To solve a problem in which there is a possibility to erroneously operate a bobbin handling device by detecting an object other than a tray or a bobbin by a sensor, in a structure in which the bobbin handling device of a bobbin handling section is provided with the sensor detecting the presence or absence of the object and the bobbin handling device is operated according to the detection of the tray or bobbin.

A controller 8 performs operational control for operating a bobbin extracting device 23 with respect to the bobbin extracting device 23, when main sensors 6, 7 provided correspondingly to the bobbin extracting device 23 and an auxiliary sensor 6 arranged upstream in the conveyance path of the main sensors 6, 7 detect the presence of the tray 5 or bobbins 3, 4 with temporal difference according to the length of a main bobbin conveyance line 12 from a detection position P4 corresponding to the main sensors 6, 7 to a detection position P3 corresponding to the auxiliary sensor 6.