Patent ID: 8351817

Claim:
A cooling device, comprising: a cooling roller having a dual tube structure in which an inner tube is disposed inside an outer tube, and an outside flow passage in which a cooling medium flows between the outer tube and the inner tube and an inside flow passage in which a cooling medium flows inside the inner tube are formed, including an opening, formed in the inner tube, that allows the outside flow passage to communicate with the inside flow passage, and being rotatably supported to a housing of a device main body through bearings; a cooling medium transport unit that transports the cooling medium; and a rotating tube joint unit that is mounted to one end side of the cooling roller so that the cooling roller is rotatable and connects the cooling roller with the cooling medium transport unit through a pipe, wherein the cooling roller contacts a sheet-like member to cool down the sheet-like member, one end side of the outer tube is coaxially rotatably fitted into and mounted to a first fitting section of the rotating tube joint unit, one end side of the inner tube is coaxially fitted into and rotatably or fixedly supported to a second fitting section of the rotating tube joint unit, and the other end side is coaxially fitted into and rotatably or fixedly supported to a fitting section formed at the other end side of the outer tube.