Anti-coiling mechanism of sewing machine

Abstract

The invention discloses an anti-coiling mechanism of a sewing machine. The mechanism comprises a needle rod connecting rod and a thread take-up lever which are arranged on a left rotation shaft and a right rotation shaft at the left end and the right end of a crank, wherein the crank comprises a round disc, a left rotation shaft and a right rotation shaft; the left rotation shaft and the right rotation shaft are eccentrically arranged on the round disc; the needle rod connecting rod and the thread take-up lever are sleeved on the left rotation shaft and the right rotation shaft through a bearing respectively; a sheath extending rightwards is arranged along the outer peripheral face of the right end face of the round disc; an arc convex block extending leftwards is arranged along the outerperipheral face of the left end face of the round disc; an arc through groove is formed along the peripheral direction of the disc on the convex block; and a rightwards convex blade is arranged on the needle rod connecting rod. When the crank rotates one circle, the blade passes through the arc through groove. When broken threads are wound on the outer peripheral face of the crank, along with therotation of the crank, the blade passes through the arc through groove on the crank and cuts off the broken threads wound on the outer peripheral face of the crank, so that the phenomenon that the broken threads are wound in a clearance between the left end face of the round disc and the right end face of the needle rod connecting rod is avoided.

Description

technical field [0001] The invention relates to a sewing machine, in particular to a sewing machine anti-winding mechanism. Background technique [0002] figure 1 It shows a schematic diagram of the installation of the sewing thread in the sewing machine, the existing sewing machine needle bar transmission mechanism such as figure 2 shown, refer to figure 1 and figure 2 , when the existing sewing machine is sewing materials, the phenomenon of sewing thread breakage occurs from time to time, because the sewing machine is still rotating at high speed after the thread breakage, so the thread take-up lever 6 on the sewing machine will bring the broken sewing thread up and down at high speed movement, so it is easy to wind the sewing thread around the rotation axis of the thread take-up lever ( figure 2 In A), the thread take-up lever is stuck, resulting in damage to the thread take-up lever, and in severe cases, the needle bar rotating mechanism of the entire sewing machi...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to solve the problem that after the sewing machine breaks, the sewing thread ends are easily entangled on the rotating shaft of the thread take-up lever

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