Electrostatic copying machine

Details Electrostatic copying machine Electrostatic copying machine

Filed on

1979-12-27

Date issued

1981-07-21

Examiner

Wintercorn, Richard A.

Patent Class

Photocopying

SubClass

Including fiber optics

Other Related Categories

355 11, 355 51, 355 57, 355 71, G03G 1528, G03G 1532, G03B 2734

Type

Patent

Status

active

Patent number

042794978

Description

ABSTRACT:
A variable magnification optical system focusses an image of a portion of an original document on a platen through a variable aperture or slit onto a rotating photoconductive drum. Various members of the optical system or the document are moved at a speed corresponding to the surface speed of the drum to scan the document and form an electrostatic image thereof on the drum. The slit is defined by a fixed aperture plate and a movable aperture plate disposed upstream of the fixed aperture plate in the direction of rotation of the drum. A variable transmission connected between an exposure knob and the movable aperture plate transmits rotation of the knob to the movable aperture plate at a rate corresponding to the magnification. In addition, a side edge of the document is aligned at the same position for all magnifications. The movable aperture plate is formed with a curved edge facing the fixed aperture plate, the center of the curved edge being aligned with the center of the image at all magnifications. As end plate is positioned by a sheet feed mechanism to prevent image formation on a portion of the drum in which the image would not be transferred to an undersized copy sheet.

REFERENCES:
patent: 4017170 (1977-04-01), Komori et al.
patent: 4125323 (1978-11-01), Ikeda et al.
patent: 4139297 (1979-02-01), Hayashi et al.
patent: 4171905 (1979-10-01), Boschet
Xerox Disclosure Journal, "Illumination Slit For A Reproducing Machine", vol. 2, No. 5, Sep./Oct. 1977, Allis, pp. 113-115.

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