Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1989-11-29
1991-05-14
Ip, Paul
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
318135, 355235, G05B 1100, G03G 1528
Patent
active
050159364
ABSTRACT:
A linear driving device is used for example in a copying apparatus. The linear driving device has a first and second linear driving section. The sections can displace a drum projection optical mechanism and an original document scanning optical mechanism from respective initial positions alternately in an original document scanning direction. A driving control section imparts a speed pattern for the drum projection optical mechanism and the original document scanning optical mechanism so that a speed ratio is at 2 to 1. The control section also controls the first and second linear driving sections according to the speed pattern. There is an initial position adjusting section for independently controlling the respective first and second linear driving sections according to external instructions, apart from the control to be effected by the driving control section. The initial position adjustment section compensates for errors caused during assembly or wear in order to keep an optical path constant.
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Ip Paul
Sharp Kabushiki Kaisha
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