Patent ID: 7373707

Claim:
A milling apparatus ( 10 ) incorporated in an adhesive book binding system ( 1 ) which executes a series of adhesive book binding processes while conveying a sheet bundle ( 16 ), and arranged underneath the conveying path of said sheet bundle ( 16 ) for cutting a spine ( 16 a ) of said sheet bundle ( 16 ), said milling apparatus ( 10 ) having: a drive apparatus ( 23 ) having a rotational drive shaft ( 23 a ) extending upwardly; and a disc-shaped milling cutter ( 20 ) concentrically connected to a top end of said rotational drive shaft ( 23 a ) and arranged in a plane perpendicular to said rotational drive shaft ( 23 a ), said milling cutter ( 20 ) being provided with a large number of trimming blades ( 20 b ) arranged along one circumference and protruding upwardly for trimming said spine ( 16 a ) of said sheet bundle ( 16 ), said milling apparatus characterized in that said milling cutter ( 20 ) has at least one first groove cutting blade ( 22 b ) or at least one second groove cutting blade ( 21 b ) selectively attached to an inner side or an outer side in a radial direction with respect to a row of said trimming blades ( 20 b ); said first groove cutting blade ( 22 b ) upwardly extending over said trimming blades ( 20 b ) and forming shallow grooves ( 16 c ) on said spine ( 16 a ) of said sheet bundle ( 16 ); said second groove cutting blade ( 21 b ) upwardly extending over said first groove cutting blade ( 22 b ), and forming deep grooves ( 16 b ) on said spine ( 16 a ) of said sheet bundle ( 16 ); and that said milling apparatus ( 10 ) further comprises a mechanism for tilting said drive apparatus ( 24 ) in such a manner that said drive apparatus ( 23 ) is arranged at a first position when said milling cutter ( 20 ) has said second groove cutting blade ( 21 b ), and that said drive apparatus ( 23 ) is arranged at a second position when said milling cutter ( 20 ) has said first groove cutting blade ( 22 b ), said rotational drive shaft ( 23 a ) being positioned approximately orthogonal to said spine ( 16 a ) of said sheet bundle ( 16 ) at said first position, said rotational drive shaft ( 23 a ) being tilted at a predetermined angle to said spine ( 16 a ) of said sheet bundle ( 16 ) at said second position.