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Automatic Threading Take Up Reel

IP.com Disclosure Number: IPCOM000092273D
Original Publication Date: 1968-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Rizzi, AD: AUTHOR

Abstract

This take-up reel 10 for an automatic threading magnetic tape transport always captures the tape leader. Reel 10 comprises an integrally molded rigid flange 12, a hub structure, and flexible flange 14. The hub structure comprises central hub 16 having bore 18 through which the transport take-up drive spindle passes, mounting hub 20, and leader hub 22 against peripheral surface 24 of which the leader is wound. Flange 14 is mounted in annular groove 26 about hub 20 and normally rests on hub 22 parallel to flange 12.

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Automatic Threading Take Up Reel

This take-up reel 10 for an automatic threading magnetic tape transport always captures the tape leader. Reel 10 comprises an integrally molded rigid flange 12, a hub structure, and flexible flange 14. The hub structure comprises central hub 16 having bore 18 through which the transport take-up drive spindle passes, mounting hub 20, and leader hub 22 against peripheral surface 24 of which the leader is wound. Flange 14 is mounted in annular groove 26 about hub 20 and normally rests on hub 22 parallel to flange 12.

The spacing between the flanges is slightly wider than the magnetic tape except for tapered surface 28 for urging the leader and the tape into the reel and annular groove 30 in flange 12 about hub 20. The spacing from the bottom of groove 30 to flange 14 is slightly greater than the width of the leader.

In operation, the leader is fed tangentially to reel 10 at a velocity slightly slower than the peripheral velocity of hub 20. The width of the leader being greater than the axial spacing of the flanges, flange 14 flexes outwardly. This results in a wedging action on the leader. This wedging action and the speed mismatch combine to pull the leader against surface 24 and force the tip of the leader into groove 30. Because the leader is forced into groove 30 in flange 12, it begins to wrap about the hub in a progressing spiral configuration due to groove 30 being completely on one side of reel 10. When the tip of the leader ...