Grooved vacuum belt document handling system

B - Operations – Transporting – 65 – H

Patent

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270/162

B65H 5/02 (2006.01) B65H 29/16 (2006.01) G03B 27/64 (2006.01)

Patent

CA 1140954

- 1 - ABSTRACT In a document handling apparatus (10) for moving successive individual document sheets (23) on the imaging surface (37) of a movable vacuum belt (12) (60) into a copier imaging station (24), the vacuum belt (38)(67) has all its vacuum apertures (40)(70) limited to minor areas (38)(67) of the belt underlying the smallest document to be copied to avoid being exposed, but these apertures are pneumatically connected to a pattern of elongated airflow restrictive vacuum grooves (36)(76,77) which grooves extend unapertured under and beyond the document edge over a much greater area of the belt surface than the apertured areas. These grooves provide document vacuum retention in the unaper- tured but grooved belt areas from vacuum apertures which open recessed in selected minor areas of the grooves, and with reduced airflow requirements. The grooves have gently sloped walls (36a) and are otherwise designed to avoid reproducible shadows. The grooves (36) are preferably pneumatically isolated from one another by ungrooved areas, and preferably extend across the belt transverse the direction of belt motion, to provide independent vacuum holding areas for capturing the lead edge areas of the document. Preferably the aperture airflow area in each groove is several times the groove cross-sectional area so that the air pressure drop is along the groove under a document rather than in the apertures. Preferably only defined minor areas ((38)(67, 68, 69) of the belt corresponding to the areas of overlying documents are grooved, which grooved areas are spaced along the belt between ungrooved (39) and the documents are registered over those grooved areas. The vacuum manifold (18) surface (47) underly- ing the belt may also be grooved (48) for improved optical and pneumatic characteristics.

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