Frustoconical device with internal ribs for loom yarn feeders

Details Frustoconical device with internal ribs for loom yarn feeders Frustoconical device with internal ribs for loom yarn feeders

1996-06-24

1998-02-10

Falik, Andy

Textiles: weaving

Weft manipulation

Weaving with stationary weft supply

57 5883, 57354, 242157R, 242128, B65H 5906, D01H 142

Patent

active

057158711

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention concerns a device to control the yarn at the outlet of yarn feeders, particularly an "antiballoon" device containing the weft yarn at the outlet of weft yarn feeders for looms.
More specifically, the invention arose from the need to set up an antiballoon device to be applied at the outlet of measuring weft feeders for fluid jet looms, particularly air looms, so as to stop the forming of balloons--which are quite frequent and create serious inconveniences--as a result of the yarn being unwound in defile from such feeders.
There is known to be an increasingly widespread use of fluid jet looms, particularly air looms, for weaving a constantly rising number of different articles; it is also known that such looms work at increasingly higher speeds.
The higher working speeds determine an increase in the speed of weft yarn insertion and, consequently, a higher yarn unwinding speed from the winding unit of measuring weft feeder. The weft yarn is wound on said winding unit into successive turns, so as to form a yarn reserve, and is subsequently unwound therefrom in defile, which often gives rise--due to high unwinding speed--to the forming of balloons.
The negative consequences of the forming of balloons are substantially the following: feeder which should not be touched in formal unwinding conditions, with possibility for the yarn to get caught in such parts; and determined by the centrifugal forces acting on said yarn.
In practice, this determines irregular conditions in the weft yarn which do not allow it to regularly reach the side of the fabric being woven opposite to that of weft insertion.
Such irregular conditions can substantially occur in two ways: are not constant in respect of the weft insertion cycle; and
2. Description of the Related Art
To overcome these drawbacks--which become more and more evident the higher the loom speed and the smaller the yarn count, due to increase in the centrifugal force action--it is known to use antiballoon devices consisting of hollow elements having an approximately frustoconical shape which, positioned downstream of the measuring weft feeder, perform the function of containing and controlling the balloon formed by the unwinding weft yarn.
FIG. 1 of the accompanying drawings shows an antiballoon device 1 according to known technique, applied just downstream of the measuring weft feeder 2; the weft yarn T--after having been drawn from the spool or reel R, and wound by the winding arm 4 onto the winding unit 3 of the feeder 2--is unwound from said unit 3 thanks to the main nozzle 5 mounted on the loom being fed by said feeder 2.
The antiballoon device 1 is fixed to the upper part of the measuring weft feeder 2 by way of a support bracket 6, which may eventually allow its adjustment in an axial sense so as to suitably vary the distance of the device 1 from the winding unit 3.
Nevertheless, the presence of the device 7 to stop the yarn T--which must forcedly be positioned close the area of the yarn outlet from the winding unit 3--makes it impossible totally envelop said winding unit 3, whereby there is still the possibility of a "residual" balloon (indicated by B in FIG. 1) being formed.
The inner surface of the antiballoon device 1 is moreover apt to create friction forces by rubbing of the weft yarn, hence increasing the tension of the yarn T at its outlet from the device 1, which may cause delays in the times taken for the weft yarn to reach the other side of the fabric being woven, or increases in the feeding pressure of the loom nozzle 5 to make up for the increased yarn resistance to unwinding and thus obtain correct times of weft yarn arrival at the other side of the fabric.
To overcome these drawbacks there are already known to be special configurations of the antiballoon device which tend to reduce friction between the yarn and the wall of said device. By way of example, the following configurations of the antiballoon device are illustrated with reference to FIGS. 2 to 4 of the accompanying

REFERENCES:
patent: 2170194 (1939-08-01), Griggs
patent: 3094835 (1963-06-01), Nimtz et al.
patent: 3199806 (1965-08-01), Jenny
patent: 3203642 (1965-08-01), Hirst
patent: 4471917 (1984-09-01), Whisnant
patent: 5329755 (1994-07-01), Frentzel-beyme et al.
patent: 5605297 (1997-02-01), Bruns

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