Abstract: A pressure transducer for an injection molding machine includes a housing coupled to a nozzle of an injection molding machine. A hollow stress tube, attached to the housing, through which molten material of the injection molding machine flows, bellows in response to pressure from the material. An outer ring having an opening is coupled to the stress tube such that the outer ring expands, causing displacement of the outer ring about the opening, when the stress tube bellows. A displacement sensor is included for determining the displacement of the outer ring about the opening. This displacement is directly proportional to the pressure of the material. In this manner, the pressure transducer determines the pressure of the molten material.

Abstract: A source of radio frequency energy is applied to a low thermal inertia heating element with high thermal conductivity, such as a spool, for rapidly heating the heating element to settable predetermined temperature, which temperature is maintained essentially constant. The heating element is detachably attached about the die of a mold for transferring heat to the die to form, mold, weld or extrude thermoplastic material placed within the mold. Thermal chokes restrict heat transfer from the die to the remainder of the mold. One or more heat sinks draws and dissipates heat from the thermal chokes to maintain cool zones of the mold. Following the heating cycle, upon termination of application of radio frequency energy to the spool, cooling may be accelerated by directing a stream of gas upon the heating element.

Abstract: A light weight extruder (20) is suitable for high production, in-line extrusion of flowable materials with high precision in the placement and control of the extruded material. The extruder uses a high torque hydraulic motor (72) to drive a feed screw (88) in dispensing highly viscous but flowable material through an extrusion die (126) of preselected configuration. A plurality of heating bands (114-118) surrounding the barrel (86) of the extruder provide precise control over the material temperature at the point of extrusion. In an alternate embodiment, an injection nozzle (120a) is provided with a plurality of independently controllable extrusion dies (128, 130, 132). The extruder is sufficiently light and manipulable such that it can be mounted on the end of the arm of a robot (122).

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 operating time analyzing apparatus capable of automatically determining, storing, and analyzing the operating time of an injection molding machine for each operating condition. This apparatus detects the operating conditions of the injection molding machine through internal processing with a PMCCPU 14 for the sequence control of the injection molding machine. While specific operating conditions are detected, fine times .DELTA.t, execution cycles of the internal processing, are added in succession. By doing this, integrated time for each operating condition, that is, operating time for each operating condition, is calculated. This operating time is stored in a nonvolatile RAM 8 for each operating condition of the injection molding machine through the processing by the PMCCPU 14.

Abstract: A vacuum sizing apparatus with a controlled vacuum is provided. The vacuum is precisely controlled by the use of a variable speed motor driven vacuum pump and a step motor controlled vent valve. An electrical circuit containing a microprocessor coordinates the speed of the motor driven vacuum pump with the position of the vent valve to give precise vacuum control within the vacuum chambers of the sizing apparatus. A closed sump tank contains water for the water system of the apparatus and is maintained at the same vacuum level as the vacuum chambers within the sizing apparatus.

Abstract: An extrusion head for sheathing elongate objects such as cables has a housing with an elongate bore in which there is a hollow mandrel through which is passed the object to be sheathed. At the discharge end of the mandrel there is a forming tool made up of an annular forming tool part on the mandrel and a concentric forming tool part at the adjacent end of the bore of the housing. An extruder connected to the extrusion head housing forces sheathing material into the bore of the housing and out through the forming tool to form a sheath on the cable or other object as it is passed through the hollow mandrel. A rotor which is rotatable on the mandrel has a screw thread web of decreasing height for propelling sheathing material toward the forming tool. There are lubricated radial seals between the rotor, mandrel and housing. For applying a double layer sheath, there are two entrusion heads interconnected one behind another and supplied with sheathing material by two extruders.

Abstract: A moldable material, which either has dipoles or other charged particles therein, or is susceptible to their creation, is introduced into a mold or is passed through a die. The material is then subjected to a polarization medium until either at least some of the dipoles or other charged particles are oriented in the direction of the polarization medium, or until at least some dipoles or other charged particles are created thereby. Thereafter, the material is permitted to cool. Once cooled, the molded material is separated from the mold or die. The effect of polarizing the moldable material is then analyzed by permitting an at least partial relaxation of the dipoles or other charges therein which were polarized or created. This relaxation results in a measurable current which is related to the actual temperature of the material at the time the polarization medium was applied.

