Printing head of wire-dot impact printer

Details Printing head of wire-dot impact printer Printing head of wire-dot impact printer

1992-11-16

1994-03-08

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 2295

Patent

active

052922014

ABSTRACT:
A printing head including a plurality of impact printing wires constituting a dot matrix and a plurality of actuators for respectively and selectively driving the printing wires. Each actuator is constituted of a movable member to which the printing wire corresponding thereto is connected, a base member, a piezoelectric device mounted on the base member, and first and second leaf springs. The first leaf spring is connected between the movable member and the piezoelectric device, and the second leaf spring is connected between the movable member and the base member in parallel relationship to the first leaf spring. Each of the first and second leaf springs has a shape such that it is narrowest at the central portion thereof and is gradually widened toward the opposite ends thereof. Owing to this shape, a stress generating at the opposite ends of each leaf spring can be reduced to thereby prevent breakage of each leaf spring.

REFERENCES:
patent: 4787760 (1988-11-01), Nasegawa
patent: 4874978 (1989-10-01), Sakaida et al.
patent: 5005994 (1991-04-01), Yano
patent: 5078520 (1992-01-01), Yano et al.
patent: 5092689 (1992-03-01), Yano

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