Image forming apparatus having a mechanism for detecting a...

Details Image forming apparatus having a mechanism for detecting a... Image forming apparatus having a mechanism for detecting a...

2008-08-05

2011-12-06

Gray, David (Department: 2852)

Electrophotography

Image formation

Transfer

C399S049000

Reexamination Certificate

active

08073370

ABSTRACT:
A circumferential length of a belt is measured within a short period of time. A plurality of marks is provided on a belt. Distances between the marks are set to be all different from each other. The distance between the marks is set to allow the mark to be identified by measuring a period of time between the detection of one mark and that of the next mark even if the length of the belt is changed to some degree by the expansion of the belt or the like. Then, a period of time between the identified mark and the next mark is accurately measured. The total circumferential length of the belt is measured based on the results of measurement.

REFERENCES:
patent: 5740492 (1998-04-01), Deki et al.
patent: 6980749 (2005-12-01), Yoda et al.
patent: 2007/0166081 (2007-07-01), Omata et al.
patent: 2001-5527 (2001-01-01), None
patent: 2001-215857 (2001-08-01), None
patent: 2002-244525 (2002-08-01), None
patent: 2005-10701 (2005-01-01), None
patent: 2006-113130 (2006-04-01), None
Machine translation of reference Kokubo (JP 2006-113,130, Listed in IDS) Pub date Apr. 27, 2006.
Machine translation of reference Kurahashi (JP 2001-005,527, Listed in IDS) Pub date Jan. 12, 2001.

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