To perform doffing treatment at sufficient working efficiency by traveling/moving a doffing machine without waste even when requirement of doffing treatment is made from two units existed in a mutual interference position in an automatic winder device.

Traveling of both doffing machines 4a, 4b is controlled making two elements of progress situation of full bobbin package preparation of the units 2, 2 and a distance from the present positions of the respective doffing machines 4a, 4b to the units 2, 2 as determination reference. Thereby, even when treatment requirement for doffing is advanced from the two units 2, 2 existed at the mutual interference position, since a preferential lank of the doffing treatment of the doffing machines 4a, 4b relative to the units 2, 2 is previously determined and both doffing machines 4a, 4b can be traveled/moved with a constant distance, inconvenience that the doffing machines 4a, 4b wastefully travel such that the doffing machines 4a, 4b stop/reversal travel after the doffing machines 4a, 4b approach to the other doffing machines 4a, 4b can be certainly eliminated.

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