Browse Prior Art Database

Feeding Perforated Tape

IP.com Disclosure Number: IPCOM000098698D
Original Publication Date: 1959-Oct-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Streeter, DN: AUTHOR

Abstract

In some machines for feeding magnetic tape at high speeds, rotatable capstans are utilized.

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Feeding Perforated Tape

In some machines for feeding magnetic tape at high speeds, rotatable capstans are utilized.

Each capstan may be constructed of a rotatable perforated capstan sleeve mounted over a stationary spindle. An internal hollow portion of the spindle may be connected to either pressure means or vacuum means. The spindle has a 45 degree pocket located at a portion over which the magnetic tape is moved. The application of vacuum causes a sucking effect over the pocket to draw the tape up against the rotatable capstan sleeve to drive the tape. Application of air pressure to the capstan sleeve, held stationary, causes it to act as an air bearing.

Such machines may be adapted for use with perforated tape by providing a thin, auxiliary unperforated belt placed on the opposite side of the tape from the capstan. This belt is rotatable about a pair of air bearings so as to provide very little pressure against the tape. The belt is attracted by the vacuum from the drive capstan which is communicated through the sleeve perforations to seal the potential leakage paths. The perforated tape is thus driven on a machine built for magnetic tapes at high speeds.

Similarly, another thin auxiliary belt may be placed near the other capstan so that the perforated tape is blown against the belt, which then seals the potential leakage paths of the bearing capstan, providing an operative air bearing.

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