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Tape or Film Column Sensing and Control

IP.com Disclosure Number: IPCOM000096259D
Original Publication Date: 1963-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Thompson, LJ: AUTHOR

Abstract

A tape transport mechanism employed to control a single loop in a tape 1, utilizes thermistors 3, 5 and 7 positioned in ports within the vacuum column 9, which, in turn, is connected to a vacuum source. The system has drives 11 and 13 which include a drive capstan, a stop capstan and idlers. When the tape is pulled by drive 11 in the indicated direction, the movement of the tape and the resulting air flow past thermistor 5 produces a change in heat radiated from thermistor 5. Such, when sensed by thermistor 5 actuates an output control circuit, not shown, to activate the drive 13 to replenish the tape.

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Tape or Film Column Sensing and Control

A tape transport mechanism employed to control a single loop in a tape 1, utilizes thermistors 3, 5 and 7 positioned in ports within the vacuum column 9, which, in turn, is connected to a vacuum source. The system has drives 11 and 13 which include a drive capstan, a stop capstan and idlers. When the tape is pulled by drive 11 in the indicated direction, the movement of the tape and the resulting air flow past thermistor 5 produces a change in heat radiated from thermistor 5. Such, when sensed by thermistor 5 actuates an output control circuit, not shown, to activate the drive 13 to replenish the tape.

In replenishing the tape, the movement of the tape is such that the tape loop lengthens until thermistor 7 senses a change in air flow (tape position). Movement of the tape beyond the normal upper or lower limits is sensed by the associated thermistor 3 or 7 to actuate the stop capstan associated with drive 11 or 13, respectively. This sensing method means is particularly advantageous in an environment having a low differential pressure or in a film drive where light sensing or mechanical handling movement of the light sensitive film is not permissible.

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