Electrostatic copying apparatus capable of copying on both surfa

Details Electrostatic copying apparatus capable of copying on both surfa Electrostatic copying apparatus capable of copying on both surfa

1987-05-14

1989-01-17

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 3SH, 271 31, G03G 1500

Patent

active

047990791

ABSTRACT:
An electrostatic copying apparatus capable of both-surface copying includes a main copying system and a document sending device for conveying a document to be copied through an exposure area. The main copying system includes a copying paper conveying device defining a copying paper conveying passage, an image forming device for forming an image on copying paper conveyed through the paper conveying passage, a copying paper returning device defining a copying paper returning passage for returning copying paper having the image formed on one surface and a paper re-feed device for receiving the copying paper returned through the paper returning passage and feeding it again to the paper conveying passage. According to a first aspect, improvement is made in the paper re-feed device, and according to a second aspect, a document feed device in the document sending device is improved. There is also provided a sheet material feeding device which can be conveniently applied to the paper re-feed device or the document feed device. The sheet material feeding device includes a first feed device for feeding sheet materials in the stacked state from the uppermost one and a second feed device for feeding the sheet materials from the lowermost one.

REFERENCES:
patent: 4413901 (1983-11-01), Kollar
patent: 4462681 (1984-07-01), Aerts et al.
patent: 4466733 (1984-08-01), Pels
patent: 4561765 (1985-12-01), Masuda
patent: 4561772 (1985-12-01), Smith
patent: 4674866 (1987-06-01), Tanaka
patent: 4708462 (1987-11-01), Stemmle

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