Thread cutting device for sewing machine

Abstract

The invention relates to the technical field of sewing machines, and discloses a thread cutting device for a sewing machine. An electric heating cutting knife on a push plate is driven by a driving device to move on a needle plate, so that a sewing thread is subjected to hot melting and cut off, the sewing thread does not need to be lengthened during the cutting, the electric heating cutting knifeis directly attached to the position of a needle hole to perform hot melting and cut off a sewing upper thread a sewing base thread, short thread residues are implemented, the short thread residues remain in the inner surface of a sewing material, and the thread residues do not need to be manually cut by a pair of scissors subsequently. At the same time, since the thread residues of the sewing upper thread and the sewing base thread are short, a bird nest prevention effect can be effectively achieved, and the sewing material attractiveness is maintained. In addition, the sewing thread is cutby using the electric heating cutting knife, the sewing thread can be instantly subjected to hot melting and cut off under the action of the high-temperature electric heating cutting knife, a hot meltthread residue similar to a mushroom head is formed at the end of the thread, so that the thread residue end can be prevented from branching, and the end of the thread residue of the upper thread canbe prevented from falling off from a machine needle.

Description

technical field [0001] The invention relates to the technical field of sewing machines, in particular to a thread cutting device for sewing machines. Background technique [0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material to interweave or sew one or more layers of sewing material. The sewing machine can sew fabrics such as cotton, hemp, silk, wool, and artificial fibers, and products such as leather, plastics, and paper. The stitches that are sewn are neat and beautiful, flat and firm, and the sewing speed is fast and easy to use. [0003] The structure of the existing sewing machine thread cutting device is relatively complicated. It is necessary to pick out the sewing thread of the machine needle with the thread hooking structure first, and then clamp the sewing thread to the cutter through the thread clamping structure for thread cutting. In the process of thread clamping and thread clamping, th...

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Problems solved by technology

[0003] The structure of the existing sewing machine thread cutting device is relatively complicated. It is necessary to pick out the sewing thread of the machine needle with the thread hooking structure first, and then clamp the sewing thread to the cutter through the thread clamping structure for thread cutting. In the process of thread clamping and thread clamping, the sewing thread will be stretched virtually. After the thread trimming is completed, a long thread end will be left on the sewing material. Later, the thread end needs to be manually trimmed with scissors to maintain the aesthetics of the sewing material. Manual trimming of the thread end will consume A lot of labor cost and time cost, and the production efficiency is low; at the same time, after thread trimming, the thread ends of the upper thread and the lower thread are too long, and when the next sewing starts, the upper thread remains on the presser foot and the lower thread at the beginning of the sewing thread ball Accumulation, forming a messy thread knot, that is, a "bird's nest"-like thread cluster appears on the bottom line of the fabric, which seriously affects the appearance of the product and the sewing quality

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