JP2024024878A - safety switch - Google Patents

Abstract

[Problem] To suppress interference with workers. A safety switch (100) includes a switch body (104) equipped with an electromagnet (130) and an actuator (104) that is attracted to the electromagnet (130). The switch body (104) has a drive control section and a safety control section that control the safety switch (100), and the drive control section and safety control section are surrounded by a housing (Hg). The housing (Hg) is arranged on the back side of the electromagnet (130) of the switch body (102), and the housing (Hg) forms a housing part (132) that houses the drive control section and the safety control section. ing. [Selection diagram] Figure 8

Description

The present invention relates to safety switches.

In an environment in which a device is operated, if a human body can freely touch the device, there is a risk that the device may pose a danger to the human body. In the environment in which equipment is operated, protective fences and partition panels are used to prevent the equipment from causing harm to humans, in other words, to ensure a safe state. Divide the area. One way to achieve a safe state by dividing the operating area is to partition the operating area with fixed parts such as protective fences to prevent human bodies from entering the operating area. This is a method of isolating it from the area where it will be used. Another method is to construct a partition system that can partition the operating area and limit the operation of the device. In a compartmentalization system, the working area is divided by a fixed part such as a protective fence, and then an opening is provided in a part of the partition so that workers can access the working area, and a movable part is used to open and close this opening. There will be a section where the and will be installed, that is, a section will be created that will allow workers to enter the working area. In a partition system, a control system is constructed to monitor movable parts and, based on the monitoring results, control devices operating in the operating area so as not to cause harm to the human body. In such compartmental systems, a safety switch is installed in the area of the opening in which the movable part is installed, which monitors the opening and closing of the movable part.

The safety switch is composed of a switch body placed in a fixed part of the compartment and an actuator placed in an opening/closing door that constitutes a movable part of the compartment. As a function to maintain the operating area in a safe state, the safety switch detects and outputs when a door, which is a moving part, is opened. Control the equipment so that it does not cause any harm to the human body. Safety measures for the environment in which the device operates can be taken by configuring the system to, for example, stop the device in the operating area or reduce the operating speed of the device in response to the output from the safety switch.

As a type of safety switch, a safety switch with a lock pin mechanism is disclosed in Patent Document 1. A safety switch with a lock pin mechanism has an actuator bolt installed in a compartment fixing part and a switch body installed in a door, and a lock pin is provided in the switch body. The actuator bolt and the switch body are arranged in relative positions facing each other when the door is closed. In the lock pin mechanism, mechanical engagement of the lock pin with the actuator bolt creates a locked state in which the actuator bolt and the lock pin are physically integrated. The safety switch with a lock pin mechanism is provided with a detection mechanism that can detect that the safety switch with a lock pin mechanism is in the locked state, and outputs an output indicating that the safety switch is not in the locked state at least when it is not in the locked state. By closing the door and locking the lock pin mechanism, the closed door is fixed integrally with the fixed portion of the compartment. Conversely, by removing the lock pin from the actuator bolt, an unlocked state is established and the door can be opened.

Patent Document 2 discloses a safety switch with an electromagnetic locking mechanism, which is another type of safety switch. That is, the safety switch with an electromagnetic locking mechanism includes an electromagnet and an actuator magnetization member that is attracted to the electromagnet. An actuator magnetization member is installed on a door constituting a movable part, while a switch body including an electromagnet is installed on a partition fixed part such as a guard fence. The door is locked by driving the electromagnet and attracting the actuator magnetized member. The safety switch is equipped with a display. The display section displays the safety status of the operating area.

The safety switch with an electromagnetic locking mechanism disclosed in Patent Document 2 prevents a worker from restarting the machine when receiving a "door closed" signal by misunderstanding that the operating area is safe, that is, there is no one inside the operating area. This lock lever has a lock lever that the worker operates to ensure that the work area is kept safe in some way. From that point on, it can be determined that it is safe as long as the "door closed" signal is output. Once the door is opened, it is unclear whether it is safe or not even if a "door closed" signal is output afterwards.

Patent Document 2 also discloses a module that includes a monitoring sensor and a monitoring actuator to monitor the opening and closing of a door. The monitoring actuator is installed on the opening/closing door, while the monitoring sensor is installed on the compartment fixing part. As the movable part of the door opens and closes, the monitoring actuator moves away from or approaches the monitoring sensor, and the monitoring sensor sends a first state signal indicating that the door is open or a second state that indicates that the door is closed. Generate door signals including signals.

Japanese Patent Application Publication No. 2019-183541 Special table 2016-510382 publication

As described above, in safety measures using safety switches, safety switches are installed near openings through which people enter and exit mainly for purposes such as work. Therefore, the safety switch is a nuisance for workers. For example, when placing a safety switch in a fixed part of the compartment outside the operating area, there is an advantage that the display of the safety switch can be easily checked by a worker outside the operating area, but regardless of the position of the opening/closing door. Since the safety switch protrudes outward from the compartment fixing part, it becomes a nuisance for workers. On the other hand, if the safety switch is placed inside the operating area, the reduction in work efficiency due to the safety switch protruding outside from the compartment fixing part is eliminated, but the work efficiency when opening the opening/closing door is reduced. . More specifically, if the safety switch is placed inside the operating area, the switch body needs to be placed close to the actuator placed on the opening/closing door when the door as a moving part of the compartment is closed. For this reason, the switch body is placed in such a position that it occupies an area that functions as a door opening when the door is opened. For this reason, the safety switch, including the switch body, causes a narrowing of the area of the door opening in which the moving parts are located, so that the safety switch becomes obstructed when the moving parts are opened, i.e. when working through the door opening. There is a possibility that it will become. Furthermore, when the safety switch is placed inside the operating area, the safety switch is located in the area of the opening. When the operator looks into the operating area from the outside, there is a risk that the switch body may be difficult for the operator to see.

SUMMARY OF THE INVENTION An object of the present invention is to provide a safety switch with an electromagnetic locking mechanism that can prevent interference with workers.

According to the present invention, the above technical problem is solved.
A safety switch in which an actuator having a magnetized member on which an attracted surface is formed is installed so as to be movable relative to the switch body,
a detection unit that detects that the actuator is within a predetermined range with respect to the switch body;
an electromagnet having a front side formed with an attraction surface corresponding to the attraction surface of the actuator;
a lock input section receiving a lock signal for locking relative movement of the actuator;
a drive control unit that drives the electromagnet so that the attraction surface and the attraction surface are attracted to each other based on the lock signal received by the lock input unit;
a safety control unit that generates a safety signal based on detection by the detection unit;
This is achieved by providing a safety switch that includes, on the back side of the electromagnet, a casing that forms an accommodating section that accommodates the drive control section and the safety control section.

According to the present invention, since the board accommodating portion is located on the side opposite to the attraction surface with respect to the electromagnet, the presence of the switch body, which is a factor that narrows the area of the opening where the partition movable portion is installed, can be reduced. Can be done. Furthermore, when viewed from outside the compartment, the switch body appears small. In other words, since the board accommodating part of the switch body located inside the operating area is located in a position where the suction surface moves away from the suction surface when viewed from the outside, when an operator looks into the operating area from the outside, The switch itself looks small.

The advantages and other objects of the present invention will become apparent from the following detailed description of preferred embodiments of the present invention.

