公开(公告)号：JPH01141518A

公开(公告)日：1989-06-02

申请号：JP27900887

申请日：1987-11-04

Applicant: WHITE CONSOLIDATED IND INC

Inventor： IMATSUKU ERU KORINZU ,  JIERII II SUCHIYUAATO

IPC: A01D34/73

Abstract: PURPOSE: To extend a cutting rope to its suitable operational length by controlling the feed-out of an exchange rope through a mechanism to react to imbalanced centrifugal force. CONSTITUTION: When the cutting rope is broken, according to centrifugal feed- out force F1 on a cutting rope 31, resistant force F3 from the cutting rope 31 imbalances reference centrifugal force F2 on a balance arm 68 with the resistant force F3 . Net force F4 is operated, the balance arm 68 is pivotally moved to the outside, and a rope spool 65 is reduced until released. The rope spool 65 first accelerated upward and next accelerated downward in axial direction while keeping resistant drag force on the cutting rope 31. When impbalancing F3 with F2 , concerning the length of a rope section extended outside, the balance arm 68 is pivotally moved upward, the rope spool 65 is fastened, and the cutting rope 31 is prevented from being fed out.