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FLUID AMPLIFIER SERVO BELT TRACKING SYSTEM

IP.com Disclosure Number: IPCOM000024389D
Original Publication Date: 1980-Jun-30
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 64K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electrophotographic printing machine, a photoconductive belt is frequently supported by a plurality of posts or rollers 12, 14 and 16. As the belt is advanced in the direction of arrow 18, it may laterally deviate from the desired path of movement. The lateral movement must be corrected to insure that the belt passes through the various processing stations disposed thereabout at the proper point. This is achieved by a belt tracking and correcting system indicated generally by the reference numeral 20. The belt tracking and correction system is coupled to steering roller 16. This system includes a sensor 22 wherein an air jet passes from one opening to another opening with the belt being capable of being interposed therebetween. When the belt moves laterally, it blocks the flow of air. This blocked flow of air is detected and a fluid amplifier 24 coupled to a pressure supply directs a pressurized air flow to either bellows 26 or bellows 28. Bellows 26 and bellows 25 are arranged to pivot steering roller 16 in opposite directions. The pivoting movement of steering roller 16 in either direction tends to correct for the lateral movement of belt 10. In this way, belt 10 is constrained to move in the desired path.

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XEROX DISCLOSURE JOURNAL

FLUID AMPLIFIER SERVO BELT TRACKING SYSTEM

~ Ralph A. Hamaker

Proposed Classification
U.S. Cl. 430/31 Int. Cl. G03g 13/00

P. s.

In an electrophotographic printing machine, a photoconductive belt is frequently supported by a plurality of posts or rollers 12, 14 and 16. As the belt is advanced in the direction of arrow 18, it may laterally deviate from the desired path of movement. The lateral movement must be corrected to insure that the belt passes through the various processing stations disposed thereabout at the proper point. This is achieved by a belt tracking and correcting system indicated generally by the reference numeral 20. The belt tracking and correction system is coupled to steering roller 16. This system includes a sensor 22 wherein an air jet passes from one opening to another opening with the belt being capable of being interposed therebetween. When the belt moves laterally, it blocks the flow of air. This blocked flow of air is detected and a fluid amplifier 24 coupled to a pressure supply directs a pressurized air flow to either bellows 26 or bellows 28. Bellows 26 and bellows 25 are arranged to pivot steering roller 16 in opposite directions. The pivoting movement of steering roller 16 in either direction tends to correct for the lateral movement of belt 10. In this way, belt 10 is constrained to move in the desired path.

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Volume 5 Number 3 May/June 1980 321

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