Patent ID: 11945677
Assignee: RICOH COMPANY, LTD.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. An image forming apparatus, comprising:
a sheet conveyance device including a sheet conveyance roller and a pressure roller configured to hold and convey a sheet between the sheet conveyance roller and the pressure roller;
an image forming device configured to form an image on the sheet conveyed by the sheet conveyance device;
a memory configured to store profile data for each of a plurality of positions in an axial direction of the sheet conveyance roller, the profile data indicating a variation in conveyance amount in a circumferential direction due to eccentricity of the sheet conveyance roller; and
a controller configured to control the sheet conveyance device and the image forming device,
wherein the controller is configured to repeatedly execute intermittent conveyance processing and image forming processing,
the intermittent conveyance processing including rotating the sheet conveyance roller to cause the sheet conveyance device to convey the sheet by a predetermined conveyance amount; and
the image forming processing including causing the image forming device to form an image on an area of the sheet having been conveyed to a position facing the image forming device by the intermittent conveyance processing, and

wherein the controller is configured to:
calculate, in the intermittent conveyance processing, a correction value based on corresponding profile data for each of a plurality of positions included in a width of an image to be formed on the sheet in next image forming processing, the correction value being a difference between the predetermined conveyance amount and an actual conveyance amount;
correct a reference amount of rotation by a representative value of a plurality of calculated correction values to calculate a corrected amount of rotation, the reference amount of rotation being an ideal amount of rotation of the sheet conveyance roller that conveys the sheet by the predetermined conveyance amount; and
rotate the sheet conveyance roller by the corrected amount of rotation calculated.