation is possible.

  That is, when the cartridge tray 28 moves to the image forming position, the process cartridge P supported by the cartridge tray 28 is supported by the apparatus main body 100, and the image can be formed. That is, the photosensitive drum 1 is in contact with the intermediate transfer belt 13 as shown in FIG.

  In the present embodiment, the configuration in which the contact state and the separation state of the photosensitive drum 1 and the intermediate transfer belt 13 are switched in conjunction with the opening / closing of the opening / closing door 30 is shown. However, as described above, a transport belt for transporting the paper S may be provided instead of the intermediate transfer belt 13. In this case, the contact state and separation state of the photosensitive drum 1 and the conveyance belt may be switched in conjunction with opening / closing of the opening / closing door 30.

  FIG. 8 is an external perspective view of the process cartridges PY, PM, PC, and PK. As described above, the process cartridges PY, PM, PC, and PK have the same electrophotographic process mechanism, and the toner color and the toner filling amount are different from each other.

[Description of process cartridge overview]
FIG. 8 is an external perspective view of the process cartridges PY, PM, PC, PK. As described above, the process cartridges PY, PM, PC, and PK have the same electrophotographic process mechanism, and the toner color and the toner filling amount are different from each other.

  The process cartridge P is a horizontally long box type assembly in which the axial direction (longitudinal direction) of the photosensitive drum 1 is the left-right direction and the left-right direction is the longitudinal direction. The photosensitive drum 1 is rotatably supported by a driving side cartridge cover member 46 disposed on the right side surface portion of the cleaner unit 5 and a non-driving side cartridge cover member 47 disposed on the left side surface portion. A drum coupling member (not shown) as a photosensitive drum drive input unit and a development coupling member (not shown) as a drive input unit to the development roller 41 in the development unit 4 are provided at the drive side shaft end of the process cartridge P. As shown). A cartridge electrical contact (not shown) is disposed on the left side surface. In the process cartridge P described above, the drum coupling member to which the driving force is transmitted from the apparatus main body 100 and the right side surface provided with the developing coupling member are the driving side, and the left side surface on the opposite side is the non-driving side. It is.

  FIG. 9 is a cross-sectional view showing a cross section when the process cartridge P is cut in a direction perpendicular to the axial direction of the photosensitive drum 1. The driving force from the apparatus main body 100 is transmitted to the drum coupling member and the developing coupling member of the process cartridge P. As a result, in FIG. 9, the photosensitive drum 1 is rotationally driven at a predetermined speed in the counterclockwise direction (arrow K direction) and the developing roller 41 in the clockwise direction (arrow L direction).

  In this embodiment, the process cartridge P includes a cleaner unit 5 and a developing unit 4 that is rotatably coupled to the cleaning unit 5. The cleaner unit 5 is a first unit (photosensitive drum unit) that holds the photosensitive drum 1, and the developing unit 4 is a second unit that holds the developing roller 41.

  The charger 3 provided in the cleaner unit 5 is a contact charging type charging member that abuts on the photosensitive drum 1 and rotates in a driven manner. The cleaning blade 51 is an elastic rubber blade and is disposed with its tip portion in contact with the photosensitive drum 1. The cleaning blade 51 serves to remove toner remaining on the photosensitive drum 1. The transfer residual toner removed by the cleaning blade 51 is accommodated in a toner accommodating portion 52 in the cleaner unit 5.

  The developing unit 4 includes a developing roller 41 as a developing unit and a developing blade 42. The developing unit 4 further has a developing chamber (developer containing portion) 43 for containing toner.

  As shown in FIG. 9, the developing roller 41 is disposed in the developing chamber 43, and the developing blade 42 is disposed in contact with the developing roller 41 at the tip. The developing blade 42 serves to regulate the toner carried on the peripheral surface of the developing roller 41 into a thin layer.

[Description of cartridge tray configuration]
FIG. 10 is an external perspective view when the process cartridges PY, PM, PC, and PK are mounted on the cartridge tray 28. Process cartridges PY, PM, PC, and PK are mounted at predetermined positions on the cartridge tray 28.

  FIG. 11 is a perspective view of the cartridge tray 28. As first reinforcing members (reinforcing members that reinforce the cartridge tray 28), reinforcing sheet metals 60 and 62 are provided at the lower edge of the cartridge tray 28 (lower end portion: the lowest portion of the cartridge tray in the direction of gravity). Yes. The reinforcing sheet metal means a reinforcing member formed from a metal plate.

