Abstract: The present invention relates to a clamping unit for an injection molding machine, comprising a displaceable clamping plate (2), a support plate (3) and a drive device acting between the displaceable clamping plate (2) and the support plate (3), which has at least one electric motor (21, 121) and at least one connecting rod (10-13; 110-113), wherein the electric motor (21, 121) directly or indirectly acts on the connecting rod or connecting rods (10-13; 110-113) for opening, closing and/or applying the clamping force. According to the invention, it is proposed to provide in addition to the electric motor (21, 121) at least one separate hydraulic drive (116, 116?, 116?), which is joined by a hinge separately to a connecting rod and acts in parallel to and independently of the electric motor at least at times for opening, closing and/or applying the clamping force.

Abstract: The present invention relates to a clamping unit for an injection molding machine, comprising a displaceable clamping plate (2), a support plate (3) and a drive device acting between the displaceable clamping plate (2) and the support plate (3), which has at least one electric motor (21, 121) and at least one connecting rod (10-13; 110-113), wherein the electric motor (21, 121) directly or indirectly acts on the connecting rod or connecting rods (10-13; 110-113) for opening, closing and/or applying the clamping force. According to the invention, it is proposed to provide in addition to the electric motor (21, 121) at least one separate hydraulic drive (116, 116?, 116?), which is joined by a hinge separately to a connecting rod and acts in parallel to and independently of the electric motor at least at times for opening, closing and/or applying the clamping force.

Abstract: A clamping unit for an injection molding machine includes a fixed platen, a support platen, and a moving platen which is arranged between the fixed platen and the support platen for back and forth movement. An opening and closing mechanism constructed as crank drive having at least one crank disk is provided to effect a back and forth movement of the moving platen in relation to the support platen, with the crank disk rotatable by a drive mechanism. A first connecting rod links the crank disk to the support platen, and a second connecting rod links the crank disk to the moving platen, wherein at least one of the first and second connecting rods is articulated in eccentric relationship to the crank disk. A pulling means extends between the support platen and the fixed platen to allow a buildup of a clamping force between the fixed platen and the moving platen.

Abstract: A clamping unit, particularly for an injection molding machine, includes at least one moving platen which is moveably arranged on a frame element. At least one hydrostatic support is provided in an area between the platen and the frame element for facilitating back and forth displacement of the moving platen to thereby avoid speed-dependent friction values. Operation of the clamping unit is realized by building up pressure in a hydrostatic support before the moving platen is initiated for displacement so that the moving plate is slightly raises platen in relation to the frame element. After displacement of the moving platen, the pressure in the hydrostatic support is decreased again.

Abstract: A mold closing device of an injection molding machine for producing plastic parts made of two or more plastic components includes a central mold carrier element which is arranged between two outer mold mounting plates and has two or four opposing mold mounting areas arranged in pairs for affixing two or four mold halves and which is fitted with a turning device supported in a supporting frame. Each of the mold halves of the mold carrier element can be closed against the mold halves of the outer mold mounting plates by a drive mechanism and a mold pressure unit. The outer mold mounting plates are interconnected by columns which extend through the supporting frame for the central mold carrier element. The supporting frame is fixedly connected to the machine frame while the outer mold mounting plate is displaceably supported on the machine frame.

Abstract: A clamping unit, particularly for an injection molding machine, includes at least one moving platen which is moveably arranged on a frame element. At least one hydrostatic support is provided in an area between the platen and the frame element for facilitating back and forth displacement of the moving platen to thereby avoid speed-dependent friction values. Operation of the clamping unit is realized by building up pressure in a hydrostatic support before the moving platen is initiated for displacement so that the moving plate is slightly raises platen in relation to the frame element. After displacement of the moving platen, the pressure in the hydrostatic support is decreased again.

Abstract: A clamping unit for an injection molding machine includes a fixed platen, a support platen, and a moving platen which is arranged between the fixed platen and the support platen for back and forth movement. An opening and closing mechanism constructed as crank drive having at least one crank disk is provided to effect a back and forth movement of the moving platen in relation to the support platen, with the crank disk rotatable by a drive mechanism. A first connecting rod links the crank disk to the support platen, and a second connecting rod links the crank disk to the moving platen, wherein at least one of the first and second connecting rods is articulated in eccentric relationship to the crank disk. A pulling means extends between the support platen and the fixed platen to allow a buildup of a clamping force between the fixed platen and the moving platen.

Abstract: A hybrid injection unit for an injection molding machine includes a plasticizing screw having a shaft and constructed for rotation and axial displacement. Operatively connected to the shaft is a first electric motor for rotating the plasticizing screw, and a second electric motor for axial displacement of the plasticizing screw. A cost-efficient construction of the second electric motor and reduced stress of the linkage between this electric motor and the shaft is realized by providing at least one piston and cylinder unit in fluid communication with a pressure source for support of the second electric motor in injection direction, and a traverse acted upon by one end of the piston and cylinder unit and rotatably supporting the shaft of the plasticizing shaft. The traverse acts upon the shaft between a force introduction point of the second electric motor into the shaft, on one hand, and the plasticizing screw, on the other hand.

Abstract: A drive apparatus for an extruder with at least two co-rotating extruder screws having driveshafts includes a housing and a drive motor which is received in the housing and including a stator and a rotor. The rotor is operatively connected to driveshafts of the extruder screws and has arranged thereon a toothed surface in direct engagement with complementary toothed surfaces of at least two of the driveshafts of the extruder screws.

