Abstract: Accurate control of the tension of a wire electrode in a wirecut electrical discharge machine is achieved by eliminating a direct-current (DC) component from a speed difference signal between a braking section and a recovery section of the machine. The DC component of the speed signal which is eliminated is associated with the stretching of the wire electrode while under tension. As a result, the tension can be maintained constant dynamically as well as statically, thereby improving machining accuracy.

Abstract: A system for controlling running of a vehicle comprises a switch for setting a slow-run mode, a sensor for detecting that the brake is being applied, a driving force control device mechanically separated from the accelerator for controlling a driving force of the vehicle, a sensor for detecting the running speed of the vehicle, a switch for setting a slow-run speed command signal. A target speed is generated on the basis of information concerning the brake activation and, the running speed of the vehicle and the slow-run speed command signal value. In the slow-run mode, when the brake is not applied, the driving force control device is driven to cause the vehicle to run at the target slow-run speed, and when the brake is applied, the driving force control device is driven so that no driving force is produced at least in the direction of travel of the vehicle.

Abstract: An inter-vihicle distance detecting device for automatic tracking of a foregoing car which comprises: image sensors for taking images of a foregoing car; displaying means for displaying one of the images of the foregoing car being taken by the image sensors; an image taking window which repeats forward and backward movement horizontally from an end to the other end of a display of the displaying means at a predetermined speed; an image tracking starting switch being operable by a driver; image tracking means for tracking the image of the foregoing car, activated by the image tracking starting switch when the image of the foregoing car enters in the image taking window; and detecting means for detecting an inter-vehicle distance between a car of the driver and the foregoing car being displayed on the image taking window.

Abstract: An idle position detection switch, in which a fixed contact, a terminal for transmitting an idle position signal to an external terminal, and a support disc firmly attaching both the fixed contact and the terminal are insert-molded into a connector made of a resin. As a result of the construction, not only the switch can be fabricated with less components and less cost, but also each contact portion has such an improved rigidity as to allow the incidence of false contacts to be reduced.

Abstract: A pressure sensor comprising a hollow main body (11) defining a bore (14) extending therethrough and having a detection end and an output end. A pressure sensing assembly is disposed within said bore (14) to divide it into a detection cavity (17) and an output cavity (18) through which output signal lines from said pressure sensing assembly extend. A flexible diaphragm (19) is attached to the detection end of the bore to define a sealed detection cavity (17) in which a pressure transmitting liquid is filled. The pressure sensing assembly comprises support plate (24) welded to said main body (11) and supporting a pressure sensing element (26) within said detection cavity (17) through a mounting bed (4). The signal lines sealingly extend through said support plate (24) from said detection cavity (17) to said output cavity (18).

Abstract: An ignition timing control device for an internal combustion engine includes an ignition signal coil for producing a first pulse signal in synchronism with the revolution of the engine and in correspondence to a predetermined crank angle position, a crank angle sensor for producing a second pulse signal in synchronism with the revolution of the crank, the second pulse signal having a greater frequency than said first pulse signal, and a microcomputer for performing an ignition control of the engine by detecting the crank angle on the basis of the first and second pulse signals. The microcomputer is adapted to perform an ignition control by another means when an abnormal state of the crank angle sensor is detected from the second pulse signal.

Abstract: A gradation record printer in which an amount of energy applied to a thermal head is controlled in response to a gradation level of an input image signal to print an image on a printing medium with gradations. The printer comprises a gradation density detecting unit for storing data of standard density patterns with respect to address values corresponding to gradation levels and for outputting a coincidence signal when data supplied from an outside of the gradation density detecting unit substantially coincides with the data of standard density patterns. A gradation test print circuit is used to apply data of different amounts of printing energy to the thermal head sequentially to make a gradation test print on the printing medium. A density detecting sensor detects densities of the gradation test print and applies a detection output from the density detecting sensor to the gradation density detecting unit.

Abstract: A control device of a vehicle-mounted, self-excited alternator for supplying a field current to its field coil and selectively a charge current to a battery and a power to a high voltage electric load of the vehicle comprises a field current detector for detecting field current flowing through the field coil and a field current limiter which includes a reference device for providing a fixed reference value, a comparator for comparing the field current detected by the field current detector with the fixed reference value and a voltage regulator control device responsive to an output of the comparator to control the voltage regulator to cut-off the field current when the field current detected is larger than the reference value.

Abstract: The invention relates to a monitor system for a servo controller used in connection with servo motors utilized in multivarious machines, such as machine tools. In addition to detecting a servo system fault when the difference between the commanded position and the actual position exceeds a predetermined value, the system monitors several servo system parameters to distinguish between different causes of servo faults. Identifying the source of the fault leads to improved maintenance and decreased system down time when a fault occurs.

Abstract: A coaxial starter comprises an electric motor housed in a cylindrical yoke, a clutch mechanism for transmitting rotational force of the electric motor to an output shaft disposed on the same axis as an armature shaft of the electric motor, and a front bracket for supporting the output shaft. The yoke of the electric motor is formed of a metal sheet integrally with the front bracket through drawing.

