Adjustable power transmission belt and method

(57) while being made so that it may especially be used for a summary high-speed power transmission device, the endless belt (10) which may be easily formed in the length of any requests on the spot, It consists of polymer materials (12) of flexible and strong outside length, being near the inner side surface (16) of the above-mentioned belt (10), and piercing through the above-mentioned belt (10) from the outside surface (15) of the above-mentioned belt (10), -- 延在する -- with the slot (18) of the direction of Nagate, It has a reinforcement ribbon (14) of a flexible and strong material inserted in the slot (18) in the material (12) of outside length through a radial slit (20). The above-mentioned slit (20) -- the slot (18) of the direction of Nagate in the outside surface (15) to the above-mentioned belt (10) -- 延在する. Some reinforcement ribbons (14) in the above-mentioned slot (18) cross the end where the material (12) of outside length contacts -- 延在する -- while -- it overlaps with the 2nd portion of the reinforcement ribbon in the above-mentioned slot (18), and is combined with it by adhesives.