Patent ID: 7090569

Claim:
A clutch device for a roller sander for controlling reciprocating movement of a roller, said roller sander comprising: a base set provided with a conveyer at a preset position and a motor fixing frame at its one side; a motor set fixed at an outer side of said motor fixing frame and having a shaft and a belt wheel fixed on said shaft; a roller set fixed at an inner side of said motor fixing frame and an upper side of said conveyer and composed of a lower member, an upper member and a sanding cloth wheel, said lower member fixed on said motor fixing frame, said upper member positioned above and in parallel with said lower member and pivotally connected with said sanding cloth wheel at its two sides respectively to be able to move axially together, said sanding cloth wheel driven to rotate by said shaft of said motor set; a linking device set at the inner side of said motor fixing frame and pivotally connected with said upper member of said roller set and enabling said upper member to reciprocate axially; and said clutch device composed of a belt wheel, a connecting shaft and an adjusting button, said belt wheel pivotally connected with said connecting shaft and mounted around by said belt that mounts around said belt wheel of said motor set as well, and provided with a preset number of fixing grooves spaced apart in a circle at its front end, said connecting shaft bored with a center hole for a rear end of said adjusting button to fit therein and fixed with said linking device at its other end, said adjusting button pivotally connected with a front section of said connecting shaft and provided with a fixing bar fitted transversally and movably in a slot bored in an annular outer surface of said connecting shaft, said fixing bar able to fit in one of said fixing grooves of said belt wheel when said adjusting button is pulled out for a certain distance.