Browse Prior Art Database

Tape Tension Control

IP.com Disclosure Number: IPCOM000049629D
Original Publication Date: 1982-Jun-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 3 page(s) / 47K

Publishing Venue

IBM

Related People

Andresen, R: AUTHOR [+6]

Abstract

Air pressure between a tape and an air bearing tape guide is sensed by a pressure transducer to control the tape tension in a reel to reel drive. In one embodiment three air bearings guide the tape through a U-shaped path. The center air bearing guide includes a pressure transducer in the guide that monitors the air pressure between the guide and the tape as it passes the guide. In a second embodiment a pressure transducer is located along the path of a compliant air bearing guide.

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Tape Tension Control

Air pressure between a tape and an air bearing tape guide is sensed by a pressure transducer to control the tape tension in a reel to reel drive. In one embodiment three air bearings guide the tape through a U-shaped path. The center air bearing guide includes a pressure transducer in the guide that monitors the air pressure between the guide and the tape as it passes the guide. In a second embodiment a pressure transducer is located along the path of a compliant air bearing guide.

A pressure transducer can be placed in an air bearing of a tape drive with the pressure transducer sensing the air pressure between the tape and the air bearing. The output of the transducer can be used to control the tape tension. A tension arm is generally used in reel to reel tape drives to control the tape tension as the tape passes over a transducer to read and/or write magnetic transitions onto the tape. The pressure transducer is made a part of the servo system that controls the reel drive motors. One embodiment of an air bearing guide which is used to accurately monitor the tension in a moving flexible web is shown in Fig. 1.

The air bearing guide of Fig. 1 includes three air bearings 1, 2 and 3 each fastened to a mounting block 4. The mounting block 4 includes air passages 5 and 6 for directing air pressure to the air bearing guides. Air inlet 5 directs the air pressure through a passageway 7 into air bearing guides 1 and 2. Air inlet 6 directs air pressure to the air bearing guide 3. The air bearing guides 1, 2 and 3 are placed such that a U-shaped tape path is formed. A pressure transducer 9 is mounted in the air bearing guide 3. To control the tension in the tape, air pressure is directed to the air pressure inlets 5 and 6 to cause an air bearing to form at the active surfaces of the air bearing guides 1, 2 and 3. The tape is directed through tape path 8 past the air...