Patent Number: 7,133,627

Title: Belt driver, image forming apparatus, and method that can reduce the time until speed control of a belt is performed

Abstract: A belt driver includes a belt having a constant number of regions dividing the belt in the perimeter direction thereof. A plurality of marks have different widths in the perimeter direction and are formed in the respective regions of the belt. A sensor detects the marks on the belt. A storage part stores in advance the relationship between position information of the belt and speed variation of the belt for one rotation of the belt. Speed variation of the belt is reduced by correcting the drive speed of the belt based on the relationship. The position of the belt is detected from a time required for one of the marks to pass the sensor, and speed correction control of the belt is performed in accordance with the detected position.

Inventors: Nishizaki; Shingo (Kanagawa, JP)

Assignee: Ricoh Company, Ltd.

International Classification: G03G 15/00 (20060101); G03G 15/16 (20060101)

Expiration Date: 2019-11-07 0:00:00