Abstract: The purpose of the invention is to prevent a sticking of lubricant to a ball screw shaft and a scattering to the circumstance in an electromotive toggle mold clamping device. This invention relates to the electric motor driven toggle mold clamping device wherein a ball nut member is screwed together to the ball screw shaft which rotates by an electric motor to advance and retreat freely and a cross head is fixed to the ball nut member, a cylindrical or polygonal cylindrical member which has a cylindrical body shape or square cylindrical body shape with a length and a size of placing the ball screw shaft with a required gap while retreating the cross head, is attached to the front ends of the cross head concentrically with the ball screw shaft. The ball screw shaft protruding from the cross head is placed in the cylindrical or polygonal cylindrical member having a required gap.

Abstract: A device for carrying out a two-stage, linear movement as well as an associated method for displacing a displaceable structural unit relative to a stationary structural unit. A first drive unit drives a shaft, which is in operative connection with a tube, which is connected to the displaceable structural unit. If a predeterminable condition is substantially achieved, a switch is made from the first drive unit to a second drive unit.

Abstract: A clamping apparatus includes upper and lower platens; one or more tiebars connecting the platens; and an intermediate platen between the upper and lower platens for movement relative to and along the tiebars. Upper and lower mold halves are provided on the upper and intermediate platens, respectively. A linkage connects the lower and intermediate platens. The linkage includes upper and lower links connected with each other for rotation on an intermediate shaft. The upper and lower links are pivotably supported on first and second shafts fixed to the intermediate and lower platens, repectively. The intermediate shaft is operatively connected with a drive mechanism so that the drive mechanism transmits a driving force to the linkage, and the lower platen is moved relative to the intermediate platen. A set of a radical needle bearing and a thrust bearing is used for at least one of the intermediate, first, and second shafts.

Abstract: The invention pertains to a closing device in the form of an injection-molding machine for plastics with a stationary mold clamping plate and a movable mold clamping plate, which can be operated by a linear motor. At least one linear motor (41, 42) is connected to a force transmission element (21, 22) which is connected to a lever mechanism (31-33).

Abstract: The novel solution provides a closing part comprising an electromechanical drive for a CD injection molding machine having a working stroke and a servicing stroke. The entire mold closing unit is characterized by the combination of a short-stroke crank mechanism which is operated by an electric motor and which is provided for the working stroke and of a central electromotive column-type nut drive for the servicing stroke. According to the invention, synchronous motors or asynchronous motors are used with corresponding servo boosters to realize servo axles. The central column drive is used as a control element of the closing force control, together with a force sensor for detecting the closing force, as an actual value transmitter and as a control device.

Abstract: The mold clamp apparatus comprises a toggle mechanism provided with a hollow pressure support body at the link tip. A movable platen is provided oppositely to a fixed platen and is supported by inserting therethrough a tie bar across a link reception platen of the toggle mechanism and the fixed platen of the toggle mechanism. A clamping rod enters and exits a pressure support body at the back center of the movable platen. A quick traverse mechanism of the movable platen is provided. A clamping linkage apparatus is arranged between the movable platen and the toggle mechanism by inserting the tie bar through the installation platen. A linkage plate having a tilting pin of the installation platen inserted therein is attached to the pressure support body together with a casing.

Abstract: A clamping mechanism of a molding machine, including a bed; a stationary platen mounted on the bed, and carrying a stationary mold; a guide bar arranged fixedly relative to the stationary platen, and defining a longitudinal guiding axis; a first movable platen arranged movably relative to the stationary platen along the guiding axis, and carrying a movable mold; a support structure interposed between the guide bar and the first movable platen, and movably supporting the first movable platen on the guide bar along the guiding axis; a second movable platen separate from the first movable platen, and arranged movably relative to the stationary platen along the guiding axis; a connecting member connecting the first movable platen and the second movable platen to each other; and a drive section for applying a drive force to the second movable platen, to move the first movable platen and the second movable platen along the guiding axis.

Abstract: A clamping unit for use in an injection molding machine is proposed, wherein a plurality of tie bars are symmetrically positioned and mounted in parallel to corners of a front platen and a rear platen, and a movable platen is movably sleeved about the tie bars and positioned between the front and rear platens. A servo-motor mounted on the rear platen acts as a power source for operating the clamping unit. A belt-gear mechanism associated with the servo-motor transmits torque force and turning speed provided from the servo-motor to a ball screw transmission mechanism connected to the belt-gear mechanism. The ball screw transmission mechanism converts the torque force into axial pushing force, so as to drive a toggle linkage mechanism that interconnects the rear platen and the movable platen, and move the movable platen along the tie bars for performing mold-opening and mold-clamping operations.

