Dot matrix print head having easily removable magnets

Details Dot matrix print head having easily removable magnets Dot matrix print head having easily removable magnets

1988-09-01

1990-05-01

Wiecking, David A.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, 4001572, B41J 312

Patent

active

049213644

ABSTRACT:
A printing head for a dot matrix printer is disclosed which facilitates assembly and disassembly and improves printing quality.
The printing head has a plurality of hammers carrying respective printing wires, a plurality of coils each of which corresponds to each of the hammers, and a permanent magnet for retaining the hammers at the standing positions thereof, so that the magnetic flux of the permanent magnet is cancelled by exciting the coils so as to release the hammers, thereby driving the printing wires by virtue of the elasticity of the hammers. The printing head includes an annular base which is provided with, at the outer portion thereof, a hammer mounting portion for securing a plurality of hammer base portions, at the inner portion thereof, a plurality of implanted columnar cores around which respective coils are wound, and a short-circuiting portion which constitutes the closed magnetic circuits of the respective coils in cooperation with respective hammers. The permanent magnet is attached to the outside of the short-circuiting portion and the hammer mounting portions at the outer periphery of the base. The printing head is sub-assembled before the attachment of the permanent magnet.

REFERENCES:
patent: 4167343 (1979-09-01), Golobay
patent: 4225250 (1980-09-01), Wagner et al.
patent: 4539905 (1985-09-01), Zenner

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