Printing – Selective or progressive – Bed and platen machines
Patent
1975-08-29
1977-03-29
Coven, Edward M.
Printing
Selective or progressive
Bed and platen machines
101 9334, 101 9348, B41J 938
Patent
active
040142582
ABSTRACT:
Equipment for use in a high speed line printer or the like is disclosed which includes a series of independently actuatable print hammers mounted for reciprocation in adjacent side-by-side paths. All hammers are mounted on current carrying spring supports. The shank of each hammer carries a coil which is positioned with the turns of each coil lying in planes which are normal to fields generated by rectangular permanent magnets, e.g. sintered ceramic magnets, which are disposed on opposite sides of the hammers, and which have zones of opposite polarity extending transversely of the series of hammers. The coils on the hammers are located within portions of the fields generated by said zones of opposite polarity so that the hammers are individually driven along their paths upon delivery of an electrical impulse to the coils carried by the selected hammers. Also disclosed is an arrangement of the coils on the hammers whereby coils are mounted in a staggered array with the coils on adjacent hammers disposed on opposite sides of the hammer shanks. The coils adjacent one another on the same side of the hammers are arranged in stepwise fashions longitudinally of the hammers. All hammer supports are shown as being mounted on common base members which also carry a printed circuit board which provides the control circuit for selectively impulsing the individual hammers in the series.
REFERENCES:
patent: 3072045 (1963-01-01), Goin
patent: 3087421 (1963-04-01), Irwin et al.
patent: 3172352 (1965-03-01), Helms
patent: 3282203 (1966-11-01), Kalbach et al.
patent: 3285166 (1966-11-01), Helms et al.
patent: 3735698 (1973-05-01), Lenders et al.
patent: 3780650 (1973-12-01), Meier
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