Patent ID: 7266906

Claim:
A measuring tool comprising: a U-shaped body frame; an anvil provided on one end of the body frame; a movable member supported on the other end of the body frame, the movable member being advanceable and retreatable relative to the anvil in the axial direction; and a feeding mechanism for feeding the movable member, the movable member being forward fed toward the anvil to hold a workpiece with the anvil and the movable member, where a dimension or a profile of the workpiece is measured from the displacement of the movable member; wherein the feeding mechanism includes: an outer roller rotatably supported on the body frame; a forward feed roller disposed between the outer roller and the movable member at a position closer to the anvil relative to the outer roller, the forward feed roller being rotatable around an axis parallel to the axis of the outer roller to forward feed the movable member; a reverse feed roller disposed between the outer roller and the movable member at a position remote from the anvil relative to the outer roller, the reverse feed roller being rotatable around another axis parallel to the axis of the outer roller to reverse feed the movable member; a feed roller holding member provided on the body frame, the feed roller holding member supporting the forward feed roller and the reverse feed roller in a manner respectively movable along a circumference around the axis of the outer roller; a biasing mechanism that respectively biases the forward feed roller and the reverse feed roller in a direction in which outer periphery of the forward feed roller and the reverse feed roller comes into contact with the movable member; and a power transmitter that connects the outer roller to the forward feed roller and the reverse feed roller respectively, so that the rotation of the outer roller is transmitted to the forward feed roller and the reverse feed roller.