Solutions to Problems such as Poor Stitches in Interlock Sewing Machines

seam wrinkle

1. The differential feeding ratio is improper, adjust the differential feeding ratio appropriately

2. The height of the feed dog, the position of the front and rear is not appropriate, and the height of the feed dog and the position of the front and rear are readjusted according to the standard.

3. The suture tension is too large, adjust the suture tension appropriately

4. The pressure of the presser foot is too large or too small, adjust the pressure of the presser foot appropriately

5. The small presser foot loses its up and down flexible movement, the suture is embedded between the large and small presser feet or rusted, foreign objects between the large and small presser feet, rust and rust removal or replacement of the rusted presser foot

Poor stitching

1. The thickness of the thread is different, use a better suture instead

2. The thread tensioner does not work properly, and there is dust in the thread tensioner, so that the thread is passed smoothly.

3. The positioning of the thread guide is incorrect, adjust the tension of the needle thread, looper thread and needle thread

4. The wire hole is not smooth, grind or polish the wire hole

Needle hole

1. The needle point of the straight needle is blunt or hairy, replace the needle

2. Compared with the sewing material, the needle is too thick, so use a thicker needle

3. The needle plate eye is too small or has a corner, round the needle plate eye