Method and apparatus for producing intertwined knots in a multifilament thread

Patent metadata

Field	Value
Publication number	US-9422647-B2
Application number	US-201214117825-A
Country	US
Kind code	B2
Filing date	May 7, 2012
Priority date	May 19, 2011
Publication date	Aug 23, 2016
Grant date	Aug 23, 2016

Abstract

A method and an apparatus produces intertwining knots in a multifilament thread. In this case, an air-stream pulse is directed through a nozzle opening transversely onto the thread. In order to produce a continuous succession of intertwining knots, the air-stream pulse is produced periodically with an interval between the air-stream pulses. In order to be able to produce an irregular thread structure, the interval between successive air-stream pulses is continuously changed. To this end, the apparatus has a nozzle ring carrying the nozzle opening, the nozzle ring being coupled to a drive. The drive of the nozzle ring is assigned a control device, by way of which a rotary speed of the nozzle ring is controllable for the purpose of changing an interval between the air-stream pulses.

First claim

The invention claimed is:

1. Method for producing intertwined knots in a multifilament thread, in which the thread is guided with partial wrapping in a thread guide groove at a circumference of a nozzle ring and in which an air flow pulse is directed transversely onto the thread through a nozzle opening, and in which the air flow pulse is generated periodically with a pause time between the air flow pulses so that a continuous sequence of intertwined knots results in the running thread, wherein the pause time between successive air flow pulses for producing intertwined knots is continuously changed.

2. Method according to claim 1 , wherein the pause time between the air flow pulses is changed by a rotational speed of a driven nozzle ring, the nozzle ring bearing the nozzle opening and periodically connecting the nozzle opening to a pressure source by rotation.

3. Method according to claim 1 , wherein the pause time between the air flow pulses is changed by an asymmetrical geometric configuration of multiple nozzle openings formed on a rotating nozzle ring, the nozzle openings being connected one after another to a pressure source by rotating the nozzle ring.

4. Method according to claim 1 , wherein (i) the pause time between the air flow pulses and (ii) the intensity of the air flow pulses are changed in that a rotating nozzle ring has nozzle openings which differ in shape from one another, the nozzle openings being connected one after another to a pressure source by rotating the nozzle ring.

5. Method according to claim 2 , wherein the rotational speed of the nozzle ring is periodically changed between an upper limit speed and a lower limit speed.

6. Method according to claim 5 , wherein the change in the rotational speed of the nozzle ring occurs in a sinusoidal, stepped, or random manner according to a predefined function.

7. Method according to claim 5 , wherein the rotational speed of the nozzle ring is changed at a frequency in the range of 0.5 Hz to 20 Hz and an amplitude the range of ±1% to 10% of a nominal speed of the nozzle ring.

8. Method according to claim 1 , wherein one of (i) the pause time between the air flow pulses and (ii) the intensity of the air flow pulses is changed in that a rotating nozzle ring has nozzle openings which differ in shape from one another, the nozzle openings being connected one after another to a pressure source by rotating the nozzle ring.

9. Apparatus for producing intertwined knots in a multifilament thread,
having a rotating nozzle ring which has a circumferential guide groove for guiding the thread with partial wrapping and at least one nozzle opening which opens radially into the guide groove,
having a stationary pressure chamber which is connectable to a compressed air source via a compressed air connection,
having a chamber opening which is connectable to the nozzle opening of the nozzle ring, wherein the nozzle opening for producing an air flow pulse is connectable to the chamber opening by rotating the nozzle ring, and
having a drive which is coupled to the nozzle ring,
wherein a control device by means of which a rotational speed of the nozzle ring is controllable for the purpose of changing a pause time (t P ) between the air flow pulses is interacting with the drive of the nozzle ring.

10. Apparatus according to claim 9 , wherein the nozzle ring has multiple nozzle openings arranged in a distribution at the circumference of the nozzle ring, and wherein the nozzle openings differ in shape from one another.

