Common fault of Button sewing machine: broken thread

Jul 14, 2022

Generally, there are fewer failures of the button sewing machine than other sewing equipment, it is easier to analyze the causes if there are failures. For some machine transmission faults, they can be eliminated according to the mechanism principle, positioning standard and adjustment method. The following is a discussion of the faults caused by the frequent use of the machine.

Broken thread is one of the most common faults of button sewing machine. There are many reasons for the fault, its symptoms are also different. The causes and troubleshooting of common broken wire faults are shown in table 8-3 and table 8-4.

Table 8-3GJ4 machine broken fault causes and troubleshooting

Faults

Methods of Resolution

1. The thread is of poor quality and has no tension

1. Replace high-quality thread

2. The needle hole or slot of the machine needle is not smooth

2. Replace the needle with a new one

3. The button hole is small, and the machine needle is too thick

3. Replace the fine needle

4. The position of the button clip is not correct, and the machine needle is nailed on the button

4. Adjust the position of the button clamp mounting bracket

5. The square hole plate is misaligned, and the machine needle wipes the square hole

5. Adjust the position of the square hole so that the needle is in the middle of the square hole

6. Needle baffle contact

6. Adjust the gap between the needle baffle and the needle ≤ 0.1mm

7. The middle clamp is too tight or the first clamp is opened too late (cross line break)

7. Adjust the pressure of the middle clamp and the opening time of the first clamp

8. The line at the transmission pole is bent

8. Increase the take-up amount and adjust the transmission rod

9. There are rust spots or burrs on the wire hook

9. Polish with fine sand or replace with new wire hook

10. There are burrs in the needle baffle or needle plate hole

10. Polish and deburr with fine sand

11. The swing width of needle bar is improper

11. Adjust the swing width of the needle bar according to the standard

12. When the thread hook hooks the thread, wipe the needle, causing the thread hook to hook on the outside of the needle

12. If the needle hole of the needle bar is eccentric or not straight, replace the needle bar

button sewing machine

Table 8-4 causes and troubleshooting of thread breakage of 373 and 372 button sewing machine

1. Incorrect threading

1. Thread according to the specified line

2. There are burrs where the wire passes

2. Sanding with fine emery cloth

3. The pressure of the second wire clamp is too high

3. Loosen the pressure regulating nut properly

4. The pressure of the first wire clamp is too high

4. Properly loosen the pressure regulating nut (standard pressure 7-5g)

5. The second thread gripper floats too late

5. Slightly adjust the floating timing of the thread clamp to the front

6. The position of thread clamping frame is incorrect

6. Adjust the position of wire clamping frame

7. The needle does not fall to the center of the buttonhole

7. Adjust with button holder

8. The thread pulling board moves slowly

8. Adjust the position of the thread pulling board

9. The needle collides with the thread hook machine

9. Adjust the gap between the needle and the thread hook to 0.05-0.1mm

10. Compared with the size of the buttonhole, the machine needle is too fine

10. Replace with a thinner needle

11. There are burrs or sharp edges on the hook

11. Polish with fine emery cloth

12. The stroke of the thread management adjusting hook is too small

12. Adjust the stroke to 8-12mm

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