Abstract: A cross head position corresponding to a movable mold position set by a movable mold position setting unit is read out from a correspondence table, the position of the cross head is controlled by a cross head position controlling unit via a servo-motor, and the position of the cross head is converted into a position of the movable mold, whereby target position setting of the movable mold is achieved.

Abstract: An ejector device (200) for ejecting articles for injection molding machines for plastic materials comprising a movable mold-holding plate (13) supporting a mold half (20) defining a profile whereon a molded article (21) is formed, and moved by a double toggle mechanism comprising connecting rods (18) connected to the movable mold-holding plate (13); the device (200) for ejecting articles comprising a movable ejector plate (3) supported in translation by means of supporting columns (4) fixed to the movable mold-holding plate (13), and a pin (2) connected to the movable ejector plate (3) and acting on an ejector table (1) arranged into a mold half cavity (51) to favor ejection of the molded article (21), the movable ejector plate (3) being moved by means of lever mechanism driven by a ball screw (35) actuated by an electric motor (40).

Abstract: A closing unit for an injection molding machine for processing plastic material includes a fixed mold mounting plate connected to a moveable mold mounting plate by means of a crank or toggle lever mechanism, which is operated by at least two motor-driven spindles arranged in series and having thread pitches in an opposite manner. One spindle is operatively connected to the fixed mounting plate, whereas the other spindle is connected to the crank or toggle lever mechanism. A sleeve-like force transmission element is arranged concentrically in relation to the spindles. Spindle nuts are respectively provided on opposite end faces of the force transmission element and interact with the power transmission element and the spindles.

Abstract: A die clamping apparatus including a movable plate which is in connection with a pushing-out pin which is projected from and retracted to a moving die and which is held movably with respect to a moving die plate, a clamp member for obtaining a constraint of the movable member, an air cylinder and a hook member. Only a movement of the movable member is constraint by the air cylinder with respect to the moving die plate when the latter is moved in a die opening direction from a die opening limit position, so that a resultant relative movement between the movable plate and the moving die plate, which causes the pushing-out pin to be projected from the moving die, resulting in a removal of a molded product, while the constraint of the movable member prevents the moving die plate from being moved in the die closing direction when the moving die plate in the die opening limit position is under non clamping condition.

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: An apparatus for molding and a molding method utilizing a moveable mold platen which may hold, have affixed to, or carry a first portion of a mold or molds. A second or door platen may hold, have affixed to, or carry a second portion of a mold or molds. The door platen is placed in its closed position, and the moveable mold platen is brought up adjacent to it, so that the two portions of the mold are brought into engagement with one another. A desired molding material is injected into the mold cavity, after which the moveable platen is retracted, the door platen is opened, and the part is removed. A part to be encapsulated may be placed into the mold before the two portions of the mold are brought into engagement.

Abstract: A ball spline nut is provided in each of tie bar penetrating holes formed in a moving platen constituting a mold clamping mechanism of an injection molding machine. On the other hand, a portion of a tie bar one end of which is fixed to a stationary platen, engaging with the tie bar penetrating hole in the moving platen, is made a ball spline shaft. Since there is no clearance between the ball spline shaft and the ball spline nut engaging therewith, in mold clamping and mold releasing processes, the posture of a movable mold attached to the moving platen with respect to a stationary mold attached to the stationary platen is always kept constant.

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: A stationary platen and link housing are coupled through tie bars and feed screw mechanisms are provided at connection areas between the tie bars and the link housing. A geared motor is mounted on a lower side of the link housing and a first spur gear is mounted at a back side of the link housing. A drive shaft of the geared motor and shaft of the first spur gear are connected through a combination of sprockets and chain. A ring gear is mounted at a center of the back face of the link housing and the first gear is engaged with the ring gear. Each second spur gear is fixed to a back face of a corresponding nut of the feed screw mechanism and connected through a corresponding idle gear to the ring gear.

