Automatic inside-diameter measuring apparatus

An inside-diameter measuring apparatus comprising:

• an inside-diameter measuring part including a contact point configured to move forward and backward in a direction intersecting a cylinder axis of a cylinder case part at a tip side of the cylinder case part, and a displacement detection part configured to detect displacement of the contact point;
• and
• a workpiece stopper provided outside the cylinder case part and closer to a base end side from a position at which the contact point is provided, wherein
• the workpiece stopper has a support surface supporting a workpiece outside the cylinder case part,
• the support surface of the workpiece stopper is an elastic member or is supported by an elastic member, and
• the workpiece stopper is configured to follow a change in posture or position of the workpiece to allow an inclination or a position of the support surface to change.

A control method for an automatic inside-diameter measuring apparatus, the automatic inside-diameter measuring apparatus including:

• an inside-diameter measuring part including a contact point configured to move forward and backward in a direction intersecting a cylinder axis of a cylinder case part at a tip side of the cylinder case part, an electric drive unit configured to move the contact point forward and backward, and a displacement detection part configured to detect displacement of the contact point;
• a moving means for relatively moving a workpiece having a hole to be measured with respect to the inside-diameter measuring part to insert and retract the inside-diameter measuring part into and from the hole to be measured;
• and
• a control unit configured to control operation of the inside-diameter measuring part and the moving means, the control method comprising:
• drive-controlling, by the control unit, the moving means to release the workpiece above the cylinder case part in such a manner that a guide member, the guide member having a diameter smaller than a diameter of a tip end face of the cylinder case part and being provided on the tip end face of the cylinder case part, is inserted into the hole in the workpiece;
• and
• causing, by the control unit, the inside-diameter measuring part to measure the workpiece supported by a workpiece stopper, the workpiece stopper having a support surface supporting the workpiece and being provided outside the cylinder case part and closer to a base end side from a position at which the contact point is provided, wherein
• the inside-diameter measuring part is installed with the tip side facing upward.