Textiles: spinning – twisting – and twining – Apparatus and processes – Alternate twist
Reexamination Certificate
1999-02-08
2001-05-08
Calvert, John J. (Department: 3765)
Textiles: spinning, twisting, and twining
Apparatus and processes
Alternate twist
C057S344000, C242S615100
Reexamination Certificate
active
06226972
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention covers the method and equipment in manufacturing Alternate Twisted Yarns whose twisting direction differs alternately in the yarn's longitudinal direction (the S twist area and Z twist area exist alternately).
Since irregular crimping can be produced by post-processing by such an Alternate Twisted Yarn, it is possible to manufacture the seersucker texture and wrinkled texture easily.
As a means for manufacturing this Alternate Twisted Yarn, this inventor has already suggested this method in the Official Gazette of Patent OPI Pub. 1996-246280. In this suggestion, a raw yarn is drawn out continuously or intermittently from the supply bobbin (which is fixed) and the raw yarn thus drawn out is inserted and passed to the twisting equipment rotating intermittently in one direction for intermittent twisting, which is then to be heat set after it is wound on to the take-up bobbin. The twisting equipment illustrated is such that the roller provided with a V-groove for rolling the yarn in the rotating cylindrical body's internal center is inserted at right angles to the shaft, and a nipper is provided to hold the yarn, utilizing centrifugal force. In any case, the yarn is to be twisted by means of the cylindrical body's rotation when passing through the said cylindrical body, and the twisting applied to the yarn is exactly opposite from the approach side to the delivery side on the twisting equipment.
In this case, the total number of twists generated on the twisting equipment's approach side and the delivery side is the same. However, since the yarn is wound on to the take up bobbin even during the twisting equipment's intermittent rotation stop period, the yarn twist on the twisting equipment's approach-side is sent to the delivery side through the twisting equipment, thereby untwisting the yarn on the delivery side, so that the twist is eliminated if this state were to continue. In reality, since the yarn on the delivery side cannot be untwisted because it is wound on to the take-up bobbin, the number of twists remaining on the delivery-side yarn becomes fewer than the total number of twists on the approach side. Extra twist sent to the delivery side from the approach side is wound on to the take-up bobbin as opposite twist in relation to the previous twist (i.e. S twist then next Z twist). Next, the twisting equipment restarts its intermittent rotation, newly twisting the yarns on the approach side and the delivery side in the reverse direction on the delivery side. The remaining yarn is untwisted just as it was in the earlier stages which is followed by new twisting, and then the rotation stops so that the aforementioned phenomenon occurs once again. Hence, the repeated rotation and stopping phenomenon described above continually repeats, thus producing the Alternate Twisted Yarn.
However, the above suggested equipment had a problem in that the cylindrical body which functions as a twisting device is rotated by a positive drive device in the yarn twisting direction. The rotation and stop must be repeatedly and alternately controlled, which in turn makes the twisting equipment's structure complicated, and the equipment cost, operating expenses, maintenance and control costs or the like are expensive.
SUMMARY OF THE INVENTION
The inventor proposes this invention with the above-mentioned problems taken into account. The aim of this invention is to provide the method and equipment for manufacturing Alternate Twisted Yarn in which both are simple and inexpensive.
In order to achieve the aforementioned purpose, this invention was made to manufacture Alternate Twisted Yarn by alternately repeating the operations of twisting yarn in the opposite direction on both sides of the pulley by intermittently bringing the yarn into contact with the pulley flange's internal surface by which such contact drives the pulley itself with the yarn passage inserted between the pulley flanges so that the yarn is flexed or bent around the pulley with the shaft of this pulley inclined in relation to the yarn travelling plane in order to twist the yarn in the opposite direction on both sides of the pulley. In order to drive the yarn in the neutral state in which no yarn is twisted on both sides of the pulley, the contact to the pulley flange's internal surface is cut off by shifting the pulley shaft so that it is made perpendicular to the yarn passage plane.
In other words, if the yarn is inserted between the pulley flanges so that its passage is bent or flexed, the grooved bottom of the pulley coming into contact with this yarn is thus driven with frictional force by means of the yarn travelling due to the yarn winding on to the take up package.
Further, if the pulley shaft is inclined in relation to the yarn passage plane, the yarn approaching the pulley comes into contact with one (for example, the upper side) flange's internal surface inside the pulley groove, while the yarn sent out of the pulley contacts the other (for example, the lower side) flange's internal surface.
In this case, since the grooved bottom section is rotated with frictional force by the travelling yarn in the pulley, and the rotation direction in the pulley flange section is nearly perpendicular to the yarn passage direction, the yarn contacting this rotating pulley flange's interior will be twisted because of this contact on the inside surface of the pulley flange.
Further, since the yarn on the approach side is contacting the inside of one side of the pulley's two flanges and the yarn is contacting the inside of the opposite side of the pulley's two flanges on the delivery side, the twist applied to the yarn becomes reversed on the pulley's approach side in relation to the pulley's delivery side, i.e., S twist on the approach side of the pulley and Z twist on the delivery side of the pulley.
On the other hand, if the pulley shaft is made perpendicular to the yarn passage plane, the yarn will be placed in the neutral condition in which it does not contact either side of the pulley's flanged interior surface. Therefore, as the yarn travels, it only contacts the grooved bottom of the pulley. Accordingly, no yarn is twisted. Since the yarn continues to travel, the twist applied to the yarn at the pulley's approach side passes through the pulley, which is then sent out to the delivery side. Thus, it follows that the same phenomenon occurs as explained in the Conventional Technology paragraph described above, and if this process is repeated, Alternate Twisted Yarn will be produced.
In this way, according to this invention, the method for rotating and driving the twisting equipment by a positive drive device, which is required by the conventional technology, is not required. That is, in this invention, an Alternate Twisted Yarn can be manufactured by only repeating the operations of inclining the pulley shaft and returning it to the neutral position.
In this invention, the pulleys comprise several front-stage pulleys arranged in parallel and one rear stage pulley; the yarn passage of several yarns travelling in parallel are inserted between the pulley flanges on several front stage pulleys (one yarn end per front stage pulley) where the yarn passage is bent or flexed. Next, the several yarns are assembled and passed through an eyelet and are inserted between the flanges of the rear stage pulley with the yarn passage bent or flexed. The shafts of each front stage pulley and rear stage pulley are tilted in any mode by means of computer control in order to manufacture a variety of Alternate Twisted Yarn. The varieties of Alternate Twisted Yarn are produced by the different combinations of tilting modes among the mutual front stage pulleys and the combinations of tilting modes by the rear stage pulley. These tilting mode combinations can be obtained simply and easily by a computer software changeover or the like.
Further, this invention was made to manufacture a variety of Alternate Twisted Yarns by inclining the
Calvert John J.
Izumi International, Inc.
Leatherwood Walker Todd & Mann, P.C.
Welch Gary L.
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