FIG. 2 is a front view of a protective fence and an opening/closing door equipped with a safety switch according to an embodiment. The safety switch consists of a safety switch with an electromagnetic locking mechanism. 2 is a sectional view taken along line II-II in FIG. 1. FIG. FIG. 2 is a diagram for explaining a box-shaped device to which the present invention can be applied. FIG. 2 is a perspective view of an actuator that is one component of the safety switch of the embodiment. FIG. 2 is a perspective view of the switch body, which is another component of the safety switch according to the embodiment, as seen diagonally from the front and from above. 6 is a front view of the switch body shown in FIG. 5. FIG. FIG. 6 is a side view of the switch body shown in FIG. 5; 6 is a longitudinal sectional view taken along the center line of the switch body shown in FIG. 5. FIG. FIG. 6 is a diagram with the casing removed from the switch body shown in FIG. 5; FIG. 6 is an explanatory diagram of the electromagnet and the casing of the switch body shown in FIG. 5 separated from each other and viewed diagonally from the rear. FIG. 2 is a perspective view of a safety switch installed in the door opening frame of the protective fence and the door frame of the opening/closing door, as seen from the outside of the opening/closing door. It is a figure for explaining the effect regarding arrangement|positioning of the display part of the safety switch of an Example. FIG. 2 is a block diagram for explaining the electrical configuration of a switch body included in the embodiment. 14 is a functional block diagram of the first MCU illustrated in FIG. 13. FIG. 14 is a functional block diagram of the second MCU illustrated in FIG. 13. FIG. FIG. 3 is a diagram for specifically explaining a display mode of display. FIG. 3 is a diagram for explaining a preferable arrangement position of a display section. FIG. 3 is a diagram for explaining a method for determining whether or not a piece of iron is in close contact with an electromagnet. FIG. 3 is a longitudinal sectional view of the actuator of the safety switch according to the embodiment. FIG. 19 is a diagram related to a compression coil spring included in the actuator shown in FIG. 19, in which (I) is a plan view, (II) is a side view of the compression coil spring in an unloaded state, and (III) is a compression coil spring that is crushed by applying a compression force. FIG. 3 is a side view of the compression coil spring in a closed state. In the safety switch of the example, it is a diagram for explaining the process of matching the orientation of the suction surface and the orientation of the suction surface, (I) shows the standby state of the actuator when the door is opened, and (II) ) indicates the state in which the attracted surface advances toward the attracted surface under the attractive force of the permanent magnet when the actuator approaches the electromagnet in the process of closing the door, and (III) indicates the state in which the attracted surface advances toward the attracted surface under the attractive force of the permanent magnet. The figure below shows a state where the suction surface is in close contact with the suction surface. 21 is a diagram for explaining the state change of the actuator shown in FIG. 20, (I) is a diagram with the attracted surface, that is, the iron piece is located in the retreat position, and (II) is a diagram with the iron piece located in the advanced position. (III) is a diagram in which the iron piece is in the advanced position and is in a tilted state to establish a state parallel to the attracting surface of the electromagnet. Explaining the technical meaning of arranging the sensor side coil at a location where leakage of magnetic flux is suppressed by providing a protrusion that protrudes radially outward on a part of the cylindrical outer surface of the yoke part in the switch body included in the example. FIG. 3 is a bottom view of the switch body viewed from the direction of looking into the suction surface. 24 is a cross-sectional view of the sensor body taken along line XXIV-XXIV in FIG. 23. FIG. //Describe the gap Gp as you would any other dimension. Even if it is illustrated in a diagram other than Figure 24 (for example, Figure 5, Figure 6, Figure 23), it is difficult to understand what is being shown. This is a diagram for explaining that the sensor-side coil is adversely affected by the magnetic flux leaking from the cylindrical switch body with a circular attraction surface in the switch body of the comparative example, and the comparison example is shown from the direction of looking into the attraction surface. FIG. 3 is a bottom view of the switch body. 26 is a cross-sectional view of a sensor main body of a comparative example taken along line XXVI-XXVI in FIG. 25. FIG. FIG. 2 is a diagram schematically representing the installation structure of a switch body installed in a door opening frame. FIG. 28 is a schematic diagram corresponding to FIG. 27 for explaining a first modification of the installation structure of the switch body. FIG. 28 is a schematic diagram corresponding to FIG. 27 for explaining a second modification of the installation structure of the switch body.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory diagram of an opening/closing door and a protective fence in which a safety switch with an electromagnetic locking mechanism of an embodiment is installed as a partition system 1. FIG. 2 is a cross-sectional view taken along line II-II in FIG. In the figure, reference numeral PF indicates a protective fence, and reference numeral PD indicates an opening/closing door. FIG. 1 is an explanatory diagram when the partition system 1 is viewed from outside the operating area S partitioned by the partition system 1. The compartment system 1 includes a protective fence PF as a fixed compartment part, a door PD that constitutes a movable part movable with respect to the fixed part, and a safety switch 100. The partition system 1 maintains the operating area S in a safe state by restricting the operation of devices inside the operating area S based on the safety-related output output by the safety switch 100. In this embodiment, the safety switch 100 is placed within the operating area S. The protective fence PF constitutes a partition fixed part of the partition system 1 that partitions the operating area S in which the device operates. An opening in which a door PD, which constitutes a movable part with respect to a partition fixed part, is installed is formed by a door opening frame 2. Referring to FIG. 1, a plurality of vertically spaced hinges 4 are provided on one side of the door PD constituting a movable part, and the vertical frame portion 2a of the door opening frame 2 is connected to the vertical frame portion 2a of the door opening frame 2 via the plurality of hinges 4. installed. That is, the door PD is a single-opening door.

Referring to FIGS. 1 and 2, the door PD includes a door frame 6 and a transparent board 8 surrounded by the door frame 6. The door PD has the hinge 4 attached to one side thereof, and the door operating section 10 attached to the other side (FIG. 1). By operating the door operation unit 10, a door latch (not shown) that engages and disengages from the door opening frame 2 is released, and the door PD can be opened.

FIG. 2 shows a state in which the door PD is closed, and the door frame 6 constituting the door PD is in contact with the door stopper 110 and positioned. In FIG. 2, the operating area S defined by the protective fence PF and the opening/closing door PD is an area located on the right side of the protective fence PF and the door PD on the paper of FIG. A safety switch 100 is arranged on the operating area S side in relation to the door PD in the closed state. By arranging the safety switch 100 so as to be located on the operation area S side with respect to the door PD with the door PD closed, the safety switch 100 is arranged inside the operation area S. Referring to FIG. 2, safety switch 100 includes a switch body 102 and an actuator 104. The switch body 102 is fixed to the surface of the upper horizontal frame portion 2b of the door opening frame 2 on the operating area S side via a first bracket 106. The switch body 102 includes an electromagnet 130 having an attraction surface 130a. In a state where the door PD is closed, the switch body 102 is installed in the door opening frame so that the suction surface 130a faces the door PD, in other words, faces the outside of the operating area S. Note that although arrows X, Y, and Z indicating three mutually orthogonal directions are illustrated in FIG. 2, they correspond to the orientation of the safety switch 100, as will be described later.

The switch body 102 of the safety switch 100 of the embodiment includes an electromagnet 130 (FIG. 8) and a board accommodating part 132, as will be explained later with reference to FIG. ), Cb(2) (FIGS. 8 and 9) are accommodated.

On the other hand, the actuator 104 is arranged on the surface of the door frame 6 on the operating area S side, and specifically, is fixed to the upper frame portion 6a of the door frame 6 via the second bracket 108 (FIG. 2). Both the door opening frame 2 and the door frame 6 have a closed rectangular cross section, which is a well-known structure, but as a modification, they may have a U-shaped cross section or an L-shaped cross section.

Door PD is related to the opening/closing door described in Patent Document 2. On the other hand, FIG. 3 shows a box-like device 500 containing a working system. In FIG. 3, three devices 500 are arranged side by side. A double door opening/closing door 506, which is an example of a door PD, is attached to the box 502 of each device 500 so that an operator can manually access the device 504 installed inside the box 502. A safety switch 100 can be installed in the box-like device 500 in connection with the opening/closing door 506.

Hereinafter, as a typical example, an embodiment of the present invention will be described based on an embodiment applied to a door PD disclosed in FIGS. 1 and 2. FIG. 4 is a substantial front view of the actuator 104 included in the safety switch 100, and is a diagram for explaining the front shape of the actuator 104. The actuator 104 is mainly composed of an iron piece 120 that is a magnetized member, and includes a plastic molded product 122, an actuator communication section 124, and a mounting bracket 126. The iron piece 120 has a circular shape when viewed from the front, and has a suction surface 130a and a suction surface 120a on the front surface. The diameter of the iron piece 120 is indicated by reference numeral D1. Iron piece 120 is attached to plastic molding 122. The periphery of the iron piece 120 is covered with a plastic molded product 122, and an actuator communication section 124 is arranged in a manner that it is covered and hidden by this plastic molded product 122. The mounting bracket 126 is provided on the opposite side of the iron piece 120 with respect to the plastic molded product 122, and has a shape extending left and right on the paper surface of FIG. The mounting bracket 126 is provided with a pair of mounting holes in a portion visible from the front of the actuator 104, into which screws for fastening the mounting bracket are inserted. The pair of fittings 126 are fastened to the second bracket 108, and the actuator 104 is fixed to the door PD via the second bracket 108 (FIG. 2). When the door PD is closed, the relative positional relationship between the actuator 104 and the switch body 102 is such that the actuator 104 is located on the surface of the door frame 6 on the operating area S side. That is, the actuator 104 is installed on the door frame 6 so that the attracted surface 120a of the iron piece 120 faces the operating area S when the door PD is closed. On the other hand, the switch body 102 is located inside the operating area S. In this embodiment, the actuator 104 is fixed to the door PD via the second bracket 108, but the mounting bracket 126 is directly fastened to the door frame 6 and the actuator 104 is fixed to the door PD. It's okay.

An example of arrangement when fixing the actuator 104 to the door PD will be specifically described based on the example of arrangement shown in FIG. 2. The actuator 104 is fixed to the upper frame portion 6a of the door frame 6, as described above. In this embodiment, the pair of mounting fittings 126 of the actuator 104 are fixed in such a way that the mounting holes are lined up laterally, that is, in the longitudinal direction of the upper frame portion 6a. In this installation example, reference numeral Ha in FIG. 4 indicates the height of the iron piece 120 that is included in the actuator 104 and has a circular shape when viewed from the front. In the installation example shown in FIG. 2, the actuator 104 is fixed to the door frame 6 with the height Ha aligned with the width Wdf of the upper frame 6a. The height Ha of the actuator 104 is equal to or smaller than the average width Wdf of the door frame 6 having a rectangular cross section (FIG. 2). A portion of the actuator 104 installed on the door frame 6 may protrude to the inside of the door frame 6, that is, to the transparent board 8, but the amount of protrusion is preferably as small as possible. Thereby, it is possible to reduce the presence of the actuator 104 from interfering with work.

In the safety switch 100 of this embodiment, the electromagnet 130 of the switch body 102 and the iron piece 120 of the actuator 104 function as an electromagnetic locking mechanism. As described above, electromagnetic locking mechanisms for safety switches have historically been developed following the technical idea of locking pin mechanisms. The design concept of a safety switch 100 with an electromagnetic locking mechanism according to an embodiment will be explained. Generally speaking, when considering the role of a safety switch, the essential requirement to maintain a safe environment in the operating area where operating equipment is located is to detect the opening and closing of a door. The role required of the door lock function is to keep the device operating in the operating area. Therefore, it can be said that the door lock function is sufficient as long as it can realize the continued operation of the device in the operating area. In other words, the basic requirement for the door lock function of a safety switch is to prevent the door from being opened inadvertently while the device is in operation. This is because if the opening/closing door is opened inadvertently, the operation of the device in the operating area is restricted by the function of the safety switch for maintaining the operating area in a safe environment. In other words, the safety switch is required to prevent the operation of the device in the operation area S (FIG. 2) or the box 502 (FIG. 3) from being interrupted due to the careless opening of the door PD, 506. This can be said to be the essential role of the lock function.

Conventionally, the door lock function of a safety switch is designed to also contribute to maintaining a safe environment in the operating area. For this reason, the electromagnetic locking mechanism also uses an electromagnet with a strong magnetic force that prevents the door from being opened even with a relatively strong operating force. However, if the role of the door lock function is not to maintain a safe environment but to keep the device operating, the level of magnetic force of the electromagnet used in safety switches with electromagnetic locking mechanism is The magnetic force may be the same as that, but the magnetic force may be weaker than this. When a worker performs an operation to open a door PD, at least the operator should be able to understand the operating force required to open the door PD by saying, ``You are currently performing the operation to open the door PD, but it is not according to your intention.'' By requiring workers to have the operational strength to ask "Is there a door?", it is possible to prevent the door from being opened inadvertently. By using an electromagnet to obtain a certain operating force that can confirm the operator's intention to open the door PD, it is possible to prevent the door PD from being opened inadvertently without requiring a greater operating force.

