1. Before using the new sewing machine, loosen the position screw of the feed dog. The height of the feed dog is determined by the thickness of the fabric. At this time, the position of the feed dog is relatively matched with the position of other parts, indicating that the height of the feed dog is more appropriate ( To be within the range specified by the standard of the machine), just fix the screw in its position.
2. If the fabric is wrinkled or stagnant during use, consider that the feed dog is too low and the pressure on the upper presser foot is too high. Therefore, the fixing screw of the feed dog can be loosened. , Raise the feed dog a little bit, and then tighten the fastening screw in its position.
3. If the fabric goes back and forth during use, consider the position of the feed dog is too high and the pressure on the upper presser foot is too small. Therefore, the fixing screw of the feed dog can be loosened. Lower the feed dog a bit, and then tighten the fastening screw in its position.
4. If the fabric is slanting irregularly during use, you can consider that the screws that fix the position of the feeding dog are loose, or the reason is caused by the skew of the feeding dog. Therefore, the feeding dog can be changed. Loosen the fixing screw, correct the feed dog to the correct position, and then fix the fixing screw in its position.
5. To understand the transmission mechanism of the feed dog, the cooperation between the feed dog and the needle is actually the feed dog driven by the swing shaft Dalian rod. Sometimes the problem is that the overall synchronization movement is deviated. Therefore, it is necessary to eliminate After the above reasons, the position of the Dalian lever can be adjusted to make the feed dog move synchronously with the needle.
6. Before adjusting the synchronous movement relationship between the feed dog and the needle, first disengage the pendulum part, adjust the height of the movement track of the feed dog and the needle, and then fix the position of the feed dog and the needle. At the same time, it is also required that the gap between the left and right sides of the feed dog in the needle plate groove is equal.
