JPH06201311A - Electric power transfer device of position detecting sensor - Google Patents

Abstract

PURPOSE:To provide a device which supplies, in a cordless state, electric power which is required for transferring, in the cordless state an on or off signal from a position detecting sensor to a control device located at a remote location from the position sensor. CONSTITUTION:After converting a commercial power supply 1 into direct current, high frequency current oscillated by an oscillating circuit 4 is applied to the first electromagnetic induction element 5, so tat an electromotive force is induced in second electromagnetic induction element 6 included in a position detecting sensor located at an opposing remote location by magnetic coupling. A signal transfer device 13 is operated so that anon or off signal of the position detecting sensor portion is transferred, in a cordless state, to a remote control device by using the electromotive force as a power supply.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless electric power required to transmit a control signal cordlessly to a control device located at a position distant from the position detection sensor by electrically ON or OFF information from the position detection sensor. Related to the device supplied by.

[0002] Conventionally, it has been general to transmit the electric ON or OFF information sent from the position detection sensor to the control device by wire, but of course, there is a risk of disconnection, and in particular, the position When the mounting surface of the detection sensor is a turret or the like, there is a problem that the cord is twisted. Therefore, a cordless transmission means having a large degree of freedom has recently been put into practical use.

The first method of cordless transmission that has been put into practical use is a method of using dielectric coupling, in which an induction coil to which an alternating current is made to flow from a control device is brought close to an induction coil provided in the position detection sensor main body. Electromotive force is applied to detect a change in the alternating current due to a change in the inductance of the induction coil caused by turning on or off the switch of the position detection sensor, and the amplified current is amplified to control the control device.

As a second method of cordless transmission, an infrared ray projecting portion is provided in the body of the position detecting sensor,
By converting the ON or OFF signal output from the position detection sensor into a current, inputting it into the light projecting section and sending out an optical signal, light is received by a light receiver provided at a distant distance,
It is a method of converting the current signal again, amplifying it, and sending a control current to the control device.

As a third method of cordless transmission, ON or OF output from a position detection sensor is used.
For example, the F signal is converted into an FM-modulated radio wave, and the radio wave is emitted from a transmission antenna provided in the position detection sensor main body to be received by a reception antenna provided at a distance, and the radio wave is detected and amplified. This is a method of sending a control current to the control device.

[0006]

The above-mentioned first method of cordless transmission has an advantage that a power source is not required on the position detecting sensor main body side, but the position detecting sensor main body side induction coil and the control device side are provided. The gap between the induction coil and the induction coil is extremely narrow and can be only about 1 mm, and when chips of a magnetic material such as iron clog the gap between the opposing induction coils, the permittivity changes, causing abnormalities in conduction operation. There is a problem.

In order to transmit the control signal cordlessly over a distant distance without the above-mentioned problems, the second,
According to the third method, the second method requires a power source for causing the infrared projector to emit light, and the third method requires a power source for emitting radio waves. For this reason, in the second and third methods, in order to supply electric power without using a cord as a power source, it is necessary to incorporate a battery in the position detection sensor. There was an issue that the replacement work was extremely troublesome for the user.

[0008]

In order to achieve the above object, the power transmission device of the position detecting device of the present invention is connected to a high frequency AC power source at a position separated from the outside of the housing of the position detecting sensor. One electromagnetic induction element, the housing portion is provided with a second electromagnetic induction element at a position facing the first electromagnetic induction element, the first electromagnetic induction element from the second electromagnetic induction element It is characterized in that it is used as a power source of means for inducing electromotive force and transmitting the opening / closing information of the position detection sensor to the outside of the housing.

Further, a first electromagnetic induction element connected to a high frequency AC power source is provided at a position separated from the outside of the housing of the position detection sensor, and a second electromagnetic induction element is provided at a position facing the first electromagnetic induction element in the housing portion. By providing the electromagnetic induction element of
The first electromagnetic induction means induces an electromotive force in the second electromagnetic induction means to charge a rechargeable battery as a power source of the means for transmitting the opening / closing information of the position detection sensor to the outside of the housing. It was done.

The second electromagnetic dielectric element is provided on the mounting surface side of the housing.

The second electromagnetic induction element is also used as an antenna for transmitting the opening / closing information of the position detecting sensor as a radio wave, and the first electromagnetic induction element is also used as an antenna for receiving the radio wave. Is.

[0012]

[Function] After the commercial power supply is turned to direct current, the high-frequency current oscillated by the oscillation circuit is applied to the first electromagnetic induction element, and the second electromagnetic induction built in the position detection sensor at a position facing and away from the first electromagnetic induction element. An electromotive force is induced in the element by magnetic coupling.
Using this electromotive force as a power source, a signal transmission device that cordlessly transmits the ON or OFF signal of the position detection sensor unit to a remote control device is operated.

