Yarn storage and feed device with axially adjustable yarn stoppi

Details Yarn storage and feed device with axially adjustable yarn stoppi Yarn storage and feed device with axially adjustable yarn stoppi

1991-06-03

1992-12-15

Falik, Andrew M.

Textiles: weaving

Weft manipulation

Weaving with stationary weft supply

D03D 4736

Patent

active

051708221

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention refers to a yarn storage and feed device.
2. Description of Prior Art
In the case of known yarn storage and feed devices, the stopping element is arranged at a comparatively large axial distance from the last winding of the yarn supply close to the head of the storage member. The position of the stopping element is chosen with due regard to the fact that all imaginable yarn qualities are to be processed by the yarn storage and feed device and that, when using the same length in the yarn supply for essentially all the yarn qualities, a substantial axial distance between the last winding in the yarn supply and the stopping element and a comparatively large angle between the last winding in the yarn supply and the yarn section moving from the last yarn winding to the stopping element still exist even in the case of the coarsest yarn. Especially when multicolor weaving is performed on a jet weaving machine, a group of such yarn storage and feed devices is provided, only one of said devices being in operation, whereas the others are at rest. However, the yarns of the yarn storage and feed devices which are at rest always extend up to and into the main nozzle of the weaving machine where they are permanently acted upon by a pressure medium flow and thus kept at hand for the next insertion process. In view of the fact that the main nozzle and the reed oscillate and the yarn is acted upon by the standby pulling force, at least the last winding will be axially opened in a manner comparable to a helical spring having a pulling force applied thereto, this being due to the large angle between the last winding and the yarn section extending towards the stopping element. This will cause an increase in the length of the yarn downstream of the stopping element so that the free end of the yarn moves out of the main nozzle. The cutting device, which is associated with the main nozzle and provided for all yarns and which is periodically actuated for the color which is just being processed, cuts off this increase in length. The resultant yarn pieces will not only cause uncontrollable interfering effects in this critical operating area but they will also penetrate into the woven fabric and deteriorate its quality.
It is true that, in the case of a yarn storage and feed device comprising several stopping elements which are distributed around the circumference of the storage member in spaced relationship with one another (EP 264985), it is known to axially displace the stopping elements during the yarn withdrawl and insertion process so as to be able to determine--in spite of the spaces between the individual stopping elements--precisely, without any discontinuity, the length of yarn to be inserted. This principle, however, does not take into account the processes taking place in the yarn supply in the period of rest and it cannot provide any suggestions with regard to the solution of the problem described at the beginning.
FIG. 1 and 2 disclose a yarn storage and feed device 1' having a known structural design, in the case of which components which are of secondary importance in understanding the function have been omitted. Such yarn storage and feed devices 1' are often used for multicolor weaving on jet weaving machines W so as to supply to the jet weaving machine W weft yarn sections of a precise length, said weft yarn sections being drawn off a supply bobbin (not shown) as a continuous yarn F. The exact dimensioning of every weft yarn section is effected with the aid of a means, which is not shown and which is incorporated into the yarn storage and feed device 1', said means including either, in the case of a cylindrical storage member 2 having an adjustable outer diameter, a single stopping element 13, which interrupts the yarn take-off process when a predetermined yarn length has been reached, or, in the case of a storage member having a fixed outer diameter, several stopping elements 13, which are distributed over the circumference of said stora

REFERENCES:
patent: 4529017 (1985-07-01), Suzuki et al.
patent: 4792101 (1988-12-01), Van Bogaert et al.
patent: 4949763 (1990-08-01), Maina

Affiliated with

Also associated with

Rating

Yarn storage and feed device with axially adjustable yarn stoppi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Yarn storage and feed device with axially adjustable yarn stoppi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Yarn storage and feed device with axially adjustable yarn stoppi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2086578