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: In a mold closing unit for use in an injection molding machine for processing synthetic materials a stationary mold carrier and a movable mold carrier are provided. A pressure cylinder comprising a pressure piston serves for building up the locking pressure and at least one piston-cylinder-unit serves for moving the movable mold carrier. The drive piston or drive cylinder are interconnected with the pressure cylinder. The pressure cylinder and the movable mold carrier constitute a motion unit displaceable relative to the stationarily mounted pressure pistons.

Abstract: A compression equipment possesses generality of various injection molding machine by which injection and mold under compression is performed. The compression equipment is composed as a unit and is installed between a moving die plate of the injection molding press and a moving mold. The compression equipment possesses a moving mechanism containing first tapered members moved by a cylinder and second tapered members contacting with the first tapered members and the moving mold moves toward a stationary mold by the cylinder.

Abstract: A positive internal latch lock for an injection mold having outer, intermediate, and inner plates movable between open and closed mold positions. The latch lock includes a mechanism for securing the outer and intermediate plates at a predetermined spaced distance when the mold is opened at a first parting line between the outer and intermediate plates. Further, the latch lock provides a mechanism for locking the intermediate and inner plates together until the outer and intermediate plates are secured at the predetermined spaced distance. After the outer and intermediate plates are secured, the intermediate and inner plates are allowed to open at a second parting line.

Abstract: A main frame for a C-type frame for die tightening units mounted for an injection molding machine is prepared by employing a casting process. The main frame includes an opposing pair of side frames, upper frames projecting forward of fore upper surfaces of the side frame and a front frame extending between both the side frames. The side frames, the upper frames and the front frame are cast and integrated with each other to form the main frame having a predetermined width. A base board made by casting or made of a steel plate is bolted to the lower end of the main frame to form a C-type frame, and a pair of support columns each made of a steel material extend through the joint portions where the side frames are integrally joined to the front frame. The tensile strength and the compressive strength of the C-type frame are increased by tightening the support columns via nuts threadably engaged with male threads machined at the opposite ends of each support column.

Abstract: In an apparatus for generating clamping force in injection molding machines having stationary and moving platens, between which an injection molding die is mounted, and a traversing mechanism associated with the moving platen for opening and closing of the injection molding die, the present invention provides means for locking the traversing mechanism after the molding die has been closed. The clamping force required during injection is generated by at least one element made of a magnetostrictive material that is mounted between the traversing mechanism and the moving platen. Each magnetostrictive element is surrounded by a magnetic coil that is controllably energized to produce an alternating magnetic field which causes elongation of the associated element, generating the clamping force.

Abstract: An injection mold device comprises a first matrix attached to a movable platen and a second matrix attached to a fixed platen. A multiplicity of first cavity units are attached to the first matrix. A multiplicity of second cavity units are provided for selective removable attachment to the first matrix during a mold-clamping state and to the second matrix during a mold-opening state. A self-holding device is associated with the first matrix for maintaining a clamping force between the first cavity units and the second cavity units during the mold-clamping state. A mold-opening device is associated with the second matrix for removably attaching the second cavity units to the first matrix in the mold-clamping state and for removing the second cavity units from the first matrix in the mold-opening state.

Abstract: A foam molding apparatus with improved seal for sealing the mold lid to the bowl. The bowl and lid include inclined sealing surfaces surrounding the mold cavity with the bowl sealing surfaces being concave and the lid sealing surface being convex. Both the bowl and lid are resiliently supported on frames so that the lid can self align upon the bowl as the convex lid sealing surface engages the concave bowl sealing surface. Adjusting screws are carried by the lid carrier frame and engage the lid to apply pressure to the lid forcing the lid against the bowl sealing surface with the bowl being resiliently carried on a supporting frame allowing the bowl to float relative to the frame to achieve an even pressure distribution about the mold cavity at the sealing surfaces. The lid and bowl are both formed with fluid passages to enable hot water to be circulated through the mold maintaining the mold at an elevated temperature.