Therefore, although it is optional, the degree of magnetic force of the electromagnet 130 may be made weaker than before, for example, if the door PD is equipped with an operation part such as a doorknob, and an operation force for rotating the doorknob is applied to the doorknob. The door latch is released using an electromagnet 130 whose magnetic force is at least stronger than the operating force used to release the door latch. Thereby, the operator can be discouraged from opening the door PD, and the careless opening of the door PD can be prevented. Further, it is possible to avoid an unexpected interruption in the operation of the device that occurs due to the careless opening of the door PD.

Referring to FIG. 5, the switch body 102 has a screw hole 130c as a mounting part for fixing the switch body 102 to the door opening frame 2, which is a fixed part of the partition system 1. More specifically, the electromagnet 130 has a protrusion 130b that protrudes outward from the center of the attraction surface 130a, and a screw hole 130c is provided in the protrusion 130b. Explaining the arrangement example shown in FIG. 2, the switch body 102 is fixed to the upper horizontal frame portion 2b of the door opening frame 2 via a first bracket 106 having an L-shaped cross section (FIG. 2). Explaining the arrangement example in FIG. 2, the protrusion 130b is positioned protruding above the electromagnet 130, the flat top surface of the protrusion 130b constitutes a mounting surface, and a screw hole 130c is provided in the mounting surface. . This mounting surface may be formed on the side surface of the electromagnet 130.

For example, FIG. 5 shows arrows X, Y, and Z indicating three mutually orthogonal directions. The directions indicated by the arrows X, Y, and Z all correspond to the orientation of the safety switch 100, and the directions indicated by the arrows X, Y, and Z are referred to as the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively. The Y-axis direction indicates the normal direction of the attraction surface 130a of the electromagnet 130. The Z-axis direction is perpendicular to the Y-axis direction, parallel to the suction surface 130a, and indicates a direction in which the protruding portion 130b projects with respect to the center of the suction surface 130a. The X-axis direction indicates a direction parallel to the suction surface 130a and orthogonal to the Z-axis. As shown in FIG. 2, the safety switch 100 of this embodiment is arranged such that the suction surface 130a faces the door PD in the closed state, so that the normal direction of the door PD in the closed state is Y. Coincident in the axial direction. Furthermore, in the safety switch 100 of the present embodiment, the direction in which the protruding portion 130b protrudes with respect to the center of the suction surface 130a is the extending direction of the upper side frame portion 6a of the door PD in the closed state, or the upper side of the door opening frame 2. It is arranged so as to be orthogonal to the extending direction of the horizontal frame portion 2b. Therefore, in this embodiment, the extending direction of the upper frame portion 6a and the extending direction of the upper horizontal frame portion 2b coincide with the X-axis direction, and the direction toward the operating area S with respect to the door PD, i.e. The depth direction of the operating area S coincides with the Y-axis direction. In the following description, in the Y-axis direction, the direction from the closed door PD to the suction surface 130a is referred to as "backward", the opposite direction is referred to as "front", and in the Z-axis direction, the protrusion from the suction surface 130a is referred to as "backward". The direction toward 130b is sometimes called "upward," and the direction opposite is sometimes called "downward."

5 to 10 are diagrams regarding the switch body 102. FIG. FIG. 5 is a perspective view of the switch body 102. FIG. 6 is a front view. FIG. 7 is a side view. As best seen from FIG. 7, the switch body 102 has a substantially cylindrical shape extending in the Y-axis direction. The switch body 102 has an electromagnet 130 including an attraction surface 130a that constitutes one end surface on the front side in the Y-axis direction. The suction surface 130a constitutes the main part of the front end surface of the switch body 102. Specifically, one end surface of the switch body 102 is configured with a suction surface 130a. As described above, the suction surface 130a faces the door PD when the door PD is closed.

As shown in FIG. 5, the switch body 102 includes a casing Hg that includes a board accommodating portion 132 that accommodates a board, and a display that displays a display corresponding to the safety-related output output from the safety switch 100 based on the detection result of the actuator 104. 142. A connecting portion is formed on the back side of the electromagnet 130, that is, on the side opposite to the attraction surface 130a in the Y-axis direction, and the electromagnet 130 and the housing Hg are connected by the connecting portion. The substrate accommodating portion 132 is located on the opposite side to the attraction surface 130a of the electromagnet 130 in the Y-axis direction. In other words, the substrate housing section 132 is located behind the electromagnet 130 or on the back side of the electromagnet 130. Therefore, the dimensions of the entire switch body 102 in the X-axis direction and the Z-axis direction are less likely to become larger than the dimensions of the electromagnet 130 in the X-axis direction and the Z-axis direction. Further, the display section 142 is located on the side of the housing Hg opposite to the attraction surface 130a with respect to the electromagnet 130 in the Y-axis direction. The switch body 102 has a shape in which the dimension in the Y-axis direction is larger than both the dimension in the X-axis direction and the dimension in the Z-axis direction. Therefore, compared to other switch bodies that require a similar capacity, the area occupied by the opening formed in the door opening frame 2 tends to be smaller when viewed from the front.

FIG. 6 is a front view of the switch body 102 viewed from the front. The normal direction to the paper surface of FIG. 6 is parallel to the Y-axis direction. As described above, the substrate accommodating portion 132 is located behind the electromagnet 130. Therefore, when the switch body 102 is viewed from the front, most of the casing Hg including the board accommodating portion 132 is hidden by the electromagnet 130, as can be seen from FIG. Therefore, an increase in the area occupied by the switch body 102 when viewed from the front due to the provision of the housing Hg can be suppressed. In this embodiment, when viewed from the front, the ratio of the area occupied by the housing Hg to the area occupied by the suction surface 130a is small.

As shown in FIG. 6, the area occupied by the casing Hg when viewed from the front is such that the area located on the side where the screw hole 130c is provided with respect to the center of the suction surface 130a is It is larger than the area located on the opposite side to where the screw hole 130c is provided. In other words, when viewed from the front, most of the housing Hg is located above the center of the suction surface 130a. When the switch body 102 is fixed by the screw hole 130c, a dead space is created between the maximum dimension portion of the suction surface 130a in the X-axis direction and the door opening frame 2 to which the switch body 102 is attached. By utilizing the dead space in the area where the housing Hg is provided, the workability through the door opening frame 2 is less likely to deteriorate. Therefore, the switch main body 102 is arranged by configuring the casing Hg so that the area occupied by the casing Hg when viewed from the front is larger on the side where the screw hole 130c is provided with respect to the center of the suction surface 130a. The workability of the work through the door opening frame 2 is ensured.

FIG. 7 is a side view of the switch body 102. The switch body 102 has a substrate accommodating portion 132 on the side opposite to the attraction surface 130a with respect to the electromagnet 130 (FIG. 8). As mentioned above, the reference symbol Hg indicates the housing of the board accommodating section 132. A connector connecting portion 144 is provided in the substrate accommodating portion 132 on the side opposite to where the suction surface 130a is located in the Y-axis direction, that is, on the rear end surface 134 (FIGS. 7 and 8). The rear end surface 134 is also the end surface of the switch body 102 on the opposite side to where the suction surface 130a is located. The connector connecting portion 144 extends in a direction away from the suction surface 130 along the Y-axis direction. By providing the connector connecting portion 144 on the end surface 134 of the board accommodating portion 132, it is not necessary to arrange the cable connected to the connector connecting portion 144 around the switch body 102. Furthermore, since the connector connecting portion 144 is disposed on the rear end surface 134 of the board accommodating portion 132, at least a portion of the cable connected to the connector connecting portion 144 near the connector connecting portion 144 is placed rearward from the switch body 102. To position. Therefore, the possibility that the visibility of the display section 142 from the front will be reduced due to the cable is reduced. In addition, by routing the cable connected to the connector connecting portion 144 backward from the switch body 102 or above the screw hole 130c, the cable is routed so as not to be located near the opening formed by the door opening frame 2. Therefore, the workability of working through the door opening frame 2 is unlikely to deteriorate.

FIG. 8 is a longitudinal cross-sectional view of the switch body 102 taken along the Z-axis direction. FIG. 9 is a diagram for explaining the arrangement of the two substrates Cb(1) and Cb(2) arranged in the substrate accommodating part 132. FIG. 9 is a perspective view of the switch body 102 with the housing Hg removed to expose the housing portion 132, as seen diagonally from the front. FIG. 10 is an exploded perspective view of the electromagnet 130 and the housing Hg, and is a view of the switch body 102 viewed from the rear.

Referring to FIG. 9, although not particularly limited, by forming a part of the yoke portion Yk (FIG. 24) of the electromagnet 130, which will be described later, into a raised shape, the protrusion 130b can be formed by this raised portion. It is configured. In the arrangement example shown in FIG. 2, the switch body 102 is attached so that the protruding portion 130b is located at the top, but it is also possible to attach the switch main body 102 so that the mounting portion 103b is located at the side.

As can be seen from FIGS. 5 and 8, the protrusion 130b has two screw holes 130c spaced apart from each other in the front and back, that is, in the Y-axis direction, and is shaped into an L-shaped cross section by using a screw Sc that is screwed into these two screw holes 130c. It is fixed to the first bracket 106 (FIG. 2).

8 and 9, the substrate housing section 132 accommodates a first substrate Cb(1) and a second substrate Cb(2). ) are arranged in a perpendicular state. Specifically, the first substrate Cb (1) is arranged with its plate surface aligned in the Y-axis direction, and the second substrate Cb (2) is arranged with its plate surface aligned in the Z-axis direction. has been done. The second substrate Cb(2) is disposed at the rear end of the first substrate Cb(1) in the state shown in FIG. 8, preferably hanging down from the first substrate Cb(1).

