JP2006162281A - Measuring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measuring instrument for suppressing useless battery consumption and dispensing with the collection of erroneous measurement data. <P>SOLUTION: This chain operating condition measuring instrument 100 is equipped with: a semiconductor strain gage 110 for detecting the operating condition of a chain C; a transmission module 120 for radio-transmitting an output of the strain gage 110; a power feeding means 130 for supplying electric power to the strain gage 110 and transmission module 120; and an electric power supply monitoring means 140 equipped with a photoelectric conversion element 141 for generating an electromotive force by receiving a power-on optical signal given off in a non-energized state from a remote operation means 150, and a self-holding semiconductor switching element 142 changing from the non-energized state to an energized state correspondent to the electromotive force generated in the conversion element to turn on a switch for supplying electric power from the feeding means to the strain gage and transmission module. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a measuring apparatus, and more particularly, to a small measuring apparatus such as a chain operating state measuring apparatus that is attached to a small measuring member such as a link plate of a transmission chain and measures the operating state of the measuring member. Is.

  2. Description of the Related Art Conventionally, a measuring apparatus that employs a battery as a driving power source and is attached to a small member to be measured cannot be turned on / off by remote control is known. For example, the “chain operating state measuring device” described in Japanese Patent Application No. 2004-255168 already filed by the present applicant is one of them.

  By the way, in the measuring apparatus described above, since the power is turned on and then installed on the member to be measured to perform a predetermined measurement, the battery is consumed excessively for the installation time.

  Further, since the above-described measuring apparatus starts a predetermined measurement operation at the same time as the power is turned on, the measurement data collected during the installation time includes incorrect and unnecessary data.

  Furthermore, in the above-described measuring device, if the output voltage of the battery drops to such an extent that the power necessary for stable operation can not be supplied to the device due to the power consumption of the battery, the device malfunctions and erroneous measurement data is obtained. I will collect it.

  That is, in the above-described measuring apparatus, it is impossible to remotely turn on or off the apparatus due to the small apparatus structure, thereby wastefully consuming the battery and unnecessary measurement data. In addition, there is a risk that the device malfunctions due to a decrease in the output voltage of the battery and erroneous measurement data is collected.

  Therefore, the present invention solves the above-described problems. That is, the object of the present invention is to enable a device power-on operation from a remote location with a small circuit configuration even in a small device structure. Therefore, it is possible to suppress wasteful battery consumption and not to collect unnecessary measurement data, and to stop the power supply to the device when the battery output voltage falls below the specified value. It is an object of the present invention to provide a measuring apparatus that can avoid collecting erroneous measurement data according to the above.

  In order to achieve the above object, the measuring apparatus according to claim 1 includes a detection unit that detects an operating state of a member to be measured, an output unit that outputs a detection value of the detection unit to a predetermined unit, and the detection unit. And a power supply means for supplying power to the output means, a photoelectric conversion element that generates an electromotive force by receiving a power-on light signal emitted from a remote operation means in a non-energized state, and an electromotive force generated by the photoelectric conversion element All of the power supply monitoring means comprising a self-holding type semiconductor switching element that switches from a non-energized state to an energized state in response to the power supply, and turns on a switch that supplies power from the power supply means to the detection means and the output means Installed in the member to be measured, the self-holding type semiconductor switching element is turned on, and power is supplied from the power supply means to the detection means and the output means, respectively. , Characterized in that to start the measurement processing operation wherein an output operation of the detection operation and the detection value of the operation state of the object body.

  In addition to the configuration of the measurement apparatus according to claim 1, the power supply monitoring means may be configured such that the power supply monitoring means has the self-holding semiconductor switching element switched on and the power supply means. When the power is supplied from the power supply means, the voltage value of the power supply means is monitored, and when the monitored voltage value falls below a predetermined value, a power supply voltage monitoring means for outputting a power off output, and the power supply voltage monitoring means And a non-self-holding semiconductor switching element that switches off the power from the power supply means to the detection means and the output means by turning off the switch of the self-holding semiconductor switching element in response to a power-off output. And

  In addition to the configuration of the measuring device according to claim 1 or 2, the measuring device according to claim 3 is fixed to a member to be measured such as a link plate of a chain. And the output means is a transmission module comprising an integrated circuit fixed to the member to be measured for wirelessly transmitting the output of the semiconductor strain gauge, and the power supply means includes the semiconductor strain gauge and the transmission It is a battery for supplying power to the module.

