Tool driving device, tool driving method, and tool feeding mechanism for tool driving device

A tool driving method comprising:

• positioning a cylinder mechanism relative to a workpiece using a positioning mechanism that is coupled either directly or indirectly to a cylinder tube of the cylinder mechanism by two parallel shafts disposed to be symmetric about a tool axis such that a plane in which the tool axis extends intersects both parallel shafts, an axis of a rod of the cylinder mechanism being aligned with the tool axis, the positioning mechanism being adapted for fixation to a drill jig attached to the workpiece during drilling, the positioning mechanism having a bushing tip adapted to be inserted into a guide hole of the drill jig;
• holding a tool by a handheld tool rotation driving device, and holding the handheld tool rotation driving device externally of the cylinder tube by fixing the handheld tool rotation driving device to a rod side of the cylinder mechanism, such that movement of a piston provided in the cylinder tube of the cylinder mechanism moves the handheld tool rotation driving device;
• supplying a fluid to a first supply port of the cylinder mechanism to cause the piston to advance along a tool axis direction, thereby moving the handheld tool rotation driving device to advance along the tool axis direction;
• switching, via a switching mechanism attached to the cylinder mechanism, a supply destination of the fluid supplied to the cylinder mechanism from the first supply port of the cylinder mechanism to a second supply port of the cylinder mechanism;
• and
• supplying fluid to the second supply port of the cylinder mechanism to cause the piston to retreat along the tool axis direction, thereby moving the handheld tool rotation driving device to retreat along the tool axis direction, wherein
• switching the supply destination of the fluid between the first supply port and the second supply port is effected based on reception of an input at an operating valve of the switching mechanism, the input being an input fluid that also drives rotation of a tool held by the handheld tool rotation driving device and which is supplied from a common supply source as the fluid that is being switched between the first supply port and the second supply port.