Abstract: In a die-cushion device of a press machine a controller controls an opening degree of a proportional flow-rate control valve to an appropriate opening degree in order to control the flow rate flowing out of a lower chamber of a hydraulic cylinder supporting a cushion pad before a slide collides against the cushion pad using a die-cushion pressure command commanded from a commander in advance and a slide speed signal inputted from a slide speed detector. By this, generation of a surge pressure when a slide collides against the cushion pad at a high speed is restricted.

Abstract: A die cushion apparatus of a press machine in which a discharge opening of a fluid hydraulic pump/motor is directly connected to a pressure chamber on a cushion pressure production side of a fluid hydraulic cylinder and the torque of a rotating shaft of the fluid hydraulic pump/motor is controlled by an electric motor to control a pressure (die cushion pressure) of the pressure chamber on the cushion pressure production side. It is therefore possible to control the die cushion pressure with excellent responsiveness with respect to a die cushion pressure command and prevent occurrence of a surge pressure. The die cushion apparatus also has excellent energy efficiency since energy required for a die cushioning action that a cushion pad receives when effecting die cushioning of a press machine is regenerated as electrical energy through the fluid hydraulic cylinder, fluid hydraulic pump/motor, and electric motor.

Abstract: A die cushion device for a press machine includes: a hydraulic cylinder for supporting a cushion pad and generating a die cushion pressure when a slide of the press machine moves downward; a proportional valve and a hydraulic pump/motor connected in parallel between a lower chamber of the hydraulic cylinder and a low-pressure source; an electric motor connected to a rotating shaft of the hydraulic pump/motor; a die cushion pressure command issuer for outputting a predetermined die cushion pressure command; a pressure detector for detecting a pressure in the lower chamber of the hydraulic cylinder; and a controller for controlling an aperture of the proportional valve and a torque of the electric motor in a manner that the die cushion pressure becomes equal to a pressure corresponding to the die cushion pressure command, based on the die cushion pressure command and the pressure detected by the pressure detector.

Abstract: Electrons are prevented from being made incident onto an insulation part between dynodes to improve a withstand voltage.

Abstract: In a die-cushion device of a press machine a controller controls an opening degree of a proportional flow-rate control valve to an appropriate opening degree in order to control the flow rate flowing out of a lower chamber of a hydraulic cylinder supporting a cushion pad before a slide collides against the cushion pad using a die-cushion pressure command commanded from a commander in advance and a slide speed signal inputted from a slide speed detector. By this, generation of a surge pressure when a slide collides against the cushion pad at a high speed is restricted.

Abstract: A die cushion apparatus of a press machine in which a discharge opening of a fluid hydraulic pump/motor is directly connected to a pressure chamber on a cushion pressure production side of a fluid hydraulic cylinder and the torque of a rotating shaft of the fluid hydraulic pump/motor is controlled by an electric motor to control a pressure (die cushion pressure) of the pressure chamber on the cushion pressure production side. It is therefore possible to control the die cushion pressure with excellent responsiveness with respect to a die cushion pressure command and prevent occurrence of a surge pressure. The die cushion apparatus also has excellent energy efficiency since energy required for a die cushioning action that a cushion pad receives when effecting die cushioning of a press machine is regenerated as electrical energy through the fluid hydraulic cylinder, fluid hydraulic pump/motor, and electric motor.

Abstract: A slide of a press machine is driven by composite thrust of thrust of an electric (servo) motor SM (via a screw/nut mechanism from the electric motor) and thrust of hydraulic cylinders SYL1, SYL2 to which pressure oil is supplied from a constant, high pressure source. A slide control device controls the electric motor SM and the hydraulic cylinders SYL1, SYL2, based on a slide position signal and a motor angular velocity signal, and at the same time, makes the hydraulic cylinder SYL1 work as a pump during a period when slide load is small, charging pressure oil to the constant, high pressure source by using the thrust transferred from the electric motor to the hydraulic cylinder SYL1 through the screw/nut mechanism and the slide.