Abstract: A mold locking device for an injection molding machine is provided. The device includes a stationary disc and a movable disc displaceable to lock a mold placed between the stationary disc and the movable disc. Four oil cylinders are provided to move the movable disc on four guide rods back and forth. Four push rods are provided, each having a front end secured to the movable disc and a rear end extending through four cylindrical tubes disposed with a respective one of four holes formed in a support disc. A piston disposed within a piston chamber formed in a front surface of the support disc is pushed forward to respectively push a shield plate. The shield plate displaces the four push rods so as to push the movable disc with a great force, after the movable disc has been pushed forward to lock the mold stably.

Abstract: The method and apparatus for producing large injection molded products and producing high tonnage injection molding apparatus utilizing tie rods interposed between the mold part supporting platens, the tie rods being removed from proximity to the mold parts upon the mold parts being opened to facilitate removal of large parts from the mold, and to facilitate mold part setup and installation. The tie rods are axially displaceable with respect to both mold part supporting platens and selectively locked and released from the platens during each molding cycle.

Abstract: An apparatus for injection molding plastics material has an injection unit for delivering a plasticized melt through a nozzle, a press unit for urging a mold together at a predetermined pressure, a mold mounted in the press unit and a programmable controller operably connected to the injection unit and the press unit for automatically controlling the operation of the apparatus for repetitively producing uniform articles. The mold has a stationary mold section and a moveable mold section. The press unit is adapted for reciprocating the moveable mold section between an open position and a closed position. The stationary mold section has a plurality of ports at pre-selected points. Each port has a controllable gate for selectively opening and closing the ports for passing melt to a mold cavity until the melt fully occupies the mold cavity while controlling and minimizing melt lines formed when a flow of melt from one of the ports meets with a flow of melt from another of the ports.

Abstract: An insert molding machine has first and second mold sections, one of which is movable between open and closed positions, A slide carrying inserts is movable from an open position to a closed position wherein the slide and first and second mold sections define a mold cavity in which a part is molded. A single direction cam mechanism in the slide engages a pin in the movable mold section to releasably connect the slide and movable mold section during closure. The connection causes the slide to open upon subsequent opening of the movable mold section but allows the slide to be closed independently of the movable mold section.

Abstract: A positioning device for mating two components having a spherical positioning element to be engaged into a positioning recess. The recess is formed in a plate-shaped member forming the bottom of a pot-shaped insert so that the plate-shaped member can be deflected inwards.

Abstract: A motor driven type die tightening apparatus for an injection molding machine includes a plurality of tie bars horizontally bridged between a pair of stationary die boards mounted on a platform of the injection molding machine, and a movable die board is displaceably arranged between the stationary die boards with the tie bars inserted therethrough. A part of each of the tie bars inserted through the movable die board is designed in the form of a ball screw shaft adapted to be threadably engaged with a ball nut member. As an electric motor installed on one of the stationary die boards is rotationally driven to rotate the ball nut members, the movable die board is slidably displaced toward or away from one of the stationary die boards.

Abstract: This invention relates to automating a process for manufacturing articles from plastic, particularly recyclable plastic waste. A lengthened separator head is flanged to a plasticizer to supply melting serially to several molds, by way of mold inlet shut-off mechanism. A preprogrammed control device monitors the filling of a respective mold by way of a pressure sensor in the mold. When the desired filling of the mold has occurred, the inlet shut-off mechanism is closed by the control device and another mold that is ready to be filled is filled with melting by the opening of the corresponding inlet shut-off mechanism at the another mold. In addition, the control device controls the locking and tightening of the mold as well as its opening and emptying.

Abstract: A horizontal injection and compression molding apparatus has an injection device (3) and a compression molding device, wherein the compression molding device (2) includes: a stationary die plate (12) for holding a stationary die (11), a movable die plate (22) for holding a movable die (21), means (30) for rapidly extending and retracting the movable die plate (22), relative to the stationary die plate (12), means (40) for locking the movable die plate (22) to tie bars (51) at a position where the movable die plate (22) approaches the stationary die plate (12), and means (50) for fastening the dies after the movable die plate (22) is locked to the tie bars (51); and wherein the injection device (3) for feeding a molten plastic material into a mold cavity (90) between the stationary die (11) and the movable die (21) is characterized in that it initiates feeding of the molten plastic material into the mold cavity ( 90) when the stationary die (11) and the movable die (21) are parted from each other by a predeter

