Abstract: In order to eject resin leaked from an injection chamber (13) toward the shaft side of an injection plunger (31) away from an injection cylinder (30), a plunger-type injection molding machine injection device is equipped with an ejection guide (151, 251) at the rear edge of an injection cylinder which is thermally isolated from the injection cylinder main body. A band heater (53), which heats the ejection guide, is controlled independently of the band heater (38) which heats the injection cylinder. One embodiment of this injection guide (151) causes the ejected resin to fall from the ejection opening (151h) while retaining its molten state. In another embodiment, the ejection guide (251) has ejection channels (251f) which cause the resin to harden and be ejected in a fine strand state.

Abstract: A dynamic molten mass guide sleeve disposed to articulate to compensate for differences in expansion between an inner hot flow hot channel injection and mold cavity with air gap insulation therebetween. Prior fixed molten mass guide sleeves required extremely stringent location deviations and often led to mold cavity ruptures or leakage as a result of differential expansion between the nozzle body having the hot flow channel and the mold cavity channel. The inventive sleeve is fitted with peripheral sealing lips at each end and is mounted between the body having the hot flow channel and the mold cavity (6). The sleeve compensates for differential heat expansion while enabling well-defined temperature separation in the mold feed orifice area of the injection mold by sealing the air gap (4).

Abstract: A work tank (20) for an electric discharge machine includes a tank wall (21) having an opening in a front surface and surrounding a workpiece; a front door (31) horizontally movable between an unlock position, where the front door is vertically movable, and a lock position, where the opening is closed in a generally liquid-tight relationship; a pair of brackets (32) attached to both sides of the front door and extending rearwardly; a handle lever (51) capable of pivoting about a fulcrum (35) and supported on at least one of the brackets; and a cam follower, fixed to the handle lever further forward than the pivot, the cam follower being vertically movable between a first position (H1) higher than the fulcrum and a second position (H2) lower than the fulcrum. The cam follower is fitted loosely into a groove (62) extending vertically and formed in a rail block (61). Horizontal movement of the cam follower is restricted.

Abstract: A wire cutting device (3) for cutting a wire electrode (5), used to generate an electric discharge between it and a workpiece (W), comprising a drive gear (12), a follower gear (13) which meshes with the drive gear and is shiftable in its axial direction relative to the drive gear, an adjustable bias mechanism (17) which presses the follower gear against the drive gear in order to accommodate wire electrode of various diameters, materials and conditions, take-up rollers (10a, 10b) which feed spent wire electrode between the drive gear and the follower gear, and a drive mechanism for driving the drive gear such that the peripheral speed of the drive gear is greater than the speed at which the wire electrode is fed out by the wire take up device.

Abstract: A locking device (10) for an indexable spindle (1) to which a tool electrode is attached, comprises a brake disk (2) fixed to the spindle, an annular upper brake member (11) movable in the axial direction of the spindle between a first position and a second position closer to the brake disk than the first position, a annular lower brake member (13) movable in the axial direction of the spindle between a third position and a fourth position closer to the brake disk than the third position, an upper disk (21) arranged facing upper surface of the brake disk across a minimum gap when the upper brake member is at the first position, a lower disk (22) arranged facing lower surface of the brake disk across a minimum gap when the lower brake member is at the third position, and drive means for moving the upper and lower brake members in the axial direction of the spindle.

Abstract: The main spindle (1A) for the main spindle device of a diesinker electric discharge machine is connected to a high rotor inertia, high output servo motor (15) without passing through a speed reducer; the servo motor (15) is equipped with a high resolution encoder (14). A main spindle rotation speed detection signal is detected by the encoder (14) when the main spindle (1A) is rotating in the high speed mode, and a main spindle angle position and rotation speed detection signal are detected when the main spindle (1A) is being angle divided, and these signals are fed back to the servo motor (15) motor driver (16). High speed rotational control and angle position precision angle division control are accomplished by a single servo motor and a single encoder.

