Abstract: A method of moulding a plastics material in a mould cavity is described which relies primarily on movement of a part of the mould to provide the pressure necessary to force the plastics material melt to fill all the parts of the mould cavity.

Abstract: A method for the injection moulding of a plastic article, such as CD or a DVD, comprises the following steps: the provision of a mould (1) having at least two mould parts (2, 3), the provision of positioning elements (9, 22) for positioning the mould parts (2, 3) with respect to one another in a nominal mutual spacing such that a mould cavity (6) is obtained, injecting a fluid material into the mould cavity (6) under pressure, influencing the positioning elements (9, 22) in such a way that the nominal distance between the mould parts (2, 3) is maintained when injecting the material (26) into the mould cavity (6) under pressure.

Abstract: A molding machine includes a mold space between two mold carriers. One of the two mold carriers is movable relative to the other by a drive. A separate power unit generates a predetermined closing force between the two mold carriers when the two mold carriers are moved together. The separate power unit comprises, for its actuation, a pressure cushion filled with a composition that is highly viscous by comparison with hydraulic oil.

Abstract: A method of injection-moulding includes separating an injection nozzle from a mould during every moulding cycle. An apparatus for carrying out the method is also disclosed.

Abstract: Molding apparatus (200) is provided for simultaneously molding a molding material around a number of separate substrates, each substrate having a semiconductor chip mounted thereon. The apparatus includes a mold holder (113a, 113b, 114, 103) having a first holding section for holding a first mold half (119) and a second holding section for holding a second mold half (120). The first and second holding sections have a common support surface (135), the support surface (135) including a first movable member (104a) in the first holding section and a second movable member (104b) in the second holding section. The first and second movable members (104a, 104b) are movable between a first position in which they protrude out of the support surface (135) and a second position in which the protrusion from the support surface (135) is less than in the first position.

Abstract: An actuator for a press comprises a piston disposed through a small bore diameter high speed actuating cylinder, having a piston head disposed within the actuating cylinder and another piston head disposed within a larger bore diameter hydraulic clamping cylinder to apply the required clamping force to the press.

Abstract: A mold clamping apparatus of an injection molding machine includes a drive mechanism. The drive mechanism includes a first drive mechanism for opening/closing a mold at high speed through advancement/retreat of a movable platen effected by means of a first drive motor unit and a first ball screw mechanism; a second drive mechanism for clamping the mold at high pressure through application of pressure to a pressing member effected by means of a second drive motor unit and a second ball screw mechanism; an engagement mechanism for engaging the movable platen with the pressing member in the course of advancement of the movable platen; and a clutch mechanism which is operated after establishment of the engagement effected by the engagement mechanism, in order to interlock the pressing member with the movable platen to thereby enable the pressing member to apply pressure to the movable platen.

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 clamping apparatus for an injection molding machine includes 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 including 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: The invention relates to a novel method for producing precision parts, especially flat optical data carriers. According to the invention method, the embossing procedure is program-controlled on the basis of the path function of an electromechanical or hydraulic drive of the driven mold half. When a servomotor is used, the internal path signal thereof can be directly used for calculating the path function or for operating the program control. The novel method allows for a complete speed control of the embossing phase. All factors that can be mechanically influenced from the exterior are detected in more detail for the conditions before and during the embossing phase, thereby allowing for an optimum precision and reproducibility.

Abstract: An injection molding machine having four tie bars extending through and between a movable platen and a fixed platen each of which carry a half of a mold. To enable the movable platen to withstand the forces which arise during a molding process, a pressure control mechanism including a piston in association with each tie bar is received within a corresponding recess provided in the movable platen and in order to grip the tie bars during the molding process a gripping mechanism is provided which is supported by the piston such that the gripping mechanism and the piston effectively form a single movable unit. The gripping mechanism comprises a pair of gripping jaws which are transversely movable and are moved by way of a rotatable disc which is also provided in the single movable unit.

Abstract: A stationary platen (14) and a movable platen (18), which are connected with each other by tie rods (28), to which metallic molds are respectively attached, are opened and closed by an electrically driven ball screw mechanism. The movable platen is composed of a platen body and a pressure plate (304) attached to the platen body which can be contacted with and separated from the platen body. Between the movable platen and the pressure plate, clamping is conducted by the expansion and contraction of a bladder (318) into which hydraulic oil for clamping can be introduced. The bladder houses an insert die (320), the shape of which is identical with an internal shape of the bladder, and a hydraulic oil path is formed in the insert die. While a ball screw member (102) of an electrically driven ball screw mechanism is being supported being capable of moving in the axial direction, a brake means (130) for restricting rotation is provided, and a mold releasing cylinder mechanism (116) is connected.

