Abstract: A mechanism for the clamping attachment of interchangeable injection molding dies to the die carrier plates of an injection molding machine featuring a plurality of clamping plungers in axial guide bores of the die carrier plates, each clamping plunger having a clamping nose engaging a clamping shoulder of an oversized back plate of the die half, clamping the latter against the die carrier plate, when it is forcibly retracted by means of a transversely guided wedge rod traversing the clamping plunger and driven by a hydraulic cylinder assembly in a self-locking taper drive configuration. The injection molding dies are insertable and removable in either a horizontal or a vertical direction.

Abstract: A proximity switch assembly with multiple interchangeable switch cores arranged in a row inside a switch housing in such a way that the sensor heads of the switch cores reach through sensor head bores into flush alignment with a sensor head wall, two bus bars which supply current to the switch cores being clamped between shoulders of the switch cores and the sensor head wall on opposite sides of the sensor heads and engaged by contact sleeves in the core shoulders, the bus bars being U-shaped and forming male contact prongs at their extremities. The switch housing has a fitting cover and flanges for mounting attachment in two different orientations.

Abstract: A mechanism for the program-controllable exchange of injection molding dies in the die closing unit of an injection molding machine, comprising a translation table with two die emplacements which are alternatingly movable into transverse alignment with the die clamping space, for horizontal transfer of a die assembly. The transfer movement is produced by a compact roller chain drive with drive pins engaging recesses in a drive rack. The die assemblies have standardized back plates for positioning and guidance of the die assembly by means of aligned guide faces on the translation table and on a guide shelf of the die closing unit. Each die emplacement has a separate drive rack which entrains a die assembly. The drive racks are restrained against movement, when outside the transfer position.

Abstract: A keyboard switch assembly comprising a plurality of keyboard switches arranged in a matrix of vertical and horizontal rows, the switches being surrounded by switch cell walls forming a touch-centering grid which, in turn, is surrounded by a front wall and a frame. The switches, supported on shoulders in the open switch cells, are connected to a printed circuit board by means of solder pins. The printed circuit board abuts against the lower extremities of the switch cell walls, being centered by the assembly frame.

Abstract: An adjustable exterior support and guide arrangement for the movable die carrier member of an injection molding machine consisting of two laterally spaced guide rails on the machine base with horizontally and vertically oriented runways engaged by correspondingly oriented vertical and horizontal recirculating roller tracks of a pair of guide bogies. Each guide bogie is adjustably, but not rigidly, connected to an inclined strut of the movable die carrier member and longitudinally entrained by means of a key pin of the inclined strut.

Abstract: A potentiometer drive for the displacement transducer of a reciprocating unit which uses a timing belt to drive the rotary potentiometer and where one belt pulley serves as a control disc to which the drive shaft of the rotary potentiometer is coupled in a direct rigid connection. The coupling connection is obtained by means of a coupling collet which clamps the end portion of the potentiometer drive shaft to a hollow hub of control disc and the latter to the inner races of two ball bearings. The potentiometer housing is blocked against rotation in a "floating" configuration, using a radial pin on the housing which engages a stationary retaining fork in such a way that only circumferential antirotation forces are transmittable to the potentiometer housing.

Abstract: A locking device for the pivotable tape cassette compartment of a magnetic tape apparatus comprising a radially open detent groove in the side wall of the cassette compartment and a cooperating detent pin on a radially movable spring-engaged detent slide. The release movement of this detent slide is obtained by means of a detent release button which is formed by a hinged integral wall portion of the flat front wall of the casing, the release button carrying on its inner side a cam protrusion in engagement with a cam follower on the detent pin. The casing of the unit and its chassis have snap-action mounting features.

Abstract: A mounting structure for the support of a granulate hopper on the injection unit of an injection molding machine by means of which the hopper can be selectively attached to a horizontally oriented injection unit and a vertically oriented injection unit, the structure comprising a vertical primary charge chute and an inclined secondary charge chute leading into the plastification cylinder, and a direct attachment of the hopper base formation to a primary horizontal mounting face of a horizontally oriented injection unit, or an attachment of the same hopper formation to the horizontal upper face of an inclined hollow adapter post aligned with the secondary charge chute of a vertically oriented injection unit. To the hopper is clamped a hopper base which is slidable on a transferrable horizontal guide plate.

Abstract: A structure supporting a hopper with granulate raw material on the injection unit of an injection molding machine, the structure featuring a conical lower section on the hopper with an adjoining hopper extension in the form of a cylindrical wall and a radial flange, the hopper extension being clamped between a hopper base and a clamping bell with a conical cavity. On the carrier bridge of the injection unit is mounted a horizontal guide plate which engages a guide groove in a flange of the hopper base, for transverse mobility of the hopper between the charge chute of the plastification cylinder and a discharge opening. A clamping lever serves to secure the hopper on the guide plate.

Abstract: In order to correct non-linearities inherently existing in the relation between the value of a hydraulic fluid parameter controlled by a proportional valve and an operating signal controlling the valve, in an arrangement in which the setting of the valve is controlled by effecting a comparison between the operating signal and a feedback signal representing the valve movement, a memory is provided to modify one of those signals prior to comparison in a manner to compensate for such non-linearities.

