Browse Prior Art Database

Single Sheet Bypass Feed Control

IP.com Disclosure Number: IPCOM000049109D
Original Publication Date: 1982-May-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Clark, WD: AUTHOR

Abstract

Intervention of single sheets onto the top of a stack in a supply cassette is facilitated by a light spring biasing arrangement. The device and method are particularly useful for low-cost duplex operation of a copier.

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Single Sheet Bypass Feed Control

Intervention of single sheets onto the top of a stack in a supply cassette is facilitated by a light spring biasing arrangement. The device and method are particularly useful for low-cost duplex operation of a copier.

Corner bucklers, such as 10, normally provide single-sheet separation from stack 15 in chamber 16 in conjunction with picker rollers (not shown) and means (not shown) for raising stock 15. The picker rollers are moved out of contact with stack 15 except when a sheet is to be moved. Upper bay 18 is an output receptacle. A single leaf spring 20 fastened to roof 21 of chamber 16 of the paper cassette is positioned such that it exerts a very light force on top of the stack. This spring has no effect when normal copying is being done. When a single sheet is to be duplexed, it is simply dropped into the paper cassette. The sheet does not go under the corner bucklers, but is stopped by the spring. If a sheet is so inserted, the next time a copy is made the picker rolls come down on the top sheet, the one trapped by the spring but not in the bucklers. The picker rolls pull the sheet from under the spring and into the paper path.

This device can be used for single letterheads, duplex jobs, and sheets too flimsy to buckle properly in the corner buckler. The slight normal force is enough, when acting in conjunction with the friction of adjacent copy sheets, to prevent single sheets from sliding into the paper path because of th...