Fixture Positioning Switch With Electrical Seating Detection
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Solution Overview
Problem
The frequent misloading of parts in machining fixtures during high-force grind operations leads to nonconformities and scrap, which are often undetected until later stages, causing unknown scrap quantities and quality nonconformance.
Innovation Solution
A switch mechanism with a housing and cap assembly, biased axially by a spring, is integrated into the machining fixture to ensure proper part seating, using electrical contacts to verify correct loading and prevent misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If operator manually checks part loading with shim, then part positioning accuracy can be verified, but operator error and misloading still occur frequently
Solution Approach 1:
The patent replaces the manual mechanical checking method (operator using shim) with an automated electrical sensing system. Position switches with electrical contacts detect whether the part is properly seated on the fixture, eliminating reliance on operator skill and attention, thus resolving the contradiction between achieving precise positioning and operator reliability.
Solution Approach 2:
The fixture performs self-verification of part loading through the electrical switch system. The part itself completes the electrical circuit when properly positioned, providing automatic feedback without requiring external operator intervention, thereby improving both positioning accuracy and operational reliability.
2Device complexity
If no real-time detection of misloading is implemented, then fixture design remains simple, but nonconformities are detected only later causing unknown scrap quantities
Solution Approach 1:
The patent implements immediate feedback through electrical switches that detect part positioning status in real-time during the machining process. This feedback mechanism provides continuous information about part loading correctness, enabling immediate detection and correction of misloading, thus resolving the contradiction between maintaining simple fixture design and achieving real-time quality information.
Solution Approach 2:
The electrical detection system verifies proper part loading before the machining operation begins or during intermediate steps, preventing defective processing before it occurs. This preliminary verification action eliminates the need for complex post-processing inspection while maintaining simple fixture design.
3Adaptability or versatility
If multiple grinding steps are performed in successive fixtures, then complex features can be machined, but cumulative misloading errors increase quality nonconformance
Solution Approach 1:
Each fixture in the successive machining sequence is equipped with electrical switch feedback systems that independently verify part positioning accuracy. This continuous feedback across multiple operations prevents cumulative error buildup by detecting and alerting to positioning deviations at each step, resolving the contradiction between multi-step machining versatility and cumulative precision.
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
Ensures accurate part positioning and immediate detection of misloading, reducing scrap and enhancing quality control by providing real-time feedback on part seating.
Implementation Method 1
a spring biases the cap axially away from the housing along the axial range of motion from the compressed condition to the extended condition
Implementation Method 2
A cap electrical contact and a housing electrical contact are respectively on the cap and the housing and have an electrically closed condition at the compressed condition
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A switch housing body (41) has a base (48) and a sidewall (50) having an axis (510) and extending from the base (48) to a rim (52) and having a pair of axial slots (70). A switch cap (34) has: a cap body (80) having a top web (82); and a sidewall (84) extending from the top web (82) to a rim (86) and having a pair of holes (106). A shaft (120) passes through the pair of axial slots (70) and pair of holes (106). A spring (42) biases the cap (34) axially away from the housing (40) from a compressed condition to an extended condition. A cap electrical contact (142) and a housing electrical contact (140) have an electrically closed condition at the compressed condition.