As described above, the switch body 102 includes at least the display section 142 (FIGS. 2, 5, and 7) that displays a display corresponding to the safety-related output output by the switch body 102. The display section 142 is provided at a position that is visible from the side of the switch body 102 opposite to the surface where the screw hole 130c serving as the attachment section is located. That is, it is provided at a position that is visible from the side where the mounting surface formed by the top surface of the protrusion 130b does not exist. When the switch body 102 is fixed to the door opening frame 2, the screw holes 130c are arranged and fixed so as to face outward from the opening formed in the door opening frame 2. Therefore, the surface opposite to the surface on which the screw hole 130c is provided is arranged so as to face inside the opening. In the example of FIG. 2, since the switch body 102 is fixed to the upper horizontal frame portion 2b of the door opening frame 2, the direction outward from the opening is upward. In the upper horizontal frame portion 2b, since the inside of the opening is downward, the surface on which the display section 142 is provided faces downward. In this embodiment, it is fixed to the upper horizontal frame part 2b of the door opening frame 2 forming the opening, but the frame part on the opposite side of the door opening frame 2 to the side where the hinge 4 is provided (as shown in FIG. When the switch main body 102 is fixed to the right frame (right side frame), the display section 142 is located on the left side on the paper surface of FIG. By providing the display section 142 on the side opposite to the screw hole 130c in this manner, the display section 142 faces the side of the door opening frame 2 opposite to the frame section to which the switch body 102 is attached, that is, the inside of the opening. When looking into the operating area S from outside the door PD having the transparent board 8, the switch body 102 is visually recognized from inside the opening because the transparent board 8 is located inside the opening. Therefore, by positioning the display section 142 inside the opening when fixed to the door opening frame 2, the visibility of the display section 142 is improved.

The second board Cb (2) is connected to the connector connection part 144, and the second board Cb (2) has a plurality of indicator lights 150 (FIG. 8) of different colors on the lower front surface, specifically a plurality of indicator lights 150 (FIG. 8). LED elements are mounted. The plurality of indicator lights (LED elements) 150 constitute a light source of the display section 142. As is well known, the display unit 142 arranged on a surface where the switch body 102 installed in the operating area S can be viewed from the outside has a function of displaying the operating state of the switch body 102 in a distinguishable color. .

Referring to FIG. 8, in the substrate accommodating portion 132, a first substrate Cb (1) whose plate surface extends back and forth, that is, along the Y-axis direction, and a second substrate Cb (2) whose plate surface extends along the Z-axis direction. ), a limited illumination space Ls is formed. Then, the light of the LED 150 mounted on the second substrate Cb (2) is emitted toward this limited illumination space Ls, and as a result, the light from the LED 150 that forms part of the display section 142 and the casing of the substrate storage section 132 is emitted. It is displayed through a light-transmissive material that forms part of the body Hg. Of course, the LED 150 constituting the light source may be provided on the first substrate Cb(1).

The visibility of the display section 142 through the door PD will be explained with reference to FIGS. 11 and 12. FIG. 11 is a diagram peeping into the switch body 102 from the outside through the door PD. FIG. 12 is a schematic diagram created to explain the visibility of the display section 142. In the figure, reference symbol Ey is the operator's eye.

In FIG. 12, reference numeral 142-1 indicates a display section located near the suction surface 130a of the switch body 102. That is, the distance D-1 in the Y-axis direction between the suction surface 130a and the display section 142-1 is relatively small. Reference numeral 142-2 indicates a display section located distal to the suction surface 130e. The distance D-2 in the Y-axis direction between the suction surface 130a and the display section 142-2 is relatively large. As can be understood from FIG. 12, although it is optional, it is better to arrange the display section 142 distally than near the suction surface 130a when viewing the display section 142 from the outside through the door PD. It can be seen that the visibility is good. Preferably, the display section 142 is disposed behind an intermediate line Imd that is half the total length L (FIG. 5) of the switch body 102 in the Y-axis direction. That is, it is preferable to arrange the display section 142 at a position farther from the suction surface 130a in the Y-axis direction than the intermediate line Imd.

As can be seen from FIG. 7, the outer surface of the display section 142 has a curved cross-sectional shape, and extends to an intermediate portion in the Z-axis direction on both sides of the switch body 102. Thereby, the display section 142 can be visually recognized from three sides excluding the mounting surface. Furthermore, the display section 142 has a shape that is tapered toward the suction surface 130a in the Y-axis direction. In other words, the display section 142 has a surface that is inclined toward the front, which is the outside of the operating area S in the door PD. By making the display section 142 tapered toward the suction surface 130a, the display section 142 can be easily viewed by the operator.

The housing Hg of the board accommodating portion 132 is made of a plastic molded product. A portion of the housing Hg has a shape that extends in the direction of the attraction surface 130a and surrounds a portion of the protrusion 130b of the electromagnet 130. The housing Hg has a flat top surface that is substantially at the same height as the top surface of the protrusion 130b (FIG. 5).

A control circuit that generates a drive signal for the electromagnet 130, a power supply circuit, a communication circuit with the actuator 104, and the like are mounted on the main body Cb (main body) of the first substrate Cb (1). On the other hand, an indicator light control circuit and the like are mounted on the second board Cb(2).

Referring to FIG. 9, in the board accommodating part 132, a first board Cb (1) whose plate surface extends along the Y-axis direction is located in the board accommodating part 132 and has a main body Cb (1) on which a control circuit and the like are mounted. It has a pair of elongated left and right board extensions Cb (1ex) extending in the Y-axis direction from the main body to the vicinity of the suction surface 130a. The pair of substrate extensions Cb (1ex) are located on both sides of the protrusion 130b with the protrusion 130b interposed therebetween in the X-axis direction. By arranging the pair of board extensions Cb (1ex) on both sides of the protrusion 130b, the height of the switch body 102 in the Z-axis direction is prevented from increasing due to the presence of the board extensions Cb (1ex). Can be done. Moreover, the board extension part Cb (1ex) is arranged at a position where a part thereof overlaps with the electromagnet 130 when viewed in the Z-axis direction. Therefore, the presence of the board extension portion Cb (1ex) can reduce the increase in the dimensions of the switch body 102 in the Z-axis direction and the X-axis direction.

In the pair of substrate extensions Cb (1ex), one of the substrate extensions Cb (1ex) has a sensor side coil (antenna coil) 152 mounted at its tip (FIG. 9). The sensor-side coil 152 constitutes a detection unit that detects that the actuator 104 is within a predetermined range with respect to the switch body 102. By mounting the sensor-side coil 152 on the tip of one of the board extensions Cb (1ex), the sensor-side coil 152 can be positioned close to the attraction surface 130a in the Y-axis direction. As a result, the detection ability of the sensor side coil 152 can be improved. As is well known, this sensor side coil 152 is arranged corresponding to the actuator communication section 124 of the actuator 104 described above. At this time, in order for the sensor-side coil 152 to detect the actuator communication unit 124, the sensor-side coil 152 is covered with a housing Hg made of plastic instead of metal. Therefore, in the switch body 102, a part of the housing Hg exists on the surface facing the actuator 102 in addition to the suction surface 130a. In this embodiment, as described above, by arranging a part of the casing Hg in the dead space, workability through the door opening frame 2 in which the switch body 102 is arranged can be maintained.

For example, in the process of closing the door PD, the iron piece 120 of the actuator 104 approaches the suction surface 130a of the switch body 102 in conjunction with the closing operation of the door PD, as shown in FIG. It overlaps with the suction surface 130a. It is designed so that the diameter D1 (FIG. 4) of the iron piece 120 (the attracted surface 120a) is larger than the diameter D2 of the attracted surface 130a. Based on the state in which the iron piece 120 overlaps the switch body 102 in a normal state, that is, in the normal state in which the center O1 of the iron piece 120 and the center O2 of the attraction surface 130a are aligned, the outer edge of the attraction surface 130a is aligned with the attraction surface of the iron piece 120. The diameter D1 of the iron piece 120 is set to the diameter D2 of the suction surface 130a so that the iron piece 120 is located within the suction surface 120a. Thereby, even if the switch body 102 and/or the actuator 104 undergo a permissible relative displacement, the switch body 102 can fix the actuator 104 with a predetermined attraction force.

When the door PD is closed, that is, when the sensor-side coil 152 detects the actuator communication unit, a safety-related output is output to a control device (for example, PLC) that controls the device installed in the operating area S (FIG. 2). An RFID detection circuit (not shown) associated with the sensor-side coil 152 is mounted on the board extension Cb (1ex) of the first board Cb (1), and the electromagnet 130 receives the signal from the sensor-side coil (antenna coil) 152. controlled based on

FIG. 13 is a block diagram for explaining the electrical configuration of the switch body 102. The control circuit 200 of the switch body 102 includes a first MCU 202 and a second MCU 204. The first MCU 202 and the second MCU 204 monitor the other party by communicating with each other.

First MCU 202 is connected to transmitter circuit 206 . The transmitting circuit 206 is connected to the sensor side coil (antenna coil) 152. The sensor side coil 152 is connected to the receiving circuit 208. Receiving circuit 208 is connected to both first MCU 202 and second MCU 204. The sensor-side coil 152 is controlled to exchange wireless signals with a coil included in the actuator communication section 124. The first MCU 202 drives the sensor-side coil 152 via the transmission circuit 206 and supplies a wireless signal from the sensor-side coil 152 to the actuator communication unit 124 . The actuator communication unit 124 includes at least a coil and a circuit, and as shown in FIG. 4, the coil is arranged so as to be located in a portion covered by the plastic molded product 122. The first MCU 202 and the second MCU 204 receive a wireless signal from the actuator communication unit 124 via the sensor side coil 152 and the receiving circuit 208. The RFID 152 has a sensor side coil 152 and a response circuit. The actuator communication unit 124 may be a wireless tag (RF-ID tag). The response circuit operates using the induced current generated in the sensor side coil 152 as a power source. The response circuit demodulates the wireless signal received by the sensor-side coil 152 to obtain information, and further transmits a wireless signal (response signal) via the sensor-side coil 152.

