JP5180737B2 - Position detecting apparatus and controller used therefor - Google Patents

Description

  The present invention relates to a position detection technique for detecting the position of a moving member such as a piston driven by a fluid pressure cylinder using liquid pressure or air pressure as a working medium.

  The fluid pressure cylinder has a cylinder tube in which a piston is incorporated and a piston rod that protrudes outside and is attached to the piston. By supplying a fluid such as compressed air, that is, a working medium, into the cylinder tube, the piston rod is linearly driven. The The rotary actuator has a housing with a swing shaft protruding outside, and a vane and a rack piston incorporated in the housing. By supplying fluid into the housing, the swing shaft is connected via the vane and the rack piston. Driven.

  As described above, a position detecting device is used to automatically detect the position of a moving member such as a piston incorporated in various actuators such as a cylinder tube and a rotary actuator. As described in Patent Document 1, the position detection device has a sensor head or a sensor block in which a magnetic sensor or MR sensor (magnetoresistance element) that is sensitive to the magnetic force of a magnet attached to a moving member is incorporated. The sensor head is attached to an actuator body such as a cylinder tube or a housing, and a detection signal is sent from the sensor head to the controller.

  Since the resistance value of the magnetic sensor incorporated in the sensor head changes according to the strength of the magnetic field of the magnet, the magnetic sensor outputs an analog signal corresponding to the position of the magnet attached to the moving member. Therefore, when the magnet moves together with the moving member and the magnet moves to a predetermined detection stroke range in which the magnetic sensor is sensitive to the magnetic force, the magnetic sensor detects that the moving member is within the detection stroke range. Can do. Furthermore, the position of the moving member can be detected based on the output signal from the magnetic sensor.

When the magnet is located within the detection stroke range that is sensitive to magnetic force, a light-emitting diode, that is, an LED provided in the sensor head is turned on by a signal processing circuit incorporated in the sensor head.
JP-A-8-334305

  When the controller determines that the moving member has reached a set position within the range of the detection stroke based on the output signal from the magnetic sensor, the controller outputs a signal to an external host computer or the like. By providing the controller with a display unit that displays the position of the moving member by a numerical value or the like based on an output signal from the magnetic sensor, the position information of the moving member with respect to the sensor head can be numerically displayed on the controller.

  On the other hand, the LED provided in the sensor head is lit by a signal processing circuit incorporated in the sensor head when the moving member reaches the detection stroke range.

  A sensor head equipped with a magnetic sensor, for example, in a cylinder tube incorporating a piston that reciprocates linearly with a fluid, the position of the piston with magnet is the position of the reciprocating end, or the intermediate position of the reciprocating end. It is attached to the cylinder tube to detect that. Since the position of the magnet-attached piston cannot be visually confirmed directly from the outside, an operator can attach the sensor head to an arbitrary position of the sensor mounting groove formed in the cylinder tube along the moving direction of the piston. The conventional procedure is as follows.

  First, in order to set the position of the piston to be detected by the magnetic sensor, the protruding length of the piston rod from the cylinder tube is set. The sensor head is inserted into the sensor mounting groove of the cylinder tube and the sensor head is moved manually along the sensor mounting groove under the state where the piston rod has the set protruding length. When the sensor head approaches the magnet of the piston, the position information of the magnet with respect to the sensor head is numerically displayed on the display unit of the controller, so the position where the sensor head is to be attached is determined according to the position information displayed on the display unit. . When the mounting position is determined, the sensor head is fixed at a predetermined position by fastening a mounting screw provided on the sensor head.

  The detection stroke of the magnetic sensor is, for example, about 5 mm, and the operator recognizes that the magnet is within the detection stroke range with respect to the magnetic sensor by turning on the LED provided on the sensor head. However, it is not possible to determine which position within the detection stroke range is the sensor head mounting and fixing position by lighting the LED provided on the sensor head, and observe the position information on the numerical display section of the controller. There must be.

