Browse Prior Art Database

Tension Sensor for Flexible Media

IP.com Disclosure Number: IPCOM000078357D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Nettles, ML: AUTHOR

Abstract

This tension sensor accurately measures dynamic tension variation and static tension in the tape of a magnetic tape unit. This tape is quickly accelerated from rest to a high-linear speed, often in excess of 200 inches per second. This acceleration takes place in a matter of a few milliseconds, and thus requires a tension Sensor having high sensitivity and high-frequency response; that is, a high-gain/bandwidth characteristic. This gain/bandwidth product may be made arbitrarily large for this device.

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Tension Sensor for Flexible Media

This tension sensor accurately measures dynamic tension variation and static tension in the tape of a magnetic tape unit. This tape is quickly accelerated from rest to a high-linear speed, often in excess of 200 inches per second. This acceleration takes place in a matter of a few milliseconds, and thus requires a tension Sensor having high sensitivity and high-frequency response; that is, a high-gain/bandwidth characteristic. This gain/bandwidth product may be made arbitrarily large for this device.

Fig. 1 and 2 show the construction of this low-mass tension sensor. Stationary support 1 includes two spaced surfaces 2 and 3 formed as portions of parallel cylinders. The cylinders are slightly longer than the width of bidirectionally movable magnetic tape 4, for example, one-half inch.

The tape runs freely in a plane which is substantially parallel with the plane defined by surfaces 2 and 3. The direction of tape movement is normal to surfaces 2 and 3. A small, light-weight cantilever beam 5 is mounted to extend parallel to but displaced from the plane of the tape path. The width of the beam is substantially equal to the width of the tape. The free end of the beam 5 includes a small contact cylinder 6, whose axis is normal to the beam and the tape 4 and is parallel to surfaces 2 and 3. This cylinder is equal in length to the width of the tape and is rigidly fixed to the beam 5, to provide sliding contact with the tape. Cylinder 6 d...