[0013]

EXAMPLES Examples will be described with reference to the drawings.
In the configuration diagram shown in FIG. 1, (b) shows the configuration of the power supply unit, 1 is a commercial power source, 2 is a first rectifying circuit, 3 is a first smoothing circuit, 4 is an oscillating circuit, 5 is a first electromagnetic circuit. (A) shows the configuration of the position detection sensor unit, 6 is a second electromagnetic induction element, 7 is a second rectifier circuit, 8 is a second smoothing circuit, 9 is a constant voltage circuit, 10 Is an actuator of a position detection sensor, 11 is a movable contact, 12 is a fixed contact, and 13 is a signal transmission device.

Next, the operation of FIG. 1 will be described. Commercial power source 1
Is rectified by the first rectifying circuit 2 and further the first smoothing circuit 3
Is smoothed to be a direct current and supplied to the oscillation circuit 4. The oscillator circuit 4 generates a high frequency alternating current of, for example, several tens KHz to several hundreds KHz, and the high frequency alternating current is the first electromagnetic induction element 5, that is, ferrite as shown in the front sectional view of FIG. First core 21 made of rod-shaped magnetic material
It is applied to both ends of the first coil 22 having a wire wound around it.

A second coil having a conductor wound around a second core 23 made of a rod-shaped magnetic material such as ferrite at a position separated from the first inductive element 5 by a distance L, like the first electromagnetic inductive element 5. The second electromagnetic induction elements 6 made of 24 are opposed to each other with a distance L. The first electromagnetic induction element 5 and the second electromagnetic induction element 6 are separated from each other but are magnetically coupled to each other, and are connected to the first coil 21 of the first electromagnetic induction element 5 by the principle of electromagnetic induction. An alternating electromotive force is induced in the second coil 24 of the second electromagnetic induction element 6 by the flowing alternating current.

As described above, since the first electromagnetic induction element 5 and the second electromagnetic induction element 6 are applied with high frequency alternating current by using a magnetic material such as ferrite having good high frequency characteristics, normal commercial Electromagnetic induction efficiency is much higher than AC,
The air gap L can be large (for example, several cm).

The AC electromotive force induced in the second coil 24 is rectified by the second rectifier circuit 7 and smoothed by the second smoothing circuit 8 to become DC. Reference numeral 9 denotes a constant voltage circuit, which can maintain a constant voltage even when the air gap L between the first electromagnetic dielectric element 5 and the second electromagnetic dielectric element 6 slightly changes.

Numeral 10 is an actuator, which is provided by displacing a work or a table (not shown) to the right on the paper surface.
Both of them are displaced to the right and a voltage is applied from the constant voltage circuit 9 to the signal transmission device 13 at the moment when the movable contact 11 comes into contact with the fixed contact 12 (described in detail in the description of FIG. 3), for example, infrared light. Alternatively, a radio wave is emitted and received by a light receiver or an antenna at a remote position, and an ON signal is sent to the control signal generator.

FIG. 2A shows the first core 2 as described above.
This is an example in which rod-shaped magnetic bodies such as ferrite are used as the first and second cores 23, and FIG. 2B shows the first core 2
5 and an example in which an E-shaped magnetic material such as ferrite is used as the second core 27. In addition to the above-mentioned rod-shaped or E-shaped, a pot-shaped,]-shaped core can naturally be used.

FIG. 3 is a front sectional view of an embodiment in which the structure shown in FIGS. 1 and 2 is incorporated as an apparatus.
Is a position detection sensor unit, 31 is a housing, and 32 is a probe, which are slidably supported by a bearing 33 fixed to the housing 31. A switch body 34 is fixed to the housing 31. The lid 35 is provided with a fixed contact 12, and the movable contact 1 facing the fixed contact 12 is provided in the center thereof.
1 forms a bearing of an actuator 10 having a T-shaped cross section. 36 is an operating plate fixed to the right end of the probe 32, and 37 is a strong compression spring. By pressing the operating plate 36, the probe 32 is always pushed to the left, and the actuator 10 is also pushed, so that the switch spring The movable contact 11 of the switch is separated from the fixed contact 12 against the weak spring 38. Reference numeral 39 is a rotation stop pin of the operating plate 36 planted in the housing 31.

Reference numeral 40 denotes a printed circuit board a to which the circuit components of the second rectifier circuit 7 to the constant voltage circuit 9 of FIG. 1 are attached, which is fixed to the housing 31 by screws or the like not shown in the drawing, and the circuit board a40 has a second circuit. The electromagnetic induction element 6 is attached.

