Abstract: An image printer for creating a hard copy of a television image or an image produced by computer graphic having a high image quality. The image printer is provided with an apparatus for driving a thermal printing head having a processor which does not permit heat to be produced continuously across the boundaries between adjacent picture elements and for controlling the blocks of the thermal printing head to print a subline divided from one scanning line and to repeat the subline printing to complete the printing of the one scanning line.

Abstract: A brushless alternator for a vehicle comprising a field coil holding device formed by mounting a field coil winding spool directly on a field core using a bonding agent thus eliminating the need for a metallic cylindrical spool holder which requires precise machining in order to engage with the field core for welding. With this arrangement, a simple and inexpensive field coil holding device eliminates former precise machining. In addition, a field coil can be wound around the field coil winding spool in advance, before bonding to the field core.

Abstract: An acceleration sensor is disclosed which includes a weight, piezoelectric element(s), a charge amplifier, an insulation plate and a conductive casing. The insulation plate fixedly mounts the weight and piezoelectric element(s) and is fixed to the conductive casing which is maintained at the earth potential. Input terminals of the charge amplifier are connected to the output electrodes of the element(s) and a grounding circuit of the amplifier is connected to the conductive casing so that the input terminals of the amplifier are floated from the earth potential.

Abstract: A motor driven power steering apparatus comprising an electric motor for assisting steering, a torque sensor for detecting steering torque, a detecting means for detecting vehicle speed or rotation speed of an engine, a resistance for limiting electric current to be supplied to an electric motor, and a relay being connected in parallel to the resistance, opens the relay when the vehicle is running at a high speed, that is, the vehicle speed or rotation speed is larger than a predetermined value thereof, limits current to be supplied to the electric motor by the resistance, makes torque generated by the electric motor smaller in the case where anything unusual is created in the apparatus at a high speed running, and makes it easier for a driver to correct the steering operation or to avoid a danger.

Abstract: A current control device for an automotive electromagnetic clutch includes a first and a second transistor 8 and 13 and a current detector resistor 14, which are coupled in series with the electromagnetic clutch 4. A PWM modulator 7 controls the ON/OFF of the first transistor to control the amount of excitation current flowing through the electromagnetic clutch. The second transistor turns off the excitation current in response to the disconnection signal SO for the electromagnetic clutch. The current detector 6 detects the current flowing through the resistor 14, and the amount of current through the electromagnetic clutch is controlled to a target valve via the calculation means 2, the deviation amplifier 5, and the PWM modulator 7. The error in current detection due to the current flowing through the reverse excitation resistor 12 is eliminated by the insertion of a transistor 17 controlled in response to the clutch disconnection signal SO by a transistor 19 (FIG. 2).

Abstract: A vehicle's AC generator is provided with a rotor magnetic pole core assembly fixedly mounted on a rotary shaft and excited through an exciting coil, stator-coil-mounted stator cores surrounding the magnetic pole core assembly, first and second brackets supporting the stator cores and rotatably supporting the rotary shaft through bearings, a pair of fans provided on both ends of the rotor magnetic pole core assembly, to allow cooling air to flow in the space defined by the first and second brackets, a rectifier, and a voltage regulator. In addition, a cooling solution circulating structure, made of a material high in thermal conductivity, is provided on the side of one of the first and second brackets. The cooling solution circulating structure, which has an upper frame and a lower frame, has a flow path inside to which a cooling solution is supplied from outside.

Abstract: An industrial robot system comprises a control unit including programs for operating an industrial robot and a peripheral device of the industrial robot according to the programs; a memory for storing the steps of the programs which are effected when the industrial robot and peripheral device are stopped unintentionally; a detector for detecting the conditions of the industrial robot and peripheral device when the industrial robot and peripheral device are stopped unintentionally; and a restarter for starting the industrial robot and peripheral device again when the contents of the memory coincide with the conditions detected by the detectors.

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: A laser cutting machine in which a laser beam is condensed by a machining lens, and while the laser beam thus condensed is being applied to a workpiece, the laser beam and the workpiece are moved relative to each other, to cut the workpiece, the laser cutting machine comprising optical axis moving means for moving the laser beam applied to the machining lens in parallel with an optical axis to a desired position on the machining lens, and optical axis movement control means for controlling the optical axis moving means in conformance with a program provided for a cutting locus to control the relative movement of the condensed laser beam and workpiece, so that the laser cutting machine which is not expensive, and can form a cut in a workpiece in such a manner that the cut is not tapered in section, without lowering the machining accuracy is obtained.

Abstract: In a numerical control data forming system for a numerical control unit which is operated with a display unit and a data inputting unit, and has an automatic programming function to form machining data for a machine tool, the automatic programming function includes the operation that, in defining a machining configuration, the coordinates of a temporary last point are inputted, and the coordinates of an actual last point are automatically calculated, whereby numerical control data can be readily formed.

Abstract: A numerical control device used in conjunction with a machine tool including a spindle head having a plurality of tapping tools is provided with a tapping pitch data group memory which stores the tapping pitch of each tool. Upon selection of a tool according to a machining program, a corresponding data group is retrieved from memory and from this data group an average tapping pitch is obtained. According to the average value thus obtained, a suitable feed rate is selected.

