Automatic variable presser foot mechanism of sewing machine

Abstract

The invention relates to an automatic variable presser foot mechanism of a sewing machine. The automatic variable presser foot mechanism of the sewing machine is characterized by comprising a presser foot height adjusting assembly and a presser foot travel adjusting assembly; the output shaft of a first electromotor of the presser foot height adjusting mechanism is connected with a first transmission shaft, an oscillating bar is a bend rod, and a fixing hinging point is arranged at the bend part of the oscillating bar; a fixing rod is provided with a fixed end and a free end, the fixed end is hinged and fixed to the sewing machine, the free end can rotate around the fixed end, the oscillating bar butts against the lower portion of the fixing rod, and thus the fixing rod is driven to rotate around the fixed end to adjust the up-and-down position of the free end; the output shaft of a second electromotor of the presser foot travel adjusting assembly is connected with a second transmission shaft, the second electromotor rotates, an adjuster is driven through the second transmission shaft and a connecting rod assembly, a connecting plate is driven to do swing movement around the free end of the fixing rod, and the height of a third connecting rod and the height of a presser foot are adjusted; a guide frame and a reset spring are arranged on the upper portion of a presser rod, and the reset spring exerts pressure downwards to keep the presser foot to be free of vertical jumps. The automatic variable presser foot mechanism of the sewing machine is capable of automatically adjusting the height of the presser foot, simple in structure and convenient to adjust.

Description

technical field [0001] The invention relates to an automatic presser foot changing mechanism of a sewing machine, which belongs to the technical field of sewing machines. Background technique [0002] With the improvement of the sewing industry level, ordinary industrial sewing machines cannot meet the needs of the current market, and the quality of sewing products cannot meet the satisfaction of customers. The stitches obviously affect the aesthetics of customers. Under normal circumstances, the height of the presser foot of ordinary sewing machines is fixed, which cannot press the cloth well, resulting in bad sewing effects such as broken threads, floating threads, and skipped stitches. [0003] There are also more advanced industrial sewing machines that can adjust the height of the presser foot, or use manual adjustment to adjust the height of the intermediate presser foot, which is very inconvenient; or the structure is very complicated, the control is also very complic...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in the existing sewing machine, when adjusting the height of the presser foot, it is very inconvenient to adjust the height of the presser foot manually, or the structure is very complicated, and the control is also very complicated, resulting in high cost and low adjustment effect. bad

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