Two lever print actuator with aligned pivots and energy transfer

Details Two lever print actuator with aligned pivots and energy transfer Two lever print actuator with aligned pivots and energy transfer

1985-09-20

1987-11-03

Burr, Edgar S.

Printing

Selective or progressive

Bed and platen machines

101 9333, 101 9348, 4001572, B41J 938, B41J 910

Patent

active

047036893

ABSTRACT:
A two-lever electromagnetic print actuator having a pivoted bellcrank armature and an end-pivoted print hammer is urged to free-flight by energy transfer at an energy transfer contact surface. The armature pivot, print hammer pivot and energy transfer surface are aligned in sequence and substantially coplanar. This converts input energy to optimum print velocity with minimum wear. In operation, energizing a coil attracts the armature to the stator, imparting energy to an energy transfer surface on an energy transfer armature leg. The energy transfer surface moves in an arc, delivering energy to a related energy transfer surface on the print hammer. The print hammer goes into pivoted free-flight when the armature strikes a stop pad. There is mimimum sliding, and thus minimum wear, between the energy transfer surfaces of the print hammer and armature as they both move in arcs of similarly convex circles which remain tangent at their contact point. The two-lever print actuator provides a low mass print hammer with a short contact time; the hammer moves at a substantially higher velocity than the armature at the pole face due to the optimized lever length ratios.

REFERENCES:
patent: 3164085 (1965-01-01), Hawkins
patent: 3266419 (1966-08-01), Erpel et al.
patent: 3593657 (1971-07-01), Guzak, Jr.
patent: 3630142 (1971-12-01), Fulks et al.
patent: 3643594 (1972-02-01), Pipitone
patent: 3919933 (1975-11-01), Potter
patent: 3924725 (1975-12-01), Kuhn et al.
patent: 4269117 (1981-05-01), Lee et al.
patent: 4442770 (1984-04-01), Dozier
H. Lee et al; "Two-Piece Hammer"; IBM Technical Disclosure Bulletin; vol. 27, No. 4A, pp. 2090-2092; Sep. 1984.

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