Abstract: Injection molding machines must be provided with devices which ensure that the mold mounting plates when in open position cannot inadvertently close, wherein the conventional safety devices include a toothed locking bar disposed between two mold mounting plates and are provided with a ratchet mechanism, but which obstructs accessibility in the space between the two mold mounting plates, so that according with the present invention a blocking unit is disposed outside the space between two mold mounting plates for engagement of the drive unit of the closing unit to thereby prevent an inadvertent closure.

Abstract: A drive unit (21) is actuated to rotate a ball screw (20). Then, a ball nut (19) included in the ball screw and a cross bead (18) advance toward a movable platen (16) to extend a toggle link mechanism (17) gradually. Consequently, the movable platen (16) advances along tie bars (14), a movable platen support member (24) attached to the movable platen (16) moves on a base frame (11) and a movable mold (22) is brought into contact with a stationary mold (23). When the mold consisting of the movable mold (22) and the stationary mold (23) is thus clamped, a part of the frame provided with a recess (27) of the movable platen support member (24) is deformed elastically to permit the deformation of the movable platen (16) and movable mold (22). Thus the movable platen (16) is not restrained from deformation, clamping force can be uniformly applied to the mold and accurate moldings can be molded.

Abstract: A die clamping apparatus capable of correctly adjusting a die clamping force without direct detection of amounts of deformation of tie bars, having a fixed die plate, a movable die plate, a link housing, a toggle mechanism provided between the movable die plate and the link housing, a position adjustment unit provided between the link housing and the tie bars and connecting the link housing and the tie bars, a link housing position detection unit for detecting a first position of the link housing in a state where the movable die moves from a predetermined die open position to a die closing direction and a die clamping force has not been generated, and a second position of the link housing in a state where the clamping is completed, a die clamping force calculation unit for calculating the die clamping force based on the first and second positions, and a die clamping force adjustment unit for calculating an amount of compensation for compensating the position of the link housing so that the die clamping force

Abstract: A mold clamping apparatus of an injection molding machine is equipped with a drive mechanism for opening, closing, and clamping a mold. The drive mechanism includes a first drive mechanism portion including a first drive motor portion and a first ball-screw mechanism portion and advancing and retracting a movable platen in order to effect high-speed mold opening/closing operation; a second drive mechanism portion including a second drive motor portion and a second ball-screw mechanism portion and pressing a pressure platen in order to effect high-pressure mold clamping operation; and a clutch mechanism for connecting the pressure platen to the movable platen in a pressure applicable manner when the movable platen is located at a mold close position. The first drive mechanism portion advances and retracts the movable platen in order to effect high-speed mold opening/closing operation.

Abstract: An mold thickness adjustable range S of a link housing included in a toggle type clamping unit for a thick mold of the greatest allowable thickness and that of the same for a thin mold of the smallest allowable thickness is divided into a plurality of sections. Extra elongations by which tie bars included in the toggle type mold clamping system are to be stretched for desired mold clamping forces are determined beforehand and are assigned to the sections of the mold thickness adjustable range S. One of the sections in which the link housing is positioned when the toggle type mold clamping system is set in a lock-up state in which a movable half mold is in contact with a fixed half mold is specified by a combination of binary signals provided by switches.

Abstract: A clamping unit for use in an injection molding machine is proposed, wherein a plurality of tie bars are symmetrically positioned and mounted in parallel to corners of a front platen and a rear platen, and a movable platen is movably sleeved about the tie bars and positioned between the front and rear platens. A servo-motor mounted on the rear platen acts as a power source for operating the clamping unit. A belt-gear mechanism associated with the servo-motor transmits torque force and turning speed provided from the servo-motor to a ball screw transmission mechanism connected to the belt-gear mechanism. The ball screw transmission mechanism converts the torque force into axial pushing force, so as to drive a toggle linkage mechanism that interconnects the rear platen and the movable platen, and move the movable platen along the tie bars for performing mold-opening and mold-clamping operations.

Abstract: A clamping apparatus includes upper and lower platens; one or more tiebars for connecting the platens; an intermediate platen provided between the upper and lower platens for movement relative to and along the tiebars. Upper and lower mold halves are provided on the upper and intermediate platens, respectively. A linkage is provided for connecting the lower and intermediate platens. The linkage includes upper and lower links connected with each other for rotation on an intermediate shaft. The upper and lower links are pivotably supported on first and second shafts fixed on the intermediate and lower platens, respectively. The intermediate shaft is operatively connected with the drive mechanism so that the mechanism transmits a driving force to the linkage, so that the lower platen is moved relative to the intermediate platen. A set of radial needle bearing and thrust bearing is used for at least one of the intermediate, first and second shafts.

