Abstract: A orientation device including two turrets, carrying a plurality of punch-die pairs, are rotatable to carry a punch-die pair to a work station and, simultaneously, another punch-die pair to a changeover station. A magazine of punch-die pairs comprises at least one pair of discs joined to each other and carrying a series of punch-die pairs. The discs are selectively rotated to take a predetermined new punch-die pair to a collection station. At least one exchange arm is rotated by a corresponding servomotor and carries at least one gripper element, axially and radially moveable with respect to the arm, independently of each other.

Abstract: The machine includes two turrets carrying a plurality of punch-die pairs, a magazine for these pairs, and a device for changing over the pairs. This device is formed from at least one changeover arm having two gripper elements, each comprising a pair of jaws operable by a common actuator. The two jaws are provided with a through-pin and are each engagable in a pair of channels, perpendicular to each other, carried by a flange of the punch or the die. When the gripper element moves parallel to the axis of the punch or the die, a first channel of the pair is disposed axially and has a quadrangular section, while the other channel is tangential and has a triangular section.

Abstract: The machine comprises a work surface on which sheet metal rests, a fixed structure which supports the work surface, a work station provided with a hammer movable along a vertical axis to punch the sheet metal, punch units defined by a first holder and a punch tool, and die units defined by a second holder and a die tool. The machine includes a first rotatable table which carries the punch units and which transfers a punch unit to the work station, and a second rotatable table which carries the die units and which transfers a die unit to the work station. It includes a first structure for centering the punch unit with respect to the axis by securing the first holder to the fixed structure and means for centering the die unit with respect to the axis by securing the second holder to the fixed structure, excluding the tables from this securing which are therefore not affected by the mechanical stresses generated during punching, which are transmitted by the centering structure directly to the fixed structure.

Abstract: A machine for punching sheet metal includes a counterpunch holder unit including a supporting disk mounted for rotation about a main axis and supporting a number of counterpunch holder assemblies, each including a respective counterpunch. Each counterpunch holder assembly includes a main body secured to the supporting disk. Each main body includes a seat, which extends coaxially with the main body axis which is parallel to the main axis. Each counterpunch holder assembly further includes an extracting body housed in an axially-movable manner inside the seat to support the bottom of the respective counterpunch. A positive actuating assembly moves the extracting body axially to extract the counterpunch from the respective seat.

Abstract: A drive device, for rotating a machine tool table, includes an armature, of a linear electric motor, located tangentially along the whole lateral surface of a circular table. The armature is connected by its own lateral surface to the table. An inductor, of the linear electric motor, is located substantially facing at least a part of the armature.

Abstract: The machine includes: a worktable on to which a metal sheet is loaded in use; a work station; a member for feeding the sheet along the worktable to and from the work station, the member including a carriage movable along a first horizontal axis, a slide fitted to and movable with respect to the carriage along a second horizontal axis perpendicular to the first axis, and a number of gripper assemblies fitted to the slide and each having a gripper for engaging a peripheral edge of the sheet; and a device for clamping and releasing the gripper assemblies to and from the slide. The machine also includes a positioning device fitted to the slide, and for moving the gripper assembly, with respect to the slide, along an axis parallel to the second axis, to position the gripper assembly as required with respect to the slide; the positioning device including drive means for driving the gripper assembly to be positioned, and a device for transmitting motion from the drive means to the gripper assembly to be positioned.

Abstract: A machine for machining sheet metal and presenting:a multiple-tool assembly fitted with a number of tools arranged in a ring about a vertical axis;a multiple-die assembly fitted with a number of dies arranged in a ring about a vertical axis;a work station presenting a hammer movable along a vertical axis; anda carriage for moving the sheet.The main characteristic of the present invention is that the work station presents a strikerfor transmitting to the work tool the pressure exerted by the hammer; and a device for rotating the work tool about is longitudinal axis.

Abstract: A machine tool for working sheet metal is described. The principal characteristic of the present invention lies in the fact that it comprises electronic apparatus operable to control the adjustment of the stroke of a striker which can strike a pin supporting a tool for punching or nibbling a metal sheet.