| 摘要 |
1,193,503. Typewriters &c. INTERNATIONAL COMPUTERS Ltd. 7 March, 1968 [10 March, 1967], No. 11305/67. Heading B6F. [Also in Divisions G1, G5 and H2] An actuator e.g. for impulsing a hammer of a high speed line printer in which an output member 32 is movable with respect to a body structure 14 in response to a signal applied to piezoelectric elements comprises, as shown a pair of stacks of piezo-electric elements 22 disposed at right angles to each other and each clamped by tie bolts 23 between a plate 24 and a spring washer 27. The washers permit movement of the stacks to be transmitted through rods 33, 34 to a system of preferably integral levers 41, 44, 51 which in turn amplify and transmit the movement to the output member 32. The signal is applied to the stacks so that one expands and the other contracts whereby the lever system sums the movements of both whilst the mutually perpendicular arrangement of the stacks ensures that movements thereof caused by changes in ambient temperature cancel each other out. More than two stacks may be provided. |
