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FRICTION RETARD FEEDER RETRACTING RATCHET

IP.com Disclosure Number: IPCOM000026546D
Original Publication Date: 1992-Oct-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 86K

Publishing Venue

Xerox Disclosure Journal

Abstract

Some friction retard feeders operate by raising and lowering continually rotating feed rolls into contact with copy sheet stacks. In the auxiliary feeder of such machines, lowering the feed head also releases a ratchet mechanism which allows springs below the paper tray to raise the stack to contact a feed roll. The purpose of the ratchet is to interrupt the upward motion of the stack so that it does not follow the feed roll when it rises away from the stack. This mechanism is added to the feeder design in order to avoid stream feeding of sheets. Unfortunately, the ratchet mechanism involves several parts and an unacceptable tolerance management problem, and general operation implies contact with the paper stack without the feed roll coming in contact with the retard pad both while the roll is raised and lowered.

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XEROX DISCLOSURE JOURNAL

FRICTION RETARD FEEDER Proposed Classification RETRACTING RATCHET U.S. C1.217/109
John F. Derrick
C1. Int. Gerald M. Garavuso B65d 39/00

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XEROX DISCLOSURE JOURNAL - Vo1.17 No. 5 September/October 1992 277

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FRICTION RETARD FEEDER RETRACTING RATCHET(C0nt'd)

Some friction retard feeders operate by raising and lowering continually rotating feed rolls into contact with copy sheet stacks. In the auxiliary feeder of such machines, lowering the feed head also releases a ratchet mechanism which allows springs below the paper tray to raise the stack to contact a feed roll. The purpose of the ratchet is to interrupt the upward motion of the stack so that it does not follow the feed roll when it rises away from the stack. This mechanism is added to the feeder design in order to avoid stream feeding of sheets. Unfortunately, the ratchet mechanism involves several parts and an unacceptable tolerance management problem, and general operation implies contact with the paper stack without the feed roll coming in contact with the retard pad both while the roll is raised and lowered.

An improvement over this type of retard feeder is shown in the Figure which includes a mechanism that combines both feed roll engagement of a retard pad and ratchet release. It also ensures that the feed rollhetard pad nip is closed whenever the stack force is applied thereby eliminating a multifeed condit...