| 摘要 |
PROBLEM TO BE SOLVED: To provide roundness measuring apparatus performing uninterrupted measurement by changing the measuring force of a detector without any need of suspending a measurement program, and including a small inexpensive detector.SOLUTION: A roundness measuring apparatus is equipped with: a stylus 40 having a contact part 42 at the end; a holding member 50 that moves the stylus 40 by accompanying the contact with a measurement target to displace the contact part; a wire spring 60 that presses the contact part 42 toward the measurement target object by elastic force; a detector holder 28 that supports the holding member 50 rotatably, for rotating the displacement direction of the contact part; and a motor 80 for rotating the holding member 50. An elastic force adjustment member 90 is supported so as to be rotatable and concentric with the holding member 50, and increases/decreases the amount of elastic deformation depending on the positional relation with the holding member 50. The motor 80 for rotation rotates the displacement direction of the contact part in a first rotation range of the holding member 50, and rotates the elastic force adjustment member 90 relatively to the holding member 50 in a second rotation range. |
