Title of Invention	METHOD FOR OPERATING AN OPEN-END SPINNING DEVICE
Abstract	The invention relates to a method for operating an open-end spinning device (1), comprising a spinning rotor (2) and an opening roller (12), which can be controlled so as to be driven individually independently of one another, wherein after an interruption in the spinning process takes place as a result of the detection of the absence of a thread, a piecing operation is initiated, comprising a piecing process, in which an upper thread passes through a fiber ring formed in the spinning rotor (2) and is connected to the latter, and a subsequent drawing-in accumulating process which serves to reduce a thin point in the thread following the piecer, wherein during the piecing operation, the opening roller (12) is temporarily driven at a piecing speed which is higher than the operating speed of the opening roller (12).

Title of Invention

METHOD FOR OPERATING AN OPEN-END SPINNING DEVICE

Abstract

The invention relates to a method for operating an open-end spinning device (1), comprising a spinning rotor (2) and an opening roller (12), which can be controlled so as to be driven individually independently of one another, wherein after an interruption in the spinning process takes place as a result of the detection of the absence of a thread, a piecing operation is initiated, comprising a piecing process, in which an upper thread passes through a fiber ring formed in the spinning rotor (2) and is connected to the latter, and a subsequent drawing-in accumulating process which serves to reduce a thin point in the thread following the piecer, wherein during the piecing operation, the opening roller (12) is temporarily driven at a piecing speed which is higher than the operating speed of the opening roller (12).

