Actuator for print hammer

Details Actuator for print hammer Actuator for print hammer

1989-05-24

1991-09-10

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

4001572, 101 9305, B41J 227

Patent

active

050468715

ABSTRACT:
An actuator for actuating a print hammner includes a yoke made of a magnetic material, an electromagnetic coil mounted on the yoke, and an armature rotatably supported by bearings mounted on opposite sides of the yoke. Upon excitation of the electromagnetic coil, the armature is attracted to the yoke to drive the print hammer through a push rod. The yoke includes a plurality of laminated sheets of a magnetic material formed by stamping using a press. An insulating material and an adhesive are coated on the sheets.

REFERENCES:
patent: 2725502 (1955-11-01), Chiles et al.
patent: 4085347 (1978-04-01), Lichius
patent: 4121518 (1978-10-01), Prior et al.
patent: 4382701 (1983-05-01), Davenport
patent: 4568207 (1986-02-01), Hara et al.
patent: 4594010 (1986-06-01), Jachno
patent: 4840501 (1989-06-01), Wong et al.

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