Patent ID: 7857558

Claim:
A tool head unit for the milling of a workpiece comprising: a support beam ( 8 ), which defines a longitudinal axis (Z), a pivot body ( 14 ) which is supported by the support beam ( 8 ) and which is pivotable about a first pivot axis (B) with respect to the support beam ( 8 ) by means of a first drive arrangement ( 37 ); a machine-tool spindle ( 11 ) which is supported on the pivot body ( 14 ) and which is pivotable about a second pivot axis (A) with respect to the pivot body ( 14 ) by means of a second drive arrangement ( 50 ); at least one of the pivot body ( 14 ) with respect to the support beam ( 8 ) and the machine tool spindle ( 11 ) with respect to the pivot body ( 14 ) has two curved guide arrangements ( 36 , 36 ′) effectively arranged therebetween, for pivotable support and guidance of the pivot body, or the machine tool spindle, respectively; wherein each of the two curved guide arrangements ( 36 , 36 ; 36 ′, 36 ′) includes a pivotally mounted circular arc segment guide track ( 32 , 32 ; 32 ′, 32 ′), and wherein said two circular arc segment guide tracks extend co-axially around the respective pivot axis (B, A) and parallel to each other in axially spaced relationship with respect to the respective pivot axis (B, A); and wherein each curved guide arrangement ( 36 , 36 ′) includes at least two guide carriages ( 34 , 34 ; 34 ′, 34 ′) in which the respective circular arc segment guide track is movably guided.