Rotating winch for stranding lines

Details Rotating winch for stranding lines Rotating winch for stranding lines

1999-09-09

2001-10-16

Falik, Andy (Department: 3765)

Textiles: spinning, twisting, and twining

Apparatus and processes

With drafting

C057S058520, C057S058830, C057S098000, C057S311000, C226S190000

Reexamination Certificate

active

06301871

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a rotating winch, and particularly to a rotating winch that can be used in stranding lines in order to pull the strand coming from the compacting die and to release it in tension to a stranding machine, particularly to a double-twist stranding machine.
Rotating winches for stranding lines are known to comprise generally a hollow rotor wherein a motor suitable for rotating a drawing cylindrical drum around an axis perpendicular to the axis of rotation of the rotor is arranged. The contemporaneous rotation of the drawing drum around its axis and around the rotor axis allows the strand threads coming from the compacting die to be pulled and stranded at the same time, so that the stranding machine is supplied with a strand which is nearly ready to be stored onto a bobbin. Said known winches have the problem that they must necessarily be provided with mechanical means for moving the strand position on the drawing drum in order to avoid undesired and dangerous overlappings of the turns due to the high tensions and to the high twisting moments to which the strand itself is subjected.
BRIEF SUMMARY OF THE INVENTION
Therefore, object of the present invention is providing a rotating winch which is free from said problem, that is a rotating winch wherein the strand coming from the compacting die chaser can be naturally rolled up around the drawing drum without the help of particular mechanical means and without the risk of overlappings. Said object is obtained by means of a rotating winch whose main features are disclosed in the first claim and other features are disclosed in the following claims.
Thanks to the particular profile and to the containment walls of the external lateral surface of the drawing drum, the strand being inlet into the rotating winch according to the present invention arranges itself around the drawing drum automatically and without overlapping risks. In fact, owing to the traction difference whereto the strand being inlet and outlet from the winch rotor are subjected, the strand undergoes a lengthening which gradually decreases as the traction around the circumference of the drawing drum decreases, according to the known law T=e
k&agr;
, wherein T is the traction, k a friction coefficient and &agr; the angle defined by the strand around the drum. Therefore, external conditions being equal, the strand tends to arrange itself on the decreasing circumferences of the external profile of the new drawing drum, and therefore the turns have the natural tendency to roll towards the center of the profile itself, which has a smaller diameter.
For this purpose, the ratio between the drawing drum diameter near to the containment walls and the diameter at the center of the drawing drum is preferably proportional to the ratio between the tension of the strand being inlet into the rotor and the tension of the strand being outlet from the rotor. Moreover, the profile of the external lateral surface of the drawing drum has preferably a constant radius of curvature, which is about the double of the distance between the containment walls and about ⅔ of the external diameter at the center of the drawing drum.
According to a particular aspect of the present invention, the profile of the external lateral surface of the drawing drum is symmetrical with respect to a central plane perpendicular to the axis of rotation of the drum itself. By this arrangement, it is possible to use the rotating winch with strands laid both clockwise and anticlockwise.


REFERENCES:
patent: 3147581 (1964-09-01), Godderidge
patent: 3981131 (1976-09-01), Hartig et al.
patent: 4328662 (1982-05-01), Bretegnier et al.
patent: 4599853 (1986-07-01), Varga-Papp
patent: 4785617 (1988-11-01), Bourgois et al.

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