Abstract: In apparatus for vapor phase growing N or P type semiconductor layers on semiconductor substrates supported by a rotary support disposed in a reaction furnace, and various types of gases are admitted into the furnace through a pipe line network and valves, there is provided a control device for ON-OFF controlling the valves according to a predetermined program. The control device comprises a memory region for storing a process program group including a group of process programs including informations regarding a time for designating a process of vapor phase growth in the reaction furnace, gases utilized, flow quantity thereof and furnace temperature, and a system program that decodes the program group for producing control signals for the valves.

Abstract: An injection molding machine comprises an injection piston-cylinder mechanism including therein an injection piston and a booster piston. The booster piston is provided with a longitudinal through hole through which a pressurized fluid is supplied from an external source into the piston-cylinder mechansim so as to act on the injection piston to fill the mold cavity with molten bath. When the inner pressure of the cylinder chamber between both pistons reaches a predetermined value or the injection piston reaches a predetermined position, a valve assembly which is connected to the cylinder chamber through a conduit is operated so as to drain the pressurized fluid in the cylinder chamber in a controlled manner thereby to advance the booster piston.

Abstract: In a torque control system of an induction motor having m phase stator windings and P poles there are provided a torque instructor and a phase n voltage V.sub.ns generator responsive to a torque instruction given by the torque instructor to calculate the phase n voltage according to the following equation. ##EQU1## where ##EQU2## m: number of phases, n: 1, 2, . . . , m,P: number of poles,I.sub.o : constant exciting current (ampere),r.sub.s, r.sub.r, l.sub.r and l.sub.m : constants inherent to the induction motor,.theta.: rotor rotational angle (radian) of the induction motor, andI.sub.2 : instructed rotor current (ampere) proportional to an instructed torque.

Abstract: In a speed control system of a synchronous motor, a pulse modulated signal containing a signal representing rotational angle of the motor is formed to control the speed. The pulse modulated signal is passed through a synchronous rectifier to obtain currents supplied to stator windings of the motor.

Abstract: Multiple mold clamping apparatus comprising a plurality of mold clamping stations, each having a fixed die plate with a fixed die, a rest plate which is separated from the fixed die plate by a certain distance a movable die plate with a die opposingly facing the fixed die, and a moving device for moving the movable die plate, a hydraulic cylinder unit is slidably mounted beneath the rest plate and includes a piston rod defining an end surface portion for contacting the movable die plate, a power transmitting device mounted on the movable die plate for transmitting clamping force from the piston rod to the movable die, and a conveying device for conveying the hydraulic cylinder unit from one mold clamping station to another.

Abstract: In apparatus for measuring injection speed of an injection molding machine having a piston rod reciprocated by an injection cylinder of the injection molding machine, a plunger rod having, at an end thereof, a plunger tip slidably received in a plunger sleeve connected to a die, and a plunger coupling for interconnecting the plunger rod and the piston rod, the plunger coupling is provided with a projection. A proximity switch detects the projection while the plunger coupling moves. In accordance with the output of the proximity switch, the speed of the plunger coupling is computed.

Abstract: In a metal mold for molding a hollow product having inwardly tapered side wall with a stationary die plate for forming a bottom portion of the product, a core, and a cavity plate surrounding the core, the core has a truncated pyramid shape and first and second slide cores are provided between the core and the cavity plate. The core and slide cores are constructed such that at the time of opening the mold both slide cores are moved inwardly in an interlocked relation with retractive movement of the core thus leaving one end of the molded product for enabling removal thereof.

Abstract: An automatic tool exchanging apparatus of a machine tool comprises a machine body, a tool storage magazine, a spindle attached to the machine body, a tool conveying mechanism and a tool exchanging mechanism which are located between the tool storage magazine and the spindle for exchanging a tool in the magazine with a tool in the spindle, and a drive unit for driving the tool exchanging and tool conveying mechanisms. The tool conveying mechanism comprises a guide bar horizontally arranged between a predetermined position of the tool storage magazine and an intermediate tool pot of the tool exchanging mechanism, a tool carriage movably supported by the guide bar, a tool carriage reciprocating mechanism, a tool conveying arm member rotatably supported by the tool carriage and provided with clamp arms to clamp a tool, a tool conveying arm member rotating mechanism, and a tool conveying arm member reciprocating mechanism.

Abstract: Apparatus for measuring injection speeds of a die casting machine comprises a detecting device for detecting injection times at low and high speed injection strokes, calculating elements for calculating low and high injection speeds by dividing the low and high injection strokes by the injection times, and displaying elements for displaying the low and high injection speeds as average injection speeds. The injection time detecting device includes an elongated member having different magnetic characteristics, an element responsive to the characteristics to generate pulse signal, low and high speed injection limit switches, and a discriminating element for discriminating the period of the signal generated by the pulse signal generating element. The injection speeds of the die casting machine can be measured and displayed by the interrelative operations of the elements and devices described above.

