Browse Prior Art Database

Tape Steering Device

IP.com Disclosure Number: IPCOM000078605D
Original Publication Date: 1973-Feb-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Jones, DW: AUTHOR [+2]

Abstract

Described is a device that permits closed-loop proportional tape servo positioning by a very low-volume, high-speed pneumatic valving system. The device is a close fitting piston on the inner periphery of the tape air bearing. This piston is made to have very low mass and therefore, suitable to be driven at high velocity. The proximity of the piston to the inner surface of the air bearing, results in a very low volume of air being involved in the control process.

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Tape Steering Device

Described is a device that permits closed-loop proportional tape servo positioning by a very low-volume, high-speed pneumatic valving system. The device is a close fitting piston on the inner periphery of the tape air bearing. This piston is made to have very low mass and therefore, suitable to be driven at high velocity. The proximity of the piston to the inner surface of the air bearing, results in a very low volume of air being involved in the control process.

One embodiment is shown in Fig. 1. A double-conical piston 8 is made to slide in a chamber 5, the outer part of which is perforated to provide an air bearing for tape 6. End caps 4 have holes to admit supply air from 7. Annular spiders 1 are attached to cups 4 and seal support/push rod 3 which guides piston
8. Two supports are used so as to provide balanced forces on 8. Push rod 3 is attached to motive means 2 and is thus made to slide back and forth, in accordance with the drive to the motive means. As the piston moves nearer to one side than the other, air flow decreases on the side where the piston is closest to the seat 9, thus unbalancing the air flow thru the bearing parts and, in turn, causing tape 6 to move along the air bearing surface due to the pressure gradient established. An additional gradient is established by the exposure of more perforations on the side opposite of the piston travel direction. The piston is made to fit closely in the middle so as to form two discret...