Abstract: A method and apparatus for electric discharge machining whereby the total machining time to machine a workpiece through coarse, medium and finish surface roughness stages is significantly reduced. Machining condition data for the three surface roughness stages is stored in a memory. As the machining progresses, the surface roughness of the workpiece is monitored. If the surface roughness is found to exceed the reference level for the corresponding stage, machining using the present conditions is continued, whereas, if the surface roughness is below the reference level, the machining conditions are switched to those of the next stage.

Abstract: A compound machining apparatus according to the present invention comprises an electrode mechanical machining device for machining an electrode material fixedly secured in such a manner that the electrode material is immersed in a machining solution with a cutting tool connected to a spindle into an electrode having a predetermined configuration; parts exchanging device for exchanging, after the formation of the electrode, the cutting tool connected to the spindle for a workpiece to be machined; and workpiece machining device for machining, after the cutting tool has been exchanged for the workpiece, the workpiece with the electrode in the machining solution by electric discharge.

Abstract: A semiconductor laser excited solid laser device of side light excited type in which the excitation region is well matched with the mode volume of the laser oscillation mode, for providing high output and high efficiency. The semiconductor laser excited solid laser device comprises a diffraction grating for diffracting the output light beams of the semiconductor lasers in a direction of formation of the laser resonator mode in application of the output light beams to the solid laser medium.

Abstract: A motor-operated pump of the in-tank type including a motor for driving the pump, the motor having a commutator; a bracket covering one end of the motor disposed adjacent to the commutator; a brush held against the commutator through a through hole formed in the bracket; and a bearing for supporting a shaft of the motor. An annular projection is formed on a central portion of a surface of bracket disposed in opposed relation to the commutator, and the annular projection is formed integrally with the bracket. Alternatively, an annular projection is formed on a central portion of the commutator disposed in opposed relation to the bearing, and the annular projection is made of an electrically insulating material constituting the commutator, and is formed integrally with the commutator.

Abstract: An evaporated fuel gas purging system comprises a chamber having a case and a cap, the chamber being divided into a plurality of sub-chambers by partitioning plates each having through holes; a pair of electrodes provided in one of the sub-chambers, the one of sub-chambers being filled with an adsorbent and communicating with the other sub-chambers having an inlet port, an outlet port and a purge port, respectively; and a control circuit for detecting changes in electrical characteristics between the electrodes so that the amount of a fuel gas adsorbed by the adsorbent is detected. An evaporated fuel gas purging system further comprises a purging unit for purging the adsorbed gas, a control unit for controlling the purging unit, and a display unit operating in response to quantitative changes in the amount of the adsorbed gas.

Abstract: The short-circuit and ground fault detecting apparatus for automotive electromagnetic clutches consists of a clutch current calculating device, a clutch current control device, and a clutchoutput cir;cuit operation detecting device. The clutch current control device has two output transistors on the positive and negative side of the clutch, serving as switches connected to current supply mechanisms of the magnetic clutch. The magnetic clutch is energized and deenergized by turning on and off the output transistors. The voltages at the output transistors are sent to the clutch output circuit operation detecting device, where they are removed of ripples and converted into digital signals and then fed back to the clutch current calculating device, which in turn checks the digitized voltages for any fault.

Abstract: A vehicle AC generator control device includes an AC generator including a field coil; a rectifier for rectifying an AC output of the AC generator; a battery connected to an output terminal of the rectifier; a voltage regulator including a switching element series-connected to the field coil, the voltage regulator detecting a terminal voltage of the rectifier or battery to operate the switching element to control a field current of the field coil to adjust an output voltage of the generator to a predetermined value; a dummy load unit including a dummy load balanced with an output capacity of the AC generator; and an overvoltage limiter which detects when the output voltage of the AC generator exceeds a set value, to energize the dummy load unit, so that the dummy load unit is connected to an output terminal of the rectifier, to thereby suppress any abnormal rise of the output voltage.

Abstract: A distributor for igniting a combustion engine which comprises: a movable gear additionally provided rotatably on a first gear; and a resilient member provided between the movable gear and the first gear. The resilient member displaces in an amount larger than a backlash caused between the tooth of the first gear and the tooth of a second gear. As a result, the second gear is clamped between the tooth of the movable gear and the tooth of the first gear by a resilient force of the displaced resilient member, thereby causing no backlash between the teeth of these gears.

Abstract: An accelerometer for automobiles is disclosed which is mounted on an electrically insulating plate (i.e., a printed circuit board) accommodated within an electrically conductive casing. The electrical connections from the electrodes of the piezoelectric element to the inputs of the charge amplifier are effected by a wiring pattern formed on the insulating plate. The casing consists of an open box-shaped base and a plate-shaped cover, a packing member being interposed therebetween, wherein an electrical connection between the base and the cover is provided by the fixing screws for fixing the cover to the base. The cover has a central recess in which through-type capacitors for producing hermetically sealed electrical connections through a wall of the casing are accommodated.