Patent ID: 7789442

Claim:
A disc gripping device for gripping a disc by inserting at least three gripping members into a center hole of a disc and expanding at least one of the gripping members in a radial direction to engage an inner circumferential face of the center hole, wherein the at least three gripping members include: a first gripping member having a first disc contacting face for contacting the inner circumferential face of the center hole, a length of the first disc contacting face as measured in a direction perpendicular to the thickness of the disc being greater than a thickness of the inner circumferential face of the center hole; a second gripping member having a second disc contacting face for contacting the inner circumferential face of the center hole, a length of the second disc contacting face as measured in the direction perpendicular to the thickness of the disc being equal to or smaller than the thickness of the inner circumferential face of the center hole, and a third gripping member having a third disc contacting face for contacting the inner circumferential face of the center hole, wherein all of the at least three gripping members are movable in a radial direction, wherein each of the at least three gripping members has an elastic cylinder including a shaft member and an elastic member covering an outer circumferential face of the shaft member, and wherein the respective disc contacting faces comprise at least a part of the outer circumferential face of the elastic cylinder.