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21. 发明专利

JPH01233338A LOAD DETECTOR USING PIEZOELECTRIC SENSOR 失效
公开(公告)号：JPH01233338A
公开(公告)日：1989-09-19
申请号：JP5982388
申请日：1988-03-14
申请人： ELCO KK , TOYAMA PREFECTURE
发明人： MACHINO TOSHIMICHI , ODA SEIJI , TOUHO KIHACHIROU , TSUNOSAKI MASAHIRO
IPC分类号： G01L1/16 , G01L5/00
摘要： PURPOSE:To eliminate the effect of a drift and thereby to detect a cutting load accurately, by disposing two piezoelectric sensors so that a load applied to one piezoelectric sensor is increased by the cutting load and that a load applied to the other piezoelectric sensor is thereby decreased. CONSTITUTION:Sheet-shaped piezoelectric sensors 1a and 1b are set on a feed screw mechanism which moves a work table or a tool stage of a machine tool. The piezoelectric sensors 1a and 1b are disposed on the opposite sides of a feed nut, for instance, so that a load applied to the sensor 1a is increased in accordance with a cutting load and that a load applied to the sensor 1b is decreased, to the contrary, in accordance with the cutting load. Electric charges generated by the sensors 1a and 1b are amplified by charge amplifier circuits 2a and 2b and converted into voltages. An output of the amplifier circuit 2b is inverted by an inverter circuit 6 and added to an output of the amplifier circuit 2a by an addition circuit 5. Then the charges of the sensors 1a and 1b leak through input impedances of the amplifier circuits 2a and 2b, and therefore a drift to be generated is offset.

22. 发明专利

JPH01163635A METHOD FOR MEASURING AND CONTROLLING TEMPERATURE OF SHAPE MEMORY ALLOY 失效
公开(公告)号：JPH01163635A
公开(公告)日：1989-06-27
申请号：JP32178787
申请日：1987-12-21
申请人： ELCO KK , KITA NIPPON DENSHI KK , TAKANO GIKEN KK , TAKAGI SEIKO KK , TOYAMA PREFECTURE
发明人： FUJISHIRO TOSHIFUMI , YAMADA SHUNICHI , IBARAKI MASANORI , ISHIZAKI HIROSHI , TAKIMORI YUKIHIRO , NISHIDA NOBUTAKA , TSUNOSAKI MASAHIRO , YOSHIDA TSUTOMU , YANO KATSUMI
IPC分类号： G01K7/00 , G01K7/02 , G01K11/00 , G12B1/00
摘要： PURPOSE:To accurately control the operation of an actuator, etc., by bringing a metal of composition different from the shape memory allow into contact with the shape memory alloy and detecting the temperature variation of the shape memory alloy as thermoelectromotive force. CONSTITUTION:A different kind of metal is brought into contact with the shape memory alloy, which is applied with a pulse current to generate heat; and the amount of a pulse current applied to the shape memory alloy speedily when the pulse current is OFF at the temperature at which the shape memory alloy changes from a martensite phase to a base phase or from the base phase to the martensite phase is controlled. The pulse width of the current pulse current is preferably about 0.01-1sec because the amount of the pulse current is controlled after the detection of thermoelectromotive force and the processing of detection data. When this method is used for the actuator, etc., of the manipulator part, etc., of a robot, the temperature at which the shape memory alloy changes from the martensite phase to the base phase or from the base phase to the martensite phase is measured speedily and accurately.

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