  For this reason, in order to find the optimum mounting position of the sensor head to the cylinder tube, the position of the detection stroke in which the magnetic sensor is sensitive to the magnetic force is indicated numerically on the numerical display section of the controller. This is performed while visually observing the position information. For example, when the display unit displays the range of the detection stroke of the magnetic sensor as a percentage, and when the display reaches a position around 50% as the optimum position, the sensor head is moved along the sensor mounting groove. When the value of the display unit becomes a value around 50%, the sensor head is fixed with the mounting screw.

  In this way, the sensor head mounting position is set while visually observing the display and output of the controller. Therefore, to secure the sensor head to the optimal position with the mounting screw, a controller must be provided near the operator. Need to be. However, when the fluid cylinder provided in the production line for industrial products is attached to a complicated and large production apparatus, the fluid cylinder is often arranged away from the controller. For this reason, in order to find the optimum mounting position of the sensor head with respect to the fluid cylinder, in order to visually observe the display section of the controller near the fluid cylinder, the controller is removed from the original mounting position and the wiring is extended to extend the fluid cylinder It is necessary to move to the mounting position. Such work is cumbersome and difficult.

  There is also a method in which one worker visually observes the display part of the controller, and the other worker adjusts and moves the position of the sensor head, and the two talk to each other to find the optimum mounting position of the sensor head. Such work is also cumbersome and difficult.

  An object of the present invention is to make it possible to easily perform an attaching operation of a sensor head to an actuator.

The position detection device of the present invention is a position detection device that detects the position of a moving member with a magnet that is movably incorporated inside an actuator body, on the outside of the actuator body, in response to the magnetic force of the magnet. A magnetic sensor that outputs an output signal and an LED that lights according to the position of the moving member are provided , a sensor head mounted on the actuator body, and a detection stroke range in which the magnetic sensor is sensitive to the magnetic force of the magnet And a lighting range input unit for inputting a lighting position for lighting the LED, and connected to the sensor head via a cable, and controls lighting and extinguishing of the LED based on the output signal output from the magnetic sensor. and a controller for the controller, on the basis of the said output signal magnet A calculation unit that calculates position information, a lighting position setting unit that sets a lighting position of the LED input by the lighting range input unit, a display unit that displays the position information, and the position information from the calculation unit And a comparator for outputting a lighting signal to the LED when the lighting position is at the lighting position .

In the position detection apparatus of the present invention, the lighting range input unit is based on the first and second positions where the moving member is displaced in the moving direction in the detection stroke range in which the magnetic sensor is sensitive to the magnetic force of the magnet. The determined lighting range of the LED is input, the lighting position setting unit sets the input lighting range of the LED, and the comparison unit is configured when the position information from the calculation unit becomes the lighting range. A lighting signal is output to the LED.

The position detection device of the present invention is a position detection device that detects the position of a moving member with a magnet that is movably incorporated inside an actuator body, on the outside of the actuator body, in response to the magnetic force of the magnet. A magnetic sensor that outputs an output signal and an LED that lights according to the position of the moving member are provided , a sensor head that is mounted on the actuator body, and a detection stroke range in which the magnetic sensor is sensitive to the magnetic force of the magnet The moving member is connected to the sensor head via a cable , a lighting range input unit for inputting a lighting range of the LED determined by the first and second positions shifted in the moving direction, and the magnetic sensor A controller for controlling the turning on and off of the LED based on the output signal output from The controller includes a calculator for calculating the position information of the magnet on the basis of the output signal, the turn-on position setting unit for setting a lighting range inputted by the lighting range input section, a display section for displaying the position information And a comparison unit that outputs a lighting signal to the LED when the position information from the calculation unit reaches the lighting range.

The controller of the present invention is provided with a magnetic sensor sensitive to the magnetic force of a magnet of a moving member incorporated movably inside the actuator body and an LED that lights up according to the position of the moving member , A controller connected to a sensor head mounted on the actuator body via a cable and outputting a control signal to the outside based on an output signal from the magnetic sensor, based on the output signal output from the magnetic sensor And a lighting position input by a lighting range input unit for inputting a lighting position for lighting the LED in a detection stroke range in which the magnetic sensor is sensitive to the magnetic force of the magnet. A lighting position setting section for setting the position, a display section for displaying the position information, and the display The position information from the parts are characterized by having a comparison unit for outputting a lighting signal to the LED when a said turn-on position. In the controller of the present invention, the lighting range input unit is determined by the first and second positions where the moving member is displaced in the moving direction within a detection stroke range in which the magnetic sensor is sensitive to the magnetic force of the magnet. The lighting range of the LED is input, the lighting position setting unit sets the input lighting range of the LED, and the comparison unit sets the LED when the position information from the calculation unit becomes the lighting range. A lighting signal is output.

