Browse Prior Art Database

Tape Drive Capstan

IP.com Disclosure Number: IPCOM000078134D
Original Publication Date: 1972-Nov-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Chatto, RB: AUTHOR [+3]

Abstract

This low-inertia capstan is constructed to minimize mass and maximize mechanical strength.

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Tape Drive Capstan

This low-inertia capstan is constructed to minimize mass and maximize mechanical strength.

The capstan, Figs. 1 and 2, is connected to the output shaft, not shown, of a high-torque, low-inertia motor. The capstan rotates about axis 1. Tape driving interface 2 is covered by rubber-like drive surface 3 and is adapted to engage a section of magnetic recording tape to impart movement thereto. For example, surface 2 is one-half inch wide, measured along axis 1, and cooperates with one- half inch wide tape.

The capstan is constructed of two similar shaped cups 4 and 5. These cups are formed of a thin wall light weight material, such as aluminum. The circumferential driving surface of each cup includes a number of equally spaced slots or openings 6, each of which includes a small inwardly projecting tab 7 (Fig.
3). When the two cups are positioned in alignment, as shown in Fig. 1, the slots are aligned to form a V or chevron shape. This shape mates with a similar opening pattern formed in drive surface 3. The annular mating edge of each cup meets in exact alignment to form circumferential seam 8.

Prior to assembly, a continuous reinforcing ring 9 of polycarbonate is positioned inside one of the cups, and is accurately located by engagement with the above-mentioned inwardly projecting tabs 7 associated with slots 6. The other cup is then positioned over the exposed portion of ring 9, to form abutting seam 8 with the first cup. The assembly 4, 5, 9 is g...