shown in fig3 are transferred in the direction of arrow 76 in fig1 on the spinning bobbin delivery line 4 located above the machine base until the head spinning bobbin on the conveyance line reaches the position of the delivery device 67 whereupon the transfer is once stopped then upon issuance of a spinning bobbin request signal from the winder 2 side the delivery device 67 operates to transfer one spinning bobbin onto the conveyance line 10 which bobbin is conveyed in the direction of arrow 77 the spinning bobbin request signal may be an operated signal from the delivery device 67 on the return line 9 so that one empty bobbin may be transferred upward by the lifting device 18 on the winder side on the basis of discrimination as to of which kind the empty bobbin delivered is only the delivery device 67 on one side out of the spinning frames 1a and 1b operates alternatively the spinning bobbin request signal may be a signal from the empty bobbin arrival sensor 66 in fig8 provided when an empty bobbin discharged from the winder side arrives at the position of the empty bobbin lowering device 14 or 15 in the corresponding spinning frame to thereby operate the delivery device 67 on the side of the spinning frame 1a concerned in this case the foregoing sorting mechanism is not needed and thus a practical merit is obtained when a spinning bobbin on the spinning bobbin conveying line 10 reaches the position of the lowering device 17 it is transferred down onto the spinning bobbin supply line 8 on the winder side by the device of the same construction as in fig5 more particularly in fig6 after transfer of the tray.