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    • 6. 发明公开
    • Taut band piezoelectric actuator for wire matrix printing elements
    • Piezoelektrischer Antrieb mit einem starren RiemenfürNadelmatrixdruckelemente。
    • EP0395924A2
    • 1990-11-07
    • EP90107061.5
    • 1990-04-12
    • International Business Machines Corporation
    • Patterson, William AlexanderTong, Dien HoWooden, James Robert
    • B41J2/295
    • B41J2/295
    • This invention relates to printing elements for use in a serial wire matrix printer having a plurality of driven wire printing elements (12, 18, 20). Each printing element has actuating means associated therewith to drive the elements against a ribbon from a retracted position to an actuated position and returned. Each actuating means includes an elongated drive element anchored at opposite ends thereof to piezoelectric crystal stacks (28). The piezoelectric stacks have electrical supply means for causing expansion of the crystal stacks responsive to an electric signal. The drive element is normally maintained in a taut bowed position and is secured to the piezoelectric crystal stacks so as to be driven toward a straightened condition upon actuation to the piezoelectrical crystal stacks to thereby drive the printing element axially to the printing or actuated position from the retracted position upon actuation of the crystal assembly. Spring biasing means (22) are provided which coact with the printing element to return the printing element to its retracted position when the electrical signal is removed or reversed in polarity.
    • 本发明涉及用于具有多个从动丝印元件(12,18,20)的串行线阵打印机中的打印元件。 每个印刷元件具有与其相关联的致动装置,以将元件从缩回位置驱动到带状件并返回。 每个致动装置包括一个细长的驱动元件,该驱动元件的相对端锚定在压电晶体叠层(28)上。 压电叠层具有用于响应于电信号使晶体堆叠膨胀的电源装置。 驱动元件通常保持在绷紧的弓形位置并且被固定到压电晶体叠层,以便在致动到压电晶体堆叠时被驱动朝向矫直状态,从而将打印元件轴向地驱动到打印或致动位置 在晶体组件启动时的缩回位置。 提供弹簧偏压装置(22),当电信号被移除或极性反转时,该偏置装置(22)与打印元件共同作用以将打印元件返回到其缩回位置。