Abstract: A stationary platen and link housing are coupled to each other through tie bars. A movable platen is coupled to a front surface of the link housing through a toggle mechanism. Two slide bars are fixed to the back surface of the movable platen and each slide bar extends in a parallel way from a back surface toward the moving direction of the movable platen. Two hollow shafts are each fixed to the front surface of the link housing so as to correspond to the slide bar. Each hollow shaft extends in a parallel way from a front surface toward the moving direction of the movable platen. Each respective slide bar is inserted into the inside of the corresponding hollow shaft to allow it to slide along the inside of the hollow shaft.

Abstract: An injection machine of a hierarchical structure type according to the present invention includes a rest having a plurality of floors, a first injection molder mounted on a first floor of the rest, and a second injection molder mounted on a second floor of the rest. The first injection molder and the second injection molder are controlled by an integrated control board. A set display device is provided which is capable of transmitting data of the first and second injection molders between the set display device and the integrated control board in order to set or display the data.

Abstract: A screw is incorporated in a heating barrel, and the tail end of the screw is rotatably supported by the front surface of an intermediate plate. Behind the intermediate plate, two linear motor units are connected in parallel and arranged around the shaft of the screw to form axial symmetry. The output shafts of the linear motor units are connected to the tail end of a driving shaft through a common connecting arm, and the leading end of the driving shaft is fixed to the rear surface of the intermediate plate. Each of the liner motor units is constituted by a plurality of voice coil linear motors connected in parallel. Each of the linear motor units can be independently controlled. Voice-coil linear motors to be used are selected according to the type of product to be manufactured.

Abstract: The tail end of a heating barrel is supported by a front plate. The tail end portion of a screw is rotatably supported by an intermediate plate. Bearings are built in the rear plate. The nut of each of ball screws is attached to the front surface of the rear plate through a hollow shaft and the bearing. Through holes are provided in the intermediate plate. To the front surface of the intermediate plate are fixed load cells so as to block the front of the through holes. The leading end portion of the threaded rod of each of the ball screws and leading end portion of the nut are inserted in each of the through holes. The leading end of the threaded rod is fixed to the rear surface of the load cell.

Abstract: A direct type clamping assembly for a motorized injection molding machine to maintain a clamping force for a predetermined time without causing motor stalling is disclosed. A stationary platen and back plate are fixedly attached to a base, and a movable platen is slidingly associated with the base. A housing is disposed in front of the back plate with coil springs disposed between the housing and the back plate. A nut of a ball-screw assembly is rotatably accommodated in the housing with a bearing. When the ball-screw assembly is rotatably driven, the movable platen moves forward, stopping when a mold is completely joined together. The housing can accordingly move backward as the ball-screw assembly is further rotatably driven, compressing the coil springs and generating and maintaining the clamping force. Slight rotation of the motor prevents motor stalling, and the resulting slight movement of the housing scarcely influences the clamping force.

Abstract: Provided is a clamping unit for die clamping with a die-clamping force directly applied to dies consisting of a stationary die and a movable die, including a stationary platen for holding the stationary die, a movable platen for holding the movable die, the movable platen being disposed opposite to the stationary platen, and a linear guiding system for guiding the movement of the movable platen.

Abstract: A stationary die is held on the front surface of a stationary platen and a movable die is held on the front surface of a movable platen. A plurality of monitoring sections are set in advance within a moving range of the movable platen and an upper limit of forward thrust of the movable platen is set for each of the monitoring sections. When the forward thrust of the movable platen reaches the upper limit set in one of the monitoring sections during a die closing operation, it is determined that abnormality occurs to stop the movable platen from moving forward. If a die closing mechanism is of a toggle link type, the forward thrust of the movable platen is calculated based on the thrust of a crosshead which drives a toggle link mechanism, the moving speed of the crosshead, and the moving speed of the movable platen.

Abstract: There is provided a molding machine controlling unit and method capable or preventing the operation of a molding machine from suddenly stopping due to the temperature of an electric motor.

Abstract: The present invention is directed to a method of monitoring operation data for quality control with a little possibility that a nondefective product is mistakenly determined as a defective product even if the operation data fluctuates in a large waviness curve. Every time an operation data piece for quality control is obtained, a moving average of the predetermined number of data pieces lately obtained is calculated. When the deviation of a data piece from the moving average exceeds the tolerance limit, an alarm is generated. By employing the method of the present invention for monitoring operation data such as charging time, injection time and the amount of cushion in an injection-molding machine, the accuracy of determination as to a defective or nondefective can be improved.

Abstract: An object of the present invention is to provide an electric direct-acting die clamping unit of an injection molding machine whose entire length can be reduced. A movable platen is arranged to face a stationary platen. A stationary die is attached to the stationary platen, whereas a movable die is attached to the movable platen. The movable platen is connected to the front of the backup plate. A nut of a ball screw is fixed at each of diagonally-opposed corners of the backup plate. The threaded rod of the ball screw passes through the backup plate via the nut. The tip portion of the threaded rod is rotatably connected to the stationary platen. The rear end portion of the threaded rod is threaded through a support plate via the bearing and connected to a motor.

