Electric acutating device

Details Electric acutating device Electric acutating device

1976-05-03

1978-04-18

Eickholt, E. H.

Printing

Selective or progressive

Bed and platen machines

335272, 310 36, H01F 708

Patent

active

040845028

ABSTRACT:
An electric actuating device for producing limited angular displacements comprising an ironless cylindrical coil mounted for rotation in an air gap of a magnetic circuit, the magnetic circuit being formed by a permanent magnet placed inside the coil and an outer part of magnetically permeable material surrounding the coil. The coil is connected through spiral springs to a source of electric control pulses. The spiral springs provide a return force for bringing the coil back to a rest position in the absence of a control pulse. Means are provided for limiting the angle of rotation of the coil.

REFERENCES:
patent: 3001107 (1961-09-01), Rhodes
patent: 3138427 (1964-06-01), Stein et al.
patent: 3289133 (1966-11-01), Bieger et al.
patent: 3378799 (1968-04-01), Ouellette
patent: 3406625 (1968-10-01), Chamness et al.
patent: 3486148 (1969-12-01), Christensen
patent: 3501726 (1970-03-01), Olesen
patent: 3827543 (1974-08-01), Kawano et al.
patent: 3929067 (1975-12-01), Nishikawa et al.
patent: 3970979 (1976-07-01), Montagu
patent: 3970980 (1976-07-01), Nelson
IBM Tech. Discl. Bull., "Single-Turn Moving Coil Print Magnet," vol. 13, No. 12, May 1971, p. 3767.

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