Full Text	FORM 2 THE PATENT ACT 1970 (39 of 1970) & The Patents Rules, 2003 COMPLETE SPECIFICATION (See Section 10, and rule 13) 1. TITLE OF INVENTION METHOD FOR OPERATING AN OPEN- END SPINNING DEVICE 2. APPLICANT(S) a) Name b) Nationality c) Address OERLIKON TEXTILE GMBH & CO. KG GERMAN Company LANDGRAFENSTRASSE-45, D-41069 MOENCHENGLADBACH, GERMANY 3. PREAMBLE TO THE DESCRIPTION The following specification particularly describes the invention and the manner in which it is to be performed:- ENGLISH TRANSLATION VARIFICATION CERTIFICATE u/r. 20(3)(b) I, Mr. HIRAL CHANDRAKANT JOSHI, an authorized agent for the applicant, OERLIKON TEXTILE GMBH & CO. KG do hereby verify that the content of English translated complete specification filed in pursuance of PCT International application No. PCT/EP2006/ 004711 thereof is correct and complete. The present invention relates to a method for operating an open end spinning device according to the preamble of claim 1. With increasing requirements of the yarn production process, higher and higher demands are also being made on the production of piecers. The process for forming piecers after thread interruptions, the piecing, is generally carried out at the individual spinning stations of the open end rotor spinning machines by a piecing mechanism travelling along the spinning machine, the so-called piecing carriage. After a thread break, for example, which triggers the piecing, it takes different lengths of time as a function of the position of the piecing carriage at the open end rotor spinning machine until spinning can start again at the relevant spinning station. During the thread break, the drawing in of the fibre is switched off, but the opening roller, which continues to run, still releases fibres at this time from the tuft. In order to achieve the same conditions during piecing and therefore as far as possible the same prefeed quantity of fibres, the tuft is levelled before each piecing. The actual process of piecing begins with the start of the spinning rotor. In the time after the tuft levelling of the fibre band presented until the drawing in for the operational fibre feed is switched on, fibres are in turn combed out from the tuft of the fibre band and sucked off via the rotor edge of the stationary spinning rotor. In addition to the after-running of the fibre flow after switching off the drawing in and the delayed start-up after switching on the drawing in, the fibre flow may also react with a delay on increasing the drawing in speed. This can lead to the thread becoming too thin during the run-up of the spinning rotor. This occurs to a particularly marked extent at low drawing in speeds. To avoid this undesired thickness deviation, a drawing in accumulation process can be carried out. Drawing in accumulation processes of this type during piecing are described in detail, for example, in DE 40 30 100 Al or in the publication by Raasch et al "Automatisches Anspinnen beim OE-Rotorspinnen", Melliand Textilberichte 4/1989, pages 251 to 256. A single motor-driven opening roller for an open end spinning device is known from DE 103 38 842 Al. The opening roller known from this document is used on the open end spinning device in the manner already described in the prior art mentioned above. It has proven to be disadvantageous that the delay described at the outset also occurs here when providing the required fibre quantity for piecing that is necessary for the drawing in accumulation. However, it is important for the quality of the piecers that the fibre supply takes place in a reproducible manner and without a delay. It is therefore the object of the present invention to provide a method, by means of which the uniformity of the yarn during the spinning process is improved. This object is achieved according to the invention by the characterising features of claim 1. Advantageous configurations of the invention are the subject of the sub-claims. According to claim 1 it is provided that, during the piecing process, the opening roller is driven at a piecing speed, which is above the operating speed of the opening roller. After the process of tuft levelling, which is used to create the same conditions during piecing, always displaced by the same time span with respect to this process, a quantity of fibre band is drawn in so as to provide substantially the same fibre quantity at the beginning of the piecing process. The higher piecing speed compared to the operating speed of the opening roller brings about a higher fibre throughput, so after the build up of the fibre ring during the piecing process in the spinning rotor a fibre quantity is provided for piecing such that after the working off of the fibre ring, no lack of fibre due to a delay occurs causing a thin point. The higher piecing speed of the opening roller moreover achieves a more effective combing out of the fibres, which additionally leads to an improvement in the piecing behaviour. The piecing speed of the opening roller should preferably be reached before the beginning of the piecing process. The reproducibility of the fibre supply required for the quality of the piecers is thus achieved. Since the fibres are constantly combed out at the same piecing speed of the opening roller, the same fibre quantity is constantly supplied to the spinning rotor during piecing. In particular, the piecing speed of the opening roller can be maintained during the complete working off of the drawing in accumulation. In this manner, the increased fibre throughput is also kept constant