Patent ID: 7931229

Claim:
A rolled medium supporting mechanism for supporting a rolled medium to be rotatable around a roll shaft, the rolled medium supporting mechanism comprising: a supporting member having a substantially cylindrical shape with a plurality of rectangular-shaped window portions provided therein and having pin attachment portions; a plurality of pins disposed in the pin attachment portions and extending in an axial direction from the supporting member; a flange member formed integrally and concentrically with the supporting member and having a circular dish-like shape and which makes abutting contact with an edge of the rolled medium, the flange member having a circular hole and a cutout portion formed in an end face center of the circular dish-like shape; an opening/closing member having a substantially circular dish-like shape having a first end face having a plurality of cam holes and a handle portion which enables a user to rotate the opening/closing member, a second end face of the opening/closing member having a shaft portion which extends through the circular hole of the flange member and which is disposed inside the supporting member; and a plurality of blade members arranged in the circumferential direction of the supporting member, each member of the plurality of blade members having a substantially rectangular shape in which a first edge thereof is supported by the plurality of pins extending from the pin attachment portions of the supporting member in the axial direction, an end facing the opening/closing member, the end having a plurality of cam pins formed therein which extend through the cam holes of the opening/closing member, while a second edge of the plurality of blade members is capable of moving in the circumferential direction from the supporting member from the rectangular-shaped window portions towards the outer circumference of an inner peripheral face of the flange member in order to make abutting contact with a inner peripheral face of the hollow shaft portion of the rolled medium as the handle portion of the opening/closing member is rotated by the user, causing the cam pins of the blade members to be guided from a first position in the cam holes to a second position; wherein the opening/closing member causes the blade members to move from a position where the expandable abutting members block the rectangular-shaped window portions of the supporting member are concentric with an outer surface of the supporting member by causing the second edge to move away from the supporting member a predetermined angle in accordance with an inner diameter of the hollow shaft portion of the rolled medium, wherein the cutout portion of the flange member prevents the blade members from interfering with each other as they are moved.