  According to the measuring apparatus of the first aspect of the present invention, the detecting means for detecting the operating state of the member to be measured, the output means for outputting the detection value of the detecting means to the predetermined part, the power to the detecting means and the output means Power supply means to be supplied, photoelectric conversion element that generates an electromotive force by receiving a power-on light signal emitted from a remote operation means in a non-energized state, and from a non-energized state according to the electromotive force generated in the photoelectric conversion element All of the power supply monitoring means that is in an energized state and includes a self-holding type semiconductor switching element that turns on a switch that supplies power from the power supply means to the detection means and the output means is installed in the member to be measured. When the self-holding semiconductor switching element is turned on and power is supplied from the power feeding means to the detection means and the output means, the member to be measured is operated. Since the measurement processing operation including the detection operation of the state and the output operation of the detection value is started, the desired timing suitable for the measurement of the operation state of the member to be measured can be obtained with a small circuit configuration even in a small device structure. By enabling the apparatus power to be turned on remotely, unnecessary battery consumption can be suppressed and unnecessary measurement data need not be collected.

  Further, according to the measuring apparatus according to the second aspect, in addition to the configuration of the measuring apparatus according to the first aspect, the power supply monitoring means is configured so that the self-holding semiconductor switching element is switched on. A power supply voltage monitoring means for monitoring a voltage value of the power supply means when power is supplied from the power supply means, and outputting a power-off output when the monitored voltage value falls below a predetermined value, and the power supply voltage monitor A non-self-holding semiconductor switching element that switches off the power from the power supply means to the detection means and the output means by turning off the switch of the self-holding semiconductor switching element according to the power-off output of the means Therefore, in addition to the effect exhibited by the measuring device according to the first aspect of the present invention, the power supply to the device is stopped when the output voltage of the power feeding means falls below a specified value. It is, so need not be collected measurement data error due to device malfunction.

  Further, according to the measurement apparatus of claim 3, in addition to the configuration of the measurement apparatus of claim 1 or 2, the detection means is fixed to a member to be measured such as a link plate of a chain. A semiconductor strain gauge, and the output means is a transmission module comprising an integrated circuit fixed to the member to be measured for wirelessly transmitting the output of the semiconductor strain gauge. Since the battery supplies power to the transmission module, the chain performance can be measured more easily and at a lower cost in addition to the effects of the measurement device according to claim 1 or 2 described above. it can. Specifically, a semiconductor strain gauge has a large output, for example, 50 to 100 times that of a strain gauge using a metal resistance wire, and the required measurement can be performed without an amplifier circuit. Thus, the circuit configuration of the transmission module is simplified, and an integrated circuit can be formed at a low cost and a small size. In addition, the power consumption of the transmission module is low, and power can be supplied by a small-capacity battery together with the semiconductor strain gauge, making the device less expensive and smaller than a transmission system using a metal wire strain gauge. can do. And since a transmission module becomes small, these can be easily fixed to the link plate of a chain, for example.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  In the following description, a case will be described in which the present invention is applied to a chain operating state measuring device that is attached to a small member to be measured such as a link plate of a transmission chain and measures the operating state of the member to be measured.

  In the chain operating state measuring apparatus 100 shown in FIGS. 1 to 3, the member to be measured is a chain C, and the tension of the chain C is measured.

  As shown in FIGS. 2 and 3, the chain C is connected to both ends of the outer link plate C1 and the inner link plate C2 so as to be bent by connecting pins C3. The chain C is wound around the drive side sprocket S1 and the driven side sprocket S2, and rotates in the direction of arrow A by driving the drive side sprocket S1 with a motor or the like.