beyond the conclusion of the actual piecing up process so as to avoid, as desired, a thin point adjoining the piecer. Following the drawing in accumulation process, the spinning speed of the opening roller is reduced to the operating speed adapted to the normal spinning operation. This is used to ensure the yarn uniformity of the thread to be spun. The open end spinning device can thus be operated according to the invention at an opening roller speed optimally adapted to these processes both for the piecing process and for the spinning operation. The speed control of the opening roller during the piecing process and the process of the drawing in accumulation can advantageously take place independently of other parameters influencing these processes by means of a control mechanism. This is achieved by the use of single motor drives, for example for the spinning rotor and the opening roller, which are in each case connected via signal lines to the control mechanism and are controlled by the latter independently of one another. The invention will be described in more detail below with the aid of an embodiment shown in the drawings, in which: Fig. 1 shows an open end rotor spinning device with single motor drives at least for the spinning rotor, opening roller and a control mechanism for these drives; Fig. 2 shows the profile of a piecer at a piecing speed of the opening roller of 5,500 revolutions per minute; Fig. 3 shows the profile of a piecer at a piecing speed of the opening roller of 10,000 revolutions per minute. The view in Fig. 1 shows an open end spinning device 1 of an open end rotor spinning machine, which is arranged in the region of the spinning stations of textile machines of this type. Open end spinning devices 1 of this type are known in principle and described in relative detail, for example, in DE196 50 597 Al. The open end spinning device 1 comprises a spinning rotor 2 with a rotor cup 4, which revolves during spinning operation at a high speed in a spinning rotor housing 5 which is acted on by a reduced pressure. The rotor housing 5, which is closed at the front by a cover element 8 during spinning operation, is connected for this purpose via a pneumatic line 6 to a reduced pressure source 7, which provides the reduced pressure in the rotor housing 5 necessary for spinning. The spinning rotor 2 can be driven in a defined manner by a controllable electric motor single drive 3, which is connected via electric lines 20 to the energy supply 23 of the relevant textile machine. The electric motor single drive 3 is connected for this purpose to a control mechanism 21 via at least one signal line 22. The cover element 8, which closes the rotor housing 5 during the spinning operation, is mounted so as to be rotatable to a limited extent about a pivot pin 16, so the stationary spinning rotor 4 is accessible if necessary. A so-called channel plate adapter 9 is also let into the cover element 8, so as to be replaceable, at the level of the spinning rotor 2 and is adjoined by a thread draw-off tube 10. Furthermore, the cover element 8 has an opening roller housing 11, in which an opening roller 12 rotates and is fixed by its bearing shaft 17 in a rear bearing bracket 14 of the opening roller housing 11. The opening roller 12 is driven by an electric motor single drive 24, which is configured as an external rotor, and for easy detachable coupling to the energy supply 23 of the open end rotor spinning machine has a contact track mechanism 18 at the end region of its bearing shaft 17. The electric motor single drive 24 is also connected via a signal line to the control mechanism 21 and can be controlled thereby. A fibre band draw-in cylinder 13 is also rotatably mounted in the opening roller 11 and can be acted upon by an electric motor by means of a drive 15, a stepping motor. The drive 15 is also connected by an electric line 26 to the energy supply 23 of the textile machine and by a signal line 25 to the control mechanism 21. Once an interruption of the spinning process has occurred because of the detection of the absence of a thread by means of a thread monitoring device, not shown, the spinning device 1 is firstly shut down. A piecing process for thread connection is then initiated. The piecing process begins with the tuft levelling to provide the same preconditions for the piecing process, regardless of how long the shut down of the spinning device 1 lasts. Following the tuft levelling, the spinning rotor 2, which has a speed of about 120,000 min-1 or more during spinning operation, is initially run up in such a way that the spinning rotor 2 has a minimum speed required for the successful carrying out of the piecing process, which depends in particular on the design and operating speed of the respective spinning rotor 2. The single motor drive 3 of the spinning rotor 2 is controlled for this purpose by the control mechanism 21. At this instant of the piecing process, regardless of the run-up of the spinning rotor 2, the electric motor drive 24 of the opening roller 12 is also controlled by the control mechanism 23 in such a way that it has a piecing speed that is independent of the minimum speed of the spinning rotor 2, which is above the operating speed. The piecing speed is preferably between 10% and 40% above the operating speed of the opening roller 11 during spinning operation. The piecing speed is achieved prior to the beginning of the piecing process. With the beginning of the piecing process, the fibre band is more intensively combed out by the