guide is provided outside of the covers 19a and 19b will be described hereinafter where the take up rate of the winder is high the conventional types of balloon guides are insufficient at the point of the formation of balloon when the yarn layer on the feed bobbin decreases and in this condition the yarn is rewound from the lower yarn layer of the bobbin a large rewinding tension will be imposed on the yarn which may cause breakage of the yarn or slip off of a part of the yarn layer called sloughing to resolve the inconvenience it is preferred to use a balloon guide of the present invention the balloon guide is formed with a tapered throttling portion in a predetermined internal position of a cylindrical body an embodiment of the balloon guide of the present invention will be described hereinunder with reference to the drawings fig1 shows an example of a winding unit this embodiment is applied to a winder of the type wherein bobbins 107 are fitted on coveying trays 110 separately from one another and in this state they are supplied to winding units but it goes without saying that the invention is also applicable to a winder of the type wherein each winding unit has a magazine and bobbins are supplied to the magazines from a conveyor laid along the winding units in fig1 a winding unit 101 is supported pivotably by a pivot shaft 103 of a side frame 102 during operation of the automatic winder the winding unit 101 is also placed on and suitably fixed to a suction pipe 104 the winding unit 101 is provided with a spinning bobbin supplying device 105 in a lower position the spinning bobbin supplying device 105 has inclination toward the front of the.