  A semiconductor strain gauge (detection means) 110 is attached to the outer link plate C1. The mounting is performed by placing the semiconductor strain gauge 110 on the outer link plate C1 so that the semiconductor strain gauge 110 outputs an electrical signal due to a change in the tension of the chain C, and as shown in FIG. It is made by fixing to the link plate C1 and covering with the coating material Y.

  A transmission module (output means) 120 is attached to another outer link plate C 1 and is electrically connected to the semiconductor strain gauge 110 by a wire 101. The transmission module 120 is composed of a semiconductor integrated circuit including a bridge circuit and a transmission circuit having the semiconductor strain gauge 110 as one side, and does not include an amplifier circuit or a calibration circuit for the strain gauge. A SAW resonator that is less affected by vibration is used for the oscillation circuit of the transmission circuit. The transmission module 120 is also fixed to the outer link plate C1 with the adhesive X and is covered with the coating material Y.

  Further, a button-type battery as the power supply means 130 is fixed to the other outer link plate C1 with an adhesive X and is covered with a coating material Y. In the embodiment of FIG. 2, the power supply means 130 is electrically connected to each of the semiconductor strain gauge 110 and the transmission module 120 via the power supply monitoring means 140 with the wires (wire 102, wire 103, wire 104). Yes.

  Further, the power supply monitoring means 140 is attached to another outer link plate C1. The power supply monitoring unit 140 starts supplying power from the power supply unit 130 to the load (semiconductor strain gauge 110 and transmission module 120) in response to a power-on operation from a receiving device (remote operation unit) 150 described later. When the output voltage of the power supply means 130 falls below a specified value, the power supply to the load (semiconductor strain gauge 110 and transmission module 120) is stopped.

  The receiving device (remote operation means) 150 has a receiving circuit that can receive a signal from the transmitting module 120 and is arranged independently of the chain C. Further, in this embodiment, the receiving device 150 instructs the power supply monitoring unit 140 to turn on the power so as to supply power from the power supply unit 130 to the load (the semiconductor strain gauge 110 and the transmission module 120). An instruction circuit is included.

  In such a chain operating state measuring apparatus 100, when the chain C rotates, the outer link plate C1 expands and contracts due to the chain tension. The semiconductor strain gauge 110 converts this expansion / contraction of the outer link plate C <b> 1 into an electrical signal and outputs it to the transmission module 120. The reception device 150 receives a signal from the antenna 121 of the transmission module 120 by the antenna 151 and outputs the signal to an analysis device or the like.

  The receiving apparatus 150 causes the antenna 151 to be always located in the electric field of the transmission module 120 according to the radio wave intensity output from the transmission module 120. For example, the receiving apparatus 150 arranges the antenna 151 on the path of the chain C or on the locus of the transmission module 120 so that the radio wave from the transmission module 120 is always caught. Furthermore, if necessary, another complementary receiving device is prepared and arranged in a place with a poor reception state in the chain path to complement the reception of the receiving device 150.

  As described above, the chain operating state measuring apparatus 100 according to the present invention has a large output from the semiconductor strain gauge 110, does not require an amplifier circuit or a calibration circuit in the circuit of the transmission module 120, has a very simple circuit configuration, and manufactures the apparatus. Can be done at low cost. Furthermore, since the power consumption of the semiconductor strain gauge 110 and the transmission module 120 is small, a long-time measurement is possible with a small battery. Further, since the semiconductor strain gauge 110, the transmission module 120, and the power supply means 130 such as a battery can be simply mounted on a member to be measured such as the outer link plate C1 or the shaft, the required measurement can be performed, so that the measurement work is also simple. It can be done at low cost. In addition, since it is small and lightweight, the influence on the movement of the chain itself is small, and the operating state of the chain can be measured with high accuracy.

  In the embodiment described above, a discrete configuration is used. However, the transmission module 120, the power supply unit 130, and the power supply monitoring unit 140 may be mounted on a printed wiring board.

