Abstract: A device for generating nozzle contact pressure for the nozzle of a plasticizing and injection unit includes a spindle drive system and a measuring sensor to detect when an appropriate nozzle contact pressure has been achieved. The device generates nozzle contact pressure and also makes it possible to adjust and set the contact pressure of the nozzle.

Abstract: The invention relates to a process for the injection molding of fluid-filled plastic bodies and a device to carry out this process, wherein a pressurized, flowable plastic melt is first injected by means of at least one nozzle into a mold cavity clamped by a two-part or multi-part mold until the mold cavity is completely filled. Next, after cooling of the plastic melt on the mold cavity walls has set in, a pressurized fluid is injected in such manner into the interior of the plastic melt located in the mold cavity that the still melted center of the resulting plastic body is expelled into at least one side cavity arranged outside the mold cavity and connected thereto.

Abstract: A device for producing moldings of plastic material having a cavity therein filled with a fluid comprises a mold cavity, an injector for injecting flowable plastic into the mold cavity, an injector for injecting a pressurized fluid into an interior portion of the plastic, and a side cavity connected to the mold to receive flowable plastic melt expelled by the injected pressurized fluid. The side cavity may be randomly lockable and may comprise a closing stuffer which rests flush with respect to the mold cavity interior walls.

Abstract: A mold clamping device is provided for an injection molding machine having a stationary mold half and a movable mold half supported by a movable plate. A drive rod is connected at one end to this movable plate and is received at the other end by a driving ring piston having at least one recess within its inner shell. At least one coupling member such as a split flap is swivably connected to the other end of the rod. A suitable actuator such as a piston driven lever arm is provided to operatingly engage the coupling member with the recess, whereby the mold is clamped.

Abstract: An injection mold unit is provided for an alternate feed, injection molding of parts of a plasticized material and has first and second plasticizing and injection devices, with a respective bores and a mold comprising a heating channel block and a mold cavity. The heating channel has a first passageway connected to the bore of the first plasticizing and injection device, the first passageway having first and second branches in fluid communication with the mold cavity. The heating channel also has as well as a second passageway connected to the bore of the second plasticizing and injection machine and having first and second branches in fluid communication with the mold cavity. One way valves are located in each of the first and second branches of the first and second passageways.

Abstract: A method and device for directing and controlling the operation of an injection molding machine having sensors which provide actual values during machine operation, the machine having actuators forming and executing control orders received from the sensors. The sensors and actuators are serially connected via a closed loop control cable such that all information is available in successive words. The sensors and/or actuators deliver their information jointly and in dependence on the status of the program. The actuators jointly execute their control orders in corresponding numbers. The actuators and sensors are coupled through interface couplers to the closed loop or stub cable.

Abstract: To automate the roughening of the peripheral surface of a shoe upper in the region to be soled, the application of adhesive along such surface and a final deburring operation, prior to injection molding the last supported shoe upper in the region of lateral side mold elements is measured at the peripheral curvature to determine a curved line of spacial coordinates and angles of curvature starting at a preselected null point, and the values are stored. Another last supported shoe upper is moved by a rotary turntable to be scanned at selected points along its periphery for comparing the selected points to the spacial coordinates and angles of curvature. Any deviation therefrom is adapted to a second preselected null point, after which the shoe upper is guided by a computer controlled robotic device along the curved line starting from the second null point.

Abstract: A process of mixing isocyanate and a polyol that reacts to form polyurethane used for the production of shoe soles includes the feeding of the isocyanate and the polyol into the bore of an elongated cylinder having a discharge opening at one end, the bore having a conical surface tapering toward that end, mixing the isocyanate and the polyol into a mixture reacting into the polyurethane by rotating an externally threaded worm in the bore, the worm having a shape matching the shape of the bore, and conveying the polyurethane through the opening into a shoe sole mold cavity. The worm and the cylinder in which it operates is disposed along a substantially vertical axis relative to the mold cavity, and the discharge opening is directed downwardly toward the mole cavity.

