Photocopying – Projection printing and copying cameras – Original moves continuously
Patent
1975-12-19
1977-09-20
Griffin, Donald A.
Photocopying
Projection printing and copying cameras
Original moves continuously
G03B 2762
Patent
active
040493482
ABSTRACT:
In photocopying apparatus of the type in which the document to be copied is drawn to pass in front of an elongated exposure window extending transversely to the direction of passage, the window is constituted in a guide and support plate for the sheet to be copied. At least two long openings respectively on both sides of the window and parallel to the latter are each traversed by a front and rear roller respectively for driving the sheet, protruding a short height above the upper surface of the plate and extending in one or several sections, over substantially the whole width of the plate. The drive rollers cooperate by elastic pressure, with a "counterplate" arranged at a slight distance above the plate so as to constitute with it a flattened guide duct for the sheet to be copied, and presenting a smooth and slippery lower surface to the sheet. A finger protruding through a short longitudinal slot in the support plate against elastic pivoting means senses the passage of a sheet to be copied and actuates a microswitch to start the machine operations. The counterplate may be a thin transparent plate forming part of a removable guide and exposure carriage bearing a flexible cover sheet on one edge. This enables a page in a book to be copied.
REFERENCES:
patent: 2959095 (1960-11-01), Magnusson
patent: 3503678 (1970-03-01), Ludwig
patent: 3558224 (1971-01-01), Murgas et al.
patent: 3695754 (1972-10-01), Washio et al.
patent: 3806239 (1974-04-01), Inoue et al.
patent: 3858975 (1975-01-01), Knechtel et al.
Greigg Edwin E.
Griffin Donald A.
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