Take-up stroke adjustable structure and sewing machine

Abstract

The invention belongs to the technical field of sewing machines, and relates to a take-up stroke adjustable structure and a sewing machine. The take-up stroke adjustable structure comprises an upper shaft, an eccentric wheel I arranged on the upper shaft in a sleeving mode, and an eccentric wheel II arranged on the eccentric wheel I in a sleeving mode, wherein the eccentric wheel II can rotate on the eccentric wheel I to adjust the eccentricity dimension. A connecting rod is arranged outside the eccentric wheel II in a sleeving mode; the other end of the connecting rod is connected to a crank, and the crank is arranged on a take-up shaft; the upper shaft rotates and drives the eccentric wheel I and the eccentric wheel II to rotate, the eccentric wheel II drives the connecting rod to move vertically, and the vertical motion of the connecting rod is converted into rotary swing of the take-up shaft through the crank. Adjustment of the eccentricity dimension is achieved by arranging the eccentric wheel I and the eccentric wheel II on the upper shaft, so that change of the rotation angle of the take-up shaft is achieved, adjustment of the take-up amount is achieved, the tightness of needle thread is better adjusted, the university of the sewing machine is greatly improved, the use cost is reduced, and stitch optimization is achieved.

Description

technical field [0001] The invention belongs to the technical field of sewing machines, and relates to a thread take-up stroke adjustable structure and a sewing machine. Background technique [0002] When doing sewing work, the sewing material has different thicknesses. In the face of different types of sewing materials, the thickness of sewing will change greatly. In order to better adapt to different situations, it usually needs to be realized by a special thick material machine or thin material machine, which leads to poor machine versatility. , reducing work efficiency. [0003] The existing pick-up structure is as follows (such as figure 1 As shown): includes an upper shaft 1, on which an eccentric wheel 2 is arranged, one end of the connecting rod 3 is sleeved on the eccentric wheel 2, and the other end is connected to the crank 4, and the crank 4 is fixed on the thread take-up shaft 5, on this thread take-up shaft 5, also be provided with longer than wire plate. I...

AI Technical Summary

Problems solved by technology

[0004] Since the eccentric size of the eccentric wheel on the upper shaft is fixed, the corresponding eccentric size can only be set for thick materials and thin materials, so as to be suitable for sewing between thick materials and thin materials

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