Thread trimming and presser foot lifting device for sewing machine

Abstract

The invention provides a thread-cutting presser foot lifter for sewing machinery, belongs to the technical field of clothing manufacture equipment and solves the technical problems that, for instance,a thread-cutting presser foot lifter of existing sewing machinery has poor applicability. A screwing machine comprises a bottom plate, a presser foot rod arranged above the bottom plate and a presserfoot fixedly connected to the lower end of the presser foot rod; a thread cutting mechanism is also arranged right below the presser foot at the bottom of the bottom plate. The thread-cutting presserfoot lifter comprises a driving motor fixed to the bottom of the bottom plate and having two output shafts; the output shaft at one end of the driving motor is fixedly connected with a presser foot lift cam; a linkage is arranged above the bottom plate; the presser foot lift cam can drive the presser foot rod to rise through the linkage; the output shaft at the other end of the driving motor is fixedly connected with a thread-cutting cam; the thread-cutting cam can drive the thread cutting mechanism to do cutting motion. The thread-cutting presser foot lifter herein is widely applicable and reliable in performance.

Description

technical field [0001] The invention belongs to the technical field of garment manufacturing equipment, and relates to a sewing machine, in particular to a thread trimmer and presser foot lifting device of the sewing machine. 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, fiber crops, silk, wool, and artificial fibers, and products such as leather, plastics, and paper. Sewing machines are generally composed of four parts: feeding device, machine base, transmission and accessories. The movement of each mechanism is reasonably coordinated, and the cycle works to sew the sewing materials together. During the sewing process, the sewing machine will use the functions of automatic thread trimmer and automatic presser foot lifter; currently, sewing machines on the market ...

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned patent documents, a stepping motor is used as the driving source to realize the functions of thread trimming and presser foot lifting, but its thread trimming mechanism is not suitable for long-distance transmission, and its structural adaptability is poor; There is a knee lift presser foot device, poor versatility

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