Press brake
AssigneeMurata Machinery, Ltd.
InventorKatsumasa Hattori
Life of this patent
Estimating the term…
Abstract
A press brake includes a ram to which an upper or lower tool can be attached; a movable ram driver; and a controller that controls the ram driver, wherein the ram driver includes a rotation/linear motion converter composed of a screw fixed to the ram and moves upward and downward as the ram moves upward and downward, and a nut screw-coupled with the screw; a drive rotation body arranged rotatably about a rotation axis of the nut; a first motor arranged in a fixed state; a first power transmitter that transmits rotation of the first motor to the nut at high speed and with low torque; a second motor arranged in a fixed state; a second power transmitter that transmits rotation of the second motor to the drive rotation body at low speed and with high torque; and a clutch provided between the nut and the drive rotation body.
Claims18
A press brake that performs bending work on a workpiece by holding the workpiece between an upper tool and a lower tool, the press brake comprising:
- a ram to which the upper tool or the lower tool can be attached;
- a ram driver that moves the ram upward and downward;
- and
- a controller that controls the ram driver, wherein the ram driver includes:
- a rotation/linear motion converter composed of a screw fixed to the ram and moves upward and downward as the ram moves upward and downward, and a nut screw-coupled with the screw;
- a drive rotation body arranged apart from the nut in an axial direction of the screw and arranged rotatably about a rotation axis of the nut;
- a first motor arranged in a fixed state;
- a first power transmitter that transmits rotation of the first motor to the nut at high speed and with low torque;
- a second motor arranged in a fixed state;
- a second power transmitter that transmits rotation of the second motor to the drive rotation body at low speed and with high torque;
- and
- a clutch provided between the nut and the drive rotation body and that couples the nut and the drive rotation body into an integrated rotation body.
A press brake that performs bending work on a workpiece by holding the workpiece between an upper tool and a lower tool, the press brake comprising:
- a ram to which the upper tool or the lower tool can be attached;
- a frame installed on a floor surface and that guides the ram in a vertical direction;
- a ram driver that moves the ram upward and downward;
- and
- a controller that controls the ram driver, wherein the ram driver includes:
- a rotation/linear motion converter composed of a screw and a nut screw-coupled with the screw, one of the screw and the nut is fixed to the ram, and the other one of the screw and the nut is fixed to the frame;
- a first motor fixed to the ram or the frame;
- a second motor fixed to the ram or the frame, to which the first motor is fixed;
- a drive rotation body arranged apart in an axial direction of the screw from the nut or the screw rotated by the first motor while being able to rotate about a rotation axis of the nut or the screw, and is rotated by the second motor;
- and
- a clutch provided between the nut or the screw rotated by the first motor and the drive rotation body, and couples the nut or the screw and the drive rotation body into an integrated rotation body.
Dependencies are inferred from the claim text.