Auxiliary pulling mechanism of a sewing machine

Abstract

The invention relates to the technical field of sewing machines, in particular to an auxiliary pulling mechanism of a sewing machine, which includes a processor and an auxiliary presser foot assembly;the auxiliary presser foot assembly includes an auxiliary presser bar hinged to a lift presser foot of the presser foot assembly, a driving device connected to the auxiliary presser bar and a sensorused for detecting the thickness of cloth; the processor is connected to the sensor and the driving device; the sensor sends the measured cloth thickness information to the processor, whereby the processor controls the driving device to control the pressure exerted by the auxiliary presser bar on the lift presser foot. When the sensor detects that the lift presser foot begins to rise, the sensor sends the measured cloth thickness information to the processor and the processor controls the driving device accordingly to increase the pressure exerted by the auxiliary presser bar on the lift presser foot, so that the cloth is not deformed due to insufficient vertical downward pressure, a folded part of the cloth can smoothly pass between the a press wheel and a needle cushion, and smooth sewing and uniform stitching and beautiful stitches are guaranteed.

Description

technical field [0001] The invention relates to the technical field of sewing machines, in particular to an auxiliary pulling mechanism of the sewing machine. Background technique [0002] The sewing machine is an elbow-shaped cylinder type, which is used for lap sewing of men's clothing, women's clothing, casual clothing, denim clothing, shirts, overalls, raincoats, etc. [0003] When the existing sewing machine sews folded cloth, the surface of the cloth is not smooth due to the folding, that is, the folded part is higher than other parts of the cloth. During the sewing process, when the cloth enters the presser foot of the sewing machine When it is between the needle pad and the needle pad, since the presser foot is under the constant downward pressure of the presser foot assembly during the whole sewing process, and because the presser foot is in the whole climbing process (climbing from the flat part of the fabric) to the folded part of the fabric), its vertical downwa...

AI Technical Summary

Problems solved by technology

[0003] When the existing sewing machine sews folded cloth, the surface of the cloth is not smooth due to the folding, that is, the folded part is higher than other parts of the cloth. During the sewing process, when the cloth enters the presser foot of the sewing machine When it is between the needle pad and the needle pad, since the presser foot is under the constant downward pressure of the presser foot assembly during the whole sewing process, and because the presser foot is in the whole climbing process (climbing from the flat part of the fabric) to the folded part of the fabric), its vertical downward component force will become smaller, so when passing through the folded part, the pressure of the presser foot on the fabric is insufficient, because the fabric is a soft material, which can cause the fabric to deform, such as Stretching or wrinkling, which will also cause this part of the fabric to pass between the pressure roller and the needle pad is not smooth, resulting in uneven sewing stitches or deviations in the stitches

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