Abstract: An object of the present invention is to suppress a clamping force from sharply increasing when dies are clamped in an electric direct-acting die clamping unit of an injection molding machine. A movable platen is arranged to face a stationary platen. A stationary die is attached to the front surface of the stationary platen, whereas a movable die is attached to the front surface of the movable platen. The movable platen is connected to the front surface of a backup plate via four coil springs. A nut of a ball screw is fixed at each of diagonally-opposed corners of the backup plate. The threaded rod of the ball screw passes through the backup plate via the nut. The tip portion of the threaded rod is rotatably connected to the stationary platen. The rear end portion of the threaded rod is connected to a motor.

Abstract: An object of the present invention is to suppress clamping force from sharply increasing when dies are clamped in an electric direct-acting die clamping unit of an injection molding machine. A stationary platen and a back plate are arranged at both ends of a base. A movable platen is arranged to face a stationary platen. A stationary die is attached to the stationary platen, whereas a movable die is attached to the movable platen. The tip portion of a threaded rod of a ball screw is fixed at the back surface of the movable platen via a load cell. A nut of the ball screw is accommodated in a housing and supported by the bearing. The housing is connected to the front surface of the back plate via the coil spring. When the nut is rotated the threaded rod is driven to move the movable platen back and forth.

Abstract: An object of the present invention is to provide a method of preventing the failure of dies to open because of insufficient die opening force in an electric injection molding machine. A stationary die is attached to a stationary platen, whereas a movable die is attached to the front surface of a movable platen. The movable platen moves along the clamping and unclamping operation by a toggle mechanism. The toggle mechanism is expanded or contracted by a servo motor via a crosshead. A control section controls the operation of the servomotor by sending data of the crosshead position as a feed-back signal. A comparison unit compares a measured torque value of the servomotor with the upper limit value previously set and displays a warning on a display unit when the measured value exceeds the upper limit.

Abstract: In a position control apparatus, the rate and the torque of the servomotor are monitored, wherein when it is detected that the servomotor is locked, the torque is limited, so that renewal of a command position to be supplied to the servomotor driving unit is stopped.

Abstract: A screw is incorporated into a heating barrel. A ball screw is connected to a rear end portion of the screw through a load cell, and a servomotor for injection is connected to the ball screw. First, the heating barrel is retreated and separated from a mold, and the screw is moved to the half stroke position. After the screw is advanced for a preset period of time, the servomotor is stopped by automatic decompression to detect an output of the load cell. Similarly, after the screw is retreated for a preset period of time, the servomotor is stopped by automatic decompression to detect an output of the load cell. An average of outputs of the load cell after the screw advances and retreats is calculated and considered to be an output of the load cell under no-load conditions, thereby performing zero adjustment of the load cell.

Abstract: There is disclosed a mold protection apparatus of an injection molding machine in which a cross head position and movable mold position are read from a correspondence table, a calculator calculates a thrust force limit value set with respect to a movable mold, and a cross head position controller controls a thrust force of the cross head in the corresponding position via a servomotor, so that the thrust force of the cross head is controlled to indicate a limit value or less in accordance with position of the movable mold.

Abstract: A cathode-side first sealed portion (14) and an anode-side first sealed portion (15) are respectively provided at the two opposing ends of a discharge space (21) of a discharge casing (11). A middle chamber (16) filled with a rare gas is provided adjacent to the anode-side first sealed portion (15). A second sealed portion (18) is provided adjacent to the middle chamber (16). Each sealed portion (14),(15),(18) is airtightly sealed by the pinch sealing method. A cathode (22) is welded to a metal foil conductor (24) disposed in the cathode-side first sealed portion (14). An anode (23) is welded to a metal foil conductor (32) disposed in the anode-side first sealed portion (15). The metal foil conductor (32) in the anode-side first sealed portion (15) and a metal foil conductor (35) in the second sealed portion (18) are connected to each other by means of a lead wire (33) passing through the middle chamber (16).

Abstract: An apparatus for a feed-back control of an injection molding machine, comprising a control target which operational conditions are different in accordance with operational purposes; and a control unit for subjecting said control target to a feed-back control, is characterized in that said control unit comprises a judgement function section for judging operational purposes of the control target, a condition setting section for setting operational conditions in accordance with the operational purposes and a switching section for switching the condition setting section through the judgement function section.

Abstract: In a discharge lamp having a discharge medium sealed in a discharge tube assembly including electrodes for producing a discharge, a nitride layer is formed on a surface of an envelope tube of the discharge tube assembly. The nitride layer is formed by substituting an oxygen component of an oxide constituting the tube wall of the envelope tube with nitrogen, and exhibits a continuous and smooth reduction in nitride content in the direction of depth. This chemically stable nitride layer prevents a reaction between the discharge medium and the tube wall material, and removal or injection of the discharge medium. In addition, since the nitride layer also exhibits a continuous change in thermal expansion coefficient in the direction of depth, the thermal stress is reduced, and cracking, peeling, removal, and the like do not occur.

Abstract: The ferrite stainless steel welding rod of this invention comprises the following: 0.03% by weight or less of carbon, 1.00% by weight or less of silicon, 1.00% by weight or less of manganese, from 16.0 to 21.0% by weight of chromium, from 0.30 to 0.80% by weight of niobium, from 0.30 to 0.80% by weight of copper, 0.025% by weight or less of nitrogen, and the balance of iron. The ferrite stainless steel welding rod of this invention offers a good weldability not only in welding stainless steels of the same type but also in welding stainless steels of different types. Further, the welding steel of this invention has a good oxidation resistance, and a good workability and mechanical property.