Browse Prior Art Database

Original Publication Date: 1980-Dec-31
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal


The separation and feeding of single sheets of heavy weight papers (such as card stock) from a stack of such stock is difficult particularly in a reverse buckle forward feed feeder wherein the feed rolls first rotate in a direction reversed from the direction of feeding to separate adjacent sheets by buckling the top sheet after which the feed rolls are driven in a forward direction. The present device solves that difficulty in taking advantage of an inherent property of the card stock namely, its greater thickness. Since the card stock won't form a reverse buckle loop against the hub of the supply cassette, a simple device added to the rear of the cassette impedes all rearward stock transportation except for the thickness of a single sheet. The device comprises vertical shaft 10 attached to a top plate 12. Another plate 16 is spaced from and on top of the plate 12 by a thickness just slightly more than the thickness of a single sheet of card stock. A linear bearing guide 20 is provided in the bottom of the cassette for supporting the gravity-loaded shaft and plate assembly in the cassette 22. In operation, as a single card stock sheet enters and leaves the slot 18 formed by the two plates, the top plate 12 drops down to the bottom level of the departed sheet. This operation continues until the card stock stack is depleted.