Impact printer hammer assembly

Details Impact printer hammer assembly Impact printer hammer assembly

1978-11-01

1980-12-16

Eickholt, E. H.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Including type-faces movable relative to type-face-carrier

335262, 335263, 101 9302, 101 9334, 101 9348, B41J 108, B41J 900

Patent

active

042394015

ABSTRACT:
In a solenoid driven hammer for an impact printer, the armature, which is driven by the magnetic field provided by the solenoid's coil, is integral with the hammer which strikes a printing element on a print wheel. The shape of the pole piece in the solenoid conforms to the shape of the leading surface of the armature to provide a magnetic force field that is of constant strength as the armature is propelled toward the pole piece when the solenoid coil is energized. The hammer, being unitary with the armature, is thereby propelled against the printing element. As the hammer rebounds after striking the printing element, the armature strikes a polyurethane cushion which absorbs substantially all of the energy of the armature/hammer unit, thereby bringing the unit to a complete stop so that the next stroke may be quickly commenced.

REFERENCES:
patent: 2531500 (1950-11-01), Claytor
patent: 2651744 (1953-09-01), Acklin et al.
patent: 3900094 (1975-08-01), Larsen et al.
patent: 4016965 (1977-04-01), Wirth et al.
patent: 4034841 (1977-07-01), Ohyama et al.
patent: 4149132 (1979-04-01), Richter et al.

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