opening roller 12 rotating at the higher piecing speed, and the conveying speed is increased, compared to that which is the case during normal spinning operation at the operating speed of the opening roller 12. Thus a higher fibre throughput is achieved during the prefeed. The build up of the fibre ring in the spinning rotor 2 accordingly takes place more quickly. On conclusion of the prefeed, the fibre supply is interrupted. The thread end prepared for piecing is now introduced by the draw-off tube 10 into the rotating spinning rotor 2, in which it meets the fibre ring previously built up in the spinning rotor 2. The thread end passes through the fibre ring and is connected to the fibres which are deposited on the thread end, so the piecer is created. The process of the drawing in accumulation following the piecing up of the thread on the fibre ring is used to compensate the delay of the fibre supply occurring between the prefeed for piecing and the restarting of the fibre supply. A delay of the fibre supply means that the thread, during the run-up of the spinning rotor 2, has irregularities in the form of a thin point, which occur directly after the piecer and influence the quality of the thread in a lasting manner. Over the time period for carrying out the piecing and the drawing in accumulation process, the speed of the spinning rotor 2 increases uniformly until the operating speed is reached. Referring to Fig. 2, a graph of a thread profile in the piecing region is shown, which is produced at a piecing speed of the opening roller 12 of about 5,500 min-1. It can clearly be seen here how a thin point is formed after the piecer after the piecing process. This deviation from the thread profile is only adjusted in the further course over the thread length to the desired thread profile when the open end spinning device 1 has reached its operating state after the piecing process; in other words, when, inter alia, the opening roller 12 and the spinning rotor 2 are driven at their respective operating speeds. In contrast to this, Fig. 3 shows a thread profile in the piecing region, which is produced at a piecing speed of the opening roller 12 of about 10,000 min-1. Directly after the piecer, a thread profile is formed, which virtually corresponds to the thread profile, which is achieved during the spinning process. This is to be attributed to the increase in the fibre quantity provided, which is achieved by the increased piecing speed of the opening roller 12. In order to maintain the equality of the thread which is virtually achieved, the piecing speed of the opening roller 12 is only reduced after the complete working off of the drawing in accumulation to the optimal operating speed of the opening roller 12 required for spinning operation. These advantages are only achieved by increasing the piecing speed, with the other spinning and piecing parameters remaining unchanged. The increase in the piecing speed of the opening roller 12 consequently leads, in the piecing region, to an effective combing out of the fibres. WE CLAIM: 1. Method for operating an open end spinning device (1), comprising a spinning rotor (2) and an opening roller (12), which can be driven individually, controlled independently of one another, wherein after an interruption of the spinning process has taken place as a result of the detection of the absence of a thread, a piecing process is introduced, comprising a piecing up process, in which an upper thread passes through a fibre ring formed in the spinning rotor (2) and is connected thereto, as well as a subsequent drawing in accumulation, which is used to reduce a thin point in the thread following the piecer, characterised in that during the piecing process, the opening roller (12) is temporarily driven at a piecing speed, which is above the operating speed of the opening roller (12). 2. Method according to claim 1, characterised in that the piecing speed of the opening roller (12) is reached prior to the beginning of the piecing process. 3. Method according to either of claims 1 or 2, characterised in that the piecing speed of the opening roller (12) is maintained during the complete working off of the drawing in accumulation. 4. Method according to claim 3, characterised in that the speed control of the opening roller (12) during the piecing process and the process of the drawing in accumulation take place independently of other parameters influencing these processes, by means of a control mechanism (21). 5. Method according to any one of claims 1 to 4, characterised in that the piecing speed is between 10% and 40% above the operating speed of the opening roller (12). ABSTRACT The invention relates to a method for operating open-end spinning device (1), comprising a spinning rotor (2) and an opening roller (12), which can be controlled so as to be driven individually independently of one another, wherein after an interruption in the spinning process takes place as a result of the detection of the absence of a thread, a piecing operation is initiated , comprising a piecing process, in which an upper thread passes through a fiber ring formed in the spinning rotor (2) and is connected to the latter, and a subsequent drawing-in accumulating process which serves to reduce a thin point in the thread following the piecer, wherein during the piecing operation, the opening roller (12) is temporarily driven at a piecing speed which is higher than the operating speed of the opening roller(12). To The Controller of Patents The Patent office Mumbai.

