A sewing machine presser foot automatic thread trimming mechanism

Abstract

The invention relates to an automatic thread shearing mechanism of a presser of a sewing machine. The automatic thread shearing mechanism of the presser of the sewing machine comprises a workbench, a sewing machine head and the presser, wherein the presser comprises a pressing rod and a pressing plate, a thread shearing groove in parallel with the surface of the workbench is formed in the pressing plate, a thread shearing knife is installed in the thread shearing groove, the thread shearing knife comprises a fixed blade and a movable blade, the fixed blade is located below the movable blade and is fixedly arranged in the thread shearing groove, a cutting edge is arranged at a position, corresponding to a sewing stitch, of the front part of the fixed blade, a pin hole is formed in the pressing rod, a rotating shaft is contained in the shaft hole, the lower end of the rotating shaft is fixedly connected with the rear end of the movable blade, the upper part of the rotating shaft is connected with an output end of a driving device through a connecting rod device, the driving device can drive the rotating shaft to leftwards and rightwards rotate back and forth through the connecting rod device, and the front part of the movable blade oscillates leftwards and rightwards above the cutting edge of the fixed blade with the rotation of the rotating shaft. The automatic thread shearing mechanism of the presser of the sewing machine can enable the surface of a sewn fabric not to have thread ends, can prevent overlapped thread stitches and thread ends from occurring on the surface of the sewn fabric, and has the features of reasonable structure, convenience in use and good effect.

Description

technical field [0001] The invention relates to sewing machine technology, in particular to an automatic thread trimming mechanism for a sewing machine presser foot. Background technique [0002] The sewing machine will leave a section of thread ends and overlapping stitches on the fabric after one sewing. A garment needs many times of sewing to complete, so a lot of thread ends and overlapping stitches will be left on the surface of the garment after sewing. These threads can be In the later stage, it is trimmed manually, and overlapping threads cannot be trimmed. Therefore, some high-end garments with overlapping stitches will be treated as defective products; and even thread ends, because there are too many thread ends, it is impossible to trim them one by one manually, and generally only longer ones The thread ends are trimmed, although the remaining thread ends are not long, but too many thread ends make the surface of the garment unattractive; in addition, the efficien...

AI Technical Summary

Problems solved by technology

[0002] The sewing machine will leave a section of thread ends and overlapping stitches on the fabric after one sewing. A garment needs many times of sewing to complete, so a lot of thread ends and overlapping stitches will be left on the surface of the garment after sewing. These threads can be In the later stage, it is trimmed manually, and overlapping threads cannot be trimmed. Therefore, some high-end garments with overlapping stitches will be treated as defective products; and even thread ends, because there are too many thread ends, it is impossible to trim them one by one manually, and generally only longer ones The thread ends are trimmed, although the remaining thread ends are not long, but too many thread ends make the surface of the garment unsightly; in addition, the efficiency of manual trimming of the thread ends is very low, and under the current conditions of high labor costs, it will undoubtedly increase the cost and reduce the cost performance of the product

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