Abstract: A mold clamping apparatus for an injection molding machine comprises a stationary platen fixedly holding the stationary mold, a movable platen fixedly holding the movable mold and disposed opposite to the stationary platen, tie bars for guiding the movable platen for movement toward and away from the stationary platen, a movable platen driving mechanism for moving the movable platen along the tie bars to close and open the mold, a movable platen fixing mechanism for fixing the movable platen to the tie bars at a set position immediately before a position where the movable mold is joined to the stationary mold, and a clamping force applying mechanism that includes a sealed hydraulic cylinder actuator capable of converting energy of a hydraulic fluid into an intensified mold clamping force and of applying the intensified mold clamping force to the stationary platen.

Abstract: A mold-thickness adjustment mechanism is provided which uses intermediate toothed wheels engaging with a pair of toothed wheels on a tie-bar side. The mechanism includes a toothed wheel on an outer surface of a pressure-receiving plate and toothed wheels with a large diameter for mold-thickness adjustment provided together with a toothed wheel-driving motor on the side of the pressure-receiving plate on the central portion of an outer surface of the pressure-receiving plate. Intermediate toothed wheels are arranged between the toothed wheels with the large diameter and a pair of toothed wheels of one side of the pressure-receiving plate to engage each other. A pair of the toothed wheels is designed to rotate by rotation of the intermediate toothed wheels at the same time, whereby a diameter of the toothed wheel with the large diameter is constituted approximately equally to the breadth of the plate body of the pressure-receiving plate.

Abstract: A mold closing unit for an injection molding machine or press; includes a drive mechanism, and a toggle mechanism having a first pair of linkages which are connected to one another at a first knuckle point. One linkage is connected to a stationary component at a second knuckle point and the other linkage is connected to a movable mold mounting plate at a third knuckle point. At least one of the linkages is operatively connected to the drive mechanism at a fourth knuckle point, wherein the fourth knuckle point is spaced from the first knuckle point by a first distance, and spaced from the second knuckle point by a second distance, wherein a sum of the first and second distances is greater than 1.2 times a distance between the first and second knuckle points.

Abstract: A mold locking device for a molding machine has a toggle assembly, and a transmission member. The toggle assembly has first toggle arms pivoted to a bearing disc of the molding machine, connecting arms pivoted to a movable mold base, second arms pivoted to both the first arms and the connecting arms, and has third arms pivoted to both the second arms and a co-moving disc movable between the bearing disc and the movable mold base. The transmission member has a power source, a connecting member and an elongated screw. The connecting member connects the power source and a nut turnably fitted on the co-moving disc; the screw is passed through the nut for permitting the nut to turn relative to, and move along, the screw. The screw is further connected to the movable mold base such that the movable mold base can be moved between a mold opening position and a closing position by the toggle assembly and the power source.

Abstract: The invention relates to an injection molding machine having a plurality of modular drive groups which are arranged on the injection molding side and on the mold closure side. According to the invention, at least one of the drive groups is connected to the injection molding machine via at least one multifunction element which, as an interface, makes it possible to optionally connect different types of drives, e.g., electromechanical drives, hydraulic drives, pneumatic drives, linear motors or electromagnetic drives as a drive group in an otherwise unmodified injection molding machine. Independent of the respective drive, space for the respectively used drive groups is provided on the injection molding machine in order to accommodate each type of drive. As a result, the structural requirements for an increased modularity are accomplished by using components which, to a great extent, are identical.

Abstract: A closing unit for an injection molding machine for processing plastic material includes a fixed mold mounting plate connected to a moveable mold mounting plate by means of a crank or toggle lever mechanism, which is operated by at least two motor-driven spindles arranged in series and having thread pitches in an opposite manner. One spindle is operatively connected to the fixed mounting plate, whereas the other spindle is connected to the crank or toggle lever mechanism. A sleeve-like force transmission element is arranged concentrically in relation to the spindles. Spindle nuts are respectively provided on opposite end faces of the force transmission element and interact with the power transmission element and the spindles.