  Next, a detailed configuration of the above-described power supply monitoring unit 140 will be described. That is, when the power of the load (semiconductor strain gauge 110 and transmission module 120) of the chain operating state measuring apparatus 100 described above is remotely turned on, and when the output voltage of the power supply means 130 falls below a specified value, the power to the load The configuration and processing operation in the case of suspending will be described with reference to FIGS.

  FIG. 4 is a circuit diagram showing a detailed circuit configuration of the power supply monitoring unit 140.

  In FIG. 4, the power supply monitoring unit 140 supplies power from the power supply unit 130 to the load (semiconductor strain gauge 110 and transmission module 120) in response to the power ON operation of the receiving device (remote operation unit) 150. In this circuit, the power supply from the power supply unit 130 to the load is stopped when the output voltage of the power supply unit 130 (hereinafter referred to as a power supply voltage) falls below a specified value. The power supply monitoring means 140 includes a power-on photoelectric conversion element 141, a thyristor 142, an optical MOS relay 143, a power supply voltage monitoring means 144, and a regulator 145, each of which is a load (semiconductor). The strain gauge 110 and the transmission module 120) and the power supply means 130 are each electrically connected in a connection form as shown in FIG.

  Here, the power-on photoelectric conversion element 141 is a photoelectric conversion element that receives an optical signal and generates an electromotive force. For example, the photoelectric conversion element has a PN junction diode in which the P side is a positive pole and the N side is a negative pole. When light hits the PN junction diode, free electrons and holes are formed in the depletion layer. It has a structure that generates an electromotive force between the terminals. Specifically, when the power-on photoelectric conversion element 141 receives the power-on optical signal emitted from the receiving device (remote operation means) 150, the gate (G) -cathode (K) of the thyristor 142 in the subsequent stage. An electromotive force is generated between them.

  Further, the thyristor 142 (thyristor) is a normally-off type thyristor, and is a self-holding semiconductor switching element that is switched on (that is, energized) by the output voltage of the power-on photoelectric conversion element 141. The thyristor 142 returns to the switch-off state (ie, the non-energized state) when the voltage between the anode (A) and the cathode (K) is not supplied after being energized.

  Further, the optical MOS relay 143 is a normally-on type optical MOS relay, in which an LED mounted on itself is energized by a power supply OFF output of a power supply voltage monitoring means 144 described later, the LED emits light, and the light When the field effect transistor (FET), which is also mounted by itself, is turned off (that is, in a non-energized state), and when the power supply voltage monitoring means 144 is turned off, the LED is not turned on and emits no light. This is a non-self-holding type semiconductor switching element in which the FET returns to ON (that is, energized state).

  In addition, when the thyristor 142 is turned on, the power supply voltage monitoring unit 144 is supplied with power, and monitors the power supply voltage of the power supply unit 130 and a regulator voltage of a regulator 145 described later, so that the power supply voltage becomes lower than the regulator voltage. If an electromotive force is generated, an electromotive force is generated between the terminal voltages of the LEDs of the optical MOS relay 143 to light the LEDs. The power supply voltage monitoring unit 144 can compare the power supply voltage with the regulator voltage, and can be any one that can turn on the LED of the optical MOS relay when the power supply voltage becomes lower than the regulator voltage. For example, as shown in FIG. This is realized by using a simple analog comparator.

  The regulator 145 is a power supply stabilizer that stabilizes the voltage used in the load (the semiconductor strain gauge 110 and the transmission module 120). For example, it is realized by a small voltage rectifying element that has three terminals of input, ground, and output, such as a three-terminal regulator, and outputs the input DC power supply after smoothing and making the voltage constant.

  The receiving device (remote operation means) 150 is a power-on external remote controller that instructs the power supply monitoring means 140 to supply power from the power supply means 130 to the load (semiconductor strain gauge 110 and transmission module 120). As a function. The receiving device (remote control means) 150 includes a power ON light emitting unit 152 and a changeover switch 153.

