Patent ID: 7082940

Claim:
A wire sawing apparatus comprising: two basic rollers disposed with their axes of rotation in parallel with each other, a plurality of cutting-positioning circumferential grooves being provided on a cylindrical surface of each of the two basic rollers and arranged in an axial direction, the cutting-positioning circumferential grooves of one basic roller and the corresponding cutting-positioning circumferential grooves of the other basic roller being paired and located at the same axial positions; a wire feed roller disposed with its axis of rotation not located on a plane including the axes of rotation of the two basic rollers and with its axis of rotation in parallel with the axes of rotation of the two basic rollers, a plurality of intermediate circumferential grooves being provided on a cylindrical surface of the wire feed roller and arranged in the axial direction, axial positions of the intermediate circumferential grooves each corresponding to a substantially axially central position between two adjacent pairs of cutting-positioning circumferential grooves; and a wire spirally wound a plurality of turns around the two basic rollers and the wire feed roller from a first end to a second end with respect to the axial direction by repeating a unit winding operation of winding the wire in such a manner that the wire is fitted into one pair of two adjacent pairs of cutting-positioning circumferential grooves, the one pair being located on a side toward the first end, is fitted into an intermediate circumferential groove corresponding to the adjacent pairs of cutting-positioning circumferential grooves, and is then fitted into the other pair of cutting-positioning circumferential grooves located on a side toward the second end; wherein a plurality of linear portions of the wire extending between the two basic rollers are arranged at axial positions corresponding to the pairs of cutting-positioning circumferential grooves and are caused to reciprocate in their own linear directions along with a rotary movement of the three rollers to cut into an object to be cut, thereby cutting the object simultaneously at a plurality of positions.