Safety switch

Abstract

The display unit remains visible even when the safety switch body is located inside the operating area. [Solution] The safety switch (100) comprises a switch body (102) equipped with an electromagnet (130) and an actuator (104) that is attracted by the electromagnet (130). The front end surface of the switch body (102) is formed by the attraction surface (130a) of the electromagnet (130). A display unit (142) is provided on the back side of the electromagnet (130). The status of the safety switch (100) is displayed by the display unit (142).

Claims

1. A safety switch in which an actuator having a magnetized member on which an adsorption surface is formed is installed so as to be movable relative to the switch body, A detection unit that detects whether the actuator is within a predetermined range relative to the switch body, An electromagnet having an adsorption surface on its front side that corresponds to the surface to be adsorbed by the actuator, A lock input unit that receives a lock instruction to lock the relative movement of the actuator, A drive control unit drives the electromagnet so that the adsorption surface of the electromagnet and the adsorption surface of the actuator are attracted to each other, based on the lock instruction received by the lock input unit. A safety control unit that generates a safety signal based on the detection of the detection unit, A display control unit that generates state information based on the detection result by the detection unit, A safety switch comprising a display unit positioned on the rear side of the electromagnet and displaying state information generated by the display control unit.

2. A safety switch comprising an actuator having a magnetized member on which an adsorption surface is formed, and a switch body having an adsorption surface corresponding to the adsorption surface, The aforementioned switch body is A detection unit that detects whether the actuator is within a predetermined range relative to the switch body, An electromagnet with the aforementioned adsorption surface formed on the front side, A control board supplies a locking current to the electromagnet so that the adsorption surface and the surface to be adsorbed are attracted to each other, and generates state information based on the detection result by the detection unit, A housing provided on the rear side of the electromagnet, which houses one or more control boards, Equipped with, The housing is provided with a safety switch, which is positioned on the side behind the electromagnet and displays the status information.

3. The safety switch according to claim 1 or 2, characterized in that the display unit is positioned away from the suction surface in the direction normal to the suction surface.

4. The electromagnet is further provided with a housing connected to the electromagnet on its back side, The adsorption surface of the electromagnet and at least a portion of the side surface of the electromagnet are exposed. The safety switch according to claim 1, wherein the electromagnet and the housing give it a substantially cylindrical outer shape.

5. The electromagnet further comprises a housing connected to the electromagnet on its back side, The adsorption surface of the electromagnet and at least a portion of the side surface of the electromagnet are exposed. The safety switch according to claim 1, having a substantially rectangular prism shape due to the housing and the electromagnet.

6. The detection unit has an antenna coil that exchanges wireless signals with the actuator coil provided in the actuator, The safety switch according to any one of claims 2, 4, and 5, wherein the antenna coil is housed in the housing on the side of the electromagnet.

7. The safety switch according to claim 6, wherein the electromagnet is provided with a projection near the position where the antenna coil is installed, for reducing the influence on the antenna coil caused by the driving of the electromagnet.

8. The safety switch according to claim 1, wherein the display control unit generates the state information based on the detection result and the driving state of the electromagnet.

9. The switch body is provided with a mounting part for fixing it to the installation location, The safety switch according to claim 1 or 2, wherein at least a portion of the display portion is provided on the opposite side from the mounting portion in a circumference with respect to the direction of the normal to the suction surface.

10. The safety switch has an overall shape in which the length in the direction normal to the suction surface is greater than the diameter of the suction surface. The safety switch according to claim 1 or 2, wherein the suction surface constitutes one end face of the safety switch in the normal direction.

11. The safety switch according to claim 10, wherein the display unit is positioned at a distance of at least one-third of the total length of the switch body from the suction surface in the direction normal to the suction surface.

12. The safety switch according to claim 10, wherein the display unit is positioned at a distance from the suction surface that is more than half the total length of the switch body in the direction normal to the suction surface.

13. The safety switch according to claim 1 or 2, wherein the outer surface of the display unit has a curved cross-sectional shape.

14. The safety switch according to claim 1 or 2, wherein the outer surface of the display unit has a tapered shape toward the suction surface.

15. The safety switch according to claim 14, wherein the outer surface of the display unit has a curved cross-sectional shape.

16. A safety switch comprising a switch body positioned in a fixed partition portion of a partitioning system that demarcates an operating area in which the device operates, and an actuator installed on a movable portion that is movable relative to the fixed partition portion, The switch body is A detection unit that detects whether the actuator is within a predetermined range relative to the switch body, An electromagnet having an adsorption surface that is attracted to a magnetizing member provided on the actuator, The system includes a display unit that shows the detection results from the detection unit and is positioned so as to be hidden by the actuator when viewed in the direction normal to the adsorption surface, A safety switch characterized in that the display unit is positioned at a distance of more than half the total length of the switch body in the normal direction from the suction surface, in the normal direction from the suction surface.

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