Dot matrix line printer and print element driver assembly theref

Details Dot matrix line printer and print element driver assembly theref Dot matrix line printer and print element driver assembly theref

1983-12-05

1985-09-10

Sewell, Paul T.

Printing

Selective or progressive

Bed and platen machines

101 9309, 400124, 400320, 400618, 400902, B41J 312

Patent

active

045399050

ABSTRACT:
A dot matrix line printer incorporates plural print element driver assemblies each including N electromagnets driving N print rods, with each electromagnet having a local magnetic circuit that includes a working air gap and a passive air gap; a permanent magnet is connected to all of the local magnetic circuits. A magnetic circuit connects all of the local passive air gaps in parallel to afford a passive air gap common to all local circuits, the reluctance of the common passive air gap being of the order of 1/N times the maximum effective reluctance of the working air gap of each electromagnet. Each armature is supported by a cantilever bias spring, biasing the armature and associated print rod away from the electromagnet poles toward a print position; a stop member progressively reduces the effective length of the cantilever spring as the armature moves toward the electromagnet poles. A one-piece shuttle engages and guides the outer ends of the print rods; the shuttle includes support arms that are flexible and resilient only in a direction parallel to the dot print line and individual print rod spring guides that are flexible and resilient only in a direction parallel to the print rod axes.

REFERENCES:
patent: 3672482 (1972-06-01), Brumbaugh et al.
patent: 3802544 (1974-04-01), Howard et al.
patent: 4077336 (1978-03-01), Talvard et al.
patent: 4192618 (1980-03-01), Kondur et al.
patent: 4200043 (1980-04-01), Nozaki et al.
patent: 4233894 (1980-11-01), Barrus et al.
patent: 4248147 (1981-02-01), Zenner
patent: 4273039 (1981-06-01), Luo et al.
patent: 4351235 (1982-09-01), Bringhurst
patent: 4441421 (1984-04-01), Khorsand

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