Plural belt document feeder

Details Plural belt document feeder Plural belt document feeder

B - Operations, Transporting

65

H

270/162

B65H 9/06 (2006.01) B65H 5/02 (2006.01) B65H 5/22 (2006.01) G03G 15/00 (2006.01)

Patent

CA 1327820

ABSTRACT An automatic or semi-automatic document feeder (12) for conveying documents sheets (17) into and away from an imaging position (18) on a platen (14) of a copier, incorporating a plurality of spaced-apart belts (30) moving between a white backing surface (261 and the platen. A vacuum source applies a partial vacuum to the inter-belt gaps (32) to hold a document sheet against the belts so that the document is conveyed with the movement of the belts. A major portion of the backing surface (26) lies in a datum plane. Discrete protrusions (56) which extend above the datum plane are formed integrally on the backing surface in pairs of rows, against which the belts ride to hold the belts in spaced relation to the datum plane. The spaces (57) between the protrusions provide openings so that a partial vacuum applied beneath the belts may extend into the inter-belt gaps. "Show- through" and "show-around" printing defects are thus substantially reduced because the backing surface can be entirely flat between the belts and the belts themselves require no apertures. Channels may be provided beneath the belts in the longitudinal direction thereof to ensure the application of uniform partial vacuum over the whole platen area.

588085

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