Cooling device

A cooling device, comprising:

• a cooling roller that contacts a sheet-like member to cool down the sheet-like member;
• and
• a cooling medium feeding/retrieving unit that feeds a cooling medium to the inside of the cooling roller from a feed port disposed in the cooling roller and retrieves the cooling medium drained to the outside of the cooling roller from a drain port disposed in the cooling roller,
• wherein the cooling roller has a dual tube structure in which an inner tube is disposed inside an outer tube and which has an outside flow passage in which the cooling medium flows through a space between the outer tube and the inner tube and an inside flow passage in which the cooling medium flows inside the inner tube, and an opening that causes the outside flow passage to communicate with the inside flow passage is formed in a middle of the inner tube in a longitudinal direction of the cooling roller, and
• wherein a first passage in which the cooling medium fed by the cooling medium feeding/retrieving unit flows through the outside flow passage from one end side to the other end side of the cooling roller and flows into the inside flow passage through the opening and a second passage in which the cooling medium fed by the cooling medium feeding/retrieving unit flows through the outside flow passage from the other end side to the one end side of the cooling roller and flows into the inside flow passage through the opening are formed.

A cooling device, comprising:

• a cooling roller that contacts a sheet-like member to cool down the sheet-like member;
• and
• a cooling medium feeding/retrieving unit that feeds the cooling medium to the inside of the cooling roller from a feed port disposed in the cooling roller and retrieves the cooling medium drained to the outside of the cooling roller from a drain port disposed in the cooling roller,
• wherein the cooling roller has a dual tube structure in which an inner tube is disposed inside an outer tube and which has an outside flow passage in which the cooling medium flows through a space between the outer tube and the inner tube and an inside flow passage in which the cooling medium flows inside the inner tube, and an opening that causes the outside flow passage to communicate with the inside flow passage is formed in a middle of the inner tube in a longitudinal direction of the cooling roller, and
• wherein a first passage in which the cooling medium fed by the cooling medium feeding/retrieving unit flows through the inside flow passage, flows into the outside flow passage through the opening, and flows toward at least one end side of the cooling roller and a second passage in which the cooling medium fed by the cooling medium feeding/retrieving unit flows through the inside flow passage, flows into the outside flow passage through the opening, and flows toward at least the other end side of the cooling roller are formed.