| 摘要 |
A head carriage apparatus includes an upper arm provided with a magnetic head and a head carriage main unit that supports the upper arm in the state where it can be displaced in the upwards and downwards direction. The head carriage apparatus also includes an engagement member that engages with the upper arm when the upper arm is displaced by a predetermined amount in the upwards direction and around the center of displacement formed by the position of support to the head carriage main unit, wherein the upper arm is rotationally displaced further around the center of displacement formed by the engagement position of this engagement member and the upper arm.
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