the forward conveyor 11 must necessarily advance into or should bypass the working process line 12 meanwhile the tab reader 30 on the upstream side of the branch points 13b can select one of the stock conveyors 13a in the stock line 13 for each type of yarns of cops in an occupied magazine and consequently the stock conveyors 13a can individually store thereon occupied magazines selected for individual types of yarns further the tab reader 30 on the upstream side of the branch lines 15a can select a specific winder wj in accordance with an individual type of a yarn a tab clearer 50 is disposed intermediately of the return conveyor 43 which forms part of the empty magazine conveyor system 40 the tab clearer is provided to clear the tab code set in the tab device of an empty magazine to assure the reliability of a resetting operation of a tab code by the tab setter 20 a cop supplied to a winder wj from a corresponding cop feed device 15b is at first subjected to a yarn end picking up operation by the yarn end pickup device wja of the winder wj and is then set for working on the winder wj on which it is rewound for example into a cheese like configuration whereafter it is discharged to a next step by means of a conveyor system not shown on the other hand an empty bobbin hereinafter referred to.