Abstract: A BGA mould assembly which can facilitate high degree of control over the clamping force on BGA substrates of varying thickness. An Independent drive is provided for each of the dual in-line cavity bars which clamp the BGA substrates. The drive mechanism is a wedge press which includes a servo motor, and a linear-conversion mechanism coupled to the servo motor to convert the rotation motion of the motor to a linear movement. An input wedge is coupled to the linear-conversion mechanism such that the input wedge moves correspondingly with the linear movement of the linear conversion mechanism. An output wedge is coupled to the cavity bar and positioned such that a horizontal movement by the input wedge causes the output wedge to move downwards. A roller cage is provided at the top and bottom of the input wedge to reduce friction.

Abstract: In a control device for a motor-driven injection molding machine comprising a mold clamping system which comprises a servo-motor and a ball screw mechanism, the ball screw mechanism comprises a screw shaft and a nut for use in converting rotation of the servo-motor into rectilinear motion. The control device comprises a pattern generator for generating a set pattern for the clamping force. The mold clamping system generates a clamping force according to the set pattern and a maximum clamping force with the set pattern being determined to be larger than the clamping force that is generated by the servo-motor within predetermined ratings.

Abstract: There is disclosed a built-in motor type electric injection molding apparatus which can prevent a decrease in the output ratings of a metering motor and a injection motor and which enables the selection of optimal drive characteristics corresponding to the load thereof in use. In a metering stage, the metering motor is driven in order to rotate its rotor. The rotation produced by the metering motor is transmitted to a screw via a drive force transmission mechanism, so that the screw is retracted with rotation so as to meter resin. In an injection stage, the injection motor is driven in order to rotate its rotor. The rotational motion produced by the injection motor is converted into linear motion by a motion conversion mechanism, and the linear motion is transmitted to the screw, so that the screw is advanced so as to inject the resin.

Abstract: A dough press machine for flattening a quantity of dough usable as a crust for a food product such as a pizza pie. The machine has a vertically movable upper platen having a bottom surface and a lower platen having a top surface. The lower platen is movable from and to a position whereby the bottom surface of the upper platen and the top surface of the lower platen are substantially aligned with each other for vertical downward movement of the upper platen against the lower platen. The machine includes a sensor for detecting alignment of the lower platen with the upper platen such that the upper platen is vertically immovable when the lower platen is not in substantial alignment with the upper platen. Vertical movement of the upper platen is accomplished electromechanically with an electric thrust actuator in communication with the upper platen.

Abstract: An injection apparatus for an electric injection molding machine includes a drive unit case, a metering motor, an injection motor disposed to be coaxial with the metering motor, a first drive force transmission mechanism connected between the metering motor and a screw, being adapted to prevent relative rotational movement while allowing relative axial movement, a motion conversion mechanism for converting rotational movement to linear movement so as to advance the screw, a second drive force transmission mechanism for preventing relative rotational movement while allowing relative axial movement, and a third drive force transmission mechanism for preventing relative axial movement while allowing relative rotation. Since it is unnecessary to use timing belts for advancing and retracting movement and rotational movement of the screw, no noise is generated during drive, and maintenance and management are facilitated. In addition, accuracy in controlling the speed, position and the like of the screw is enhanced.

Abstract: An apparatus for producing continuous tortillas which includes a double-press system with three conveyors. The two presses are arranged in series to eliminate production gaps as the tortillas proceed into the oven. The structure of the second press is positioned higher than the structure of the first press so that tortillas formed from the second press can be deposited on the intermediate conveyor with tortillas formed from the first press, thereby providing a continuous supply of tortillas to the oven.

Abstract: A lower metallic die has a major surface for supporting a workpiece thereon. A ridgeline is formed on an end portion of the major surface and with which a bending portion of the workpiece is brought into contact. An upper metallic die has a plane surface rotatable in a bending direction of the workpiece to clamp the workpiece together with the ridgeline of the lower metallic die, thereby freely bending the workpiece at one angle of desired various angles. A rotation controller controls rotation of the plane surface of the upper metallic die, thereby rotating and positioning the plane surface at a position of the one angle of the desired various angles.