Abstract: A rotational moulding apparatus includes a device (5) disposed inside the mould for measuring temperature. A processor (6) forming part of a feedback tool (7) enables real time monitoring and control of the moulding process. Identifiable points on the temperature time moulding characteristic are employed to control the operation of the apparatus to optimise the properties of the mouldings obtained.

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 monitoring method capable of properly collectively managing the operating states and operation records of a group of injection molding machines. Monitor data sets delivered from the individual injection molding machines are cyclically detected by means of a processor of a monitor unit, and a plurality of sets of up-to-date monitor data for the individual injection molding machines are renewably loaded into a plurality of data tables. When the preset time of a timer associated with any one of the injection molding machines is up, or when the current injection frequency reaches a predetermined frequency, it is concluded that the monitor data output timing is reached, and whether the monitor data should be printed or displayed on a screen is further determined.

Abstract: A method of controlling the extrusion of a multilayer parison so that the injection pressure for an auxiliary resin and that for an adhesive do not act on the annular fluid passages while a main resin, an auxiliary resin and an adhesive are stored in a main resin accumulator, an auxiliary resin accumulator and adhesive accumulators, respectively. The injecting pressure difference between each pair of auxiliary resins and the adhesive is maintained within a prescribed range and the injection of the resins and the adhesive from the accumulators is terminated simultaneously for all the materials.

Abstract: Device to collect and convey plastic strands, issuing from nozzles, on a discharge plate, over which cooling water flows, with a device to indicate the undisturbed passage of the plastic strands over the discharge plate or their accumulation on the discharge plate. At least one temperature-dependent electric resistor, which triggers a signal by way of a threshold value switch when the specified temperature is exceeded, is attached to a cooling water-free zone on the underside of the discharge plate in the region of impact of the plastic strands.

Abstract: A colored resin molder having a cylindrical input member, a resin material supply mechanism for storing a molding resin material having thermoplastic properties and supplying the stored resin material through the input member, a coloring agent supply device having a nozzle discharge end disposed in the input member for supplying a liquid coloring agent, a feeding mechanism for feeding the resin material from the resin material supply mechanism while mixing the coloring agent with the resin material for resin molding, a sensor device for detecting the status of the feeding by the feeding mechanism, and a control unit for controlling the operation of the coloring agent supply device according to the result of the detection by the sensor device.

Abstract: An injection molding machine including a guide coupling for transmitting linear movement to a screw, a screw coupling for transmitting a rotary movement to the screw, a washer-type load cell, disposed between the guide coupling and the screw coupling, for detecting a pressure applied to the screw coupling, and a transmission link having one end thereof coupled to the screw coupling so as to be rotatable relative thereto and axially fixed relative there. The transmission link rotationally fixed relative to the guide coupling.

Abstract: An injection molding machine includes a guide coupling for transmitting a linear movement of a ball screw mechanism, and a screw coupling for transmitting rotary movement. A washer-type load cell including an inner tubular portion having first and second ends, an outer tubular portion, and an intermediate distortion portion, is positioned between the guide coupling and the screw coupling to detect a pressure applied to the screw coupling. The inner tubular portion of the load cell and a pair of bearing portions positioned at the first and second ends of the inner tubular portion are secured to the screw coupling by a bearing nut, and the outer tubular portion of the load cell is secured to the guide coupling. This arrangement allows screw pressure to be applied to the inner tubular portion through both the screw coupling displacing relative to the guide coupling and the bearing portion, while the outer tubular portion is positioned-regulated by the guide coupling.

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: A product acceptance/rejection judgment method in an injection molding machine, which makes it possible to properly and quickly set judgment standard parameters and accurately judge whether a product is acceptable or not. Based on injection pressures and screw positions periodically sampled during each of a plurality of injection processes in nondefective product molding, an injection pressure curve group represented as a function of the screw position and an injection pressure curve group represented as a function of the time period elapsed from the start of injection are displayed on two coordinate systems (6, 7) on a display screen.

Abstract: A low cost crank operated injection apparatus is capable of driving an injection screw with a desired driving force without the need of employing a high output type electric motor. The injection apparatus includes a crank mechanism for converting forward and reverse rotation of a driving shaft into reciprocating motion of an injection screw mounted on a pusher plate. The driving shaft is coupled through a reduction gearing unit to the power output shaft of a servomotor controlled by a numerical control device, and the apparatus operates, during the injection process, so as to cause the injection screw to move forwardly with a great driving force.

