Multiple coil hammer actuator system

Details Multiple coil hammer actuator system Multiple coil hammer actuator system

1980-03-27

1982-11-09

Crowder, Clifford D.

Printing

Selective or progressive

Bed and platen machines

101 9304, 101 9348, B41J 912

Patent

active

043578675

ABSTRACT:
A print hammer actuator system for a dot matrix line printer comprising a plurality of coils greater than the number of dot imprinting hammers to be actuated by the coils is disclosed. The coils (C1, C2 . . . C80 or 61, 62, 63 . . . 69) are mounted side-by-side in a fixed position; and, the hammers (H1, H2 . . . H40 or 51, 53, 55, 57) are oscillated back and forth in the regions where magnetic fields are produced by energized coils. As the hammers are oscillated, the coils are selectively energized and de-energized to actuate the hammers. Energizing the coils attracts the hammers toward the coils, against the spring force of the hammers. De-energizing the coils releases the hammers, whereby the stored spring energy creates a dot. Depending upon the position of the hammers, either one or two coils are energized and de-energized to actuate a single hammer.

REFERENCES:
patent: 3782278 (1974-01-01), Barnett et al.
patent: 4080892 (1978-03-01), Imahashi
Abraham, et al., "Multiple Energy Print Hammer", IBM Technical Disclosure Bulletin, vol. 15, No. 1, Jun. 1972.

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