Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent
1989-08-29
1991-07-23
Wiecking, David A.
Typewriting machines
Typing by other than type-face or type-die
Character formation by impact
400701, B41J 224
Patent
active
050338846
ABSTRACT:
A wire dot printing head includes armatures each of which is coupled to a printing wire, a felt guide for reducing the friction between the printing wires and a printing wire guide, a residual sheet disposed over a magnetic core frame, a biasing leaf spring, and a oil leakage preventing member. Such member is disposed over the armatures to intercept oil flowing from the felt guide. An erroneous dot printing operation due to the arms of the leaf spring sticking to the residual sheet is prevented.
REFERENCES:
patent: 3889793 (1975-06-01), Cattaneo
patent: 3893220 (1975-07-01), Bittner
patent: 3907092 (1975-09-01), Kwan et al.
patent: 4010836 (1977-03-01), Bernardis et al.
patent: 4023663 (1977-05-01), Engler
patent: 4226544 (1980-10-01), Davenport et al.
patent: 4511269 (1985-04-01), Takahashi et al.
patent: 4687355 (1987-08-01), Ikehata et al.
Andou Hirokazu
Koyama Tatsuya
Tatsukami Masahiro
Yamada Tetsuhiro
OKI Electric Industry Co., Ltd.
Wiecking David A.
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