Lockstitch sewing machine and upper thread cutting mechanism for lockstitch sewing machine

Abstract

The invention relates to a lockstitch sewing machine and an upper thread cutting mechanism for the lockstitch sewing machine. The upper thread cutting mechanism for the lockstitch sewing machine comprises a presser foot component, a fixed cutter, a movable cutter and a compressed spring, wherein the presser foot component comprises a presser foot plate arranged on the lower part of a machine head; the presser foot plate is located on a needle plate; the fixed cutter is fixedly arranged on the presser foot plate; a blade of the fixed cutter is faced forward; the moveable cutter is moveably arranged on the fixed cutter and is connected with a driving mechanism; the driving mechanism can drive the moveable cutter to slide back and forth on the fixed cutter; the compressed spring and the presser foot plate are fixedly connected with each other and are resisted against the moveable cutter; and a hook slot is formed on the moveable cutter. According to the invention, when the lockstitch sewing machine enters into the next sewing process, a thread residue is not brought into the bottom of a sewn cloth at the beginning of the sewing, and meanwhile, the clamped thread residue is close to a needle eye, so that the length from the sewing thread residue to the needle eye is short enough, the bird nest-shaped twisted thread on the sewn cloth is avoided and the aesthetics of the cloth sewn by the lockstitch sewing machine is greatly promoted.

Description

technical field [0001] The invention relates to an upper thread trimming mechanism of a lockstitch sewing machine and the lockstitch sewing machine. Background technique [0002] At present, in the textile industry, the sewing machine presser foot is a component used to exert pressure on the surface of the sewing material. The presser foot is divided into a lockstitch sewing machine presser foot, an overlock sewing machine presser foot, etc. according to its sewing machine performance. Computerized lockstitch sewing machines have almost been used in the production of existing clothing and leather goods. When the computerized lockstitch sewing machine finishes sewing, it will automatically cut off the bottom thread and upper thread under the needle plate. If the upper thread is left on the presser foot, continue to the next sewing process. During work, due to the fast action of the lockstitch sewing machine, the thread ends will be piled up under the sewing material at the b...

AI Technical Summary

Problems solved by technology

[0005] Another object is to provide a lockstitch sewing machine, which is used to solve the problem that the thread ends of the locket sewing machine in the prior art are piled up under the sewing material to form a bird's nest of thread balls during the sewing process

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