| 摘要 |
PURPOSE:To reduce manufacturing cost and to enable high speed operation of a print hammer, by providing a first thin board hinge which couples an arm for bearing a print wire with a piezoelectric element, and second and third thin board hinges arranged at both sides respectively of the first hinge with specific difference of height against the first hinge, then securing the piezoelectric element to a securing member with a fourth hinge. CONSTITUTION:A piezoelectric element 5 extends in the direction of an arrow B1 and displaces a first hinge 2 in the direction of an arrow B1. One each end of second and third hinges 3, 4 is secured to a fixed member 6 while the other each end thereof is secured to an arm 1, and since there is a step with respect to the first hinge 2, first, second and third thin board hinges 2, 3, 4 bend in the direction of an arrow C and the arm 1 starts rotary motion in the direction of an arrow C. Consequently, displacement of the piezoelectric element 5 is enlarged and the piezoelectric element 5 moves in the direction of an arrow D to carry out printing operation. Since the piezoelectric element 5 is secured through a fourth hinge 8 to the fixed member 6, bending stress occurring in the piezoelectric element 5 during printing operation is relieved. |
