The main function of the book stapler in book binding is to complete the process of folding the front cover of the book. Specifically, the curling machine is capable of cutting book cores, creasing the cover, and completing folding, thereby causing the cover to fold inward along the front edge of the book core. Legging machines are commonly used in the production of paperback books. Through these processes, the cover of the book is made more beautiful, and the slot can also be used to place information such as book introductions and author photos, increasing the added value of the book.