What about the needle jump of the old household sewing machine?

1. First, check whether the lower needle is installed correctly, and it is best to replace it with a new needle.

2. If it still doesn't work, let's open the needle board, turn the needle to the lowest position and see that the tip of the shuttle is about 8mm away from the needle. If so, lift the needle about 2.3 mm, and then see if the tip of the shuttle coincides with the center of the needle. At this time, the needle should not be too close to the shuttle tip, and there should be a gap of 0. 1.

Sometimes the needle will jump if it bends a little. The easiest way is to try changing the needle. If it doesn't work, try to put it down a little, just a little, or it will break. Sometimes this simple operation is also very effective.

The thickness of what you sew is also related to the needle. Thick things need thick needles. If the needles are thin, they will jump. Thin things will jump if they are thick.

5. Because the machine needs maintenance, clean the toothed plate on the machine and the place where the shuttle is placed below, and then oil it.