Textiles: spinning – twisting – and twining – Apparatus and processes – Strand guiding or guarding
Reexamination Certificate
1998-08-28
2001-02-06
Stryjewski, William (Department: 3741)
Textiles: spinning, twisting, and twining
Apparatus and processes
Strand guiding or guarding
C057S066000, C057S072000, C057S074000, C057S127000, C057S355000
Reexamination Certificate
active
06182434
ABSTRACT:
TECHNICAL DOMAIN
The invention relates to a spindle spinning or spindle twisting process that is carried out on a spinning system with a feed device for the fiber formation, with a driven spindle for the tube and with a balloon limiter arranged parallel with the spindle, also driven and having on its inner side a work surface for contact with the yarn, and a spinning system for execution of the process.
STATE OF THE ART
From U.S. Pat. No. 2,833,111 and in particular EP 0 496 114 A1 a spinning system is known in which a balloon limiter driven in the direction of the spindle's rotation serves as a support for the ring with the urchin or for another, equivalent means for carrying out a yarn force control before the yarn is coiled onto the tube.
The production speeds of such a spinning system are limited by a physical barrier that consists in that at extreme production speeds of spindles, the mass of the urchin or of another equivalent means causes a high degree of tensile stress that negatively influences the course of the spinning process as well as the practical characteristics of the yarn spun out. During operation there occurs at the same time a considerable urchin wear due to the contact with the fast running, extremely taught yarn. For this reason, it is necessary for the urchin to have been made of a very abrasion-resistant material and at the same time to be non-deformable for the purpose of overcoming the centrifugal forces in the yarn. These two conditions can only be fulfilled by using materials with greater density, resulting on the other hand in their greater specific mass. As was already mentioned, the urchin mass causes an undesired increase of stress in the yarn spun out, at constant rotational speeds of the balloon limiter rotating together with the urchin.
In another known spinning system of the type cited above (GB 2,088,907 A) the balloon limiter is formed by an actuated bell. In this case the yarn coming from a drafting arrangement runs inside the bell up to its lower edge. At this lower edge the yarn goes through a guide opening and is then coiled over this lower edge onto a tube. Thus, the yarn force control before the yarn is coiled onto the tube is carried out in this case by means of a lower bell edge. But because the yarn first runs through the guide opening from the inside of the bell out and then over the lower bell edge back against the tube, a large yarn loop is created between the yarn and the bell; this loop produces a considerable frictional resistance in such a way that it is neither possible to spin out several types of yarn nor to increase production speed.
DISCLOSURE OF THE INVENTION
The invention is based on the technical problem of creating a process of the type mentioned above and a spinning system for execution of the process, which reliably alleviates or eliminates all disadvantages stemming from the use of the known yarn force control before the yarn is coiled onto the tube and thereby makes possible the production of a high-quality ring spun or ring twisted yarn even at extremely high production speeds.
In so doing, the present invention features a process and a system in that the yarn entrained by the work surface of the balloon limiter goes directly from this work surface onto the tube as a rotating, open loop which stretches due to the action of the centrifugal force, in connection with which its reverse bending has a greater radial distance from the rotational axis of the spindle than that point on the work surface of the balloon limiter from which the yarn stretches into the rotating, open loop. In this process, a so-called yarn force control before yarn coiling onto the tube is carried out with the same yarn, namely by means of the rotating, open loop. In this case the advantage lies in the fact that no frictional resistances are caused that would limit the yarn in its faster movement to the tube, in such a way that the yarn coiling speed, that is, the spindle rotational speed, can be increased accordingly.
In a further design of the invention it is provided for that the rotating, open loop is radially limited during operation. Through radial limitations, the size of the rotating, open loop, that is, the distance of its reverse bending from the rotational axis of the spindle can be reduced, in such a way that the production of a quality yarn becomes possible even with relatively small space requirements.
In a further design of the invention it is provided for that the yarn forming the rotating, open loop is braked before coiling onto the tube; above all, this makes it possible to choose not only the different rotational speeds, but also corresponding rotational speeds of the spindle and the balloon limiter.
The spinning system for execution of the process contains a feed device for the fiber formation, a driven spindle for the tube and a balloon limiter arranged parallel with the spindle, also driven and having on its inner side a work surface for contact with the yarn.
According to the invention, in such a spinning system it is provided for that a peripheral stop for the transition of the yarn from this work surface directly onto the tube is arranged on the work surface, in connection with which the yarn is formed by the action of the centrifugal force in the form of a rotating, open loop, whereby any desired point on the work surface which is situated at a greater distance from the entry end of the balloon limiter than the cited peripheral stop is arranged at the greater radial distance from the rotational axis than this peripheral stop. This spinning system operates according to the process according to the invention, in connection with which all earlier limitations in the domain of so-called yarn force control before the yarn is coiled onto the tube are dispensed with. In this way, it becomes possible to produce various types of yarn that are at least as good as the so-called ring spun yarn and, in so doing, to achieve high production speeds.
The self-regulating spindle or twisting system according to the invention makes it possible to manufacture the high-quality ring spun yarn or high-quality twists at extremely high production speed. Useful designs and further developments of the object of the invention are indicated in the subclaims.
REFERENCES:
patent: 2833111 (1958-05-01), Hadlich
patent: 4592196 (1986-06-01), Wolf
patent: 4779409 (1988-10-01), Marchiori et al.
patent: 4862287 (1989-08-01), Marchiori et al.
patent: 4959953 (1990-10-01), Krawietz
patent: 5109659 (1992-05-01), Tsuzuki
patent: 5590515 (1997-01-01), Boden
patent: 3140422 (1983-04-01), None
patent: 3400327 (1985-07-01), None
patent: 4103369 (1991-09-01), None
patent: 4033951 (1992-04-01), None
patent: 306691 (1989-03-01), None
patent: 485880 (1991-11-01), None
patent: 0496114A (1992-07-01), None
patent: 2088907A (1982-06-01), None
Bla{haeck over (z)}ek Petr
Didek Stanislav
Kubový Václav
Smith , Gambrell & Russell, LLP
Stryjewski William
Vyzkumny Ustav Bavlnarsky A.S.
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