Photocopying – Contact printing – Light boxes
Patent
1989-12-11
1992-06-02
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355 67, 355208, 355233, G03G 1528
Patent
active
051191369
ABSTRACT:
A pulse corresponding to the rotation of a motor which moves a scanning system of an original scanning apparatus in a reciprocating motion is counted by a counter each time when the scanning system is operated in the forward and backward movement. By a software control which is performed basing on the counted value, a time period to start braking the scanning system at a practical position in the returning movement is obtained to stop the scanning system at its home position. In order to obtain a desired speed, a duty ratio of a pulse for applying electricity to a motor is controlled from a pulse which corresponds to the rotation of the motor being operated and a pulse width corresponding to the rotation of the motor when it is driven at a desired speed.
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Grimley A. T.
Minolta Camera Kabushiki Kaisha
Smith Matthew S.
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