Abstract: Outer and inner soles and a sole welt are molded onto shoe uppers. A molded outer sole is formed by injection molding plasticized thermoplastic material into a first mold cavity defined by a first mold part at an end of a pivotable mold carrier and a confronting mold plate. A molded sole welt closed on itself is formed on a last supported shoe upper by injection molding plasticized thermoplastic material into a sole welt mold cavity defined by an opposed pair of first lateral mold elements closed against the shoe upper while a second mold part at an opposite end of the mold carrier confronts the shoe upper and the lateral mold elements. The mold carrier is shifted away from the lateral mold elements and pivoted to confront the first mold part and the molded outer sole to the shoe upper. An inner sole mold cavity is formed with the molded outer sole by closing an opposed pair of second lateral mold elements located between the first lateral elements and the first mold part.

Abstract: A device for preparing a chemically reacting mixture and for ejecting the mixture into a mold, the mixture comprising at least two components, in particular a mixture of isocyanate and a polyol that reacts completely to form polyurethane, the device having a mixing head with an outwardly opening bore, and a reciprocable ram coupled to the head. The ram has an ejector rod axially movable in the bore for therewith defining a mixing chamber and for ejecting the mixture from the chamber. The head has inlet passages for inletting the components into the chamber for preparing the mixture. The mixture head has another bore extending perpendicular to the bore in which the rod slides, and a ceramic body is located in the other bore for stripping off a film of the mixture from the rod during its axial return movement.

Abstract: A device for preparing a chemically reacting mixture and for ejecting the mixture into a mold, the mixture comprising at least two components, in particular a mixture of isocyanate and a polyol that reacts completely to form polyurethane, the device having a mixing head with an outwardly opening bore, and a reciprocable ram coupled to the head. The ram has an ejector rod axially movable in the bore for therewith defining a mixing chamber and for ejecting the mixture from the chamber. The head has inlet passages for inletting the components into the chamber for preparing the mixture. The ram is coupled to a rotational drive for rotating the rod about its longitudinal axis continuously during the preparation of the mixture to avoid any adherence of the mixture to the rod and/or to the wall of the bore. Alternatively, the rod may be oscillated about its longitudinal axis, or along its longitudinal axis.

Abstract: A process for molding an outer sole of elastomer and an inner sole of a mixture of isocyanate and a polyol reacting into polyurethane to shoe uppers includes a vertically movable upper cross block supporting a pivotably mounted mold carrier with a heatable first mold part at one end for the molding of outer soles, and a lower, vertically adjustable cross block has a mold plate confronting the first mold part. The first mold part releases the molded outer sole on to the mold plate, the mold carrier is pivoted such that a cooled second mold part at the opposite end thereof overlies the molded outer sole which is then transferred to the second mold part, the mold carrier is again pivoted to confront the molded outer sole to a shoe last supported shoe upper, and an inner sole mold cavity is formed with the molded outer sole juxtaposed to the last supported shoe upper, and by an opposed pair of lateral mold elements closed about the shoe upper.

Abstract: An apparatus is provided for molding an article of footwear having an outer sole, a lateral sole and an inner sole, the outer and lateral soles being of an elastomer, and the inner sole being of a thermoplastic or a mixture of isocyanate and a polyol reacting into polyurethane. The outer sole and the inner sole are each injection molded from an elastomer and bonded at their common contact zone by full vulcanization. The outer sole and the lateral sole may each be of different elastomers. The outer sole and the inner sole are bonded together in the area of their contact zone via chemical bonds between the isocyanate and reactive end-groups of substances added to the elastomer.

