Abstract: A mold clamping mechanism includes a fixed platen and a movable platen. The fixed platen includes upper and lower, left and right through-holes through which extend tie-bars, and a cutout that extends transversely through the through-holes and divides the through-holes into mold-side holes and opposite-mold-side holes. The fixed platen is divided by the cutout into a mold-side part and an opposite-mold-side part. The mold-side part is provided with main leg parts connected to the bed.

Abstract: A mold clamping apparatus includes a mold clamping cylinder. The mold clamping cylinder has, in a region thereof located below left and right lower tie bars and above left and right sliders, a left grooved portion opened leftward and elongated horizontally, a right grooved portion opened rightward and elongated horizontally, and a leg portion formed between the left and right grooved portions. The leg portion and the left and right grooved portions together form a constricted part.

Abstract: A mold clamping apparatus includes a fixed platen, a mold clamping cylinder, a movable platen moved by the mold clamping cylinder toward the fixed platen, and a mold opening/closing actuator for moving the movable platen or the mold clamping cylinder. The mold clamping apparatus further includes a mold thickness adjustment cylinder provided between the mold clamping cylinder and the movable platen, the mold thickness adjustment cylinder being configured to generate an axial force larger than an axial force in an expanding direction of the mold opening/closing actuator and smaller than an axial force in a contracting direction of the mold clamping cylinder.

Abstract: A molding injection pressure Pi with which a parting opening Lm is formed between a movable mold 2m and a fixed mold 2c during injection-filling and which allows formation of a good molded article is obtained and set in advance. A molding clamping force Pc that allows formation of a good molded article is obtained and set in advance. During production, a mold clamping device Mc is clamped with the molding clamping force Pc, and an injection device Mi to apply the molding injection pressure Pi as a limit pressure Ps is driven to injection-fill a mold 2 with resin R. A parting opening detector 3 that detects the parting opening Lm is provided. During production, reset control is executed to reset the parting opening detector 3 to zero if reset timing tr set in advance has come at least on condition that given preparation for injection is completed after clamping. The reset timing is set in a range covering a given period Zs before injection start time and the given period Zs after the injection start time.

Abstract: An injection device has a heating cylinder, a nozzle adaptor attached to an end of the heating cylinder, a nozzle body attached to an end of the nozzle adaptor, a heater for heating the nozzle body, and a thermocouple for measuring a temperature of the nozzle body. The nozzle body has an outer peripheral surface and a key seat formed in the outer peripheral surface and extending in an axial direction of the nozzle body. The thermocouple includes a plate fitted in the key seat of the nozzle body.

Abstract: A mold-clamping mechanism in which top and bottom tie bars extend between a pressure-receiving platen and a fixed platen fixed to a bed, a movable platen is movably attached to the tie bars, a toggle link extends between the movable platen and the pressure-receiving platen, the movable platen is moved toward the fixed platen by the toggle link, and a mold is clamped by the movable platen and the fixed platen. The pressure-receiving platen includes a bottom part surrounding a central cavity, and a ceiling part for joining respective top ends of left and right wall parts provided upright from both ends of the bottom part. An opening via which the cavity communicates with the outside is provided to the bottom part and the ceiling part.

Abstract: A purge shield provided on an injection molding machine includes a front plate attached to a fixed platen, a top plate extending horizontally from an upper edge of the front plate, and left and right side plates extending vertically downward from left and right side edges, respectively, of the top plate. The top plate includes a fixed plate section and a movable plate section pivotally connected by first hinges to the fixed plate section. The left side plate is pivotally connected by second hinges to the movable plate section and constitutes a lifting plate. A lower end of the lifting plate is connected by a pin to a vertical guide groove formed in the front plate.

Abstract: At a filling termination stage when performing multi-layer molding by means of a hot runner nozzle, an intermediate layer in a multi-layer molded article is prevented from being formed in a shape causing the intermediate layer to enter into a sprue in a portion of a mold cavity in a mold corresponding to the sprue. The multi-layer molded article with no intermediate layer being exposed in a sprue cut portion can be therefore obtained. In this manner, a diameter of a discharge port opening and closing mechanism part for opening and closing the resin discharge ports in the shut pin is made different from a diameter of a nozzle gate opening and closing mechanism part configured of the projection for pushing out the molten resin in the nozzle gate.

