Limit Switch with Configurable Plunger Cam Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a growing demand for limit switches that can operate in either one-side or both-side modes, where the built-in switch is activated only when the shaft rotates in one direction, but not the other, to accommodate diverse industrial applications.
Innovation Solution
A limit switch design featuring a switch main body, an operation unit with a housing, a rotatable shaft, a cam portion, a biasing portion, and a plunger that can be configured to set the operation mode to either one-side or both-side operation by adjusting the contact positions of the plunger with notches and protruding portions on the cam and plunger.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the limit switch is designed for both-side operation only, then the switch can be activated in both forward and reverse directions, but the adaptability to diverse industrial applications requiring one-side operation is limited
Solution Approach 1:
The plunger is designed with multiple contact portions (first, second, third contact portions) that can be selectively positioned to engage with different protruding portions on the cam. This dynamic configuration allows the same switch structure to adapt between one-side operation mode (using only first or second contact portion) and both-side operation mode (using both first and second contact portions), thereby improving adaptability without requiring multiple different switch designs.
Solution Approach 2:
The cam is designed with multiple protruding portions (first and second protruding portions) that can engage with different contact portions of the plunger. This universal design enables the cam mechanism to serve multiple functions: it can activate the switch in both-side operation mode by engaging both protruding portions, or in one-side operation mode by engaging only one protruding portion, thus providing versatility across different industrial applications.
2Adaptability or versatility
If the plunger is configured with multiple contact portions for mode selection, then operation mode flexibility is improved, but the device complexity increases
Solution Approach 1:
Multiple contact portions are integrated into a single plunger component rather than using separate components for each contact point. The first, second, and third contact portions are merged into one plunger body, which simplifies the overall structure compared to using multiple independent components while still providing the capability for operation mode selection through the different contact configurations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable operation mode selection between one-side and both-side modes, enhancing operational flexibility and reliability by ensuring the switch is activated only when intended, thus meeting the demands of various industrial applications.
Implementation Method 1
a biasing portion that is disposed inside the housing and biases the cam portion in a second direction intersecting the first direction and in a direction approaching the switch main body to return the shaft main body to the return position
Data Source
AI summary
A limit switch includes: a switch main body capable of being switched on and off; and an operation unit connected to the switch main body. The operation unit includes: a housing having a box shape; a shaft portion including a shaft main body and a cam portion the shaft main body being supported by the housing in a state of being rotatable forward from a return position toward a first operation position around a rotation axis extending in the first direction and being rotatable backward from the return position toward a second operation position opposite to the first operation position with respect to the return position, the cam portion being provided in the shaft main body located inside the housing and being configured to rotate forward and backward together with the shaft main body; a biasing portion configured to return the shaft main body to the return position; and a plunger configured to move in the second direction by rotation of the cam portion to switch on and off of the switch main body, and configured to be able to set an operation mode from either one-side operation or both-side operation.