  In the present invention, the position of the moving member with magnet incorporated in the actuator body is detected by the magnetic sensor of the sensor head provided outside the actuator body, and the LED provided in the sensor head is turned on. And turning off are controlled by a signal from a controller arranged away from the sensor head. As a result, when attaching the sensor head to the actuator body, the operator can easily determine the optimum mounting position of the sensor head by visually observing the LED provided on the sensor head. It can be done easily.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an actuator equipped with a position detection device according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line 2-2 in FIG.

  The actuator 10 shown in FIG. 1 is a pneumatic cylinder and has a cylinder tube 11. The cylinder tube 11 has a substantially rectangular outer peripheral surface, and a cylinder hole 12 is formed through the inside in the longitudinal direction. A head cover 13 is attached to one end of the cylinder tube 11 and a rod cover 14 is attached to the other end. In the cylinder hole 12 closed by the head cover 13 and the rod cover 14, a piston 15 is incorporated as a moving member so as to be capable of reciprocating in the axial direction, and a piston rod 16 is attached to the piston 15. The piston rod 16 passes through a through hole formed in the rod cover 14 and protrudes to the outside.

  The cylinder hole 12 is partitioned into two pressure chambers 17a and 17b by the piston 15, and the cylinder tube 11 has a supply / discharge port 18a communicating with one pressure chamber 17a and a supply / discharge port communicating with the other pressure chamber 17b. A port 18a is formed. When compressed air is supplied from one supply / discharge port 18a to the pressure chamber 17a, the piston 15 moves forward in the left direction in FIG. 2, and when compressed air is supplied from the other supply / discharge port 18b to the pressure chamber 17b, the piston 15 is reversed. Move backward in the direction.

  The piston 15 is provided with a magnet 19, and the cylinder tube 11 is formed with a sensor mounting groove 21 to which the sensor head 20 is mounted extending in the longitudinal direction. As shown in FIG. 1, two sensor mounting grooves 21 are formed on each of four outer surfaces of the cylinder tube 11, and a total of eight sensor mounting grooves 21 are formed on the cylinder tube 11. The sensor head 20 can be mounted in any of the plurality of sensor mounting grooves 21. The sensor mounting groove 21 has an opening 21 a that opens to the outside of the cylinder tube 11 and a storage portion 21 b that is wider than the opening 21 a.

  FIG. 3 is an enlarged perspective view of the sensor head 20, and the sensor head 20 has a resin case body 22 having a cross-sectional shape corresponding to the cross-sectional shape of the sensor mounting groove 21. The sensor head 20 is fixed to the sensor mounting groove 21 at an arbitrary position in the longitudinal direction by a screw 23. The case body 22 includes a magnetic sensor 24 and a light emitting diode, that is, an LED 25. The sensor head 20 is connected to a plug 27 via a cable 26 as shown in FIG.

  The plug 27 is detachably connected to a controller case 31 of the controller 30, and a plug 33 to which a power supply cable 32 and an output signal cable 32 are connected is detachably connected to the controller case 31. It is like that. The controller case 31 has a base case body 34 and a display part case body 35 attached to the base case body 34.

  4A is a schematic diagram showing an example of the element configuration of the magnetic sensor 24, and FIG. 4B is an equivalent circuit diagram of the magnetic sensor 24 shown in FIG. 4A.

  As shown in FIG. 4A, the magnetic sensor 24 has eight magnetoresistive elements 1 to 8 formed on the substrate, and the magnetoresistive elements 1 to 8 extend in parallel to the substrate. The magnetoresistive elements that are continuous and adjacent to each other are inclined by 45 degrees. As shown in FIG. 4B, the eight magnetoresistive elements 1 to 8 form two sets of full bridge circuits, and the magnetic sensor 24 is a double full bridge type. A magnetoresistive element bridge circuit A (24a) and a magnetoresistive element bridge circuit B (24b) are formed.