Abstract: An injection moulding machine with a closing unit with a stationary and a moveable die platen (1, 2) and a closing mechanism for the moveable die platen (2). The closing mechanism includes a pair of toggle levers opposite one another in mirror image, with two levers of unequal length (4, 5, 6, 7), wherein one lever (7) is pivotally connected to the stationary die platen (1) and the second lever (6) to the moveable die platen (2) respectively. Further, a drive mechanism is provided for the pairs of toggle levers (4, 5, 6, 7).

Abstract: A clamping apparatus of an injection molding machine includes a servo motor installed at the center of the rear platen and two timing belts to drive two ball screws so as to push a five point inwardly bending toggle mechanism to open the mold, close the mold and mold clamping. Moreover, a servo motor is fixed to the lateral side of the movable platen to drive the nuts of the screw to rotate so as to push the ball screw, ejector rod and ejector plate to move linearly for achieving the object of ejecting. An electromotive motor on the rear platen will drive the mold adjusting means. By the assisting of the servo motor on the rear platen, the function and object of automatic mold adjusting can be achieved rapidly.

Abstract: A molding die drive unit capable of both of compressing and expanding (volume enlargement) molten resin in molding die and having thin shape and superior mechanical efficiency, molding unit and molding process are provided. A molding die drive unit 20 for advancing and retracting a movable die 10B relative to a cavity 10C has a large-diameter main cylinder unit 21, and a plurality of small-diameter sub cylinder unit 22 disposed around the main cylinder unit 21. After loading the molten resin, the cylinder units 21 and 22 are driven to advance and retract the movable die 10B to the cavity 10C to compress or expand the molten resin in the cavity to conduct molding process.

Abstract: An apparatus having a movable mold clamping seat for high temperature fluid injection molding includes a barrel supporting seat, a barrel, a injecting nozzle, a set of hydraulic cylinders, a static platen, a movable plate and a mold. The barrel supporting seat is jointed to a machine body. The barrel has one end fixed to the barrel supporting seat, and the injecting nozzle is fixed to the other end. The static platen is movable on the machine body. One end of each hydraulic cylinder is fixed to the barrel supporting seat, while the end of is fixed to the static platen. The center lines of the hydraulic cylinders are in the same plane as the center line of the barrel. By pulling the hydraulic cylinder, the injecting nozzle passes through a hole in the static platen to contact a sprue bushing for injecting a high temperature fluid into the mold.

Abstract: Method and apparatus for control of a toggle operated press to effectively set relative position between a fixed platen and a die height platen. The toggle crosshead is placed at a position required to achieve a desired press clamp force. The die height platen is advanced toward the fixed platen until minute motion of the toggle crosshead away from the fixed platen is detected whereat advance of the die height platen is ceased. In the relative position of the die height platen and fixed platen results in contact of the mold sections prior to the crosshead being placed at the required position, the crosshead is retracted a predetermined distance and then advanced to the required position. Desired die height setting is achieved without repeated iterations of a die height setting procedure.

Abstract: A motor-driven mold clamping device includes a toggle mechanism for advancing and retracting a movable platen toward and away from a fixed platen, and a servo motor adapted to drive the toggle mechanism via a ball screw mechanism. The toggle mechanism, the movable platen, and the fixed platen are configured such that a mold clamping force is controlled with a knicking in the toggle mechanism being in a predetermined range such that the servo motor is driven with a current which is controlled to be at or near a rated current therefore, in order to maintain the mold clamping force. A method of controlling mold clamping force includes the steps of providing the toggle mechanism, and the servo motor as discussed above, and controlling the mold clamping force by appropriately configuring the knicking in the toggle mechanism to be in a predetermined range such that the servo motor is driven with a current which is at or near a rated current.

Abstract: The mold clamping device with improved transmission mechanism includes: a middle platen 2 fixedly supported by a support base 1 and carrying the lower metallic mold 6; and front tie-bars 3a extending slidably therethrough. A movable platen 4 carrying the upper metallic mold 7 is secured to the top ends of the front tie-bars 3a. The horizontal connecting bar members 5a and 5b connect the bottom ends of the front and the rear tie-bars 3a and 3b. The middle platen 2 and the horizontal connecting bar members 5a and 5b are operatively coupled by means of the pantograph mechanism consisting of flat bar-shaped links 15a and 15b, whose front and rear joints are pinned to annular links 16a and 16bengaging with a left-and-right-handed ball thread member 17 driven by a driving source.

