Dot printing apparatus

Details Dot printing apparatus Dot printing apparatus

1977-12-06

1979-06-12

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, 335274, B41J 310

Patent

active

041578732

ABSTRACT:
A ferromagnetic core fixed to an end of a wire is electromagnetically attracted such that the core and wire are axially moved so that the free end of the wire strikes paper through a ribbon to print a dot. A leaf spring returns the core and wire to a standby position in which the core abuts against a stopper and the leaf spring is resiliently deformed. A washer having an annular axially extending projection is urged by a compression spring against a spring seat, thereby urging the spring seat against a shoulder of a housing. The leaf spring is disposed in an annular gap between the washer and spring seat. The washer serves the dual function of preventing movement and frictional abrasion of the spring seat and absorbing impact energy of the core against the stopper upon axial wear of the core and stopper.

REFERENCES:
patent: 3755700 (1973-08-01), Buschmann et al.
patent: 3787791 (1974-01-01), Borger et al.
patent: 3940726 (1976-02-01), Gershnow
patent: 4016965 (1977-04-01), Wirth et al.
patent: 4034841 (1977-07-01), Ohyama et al.
patent: 4037704 (1977-07-01), Golobay et al.
patent: 4061219 (1977-12-01), Nishikawa et al.

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