Abstract: A movable platen support structure includes: a linear guide mechanism via which a movable platen is provided for horizontal movement; a plurality of movable-platen height adjustment mechanisms provided in corresponding relation to leg sections of the platen, each of the height adjustment mechanisms including a flat plate placed on a corresponding slider of the guide mechanism, and an adjusting bolt screwed into the corresponding leg section of the slider and abutting at its distal end against the flat plate; and a plurality of fastening mechanisms provided in corresponding relation to the leg sections, each of the fastening mechanisms including a fastening bolt for, following the height adjustment by the adjusting bolts, fastening the corresponding leg section to the corresponding slider by being passed through the leg section and the flat plate so as to be screwed into the slider.

Abstract: A PID control system 10 is included to determine the deviation value e of a detection temperature PV and a set temperature SV, to perform PID control such that the deviation value e becomes zero and to output, to the corresponding heating portion 4 or cooling portion 5, only one of a heating operation amount yh which is generated by an I operation output, a D operation output, the deviation value e and a heating side proportional band to perform control on the heating portion 4 and a cooling operation amount yc which is generated by an I operation output, a D operation output, the deviation value e and a cooling side proportional band to perform control on the cooling portions 5, whichever amount is relatively larger.

Abstract: When a heating device is formed which includes at least one or more heaters 4n, 4a, 4b, 4c and 4d that are provided on the outer circumferential surfaces 2f and 3f of at least one of a heating cylinder 2 and an injection nozzle 3 to heat at least one of the heating cylinder 2 and the injection nozzle 3, at least some heaters 4a, 4b, 4c, . . . of all the heaters 4n, 4a, . . . are formed with air cooling-capable heaters 4as, 4bs and 4cs in which a panel member 5 formed of a material R having thermal conductivity is interposed between the heaters 4a, 4b, 4c, . . . and the outer circumferential surfaces 2f and 3f of at least one of the heating cylinder 2 and the injection nozzle 3, in which an air path 6 for air cooling is formed in the panel member 5 and in which an air outlet and inlet portion 8 allowing air A to be passed from an air supply portion 7 is provided in the air path 6.

Abstract: In performing molding by injecting and filling a resin by an injecting device with a predetermined injection pressure into a mold formed of a fixed mold and a movable mold clamped by a clamping device with a predetermined clamping force, at least a clamping device which enables natural compression of the resin with solidification of the resin in the mold is used as the clamping device, a molding injection pressure and a molding clamping force with which a predetermined mold gap is generated between the movable mold and the fixed mold in injection and filling and a non-defective product can be molded are acquired and set in advance, the clamping device is clamped with the molding clamping force during production, the molding injection pressure is set as a limit pressure, and after the resin is injected and filled in the mold by driving the injecting device.

Abstract: A switching purging step (S6 to S13) is provided as a purging process step. The switching purging step (S6 to S13) includes a former purging step (S7) and a latter purring step (S9 to S13) executed after the former purging step (S7). The former purging step (S7) includes introduction of a second molding material R2 into an injection device 1i, and metering operation and purging operation repeated a given number of times. The latter purging step (S9 to S13) includes a metering purging process (S9) and an empty purging process (S11) performed a number of times corresponding to a given repeat count. The metering purging process (S9) includes metering operation with a metering value smaller than that of the former purging step (S7) and purging operation repeated a given number of times. The empty purging process (S11) is performed after the metering purging process (S9).

