Cloth Piercing and Cutting Force Evaluation for Fastener Mounting
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Solution Overview
Problem
Conventional methods for evaluating the suitability of mounting members for buttons or eyelets on cloths are inadequate as they do not effectively assess the piercing and cutting properties of cloths, leading to mounting defects despite suitable thickness measurements.
Innovation Solution
A cloth evaluation apparatus with a measuring member that includes a piercing force measuring portion with a gradually decreasing outer diameter and a cutting force measuring portion with a shear face, capable of detecting loads applied during the passing-through process, supported by a cloth supporting mechanism to prevent cloth displacement and ensure accurate force measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cloth thickness is measured under predetermined pressure, then the thickness parameter is obtained, but the piercing property and cutting property cannot be accurately evaluated
Solution Approach 1:
The measuring member is divided into distinct functional segments: a piercing force measuring portion with a gradually decreasing outer diameter for piercing evaluation, and a cutting force measuring portion with a shear face for cutting evaluation. This segmentation allows separate measurement of piercing and cutting properties that cannot be obtained through single thickness measurement.
Solution Approach 2:
The invention changes the measurement parameter from static cloth thickness to dynamic force parameters (piercing force and cutting force) during the passing-through process. By measuring the load applied to the measuring member as it pierces and cuts the cloth, the apparatus captures the actual mechanical interaction characteristics that determine mounting suitability.
2Reliability
If cloth thickness is used to determine mounting suitability, then the evaluation process is simple, but mounting defects still occur due to inadequate assessment of piercing and cutting properties
Solution Approach 1:
The measuring member is designed with multi-functionality, incorporating both piercing force measurement capability (through the gradually decreasing diameter portion) and cutting force measurement capability (through the shear face portion) in a single integrated component. This allows comprehensive evaluation of both piercing and cutting properties using one apparatus rather than requiring separate measurement devices.
Solution Approach 2:
The measuring member acts as an intermediary tool that simulates the actual mounting process by physically piercing and cutting through the cloth with its specialized geometry. The load detected during this intermediary process provides direct information about the cloth's resistance to piercing and cutting, which correlates with mounting quality without requiring actual button mounting trials.
3Force
If a sharp part of mounting member pierces the cloth by expanding grain, then piercing occurs but the force required varies with cloth material and weaving
Solution Approach 1:
The measuring member's piercing force measuring portion is designed with a gradually decreasing outer diameter that automatically adapts to different cloth types. As the measuring member is pushed through the cloth, the varying grain expansion forces naturally regulate the penetration process, and the load detecting means automatically records the piercing force without requiring manual intervention or adjustment for different cloth materials or weaving patterns.
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 precise evaluation of piercing and cutting properties, allowing for advanced determination of suitable mounting members, reducing the likelihood of button detachment and improving mounting accuracy.
Implementation Method 1
a load detecting means for detecting a load being applied to the measuring member while the measuring part passes through the cloth
Implementation Method 2
the piercing force measuring portion can pass through the cloth while expanding a grain of the cloth
Implementation Method 3
the cutting force measuring portion having a shear face which can push a part of the cloth in the passing direction to separate the part from the cloth
Data Source
AI summary
A cloth evaluation apparatus can grasp the piercing property and the cutting property with a cloth in advance. The cloth evaluation apparatus includes a measuring member having, on its distal side, a measuring part to pass through a cloth; a cloth/measuring part moving means for moving the cloth or the measuring member so that the measuring part passes through the cloth; a cloth supporting means for supporting the cloth at around a passing-through point, in the cloth, of the measuring part from both sides of the cloth when the measuring part passes through the cloth; and a load detecting means for detecting a load being applied to the measuring member while the measuring part passes through the cloth.