Patent ID: 8910899

Claim:
A core tube holding device for holding a cylindrical core tube extending in the axial direction, in a state where an inner peripheral surface of the core tube has been pressed out in a radially outward direction orthogonal to the axial direction, the core tube holding device comprising: a plurality of out-pushing members that are arranged side by side spaced apart in the axial direction, each of the out-pushing members having a pressing part that faces radially outward; a connecting member for connecting the plurality of out-pushing members; a holding member that has a pressed part facing the pressing part in the axial direction at every position in the axial direction corresponding to the pressing parts, and that is disposed radially outward with respect to the plurality of out-pushing members; and an action unit adapted to exert a force for moving, to one side in the axial direction, a one end out-pushing member which, among the plurality of out-pushing members, is at an end on the one side; wherein at least one from among the pressing parts and the pressed parts is formed in a tapered shape that spreads radially outward from the one side to the other side in the axial direction, and when the force for moving the one end out-pushing member acts thereon via the action unit, the one end out-pushing member moves to the one side while also pulling another out-pushing member among the plurality of out-pushing members via the connecting member, and the pressing parts of each of the out-pushing members push the holding member radially outward via the corresponding pressed parts.