1. Pull out the fixing sleeve of the printing wheel head and the printing wheel assembly.

　　2. Remove the zinc alloy letter fixing plate, replace the zinc alloy letter, and then insert the fixing plate into the fixed letter.

　　3. Put the printing wheel back onto the axis, rotate it left and right to fit the fixing bolt hole of the printing wheel head into the fixing bolt, and then put the printing wheel fixing sleeve on it.

　　4. The fixed baffle should be clamped on both sides of each character.

　　The method of changing the ribbon of the ribbon coding machine

　　Pull out the movable organic board on the folding wheel and install it in the direction of the arrow shown in the picture. Pay attention to adjusting the adjusting screws on the folding and retracting pulleys to ensure that the paper tube of the ribbon does not slide between the folding and retracting pulleys.