Abstract: In the pedal assembly of a sewing machine drive device, a potentiometer operating member is guided by a mounting stand secured to the pedal stand, to control the slide shaft of a direct acting type potentiometer, and a speed changing pedal including a depressing board to depress the potentiometer operating member with its one end portion is coupled to the pedal stand with the other end portion. When the speed changing pedal is stepped on, a signal is outputted to change the speed of rotation of the sewing machine according the movement of the pedal thus stepped on. The pedal stand may have an opening with which the pedal is swingably engaged. In addition, signal pedals may be arranged in alignment with the speed changing pedal with the same mounting means provided at the position of those pedals, so as to allow the pedals to swap in position with one another.

Abstract: A driver device for a duty solenoid valve comprises a pair of transistors 27 and 31 for controlling the excitation current level flowing through the solenoid 17 of the valve, and a transistor 45 for turning on and off the excitation current. The excitation current level is detected via an integrator 63 and A/D converter 61 by a microcomputer 62. In response to the detected excitation current level, the microcomputer 62 generates a first pulse signal (PWM signal) via OUT3 to control the level of the excitation current to a target level. Further, the microcomputer 62 outputs a second pulse signal via the OUT4 to the transistor 45 to control the duty ratio of the solenoid 17.

Abstract: An electric discharge contour machining method in which a plurality of rod-shaped portions having different outer diameters on one rod-shaped electrode are used to machine the contour shape of a workpiece. The workpiece is selectively machined in any of a plurality of contours by the single electrode having an optimum electrode diameter for each selected contour. Specifically, the method uses one rod-shaped electrode having a plurality of rod-shaped portions, each portion having a different outer diameter such that the workpiece contour having a small inner corner of first radius R is machined by the electrode portion having a small outer diameter and the workpiece contour having a large inner corner of second radius R is machined by the electrode portion having a large outer diameter.

Abstract: In a starter unit, the internal gear frame of an epicycle reduction gear is set rotatable with respect to the front bracket, and a first over-running clutch is made up of a clutch outer fixed to the front bracket, and a clutch inner which is the front end portion of the internal gear frame, and a second over-running clutch which is a conventional over-running clutch is mounted on the output shaft. The provision of the two over-running clutches eliminates the difficulty that, when the start switch is turned on during the inertial rotation of the engine or starter unit, the pinion is reengaged with the ring gear, so that abnormal shock is applied to the side of the starter unit to damage the rotation transmitting members.

Abstract: An electric discharge machining control apparatus in which the know how of a skilled person can be readily written which concerns the setting of machining conditions such as pause time, discharge duration time, servo reference voltage, and speed gain which are necessary for maintaining optimum electric discharge machining conditions and for offering a maximum electric discharge machining efficiency, as well as the criterions to the instability of electric discharge machining conditions. According to the know how, the machining control is carried out in a most suitable manner, and can be automatically adjusted when required.

Abstract: An air fuel ratio control system for an internal combustion engine, comprising: an internal combustion engine having a plurality of cylinders, and exhaust passages corresponding to the respective cylinders; a plurality of oxygen sensors arranged in the respective exhaust passages to detect the composition of exhaust gas from the respective cylinders; and a control unit for independently controlling an air fuel ratio of the respective cylinders based on outputs from the oxygen sensors.

Abstract: The invention relates to a spindle drive controller for a machine tool such as a numerically controlled lathe of the two spindle type. According to the invention, a drive control unit is enabled to separately control the spindles, or jointly control both spindles simultaneously. A switchover unit controls whether one or both spindles is controlled, and changeover units are provided for selectively feeding back speed and position feedback signals from one or the other of the respective spindles, depending on which spindle is being driven at that time.

Abstract: A planetary speed reduction gear type starter comprising a planetary speed reduction gear unit and a DC motor is designed as follows: In the case where the motor is smaller in outside diameter than the planetary speed reduction gear unit, the inside diameter of the yoke is accordingly reduced; that is, the front end portion of the yoke is increased in inside diameter into a large diameter portion. The planetary speed reduction gear unit is fitted in the large diameter portion, with the front end of which a front bracket is engaged. Thus, only one kind of front bracket can be used for a plurality of planetary speed reduction gear type starters different in reduction gear ratio.

Abstract: A Hall-effect sensor, wherein a Hall element is disposed in a magnetic path being formed by a magnet and a flux guide, and the magnet, flux guide, and Hall element are integrally held with a molded frame, and the Hall element is fixed to the magnet (or flux guide) or the molded frame. This Hall-effect sensor can easily position the Hall element with higher sensitivity.

Abstract: Disclosed herein is a malfunction detection apparatus for use in an outboard engine or motor system having a tachometer. The apparatus includes a tachometer output circuit for applying the tachometer signal to the tachometer in accordance with the input signal attributing to the battery voltage or engine speed, the battery abnormality detecting circuit for detecting the abnormal condition of the battery voltage, to provide the detection signal and the switch circuit for suspending, in response to the detection signal, the application of the tachometer signal from the tachometer output circuit to the tachometer. The apparatus is advantageous in that the erroneous operation of the tachometer can be positively prevented.