Gear-box may include driving gear, intermediate gear, driven gear. The driving device can be around first axle. The gear unit. The idle pulley unit may include that the first idle gear is interlocked in driving gear, and the second idle pulley is co-axially mounted. First and second idler gears can be around the second shaft and first rotating shaft. Driven gear can be interlocked to be co-axially mounted with the second idle pulley. Therefore, it is very easy to adjust backlash in idle pulley unit driving gear and driven gear, because idle pulley unit is to be incorporated into the driving gear and driven gear separably and noise generation can be suppressed from idle pulley unit. ;The 2016 of copyright KIPO submissions
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