Abstract: A mold clamping unit employed in an injection molding apparatus for opening and closing a mold having a movable mold plate and a fixed mold plate. The mold clamping unit comprises a mold clamping cylinder, mold opening means for applying a mold opening force of a predetermined magnitude to the movable mold plate in the direction from the closed position to the fully open position and moving the movable mold plate from the closed position to the predetermined half-open position located between the closed position and fully open position, and switching means for switching the mold clamping force generated by the mold clamping cylinder between the first mold clamping force which is larger than the mold opening force and a second mold clamping force which is smaller than the mold opening force by switching the supply pressure of working fluid supplied to the mold clamping cylinder.

Abstract: The invention relates to a mold closure unit for an injection molding machine comprising a first device provided for moving the moveable mold support on the stationary mold support in a direction to and from said stationary mold support. By connecting a second device, the first device comes in contact with its rotatable element and is decoupled from the induction flux. Additional inductions produced by the second device are transmitted to the moveable mold support via a force transmission element which is in the form of a pressure pipe. A switching chamber designed as a decoupling means which can be actuated by a hydraulic medium is arranged between the force transmission element and the supporting element, whereby, similar to the second device, the pressure in the switching chamber can be switched in any manner. As a result, a switchable transition between the first device and the second device is obtained.

Abstract: Mold clamping apparatus is disclosed which includes: an electrically-operated movable-platen-driving device of ball-screw type having a first ball-screw shaft supported by one of a movable and a rear platens, a first ball-nut threaded-engaged with the first ball-screw shaft and supported by the other of the movable and rear platens, and a movable-platen driving device for rotating the first ball-screw shaft and nut relative to each other so as to generate a relative longitudinal motion of the first ball-screw shaft and nut so that said movable platen is moved toward and away from a stationary platen to close and open the mold; a pressure-generating cylinder device having a pressure-generating piston moved by the relative longitudinal motion of the first ball-screw shaft and nut in order to generate a hydraulic pressure; and a mold clamping cylinder device adapted to generate a mold clamping force based on the hydraulic pressure applied from the pressure-generating cylinder device; and an engaging device which

Abstract: In an injection molding machine, rapid movement over long distances is carried out with the aid of conventional means, as is the action of locking in the working position. The novel feature is, then, that in order to hold counter to the flow front of the injected material, piezoelectric actuators (P11 to Pnn) are used.

Abstract: A mold clamping apparatus in which hydraulic oil that is forcibly discharged into hydraulic lines from one of two kinds of cylinders, that is, a differential mold clamping cylinder and a mold clamping oil chamber of a mold opening/closing cylinder, is, in an alternating manner, provided to the other cylinder as its operating oil. This feature enables the simultaneous operation of the two kinds of cylinders as well as reduction in operating time in which the mold is opened or closed. The mold clamping apparatus includes a stationary mold, a movable mold which closes with respect to the stationary mold, a core movable through the movable mold into and out of the stationary mold. The movement of the core into and out of the stationary mold is effected by a differential mold clamping cylinder which is separate from a mold opening/closing cylinder for the movable mold and is fitted with a booster ram.

Abstract: A mold clamping apparatus for an injection molding machine including 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 moveable platen driving element for moving the movable platen elements for fixing the movable platen to the tire bars at a set position immediately before a position where the movable mold is joined to the stationary mold, and a clamping force applying element including 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 platen.

Abstract: The mold press includes a drive arrangement for controlling press movement and closure force. The drive arrangement includes a pair of generally identical drive units connected between upper and lower press plates adjacent opposite longitudinal ends of the press. The drive units in a preferred embodiment each employ a ball-screw drive arrangement. The screw shaft extends vertically between the top and bottom press plates. The screw shaft engages a ball nut mounted on one press plate, typically the bottom press plate which is disposed for movement toward and away from the top press plate. A first high speed drive arrangement employing a first electric motor is coupled to the screw shafts for effecting high speed opening and closing of the bottom press plate.

