Guiding and threading structure in automatic threading device of industrial sewing machine

Abstract

The invention provides a guiding and threading structure in an automatic threading device of an industrial sewing machine, and belongs to the technical field of sewing. The technical problem that theautomation degree of threading of existing industrial sewing machines is low is solved. The industrial sewing machine comprises a shell, a side cover fixedly arranged at one end of the shell, a take-up lever and a frame needle. The frame needle is provided with a threading hole. The guiding and threading structure comprises a rotary connecting rod, a driving piece, a guide plate and a threading connecting rod. One end of the rotary connecting rod is fixedly provided with a silk clamping air cylinder and a silk ejecting air cylinder. The outer end of an output shaft of the silk clamping air cylinder is fixedly provided with a silk clamping plate. The silk clamping plate is provided with an open slot. An output shaft of the silk ejecting air cylinder is fixedly provided with an ejecting rodfacing the open slot. The rotary connecting rod and the guide plate are arranged on the two sides of the frame needle respectively. The threading connecting rod is slidably arranged on the guide plate. The end, facing the frame needle, of the threading connecting rod is fixedly provided with a flexible threading hook. By means of the guiding and threading structure, the automation degree of threading of the existing industrial sewing machines is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of sewing machines, and relates to an automatic threading device for an industrial sewing machine, in particular to a guiding and threading structure in the automatic threading device for an industrial 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; there is no automatic threading device on the current industrial sewing machine. In the event of thread breakage or needle breakage, manual threading is required, which is time-consuming and labor-intensive, especially causing great trouble to people with poor eyesight or the elderly. [0003] At present, some household sewing machines are equipped with automatic threading devices, such as some lockstitch sewing machines. Usually, the automatic threading devices on such sewing machines can...

AI Technical Summary

Problems solved by technology

[0006] In the threading device for sewing machines disclosed in the above-mentioned patent documents, the threading action still needs to be put into the thread hook groove by hand, and the degree of automation is relatively low.

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