Abstract: A mold closing device of an injection molding machine for producing plastic parts made of two or more plastic components includes a central mold carrier element which is arranged between two outer mold mounting plates and has two or four opposing mold mounting areas arranged in pairs for affixing two or four mold halves and which is fitted with a turning device supported in a supporting frame. Each of the mold halves of the mold carrier element can be closed against the mold halves of the outer mold mounting plates by a drive mechanism and a mold pressure unit. The outer mold mounting plates are interconnected by columns which extend through the supporting frame for the central mold carrier element. The supporting frame is fixedly connected to the machine frame while the outer mold mounting plate is displaceably supported on the machine frame.

Abstract: An injection molding device includes a continuously operating extruder and a discontinuously operating injection unit receiving plastic material from the extruder. The extruder has an extruder barrel which includes a plasticizing zone and a discharge zone, whereby the discharge zone is configured to provide an intermediate storage space and has a cross sectional area which is greater than a cross sectional area of the plasticizing zone. In this way, the discharge zone provides a buffer volume which is filled during the injection process and then emptied again.

Abstract: A mold closing device of an injection molding machine for producing plastic parts made of two or more plastic components includes a central mold carrier element which is arranged between two outer mold mounting plates and has two or four opposing mold mounting areas arranged in pairs for affixing two or four mold halves and which is fitted with a turning device supported in a supporting frame. Each of the mold halves of the mold carrier element can be closed against the mold halves of the outer mold mounting plates by a drive mechanism and a mold pressure unit. The outer mold mounting plates are interconnected by columns which extend through the supporting frame for the central mold carrier element. The supporting frame is fixedly connected to the machine frame while the outer mold mounting plate is displaceably supported on the machine frame.

Abstract: An injection molding machine includes a stationary platen, a movable platen constructed for movement relative to the stationary platen, at least one tie bar for tension-proof connection of the fixed and movable platens, and a traction transmitting securing device including a securing element, disposed on a rear side of one of the platens, for interacting with the tie bar within an engagement zone. The securing element and the tie bar are provided with a number of projections and recesses in axial spaced-apart relationship to establish a form-fitting connection, whereby the projections and the recesses are pressed together when exposed to a tensile stress and interlock at an axial clearance which increases along the engagement zone in axial direction corresponding to the tensile stress of the tie bar.

Abstract: In a two plate closing unit of an injection molding machine the stationary and the movable mold mounting plates are connected by columns, wherein the columns that traverse the fixed mold mounting plate are fixedly connected to a clamping cylinder in which the columns configured at their ends as pressure plungers configured for generating a clamping pressure reciprocate, and while some of the clamping plungers are dual action plungers, the clamping plungers are coupled to a spindle drive and drive unit, such that the spindle drive is at the same time the control drive for a stepped plunger and the closing force and the closing and opening motion is realized by a single drive which operates the spindle and the plunger cylinder unit.

Abstract: A drive apparatus for an extruder with at least two co-rotating extruder screws having driveshafts includes a housing and a drive motor which is received in the housing and including a stator and a rotor. The rotor is operatively connected to driveshafts of the extruder screws and has arranged thereon a toothed surface in direct engagement with complementary toothed surfaces of at least two of the driveshafts of the extruder screws.

Abstract: To displace a moving mold mounting plate (3), a threaded spindle drive is inserted between the moving mold mounting plate (3) and a fixed mold mounting plate (16), whereby one end of each threaded spindle is mounted in the fixed mold mounting plate (16) and is configured as a piston (9) of a hydraulic piston and cylinder unit. The pistons are mounted in the fixed mold mounting plate (16) in hydraulic cylinders and an increased clamping force is created for the platen clamping mechanism by an appropriate impingement of the piston (9). In addition, the invention provides a detachable anti-rotation mechanism (23) for the threaded spindles (15). The invention thus allows an inclined position of the mold mounting plates (3, 16) to be corrected, by the targeted rotation of one or more threaded spindles.

Abstract: An injection molding compounder includes an extruder with an extruder housing and at least one extruder screw rotatably arranged in the housing, for production of melt, and an injection device is fluidly connectable to the outlet of the extruder. An accumulator for temporarily storing melt is connected to the extruder housing in conveying direction of the extruder at a location upstream of the outlet in an area of the extruder screw so that melt produced in the extruder can be stored in the accumulator.

Abstract: A rotary device for a horizontal injection molding machine is configured in the form of a module frame which includes a base plate and a turntable rotatably mounted on the base plate. Drives are provided to move the base plate in longitudinal direction and to rotate the turntable. A fixed mold mounting plate of the injection molding machine can be mounted on a mounting structure of the module frame, whereas a moveable mold mounting plate is received in guides along the sides of the module frame.

Abstract: A hybrid injection unit for an injection molding machine includes a plasticizing screw having a shaft and constructed for rotation and axial displacement. Operatively connected to the shaft is a first electric motor for rotating the plasticizing screw, and a second electric motor for axial displacement of the plasticizing screw. A cost-efficient construction of the second electric motor and reduced stress of the linkage between this electric motor and the shaft is realized by providing at least one piston and cylinder unit in fluid communication with a pressure source for support of the second electric motor in injection direction, and a traverse acted upon by one end of the piston and cylinder unit and rotatably supporting the shaft of the plasticizing shaft. The traverse acts upon the shaft between a force introduction point of the second electric motor into the shaft, on one hand, and the plasticizing screw, on the other hand.

Abstract: A mold closing device of an injection molding machine for producing plastic parts made of two or more plastic components includes a central mold carrier element which is arranged between two outer mold mounting plates and has two or four opposing mold mounting areas arranged in pairs for affixing two or four mold halves and which is fitted with a turning device supported in a supporting frame. Each of the mold halves of the mold carrier element can be closed against the mold halves of the outer mold mounting plates by a drive mechanism and a mold pressure unit. The outer mold mounting plates are interconnected by columns which extend through the supporting frame for the central mold carrier element. The supporting frame is fixedly connected to the machine frame while the outer mold mounting plate is displaceably supported on the machine frame.