  The reinforcing sheet metal 60 is attached to the cartridge tray 28 at one end in the direction (D2 direction in FIG. 6C) orthogonal to the moving direction of the cartridge tray 28 (D1 direction in FIG. 6C). Reinforce.

  On the other hand, the reinforcing sheet metal 62 reinforces the cartridge tray 28 on the other end side in the direction orthogonal to the moving direction of the cartridge tray 28.

  More specifically, the configuration of the reinforcing sheet metals 60 and 62 is such that the reinforcing sheet metals 60 and 62 extend along the moving direction of the cartridge tray 28 and are arranged so as to cover the lower end portion of the cartridge tray 28. ing.

  The reinforcing sheet metals 60 and 62 are sliding portions that slide with the tray holding member 32 provided in the apparatus main body. The reinforcing metal plates 60 and 62 can improve the slidability between the cartridge tray 28 and the tray holding member 32, improve the wear resistance of the cartridge tray 28, and improve the durability of the cartridge tray 28.

  Here, the tray holding member 32 is a guide portion that slides the cartridge tray 28 in and out of the apparatus main body 100 while supporting the cartridge tray 28 by contacting the cartridge tray reinforcing members 60 and 62. That is, by being guided by the tray holding member 32, the cartridge tray 28 moves in and out of the apparatus main body.

  The cartridge tray 28 is provided with a partition 50 for user identification of each process cartridge PY, PM, PC, PK mounting position. Recognized color labels LY, LM, LC, and LK are attached to the partition 50 according to the color of the toner filled in the process cartridges PY, PM, PC, and PK. The color labels LY, LM, LC, and LK can be recognized by a user standing in front of the apparatus main body when the process cartridges PY, PM, PC, and PK are not attached. When the process cartridges PY, PM, PC, and PK are attached, they are hidden, and the user can recognize colors that are not attached.

  FIG. 12 is a cross-sectional perspective view of the cartridge tray 28 and an enlarged view thereof. The reinforcing member provided on the cartridge tray 28 includes a reinforcing sheet metal (first reinforcing member) 60 bent into a U shape (square U shape) and a thick flat reinforcing sheet metal (second reinforcing member) as shown in the figure. Member) 61. The reinforcing sheet metal means a reinforcing member (a member that reinforces the cartridge tray 28) formed from a metal plate.

  As shown in FIG. 12, the reinforcing sheet metal 60 has a U-shaped portion whose end faces upward, and protrudes downward from the cartridge tray 28 as shown in FIG. Covered part).

The reinforcing sheet metal 60 is at least partially covered with the cartridge tray 28 in the vicinity of the end. That is, as disclosed in FIG. 12B, the cartridge tray 28 has a portion protruding to the left in the vicinity of the lower end. Therefore, the cartridge tray 28 is close to the end of the reinforcing sheet metal 60 (the left end in FIG. 12) from above. That is, the left end of the reinforcing sheet metal 60 is covered with the cartridge tray 28. By doing so, it is possible to prevent the user from touching the end of the reinforcing sheet metal 60. For the portion covered with the cartridge tray 28, the end portion of the reinforcing sheet metal 60 can be omitted from chamfering. In order to satisfy the strength of the cartridge tray 28 with only the reinforcing sheet metal 60, the bending of the reinforcing sheet metal 60 It is necessary to increase the height (a) with respect to the width (b). In order to increase the rigidity of the reinforcing sheet metal 60, increasing the sheet metal thickness is also effective.

  In the present embodiment, the strength is further improved by additionally providing a flat reinforcing sheet metal (second reinforcing member) 61 that is relatively easy to process. The reinforcing sheet metal 61 is disposed so as to be sandwiched between the reinforcing sheet metal 60 and the cartridge tray 28. Since the reinforcing sheet metal 61 is a flat sheet metal that does not need to be bent, it is possible to use a sheet metal (such as high-tensile steel) that has a high tensile strength that is likely to cause a molding defect in the bending process. Can be done in a space-saving manner.

  As a result, the cartridge tray 28 can be provided with strength without increasing the size of the apparatus main body 100. Even if the user applies a load to the cartridge tray 28, the cartridge tray 28 can be prevented from being damaged.

  The reinforcing sheet metal 62 provided on the other end side of the cartridge tray 28 has the same configuration as the reinforcing sheet metal 60. A reinforcing sheet metal 63 is also provided as a second reinforcing member on the other end side of the cartridge. The reinforcing sheet metal 63 is a flat reinforcing member having the same configuration as that of the reinforcing sheet metal 61.

