Sewing machine with adjustable needle rod and take-up stroke

Abstract

The invention relates to a sewing machine with an adjustable needle rod and a take-up stroke. The sewing machine comprises a machine body, a main shaft transmission mechanism, a take-up transmission mechanism, a crank and a needle rod transmission mechanism. The main shaft transmission mechanism comprises a rotary shaft and a bob-weight cam connected with the rotary shaft in a sleeved mode, wherein the rotary shaft is connected with the machine body in a penetrating mode. The take-up transmission mechanism comprises a balance arranged at one side of the bob-weight cam, an eccentric shaft located in a shaft hole and a swinging arm, wherein one end of the swinging arm is in pivot connection with the eccentric shaft, and the other end of the swinging arm is in pivot connection with the balance. One end of the crank penetrates through the balance and is fixed on the bob-weight cam. The needle rod transmission mechanism comprises an eccentric wheel, the needle rod connected with the machine body in a sliding mode and a connecting rod, wherein the eccentric wheel is connected with the other end of the crank in a positioning and sleeved mode, one end of the connecting rod is in pivot connection with the eccentric wheel, and the other end of the connecting rod is in connection with the needle rod. The sewing machine can be adjustably used according to stitching requirements of fabrics with different thicknesses.

Description

technical field [0001] The invention relates to a sewing machine, in particular to a sewing machine with adjustable needle bar and thread take-up stroke. Background technique [0002] The known sewing machine mainly includes a body, a main shaft mechanism, a thread take-up mechanism, a crankshaft and a needle bar mechanism. Inside the machine body, the thread take-up mechanism includes a scale arranged on the side of the counterweight cam, a rod body that is passed through and fixed in the shaft hole of the body, one end is pivotally connected to the rod body and the other end is pivotally connected to the body. connected to a swing arm of the balance; one end of the crankshaft passes through the balance and is fixed on the counterweight cam; The other end and a connecting rod of the needle bar. [0003] Yet known sewing machine can only be applicable to on the cloth sewing of single thickness or slight thickness change, when sewing for cloth of different thickness, becaus...

AI Technical Summary

Problems solved by technology

[0003] Yet known sewing machine can only be applicable to on the cloth sewing of single thickness or slight thickness change, when sewing for cloth of different thickness, because the moving stroke of needle bar and the moving stroke of take-up thread and sewing effect and machine The sewing performance is closely related, so the general garment manufacturers purchase other sewing machines of different specifications for use, which will greatly increase the purchase cost of equipment or machines; The larger workshop space provides the placement of various types of sewing machines, which leads to the continuous increase of the cost of the workshop

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