a sewing machine

Abstract

The invention provides a sewing machine, which belongs to the technical field of sewing machines. The utility model solves the problem of long thread ends remaining on the cloth after thread trimming of existing sewing machines. The sewing machine includes a bottom plate and a casing, the casing is provided with machine needles, the bottom plate is rotatably connected with a lower shaft and a drive shaft, the end of the lower shaft is rotatably connected with a moving knife rest, and the moving knife rest is fixedly connected with a moving knife. The shaft is connected to the movable knife rest and can drive the movable knife rest to rotate. The fixed knife is slidably connected to the bottom plate, and the drive plate is hinged on the bottom plate. The distance between the guide surface and the axis of the lower shaft gradually decreases from one end to the other. When the movable knife rest rotates and moves the movable knife towards the fixed knife, the drive plate can make the fixed knife close to the needle. This sewing machine can shorten the thread end after cutting and improve the thread cutting quality.

Description

technical field [0001] The invention belongs to the technical field of sewing machines, and relates to a sewing machine. Background technique [0002] Most of the industrial sewing machines are general-purpose sewing machines, including lockstitch sewing machines, chain stitching machines, quilting machines, overlock sewing machines and interlock sewing machines, etc., and lockstitch sewing machines have the highest utilization rate. With the continuous adjustment of the market and consumption structure, medium and low-speed industrial sewing machines can no longer meet the production needs. Sewing machines are developing towards high-speed and serialization. Electronic and computer technologies are widely used in sewing machines. The internal structure of the sewing machine is complicated, including the presser foot lifting device, the thread trimming mechanism, etc. [0003] Such as the Chinese invention patent application (application number: 201010602851.5) discloses a ...

AI Technical Summary

Problems solved by technology

The thread cutting device can realize the cutting of the suture, but the fixed knife does not move when the moving knife moves. In order to avoid cutting the suture by the fixed knife during the sewing process, usually the fixed knife needs to keep a certain distance from the needle , the distance is roughly 3 to 4 mm. When thread trimming is required, the moving knife moves to the fixed knife and cuts the suture at the fixed knife. After the suture is cut, the thread ends are located at the fixed knife, so the remaining thread ends on the fabric are longer

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