Abstract: A machine for manufacturing polystyrene foam products, whereby a mold comprising a first half and a second half mold defining a molding chamber when closed, is loaded, with the two half molds locked in the closed position, onto the machine and into an operating position wherein the mold is connected automatically to granular polystyrene and utility fluid supply lines. In this operating position, the two half molds are rendered mutually mobile with the first half mold, connected to the utility supply lines, remaining locked to a fixed frame on the machine, and the second half mold remaining locked to a mobile frame on the machine.

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 actuate 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: A closing unit for injection mold machines is disclosed which generally includes two end plates, guide crosspieces connecting the end plates at a distance from one another, an intermediate plate which is parallel to the end plates and displaceable longitudinally relative to the guide crosspieces and moving cylinders which abut an end plate and act at the intermediate plate via their piston rods. The moving cylinders also displace the intermediate plate along the guide crosspiece in the closing and opening direction to vary its distance from the other end plate. The intermediate plate and the other end plate form a gripping plate for the two mold halves of a form tool which is brought into its closing position by the two gripping plates. Increased closing force may be applied to the form tool at a central die via a pressure cushion insertable between one end plate and the intermediate plate.

Abstract: A molding apparatus with die-clamping and alignment devices has a stationary die plate for holding a stationary die, a movable die plate for holding a movable die, a device for moving forwardly/rearwardly the movable die plate with respect to the stationary die plate, a fastening device for fastening the movable die plate and the tie bar to each other by hydraulic force when the stationary die and the movable die have been approached to predetermined positions, and a tie bar for clamping the movable die and the stationary die by die-clamping force generated by a die-clamping cylinder, and a primary alignment mechanism provided for at least one junction among junctions between a piston of a die-clamping hydraulic cylinder and the tie bar, between a support plate and the tie bar, and between the movable die plate and a movable die plate support member, in order to permit the two dies to be aligned to each other by a secondary position alignment function, such as a guide pie for aligning the two dies at the time

Abstract: A molding system has a base, a fixed mold plate secured to the base, a fixed mold half carried on the fixed mold plate, a movable mold plate displaceable on the base longitudinally forward away from the fixed mold half and backward toward the fixed mold half, and a movable mold half carried on the movable plate and fittable with the fixed mold half. A mold-closing apparatus has a pair of main cylinders fixed to the fixed mold half and respective main pistons subdividing the main cylinders into respective front and rear main compartments and each having a piston rod secured to the movable mold plate and formed with a longitudinally extending chamber. A small-diameter fast-closing piston and cylinder are formed in one of the piston rods, and the other piston rod is provided internally with a force-amplifying piston unit. Two flow-control valves and check valves control the system.

Abstract: An injection molding machine includes a machine frame, stationary and movable mold fixing plates and a cylinder plate carrying at lest one piston-cylinder unit. The cylinder plate and the stationary mold fixing plate are not connected as usual by beam members, but are connected exclusively by way of the machine frame. A piston of the piston-cylinder unit is rigidly connected to the movable mold fixing plate and is pivotable relative to a cylinder of the piston-cylinder unit.

Abstract: A mold clamping device in an injection molding machine comprising a stationary electromagnetic plate and a movable electromagnetic plate provided at the side of the stationary electromagnetic plate away from the movable platen so as to be capable of being moved toward and away from the stationary electromagnetic plate. Both electromagnetic plates are each provided with an electromagnetic coil for generating a magnetic attracting force. The device further comprises a movable platen driving mechanism which is composed of a combination of a feed screw shaft and a nut member and is connected to the movable platen. An operation for closing the molds is performed by the driving mechanism. Subsequently, a mold clamping operation of both molds is performed by a magnetic attracting force from the electromagnetic coil.

