Abstract: The disclosed method involves teaching a robot by moving a robot member and sampling its position at predetermined times. Only position data changed more than a predetermined difference from the last stored position data are recorded as instruction data and the instruction data are played back as position data at predetermined times independent of the time required to move the robot member in the teaching steps.

Abstract: A zirconia compound comprised of zirconia powder and an organic binder which flows smoothly in a molten state is injection molded in a sprue-runnerless fashion, removed of the binder, and fired, obtaining a high density zirconia sintered body.

Abstract: A sheet-forming slurry composition is composed of zirconia powder, an organic binder, and a solvent. The zirconia powder contains 2 to 10 mol % of yttria in solid solution form and has a BET specific surface area of up to about 12 m.sup.2 /g and a mean particle size multiplied by the specific surface area of up to 3 .mu.m.m.sup.2 /g. The composition is formed into a green sheet having improved flexibility, binder removal capability, sinterability, and dimensional stability, which is then fired into a sintered part having improved denseness, gas barrier property, and surface smoothness.

Abstract: A zirconia ceramic composed of crystals which scarcely undergo phase transformation from tetragonal system to monoclinic in the temperature range of from 100.degree. C. to 300.degree. C. even in the presence of water vapor or water is disclosed, said zirconia ceramic comprising at least 93% by weight of partially stabilized zirconia mainly composed of tetragonal crystals and containing mainly Y.sub.2 O.sub.3 and ZrO.sub.2 at the former to the latter molar ratio of from 2/98 to 4.5/95.5 and balance of at least one of the oxides selected from the group consisting of boron oxide, germanium oxide, and gallium oxide, wherein the content of the boron oxide is 1% by weight or less.

Abstract: Zirconia sintered bodies are produced by injection molding a zirconia composition comprising zirconia powder and an organic binder and firing the molded composition. High density sintered bodies having strength, white transparency and smoothness are obtained when zirconia powder containing 2 to 10 mol % of yttria in solid solution form and having a specific surface area of up to 12 m.sup.2 /g as measured by the BET method and a product of average particle size by specific surface area of up to 3 .mu.m.multidot.m.sup.2 /g is used.

Abstract: A control system of an industrial robot includes an operation program read out from a storage medium and deciphered and calculated to obtain data so that a robot machine is controlled on the basis of the data. An external memory has function of a conventional internal memory and it is limited to store one program in, for example, an IC card constituting the storage medium and the IC card is inserted into the external memory to supply the operation program. A plurality of operation programs are previously stored in, for example, a floppy disk device constituting a recording medium of the external memory and a desired program is selected by a keyboard to directly supply it to the controller of the robot to operate the robot.

Abstract: A direct teaching type robot in which in the playback of the robot an electric power corresponding to a playback command is supplied to an electric motor from a servo driver so that the electric motor is driven to move a moving arm of the robot and in the teaching operation the moving arm is directly moved by an instructor to teach its movement to the robot includes breaking means provided in the servo driver for breaking a current generated by the electric motor when the electric motor is rotated in response to the teaching operation of the moving arm so as not to flow into the servo driver, whereby operation force by the instructor for moving the moving arm of the robot in the teaching can be reduced.

Abstract: A direct teaching type robot has a moving arm driven by an electric motor. The moving arm is directly moved to previously store data corresponding to the movement of the moving arm ina robot controller and when operated as the robot, the moving arm is operated on the basis of the stored data. Power lines for the electric motor are cut off in a teaching mode in which movement position of the moving are are taught in the robot.

Abstract: A method of correcting and playing back positional instruction data in a robot which performs the teaching by moving an arm or wrist axis constituting a robot body and recording its locus at intervals of a predetermined time or a predetermined moving distance corrects positional data recorded after the completion of the teaching onto a predetermined pattern such as a straight line or a circular arc and plays back the corrected positional data. Further, the method corrects the positional data onto the predetermined pattern before the beginning of the playback previously and records the corrected data.

Abstract: A control system of an industrial robot includes an operation program read out from a storage medium and stored and calculated to obtain data so that a robot machine is controlled on the basis of the data. An external memory has function of a conventional internal memory and it is limited to store one program in, for example, an IC card constituting the storage medium and the IC card is inserted into the external memory to supply the operation program. A plurality of operation programs are previously stored in, for example, a floppy disk device constituting a recording medium of the external memory and a desired program is selected by a keyboard to directly supply it to the controller of the robot to operate the robot.

Abstract: A method of examining operation of an electronic control system for an internal combustion engine having a crankshaft, the control system having a mechanism for generating pulse signals indicative of angular position of the crankshaft and a processing circuit for evaluating the indicative pulse signals so as to output pulse signals for controlling an engine operation-related factor. The mechanism generates each indicative pulse signal at a time when the crankshaft is at one of predetermined angular positions. The processing circuit outputs each control pulse signal when the crankshaft is at a desired angular position. According to the method, the indicative pulse signals are continuously counted so as to generate a succession of counted numbers, each counted number representing the number of the indicative pulse signals generated during a time from an occurrence of one the control pulse signal to an occurrence of next the control pulse signal.

Abstract: A method of detecting the reference crank angle position in an internal combustion engine at the time of starting the engine, the engine having a crankshaft and a plurality of cylinders and associated with an ignition timing control device having a pulse signal generating mechanism including a rotor and a pair of first and second pulsers angularly spaced around the rotor for detecting passage of reactors disposed on the rotor. According to the method, the internal combustion engine is cranked, and the electric pulse signal generated by the first pulser is counted by a counter by referring to the content of a latch circuit. The counter is reset and enabled to count the electric pulse signal again when the reference crank angle position is not detected until the count of the counter reaches a predetermined count. The predetermined count being equal to a maximum number of electric pulses that can be generated by the first pulser while the rotor makes one revolution.

Abstract: A transducer converts the amount of mechanical displacement of a member into an electrical signal by magnetic induction. Two fixed coils different in winding direction from each other are spaced apart from each other by a suitable distance and connected in series. Inside the fixed coils, a movable coil is disposed which moves in cooperative association with the member whose amount of movement is to be detected. With the movable coil supplied with an a.c. current, the fixed coils produce an induction current whose amplitude varies with the relative position of the movable coil. A signal processing circuit generates a pulse having a duty ratio corresponding to the amplitude of the induction current. This pulse is converted into a d.c. current in a smoothing circuit to obtain a d.c. voltage corresponding to the amount of mechanical displacement.

Abstract: A game machine has indicia which indicate the proper time to control visible moving symbols. The indicia comprise lights or sounds to make a player recognize the proper time when predetermined prize-winning symbol or combination of symbols will occur on one or a plurality of rotatable reels in a stopped position of the reels as controlled by the player.

Abstract: Two cylindrical stator magnetic poles are disposed with a suitable space therebetween, and a plunger is movably disposed within the two stator magnetic poles. A coil is wound around the outer periphery of the two stator magnetic poles, and a current flowing in the coil causes the plunger to advance forward. The current flow is interrupted before the plunger reaches the intermediate position between the two stator magnetic poles, and the plunger thereafter further advances by inertia and strikes a ball. After the ball is struck, the coil is again supplied with a current, and the plunger is in turn supplied with a magnetic force in a retreat direction.