Knitting Machine Stitch-Length Control for Consistent Garment Sizing
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Solution Overview
Problem
Conventional knitting machines require trial and error to achieve consistent garment sizes, especially for small production runs, leading to significant wastage and inefficiency when producing unique or custom-designed items with varying pattern densities.
Innovation Solution
A method and apparatus that control stitch length and tension dynamically based on pattern density, using a multivariate model to determine optimal stitch lengths and tensions for each stitch, allowing for precise control of fabric dimensions and consistency across the entire article.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If trial and error calibration is used to achieve consistent garment sizes, then manufacturing precision is improved, but productivity deteriorates due to time-consuming iterations and material wastage
Solution Approach 1:
The patent applies preliminary action by pre-calculating the optimal number of tucks for each stitch position based on pattern density before the knitting process begins. This eliminates the need for trial-and-error calibration during production, as the correct tuck settings are determined in advance through computational analysis of the pattern file, thereby maintaining manufacturing precision while significantly improving productivity.
Solution Approach 2:
The patent replaces the mechanical trial-and-error calibration process with a computational system that automatically analyzes pattern files and calculates optimal tuck settings. This substitution of mechanical adjustment with automated computational determination eliminates time-consuming iterations and material wastage while achieving consistent garment sizes.
2Ease of manufacture
If uniform stitch length is used across the entire fabric, then ease of manufacture is improved, but manufacturing precision deteriorates due to inconsistent pattern density causing variation in final garment dimensions
Solution Approach 1:
The patent applies local quality by varying the stitch length and tuck frequency locally according to the pattern density at each specific position. Regions with higher pattern density receive more tucks and adjusted stitch lengths, while lower density regions use fewer tucks. This localized adjustment ensures that each area contributes appropriately to the overall garment dimensions, achieving manufacturing precision while maintaining ease of manufacture through automated control.
Solution Approach 2:
The patent implements dynamics by making stitch length and tuck frequency variable rather than static. The system dynamically adjusts these parameters based on the local pattern density requirements, allowing the knitting machine to adapt stitch characteristics to different regions of the pattern. This dynamic adjustment resolves the contradiction by enabling both ease of manufacture through automation and manufacturing precision through position-specific optimization.
3Adaptability or versatility
If high pattern density is used to create detailed designs, then adaptability is improved, but manufacturing precision deteriorates due to increased yarn consumption and difficulty in maintaining consistent stitch tension
Solution Approach 1:
The patent applies parameter changes by systematically varying stitch length and tuck frequency according to pattern density requirements. For high-density pattern regions, the system adjusts parameters to accommodate increased yarn consumption and maintain proper tension, while low-density regions use different parameter settings. This parameter adaptation enables detailed pattern designs with high adaptability while maintaining manufacturing precision through computationally determined optimal settings for each region.
4Loss of substance
If traditional knitting control is used for small production runs, then loss of substance is worsened due to significant material wastage during calibration, but device complexity is improved by using standard procedures
Solution Approach 1:
The patent replaces traditional mechanical trial-and-error calibration with a computational control system that pre-calculates optimal tuck settings based on pattern analysis. This substitution eliminates material wastage during calibration by determining correct settings before production begins, while the added device complexity is offset by the use of standard computational algorithms and automated machine control.
Solution Approach 2:
The patent implements self-service by enabling the knitting machine's control system to automatically analyze pattern files and determine optimal tuck settings without external intervention or manual calibration. The system serves itself by computing the necessary parameters from the pattern data, eliminating the need for operator trial-and-error adjustments and the associated material wastage, while maintaining manageable device complexity through automated self-determination.
Data Source
Figure 1A~1B
Figure 1C
Figure 1D
AI summary
The invention provides a method and apparatus for knitting a fabric using a knitting machine, wherein the knitting machine is arranged to knit with a plurality of yarns using a corresponding plurality of knitting needles, each knitting needle being arranged during knitting of a stitch to connect with and knit with one of the plurality of yarns; the method comprising controllably varying the stitch length for each stitch in dependence on the pattern to be knitted.