Abstract: A lower metallic die has a major surface for supporting a workpiece thereon. A ridgeline is formed on an end portion of the major surface and with which a bending portion of the workpiece is brought into contact. An upper metallic die has a plane surface rotatable in a bending direction of the workpiece to clamp the workpiece together with the ridgeline of the lower metallic die, thereby freely bending workpiece at one angle of desired various angles. A rotation controller controls rotation of the plane surface of the upper metallic die, thereby rotating and positioning the plane surface at a position of the one angle of the desired various angles.

Abstract: A method for detecting an abnormality of a hydraulic system in a molding machine which comprises a hydraulic cylinder for reciprocating a movable member of the molding machine, a valve for controlling a hydraulic fluid which is supplied into the hydraulic cylinder, and a pair of pressure sensors attached to the hydraulic cylinder, for detecting the pressures in a pair of pressure chambers of the hydraulic cylinder, is disclosed. The method comprises the steps of: holding the valve at a neutral position, and comparing the pressures in the pair of pressure chambers with a preset range of pressure on the basis of detecting signals from the pair of pressure sensors, when the movable member is inoperative; and outputting an abnormality signal when at least one of the pressures in the pair of pressure chambers is out of the preset range of pressure.

Abstract: Apparatus for stamping a pattern into bread doughs in which the dough is continuously conveyed in cups and is stamped by star shaped tips of pattern forming tools mounted to a stamping head. The stamping head travels in an elliptical path by virtue of a pinion ring assembly with supports for the stamping head mounted in positions offset from the center of a turret pinion that rotates as it orbits a turret ring. An eccentric pinion assembly controls the speed of the stamping head by controlling the speed of the turret pinion's orbit around the turret rings, so that the stamping head's speed is decreased to match the speed of the cups while dough stamping occurs, and its speed is increased during repositioning of the stamping head for the next set of dough-filled cups.

Abstract: A vertical press, which has replaceable mold components, has lifting devices for lifting and conveying these parts. The lifting and conveying devices are mounted on a movable topmost mold carrier element of the press, so that the drive and control devices of this mold carrier element (4), which are provided for the pressing process, can be utilized simultaneously for the vertical movement of the lifting and conveying devices. By a programmed control, the necessary movements to shape-specific intermediate positions and coupling and decoupling processes to be performed at these positions are programmed for a series of shapes and can be performed automatically.

Abstract: An apparatus for compressing a workpiece is disclosed. The apparatus has a die to receive the workpiece in powdered or other form. An abutment holds the workpiece in a fixed position against the application of force, while a hydraulic cylinder is positioned to exert force against the die in the direction toward the abutment. A pump feeds hydraulic fluid to the hydraulic cylinder, and a pressure control valve is coupled to the hydraulic cylinder to control the maximum pressure in the hydraulic cylinder. The pressure control valve has a sealing member, a seat which engages the sealing member with the sealing member closing the outlet, a spring which urges the sealing member towards the seat, closing the outlet, and a backing member putting the spring under compression by maintaining a distance between the backing member and the seat. A stepping motor is rigidly mounted with respect to the seat.

Abstract: The invention relates to powder metallurgy. The invention involves deforming combustion products by extrusion at an extrusion temperature chose in the range from 0.3T.sub.1 to T.sub.2, wherein T.sub.1 is the melting point of a hard phase of the combustion products and T.sub.2 is the melting point of a binder material in a container (5) made up of vertically extending segments (12) defining spaces (13) with one another and having a die (14) and a heat insulated sizing member (17) the temperature conditions of extrusion being controlled by a unit (21) having a temperature sensor (22) and a member (23) receiving information from the sensor (22) and sending a command for moving the punch (10).

