Repair method of needle jump and broken wire of electric sewing machine

Needle jumping and thread breaking are two common situations in the process of electric sewing. Analyze the possible reasons first, and then solve the corresponding reasons.

The following are the common causes and solutions of needle jumping and thread breaking.

First, about jumping needles:

1, backlash, height, position and direction error between needle and shuttle (check with the standards in the Maintenance Master Safety Manual). )

2. Needle bending (needle replacement)

3. The thickness of the needle does not match the sewing material (choose the appropriate needle for the thin cloth of small size 9- 14, and choose the appropriate needle for the thick cloth of large size 14- 18).

4. The bottom thread tension and presser foot pressure are too weak (increase the bottom thread tension and presser foot pressure).

5, the needle is short, the model is wrong (choose the right needle)

Second, about disconnection:

1, the thread will be broken if it is not adjusted well (the best way to adjust the thread is to adjust the thread first, put the core in the bobbin case and then adjust the thread, so it is advisable to hold the thread in one hand, and the bobbin case will be pulled down slowly, and then adjust the top thread according to the thread).

2. When the gap between the shuttle bed and the needle tip is too large, the thread will be broken (when adjusting the shuttle bed, the distance between the hook and the needle groove should be 0. 1mm, if it is less than 0. 1mm, the needle will be easily broken. )

3. Improper adjustment of the presser foot will be bad (there is friction between the presser foot and the needle when adjusting the presser foot, so shake the presser foot left and right by hand to see if it will touch the needle).

If the cloth is too thin, it will break. (When sewing, press your feet out of the cloth and break the thread)

5. If the cloth is too thick, it will break (tighten the screw at the top of the presser foot to make it have a certain pressure).

6. The needle bar and the shuttle bed will break if they are not synchronized (when adjusting the needle bar, put the shuttle sleeve on the needle plate, and then adjust the shuttle bed when the needle bar is just adjusted to the height of one shuttle sleeve).

7. The needle hole of lathe needle will be broken if it is too sharp (round needle is recommended, the price is slightly higher).

Extended data:

Matters needing attention of electric sewing machine

1, the power button and pedal cannot be used at the same time;

2. The rectifier and dry battery cannot be used at the same time, which will damage the machine;

3. If the positive and negative poles of the battery are wrong, the machine will be reversed, and sewing will not be possible if the machine is reversed;

4. Reversing the machine continuously for a long time will damage the machine;

5. The machine can't use fine and thick fabrics;

6. Please use four 6V 1.0A or No.5 batteries for the rectifier.

Baidu encyclopedia-electric sewing machine