Browse Prior Art Database

Belt Tracking Servo

IP.com Disclosure Number: IPCOM000090667D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Money, JB: AUTHOR

Abstract

The tracking servo system maintains endless belt 1 positioned close to fixed reference point A with little belt oscillation. Belt 1 is driven about rollers 2 and 3 with roller 3 being pivotable by energization of stepping motor 4 to track belt 1 sideways. The operation of the servo starts when count trigger 5 energizes stepping motor 4 and opens And gate 6 to permit a train of pulses from oscillator 7 to be transmitted to belt position counter 8. When belt 1 reaches point A, it blocks light to phototransistor 9 thus stopping trigger 5 and closing And 6. The number of pulses recorded by counter 8 is compared with the number, read at the previous cycle and recorded on counter 10, in compare circuit 11 for the generation of a negative or positive signal which resets motor 4 for tracking belt 1 closer to point A.

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Belt Tracking Servo

The tracking servo system maintains endless belt 1 positioned close to fixed reference point A with little belt oscillation. Belt 1 is driven about rollers 2 and 3 with roller 3 being pivotable by energization of stepping motor 4 to track belt 1 sideways. The operation of the servo starts when count trigger 5 energizes stepping motor 4 and opens And gate 6 to permit a train of pulses from oscillator 7 to be transmitted to belt position counter 8. When belt 1 reaches point A, it blocks light to phototransistor 9 thus stopping trigger 5 and closing And 6. The number of pulses recorded by counter 8 is compared with the number, read at the previous cycle and recorded on counter 10, in compare circuit 11 for the generation of a negative or positive signal which resets motor 4 for tracking belt 1 closer to point A. Then the cycle is repeated until no motor 4 reset signal results.

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