Abstract: A mold press assembly has an outer press frame carrying first and second inner frames that are interlocked to the press frame during relative vertical movements of an upper platen and a lower platen for defining a throat distance for receiving mold parts connected thereto and the first and second inner frames connect on first and second drive shafts for pivotal booking movement. The shafts are connected at one end to an electric motor and connected at other points therealong to ball screws for vertically positioning an upper platen with respect to the outer press frame and for reciprocating the lower platen outwardly with respect to the pivoted second inner frame; and the first and second inner frames are driven by other ball screws and electric motors to pivot about the first and second drive shafts for providing access to mold parts connected to the upper and lower platens.

Abstract: A mold opening controller for injection molding machines, having a control unit for controlling the hydraulic circuit. The control unit having a setter for setting acceleration/deceleration functions of a movable portion such as the movable mold; a data input for the setter; an operational unit for calculating the acceleration/deceleration of portions of the movable mold and the acceleration/deceleration speeds at each moving position at the time of the acceleration/deceleration on the bases of data from the setter and the data input; a position sensor for detecting the moving position of the movable mold; and a control for controlling the hydraulic circuit so that acceleration/deceleration positions of the movable mold and its moving speed at each position correspond to the output values of the operational unit through the position sensor.

Abstract: An improvement in a dough ball pressing apparatus in which the continuous conveyor belt is provided with metal strips at predetermined spaced locations along each edge of the conveyor belt and a pair of proximity switches are positioned on the apparatus adjacent the edges of the conveyor belt for detecting the metal strips. The proximity switches cause the belt driving mechanism to stop upon detecting a metal strip for precisely locating the belt and controlling the distance of travel in each cycle. The conveyor belt is provided as a flat length with ends that are realeasably connected by a pin for allowing easy installation of the belt without disassembling the belt drive mechanism.

Abstract: An apparatus for compressing a workpiece is disclosed. The apparatus has a die to receive the workpiece in powdered or other form. An abutment holds the workpiece in a fixed position against the application of force, while a hydraulic cylinder is positioned to exert force against the die in the direction toward the abutment. A pump feeds hydraulic fluid to the hydraulic cylinder, and a pressure control valve is coupled to the hydraulic cylinder to control the maximum pressure in the hydraulic cylinder. The pressure control valve has a sealing member, a seat which engages the sealing member with the sealing member closing the outlet, a spring which urges the sealing member towards the seat, closing the outlet, and a backing member putting the spring under compression by maintaining a distance between the backing member and the seat. A stepping motor is rigidly mounted with respect to the seat.

Abstract: An apparatus and method for controlling an injection molding device having a mold cavity therein use of periodically generated signals representative of the mold cavity pressure and mold cavity volume. These signals are used to control the magnitude of the clamping force imposed on a movable mold member. During a first time period following closure of the gate, in response to the signals representative of cavity pressure and cavity volume, the clamping force imposed on the movable mold member is adjusted to maintain, in closed loop fashion, cavity pressure constant. During a second time period following closure of the gate, in response to the signal representative of the cavity volume, the clamping force imposed on the movable mold member is adjusted to maintain, in closed loop fashion, cavity volume constant.

Abstract: This invention is a novel mold-pressing apparatus for molding and pressing a material, which is provided with an electric servo motor and a pair of linking mechanisms. The electric servo motor drives the mold-pressing apparatus and rotates itself in the normal and inverse directions. The electric servo motor is numerically controlled. The driving force from the electric servo motor is transmitted to the pressing mold via the linking mechanism by a rotation to reciprocation conversion assembly. By virtue of the provision of these, the mold-pressing apparatus can very easily and effectively secure the applicable pressure and adjust the pressure-applying speed, stroke of the pressing mold, and the pressing time so that the mold operator can create a comfortable environment and improve overall efficiency of the pressing operation.

Abstract: A plastic molding device for a semiconductor element for plastic molding a semiconductor element on a lead frame, which comprises: an upper platen, a lower platen, and a movable platen movably provided at a tie bar which is provided between said two platens; an upper metal mold and a lower metal mold provided at the upper platen and the movable platen, respectively; a motor for applying a raising force for driving the movable platen; a driving force conversion mechanism for converting the rotation force of the motor into a reciprocative force; and a double toggle mechanism for giving the reciprocative force to the movable platen.

