Tape position detection apparatus having start control and initi

Details Tape position detection apparatus having start control and initi Tape position detection apparatus having start control and initi

1988-02-22

1990-10-16

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 742, 360137, G11B 2710, G11B 2734, G11B 1518

Patent

active

049639994

ABSTRACT:
A tape position detection apparatus is disclosed wherein a tape is first fed in a forward direction from one reel to another for a predetermined period of time, under the control of a tape transit control circuit. When the reels rotate, respective pulse generators generate pulses which are counted by corresponding reel counters. The counting periods are set by control circuits, and upon completion of a counting period, the count obtained is stored as first count data in a memory circuit. Also, as a capstan for feeding the tape rotates, a corresponding pulse generator generates pulses which are counted by capstan counters. In accordance with the count, an operational circuit calculates the residual amount of tape for presentation on a display. In the meantime, upon completion of the first counting period described above, the tape is fed in the reverse direction by a logic control circuit, during which time the count obtained when the tape was fed in the forward direction is compared, in a comparison circuit, with the count obtained when the tape is fed in the reverse direction. When the count data being compared become substantially equal, the tape is stopped.

REFERENCES:
patent: 4172231 (1979-10-01), de Costemored'arc et al.
patent: 4280159 (1981-07-01), Nakayama
patent: 4347538 (1982-08-01), Klank
patent: 4644436 (1987-02-01), Unno
patent: 4805053 (1989-02-01), Yamanaka et al.

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