  The sensor head 20 is attached to the central portion in the axial direction of the cylinder tube 11 in the case shown in FIGS. When the piston 15 as the moving member is within the detection stroke S of the magnetic sensor 24, the magnetic sensor 24 responds to the magnetic force of the magnet 19 and outputs an output signal corresponding to the position. Since the magnetic sensor 24 is a double full bridge type, the two magnetoresistive element bridge circuits 24a and 24b output an output signal having a phase difference of 90 degrees with respect to the axial direction of the magnet 19. To do. Thus, the position of the magnet 19 in the detection stroke S can be obtained by calculation based on the output signals from the two magnetoresistive element bridge circuits 24a and 24b having a phase difference.

  FIG. 5 is a block diagram showing a control circuit in the sensor head 20 and the controller 30 shown in FIG. The controller 30 has an arithmetic unit 41 to which output signals from the magnetoresistive element bridge circuits 24a and 24b are amplified and input by amplifiers 36a and 36b. The calculation unit 41 calculates a position information signal of the magnet 19 based on output signals from the two magnetoresistive element bridge circuits 24 a and 24 b of the magnetic sensor 24. The position information signal is output as a voltage signal that changes linearly when the magnet 19 reaches one end of the detection stroke S and then moves toward the other end.

  In order to display the position of the magnet 19 relative to the magnetic sensor 24 in the detection stroke S based on this position information signal, a numerical value display 42 is provided in front of the display unit case body 35 of the controller 30 as shown in FIG. ing. The display format in the numerical value display section 42 can be displayed with an arbitrary scale or ratio. For example, when the magnet 19 reaches one end of the detection stroke S, the numerical value 0 is displayed, and when the magnet 19 reaches the other end, 100 is displayed. The numerical value “0 to 100” indicates the detection stroke S. The range is displayed on a scale divided into 100 equal parts. In this case, if the detected stroke S is 5 mm, it is displayed on the numerical value display unit 42 on a scale of 0.05 mm. When the range of the detection stroke S is divided into 500 equal parts by numerical values of 0 to 500, they are displayed on the numerical value display unit 42 on a scale of 0.01 mm. The position information signal obtained by the calculation unit 41 is scaled by the scaling unit 43 and displayed on the numerical value display unit 42 with a set scale.

  When the magnet 19 reaches any position in the range of the detection stroke S, the LED 25 of the sensor head 20 is turned on from the controller 30. For example, when the numerical display unit 42 displays the range of the detection stroke S of 5 mm with a numerical value of “0 to 500” and the LED 25 is turned on when the magnet 19 moves to the middle position of the detection stroke S, the numerical value is displayed. The LED 25 is turned on when a numerical value of 250 is displayed on the display unit 42, and the LED 25 is turned off at other times.

  If a range is provided at a position where the LED 25 is lit, the LED 25 is lit when the piston 15 as the moving member is between two positions shifted in the moving direction. Thereby, for example, when the LED 25 is turned on when the piston 15 is in the intermediate position, the lighting range is between the two positions. When the lighting range is provided, for example, the LED 25 is turned on when a numerical value from “245” to “255” is displayed on the numerical value display unit 42. The LED 25 is turned on when it is within the range of 1 mm.

  In order to turn on the LED 25 when the magnet 19 reaches the predetermined lighting range in the detection stroke S, as shown in FIG. 1, the up key 44, A down key 45 and a mode key 46 are provided. These keys 44 to 46 constitute a lighting range input unit. In order to input a lighting range for lighting the LED 25, a mode for operating the mode key 46 to set an upper limit value of the lighting range among the range setting modes. Select. In this state, when the up key 44 or the down key 45 is operated to display the upper limit value, for example, the numerical value “255” in the case described above, is displayed on the numerical value display unit 42 and the mode key 46 is operated, A value is entered. Similarly, for example, when the mode key 46 is operated in a state where the numerical value “245” is displayed on the numerical value display unit 42 by operating the up key 44 or the down key 45 as the lower limit value, the lower limit value is input. Is done. Each input value is stored in a memory (not shown) in the controller 30.

