| 摘要 |
<p>In a printing hammer which is for use in a printer head and comprises a piezoelectric actuator (17) coupled to a base member (16) by a resilient coupler (23), an arm (19) carrying a printing wire (26), and a first resilient hinge (21) coupling the piezoelectric actuator to the arm, first and second resilient parts (221, 222) are used collectively as a second resilient hinge which couples the arm to the base member. The first and the second resilient parts are on both sides of the first resilient hinge on a single plane which has a step of a predetermined size relative to the first resilient hinge in a direction of its thickness. The piezoelectric actuator (17) may be fixed directly to the base member (16) in order to give the printing hammer a high printing speed. Preferably, the first resilient hinge and the first and the second resilient parts are manufactured separately of the arm and/or the base member and brazed in grooves (41, 42) formed in a thick arm end (36) with a spacing of the predetermined size, in a groove (45) formed in an actuator block (37) of the piezoelectric actuator (17), and in grooves (46, 47) formed in a pair of side legs of the base member (16). The first resilient hinge (21) may have a T form with the top stroke of the T form brazed in the groove (41). The first and the second resilient parts may be both branches of a U form.</p> |
