PROBLEM TO BE SOLVED: To prevent one end part 11 of a guide body from being excessively pressed to a power transmission wheel 5 following the extension of an endless belt-like body in a tension device in which the endless belt-like body 7 is wound and hung between a power transmission wheel 4 on the main drive side and the power transmission wheel 5 on the driven side, the guide body 8 constituted so as to be extended along the endless belt-like body is brought into contact with the outer peripheral face of a part to be a slack side between both of the power transmission wheels in the endless belt-like body, and one end 11 of the guide body is pressed excessively and energized inwardly with a tensioner 10 such as a spring, following the elongation of the endless belt-like body.;SOLUTION: The tension device is so constituted that when the one end part comes in contact with the power transmission wheel by the inward movement of the guide body, the one end part 11 of the guide body is separated from the power transmission wheel.;COPYRIGHT: (C)2005,JPO&NCIPI
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