Abstract: A clamping apparatus of molding machine including a base; a fixed board disposed on the base; a movable board movable relative to the fixed board; a plurality of mold clamping cylinders disposed in predetermined positions of the fixed board, the mold clamping cylinders each having a mold clamping piston with a tie bar reception hole and a tie bar connection device disposed on the mold clamping piston; a plurality of tie bars with a thread at their one end, the tie bars being disposed in correspondence with the mold clamping cylinders on the movable board; a plurality of mold opening/closing cylinders for moving the movable board; and an axially movable sleeve associated with each clamping cylinder for adjusting an axial position of an associated piston to adjust an engagement position of the tie bar connection device, the sleeve being disposed in an opening in the fixed board and forming an extension of the tie bar reception hole, with one end of the sleeve abutting against a reception wall provided in each p

Abstract: A stripper plate locking device for use with the mold in a molding machine (e.g., injection, compression or transfer) is presented. The mold has openings in each of the plates of the mold for accepting the stripper plate locking device. The device includes a release pin, a body member and a collet member. The pin has a shaft with a head disposed at one end and a first pair of camming surfaces with a shaft portion therebetween disposed at the other end. The body members has a second pair of camming surfaces with a cylindrical portion therebetween disposed at one end thereof and an opening therethrough wherein the shaft of the pin passes. The collet member has a plurality of expandable resilient fingers which define an opening. The collet member includes a third pair of camming surfaces with a first cylindrical section therebetween for expanding the fingers in cooperation with the first camming surface and the shaft portion of the pin.

Abstract: A formwork, a device for clamping the formwork and a mechanism for actuating the clamping are taught. The formwork includes two molds, which mount together. The clamping device secures the mounted molds and allows the formwork to operate. The clamping device includes a movable member and a tension member, which locks the movable member to protruding sections of each mold. This clamping device is duplicated along the length of the protruding sections. The mechanism for actuating the clamping exerts force upon the movable member to secure it between the tension member and the protruding sections. This same mechanism can withdraw the movable member from the clamp. By this, the clamping is accomplished and a more efficient formwork is achieved.

Abstract: A mold closing apparatus and process for use with an injection molding machine are described. The mold is opened and closed by hydraulic pressure. The disclosed apparatus and method relate to the use of an immobile differential piston within a displaceable, double-action differential piston which moves within an immobile piston cylinder. This arrangement permits the use of smaller diameters to produce the necessary closing force. The immobile differential piston contains the necessary hydraulic passage for routing hydraulic fluid to the appropriate surfaces for exerting opening and closing forces. The use of a plurality of displaceable, single-acting pistons in parallel with the differential piston further reduces the diameters needed for exerting the claim force. Locating these single-acting pistons within the support column cylinders makes for an ever more compact apparatus.

Abstract: The present invention relates to an improved clamping mechanism for use in injection molding machines and similar pieces of equipment where it is desired to apply a clamping force to particular components. The clamping mechanism of the present invention employs at least one spaced apart brake plate mounted to one component and a braking unit for engaging the brake plates. The braking unit has at least one pair of brake pad linings surrounding the brake plates and at least one piston-cylinder unit for causing frictional engagement between the respective brake pad linings and the brake plate(s). When the brake pad linings grip the brake plate(s), the braking unit becomes locked to the components to which the brake plate(s) are attached. The clamping mechanism of the present invention may be employed on simple injection molding machines as well as TANDEM.RTM. injection molding machines.

Abstract: A hydromechanic mold clamping mechanism for injection molding machines including a movable mold carrying plate provided with hydraulic cylinder rods linked to a fixed mold carrying plate. In accordance with the invention, movable carrying plate (2) receives four sets of hydromechanic mechanisms (6) independently mounted on said movable carrying plate (2) through set of support rods (12 and 13) fixed to said movable plate (2), supporting hydromechanic sets (6) respectively.

Abstract: A self-clamping mold assembly for injection molding articles from material cured by the application of temperature and pressure. The assembly includes a mold body and a lock mechanism housed within the body. The body has aligned, independent plates, each having a mold cavity and a lock bore portion with a central axis. The lock mechanism includes a tie rod assembly for engagement with one of the independent plates, and a force generator assembly for engagement with another of the independent plates. The tie rod and force generator assemblies are engaged with the lock bore portion of the plates. The tie rod assembly includes a tie rod adapted for rotatable engagement within the mold assembly, and the force generator assembly includes a lock shaft adapted for locking engagement with the tie rod and a spring biased member retained with respect to the lock shaft.

