JP2012190608A - Switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a switch capable of preventing unnecessary abnormalities from being notified.SOLUTION: A limit switch comprises an actuation body which is displaced according to the load of an external force, and an on/off signal output section 103 which outputs any one of on signal or off signal according to the displacement of the actuation body. The limit switch further comprises first abnormal signal control section 121 through fourth abnormal signal control section 124 having a function of outputting an abnormality forecast signal indicating occurrence of abnormality when it is detected, and first changeover switch 36 through fourth changeover switch 39 which change over to any one of an effective mode for making the function of the first abnormal signal control section 121 through fourth abnormal signal control section 124 effective, or an ineffective mode for making the function of the first abnormal signal control section 121 through fourth abnormal signal control section 124 ineffective.

Description

  The present invention relates to a switch that includes an operating body that is displaced according to a load of force from the outside, and that outputs an ON signal or an OFF signal according to the position of the operating body.

  Conventionally, a limit switch used to automatically start a processing machine by detecting that an object such as a product to be processed has been transferred to a predetermined position in a factory production line is known (non- Patent Document 1). The limit switch includes an operating body that moves by contact with an object, and operates according to the position of the operating body. The operating body is attached to a rotating shaft provided in the main body of the switch, so that it can rotate with respect to the rotating shaft. Further, the position of the operating body that is not in contact with the object is the reference position, and when the operating body is in contact with the object, the operating body rotates from the reference position to a position corresponding to the size of the object. Thereafter, the operating body returns to the reference position by moving away from the object.

  Regarding such limit switches, Patent Documents 1 and 2 describe the following techniques. The limit switch includes at least a first switch unit, a second switch unit that returns later than the first switch unit, and a timer that measures time. When such a limit switch comes into contact with the transferred object, the first switch unit and the second switch unit are turned on. Thereafter, the switch does not come into contact with the object, and after the first switch unit is turned off, the second switch unit is turned off. The timer measures the time from when the first switch unit is turned off to when the second switch unit is turned off. Thereby, the return time of the limit switch is measured. Then, when the measured return time is longer than the time-up time, an abnormality signal is generated indicating that the operation of the operating body is dull due to some influence and that an abnormality may occur in the future.

  As described above, the limit switch has a function of outputting an abnormal signal when the return time of the operating body is longer than the time-up time. In addition, for example, it has a function of outputting an abnormality prediction signal indicating that there is a possibility that an abnormality will occur in the future when water intrusion is detected. When the limit switch detects at least one of a plurality of abnormalities, the limit switch outputs an abnormal signal to an external device.

JP-A-2-281513 (published on November 10, 1990) JP 64-049344 A (released February 16, 1989)

OMRON Corporation, “Limit Switch Technical Guide”, [online], [Searched on November 19, 2010], Internet <URL: http://www.fa.omron.co.jp/data_pdf/commentary/limitswitch_apparatus_tg_j_3_1_1- 5.pdf>

  However, some users who use limit switches want to notify only necessary abnormality signals. Specifically, there is a user who does not notify the abnormality related to the extension of the return time of the operating body, and wants to notify the abnormality due to flooding, or the user who thinks the opposite. For example, if the limit switch is not used underwater, but installed in a place where temperature changes are large and condensation is likely to occur, abnormalities due to ingress of water may not occur, but abnormalities due to infiltration due to condensation are frequent. Can occur. In such a case, there is a problem that notification of abnormality due to flooding is frequently issued and the user has to make unnecessary confirmation each time. In addition, when a limit switch is installed on a production line that frequently changes the moving speed of an object, the return time also changes frequently. In such a case, although the production line is intentionally changed to delay the return time, an abnormality regarding the extension of the return time is issued, and the user has to make unnecessary confirmation each time. There is a problem.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a switch that can prevent an unnecessary abnormality from being notified.

  In order to solve the above-described problems, the switch of the present invention includes an operating body that is displaced according to a load of an external force, and an on signal that outputs either an on signal or an off signal according to the amount of displacement of the operating body. / Off signal output unit, and the on / off signal output unit is a switch disposed inside the housing, and outputs an abnormal signal indicating that an abnormality has occurred when an abnormality is detected And a switching unit that switches between an effective mode that enables the function of the abnormal signal output unit and an invalid mode that disables the function of the abnormal signal output unit.

  According to the above configuration, when the user needs to output an abnormal signal, the user operates the switching unit to be in the valid mode, and when the abnormal signal is not necessary, the user sets the switching unit to the invalid mode. To operate. Thereby, the user can prevent an unnecessary abnormality from being notified by a simple operation.

  In the switch of the present invention, the abnormal signal output unit detects a plurality of types of abnormality, and the abnormal signal output unit detects the type of abnormality detected when any of the plurality of types of abnormality is detected. It is preferable to output an abnormal signal indicating that the error occurs, and the switching unit switches between the valid mode and the invalid mode for each of the plurality of types of abnormalities.

  According to the above configuration, the function of outputting an abnormality signal can be set to either valid or invalid for each of a plurality of abnormalities. Therefore, it is possible to appropriately set the invalidity for the type of abnormality that does not require the output of the abnormal signal and effectively set the type of abnormality that requires the output of the abnormal signal.

The contents of the abnormality include the following, for example.
First, in the switch of the present invention, the operating body is stopped at a predetermined reference position when there is no external force load, and position detection is performed to detect a displacement amount of the operating body from the reference position. The on / off signal output unit outputs an on signal when the displacement detected by the position detector is equal to or greater than a predetermined first displacement, and the abnormal signal output unit When an amount of displacement detected by the position detection unit is larger than a predetermined second amount of displacement that is greater than the first amount of displacement, an abnormality indicating that the amount of displacement is increasing is detected. Also good.

  Further, in the switch of the present invention, the operating body is stopped at a predetermined reference position when there is no external force load, and position detection for detecting a displacement amount of the operating body from the reference position. The on / off signal output unit outputs an on signal when the displacement detected by the position detector is equal to or greater than a predetermined first displacement, and the abnormal signal output unit An abnormality indicating that the amount of displacement is decreasing when the maximum amount of displacement detected by the position detection unit is larger than the first displacement amount and smaller than the predetermined third displacement amount. May be detected.

  In the switch of the present invention, the operating body is stopped at a predetermined reference position when there is no external force load, and the abnormal signal output unit is operated by the external force load. After the body is displaced, the return speed decreases when the return force of the operating body when the load of external force disappears and the operating body returns to the reference position is lower than a predetermined reference speed. An abnormality indicating this may be detected.

  In the switch of the present invention, the abnormal signal output unit may detect an abnormality indicating that water has entered the housing.

  Further, the switch of the present invention, when the abnormal signal output unit detects the abnormality, the setting processing unit to set the condition, and when the frequency of the abnormal signal output by the abnormal signal output unit is a predetermined frequency or more, A notification processing unit that outputs a notification that prompts the setting by the setting processing unit.

  When the output frequency of the abnormal signal is higher than the predetermined frequency, it is expected that some measures are not taken and the same state is maintained despite the reception of the abnormal signal. In such a state, the user who has received the notification of the abnormal signal may determine that no action is required because there is no particular problem. On the other hand, for the user, since the abnormal signal continues to be output at a high frequency, it takes time to confirm. However, according to the above configuration, the notification for prompting the setting by the setting processing unit is appropriately changed, so that the condition when the abnormality is detected is appropriately changed, and unnecessary abnormality signals can be reduced.

  Further, the switch of the present invention can be switched to an automatic mode in which the switching unit automatically switches between valid and invalid of the function of the abnormal signal output unit in addition to the valid mode and invalid mode. When the frequency of the abnormal signal output by the abnormal signal output unit is equal to or higher than a predetermined frequency, the switching unit invalidates the function of the abnormal signal output unit, and the abnormal signal output unit It is preferable that the function of the abnormal signal output unit is validated when the frequency of the output abnormal signal is less than a predetermined frequency.

  When the output frequency of the abnormal signal is higher than the predetermined frequency, it is expected that some measures are not taken and the same state is maintained despite the reception of the abnormal signal. In such a state, the user who has received the notification of the abnormal signal may determine that no action is required because there is no particular problem. On the other hand, for the user, since the abnormal signal continues to be output at a high frequency, it takes time to confirm. However, according to the above configuration, when the output frequency of the abnormal signal is higher than the predetermined frequency, it is possible to save the trouble of checking the unnecessary abnormal signal by automatically switching from the valid mode to the invalid mode.

  According to the present invention, it is possible to provide a switch capable of preventing an unnecessary abnormality from being notified.

It is a perspective view which shows the limit switch in this Embodiment. It is a front view which shows a switch module. It is a perspective view when a switch module is disassembled. It is a figure which shows the front surface of a plunger. It is the perspective view seen from the front side of a plunger. It is a figure which shows the back surface of a plunger. It is the perspective view seen from the back side of a plunger. It is a figure which shows the cross section of a plunger. It is a perspective view which shows a photo interrupter part with a board | substrate. It is the 1st figure which shows the positional relationship of a some light emitting element, a some light receiving element, and a plunger in the cross section of a switch module. It is a 2nd figure which shows the positional relationship of a some light emitting element, a some light receiving element, and a plunger in the cross section of a switch module. It is a 3rd figure which shows the positional relationship of a some light emitting element, a some light receiving element, and a plunger in the cross section of a switch module. FIG. 4 is a fourth view showing a positional relationship among a plurality of light emitting elements, a plurality of light receiving elements, and a plunger in a cross section of the switch module. It is a 5th figure which shows the positional relationship of a some light emitting element, a some light receiving element, and a plunger in the cross section of a switch module. It is the figure which showed the relationship between the angle of an action body, and the output voltage of a light receiving element. It is a block diagram which shows the structure of a switch module. It is a figure which shows an example of the table for extraction. It is a figure which shows the relationship between the angle of an action body, and the operation state of an action body. It is a figure which shows the relationship between the voltage value output from a light receiving element, the threshold value set by the setting process part, and the signal output from each determination part. It is a figure which shows an example of blink of a 1st pattern-a 4th pattern. It is a figure which shows the front view of the switch module in the modification 1. FIG. It is a block diagram which shows the structure of the switch module in the modification 1. FIG. 10 is a block diagram showing a configuration of a switch module in Modification 2.

  Embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

<Overall configuration of limit switch>
FIG. 1 is a perspective view showing a limit switch in the present embodiment. The limit switch detects the position, change, movement, or passage of an object, and outputs an ON (ON) signal / OFF (OFF) signal to an external device to be operated according to the presence or absence of detection. Switch. In addition, the limit switch in the present embodiment has a configuration that is protected from external force, water, oil, gas, dust, etc., considering that it is applied to a place where mechanical strength and environmental resistance are required. It is preferable.

  As shown in FIG. 1, the limit switch 1 includes a casing (housing) 3, a mounting block 5, and an operating body 7.

  The casing 3 has a switch module 11 disposed in its internal space, and is intended to protect the switch module 11 from external force, water, oil, gas, dust and the like. The casing 3 includes a casing body 3a having an opening for incorporating the switch module 11 in the internal space thereof, and a lid portion 3b for closing the opening.

  The mounting block 5 is attached to the upper part of the casing 3. In addition, the operating body 7 is rotatably attached to the mounting block 5 with screws 9.

  The operating body 7 protrudes from the mounting block 5 and rotates when a force is applied from the outside by contact with an object. An ON signal / OFF signal is output to the external device to be operated according to the rotation angle of the operating body 7. Here, the position of the operating body 7 when the force is not applied from the outside and the actuator 7 is stopped is set as a reference position. Here, the reference position of the operating body 7 is set to a position facing the direction of 0 o'clock of the timepiece. In FIG. 1, when a force is applied from the left direction, the actuator 7 rotates clockwise with respect to the screw 9 and then returns to the reference position when the force is removed. On the other hand, when a force is applied from the right direction, the operating body 7 rotates counterclockwise with respect to the screw 9 and then returns to the reference position when the force is removed. Here, the angle at which the operating body 7 can rotate is set in a range (for example, 0 degrees to ± 50 degrees) from a reference position to a predetermined angle (hereinafter referred to as a limit value). In the following, the position of the operating body is indicated by an angle from the reference position. A clockwise direction from the reference position is a positive direction, and a counterclockwise direction from the reference position is a negative direction. Hereinafter, a case where the operating body 7 rotates in the positive direction will be described as an example.

  In addition, the sealing member is arrange | positioned in the connection location with the casing main body 3a, the cover part 3b, the mounting block 5, and the action body 7, and the penetration | invasion of water, oil, gas, etc. is prevented.

  In the present embodiment, the limit switch 1 has a function of detecting an abnormality that may cause a failure in the future and outputting a different abnormality prediction signal for each type of abnormality. Thereby, the user can recognize what kind of abnormality has occurred by confirming the abnormality prediction signal output from the limit switch 1, and can take appropriate action early.

Here, the abnormality detected by the limit switch 1 will be described.
As described above, the limit switch 1 is turned on with respect to the external device to be operated by the limit switch 1 in accordance with the angle (displacement amount) from the reference position when the operating body 7 is rotated by contact with the object. Output a signal. However, the object does not always contact the operating body 7 in the same state. Weight, size, travel path, etc. may vary slightly depending on the object. Even if there is such a change, it is desired that the limit switch 1 operates normally.

  On the other hand, when the limit switch 1 is used for a long period of time, there is a possibility that the relative positional relationship between the limit switch 1 and the moving path of the object gradually changes due to some cause such as vibration. It is conceivable that the angle of the working body 7 when the object contacts the working body 7 gradually increases or gradually decreases due to such a change over a long period of time.

  When the angle of the actuating body 7 when the object contacts the actuating body 7 gradually increases over a long period of time, a force exceeding the limit value of the angle of the actuating body 7 is applied to the actuating body 7, and mechanical Failure may occur. Therefore, the limit switch 1 of the present embodiment has a function of detecting an abnormality (angle excess abnormality) in which the angle (displacement amount) of the operating body 7 is increasing and outputting an angle excess signal as an abnormality prediction signal. ing.

  In addition, when the angle of the working body 7 when the object contacts the working body 7 gradually decreases over a long period, there is a possibility that the ON signal is not normally output. If such a failure or abnormality occurs during operation of the production line, the entire production line must be stopped. Therefore, it is desirable to be able to predict that a failure or abnormality may occur in the future before such a failure or abnormality occurs. Therefore, the limit switch 1 of the present embodiment has a function of detecting an abnormality (angle shortage abnormality) in which the angle (displacement) of the operating body 7 is decreasing and outputting an angle shortage signal as an abnormality prediction signal. ing.

  Furthermore, when using for a long period of time, the frictional force between the operating body 7 and its rotating shaft may gradually increase due to some influence. In this case, the return speed of the operating body 7 to the reference position immediately after the object is separated from the operating body 7 gradually decreases. If the return speed is slow, the next object may not be detected normally. Here, the return speed at which the next object cannot be detected normally is defined as a predetermined limit speed. At this time, it is desirable to be able to predict that the return speed is starting to decrease before the return speed becomes equal to or lower than the predetermined limit speed. Therefore, the limit switch 1 according to the present embodiment has a function of detecting an abnormality (return speed decrease abnormality) in which the return speed is slow and outputting a return speed decrease signal as an abnormality prediction signal.

  Furthermore, if water enters the inside of the casing 3, a failure may occur. Therefore, the limit switch 1 of the present embodiment has a function of detecting an abnormality (seal abnormality) due to water intrusion and outputting a seal failure signal as an abnormality prediction signal.

  Thus, the limit switch 1 has a function of detecting four types of abnormalities, that is, an excessive angle abnormality, an insufficient angle abnormality, a return speed decrease abnormality, and a seal abnormality and outputting a corresponding abnormality prediction signal.

<Configuration of switch module>
The limit switch 1 includes a switch module 11 in the internal space of the casing 3. The switch module 11 outputs various signals to external devices connected thereto.

  FIG. 2 is a front view showing the appearance of the switch module. As shown in FIG. 2, the switch module 11 includes a switch unit 35, a lighting unit 20, and terminals 31 to 34.

  The terminals 31 and 32 are terminals for connecting to a device that supplies power. The terminals 33 and 34 are terminals connected to equipment used for production line work. Various signals are output from the terminals 33 and 34 to an external device.

  The lighting unit 20 includes a first lighting unit 21, a second lighting unit 23, and a third lighting unit 25. The first lighting unit 21, the second lighting unit 23, and the third lighting unit 25 include an LED lighting circuit and a light guide bar for guiding light emitted from the LED lighting circuit to the surface of the switch module 11. The second lighting unit 23 emits light when the switch module 11 is supplied with power from the power supply device, and is specifically a power lamp.

  The switch section (switching section) 35 includes a first switch (switching section) 36, a second switching switch (switching section) 37, a third switching switch (switching section) 38, and a fourth switching switch (switching section). 39. Here, the first change-over switches 36 to 39 are switches that can switch the function of outputting the abnormality prediction signal for the target type of abnormality to either the valid mode or the invalid mode. When the user switches to the valid mode, the function of outputting the abnormality prediction signal is enabled, and when the user switches to the invalid mode, the function of outputting the abnormality prediction signal is disabled. The first changeover switch 36 is intended for an excessive angle abnormality, the second changeover switch 37 is for an insufficient angle abnormality, the third changeover switch 38 is for a return speed drop abnormality, and the fourth changeover switch 39 is for a seal abnormality.

  FIG. 3 is a perspective view when the switch module is disassembled. As shown in FIG. 3, in addition to the terminals 31 to 34 and the lighting unit 20, the switch module 11 includes a microcomputer 100 that controls the entire switch module 11, a photo interrupter unit 41 as an optical sensor, and a coil spring. 42, a plunger 43, a seat 46, and electrodes 45 and 47.

  The sheet 46 is a sheet made of an insulating material, and is disposed between the electrode 45 and the electrode 47. For this reason, the electrode 45 and the electrode 47 are in a non-contact state, and the electrical resistance between the electrode 45 and the electrode 47 is increased. However, the sheet 46 has a smaller planar area than the electrodes 45 and 47. Therefore, when water enters the gap where the sheet 46 between the electrode 45 and the electrode 47 does not exist, the electrical resistance between the electrode 45 and the electrode 47 becomes low. Therefore, by checking the electrical resistance value between the electrode 45 and the electrode 47, the presence or absence of water intrusion can be estimated.

  The plunger 43 is a rod-shaped component having a different horizontal width and vertical width. When the operating body 7 rotates, the plunger 43 can move in parallel with the longitudinal direction of the plunger 43 in conjunction with the movement. That is, the plunger 43 is a displacement member that is displaced according to the load of force from the outside. Various known techniques can be used as a mechanism in which the plunger 43 is interlocked with the movement of the operating body 7. Here, as described in Patent Document 1, a part of the rotating shaft of the operating body 7 has a flat shape, and the flat portion and one end in the longitudinal direction of the plunger 43 are in contact with each other. It is configured. Here, the plunger 43 when the operating body 7 is at the reference position (that is, the operating body 7 is not in contact with the object and does not rotate) and the flat portion and the plunger 43 are in contact with each other. The position of is a fixed position. In this case, the flat portion is also rotated by the rotation of the operating body 7, and a force can be applied to the plunger 43 in the longitudinal direction of the plunger 43. As a result, the plunger 43 is displaced from its home position along its longitudinal direction. Further, a biasing force for returning the plunger 43 to a fixed position is applied by the coil spring 42. Therefore, when the operating body 7 returns to the reference position, the plunger 43 also returns to the reference position by the biasing force of the coil spring 42.

