Position-control mechanism for stepwise rotating members

Details Position-control mechanism for stepwise rotating members Position-control mechanism for stepwise rotating members

1975-08-27

1977-04-12

Caldwell, John W.

Communications: electrical

Audible indication

Percussion-type sound producer

340373, 324167, 335272, 310 49R, 235103, G08B 500

Patent

active

040178510

ABSTRACT:
The invention relates to a device for checking the angular position and the starting position of a roller supporting a plurality of indicating pallets, which roller is driven in stepwise rotation. The device comprises magnetic members adapted to sense the position of magnetic poles provided on the roller or on a member mechanically linked to the roller, whereby the number of steps taken by the roller, starting from a predetermined position, can be counted taking advantage of a circumferentially arranged Hall effect and without contact between the sensing members and the roller or the member mechanically linked thereto.

REFERENCES:
patent: 3328756 (1967-06-01), Prince et al.
patent: 3518665 (1970-06-01), Bristol
patent: 3710686 (1973-01-01), Hanaas
patent: 3855525 (1974-12-01), Bernin

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