Patent ID: 8028590

Claim:
A traction force control method for a traction apparatus that applies to a body to be pulled a desired traction force via a traction mechanism that includes a fixture and a wire, the method comprising: a first traction control step of winding up a slack portion of the wire by a drive mechanism to eliminate slack of the wire connected to the body to be pulled; a second traction control step of converting a set traction force set by an operation portion to a traction amount to calculate a converted value and, by defining a predetermined amount of a traction amount set based on the converted value as an initial target value, winding up the wire continuously by the drive mechanism to the initial target value; and a third traction control step of calculating a drive stop time of the drive mechanism by defining the set traction force as a final target value based on a detected output of a traction force sensor that detects the traction force that is applied to the body to be pulled and driving the drive mechanism, and stopping driving of the drive mechanism at a point of reaching the drive stop time.