14 and 15, the measurement unit 210a of the first MCU 202 and the measurement unit 210b of the second MCU 204 receive wireless signals from the actuator communication unit 124 via the sensor side coil 152 and the reception circuit 208, respectively. The signal strength is measured, and the distance d (FIG. 17) between the switch body 102 and the actuator 104 is estimated based on the strength of the wireless signal. The safety determination circuit 214a of the first MCU 202 and the safety determination circuit 214b of the second MCU 204 determine whether the estimated distance d is less than or equal to a threshold value, that is, whether the actuator 104 is within a predetermined range with respect to the switch body 102. Determine. In other words, at least the sensor side coil 152, the receiving circuit 208, and the first MCU 202 or the second MCU 204 realize a detection unit that detects that the actuator 104 is within a predetermined range with respect to the switch body 102. Ru. Note that instead of the distance d, the strength of the wireless signal may be used as it is to detect the position of the actuator 104. The demodulating unit 212a of the first MCU 202 and the demodulating unit 212b of the second MCU 204 demodulate the information carried by the wireless signal from the actuator communication unit 124 received via the sensor side coil 152 and the receiving circuit 208, respectively. , identifies the actuator 104 based on this information. This information may include unique identification information.

The safety determination circuit 214a of the first MCU 202 determines that the estimated distance d is equal to or less than a threshold value, and that the actuator 104 is identified as a predetermined actuator, based on the measurement by the measurement unit 210a and the identification by the demodulation unit 212a. , and transmits the determination result to the second MCU 204. More specifically, there are two types of determination results: either both conditions are satisfied, or at least one condition is not satisfied. Similarly, the safety determination circuit 214b of the second MCU 204 determines that the estimated distance d is less than or equal to the threshold and that the actuator 104 is identified as a predetermined actuator based on the measurement by the measurement unit 210b and the identification by the demodulation unit 212b. It is determined whether the following two conditions are satisfied, and the determination result is transmitted to the first MCU 202. The safety determination circuit 214a of the first MCU 202 identifies a state in which the actuator 104, which is identified as a predetermined actuator, is within a predetermined range with respect to the switch body 102 when its own determination result and the second MCU's determination result match. That is, a safety-related output is output that determines that the door PD is in the closed state. Similarly, when the safety determination circuit 214b of the second MCU 204 matches the determination result of the first MCU, the safety determination circuit 214b determines that the actuator 104, which is identified as a predetermined actuator, is in a predetermined position with respect to the switch body 102. It is determined that the state is within the range, that is, the door PD is in a closed state. In addition, in this embodiment, as will be described later, when the conditions related to the signal input via the input circuit 220 are also satisfied, the first MCU 202 and the second MCU 204 operate as an OSSD (Output Signal Switching Device). The safety-related output is outputted via the switching device)), and the safety-related output is outputted based on the wireless signal received via the receiving circuit 208 and the mutual determination results of the first MCU 202 and the second MCU 204. Also good. Furthermore, in this embodiment, the distance d between the switch body 102 and the actuator 104 is estimated and the actuator 104 is identified based on the wireless signal detected by the sensor-side coil 152, but only the distance d is estimated. may be made, and the safety determination circuits 214a and 214b may output the determination result of whether the distance d is less than or equal to a threshold value to the other safety determination circuit without making a determination regarding the identification of the actuator 104. .

Returning to FIG. 13, input circuit 220 includes a first safety input 222, a second safety input 224, and a lock input 226. Other devices capable of outputting safety-related outputs are connected to the first safety input section 222 and the second safety input section 224. That is, the first safety input section 222 and the second safety input section 224 are input circuits for connecting the switch body 102 and other devices in a daisy chain. For example, the first safety input section 222 and the second safety input section 224 are such that one of the terminals for outputting the safety-related output of another device is connected to the first safety input section 222, and the second safety input section 224 is connected to the first safety input section 222. Another terminal for outputting the safety-related output of the other device is connected to the terminal.

The lock input unit 226 is connected to an external control device such as a safety PLC or a safety control device, receives a lock signal output from the external control device to control the lock mechanism, and outputs the input signal to the second MCU 204. . The second MCU 204 determines whether the signal input via the lock input section 226 is an ON signal. The second MCU 204 can drive the electromagnet 130 based on the lock signal input via the lock input unit 226 to cause the electromagnet 130 to be attracted to the iron piece 120 of the actuator 104 . That is, the door PD is locked by magnetic force in response to a signal input via the lock input section 226. Note that the second MCU 204 may drive the electromagnet 130 when the signal input via the lock input unit 226 is an ON signal, or the second MCU 204 may drive the electromagnet 130 when the signal input via the lock input unit 226 is an ON signal. The electromagnet may be driven when it is determined that in addition to this, other conditions are satisfied. For example, the above-mentioned determinations by the safety determination circuits 214a and 214b may be used as a condition for driving the electromagnet 130. In this case, since the electromagnet 130 is driven when it is determined that the predetermined actuator 104 is within a predetermined range with respect to the switch body 102, the door PD is closed by the lock signal output from the external control device. The reliability of maintaining the state is improved.

The control circuit 200 includes a first OSSD 230a and a second OSSD 230b as switching devices 230. The first MCU 202 and the second MCU 204 each generate a safety signal, the first MCU 202 outputs a safety related output as a safety signal via the first OSSD 230a, and the second MCU 204 outputs a safety related output as a safety signal via the second OSSD 230b. Outputs safety-related outputs through the Note that the external device that outputs safety-related outputs via the first OSSD 230a and the second OSSD 230b and the external control device that outputs the lock signal that is input via the lock input section 226 are the same device. The partition system 1 may be composed of either one or different devices.

The first OSSD 230a and the second OSSD 230b are configured by, for example, PNP type transistors. When the PNP type transistor is turned on, the + side power supply is connected to the output terminal, so that an ON signal is output. On the other hand, when the PNP transistor is turned off, the output terminal is grounded via the pull-down resistor, so an OFF signal is output.

An OSSD monitoring circuit 232 may be connected to each of the first OSSD 230a and the second OSSD 230b. OSSD monitoring circuit 232 is connected to first MCU 202 and second MCU 204. The first MCU 202 monitors whether the second OSSD 230b is operating normally through the OSSD monitoring circuit 232. The second MCU 204 monitors whether the first OSSD 230a is operating normally through the OSSD monitoring circuit 232. For example, when each of the first OSSD 230a and the second OSSD 230b outputs an ON signal, the output signal periodically transitions to OFF for a short period of time. The OSSD monitoring circuit 232 determines that the OSSD is normal if it can detect a minute OFF during the output period of the ON signal, and determines that the OSSD is not normal if it cannot detect a minute OFF.

Note that the case where the OSSD monitoring circuit 232 cannot detect a short OFF time and the ON signal continues is caused by, for example, a short circuit between the output terminal and the + side power supply. In this case, the safety determination circuits 214a and 214b each output a control signal for outputting an OFF signal to the first OSSD 230a and the second OSSD 230b. As a result, the normally operating one of the first OSSD 230a and the second OSSD 230b outputs an OFF signal. Note that the transition of the safety-related output to OFF for monitoring by the OSSD monitoring circuit 232 is set to a time so short that the external device to which the safety-related output is output does not react to the OFF.

The power supply circuit 240 is a DC-DC converter that receives DC +24V and 0V from the outside and generates DC voltages such as DC +10V, +5V, and +3.3V. The power supply circuit 240 supplies power to all circuits that require power, such as the control circuit 200, the sensor-side coil 152, and the display section 142. By the way, if the voltage supplied from the external power supply or the voltage output from the power supply circuit 240 is not within a predetermined range, the control circuit 200 and the like may not operate normally. Therefore, the power supply monitoring circuit 242 determines whether the voltage supplied from the external power supply is within a predetermined range, determines whether the voltage output from the power supply circuit 240 is within a predetermined range, and outputs the determination results. It outputs to the first OSSD 230a and the second OSSD 230b. When each of the first OSSD 230a and the second OSSD 230b receives a determination result indicating that the power supply circuit 240 is not operating normally, the first OSSD 230a and the second OSSD 230b output safety-related outputs without depending on the control signal output from the control circuit 200. Turn off. When each of the first OSSD 230a and the second OSSD 230b receives a determination result indicating that the power supply circuit 240 is operating normally, it outputs safety-related outputs depending on the control signal output from the control circuit 200. Output.

The control circuit 200 includes an indicator light control unit 252 that controls the display unit 142, and the indicator light control unit 252 included in the second MCU 204 displays a display status signal according to the safety-related output via at least the second OSSD 230b. It is supplied to the light control section 252. With reference to FIG. 16, the relationship between ON/OFF of safety-related outputs and the determination results at the first MCU 202 and the second MCU 204 will be described.

The “indicator light” column in FIG. 16 shows the light emission pattern of the display unit 142 that is controlled based on the display state signal supplied to the display control unit 252. The "Status" column is subdivided into "OSSD", "Safety input", "Lock control input", and "Actuator". The "OSSD" column indicates whether the safety-related output output to the external control device via the first OSSD 230a and the second OSSD 230b as the switching device 230 is ON or OFF. In addition, each column of “safety input,” “lock control input,” and “actuator” indicates the judgment items used when determining whether to turn the safety-related output output via the switching device 230 ON or OFF. show. The column "Safety Input" indicates whether the safety-related outputs input via the first safety input section 222 and the second safety input section 224 are ON or OFF. The column "lock control input" indicates whether a lock signal input from an external control device via the lock input section 226 is ON or OFF. The column “actuator” indicates that the actuator 104, which is identified as a predetermined actuator based on the wireless signal received via the sensor side coil 152 and the receiving circuit 208, is detected to be within a predetermined range with respect to the switch body 102. Indicates whether it was done or not.

