Document platen driving device

Details Document platen driving device Document platen driving device

1993-01-21

1993-11-30

Moses, R. L.

Photocopying

Contact printing

Light boxes

74 30, G03G 1500

Patent

active

052670023

ABSTRACT:
A document platen driving device is provided with an endless gear connected to a document platen, whereon a document is placed, which reciprocates. A sun gear is secured to a fixed station within a space surrounded by the endless rack, and a planetary gear meshing with the endless rack and with the sun gear is also provided within the space. The planetary gear is a double gear composed of a large gear and a small gear having different pitch circle diameters. It is arranged such that the document platen is moved forward by meshing the small gear with the endless rack, and moved backward by meshing the large gear with the endless rack. In this arrangement, the backward moving speed of the document platen can be set faster than the forward moving speed, thereby permitting a reduction of the entire time required for a copying process, especially for a successive copying process.

REFERENCES:
patent: 2821861 (1958-02-01), Dunn
patent: 4112840 (1978-09-01), Englund
patent: 4172653 (1979-10-01), Bujese
patent: 4294554 (1981-10-01), Mattsson
patent: 4319835 (1982-03-01), Navone
patent: 4530591 (1985-07-01), Mastuyama
patent: 5113225 (1992-05-01), Deguchi

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