Crescent silencing reset mechanism for fast forward 8-track cart

Details Crescent silencing reset mechanism for fast forward 8-track cart Crescent silencing reset mechanism for fast forward 8-track cart

1976-02-25

1977-09-20

Saifer, Robert W.

Advancing material of indeterminate length

With interlock means

And means to initiate operation of part

226178, 192 12BA, 325310, B65H 1722

Patent

active

040491692

ABSTRACT:
A fast forward drive for a cartridge tape player comprises upper and lower crescents which increase the effective capstan diameter in the fast forward mode. At normal playing speed the crescents index with respect to a received tape cartridge such that the capstan's surface forcibly engages the cartridge's pressure roller.
When the fast forward mode is desired a clutch couples the upper crescent to the capstan for rotation therewith. Rotational drive of the upper crescent is coupled to the lower crescent, at a predetermined phasing relationship, through a pin and trough arrangement, whereby fast forward is effected. On return to the normal play speed the upper crescent is fixedly indexed, resulting in a decreased lower crescent rotational drive and thus an increased chance of improper lower crescent alignment. To promote lower crescent indexing a second spring clutch is mounted on the capstan between the lower crescent and the housing which actively drives the lower crescent to its indexed position. In this manner a positive force operates on the lower crescent for proper indexing.
The improvement provides a bistable pivot member which selectively engages the lower spring clutch in the normal speed mode, thereby declutching the lower crescent, and totally disengages the spring clutch in the fast forward mode thereby providing a silent fast forward mode of operation.

REFERENCES:
patent: 3233806 (1966-02-01), Shirai
patent: 3850357 (1974-11-01), Lace

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