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FEEDABILITY SENSOR FOR A VACUUM CORRUGATED FEEDER

IP.com Disclosure Number: IPCOM000025563D
Original Publication Date: 1986-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 72K

Publishing Venue

Xerox Disclosure Journal

Abstract

A system is disclosed for measuring the friction between the bottom two sheets of the stack. The bottom-most sheet IS held to a vacuum corrugation feeder tray 3 by any suitable means such as a vacuum 4 and moves with the tray. The vacuum corrugation feeder tray is mounted on compliant supports 5 and driven near or at its resonant frequency by an electromechanical driver 7. At low or zero air knife pressure, the paper stack 9 is mechanically coupied to the tray and moves with the tray, possibly slipping at some point during the vibration cycle. As the air knife pressure increases, the mechanical coupling decreases, and a point is reached at which the stack remains stationary. Prior to the point where stack motion ceases, the resonance of the tray is modified and i t 1s possible to estimate the weight of the stack. When the stack motion ceases, the frictional force F can be estimated from the driving force required to maintain a given vibrational ampirtude. From the driving force required to maintain a given vibrational amplitude and the mass of the tray or stack, it is possible to calculate the coefficient of friction between the bottom two sheets, The coefficient of friction is then used to control t h e amount of air pressure from the air knife 11 until an optimum coefficient of friction is achieved.

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XEROX DISCLOSURE JOURNAL

FEEDABILITY SENSOR FOR A VACUUM CORRUGATED FEEDER
Raymond W. Huggins

Proposed Classification
U.S. C1. 271/108 Int. Cl. B65h 3/08

A system is disclosed for measuring the friction between the bottom two sheets of the stack. The bottom-most sheet IS held to a vacuum corrugation feeder tray 3 by any suitable means such as a vacuum 4 and moves with the tray. The vacuum corrugation feeder tray is mounted on compliant supports 5 and driven near or at its resonant frequency by an electromechanical driver 7. At low or zero air knife pressure, the paper stack 9 is mechanically coupied to the tray and moves with the tray, possibly slipping at some point during the vibration cycle. As the air knife pressure increases, the mechanical coupling decreases, and a point is reached at which the stack remains stationary. Prior to the point where stack motion ceases, the resonance of the tray is modified and it 1s possible to estimate the weight of the stack. When the stack motion ceases, the frictional force F can be estimated from the driving force required to maintain a given vibrational ampirtude. From the driving force required to maintain a given vibrational amplitude and the mass of the tray or stack, it is possible to calculate the coefficient of friction between the bottom two sheets, The coefficient of friction is then used to control the amount of air pressure from the air knife 11 until an optimum coefficient of friction is achieved.

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