  Here, a specific shape of the plunger 43 will be described. FIG. 4 is a view showing the front surface of the plunger. FIG. 5 is a perspective view seen from the front side of the plunger. FIG. 6 is a view showing the back surface of the plunger. FIG. 7 is a perspective view seen from the back side of the plunger. FIG. 8 is a diagram showing a cross section of the plunger. 4-8, the plunger 43 has the main-body part 70 and the projection part 76. As shown in FIG. The protrusion 76 is coupled to the main body 70 and is thinner than the main body 70. The protrusion 76 is inserted into the coil spring 42.

  The main body 70 has slits (openings) 71 to 74. Here, since the shapes of the slits 71 to 74 are the same, the slit 71 will be described. The slit 71 has a different opening size between the front surface and the back surface of the plunger 43. Specifically, the shape of the cross section of the opening of the slit 71 is the shape of the region shown other than the shaded region surrounded by the broken line as shown in FIG. The size of the opening of the slit 71 on the front surface of the plunger 43 is set larger than the size of the opening of the slit 71 on the back surface of the plunger 43.

  The photo interrupter unit 41 measures a voltage based on the amount of light that changes according to the position of the plunger 43, and outputs the measured voltage to the microcomputer 100. The photo interrupter unit 41 includes a plurality of light emitting elements and a plurality of light receiving elements. The light receiving element is, for example, a single phototransistor, a photo IC or a photodiode, and converts the voltage into a voltage corresponding to the amount of light received on the light receiving surface. The light emitting element is, for example, a light emitting diode, and emits light with high linearity from the light emitting surface. A plunger 43 is disposed between the plurality of light receiving elements and the plurality of light emitting elements, and the plunger 43 moves in conjunction with the movement of the operating body 7 therebetween. For this reason, the light emitted from the light emitting element passes through the slit of the plunger 43 or is blocked by a region other than the slit. Therefore, the light received by each of the plurality of light receiving elements is light that has passed through the slit of the plunger 43 among the light emitted by each of the plurality of light emitting elements.

  FIG. 9 is a perspective view showing the photointerrupter portion together with the substrate. As shown in FIG. 9, the photo interrupter unit 41 includes light-emitting elements 51 to 54 having the same shape and the same size, and light-receiving elements 61 to 64 having the same shape and the same size as the light-emitting elements 51 to 54. Here, although the light emitting elements 51 to 54 and the light receiving elements 61 to 64 have the same shape and the same size, the shapes and the sizes may not all be the same.

  The light emitting elements 51 to 54 and the light receiving elements 61 to 64 are arranged on the same straight line along the longitudinal direction of the plunger 43. The light emitting surface of the light emitting element 51 and the light receiving surface of the light receiving element 61 face each other. Similarly, the light emitting surface of the light emitting element 52 and the light receiving surface of the light receiving element 62 face each other, the light emitting surface of the light emitting element 53 and the light receiving surface of the light receiving element 63 face each other, and the light emitting surface of the light emitting element 54 and the light receiving surface of the light receiving element 64. Face each other. Therefore, the light receiving elements 61 to 64 can receive light emitted from the light emitting elements 51 to 54 in a one-to-one relationship. That is, the light emitting element 51 and the light receiving element 61 constitute one photo interrupter (light detection unit) that detects the presence or absence of an object between the light emitting element 51 and the light receiving element 61. Similarly, each of the combination of the issuing element 52 and the light receiving element 62, the combination of the light emitting element 53 and the light receiving element 63, and the combination of the light emitting element 54 and the light receiving element 64 becomes one photo interrupter (light detection unit).

  In addition, the light emitting elements 51 to 54 and the light receiving elements 61 to 64 are arranged apart by a distance in the width direction of the plunger 43 or a distance slightly larger than the width. For this reason, it is possible to arrange the plunger 43 between the light emitting elements 51 to 54 and the light receiving elements 61 to 64. With this arrangement, the plunger 43 translates in a direction perpendicular to the direction in which the light emitting elements 51 to 54 and the light receiving elements 61 to 64 face each other in conjunction with the movement of the operating body 7.

<Positional relationship between photo interrupter and plunger>
FIGS. 10-14 is a figure which shows the positional relationship of a some light emitting element, a some light receiving element, and a plunger in the cross section of a switch module. 10 is a view when the operating body 7 is located at the reference position, and FIG. 11 is a view when the operating body 7 is located at a position of 15 degrees (that is, a position rotated 15 degrees from the reference position). 12 is a view when the operating body 7 is located at a position of 22.5 degrees, FIG. 13 is a view when the operating body 7 is located at a position of 30 degrees, and FIG. It is a figure when the body 7 is located in the position of 42.5 degree | times. Here, the positions at which the light emitting elements 51 to 54 and the light receiving elements 61 to 64 are arranged are as shown in FIG.

  As shown in FIGS. 10 to 14, the switch module 11 includes a partition plate 81. The partition plate 81 is a plate for partitioning the light emitting elements 51 to 54, the light receiving elements 61 to 64, and the plunger 43. Specifically, the partition plate 81 includes a first partition plate 81 a for partitioning the light emitting elements 51 to 54 and the plunger 43, and a second partition plate 81 b for partitioning the light receiving elements 61 to 64 and the plunger 43. And a third partition plate 81c positioned between the first partition plate 81a and the second partition plate 81b. The plunger 43 is disposed between the first partition plate 81a and the second partition plate 81b. Here, the back surface of the plunger 43 is adjacent to the second partition plate 81b, and the front surface of the plunger 43 is adjacent to the first partition plate 81a. That is, the front surface of the plunger 43 and the light emitting elements 51 to 54 face each other, and the back surface of the plunger 43 and the light receiving elements 61 to 64 face each other. As shown in FIG. 4, portions other than the slits 71 to 74 in the main body portion 70 of the plunger 43 are indicated by hatching. This shaded area is hereinafter referred to as a light blocking area.

  Further, the first partition plate 81a partitions each of the light emitting elements 51 to 54, and the second partition plate 81b partitions each of the light receiving elements 61 to 64. The first partition plate 81a has a plurality of openings corresponding to positions where the light emitting elements 51 to 54 are disposed. Specifically, each of the plurality of openings of the first partition plate 81a is located at a position where light emitted from each of the light emitting elements 51 to 54 can pass. The second partition plate 81b has a plurality of openings corresponding to the positions where the light receiving elements 61 to 64 are arranged. Specifically, each of the plurality of openings of the second partition plate 81b is located at a position where each of the light receiving elements 61 to 64 can receive light from the light emitting elements 51 to 54. Therefore, the light emitted from the light emitting element is a region that linearly connects each of the openings formed in the first partition plate 81a and the opening formed in the second partition plate 81b corresponding to the opening. This is the region through which the light passes (optical path region).

  Furthermore, the third partition plate 81c has a hole through which only the protrusion 76 of the plunger 43 is inserted. Therefore, the coil spring 42 in which the protrusion 76 is inserted exists between the third partition plate 81 c and the main body 70. When the plunger 43 is translated in the direction of the third partition plate 81 c according to the movement of the operating body 7, the coil spring 42 contracts between the main body portion 70 of the plunger 43 and the third partition plate 81 c, and the plunger 43 A force is applied to the plunger 43 to return the position to the reference position.

  As described above, the plunger 43 moves in the longitudinal direction in conjunction with the movement of the operating body 7. In the middle of this movement, the slit 71 is formed in the plunger 43 so that the slit 71 overlaps the opening of the first partition plate 81 a corresponding to the light emitting element 51 and the opening of the second partition plate 81 b corresponding to the light receiving element 61. Is formed. Similarly, the slit 72 is formed in the plunger 43 so that the slit 72 overlaps the opening of the first partition plate 81 a corresponding to the light emitting element 52 and the opening of the second partition plate 81 b corresponding to the light receiving element 62. Yes. Further, the slit 73 is formed in the plunger 43 so that the slit 73 overlaps the opening of the first partition plate 81 a corresponding to the light emitting element 53 and the opening of the second partition plate 81 b corresponding to the light receiving element 63. . Further, the slit 74 is formed in the plunger 43 so that the slit 74 overlaps the opening of the first partition plate 81 a corresponding to the light emitting element 54 and the opening of the second partition plate 81 b corresponding to the light receiving element 64. . Thus, each of the slits 71 to 74 corresponds to each of the light emitting elements 51 to 54 and the light receiving elements 61 to 64.

  However, the distance between each of the openings on the back side of the slits 71 to 74 and the opening of the second partition plate 81 b corresponding to the slit is different for each of the slits 71 to 74. Specifically, as shown in FIG. 10, when the actuating body 7 is in the reference position (that is, when the plunger 43 is in the reference position), the opening on the back side of the slit 71 and the second corresponding to the slit 71. A distance A from the opening of the partition plate 81b, a distance B from the opening on the back side of the slit 72 and the opening of the second partition plate 81b corresponding to the slit 72, and an opening on the back side of the slit 73 and the slit 73. Each slit 71 has a distance C between the opening of the second partition plate 81b and a distance D between the opening on the back side of the slit 74 and the opening of the second partition plate 81b corresponding to the slit 74 in this order. The positions of -74 are set.

  Here, among the positions of the plunger 43 when the light receiving elements 61 to 64 detect the light that has passed through the slits 71 to 74, the position where the amount of displacement from the fixed position is the minimum is the light detection start position. In this case, the distances A to D indicate distances from the home position to the light detection start position.

  When such a plunger 43 moves in parallel with the movement of the operating body 7, the light emitted from the light emitting elements 51 to 54 is blocked or allowed to pass according to the position. Specifically, when the opening of the second partition plate 81b overlaps the light blocking area of the plunger 43 due to the change in the position of the plunger 43, the plunger 43 blocks the light to the light receiving element corresponding to the opening. To do. In addition, when the opening of the second partition plate 81b and at least a part of the slit of the plunger 43 overlap with each other, the plunger 43 allows the light to pass to the light receiving element corresponding to the opening. In other words, light passes when the optical path from the light emitting elements 51 to 54 to the light receiving elements 61 to 64 and at least a part of the slits 71 to 74 overlap. The amount of light incident on the light receiving element at this time is proportional to the size of the area where the opening of the second partition plate 81b and the opening of the slit overlap.