11. Apparatus according to claim 9 , wherein the control device has a control program by means of which the rotational speed of the nozzle ring is periodically changeable between a lower limit speed and an upper limit speed.

12. Apparatus according to claim 9 , wherein a movable cover is associated with the nozzle ring in a contact area between the guide groove and a thread, by means of which a treatment channel for accommodating the air flow pulses is formed.

13. Apparatus according to claim 9 , wherein the nozzle ring has a ring-shaped design with an inner sliding surface into which the nozzle opening opens radially, wherein the pressure chamber is provided at a stator having a cylindrical sealing surface into which the chamber opening opens, and wherein the sliding surface of the nozzle ring cooperates with the sealing surface of the stator for transmitting compressed air.

14. Apparatus according to claim 9 , wherein the nozzle ring has a disk-shaped design with a sliding surface on an end-face side of the nozzle ring, wherein the nozzle openings open axially into the end-face side of the nozzle ring, wherein the pressure chamber is provided at a stator which has a flat sealing surface into which the chamber opening opens, and wherein the sliding surface of the nozzle ring cooperates with the sealing surface of the stator for transmitting compressed air.

15. Apparatus for producing intertwined knots in a multifilament thread,
having a rotating nozzle ring which has a circumferential guide groove for guiding the thread with partial wrapping and at least one nozzle opening which opens radially into the guide groove,
having a stationary pressure chamber which is connectable to a compressed air source via a compressed air connection, and
having a chamber opening which is connectable to the nozzle opening of the nozzle ring, wherein the nozzle opening for producing an air flow pulse is connectable to the chamber opening by rotating the nozzle ring,
wherein the nozzle ring has multiple nozzle openings arranged in a distribution at the circumference of the nozzle ring, and wherein the nozzle openings are distributed in an asymmetrical geometric configuration at the circumference of the nozzle ring in such a way that separation angles (φ) between respective adjacent nozzle openings are of unequal size.

16. Apparatus according to claim 15 , wherein the nozzle ring has multiple nozzle openings arranged in a distribution at the circumference of the nozzle ring, and wherein the nozzle openings differ in shape from one another.

17. Apparatus according to claim 15 , further comprising:
a control device has a control program by means of which the rotational speed of the nozzle ring is periodically changeable between a lower limit speed and an upper limit speed.

18. Apparatus according to claim 15 , wherein a movable cover is associated with the nozzle ring in a contact area between the guide groove and a thread, by means of which a treatment channel for accommodating the air flow pulses is formed.

19. Apparatus according to claim 15 , wherein the nozzle ring has a ring-shaped design with an inner sliding surface into which the nozzle opening opens radially, wherein the pressure chamber is provided at a stator having a cylindrical sealing surface into which the chamber opening opens, and wherein the sliding surface of the nozzle ring cooperates with the sealing surface of the stator for transmitting compressed air.

20. Apparatus according to claim 15 , wherein the nozzle ring has a disk-shaped design with a sliding surface on an end-face side of the nozzle ring, wherein the nozzle openings open axially into the end-face side of the nozzle ring, wherein the pressure chamber is provided at a stator which has a flat sealing surface into which the chamber opening opens, and wherein the sliding surface of the nozzle ring cooperates with the sealing surface of the stator for transmitting compressed air.

Assignees

• Matthies Claus
• Stundl Mathias
• Oerlikon Textile Gmbh & Co Kg

Inventors

• Matthies Claus
• Stundl Mathias

Classifications

• D02J1/06

  Imparting irregularity, e.g. slubbing or other non-uniform features, e.g. high- and low-shrinkage or strengthened and weakened sections · CPC title

• D02J1/08

  Interlacing constituent filaments without breakage thereof, e.g. by use of turbulent air streams · CPC title

• D02G1/162 Primary

  with provision for imparting irregular effects to the yarn · CPC title

• D02G1/167 Primary

  including means for monitoring or controlling yarn processing · CPC title