Apparatus for producing simplex of duplex copies

Details Apparatus for producing simplex of duplex copies Apparatus for producing simplex of duplex copies

1978-07-03

1980-03-04

Braun, Fred L.

Photocopying

Including fiber optics

271 9, 271186, 355 24, 355 26, G03G 1500

Patent

active

041914651

ABSTRACT:
Apparatus operable in duplex and simplex modes for making copies having images on one or both sides thereof. In the duplex mode, first and second transferable images are formed on a movable image transfer member by an image forming device, a copy sheet is supplied from a copy sheet supply into transfer relationship with the transfer member and the first image is transferred to a first side of a copy sheet at a first image transfer station. A vacuum drum located adjacent to the transfer member is rotated in a first direction to separate the copy sheet from the transfer member. After the copy sheet has been separated, the drum is rotated in a second opposite direction to invert the copy sheet while the first image is unfixed and to register the second side with the second transferable image on the transfer member at a second image transfer station. In the simplex mode, a first image is formed on the transfer member by the image forming device, a copy sheet is supplied from the supply into contact with the vacuum drum and the drum is rotated in the second direction to assist in registering the first side of the copy sheet with the first image on the transfer member at the second transfer station. Preferably an image fixing device is provided to fix the duplex or simplex images to the copy sheet. A control may also be provided to coordinate the operation of the apparatus in the simplex or duplex modes.

REFERENCES:
patent: 3687539 (1972-08-01), Furuichi
patent: 3833911 (1974-09-01), Caldwell et al.
patent: 4095979 (1978-06-01), DiFrancesco et al.

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