Printing – Selective or progressive – Bed and platen machines
Patent
1982-09-22
1984-04-10
Burr, Edgar S.
Printing
Selective or progressive
Bed and platen machines
101 9348, B41J 300
Patent
active
044414218
ABSTRACT:
Print hammer apparatus comprising a hammer preferably having a non-magnetic flexure provided with a magnetic hammer head and stylus and held in a normally retracted position by a permanent magnet. A pole piece, for concentrating magnetic flux onto the hammer head, is in magnetic contact with the permanent magnet and defines a slot in which the hammer head is received. The hammer head is separated from the pole piece by a minute air gap. An electromagnet is operable, upon activation, to release the hammer from its retracted position for printing. The unique pole piece and hammer head combination and the use of non-magnetic flexures in specialized forms maximize hammer speed for pre-selected forces at pre-selected retracted distances. Positioning the stylus at the center of percussion of the flexure and alignment of longitudinal axes of hammer head, the pole piece ofthe electromagnet, and the stylus also contribute to superior performance.
REFERENCES:
patent: 3228325 (1966-01-01), Miller
patent: 3742800 (1973-07-01), Frohrib
patent: 3941051 (1976-03-01), Barrus et al.
patent: 4190847 (1980-02-01), Stenudd
patent: 4224589 (1980-09-01), Tamulis
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patent: 4359937 (1982-11-01), Helinski
University Physics, by Francis Weston Sears et al. Published 1955, pp. 644-645.
IBM Technical Disclosure Bulletin "Print ? Mechanism" by R. D. Mathews, vol. 19, No. 9, Feb. '77, pp. 3245-3246.
Burr Edgar S.
Horton Paul F.
Weresh John A.
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