Failure Causes of overlock sewing machine and the Countermeasures(VI)

A wrinkle of slip sewing material sewn by an overlock sewing machine 

1. Feeding deficit ratio is too small; Move the differential wrench downward until the joint material is flat;

2. The bottom surface of the presser foot is uneven with the plane of the feeding tooth; Adjust according to technical requirements;

3. Control line pressure is too strong; Readjust the wire control strength;

4. The pressure of the holding device is too strong or too weak; Adjust the pressure strength of the fixture;

5. The feeding dog is too protruding from the needle plate; Adjust its correct height;

6. The cutter cannot cut quickly, Sharpen the blade or replace it with a new one, and check the coordination of upper and lower blades;

7. Differential feeding is not matched; Adjust proper differential feeding;

8. The needle is too thick; Choose suitable thread and needle;

9. The edging width is narrower than the needle plate tongue; Adjust the edging width or change the needle plate tongue;

The overlock sewing machine sews elastic sewing material to produce expansion 

1. The surplus ratio of feeding dog is too small, resulting in elongation; Move the differential wrench upward to the "0" position until the seam is flat;

2. The surplus ratio of feeding dog is too large, resulting in shortening; Move the differential plate hand to the "0" position;

The upper and lower seam materials are uneven and the lower seam is short 

1. The presser foot pressure is too loose; Increase the pressure of the pressure regulating screw;

2. Presser foot resistance is too large or uneven; Polish the front of the presser foot or install a flat presser foot;

3. The differential tooth is not on the same plane as the feeding tooth surface; Adjust the height of the feeding teeth as required to make the two tooth surfaces flush;

Irregular edge cutting of overlock sewing machine

1. The upper and lower blades are blunt; Grind the edges of the upper and lower blades with a diamond grinding wheel or black silicon carbide grinding wheel, and then grind the blade plane with grinding paste until it is sharp;

2. Poor contact and improper position of the cutter; Adjust as required;

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