Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorKoichi Taniguchi
Life of this patent
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Abstract
An image forming apparatus employs a constitution in which, in a case that a relative position between an inner roller and an outer member with respect to a circumferential direction of the inner roller is changed in a period after a preceding recording material passes through a transfer portion and until a recording material subsequent to the preceding recording material reaches the transfer portion during execution of a job for forming and outputting images on a plurality of recording materials, a controller controls a position changing mechanism and a contact and separation mechanism so that a separating operation for separating the outer roller from a belt is performed and then the above described relative position is changed.
Claims6
1-6. (canceled)
An image forming apparatus comprising:
- an image bearing member configured to bear a toner image;
- a transfer unit configured to form a transfer nip between the image bearing member and the transfer unit for transferring the toner image;
- a position changing mechanism configured to change a position of the transfer nip with respect to a rotational direction of the image bearing member;
- and
- a controller configured to control the position changing mechanism,
- wherein in a case that an operation, in which the position of the transfer nip with respect to the rotational direction of the image bearing member is changed in a period after a trailing edge of a first image area reaches the transfer nip and before a leading edge of a second image area subsequent to the first image area reaches the transfer nip during execution of a continuous image forming job for forming and outputting images on a plurality of recording materials, is executed,
- in the period, the controller:
- (i) controls the position changing mechanism to change the position of the transfer nip with respect to the rotational direction of the image bearing member, and then
- (ii) controls an image forming operation so that formation of a latent image for the second image area is started after change of the position of the transfer nip is completed.
Dependencies are inferred from the claim text.