Abstract: An injection/hold pressure control apparatus which permits the production of high-quality molded articles without the need of using an expensive internal mold pressure sensor. When a plurality of points specifying a target injection/hold pressure curve represented as a function of the time period elapsed after the start of injection are manually input in succession, a processor (109) of a numerical control unit (100) calculates a group of target injection/hold pressure data on the basis of the target pressure curve drawn on a screen of a display unit (113), and stores them in a lookup table in a shared memory (102). Upon start of the injection, a comparator (11), connected to a pressure sensor (4) mounted on an injection screw (1) for detecting an actual injection/hold pressure, is connected to the numerical control unit through a first changeover switch (6).

Abstract: An injection apparatus of an injection-molding machine is described, including a servomotor for screw rotation including a pulse coder, the motor being driven in accordance with the difference between a command output from a control section of the injection-molding machine and an output from the pulse coder, thereby rotating a screw. During injection and pressure hold processes in which the motor is rendered nonoperative, the screw rotates as molten resin flows backward, if a check valve attached to the screw does not function normally, and this situation is detected as an abnormality of the check valve by a control section.

Abstract: An extruder temperature controller for an extruder barrel and a method for controlling the temperature of an extruder barrel, includes a device for determining an actual screw speed and for storing a plurality of screw speeds. Each member of the plurality of stored screw speeds has a corresponding stored temperature reset value. The extruder temperature controller has a device for comparing and selecting that compares the actual screw speed to each of the plurality of stored screw speeds and selects a default screw speed. The default screw speed has a smaller deviation from the actual screw speed than any other member of the compared, stored screw speeds. The controller further includes a device for generating a control output driver signal to a heat exchanger. The control output driver signal is the corresponding stored temperature reset value for the default screw speed.

Abstract: A measuring device for enabling an evaluation of a moldability of a thermosetting resin by determination of parameters suitable for high accuracy forecasting of flow and curing behaviors of the thermosetting resin within a metal mold, as well as a metal mold for molding a thermosetting resin and method for constructing runners of the metal mold which is effective to minimize if not prevent the occurrence of false in moldings. By utilizing unique or peculiar parameters of the thermosetting resin which are not influenced by a molding condition and by conducting a flow simulation with a metal mold having a flow passage of arbitrary dimensions using the determined values for the parameters, a forecasting of a flow in an actual metal mold is enabled so as to preselect optimum molding conditions and flow passage dimensions for a metal mold.

Abstract: A single facer comprises an apparatus for automatically adjusting a gap between rolls, i.e., an apparatus for maintaining a roll gap constant. The apparatus for adjusting the distance between the centers of the roll shafts is operable to move one roll toward the other by actuating driving means. The driving means is controlled in response to the variation in the temperature of the frame which supports the driving means of the roll in place, or to the passage of time after a heating mechanism for heating the rolls has started operation.

Abstract: Biaxially stretched thermoplastic tubes are made in an apparatus having a plastic extruder, the output of which is controllable on an open-circuit or closed-circuit basis and which has a too head for the extrusion of a highly viscous exiting tubing, a stretching mandrel and a speed-controllable draw-off device. In the region of the run-on part there is disposed a surrounding temperature control bath for controlling the temperature of the tube to the stretching temperature while a cooling bath is disposed in the region of the draw-off part. A Raman spectrometer operating with laser waves is disposed in the zone downstream of the cooling bath. The frequency of the laser waves is adapted to the plastic used and the energy of the laser waves is so adapted to the wall thickness of the tube produced that in addition to the radiated wave scattered or reflected by the plastics, at least one wave corresponding to a Raman spectral line is radiated from the tube.

Abstract: An evaluation method of a flow analysis on molding of a molten material is achieved in a system of performing a flow analysis on an in-mold molten material through breakdown of a molded part model into minute elements and numerical analysis thereof including the calculi of finite elements, boundary elements, finite differences, FAN and the like. One or more temperature conditions of the molten material are provided with a plurality of loading times respectively for conducting an analysis and from the obtained operational results of the temperature distribution of the molten material after loading, an average temperature or a medium layer temperature of each element is calculated as a function Tn=fn(t) having a variable of the loading time. This function is graphically indicated on a display apparatus to determine the ranges of the molten material temperature and the loading time at a predetermined mold temperature.

