Browse Prior Art Database

Pneumatic System for Tape Drives

IP.com Disclosure Number: IPCOM000080253D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Ho, RY: AUTHOR

Abstract

The shown pneumatic system provides air under pressure to tape drives. The temperature and pressure of the air applied to the drives must be controlled so as to prevent damage to the tape. The air pressure regulation is key to providing air bearings for the tape as it moves through a tape drive, while the temperature control is key to preventing heat damage to the tape.

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 57% of the total text.

Page 1 of 2

Pneumatic System for Tape Drives

The shown pneumatic system provides air under pressure to tape drives. The temperature and pressure of the air applied to the drives must be controlled so as to prevent damage to the tape. The air pressure regulation is key to providing air bearings for the tape as it moves through a tape drive, while the temperature control is key to preventing heat damage to the tape.

The pneumatic system consists of a blower 10 driven by a motor 12 having a plurality of pulleys 14. Air under pressure from the blower 10 passes through an air cooler 16 and an air filter 18, before it reaches the tape drives I and II. The pressure is regulated by a regulator 20. One example of such a regulator is shown in the IBM Technical Disclosure Bulletin, Vol. 14, No. 2, July 1971, pages 390 and 391.

In operation, the pressure regulation is achieved by cooperation between blower 10 and the regulator 20. To operate at different altitudes, four different pulleys 14 are provided on the motor. These pulleys change the RPM of the blower. A pulley is provided for the following altitudes: 0 to 1,000 feet, 1,000 to 3,000 feet, 3,000 to 5,000 feet, and 5,000 to 7,000 feet. The blower revolutions per minute for each operating altitude are chosen to meet the pneumatic system requirement at worst-case operation -- low voltage and frequency for the current supplying motor 12, low-barometric pressure, and high-room temperature. With the pulley selected for this worst-case...