Browse Prior Art Database

PARALLELOGRAM FEED HEAD SUSPENSION

IP.com Disclosure Number: IPCOM000025129D
Original Publication Date: 1983-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 72K

Publishing Venue

Xerox Disclosure Journal

Abstract

Variable dynamic stack force friction feeder designs (especially in pivoted feed head devices) can cause ,problems, such as, increased misfeed or multifeed rates and excessive lightweight sheet damage. Uncontrolled stack force, therefore, decreases the generic latitude of such devices.

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KEROX DISCLOSURE JOURNAL

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PARALLELOGRAM FEED HEAD SUSPENSION
Robert P. Rebres

Proposed Classification
U.S. CI. 271/34 Int. Cl. B65h 3/04

Variable dynamic stack force friction feeder designs (especially in pivoted feed head devices) can cause ,problems, such as, increased misfeed or multifeed rates and excessive lightweight sheet damage. Uncontrolled stack force, therefore, decreases the generic latitude of such devices.

Greater control of the dynamic stack force of a friction feed head can be accomplished as shown in the figure by the use of a parallelogram suspension system instead of a simple feed head pivot. The suspension shown in the figure allows application of the necessary drive torques without causing variation of the dynamic stack normal force. In the feed system 10, the stack force is independent of sheet-to-sheet friction level, feed belt tension, stack to the pivot dimensions, drive ratios employed and feed head mass during the sheet feed cycle. This is due to the fact that the feed head cannot react to the applied drive torque since it is stablized against rotation by the action of the parallelogram linkage. When the drive torque is applied to the feed head it is introduced at point C by a difference in the tension in belt 20. This tension difference appears at point C as torque T

Volume 8 Number 5 Septernber/October 1983 397

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PARALLELOGRAM FEED HEAD SUSPENSION (Cont'd)

and a compre...