Hammer assembly for a serial typing device

Details Hammer assembly for a serial typing device Hammer assembly for a serial typing device

1979-07-09

1982-01-05

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

101 9348, 4001442, 4001572, 400166, B41J 792

Patent

active

043087949

ABSTRACT:
A hammer assembly for a serial typing device which comprises a character bearing disk having a central hub and a plurality of flexible laminae radiating therefrom each carrying a particular character. The hammer assembly comprises a hammer which is actuatable for selectively causing the lamina of the selected character to strike against a sheet bearing platen for typing. The hammer is directly fixed to the armature of a plunger electromagnet which is energizable with a substantially constant current. The fixed pole pieces of the electromagnet and the armature connected to the hammer have pole surfaces inclined with respect to the longitudinal axis of the hammer, so that the impact force of the hammer varies directly as the energization time of the electromagnet while it remains substantially constant during the entire stroke of the hammer.

REFERENCES:
patent: 3302562 (1967-02-01), Nelson
patent: 3335659 (1967-08-01), Schacht et al.
patent: 3900094 (1975-08-01), Larson et al.
patent: 3941052 (1976-03-01), Dalziel
patent: 4016965 (1977-04-01), Wirth et al.
patent: 4070963 (1978-01-01), Weaver
patent: 4103617 (1978-08-01), O'Brien et al.
patent: 4137513 (1979-01-01), Reece et al.
patent: 4162858 (1979-07-01), Brandenburg
patent: 4192230 (1980-03-01), Blom et al.
Engel et al., IBM Tech. Discl. Bulletin, vol. 15, No. 3, Aug., 1972, p. 916.

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