Full Text

FORM 2
THE PATENT ACT 1970 (39 of 1970)
&

The Patents Rules, 2003 COMPLETE SPECIFICATION
(See Section 10, and rule 13)

1. TITLE OF INVENTION
METHOD FOR OPERATING AN OPEN- END SPINNING DEVICE

2. APPLICANT(S)
a) Name
b) Nationality
c) Address

OERLIKON TEXTILE GMBH & CO. KG GERMAN Company LANDGRAFENSTRASSE-45, D-41069 MOENCHENGLADBACH, GERMANY

3. PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed:-

ENGLISH TRANSLATION VARIFICATION
CERTIFICATE u/r. 20(3)(b)
I, Mr. HIRAL CHANDRAKANT JOSHI, an authorized agent for the applicant, OERLIKON TEXTILE GMBH & CO. KG do hereby verify that the content of English translated complete specification filed in pursuance of PCT International application No. PCT/EP2006/ 004711 thereof is correct and complete.

The present invention relates to a method for operating an open end spinning device according to the preamble of claim 1.
With increasing requirements of the yarn production process, higher and higher demands are also being made on the production of piecers. The process for forming piecers after thread interruptions, the piecing, is generally carried out at the individual spinning stations of the open end rotor spinning machines by a piecing mechanism travelling along the spinning machine, the so-called piecing carriage.
After a thread break, for example, which triggers the piecing, it takes different lengths of time as a function of the position of the piecing carriage at the open end rotor spinning machine until spinning can start again at the relevant spinning station. During the thread break, the drawing in of the fibre is switched off, but the opening roller, which continues to run, still releases fibres at this time from the tuft. In order to achieve the same conditions during piecing and therefore as far as possible the same prefeed quantity of fibres, the tuft is levelled before each piecing.
The actual process of piecing begins with the start of the spinning rotor. In the time after the tuft levelling of the fibre band presented until the drawing in for the operational fibre feed is switched on, fibres are in turn combed out from the tuft of the fibre band and sucked off via the rotor edge of the stationary spinning rotor.
In addition to the after-running of the fibre flow after switching off the drawing in
and the delayed start-up after switching on the drawing in, the fibre flow may also
react with a delay on increasing the drawing in speed. This can lead to the thread
becoming too thin during the run-up of the spinning rotor. This occurs to a
particularly marked extent at low drawing in speeds. To avoid this undesired
thickness deviation, a drawing in accumulation process can be carried out. Drawing
in accumulation processes of this type during piecing are described in detail, for
example, in DE 40 30 100 Al or in the publication by Raasch et al "Automatisches

Anspinnen beim OE-Rotorspinnen", Melliand Textilberichte 4/1989, pages 251 to 256.
A single motor-driven opening roller for an open end spinning device is known from DE 103 38 842 Al. The opening roller known from this document is used on the open end spinning device in the manner already described in the prior art mentioned above.
It has proven to be disadvantageous that the delay described at the outset also occurs here when providing the required fibre quantity for piecing that is necessary for the drawing in accumulation. However, it is important for the quality of the piecers that the fibre supply takes place in a reproducible manner and without a delay. It is therefore the object of the present invention to provide a method, by means of which the uniformity of the yarn during the spinning process is improved. This object is achieved according to the invention by the characterising features of claim 1. Advantageous configurations of the invention are the subject of the sub-claims.
According to claim 1 it is provided that, during the piecing process, the opening
roller is driven at a piecing speed, which is above the operating speed of the opening
roller. After the process of tuft levelling, which is used to create the same conditions
during piecing, always displaced by the same time span with respect to this process,
a quantity of fibre band is drawn in so as to provide substantially the same fibre
quantity at the beginning of the piecing process. The higher piecing speed compared
to the operating speed of the opening roller brings about a higher fibre throughput,
so after the build up of the fibre ring during the piecing process in the spinning rotor
a fibre quantity is provided for piecing such that after the working off of the fibre
ring, no lack of fibre due to a delay occurs causing a thin point. The higher piecing
speed of the opening roller moreover achieves a more effective combing out of the
fibres, which additionally leads to an improvement in the piecing behaviour.

The piecing speed of the opening roller should preferably be reached before the beginning of the piecing process. The reproducibility of the fibre supply required for the quality of the piecers is thus achieved. Since the fibres are constantly combed out at the same piecing speed of the opening roller, the same fibre quantity is constantly supplied to the spinning rotor during piecing.
In particular, the piecing speed of the opening roller can be maintained during the complete working off of the drawing in accumulation. In this manner, the increased fibre throughput is also kept constant beyond the conclusion of the actual piecing up process so as to avoid, as desired, a thin point adjoining the piecer. Following the drawing in accumulation process, the spinning speed of the opening roller is reduced to the operating speed adapted to the normal spinning operation. This is used to ensure the yarn uniformity of the thread to be spun. The open end spinning device can thus be operated according to the invention at an opening roller speed optimally adapted to these processes both for the piecing process and for the spinning operation.
The speed control of the opening roller during the piecing process and the process of the drawing in accumulation can advantageously take place independently of other parameters influencing these processes by means of a control mechanism. This is achieved by the use of single motor drives, for example for the spinning rotor and the opening roller, which are in each case connected via signal lines to the control mechanism and are controlled by the latter independently of one another.
The invention will be described in more detail below with the aid of an embodiment shown in the drawings, in which:
Fig. 1 shows an open end rotor spinning device with single motor drives at least for
the spinning rotor, opening roller and a control mechanism for these drives;