Abstract: An integrated circuit encapsulation apparatus comprises a molding press, which has a mold defining a cavity adapted to receive an integrated circuit die and an attached leadframe for encapsulation thereof. The molding press is operable by an electro-pneumatic driving mechanism which utilises a geared servo motor for opening and closing the mold, and a pneumatic cylinder for providing clamping pressure. Both the servo motor and pneumatic cylinder act upon a threaded screw member for movement of the molding press. The press is provided with an integrated mold brushing unit which has transversely rotating brushes and travels over the mold faces to remove debris. In a further refinement, a spring-loaded bearing system is provided for easy removal of the mold.

Abstract: A locking apparatus secures a movable platen in position relative to strain rods on which the movable platen is slidably carried. The locking apparatus includes split nuts that are carried by the movable platen and are pivotable about respective pivot axes between a first position in which the split nuts engage the strain rods and a second position in which the split nuts are pivoted away from the strain rods. The strain rods include grooved sections and the split nuts carry internal grooved portions that are complementary with the grooved portions of the strain rods so that the split nuts are engageable with the grooved portions of the strain rods to retain the movable platen in a desired position during a molding operation.

Abstract: A clamping assembly for an injection molding apparatus includes a first platen attached to a base and a second platen slidingly associated with the base. A number of tiebars are mechanically linked to each of the platens through a number of mechanical linkages. An actuation system associated with the plurality of tiebars and with at least one of the platens is configured to generate movement of the second platen relative to the first platen. The mechanical linkage between each of the tiebars and at least one of the platens includes a threaded bushing engaged with a threaded portion of the tiebar. The actuation system is configured to generate relative rotation between each of the tiebars and a corresponding one of the threaded bushings.

Abstract: A mold clamping method for a straight hydraulic mold clamping apparatus, wherein supply of mold clamping oil to the rear oil chamber of the mold clamping cylinder starts immediately before completion of slowing down of the mold closing process using rapid-moving cylinders, and raising the mold clamping force successively starts simultaneously with completion of the mold closing.

Abstract: A platen to be operationally coupled to a plurality of tie bars and which is suitable for supporting a mold element in a clamping operation in which the platen is subjected to clamping forces. The platen includes a mold supporting section comprising a mold support member having a mold mounting surface for receiving the mold element. A plurality of tie bar engaging members are spaced apart from the mold supporting section. A flexible interconnecting structure comprises at least one interconnecting element which interconnects at least tie bar engaging member to the mold supporting section. The interconnecting element is placed under tension during the clamping operation to allow the tie bar engaging member to deflect upward relative to the mold supporting section in response to the clamping forces acting against the platen.

Abstract: The present invention relates to stack mold linkages for creating unequal strokes for use in an injection molding machine for making different sized molded parts. The stack mold linkages comprise linkages for moving each of at least two mold assemblies between a mold closed position and a mold open position and for separating the mold halves forming the mold assemblies by unequal stroke lengths.

Abstract: A thermoplastic resin is molded by a press-molding method wherein a thermoplastic resin in a molten state is compressed to flow between a pair of female and male molds so as to be formed into a predetermined shape. A compression rate of the mold is controlled so that the following expression (1) is satisfied:0.5.ltoreq.B/A.ltoreq.2 (1)wherein A (mm/s.sup.2) is an acceleration which is realized at a time when the compression rate is 75% of a maximum rate in a compression-acceleration region, which region is defined as a period of time from a moment when the compression of the molten thermoplastic resin is started to a moment when the compression rate reaches the maximum rate; and B (mm/s.sup.2) is a deceleration which is realized at a time when the compression rate is 75% of the maximum rate in a compression-deceleration region, which region is defined as a period of time from a moment when the compression rate reaches the maximum rate to a moment when the closing of the molds is complete.

Abstract: For the shaping of a microstructure substrate via a mold cavity, an unmolding device allows an abrupt, shear-free separation, in particular at reaction temperature, of the microstructure substrate manufactured using the reaction molding method. Optical waveguide components meeting stringent damping requirements can easily be manufactured with this device.

Abstract: An injection molding apparatus includes stationary and movable die carrier plates. The movable die carrier plate can be moved in a direction toward the stationary die carrier plate during a quick stroke and can be pressed toward the stationary die carrier plate during a power stroke. An electric motor has an output. A member is connected between the output and the movable die carrier plate to transmit movement of the output to the movable die carrier plate to move the movable die carrier plate during the quick stroke. A force setting device is responsive to a force acting between the output and the movable die carrier plate to interrupt transmission of movement of the output to the movable die carrier plate at a changeover between the quick stroke and the power stroke when the force exceeds a predetermined value.

