Device for cutting bar-shaped or tubular workpieces

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).