Telegraphy – Systems – Printing
Patent
1981-03-06
1983-01-11
Robinson, Thomas A.
Telegraphy
Systems
Printing
101 9304, B41J 3300, B41J 312
Patent
active
043683533
ABSTRACT:
A high operational speed print head for mosaic printing is provided which has a plurality of print needles positioned on a straight line, each being selectively driven toward a piece of paper through an ink ribbon. The printer head comprises a cylindrical permanent magnet ring magnetized in the axial direction; a circular bottom plate covering the bottom of the permanent magnet; and a plurality of electromagnets each having a center core and a coil wound around the core positioned on a circle on said bottom plate so as to be surrounded by the permanent ring magnet. A yoke provides a closed magnetic path with the permanent ring magnet, the bottom plate and each of the electromagnets. A plurality of moving bodies equal in number to the number of electromagnets are provided, each having at least an elongated armature overlying the core of the related electromagnet and composing a part of said closed magnetic path. A leaf spring supports the armature and is fixed to the yoke, and a print needle is mounted perpendicular to the elongated armature.
REFERENCES:
patent: 3828908 (1974-08-01), Schneider
patent: 3896918 (1975-07-01), Schneider
patent: 3955049 (1976-05-01), MacNeill et al.
patent: 3968867 (1976-07-01), Stenudd
patent: 4167343 (1979-09-01), Golobay
patent: 4222674 (1980-09-01), Mori et al.
patent: 4225250 (1980-09-01), Wagner et al.
patent: 4273452 (1981-06-01), Honma
Meier et al., "Matrix Printer Wire Actuator", IBM Tech. Discl. Bull., vol. 20, No. 11 B, Apr. 1978, pp. 4748-4749.
Ando Hirokazu
Fukushima Kazumasa
Iwama Mitsuo
Ohmori Yasuo
Takahashi Tsunematsu
Nippon Telegraph & Telephone Public Corporation
OKI Electric Industry Co., Ltd.
Robinson Thomas A.
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