Magnetic circuit and print hammer

Details Magnetic circuit and print hammer Magnetic circuit and print hammer

1982-03-08

1984-01-03

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

101 9329, 101 9348, B41J 300

Patent

active

044236751

ABSTRACT:
A high-speed print hammer and magnetic actuator is provided which operates with a minimum of power dissipation, can achieve high speed, and has very little flux leakage beyond the mechanical structure. The magnetic actuator is made up of two pole pieces having a high magnetic permeability, with a permanent magnet therebetween. A print hammer, also having a portion constructed of a material with a high magnetic susceptiblity, is pulled away from its unsprung position by the permanent magnet and contacts the faces of the pole pieces, providing a very low reluctance magnetic path between them. The print hammer is released from this cocked position by a pulsed electromagnetic field applied in a direction opposite that of the permanent magnet, the pulse pattern corresponding to the desired impact pattern of the print hammer. Lower drive power to the electromagnet is achieved by providing an alternate magnetic path having a reluctance intermediate between that provided by the print hammer when it is in contact with the pole faces, and the reluctance between the pole faces (i.e., through the air) when the print hammer is not in contact with the pole faces.

REFERENCES:
patent: 3741113 (1973-06-01), Mako et al.
patent: 3804009 (1974-04-01), Blume
patent: 3834305 (1974-09-01), Gomi
patent: 3968867 (1976-07-01), Stenudd
patent: 4044668 (1977-08-01), Barrus et al.
patent: 4109776 (1978-08-01), Ek et al.
patent: 4200043 (1980-04-01), Nozaki et al.
patent: 4224589 (1980-09-01), Tamulis
patent: 4269117 (1981-05-01), Lee et al.
patent: 4273039 (1981-06-01), Luo et al.
IBM Technical Disclosure Bulletin by Tashjian et al., vol. 10, No. 11, "Magnet with Shunt Release", 4/68.
IBM Technical Disclosure Bulletin by Helinski, vol. 23, No. 6, "Print Hammer Element", p. 2260, 11/80.
IBM Technical Disclosure Bulletin by Malmros, 12-71, vol. 14, No. 7, "Electromagnetic Devices", pp. 2227-2229.

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