| 摘要 |
PROBLEM TO BE SOLVED: To provide a feeder system of a crane high in reliability maintaining tensile force of a rope for traction of a cable carrier constant, not applying traction force directly on a cable and preventing removal of a drum from a roller even in the case where sagging occurs on the cable. SOLUTION: A rope tensile force detection means 12 provided on a rope 9 for traction of a cable carrier 20 to hold a cable 5 to transmit electric power source for motive power and a signal for control to a trolley 7 to reciprocally move on a girder 1 of a crane free to deform in accordance with movement of the trolley 7, an adjuster mechanism 13 to adjust a position of a cable drum 2 provided on the cable carrier 20 so as to maintain this rope tensile force constant and a cable sagging detection means 14 to detect sagging quantity of the cable are furnished.
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