Abstract: A locking apparatus for an upper mold and a lower mold of a press apparatus includes a ball screw, a screw nut, a force producing spanner structure and at least one engagement structure. The screw nut is responsive to a first power source for driving the ball screw in an axial direction to perform a lower-pressure higher-speed stroke. The spanner is responsive to a second power source for producing a force in circumferential direction. The engagement structure is arranged around an external rim of the screw nut. Responsive to the force in the circumferential direction, the engagement structure closely engages with the external rim of the screw nut such that a corresponding friction force is applied to the screw nut. The screw nut, responsive to the friction force, drives the ball screw in the axial direction to perform a higher-pressure stroke to lock the upper mold and lower mold.

Abstract: A control method for an injection molding machine includes deciding a position where the speed of a movable platen is to be changed from high speed to low speed. Over the coasting distance, between high speed (equivalent to V.sub.4) and low speed (equivalent to V.sub.6), the speed changes smoothly past the decided position in accordance with a function of time, F(T)=V.sub.4 -(V.sub.4 -V.sub.6) (1-e.sup.-T). Decreasing speed at a second decided position, just before the movable platen stops, is in accordance with a function of position s, F(s)=s(V.sub.MAX -V.sub.MIN)/D+V.sub.MIN. V.sub.MAX is equivalent to the maximum mold closing or opening speed and V.sub.MIN is equivalent to the minimum speed at which moving of the movable platen is guaranteed.

Abstract: An injection molding machine includes a feedback control system for controlling both the speed and position of a control object, such as a movable platen or an injection screw. The feedback control system includes a driving mechanism connected to the control object and a monitor monitoring the position of the control object. The monitor transmits signals representative of the sensed position of the control object. A speed control system controls the driving mechanism until the control object reaches a threshold position. Thereafter, a position control system controls the driving mechanism. A switch is provided to change the feedback control system from the speed control system to the position control system.

Abstract: A method for injection-molding workpieces in a mold of an injection-molding machine is disclosed. The method provides a means of conducting test cycles during the initial setup of the machine at reduced speed. In a multi-cavity mold all of the workpieces are demolded by means of a handling system having a workpiece carrier system receiving and holding all workpieces in a regular pattern. The workpieces are inspected on the workpiece carrier system for determining whether all of the cavities have been filled with plastic material and whether the workpieces are of a predetermined quality. If this is not the case, the necessary adjustments are made and the test cycle is repeated. If all of the workpieces are of a predetermined quality, the machine is switched to automatic production at high nominal speed.

Abstract: A molding apparatus produces high-density thin type optical disk substrates having good replicability and birefringence sufficient for practical use. In filling the resin into the cavity, the stress on the resin is reduced by controlling the relation of the cavity width and the injection compression force to reduce birefringence. Further, the mirror surface of the mold is maintained at a certain temperature to facilitate the resin flow and a good replicability and reduction of birefringence is achieved by terminating the resin filling and starting the compression process at the time at which the pressure of the resin filling is at a minimum.

Abstract: In a mold closing unit for use in an injection molding machine for processing plastifiable materials comprising a first device for transfering a movable mold carrier and a second device for generating the closing force, the first device is supported at a first supporting element. The second device acts on the first device, the first supporting element and the movable mold carrier. As second device for generating the closing force an eccentric drive or a hydraulic drive unit is provided enabling a process for force control.

Abstract: In a device for fixing a ball screw/nut mechanism, including a ball screw and a ball nut, safe from turning. The ball screw/nut mechanism generates a linear movement to displace a first subassembly until it rests on a second subassembly. A blocking device is provided, which is adapted to fix the rotating part of the ball screw/nut mechanism, when both subassemblies are in contact, safe from turning through a reaction force originated by an external force and by overcoming the force of a first resetting means. When the parts are in contact, the blocking device is positioned in a determined distance from the first subassembly, and when the external force, generated by the drive device, arises the turnable part is safe from turning, until the determined distance between the first subassembly and the blocking device is compensated for.

Abstract: A method and apparatus are provided for producing insert molded articles. The involves the steps of preforming a patterned insert material clamped at end parts thereof by a clamping device into a predetermined shape corresponding to the shape of a cavity formation face of a male die or a female die of an injection molding die by a preforming device, and trimming an unnecessary portion of the preformed material by a trimming device so as not to project from the peripheral edge of the surface of a cubic molded article to be formed of molding resin. The method further involves setting the trimmed material at the cavity formation face of the male or female die of the injection molding die, clamping the male and female dies to form a cavity by the cavity formation faces, injecting molding resin into the cavity, and removing the insert molded article from the injection molding die after the molding resin is cooled and softened.

