A clamping device includes: a stationary platen; a rear platen; a tie bar; a moving platen; a toggle mechanism connected to both the rear platen and the moving platen and used for making the moving platen advance and retreat; a guide rod having one end fixed to the rear platen and the other end extending toward the moving platen; a guide rod support supported by the tie bar at a supported part and supporting the guide rod at a supporting part; and a crosshead configured to advance and retreat under guidance by the guide rod. The advance and retreat of the crosshead expands and contracts the toggle mechanism to make the moving platen advance and retreat. The guide rod support is provided in such a manner that the supported part is arranged rearward of the supporting part and closer to the rear platen than the supporting part along a center axis.

According to an aspect of the present invention, there is provided a mechanism for opening, closing, and clamping a mold or die of an injection molding machine comprising: at least two sets of first toggle linkages opposed to each other; at least two sets of second toggle linkages hingedly connected to said first toggle linkages; at least 2 linear activating means for driving the mechanism towards a closed or open position hingedly connected to said second toggle linkages; a movable platen hingedly connected to first toggle linkages for holding an injection molding die, mold, or die casting die; and at least 2 sets of guide rods for the movable platen to slidingly move along its travel path.

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.

Provided is a mold clamping device that can simplify the component count or structure by including a mold thickness adjustment mechanism that reduces the load on a power source, is easily maintained, and has high design flexibility. Also provided is a mold clamping device that can set a long distance (daylight) between molds without having to upsize the entire mold clamping device and can simplify the component count or structure.

A mold clamping device for split molds includes a first platen, a second platen, a pressure receiving platen, and a mold thickness adjustment mechanism disposed on the pressure receiving platen. At least one of the first platen and the second platen is able to move back and forth so as to approach or depart from the other. The pressure receiving platen is located on a side remote from the first platen, of the second platen. The mold thickness adjustment mechanism includes a rod-shaped rotation member, a power source configured to rotate the rotation member around a rotation axis of the rotation member, the rotation axis being parallel to a longitudinal direction of the rotation member, and a pair of converters configured to convert rotation direction of the rotation member into a movement direction of the second platen. A mold clamping device for split molds includes polygonal first and second platens, a pressure receiving platen, and a toggle mechanism. At least one of the first platen and the second platen is able to move back and forth so as to approach or depart from the other. The pressure receiving platen is located on a side remote from the first platen, of the second platen. The toggle mechanism is disposed between the second platen and the pressure receiving platen and on a diagonal line of the second platen and configured to cause the first and second platens to approach or depart from each other.

A toggle clamp unit of a plastic processing machine, especially of an injection molding machine, including a front plate and a crosshead which is arranged movable relatively to the front plate in a direction of closing, wherein at least two levers are supported articulated at the front plate, wherein the at least two levers are each connected articulated with at least one link which links are supported articulated at the crosshead and wherein the crosshead is provided with at least one linear bearing by which the crosshead is movably supported relatively to the front plate in the direction of closing. To design the linear bearing very smooth-running and to reduce the requirement of lubrication the invention proposes that the linear bearing is designed as a roller bearing.

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.

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 toggle clamp unit of a plastic processing machine, especially of an injection molding machine, including a front plate and a crosshead which is arranged movable relatively to the front plate in a direction of closing, wherein at least two levers are supported articulated at the front plate, wherein the at least two levers are each connected articulated with at least one link which links are supported articulated at the crosshead and wherein the crosshead is provided with at least one linear bearing by which the crosshead is movably supported relatively to the front plate in the direction of closing. To design the linear bearing very smooth-running and to reduce the requirement of lubrication the invention proposes that the linear bearing is designed as a roller bearing.

A toggle mould 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.