Abstract: A device applying device for applying tension to a traveling wire electrode including a controllable torque brake (11), a rotatable tension roller (2) around which a wire electrode (6) is wound, and a drive roller (4) directly linked to the brake means and pressed against the peripheral surface of the tension roller, and having a diameter smaller than the diameter of the tension roller. An alternative tension applying device includes a brake (11), a rotatable tension roller (2), an intermediate roller (12) having substantially the same diameter as the tension roller and formed integrally with the tension roller, and a drive roller (4) directly linked to the brake and pressed against the peripheral surface of the intermediate roller, and having a diameter smaller than the diameter of the tension roller.

Abstract: A wire cut electrical discharge processing device comprising a device (6) which takes up a wire electrode, the wire electrode (1) traveling along a wire conveying path; a servo motor (4B) which applies tension to the traveling wire electrode; a NC device which generates signals which indicate a set value for the tension; a force detector (9) which detects the tension applied to the wire electrode and generates signals which indicate the detected value; and a tension control device (13) which processes signals which indicate the set value of the tension and the signals which indicate the detected value of the tension and which supplies speed command signals which direct the speed of rotation of the servo motor. The tension control device comprises two continuously connected notch filters (19 and 20) which check different frequencies.

Abstract: A switch is disclosed for use in a power supply circuit for supplying electric discharge power between a tool electrode and a workpiece.

Abstract: A machine tool tool changing device including a circular array of multiple collet fingers (5) housed in the shaft hole (12) of a spindle (1) capable of turning between a clamped position in which a tool holder (2) knob (22) is clamped and an unclamped position in which the knob is released, a collet sleeve (6) which surrounds the circular array of collet fingers and arrests the turning of same, an air cylinder which moves the collet sleeve axially relative to the collet fingers and releases the arresting of the collet fingers, a first plate spring (43) which exerts a strong force on the knob toward the spindle through the collet fingers, an air cylinder which removes the force exerted by the first plate spring, and a second plate spring (46) which exerts a force to maintain the collet fingers in the clamped position in opposition to the weight of the tool holder even if the collet fingers rotate and the force exerted by the first plate spring is removed.

Abstract: When a process measurement metering operation is performed during a molding cycle, a plunger is forcibly caused to retract to a position behind measurement metering completed position, while at the same time a periodic forced purge operation is implemented in which the plunger is immediately restored to the vicinity of the position at which the forced retraction operation commenced. By this operation, leaked resin is removed to the rear, i.e., beyond the plunger metering stroke range, and any increase in resistance to movement of the plunger due to disposition of leaked resin is avoided. The forced purge operation is preferably performed either immediately prior to the normal metering operation, or after a specified time has elapsed following completion of a metering operation.

Abstract: A power supply device for an electric discharge machine for supplying power to a work gap (6) formed between a work piece and a tool electrode, includes a parallel circuit in which a first power supply (8), a second power supply (36) and a capacitor (34) are connected in parallel and the second power supply can supply a larger voltage and a smaller current than the first power supply to the work gap. A switching element is connected between the parallel circuit and the work gap for pulsing power from the parallel circuit.

Abstract: A wire cut electric discharge machine which has a first wire guide movable relative to a workpiece in a first axial direction, and a second wire guide movable relative to a workpiece in a second axial direction which is parallel to the first axial direction, for machining the workpiece by generating an electrical discharge between a wire electrode traveling between the first and second wire guide, and the workpiece, where the sum of the degree of movement in the first axial direction and the degree of movement in the second axial direction is limited in order to prevent component parts of the device from striking one another.