Abstract: An apparatus for injection molding thermoplastic material has mold halves carried by stationary and movable mold mounting plates which are mounted on a frame. A control mechanism actively applies a variable torque to one of the mold mounting plates for compensating for any bending of the frame due to the closing force applied between the mold halves.

Abstract: A thermoplastic resin is molded by a press-molding method wherein a thermoplastic resin in a molten state is compressed to flow between a pair of female and male molds so as to be formed into a predetermined shape. A compression rate of the mold is controlled so that the following expression (1) is satisfied:0.5.ltorsim.B/A.ltorsim.2 (1)wherein A (mm/s.sup.2) is an acceleration which is realized at a time when the compression rate is 75% of a maximum rate in a compression-acceleration region, which region is defined as a period of time from a moment when the compression of the molten thermoplastic resin is started to a moment when the compression rate reaches the maximum rate; and B (mm/s.sup.2) is a deceleration which is realized at a time when the compression rate is 75% of the maximum rate in a compression-deceleration region, which region is defined as a period of time from a moment when the compression rate reaches the maximum rate to a moment when the closing of the molds is complete.

Abstract: A mold assembly has a fixed mold incorporating a base with a movable member supported thereon so as to be movable relative thereto and which is closed against a movable mold by a spring. A protrusion on the base passing through the movable member, and a recess on the movable mold engage to form a cavity. A runner and a gate are formed between the movable member and movable mold. Resin is filled into the cavity with the mold lightly closed and the movable member and movable mold closed, but with the movable member and base apart. During filing, the movable member and base open under resin pressure which is held constant inside the cavity. The movable member and base are then closed and when the gate closes with engagement of the protruding and recess portions, a constant amount of resin remains in the mold cavity, which is then compressed.

Abstract: A mould closing device for an injection moulding machine includes a fixed (1) and a movable (4) mould clamping plate for support of screw drives (36) which are freely rotatable in the fixed mould clamping plate (1) and axially supported in one direction and supported in spindle nuts (39) secured in the movable mould clamping plate (4). Provided for actuation of the screw drives (36) for the closing and opening stroke of the movable mould clamping plate (4) are a rotary drive (44) and a hydraulic piston-cylinder unit (45, 46) interacting with the screw drives for effecting the closing force build-up.

Abstract: The hydraulic mould closure device for an injection moulding machine has a pressure convertor, whose high pressure piston extends into a passage leading to the pressure side of the closure piston and closes it, when producing the closure pressure. Formed in the low pressure piston is an actuating cylinder into which an actuating piston extends. The actuating piston is connectable to the hydraulic tank and to the hydraulic pump. Adjacent to the low pressure cylinder of the pressure convertor there is a space whose diameter is larger than that of the low pressure cylinder. The actuating piston also has lateral openings which move out of the actuating cylinder as soon as the high pressure piston moves into the high pressure cylinder. The piston element of the pressure convertor is moved very rapidly out of the rest position into its active position so that operation occurs with reduced control times.

Abstract: A mold closing unit for an injection molding device includes a machine frame, a moving mold platen and a fixed mold platen joined by four guide rods at the corners of the plates, with the moving mold platen being moveable along the guide rods via hydraulic cylinders connected thereto and arranged in prolongation of the rod axes, and with the diameters of one pair of piston rods being smaller and with the diameters of another pair of piston rods being greater than the diameter of the identical guide rods so that the contact surfaces of the pistons of each hydraulic cylinder on the opening and the closing sides are of different sizes.

Abstract: A method and apparatus for clamping a plastic injection mold. The apparatus utilizes leader pins connected directly to a pair of mold sections. By directly connecting the leader pins to the mold sections, standard platens and housings can be eliminated, thereby reducing the overall weight and dimensions of the apparatus. An ejection assembly and runner assembly are bolted onto the mold sections, but are not subjected to clamping pressures during the molding process. Since these assemblies are not subject to clamping pressures, the standard housings usually provided on these assemblies may also be eliminated.

