Browse Prior Art Database

DOUBLE DUTY SENSOR FOR PAPER TRAY ELEVATORS

IP.com Disclosure Number: IPCOM000025247D
Original Publication Date: 1984-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 79K

Publishing Venue

Xerox Disclosure Journal

Abstract

Paddle wheel feeders that require an elevator to maintain paper stack height have a serious drawback. If any mechanical means is used to detect the top of the paper stack, feeding may be impaired or stopped due to the low drive force of the paddle wheel feeder. It is necessary to use an optical sensor to detect the top of the stack. Penetration can be maintained and no drag forces are added to the load of the paddle wheel. The disadvantage of the optical sensor is that if the associated electronics malfunctions, the paper stack may not be recognized by the optical sensor. The elevator would then continue to move the paper stack upward into the optical sensor first and then into the frame and other stationary parts of the feeder. Damage will .probably occur to the optical sensor, elevator parts and feeder parts.

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XEROX DISCLOSURE JOURNAL

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DOUBLE DUTY SENSOR FOR PAPER TRAY ELEVATORS U.S. C1. 271/152 Russell J. Sokac

Proposed Classification

Int. C1. B65h 1/18

-25

Paddle wheel feeders that require an elevator to maintain paper stack height have a serious drawback. If any mechanical means is used to detect the top of the paper stack, feeding may be impaired or stopped due to the low drive force of the paddle wheel feeder. It is necessary to use an optical sensor to detect the top of the stack. Penetration can be maintained and no drag forces are added to the load of the paddle wheel. The disadvantage of the optical sensor is that if the associated electronics malfunctions, the paper stack may not be recognized by the optical sensor. The elevator would then continue to move the paper stack upward into the optical sensor first and then into the frame and other stationary parts of the feeder. Damage will .probably occur to the optical sensor, elevator parts and feeder parts.

Volume 9 Number 2 March/April 1984 111

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DOUBLE DUTY SEN SO^ FOR PAPER TRAY ELEVATORS (Cont'd)

To overcome this problem, a mechanical sensor is placed in such a position that if the optical system does not function, the elevator will continue to move the paper stack up into the optical sensor. After a small amount of travel, the mechanical sensor is triggered to stop the elevator before more damage can be done. After the mechanical sensor is...