Abstract: A mold for an organic polymer, ophthalmic lens element has separate upper and lower mold members with each mold member being composed of a thermoplastic polymer. The lower mold member has a central, bowl-shaped cavity with contours that conform to those of a lens to be molded therein, and has an annular rim surrounding the upper edge of the cavity. The upper member has a central portion with an under surface that corresponds in contour to that of the upper surface of the lens to be molded, and has an annular rim that surrounds the central portion and rests on the annular rim of the lower member when the two members are assembled.

Abstract: A mold clamping apparatus for use in molding machines such as injection molding machines, diecasting machines and press molding machines. The mold clamping apparatus includes a base; a fixed panel and a movable panel disposed on the base and respectively supporting mold halves; a plurality of tie bars each having a screw shaft at one end thereof which passes through the movable panel; a plurality of clamping cylinders disposed on the fixed panel for clamping an other opposite end of the tie bars when the mold apparatus is in a closed position; a mechanism for moving the movable panel toward and away from the fixed panel; an adjusting mechanism, disposed on the movable panel, for simultaneously fixedly adjusting the axial position of the plurality of tie screws with respect to the movable panel such that the distance between the movable panel and the fixed panel when the mold apparatus is in the closed position can correspondingly be adjusted so as to accommodate molds of varying sizes.

Abstract: The coupling means of the assembly comprise machine-side coupling parts, which are movable by means of hydraulic cylinders into coupling engagement with the mold-side coupling parts secured to the sections of the injection mold. As a result, the movable mold section is provided with a coupling for connecting the mold to supply lines for a performance of auxiliary operations in both mold sections and the stationary mold section is provided with a coupling for conducting a fluid for the temperature control of both mold sections. Because the coupling for the temperature control and the coupling for any auxiliary operations to be performed in the injection mold are separated from each other, the expenditure involved in the coupling equipment can be adapted to the current requirements of a potential buyer and nevertheless it is possible to effect a temperature control of the injection mold also when it is outside the clamping region of the injection molding machine.

Abstract: An injection molding system is used to mold a preform having an undercut. The molding system includes an injection core mold, and three injection cavity molds, which are a neck mold for defining a neck of the preform, a first cavity mold including two mold halves for defining an outer wall of the preform having the undercut, and a second cavity mold for defining a remaining outer wall of the preform. The molding system also includes a clamping unit for opening and clamping the foregoing molds and a mold half opening mechanism for opening and clamping mold halves of the first cavity mold.

Abstract: The present invention relates to an improved clamping mechanism for use in injection molding machines and similar pieces of equipment where it is desired to apply a clamping force to particular components. The clamping mechanism of the present invention employs at least one spaced apart brake plate mounted to one component and a braking unit for engaging the brake plates. The braking unit has at least one pair of brake pad linings surrounding the brake plates and at least one piston-cylinder unit for causing frictional engagement between the respective brake pad linings and the brake plate(s). When the brake pad linings grip the brake plate(s), the braking unit becomes locked to the components to which the brake plate(s) are attached. The clamping mechanism of the present invention may be employed on simple injection molding machines as well as TANDEM.RTM. injection molding machines.

Abstract: A method and apparatus for separating an upper (12) and lower (14) mold plate of a mold assembly (10) from a preformed substrate or casting (16) by including a mold ejection apparatus (70) having a support surface (76) to receive and support the mold assembly (10). A plurality of clamps (84) pivotally connected to the support surface (76) engage the preformed substrate (16) at spaced apart intervals about the periphery of the preformed substrate (16) to restrain the substrate (16) and lower mold plate (14) against the support surface (76). The apparatus further includes a plurality of secondary hydraulic pumps (98) having a piston (106) and cylinder (108) assembly and a lifting bar (120) pivotally connected to one end of the piston (106). The secondary pumps (98) are supported on the support surface (76) at spaced apart intervals adjacent the periphery of the mold assembly (10).

