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SELF-ADJUSTABLE FEED NORMAL FORCE

IP.com Disclosure Number: IPCOM000025562D
Original Publication Date: 1986-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 66K

Publishing Venue

Xerox Disclosure Journal

Abstract

A friction retard paper feeder comprises a coacting retard roll 6 and a rotating belt 7 which contacts the top (or bottom) of a stack of sheets 1 in a tray 2. The feed normal force F, applied to the belt is varied automatically depending on the paper size. To this end the tray 2 has side guides 3a, 3b which can be moved apart to accept different paper sizes, one of the gurdes 3a being coupled to means 4 which automatically increase the feed normal force Fn as the guides are moved wider apart. The coupling may be mechanical, hydraulic, pneumatic or electromechanical. For example, the figure shows a mechanical coupling comprising a rack and pinion arrangement with the rack 5 extending from the side guide 3a and the axle 8 of the pinion 9 screwed into a block 10. Thus, as the side guides are moved apart the pinion 9 turns so that by means of the screw thread Fn 1s increased.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

SELF-ADJUSTABLE FEED NORMAL FORCE
David F. Bromage

Proposed Classification
U.S. C1. 271/10 Int. C1. B65h 5/00

A friction retard paper feeder comprises a coacting retard roll 6 and a rotating belt 7 which contacts the top (or bottom) of a stack of sheets 1 in a tray 2. The feed normal force F, applied to the belt is varied automatically depending on the paper size. To this end the tray 2 has side guides 3a, 3b which can be moved apart to accept different paper sizes, one of the gurdes 3a being coupled to means 4 which automatically increase the feed normal force Fn as the guides are moved wider apart. The coupling may be mechanical, hydraulic, pneumatic or electromechanical. For example, the figure shows a mechanical coupling comprising a rack and pinion arrangement with the rack 5 extending from the side guide 3a and the axle 8 of the pinion 9 screwed into a block 10. Thus, as the side guides are moved apart the pinion 9 turns so that by means of the screw thread Fn 1s increased.

Volume 11 Number 2 MarchlApril 1986 59

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JOURNAL DISCLOSURE XEROX 60

Volume 11 Number 2 March/Apnl 1986

[This page contains 1 picture or other non-text object]