Rotary Type Switch
A rotary switch is a switch operated by rotation. These are often chosen when more than 2 positions are needed, such as a three-speed Fan or a FM Radio with multiple Frequencies of reception or “channels”.
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It is operated by rotating a shaft. Once the shaft reaches a set number of rotations or sets angle the switch gets activated.
Rotary limit switches are preferred where the adjustment of limits of travel is required frequently.
An important application is in overhead cranes for hoisting and lowering motion.
Lever-type limit switch
In the case of the lever type limit switch, the actuating arm is a rod connected to a lever shaft which is free to rotate when the rod is dislocated.
If you are looking for more details, kindly visit Safety Limit Switch.
When the forces displaying rod are removed, the lever shaft is returned to its normal state by a return spring.
The lever shaft has a roller mounted on its bottom, which rotates a rocker as it changes its position from right side to left side.
The mechanical action operates one are more contacts which are mounted on the other side of the limit switch as shown in the above figure.
The electrical contact may be open or close initially. The action of the actuator and lever arms takes it from one state to the other state. Hence normally open limit switch will be closed and when activated and the closed switch will be open when actuated.
Push Type Limit Switch
In the push type limit switch in the above figure, the contact gets operated from the depression of the contact lever arm.
Momentary Contact
When the target comes in contact with the actuator arm, it makes to move the actuator from the free position to the operating position.
At this point, the electrical contacts also change the state. When the target moves away, the actuating arm and also the contacts become normal.
For more information, please visit Plunger Limit Switch.
Maintained Contact
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