Patent DE-10145312-A1 (DE)
Title: Melt spinning and winding assembly, has a feed unit in the filament path to the winder, with a powered roller in a truncated cone shape and with filament guide sections, to take the filament according to its tension for correction
Inventor: KUDRUS HEINER
IPC: D01D7/00
Filed: 2001-09-14
Abstract: Melt spinning and winding assembly, has a feed unit in the filament path to the winder, with a powered roller in a truncated cone shape and with filament guide sections, to take the filament according to its tension for correction. The assembly for melt spinning and winding polymer filaments has a deflection roller in the filament path, at the feed to the winder, with a truncated cone guide section. The laying point for the filament at the roller guide section, as its start, is determined by the filament guide according to the actual filament tension. On a difference between the actual filament tension and a nominal value, the filament start position at the roller guide section is moved towards the smaller or larger diameter of the roller as appropriate. The filament guide unit has a reciprocating guide moving across the filament path, with a spring (19) so that the filament tension bears against the spring with a variable force to give it the required setting at the roller guide section appropriate to the tension level. The spring force gives a balanced setting between its action and the filament tension. The filament guide is a rod, to lead the filament at its free end, with a spring at the rod holder. The filament guide rod can pivot on a common swing axis and lead the filaments at both free ends. One end of the rod guides the filament at the start of the roller guide section, and the other end of the rod is for the filament at the end of the roller guide. It works with a static filament guide to give a variable filament loop around the roller guide through the swing movement of the guide rod. A monitor has a sensor to register the position of the filament guide. The spring force can be applied by an actuator linked to a control, which gives the setting according to signals from a filament tension sensor. The filament tension sensor is before or after the deflection roller in the filament path. The control is linked to the roller drive. The filament feed unit has a second powered roller (12), with a filament guide section. Both rollers at the feed have a common drive. The guide is at a moving carrier (30), which is moved between a rest position outside the filament path and an operating position in the path of the filament. To handle a number of parallel filaments (9.1-9.4), the roller guide has a number of guide sections (17.1-17.4) and filament guides (18.1-18.4) in a row.  An Independent claim is included for a technique to alter the filament tension, where the filaments are fed at a given speed to a feed unit with at least one powered roller, to pass partially around it. The surface speed of the deflection roller is controlled according to the filament tension, to give a set relationship between the filament and roller speeds. The roller surface speeds are varied by a conical structure with guide sections at intervals along its axial line. The filament start position at the deflection roller is set by a filament guide, according to the monitored filament tension level.