As shown in FIG. 16, in this embodiment, the safety-related outputs outputted via the switching device 230 turn ON when inputted via the first safety input section 222 and the second safety input section 224. This is when the safety-related output is ON, the lock signal input via the lock input section 226 is ON, and the actuator 104 is detected. At this time, the light emission pattern of the display section 142 is green lighting. Furthermore, when the actuator 104 is not detected, the safety-related output is output via the switching device 230 regardless of the safety-related outputs and lock signals input via the first safety input section 222 and the second safety input section 224. The output is turned OFF, and the light emission pattern of the display section 142 is red lighting. The safety switch 100 of this embodiment detects whether the actuator 104 is within a predetermined range with respect to the switch body 102 in order to maintain the operating area S in a safe environment. When the actuator 104 is not detected, it means that the door PD is not closed and the operating area S is not maintained as a safe environment. The safety-related outputs are turned OFF.

In addition to detecting the actuator 104, the safety switch 100 of this embodiment also refers to the input states of various signals to determine whether to turn on or turn off the safety-related outputs outputted via the switching device 230. do. At this time, the operator can check the state of the safety-related outputs and lock signals input through the first safety input section 222 and the second safety input section 224 in comparison with the detection of the actuator 104. Difficult to grasp. More specifically, whether or not the actuator 104 is detected has a certain relationship with whether or not the door PD is closed. When the safety-related output outputted through the switch is OFF, it is easy for the worker to identify the cause. On the other hand, regarding the safety-related outputs and lock signals inputted through the first safety input section 222 and the second safety input section 224, the operator must check whether the corresponding cables are connected or not. etc. can be confirmed from the outside, but it is difficult to understand from the outside how the signal is being supplied via the cable. Therefore, in this embodiment, when the safety-related output outputted via the switching device 230 is OFF due to the input state of various signals, the display section 142 is displayed according to the input state of the various signals. By changing the light emission pattern, the operator can easily identify the reason why the safety-related output outputted from the switch body 102 via the switching device 230 is OFF.

Note that in this embodiment, since other devices capable of outputting safety-related outputs are connected to the first safety input section 222 and the second safety input section 224, the "safety input" column in FIG. The safety-related outputs output by the switch body 102 and the light emission pattern of the display unit 142 change, but if the other device is not connected, the switch body The safety-related output outputted by 102 and the light emission pattern of display unit 142 may be determined. In this case, when the "Lock control input" column is "ON" and the "Actuator" column is "Detected", the safety-related output output by the switch body 102 is turned ON, and the light emission pattern on the display section 142 is changed. The light will turn green. Furthermore, in this case, there is no case where the light emission pattern of the display unit 142 is "orange" or "blinking orange" as shown in FIG. 16.

As described above, the measurement unit 210a of the first MCU 202 and the measurement unit 210b of the second MCU 204 receive wireless communication from the actuator communication unit (RFID) 124 (FIG. 4) via the sensor side coil 152 (FIG. 9). The distance d between the actuator 104 and the switch body 102 is estimated by measuring the signal. In addition, the first MCU 202 and the second MCU 204 are such that the distance d2 between the attraction surface 130a and the attraction surface 120a is equal to or less than a threshold value, and the lock signal input via the lock input unit 226 is If ON, the second MCU 204 drives the electromagnet 130 to attract the iron piece 120.

Referring to FIG. 18, the determination of whether the distance d2 is less than or equal to the threshold will be specifically described. The second MCU 204 supplies a test current to the electromagnet 130 and monitors the current flowing through the electromagnet 130 at this time. (I) in FIG. 18 shows a rectangular wave of the test current. The value of this test current is smaller than the value of the locking current supplied to the electromagnet 130 to maintain the closed state of the door PD, that is, to form the locked state of the safety switch 100. If a current with the same value as the locking current is used for inspection, the electromagnet 130 will attract the iron piece 120 with enough attraction force to keep the door PD closed even if the lock signal is not ON. Therefore, the operation of opening the door PD is hindered, and the work efficiency of the worker is reduced. Therefore, by setting the value of the current for inspection to a value smaller than the value of the current for locking, in particular, a value so weak that the electromagnet 130 hardly exerts any adsorption force, the work efficiency of the operator can be improved. can be maintained.

(II) in FIG. 18 is a state in which the electromagnet 130 and the iron piece 120 are not in close contact with each other, that is, in a state in which the distance d2 between the attracting surface 130a and the attracted surface 120a is larger than the threshold value. The monitoring current flowing through the electromagnet 130 in response to the rectangular wave test current is shown. (III) in FIG. 18 is a state in which the electromagnet 130 and the iron piece 120 are in close contact, that is, in a state in which the distance d2 between the attracting surface 130a and the attracted surface 120a is less than the threshold value. ) shows the monitoring current flowing through the electromagnet 130 in response to the rectangular wave test current. As can be seen by comparing (II) and (III) in FIG. 18, the electromagnet 130 and the iron piece 120 are in close contact with each other, that is, the distance d2 between the attracting surface 130a and the attracted surface 120a is smaller than the threshold value. In some cases, the inductance becomes larger than when the distance d2 is equal to or greater than the threshold value, so that the time from the time when the test current starts to be supplied until the value of the monitoring current reaches a certain value becomes longer.

If the time from when the supply of test current is started until the value of the monitoring current reaches a certain value is different, the value of the current flowing through the electromagnet 130 will be different when a certain period of time has elapsed from the time when the supply of test current was started. For comparison, in (II) and (III) of FIG. 18, the timing at which a certain period of time has elapsed from the time when the test current was started to be supplied to the electromagnet 130 is shown as the test confirmation timing. The value of the monitoring current flowing through the electromagnet 130 when the distance d2 between the attracting surface 130a and the attracting surface 120a is larger than the threshold value at the inspection confirmation timing is the first monitoring current value shown in (II) of FIG. It is I1. Furthermore, the current value at the inspection confirmation timing of the monitoring current flowing through the electromagnet 130 when the distance d2 between the attracting surface 130a and the attracting surface 120a is less than or equal to the threshold value is the second value shown in (III) in FIG. This is the monitored current value I2. Comparing the first monitored current value I1 and the second monitored current value I2, the first monitored current value I1 is larger. In other words, the monitoring current that takes a shorter time to reach a certain value from the time when the test current is supplied ((II) in FIG. 18), in other words, the monitoring current with high responsiveness is better than the monitoring current with low responsiveness ((II) in FIG. 18). Compared to (III) in FIG. 18, the value of the current at the inspection confirmation timing is large. Therefore, by comparing the values of the monitoring current at the inspection confirmation timing, it is possible to determine the level of responsiveness of the monitoring current flowing through the electromagnet 130, the level of inductance associated with the level of responsiveness, and the adsorption surface associated with the level of inductance. It is possible to determine whether the distance d2 between 130a and the attracting surface 120a is long or short. More specifically, a current value threshold is set between at least the first monitored current value I1 and the second monitored current value I2 so that the magnitude relationship between the distance d2 and the threshold value can be determined, and the inspection Depending on whether the current value of the monitoring current at the confirmation timing is greater than or equal to the threshold, it is determined whether the distance d2 is greater than or equal to the threshold.

FIG. 19 is a longitudinal cross-sectional view of actuator 104 showing a preferred embodiment of actuator 104. FIG. FIG. 19 shows the actuator 104 attached to the door PD in which the door frame 6 is attached in parallel to the door opening frame 2 to which the switch body 102 is attached in the manner shown in FIG. Therefore, the normal direction of the door frame 6 (PD) coincides with the Y-axis direction as the normal direction of the attracting surface 130a of the electromagnet 139 included in the switch body 102. Furthermore, the actuator 104 in FIG. 19 is in a state in which the normal direction of the attracted surface 120a of the iron piece 120 included in the actuator 104 coincides with the Y-axis direction. The actuator 104 may have a structure in which the iron piece 120 is fixed to the mounting bracket 126, but in the actuator 104 illustrated in FIG. 19, the iron piece 120 is movable with respect to the mounting bracket 126.

Referring to FIG. 19, the aforementioned mounting bracket 126 constitutes a base member of the actuator 104. The mounting bracket 126 has a U-shaped cross section with flanges at both ends, and is provided with a through hole 126a in the center of the flat top. The actuator 104 has a movable pin 320 inserted into the through hole 126a of the mounting bracket 126, and one end of the movable pin 320 is fixed to the iron piece 120. The iron piece 120 has a permanent magnet 120b that is circular in front view at the center of its attracted surface 120a. The movable pin 320 inserted into the through hole 126a of the mounting bracket 126 is movable relative to the mounting bracket 126 in the axial direction of the movable pin 320. With this configuration, the attracted surface 120a can be moved relative to the mounting bracket 126. A mechanism is configured to do this.

The movable pin 320 has a pin head 320a located at the end on the mounting bracket 126 side. Movable pin 320 is inserted into sleeve 322. The sleeve 322 has a length in the axial direction of the movable pin 320, and has a flange 322a at one end and a flange 322b at the other end that both extend radially outward and in the circumferential direction. The one end flange 322a and the other end flange 322b of the sleeve 322 are used to keep the position of the iron piece 120 constant with respect to the movable pin 320, and the iron piece 120, the movable pin 320, and the sleeve 322 are used to keep the position of the iron piece 120 constant with respect to the mounting bracket 126. Moving.

The movable pin 320 and the sleeve 322 are movable in the axial direction of the movable pin 320, with the outer peripheral surface of the sleeve 322 being guided by the through hole 126a. The sleeve 322 has a guide function for guiding the movement of the movable pin 320 in the axial direction. The movable pin 320 is also swingable together with the sleeve 322 within the through hole 126a. That is, the diameter of the sleeve 322 is smaller than the diameter of the through hole 126a, and the sleeve 322 is loosely fitted into the through hole 126a. This configuration constitutes a swinging mechanism that swings the attracted surface 120a.

