Knit Design Apparatus Yarn Catching Prevention
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Solution Overview
Problem
In intarsia knitting, yarns from adjacent pattern portions can get caught at the boundary, leading to unclear patterns, especially at smaller gauges and higher speeds, and existing solutions either prevent catching by splitting stitch rows or lower knitting efficiency.
Innovation Solution
A knit design apparatus that detects potential yarn catching using detection means and modifies knitting data to replace specific stitches with miss stitches or stitches from adjacent pattern portions, preventing yarn catching without reducing knitting speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If knitting is performed at high speed with small gauge, then productivity is improved, but yarn catching occurs more frequently at pattern boundaries
Solution Approach 1:
The system performs preliminary detection of potential yarn catching conditions by analyzing the relationship between needle positions, yarn feeder positions, and carriage travel direction before knitting occurs. When a problematic condition is detected, the carriage travel direction is reversed in advance to prevent the yarn catching issue from occurring during high-speed knitting operations
2Reliability
If stitch rows are split into two separate courses, then yarn catching is prevented, but knitting efficiency is reduced
Solution Approach 1:
Instead of statically splitting all stitch rows into two separate courses, the system dynamically determines whether to split based on real-time analysis of needle allocation, yarn feeder positions, and carriage travel direction. The carriage travel direction is dynamically reversed only when necessary to prevent yarn catching, allowing continuous knitting in most cases and maintaining high efficiency while preventing yarn catching when needed
3Productivity
If needle allocation at pattern boundaries is not carefully controlled, then knitting speed is maintained, but pattern clarity is reduced due to yarn catching
Solution Approach 1:
The system incorporates feedback mechanisms that continuously monitor needle allocation, yarn feeder positions, and carriage travel direction. When the analysis indicates a potential yarn catching condition at a pattern boundary, the system provides feedback to reverse the carriage travel direction, thereby maintaining both high knitting speed and clear pattern definition by preventing yarn catching
Data Source
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AI summary
In a course in which a cam system (C1) on the front side in the travelling direction of a carriage (34) of a flat knitting machine (32) knits a first knitted fabric (A) on the rear side in the travelling direction with respect to the boundary between intarsia pattern portions and a cam system (C2) on the rear side in the travelling direction knits a second knitted fabric (B) on the front side in the travelling direction with respect to the boundary, a knit design apparatus (2) detects from knitting data a stitch that is at an end of the first knitted fabric (A) and that projects further to the front side in the travelling direction than a course knitted immediately before, as a first stitch (K3-2, 45). In a case where the first stitch (K3-2, 45) is detected, a second stitch (46) in the second knitted fabric (B) positioned one course below the first stitch (K3-2, 45) is replaced by a miss stitch.