To prevent tooth shape molding failure based on the positional shift of canvas at the time of spinning of a core wire in a manufacturing method of a toothed belt.
In the manufacturing method of the toothed belt provided with tooth parts and groove parts and having the canvas 1 bonded to its surface, first, the mutual end parts of the canvas 1 are sewn by a sewing machine to form a joint part 4 to form the canvas 1 into a cylindrical shape. Next, an insertion rod 10 is inserted in the joint part 4 and the cylindrical canvas 1 is mounted on a mold 11 to cover the mold 11. At this time, the insertion rod 10 is positioned with respect to the mold 11 so that the joint part 4 is positioned at one of mold groove parts 12a. Subsequently, the canvas 1 is pushed in the mold groove parts 12a by a shaping roll 51 equipped with shaping teeth 57 and the core wire 21 is further spirally wound around the canvas 1 from the outside. Thereafter, an unvulcanized rubber sheet is laminated on the canvas 1 from the outside of the core wire 21 and the whole is vulcanized and molded to form a belt sleeve and this belt sleeve is cut to obtained the toothed belt.
COPYRIGHT: (C)2007,JPO&INPIT
Makoto Suhara