A toggle mold closure assembly for injection presses includes: fixed, mobile and reaction planes, mounted on columns; a control unit of the toggle, having four pairs of levers, arranged symmetrically at two sides, in upper and lower parts of the structure, interconnected by a pin and to the reaction plane and mobile plane by respective pins; and an actuation unit of the control element. The control unit is placed on the axis of the toggle in the middle of the pairs of main side levers, which have an outward movement. The control unit is connected, by control connecting rods, to the levers of the toggle connected to the reaction plane, and is placed between the central connection pin of the levers and the reaction plane. The control unit is provided with heads for connection to the connecting rods external to the reaction plane and turned towards the reaction plane.

A toggle lever clamping unit for an injection molding machine includes fixed and movable platens, a support plate, a toggle lever mechanism operatively connected with both the support plate and the movable platen, a cross clamp operatively connected with the toggle lever mechanism and movable along a machine longitudinal axis, and an electric drive for moving the cross clamp. In addition, a hydraulic drive is operatively connected with the cross clamp and includes a fluid-operated piston cylinder system, with the lengths of the cylinder and the piston rod being coordinated with one another such that the hydraulic drive follows a travel path of the cross clamp as the movable platen travels between an open position of the clamping unit, in which the toggle lever mechanism is swung in, and a closed position in which the toggle lever mechanism assumes a predeterminable extended position and a clamping force is built up.

An opening/closing apparatus is provided for use in a molding apparatus, such as an injection molding machine. The opening/closing apparatus may eliminate the influence of a slight gap formed between a bush and a pin in a link connecting portion of a toggle link mechanism and in addition, can enhance workability e.g., in mold replacement. An opening/closing apparatus of the present technology may include an opening/closing mechanism including a toggle link mechanism connecting a pressure-receiving platen and a movable platen; a drive mechanism for driving the opening/closing mechanism; and a core-back hydraulic cylinder for applying a load to the movable platen in a given direction in conjunction with the first drive mechanism, configured to perform the operation of slightly opening of the mold.

An opening/closing apparatus is provided for use in a molding apparatus, such as an injection molding machine. The opening/closing apparatus may eliminate the influence of a slight gap formed between a bush and a pin in a link connecting portion of a toggle link mechanism and in addition, can enhance workability e.g., in mold replacement. An opening/closing apparatus of the present technology may include an opening/closing mechanism including a toggle link mechanism connecting a pressure-receiving platen and a movable platen; a drive mechanism for driving the opening/closing mechanism; and a core-back hydraulic cylinder for applying a load to the movable platen in a given direction in conjunction with the first drive mechanism, configured to perform the operation of slightly opening of the mold.

A toggle lever clamping unit for an injection moulding machine includes fixed and movable platens, a support plate, a toggle lever mechanism operatively connected with both the support plate and the movable platen, a cross clamp operatively connected with the toggle lever mechanism and movable along a machine longitudinal axis, and an electric drive for moving the cross clamp. In addition, a hydraulic drive is operatively connected with the cross clamp and includes a fluid-operated piston cylinder system, with the lengths of the cylinder and the piston rod being coordinated with one another such that the hydraulic drive follows a travel path of the cross clamp as the movable platen travels between an open position of the clamping unit, in which the toggle lever mechanism is swung in, and a closed position in which the toggle lever mechanism assumes a predeterminable extended position and a clamping force is built up.

A mold clamping machine includes a stationary mount, a movable mount, a mold-clamping mechanism and a mold opening and-closing mechanism. The mold-clamping mechanism includes a cylindrical constraining mechanism and has a magnet mechanism built therein. By causing a current to flow or not flow, the constraining mechanism changes to an unconstrained state or to a constraining state. In the unconstrained state, the mold clamping mechanism is movable relative to and along a tie bar. In the constrained state, the mold clamping mechanism becomes unmovable relative to the tie bar. The magnet mechanism positions the mold-clamping mechanism at any desired arbitrary position along the tie bar.

A base frame is used in an injection molding machine provided with a mold clamping unit having a platen, on which at least the mold clamping unit is placed and which supports the mold clamping unit. The base frame includes: a pair of main beams spaced apart from each other in a width direction of the base frame and extending side by side in a longitudinal direction of the base frame; and a platen attachment plate which is disposed on the main beams and to which the platen is attached, in which outer edge portions of the platen attachment plate in the longitudinal direction include welding points joined by welding to the main beams, and the platen attachment plate has a shape in which a length in the longitudinal direction is longer at an outer end than at an inside part in the width direction.

A hybrid core driving device of an embodiment includes: a cylinder tube; a first cover member at one end of the cylinder tube; a second cover member at the other end thereof; a rod in the cylinder tube, having a connecting portion at one end to be connectable to a core and an annular flange on the side of the second cover member, and penetrating the first cover member; a nut fixed to the rod; a screw shaft penetrating the second cover member and the nut and provided to be insertable into the rod; a motor rotating the screw shaft; a piston in the cylinder tube, allowing the rod to penetrate therethrough, and slidable with respect to the cylinder tube and the rod; and a connection portion connectable to a pipe supplying a hydraulic liquid to a region surrounded by the cylinder tube, the first cover member, and the piston.

A hybrid core driving device of an embodiment includes: a cylinder tube; a first cover member at one end of the cylinder tube; a second cover member at the other end thereof; a rod in the cylinder tube, having a connecting portion at one end to be connectable to a core and an annular flange on the side of the second cover member, and penetrating the first cover member; a nut fixed to the rod; a screw shaft penetrating the second cover member and the nut and provided to be insertable into the rod; a motor rotating the screw shaft; a piston in the cylinder tube, allowing the rod to penetrate therethrough, and slidable with respect to the cylinder tube and the rod; and a connection portion connectable to a pipe supplying a hydraulic liquid to a region surrounded by the cylinder tube, the first cover member, and the piston.

Disclosed is an electric mould opening and closing system for an injection moulding machine, includes a mould opening and closing driving device including a mould transferring mechanism, a brake mechanism, a mould clamping mechanism and a brake auxiliary mechanism having a first state and a second state. When opening or closing mould, driven by the mould transferring mechanism, the brake auxiliary mechanism and the mould transferring mechanism make the movable plate move forward or backward in a horizontal direction, and the mould transferring mechanism is separated from the mould clamping mechanism by the brake auxiliary mechanism, and the brake auxiliary mechanism is in the first state. When braking, a linkage is formed between the brake mechanism and the mould transferring mechanism, the brake auxiliary mechanism is in the second state, and the mould clamping mechanism locks the movable plate.