Abstract: A motor-driven mold clamping device includes a servo motor and a movable platen, with a toggle mechanism driven by the servo motor to advance and retract the movable platen for clamping a mold. The toggle mechanism has a crosshead associated with the movable platen. A setting unit is provided for setting a position of the movable platen, and a position detector is provided for detecting a position of the crosshead. A control unit is provided for approximating a correlation between the position of the crosshead and the position of the movable platen by using at least one mathematical function of a quadratic or higher order. The control unit calculates a calculated position of the crosshead by the at least one mathematical function with the position of the movable platen set by using the setting unit to control the position of the crosshead for the control of the mold opening and mold closing positions.

Abstract: A mold locking device for a molding machine has a toggle assembly, and a transmission member. The toggle assembly has first toggle arms pivoted to a bearing disc of the molding machine, connecting arms pivoted to a movable mold base, second arms pivoted to both the first arms and the connecting arms, and has third arms pivoted to both the second arms and a co-moving disc movable between the bearing disc and the movable mold base. The transmission member has a power, a connecting member and an elongated screw. The connecting member connects the power and a nut turnably fitted on the co-moving disc; the screw is passed through the nut for permitting the nut to turn relative to, and move along, the screw. The screw is further connected to the movable mold base such that the movable mold base can be moved between a mold opening position and a closing position by the toggle assembly and the power.

Abstract: A drive unit (21) is actuated to rotate a ball screw (20). Then, a ball nut (19) included in the ball screw and a cross bead (18) advance toward a movable platen (16) to extend a toggle link mechanism (17) gradually. Consequently, the movable platen (16) advances along tie bars (14), a movable platen support member (24) attached to the movable platen (16) moves on a base frame (11) and a movable mold (22) is brought into contact with a stationary mold (23). When the mold consisting of the movable mold (22) and the stationary mold (23) is thus clamped, a part of the frame provided with a recess (27) of the movable platen support member (24) is deformed elastically to permit the deformation of the movable platen (16) and movable mold (22). Thus the movable platen (16) is not restrained from deformation, clamping force can be uniformly applied to the mold and accurate moldings can be molded.

Abstract: An arm structure for an injecting molding machine includes arms consisting of two pairs of two arms respectively having plural parallel pivotal plates having two ends pivotally connected with plural position plates of a receiving disc and a movable mold base. Each position plate has an outer end concave surface with a threaded hole. Each pivotal plate has an outer end is bored with a pivot hole and fits in a gap between every two position plates. Further, a tubular pivot has plural through holes spaced apart corresponding to the threaded holes of said outer end concave surfaces of the position plates for bolts to pass through and screw with the threaded holes. Then the arm structure is pivotally connected to the receiving disc and the movable mold base. Therefore, the arm structure is easily assembled with or disassembled from the receiving disc and the movable mold base by only screwing off the bolts, without need of removing the connecting rods.

Abstract: A mold clamping apparatusm for an injection molding machine comprises a stationary platen fixedly holding the stationary mold, a movable platen fixedly holding the movable mold and disposed opposite to the stationary platen, tie bars for guiding the movable platen for movement toward and away from the stationary platen, a movable platen driving means for moving the movable platen along the tie bars to close and open the mold, a movable platen fixing means for fixing the movable platen to the tie bars at a set position immediately before a position where the movable mold is joined to the stationary mold, and a clamping force applying means comprising sealed hydraulic cylinder actuators capable of converting energy of a hydraulic fluid into an intensified mold clamping force and of applying the intensified mold clamping force to the stationary platens.

Abstract: A vertical adjustment device for a mold closing unit of a hot chamber die-casting machine is provided with a shear mechanism. An electrical servomotor is provided as a drive assembly for spreading the shear mechanism apart, with the axis of the servomotor being parallel to the guide surface for the shear mechanism and driving, through an angle transmission, a spindle oriented at less than 90° with respect to the drive axis of the servomotor. One end of each of the two lever pairs of the shear mechanism is connected pivotably with the closing unit or with the machine frame. The other ends are supported on the guide surface and the machine frame and on a guide surface of the closing unit.

