Browse Prior Art Database

Vacuum Capstan and Motor

IP.com Disclosure Number: IPCOM000077625D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Guzman, AM: AUTHOR [+2]

Abstract

This high torque - low inertia capstan motor is cooled by transverse cooling as described in United States Patent 3,588,556. The vacuum source which provides cooling airflow also provides vacuum pressure to a magnetic tape drive capstan. The motor housing includes an adjustable valve which facilitates control of the capstan's vacuum force without disturbing motor cooling.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 72% of the total text.

Page 1 of 2

Vacuum Capstan and Motor

This high torque - low inertia capstan motor is cooled by transverse cooling as described in United States Patent 3,588,556. The vacuum source which provides cooling airflow also provides vacuum pressure to a magnetic tape drive capstan. The motor housing includes an adjustable valve which facilitates control of the capstan's vacuum force without disturbing motor cooling.

Capstan 1 is mounted on motor shaft 2, Fig. 3. The capstan is formed of thin-wall plastic and includes an outer tubular surface having a plurality of small openings 3. The capstan's surface is covered by a rubber-like belt 4 having large elongated slots. The capstan's outer surface is connected to a central hub 5 by a plurality of thin walls 6, which divide the capstan's interior into circumferentially spaced cavities.

Shaft 2 is rotatably supported in opening 7 of the motor's aluminum end bell
8. This end bell includes an arcuate airflow opening 9, which mates with the capstan cavities to produce a valving effect as the capstan rotates. As a result, only the approximately 180 degrees tape engaging surface of the capstan pneumatically clamps a length of magnetic recording tape 10.

The motor's interior is divided into four cavities by permanent magnets 11. Cavities 12 and 13 are connected to a vacuum source, not shown. Cavities 14 and 15 are connected to atmosphere. Cavities 14 and 15 are sealed at one end by end bell 8 and brush holder 16. The armature, not shown, is coo...