  The controller 30 is provided with a setting unit 47 for setting the lighting range of the LED 25 determined by the upper limit value and the lower limit value input by each key operation. As illustrated in FIG. 5, the controller 30 includes a comparison unit 48 that compares the position information signal output from the scaling unit 43 and the lighting range signal output from the setting unit 47. When the position information signal from the computing unit 41 is within the lighting range, a lighting signal is sent to the LED drive circuit 49 of the controller 30, and the LED 25 is driven and lit by the controller 30. Thus, the LED 25 is controlled to be turned on and off by the drive signal sent from the controller 30 to the sensor head 20 via the cable 26.

  When a lighting signal is sent from the comparison unit 48 to the LED 25, a lighting signal is also sent to the LED of the on / off display unit 51 at the same time, and the on / off display unit 51 has a key as shown in FIG. 44 to 46 and the numerical value display part 42 are provided. Four sensor heads 20 are connected to the plug 27 shown in FIG. 1, and the controller 30 is provided with four on / off display portions 51 corresponding to the four sensor heads 20. In FIG. 1, the four on / off display portions 51 are respectively denoted by symbols “a” to “d” corresponding to the four sensor heads 20. Therefore, when the on / off display portion 51a is turned on based on the output signal from the magnetic sensor 24 of the sensor head 20 shown in FIG. 1, when the piston 15 shown in FIG. The part 51a is lit. Position information of the piston 15 corresponding to the sensor head 20 whose on / off display portion 51a is lit is displayed on the numerical value display portion.

  From the scaling unit 43, a position information signal from the magnetic sensor 24 is sent through a signal line 52 to an external control device such as an external host computer or main computer. Similarly, an ON / OFF output signal is sent from the comparison unit 48 to the external control device via the driver 53. For example, when the piston 15 is in a predetermined position, the compressed air is supplied to the pneumatic cylinder. When the supply is stopped, a drive signal is sent from the driver 53 to the electromagnetic valve (not shown) that opens and closes the pneumatic flow path through the signal line 54.

  As described above, since the controller 30 is connected to the sensor head 20 by the cable 26 and is disposed at a position away from the sensor head 20, the position information of the piston 15 based on the output signal from the magnetic sensor 24. Is displayed on the controller 30 at a position distant from the sensor head 20. Therefore, when the sensor head 20 is attached to the cylinder tube 11, the numerical value displayed on the numerical value display unit 42 is visually observed while shifting the sensor head 20 in the longitudinal direction of the cylinder tube 11 as in the past. In order to set the mounting position, the controller 30 needs to be moved to the vicinity of the cylinder tube 11, or when the controller 30 is not moved, it is necessary to perform the mounting work by two operators on the controller 30 side and the cylinder tube side. There is, and the installation work is difficult.

  On the other hand, in the position detection device of the present invention, the LED 25 is turned on by a signal from the controller 30 when the relative position between the magnetic sensor 24 and the magnet 19 is within the lighting range input by the key operation. Therefore, if the LED 25 of the sensor head 20 is visually observed, the operator can determine that the sensor head 20 is in an appropriate position. Thereby, the attachment operation | work with respect to the cylinder tube 11 of the sensor head 20 can be performed easily. That is, for example, when the magnetic sensor 24 detects that the piston 15 has reached a predetermined intermediate position, the piston rod 16 is first protruded by a predetermined length. Under this state, when the operator moves the sensor head 20 along the longitudinal direction of the cylinder tube 11, the magnetic sensor 24 moves to a predetermined lighting range with respect to the magnet 19 of the piston 15. become. When the sensor head 20 arrives within the lighting range, the LED 25 is turned on by a signal from the controller 30, so that the numerical value of the numerical value display unit 42 is visually observed or in cooperation with other workers who observe the numerical value display unit 42. The sensor head 20 can be easily fixed at the optimum mounting position without performing work.

