... cable 2. a synchronizing operation with the moving device. FUNCTION DJ1D type constant tension cable reel drum are ... drum do not slip down.Working principle:DJ1D has two kinds operation conditions:1, Power supply is at ... the device and cable reel drum.For the small type cable reel drum(DJ1D-I,II,III,IV), ... in the opposite direction,and move the drum with clockwise,the Curly torque will be increased,on ...