Abstract: The present invention relates to the tool for working tubes. The tool includes a body having hinged thereto a trigger for moving back-and-fourth, and which is connected to a support member supporting a working head. A drive device is provided for driving the support member mounted on the body and connected to the trigger. The support member includes a toothed rack, and the drive device includes a first toothed gearwheel having a first module and meshing with the rack, a drive pawl serving to advance the rack forwards, and a retaining pawl preventing it from moving backwards. The drive device includes a second toothed gearwheel having a second module smaller than the first module, the second gear-wheel being secured to the first gearwheel, the drive pawl and the retaining pawl being engaged with the second gearwheel.

Abstract: A die cushion controlling apparatus for controlling an operation of a cushion pad, which comprises a pad drive mechanism for driving to raise or lower the cushion pad while applying an upward energizing force, a load measuring unit for measuring a load generated in the cushion pad, a time detecting unit for detecting a generating time and a vanishing time of the load, and a control unit for controlling the pad drive mechanism so that a load measured value measured by the load measuring unit follows a preset load pattern during a period from when the time detecting unit detects the generating time of the load until when the time detecting unit detects the vanishing time of the load.

Abstract: A cylinder is formed in the lower portion of a cushion pad, and a piston coupled to an upper end of a rod is slidably contained in the cylinder. The rod is coupled to a rotary shaft of a servomotor. An oil pressure chamber is formed of an inner wall surface of the cylinder and a wall surface of the piston. The axial center of the oil pressure chamber is identical with the axial center of the rod. The pressure oil for alleviating an impact is filled in the oil pressure chamber. The pressure oil filled in the oil pressure chamber absorbs a force operating instantaneously at the cushion pad. According to this structure, the impact generated in a press machine can be alleviated.

Abstract: A method for producing a workpiece in the form of a metal sheet with at least one at least partly rolled edge, said at least one edge to be rolled having a length in a longitudinal direction and a curvature in at least one portion along said longitudinal direction, comprises the steps of providing said workpiece, in said at least one portion which has said curvature, with at least one material projection extending in said longitudinal direction of said edge over a part of said length of said at least one edge to be rolled, so that said edge, along said material projection, projects beyond remaining portions of said edge adjoining said material projection transversely to said longitudinal direction of said edge, and subsequently rolling said edge including said material projection.