Browse Prior Art Database

Single Column Tape Threading

IP.com Disclosure Number: IPCOM000095010D
Original Publication Date: 1965-Aug-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Whitney, RM: AUTHOR

Abstract

Tape is initially threaded in the tape drive from supply reel 11 to take-up reel 12 over the solid line path 15. The tape in position 15 passes from reel 11 over idler 31 to idler 32 at one open end of column 13, over guide rollers and between a photocell 23 and tape cleaner 24. The tape then passes between head 21 and H-shield 22 and from capstan 33 to idler 34 at the opposite open end of column 13 to reel 12.

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Single Column Tape Threading

Tape is initially threaded in the tape drive from supply reel 11 to take-up reel 12 over the solid line path 15. The tape in position 15 passes from reel 11 over idler 31 to idler 32 at one open end of column 13, over guide rollers and between a photocell 23 and tape cleaner 24. The tape then passes between head 21 and H-shield 22 and from capstan 33 to idler 34 at the opposite open end of column 13 to reel 12.

A plurality of vacuum openings 14 is provided centrally within column 13. Column 13 has no barriers between its ends except for the tape. Each half 13a and 13b of column 13 acts as an independent vacuum column. Each has a respective vacuum switch 16 or 17 located approximately midway between vacuum ports 14 and an open end of column 13.

Reel 11 is operated by a servo system controlled by switch 16. Reel 12 is operated by a servo system controlled by switch 17. During loading of tape into both ends of column 13, each servo system brakes its reel when atmospheric pressure is applied to the pressure switch.

The vacuum to ports 14 can be turned off at the time that the tape is initially threaded. Capstan 33 is not rotating and the vacuum is turned on. As the vacuum comes up and is applied to the vacuum switches, the reel brakes are released. The tape originally across the column ends is sucked into the columns forming loops 41 and 42. As soon as either loop moves to the vacuum port side of its switch, such as loop 42, atmospheric p...