Device for winding a yarn on a holder driven in rotation

1. A device for winding a yarn on a holder driven in rotation, the yarn being dispensed by a yarn guide displaceable in translational motion parallel to generatrices of the holder driven in rotation, comprising:

a carriage receiving the yarn guide and having arrangements for coupling to a transmission and flexible drive member mounted between two return elements and capable of imparting a reciprocating movement to said yarn guide, in combination with means for guidance in translational motion parallel to the generatrices of the rotary holder, the yarn guide, the guidance means and the coupling arrangements being offset angularly on the carriage according to three vertices of a triangle, the means for guidance in translational motion being arranged between the yarn guide and the coupling arrangements, and serving as a tilting axis for said carriage in order to generate an additional speed component in a vicinity of reversal points under effect of tilting of said carriage about said axis during passage of said coupling arrangements from one side of the elements to another, and the guidance means being separated from the yarn guide and from the coupling arrangements at distances which are determined so as to speed up reversal times at said yarn guide.

2. The device as claimed in claim 1 , wherein the yarn guide and the coupling arrangements are positioned at ends of two arms offset angularly at substantially 90° and forming the carriage, the two arms laying substantially in a plane parallel to a plane containing said drive member.

3. The device as claimed in claim 1 , wherein the transmission and flexible drive member comprises a notched belt mounted between the two return elements, said elements comprising gearwheels, at least one of which is driven in rotation, the coupling arrangements of the carriage being secured to a part of said belt, so as to subject the reciprocating movement to orientation of a contour of the belt.

4. The device as claimed in claim 3 , wherein the arrangements for coupling the carriage to the part of the belt comprises a connection of a pivot type.

5. The device as claimed in claim 4 , wherein the connection of the pivot type has at least one shaft carried by a fork joint gripping a cross section of the belt, said shaft being positioned between two teeth of the belt, the fork joint being connected to the carriage with a capacity for articulation.

6. The device as claimed in claim 1 , wherein the guidance means comprises a stud engaged in a rectilinear groove fonned in a thickness of a support plate, parallel to the generatrices of the holder.

7. The device as claimed in claim 6 , wherein the plate is in two parts delimiting a free space within which the carriage is displaced.

8. The device as claimed in claim 1 , wherein a major axis of a path described by the transmission and flexible drive member forms an angle with a linear guidance axis of the carriage, so that a total stroke of the yarn guide depends on said angle which is adjustable.