Yarn feed device

1. Yarn feed device for the workstations of twisting or cabling machines, which have yarn brakes particular to the workstation to produce a yarn tension in the outer yarns, characterized in that the yarn feed device ( 13 ) is a component of a retrofittable supplementary assembly set ( 12 ) which can be fixed to walls ( 24 , 25 ) of adjacent workstations ( 2 ) and has two separately activatable drives ( 27 A, 27 B), to which a yarn friction wheel ( 14 ) is connected, in each case, to act on an outer yarn ( 5 ).

2. Yarn feed device according to claim 1 , characterized in that the supplementary assembly set ( 12 ) has at least one drive ( 27 A, 27 B), which can be activated in a defined manner, to rotate a yarn friction wheel ( 14 ) of the yarn feed device ( 13 ).

3. Yarn feed device according to claim 1 , characterized in that the supplementary assembly set has a housing ( 26 ), with which it can be fixed to the walls of adjacent workstations ( 2 ).

4. Yarn feed device according to claim 2 , characterized in that the drives ( 27 A, 27 B) are connected by control lines ( 28 ) to controller boxes ( 9 ′) particular to the workstation, which are connected by a data bus to a central control mechanism ( 9 ) at the twisting or cabling machine ( 1 ).

5. Yarn feed device according to claim 2 , characterized in that the drives ( 27 A, 27 B) can be activated to rotate the friction wheel ( 14 ) in such a way that the yarn speed is set to achieve the aimed for yarn tension of the outer yarns ( 5 ).

6. Yarn feed device according to claim 4 , characterized in that the yarn speed of the outer yarns ( 5 ) can be changed by means of the drives ( 27 A, 27 B) both in the direction of “accelerate” and in the direction of “brake”.

7. Yarn feed device according to claim 2 , characterized in that the drives ( 27 A, 27 B) are configured as stepping motors.

8. Yarn feed device according to claim 1 , characterized in that the supplementary assembly set ( 12 ) is arranged in the yarn running path of two outer yarns ( 5 ) in such a way that the yarn friction wheels ( 14 ) of the supplementary assembly set ( 12 ) are in each case arranged in the yarn running direction (F) behind the yarn friction wheels ( 30 ) of the existing yarn brakes ( 11 ) particular to the workstation.

9. Yarn feed device according to claim 8 , characterized in that the control mechanism ( 9 ) for the drives ( 27 A, 27 B) and/or controller boxes ( 9 ′) are configured in such a way that they only set the respective yarn tension after a workstation ( 2 ) has been run up to speed and during the subsequent twisting or cabling operation by means of the yarn feed device ( 13 ) of the supplementary assembly set ( 12 ).

10. Yarn feed device according to claim 9 , characterized in that the control mechanism ( 9 ) is integrated in the existing central control mechanism ( 32 ).

11. Yarn feed device according to claim 1 , characterized in that the drives 27 A, 27 B have motor shafts inclined to promote transfer of the outer yarns 5 from the yarn friction wheels 14 .