  Which of the light emitted from each of the light emitting elements 51 to 54 is blocked by the plunger 43 corresponds to the position of the plunger 43, that is, the angle from the reference position in the operating body 7. Hereinafter, with reference to FIGS. 10 to 14, as the angle from the reference position of the operating body 7 changes, whether or not light is incident on each of the light receiving elements 61 to 64 and how the amount of incident light is changed. Explain how it changes.

  As shown in FIG. 10, the plunger 43 blocks all the light emitted from the light emitting elements 51 to 54 when the operating body 7 is positioned at 0 degree (reference position). Specifically, the light blocking area of the plunger 43 covers all the openings corresponding to the positions where the light receiving elements 61 to 64 are arranged on the second partition plate. For this reason, the light emitted from each of the light emitting elements 51 to 54 is blocked by the plunger 43 and does not reach the light receiving elements 61 to 64.

  The operating body 7 is rotated from the state shown in FIG. 10, and the plunger 43 is moved in the longitudinal direction. At this time, as described above, the distance A between the opening on the back side of the slit 71 and the opening of the second partition plate 81b corresponding to the slit 71 is shorter than the other distances B to D. Only the opening of the second partition plate 81 b corresponding to the light receiving element 61 starts to overlap. Thereafter, as the angle of the operating body 7 increases, the overlapping area between the opening on the back side of the slit 71 and the opening of the second partition plate 81 b corresponding to the light receiving element 61 increases as the movement amount of the plunger 43 increases. At the same time, the opening on the back side of the slit 72 and the opening of the second partition plate 81 b corresponding to the light receiving element 62 begin to overlap.

  As shown in FIG. 11, when the operating body 7 is located at a position of 15 degrees, the opening on the back side of the slit 71 overlaps with the entire area of the opening of the second partition plate 81 b corresponding to the light receiving element 61. Yes. In other words, a space that linearly connects the opening corresponding to the position where the light emitting element 51 is disposed in the first partition plate 81a and the opening corresponding to the position where the light receiving element 61 is disposed in the second partition plate 81b. In all of the (optical path region), the opening of the slit 71 is located. Further, the opening on the back side of the slit 72 overlaps with a part of the opening of the second partition plate 81 b corresponding to the light receiving element 62. In other words, a space that linearly connects the opening corresponding to the position where the light emitting element 52 is arranged in the first partition plate 81a and the opening corresponding to the position where the light receiving element 62 is arranged in the second partition plate 81b. In the (optical path region), only a part of the opening of the slit 72 is located. Therefore, the amount of light received by the light receiving element 61 becomes the maximum value, and the light receiving element 62 receives only a part of the light emitted from the light emitting element 52. At this stage, the light blocking area of the plunger 43 covers the opening of the second partition plate 81b corresponding to the position where the light receiving elements 53 and 54 are still arranged. Therefore, light does not reach the light receiving elements 53 and 54.

  The operating body 7 is further rotated from the state shown in FIG. 11, and the plunger 43 is moved in the longitudinal direction. At this time, as the angle of the operating body 7 increases, the overlapping area between the opening on the back side of the slit 72 and the opening of the second partition plate 81 b corresponding to the light receiving element 62 increases as the movement amount of the plunger 43 increases. At the same time, the opening on the back side of the slit 73 and the opening of the second partition plate 81 b corresponding to the light receiving element 63 begin to overlap.

  As shown in FIG. 12, when the operating body 7 is located at a position of 22.5 degrees, the openings on the back side of the slits 71 and 72 of the second partition plate 81b corresponding to the light receiving elements 61 and 62, respectively. It overlaps with the entire area of the opening. In other words, a space that linearly connects the opening corresponding to the position where the light emitting element 51 is disposed in the first partition plate 81a and the opening corresponding to the position where the light receiving element 61 is disposed in the second partition plate 81b. In all of the (optical path region), the opening of the slit 71 is located. Similarly, a space that linearly connects the opening corresponding to the position where the light emitting element 52 is arranged in the first partition plate 81a and the opening corresponding to the position where the light receiving element 62 is arranged in the second partition plate 81b. In all of the (optical path region), the opening of the slit 72 is located. Further, the opening on the back side of the slit 73 overlaps with a part of the opening of the second partition plate 81 b corresponding to the light receiving element 63. In other words, a space that linearly connects the opening corresponding to the position where the light emitting element 53 is arranged in the first partition plate 81a and the opening corresponding to the position where the light receiving element 63 is arranged in the second partition plate 81b. In the (optical path region), only a part of the opening of the slit 73 is located. Therefore, the amount of light received by the light receiving elements 61 and 62 becomes the maximum value, and the light receiving element 63 receives only a part of the light emitted from the light emitting element 53. At this stage, the light blocking area of the plunger 43 covers the opening of the second partition plate 81b corresponding to the position where the light receiving element 54 is still arranged. Therefore, light does not reach the light receiving element 64.

  When the operating body 7 is further rotated from the state shown in FIG. 12 and the plunger 43 is moved in the longitudinal direction, the opening on the back side of the slit 73 and the second partition plate 81b corresponding to the light receiving element 63 are arranged. The overlapping area with the opening increases.

  As shown in FIG. 13, when the operating body 7 is located at a position of 30 degrees, the second partition plates in which the openings on the back side of the slits 71, 72, 73 correspond to the light receiving elements 61, 62, 63 respectively. It overlaps with the entire area of the opening 81b. For this reason, the amount of light received by the light receiving elements 61, 62, and 63 has a maximum value. At this stage, the light blocking area of the plunger 43 covers the opening of the second partition plate 81b corresponding to the position where the light receiving element 54 is still arranged. Therefore, light does not reach the light receiving element 64.

  When the operating body 7 is further rotated from the state shown in FIG. 13 and the plunger 43 is moved in the longitudinal direction, the opening on the back side of the slit 73 and the second partition plate 81b corresponding to the light receiving element 63 are arranged. Only the opening begins to overlap.

  As shown in FIG. 14, when the operating body 7 is located at a position of 42.5 degrees, each of the openings on the back side of the slits 71 to 74 corresponds to the second partition plate 81 b corresponding to the light receiving elements 61 to 64. It overlaps with the entire area of the opening. For this reason, the amount of light received by the light receiving elements 61 to 64 is the maximum value.

  FIG. 15 is a diagram showing the relationship between the angle of the operating body and the output voltage of the light receiving element. As shown in FIG. 15, the relationship between the voltage output when each of the light receiving elements 61 to 64 receives light from each of the light emitting elements 51 to 54 and the position of the operating body 7 is indicated by four broken lines 91 to 94. . The broken line 91 corresponds to the light receiving element 61, the broken line 92 corresponds to the light receiving element 62, the broken line 93 corresponds to the light receiving element 63, and the broken line 94 corresponds to the light receiving element 64.

  When the angle of the operating body 7 is 0 degree or more and less than 5 degrees, the light emitted from each of the light emitting elements 51 to 54 is blocked, and when the angle of the operating body 7 is 12.5 degrees or more and less than 20 degrees, the light emitting elements 51 and 52. Each of the light emitting elements 51 to 53 emits when the light emitted from each of the light emitting elements 53 to 55 is blocked and the light emitted from each of the light emitting elements 53 to 55 is blocked, and the angle of the operating body 7 is 20 degrees or more and less than 32.5 degrees. When at least part of the light is allowed to pass through and the light emitted from each of the light emitting elements 54 and 55 is blocked, and the angle of the operating body 7 is 32.5 degrees or more and less than 50 degrees, at least the light emitted from each of the light emitting elements 51 to 54 Let some through. When the angle is 5 to 15 degrees, the output voltage from the light receiving element 61 increases continuously in proportion to the angle. This is because the size of the overlapping area between the opening of the second partition plate 81b corresponding to the light receiving element 61 and the slit 71 increases as the angle increases. Similarly, when the angle is 12.5 to 22.5 degrees, the output voltage from the light receiving element 62 is 20 degrees, and when the angle is 20 to 30 degrees, the output voltage from the light receiving element 63 is 32.5 to 42.5 degrees. The output voltage from the light receiving element 64 continuously increases in proportion to the angle.

  Thus, the light passing through the plunger 43 increases as the angle of the operating body 7 increases. Conversely, as the angle of the operating body 7 decreases, the amount of light that passes through the plunger 43 decreases. In this manner, the position of the plunger 43 changes according to the rotation angle from the reference position of the operating body 7, and the amount of light received by each of the light receiving elements 61 to 64 differs depending on the position of the plunger 43. . In addition, among the positions of the plunger 43 where the amount of incident light is maximized with respect to each of the light receiving elements 61 to 64, the position of the plunger 43 where the amount of displacement from the reference position is the minimum is the light quantity maximum position. At this time, the light quantity maximum position is different for each of the light receiving elements 61 to 64. The light quantity maximum position of the light receiving element 61 is the position of the plunger 43 when the operating body 7 is 15 degrees, and the light quantity maximum position of the light receiving element 62 is the position of the plunger 43 when the operating body 7 is 22.5 degrees. The maximum light quantity position of the light receiving element 63 is the position of the plunger 43 when the operating body 7 is 30 degrees, and the maximum light quantity position of the light receiving element 64 is the plunger when the operating body 7 is 42.5 degrees. 43 positions.

