Textiles: spinning – twisting – and twining – Apparatus and processes – Receiving twist type
Reexamination Certificate
1999-11-24
2001-06-12
Calvert, John J. (Department: 3741)
Textiles: spinning, twisting, and twining
Apparatus and processes
Receiving twist type
C057S067000, C057S071000, C057S267000, C057S312000, C242S911000
Reexamination Certificate
active
06244029
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method for winding a body or cake of a spun yarn formed in a spinning centrifuge of a pot spinning machine onto a tube. The present invention also relates to a device for implementing the method of the present invention.
BACKGROUND OF THE INVENTION
In pot spinning, the yarn, deposited in the spinning centrifuge or the spinning pot as spinning cake, is wound after the end of the actual spinning process onto a previously introduced tube so that a spinning cop is produced. An empty tube is used for this which is held ready on the yarn guide tube during the actual spinning process and is lowered past the mouth of the yarn guide tube for initiating the winding process of the yarn body deposited on the inner wall of the spinning centrifuge.
The tube edge catches the rotating yarn shank exiting out of the yarn guide tube thereby, for example in a slot arranged on the lower edge of the tube, and prevents this shank from rotating further in this manner with the consequence that the yarn body deposited on the inner wall of the spinning centrifuge and rotating further with it loops around the tube and is rewound therewith onto the empty tube.
Due to lacking further rotation, the yarn separates from the draw frame when the draw frame supplies more material or is cut off, as is disclosed in German Patent Publication DE 43 24 039 A1, by a clamping and cutting device directly in the direction of yarn travel behind the draw frame. However, the yarn remains fastened on the tube, forms a trailing yarn or remnant of spinning yarn and can have a disturbing influence with its free end, which can be, for example half a meter long, at the spinning position or during the further handling of the tube or of the spinning cop.
SUMMARY OF THE INVENTION
It is accordingly an object of the present invention to solve the problem of how to eliminate the aforementioned sources of disturbance in a pot spinning machine.
The present invention solves this problem by providing a novel method and a device for winding a body of a spun yarn from an inner wall of a spinning centrifuge of a pot spinning machine onto a winding tube surrounding a yarn guide tube. The winding tube has a slot at its foot and the yarn guide tube has a leading end extending into the spinning centrifuge with a mouth from which the spun yarn travels to the inner wall of the centrifuge.
In accordance with the present invention, the foot of the winding tube is inserted into the spinning centrifuge beyond the mouth of the yarn guide tube. In such disposition, a rotating extent of the spun yarn between the mouth of the yarn guide tube and the inner wall of the spinning centrifuge is caught by the slot at the foot of the winding tube causing the spun yarn to wind onto the winding tube as the spinning centrifuge rotates and causing a remnant extent of the spun yarn trailing the rotating yarn extent to be separated from the spun yarn body for subsequent removal, preferably by a suction device.
In a preferred embodiment of the present invention, separation of the remnant of spinning yarn occurs by cutting. Separation may also occur when the rotating yarn extent is held and tensioned, for example, between rollers of a preceding draw frame and the rotating extent of the yarn caught by the winding tube. Furthermore, according to another preferred embodiment of the present invention, separation may also occur as a result of a separating device which can be regulated by means of relative motion between the winding tube and the yarn guide tube. For example, separation may be accomplished by means of rotary motion of a separating device about an axis of rotation coinciding with a common longitudinal axis of the winding tube and the yarn guide tube. Other advantageous embodiments of the method and the device of the present invention are set forth in more detail herein.
The separation close to the location at which the yarn was grasped by the tube foot, causes the free end of the spinning yarn remaining on the tube foot to be so short that no more adverse influence or disturbance of the functions of the pot spinning machine can emanate from it and from the separated section of spinning yarn completely removed by suction.
As a result of the fact that the separation preferably takes place as a cutting process, a purposeful, clean and reliable separation is possible. The yarn does not tear haphazardly, e.g., at a thin spot, leaving a yarn remnant or free end which continues to disturb. The separation preferably takes place, when the yarn is held and tensioned on one end by the draw-frame rollers and on the other end by the yarn body or the tube, as is the case in the time period between the start of the winding process and the loosening of the yarn from the draw frame. The separation is possible therewith without additional clamping devices. The yarn is sufficiently fixed and tensioned at both ends at the time of the cutting process.
A separating device which can be controlled with advantage by means of the relative motion between the tube and the yarn guide tube and designed as part of a yarn guide assures that the separation of the remnant of the spinning yarn automatically takes place at the start of winding, that is, at the creation of the remnant of the spinning yarn. An additional control can be eliminated. A placing of the remnant of spinning yarn on the spinning centrifuge is excluded by the separation at the start of winding.
The separation takes place in a preferred manner by the rotational motion of a separating device whose axis of rotation is on the imaginary center line forming the common longitudinal axis of the tube and the yarn guide tube. This permits an especially, functionally reliable and purposeful separation directly at the tube slot. The preferable removal by suction by the removal of slubbing by suction represents a simple and effective possibility of removal by suction by the utilization of the suction removal present in the spinning position.
In a further advantageous embodiment of the method of the present invention, the remnant of spinning yarn is separated after the arrival of a traveling doffer at the spinning position by means of a separating device entrained by the traveling doffer and the removal of the remnant of spinning yarn takes place by means of the suction of the traveling doffer. The separation and the removal by suction of the remnant of spinning yarn as a function of the traveling doffer can be carried out with little expense therewith.
In a preferred embodiment, each spinning position comprises a separating device for separating the remnant of spinning yarn from the yarn body and comprises a suction removal device for removing the remnant of spinning yarn separated in this manner. It is possible therewith to eliminate the remnant of spinning yarn immediately at the start of winding and when it is created.
In order to avoid additional suction removal devices and to keep the construction cost low at the spinning position, the removal of slubbing by suction of the pot spinning machine is also designed with preference as a suction removal device for the remnant of spinning yarn.
In further embodiments, the separating device preferably comprises at least one knife which can move in the axial direction of the tube and preferably at least one knife which can rotate about an axis of rotation, which axis of rotation lies on the imaginary center line forming the common longitudinal axis of the tube and of the yarn guide tube. The knife is advantageously designed in the form of a crown. The remnant of spinning yarn can be separated in an especially reliable and purposeful manner with such designs of the separation device of the present invention without the disadvantages of the prior art. This makes possible simple and space-saving constructive solutions such as the arrangement of the separating device inside the tube which does not disturb or hinder the other functions of the pot spinning machine.
The device for pot spinning comprises means for converting the axial relativ
Bruss Karl-Heinz
Klinkenberg Karl-Heinz
Koltze Karl
Schult Udo
Calvert John J.
Hurley Shaun R
Kennedy Covington Lobdell & Hickman LLP
W. Schlafhorst AG & Co.
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