发明名称 |
Document feeding apparatus |
摘要 |
A document feeding apparatus feeds a document (18) from the endmost position (22) of a stack of documents (10) into a document path (34) using a vacuum suction head operating through an aperture (36) in a baseplate (16). A vacuum source (38) attracts a document (18) to the suction head (40) during a return stroke (50). No vacuum is applied during a forward stroke (48). The vacuum source (38) comprises a reciprocal air pump (54,108) having a potential energy store (66,90) used to power a rapid vacuum-creating return stroke despite a low-power drive source (44,96) to power the forward stroke. A barrel-pump (54) or bellows device (108) can be used as the reciprocal air pump. The vacuum-creating return stroke can be initiated either by solenoid (78) release or by operation of a cam (98) beyond a first angular position.
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申请公布号 |
US4889332(A) |
申请公布日期 |
1989.12.26 |
申请号 |
US19880189922 |
申请日期 |
1988.05.03 |
申请人 |
UNISYS CORPORATION |
发明人 |
LEONARD, ANTONY J.;MACLEOD, DONALD A. |
分类号 |
B65H3/08;(IPC1-7):B65H3/08 |
主分类号 |
B65H3/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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