  Here, the power ON light emitting unit 152 emits a power ON optical signal that instructs the power supply monitoring unit 140 to start power supply (power ON) to the load (the semiconductor strain gauge 110 and the transmission module 120). For example, a light emitting diode (LED) is realized, but other than the light emitting diode (LED) may be used as long as it generates an electromotive force in the power ON photoelectric conversion element 141 of the power supply monitoring means 140. .

  The changeover switch 153 is a switch for the operator to instruct power ON.

  Next, the processing operation of the power supply monitoring unit 140 configured as described above will be described.

  First, the operation when the power is turned on will be described with reference to FIG.

  In the chain operating state measuring apparatus 100, when power is not supplied to the load (semiconductor strain gauge 110 and transmission module 120) (power supply OFF state), the normally-off type thyristor 142 is in the OFF state (that is, non-energized) The power supply monitoring means 140 is not supplied with power, and the power supply monitoring means 140 is in a non-energized state.

  At this time, when a power-on optical signal emitted from the power-on light-emitting unit 152 of the receiving device (remote control means) 150 enters the power-on photoelectric conversion element 141 (a), the power-on photoelectric conversion is performed by photoelectric conversion. A voltage is generated in the element 141. The generated voltage is applied between the gate (G) and the cathode (K) of the thyristor 142 (b).

  When the voltage between the gate (G) and the cathode (K) reaches the ON voltage of the thyristor 142, the thyristor 142 is switched on (that is, energized) (c), and further normally-on type light. By using the MOS relay 143, power supply to the semiconductor strain gauge 110 and the transmission module 120 is started (d). As a result, the semiconductor strain gauge 110 and the transmission module 120 start to operate immediately after power feeding is started (e). That is, the semiconductor strain gauge 110 starts an operation of detecting the operating state of the chain C, and the transmission module 120 starts an operation of wirelessly transmitting the detection output of the semiconductor strain gauge 110. Note that the voltage used in the semiconductor strain gauge 110 and the transmission module 120 is actually stabilized by the regulator 145.

  When the thyristor 142 is switched on, power is supplied to the power supply voltage monitoring means 144 (f), and the power supply voltage of the power supply means 130 and the regulator voltage of the regulator 145 are monitored (g).

  As described above, even in a small device structure, it is possible to turn on the power of the device remotely at a desired timing suitable for the measurement of the operating state of the member to be measured with a small circuit configuration. As well as unnecessary measurement data.

  Next, a processing operation in the case where the power to the semiconductor strain gauge 110 and the transmission module 120 is suspended when the power supply voltage of the power supply unit 130 falls below a specified value will be described with reference to FIG.

  When power is supplied to the loads (semiconductor strain gauge 110 and transmission module 120) (power is turned on) and power is supplied to the power supply voltage monitoring means 144 (f), the power supply voltage monitoring means 144 is connected to the power supply of the power supply means 130. The voltage and the regulator voltage of the regulator 145 are monitored (g).

  Here, when the power supply voltage monitoring unit 144 detects that the power supply voltage has become equal to or lower than the regulator voltage as a result of monitoring the power supply voltage and the regulator voltage (that is, the power of the power supply unit 130 is almost gone), the optical MOS An electromotive force is generated between the LED terminals of the relay 143 (h), and the LED is caused to emit light (i). Then, the FET of the optical MOS relay 143 enters an OFF state (that is, a non-energized state) (j). As a result, energization to the thyristor 142 is stopped, so that the thyristor 142 returns from the switch ON state to the switch OFF state (k). Then, the power supply to the semiconductor strain gauge 110 and the transmission module 120 is suspended (l). As a result, the semiconductor strain gauge 110 stops the detection operation and the transmission module 120 stops the transmission operation (m), so that erroneous measurement data due to the load unit malfunction is transmitted to the reception device (remote operation means) 150. Can be prevented.

  Further, when the thyristor 142 returns to the switch OFF state, the power supply to the power supply voltage monitoring means 144 is stopped (n).

