Patent ID: 8954999
Filing Date: 2015-02-10
Classification: B23Q,G11B

Abstract:
1. A medium holding unit for holding a plate-shaped medium, comprising: pressing members which are operable to press an inner peripheral of a hole formed on the medium and are movable between first positions where the pressing members do not come in contact with the inner peripheral and second positions where the pressing members come in contact with and press the inner peripheral; pivoting members each having one of the pressing members, each of the pivoting members is engaged with the other pivoting members so as to be interlockingly moved with each other when the pressing members are being moved toward the first positions; and urging members, each of the urging members is suspended over adjacent pivoting members and the urging members urge the pressing members to the second positions; wherein each of the pressing members is adapted to interlockingly move with each other when moving toward the first positions and each of the pressing members is adapted to move independently of each other when moving to the second positions such that each of the pressing members can move a different radial distance when moving from the first position to the second position.