Return speed control system for use in a document scanning appar

Details Return speed control system for use in a document scanning appar Return speed control system for use in a document scanning appar

1984-07-03

1985-12-10

Prescott, A. C.

Photocopying

Including fiber optics

355 3R, 355 14R, G03G 1500, G03G 1528

Patent

active

045575851

ABSTRACT:
A return speed control system for use in a document scanning apparatus with a moving means moving relative to the document for optical scanning, comprising first and second detecting means and a control means. When the moving means is moving a backward, the first means detects the arrival of the moving means at a first position or an initialize position. When the moving means is in the backward motion, the second detecting means detects the arrival of the moving means at a second position separated by a predetermined distance from, the first position in the scanning direction. According to the operating state of the document scanning apparatus and the results of the detection by the first and second detecting means, the control means selectively sets up a high-speed backward mode, a low-speed backward mode, or a stop mode in the moving means. The predetermined distance which defines the second position is approximately the coasting distance of the moving means due to an inertia of the moving means generated when the operation mode of the moving means is switched from the high-speed backward mode to the low-speed backward mode. In this way, the control means controls the return speed of the moving means to be optimized according to the position of the moving means. Therefore, the return speed control system according to the present invention is free from the damage or distortion by the moving means, while it realizes the quick return of the moving means.

REFERENCES:
patent: 4256399 (1981-03-01), Ikeda
patent: 4324485 (1982-04-01), Asakura et al.
patent: 4371255 (1983-02-01), Satomi
patent: 4383753 (1983-05-01), Inuzuka et al.
patent: 4413900 (1983-11-01), Abe et al.
patent: 4422756 (1983-12-01), Abe et al.
patent: 4484810 (1984-11-01), Spinelli
patent: 4486092 (1984-12-01), Ichinokawa

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