  In this embodiment, the belt 13 is an intermediate transfer member. However, the present embodiment is also applied to a configuration in which a recording medium is passed between the photosensitive drum 1 and the belt 13 and an image on the photosensitive drum 1 is directly transferred to the recording medium. A process cartridge attaching / detaching mechanism similar to the example can be realized.

  That is, in the present embodiment, an intermediate transfer belt (ITB: Intermediate Transfer Belt) on which the toner image is transferred from the photosensitive drum 1 is used as a belt member that conveys the toner image. However, a recording medium conveyance belt that conveys a recording medium (paper) may be used as the belt member. An example of the recording medium conveyance belt is an ETB (Electrostatic Transfer Belt). In the ETB, a recording medium (paper) is attracted to a belt using an electrostatic attraction force, and the recording medium is conveyed by rotation of the belt. Then, the toner image is conveyed from the photosensitive drum 1 to the recording medium conveyed by the belt.

  That is, an intermediate transfer belt (ITB) on which the toner image is transferred from the photosensitive drum 1 may be used as a transfer unit (transfer belt, transfer device) that transfers the toner image from the photosensitive drum 1. Alternatively, an electrostatic conveyance belt (ETB) that conveys a recording medium onto which the toner image is transferred from the photosensitive drum 1 may be used as the transfer unit.

  As described above, the image forming apparatus according to the present exemplary embodiment attaches and detaches the process cartridge to and from the apparatus main body 100 by the operation of moving the cartridge tray 28 in the arrangement direction of the process cartridges arranged in a substantially horizontal direction. Thus, the process cartridges PY, PM, PC, and PK can be easily replaced by an operation from the front surface of the apparatus main body 100.

  Further, by increasing the rigidity of the cartridge tray 28, it is possible to prevent the cartridge tray 28 from being damaged even if a load is applied to the cartridge tray 28 when the process cartridges PY, PM, PC, and PK are replaced. Thereby, the durability of the cartridge tray 28 is improved.

Example 2
In this embodiment, a modified example of the process cartridges PY, PM, PC, PK and the cartridge tray 28 is shown. In this embodiment, the description will be focused on the configuration different from the second embodiment, and the description of the same configuration will be omitted.

  FIG. 13 is an external perspective view of the process cartridges PY, PM, PC, PK. The process cartridge P is provided with an electrical contact portion 47b that contacts the contact portion 48b of the cartridge tray contact portion 48 provided on the side surface of the cartridge tray 28. The electrical contact portion 47b also serves as a drum ground contact portion, and is electrically connected to the photosensitive drum 1 within the process cartridge P (not shown). The contact portion is made of a conductive material such as a conductive resin or a metal shaft.

  FIG. 14 is an external perspective view when the process cartridge is mounted on the cartridge tray. Process cartridges PY, PM, PC, and PK are mounted at predetermined positions on the cartridge tray 28. FIG. 15 is an external perspective view of the cartridge tray 28. A cartridge tray contact portion 48 that is electrically connected to the cartridge contact portion 47b of each process cartridge PY, PM, PC, PK is provided. The cartridge tray contact portion 48 is also electrically connected to the cartridge tray reinforcing sheet metal (first reinforcing member) 62, and is connected to the same potential as the electrical contact portions of the process cartridges PY, PM, PC, and PK.

  That is, the reinforcing sheet metal 62 also serves as an electrical contact for electrically connecting the apparatus main body 100 and the process cartridge P. In other words, the process cartridge P is electrically connected to the apparatus main body 100 via the reinforcing sheet metal 62.

  More specifically, the reinforcing sheet metal 62 is electrically connected to an electrical contact portion (not shown) of the apparatus main body 100, and the ground of the photosensitive drum 1 of the process cartridges PY, PM, PC, PK is connected to the apparatus. The main body 100 is also electrically connected.

  FIG. 16 is a sectional view of the cartridge tray 28 and the process cartridges PY, PM, PC, PK and an enlarged view of the sectional view. The cartridge tray contact 48 provided on the cartridge tray 28 is electrically connected to the cartridge reinforcing sheet metal 62 and the cartridge contact 47b on the process cartridges PY, PM, PC, and PK through the electrical contacts 48a and 48b, respectively.

