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Tape Drive Capstan

IP.com Disclosure Number: IPCOM000079367D
Original Publication Date: 1973-Jun-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Arey, DE: AUTHOR [+4]

Abstract

This tape drive capstan is constructed with a tapered wall thickness to increase the capstan's bending and torsional stiffness, without appreciably adding to the capstan's inertia. The capstan, and its printed-circuit motor armature, are intended for use with a high-torque - low-inertia capstan motor such as shown in Volume 14, Number 6, (November 1971), of the IBM Technical Disclosure Bulletin, at pages 1750-51.

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Tape Drive Capstan

This tape drive capstan is constructed with a tapered wall thickness to increase the capstan's bending and torsional stiffness, without appreciably adding to the capstan's inertia. The capstan, and its printed-circuit motor armature, are intended for use with a high-torque - low-inertia capstan motor such as shown in Volume 14, Number 6, (November 1971), of the IBM Technical Disclosure Bulletin, at pages 1750-51.

Tubular printed-circuit armature 1 is rigidly supported at one end by cup- shaped hub 2. This hub is rigidly attached, as by press fit, to one end of motor shaft 3. This shaft rotates on axis 4.

The shaft is supported for rotation by spaced roller bearings 5 and 6. Tape- engaging capstan 7 is attached, as by adhesive bonding, to the other end of shaft 3. Rotation of armature 1, in the motor's magnetic field, is transmitted to the capstan and to the tape by way of the shaft.

Capstan 7 includes slot-like openings 8, evenly distributed about the 360 degrees circumference of the capstan's tape driving surface. Capstan wall 9 includes a small number of openings 10 which cooperate with a stationary vacuum manifold, not shown. The circumferential length of this manifold corresponds generally to the length of the tape-wrap about the capstan, and is for example 180 degrees. In this manner, vacuum force is applied to hold the tape in nonsliding engagement with the capstan 7.

Both capstan wall 9 and wall 11 have a thickness taper; namely, the wal...