Abstract: A drive-reversing safety mechanism using a pivotable contact ledge on the leading edge of a mechanically openable and closable safety gate of an injection molding machine, the pivot axis being arranged at a flange corner of the safety gate, where the channel-shaped contact ledge engages the outside of the corner with a fillet of a ledge fold. An adjacent positioning flange of the contact ledge is yieldingly clamped to the safety gate by means of pins and compression springs. An actuator plate attached to the contact ledge cooperates with a switch controlling the safety gate drive.

Abstract: A safety cover assembly for the die closing unit of an injection molding machine having three jointly or separately openable safety gates on the front, top and rear of the unit supported in a cantilever-type guide arrangement on a U-shaped supporting frame, and a stationary cover assembly attached to the same frame and forming pockets into which the safety gates are retracted when opened. The supporting frame consists of three identical frame members, each carrying a safety gate and a gate drive in the form of a timing belt loop, as well as safety interlock switches and a safety interlock linkage for the operation of hydraulic and/or mechanical interlock devices. One frame member also carries a die displacement measuring unit.

Abstract: A valve adjustment unit for an electronically controlled hydraulic proportional-response valve comprising a proportional-response magnet unit, a coaxially connected electronic control unit, and an intermediate insulating spacer body surrounding the inductive coil of a displacement transducer. The magnet core of the transducer is carried by the push rod of the armature of the proportional-response magnet and arranged to move in the bore of an axial cover extension of the magnet unit housing which is open to the oil-filled armature displacement space. The transducer coil core is part of the electronic control unit, serving as a support for two circuit boards and as a cover for the control unit housing.

Abstract: A hydraulic actuator assembly for a push-type die closing unit of an injection molding machine capable of producing rapid die opening and closing movements with a small volume of pressurized fluid and an elevated die closing pressure in the closed die position, the assembly comprising a central power cylinder with a selectively bypassable power piston and two parallel, diametrally oppositely arranged single-acting travel cylinders. The low-pressure space on the forward side of the power piston is open to the pressure spaces of the two travel cylinders, and the total effective area of these pressure spaces is larger, by a relatively small amount, than the area of the high-pressure space to the rear of the power piston, said small amount determining the fluid volume necessary for the opening travel. A stationary plunger cooperates with a central bore in the rear portion of the power piston rod to produce a small pressure space for the closing travel.

Abstract: An apparatus for the production of marbled articles by injecting into the injection molding die of an injection molding machine two confluent streams of plastic raw material of different hue or color which are supplied from two injection units, via separate pulsation channels which open into a common nozzle channel, just ahead of the mold cavity. The plastic raw materials flowing in the two pulsation channels are subjected to an intermittant and alternatingly pulsating advance by means of feed thrust pulsation controls which generate an intermittant advance of the plastification screws of the injection units. At the junction between the two pulsation channels may be arranged a pulsation chamber with oppositely oriented material entry ports which are alternatingly closed by a reciprocating pulsating element which moves with the pulsating plastic streams.

Abstract: A mechanical interlock mechanism for the safety cover of the die closing unit of an injection molding machine which has an arresting rod attached to the movable die carrier frame and extending rearwardly through a stationary cylinder head plate, where an arresting unit encloses a pair of arresting jaws with attached cam followers. The latter are engaged by a control rod which is connected to the safety cover by means of a control linkage. The jaws are forcibly closed, in opposition to jaw opening springs, and butting of the arresting jaw ridges against the arresting rod collars is limited to one jaw only, as a result of an axial offset between the arresting jaw ridges, in connection with a certain minimal pitch of the arresting rod collars and a floating arrangement of the jaw closing assembly. The latter is spring-biased towards one side.

Abstract: A mechanical interlock mechanism for the safety cover of the die closing unit of an injection molding machine which has two arresting rods attached to the movable die carrier frame and extending rearwardly through a stationary cylinder head plate, where pairs of toothed arresting jaws are movable into and out of engagement with toothed surfaces of the arresting rods to block their advance, in response to an opening movement of the safety cover which, through two attached control rods, moves the arresting jaws by means of cam surfaces and cooperating cam followers and drive links.

Abstract: A hydraulic actuator assembly for use in the die closing unit of an injection molding machine, the actuator assembly having a large power cylinder and a smaller travel cylinder with a large power piston and a small travel piston on a common piston rod, and bypass channels in the power piston which are openable and closable by means of an annular valve plunger moving on a guide sleeve on the piston rod. The valve plunger and the guide sleeve have three stepped cooperating sliding diameters forming bypass opening and closing plunger pressure spaces. Hydraulic pressure is supplied to the two pressure spaces through bores in the piston rod.

Abstract: An adjustable weight-supporting guidance arrangement for the movable die carrier member of an injection molding machine, consisting of two laterally spaced guide rails on the machine base with horizontal and vertical guide tracks engaged by matching guide faces of two slide shoes which are adjustably clamped to inclined strut extensions on the bottom corners of the movable die carrier member. The positions of the slide shoes are determined by means of threaded adjustment members, in response to readings obtained by means of a concentricity gauge.

Abstract: A hydraulic drive for the die closing unit of an injection molding machine in which at least one power cylinder and power piston with a coaxially attached auxiliary cylinder opens and closes the molding die by executing the opening and closing travel with a differential piston action in the power cylinder and/or with the auxiliary cylinder, while valve-closable bypass channels in the power piston are kept open. The closing of these channels switches the drive from an accelerated travel mode to a high-pressure die clamping mode.An annular valve plunger cooperates with a valve seat on the power piston to open and close the bypass channels, several alternatives of guiding and hydraulically moving the valve plunger being contemplated.