Abstract: A wire cut electric discharge machining apparatus for machining a workpiece using a wire electrode traveling vertically between upper and lower wire guide devices includes a work tank in which the lower wire guide device and the workpiece are disposed, a lower wire guide drive unit disposed outside the work tank for driving the lower wire guide device horizontally in a direction of a first axis, a connecting shaft for connecting the lower wire guide device and the lower wire guide drive unit, a guide rail extending from the outside to the inside of the work tank in the direction of the first axis and being movable relative to the work tank in the direction of a second axis perpendicular to the first axis, and a support provided on the first guide rail for movably supporting the lower wire guide device.

Abstract: A flushing device having therein a chamber into which dielectric fluid is supplied for injecting dielectric fluid into a machining gap formed between a workpiece being machined and a wire electrode in a wire-cut electric discharge machine, a nozzle movable between a first position and a second position that is nearer the workpiece than the first position, for directing the dielectric fluid in the chamber toward the machining gap; and a spring or other bias apparatus for holding the nozzle in the first position.

Abstract: A power supply device for electric discharge machining apparatus, for supplying power to a gap formed between a workpiece and a tool electrode comprises a d.c. power source, a bridge circuit supplied with d.c. voltage from the d.c. power source and having switching transistors provided on each side, and a control circuit for controlling the on/off switching operation of switching transistors of the bridge circuit so that a.c. voltage pulses are applied from the bridge circuit to the gap. A first resistor limits current flowing when the workpiece is negatively poled and the tool electrode is positively poled. A second resistor having a larger value than the first resistor limits current flowing when the workpiece is positively poled and the tool electrode is negatively poled.

Abstract: A power supply device for an electric discharge machining apparatus, comprising a d.c. power source (2), a bridge circuit (80) having one pair of opposed switching circuits and the other pair of opposed switching circuits, and a controller (90) for alternately turning on either the one pair of switching circuits or the other pair of switching circuits so that high frequency a.c. voltage pulses are applied from a d.c. power source across a gap (G) formed between a workpiece (61) and a tool electrode (62). The four switching circuits (81, 82, 83, 84) respectively include at least two switching transistors connected in parallel, and the controller alternately turns on the least two transistors for each of the four switching circuits.

Abstract: A multiple capillary analyzer allows detection of light from multiple capillaries with a reduced number of interfaces through which light must pass in detecting light emitted from a sample being analyzed, using a modified sheath flow cuvette. A linear or rectangular array of capillaries is introduced into a rectangular flow chamber. Sheath fluid draws individual sample streams through the cuvette. The capillaries are closely and evenly spaced and held by a transparent retainer in a fixed position in relation to an optical detection system. Collimated sample excitation radiation is applied simultaneously across the ends of the capillaries in the retainer. Light emitted from the excited sample is detected by the optical detection system. The retainer is provided by a transparent chamber having inward slanting end walls. The capillaries are wedged into the chamber.

Abstract: Disclosed is a rotation control circuit for positioning a rotating member driven by a motor comprising a power supply and a motor relay which is energized by the power supply. A circuit is provided for intermittently energizing the relay. The circuit may comprise a first switch means connected to the power supply and a second switch means connecting the first switch means to the motor relay. The second switch means is normally closed and a timer is connected to the first switch means which is operable in response to a closing of the first switch means to generate a relay energizing signal after a predetermined time delay. This signal is operable, through an associated relay, to open the second switch means and thereby deenergize the motor relay after the predetermined time delay. The control circuit is also operable to energize the motor relay in the continuous mode. Finally, safety interlocks are provided in the control circuit to minimize any hazards to operating personnel.

Abstract: Methods and apparatus for thermally altering the near surface characteristics of a material are described. In particular, a repetitively pulsed ion beam system comprising a high energy pulsed power source and an ion beam generator are described which are capable of producing single species high voltage ion beams (0.25-2.5 MeV) at 1-1000 kW average power and over extended operating cycles (108). Irradiating materials with such high energy, repetitively pulsed ion beams can yield surface treatments including localized high temperature anneals to melting, both followed by rapid thermal quenching to ambient temperatures to achieve both novel and heretofore commercially unachievable physical characteristics in a near surface layer of material.