Patent ID: 8245610

Claim:
A device for cutting bar-shaped or tubular workpieces ( 1 , 27 ), comprising a) a driven toolholder ( 3 , 25 ) which is provided with a passage ( 5 ) for the workpiece ( 1 , 27 ) to be machined and is mounted rotatably about the longitudinal axis of the workpiece ( 1 , 27 ) to be machined, with a plurality of tools ( 7 , 26 ) advanceable essentially in the radial direction, b) a driven advancing sleeve ( 4 , 24 ) rotatably mounted concentrically to the toolholder ( 3 , 25 ), c) relative movement means for generating a relative movement between the toolholder ( 3 , 25 ) and advancing sleeve ( 4 , 24 ), said relative movement means comprising a gear and aa) a sleeve driving gearwheel ( 19 ) for engaging a toothed rim ( 15 ) of the advancing sleeve ( 4 , 24 ) and arranged on a gear shaft ( 17 ), with a first helical toothing, bb) a holder driving gearwheel ( 18 ) for engaging a toothed rim ( 14 ) of the toolholder ( 3 , 25 ) and arranged on the same gear shaft ( 17 ), with a second helical toothing oriented opposite to the first helical toothing, and cc) means ( 21 ) for controlling axial displacement of the gear shaft ( 17 ) in relation to the advancing sleeve ( 4 , 24 ) and/or to the toolholder ( 3 , 25 ), and d) advancing means for converting the relative movement between the toolholder ( 3 , 25 ) and advancing sleeve ( 4 , 24 ) into an advancing movement of the tools ( 7 , 26 ), wherein aaa) the advancing means for each tool ( 7 , 26 ) comprises a tool guide ( 11 , 31 ) provided on the advancing sleeve ( 4 , 24 ), each tool guide ( 11 , 31 ) being arranged to run in the circumferential direction at a decreasing distance from the advancing sleeve axis of rotation bbb) the relative movement between the toolholder ( 3 , 25 ) and advancing sleeve ( 4 , 24 ) is a relative rotation concentric to the axis of rotation of the toolholder ( 3 , 25 ), and ccc) each tool ( 7 , 26 ) bears directly or via a tool carrier ( 6 ) against the associated tool guide ( 11 , 31 ).