Abstract: Apparatus for "forming" (reshaping) plural dough balls on a conveyor including means for arranging the balls in a desired order on the conveyor. Included is a transfer conveyor with reciprocative end portion and funnel type means cooperating with ring means above a second conveyor for facilitating arranging the balls on the second conveyor and controls for the apparatus.

Abstract: A method and apparatus for automatically setting the die height platen on a toggle-operated injection molding machine to achieve a desired mold clamping force. A control is provided and contains information relating a desired clamp tonnage with a toggle crosshead displacement, in order to permit setting the die height platen for a particular set of molds so that the clamp, when operated, will automatically provide the desired clamping force between the mold members. The adjustment is provided by moving the die height platen in response to deviations from a predetermined set of conditions, the die height platen being moved by an hydraulic motor and chain drive to shift the die height platen along guide rods that extend between the die height platen and a stationary mold platen.

Abstract: The present invention relates to a method and apparatus for the manufacture of finished parts by the sintering of compacts which are formed as composite moldings of a pulverulent base material and at least one other pulverulent material, particularly different metal powders. The compacts are produced in the manner that at least one of the powder materials is introduced in pourable condition directly alongside of an already pre-compacted part of the compact into the mold which has a shell-shaped matrix and the powder materials are subjected together to final compacting by plug forces acting from on top and on bottom to the size desired for the sintering.

Abstract: An adjustable powder compacting device for compacting a powder such as a cosmetic powder includes a control unit which electrically monitors and controls a hydraulic ram operated punch to compress the powder into a cup. The control unit causes the punch to perform: an approach stroke with a first regulated preset punch speed until the punch contacts the powder and exerts a first pressure on it, a debubbling stroke with a regulated second preset punch speed until the pressure exerted by the punch reaches a second preset pressure, and a compacting stroke at a constant third preset pressure for a preset period of time. These preset speeds and pressures are easily adjusted so that proper evacuation of gases from the powder and optimal compacting is readily achievable when the consistency of the powder changes. In specific embodiments, the device includes a rotatable disc for causing successive volumes of non-compressed powder to be compressed by the punch.

Abstract: A mold clamping pressure control method for injection compression molding through adjustment of the oil pressure in the mold clamping cylinder by the mold clamping cylinder control valve, wherein a resin temperature in the mold is detected by a resin temperature sensor, and detected values thereof are converted by a converter into electric signals, which are in turn compared with a series of the preset pressure changeover temperature setting values to output pressure changeover signals whenever the detected values correspond to the preset values. The pressure changeover signal selects any of a series of the preset pressure setting values to output the valve opening-shutting directing signals converted into a certain valve opening-shutting amount, thereby to control the opening-shutting amounts of the mold clamping pressure control valve.

Abstract: Molding apparatus, particularly for mounting specimens for microstructural analysis. A ramhead pressurizes a molding chamber, with the pressure, temperature and time of the cycle being set into the system from a control panel and proceeding automatically. The ramhead is advanced through a hydraulic system. A spring is provided for mounting the tubular molding chamber to permit the molding chamber to spontaneously align with the advancing ramhead. A wrench member is provided as an integral part of the apparatus to rotationally lock the handle to the molding chamber, to permit rotation of the molding chamber through the handle for removal thereof when desired.

Abstract: A press is described which is particularly suitable for the production of precision moldings from pulverized materials. The press is provided with a frame 3 in which a draft frame 5 and a platen 4 acting together provide the axis, and are connected to one another by means of a mechanical drive, preferably a toggle drive system, for relative movement to form a main press ram. In the main press ram, between the movable draft frame 5 and the platen 4, a hydraulic subpress 12 is arranged together with at least one additional axis, preferably however with several such axes. Control and regulation of the timing and extent of the working movement of each axis in the hydraulic subpress 12 are made to depend, through a control system 22-33, on the working movement of the main axis formed by the draft frame 5 and the platen 4 of the mechanical press 2.

