Abstract: In an injection molding system, a rack on which a peripheral device can be mounted includes a fixing unit for removably fixing to a machine stool of an injection molding machine and a moving unit for making the rack movable alone. Accordingly, maintenance of the injection molding machine can be performed satisfactorily and positioning work is also made easier so that the rack can be transported easily.

Abstract: In an injection molding system, a rack on which a peripheral device can be mounted includes a fixing unit for removably fixing to a machine stool of an injection molding machine and a moving unit for making the rack movable alone. Accordingly, maintenance of the injection molding machine can be performed satisfactorily and positioning work is also made easier so that the rack can be transported easily.

Abstract: A plurality of connecting rods are attached to an injection device located opposite a stationary platen on a base structure of an injection molding machine. The stationary platen is provided with a magnetism generating unit formed of a permanent magnet, and the connecting rods are provided with a magnetic body. As the magnetism generating unit and the magnetic body are attracted to each other by magnetism, a nozzle of an injection unit is brought into contact with a mold. By this structure, the stationary platen can be prevented from inclining during nozzle touch operation.

Abstract: An injection molding machine is provided with an automatic mold thickness adjusting apparatus. The amount of compensation of the position of a rear platen that is adjusted at the time of installation of a mold is determined by calculating the thermal expansion of the mold that is expected to occur at the completion of a rise in temperature based on the difference in temperature between the mold temperature at the time of mold thickness adjustment and the mold temperature at the time of injection molding. Then, the rear platen is moved to the compensated position thus determined.

Abstract: A plurality of connecting rods are attached to an injection device located opposite a stationary platen on a base structure of an injection molding machine. The stationary platen is provided with a magnetism generating unit formed of a permanent magnet, and the connecting rods are provided with a magnetic body. As the magnetism generating unit and the magnetic body are attracted to each other by magnetism, a nozzle of an injection unit is brought into contact with a mold. By this structure, the stationary platen can be prevented from inclining during nozzle touch operation.

Abstract: An injection molding machine is provided with an automatic mold thickness adjusting apparatus. The amount of compensation of the position of a rear platen that is adjusted at the time of installation of a mold is determined by calculating the thermal expansion of the mold that is expected to occur at the completion of a rise in temperature based on the difference in temperature between the mold temperature at the time of mold thickness adjustment and the mold temperature at the time of injection molding. Then, the rear platen is moved to the compensated position thus determined.

Abstract: The invention provides an injection molding machine that prevents inclination of a stationary platen by a nozzle touch force. A groove is formed in a base along the axis of injection. Protrusions are provided on both lateral sides of the stationary platen. A bottom of the stationary platen is fixed on a bottom of the groove and bottoms of the protrusions are fixed on tops of ridged formed at opposite sides of the groove. A nozzle touch force applied by a nozzle provided on the front of a screw cylinder is applied against substantially the center portion of the stationary platen.

Abstract: An aligning device whereby an injection nozzle can be easily aligned with the sprue of a mold. A stationary platen has a locating hole formed therein and a tapered portion continuous with the locating hole and tapered in a direction such that the tapered portion broadens toward the injection nozzle side. An aligning jig to be fitted into the locating hole and the tapered portion is prepared. The jig has a recess formed in the center of an end face thereof and having a shape matching that of the distal end of the injection nozzle. The jig is fitted into the locating hole, and the injection nozzle is engaged with the recess to align the injection nozzle with the axis of the locating hole. Since the mold is attached to the stationary platen such that the axis of the sprue of the mold is aligned with that of the locating hole, the injection nozzle becomes aligned with the sprue.

Abstract: A connecting member is formed by an upper plate portion and a side plate portion. One end of the upper plate portion is fixed to a fixed platen of an injection molding machine, and a lower end of the side plate portion is fixed to a base frame to which the fixed platen is fixed. This connecting member prevents the fixed platen from being tilted when a nozzle touch force is applied from an injection apparatus.

Abstract: The invention provides an injection molding machine that prevents inclination of a stationary platen by a nozzle touch force. A groove is formed in a base along the axis of injection. Protrusions are provided on both lateral sides of the stationary platen. A bottom of the stationary platen is fixed on a bottom of the groove and bottoms of the protrusions are fixed on tops of ridged formed at opposite sides of the groove. A nozzle touch force applied by a nozzle provided on the front of a screw cylinder is applied against substantially the center portion of the stationary platen.

Abstract: An injection mechanism for an injection molding machine includes a front plate carrying an injection cylinder. A guide rod is arranged fixedly relative to the front plate, and defines a longitudinal guiding axis. A movable plate is arranged movably relative to said front plate along said guiding axis, and carries an injection screw. A support structure is interposed between the guide rod and the movable plate, and movably supports the movable plate on the guide rod along the guiding axis. The support structure including a ball-engaging surface is provided on the guide rod and a ball-spline nut is provided in the movable plate. The ball-spline nut is engaged with the ball-engaging surface.

