Abstract: A convection furnace is provided for brazing workpieces in a heated recirculating atmosphere, in which the workpieces are positioned within a heating chamber of the furnace and are alternately heated from different sides in a controlled manner such that a substantially uniform temperature is maintained throughout the workpieces while their temperatures are increased by the heated atmosphere, preferably an inert gas. The braze furnace is adapted to intermittently divert the heated atmosphere to one side of the heating chamber, through one or more stacked workpieces, to an opposite side of the heating chamber. As such, a pulsed multi-directional convective atmosphere flow is achieved through the workpieces that promotes a more rapid and uniform heat transfer to the workpieces. As a result, each structure as a unit reaches a suitable braze temperature more effectively and efficiently than previously possible.

Abstract: A positioning apparatus and method for synchronously controlling a plurality of motors, such as servo motors, and exercises synchronous control by means of only motors without using any mechanisms, such as coupling shafts, clutches, gears and cams. A controller has a virtual drive capability which provides a virtual cam and virtual clutch capability on the basis of stored values, permitting continuous and repeated operation of a single cycle of positioning with respect to changes in input axis position address data without recalculation of command addresses in real time.

Abstract: An apparatus for synchronously controlling the actual operation of a machine using one or more motors, such as servo motors, by simulating in program form a combination of selectable machine mechanisms, including drivers, connecting shafts, clutches, gears and cams. Each such machine mechanism is represented by a virtual mechanism, preferably as a software module that contains information uniquely identifying the module, operation information that defines the generation of position information and connection information that defines other modules to which connection is made. The software modules comprise drive modules for generating position information, transmission modules for simulating the transmission mechanisms and output modules for outputting motor commands.

Abstract: An apparatus for synchronously controlling the actual operation of a machine using one or more motors, such as servo motors, by simulating in program form a combination of selectable machine mechanisms, including drivers, connecting shafts, clutches, gears and cams. Each such machine mechanism is represented by a virtual mechanism, preferably as a software module that contains information uniquely identifying the module, operation information that defines the generation of position information and connection information that defines other modules to which connection is made. The software modules comprise drive modules for generating position information, transmission modules for simulating the transmission mechanisms and output modules for outputting motor commands.

Abstract: A control system having multiple control apparatuses connected by a data transmission path. Each of the control apparatuses comprises a communication control section, sequence control section, and positioning control section. The positioning control section of each control apparatus has a memory. A position controlling program is stored in the memory of a first one of the control apparatuses. The position controlling program has codes, each of which to be used by a positioning control sections of a particular control apparatus, for controlling its respective servo motor. The codes of the position controlling program are transmitted from the first control apparatus to another control apparatuses to cause the positioning control section of that apparatus to control its respective servo motor in accordance with the codes.

Abstract: An apparatus for synchronously controlling the actual operation of a machine using one or more motors, such as servo motors, by simulating in program form a combination of selectable machine mechanisms, including drivers, connecting shafts, clutches, gears and cams. Each such machine mechanism is represented by a virtual mechanism, preferably as a software module that contains information uniquely identifying the module, operation information that defines the generation of position information and connection information that defines other modules to which connection is made. The software modules comprise drive modules for generating position information, transmission modules for simulating the transmission mechanisms and output modules for outputting motor commands.

Abstract: In a process for brazing a metal in a continuous manner, a work consisting of a base metal and a part to be brazed thereto is disposed in a box-like heat retaining container which is opened at its upper portion to surround lower and side surfaces of the work and fixing the work by a retaining jig. The work within said heat retaining container is heated by a continuous combustion in a gas burner, so that the temperature of said work is risen to a predetermined preheating temperature. Then, the work is subjected to a soaking treatment at the preheating temperature by switching-over the combustion in the gas burner to a pulse combustion. The continuous combustion in the gas burner is restarted to rise the temperature of the work to a brazing temperature, and then, the part is brazed to said base metal with the temperature of the work maintained at the brazing temperature by switching-over the combustion in the gas burner to a pulse combustion.

Abstract: In a process for brazing a metal in a continuous manner, a work consisting of a base metal and a part to be brazed thereto is disposed in a box-shaped heat retaining container which is opened at its upper portion to surround lower and side surfaces of the work and fixing the work by a retaining jig. The work within said heat retaining container is heated by a continuous combustion in a gas burner, so that the temperature of said work is raised to a predetermined preheating temperature. Then, the work is subjected to a soaking treatment at the preheating temperature by switching-over the combustion in the gas burner to a pulse combustion. The continuous combustion in the gas burner is restarted to raise the temperature of the work to a brazing temperature, and then, the part is brazed to said base metal with the temperature of the work maintained at the brazing temperature by switching-over the combustion in the gas burner to a pulse combustion.

Abstract: Disclosed herein is a moisture sealing apparatus for a powdery brazing flux, comprising an open-topped container for the powdery brazing flux, a nozzle positioned at the center over the container and adapted to cause dry air to flow out through a slit opened out in all horizontal directions, and an air pipe for supplying the dry air, which is connected to the nozzle. According to the apparatus, a powdery flux having strong deliquescence is always kept a completely dry state.