  FIG. 15 also shows that the position of the plunger 43 (light detection start position) when the light receiving elements 61 to 64 start detecting light is different for each of the light receiving elements 61 to 64. Specifically, the light detection start position corresponding to the light receiving element 61 is the position of the plunger 43 when the operating body 7 is at a position of 5 degrees, and the light detection start position corresponding to the light receiving element 62 is the operating body. 7 is the position of the plunger 43 when the position is 12.5 degrees, and the light detection start position corresponding to the light receiving element 63 is the position of the plunger 43 when the operating body 7 is located at the position of 20 degrees. The light detection start position corresponding to the light receiving element 64 is the position of the plunger 43 when the operating body 7 is at the position of 32.5 degrees.

  Thus, since the light quantity maximum position or the light detection start position is different for each of the light receiving elements 61 to 64, the position range of the plunger 43 when the light receiving elements 61 to 64 detect light is also different.

  In the above description, the front surface of the plunger 43 is opposed to the light emitting elements 51 to 54, and the rear surface of the plunger 43 is opposed to the light receiving elements 61 to 64. However, conversely, the back surface of the plunger 43 may be opposed to the light emitting elements 51 to 54, and the front surface of the plunger 43 may be opposed to the light receiving elements 61 to 64. Even in this case, the relationship between the angle of the operating body and the output voltage of the light receiving element is the same as in FIG.

<Relationship between microcomputer and peripheral components>
FIG. 16 is a block diagram showing the configuration of the switch module. As shown in FIG. 16, the switch module 11 includes the light receiving elements 61 to 64, the first lighting unit 21, the third lighting unit 25, the switch unit 35, the microcomputer 100, the low voltage circuit 101, An OFF signal output unit (ON / OFF signal output unit) 103, an abnormality prediction output unit (abnormal signal output unit) 105, and a resistance measurement unit 107 are provided.

  When power is supplied from the power supply device, the low voltage circuit 101 converts the voltage applied to the load into a predetermined voltage and then outputs the voltage to the microcomputer 100. When the power supplied from the power supply apparatus is input via the low voltage circuit 101, the microcomputer 100 lights the second lighting unit 23 shown in FIG.

  The resistance measurement unit 107 measures the electrical resistance value between the electrode 45 and the electrode 47 and outputs the measured electrical resistance value to the microcomputer 100. As shown in FIG. 3, since the sheet 46 formed of an insulating material is sandwiched between the electrode 45 and the electrode 47, the electrode 45 and the electrode 47 are not in contact with each other. When water enters the gap 47, the electrodes 45, 47 are energized, and the electrical resistance value between the electrodes 45, 47 decreases. Therefore, when the electrical resistance value measured by the resistance measuring unit 107 decreases, a seal abnormality has occurred.

  The light receiving elements 61 to 64 output voltages corresponding to the amounts of light received from the corresponding light emitting elements 51 to 54 to the microcomputer 100. Here, the voltage output from each of the light receiving elements 61 to 64 when the light blocking region of the plunger 43 does not exist in the optical path between the light receiving elements 61 to 64 and the light emitting elements 51 to 54 is defined as the maximum voltage.

  Each of the switches 36 to 39 of the switch unit 35 outputs a signal indicating the valid mode or the invalid mode to the microcomputer 100 according to the state set by the user.

  The ON / OFF signal output unit 103 is controlled by the microcomputer 100 and receives an ON signal (ON signal) or an OFF signal (OFF signal) for controlling driving of an external device to be operated by the limit switch 1 as a terminal 33. (See FIG. 2).

  The abnormality prediction output unit 105 is controlled by the microcomputer 100 and outputs an abnormality prediction signal indicating that an abnormality occurring in the limit switch 1 has been predicted from the terminal 34 (see FIG. 2).

  The first lighting unit 21 and the third lighting unit 25 are controlled by the microcomputer 100 to emit light.

  Next, an internal functional configuration of the microcomputer 100 will be described. The microcomputer 100 includes a CPU and a memory for storing a program, and the CPU functions by reading the program from the memory and performing an operation according to the program. As shown in FIG. 16, the microcomputer 100 includes an A / D conversion unit 111, a position detection unit (position detection unit) 113, memories 115 and 117, and an output signal control unit 119.

  The A / D converter 111 receives the analog voltage output from the light receiving elements 61 to 64 and converts the value of the analog voltage into a digital value.

  The position detection unit 113 detects the position of the operating body 7 (here, the angle from the reference position). The position detection unit 113 includes a first determination unit 113-1 to a fourth determination unit 113-4. Since the functions of the first determination unit 113-1 to the fourth determination unit 113-4 are the same, only the first determination unit 113-1 will be described here.

  The first determination unit 113-1 extracts one digital value from the four digital values corresponding to the light receiving elements 61 to 64 output from the A / D conversion unit 111. This extraction is performed using an extraction table stored in the memory 115. The extraction table includes 4 corresponding to determination unit identification information for identifying the kth determination unit 113-k and the light receiving elements 61 to 64 for the kth determination unit (any of k = 1 to 4) 113-k. Among the digital values, the information is associated with light receiving element identification information for identifying the light receiving element used by the k-th determination unit 113-k. FIG. 17 is an example of an extraction table. In the case of the extraction table shown in FIG. 17, since the light receiving element identification information corresponding to the determination unit identification information indicating the first determination unit 113-1 is the light receiving element 61, the first determination unit 113-1 is illustrated. Extracts a digital value from the light receiving element 61.

  The first determination unit 113-1 compares the extracted digital value with the first threshold value stored in the memory 117, and extracts a HIGH signal when the extracted digital value is equal to or greater than the first threshold value. When the digital value is less than the first threshold value, the LOW signal is output to the output signal control unit 119. The kth threshold value stored in the memory 117 corresponds to the kth determination unit 113-k and is used by the kth determination unit 113-k.

  The output signal control unit 119 controls the ON / OFF signal output unit 103, the abnormality prediction output unit 105, the first lighting unit 21, and the third lighting unit 25. The output signal control unit 119 includes an ON / OFF signal control unit (on / off signal output unit) 120 that controls whether an ON signal or an OFF signal is output to an external device that is an operation target, and an excessive angle abnormality. A first abnormality signal control unit (abnormal signal output unit) 121 that controls the output of the angle excess signal, and a second abnormality signal control unit (abnormality) that detects the angle shortage abnormality and controls the output of the angle insufficient signal. Signal output unit) 122, a third abnormality signal control unit (abnormal signal output unit) 123 that detects a return speed decrease signal and controls the output of a return speed decrease signal, and detects a seal error and outputs a seal failure signal. And a fourth abnormal signal control unit (abnormal signal output unit) 124 for controlling.

<Specific examples of output signal control>
Next, a specific example of output signal control in the present embodiment will be described.
FIG. 18 is a diagram illustrating the relationship between the angle of the operating body and the operating state. Here, the relative positional relationship between the movement path of the object and the limit switch 1 is set so that when the average object comes into contact with the working body 7, the working body 7 rotates about 30 to 35 degrees. And Here, it is assumed that the limit value of the angle of the operating body 7 (shown as TTP in the figure) is 50 degrees.

  In this case, in order for the limit switch 1 to output the ON signal in a normal state regardless of individual differences in the object such as the weight, size, movement path, etc., the average angle of the operating body 7 (30 to 35). It is preferable to set an angle smaller than (degrees) (for example, 15 degrees) as the operation angle for outputting the ON signal.

  Further, when an angle exceeding an angle (for example, 40 degrees) that is larger than the average angle (30 to 35 degrees) and smaller than the limit value (50 degrees) is exceeded in order to recognize an excessive angle abnormality. In addition, it is preferable that an angle excess signal as an abnormality prediction signal is output. In the drawing, an angle range in which such an angle excess signal is desired to be output is indicated as “OT taking too much”.

  Furthermore, in order to recognize an angle shortage abnormality, an angle (for example, 25 degrees) that is smaller than the average angle (30 to 35 degrees) of the average operating body 7 and larger than the angle (for example, 15 degrees) that outputs the ON signal. It is preferable that an angle shortage signal is output as an abnormal prediction signal when the vehicle rotates only by an angle smaller than. In the drawing, the angle range in which such an angle shortage signal is desired to be output is indicated as “OT shortage”.

  Furthermore, in order to recognize the return speed drop abnormality, a parameter indicating the speed at the time of return, for example, the return time from the time when the angle reaches 15 degrees from the position of the angle of 15 degrees or more to the time when the angle reaches 10 degrees is measured. To do. A predetermined time shorter than a time corresponding to a predetermined limit speed (recovery speed at which the next object cannot be normally detected) and longer than a normal recovery time, and a measured return time; When the return time measured is longer than the predetermined time, it is preferable to output a return speed reduction signal as an abnormal prediction signal.

  In order to output such an ON signal, an excessive angle signal, an insufficient angle signal, and a return speed decrease signal, the extraction table is stored in the memory 115 and the first to fourth threshold values are stored in the memory 117 in advance.

  Specifically, as shown in FIG. 17, the light receiving element 61 is set for the first determination unit 113-1 in the extraction table. As shown in FIG. 19A, the output voltage (digital value) from the light receiving element 61 when the operating body 7 is rotated by 10 degrees from the reference position is stored in the memory 117 as the first threshold value. It is set in advance.

  Thereby, as shown in part (b) of FIG. 19, the first determination unit 113-1 sends a HIGH signal from the light receiving element 61 when the output voltage value from the light receiving element 61 is equal to or higher than the first threshold value. When the output voltage value is less than the first threshold, a LOW signal is output. Therefore, when the HIGH signal is output from the first determination unit 113-1, the operating body 7 is at a position of 10 degrees or more, and when the LOW signal is output from the first determination unit 113-1, It can be seen that the body 7 is at a position of less than 10 degrees. It can also be seen that the angle of the operating body 7 is 10 degrees when the signal from the first determination unit 113-1 changes from LOW to HIGH, or from HIGH to LOW.

  Here, FIG. 19 is a diagram illustrating a relationship between a voltage value (digital value) output from the light receiving element, a threshold value, and a signal output from each determination unit. In FIG. 19, (a) part has shown the relationship between the voltage value output from the light receiving elements 61-64, and a threshold value, and (b) part has shown the signal output from each determination part.

