Taut band piezoelectric actuator for wire matrix printing elemen

Details Taut band piezoelectric actuator for wire matrix printing elemen Taut band piezoelectric actuator for wire matrix printing elemen

1989-05-04

1990-05-29

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 310

Patent

active

049291009

ABSTRACT:
This invention relates to printing elements for use in a serial wire matrix printer having a plurality of driven wire printing elements. Each printing element has actuating means associated therewith to drive the elements against a ribbon from a retracted position to an actuated position and returned. Each actuating means includes an elongated drive element anchored at opposite ends thereof to piezoelectric crystal stacks. The piezoelectric stacks have electrical supply means for causing expansion of the crystal stacks responsive to an electric signal. The drive element is normally maintained in a taut bowed position and is secured to the piezoelectric crystal stacks so as to be driven toward a straightened condition upon actuation to the piezoelectrical crystal stacks to thereby drive the printing element axially to the printing or actuated position from the retracted position upon actuation of the crystal assembly. Spring biasing means are provided which coact with the printing element to return the printing element to its retracted position when the electrical signal is removed or reversed in polarity.

REFERENCES:
patent: 3473466 (1969-10-01), Thayer
patent: 3649857 (1972-03-01), Knappe
patent: 3970184 (1976-07-01), Helmrich et al.
patent: 4035671 (1977-07-01), Schafft
patent: 4193703 (1980-03-01), Sakmann
patent: 4547086 (1985-10-01), Matsumoto et al.
patent: 4589786 (1986-05-01), Fukui et al.
patent: 4783610 (1988-11-01), Kaisha
IBM Technical Disclosure Bulletin, vol. 20, No. 6, Nov. 1977, p. 2263.
IBM Technical Disclosure Bulletin, vol. 26, No. 8, Jan. 1984, p. 3984.
IBM Technical Disclosure Bulletin, vol. 26, No. 1, Jun. 1983, pp. 49, 50.

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