method for the production of hardcovers at three bridges, for the binding of books and machine for implementing such a method

摘要

In order to form a hard book binding having a middle covering and two side coverings, a unitary covering is first formed by securing the side coverings onto the middle covering; thereafter, a spine member and two coverboard members are attached, in mutually spaced apart relationship, to said unitary covering at the middle covering and the side coverings, respectively.