Abstract: A press has upper and lower platens which can be moved towards and away from one another. Four hydraulic leveling cylinders are mounted in a vertical orientation on the lower platen for purposes of platen parallelism control. In preferred form, each cylinder has a piston rod which engages an associated post on the upper platen as the platens approach one another. The piston rod and associated piston are formed with a longitudinal bore open at the upper piston rod end, and a rigid shaft is mounted in the bore with a lower end extending through the bottom of the cylinder housing. A coil spring in the interior of the piston rod urges the rigid shaft upwardly until a collar formed on the shaft engages a stop surface, the upper shaft end then being flush with the upper piston rod end. The associated post is fixed to the upper press platen in-line with the piston rod and has an internal passage in which is located a stud-like shaft that engages the rigid shaft mounted in the piston rod.

Abstract: Disclosed is a control method in which control errors, attributable to a change of the state of a transmission mechanism, disposed between a servomotor and a load driven thereby, are reduced in controlling a driving force to be applied to the load.A detected value (PH) of the driving force applied actually to the load is compared with a set value (PL') of the force to be applied to the load. The driving current of the servomotor is controlled in accordance with the result of such comparison. Thereupon, a change of the correlation between the servomotor output and the driving force applied actually to the load, which is attributable to the change of the state of the transmission mechanism, is compensated automatically. Thus, the driving force applied actually to the load is adjusted accurately to the set value.

Abstract: A plastic molding device for a semiconductor element for plastic molding a semiconductor element on a lead frame, which comprises: an upper platen, a lower platen, and a movable platen movably provided at a tie bar which is provided between said two platens; an upper metal mold and a lower metal mold provided at the upper platen and the movable platen, respectively; a motor for applying a raising force for driving the movable platen; a driving force conversion mechanism for converting the rotation force of the motor into a reciprocal force; and a double toggle mechanism for giving the reciprocal force to the movable platen.

Abstract: A mold opening/closing speed control device wherein an opening/closing speed switching position for molds in a mold clamping unit in an injection molding apparatus can be taught by the control device. The control device is set in a teaching mode (101), a servo motor (M) is driven at a low speed to move (102) the molds, speed switching positions P1, P2 and P3 are stored (103, 104, 205, 106, 109) by a teaching device, and the opening/closing speed control of the molds is performed (110, 123) by the servo motor in accordance with the stored positions.

Abstract: A three station turret-type apparatus is provided with a first station including structure for receiving a quantity of soil to be compressed into a building block, a second station for compressing the soil into the desired building block and a third station for ejecting a formed building block from the apparatus. A rotary table is equipped with peripherally spaced sleeves for successive registry with the three station positions and each sleeve comprises a mold in which the desired block is to be formed. The sleeves are removable and replaceable and one form of sleeve is constructed to have an auxiliary smaller plan area sleeve removably mounted therein. Further in the second station position, a stationary bottom plate closes the lower end of the sleeve registered therewith and the bottom plate faced with a urethane elastomer material. A pressure head opposes and is movably toward and away from the stationary plate and is faced with a similar urethane elastomer material.

Abstract: A press for forming sheet material into a shaped article comprising a frame, first and second complementary dies, a cam supported by the frame for reciprocally moving the first die along an axis between a first position axially spaced from the second die and a second position fully mated with the second die, the cam including a dwell period when the first die is in the second position. The press includes a bolster supporting the second die for axial movement between upper and lower limits, the bolster being axially spaced from the upper limit by movement of the first die to the second position. The press also includes a hydraulic power circuit responsive to the position of the cam for normally biasing the bolster toward its upper limit under a first hydraulic pressure and for biasing the bolster toward the upper limit under a second hydraulic pressure during the dwell period, the second hydraulic pressure being greater than the first hydraulic pressure.

