Device for maintaining a yarn in a spooler

A winder comprising:

• a frame including at least one spindle configured to support at least one package, the spindle rotating about a first axis approximately perpendicular to the diameter of the package so as to draw and wind thereon at least one strand in a form of a package;
• at least one traversing positioning and guiding device configured to position and guide the at least one strand on the rotating spindle, the device configured to move closer toward or further away from the package while the at least one strand is being wound;
• and
• a keeper configured to engage the at least one strand at a location upstream of the positioning and guiding device relative to a direction of movement of the at least one strand being wound on the rotating spindle, to alter the path of the at least one strand at the location upstream of the positioning and guiding device and thereby to keep the at least one strand in contact with the positioning and guiding device, the keeper being mounted so as to rotate relative to a second axis approximately parallel to the first axis of rotation and including a bar supported by an arm articulated about the second axis of rotation, the arm being controlled angularly by an indexer to keep the at least one strand in contact with the traversing positioning and guiding device.