Abstract: In a metal-brazing pulse burner, a gas/air mixing pipe being comprised of a pipe member having a diameter larger than those of a combustion air supply pipe and a mixed gas supply pipe, and an air injection nozzle connected to the combustion air supply pipe to project therefrom along a central line of the pipe member, the nozzle having an injection opening at its tip end which opening is located nearby an opening of the combustion gas supply pipe opened at a sidewall of the pipe member, thereby a gas in the combustion gas supply pipe is drawn and supplied by air flow injected from the air injection nozzle. With this arrangement, a pilot flame is not blown off and quenched, and a stable pulse combustion can always be conducted.

Abstract: An apparatus for synchronously controlling the actual operation of a machine using one or more motors, such as servo motors, by simulating in program form a combination of selectable machine mechanisms, including drivers, connecting shafts, clutches, gears and cams. Each such machine mechanism is represented by a virtual mechanism, preferably as a software module that contains information uniquely identifying the module, operation information that defines the generation of position information and connection information that defines other modules to which connection is made. The software modules comprise drive modules for generating position information, transmission modules for simulating the transmission mechanisms and output modules for outputting motor commands.

Abstract: A load state decision apparatus of a servomotor where a load current value of a servomotor during operation is sampled and compared with a prescribed value and then the load state is decided based on the result, a motor current value is detected by adding the function to the existing apparatus and the detected motor current value is sampled at prescribed time intervals and stored in a memory, and an effective current value is calculated from the current value data and the calculated effective current value is compared with the rated current value and the load state of the servomotor is decided, thereby a converting or detecting apparatus need not be installed externally but the load state can be decided automatically.

Abstract: A heatable sheet assembly comprises a sheet to be electrically heated, electrically conductive metal foils applied to both surfaces of the sheet and an electrical terminal attached to each of the metal foils.

Abstract: An electrically heatable sheet contains 3 to 20% by weight of carbon fibers and 97 to 80% by weight of natural pulp. The carbon fibers consist of at least two groups of different lengths, each of the carbon fibers of one group having a length of not shorter than 3 mm and shorter than 5 mm, each of the carbon fibers of the other group having a length of not shorter than 5 mm and not longer than 10 mm. The carbon fibers is selected from the group consisting of pitch type carbon fibers, polyacrylonitrile type carbon fibers and mixtures thereof. The sheet has a thickness of not thicker than 150 .mu.m and a basis weight of not larger than 55 g/m.sup.2.

Abstract: A highly shrinkable acrylic filament yarn which exhibits a degree of shrinking of at least 20% in boiling water, a maximum heat shrinking stress of at least 0.15 g/d in a dry heating atmosphere, and a Young's modulus of at least 280 Kg/mm.sup.2 after free shrinking treatment in boiling water.

Abstract: A control circuit can drive an electric motor such as a stepping motor and a DC torque motor within a wide supply voltage range so that its rotor follows a selected speed pattern without error. The control circuit includes a monitoring circuit for monitoring a level of the supply voltage to output a detection signal. The control circuit also includes a memory storing a plurality of speed patterns, the plurality of speed patterns corresponding respectively to different levels of the supply voltage. One of the plurality of speed patterns is selectively read in response to the detection signal. The electric motor is then driven in accordance with the read speed pattern.

Abstract: An ink jet recording head in which the ink in an ink cavity is jetted in the form of a droplet from an ink nozzle by utilizing a piezo-electric effect. The recording head includes a piezo-electric plate made of piezo-electric material and having a plurality of elongated ink cavities formed therein, and a cover plate fixedly placed on the piezo-electric plate. The cover plate has a plurality of ink supplying inlets in the region of the nozzles.

Abstract: An ink jet recording head in which the ink in an ink cavity is jetted in the form of a droplet from an ink nozzle by utilizing a piezo-electric effect. The recording head includes a piezo-electric plate made of piezo-electric material and having a plurality of elongated ink cavities formed therein, and a cover plate fixedly placed on the piezo-electric plate. In one of the embodiments, each of the plurality of elongated ink cavities has two deep grooves formed in the longitudinal direction of the ink cavities and a shallow groove provided between the two deep grooves. Voltage applying electrodes are provided on piezo-electric portions which form the shallow grooves.

Abstract: A method of controlling the positioning of a rotor of a stepping motor is disclosed. During the last step in a movement of the rotor to a desired rest position thereof, the windings of the stepping motor are energized so as to produce a first magnetic vector, a position indicated by the first magnetic vector being displaced from the desired rest position in the direction of the movement of the rotor by a predetermined amount. This displacement of the first magnetic vector causes the rotor to overshoot the desired rest position by such an amount that a positioning error of the rotor due to a hysteresis characteristic of the rotor in the direction of the movement thereof is compensated. The windings are then energized to produce a second magnetic vector with the position indicated by this second magnetic vector coinciding with the desired rest position of the rotor. The energization of the windings may be performed in small steps to effect a vernier driving of the rotor.

Abstract: A device for connecting the turbine blades of a turbine having a plate-shaped member provided at the radially outer end of each turbine blade and extended substantially at a right angle to the longitudinal plane of the turbine blade. The plate-shaped member is projected from the leading and trailing edges of the turbine blade, and is provided with through bores formed in each projected portion. Connecting members having cylindrical pins or the like projections are disposed between two adjacent turbine blades in such a manner that the projections are rotatably received by respective through bores. Namely, one of the connecting members is connected to the plate-shaped member of the leading edge of the turbine blade while the other connecting member is connected to the plate-shaped member of the trailing edge of the preceding adjacent turbine blade.