Abstract: A dynamic balance device for a press machine includes a plurality of cam portions which transmit a vertical motion of a slide to a balance weight to move the balance weight in a reverse direction of the vertical motion of the slide. The cam portions are each movable in a direction substantially orthogonal to a moving direction of the slide, and each include a first inclined surface and a second inclined surface. The first inclined surface has an inclination angle corresponding to an inclination angle of an inclined surface formed on a member which is provided integrally with the slide and vertically moves with the slide. The second inclined surface has an inclination angle corresponding to an inclination angle of an inclined surface formed on the balance weight.

Abstract: A servo press system in which a servo transfer device implements a transfer operation by utilizing first transfer operation instruction information that is generated depending on a mechanical motion state of a press element of a servo press or second transfer operation instruction information that is generated independently of the mechanical motion state of the press element during a press operation using a pendulum motion.

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 transferring apparatus is composed of a first arm swingably provided around a first axis of a pedestal, a second arm whose length is different to the first arm is swingably provided around a second axis, a hand attached to the front end of the second arm, and a first motor to reciprocatingly swings the first arm provided in the pedestal. A first pinion is fixed to the pedestal concentrically to the first shaft, and a second pinion is fixed to the base end of the second arm concentrically with the second axis. Further, racks are provided in the both of left and right side of the first pinion and the second pinion. A large transferring apparatus is composed so that two transferring apparatus are arranged in one pair, the hand are mutually coupled by a transfer beam.

Abstract: A conveyor system has a monitor for entering information about sheets, an input/output control console for setting operating conditions of a first conveyor and a second conveyor based on the information about the sheets, and a power control console for operating the first conveyor and the second conveyor based on the operating conditions. The information about the sheets includes information as to the length of each of the sheets and data as to the position where the sheets are loaded from a press. A conveyor feed length representative of a feed cycle of a sheet on the first conveyor and the second conveyor, and the number of sheets on the second conveyor are automatically determined based on the length of the sheets and the data.

Abstract: A workpiece processing system having, a first assembly for performing at least a first processing operation on a workpiece at a first location and having a frame, a nesting assembly, a bolster assembly upon which a workpiece can be supported at the first processing location, and a transfer assembly. The bolster assembly is repositionable relative to the frame by movement along a first path between first and second positions. The transfer assembly is capable of moving a workpiece to/from the first processing location along a second path from/to the nesting assembly. The nesting assembly has first and second workpiece support elements, each with a length. The first and second workpiece support elements are each repositionable relative to the bolster assembly between a) an operating orientation wherein the lengths of the first and second workpiece support elements project generally in the direction of the second path, and b) a stored orientation.

Abstract: A transfer apparatus for use in a press in which successive workpieces are sequentially transferred from one to the next of a plurality of working stages arranged along a line. The transfer apparatus has a transfer bar having a plurality of workpiece holding devices such as air chucks each being capable of holding and releasing the workpiece, and a driving unit provided at the rear side of the press.

Abstract: A screw mechanism is used to change the shut height of a mechanical press. A clearance between thread faces of a female screw and a male screw in this screw mechanism is shifted to one of the thread faces, on which an operating load of the press acts, by pressing the other thread face, which receives the operating load, by the action of a hydraulic force from a hydraulic cylinder mechanism, by which the clearance is always positioned on the side of one thread face. Since the female and male screws cannot rotate relatively and put in a lock state while the thread faces are pressed to one side, the position of a slide does not change even if the press is driven in this state. A hydraulic cylinder for quick die opening is provided separate from a hydraulic cylinder for locking the female and male screws in the shut height adjustment, by which the slide is moved upward or downward.

Abstract: A mechanism for rotating a crankshaft at ununiform speeds through a main gear and a slider mechanism and a mechanism for rotating a crankshaft at a uniform speed through a main gear fixed to the crankshaft are constructed such that the distances between the centers of rotation of respective main gears and the centers of respective drive shafts are the same. A speed reducing ratio between a drive gear mounted on the drive shaft and the main gear is set to be the same, and the positions of the crankshaft and the drive shaft are set to be the same for both the mechanisms. When rotating the crankshaft at ununiform speeds, a lever provided for the slider mechanism is disposed to orient 180 degree out of phase with respect to the eccentric direction of a crankpin. This obviates a rotation balancing weight which has been provided on the crankshaft in the prior art.

Abstract: A multi-slide mechanical press comprising a plurality of slides, wherein each of the slides is provided with a guide that reciprocatingly drives the associated slide, without having to increase the pitch between slides, and that makes it possible to eliminate the effects of the presence of a gap around a slide adjust screw section. In the multi-slide mechanical press, the upper section of each slide is prismatic, while the lower section is cylindrical. Pressure-bearing guides disposed at the frame are provided so as to oppose the front and back sides of the prismatic section. A cylindrical guide provided in the frame for the cylindrical section of each slide guide guides the slide vertically but without allowing it to rotate.

Abstract: Disclosed is a method according to which workpieces are fed and subjected to stamping by continuously operating a press in which a plurality of slides operating with a difference in phase are arranged laterally in a straight line. A longitudinal feeding device for longitudinally feeding workpieces is provided in each slide. Each slide and the longitudinal feeding device thereof operate in synchronism with each other, so that even when the press is continuously operated, the workpieces can be fed without involving any interference between the press and the transfer device. Further, the feeding of workpieces in the lateral direction, which is executed as needed, is effected outside the machining stage, so that there is no interference regardless of the difference in phase of the slides, whereby it is possible to feed workpieces without having to intermittently operate the press.

