Printing hammer assembly

Details Printing hammer assembly Printing hammer assembly

1983-09-28

1986-10-28

Burr, Edgar S.

Typewriting machines

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

Imprint by movement of record-medium against type-face

101 9348, 4001442, B41J 938, B41J 942

Patent

active

046195360

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. In the preferred embodiment, a rear end surface of the yoke defines a retracted position of the printing hammer. For this purpose, a stopper member is elastically pressed against the rear end surface of the yoke due to elasticity of a material used or magnetic forces.

REFERENCES:
patent: 3675172 (1972-07-01), Petusky
patent: 3897867 (1975-08-01), Smith, Jr.
patent: 4024588 (1977-05-01), Junssen et al.
patent: 4239401 (1980-12-01), Veale
patent: 4336496 (1982-06-01), Schnabl et al.
patent: 4363217 (1982-12-01), Venuti

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