Abstract: An evaluation method analyzes flow on molding of a molten material. This is achieved in a system of making a flow analysis on an in-mold molten material through division of a molded part model into minute elements and numerical analysis thereof including the calculi of finite elements, boundary elements, finite differences, FAN and the like. One or more temperature conditions of the molten material are provided with a plurality of loading times or mold temperatures respectively for performing an analysis and from the obtained operational results of the pressure distribution of the molten material a function of the maximum molten material pressure of each element is provided. This function is graphically indicated on a display apparatus to evaluate the appropriate ranges of the molten material pressure and the loading time at a predetermined molten material temperature.

Abstract: An apparatus for operating an injection machine wherein the molding condition during the building up interval is automatically changed in accordance with such parameters as the metal mold temperature, resin temperature and the temperature of a portion of the heating cylinder to which resin is supplied from a hopper. The apparatus is constructed to facilitate the building up of the molding condition, thus decreasing the number of useless shots.

Abstract: A multi-layer parison has a plurality of layers of main and auxiliary resins laminated with each other. An apparatus for forming the multi-layer parison includes a main resin extruding mechanism, at least one auxiliary resin extruding mechanism and a control unit for controlling the main and auxiliary resin extruding mechanisms so that the pressure for extruding the auxiliary resin is immediately increased and the pressure for extruding the main resin is gradually increased at the beginning of extrusion of the main and auxiliary resins.

Abstract: In an extrusion device of the type which has a screw rotating in a housing and which has a feed section in which a feed roller, cooperating with the screw, is provided, a stripper blade is used to remove the fed material from the feed roller. The present invention provides a method and an apparatus for maintaining the net force acting on the stripper blade to direct it towards the feed roller constant. To achieve this, the force of the fed material which acts in a direction tending to move the feed roller and the extrusion screw apart is measured. An opposing force is applied to the stripper blade in dependence upon the magnitude of the measured force. By so doing, the net force directing the stripper blade towards the feed roller is maintained constant.

Abstract: A molding condition recording apparatus having a manual data input device with a CRT. The manual data input device has various keys for inputting parameters of various groups used for controlling injection, hold, metering and cylinder temperature, and for inputting molding defect indication data. A microprocessor for a programmable machine controller causes the input parameters and the molding defect indication data to be stored in a molding condition storage region of a shared memory (S5). The microprocessor then discriminates similarity between the thus stored molding condition and the molding condition already registered in a molding condition/molding defect storage file of a memory other than the shared memory (S7). If there is similarity between these molding conditions, the microprocessor causes the CRT to display an alarm message thereon together with the parameter already registered in the file and the mold defect indication data (S12).

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 method of controlling an injection molding machine wherein a purging operation for changing a raw material resin, a warming up operation for warming up the machine until a condition at which a mass producing operation can be started are preset, and metal mold temperatures corresponding to successive operations and metal mold temperatures corresponding to successive purging and warming up operations are preset so as to successively perform the purging and warming up operations and then begin the mass producing operation, characterized in that at the time of restarting the injection molding machine, after removal a trouble which caused a temporal pause of the operation of the machine, a pause time and the metal mold temperature are detected from the warming up operation corresponding to the set mold temperature, the restarting being commenced in accordance with the set metal mold temperatures which vary depending upon a length of the pause time.

Abstract: The quality that is good or bad of an injection molded product is judged. The temperature T of a metal mold, of a resin in the mold cavity, barrel or nozzle of an injection molding machine is measured at a time t elapsed after comencement of a pressure holding step of the injection molding machine. The present P of resin in the mold cavity or barrel or nozzle is measured at the time t, and a time function A=f(t) is calculated using the temperature T and the pressure P, where A represents a calculating parameter T/P, P/T, T.times.P, T+P or T.+-.P. This is compared with a reference time function Ao=f(t) of a shot in which satisfactory products can be obtained, with a time function An=f(t) of another shot.

