JPS5583067A - Constant spacing holding method - Google Patents

Abstract

PURPOSE:To maintain spacing size accurately constant by placing the longitudinally acting body disposed in opposing contact with the width line of the outside circumferential surface of a cylindrical rotary operating body across a pair of arm members which makes slide contact through elastic pressure with the side end faces, etc. of the operating body. CONSTITUTION:The dielectric drum 5 as a rotary operating body comprises coupling a cylinder 6A to a drum shaft 8 by way of two sheets of discs 7 and being provided with the annular groove 6a in which balls 9 fit on the inside wall surfaces closer to the right and left side ends of the cylinder 6A. On the other hand, a pin electrode 10 as an acting body is of the original plate shape of nearly an equal width as the cylinder 6A and the bottom end edge of the semicirular shape in section is put in opposing contact with the width line of the outside circumferential surface of the cylinder 6A. A pair of arm members 11 are secured to the right and left sides of the bottom end part thereof and balls 9 are held in place in the semi-spherical recesses pierced in the folded part thereof. In addition the pin electrodes 10 are suspended to immobile part 12 by two stretching springs 13 and are being held pulled up and energized. This constitution enables the same to be maintained with high accuracy.