Long release coil hammer actuating mechanism

Details Long release coil hammer actuating mechanism Long release coil hammer actuating mechanism

1985-05-03

1986-04-29

Pearson, Charles A.

Printing

Selective or progressive

Bed and platen machines

101 9348, 400121, B41J 302

Patent

active

045849374

ABSTRACT:
An actuating mechanism includes a magnetic circuit formed by a permanent magnet (43), a flux plate (45), a return plate (47), a post (49), and a long release coil (51). The outer end of the release coil (51) terminates slightly short of the tip of the post. Further, the post (49), long coil (51), flux plate (45) and return plate (47) are sized and positioned such that the tip of the post (49) lies coplanar with the outer surface of the return plate (47) and such that the end of the return plate (47) terminates just short of the release coil (51). The head (59) of a hammer (53) is positioned to be attracted to the post tip by the magnetic flux created by the permanent magnet (43). The permanent magnet attraction force bends the head (59) of the hammer (53) across the small gap resulting in the hammer (53) being cocked. When the long release coil (51 ) is energized, it produces a magnetic field that counteracts the permanent magnet attraction force, releasing the cocked hammer. Release of the cocked hammer impacts a ball (61), welded to the side of the hammer (53) remote from the pole tip, against a ribbon to create a dot on a print-receiving medium. Because the release coil (51) terminates just short of the tip of the post (49), the intensity of the flux produced by the coil (51) at the interface between the post tip and the hammerhead (59) is high.

REFERENCES:
patent: 4190847 (1980-02-01), Stenudd
patent: 4233894 (1980-11-01), Barrus et al.
patent: 4351235 (1982-09-01), Bringhurst
patent: 4393771 (1983-07-01), Tatsumi
patent: 4438692 (1984-03-01), Yanadori et al.
patent: 4503768 (1985-03-01), Whitaker
patent: 4509421 (1985-04-01), Kurihara et al.
IBM Technical Disclosure Bulletin, "Solenoid Structure Having Enhanced Force" vol. 22, No. 5, Oct. 1979, p. 1744 by McCarty.

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