Abstract: Described herein is an interlock system for an isostatic press machine of the type including a high pressure container having upper and lower closure plugs releasably received in upper and lower openings to be used for loading and unloading work therethrough, and a holder frame for supporting the axial force of the container in an isostatic pressing phase of the press operation, the holder frame being pivotally supported at one side thereof for swinging movements about a vertical axis into and out of a holding position in engagement with the high pressure container, wherein the interlock system is provided with a lock mechanism constantly urged to lock the holder frame in the holding position, and a control means adapted to control the lock mechanism to maintain the lock on the holder frame when the internal pressure of the high pressure container is higher than a predetermined level and to release the lock when lower than the predetermined level.

Abstract: In an input display apparatus including a display member adapted to display a plurality of set items, and a transparent panel including key elements and superposed on the display member, there are provided a profile controlled graphic display picture wherein such operating conditions as a speed, pressure and number of revolutions of a screw during one operation step of an injection molding machine are displayed in multi-stages in accordance with an operating position of the screw, and level changing means for changing the levels of the profile display picture in accordance with the magnitude of a changed value when an operating condition of the injection molding machine is changed. According to a modification, the display surface of the display member is divided into upper and lower sections. The upper section is provided with the function of an increment key and the lower section is provided with the function of a decrement key.

Abstract: A drive system abnormality detecting apparatus of an injection-molding machine includes a microprocessor (19) for a controller, which causes a display unit (24) to indicate the occurrence of an abnormal situation. The drive of a servomotor (5) for an injection is stopped when the microprocessor concludes that the difference between the driving current of the servomotor and the output of a force detector, indicative of the resin pressure inside a cylinder (2), is not within predetermined permissible limits. The motor driving current and the detector output are individually periodically detected, during the time interval between the start of injection to the end of metering. By doing th is, the microprocessor prevents production of defective moldings, attributable to the occurrence of an abnormal situation in a screw drive system, and damage to components of the screw drive system and dies.

Abstract: Device for measuring the temperature of the material contained in a closed apparatus. Including a probe equipped with a sensitive thermocouple element mounted in a protective housing made of an electrically and thermally insulating material in contact with the material to be measured, the element is connected with a preamplification electronic circuit adjacent to it, and having an operational preamplifier connected with a couple of semiconductor switches and an integration circuit which probe is connected to means located at a distance from the apparatus for amplifying and processing the signal and associated with visualization, recording and control members.

Abstract: An injection molding machine having a resin pressure detector in the form of a strain gauge bonded on an annular member (55) which is fixed to a rear end face of a metering bearing housing (41) by bolts (57), and which has a rear end face to which a ball nut (56) is fixed by bolts (59). Upon assemblage, no substantial deformation of the annular member occurs, and hence no zero point shift in the strain gauge is found, so that an accurate detection is achieved by the strain gauge. The maintenance and replacement of the annular member, disposed outside the housing, can be easily performed.

Abstract: This invention relates to an injection pressure control apparatus for a die cast machine and an injection mold machine. In the injection pressure control apparatus, it detects whether the pressure increase state of the instance when the pressure of the injection cylinder is increased through a pressure increasing circuit is normal or not. When detecting the above state, the pressure change obtained at the instance when the pressure increasing circuit is operated is detected between two points, of which it is determined whether the time spent therebetween is within an allowable time or not and the result is indicated. Moreover, the pressure detected after the pressure increasing circuit was operated and a predetermined period of time has passed is determined whether it is within a predetermined allowable range or not and the result thereof is indicated.

Abstract: A motor control device for an electric injection molding machine. The injection molding machine has a screw rotating mechanism including a rotary shaft associated with one end of a resin feeding screw received in a heating cylinder, a holding member rotatably holding said rotary shaft and slidable in the axial direction of said rotary shaft, and a first motor for driving said screw through said rotary shaft. The injection molding machine also includes a second motor for producing a force for advancing said screw in the injecting direction and retracting said screw, a screw shaft and a nut for converting the output torque of said second motor into linear movement, and a sliding member to which said nut is fixed. The motor control device includes a load detecting member fixed at one end to said holding member and at the other end to said sliding member, and a controller for controlling the operation of the first and second motors in accordance with the level of load detected by the load detecting member.