  Further, when the power supply to the power supply voltage monitoring unit 144 is stopped, the electromotive force between the terminals of the LED of the optical MOS relay 143 disappears (o), so that the light emission of the LED stops (p), and the optical MOS relay 143 The FET returns from the switch OFF state to the switch ON state (q). At this time, since the thyristor 142 has already been switched off, power supply to the load is not performed.

  In this way, if an appropriate power supply voltage is no longer applied to the load, it is possible to prevent malfunction by stopping the operation of the load by stopping the supply of power supply voltage. It will come to an end.

  That is, according to the configuration as described above, necessary and correct measurement data can be collected while the supply voltage drops after the power is turned on. Since it is equipped with a mechanism that can turn on the power remotely and the device can be activated remotely when it is desired to start measurement, it can be installed by turning on the power and installing it on the member to be measured as before. There is no need to waste the battery by the amount of time or collect unnecessary measurement data within the installation time. Further, when the power supply voltage becomes equal to or lower than the regulator voltage, the power supply voltage monitoring unit performs the power OFF output operation to stop the voltage supply to the measuring device (load unit), thereby preventing erroneous measurement data collection.

  In the embodiment shown in FIG. 2 described above, the configuration including one power supply means 130 is shown. However, for example, as shown in FIG. 8, two power supply means (button-type batteries) 130a, You may make it the form provided with the electric power feeding means (button type battery) 130b. That is, in the embodiment of FIG. 8, the power supply means 130a is electrically connected to the semiconductor strain gauge 110 via the power supply monitoring means 140a with each wire (wire 105, wire 106), and the power supply means 130b The transmission module 120 is electrically connected with each wire (wire 107, wire 108) via the supply monitoring means 140b. As described above, according to the configuration including two power sources, the power sources are divided, and the degree of freedom of installation is increased.

  In the above-described embodiment, a case has been described in which remote control means for instructing power supply to instruct power supply to the load is incorporated in the receiving device 150 that receives measurement data of the chain operating state measuring device 100. However, the present invention is not limited to such an embodiment, and the receiving apparatus may be provided with only a measurement data receiving function circuit, and remote control means may be provided as a terminal dedicated to power-on separate from such a receiving apparatus.

  According to the configuration described above, the detection means for detecting the operating state of the member to be measured, the output means for outputting the detection value of the detection means to the predetermined portion, the power supply means for supplying power to the detection means and the output means, and the non-energization A photoelectric conversion element that generates an electromotive force by receiving a power-on light signal emitted from the remote control means in a state, and changes from a non-energized state to an energized state according to the electromotive force generated by the photoelectric conversion element, and the detection means and All of the power supply monitoring means including a self-holding type semiconductor switching element that turns on a switch that supplies power from the power supply means to the output means is installed in the member to be measured, and the switch of the self-holding type semiconductor switching element When power is supplied from the power supply means to the detection means and the output means, the measurement including the detection operation of the operating state of the member to be measured and the output operation of the detection value is performed. Since the physical operation is started, it is possible to remotely turn on the device power at a desired timing suitable for measuring the operating state of the member to be measured with a small circuit configuration even in a small device structure. As a result, useless battery consumption can be suppressed, and unnecessary measurement data need not be collected.

  Further, according to the configuration described above, the power supply monitoring means monitors the voltage value of the power supply means when the self-holding semiconductor switching element is switched on and power is supplied from the power supply means, and the monitoring voltage value Power supply voltage monitoring means for outputting a power-off output when the power supply voltage falls below a predetermined value, and detecting means and output by turning off the switch of the self-holding semiconductor switching element in accordance with the power-off output of the power supply voltage monitoring means And a non-self-holding type semiconductor switching element that suspends the power from the power supply means to the device, so that when the power supply voltage of the power supply means falls below a specified value, the power supply to the device is stopped, thereby malfunctioning the device. It is not necessary to collect erroneous measurement data by.

