Patent ID: 7769483

Claim:
A detection-signal transmitting apparatus for use on a machine that transmits ultrasonic waves generated at the time of grinding a workpiece or dressing a grindstone, the detection-signal transmitting apparatus for use on a machine, comprising: a signal-transmitting unit; and a signal-receiving unit, said signal-transmitting unit being provided together with an ultrasonic-wave sensor and attached to a rotating member that rotates together with the workpiece or a dresser used for the dressing, said signal-transmitting unit includes an analog-to-digital converter that digital-converts an output signal of the ultrasonic-wave sensor, a modulating/transmitting unit that modulates the output signal of said analog-to-digital converter and transmits the output signal by radio, a transmitting antenna that is connected to said modulating/transmitting unit, and a radio power-supply that receives radio waves transmitted from outside via said transmitting antenna, generates a necessary power-supply voltage by converting the radio waves to power, and supplies power to a digital converter and a radio transmitting unit, and said signal-receiving unit includes a receiving antenna, a receiving/demodulating unit that receives a transmitted signal of said modulating/transmitting unit via said receiving antenna, and demodulates the transmitted signal, a signal-processing unit that converts and processes a detection signal of the ultrasonic-wave sensor demodulated by said receiving/demodulating unit to a predetermined signal necessary for controlling operation of the machine, and a power-supply unit that supplies power for said signal-receiving unit, said power-supply unit supplying power by a radio signal to said signal-transmitting unit while said receiving/demodulating unit is not in a state of receiving a radio signal from said signal-transmitting unit.