Abstract: A control apparatus for an injection molding machine injects a melted resin within a housing into a cavity of a mold through a nozzle section of a nozzle at a housing and by movement of a screw. A nozzle opening changing mechanism variably changes a throttled path area of the nozzle while a mold temperature sensing mechanism sensing the temperature of the mold. A control mechanism controls the nozzle opening changing mechanism in accordance with the sensed temperature of the mold temperature sensing mechanism.

Abstract: An injection molding machine having a system for detecting nozzle leaks including a thermocouple positioned in the tunnel opening of a stationary platen of the machine at a predetermined location relative to the nozzle to sense instantaneous temperature at the location. A controller coupled to the thermocouple receives signals from the thermocouple and activates an alarm when the temperature in the tunnel opening falls outside of a predetermined normal operating temperature range.

Abstract: Control apparatus for an injection molding machine having a sensor provided for the injection molding machine for producing a signal representing the quality of the molded product or a molding condition of the injection molding machine, a set value memory device in which a permissible range of the signal is set, a judging member for judging as to whether the signal lies in the permissible range, a production lot data memory device containing control data for the injection molding machine with respect to a lot now being produced, and a destination table showing a destination of the data corresponding to a result of judgment of the judging member, a controller for controlling the injection molding machine in accordance with the control data stored in the production lot memory device, and another memory device for storing a plurality of sets of the production lot data regarding various lots or production conditions, and a storing device for determining a destination of the production lot data based on the result

Abstract: A method for the supervision of injection molding including monitoring an internal die pressure of molten resin flowing through a resin passageway in a mold to form a monitored waveform; displaying the monitored wavefrom together with a predetermined reference waveform on a display unit such as a CRT, and comparing the monitored waveform with an allowable value of the reference waveform to determine any abnormality caused in a molding process. The injection molding can be supervised with accuracy on the basis of the reference waveform representing the optimum internal die pressure, thereby increasing the quality of molded articles.

Abstract: In preparing a film by extruding a molten thermoplastic resin, a heater in which a temperature profile varying in the width direction can be set is arranged in the width direction in the vicinity of a die lip, and a temperature sensor for detecting a resin temperature profile in the vicinity of the outlet of the die lip and a sensor capable of detecting a thickness profile of a film or the like in the width direction are disposed. The output of the heater is controlled according to signals from the temperature sensor and thickness sensor to automatically adjust the thickness of the film or the like in the width direction, whereby a homogeneous film with a reduced thickness unevenness can be stably prepared with a high precession of control of the thickness unevenness. .

Abstract: An injection molding machine includes a numerical control system in communication with a host computer, the numerical control system having incorporated therein a computer, wherein the injection molding machine can itself start and stop in operation on the basis of stored data indicating that the injection molding machine is in a state capable of being operated or in a state incapable of being operated. Pre-processing is executed in response to a start-up signal from the host computer (steps S4 through S9). If a malfunction or abnormality happens during the pre-processing, the location and thus the existence of the abnormality is stored in memory of the numerical control system. After completion of the pre-processing, if the stored abnormalities are judged to be restorable on the basis of the storage contents in the memory, an abnormality restoration processing is executed (S17) and, subsequently, automatic operation is carried out (S11).

Abstract: Control and monitoring instrumentation for a high speed double rotary tablet press mechanism is disclosed. Each tablet press side has strain gauges producing signals indicative of table compression. The strain gauges generate control signals received by a peak detector, which holds the maximum strain signal. The peak signals are converted to digital form and provided to a microprocessor that first controls operation of the reject gate and regulates tablet consistency by controlling powder fill into the dies, and second, passes information to RAM. The RAM is shared by a master CPU, clocked 180.degree. out of phase with the microprocessor. The master CPU produces either a CRT or printed output of both raw and statistically abstracted tablet press data.

Abstract: An improvement for casting machines is provided which assures a constant thickness and density of extruded material by varying the speed of nip forming rolls.

Abstract: An error detector for various set values is provided which is incorporated in an injection-molding machine of a type controlled by a numerical control unit (1).In order to prevent wrong operations of the injection-molding machine due to setting errors of set values, in the error detector, discrimination means (3) determines whether set values of various items of forming conditions, inputted through input means (14), fulfill requirements related to the items. If the inputted set values fulfill the requirements, they are stored in memory means (6). If not, an alarm is delivered.