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US 9,849,551 B2Granted
Tool gripping mechanism
AssigneeFanuc Corporation
InventorsKenzo Ebihara, Takeshi Ooki
Life of this patent
Estimating the term…
Abstract
A tool gripping mechanism includes a tool holder and a shaft to which the tool holder is attached. The shaft is fixed to a rotary shaft of a spindle device. A plurality of magnets are disposed in pairs on concentric circles on surfaces of the tool holder and the shaft which face each other. When the tool holder is in a specific phase with respect to the shaft, the magnets of the tool holder and the magnets of the shaft attract each other, and the tool holder is aligned with respect to the shaft in that phase.
Claims12
A tool gripping mechanism, comprising:
- a tool holder to which a tool can be attached;
- and
- a shaft to which the tool holder is attached, the shaft being fixed to a rotary shaft of a spindle device,
- wherein the tool holder and the shaft include a first surface and a second surface, respectively, the first and second surfaces facing each other,
- at least two magnets are disposed in the first surface of the tool holder, and at least one of the at least two magnets has pole directions different from those of the other of the at least two magnets,
- magnets are disposed in the second surface of the shaft to be located at positions corresponding to the magnets disposed in the first surface and to generate magnetic forces in directions in which the magnets disposed in the first surface are attracted,
- less than half of the magnets disposed in the second surface of the shaft have a first magnetic pole facing the first surface of the tool holder, and
- more than half of the magnets disposed in the second surface of the shaft have a second magnetic pole facing the first surface of the tool holder, the second magnetic pole opposite to the first magnetic pole.
5 more elements
Dependencies are inferred from the claim text.