Electronic yarn trapper and sewing machine

Abstract

The invention provides an electronic yarn trapper. The electronic yarn trapper comprises an electromagnet housing, an electromagnet coil, an iron core, a return spring, a yarn trapping cover plate, anadjusting bolt and an adjusting nut, wherein the electromagnet coil is mounted in the electromagnet housing; the iron core is matched with the electromagnet coil; the yarn trapping cover plate is fixed to the iron core; the adjusting bolt is parallel to the iron core; and the adjusting nut is connected with the adjusting bolt through threads; the two ends of the return spring abut against the electromagnet housing and the iron core, respectively; a yarn through groove allowing an upper thread to penetrate through is formed between the electromagnet housing and the yarn trapping cover plate; and the adjusting nut is arranged on one side, far away from the yarn through groove, of the yarn trapping cover plate and abuts against the yarn trapping cover plate. According to the electronic yarntrapper, the size of the yarn through groove is adjustable; when the thickness of the upper thread and the sewing speed of a first stitching of the sewing machine are changed, the working delay angleof the yarn trapper can be adjusted by adjusting the size of the yarn through groove so that the working delay angle of the yarn trapper is always kept within a range; and therefore, the working delayangle of the yarn trapper is controllable, and the stability of the working delay angle of the electronic yarn trapper is improved.

Description

technical field [0001] The invention relates to an electronic wire clamp. [0002] The present invention also relates to a sewing machine equipped with the above-mentioned electronic thread tensioner. Background technique [0003] At present, electronic thread clamps are usually installed in sewing machines to eliminate the "bird's nest" phenomenon and improve sewing quality; for example, a sewing machine thread clamping mechanism disclosed in the Chinese Utility Model Patent Application No. It is an electronic thread tensioner; another example is an electronic thread tensioner for sewing machines disclosed in Chinese Utility Model Patent No. 201420557309.6. After the last sewing is completed and the thread is trimmed, and when the first stitch is started next time, the electronic thread clamp works to clamp the section of upper thread between the needle side and the thread supply cylinder. The needle carries the upper thread and stabs the material downwards. The hook hook...

AI Technical Summary

Problems solved by technology

During actual sewing, the thickness of the upper thread and the sewing speed of the first stitch of the sewing machine are constantly changing, which causes the working delay angle of the electronic thread tensioner to be very unstable and uncontrollable, resulting in premature or premature loosening of the thread by the electronic thread tensioner. Night

When the electronic thread clamp loosens the thread too early, the upper thread ends cannot be brought to the back of the sewing material, which affects the appearance of the sewing material; when the electronic thread clamp loosens the thread too late, it is easy to cause the thread to come off , the end of the upper thread comes out of the needle hole of the needle

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