Electrophotography – Image formation – Transfer
Reexamination Certificate
2005-01-11
2005-01-11
Chen, Sophia S. (Department: 2852)
Electrophotography
Image formation
Transfer
C347S116000, C399S162000, C399S301000, C399S313000
Reexamination Certificate
active
06842602
ABSTRACT:
A device for controlling the drive of an endless movable member of the present invention includes a mark sensor responsive to a plurality of marks continuously positioned on the movable member at preselected intervals in the direction of movement of the movable member. A speed/position controller controls either one of speed and position by using the output of the mark sensor. A discontinuity sensing circuit determines whether or not a discontinuous portion in which a distance between nearby marks does not lie in a preselected range is present in a sensing region assigned to the mark sensor. The speed/position controller varies speed control or position control in accordance with the output of the discontinuity sensing circuit.
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Chen Sophia S.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
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