Analysis of the use of the thread take-up spring in the sewing machine

The thread take-up spring has always been in a very inconspicuous position in the sewing machine. It is always in the thread gripper, and always cooperates with the thread take-up lever. The process comes into play in order to get every good stitch.

The function of the thread take-up spring is to absorb and store the thread supply of the thread take-up lever and the surplus thread required by the rotary hook, so as to ensure that the suture can enter the sewing material through the needle hole stably and smoothly from the rotary hook and the rotary hook. The shuttle positioning hook is released, and the needle thread is quickly tightened with the thread take-up lever.

When the thread take-up lever is lowered (the rotation angle of the main shaft is 80 degrees, the same below), the suture is only supplied for the needle to descend and enter the sewing material.

Therefore, a large amount of suture lies in the slack and free beating of the front of the machine head. At this time, part of the excess suture can be stored through the rise of the hook to stabilize the suture, so that the suture can be stored through the rise of the hook. It plays the role of stabilizing the suture, so that the suture is regularly transported to the bottom of the sewing material through the needle groove. When the tip of the rotary hook enters the straight needle thread loop, the stitching thread in the rotary hook is continuously expanded. During the process of interweaving with the bottom thread, the amount of thread required increases sharply. There is a thread take-up spring for the insufficient part to replenish the stored cash in time. When overrunning the hook by 1/2, the amount of thread used is a good value. After that, the thread take-up lever rises, and a large amount of sewing thread is stably slipped and pulled out from the hook, positioning hook and needle plate hole.

When the thread take-up lever will reach the point, the thread take-up spring is pulled up, releasing the stored stitches, and in cooperation with the feeding mechanism, the stitches of the previous stitch are tightened and the current required for the next stitch is lifted from the bobbin. quantity.