| 摘要 |
A sheet feeder for feeding sheets from a sheet stack (400), having a feed deck (106) for supporting the sheet stack and a pair of spaced apart parallel guide rails on the feed deck for receiving the sheet stack between the guide rails. A sheet feeding assembly is mounted in proximity to a sheet feeding end of the feed deck and is operative to feed individual lowermost sheets from the sheet stack (400), the sheet feeding assembly including a continuously rotating feed drum (202) having an inner and outer circumference and a plurality of suction openings and a vacuum assembly received in the inner circumference of the feed drum and having at least one rotating cylinder (220) coupled to a vacuum source and movable between an actuated position for drawing air downward through the portion of the feed drum (202) extending above the planar surface of the feed deck (106) and a default position preventing the drawing of air through the feed drum when a vacuum is applied to the at least one rotating cylinder. <IMAGE> |
