Electrophotographic image forming apparatus

• US 7,937,020 B2
• Filed: 03/26/2010
• Issued: 05/03/2011
• Est. Priority Date: 01/11/2006
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Sakurai, Hiromi, Noguchi, Tomio, Imaizumi, Chikara
• Primary Examiner(s): Walsh; Ryan D
• Application Number:
  US12/732,558
• Publication Number:
  US 20100209139A1
• Time in Patent Office: 403 Days
• Field of Search: 399/107, 399/110, 399/111, 399/113, 399/121
• US Class Current: 399/110
• CPC Class Codes: G03G 15/0136 transfer member separable from recording member or vice versa, mode switching
• CPC Class Codes: G03G 15/0178 using more than one reusable electrographic recording member, e.g. one for every monocolour image
• CPC Class Codes: G03G 15/0189 primary transfer to an intermediate transfer belt G03G15/0184 takes precedence
• CPC Class Codes: G03G 15/0194 primary transfer to the final recording medium G03G15/0184 takes precedence
• CPC Class Codes: G03G 21/1623 Means to access the interior of the apparatus
• CPC Class Codes: G03G 21/1633 using doors or covers G03G21/1638 takes precedence
• CPC Class Codes: G03G 21/1647 Mechanical connection means
• CPC Class Codes: G03G 21/1842 for guiding and mounting the process cartridge, positioning, alignment, locks G03G21/1864 and G03G21/1871 take precedence
• CPC Class Codes: G03G 21/1853 the process cartridge being mounted perpendicular to the axis of the photosensitive member
• CPC Class Codes: G03G 2221/1654 Locks and means for positioning or alignment
• CPC Class Codes: G03G 2221/1684 using extractable subframes, e.g. on rails or hinges
• CPC Class Codes: G03G 2221/1869 Cartridge holders, e.g. intermediate frames for placing cartridge parts therein

Abstract

An electrophotographic image forming apparatus is usable with a process cartridge having an electrophotographic photosensitive member. The apparatus includes a transfer member contactable to the photosensitive member to transfer a toner image from the photosensitive member thereonto, a tray carrying the cartridge and movable between a contact position where the photosensitive member contacts the transfer member and a spaced position spaced from the transfer member, a supporting member supporting the tray for movement parallel with a tangent line between the photosensitive member and the transfer member between a first position positioning the tray at the contact position and a second position retracted from the first position away from the transfer member in a perpendicular direction perpendicular to the photosensitive-member axial direction and to the tangent line to position the tray at the spaced position, and engageable and engaging portions engageable with each other. The engaging portion regulates tray movement.

Claims

1. An image forming apparatus for forming an image on a recording material, said image forming apparatus comprising:

a main assembly having an engaging portion;

a plurality of photosensitive members on which toner images are to be formed;

an intermediary transfer member that receives toner images from said photosensitive members and carries the toner images to a transfer portion that transfers the toner image onto the recording material;

a drawer member that supports said photosensitive members, said drawer member being drawable outwardly of said main assembly;

a supporting member supporting said drawer member and movable, in a state of supporting the drawer member, from a first position in which said photosensitive members contact said intermediary transfer member to a second position in which said photosensitive members are spaced away from said intermediary transfer member, wherein when said supporting member takes the second position, said drawer member is drawable outwardly of said main assembly in a direction along which said photosensitive members are arranged; and

a portion to be engaged which is provided on said drawer member and which is engaged with said engaging portion to prevent said photosensitive members from moving in the direction relative to said intermediary transfer member when said supporting member takes the first position,

wherein when said supporting member moves from the first position to the second position, said drawer member is moved to space said photosensitive members from said intermediary transfer member without movement in the direction along which said photosensitive members are arranged, and then engagement between said engaging portion is disengaged from said portion to be engaged.

2. An apparatus according to claim 1, wherein said engaging portion includes a projection, and said portion to be engaged includes a recess engageable with said projection.

3. An apparatus according to claim 1, further comprising a frame, wherein said engaging portion is provided on said frame.

4. An apparatus according to claim 1, wherein said engaging portion includes a recess, and said portion to be engaged includes a projection engageable with said recess.

5. An apparatus according to claim 1, wherein said main assembly further includes a frame provided with an opening through which said drawer member is capable of passing, and a door which is movable between a closing position for closing said opening and an opening position in interrelation with said supporting member, wherein when said door takes the closing position, said supporting member takes the first position, and when the door takes the opening position, said supporting member takes the second position.

6. An apparatus according to claim 1, wherein said drawer member removably supports a process cartridge provided with one of said photosensitive members and process means actable on said one of said photosensitive members.

7. An image forming apparatus for forming an image on a recording material, said image forming apparatus comprising:

a main assembly having an engaging portion;

a plurality of photosensitive members on which toner images are to be formed;

a feeding belt that feeds the recording material to transfer the toner images from said photosensitive members directly onto the recording material;

a drawer member that supports said photosensitive members, said drawer member being drawable outwardly of said main assembly;

a supporting member supporting said drawer member and movable, in a state of supporting the drawer member, from a first position in which said photosensitive members contact said feeding belt to a second position in which said photosensitive members are spaced away from said feeding belt, wherein when said supporting member takes the second position, said drawer member is drawable outwardly of said main assembly in a direction along which said photosensitive members are arranged; and

a portion to be engaged which is provided on said drawer member and which is engaged with said engaging portion to prevent said photosensitive members from moving in the direction relative to said feeding belt when said supporting member takes the first position;

wherein when said supporting member moves from the first position to the second position, said drawer member is moved to space said photosensitive members from said feeding belt without movement in the direction along which said photosensitive members are arranged, and then engagement between said engaging portion is disengaged from said portion to be engaged.

8. An apparatus according to claim 7, wherein said engaging portion includes a projection, and said portion to be engaged includes a recess engageable with said projection.

9. An apparatus according to claim 7, further comprising a frame, wherein said engaging portion is provided on said frame.

10. An apparatus according to claim 7, wherein said engaging portion includes a recess, and said portion to be engaged includes a projection engageable with said recess.

11. An apparatus according to claim 7, wherein said main assembly further includes a frame provided with an opening through which said drawer member is capable of passing, and a door which is movable between a closing position for closing said opening and an opening position in interrelation with said supporting member, wherein when said door takes the closing position, said supporting member takes the first position, and when the door takes the opening position, said supporting member takes the second position.

12. An apparatus according to claim 7, wherein said drawer member removably supports a process cartridge provided with one of said photosensitive members and process means actable on said one of said photosensitive members.