Circuit for detecting the end of a tape by counting reel revolut

Details Circuit for detecting the end of a tape by counting reel revolut Circuit for detecting the end of a tape by counting reel revolut

1988-04-01

1989-09-12

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360137, G11B 1522, G11B 1548

Patent

active

048665479

ABSTRACT:
An end-of-tape detection apparatus provides a constant accumulated total of the revolutions of the supply and takeup reels relative to the true end-of-tape defined by the leader-to-tape splice. Counter means stores a value indicative of the true end-of-tape, and also counts and stores the accumulated total of revolutions as the tape is wound onto a reel. Thereafter as tape is pulled from the reel, the approaching end-of-tape is accurately known in terms of the remaining revolutions of the reel. A microprocessor uses the stored value to determine the point at which deceleration of the tape should begin, whereby the tape rapidly is decelerated to a selected speed just prior to true end-of-tape. The tape is stopped upon sensing the leader-to-tape splice.

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Werner, "Tape . . . System", IBM Tech. Disc. Bull., vol. 14, No. 2, Jul. 1971, p. 613.
Holman et al., "Rewind . . . Tape", IBM Tech. Disc. Bull., vol. 14, No. 2, Jul. 1971, p. 608.
Roberts, "Linear . . . Servomechanism", IBM Tech. Disc. Bull., vol. 13, No. 10, Mar. 1971, p. 3155.

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