Toothed belt including wedge zone, nearly 20 years in the industrial development is very rapid, developed countries are constantly erosion of traditional metal gear, chain and flat belts and v-belts rubber market. Zui nearly circular toothed belt than the toothed belt, further increases the momentum and silence, as a new generation of green belt, the scope of its use more widely. Now, has started to become very strict with synchronous transmission, noise of household and industrial sewing machine, the typewriter, use object of the duplicator. Tags: three guinness triangle toothed v-belts