Track number indicator

Details Track number indicator Track number indicator

1983-08-04

1986-04-29

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record medium

In container

360 99, 360 97, 360 86, G11B 2303, G11B 5016

Patent

active

045861021

ABSTRACT:
In a magnetic disk cartridge, a dial member is rotatable relative to the cartridge housing to a plurality of positions for indicating the number of tracks recorded on a disk surface. A resilient locking finger is connected to the dial member for engaging respective engagable means on the housing, which correspond to the various track number positions. Whenever the cartridge is removed from a recording and/or playback apparatus, the locking finger engages one of the engagable means to prevent the dial member from rotating out of the last position to which it was rotated. An access opening is provided in the housing to receive a rotational driver of the apparatus for rotating the dial member to its track number positions. The locking finger is supported for movement by the rotational driver to separate from any one of the engagable means as the driver is received through the access opening, thereby freeing the dial member for rotation by the driver.

REFERENCES:
patent: 4264169 (1981-04-01), Harvey
patent: 4511944 (1985-04-01), Saito
Research Disclosure: "Means for Locking and Unlocking Rotable Film Units", pp. 65-67, Aug. 1978.

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