Tool-positioning method, tool-positioning device and power feeder for tool positioning

A tool-positioning device for positioning a tip end of a tool relative to a center axis of a bar, comprising:

• a flexible strip member having a conducting front side and an insulating back side;
• a wrapping mechanism for keeping said strip member wrapped on an external peripheral surface of a bar to be machined, the bar being fixedly disposed at a machining work position, with said back side of said strip member being closely attached to the external peripheral surface;
• a driving mechanism for bringing a tool to be positioned into contact with said front side of said strip member;
• a power feeding mechanism for allowing an electric current to flow between the tool and said front side of said strip member at a time of a mutual contact;
• a contact-position deciding section for detecting a conduction between the tool and said front side of said strip member caused due to said power feeding mechanism, to decide a position of a contact point with the tool;
• and
• a corrective processing section for determining a position of a center axis of the bar on the basis of the position of the contact point with said tool as decided, and suitably correcting predetermined machining-position data of said tool in accordance with the position of the center axis of the bar as determined.

A tool-positioning device for positioning a tip end of a tool relative to a center axis of a bar, comprising:

• a flexible strip member having a conducting front side and an insulating back side;
• a wrapping mechanism for keeping said strip member wrapped on an external peripheral surface of a bar to be machined, the bar being fixedly disposed at a machining work position, with said back side of said strip member being closely attached to the external peripheral surface;
• a driving mechanism for bringing a tool to be positioned into contact with said front side of said strip member;
• a power feeding mechanism for allowing an electric current to flow between the tool and said front side of said strip member at a time of a mutual contact;
• a contact-position deciding section for detecting a conduction between the tool and said front side of said strip member caused due to said power feeding mechanism, to decide a position of a contact point with the tool;
• and
• a positioning member for mechanically positioning a tip end of the tool relative to a center axis of the bar to be machined, on the basis of the position of the contact point with the tool as decided.

A power feeder for tool positioning, for positioning a tip end of a tool relative to a center axis of a bar, comprising:

• a flexible strip member having a conducting front side and an insulating back side a
• wrapping mechanism for keeping said strip member wrapped on an external peripheral surface of a bar, with said back side of said strip member being closely attached to the external peripheral surface;
• and
• a power feeding mechanism electrically connected to said front side of said strip member.