Abstract: A grinder includes a rotatable disk to be pressed to a workpiece; a plurality of grinding bodies provided on one principal surface of the disk so as to cross a circumferential direction of the disk, each having a grinding stone chip on a side contacting the workpiece; and support devices, each supporting each of the grinding bodies so that the grinding stone chip swings with respect to the principal surface. Each support device supports each grinding body at a position at which an abrasion amount of the grinding stone chip is made uniform when the disk is rotated while being pressed to the workpiece so that a pressure to be applied to the grinding stone chip on an outer peripheral side of the disk becomes smaller than a pressure to be applied to the grinding stone chip on an inner peripheral side of the disk.

Abstract: A grinder includes a rotatable disk to be pressed to a workpiece; a plurality of grinding bodies provided on one principal surface of the disk so as to cross a circumferential direction of the disk, each having a grinding stone chip on a side contacting the workpiece; and support devices, each supporting each of the grinding bodies so that the grinding stone chip swings with respect to the principal surface. Each support device supports each grinding body at a position at which an abrasion amount of the grinding stone chip is made uniform when the disk is rotated while being pressed to the workpiece so that a pressure to be applied to the grinding stone chip on an outer peripheral side of the disk becomes smaller than a pressure to be applied to the grinding stone chip on an inner peripheral side of the disk.

Abstract: A wire saw 10 is laid across sheaves 12, 14, 16, and 18 arranged within a substantially horizontal plane. The sheave 12 is rotated by a rotary motor 30 to horizontally drive the wire saw 10. Within a region formed by the wire saw laid across the sheaves, a stone material 80 is set on a carriage 82. The carriage 82 is provided with front wheels 83 and rear wheels 84, and the wheels are set on the pair of rails 85 laid so as to extend in a direction substantially orthogonal to a cutting portion 10A of the wire saw. When the carriage 82 is moved in the direction of the arrow F2 and the stone material 80 is brought into contact with the cutting portion from the inner side of the region formed by the wire saw, the wire saw smoothly bends within the same plane.

Abstract: An apparatus for cutting a stone member (90) so as to have a curved surface including a cutting device (10) having a base member (12) which is movable in horizontal direction by an electric motor (23) and an endless wire saw (17) disposed on the base member and driven by an electric motor (19) so as to make the vertical movement of the cutting portion thereof, a table (27) which has a narrow space for passing the wire saw by the movement of the base member and many rollers (30) each of which is rotatably supported on the prescribed position of the table for supporting the stone member and is rotatable around an axis elongated in the moving direction of the base member, a frame (32) which is movable by an electric motor for moving the stone member supported on the rollers, and a control device (40) which controls the electric motor for moving the base member and the electric motor for moving the frame. The control device may be an optical follow device.

Abstract: An apparatus for cutting a stone member so as to have a curved surface, the apparatus including an endless wire saw disposed horizontally and driven by an electric motor. The saw has a plurality cutting parts including diamond powder cutting parts and is able to be moved vertically by an electric motor. A carriage for supporting and feeding a stone member is provided so as to be moved in the cross direction underneath of the wire saw by an electric motor.

Abstract: A sound arrester of a circular blade which is able to be rotated around an axis substantially disposed horizontally for cutting stone or the like is provided. The sound arrester includes a cover portion for covering approximately the upper half portion of the blade, a tank portion which is disposed under the cover portion and has a long elongated hole at the bottom thereof so as to pass the lower portion of the blade therethrough, and liquid supplying means for supplying liquid into the tank portion whereby a space surrounded by the cover portion is able to be cut off from outer atmosphere.