A screw is provided at the right end of the housing 31, and the nut 31 is mounted on the mounting surface 42 of an NC machine such as a lathe, a machining center, or a dedicated machine by a nut 41. Reference numeral 43 denotes a cover a made of a substance that passes a magnetic force, for example, a material such as plastic, and is attached to the housing 31 so as to keep airtightness.

FIG. 3 (b) is a front sectional view of the power supplying section, in which 44 is a power supplying section main body, 45 is a printed circuit board b fixed to the power supplying section main body 44, and the printed circuit board b45 is the same as that of FIG. The circuit components of the one rectifier circuit 2 or the oscillator circuit 4 and the first electromagnetic induction element 5 are attached. Reference numeral 46 denotes a cover b made of a substance that allows passage of magnetism, for example, a material such as plastic, and is attached to the power supply unit main body 44 so as to maintain airtightness. Reference numeral 47 is a power cable. The operation is the same as the description of FIG. 1 and FIG.

FIG. 4 is a block diagram of another embodiment, which differs from FIG. 1 in that the output of the second smoothing circuit 8 is charged into a rechargeable battery 49 via a constant current resistor 48. Is different. That is, if the commercial power supply 1 is supplied and the first electromagnetic induction element 5 faces the second electromagnetic induction element 6,
The charging battery 47 is constantly charged. It is suitable when the first electromagnetic induction element 5 and the second electromagnetic induction element 6 are facing each other for a long time, the signal transmission device 13 has a short energization time, and the power consumption is larger than the electromagnetic induction power. .

FIG. 5 is a block diagram of yet another embodiment, showing a configuration in which the invention described in FIG. 1 is added to the invention of Japanese Patent Application No. 4-329830 filed by the present applicant. 1 and 2, only 51 is a trimmer capacitor, 52 is an oscillating transistor, and 53 is a crystal oscillator, for example, 40 MHz is used. 54 is a resistor, 55 is a capacitor, and 56 is a transmitting antenna wound on the second coil 24 for several turns.

Reference numeral 57 is a receiving antenna wound on the first coil 22 for several turns, 58 is a super-regenerative detecting circuit, 59 is a low frequency amplifying circuit, 60 is a rectifying circuit, 61 is a direct current amplifying circuit, and 62.
Is a switching circuit, 63 is a control circuit, and 64 is a motor.

The operation will be briefly described below with reference to FIG.
At the moment when the movable contact 11 comes into contact with the fixed contact 12 when the workpiece 10 and the table (not shown) move, the actuator 10 is displaced to the right on the paper surface, and
Also, as described in detail in the description of FIG. 2, a current flows through the oscillation circuits (51 to 55) as a signal transmission device, and radio waves are emitted from the transmission antenna 56.

The radio wave emitted from the transmitting antenna 56 is received by the receiving antenna 57 of the power supply / control section shown in FIG. The antenna output is detected by the super reproduction detection circuit 58, low-frequency amplified by the low-frequency amplification circuit 59, rectified by the rectification circuit 60, DC-amplified by the DC amplification circuit 61, and then the control circuit 63 is driven by the switching circuit 62. A sufficient current is output to the control circuit 63, and the control circuit 63 can detect dimensions, perform positioning, and the like by stopping the power supply of the motor 64 for driving the work or the table and stopping the work and the table by applying a brake.

Since the voltage supplied to the oscillation circuit according to this embodiment is 3 V and the current consumption is about 4 mA, the induction power between the first electromagnetic induction element 5 and the second electromagnetic induction element 6 can be used. This is suitable when the position detection sensor is a turret and the first electromagnetic induction element 5 and the second electromagnetic induction element 6 face each other only when the position is detected.

6 and 7 show an application example of the present invention. FIG. 6 shows a position detection sensor as an ON signal by the electric power electromagnetically induced by the first electromagnetic induction element 5 and the second electromagnetic induction element 6. The infrared light emitting element 66 outside the unit 65 is caused to emit light, and the light is transmitted to the light receiver 67 which is away from the unit 65 to control the control unit.
In FIG. 7, an ON signal is generated by electric power electromagnetically induced by the first electromagnetic induction element 5 and the second electromagnetic induction element 6, and an FM wave modulated by an antenna 76 outside the housing 75 of the position detection sensor unit is emitted. , Remote receiving antenna 7
7 to control the control unit.

Although it has been described above that the switch is a normally open contact and sends an ON signal as a detection signal, it is of course possible that the switch is a normally closed contact and sends an OFF signal. In that case, the signal transmission device in the position detection sensor always consumes electric power, so if electromagnetic induction power is not constantly supplied or if the power consumption of the position detection sensor unit exceeds the electromagnetic induction power, switching to the sensor unit is performed. It is necessary to provide a circuit and the like to turn on the power only before and after the switch sends an ON signal.

