Problems and Solutions of Shoe Upper Sewing Process

What are the causes and solutions for accidental needle skipping during the sewing process of the shoe factory?

Reason 1: The needle tip is hairy, the needle is bent, the needle groove is not smooth or improperly selected. Troubleshooting method: Replace the appropriate new needle.

Reason 2: The needle is installed crookedly, and the distance between the needle and the rotary shuttle is inappropriate. Troubleshooting method: Adjust the distance between the needle and the rotary shuttle tip to be within the standard range.

Reason 3: The thickness and twist of the suture are uneven, which affects the formation of the thread loop. Troubleshooting method: Select good quality sewing thread according to the standard.

Reason 4: The height position of the needle bar is incorrect. Troubleshooting method: Adjust the height of the needle bar.

Reason 5: The rotary shuttle mouth is worn. Troubleshooting method: Grinding and polishing.

Reason 6: The pressure of the presser foot is too small, the suture shakes, and the thread cannot be pressed, which affects the loop formation. Troubleshooting method: Increase the pressure of the presser foot.

Reason 7: The presser foot groove is too wide. When the needle pierces the cloth and withdraws, the fabric rises, affecting the formation of the thread loop. This situation has the greatest impact when sewing thin materials. Troubleshooting method: Move the presser foot to the left or right according to the fabric, or fill the wide groove with solder.

Reason 8: The thread pick-up spring is too low, and the fabric, needle and thread are not matched properly. Troubleshooting method: Adjust the thread pick-up spring appropriately.

Reason 9: The needle plate hole is too large. When sewing thin fabrics, the fabric drops together with the needle, delaying the formation of the thread loop. Troubleshooting method: Replace the new needle plate.

Reason 10: The positioning of the rotary hook is not standard, and the distance between the hook tip and the needle is too far. Troubleshooting method: Adjust appropriately according to the standard.

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