Textiles: spinning – twisting – and twining – Apparatus and processes – Receiving twist type
Reexamination Certificate
2000-02-07
2001-06-05
Worrell, Danny (Department: 3741)
Textiles: spinning, twisting, and twining
Apparatus and processes
Receiving twist type
C057S076000
Reexamination Certificate
active
06240715
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a spinning machine and method for producing yarn by centrifugal spinning, also known as pot spinning.
BACKGROUND OF THE INVENTION
A centrifugal or pot spinning machine and method are known for instance from German Patent Disclosures DE 42 08 039 A1 and DE 43 24 039 A1. Such centrifugal spinning machines as a rule include many spinning stations, each of which has one rotatable spinning centrifuge. Such spinning stations are supplied with sliver via a sliver drafting device, preferably a drafting roller mechanism, from which the drafted sliver is spun into a yarn by the action of the spinning centrifuge as it rotates about its center axis. In the process, the yarn passes through a tubular yarn guide and emerges from its orifice, and therefrom the yarn is applied to the inner wall of the spinning centrifuge in layers, forming a so-called spinning cake. This deposition of the spinning cake is accomplished by generating a relative motion, also known as a shogging motion, between the yarn guide and the spinning centrifuge in the axial direction which is generated by a drive device for the yarn guide and/or for the spinning centrifuge. Once the spinning process is completed, or a predetermined amount of yarn is placed in the spinning centrifuge , the yarn cake spun to that time is wound onto a rewinding tube held in readiness on the yarn guide.
From German Patent Disclosure DE 41 02 549 A1, a ring spinning apparatus is known, with a drive device for generating an axial motion between a rotor revolving on a spinning ring and a yarn carrier disposed on a spindle roving frame. The drive device includes a lifting carriage, for instance, which can be shifted by a spindle arrangement. The spindles are driven preferably by an electric motor. In these known drive devices, it is disadvantageous that a relatively complicated arrangement has to be provided, which requires a relatively large amount of space. In addition, the drive spindles are located in an open exposed disposition where they tend to become heavily covered with lint and debris, especially in the environment of a spinning mill, and hence the spindles need a relatively large amount of maintenance.
SUMMARY OF THE INVENTION
It is accordingly an object of the present invention to provide an improved centrifugal spinning apparatus and method which overcomes the aforementioned problems and disadvantages. More particularly, an object of the present invention is to provide a centrifugal spinning apparatus and method with which a relative motion can be attained between a yarn guide and a spinning centrifuge in a simple manner.
According to the invention, this object is attained by a centrifugal spinning machine having at least one spinning station comprising a rotatable spinning centrifuge, a yarn guide arranged to receive a fibrous spinning strand (e.g., a sliver, roving or the like), and a drive device for generating relative motion axially between the yarn guide and the spinning centrifuge for causing the fibrous spinning strand upon emerging from the yarn guide to be spun into a yarn and deposited on an inside wall of the spinning centrifuge in the form of a spinning cake. According to the present invention, the drive device includes a rotor disposed about a rotational axis and the yarn guide is oriented to cause the fibrous spinning strand guided thereby to travel through the rotational axis of the rotor of the drive device.
Because the yarn guided in the yarn guide runs through the rotational axis of the rotor of the drive device, a very compact design is possible. Thus, the provision of intermediate transmission members can be eliminated, which not only saves space but also considerably simplifies assembly.
Because of the reduction of the mass that has to be driven, the energy input for generating a relative motion between the yarn guide and the spinning centrifuge is minimized, which increases the effectiveness of the entire centrifugal spinning device.
In a preferred feature of the invention, the drive device is an electric motor, whose rotor is operatively connected directly to the yarn guide, and preferably the rotor is a cylinder, which receives the yarn guide by positive engagement. As a result, a transmission of the driving energy of the electric motor to the yarn guide is made possible in an especially simple way, since the rotor of the electric motor acts directly on the yarn guide. In particular, this makes a very precise positioning of the yarn guide possible, since tolerance errors, slip errors or the like are avoided because of the lack of intervening transmission members.
An advantageous embodiment is obtained if the rotor of the electric motor has internal teeth that mesh with external teeth of the yarn guide. This arrangement provides a secure, positive connection between the rotor and the yarn guide. The relative motion of the yarn guide with respect to the spinning centrifuge can be adjusted in an exactly replicable manner via the male thread of the yarn guide and the corresponding female thread of the rotor.
It is also a preferred feature of the invention that the electric motor is a stepping motor. As a result, by a suitable defined triggering of the stepping motor, an exact positioning or an exact axial shifting of the yarn guide relative to the spinning centrifuge can be achieved. A proportional shifting of the yarn guide is effected in accordance with the triggering of the stepping motor, so that the spinning cake deposited on the inside circumference of the spinning centrifuge is distinguished by a uniform yarn layer.
The invention also provides a novel and advantageous method of centrifugal spinning yarn. Because the yarn guided in the yarn guide travels through the rotational axis of a rotor of a drive device, and because the yarn guide is acted upon directly by a driving force to produce an axial motion, a very precise relative motion of the yarn guide to the spinning centrifuge can be attained. This direct engagement of the yarn guide by the driving force minimizes any positioning error during the relative motion of the yarn guide. As a result, the quality of the spinning cakes produced can be optimized to a high degree.
Further preferred features, characteristics and advantages of the present invention will be described and understood from a detailed disclosure of an exemplary embodiment of the invention with reference to the accompanying drawings.
REFERENCES:
patent: 3314223 (1967-04-01), Bobkowicz
patent: 5385007 (1995-01-01), Hartel et al.
patent: 5515672 (1996-05-01), Koltze et al.
patent: 323 562 (1957-09-01), None
patent: 41 02 549 A1 (1992-07-01), None
patent: 42 08 039 A1 (1993-09-01), None
patent: 42 36 379 A1 (1994-05-01), None
patent: 43 24 039 A1 (1995-01-01), None
patent: 195 48 675 A1 (1997-06-01), None
patent: 0 498 171 (1992-08-01), None
Bruss Karl-Heinz
Koltze Karl
Sopalae Michael
Kennedy Covington Lobdell & Hickman LLP
W. Schlafhorst AG & Co.
Worrell Danny
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