Impact hammer

Details Impact hammer Impact hammer

1983-04-20

1985-01-29

Sewell, Paul T.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Imprint by pivoting of type-head-carrier and type-head...

400167, 4001572, 400686, 101 9302, B41J 938

Patent

active

044962533

ABSTRACT:
The inventor discloses a hammer assembly suited for use in generating impact for printers, such as printers using daisy-wheels. The assembly comprises an electromagnetic assembly for selectively producing an electromagnetic field across an air gap. A hammer element is slidably disposed in said gap so that it is biased in a rest position and moves toward another position when said field is activated.
A damping assembly is provided to dampen the reciprocating movement of the hammer element. The damping assembly has a rigid element which collides with the hammer element to bring it to a stop at its rest position. A shock absorbing element is used to dissipate the kinetic energy of the element.

REFERENCES:
patent: 3675172 (1972-07-01), Petusky
patent: 4290356 (1981-09-01), Hehl
patent: 4412197 (1983-10-01), Bohg et al.
IBM Technical Disclosure Bulletin, "Horizontal Sliding Print Mechanism", by Patterson et al., vol. 25, No. 11B, Apr. 1983.
Xerox Disclosure Journal "Multi-Impact Backstop for Print Hammer", by Mitrovich, vol. 1, No. 4, Apr. 1976, p. 21.
IBM Technical Disclosure Bulletin, "Impact Printer Hammer Damping System" by Hall et al., vol. 22, No. 8B, Jan. 1980, p. 3498.

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