Sewing machine

Abstract

The invention provides a sewing machine, and belongs to the technical field of sewing machines. The problem that for an existing sewing machine, after a thread is cut, the thread residue left on cloth is longer is solved. The sewing machine comprises a base plate and a machine shell, a frame needle is arranged on the machine shell, a lower shaft and a drive shaft are rotatably connected in the base plate, the end of the lower shaft is rotatably connected with a moving blade frame, a moving blade is fixedly connected to the moving blade frame, the drive shaft is in drive connection with the moving blade frame and can drive the moving blade frame to rotate, a fixed blade is connected with the base plate in a sliding mode, a drive plate is hinged to the base plate, the edge of the moving blade frame is provided with a guide surface in the circumferential direction, a tension part is connected to the drive plate, the distance between the guide surface and the shaft axis of the lower shaft is gradually decreased from one end to the other end, and when the moving blade frame rotates and enables the moving blade to move to the direction of the fixed blade, the drive plate can enable the fixed blade to be close to the frame needle. By means of the sewing machine, the thread residue which is cut is shorter, and the thread cutting quality is improved.

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 machines, chain stitch machines, quilting machines, overlock stitch machines and interlock stitch machines, among which lockstitch machines have the highest usage rate. With the continuous adjustment of the market and consumption structure, the medium and low-speed industrial sewing machines can no longer meet the production needs. The sewing machines are developing in the direction of high-speed and serialization. Electronic and computer technologies are widely used in sewing machines. The internal structure of the sewing machine is complex, including the presser foot lifter and the thread trimmer mechanism. [0003] For example, a Chinese invention patent application (application number: 201010602851.5) discloses a thread trimmi...

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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