Sewing Machine Cutting Needle Dynamic Spacing Control
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Solution Overview
Problem
Existing sewing machines with cutting needles struggle to reliably cut thicker work cloths as they often leave uncut threads due to fixed needle drop point distances, leading to inefficiencies in cutting time for both thick and thin cloths.
Innovation Solution
A sewing machine equipped with a cloth thickness detection device and a control system that modifies the distances between needle drop points in the cut data based on the detected cloth thickness, allowing for dynamic adjustment of cutting parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distances between successive needle drop points are made smaller to reliably cut thicker work cloth, then the cutting reliability is improved, but the cutting time increases
Solution Approach 1:
The patent applies dynamics by making the needle drop point distances adjustable rather than fixed. The control device dynamically modifies the distances between successive needle drop points in the cut data based on the detected cloth thickness, allowing the system to adapt to different material thicknesses and optimize cutting performance for each specific condition.
Solution Approach 2:
The patent changes the parameter of needle drop point distances according to cloth thickness. The control device modifies the cut data by adjusting the distances between successive needle drop points based on the thickness detection result, thereby optimizing cutting reliability for thick cloths while maintaining efficiency for thin cloths.
2Reliability
If the distances between successive needle drop points are made smaller to cut thicker work cloth, then fewer uncut threads remain, but the number of needle drop points increases
Solution Approach 1:
The patent modifies the cut data parameters (distances between needle drop points) based on the detected cloth thickness. This allows the system to adjust the number and positioning of needle drop points dynamically, reducing uncut threads in thick cloths while managing data complexity through thickness-based optimization.
3Device complexity
If fixed cut data is used for all cloth thicknesses, then the device complexity is reduced, but cutting reliability decreases for thicker cloths
Solution Approach 1:
The patent implements parameter changes by modifying the cut data distances based on detected cloth thickness. This allows the system to maintain simplicity for thin cloths while automatically adjusting parameters for thick cloths, achieving high reliability without requiring completely different control systems for different material thicknesses.
Solution Approach 2:
The patent employs feedback by using the cloth thickness detection device to sense the actual thickness and then having the control device adjust the cut data accordingly. This feedback loop ensures that the cutting parameters are optimized for the specific cloth thickness being processed, improving reliability while keeping the control logic relatively simple.
Data Source
AI summary
A sewing machine includes a cloth thickness detection device, a storage device, and a control device. The cloth thickness detection device detects a cloth thickness of a work cloth. The storage device stores cut data that include a plurality of needle drop points for a cutting needle. The control device modifies a distance between adjacent ones of the needle drop points in the cut data in accordance with the cloth thickness that has been detected by the cloth thickness detection device. Then control device performs cut work on the work cloth using the cutting needle, in accordance with the cut data in which the distance between the adjacent needle drop points has been modified.