No.1 pushes the movable type loading and unloading handles inward, and at the same time, the handlebar turns 90 off the hook and pulls out the movable type module. No.2 is shown by the triangular arrow in the figure. When the curved handle is up, the word slot will be locked, and the word slot cannot be removed. No.3 is shown by the triangular arrow in the figure. At this time, the handle is bent downward, and the handle can be pulled out to remove the word slot.