Automatic inside-diameter measuring apparatus

1 . An automatic inside-diameter measuring apparatus comprising:

an inside-diameter measuring part;

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, wherein

the inside-diameter measuring part includes:

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.

2 . The automatic inside-diameter measuring apparatus according to claim 1 , wherein the inside-diameter measuring part is installed with the tip side facing upward.

3 . The automatic inside-diameter measuring apparatus according to claim 1 , wherein a workpiece stopper having a support surface supporting the workpiece is provided outside the cylinder case part and closer to a base end side from a position at which the contact point is provided.

4 . The automatic inside-diameter measuring apparatus according to claim 3 , wherein the support surface of the workpiece stopper is an elastic member or is supported by an elastic member.

5 . The automatic inside-diameter measuring apparatus according to claim 3 , wherein 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.

6 . The automatic inside-diameter measuring apparatus according to claim 3 , wherein

the workpiece stopper includes:

a cylinder housing part fixed to an outside of the inside-diameter measuring part; and

a spring provided inside the housing part to surround the outside of the inside-diameter measuring part, and

the support surface is supported by the spring.

7 . The automatic inside-diameter measuring apparatus according to claim 1 , wherein a guide member having a diameter smaller than a diameter of a tip end face of the cylinder case part is provided on the tip end face of the cylinder case part.

8 . The automatic inside-diameter measuring apparatus according to claim 7 , wherein the guide member is conical.

9 . An automatic measuring apparatus comprising:

the automatic inside-diameter measuring apparatus according to claim 1 ; and

an outside-diameter measuring part configured to measure an outside dimension of the workpiece, wherein

the outside-diameter measuring part includes:

a movable element provided to be displaceable with respect to a fixed element and configured to move forward and backward to be brought into contact with or away from an outer surface of the workpiece;

a displacement detection part configured to detect displacement of the movable element; and

an automatic operation unit configured to automate the forward and backward movement of the movable element by power.

10 . 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.

11 . The inside-diameter measuring apparatus according to claim 10 , wherein a guide member having a diameter smaller than a diameter of a tip end face of the cylinder case part is provided on the tip end face of the cylinder case part.

12 . 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.