A compression coil spring 324 is provided between one end flange 322a of the sleeve 322 and the mounting bracket 126. The compression coil spring 324 constitutes a biasing means that biases the movable pin 320 and the attracted surface 120a in a direction toward the door frame 6.

FIG. 20(I) is a plan view of the compression coil spring 324. (II) of FIG. 20 is a side view of the compression coil spring 324 in an unloaded state. FIG. 20(III) is a side view of the compression coil spring 324 in a compressed state under a load. As can be seen from FIG. 20(I), the compression coil spring 324 is configured as a trapezoidal spiral spring whose diameter is gradually reduced in the axial direction. This spiral compression coil spring 324 can have a flat shape when viewed from the side in a compressed state. Therefore, the range of movement of the movable pin 320 increases in the direction in which the compression coil spring 324 is compressed.

In this embodiment, the state of the actuator 104 illustrated in FIG. 19, that is, the state in which the compression coil spring 324 moves the iron piece 120 in the direction approaching the door frame 6, in other words, in the direction away from the electromagnet 130, is assumed. A standby state is set, and the position of the iron piece 120 in this state is set as a standby position. The standby position of the iron piece 120 corresponds to the position of the iron piece 120 represented by the two-dot chain line shown in FIG. Note that, as a modification of the compression coil spring 324, an elastic body such as a disc spring or rubber can be cited.

A cushion member 326 is disposed between the other end flange 322b of the sleeve 322, the mounting bracket 126, and the iron piece 120 (FIG. 19). As will be explained later, the impact when the iron piece 120 overlaps the attraction surface 130a of the electromagnet 130 based on the attraction force of the permanent magnet 120b is alleviated by the compression coil spring 324 and the cushion material 326.

FIG. 21 is a diagram for explaining the action of the actuator 104. 21(I) shows the actuator 104 in a standby state, and corresponds to FIG. 19.

(II) of FIG. 21 shows that in the process of the door PD changing from the open state to the closed state, that is, in the process of the worker closing the door PD, the actuator 104 The figure shows a state in which the switch body 102 is close to the attracting surface 130a of the electromagnet 130. At this time, the electromagnet 130 is not driven. As shown in FIG. 21 (II), when the actuator 104 approaches the electromagnet 130, the attractive force by the permanent magnet 120b included in the actuator 104 acts on the attraction surface 130a of the electromagnet 130. When this attractive force becomes larger than the spring force of the compression coil spring 324, the compression coil spring 324 starts to be compressed. Then, under the attractive force of the permanent magnet 120b, the movable pin 320 and the iron piece 120, together with the actuator housing 122, move in a direction away from the door frame 6, that is, in a direction toward the attraction surface 130a. Therefore, for example, when the door PD is closed and the distance between the actuator 104 and the switch body 102 falls within a certain range, the movable pin 320 and the iron piece 120 are attracted along the Y-axis direction along with the actuator housing 122. It moves in the direction approaching the surface 130a.

(III) of FIG. 21 shows a state in which the attracting surface 120a and the attracting surface 130a are brought into close contact with each other by the attractive force of the permanent magnet 120b after the process (II) described above. In other words, the actuator communication unit 124 switches the switch so that the distance d estimated based on the strength of the wireless signal received from the actuator communication unit 124 via the sensor-side coil 152 in this state is equal to or less than the threshold value. A threshold value for the distance d is set so that it is determined that the actuator 104 is within a predetermined range with respect to the main body 102. In addition, in the state (III) of FIG. 21, the second MCU 204 supplies a detection current to the electromagnet 130 and monitors the current flowing through the electromagnet 130, thereby bringing the attracting surface 120a and the attracting surface 130a into close contact. It is determined whether or not the state is the same. When it is determined that the attracting surface 120a and the attracting surface 130a are in close contact with each other, the second MCU 204 drives the electromagnet 130 to attract the iron piece 120 so as to maintain the closed state of the door PD. In this embodiment, when the door PD is closed, the iron piece 120 moves toward the attracting surface 130a due to the attractive force of the permanent magnet 320 included in the actuator 104, and the attracting surface 130a and the attracted surface 120a are brought together. Although the iron pieces 120 are in close contact with each other, the movement of the iron piece 120 toward the suction surface 130a may be realized by other means. For example, the structure may be such that the iron piece 120 moves toward the suction surface 130a due to inertia when the door PD is in a closed state, that is, when the door PD is closed. Further, the electromagnet 130 is driven so that the electromagnet 130 generates a suction force that is weaker than the suction force for maintaining the door PD in a closed state, and the iron piece 120 is moved toward the suction surface 130a side by the suction force. It may also be configured to move.

FIG. 22 is a cross-sectional view for explaining state changes of the actuator 104. (I) of FIG. 22 is a diagram corresponding to (I) of FIG. 19, in which the actuator 104 is in a standby state. (II) in FIG. 22 shows the state when the iron piece 120 of the actuator 104 assumes the maximum action position where it extends to the maximum, that is, when the movable pin 320 assumes the maximum stroke position where it is displaced in its axial direction, that is, the Y-axis direction. It shows the status of. This state can be created by the attractive force of the permanent magnet 320. (III) of FIG. 22 shows that when the iron piece 120 overlaps the attraction surface 130a under the attractive force of the permanent magnet 320, the iron piece 120 is swung so that the attraction surface 120a is parallel to the attraction surface 130a. FIG. By swinging the movable pin 320, that is, by tilting its axis Ax, a parallel state between the attracting surface 120a and the attracting surface 130a is established.

As described above, the actuator communication unit 124 is disposed in the actuator housing 122 surrounding the iron piece 120 (FIG. 3). On the other hand, a sensor-side coil 152 is disposed in the switch body 102 (FIG. 9). Based on the strength of the wireless signal received from the actuator communication unit 124 via the sensor side coil 152, it is determined whether the actuator 104 is within a predetermined range with respect to the switch body 102, that is, whether the distance d is less than or equal to a threshold value. It will be judged.

However, in the switch body 102, when the electromagnet 130 and the sensor-side coil 152 are provided in a close positional relationship, the magnetic flux leaking from the electromagnet 130 to the surroundings may cause the wireless signal received from the actuator communication unit 124 via the sensor-side coil 152 to may affect the strength of the In particular, in this embodiment, since the diameter D1 of the attracted surface 120a is set larger than the diameter D2 of the attracted surface 130a, when the attracted surface 130a and the attracted surface 120a are in contact with each other, the The sensor side coil 152 and the coil provided in the actuator communication unit 124 face each other in a positional relationship such that at least a part of the provided sensor side coil 152 overlaps the attracted surface 120a when viewed in the normal direction of the attracted surface 120a. do. Therefore, magnetic flux leakage that affects the strength of the wireless signal received via the sensor-side coil 152 is likely to occur. In order to reduce the influence of magnetic flux leakage on wireless signals, the electromagnet of this example has the configuration shown in FIG. 23. As is well known, the electromagnet 130 includes a core 140a and a cylindrical yoke portion Yk surrounding the core 140a. Although the core 140a and the yoke portion Yk may be made separately, in this embodiment the core 140a and the yoke portion Yk are made integrally. Further, in the embodiment, the above-mentioned protruding portion 130b is constituted by a part of the yoke portion Yk. That is, the yoke portion Yk has a shape in which a portion of the circumferential direction protrudes outward in the radial direction. As a modification, the switch body 102 may be provided with an attachment portion for attaching the switch body 102, in addition to the protrusion 130b that protrudes a part of the yoke portion Yk radially outward.

The yoke portion Yk has the role of improving the attraction force through the magnetic flux emitted from the electromagnet 130. FIG. 24 is a cross-sectional view taken along line XXIII-XXIII in FIG. 23. An arrow 190 drawn with a broken line in FIG. 24 indicates the magnetic flux leaking from the electromagnet 130. In FIG. 24, reference numeral 140a indicates a core. A magnet wire is wound around the core 140a. In FIG. 24, a space 140b is drawn between the core 140a and the yoke portion Yk located on its outer periphery, and as is well known, a magnet wire is located in the space 140b. When the electromagnet 130 attracts the actuator 104, a magnetic circuit is formed by the electromagnet 130 and the actuator 104. The magnetic flux in the magnetic circuit is shown by a black arrow. The magnetic flux generated from the core 140a is generated substantially uniformly in the circumferential direction of the yoke portion Yk. Furthermore, it is known that when the density of the magnetic flux passing through the yoke portion Yk is high, the magnetic flux leaks outside the yoke portion Yk. By providing the protruding portion 130b in a part of the yoke portion Yk, the portion of the yoke portion Yk where the protruding portion 130b is provided in the circumferential direction has a larger cross-sectional area than other portions in the circumferential direction. Therefore, the magnetic flux density of the portion of the yoke portion Yk where the protruding portion 130b is provided in the circumferential direction is relatively low compared to other portions, thereby reducing magnetic flux leakage near the protruding portion 130b. .

The sensor side coil (antenna coil) 152 is arranged near the protrusion 130b. To specifically explain a preferable arrangement of the sensor side coil 152, referring to FIG. 23, a first center line CL1 passes through the center O2 of the attraction surface 130a and the center line of the protrusion 130b, and a first center line CL1 passes through the center O2 and If the periphery of the suction surface 130a is divided into four regions by the first center line CL1 and the second center line CL2 perpendicular to the first center line CL1, then, to explain using the illustrated example, the first quadrant on one side of the protrusion 130b has a sensor side A coil 152 is arranged. Of course, the sensor-side coil 152 may be arranged in the second quadrant on the other side of the protrusion 130b. Furthermore, it is located closer to the suction surface 130a than the first tangent TL1 that is perpendicular to the first center line CL1 and touches the top surface of the protrusion 130b, and is also perpendicular to the second center line CL2 and located on the outer periphery of the suction surface 130a. The sensor-side coil 152 is arranged so as to be located closer to the attraction surface 130a than the second tangent TL2 that is in contact with the attraction surface 130a.