Abstract: A fixed platen and a rear platen of an injection molding machine are connected to each other via tie bars. A coil spring is disposed between the tie bar and the rear platen such that the rear platen is urged in a direction away from the fixed platen. A mold thickness adjusting member such as a nut is also provided for causing the rear platen to move along the tie bar toward the fixed platen against the resilience of the urging means.

Abstract: A connecting member is formed by an upper plate portion and a side plate portion. One end of the upper plate portion is fixed to a fixed platen of an injection molding machine, and a lower end of the side plate portion is fixed to a base frame to which the fixed platen is fixed. This connecting member prevents the fixed platen from being tilted when a nozzle touch force is applied from an injection apparatus.

Abstract: An aligning device whereby an injection nozzle can be easily aligned with the sprue of a mold. A stationary platen has a locating hole formed therein and a tapered portion continuous with the locating hole and tapered in a direction such that the tapered portion broadens toward the injection nozzle side. An aligning jig to be fitted into the locating hole and the tapered portion is prepared. The jig has a recess formed in the center of an end face thereof and having a shape matching that of the distal end of the injection nozzle. The jig is fitted into the locating hole, and the injection nozzle is engaged with the recess to align the injection nozzle with the axis of the locating hole. Since the mold is attached to the stationary platen such that the axis of the sprue of the mold is aligned with that of the locating hole, the injection nozzle becomes aligned with the sprue.

Abstract: A ball screw attached to a lower portion of a fixed platen is rotated, thereby moving a nut member forward and moving an injection device forward through a spring. By moving the injection device forward, a nozzle on a tip end of a screw cylinder is abutted against the fixed platen, and a nozzle touch force is applied to the fixed platen by a compressive force of the spring. A connection member is provided between an upper portion of the fixed platen and a front plate of the injection device so as to be able to connect or disconnect the fixed platen to or from the front plate. Even if the nozzle touch force acts on the fixed platen, the fixed platen is supported by the upper portion and the lower portion of the fixed platen and is prevented from falling down.

Abstract: An injection mechanism for an injection molding machine includes a front plate carrying an injection cylinder. A guide rod is arranged fixedly relative to the front plate, and defines a longitudinal guiding axis. A movable plate is arranged movably relative to said front plate along said guiding axis, and carries an injection screw. A support structure is interposed between the guide rod and the movable plate, and movably supports the movable plate on the guide rod along the guiding axis. The support structure including a ball-engaging surface is provided on the guide rod and a ball-spline nut is provided in the movable plate. The ball-spline nut is engaged with the ball-engaging surface.

Abstract: A tetragonal prism having a rectangular cross section is attached, as a linear motor movable section, to a moving plate to which a screw is attached rotatably and also immovably in an axial direction. A magnet is attached to each surface of the movable section. A hole section is provided in an outer frame. A linear motor coil is provided on the linear motor fixed section so that it may face the magnet on the surface of the movable section. A screw shaft is rotated by a motor through a measuring shaft penetrating a center of the movable section. By driving the linear motor comprising the magnet and the coil corresponding to each other, the screw is moved and injected in an axial direction. The fixed section is detachable and a gap between the magnet and the coil can be easily adjusted.

Abstract: A mold clamping device suitable for use in a small injection molding machine and manufacturable with low cost in which a sufficient clamping force is obtained by small number of parts. A link mechanism having a first link member and a second link member is provided between a rear platen and a movable platen. One end and the other end of the first link member are pivotally connected to the movable platen and the second link member, respectively. The second member is connected to the rear platen to be linearly movable with one end slidable along a linear guide provided at the rear platen. A stationary member of a linear motor is arranged at the rear platen and a movable member of the linear motor is provided at the second link member to surround the stationary member. The second link member is linearly moved by the linear motor to expand and fold the link mechanism so that mold halves attached to the stationary platen and the movable platen, respectively are closed to be clamped and opened to be unclamped.

Abstract: A motor is driven in a state where the moving platen of an injection molding machine is not mounted with a mold to protrude an ejector rod and the driving current of the motor is measured for each predetermined protrusion position. Then, the moving platen is mounted with the mold and the motor is driven to protrude the ejector rod, and the driving current of the motor is measured. It is determined that an ejector rod protrusion position where a difference between this measured current value and a current value stored in a data table becomes larger is the protrusion start position of an ejector pin.

Abstract: A fixed platen and a rear platen of an injection molding machine are connected to each other via tie bars. A coil spring is disposed between the tie bar and the rear platen such that the rear platen is urged in a direction away from the fixed platen. A mold thickness adjusting member such as a nut is also provided for causing the rear platen to move along the tie bar toward the fixed platen against the resilience of the urging means.