Print head for dot matrix printers

In a print head for dot matrix printers comprising:

• a head frame and
• a plurality of stylus actuator units being arranged in parallel to each other and secured to said head frame;
• each of said stylus actuator unit having;
• an electromagnetic actuator fixed to said head frame and energized by an impact driving current,
• a yoke base fixed to said stylus actuator unit,
• an armature rockably supported to said yoke base while fixing a stylus for printing to one end thereof and having at the other end thereof a plunger attracted by said electromagnetic actuator,
• whereby said stylus is impacted to recording paper by attracting said plunger when said impact driving current is supplied to said electromagnetic actuator:
• the improvement comprising:
• a support member supporting said armature at an intermediate position between the stylus fixing end and the plunger fixing end on said yoke base such that the direction in which said stylus is impacted is reversed to the direction in which said plunger is attracted;
• said support member being composed of a torsion leaf spring having two side portions, a central portion, and an end portion with both side portions being coplanarly fixed to said yoke base and the central portion supporting said armature fixed thereto, said central portion having a torsion property in the direction of impact of said stylus with respect to the stationary side portions;
• said torsion spring being provided at at least one part thereof with a bent portion which is bent in the direction substantially orthogonal to the plane in which said side portions are fixed so as to enhance the rigidity of said torsion spring and prevent said torsion spring from warping.