Abstract: In order to operate the closing means of a double plate injection moulding machine including a fixed and a movable mould plate, the closing means comprising at least one pump (22), at least one high speed cylinder for a high speed stroke and at least one closing cylinder (10) for a closing stroke with a nominal closing force, whereby the closing cylinder (10) includes a double action piston (7) in which both piston faces (13, 14) are the same size and which divides the interior of the closing cylinder (6) into two cylinder sections (8, 9) which are hydraulically connectable via hydraulic lines (21, 22) and a valve (26), the following method is carried out: during the high speed closing operation using the high speed cylinder (3), both sides of the piston (7) of the closing cylinder (10) are pressurized with an equal, high pressure which is as high as or higher than that required to obtain the required nominal closing force, whereby on moving the piston (7) of the closing cylinder (10) in the closing direction

Abstract: A method for encapsulating semiconductor devices includes the steps of: providing a molding system and a close-loop control system which is coupled to the molding system, the close-loop control system including a computer, a programmable logic control, a servo motor controller, and at least two drivers, wherein the servo motor controller is coupled to the computer and the programmable logic control, respectively, the servo motor controller is further coupled to the drivers, and the drivers are coupled to the molding system; clamping together at least one set of top and bottom molds of the molding system, the molding system including a clamping assembly having a clamping axis, the close-loop control system being coupled to the clamping assembly; feeding a molding compound into a cavity formed by a space between at least one set of top and bottom molds, the molding system further including a transfer assembly having a transfer axis; alternating a gear switching assembly of the molding system between a high spee

Abstract: A mold closing unit for use in an injection molding machine for processing plastifiable materials, including a first device for transferring a movable mold carrier, and a second device for generating the closing force. The first device is supported at a first supporting element. The second device acts on the first device, the first supporting element and the movable mold carrier. The second device for generating the closing force is an eccentric drive or a hydraulic drive units which enables a process for force control.

Abstract: A mechanism for closing a mold in plastic injection-molding machinery that accommodates a large and heavy molding tool (5). One stationary chuck (2) rests machinery's base (1), while another chuck (3) travels on a longitudinally movable carriage (4). Each chuck (2,3) accommodates one half of the mold (5) and is aligned by poles (6) which can extend through the chucks. The carriage has a number of bearing sites (4.4) mounted on its bottom surface proximate to its corners. Suspension crossarms (10.2, 14.2) are rotatably mounted to the bearing sites (4.4). The rear suspension crossarms (10.2, 14.2) are mounted using a shaft (11) which has two eccentric portions (11.1) with opposite eccentricities. The non-eccentric portions (11.2) of the shaft are connected to one another by a torsion rod (12) and are rotatably mounted in the bearing sites (4.4). The rear suspension crossarms (10.2, 14.2) are rotatably mounted on the eccentric portions (11.1) of the shaft (11). Rocking shoes (10.1, 14.

Abstract: An acceleration pressure is used as set value for the movement of the mass which is to be shifted, such as the mold clamping unit in an injection molding machine. For this purpose it is proposed to use preferably an electrically modulated pressure control valve for the pressure regulating device in the pressure drive system. Even with extremely short acceleration periods resonance oscillations are avoided, which until now prohibited the reduction of the acceleration period. With computing devices the movement of the mass can now be really controlled in relation to a selected velocity profile and/or a position profile or at least a part thereof.

Abstract: A direct drive electro-mechanical press for encapsulating semiconductor devices has at least a clamping axis and a transfer axis. The clamping axis has a planetary roller screw coupled to a tie bar platen assembly on which at least one top mold is mounted. A two-speed gearbox is further coupled to the clamping axis for switching between a high speed mode and a high torque mode along the clamping axis. The two-speed gearbox has a high speed clutch coupled to a speed reducer and a high torque clutch respectively. The transfer axis is slidably located above the clamping axis; the transfer axis has another planetary roller screw coupled to a bottom platen on which at least one bottom mold is mounted. The transfer axis transfers the molding resin from the pot into the cavities formed when the top and bottom molds are clamped together.

Abstract: To produce base boards each usable for an information recording medium such as a photoelectromagnetic disc or the like by employing an injection molding process, an injection molding die of the type comprising a die half on the stationary side and a die half on the movable side includes a cylindrical supporting member on the stationary side, a die assembly on the stationary side arranged in the cylindrical supporting member, a cylindrical supporting member on the movable side, a die assembly on the movable side arranged in the cylindrical supporting member, a cylindrical guide member located between both the cylindrical members, a first driving unit for displacing the die half on the movable side, and a second driving unit for actuating an ejector sleeve.