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Tape Drive Motor Alignment Apparatus

IP.com Disclosure Number: IPCOM000090153D
Original Publication Date: 1969-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Borm, DS: AUTHOR

Abstract

Master tape 10 drawing A, having precisely aligned bits on reference track 11 is used, in conjunction with amplitude divider 12, bridge circuit 14, and voltmeter 16, to accurately align tape 10 with respect to data head 26. This insures machine-to-machine compatibility so that tapes generated on one machine can be read on another machine. Alignment of tape 10 is achieved by physically rotating motors to move tape 10 until a write pulse generated by write pulse generator 22 indicates the placement of magnetic characters on tape 10 the same physical position as the bits of track 11. During the alignment operation, motor shaft 24 turns, driving tape 10, the read section of head 26 senses the bits of track 11 and signals are fed via amplifier 28 to read register 30.

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Tape Drive Motor Alignment Apparatus

Master tape 10 drawing A, having precisely aligned bits on reference track 11 is used, in conjunction with amplitude divider 12, bridge circuit 14, and voltmeter 16, to accurately align tape 10 with respect to data head 26. This insures machine-to-machine compatibility so that tapes generated on one machine can be read on another machine. Alignment of tape 10 is achieved by physically rotating motors to move tape 10 until a write pulse generated by write pulse generator 22 indicates the placement of magnetic characters on tape 10 the same physical position as the bits of track
11. During the alignment operation, motor shaft 24 turns, driving tape 10, the read section of head 26 senses the bits of track 11 and signals are fed via amplifier 28 to read register 30. Write pulses from generator 22, while in read mode, are fed by divider 12 via amplifier 32, which receives no input from tape 10, to read register
34. Thus, register 30 receives its input data from tape 10 while register 34 receives its input data from generator 22. A common reset pulse from reset pulse generator 36 resets registers 30 and 34. As the latter are set by their respective pulses from amplifiers 28 and 32 and reset by pulses from generator 36, bridge 14 develops a potential that is at a minimum when both registers 30 and 34 are set simultaneously. Voltmeter 16, connected to bridge 14 as in B, then indicates a null condition. Motor 18 is physically rotated u...