Patent ID: 8152421
Filing Date: 2012-04-10
Classification: B23C,Y02P,Y10T

Abstract:
1. An apparatus for drilling a workpiece comprising: a shaft portion including a holder for holding a drilling tool rotating around a first axis; a reduction gear connected to the shaft portion; a cylindrical member including an outer cylinder and an inner cylinder for rotatably containing the shaft portion at an eccentric position, said cylindrical member connected to an output shaft of the reduction gear and rotating around a second axis parallel to the first axis; a slide containing cylinder for containing the shaft portion, the reduction gear and the cylindrical member, said slide containing cylinder including a sliding structure for axially moving the shaft portion, the reduction gear and the cylindrical member; and the drilling tool rotating around the first axis while simultaneously revolving around the second axis and moving axially, the drilling tool rotated by the rotation of the shaft portion which, in turn, rotates the input shaft that simultaneously rotates the cylindrical member, connected to the output shaft of the reduction gear, around the second axis at a predetermined reduction ratio.