Wac Data Service Kabushiki Kaisha

Wac Data Service Co., L Td.

Cdk Co., Ltd.

Satoshi Enomoto

Kazuhisa Watanabe

Hiroshi Enomoto

A needle selector for a knitting machine which selects a working needle by using a piezoelectric body having piezoelectric element is provided, in which an intermediate position between a rear end portion and front end portion of the piezoelectric body movably supported by a housing is rotatably held by the housing by using a rotary member to stabilize vibration of the piezoelectric body, a sectional structure of the rotary memberon a plane which is perpendicular to an axis of the rotary memberand perpendicular to a plane of the piezoelectric body is formed such that a bend in a widthwise direction of the piezoelectric bodyis suppressed to be smaller than a bend in the longitudinal direction, so that a vibration speed and torque of the piezoelectric body further increase and energy saving is achieved.

Needle selector for knitting machine

To make it possible to sustain a low power consumption for the entire driver in a driver of a piezoelectric actuator, by reducing the number of components and switching the piezoelectric actuator at a high speed. Common resistors Ra and Rb for current limitation are interposed at some midpoint of the feeder linesand. Phototransistors Qto Qare connected to the power source side of the common resistors Ra and Rb of the feeder linesand. Piezoelectric actuatorstoare connected to terminals Sa and Sb of the common resistors Ra and Rb on the side opposite to the power supply section, and to the joints of the phototransistors Qto Q. Light emitting diodes Dto Dare disposed in proximity to the phototransistors Qto Q, and the light emitting diodes Dto Dare switched and conducted at a switching control section. The switching control sectionoverlaps conduction control of the light emitting diodes Dto Dcorresponding to the next piezoelectric actuatorsto, after the 70% charged state of the piezoelectric actuatorstoin association with the on-operation of the piezoelectric actuatorsto

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Saitama, Japan

Satoshi Enomoto