  For example, as described above, when the lighting range is set for the LED 25 so that the LED 25 is turned on when the numerical value display unit 42 displays a value from “245” to “255”, the sensor head 20 is turned on. When the range is reached, the LED 25 provided on the sensor head 20 is turned on. Therefore, without observing the numerical display 42, the sensor head 20 is moved to observe the lighting of the LED 25, so that the optimum mounting position can be operated. The person can discriminate and can fix the sensor head 20 at the optimum position.

  When the lighting range is provided as described above, when the operator moves the sensor head 20, the lighting range of the LED 25 is maintained even if the sensor head 20 is slightly displaced. It becomes. In other words, as described above, when displaying with a numerical value of 0 to 500, if the lighting position is displayed at one point, the sensor head 20 is switched from lighting to extinguishing when the sensor head 20 moves by 0.01 mm. When the range is set from “245” to “255”, the lighting stroke is 0.1 mm, so that the optimum position can be easily set by shifting the sensor head 20. When the optimum mounting position is set in this way, the sensor head 20 is fixed to the cylinder tube 11 using the screw 23.

  If the lighting range to be set is set to a large stroke, the mounting position has a large error. In order to eliminate such an error, the lighting range is set to a narrow range or the lighting position is set to only one numerically displayed point without providing the range. Even when the lighting position is set only for one numerically displayed point, the lighting range is set in advance within a predetermined stroke range before and after that point, for example, a range of 0.1 mm. This makes it easy to set the optimum position.

  In order to drive the piston rod 16 with the sensor head 20 attached in this way, compressed air is supplied to the cylinder tube 11 from the outside. When the piston 15 approaches the intermediate position from the stroke end position and the magnet 19 reaches the range of the detection stroke S of the magnetic sensor 23, the magnetic sensor 24 of the sensor head 20 calculates the output signal in response to the magnetic force of the magnet 19. Output to the unit 41. Based on the output signal from the magnetic sensor 24, the numerical value display unit 42 displays numerical position information indicating the position of the magnet 19 in the range of the detection stroke S. At the same time, the position information signal is output as an analog signal through the signal line 52 to the external control device. When the external control device is provided with a numerical display unit similar to the numerical display unit of the controller 30, the position information is displayed on the display unit. Furthermore, other drive devices can be controlled based on the position information.

  When the magnet 19 reaches the set lighting range or lighting position, the set lighting range or position is displayed on the numerical value display section 42, and the LED 25 is switched from the off state to the lighting state. Simultaneously with the lighting of the LED 25, the LED of the on / off display unit 51 is lit, and an on / off signal is output from the signal line 54 to the external control device. Based on this on / off output signal, for example, a control signal is sent to the flow path switching solenoid valve in order to stop the supply of compressed air to the pneumatic cylinder.

  The pneumatic cylinder shown in FIG. 1 is provided with a sensor head 20 for detecting the intermediate position of the piston 15. However, when the piston 15 reaches the forward limit position and when the piston 15 reaches the backward limit position, respectively. In order to attach other sensor heads 20 to the cylinder tube 11 for detection, the respective sensor heads are attached to the other sensor attachment grooves 21. Thus, when the magnetic sensor detects that the piston 15 has reached the reciprocating stroke end position, the forward limit position is detected with the piston rod 16 pulled out to the forward limit position. Therefore, another sensor head mounting operation for detecting the backward limit position is performed in a state where the piston rod 16 is retracted to the backward limit position.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, FIG. 1 and FIG. 2 show a pneumatic cylinder as an actuator to which the sensor head 20 is mounted. However, the actuator is not limited to a pneumatic cylinder, and a hydraulic cylinder, vane, The position of the magnet can also be detected by attaching the sensor head 20 to a rotary actuator that reciprocally rotates the swing shaft by the rack piston.

  As shown in FIG. 1, the sensor head 20 can be attached not only to the sensor attachment groove 21 but also to an actuator body of a type in which no sensor attachment groove is formed. In that case, the sensor head 20 is attached to the outer surface of the actuator body using a binding band or the like. In that case, the four sides of the case body 22 of the sensor head 20 are different from those shown in the figure. The shape is preferred.