In order to explain the advantage of arranging the sensor-side coil (antenna coil) 152 near the protruding portion 130b, a comparative example electromagnet 400 shown in FIGS. 25 and 26 will be described. FIG. 25 is a diagram of an electromagnet 400 of a comparative example viewed from the attraction surface 400a side. The yoke portion Yk has the same thickness in the circumferential direction. FIG. 26 is a cross-sectional view taken along line XXV-XXV in FIG. 25. In the figure, reference numeral 402 indicates a core. Referring to FIG. 26, by causing electromagnet 400 of the comparative example to attract actuator 410, a magnetic circuit is formed between actuator 410. The magnetic flux in the magnetic circuit is shown by a black arrow. In the magnetic circuit having this configuration, magnetic flux leakage occurs around the yoke portion Yk. Magnetic flux leakage is illustrated by dashed arrows 190.

When the sensor side coil (antenna coil) 152 is placed near the electromagnet 400 on the outer periphery of the electromagnet 400 of the comparative example, the sensor side coil (antenna coil) 152 is affected by the magnetic flux 190 leaking from the yoke portion Yk ( (FIG. 26), this leaked magnetic flux 190 affects the signal strength detected by the sensor side coil (antenna coil) 152.

Returning to FIGS. 23 and 24 regarding this embodiment, the protruding portion 130b that forms part of the yoke portion Yk is relatively thick, which makes it difficult for magnetic flux to leak in the vicinity of the protruding portion 130b. . In this way, by arranging the sensor side coil (antenna coil) 152 near the protrusion 130b where magnetic flux is unlikely to leak (Fig. 23), the signal strength detected by the sensor side coil (antenna coil) 152 due to magnetic flux leakage can be reduced. can reduce the impact of

As described above, the protrusion 130b has the effect of reducing the magnetic flux density in the portion where the protrusion 130b is provided. Generally, the attraction force of a magnet varies depending on the magnetic flux density of the surface that comes into contact with the object to be attracted. Therefore, the electromagnet 130 is shaped so that when the electromagnet 130 attracts the iron piece 120, a gap Gp (FIG. 24) is created between the iron piece 120 and the protrusion 130b. Due to the gap Gp, the area in contact with the iron piece 120 in the portion of the yoke portion Yk where the protrusion 130b is provided can be made smaller than the cross-sectional area of the portion where the protrusion 130b is located in the Y-axis direction. According to this, by providing the protruding portion 130b, it is possible to suppress a decrease in the magnetic flux density at the portion that contacts the iron piece 120, and according to this, the attraction force of the electromagnet 130 can be maintained. That is, adsorption can be effectively stabilized by the gap Gp. The gap Gp can be formed by designing the relatively thick protrusion (protrusion 130b) to be positioned at a position retreated from the suction surface 130a in the Y-axis direction (FIG. 24). Furthermore, in the electromagnet 130 of this embodiment, the yoke portion Yk is basically made to have the same wall thickness in the circumferential direction by forming the gap Gp, so that the yoke portion Yk is in contact with the iron piece 120. The parts are configured so that the magnetic flux density in the circumferential direction is the same. This allows the electromagnet 130 to attract the actuator 104 more stably.

27 to 29 are diagrams for explaining an example of attaching the switch body 102 to the door opening frame 2. FIG. In the figure, reference numeral 350 indicates a level adjustment member for adjusting the height level of the switch body 102. FIG. 27 shows an example in which the switch body 102 is fixed to a level adjustment member 350, and the switch body 102 is fixed to the first bracket 106 via this level adjustment member 350. FIG. 28 is a modification of FIG. 27, in which an intermediate metal plate 132a connected to the electromagnet 130 is interposed between the electromagnet 130 and the board accommodating portion 132, and the switch body 102 is screwed onto this intermediate metal plate 132a. Fixed. In this way, by providing the mounting portion for fixing the switch body 102 to the first bracket 106 in front of the housing Hg forming the board accommodating portion 132, the housing Hg allows the actuator 104 to be attached to the electromagnet 130. Less susceptible to impact caused by contact. Therefore, even if the casing Hg is made of a relatively inexpensive resin, the casing Hg can be made to have a long shape in the front-rear direction, as shown in FIG. 28. 29 is a modification of FIG. 27, in which at least the upper part of the board accommodating part 132 is formed of a metal casing 352, and the switch body 102 is screwed to the metal casing 352 of the board accommodating part 132. An example is shown in which the switch body 102 is fixed to the first bracket 106 via the level adjustment member 350. Metal housing 352 is connected to electromagnet 130. In this modification, the durability of the switch body 102 is improved by providing a metal casing 352 that has a mounting portion and forms the board accommodating portion 132 against impact caused by the actuator 104 coming into contact with the electromagnet. In the first modification shown in FIG. 28 and the second modification shown in FIG. 29, the substrate Cb may have a floating support structure, or may be filled with resin.

The safety switch 100 will be explained using the schematic diagram of FIG. 27. The length L of the switch body 102 in the Y-axis direction is larger than the diameter of the suction surface 130a. In an electromagnet to which a certain current is applied, the strength of the attraction force by the electromagnet is proportional to the number of turns of the coil. Therefore, in order to achieve a constant attraction force without increasing the diameter of the attraction surface 130a, the electromagnet 130 of this embodiment has a constant length in the front-rear direction. If there is a limit to the length of the entire switch body 102 in the front-rear direction, that is, in the Y-axis direction, the longer the length of the electromagnet 130 in the front-rear direction, the more difficult it becomes to form a housing portion behind the electromagnet 130. According to the configuration in which the length L of the switch body 102 in the Y-axis direction is larger than the diameter of the attraction surface 130a, the housing Hg in which the housing portion is formed can be disposed behind the electromagnet 130, so that the switch body 102 does not have an opening. The area occupied can be reduced. Further, in this embodiment, the total length L0 of the switch body 102 and the actuator 104 is designed to be larger than the diameter of the suction surface 130a in the Y-axis direction.

PF protective fence (section fixed part)
PD opening/closing door (movable part)
2 Door opening frame S Working area surrounded by a protective fence 100 Safety switch with electromagnetic locking mechanism of the embodiment 102 Switch body 104 Actuator 120 Actuator iron piece (magnetized member)
120a Adsorption surface 124 Actuator communication section (actuator coil)
130 Electromagnet 130a Adsorption surface 130b Mounting part 132 Board housing part Hg Housing 140a Electromagnet core Yk Electromagnet yoke part 142 Display part 144 Connector connection part 152 Sensor side coil (antenna coil)
Cb Substrate Gp Gap

Claims (14)

A safety switch in which an actuator having a magnetized member on which an attracted surface is formed is installed so as to be movable relative to the switch body,
a detection unit that detects that the actuator is within a predetermined range with respect to the switch body;
an electromagnet having a front side formed with an attraction surface corresponding to the attraction surface of the actuator;
a lock input section receiving a lock signal for locking relative movement of the actuator;
a drive control unit that drives the electromagnet so that the attraction surface and the attraction surface are attracted to each other based on the lock signal received by the lock input unit;
a safety control unit that generates a safety signal based on detection by the detection unit;
A safety switch comprising: a casing forming a housing section for accommodating the drive control section and the safety control section on the back side of the electromagnet. The safety switch according to claim 1,
A safety switch comprising one or more control boards on which the drive control section and the safety control section are mounted. The safety switch according to claim 1,
The electromagnet is a safety switch connected to the housing on the back side. The safety switch according to claim 1,
The switch body is a safety switch, further comprising a display section on the back side of the electromagnet that shows a detection result by the detection section. The safety switch according to claim 4,
The switch body further includes a mounting part for attaching the switch body to an installation location,
The display section is a safety switch that is provided at a position that is visible from the side opposite to the surface where the mounting section of the switch body is located. The safety switch according to claim 4,
A safety switch, wherein a connector connection portion is provided on the back side of the switch body. The safety switch according to claim 4,
A safety switch in which the display section is tilted forward. The safety switch according to claim 1,
The attracting surface of the electromagnet is smaller than the attracting surface of the actuator,
The detection unit includes an antenna coil that exchanges wireless signals with an actuator coil provided in the actuator,
In a first state in which the attracting surface of the electromagnet and the attracting surface of the actuator that is in contact with the attracting surface face each other and the attracting surface and the attracting surface are in contact with each other, the magnet is located at a position facing the actuator coil. A safety switch, in which the antenna coil is provided. The safety switch according to claim 8,
A safety switch, wherein the electromagnet is provided with a protrusion near a position where the antenna coil is provided to reduce an influence on the antenna coil due to driving of the electromagnet. The safety switch according to claim 8,
The safety switch, wherein in the first state, the protruding portion and the attracting surface face each other with a gap interposed therebetween. The safety switch according to claim 1,
The drive control section is a safety switch that drives the electromagnet so that the attraction surface and the attraction surface are attracted to each other based on the detection result by the detection section and the lock signal received by the lock input section. The safety switch according to claim 1,
A safety switch, wherein the electromagnet is formed with a mounting portion for attaching the switch body to an installation location. The safety switch according to claim 1,
comprising a metal member connected to the electromagnet,
A safety switch, wherein the metal member is formed with a mounting portion for attaching the switch body to an installation location. A safety switch in which an actuator having a magnetized member on which an attracted surface is formed is installed so as to be movable relative to the switch body,
a detection unit that detects that the actuator is within a predetermined range with respect to the switch body;
an electromagnet having a front side formed with an attraction surface corresponding to the attraction surface of the actuator;
a lock input section receiving a lock signal for locking relative movement of the actuator;
a drive control unit that drives the electromagnet so that the attraction surface and the attraction surface are attracted to each other based on the lock signal received by the lock input unit;
a casing that is connected to the electromagnet through a connection section provided on the back surface thereof and forms a housing section that houses the drive control section and the safety control section;
The suction surface constitutes a front surface of the switch body,
In a first state in which the magnetized member of the actuator that is in contact with the attracting surface faces each other and the attracting surface and the attracted surface of the magnetized member are in contact with each other, the magnetized member and the A safety switch characterized in that the total length of the safety switch is greater than the diameter of the suction surface.

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