Automatic thread-cutting device for cylindrical sewing machine

Abstract

This invention discloses an automatic tangent device of straight barrel-type sewing machine, aiming to hold the bottom line meanwhile with the needling thread cut off when a texture is sewed over. This device includes a thread-cutter, a coupled mechanism and a drive organ. The thread cutter consists of blade and upper and lower fixed blades. The blade should have the first cutting part and second cutting part. When the drive organ offers the driving power that drives the coupled cutting blade of the coupled device to move between the upper and lower blades, the thread is first cut off by the firs cutting part while the bottom line is held after being cut by the second cutting part. When the sewing machine is used again, it will be unnecessary to pull threads any more.

Description

technical field [0001] The present invention relates to an automatic thread cutting device of a straight cylinder sewing machine, in particular to a thread clamping device which cuts the yarn when sewing is completed by the thread cutting device and holds the subsequent yarn to be used. Background technique [0002] Sewing machine technology has developed quite well, and the technology can quickly manufacture garments, which has brought significant economic benefits to the textile industry. Thread trimmers for existing sewing machines, see figure 1 , 2 As shown, the thread cutting device of this existing sewing machine includes: first and second movable blades 61, 62 and first and second fixed blades 63, 64, and the first movable blade 61 is used for crochet thread (not shown in the figure) shown), then use the first fixed blade 63 to cut off, and the second movable blade 62 is used to hook the bottom yarn, use the second fixed blade 64 to cut off, and then hold the bottom...

AI Technical Summary

Problems solved by technology

Thread trimmers for existing sewing machines, see figure 1 , 2 As shown, the thread cutting device of this existing sewing machine includes: first and second movable blades 61, 62 and first and second fixed blades 63, 64, and the first movable blade 61 is used for crochet thread (not shown in the figure) shown), then use the first fixed blade 63 to cut off, and the second movable blade 62 is used to hook the bottom yarn, use the second fixed blade 64 to cut off, and then hold the bottom yarn (not shown in the figure), so there is The sewing machine needs to use two blades to cut the needle thread and the bottom yarn respectively, and the aforementioned first and second movable blades 61, 62 and the first and second fixed blades 63, 64 are all connected to the bottom of the needle plate 65. If you want to adjust The angles of the first and second movable blades 61, 62 and the first and second fixed blades 63, 64 need to be unloaded from the needle plate 65, adjusted on the needle plate 65, and finally locked. Return to the sewing table (not shown in the figure), if the needle plate 65 shakes during the process of locking back to the sewing table, it may cause errors in the previously adjusted angle, so it is very inconvenient

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