What Is a Position Switch?
A position switch is a contact-type sensor, also known as a touch switch or high-precision switch. It operates by activating when a movable pin at the end is pushed to a specific point by a sensing object. Known for their extremely high accuracy, position switches enable precise control and detection of an object’s position. They are crucial in applications requiring accuracy but must be installed correctly to ensure precise detection.
Position switches are similar to microswitches and limit switches but are distinct in their durability and accuracy, with some models capable of detecting positions in the micron range and enduring up to 3 million cycles.
Uses of Position Switches
- Manufacturing Industry: Used in assembly and production lines for accurate position detection and control of parts and products. In machining, they detect tool positions for precise cutting and machining and control robot arm positions.
- Medical: Used in medical equipment to detect specific positions or changes, such as in diagnostic imaging equipment and surgical support robots.
- Printing Machines: Used in printing presses to accurately control paper position and feed, ensuring proper operation of the print head and ink supply.
Principle of Position Switches
Position switches detect position through physical contact and consist of an actuator, contacts, and a spring. The actuator changes the switch state when pushed, the contacts open and close the electrical circuit, and the spring returns the switch to its original state.
How to Select a Position Switch
- Type of Actuator: Choose an actuator type based on the operating environment and application, such as pin plungers, top plungers, or bevel plungers.
- Operation Indicator Light: Consider whether an indicator light is necessary for visual confirmation of the switch status.
- Repetition Accuracy: Ensure the switch can repeatedly detect the same position with high accuracy, crucial for certain applications.
- Force Required for Operation: Select a position switch that requires an appropriate amount of force for operation, matching the application’s requirements.