Is the three-sided cutter blade cut at the same time?

Before I understood the workflow of the three-sided cutting blade machine, I always thought that the three-sided cutting blades were cut at the same time. In fact, for the three-sided cutting blade, left/right knife cut first, then the front knife. The following is the workflow of the three-sided cutting machine:

The conveyor belt is automatically sent to the book to be cut or manually fed and positioned → the book is clamped and the book is sent to the cutting station and positioned → the book press is pressed → the knife is cut on both sides → the front knife is cut → the paper press is reset → Book out.