Sewing Machine Control for Cord Thickness Consistency
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Solution Overview
Problem
The existing presser device for sewing machines experiences variations in cord thickness due to differences in tension direction, leading to inconsistent stitching quality when sewing decorative threads or cords.
Innovation Solution
A sewing machine equipped with a movement mechanism, swinging mechanism, presser device, guide portion, processor, and memory that corrects the positions of needle drop points in the pattern data to maintain consistent tension and reduce thickness variations, ensuring proper stitching by adjusting the length of main stitches based on the cord's supply direction and sewing object movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cord is supplied to the insertion hole in a specific direction, then the stitching process can be completed, but the cord thickness varies due to tension differences, causing inconsistent stitching quality
Solution Approach 1:
The system performs preliminary correction of pattern data before the actual stitching process. By calculating and adjusting the end point positions of main stitches in advance based on the supply direction of the cord, the system compensates for tension-induced thickness variations before they occur during stitching, ensuring consistent cord thickness and high stitching success rate
2Manufacturing precision
If the main stitch length is kept uniform in pattern data, then the pattern design is simple, but the cord thickness variations due to tension direction cannot be compensated
Solution Approach 1:
The system dynamically changes the end point position parameter of main stitches in the pattern data based on the supply direction of the cord. By adjusting this parameter according to directional tension characteristics, the system compensates for cord thickness variations while maintaining relatively simple pattern data structure with only end point position modifications
Data Source
AI summary
A sewing machine includes a movement mechanism, a swinging mechanism, a presser device, a guide portion, a processor, and a memory configured to store computer-readable instructions that, when executed by the processor, instruct the processor to perform processes. The processes include acquiring pattern data used for sewing a couching pattern in which a plurality of motifs are continuously arranged. The motif is configured in a predetermined shape by a plurality of stitches including a main stitch and a sub-stitch. The processes include correcting at least one selected from the group of a start point position and an end point position of the main stitch of one of the motifs, such that the length of the main stitch of the one motif is longer in a second case than in a first case, and driving the movement mechanism and the swinging mechanism in accordance with the corrected pattern data.