Piezoelectric driver of wire-dot impact printer

Claim 1

A printing head comprising: a head base; a plurality of printing members forming a dot matrix: and a plurality of actuators, respectively, operatively connected to said plurality of printing members, for driving said printing members, each of said actuators comprising: a resiliently movable member having a first end to which said printing member is connected and a second end fixedly secured to said head base at a fixing position, said movable member having an actuating position in the vicinity of said fixing position such that a distance from said actuating position to said fixing position is much smaller than a distance from said actuating position to said first end; and an electro-distortion device, operatively connected to said moveable member, for providing a displacement of said movable member at said actuating position so that said displacement is enlarged at said first end to drive said printing member, said movable member being a flat material extending substantially perpendicular to a direction of displacement of said movable member, said movable member located between said actuating position and said fixing position and shaped as one or more triangles, in a face of said flat material, such that a base of each of said one or more triangles is located substantially at said fixing position and a peak thereof is located substantially at said actuating position.