  Further, according to the configuration described above, the detection means is a semiconductor strain gauge fixed to a measured member such as a link plate of a chain, and the output means is fixed to the measured member that wirelessly transmits the output of the semiconductor strain gauge. Since the power supply means is a battery that supplies power to the semiconductor strain gauge and the transmission module, the chain performance can be measured more easily and at low cost. Specifically, a semiconductor strain gauge has a large output, for example, 50 to 100 times that of a strain gauge using a metal resistance wire, and the required measurement can be performed without an amplifier circuit. Thus, the circuit configuration of the transmission module is simplified, and an integrated circuit can be formed at a low cost and a small size. In addition, the power consumption of the transmission module is low, and power can be supplied by a small-capacity power supply means together with the semiconductor strain gauge. Can be manufactured. And since a transmission module becomes small, these can be easily fixed to the link plate of a chain, for example.

Explanatory drawing which shows the structure of one Example of the chain operating state measuring apparatus which concerns on this invention. The expansion perspective view of the chain operation state measuring apparatus shown in FIG. The expanded sectional view which follows the ZZ line of FIG. The block diagram which shows the circuit structure of the receiver shown in FIG. 1, and an electric power supply monitoring means. FIG. 5 is a circuit diagram showing a circuit configuration of power supply voltage monitoring means shown in FIG. 4. The figure which shows the circuit closed state at the time of the power supply ON in the circuit shown in FIG. The figure which shows the circuit open state at the time of the power supply OFF in the circuit shown in FIG. The expansion perspective view which shows the modification of the chain operating state measuring apparatus shown in FIG.

Explanation of symbols

100 ... Chain operating state measuring device (measuring device)
110 ... Semiconductor strain gauge (detection means)
120 ... Transmission module (output means)
121 ... Antenna 130 (130a, 130b) ... Power supply means (small battery)
140 (140a, 140b) ... Power supply monitoring means 141 ... Photoelectric conversion element 142 for power ON ... Thyristor (self-holding semiconductor switching element)
143 ... Optical MOS relay (non-self-holding semiconductor switching element)
144 ... Power supply voltage monitoring means 145 ... Regulator 150 ... Receiving device (remote control means)
151 ... Antennas 101, 102, 103, 104, 105, 106, 107, 108 ... Wire C ... Chain C1 ... Outer link plate C2 ... Inner link plate C3 ... Connection pin S1・ ・ ・ Drive side sprocket S2 ・ ・ ・ Driven side sprocket X ・ ・ ・ Adhesive Y ・ ・ ・ Coating material

Claims (3)

Detection means for detecting the operating state of the member to be measured;
Output means for outputting the detection value of the detection means to a predetermined portion;
Power supply means for supplying power to the detection means and the output means;
A photoelectric conversion element that generates an electromotive force by receiving a power-on light signal emitted from a remote control means in a non-energized state, and enters the energized state from the non-energized state according to the electromotive force generated in the photoelectric conversion element. And a power supply monitoring means comprising a self-holding type semiconductor switching element that turns on a switch that supplies power from the power supply means to the output means and the output means.
When the switch of the self-holding semiconductor switching element is turned on and electric power is supplied from the power supply means to the detection means and the output means, respectively, an operation for detecting an operating state of the member to be measured and an output operation for the detection value A measurement apparatus comprising: starting a measurement processing operation including: The power supply monitoring means includes
When the self-holding semiconductor switching element is switched on and power is supplied from the power supply means, the voltage value of the power supply means is monitored, and the monitored voltage value falls below a predetermined value defined in advance. Power supply voltage monitoring means for outputting a power-off output;
A non-self-holding type semiconductor switching element that switches off the self-holding type semiconductor switching element in response to a power-off output of the power supply voltage monitoring means to suspend power from the power supply means to the detection means and the output means; The measuring apparatus according to claim 1, further comprising:   The detection means is a semiconductor strain gauge fixed to a measured member such as a link plate of a chain, and the output means is an integrated circuit fixed to the measured member that wirelessly transmits the output of the semiconductor strain gauge. The measuring apparatus according to claim 1, wherein the power supply unit is a battery that supplies power to the semiconductor strain gauge and the transmission module.

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