It is a perspective view which shows the actuator with which the position detection apparatus which is one embodiment of this invention was mounted | worn. FIG. 2 is a sectional view taken along line 2-2 in FIG. It is an expansion perspective view of a sensor head. (A) is the schematic which shows an example of the element structure of a magnetic sensor, (B) is an equivalent circuit schematic of the magnetic sensor shown by (A). It is a block diagram which shows the control circuit in the controller shown in FIG.

Explanation of symbols

10 Actuator 11 Cylinder tube 15 Piston (moving member)
16 Piston rod 19 Magnet 20 Sensor head 21 Sensor mounting groove 24 Magnetic sensors 24a and 24b Magnetoresistive element assembly 25 LED (light emitting diode)
26 Cable 30 Controller 31 Controller case 41 Calculation unit 42 Numerical display unit 43 Scaling unit 47 Setting unit 48 Comparison unit 49 LED drive circuit S Detection stroke

Claims (5)

A position detection device for detecting the position of a moving member with a magnet movably incorporated inside an actuator body on the outside of the actuator body,
A magnetic sensor that outputs an output signal in response to the magnetic force of the magnet, and an LED that lights up according to the position of the moving member, and a sensor head mounted on the actuator body ;
A lighting range input unit for inputting a lighting position for lighting the LED in a detection stroke range in which the magnetic sensor is sensitive to the magnetic force of the magnet;
A controller that is connected to the sensor head via a cable and that controls lighting and extinction of the LED based on the output signal output from the magnetic sensor;
The controller displays a calculation unit that calculates position information of the magnet based on the output signal, a lighting position setting unit that sets a lighting position of the LED input by the lighting range input unit, and the position information And a comparison unit that outputs a lighting signal to the LED when the position information from the calculation unit reaches the lighting position . 2. The position detection device according to claim 1 , wherein the lighting range input unit includes first and second two of the detection stroke ranges in which the magnetic sensor is sensitive to the magnetic force of the magnet, wherein the moving member is displaced in the moving direction. The lighting range of the LED determined by the position is input, the lighting position setting unit sets the input lighting range of the LED, and the comparison unit is when the position information from the calculation unit becomes the lighting range A position detection device that outputs a lighting signal to the LED. A position detection device for detecting the position of a moving member with a magnet movably incorporated inside an actuator body on the outside of the actuator body,
A magnetic sensor that outputs an output signal in response to the magnetic force of the magnet, and an LED that lights up according to the position of the moving member, and a sensor head that is mounted on the actuator body ;
A lighting range input unit for inputting the lighting range of the LED determined by the first and second positions where the moving member is displaced in the moving direction in the detection stroke range in which the magnetic sensor is sensitive to the magnetic force of the magnet ; ,
A controller that is connected to the sensor head via a cable and that controls lighting and extinction of the LED based on the output signal output from the magnetic sensor;
The controller includes a calculation unit that calculates position information of the magnet based on the output signal, a lighting position setting unit that sets a lighting range input by the lighting range input unit, and a display unit that displays the position information. And a comparison unit that outputs a lighting signal to the LED when the position information from the calculation unit falls within the lighting range. A magnetic sensor sensitive to the magnetic force of a magnet of a moving member incorporated movably inside the actuator main body and an LED that lights up according to the position of the moving member are provided and attached to the actuator main body. A controller connected to the sensor head via a cable and outputting a control signal to the outside based on an output signal from the magnetic sensor;
A calculation unit for calculating positional information of the magnet based on the output signal output from the magnetic sensor;
A lighting position setting unit for setting a lighting position input by a lighting range input unit that inputs a lighting position for lighting the LED in a detection stroke range in which the magnetic sensor is sensitive to the magnetic force of the magnet ;
A display unit for displaying the position information;
And a comparison unit that outputs a lighting signal to the LED when the position information from the calculation unit becomes the lighting position. 5. The controller according to claim 4 , wherein the lighting range input unit includes first and second positions where the moving member is displaced in a moving direction within a detection stroke range in which the magnetic sensor is sensitive to the magnetic force of the magnet. The determined lighting range of the LED is input, the lighting position setting unit sets the input lighting range of the LED, and the comparison unit is configured when the position information from the calculation unit becomes the lighting range. A controller characterized by outputting a lighting signal to an LED.

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