Abstract: The last for a shoe shaft includes a groove which, in cross section, has a generally T-shaped configuration, a profile band mounted in the groove and which, in cross section, also has a generally T-shaped configuration, and a plurality of springs for biasing the profile band such that a stem part thereof is biased towards the mouth of the groove where the inlet portion thereof opens onto the surface of said last, the stem part contacting the shoe shaft opposite where the sealing edges of cooperable lateral mold parts will contact the shoe shaft when molding a sole to the shoe shaft. As a result, sole material is prevented from extruding past the sealing edges of the lateral mold parts onto the upper part of the shoe shaft.

Abstract: An apparatus for molding an outer sole of elastomer and an inner sole of a mixture of isocyanate and a polyol reacting into polyurethane to shoe uppers includes a vertically movable upper cross block supporting a pivotably mounted mold carrier with a heatable first mold part at one end for the molding of outer soles, and a lower, vertically adjustable cross block has a heatable plate in contact with the first mold part. The mold carrier is pivoted such that the heatable first mold part containing the molded outer sole forms a mold cavity for an inner sole together with laterally movable mold elements and a last supported shoe upper.

Abstract: A device for preparation of a chemically reacting mixture, and for ejecting the mixture into a mold includes a pair of slides having transverse through openings capable of being mismatched upon relative reciprocation, oscillation and/or vibration of the slides for dynamically setting the mixing pressure.

Abstract: An apparatus and process for molding an outer sole of elastomer and an inner sole of a mixture of isocyanate and a polyol reacting into polyurethane to shoe uppers includes a vertically movable upper cross block supporting a pivotably mounted mold carrier with a heatable first mold part at one end for the molding of outer soles, and a lower, vertically adjustable cross block has a mold plate confronting the first mold part. The first mold part releases the molded outer sole on to the mold plate, the mold carrier is pivoted such that a cooled second mold part at the opposite end thereof overlies the molded outer sole which is then transferred to the second mold part, the mold carrier is again pivoted to confront the molded outer sole to a shoe last supported shoe upper, and an inner sole mold cavity is formed with the molded outer sole juxtaposed to the last supported shoe upper, and by an opposed pair of lateral mold elements closed about the shoe upper.

Abstract: A device including an injection mold for the production of a boot from thermoplastic material, the boot having a boot shank of a color different from that of the shank flange and the outer sole, both of which have the same color, by molding the shank and then in a subsequent and simultaneous step, molding the upper shank flange and the outer sole onto the molded shank. The injection mold includes a last for fitting with a textile sock, a base stemple having a deadhead borehole for injection molding the outer sole, another base stemple having a deadhead borehole for molding the shank, and two sidepieces. The sidepieces having sliding elements and, in their closed position for molding the upper shank flange, accommodate at least one deadhead borehole which communicates with the deadhead borehole of the base stemple for the outer sole. The sliding elements cover the cavity for the upper shaft flange during the molding of the shaft and release it for the molding of the upper shank flange.

Abstract: A plastification cylinder of an injection molding machine includes an outside cylinder and an inside cylinder, the inside cylinder including heating elements and temperature sensors therearound and defining a screw antechamber at one end thereof, the outside cylinder being shaped so that the end thereof which surrounds the end of the inside cylinder that defines the screw antechamber is in a pressure fit contact with the inside cylinder while the other end of the outside cylinder is spaced away from the corresponding end of the inside cylinder, thereby providing an annular chamber therebetween. Connecting elements extending through the outside cylinder can be used to cause a fluid heating or cooling medium to flow through the annular chamber.

Abstract: Pulse conditioning device for electrically controlling valves in hydraulic control apparatus whereby a regulating signal is transmitted to the actuator of the respective electrically controllable valve. A filter is connected to the input side of an isolating transformer and a unidirectional rectifier is serially connected to an input side of the isolating transformer through the filter. An oscillator generates a sinusoidal output signal and a summing amplifier receives both the regulating signal and the sinusoidal signal to provide an output signal which is input to the unidirectional rectifier. To complete a modular pair of identical circuits for the control circuit, a second unidirectional rectifier is serially connected to a second filter and also connected to the output side of the isolating transformer.