Image forming apparatus having casing for maintaining relative positions of photosensitive drums
First Claim
1. An image forming apparatus comprising:
- a casing including a first frame, a second frame, and a third frame of resin, the third frame being configured to support the first frame;
a plurality of photosensitive drums configured to rotate about an axis line extending in an axial direction and juxtaposed at intervals in the casing, the casing defining one side and the other side in the axial direction, drive force for rotating the plurality of photosensitive drums being inputted to the one side of the plurality of photosensitive drums;
a plurality of developing devices provided to correspond to the plurality of photosensitive drums and configured to supply developing agent to the corresponding photosensitive drums; and
a support plate supporting a drive source configured to generate the drive force and a rotational member configured to transmit the drive force from the drive source to the one side of the plurality of photosensitive drums, the support plate being made of metal and supported on the third frame,wherein the first frame is made of metal and is configured to support the one side of each of the plurality of photosensitive drums, and the second frame is made of resin and is configured to support the other side of each of the plurality of photosensitive drums,wherein when projected in the axial direction, the first frame has a first projected surface and the third frame has a second projected surface in the axial direction, the first projected surface falling within the second projected surface as viewed in the axial direction.
1 Assignment
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Accused Products
Abstract
An image forming apparatus includes a casing, a plurality of photosensitive drums, and a plurality of developing device. The casing includes a first frame and a second frame. The plurality of photosensitive drums is configured to rotate about an axis line extending in an axial direction and juxtaposed at intervals in the casing. The casing defines one side and the other side in the axial direction. Drive force for rotating the plurality of photosensitive drums is inputted to the one side of the plurality of photosensitive drums. The plurality of developing device is provided to correspond to the plurality of photosensitive drums and configured to supply developing agent to the corresponding photosensitive drum. The first frame is made of metal and is configured to support the one side of each of the plurality of photosensitive drums, and the second frame is made of resin and is configured to support the other side of each of the plurality of photosensitive drums.
56 Citations
15 Claims
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1. An image forming apparatus comprising:
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a casing including a first frame, a second frame, and a third frame of resin, the third frame being configured to support the first frame; a plurality of photosensitive drums configured to rotate about an axis line extending in an axial direction and juxtaposed at intervals in the casing, the casing defining one side and the other side in the axial direction, drive force for rotating the plurality of photosensitive drums being inputted to the one side of the plurality of photosensitive drums; a plurality of developing devices provided to correspond to the plurality of photosensitive drums and configured to supply developing agent to the corresponding photosensitive drums; and a support plate supporting a drive source configured to generate the drive force and a rotational member configured to transmit the drive force from the drive source to the one side of the plurality of photosensitive drums, the support plate being made of metal and supported on the third frame, wherein the first frame is made of metal and is configured to support the one side of each of the plurality of photosensitive drums, and the second frame is made of resin and is configured to support the other side of each of the plurality of photosensitive drums, wherein when projected in the axial direction, the first frame has a first projected surface and the third frame has a second projected surface in the axial direction, the first projected surface falling within the second projected surface as viewed in the axial direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An image forming apparatus comprising:
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a casing including a first frame, a second frame, and a third frame of resin, the third frame being configured to support the first frame; a plurality of photosensitive drums configured to rotate about an axis line extending in an axial direction and juxtaposed at intervals in the casing, the casing defining one side and the other side in the axial direction, drive force for rotating the plurality of photosensitive drums being inputted to the one side of the plurality of photosensitive drums; a plurality of developing devices provided to correspond to the plurality of photosensitive drums and configured to supply developing agent to the corresponding photosensitive drums; and an exposing unit provided to correspond to the plurality of photosensitive drums and configured to expose the photosensitive drum, wherein the first frame is made of metal and is configured to support the one side of each of the plurality of photosensitive drums, and the second frame is made of resin and is configured to support the other side of each of the plurality of photosensitive drums, wherein when projected in the axial direction, the first frame has a first projected surface and the third frame has a second projected surface in the axial direction, the first projected surface falling within the second projected surface as viewed in the axial direction, and wherein the first frame includes a first exposure positioning member configured to fix a position of the one side of the exposing unit in an arrangement direction of the plurality of photosensitive drums. - View Dependent Claims (13)
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14. An image forming apparatus comprising:
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a casing including a first frame, a second frame, and a third frame of resin, the third frame being configured to support the first frame; a plurality of photosensitive drums configured to rotate about an axis line extending in an axial direction and juxtaposed at intervals in the casing, the casing defining one side and the other side in the axial direction, drive force for rotating the plurality of photosensitive drums being inputted to the one side of the plurality of photosensitive drums; a plurality of developing devices provided to correspond to the plurality of photosensitive drums and configured to supply developing agent to the corresponding photosensitive drums; and a feeding unit configured to feed a sheet to the photosensitive drum, wherein the first frame is made of metal and is configured to support the one side of each of the plurality of photosensitive drums, and the second frame is made of resin and is configured to support the other side of each of the plurality of photosensitive drums wherein when projected in the axial direction, the first frame has a first projected surface and the third frame has a second projected surface in the axial direction, the first projected surface falling within the second projected surface as viewed in the axial direction, and wherein the first frame is provided with a first supply positioning part configured to fix a position of the one side of the feeding unit in an arrangement direction of the plurality of photosensitive drums, wherein the second frame is provided with a second supply positioning part configured to fix a position of the other side of the feeding unit in the arrangement direction.
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15. An image forming apparatus comprising:
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a casing including a first frame, a second frame, and a third frame of resin, the third frame being configured to support the first frame; a plurality of photosensitive drums configured to rotate about an axis line extending in an axial direction and juxtaposed at intervals in the casing, the casing defining one side and the other side in the axial direction, drive force for rotating the plurality of photosensitive drums being inputted to the one side of the plurality of photosensitive drums; a plurality of developing devices provided to correspond to the plurality of photosensitive drums and configured to supply developing agent to the corresponding photosensitive drums; and a fixing unit configured to fix a developing agent image on a sheet, wherein the first frame is made of metal and is configured to support the one side of each of the plurality of photosensitive drums, and the second frame is made of resin and is configured to support the other side of each of the plurality of photosensitive drums, wherein when projected in the axial direction, the first frame has a first projected surface and the third frame has a second projected surface in the axial direction, the first projected surface falling within the second projected surface as viewed in the axial direction, wherein the first frame is provided with a first fixing unit positioning part configured to fix a position of the one side of the fix unit in an arrangement direction of the plurality of photosensitive drums, and wherein the second frame is provided with a second fixing unit positioning part configured to fix a position of the other side of the fixing unit in the arrangement direction.
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Specification