System for controlling the reciprocation of a scanning apparatus

Details System for controlling the reciprocation of a scanning apparatus System for controlling the reciprocation of a scanning apparatus

1983-08-09

1985-12-31

Shoop, Jr., William M.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3R, 355 14C, 355 8, 318626, 318468, G03G 1500

Patent

active

045617716

ABSTRACT:
A system for controlling the reciprocation of a scanning apparatus which includes a scanning device for scanning an original from a home position across the original to a scanned position and returning it from the scanned position back to the home position, a D.C. motor for driving the scanning device, and a switching circuit for providing electric power to the D.C. motor. The system further includes a home switch for detecting when the scanning device is in the home position, a counter for counting a distance of movement of the scanning device, and a speed detector for detecting the speed of the scanning device. A control device is coupled to the switching circuit for controlling the movement of the scanning device such that during the return of the scanning apparatus, a braking action is initiated when the scanning device returns to a preselected position, and the braking lasts until the returning speed is reduced to a predetermined low speed as detected by the speed detecting device. Then, the scanning device is returned at the low constant speed until a home position detecting device detects that the scanning device is in the home position. The counter device counts the distance of movement of the scanning device at the low constant speed, and the counted distance is used for calculating a preselected position for the next cycle of scan so that the distance in the next cycle of scan is controlled to be substantially equal to a predetermined distance.

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