Abstract: A slide of a press machine is driven by composite thrust of thrust of an electric (servo) motor SM (via a screw/nut mechanism from the electric motor) and thrust of hydraulic cylinders SYL1, SYL2 to which pressure oil is supplied from a constant, high pressure source. A slide control device controls the electric motor SM and the hydraulic cylinders SYL1, SYL2, based on a slide position signal and a motor angular velocity signal, and at the same time, makes the hydraulic cylinder SYL1 work as a pump during a period when slide load is small, charging pressure oil to the constant, high pressure source by using the thrust transferred from the electric motor to the hydraulic cylinder SYL1 through the screw/nut mechanism and the slide.

Abstract: A semiconductor photocathode of the present invention is provided with: a support substrate 10; a photoelectric surface 30 which is formed of a plurality of semiconductor layers layered on this support substrate 10 and which emits photoelectrons from a photoelectron emitting surface 341 in response to the incidence of light to be detected; and a metal electrode 35 which is formed in film form so as to coat at least a portion of support substrate 10 and a portion of photoelectric surface 30 and which makes ohmic contact with the photoelectric surface, wherein metal electrode 30 in film form includes titanium and the electron affinity of photoelectron emitting surface 341, which is an exposed portion of photoelectric surface 30 without being coated with metal electrode 35 in film form, is in a negative condition.

Abstract: An electric motor and hydraulic pump/motor are combined on a torque level, a press machine is controlled with controllability of an electric motor, and kinetic energy of a slide is regenerated during braking without constraints of slide pressurization or an amount of energy. A screw press drives a slide through a screw mechanism made up of a drive nut and a driven screw. The drive nut is provided with a ring gear integral therewith and this ring gear is engaged with a gear provided for a drive axis of an electric motor and a gear provided for the drive axis of a hydraulic pump/motor. The hydraulic pump/motor is connected to a constant high pressure source that generates a quasi-constant pressure hydraulic liquid and a low pressure source. This allows the electric motor and hydraulic pump/motor to be combined on a torque level.

Abstract: An electric motor and hydraulic pump/motor are combined on a torque level, a press machine is controlled with controllability of an electric motor, and kinetic energy of a slide is regenerated during braking without constraints of slide pressurization or an amount of energy. A screw press drives a slide through a screw mechanism made up of a drive nut and a driven screw. The drive nut is provided with a ring gear integral therewith and this ring gear is engaged with a gear provided for a drive axis of an electric motor and a gear provided for the drive axis of a hydraulic pump/motor. The hydraulic pump/motor is connected to a constant high pressure source that generates a quasi-constant pressure hydraulic liquid and a low pressure source. This allows the electric motor and hydraulic pump/motor to be combined on a torque level.

Abstract: A slide driving device employs a variable-displacement pump/motor for driving a rotating element of the slide driving device. The displacement volume of the variable-displacement pump/motor, whose output drives the slide, is varied in response to deviation of measured driver parameters from commanded driver parameters. An energy storage device temporarily absorbs excess energy during a portion of a molding cycle, and returns the energy to the system for re-use. In one embodiment, the energy storage device is an accumulator. In a second embodiment, the energy storage device is a flywheel. The combination of variable displacement volume and energy storage maintains the fluid pressure substantially constant during a cycle of the slide driving device.

Abstract: An in-line screw type injection molding machine having a screw in a heating cylinder. The screw is driven and rotated by a motor to charge a feedstock resin into the cylinder, the screw simultaneously undergoing retracting movement to allow the molten resin to be stored in the cylinder, and is driven and advanced to inject the molten resin.

Abstract: Disclosed is a shutter-type clamping device which is equipped with: a stationary platen; a movable platen; a base plate; a clamping piston which is lodged in a cylinder provided on the base plate and which has a hollow section; a protrusion provided on the movable platen and having configuration which allows it to enter the hollow section of the piston; and a shutter which allows or hinders the entry of the protrusion into the hollow section; the shutter being attached to the piston and arranged in such a manner as to be capable of moving forwards and backwards and incapable of rotating with respect to a member on the side of the base plate.