  As shown in FIG. 17, the light receiving element 62 is set for the first determination unit 113-2 in the extraction table. Then, as shown in part (a) of FIG. 19, the output voltage (digital value) from the light receiving element 62 when the operating body 7 is rotated by 15 degrees from the reference position is stored in the memory 117 as the second threshold value. It is set in advance.

  Accordingly, as shown in FIG. 19C, the second determination unit 113-2 receives the HIGH signal when the output voltage (digital value) from the light receiving element 62 is equal to or higher than the second threshold. When the output voltage from the element 62 is less than the second threshold, a LOW signal is output. Therefore, when the HIGH signal is output from the second determination unit 113-2, the operating body 7 is at a position of 15 degrees or more, and when the LOW signal is output from the second determination unit 113-2, the operation is performed. It can be seen that the body 7 is at a position of less than 15 degrees. Further, it can be seen that the angle of the operating body 7 is 15 degrees when the signal from the second determination unit 113-2 changes from LOW to HIGH or from HIGH to LOW.

  In addition, as shown in FIG. 17, the light receiving element 63 is set for the third determination unit 113-3 in the extraction table. As shown in part (a) of FIG. 19, the output voltage (digital value) from the light receiving element 63 when the operating body 7 is rotated by 25 degrees from the reference position is stored in the memory 117 as the third threshold value. It is set in advance.

  Thereby, as shown in part (c) of FIG. 19, the third determination unit 113-3 receives the HIGH signal when the output voltage (digital value) from the light receiving element 63 is equal to or higher than the third threshold value. When the output voltage from the element 63 is less than the third threshold, a LOW signal is output. Therefore, when the HIGH signal is output from the third determination unit 113-3, the operating body 7 is at a position of an angle of 25 degrees or more, and when the LOW signal is output from the third determination unit 113-3, the operation is performed. It can be seen that the body 7 is at a position of less than 25 degrees. It can also be seen that the angle of the operating body 7 is 25 degrees when the signal from the third determination unit 113-3 changes from LOW to HIGH, or from HIGH to LOW.

  Finally, as shown in FIG. 17, the light receiving element 64 is set for the fourth determination unit 113-4 in the extraction table. As shown in FIG. 19A, the output voltage (digital value) from the light receiving element 64 when the operating body 7 is rotated by 40 degrees from the reference position is stored in the memory 117 as the fourth threshold value. It is set in advance.

  Thereby, as shown in part (c) of FIG. 19, the fourth determination unit 113-4 receives the HIGH signal when the output voltage (digital value) from the light receiving element 64 is equal to or higher than the fourth threshold value. When the output voltage from the element 64 is less than the fourth threshold, a LOW signal is output. Therefore, when the HIGH signal is output from the fourth determination unit 113-4, the operating body 7 is at a position of an angle of 40 degrees or more, and when the LOW signal is output from the fourth determination unit 113-4, the operation is performed. It can be seen that the body 7 is at a position of less than 40 degrees. It can also be seen that the angle of the operating body 7 is 40 degrees when the signal from the fourth determination unit 113-4 changes from LOW to HIGH or from HIGH to LOW.

  Each part of the output signal control unit 119 is set to perform the following processing.

  That is, the ON / OFF signal control unit 120 controls the ON / OFF signal output unit 103 so that the ON signal is output while the signal from the second determination unit 113-2 indicates HIGH, and It controls so that the 1 lighting part 21 is lighted. The ON / OFF signal control unit 120 controls the ON / OFF signal output unit 103 so that an OFF signal is output while the signal from the second determination unit 113-2 indicates LOW, Control is performed so that the 1 lighting section 21 is not lit.

  Here, as described above, information indicating the light receiving element 62 is set in the light receiving element identification information corresponding to the second determination unit 113-2, and the angle of the operating body 7 is 15 degrees as the second threshold value. The output voltage (digital value) of the light receiving element 62 at a certain time is set. Therefore, the operating angle at which the ON signal is output can be set to 15 degrees.

  The first abnormality signal control unit 121 checks whether the first changeover switch 36 is set to the valid mode or the invalid mode. When the first changeover switch 36 is set to the invalid mode, the first abnormality signal control unit 121 does not operate.

  On the other hand, when the first changeover switch 36 is set to the valid mode, the first abnormal signal control unit 121 executes the following processing.

  That is, the first abnormality signal control unit 121 determines that the angle excess abnormality has been detected only while the signal from the fourth determination unit 113-4 indicates HIGH, and the angle excess signal is output. The abnormality prediction output unit 105 is controlled, and the third lighting unit 25 is controlled to blink according to the first pattern.

  Here, as described above, information indicating the light receiving element 64 is set in the light receiving element identification information corresponding to the fourth determination unit 113-4, and the angle of the operating body 7 is 40 degrees as the fourth threshold value. The output voltage (digital value) of the light receiving element 64 at a certain time is set. Therefore, the angle range in which the angle excess signal is output can be 40 degrees or more.

  The second abnormality signal control unit 122 confirms whether the second changeover switch 37 is set to the valid mode or the invalid mode. When the second changeover switch 37 is set to the invalid mode, the second abnormality signal control unit 122 does not operate.

  On the other hand, when the 2nd changeover switch 37 is set to the effective mode, the 2nd abnormality signal control part 122 performs the following processes.

  That is, the second abnormal signal control unit 122 is from the time when the signal from the second determination unit 113-2 changes from LOW to HIGH to the time when the signal from the second determination unit 113-2 changes from HIGH to LOW. In the meantime, it is determined whether the signal from the third determination unit 113-3 has changed from LOW to HIGH. When the signal from the third determination unit 113-3 has not changed from LOW to HIGH, the second abnormality signal control unit 122 determines that an angle shortage abnormality has been detected, and an angle shortage signal is output. The abnormality prediction output unit 105 is controlled, and the third lighting unit 25 is controlled to blink according to the second pattern.

  Here, as described above, information indicating the light receiving element 63 is set in the light receiving element identification information corresponding to the third determination unit 113-3, and the angle of the operating body 7 is 25 degrees as the third threshold value. The output voltage (digital value) of the light receiving element 63 at a certain time is set. Therefore, the angle range in which the angle shortage signal is output can be less than 25 degrees.

  The third abnormality signal control unit 123 checks whether the third changeover switch 38 is set to the valid mode or the invalid mode. When the third changeover switch 38 is set to the invalid mode, the third abnormality signal control unit 123 does not operate.

  On the other hand, when the third changeover switch 38 is set to the valid mode, the third abnormal signal control unit 123 executes the following processing.

  First, the third abnormality signal control unit 123 stores a return speed reference time in advance. Then, the third abnormal signal control unit 123 is from the time when the signal from the second determination unit 113-2 changes from HIGH to LOW to the time when the signal from the first determination unit 113-1 changes from HIGH to LOW. Time is measured, and it is determined whether or not the measured time is longer than the return speed reference time. When the measured time is longer than the predetermined time, the third abnormality signal control unit 123 determines that the return speed decrease abnormality has been detected, and controls the abnormality prediction output unit 105 so that the return speed decrease signal is output. At the same time, the third lighting unit 25 is controlled to blink according to the third pattern.

  Here, as described above, information indicating the light receiving element 61 is set in the light receiving element identification information corresponding to the first determination unit 113-1, and the angle of the operating body 7 is 10 degrees as the first threshold value. The output voltage (digital value) of the light receiving element 61 at a certain time is set. Therefore, the return speed reduction signal can be output according to the time required for the operating body 7 to move from the angle 15 degrees to the angle 10 degrees when returning.

  The fourth abnormality signal control unit 124 checks whether the fourth changeover switch 39 is set to the valid mode or the invalid mode. When the fourth changeover switch 39 is set to the invalid mode, the fourth abnormality signal control unit 124 does not operate.

  On the other hand, when the fourth changeover switch 39 is set to the valid mode, the fourth abnormality signal control unit 124 executes the following processing.

  That is, the fourth abnormal signal control unit 124 stores a predetermined reference resistance value, and compares the predetermined resistance value with the electrical resistance value measured by the resistance measurement unit 107. When the measured electrical resistance value becomes equal to or less than the reference resistance value, the fourth abnormality signal control unit 124 determines that there is a seal abnormality and outputs an abnormality prediction output unit so that a seal failure signal is output. 105 is controlled, and the third lighting unit 25 is controlled to blink according to the fourth pattern.

  In addition, said 1st-4th pattern is a pattern from which the frequency | count of blinking, a period, etc. differ. For example, as shown in FIG. 20, the cycle is 4 seconds, and the number of blinks in one cycle is changed for each pattern.

  As described above, according to the present embodiment, the limit switch 1 outputs an excessive angle abnormality signal when the excessive angle abnormality is detected on condition that the first changeover switch 36 is set to the effective mode. On the condition that the first changeover switch 36 is set to the invalid mode, the output process of the angle excess abnormality signal is not performed. As a result, the user can switch between valid / invalid of the notification by a simple operation of switching the first changeover switch 36 according to whether or not notification of an excessive angle abnormality is desired.

  Similarly, the limit switch 1 outputs an angle shortage abnormality signal when an angle shortage abnormality is detected on the condition that the second changeover switch 37 is set to the valid mode, and the second changeover switch 37 is in the invalid mode. The output process of the angle shortage abnormality signal is not performed on the condition that it is set. As a result, the user can switch between valid / invalid of the notification by a simple operation of switching the second change-over switch 37 according to whether or not notification of an insufficient angle abnormality is desired.

  Further, the limit switch 1 outputs a return speed drop abnormality signal when the return speed drop abnormality is detected on condition that the third changeover switch 38 is set to the valid mode, and the third changeover switch 38 is disabled. If the mode is set, the return speed reduction abnormal signal output processing is not performed. As a result, the user can switch between valid / invalid of the notification by a simple operation of switching the third changeover switch 38 according to whether or not notification of a return speed decrease abnormality is desired.

