The bottom line of the sewing machine is knotted into a ball is a common fault of the sewing machine, and the following is a detailed explanation of how to solve the bottom line mess.
First of all, it may be that the upper crimping board does not press the line, and the line will run to the bottom with the needle to form a clump.
How to deal with the mess on the bottom line of the sewing machine:
First of all, check whether the winding is correct. Secondly, check whether the timing of the feeding teeth and the needle is correct, there are two principles, one is three flat, that is, the needle, the needle plate, and the feeding teeth are on the same plane, and the needle is slightly higher by one millimeter, and the other is when the needle begins to fall, the feeding teeth begin to send the cloth backwards, and there will be no floating line problem if the two conditions are met.
The bottom line is a ball is caused by the bottom line is too loose, clean up the bottom line, put in the bobbin skin, there is a screw in the place where the thread is clamped on the bobbin skin of the sewing machine, turn the screw with a screwdriver to adjust the tightness of the bottom line of the sewing machine, clockwise is tight, when adjusting the bottom line with pulling outward, feel the size of the resistance, according to the thickness of the sewing thing to adjust, the thick resistance is smaller, the thin resistance is larger, the thread shuttle is installed on the machine, the bottom line is drawn, the presser foot is put down, the upper and lower lines are pulled by hand, and the resistance is equal, if not, then adjust the regulator on the line to make it equal, the line is loose out of the set, the thread is tightened and the sewing is wrinkled or even broken, after adjustmentIf the stitch stitches on the fabric on the fabric are loose or even have a thread sleeve, the upper line should be tightened, and the lower stitch stitches should be tightened to tighten the lower line, the above is a detailed introduction to the bottom line of the sewing machine's bottom line, for reference only!