Abstract: A contact sensing system senses the contact of two parts, such as the closure of two die parts in a molding machine, and controls a subsequent event such as the introduction of fluent molding material into the mold when closure of the die parts is sensed. One of the die parts is provided with an orifice which is covered by the other die part when the mold is closed. Sensing is achieved by delivering air through the orifice using an air line and sensing the pressure increase in the line when the orifice is closed by the other die part. A control module houses the components of the sensing system and protects the components in hostile environments.

Abstract: A hydraulic press for non-refractory material consisting of a rigid framework and a vertically moveable press pad and horizontally moveable box section. A mold cavity is defined within framework and the press pad is contained within. Moveable box section delivers stock to mold cavity, forms cover over mold cavity during manufacture, and ejects formed unit from framework. A hydraulic cylinder is provided for movement of press pad during compression of unit and to raise unit for ejection from framework. A separate hydraulic cylinder is provided for movement of box section through framework. Both cylinders are fixedly connected to the framework. Hydraulic fluid, directed by solenoid-activated valves, provides movement of cylinders. Control means include an electrical circuit using relays, timmer, pressure actuated valve, and mechanical trip switches.

Abstract: This invention relates to safety devices built into a machine designed to press a ball of dough into a pizza crust of uniform predetermined size.

Abstract: A hydraulic press of the type having first and second oblong side plates joined at upper and lower ends thereof to form a structure supporting upper and lower hot plates and injection molding equipment in which one of the side plates includes channels formed in its interior for conveying hydraulic fluid from a source of fluid under pressure, through valves mounted on the side plate, to and from the hydraulic equipment, and back to a reservoir.

Abstract: An improved portable shower and bath mat including a non-absorbent mat having a non-slip bottom surface and having a channeled bottom surface and a plurality of drain holes through said pad to permit water to drain through said pad to the channels in the bottom surface of said pad and into the shower or bath drain.

Abstract: An illustrative embodiment of the invention extrudes dough through two hoppers. A cutting wire severs the extruded portions of the dough from the extrusion hoppers after a predetermined delay. The extrusion press, moreover, is of intermittent action in response to the quantity of dough extruded from the hoppers. Safety interlock switches associated with the apparatus housing automatically deenergize the apparatus.

Abstract: A hydraulic press for refractory material including a mold box rigidly supported by a press frame. A lower plunger assembly positioned below the mold box and includes a lower crosshead and at least one plunger adapted to extend upwardly into a vertical mold cavity in the mold box. An ejection cylinder assembly supported by the press crown is provided for causing selective vertical movement of the lower crosshead. An upper plunger assembly is positioned above the mold box and includes an upper crosshead and at least one upper plunger supported by the crosshead and adapted to extend downwardly into the mold cavity. A hydraulic cylinder is provided for supporting the upper crosshead for vertical movement with respect to the mold box and the lower crosshead. The hydraulic cylinder is fixedly connected to the lower crosshead, and a ram is housed in the cylinder and adapted to selectively drive the upper crosshead downwardly.

Abstract: In a machine for molding or forming dough pieces, particularly kaisersemmels oder starsemmels, a molding tool carrier is mounted for upward and downward movement in a frame. The molding tool carrier carries at least one molding tool, particularly a pestle for forming the upper surface of the dough piece resting in a hollow of a molding dish. In order to avoid that due to dough adhering to the molding or forming tools dough pieces are placed one upon the other in the molding dish so that by the excessive amount of dough expelled by the molding tool damages in the machine occur, a sensor means is provided for supervising the neighborhood of those zones of the molding dish in which the dough is expelled during normal operation of the machine. If the sensor means senses excessive amount of dough, the drive means for the upward and downward movement of the molding or forming tools is disconnected, preferably the drive motor is shut off from the electric power supply.

Abstract: This core puller assembly includes a bank of interconnected core puller units each having a cylinder, and a piston mounted within the cylinder and having a rearwardly extending connecting rod. Each core puller unit includes a core puller bar disposed in side-by-side relation below the cylinder and connected to the piston connecting rod for movement with said connecting rod. Each cylinder carries front and rear guide units receiving the core puller bar in sliding relation to guide the core puller bars into the mold assembly.The cylinders are operated by a pneumatic air supply which includes a surge tank and a control system for controlling the supply of pressurized air to the cylinders.

