Dot printer head

Details Dot printer head Dot printer head

1982-07-29

1984-03-20

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 312

Patent

active

044377754

ABSTRACT:
In this invention, the rear ends of the printing needles are bent and prevented from being pulled out by being embedded in needle caps. The needle caps are flat, and the longitudinal directions of the cross-sections of the needle caps are coincident with the radial direction of the printer. The rear ends of the needles are arranged in annular form. Each needle cap is slidably held by a guide body. Lateral displacement of the needles is prevented, and the contacting area between the needle caps and an armature of an electromagnet is reduced. A ring connecting the rear ends of the needles is reduced in size, providing a margin at both sides of the needle cap and armature. The bending amount of the needle is reduced, and the sliding resistance of the needle is reduced, which improves the durability of the needles and the needle guides. Also a small armature may be used, thereby saving on the consumption of power in that an electromagnet of small capacity may be used. The device as a whole is compact, and high-speed printing can be effected.

REFERENCES:
patent: 3672482 (1972-06-01), Brumbaugh et al.
patent: 3994381 (1976-11-01), Hebert
patent: 4143979 (1979-03-01), Boyd
patent: 4244658 (1981-01-01), Mori

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