| 摘要 |
The present invention relates to a tension roller having the function of preventing warpage. The technical problem to be solved according to the present invention is to provide a tension roller having the function of preventing warpage via compound stress such as tensile stress, compressive stress and/or air pressure. For such purpose, the present invention provides a tension roller comprising: a pipe-shaped first shaft for exerting a first stress in a first direction; a second shaft combined inside the first shaft and exerting a second stress in a second direction opposite to the first direction; and a stress supply part combined with the first shaft and the second shaft so that the first stress can be exerted on the first shaft in the first direction and the second stress can be exerted on the second shaft in the second direction. |
