Patent ID: 9517513
Filing Date: 2016-12-13
CPC Classification: B23B,Y10T

Claim Text:
1. A drill driving apparatus comprising: a tool driving mechanism configured to hold a tool and apply a rotation operation and a feeding operation in a tool axis direction to the tool; and a driving mechanism fixing instrument, having a through hole through which the tool passes, configured to be inserted detachably into a guiding through hole from only a tool side in order to fix the tool driving mechanism to a drill jig in which the guiding through hole is formed, wherein the driving mechanism fixing instrument has a guide that has a smaller outer shape than the guiding through hole in order to be able to be inserted into the guiding through hole, the guide widening in an interior of the guiding through hole in a radial direction of the guiding through hole when the tool driving mechanism is rotated relative to the drill jig in an opposite direction to a rotation direction of the tool, wherein the driving mechanism fixing instrument is configured to sandwich the drill jig by pressing the guide against a chamfer formed in a workpiece side of the guiding through hole, the chamfer being formed to fit with the guide when the outer shape of the guide widens, wherein the driving mechanism fixing instrument is fixed to the drill jig when the tool driving mechanism is rotated relative to the drill jig in the opposite direction to the rotation direction of the tool, and wherein the driving mechanism fixing instrument comprises: a first guide having a surface that contacts the drill jig, wherein the surface moves away from the tool driving mechanism when the tool driving mechanism is rotated relatively in the opposite direction to the rotation direction of the tool; a second guide comprising the guide that widens in an interior of the guiding through hole in a radial direction of the guiding through hole when the tool driving mechanism is rotated relative to the first guide in the opposite direction to the rotation direction of the tool; and a third guide comprising a tapered portion, the tapered portion being fixed to the tool driving mechanism and widens the guide that widens in the radial direction of the guiding through hole when the surface of the first guide that contacts the drill jig moves away from the tool driving mechanism.