Abstract: A press for compressing pulverulent materials into both concave and convex pieces includes a press frame, a die carying plate, upper and lower punches, holders for carrying the punches and control devices for controlling the displacement of the upper and lower punches. The press comprises also a first piston-cylinder device for controlling the displacement of the die carrying plate, a second piston-cylinder device fastened to the frame and supporting the die carrying plate, levers arranged above the die carrying plate and having one end pivoted to the frame and sliders slidable on the opposite ends are provided in the press. The first piston cylinder device acts on the other ends of the levers to exert thereon a pressure depending on the distance of the sliders from the other ends of the levers.

Abstract: An apparatus for the mass-production of medical tablets wherein interfacial friction between the tablets and the die and punch is prevented by supplying a powdery lubricant in the die cavity, and dispersing the lubricant under compressed air within a confined space including the die and punch thereby to cover the same with the lubricant dust, and charging the die cavity with a material to be molded.

Abstract: A structure for measuring the load imposed on mold halves in a plastic injection molding machine when engaged to define a mold cavity, the machine being of a type wherein a movable die platen is driven along supporting tie rods to carry one mold half toward and away from a fixed die platen carrying the other mold half. The measuring is accomplished by a sensor engaging one end of one tie rod to sense any movement thereof under an imposed load condition.

Abstract: A flywheel and screw press for compacting a ceramic powder includes a base, a fixed press member disposed at a spaced location above the base, a beam movably located in the space between the base and the fixed press member, and a plurality of hydraulic piston members mounted to the base and the fixed press member for variably controlling the compaction of the ceramic powder.

Abstract: A control circuit for controlling either the position and the speed of travel of a press table or the hydraulic pressure acting on the press table, or both, in a hydraulic press, in particular a press for wood-based boards, comprising an actual-value transmitter for the position of the press table, a pressure transmitter for the hydraulic pressure in the hydraulic press cylinder, a set point transmitter, and a control valve, actuated by the deviation of the actual value from the set point value, for the hydraulic cylinder by means of which the press table is moved. In order to produce a simple and inexpensive control circuit compared with conventional control circuits, in which the control valve is a complicated and expensive servo valve, the control valve is a pressure controlling proportional valve and the circuit can be designed to provide an arbitrary, e.g.

Abstract: Pellet molding apparatus for molding pellets from a powder material which includes a rotary index table upon which are placed a plurality of hollow cylindrical mold members spaced at equal radial and arc distances one from another. A mold filling station assembly is provided to fill the molds and a vertically operating hydraulic press at a pressing station compresses the powder in the cylindrical molds into pellets. A pivoted mold bottom operates upon a cam surface to maintain the bottom ends of the molds closed through the filling and pressing stations and swings open at an ejection station. An ejection station is provided and includes rams operating through the top of the mold member to force the compressed pellet out of the mold member through the open bottom end of the mold member.

Abstract: A coiled roll of film, which exhibits curling, is provided with longitudinal corrugations at its leading edge by a film processing apparatus, thereby providing a straight film edge well adapted for insertion into a film development machine without requiring the use of a separate leader. In the film processing apparatus, which comprises a pair of grooved, horizontally opposed platens which, upon insertion of a film therebetween, contact each other, impressing corrugation into the film, and then automatically retract to permit removal of the worked film edge from between the platens, a safety switch is provided to enable retraction of the platens, should automatic retraction not occur, to assure that the film end may be removed from the apparatus after it has been worked without being damaged.

Abstract: A control system for controlling a molding machine used for exothermic curing senses the rate of change of the temperature of the material in the mold. When the rate of change of temperature has first exceeded and then fallen below a predetermined reference level, it is determined that the exothermic curing reaction has been completed, and the mold is opened after a predetermined delay.