Abstract: A die clamping apparatus capable of correctly adjusting a die clamping force without direct detection of amounts of deformation of tie bars, having a fixed die plate, a movable die plate, a link housing, a toggle mechanism provided between the movable die plate and the link housing, a position adjustment unit provided between the link housing and the tie bars and connecting the link housing and the tie bars, a link housing position detection unit for detecting a first position of the link housing in a state where the movable die moves from a predetermined die open position to a die closing direction and a die clamping force has not been generated, and a second position of the link housing in a state where the clamping is completed, a die clamping force calculation unit for calculating the die clamping force based on the first and second positions, and a die clamping force adjustment unit for calculating an amount of compensation for compensating the position of the link housing so that the die clamping force

Abstract: Disclosed is a high pressure injection molding system employing one or more plastic injection molding workstations including split molds, a single plastic extruder coupled to a heated manifold capable of delivering fluid plastic to multiple workstations, and wherein final lockup of the split mold halves results in application of compressive forces effective to maintain the split mold halves in nominal position during high pressure injection molding conditions. Operational movement is performed by use of a single remote pumping station utilizing pressure compensated pumps, accumulators and manifolds. The independent mold workstations allow independent operation while providing efficency of operation for the hydraulic system and extruder system.

Abstract: Double toggle mechanism for moving the moveable die platen (2) of an injection moulding machine, with a first operating lever (7a) for extending and moving the first toggle mechanism (3a), and with a second operating lever (7b) for extending and bending the second toggle mechanism (3b). In accordance with the invention, it is provided that between the two toggle mechanisms (3a, 3b) there is arranged a gear mechanism with a rotatably mounted gearbox (8), with a drive shaft (11) driven by a motor (12), and with a driven out-put shaft (9) arranged coaxially to the drive shaft, in that the first operating lever (7a) is connected in an articulated manner to the gearbox (8) or a part attached thereto, and in that the second operating lever (7b) is connected in an articulated manner to a part (10) fixed rigidly onto the driven out-put shaft (9).

Abstract: A threaded shaft (52) for operating toggle joint (44) is driven for rotation by a first servomotor (46). A bevel gear (56) is mounted on the threaded shaft (52) for rotation relative to the threaded shaft (52). The bevel gear (56) is driven for rotation by a second servomotor (57). Bevel gears (60) each having a threaded bore are supported on a rear plate (42) are engaged with threaded sections (40A) of tie bars (40), respectively. Power is transmitted from the bevel gear (56) through power transmitting mechanisms (61) to the bevel gears (60). Each power transmitting mechanism (61) comprises bevel gears (62, 63) engaged with the bevel gears (56, 60), respectively, and a clutch (64) interposed between the bevel gears (62, 63). The clutches (64) are engaged and disengaged selectively to adjust the parallelism of a movable mold (36) with respect to a stationary mold (32).

Abstract: Principal parts of an injection molding machine (1) are formed by joining a stationary platen (3), moving platen (4), mold clamping mechanism section (7), and rear platen (5) in the order named, the stationary platen (3) and the rear platen (5) are connected by means of tie bars (2), and the moving platen (4) is actuated by means of the mold clamping mechanism section (7) that is provided between the rear platen (5) and the moving platen (4). Guide rods (9) are arranged protruding from that surface of the moving platen (4) which is opposite from the surface on which a stationary-side is mounted, whereby a crosshead (10) is guided in sliding motion. Further, the guide rods (9) are caused to penetrate and project from the rear platen (5), and an injection unit (8) is fixed to their respective distal ends. A slide guide for the crosshead (10) and a support guide for the injection unit (8) are formed integrally with each other, whereby the number of components used and the manufacturing cost are reduced.

Abstract: A clamping unit and method thereof, in which a servo-motor mounted on a rear platen is used for driving two ball screws with pre-load hydraulic cylinders so as to acuate the outward-bending toggle mechanism to provide mold-opening and mold-clamping functions; by using a limited space, a servo-motor mounted on the movable platen is used for driving a nut to turn so as to cause the screw and the ejector bar to be moved back and forth; finally, an electric motor on the rear, platen will drive a mold-adjusting mechanism, and a servo-motor mounted on the platen is also operated so as to complete the mold adjustment quickly and automatically.

Abstract: The device for the closure of dies is provided with a system of levers (10), (11), (17) and (18) forming a double toggle joint each with seven pivot points and a mobile intermediate plate (14). The device permits a substantial increase in the course of the mobile plate while maintaining unchanged the connections of the connecting rods and permits achievement of a greater length of the useful course of the mobile plate while maintaining parity with the prior art in the space occupied by the course, also a reduction of the thrust forces to which the components of the device are subjected as well as a lower production cost under equal production conditions.