  Further, on the condition that the fourth changeover switch 39 is set to the valid mode, the limit switch 1 outputs a seal failure signal when the seal abnormality is detected, and the fourth changeover switch 39 is set to the invalid mode. However, the output process of the seal failure signal is not performed. As a result, the user can switch between valid / invalid of the notification by a simple operation of switching the fourth changeover switch 39 according to whether or not notification of the seal abnormality is desired.

  Therefore, the user sets the changeover switch corresponding to the abnormality desired to be notified among the first changeover switch 36 to the fourth changeover switch 39 to be valid and sets the changeover switch corresponding to the abnormality not desired to be notified to be invalid. Only the desired abnormality can be notified. And it can prevent receiving unnecessary notification.

<Modification 1>
The present invention is not limited to the above-described embodiments, and various modifications can be made. For example, an angle condition for notifying an angle excess abnormality or an angle insufficient abnormality, and a function capable of setting and changing a detection condition for a return speed decrease abnormality or a seal abnormality may be provided. And when it is set effectively in the 1st changeover switch 36-the 4th changeover switch 39, and the output frequency of an abnormality prediction signal is higher than a predetermined value, you may perform notification which urges | hangs a setting change.

  When the output frequency of the abnormality prediction signal is higher than a predetermined value, it is expected that some measures are not taken and the same state is maintained even though the abnormality prediction signal is received. In such a state, there is a possibility that the user who has received the notification of the abnormality prediction signal has determined that no countermeasure is required because there is no particular problem. On the other hand, since the abnormality prediction signal continues to be output at a high frequency for the user, it takes time to confirm the signal. Thus, by making a notification for prompting the setting change as described above, the user can appropriately change the condition for outputting the abnormality prediction signal, and reduce unnecessary abnormality prediction signals.

  Hereinafter, such a modification will be described. For convenience of explanation, members having the same functions as those in the drawings described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

  FIG. 21 is a diagram showing the appearance of the switch module according to this modification. As shown in FIG. 21, the switch module 11a according to this modification is a setting for setting conditions for detecting various abnormalities. A button 27 is provided.

  FIG. 22 is a block diagram illustrating a functional configuration of the switch module according to the present modification. As shown in FIG. 22, the microcomputer 100 a included in the switch module 11 a according to this modification includes a mode switching unit 131 and a setting processing unit 133, and outputs signal control instead of the output signal control unit 119. The microcomputer 100 differs from the microcomputer 100 shown in FIG. 16 in that the unit 119a is provided.

  When the setting button 27 is pressed by the user, a LOW signal for switching to the setting mode is output to the microcomputer 100a. On the other hand, when the setting button 27 is not pressed, a HIGH signal is always output to the microcomputer 100a.

  When the mode switching unit 131 receives the LOW signal from the setting button 27, the mode switching unit 131 switches to the setting mode, outputs a setting instruction to the setting processing unit 133, and the first abnormality signal control unit 121 to the fourth abnormality signal control unit 124. Stop operation. Further, when the mode switching unit 131 receives a notification of setting completion from the setting processing unit 133, the mode switching unit 131 switches to the normal mode. Note that, when switching to the normal mode, the mode switching unit 131 stops the operation of the setting processing unit 133 and operates the first abnormal signal control unit 121 to the fourth abnormal signal control unit 124.

  Note that the mode switching unit 131 changes the settings related to any of the abnormalities of excess angle, insufficient angle, return speed decrease, and seal abnormality according to the number of LOW signals from the setting button 27 received within a predetermined time. Decide what to do. The mode switching unit 131 outputs a signal indicating the type of abnormality to be set to the setting processing unit 133 together with a setting instruction. For example, when the number of LOW signals is one, the mode switching unit 131 determines to change the setting related to the excessive angle abnormality.

  The setting processing unit 133 sets a condition for detecting any abnormality of excess angle abnormality, insufficient angle abnormality, return speed reduction abnormality, and seal abnormality. When the setting processing unit 133 receives the setting instruction and the signal indicating the type of abnormality from the mode switching unit 131, the setting processing unit 133 sets the abnormality indicated by the signal as the abnormality to be set and starts the setting process. Specifically, the following processing is performed.

  If the setting target is an angle excess abnormality, the setting processing unit 133 performs the following process. The setting processing unit 133 includes at least a minimum voltage (0 V) and a maximum among the ranges that can be taken from the four digital values corresponding to the light receiving elements 61 to 64 output from the A / D conversion unit 111. One digital value within a predetermined range excluding the voltage (5 V) (for example, 0.5 to 4.5 V which is a range of 10% to 90% of the maximum voltage 5 V) is extracted. When there are a plurality of light receiving elements that output a digital value within a predetermined range, if one digital value closest to the median value of the predetermined range (that is, a value indicating a voltage half the maximum voltage) is extracted. Good. Then, the setting processing unit 133 extracts the information identifying the light receiving element outputting the extracted digital value as the light receiving element identification information corresponding to the determination unit identification information indicating the fourth determination unit 113-4. Update table. In addition, the setting processing unit 133 updates the memory 117 with the extracted digital value as the fourth threshold value. When the setting processing unit 133 updates the memories 115 and 117, the setting processing unit 133 notifies the mode switching unit 131 that the setting is completed.

  When the user presses the setting button 27 in a state where the operating body 7 is moved to a desired angle at which an excess angle abnormality is detected, the output voltage value from the light receiving element in that state is set as the fourth threshold value. The As a result, when the first abnormality signal control unit 121 receives from the fourth determination unit 113-4 a HIGH signal indicating that a newly set digital value equal to or greater than the fourth threshold value is output from the light receiving element. And output an excessive angle abnormality signal. Thereby, when the operating body 7 is displaced beyond a desired angle, an excessive angle abnormality signal is output.

  When the setting target is an angle shortage abnormality, the setting processing unit 133 performs the following process. The setting processing unit 133 includes at least a minimum voltage (0 V) and a maximum among the ranges that can be taken from the four digital values corresponding to the light receiving elements 61 to 64 output from the A / D conversion unit 111. One digital value within a predetermined range excluding the voltage (5 V) (for example, 0.5 to 4.5 V which is a range of 10% to 90% of the maximum voltage 5 V) is extracted. When there are a plurality of light receiving elements that output a digital value within a predetermined range, if one digital value closest to the median value of the predetermined range (that is, a value indicating a voltage half the maximum voltage) is extracted. Good. Then, the setting processing unit 133 extracts the information for identifying the light receiving element outputting the extracted digital value as the light receiving element identification information corresponding to the determination unit identification information indicating the third determination unit 113-3. Update table. In addition, the setting processing unit 133 updates the memory 117 with the extracted digital value as the third threshold value. When the setting processing unit 133 updates the memories 115 and 117, the setting processing unit 133 notifies the mode switching unit 131 that the setting is completed.

  When the user presses the setting button 27 in a state where the operating body 7 is moved to a desired angle at which the angle shortage abnormality is detected, the output voltage value from the light receiving element in the state is set as the third threshold value. The As a result, when the second abnormality signal control unit 122 does not receive from the third determination unit 113-3 a HIGH signal indicating that a digital value not less than the newly set third threshold value is output from the light receiving element. The angle shortage abnormality signal is output. Thereby, when the operating body 7 is not displaced to a desired angle, an angle shortage abnormality signal is output.

  In addition, when the setting target is a return speed drop abnormality, the setting processing unit 133 performs the following process. The setting processing unit 133 changes the signal from the first determination unit 113-1 from HIGH to LOW from the time when the signal from the second determination unit 113-2 changes from HIGH to LOW for a predetermined period (for example, 30 minutes). Measure the time up to the point in time, and find the average value of the time. Then, the setting processing unit 133 uses the value obtained by multiplying the average value by a predetermined multiple (for example, 1.3 times) as a new return speed reference time, and the return speed reference time stored in the third abnormality signal control unit 123. Update. Further, when the setting processing unit 133 updates the return speed reference time, the setting processing unit 133 notifies the mode switching unit 131 that the setting is completed.

  The user presses the setting button 27 while repeating the normal operation in which the object contacts the operating body 7, whereby the average value of the return speed in the normal operation is measured. A value obtained by multiplying the average value by a predetermined multiple is automatically updated as the return speed reference time. As a result, even when the return speed is changed as when the production line is changed, the return speed reference time suitable for the new production line is set. Thereby, it is possible to prevent an unnecessary return speed reduction signal from being output.

  When the setting target is a seal abnormality, the setting processing unit 133 performs the following process. The setting processing unit 133 obtains an average value of resistance values, which are measurement results by the resistance measuring unit 107, for a predetermined period (for example, 30 minutes). Then, the setting processing unit 133 updates the reference resistance value stored in the fourth abnormal signal control unit 124 using a value obtained by multiplying the average value by a predetermined multiple (for example, 0.7 times) as a new reference resistance value. To do. In addition, when the setting processing unit 133 updates the reference resistance value, the setting processing unit 133 notifies the mode switching unit 131 that the setting is completed.

  The user presses the setting button 27 to measure the average resistance value in the environment where the limit switch 1 is installed. A value obtained by multiplying the average value by a predetermined multiple is automatically updated as the reference resistance value. As a result, a reference resistance value corresponding to the installation environment is set.

  The output signal control unit 119a is different from the output signal control unit 119 shown in FIG.

  The notification processing unit 125 measures the output frequency of the abnormality prediction signal, and controls the abnormality prediction output unit 105 so as to output a signal for prompting a setting change according to the output frequency.

  Specifically, the notification processing unit 125 outputs the number of times of an excessive angle abnormality signal, an insufficient angle abnormality signal, a return speed reduction signal, and a seal failure signal within a predetermined period (for example, a period from 24 hours before to the present time). Measure.

