Electromechanical device for changing the position of head mount

Details Electromechanical device for changing the position of head mount Electromechanical device for changing the position of head mount

1988-05-02

1990-12-18

Tupper, Robert S.

Machine element or mechanism

Mechanical movements

Rotary to or from reciprocating or oscillating

74 96, 360105, 360137, G11B 2112, G11B 554, F16H 2508, F16H 2516

Patent

active

049777874

ABSTRACT:
The invention relates to a device for changing the position of a functional element in an electrical apparatus. The particular the head-mounting plate in a magnetic-tape apparatus, the functional element being mechanically movable between a rest position towards which it is spring loaded, and two spaced-apart operating positions, i.e. a first operating position and a second operating position. The functional element is electromagnetically held in the first operating position by an electromagnetic device and, when it leaves said first position owing to the electromagnet device being de-energized, can be held in the second operating position with the aid of the mechanical holding function provided by a mechanical holding device. The mechanical holding device is constructed in such a way that when the functional element is released from the first operating position it can hold said element in the second operating position for a limited time only because its holding force is smaller than the return spring force acting on the functional element. In order to hold said element in the second operating position for a longer time, the mechanical holding function provided by the mechanical holding device can be backed up by an additional magnetic holder acting on the holding device (137).

REFERENCES:
patent: 4402020 (1983-08-01), Yokota et al.
patent: 4649446 (1987-03-01), Deutsch et al.
patent: 4757405 (1988-07-01), Laudus

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