Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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punching machine

A machine used to produce holes in paper. It consists of a flat plate on which the pile to be punched is placed, an arm which carries the hollow punches, and lay guides to which the sheets are fed, so that the holes are punched in the same positions throughout. The punches, which are generally positioned about 1/8 to 1/4 inch from the back edge of the sheets, descend and punch the holes. The discs of waste paper produced are left in the hollow center of the punches and eventually clear through their open tops. The punching machine has been largely superseded by the paper drilling machine. (179 , 189 )

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