Image forming apparatus with intermediate transfer belt...

Details Image forming apparatus with intermediate transfer belt... Image forming apparatus with intermediate transfer belt...

2008-07-30

2011-11-22

Chen, Sophia S (Department: 2852)

Electrophotography

Image formation

Transfer

C399S066000

Reexamination Certificate

active

08064809

ABSTRACT:
An image forming apparatus includes an endless belt type transfer member configured to carry an image formed with developer of a plurality of colors, a drive roller configured to drive the transfer member by rotating while contacting the transfer member, a first detection unit configured to detect a mark provided on the transfer member, a second detection unit configured to detect the mark at a position different from the position of the first detection unit in a conveyance direction of the transfer member, and a correction unit configured to correct a conveyance speed of the transfer member using a difference between respective times at which the first and second detection units detect the mark. The first and second detection units are located such that an interval between respective positions at which the first and second detection units detect the mark is an integral multiple of a perimeter of the drive roller.

REFERENCES:
patent: 5875380 (1999-02-01), Iwata et al.
patent: 7221894 (2007-05-01), Kishi
patent: 2005/0053388 (2005-03-01), Yokoyama et al.
patent: 2005/0214037 (2005-09-01), Kishi
patent: 2007/0231022 (2007-10-01), Yokoyama et al.
patent: 09-175687 (1997-07-01), None
patent: 2005-156877 (2005-06-01), None
patent: 2005-156877 (2005-06-01), None
Machine translation of JP 2005-156877 dated Jun. 6, 2011.

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