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US 11,768,456 B2Granted
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsShinsuke Kobayashi, Ai Suzuki, Kensuke Umeda, Kazuhiro Funatani
Life of this patent
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Abstract
An image forming apparatus controls the number of rotations of a photosensitive drum based on information related to the use of the photosensitive drum and a suspension time in a rotation operation of rotating the photosensitive drum after a lapse of the suspension time between a first image forming operation of forming an image on a transfer material and a second image forming operation performed after the first image forming operation.
Claims30
An image forming apparatus comprising:
- a rotary photosensitive drum;
- a charging member configured to charge a surface of the photosensitive drum at a charging portion;
- a development unit configured to supply toner onto the surface of the photosensitive drum charged by the charging member and to form a toner image on the photosensitive drum;
- a transfer member configured to be in contact with the photosensitive drum to form a transfer portion and transfer the toner image formed on the photosensitive drum to a transfer material at the transfer portion;
- a brush member in contact with the surface of the photosensitive drum at a position downstream of the transfer portion and upstream of the charging portion in a rotation direction of the photosensitive drum;
- a driving unit configured to rotate the photosensitive drum;
- a storage unit configured to store information related to the use of the photosensitive drum;
- and
- a control unit configured to control the driving unit,
- wherein the control unit controls a first image forming operation of forming an image on the transfer material and a second image forming operation performed after the first image forming operation passes and a rotation operation of rotating the photosensitive drum so that the rotation operation is performed before the second image forming operation is performed, and
- wherein the control unit controls a number of rotations of the photosensitive drum in the rotation operation based on the information and a suspension time from the end of the execution of the first image forming operation to the start of the rotation operation.
8 more elements
An image forming apparatus comprising:
- an image bearing member configured to be rotated and driven;
- a charging member configured to charge a surface of the image bearing member at a charging portion;
- a development unit configured to supply toner to an electrostatic latent image formed on the surface of the image bearing member charged by the charging member and form a toner image;
- a transfer member configured to form a transfer portion for holding a recording material between the transfer member and the image bearing member and transfer the toner image from the image bearing member to the recording material at the transfer portion;
- and
- a brush member including a base cloth and a plurality of fiber yarns woven in the base cloth, the plurality of fiber yarns having tail edges extending from the base cloth and being in contact with the surface of the image bearing member at a position downstream of the transfer portion and upstream of the charging portion in a rotation direction of the image bearing member,
- wherein a water absorption amount per unit area of the brush member in a case where a 1-mm region from the tail edges of the plurality of fiber yarns, which are to be brought into contact with the image bearing member, is immersed in 20° C. water for 10 seconds is 2.2 mg/mm2 or greater.
4 more elements
Dependencies are inferred from the claim text.