Abstract: A slide bottom dead center position compensating device comprises an angle sensor for detecting a crank angle, a contact sensor for detecting contact between stoppers on molds or, instead of the contact sensor, a position sensor for detecting that a slide has reached a preset control position near the bottom dead center of the slide, a controller, a setting unit for setting a control condition for the slide bottom dead center position, and a bottom dead center compensating unit. The controller determines a crankshaft rotational angle during the contact between the stoppers or a crankshaft rotational angle under a condition of the slide descending from the control position, calculates a slide compensation amount necessary for making the determined crankshaft rotational angle equal to a control rotational angle preset by the setting unit, and compensates the bottom dead center position of the slide through a bottom dead center compensating unit in accordance with the calculated slide compensation amount.

Abstract: Disclosed is a blanking method according to which, when producing a part by blanking from a plate material, a forming process consisting of coining is performed on the upper and lower surfaces of that portion of the plate material which becomes a scrap after the blanking. By the energy needed for this coining, the strain energy accumulated in the press as a result of the blanking of the part is absorbed. In this method, the breakthrough generated when producing parts by blanking with a press and a die can be mitigated or eliminated.

Abstract: An apparatus for adjusting bottom-dead-center position of a slide in mechanical press including a connecting rod 4 connected to a crank shaft 3, and a hydraulic cylinder 15 provided between the connecting rod 4 and a slide 5. The hydraulic cylinder 15 has a piston rod 16 having one end connected to the connecting rod 4, a cylinder body 17 capable of moving relative to the piston rod 16, a hydraulic chamber 27 formed below a piston portion 16A, and a pressure adjusting means 45 connected to this hydraulic chamber 27. An extending member 19 for connecting the connecting rod and the cylinder body is fitted around an outer periphery of the piston rod 16, and the adjustment of the bottom-dead-center position of the slide can be effected as the extending member 19 is extended by the adjustment of hydraulic pressure within the hydraulic chamber 27.

Abstract: An ON-OFF control of a clutch-brake for a press machine, having fail-safe operation. The clutch-brake drive control is provided by turning double solenoid valves on and off. Two lines of drive control signal generators output drive control signals to semiconductor elements when a running command pulse signal is recognized as valid. A bus collating circuit forcibly cuts off AC power supplies of solenoid driving circuits when synchronization and coordination of the operation of each of the lines are checked and found not in coordination. Two lines of fault detecting circuitry forcibly cuts off the AC power supplies of the solenoid driving circuits by automatically detecting a fault of the semiconductor elements.

Abstract: An apparatus for use with a press which corrects the spacing between an upper die and a lower die when the press is at bottom dead center. The apparatus includes a detector which is operative during each cycle of reciprocal movement of the press slide to detect the spacing between the upper and lower dies, a comparator which compares the detected spacing during each cycle with a prior spacing, an axially expansible/contractible piezoelectric actuator mounted on the press so that its axial length affects the spacing between the upper and lower dies when the press is at bottom dead center, and a drive circuit which is responsive to a deviation signal from the comparator to drive the actuator with a high voltage so as to expand or contract its axial length according to the difference between the detected and prior spacing of the dies.

Abstract: A Slide driving apparatus of press machine, wherein a main gear 3 as a rotational drive member and a lever member 10 as a driven member are opposed to one another in a eccentric state which an axes O.sub.1 and O.sub.2 are separated, the main gear 3 and the lever member 10 being connected to one another by a connecting member 13 consisting of a pin member 11 and a bush member 12. A drive rotation locus A which can be traced, round the axis O.sub.1, by a movement of a connecting center O.sub.5 where the main gear 3 and the connecting member 13 are connected, and a driven rotation locus B which can be traced, round the axis O.sub.2, by a movement of a connecting center O.sub.4 where the lever member 10 and the connecting member 13 are connected, intersect one another at points of C and D. A slide of the press machine is connected, by the connecting rod, to an eccentric portion 8A of the crankshaft 8 where the lever member 10 is fixed.

Abstract: This invention relates to a forming machine used for full enclosed die forming etc. The forming machine of this invention consists of inserting a punch into at least one of a pair of dies disposed to face each other, supporting the die having the punch inserted therein by one end of a ring member accommodated in a holder, and disposing the other end of the ring member within a cylinder chamber formed within the holder; the above ring member has a piston member disposed within it, the above punch is supported by one end of the piston member, and the other end of the piston member is disposed in the above cylinder chamber formed within the holder or a cylinder chamber communicated with the holder.

Abstract: A predetermined amount of melted thermoplastic resin of raw material is injected into a molding space which is previously set to a temperature higher than that at which the resin beings to harden under atmospheric pressure and which has a capacity larger than a volume of a product. The injected resin is cooled in the molding space and pressurized before the resin is cooled to the temperature at which the resin begins to harden under atmospheric pressure. When pressurized, the glass transition temperature of the thermoplastic resin is shifted to a higher temperature so that the thermoplastic resin hardens in slight reduction of the temperature. The resin is cooled in the pressurized state until the resin possesses the dynamic rigidity under room temperature and atmospheric pressure.

Abstract: An injection molding method with stamping compression obtains an optical lens or other molded article from thermoplastic resin. A cavity is heated to a temperature at which resin can be maintained in a molten state under normal temperature. Measured and molten resin is injected into the heated cavity through a sprue part, a runner part and a gate part. After the injection, the sprue part is sealed. The injected resin is maintained in the molten state at this time. The injected resin is then hardened in the heated cavity by applying a pressure which can provide a dynamic modulus of elasticity of the resin at the normal temperature and normal pressure. The resin hardened by the pressurization is then cooled to a removal temperature while reducing the pressure so as to maintain the dynamic modulus of elasticity of the resin at the dynamic modulus of elasticity of the resin at normal temperature and normal pressure.