(57) A method for controlling work vehicles in a yarn processing apparatus allows work
vehicles to travel and move efficiently to execute service processes on units with
a high work efficiency even if two units located at an mutually interfering position
issue service processes, respectively. The area in which approaching work vehicles
4a, 4b may interfere with each other and fail to simultaneously execute an operational
process is defined as the "interfering area" on the basis of the width dimensions
of the unit 2 and the work vehicles 4a, 4b. When the two units 2 simultaneously issue
service process requests, respectively, the method determines, before traveling movement
of the work vehicles 4a, 4b, whether the units 2 are in the mutual interference state,
on the basis of the interfering area. Upon determining that the units 2 are in the
mutual interference state, the method measures the distances from the current positions
of the work vehicles 4a, 4b to the respective process requesting units 2, 2. Then,
one of the work vehicles 4a, 4b which is closer to the corresponding process requesting
unit 2 is preferentially allowed to execute a service process.
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