  In the present embodiment, the cartridge tray contact portion 48 provided on the cartridge tray 28 is provided with a leaf spring-shaped contact portion. However, any conductive member having spring properties such as a wire spring or the like can be secured. For example, the structure which touches the reinforcing sheet metal 62 directly may be used. Thus, by using the cartridge tray reinforcing sheet metal 62 as a path for electrically connecting the photosensitive drums 1 of the process cartridges PY, PM, PC, and PK, the space of the apparatus main body can be used efficiently and the apparatus main body can be enlarged. Can be suppressed.

  In the above-described embodiments, the configuration in which the ground of the photosensitive drum 1 is connected to the apparatus main body 100 has been described. However, this process cartridge PY, PM, PC, PK is connected to other electrical contact portions that have the same potential. A configuration may be used.

  In the above-described embodiment, the configuration in which the exposure apparatus 11 is disposed above the apparatus main body 100 with respect to the photosensitive drum 1 has been described. However, as shown in FIG. 17, the apparatus main body may be configured such that the exposure device 11 is installed below the photosensitive drum 1 and the process cartridges PY, PM, PC, and PK are inserted into and removed from the cartridge tray 28.

  In the above-described embodiment, four cartridges that can be attached to and detached from the image forming apparatus main body are used. However, the number of cartridges used is not limited and may be set as needed.

  In the above-described embodiment, as a cartridge that is detachable from the main body of the image forming apparatus, a process cartridge that integrally includes a photosensitive drum and a charging unit, a developing unit, and a cleaning unit as process units that act on the photosensitive drum. Was illustrated. However, the configuration of the cartridge is not limited to this. For example, the photosensitive drum may be fixed to the cartridge tray 28, and separately from the photosensitive drum, a charging unit, a developing unit, a cleaning unit, and the like may be detachably attached to the cartridge tray 28 as a cartridge. As another configuration of the cartridge that can be attached to and detached from the cartridge tray 28, a developing cartridge in which the developing roller 41 is formed into a cartridge separately from the photosensitive drum 1 can be considered.

  In the above-described embodiment, the printer is exemplified as the image forming apparatus, but the present invention is not limited to this. For example, the image forming apparatus may be another image forming apparatus such as a copying machine or a facsimile machine, or another image forming apparatus such as a multi-function machine combining these functions. The same effect can be obtained by applying the configuration of the present embodiment to these image forming apparatuses.

1 Photosensitive drum 28 Cartridge tray 30 Open / close door (open / close member)
60, 62 Reinforcing sheet metal (first reinforcing member)
61, 63 Reinforcing sheet metal (second reinforcing member)
47b Cartridge contact section 48 Cartridge tray contact section 100 Apparatus main body (image forming apparatus main body)
L Laser light S Paper P (PY, PM, PC, PK) Process cartridge

Claims (8)

In the image forming apparatus,
The device body;
A cartridge that is detachable from the apparatus main body, and includes a coupling member for inputting a driving force from the apparatus main body at one end in a longitudinal direction ;
A moving member that moves between the inside and the outside of the apparatus main body while supporting the cartridge;
A guide portion provided in the apparatus main body for supporting and sliding the moving member when the moving member moves between the inside and the outside of the apparatus main body;
A first reinforcing member having a U-shaped portion covering a lower end portion of the moving member and supported in contact with the guide portion, the lower end portion of the moving member along a moving direction of the moving member A metal first reinforcing member for reinforcing the moving member;
An image forming apparatus comprising: a first reinforcing member; and a second reinforcing member disposed between the first reinforcing member and the moving member to reinforce the moving member .   The image forming apparatus according to claim 1, wherein the first reinforcing member is provided on one end side and the other end side in a direction orthogonal to a moving direction of the moving member. Wherein at least a portion of the end portion of the first reinforcing member, an image forming apparatus according to claim 1 or 2, characterized in that the upper is covered by said moving member. The first through the reinforcing member, the cartridge image forming apparatus according to any one of claims 1 to 3, characterized in that connected to the apparatus body and electrically.   The image forming apparatus according to claim 1, wherein the cartridge includes a photosensitive member. The cartridge, an image forming apparatus according to any one of claims 1 to 5, characterized in that it has a developing roller for developing a carrying latent image developer. The moving member is an image forming apparatus according to any one of claims 1 to 6, characterized in that is made of resin. 8. The first reinforcing member and the second reinforcing member are disposed below the coupling member in a state where the cartridge is supported by the moving member. The image forming apparatus according to claim 1.

Images