Browse Prior Art Database

Tension Transducer

IP.com Disclosure Number: IPCOM000089593D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Crawford, RP: AUTHOR [+2]

Abstract

This article describes a tension transducer for monitoring and controlling the tension in a flexible web, such as a magnetic tape.

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Tension Transducer

This article describes a tension transducer for monitoring and controlling the tension in a flexible web, such as a magnetic tape.

Tape 9 is fed from reel 10 to reel 11 (Fig. 1) via a tape feed path including an idler 12, read-write head 13, tape guides 14, 15 and an idler 16. Idler 16 is coaxially connected (Fig. 2) to one cylinder 17 of the two cylinders 17, 18 of a ROLAMITE*-type device.

The ROLAMITE device also comprises a flexible metal band 19 that is secured at its respective ends and confined between divergent insulating rails 20,
21. Band 19 is entrained around cylinders 17, 18. Embedded in rails 20, 21 are metal plates 22, 23 connected to +V and -V, respectively. Thus, each rail serves as the dielectric between the band 19 and one of the plates 22, 23, for providing two variable capacitors. The capacitances C1, C2 across each capacitor will vary as the cylinders are shifted in the direction of the arrows in Figs. 1 and 2, due to tape tension changes. These capacitance values are compared differentially to give an error signal that is fed back via a servo means (not shown) to control tape tension.

To provide relatively high return force with a minimal thickness of band 19, rails 20, 21 are arranged to diverge, as shown, with their one ends being pivotally connected, as by pin 24, while their opposite ends are pulled toward each other by a helical spring 25.

Thus the combination of spring 25, the angle between the rails and the angle of...