Burroughs, Inc.

Nitin M Sevak

Chauchang Su

A high speed sheet stacking device for stacking documents on edge as they are serially ejected from a sheet transport apparatus into preselected sorting pockets. A pair of spaced-apart paddle wheels coaxially disposed subjacent to the pocket are rotatively driven through apertures formed therein, displacing the documents to the back side of the pocket in a serially stacked arrangement. The paddles remain outside of the pocket until advanced in rotative steps of 90.degree. responsive to the passing of a document past a predetermined point enroute to the stacking pocket. A thin wire spring secured to the outer end of each paddle aids in displacing the documents during stacking and remains bent through the pocket floor in holding contact against the stacked sheets after the rotative stepping is completed.

Document stacking device

Document transport apparatus in a document reader sorter is provided with a vacuum assisted friction feeder for picking documents one at a time from a document hopper and for advancing the documents at high speed along a document transport guideway to the control of a transport burst roller, the picking of the documents from the hopper by an apertured friction feed belt being assisted and facilitated by a low pressure vacuum directed upon a linearly disposed section thereof adjacent the hopper, and the high speed advancement of the documents into and along the document guideway to the control of the transport burst roller being assisted and facilitated by a high pressure vacuum directed upon a curvilinear section of the apertured belt cooperably disposed relative to the apertured circumference of a drive pulley, said high pressure vacuum being effective to lock the picked documents and particularly the leading edges thereof to the feed belt for an accelerated feeding thereof, said accelerated feeding of the documents into the document transport guideway in combination with the accelerated transmission of the documents therein by the transport burst roller resulting in maximized document throughput for the document reader sorter.

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Westland, MI, United States of America

Nitin M Sevak