Abstract: When a plurality of sets of molds, spaced a predetermined distance along a circumferential direction of a rotary platen, are attached through predetermined clamp portions to a mold attachment surface of the rotary platen supported by a movable platen included in a mold clamping device and a mold attachment surface of a fixed platen opposite this mold attachment surface, at least a mold clamping force, when the mold is attached, is previously limited to a limited mold clamping force lower than a mold clamping force at the time of molding. A mold attaching mode is set that has an interlock function of preventing the limitation from being cancelled until a condition under which all the clamp portions are turned on is satisfied. The selected mold attaching mode is performed when the molds are attached and the plurality of sets of molds are sequentially attached set by set.

Abstract: A molding injection pressure Pi with which a parting opening Lm is formed between a movable mold 2m and a fixed mold 2c during injection-filling and which allows formation of a good molded article is obtained and set in advance. A molding clamping force Pc that allows formation of a good molded article is obtained and set in advance. During production, a mold clamping device Mc is clamped with the molding clamping force Pc, and an injection device Mi to apply the molding injection pressure Pi as a limit pressure Ps is driven to injection-fill a mold 2 with resin R. A parting opening detector 3 that detects the parting opening Lm is provided. During production, reset control is executed to reset the parting opening detector 3 to zero if reset timing tr set in advance has come at least on condition that given preparation for injection is completed after clamping. The reset timing is set in a range covering a given period Zs before injection start time and the given period Zs after the injection start time.

Abstract: An injection molding apparatus has at least two mold clamping mechanisms for clamping respective molds. A hydraulic pressure supply source supplies hydraulic pressure to the at least two mold clamping mechanisms to clamp the respective molds. A a hydraulic-pressure-supply-destination selection section is configured to allow hydraulic pressure from the hydraulic pressure supply source to be selectively supplied to any one of the two mold clamping mechanisms. At least two injecting machines are configured to inject resin material to the respective molds clamped by the respective two mold clamping mechanisms. A non-hydraulic power supply source drives the at least two injecting machines to inject the resin material.

Abstract: An injection molding machine includes a molding machine controller having a computer function to perform molding by controlling a mold clamping device that clamps a mold and an injection device that injects and charges resin, plasticized and molten by rotation of a screw inside a heating cylinder, into the mold by advancement of the screw. The molding machine controller includes a mode selecting function that selects either of two modes of an injection side setting priority mode for injecting and charging the resin by giving priority to a molding condition set on the injection device side and a mold clamping side setting priority mode for injecting and charging the resin by giving priority to a molding condition set on the mold clamping device side. A setting screen display function for displaying an injection side priority setting screen and displaying a mold clamping side priority setting screen is provided.

Abstract: In a liquid resin molding apparatus including a mold, an injection machine, a metering/supplying mechanism for metering a liquid resin material and supplying a metered amount of liquid resin material to the injection machine, and a pump for pressure-feeding the liquid resin material to the metering/supplying mechanism, the pump is a piston pump having a piston and an actuator for reciprocating the piston, and a discharge pressure of the piston pump is set to be at least 1.5 times a supply pressure with which the liquid resin material is supplied to the metering/supplying mechanism. A pressure reducing valve is disposed in a supply path extending from the piston pump to the metering/supplying mechanism, so as to reduce a pressure of the liquid resin material from the discharge pressure to the supply pressure.

Abstract: A liquid resin molding system has a stationary platen and a movable platen mounted for undergoing movement relative to the stationary platen. A mold has at least one cavity and includes a first mold member attached to the movable platen and a second mold member attached to the stationary platen. An injection nozzle is attached to the movable platen and is configured to receive a liquid resin and to inject the liquid resin into the mold cavity. A nozzle touch mechanism is attached to the movable platen for pressing the injection nozzle against the mold.

Abstract: There are provided with rotary encoders 7a and 7b, each detecting a rotation position of each of rotation driving portions 4a and 4b, deviation calculating means 8 that obtains a deviation Ke between an encoder output value Da outputted from one specific rotary encoder 7a and an encoder output value Db outputted from the other rotary encoder 7b, abnormality determining means 9 that compares the deviation Ke with threshold values Ksf and Kss set in advance and determines that the deviation Ke has become the threshold value Ksf or more and/or the threshold value Kss or more, and abnormality output means 10 that outputs at least a determination result of the abnormality determining means 9.