Photocopier scanning drive system

Details Photocopier scanning drive system Photocopier scanning drive system

1981-11-30

1984-01-17

Prescott, A. C.

Photocopying

Including fiber optics

355 14R, 355 14C, 355 55, 355 56, G03G 1500

Patent

active

044261497

ABSTRACT:
A photocopier scanning system has a scanning member (which may be the scanning lamp, a scanning mirror, a scanning slit, or a document carrier) on a scanning system powered by a d.c. drive motor synchronized to the rotation of the a.c. main drive motor for the other components of the photocopier. A variable programmer using a phase locked loop control circuit including pulse encoders slaved to the motors maintains strict synchronization between the scanning drive motor and the main drive motor with an appropriate proportionality dependent upon the image magnification/reduction ratio of the photocopier. The optical system may include a movable zoom lens element which gives infinitely variable selection of the magnification/reduction ratio, and which can readily be connected to the programmer to achieve an infinitely variable proportionality between the speeds of the scanning drive motor and the main drive motor to suit any such magnification/reduction ratio. Also the output of the exposure lamp is variable in accordance with the magnification/reduction ratio.

REFERENCES:
patent: 3351831 (1967-11-01), Hemphill et al.
patent: 4080062 (1978-03-01), Torigai et al.
patent: 4126389 (1978-11-01), Ikeda et al.
patent: 4217052 (1980-08-01), Tani et al.

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