Abstract: A plastic lens molding apparatus. A first mold, having a concave optical surface, and a second mold, having a convex optical surface, are arranged so that the optical surfaces are opposed to each other, each of the optical surfaces having an apex. An adhesive tape is applied over both the first and second molds to form a cavity between the molds. A plastic material is injected into the cavity and is then set. A plane including a tangent at an apex of the optical surface of at least one of both the first and second molds is inclined at a predetermined angle to an optical axis of the lens.

Abstract: A hydraulic clamping apparatus for use with injection molding machines and including a first hydraulic actuator having a first cylinder and a first hollow, cup-shaped piston with a closed head portion disposed for reciprocating movement within the first cylinder, and a foot portion axially spaced from said head portion and defining an opening; a second hydraulic actuator having a second piston, a rod extending axially through the opening into the first piston and connected between the first and second pistons, and a second cylinder mounted for reciprocating movement on the second piston and through the opening between a recessed position substantially within the first piston and an extended position substantially outside the first piston; and a clutch operable in the extended position of the second cylinder to produce engagement thereof with the first piston. The overall length of the apparatus is minimized by placement of the second actuator cylinder within the first piston.

Abstract: A wedge type locking member (27) is brought into contact with a first piston (12) for clamping by means of a pushing spring (28). Thereby, the first piston (12) is prevented from returning from the clamping position (X) to the unclamping position (Y). The locking member (27) is provided with two pressure receiving surfaces (F)(S) having substantially equal areas. A fluid pressure within a first actuation chamber (13) for clamping acts upon these pressure receiving surfaces (F)(S). The locking condition of the locking member (27) is cancelled by means of a second piston (39).

Abstract: A mold closing apparatus and process for use with an injection molding machine are described. The mold is opened and closed by hydraulic pressure. The disclosed apparatus and method relate to the use of an immobile differential piston within a displaceable, double-acting differential piston which moves within an immobile piston cylinder. This arrangement permits the use of smaller diameters to produce the necessary closing force. The immobile differential piston comprises the necessary hydraulic passages for routing hydraulic fluid to the appropriate surfaces for exerting opening and closing forces.The use of a plurality of displaceable, single-acting pistons in parallel with the differential piston further reduces the diameters needed for exerting the closing force. Locating these single-acting pistons within the support column cylinders makes for an even more compact apparatus.

Abstract: There is provided by the present invention a compression molding tool for producing apertures of a desired configuration in preselected locations in a compression molded article and a method for producing the apertures. The tool has first and second relatively movable tool halves each supporting a mold section. The mold section associated with the second tool half includes a movable portion that is relatively movable with respect to the second tool half. The first tool half is moved relative to the second tool half until the first and second mold sections engage each other to form a mold cavity therebetween. Devices for creating apertures are included on at least one of the mold sections and are extended into appropriately configured receptacles in the other mold section after the mold sections are engaged, but before molding material is forced by compression into the mold cavity.

Abstract: In an injection press having a mold in the form of a moveable die positioned on a moveable plate and a fixed die positioned on a fixed plate, the moveable die is moved to a compression starting position which is spaced slightly from the fixed die, the resin to be molded is injected into the mold cavity between the two dies, and the moveable die is then moved towards the fixed die to compress the thus injected resin. The compression starting position is determined by mechanical positioning means which can adjust the compression starting position. The stroke deviation for the compression can be adjusted by detecting the position of the moveable plate during the compression stroke so that the levelness of the moveable die can always be maintained during the compression stroke. Thus, the parallelism of the two dies can be stably maintained against the injection pressure.

Abstract: The present invention relates to a tire vulcanizing press which presses to fasten an upper and a lower molds used for vulcanizing a tire by hydraulic cylinders and raises and lowers the upper mold in an up-and-down direction to remove the tire being finished a vulcanizing processing.In the tire vulcanizing press in accordance with the present invention, since the plurality of tie rods hung from the upper mold installation member are respectively connected through the lock device to the cylinder rod of the fastening cylinder and the lower mold installation member to which the fastening cylinder is fixed is pressed to rise toward the upper mold installation member, only the tie rods are positioned around the upper and the lower molds. Therefore, a maintenance of the upper and the lower molds becomes easy, and it also becomes possible to reduce the apparatus size of the tire vulcanizing press as a whole.

