Electro-magnetic print hammer

Details Electro-magnetic print hammer Electro-magnetic print hammer

1979-07-11

1981-05-26

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

101 9348, B41J 942

Patent

active

042691176

ABSTRACT:
An electro-magnetic print hammer comprises a single magnetic hammer element in which an impact mass is coupled to a pivotted armature by flexible stem. The hammer-stem has (N+1/2) periods of oscillation at its resonant frequency during the free flight time of the hammer mass. A permanent magnet with a strong magnetic force which decays rapidly with distance holds the hammer element fixed upon motion of the armature until the armature torque exceeds the magnet holding force to cause the hammer mass to break loose with a snap action. Stop means prevents armature impacts with the operating pole piece of a stator core. The visco-elasticity of the armature stop matches the rebound characteristics of the print medium when impacted by the hammer mass.

REFERENCES:
patent: 3195453 (1965-07-01), Thiemann
patent: 3266418 (1966-08-01), Russo
patent: 3513773 (1970-05-01), Ponzano
patent: 3714892 (1973-02-01), Perry
patent: 3741113 (1973-06-01), Mako et al.
patent: 3747521 (1973-07-01), Hamilton et al.
patent: 3919933 (1975-11-01), Potter
Engel et al., IBM Tech. Discl. Bulletin, vol. 15, No. 3, p. 916, Aug. 1972.
Mathews, IBM Tech. Disclo. Bulletin, vol. 19, No. 9, pp. 3245-3246, Feb., 1977.
Gilbert et al., IBM Tech. Discl. Bulletin, vol. 17, No. 3, pp. 780-781, Aug., 1974.
Mulzet et al., IBM Tech. Discl. Bulletin, vol. 16, No. 11, pp. 3529-3531, Apr., 1974.

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