  When the number of output of the angle excess abnormality signal within the predetermined period reaches the predetermined number N1 (predetermined frequency) or more, the notification processing unit 125 abnormally outputs a signal that prompts the setting change of the condition for detecting the angle excess abnormality. The prediction output unit 105 is controlled.

  Further, the notification processing unit 125 outputs a signal that prompts the user to change the setting of the condition for detecting the angle shortage abnormality when the number of output of the angle shortage abnormality signal within the predetermined period reaches the predetermined number N2 (predetermined frequency) or more. Then, the abnormality prediction output unit 105 is controlled.

  In addition, the notification processing unit 125 outputs a signal that prompts the setting change of the condition for detecting the return speed decrease abnormality when the output number of the return speed decrease signal within the predetermined period reaches the predetermined number N3 (predetermined frequency) or more. Thus, the abnormality prediction output unit 105 is controlled.

  Further, the notification processing unit 125 abnormally outputs a signal that prompts the user to change the setting of the condition for detecting the seal abnormality when the number of output of the seal failure signal within the predetermined period reaches the predetermined number N4 (predetermined frequency) or more. The prediction output unit 105 is controlled.

  Thereby, the user can be prompted to change the setting by pressing the setting button 27.

<Modification 2>
The first changeover switch 36 to the fourth changeover switch 39 may be capable of switching to the automatic changeover mode in addition to the valid mode and the invalid mode. The automatic switching mode is a mode for automatically switching from the valid mode to the invalid mode when the output frequency of the abnormality prediction signal is higher than a predetermined value.

  When the output frequency of the abnormality prediction signal is higher than a predetermined value, it is expected that some measures are not taken and the same state is maintained even though the abnormality prediction signal is received. In such a state, there is a possibility that the user who has received the notification of the abnormality prediction signal has determined that no countermeasure is required because there is no particular problem. On the other hand, since the abnormality prediction signal continues to be output at a high frequency for the user, it takes time to confirm the signal. Therefore, as described above, when the output frequency of the abnormality prediction signal is higher than the predetermined value, it is possible to save the trouble of checking the unnecessary abnormality prediction signal by automatically switching from the valid mode to the invalid mode.

  Hereinafter, such a modification will be described. For convenience of explanation, members having the same functions as those in the drawings described in the embodiment are given the same reference numerals, and descriptions thereof are omitted.

  FIG. 23 is a block diagram illustrating a functional configuration of the switch module according to the present modification. As shown in FIG. 23, the switch module 11b according to the present modification includes a first changeover switch 36b to a fourth changeover switch 39b instead of the first changeover switch 36 to the fourth changeover switch 39, and Instead, it differs from the switch module 11 shown in FIG. 16 in that it includes a microcomputer 100b. Further, the microcomputer 100b according to this modification differs from the microcomputer 100 shown in FIG. 16 in that an automatic switching unit (switching unit) 141 is provided.

  The first changeover switch 36b to the fourth changeover switch 39b are switches that can be set to any one of three types of modes, an effective mode, an invalid mode, and an automatic mode. Thereby, the user can set to any desired mode.

  When the first changeover switch 36b to the fourth changeover switch 39b are set to the effective mode, the automatic changeover unit 141 indicates that the first changeover switch 36b to the fourth changeover switch 39b are in the effective mode. Output to. In addition, when the first changeover switch 36b to the fourth changeover switch 39b are set to the invalid mode, the automatic changeover unit 141 controls the output signal to indicate that the first changeover switch 36b to the fourth changeover switch 39b are in the invalid mode. Output to the unit 119.

  On the other hand, when the first changeover switch 36b to the fourth changeover switch 39b are set to the automatic mode, the automatic changeover unit 141 detects the excessive angle abnormality signal within a predetermined period (for example, a period from 24 hours before to the present time). The number of outputs of each of the angle shortage abnormality signal, the return speed reduction signal, and the seal failure signal is measured.

  Then, the automatic switching unit 141 notifies the output signal control unit 119 that the first changeover switch 36b is in the invalid mode when the number of output of the angle excess abnormality signal within the predetermined period is equal to or greater than the predetermined number N1 (predetermined frequency). Output. The automatic switching unit 141 outputs to the output signal control unit 119 that the first changeover switch 36b is in the effective mode when the output number of the angle excess abnormality signal within the predetermined period is less than the predetermined number N1.

  Similarly, the automatic switching unit 141 indicates that the second changeover switch 37b is in the invalid mode when the number of output of the angle shortage abnormality signal within the predetermined period is equal to or greater than the predetermined number N2 (predetermined frequency). Output to. Further, when the number of output of the angle shortage abnormality signal within the predetermined period is less than the predetermined number N2, the automatic switching unit 141 outputs to the output signal control unit 119 that the second changeover switch 37b is in the effective mode.

  Further, the automatic switching unit 141 notifies the output signal control unit 119 that the third changeover switch 38b is in the invalid mode when the number of times of output of the return speed decrease signal within the predetermined period is equal to or greater than the predetermined number N3 (predetermined frequency). Output. Further, when the number of times the return speed decrease signal is output within the predetermined period is less than the predetermined number N3, the automatic switching unit 141 outputs to the output signal control unit 119 that the third changeover switch 38b is in the effective mode.

  Further, the automatic switching unit 141 outputs to the output signal control unit 119 that the fourth changeover switch 39b is in the invalid mode when the number of output of the seal failure signal within the predetermined period is equal to or greater than the predetermined number N4 (predetermined frequency). To do. Further, when the number of output of the seal failure signal within the predetermined period is less than the predetermined number N4, the automatic switching unit 141 outputs to the output signal control unit 119 that the fourth changeover switch 39b is in the effective mode.

  According to this modification, when the output frequency of the abnormality prediction signal is higher than a predetermined value, it is possible to save the trouble of checking the unnecessary abnormality prediction signal by automatically switching from the valid mode to the invalid mode.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different forms are also included. It is included in the technical scope of the present invention.

  The present invention can be used for a limit switch used in a production line or the like.

1 Limit switch (switch)
3 Casing (housing)
7 Actuator 11, 11a, 11b Switch module 35 Switch part (switching part)
36, 36b 1st changeover switch (switching part)
37, 37b Second changeover switch (switching part)
38, 38b Third changeover switch (switching part)
39, 39b Fourth changeover switch (switching part)
100, 100a, 100b Microcomputer 103 ON / OFF signal output unit (ON / OFF signal output unit)
105 Abnormal prediction output unit (abnormal signal output unit)
107 Resistance measurement unit 113 Position detection unit 119, 119a Output signal control unit (abnormal signal output unit)
120 ON / OFF signal control unit (ON / OFF signal output unit)
121 1st abnormal signal control part (abnormal signal output part)
122 2nd abnormal signal control part (abnormal signal output part)
123 3rd abnormal signal control part (abnormal signal output part)
124 4th abnormal signal control part (abnormal signal output part)
125 Notification processing unit 133 Setting processing unit 141 Automatic switching unit (switching unit)

Claims (8)

An actuating body that is displaced according to the load of an external force;
An on / off signal output unit that outputs either an on signal or an off signal according to the displacement of the operating body;
The on / off signal output unit is a switch disposed inside the housing,
An abnormality signal output unit having a function of outputting an abnormality signal indicating that an abnormality has occurred when an abnormality is detected;
A switch comprising: a switching unit that switches between an effective mode that enables the function of the abnormal signal output unit and an invalid mode that disables the function of the abnormal signal output unit. The abnormal signal output unit detects a plurality of types of abnormalities,
The abnormal signal output unit outputs an abnormal signal indicating that the detected type of abnormality has occurred when detecting any of the plurality of types of abnormalities,
The switch according to claim 1, wherein the switching unit switches each of the plurality of types of abnormalities to either the valid mode or the invalid mode. The operating body stops at a predetermined reference position when there is no external force load,
A position detection unit for detecting a displacement amount from the reference position in the operating body;
The on / off signal output unit outputs an on signal when the displacement detected by the position detector is equal to or greater than a predetermined first displacement,
The abnormal signal output unit has an increased displacement when the displacement detected by the position detector is larger than a predetermined second displacement greater than the first displacement. 3. The switch according to claim 1, wherein an abnormality indicative of the error is detected. The operating body stops at a predetermined reference position when there is no external force load,
A position detection unit for detecting a displacement amount from the reference position in the operating body;
The on / off signal output unit outputs an on signal when the displacement detected by the position detector is equal to or greater than a predetermined first displacement,
The abnormal signal output unit has a small displacement amount when the maximum displacement amount detected by the position detection unit is larger than the first displacement amount and smaller than a predetermined third displacement amount. The switch according to claim 1, wherein an abnormality indicating that the switch has come is detected. The operating body stops at a predetermined reference position when there is no external force load,
The abnormal signal output unit has a predetermined return speed of the working body when the working body is returned to the reference position after the working body is displaced by an external force load and the external force load disappears. 3. The switch according to claim 1, wherein an abnormality indicating that the return speed is lowered is detected when the speed is lower than the reference speed.   The switch according to claim 1, wherein the abnormality signal output unit detects an abnormality indicating that water has entered the housing. A setting processing unit for setting conditions when the abnormal signal output unit detects an abnormality,
2. A notification processing unit that outputs a notification for prompting setting by the setting processing unit when the frequency of the abnormal signal output by the abnormal signal output unit is equal to or higher than a predetermined frequency. The switch according to any one of 6. In addition to the valid mode and invalid mode, the switching unit can be switched to an automatic mode that automatically switches between valid and invalid of the function of the abnormal signal output unit,
When the automatic mode is set, the switching unit invalidates the function of the abnormal signal output unit when the frequency of the abnormal signal output by the abnormal signal output unit is equal to or higher than a predetermined frequency, and outputs the abnormal signal. The switch according to any one of claims 1 to 7, wherein the function of the abnormal signal output unit is validated when the frequency of the abnormal signal output by the unit is less than a predetermined frequency.

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