COUPLING DEVICE

摘要

PURPOSE: A coupling device is provided to make a second coupler rotate freely for easy coupling by alternately aligning ribs of the second coupler with ribs of a first coupler, thereby preventing the malfunction or failure caused by the mis-coupling between couplers. CONSTITUTION: A coupling device includes a first coupler(40) having a first cylindrical body(41) and a plurality of first ribs(43) protruded by a predetermined interval on an inner periphery of the first body, a second coupler(50) having a second body(51) slidingly inserted into or withdrawn from the first body of the first coupler at an end and a plurality of second ribs(53) protruded by a predetermined interval on an outer periphery of the second body to be engaged with the first ribs, and a driving gear(60) coupled with the second coupler to freely and rotate by a predetermined angle together with the second coupler, thereby transmitting power.