Electrophotography – Image formation – Development
Reexamination Certificate
2006-07-21
2008-11-11
Gray, David M. (Department: 2852)
Electrophotography
Image formation
Development
C399S228000, C399S231000, C399S234000
Reexamination Certificate
active
07450888
ABSTRACT:
An image forming apparatus and a method of detecting a home position error are provided. The image forming apparatus includes a plurality of developing units, a cam shaft, and a plurality of cams that are formed on the cam shaft to correspond to the respective developing units. A power transmitting element is installed between the plurality of developing units and the plurality of cams and selectively transmits a rotational force of a driving source to the plurality of developing units according to a rotational phase of the cam shaft. An indicating element is installed on the cam shaft and includes a plurality of indicating units. A sensor senses the plurality of indicating units. A home position error is detected each time when the indicating units pass through the sensor.
REFERENCES:
patent: 5579092 (1996-11-01), Isobe
patent: 6763202 (2004-07-01), Maeda
patent: 58-092586 (1983-06-01), None
patent: 05-238071 (1993-09-01), None
patent: 06-015940 (1994-01-01), None
English translation of JP 06-015940.
Chae Su-Kyoung
Jeon Jun-bae
Lee Young-joon
Yang Cheol-ju
Evans Geoffrey T
Gray David M.
Roylance Abrams Berdo & Goodman L.L.P.
Samsung Electronics Co,. Ltd.
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