Abstract: A clamping apparatus of molding machine including a base; a fixed board disposed on the base; a movable board movable relative to the fixed board; a plurality of mold clamping cylinders disposed in predetermined positions of the fixed board, the mold clamping cylinders each having a mold clamping piston with a tie bar reception hole and a tie bar connection device disposed on the mold clamping piston; a plurality of tie bars with a thread at their one end, the tie bars being disposed in correspondence with the mold clamping cylinders on the movable board; a plurality of mold opening/closing cylinders for moving the movable board; and a mold thickness adjustment device having a movable stopper for contacting an end of each tie bar to control the axial position of each of the tie bars with respect to the connection devices during clamping.

Abstract: A clamping apparatus of molding machine including a base; a fixed board disposed on the base; a movable board movable relative to the fixed board; a plurality of mold clamping cylinders disposed in predetermined positions of the fixed board, the mold clamping cylinders each having a mold clamping piston with a tie bar reception hole and a tie bar connection device disposed on the mold clamping piston; a plurality of tie bars with a thread at their one end, the tie bars being disposed in correspondence with the mold clamping cylinders on the movable board; a plurality of mold opening/closing cylinders for moving the movable board; and a differential circuit connected between a front oil chamber and a rear oil chamber of each of the plurality of mold clamping cylinder.

Abstract: A closing device (9) (52) for axially connecting two half casings (7, 8) of a tire curing mold (1), the closing device (9) (52) featuring a number of calibrated hydraulic cylinders (19), each rigidly connected to a peripheral outer flange (12) on one of the half casings (7, 8), and having a rod (37) extending through a respective opening (41) (54) formed axially through a flange element (18) (53) on the other of the half casings (7, 8); each rod (37) having a head (42) (56) movable in relation to the flange element (18) (53) to and from a position of axial engagement with the flange element (18) (53) itself.

Abstract: An injection molding machine and method of operation having a plurality of accessory arrangements for molding a plurality of piece parts in efficient overlapping time cycle using primary and secondary molten plastic injection units, primary and secondary clamping units, a plurality of injection units in various arrays including molding piece parts in reverse or uniform orientation.

Abstract: A clamp assembly for selectively friction clamping a member with respect to a column includes inner and outer threaded portions positioned concentrically around the column and within a housing attached to the member. The inner and outer threaded portions are threaded together to transfer force therebetween. A sealed chamber between the inner and outer threaded portions is selectively pressurized to cause an inner surface on the inner threaded portion to displace inwardly onto an outer surface of the column and the outer threaded portion displacing outwardly to provide frictional resistance to longitudinal movement of the member with respect to the column. The inner thread portion and the outer thread portion have a thread pitch difference to substantially compensate for strain deformation occurring thereupon.

Abstract: A clamping system includes a fixed platen fixed to one end of a machine base and a plurality of clamping cylinders, the fixed platen holding a fixed mold therein, a movable platen fixed to the other end of the machine base and holding a movable mold therein, a plurality of tie bars extending through the movable platen and including pistons at their one ends, the pistons being slidably received within the clamping cylinders, and screw threads or grooves substantially at their longitudinal center, a unit disposed between the movable platen and the fixed platen and operable to move the movable platen to and from the fixed platen, two-part nuts mounted to the movable platen and meshingly engageable with the screw threads or grooves of the tie bars, and stoppers each of which is engaged with a recess provided on each of the tie bars mounted to the movable platen on the side opposite to the fixed platen characterized in that screws are threaded at end portions of the tie bars on the side of the fixed platen, screws

Abstract: A friction clamp assembly for securing a mold of an injection molding machine in a closed position includes a column rigidly secured to a moving platen carrying a mold half and a gripper bush assembly for frictionally engaging and locking the column in a desired position. The clamp assembly further includes a clamp piston for clamping the moving platen in a mold closed position. The clamp assembly transmits a clamping force to portions of a moving platen other than end portions via the column so that platen parallelism is maintained during closing, injection and hold pressure portions of a molding cycle while platen bending is substantially avoided.