| 摘要 |
PROBLEM TO BE SOLVED: To easily remove a web roll from a core pipe without causing a local deformation even when an external force is applied during mounting of the web roll, by forming a sliding surface of a claw in a tapered shape so that a center in the width direction is deep and both ends in the width direction are shallow, and forming the lower surface of the claw in the tapered shape according to the shape of the sliding surface. SOLUTION: In a tapered groove 6 becoming deeper toward the axial tips provided at a plurality of positions on the peripheral surface of the tip of a chuck shaft 2, a sliding surface 15 is formed in a tapered shape so that a center in the width direction is deep and both ends in the width direction are shallow, and the center in the width direction forms a further drilled locking groove 17. A claw 3 is provided in the chuck shaft 2 in a state where it is engaged with the tapered groove 6. When a bending force is applied to the claw 3, the lower surface 14 of the claw 3 broadly abuts on the bottom 15 of the tapered groove 6, so that the claw 3 does not locally generate butting local deformation on a side surface 18 of the tapered groove 6. The claw 3 easily moves along the tapered groove 6 with a pressing force of a compression spring, so that a chuck 1 can be easily removed from a core pipe of a web roll.
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