Abstract: A lower metallic die has a major surface for supporting a workpiece thereon. A ridgeline is formed on an end portion of the major surface and with which a bending portion of the workpiece is brought into contact. An upper metallic die has a plane surface rotatable in a bending direction of the workpiece to clamp the workpiece together with the ridgeline of the lower metallic die, thereby freely bending the workpiece at one angle of desired various angles. A rotation controller controls rotation of the plane surface of the upper metallic die, thereby rotating and positioning the plane surface at a position of the one angle of the desired various angles.

Abstract: A lower metallic die has a major surface for supporting a workpiece thereon. A ridgeline is formed on an end portion of the major surface and with which a bending portion of the workpiece is brought into contact. An upper metallic die has a plane surface rotatable in a bending direction of the workpiece to clamp the workpiece together with the ridgeline of the lower metallic die, thereby freely bending workpiece at one angle of desired various angles. A rotation controller controls rotation of the plane surface of the upper metallic die, thereby rotating and positioning the plane surface at a position of the one angle of the desired various angles.

Abstract: A turret punch press machine comprising a frame consisting of a base frame portion, column portions extending from the base frame portion, and an upper frame portion horizontally extending from the column portions. The upper frame portion is divided into first and second upper frame portions, a hammer and a hammer driving mechanism are attached to the first upper frame portion. An upper turret of paired ones, each having plural die halves at the circumferential rim portion thereof, is attached to the second upper frame portion, whereas another lower turret is attached to the base frame portion. Even when the first upper frame portion is deformed by the repulsive force and the like of the hammer which is being operated, the second upper frame portion is left undeformed so that the upper and lower turrets cannot have an undesired positional relationship.

Abstract: A punch press having a punch holder and a die holder rotatably mounted on vertically spaced upper and lower plates, respectively. A punch and the corresponding die are held in the punch and die holders, respectively, for rotation therewith. The punch is cooperable with the die to machine the workpiece positioned therebetween when a predetermined angular attitude of the punch relative to the die is maintained. A detector is provided for checking whether the predetermined relation in angular attitude between the punch and the die is maintained when they are in their home positions and when they are angularly displaced from their home positions. Preferably, the upper and lower plates are arranged into upper and lower turrets rotatably holding a plurality of circumferentially spaced punch and die holders, respectively.