Fixture for drilling sheets of fragile material, in particular, sheets of glass

Abstract

A fixture for drilling sheets of fragile material is connectable to a movable machining head having a supporting structure and a rotary member, and includes a supporting frame, a shank for connecting the supporting frame to the supporting structure, and a first and at least a second powered spindle for a first and, respectively, a second drilling tool and extending in opposite directions with respect to the supporting frame; the spindles being rotated about respective axes parallel to each other by a transmission, an input member of which is connected to the rotary member of the machining head.

1 ) A fixture ( 7 ) for drilling sheets ( 2 ) of fragile material, in particular sheets of glass, and which is connectable to a movable machining head ( 1 ) comprising a supporting structure ( 3 ) and a powered rotary member ( 4 ); the fixture ( 7 ) being characterized by comprising a supporting frame ( 10 ); connecting means ( 12 ) for connecting the supporting frame ( 10 ) to the supporting structure ( 3 ) of the machining head ( 1 ); a first ( 18 ) and at least a second ( 19 ) spindle for a first ( 18   a ) and a second ( 19   a ) drilling tool respectively, said spindles ( 18 )( 19 ) being connected to said supporting frame ( 10 ) to rotate about respective axes ( 20 ) parallel to each other, and being oriented in opposite directions with respect to the supporting frame ( 10 ), so that the cutting edges of the tools ( 18   a )( 19   a ) are located on opposite sides of the supporting frame ( 10 ); and motion transmission means ( 22 ) comprising an input member ( 23 ) connectable to said rotary member ( 4 ), and which transmit motion to both said first ( 18 ) and said second ( 19 ) spindle.  
     
     
         2 ) A fixture as claimed in  claim 1 , characterized in that the axes ( 20 ) of rotation of said spindles ( 18 )( 19 ) are spaced transversely apart.  
     
     
         3 ) A fixture as claimed in  claim 1 , characterized in that the axes ( 20 ) of rotation of said spindles ( 18 )( 19 ) extend parallel to the axis ( 5 ) of rotation of said rotary member ( 4 ).  
     
     
         4 ) A fixture as claimed in  claim 3 , characterized in that the axis ( 20 ) of rotation of one ( 18 ) of said spindles ( 18 )( 19 ) coincides with the axis ( 5 ) of rotation of said rotary member ( 4 ).  
     
     
         5 ) A fixture as claimed in  claim 1 , characterized in that said first ( 18 ) and said second ( 19 ) spindle are located a fixed distance (D) apart.  
     
     
         6 ) A fixture as claimed in  claim 1 , characterized by comprising adjusting means ( 25 ) for adjusting the distance (D) between said two spindles ( 18 )( 19 ).  
     
     
         7 ) A fixture as claimed in  claim 6 , characterized in that said adjusting means ( 25 ) are discrete adjusting means.  
     
     
         8 ) A fixture as claimed in  claim 6 , characterized in that said adjusting means ( 25 ) are continuous adjusting means.  
     
     
         9 ) A fixture as claimed in  claim 6 , characterized in that said supporting frame ( 10 ) comprises a first ( 15 ) and a second ( 16 ) end portion, each fitted with a respective said spindle ( 18 )( 19 ); said adjusting means ( 25 ) comprising at least a guide-slide coupling interposed between said end portions ( 15 )( 16 ).  
     
     
         10 ) A fixture as claimed in  claim 1 , characterized in that said supporting frame ( 10 ) comprises a cavity housing at least said transmission means ( 22 ).