Type face striking system in an office writing machine

Details Type face striking system in an office writing machine Type face striking system in an office writing machine

1983-12-05

1989-06-27

Wiecking, David B.

Typewriting machines

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

Imprint by movement of record-medium against type-face

101 9302, 101 9329, B41J 942

Patent

active

048424293

ABSTRACT:
A type face striking system for striking a type face to produces an imprint on a record carrier in a writing machine, the system including; an electromagnetically actuatable printing hammer movable under the influence of an electrically generated magnetic field between a rest position and a striking position for striking the type face; an actuating device including a magnetic field producing means in the form of a conductor coil connected for receiving an operating voltage for producing the electrically generated magnetic field; and a control unit connected to the coil and operative for successively applying thereto: a voltage pulse of a first polarity for causing the actuating device to produce a magnetic field which effects movement of the hammer from its rest position to its striking position; and a voltage pulse of a second polarity, opposite to the first polarity, for causing the actuating device to produce a magnetic field which effects movement of the hammer from its striking position toward its rest position.

REFERENCES:
patent: 3905294 (1975-09-01), Barrus et al.
patent: 4273039 (1981-06-01), Luo et al.
patent: 4306207 (1981-12-01), Tada et al.
patent: 4348119 (1982-09-01), Carson, Jr. et al.
patent: 4429342 (1984-01-01), Heider
IBM Technical Disclosure Bulletin, W. T. Pimbley, Settle Out Control for Moving Coil Print Hammer, 11-78, vol. 21, No. 6, pp. 2283 and 2284.

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