Browse Prior Art Database

Endless Loop Read/Write Transport

IP.com Disclosure Number: IPCOM000078138D
Original Publication Date: 1972-Nov-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 85K

Publishing Venue

IBM

Related People

Arseneault, PJ: AUTHOR [+5]

Abstract

A picker arm 10 brings a cartridge 12 from a storage library, not shown, to a transfer station 14. At the transfer station, the cartridge 12 is moved by pneumatics to the read/write station 16. Spring-loaded doors 18 on the cartridge are pneumatically opened. Vacuum is applied at V2 at the bottom of the capstan chamber 20. Simultaneously, a lower vacuum is applied at VH through the back of the cartridge 12. With these two vacuums present, the tape loop stored in the cartridge is unfolded and moved down the column 22 toward the capstan chamber 20. As the head of the loop crosses the photosensing device PC-2, ambient air is permitted to enter the column through inflate ports 24. Air entering through inflate ports 24 expands the loop.

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Endless Loop Read/Write Transport

A picker arm 10 brings a cartridge 12 from a storage library, not shown, to a transfer station 14. At the transfer station, the cartridge 12 is moved by pneumatics to the read/write station 16. Spring-loaded doors 18 on the cartridge are pneumatically opened. Vacuum is applied at V2 at the bottom of the capstan chamber 20. Simultaneously, a lower vacuum is applied at VH through the back of the cartridge 12. With these two vacuums present, the tape loop stored in the cartridge is unfolded and moved down the column 22 toward the capstan chamber 20. As the head of the loop crosses the photosensing device PC-2, ambient air is permitted to enter the column through inflate ports 24. Air entering through inflate ports 24 expands the loop. As the loop crosses photosensing device PC-3, a stronger vacuum is pulled at VH, and the loop is completely expanded.

The head of the loop now enters the capstan chamber 20. At this time, capstan 26 is not present in the chamber but has been withdrawn from the chamber by capstan actuator 28. As the tape loop enters the capstan chamber 20, it expands against the capstan chamber walls and causes a pressure drop in the vacuum port V2. This pressure drop is sensed and used as a condition to activate the capstan actuator 28. Actuator 28 then pushes the capstan 26 into the capstan chamber 20. Capstan 26 carries serrated teeth 30 which engage a drive spindle 32 when the capstan is in the capstan chamber.

After the capstan 26 enters the capstan chamber 20, the vacuum V2 is changed to ambient pressure, and the loop is then d...