Plural level vacuum document feeder

Details Plural level vacuum document feeder Plural level vacuum document feeder

1985-10-17

1986-05-20

Schacher, Richard A.

Sheet feeding or delivering

Feeding

With means to align sheet

271227, 271276, 355 14SH, B65H 906

Patent

active

045896526

ABSTRACT:
In a document feeder with a vacuum belt platen transport system for transporting document sheets over the platen of a copier under a white vacuum plenum backing surface closely overlying the platen and into a registration position for imaging the document sheet, with a registration system for stopping the document sheet at the registration position, the platen transport system including a vacuum source for applying a partial vacuum to a document sheet being transported sufficient to provide transport of the document sheet with movement of the belt transport into the registration system, and a system for automatically reducing the level of the partial vacuum in the vacuum plenum sufficiently to allow slippage of a document sheet relative to the belt transport at the registration system and to avoid damage to the document sheet by the registration system; the improvement comprising a system for prior detection of a document sheet of greater than a predetermined size to be registered by the registration system. The vacuum belt platen transport system preferably comprises plural unapertured spaced-apart moving belts between which the partial vacuum is applied, wherein the partial vacuum level is automatically reduced to less than approximately 8 millimeters of water in response to the system for prior detection of a document sheet of greater than a predetermined size, and wherein the belts continue to move after the document sheet is stopped at the registration position by the registration system with slippage between the belts and the document sheet, and wherein the partial vacuum level is so automatically reduced after the partial transporting of the document sheet over the platen of the copier but prior to the transporting of a document sheet of greater than the predetermined size into the registration system.

REFERENCES:
patent: 4135808 (1979-01-01), Morrison
patent: 4291974 (1981-09-01), Silverberg

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