Abstract: Provided is magnetic ferrite powder in which a peak intensity ratio of Z phase (M3Me2Fe24O41: M=one or more kinds of alkaline-earth metal, Me=one or more kinds from Co, Ni, Mn, Zn, Mg and Cu) of hexagonal ferrite is 30% or higher in X-ray diffraction and a peak value of a grain size distribution is in a range from 0.1 &mgr;m to 3 &mgr;m.

Abstract: A ferromagnetic powder composition for dust cores contains a ferromagnetic metal powder and 0.1-15% by volume based on the powder of titania sol and/or zirconia sol. The composition is pressure molded and desirably annealed into a dust core which exhibits a high magnetic flux density, low coercivity, low loss and high mechanical strength.

Abstract: An ultrasonic injection nozzle includes an ultrasonic vibration generating device and a vibrating element. The vibrating element; connected to the vibration generating device so as to be vibrated thereby. The vibrating element has formed at its forward end an edged portion to and along which a liquid material is delivered to be atomized.

Abstract: The present invention is directed to the combination of a vibrating element and an ultrasonic nozzle having an ultrasonic vibrator. The combination includes a body having a liquid supply passage therethrough and a chamber having a first and second end. The liquid supply passage is in communication with the chamber via its first end. The second end of the chamber defines an opening. An inner peripheral wall forms a portion of the chamber intermediate the first and second end. A multistepped edged portion is formed on the inner peripheral wall and each step defines an edge which severs and atomizes the liquid which cascades thereover from the liquid passage.

Abstract: This invention consists of a vibration element for use on an ultrasonic injection nozzle, the vibrating element being formed around its outer periphery with a multi-stepped edged portion having one or more projecting steps each defining an edge, the edges having the same diameter and the edged portion being adapted to be supplied with liquid.

Abstract: The present invention consists of a vibrating element for ultrasonic atomization formed around its inner or outer periphery with a multi-stepped edged portion having at least two steps, each edged portion defining an edge, the edged portions being supplied with liquid for atomization, wherein the multi-stepped edged portion includes successively connected continuous curved surfaces where the steps are partially formed with a curved surface.

Abstract: An ultrasonic injection nozzle includes an ultrasonic generator, an elongated vibrating element, a liquid feeder and a solenoid valve. The vibrating element has a first and second end. The generator is connected to the first end. A multi-stepped edge portion is connected to the second end. Each step of the edged portion defines an edge. The liquid feeder is located adjacent the second end. The solenoid valve is in communication with the liquid feeder.

Abstract: An ultrasonic injection nozzle includes an ultrasonic vibration generating device and a vibrating element. The vibrating element is connected to the vibration generating device so as to be vibrated thereby. The vibrating element has formed at its forward end an edged portion to and along which a liquid material is delivered to be atomized.

Abstract: A polishing machine has an upper polishing plate and a lower polishing plate provided below the upper polishing plate. The upper polishing plate has slurry passages. Plugs for supplying slurry are detachably quick coupled to the slurry passages. A piece of polishing pad is bonded to the lower surface of the upper polishing plate. After a spent polishing pad has been removed and a fresh polishing pad has been attached to the lower surface of the upper polishing plate, a hole-cutter is downwardly inserted in each slurry passage until it pierces the fresh polishing pad, thus cutting a hole in the polishing pad.

Abstract: A polishing machine for polishing the surfaces of the workpieces to be processed has upper and lower surface plates which are rotated relative to each other. A plurality of carriers are placed between the upper and lower surface plates and each of the carriers has a plurality of bores into which the workpieces are fitted. These carriers are engaged with both the sun gear and the internal ring gear within the same plane. In account of the sun gear and the internal ring gear, the carriers are rotated round the sun gear, turning round their own axes. The internal ring gear can be lifted up and down by a lift mechanism. The sun gear is slidably attached to a hollow driving shaft and has a feed screw which is engaged with a feed nut. This feed nut is rotatably fitted onto the hollow driving shaft in such a way that the nut is limited of its movement in the axial direction.

Abstract: In a fret saw blade having a shank portion and saw-teeth, the saw-teeth are formed in a manner that the centers of the cutting edges of some saw-teeth are depressed and deformed generally in V-shape so as to form sharp ends projecting beyond the side surfaces of the shank portion of the fret saw blade.