How to adjust the synchronous adjustment of the needle and the hook of the flat eye machine?

First determine the height of the needle bar, turn the needle bar to the lowest point, insert the gauge between the needle plate and the lower end of the needle bar, the needle bar touches the gauge, and then loosen the fixing screw of the needle bar cover to adjust the needle bar. Height; turn the hand wheel in the normal direction of rotation, let the needle rise from the lowest point, insert the gauge between the needle plate and the lower end of the needle bar, let the needle bar push the gauge, loosen the shaft sleeve fixing screw, Adjust the tip of the hook to the center of the needle, and the gap between the needle and the tip of the hook is about 0.05mm. The bite is adjusted to 0~0.2mm.