Dot matrix print actuator

Printing – Selective or progressive – Bed and platen machines

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Details

101 9348, 400121, 400719, B41J 312

Patent

active

045274690

ABSTRACT:
An actuator assembly for a dot matrix printer of the stored energy type in which a plurality of flexible spring hammer elements are mounted in an interleaved arrangement in order to provide a compact structure. The actuator assembly includes a mounting block having upper and lower magnetic circuits and spring hammers attached to it. A portion of the magnetic circuits is coupled to the rear of the mounting block in order to facilitate heat dissipation from the actuator. The pole pieces of the magnetic circuits are positioned to reduce resonance of the spring hammers to thereby decrease cycling time. Permanent magnets utilized in the assembly are arranged in a non-symmetrical fashion in order to increase the magnetic efficiency of the device. Integrally connected pole pieces and permanent magnets are used in the assembly to reduce manufacturing costs without degrading performance.

REFERENCES:
patent: 3907092 (1975-09-01), Kwan et al.
patent: 4033255 (1977-07-01), Kleist et al.
patent: 4258623 (1981-03-01), Barrus et al.
patent: 4273039 (1981-06-01), Luo et al.
patent: 4351235 (1982-09-01), Bringhurst
patent: 4359937 (1982-11-01), Helinski
patent: 4423675 (1984-01-01), Luo et al.
patent: 4433927 (1984-02-01), Cavallari
IBM Tech. Disc. Bulletin, by H. D. Chai, vol. 24, No. 4, Sep. 1981, p. 2133.

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