A tool storage device is disposed on a side of a press brake. In the tool storage device, a lower tool holder is lifted up from lower tool holder support members, is moved forward or backward, and both end sides in a left-and-right direction of the lower tool holder are lowered after being passed through recessed portions formed on the lower tool holder support members (step (a)). The lowered lower tool holder is conveyed forward, and is positioned to a same height as a height of a lower tool mounting portion in a lower table (step (b)). The lower tool held in the lower tool holder is transferred to the lower tool mounting portion by a tool replacement device, and is mounted on the lower table (step (c)). The lower tool mounted on the lower table is returned into the tool storage device (step (d)).

An apparatus meant to contain a die portion of a punch and die set whether in a loading cartridge or in machine operating position, wherein a key is used with a die shoe to prevent lateral movement of the die regardless of extent by which the die is sharpened and continued to be used with the die shoe, and wherein a die is used with the die shoe to minimize jagged or sharp edges being created from sharpening processes thereof.

An apparatus meant to contain a die portion of a punch and die set whether in a loading cartridge or in machine operating position, wherein a key is used with a die shoe to prevent lateral movement of the die regardless of extent by which the die is sharpened and continued to be used with the die shoe, and wherein a die is used with the die shoe to minimize jagged or sharp edges being created from sharpening processes thereof.

The press device includes a press device body and moving bolsters. The press device body has a slide and a slide servomotor. The slide has upper dies attached thereto. The slide servomotor moves the slide up and down. The moving bolsters are able to move between a pressing position, which is a position on the inside of the press device body, and a die replacement position, which is a position on the outside of the press device body, and have lower dies disposed thereon. The moving bolsters have an electrical storage component, a travel motor, and wheels. The electrical storage component stores regenerative electrical power generated by the slide servomotor in the pressing position. Electrical power is supplied from the electrical storage component to the travel motor. The wheels are driven by the travel motor.

The press device includes a press device body and moving bolsters. The press device body has a slide and a slide servomotor. The slide has upper dies attached thereto. The slide servomotor moves the slide up and down. The moving bolsters are able to move between a pressing position, which is a position on the inside of the press device body, and a die replacement position, which is a position on the outside of the press device body, and have lower dies disposed thereon. The moving bolsters have an electrical storage component, a travel motor, and wheels. The electrical storage component stores regenerative electrical power generated by the slide servomotor in the pressing position. Electrical power is supplied from the electrical storage component to the travel motor. The wheels are driven by the travel motor.

The invention concerns a bending tool (6) with an actuating element (19) accessible outside the tool receptacle, with coupled to it a locking element (20) with a locking catch (21) for securing the bending tool (6) in the tool receptacle. The first end portion (32) of the actuating element (19) has an actuating face (33) arranged on the end side and the second end portion (34) of the actuating element (19) has an actuating recess (35).

The invention further concerns a gripping device (14) for manipulating a bending tool (6), comprising a first gripping arm (59) and a second gripping arm (60) displaceable relative to the first gripping arm (59) in the clamping direction (64), said gripping arms (59) being formed to engage in a gripping groove (23, 24) of the bending tool (6) and to clamp the bending tool (6). Also formed is an unlocking member (65) for actuating an actuating element (19) of the bending tool (6), said unlocking member (65) being longitudinally displaceable normally to the clamping direction (64) relative to the gripping arms (59, 60).

The invention relates to a device for changing bending tools (15, 16) in a bending machine (2) for bending metal sheets, in particular in a press brake, comprising at least one tool magazine (6) for storing the bending tools (15, 16), which, when positioned in a working area of the bending machine (2), cause the metal sheets to bend. The at least one tool magazine (6) is arranged on a frame (3) which is configured to be positioned in a free-standing manner without a mechanical connection to the bending machine (2) in an operating position of the device (1), wherein the at least one tool magazine (6) can be moved from a first position out of the frame (3) into a second position, in which at least a part of the tool magazine (6) that can be moved out lies in a contact-free manner within the bending machine (2).

A rotatable buffer turret apparatus on which plural pairs of punches and dies to be set on a turret of a turret punch press are set, includes an upper buffer turret on which punch attachment holes in which the punches can be set are arranged circularly, and a lower buffer turret on which die attachment holes that is associated with the punch attachment holes and in which the dies can be set are arranged circularly. The upper and lower buffer turrets are rotatably attached to a single rotary shaft. A diameter of the lower buffer turret is made larger than a diameter of the upper buffer turret. The die attachment holes are formed in a circular die attachment area having a diameter larger than the diameter of the upper buffer turret. According to the apparatus, a tool exchange manually operated by an operator can be done easily and efficiently.

The present invention is directed to an improved metal strips straightener, including an infeed device and a pressure frame. The infeed device has one or more leveling rollers, and the pressure frame has a roller frame. The roller frame has one or more roller blocks to bring a metal strip into a upward full encirclement wrap. Each roller block is attached with a camshaft, where each camshaft is connected to a motorized drive system. Rotation of the camshafts actuates the roller blocks to move the metal strips, applying pressure on the metal strips during the passing through of the roller blocks. A closing cylinder is attached to one end of a roller block, where the closing cylinder has a convex contact surface. Multiple roller blocks are connected to each adjacent roller blocks via their connected closing cylinders.

An attachment base extending in a left-right direction is provided on a lower end side of a front surface of an upper table of a press brake. On the attachment base, a plurality of protruding tabs protruding downward are formed at intervals in the left-right direction. An upper tool holder is disposed between the protruding tabs adjacent to each other in the left-right direction in the front surface of the attachment base. A connecting member is attached to a back surface of each protruding tab, and the connecting member includes a distal end located on a back side of the upper table. A guide member supporting a moving body movably in the left-right direction is coupled to a distal-end face of the connecting member.