Printing hammer assembly with a hammer dampener comprising two o

Details Printing hammer assembly with a hammer dampener comprising two o Printing hammer assembly with a hammer dampener comprising two o

1984-01-13

1985-07-23

Coughenour, Clyde I.

Printing

Selective or progressive

Bed and platen machines

101 9348, 4001571, 4001572, 400167, B41J 942, B41J 900

Patent

active

045302804

ABSTRACT:
A printing hammer assembly for use in impact printers includes a printing hammer which has an impact surface and an armature and which is supported to be movable in a reciprocating manner along its longitudinal axis, a driving solenoid which drives to move the printing hammer forward when energized against the force of a coil spring which normally applies a biasing force to the printing hammer in the backward direction and a yoke leading a magnetic flux produced by said solenoid to the armature of printing hammer. A pair of magnets are disposed such that they are magnetically repulsive to each other with one of them fixed in position and the other movable over a predetermined distance thereby allowing to absorb the rebounding energy of the hammer when it returns to its home position.

REFERENCES:
patent: 3117256 (1964-01-01), Gamblin
patent: 4062285 (1977-12-01), Deetz
patent: 4389131 (1983-06-01), Kondo
J. E. McGuire, Print Hammer, IBM Technical Disclosure Bulletin, vol. 19, No. 6, Nov. 1976, p. 2036.
J. E. Lee and S. A. Okcuoglu, Dual-Coil Print Hammer, IBM Tech. Disclosure Bulletin, vol. 22, No. 12, May 1980, p. 5398.
A. B. Habich, Print Hammer Rebound Control, IBM Technical Disclosure Bulletin, vol. 22, No. 10, Mar. 1980, p. 4348.

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