[0032]

Since the present invention is constructed as described above, it has the following effects.

No battery is required for the position detection sensor section.
Alternatively, since the power can be supplied to the signal transmission device while charging the rechargeable battery cordlessly, the user does not need to detect the battery life and replace it.

Since a high frequency current is applied to the electromagnetic induction element, metal cutting powder does not adhere to the electromagnetic induction element as in the case of direct current or low frequency alternating current.

Since the electromagnetic induction element is provided on the mounting portion side of the position detecting sensor, the back side of the machining side such as a lathe and a machining center is used, so that the power supply section does not interfere with the machining.

Since the second electromagnetic induction element also serves as the transmitting antenna and the first electromagnetic induction element also serves as the receiving antenna, the number of parts is reduced and space is saved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a present embodiment.

FIG. 2 is a front sectional view of an electromagnetic induction element.

FIG. 3 is a front cross-sectional view when the configuration of FIGS. 1 and 2 is incorporated as an apparatus.

FIG. 4 is a configuration diagram of another embodiment.

FIG. 5 is a configuration diagram of yet another embodiment.

FIG. 6 is a front view of an application example.

FIG. 7 is a front view of another application example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Commercial power source 4 Oscillation circuit 5 First electromagnetic induction element 6 Second electromagnetic induction element 10 Actuator 11 Moving contact 12 Fixed contact 13 Signal transmission device 21 First core 22 First coil 23 Second core 24 Second Coil 31 housing 32 measuring element 49 rechargeable battery 56 transmitting antenna 57 receiving antenna

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[Procedure amendment]

[Submission date] November 8, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

A second coil having a conductor wound around a second core 23 made of a rod-shaped magnetic material such as ferrite at a position separated from the first inductive element 5 by a distance L, like the first electromagnetic inductive element 5. The second electromagnetic induction element 6 composed of 24 faces each other.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

FIG. 4 is a block diagram of another embodiment, which is different from FIG. 1 in that the output of the second smoothing circuit 8 is charged into a rechargeable battery 49 which can be charged through a constant current resistor 48. The points are different. That it is supplied commercial power source 1, and the first electromagnetic inductive element 5 if facing the second electromagnetic inductive element 6, and is configured to charge the charge at all times the battery 4 9. This is suitable when the first electromagnetic induction element 5 and the second electromagnetic induction element 6 face each other for a long time, the signal transmission device 13 has a short energization time, and the power consumption is larger than the electromagnetic induction power. .

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

The radio wave emitted from the transmission antenna 56 is received by the reception antenna 57 of the power supply / control unit, which is opposed to the radio wave shown in FIG. 5 (b). The antenna output is detected by the super reproduction detection circuit 58, low-frequency amplified by the low-frequency amplification circuit 59, rectified by the rectification circuit 60, DC-amplified by the DC amplification circuit 61, and then the control circuit 63 is driven by the switching circuit 62. A sufficient current is output to the control circuit 63, and the control circuit 63 can detect dimensions, perform positioning, and the like by stopping the power supply of the motor 64 for driving the work or the table and stopping the work and the table by applying a brake.

Claims (4)

[Claims] 1. A first electromagnetic induction element connected to a high-frequency AC power source at a position separated from the outside of the housing of the position detection sensor, and a first electromagnetic induction element at a position facing the first electromagnetic induction compositor in the housing section. A second electromagnetic induction element is provided, and an electromotive force is induced in the second electromagnetic induction element from the first electromagnetic induction element, and is used as a power source of means for transmitting the opening / closing information of the position detection sensor to the outside of the housing. A power transmission device for a position detection sensor characterized by the above. 2. A first electromagnetic induction element connected to a high frequency AC power source at a position spaced from the outside of the housing of the position detection sensor, and a second electromagnetic induction element at a position facing the first electromagnetic induction element in the housing portion. Of the first electromagnetic induction means to induce an electromotive force in the second electromagnetic induction means, and charging as a power source of means for transmitting the opening / closing information of the position detection sensor to the outside of the housing. A power transmission device for a position detection sensor, characterized by charging a battery. 3. The power transmission device for a position detection sensor according to claim 1, wherein the second electromagnetic dielectric accumulator is provided on the mounting surface side of the housing. 4. The second electromagnetic induction element is also used as an antenna for transmitting the opening / closing information of the position detection sensor as a radio wave, and the first electromagnetic induction element is also used as an antenna for receiving the radio wave. The power transmission device of the position detection sensor according to claim 1.