Abstract: In a printing machine of the type wherein the quantity of ink is adjusted by varying a gap between an inking roller and an adjusting piece there are provided an actual position representing unit which stores a data corresponding to a gap width, a reference position setting unit for the adjusting piece at which the ink does not leak out, a comparator comparing outputs of the actual position representing unit and the reference position setting unit, an inking roller rotating state judging unit which produces a stop signal when the inking roller stops, and a gate circuit responsive to the stop signal and the output of the comparator for moving the adjusting piece. The control circuit is constructed to maintain the adjusting piece at the reference position when the inking roller is stopped.

Abstract: In apparatus for controlling a plasticizing process of a resin of an in-line screw-type injection molding machine, a position of the screw is continuously detected in accordance with the movement thereof and a control function is determined on the basis of one of various factors, such as resin heating energy, shearing energy, injection pressure and filling speed, which determine a temperature distribution of a resin to be injected. The operating condition, particularly the number of revolutions and the back pressure of the screw, is controlled on the basis of the control function and the screw position so as to uniformalize the temperature distribution of the resin.

Abstract: A spindle of a machine tool driven by an induction motor is controlled by a torque control system including a pulse generator coupled to the spindle, a reversible counter which counts the number of pulses, a first register connected to receive an output signal of the counter via sampling gate. The data in the first register is transferred to a second register and difference between data in the first and second registers is calculated by a calculator in the form of a register. An input device delivers a speed instruction signal and an angular position instruction signal which is added to an output signal of the first register to form a position instruction signal. A computation unit is provided to calculate respective phase currents of the induction motor in response to the speed instruction signal or the position error signal for continuously controlling motor torque or position the spindle at an instructed angular position.

Abstract: A machining unit for use in a machine tool comprises a slide base support mounted on a base of the machine tool, a slide base located above the slide base support, and a device slidably mounted on the slide base for working a workpiece. Link members are pivotably attached to the slide base support and the slide base to constitute a quadric link mechanism. The quadric link mechanism is operated by a hydraulic cylinder-piston assembly swingably secured to the slide base support. The machining unit may further comprise a member attached to the slide base support for positioning and supporting the slide base so as to maintain a predetermined inclination thereof with respect to the horizontal.

Abstract: When cutting a groove of a predetermined contour through a plate shaped workpiece with a fret saw blade, various program data regarding the direction of movements of the fret saw blade and the contour of the groove to be cut are stored in a memory device. The fret saw blade is moved in a direction instructed by the memory device and the orientation of the saw blade is controlled at the starting point of each segment of the groove.

Abstract: In a device for picking up tubular workpieces sequentially from a stack, and supplying the same to a subsequent stage, at least one truck is provided so as to be reciprocable between a loading position and an unloading position. In the loading position, the tubular workpieces are stacked up on the truck in an orderly manner into a number of layers, each layer including a plurality of rows each including a number of axially aligned tubular workpieces. A workpiece carrying bar reciprocable between an advanced position passing through the inner bores of a row of the tubular workpieces and a retracting position freeing the row, device for shifting the workpiece carrying bar horizontally and vertically, and devices for controlling the operation of the aforementioned devices are further provided.

Abstract: A die casting machine comprises a pair of relating movable die plates, a pair of mold halves attached to the opposing surfaces of the die plates, and a spray device for spraying mold releasing agent to inner surfaces of the mold halves. The spray device comprises a cylinder-piston assembly secured to a support member mounted on one of the die plates, a link mechanism being operated by the movement of the cylinder-piston assembly, and a spray head supported at the front end of the link mechanism and provided with a plurality of spray guns. The spray guns are positioned in a space between the mold halves when the link mechanism is moved to a predetermined inclined position by the operation of the cylinder-piston assembly.

Abstract: In a machine for cutting grooves of a given pattern through a blank with a fret saw blade, openings for receiving the fret saw blade at the cutting starting points of the grooves are determined such that the center of each opening is positioned at a point spaced from a cutting start point by a distance equal to one half of the width of the fret saw blade in a direction opposite to the direction of cutting the groove.

Abstract: A machine tool control system includes a numerical control device associated with each machine tool and an interface unit interposed between each machine tool and the numerical control device. The numerical control device includes a first memory area for storing a first group of programs related to the machining of a workpiece and the selection of a cutting tool, and a second memory area for storing a second group of programs related to interrupting instructions.

Abstract: For the purpose of controlling the torque of a three phase induction motor a control system suitable to be operated by a computer is provided. A torque instruction, an angle of rotation, a flux angle, the magnitude of rotating magnetic field and suitable constants are used to produce current instructions for respective phases to pass stator current necessary to produce an instructed torque.

Abstract: A control valve operating as a combined relief and make-up valve for use in hydraulic apparatus comprises a valve housing provided with a blind hole, a valve seat tightly engaged with the inlet of the blind hole, a cylindrical hollow make-up poppet slidably inserted into the blind hole, a cylindrical relief poppet slidably inserted within the make-up poppet, a screw member adjustably engaged with the inner surface of the end of the make-up poppet, a coil spring disposed between the screw member and the relief poppet, and a balance piston having one end tightly inserted into the inner cylindrical hole of the relief poppet. The valve housing is provided with a first opening connected to an external hydraulic supply device and a second opening connected to a hydraulic source. The first and second openings are communicated with each other in response to differential pressure of an operating fluid so as to operate the control valve as a relief valve or a make-up valve.