Fig. 2 shows the profile of a piecer at a piecing speed of the opening roller of 5,500 revolutions per minute;
Fig. 3 shows the profile of a piecer at a piecing speed of the opening roller of 10,000 revolutions per minute.
The view in Fig. 1 shows an open end spinning device 1 of an open end rotor spinning machine, which is arranged in the region of the spinning stations of textile machines of this type. Open end spinning devices 1 of this type are known in principle and described in relative detail, for example, in DE196 50 597 Al.
The open end spinning device 1 comprises a spinning rotor 2 with a rotor cup 4, which revolves during spinning operation at a high speed in a spinning rotor housing 5 which is acted on by a reduced pressure. The rotor housing 5, which is closed at the front by a cover element 8 during spinning operation, is connected for this purpose via a pneumatic line 6 to a reduced pressure source 7, which provides the reduced pressure in the rotor housing 5 necessary for spinning.
The spinning rotor 2 can be driven in a defined manner by a controllable electric motor single drive 3, which is connected via electric lines 20 to the energy supply 23 of the relevant textile machine. The electric motor single drive 3 is connected for this purpose to a control mechanism 21 via at least one signal line 22.
The cover element 8, which closes the rotor housing 5 during the spinning operation, is mounted so as to be rotatable to a limited extent about a pivot pin 16, so the stationary spinning rotor 4 is accessible if necessary. A so-called channel plate adapter 9 is also let into the cover element 8, so as to be replaceable, at the level of the spinning rotor 2 and is adjoined by a thread draw-off tube 10. Furthermore, the cover element 8 has an opening roller housing 11, in which an opening roller 12

rotates and is fixed by its bearing shaft 17 in a rear bearing bracket 14 of the opening roller housing 11.
The opening roller 12 is driven by an electric motor single drive 24, which is configured as an external rotor, and for easy detachable coupling to the energy supply 23 of the open end rotor spinning machine has a contact track mechanism 18 at the end region of its bearing shaft 17. The electric motor single drive 24 is also connected via a signal line to the control mechanism 21 and can be controlled thereby.
A fibre band draw-in cylinder 13 is also rotatably mounted in the opening roller 11 and can be acted upon by an electric motor by means of a drive 15, a stepping motor. The drive 15 is also connected by an electric line 26 to the energy supply 23 of the textile machine and by a signal line 25 to the control mechanism 21.
Once an interruption of the spinning process has occurred because of the detection of the absence of a thread by means of a thread monitoring device, not shown, the spinning device 1 is firstly shut down. A piecing process for thread connection is then initiated. The piecing process begins with the tuft levelling to provide the same preconditions for the piecing process, regardless of how long the shut down of the spinning device 1 lasts. Following the tuft levelling, the spinning rotor 2, which has a speed of about 120,000 min-1 or more during spinning operation, is initially run up in such a way that the spinning rotor 2 has a minimum speed required for the successful carrying out of the piecing process, which depends in particular on the design and operating speed of the respective spinning rotor 2. The single motor drive 3 of the spinning rotor 2 is controlled for this purpose by the control mechanism 21.
At this instant of the piecing process, regardless of the run-up of the spinning rotor
2, the electric motor drive 24 of the opening roller 12 is also controlled by the control

mechanism 23 in such a way that it has a piecing speed that is independent of the minimum speed of the spinning rotor 2, which is above the operating speed. The piecing speed is preferably between 10% and 40% above the operating speed of the opening roller 11 during spinning operation.
The piecing speed is achieved prior to the beginning of the piecing process. With the beginning of the piecing process, the fibre band is more intensively combed out by the opening roller 12 rotating at the higher piecing speed, and the conveying speed is increased, compared to that which is the case during normal spinning operation at the operating speed of the opening roller 12. Thus a higher fibre throughput is achieved during the prefeed. The build up of the fibre ring in the spinning rotor 2 accordingly takes place more quickly. On conclusion of the prefeed, the fibre supply is interrupted.
The thread end prepared for piecing is now introduced by the draw-off tube 10 into the rotating spinning rotor 2, in which it meets the fibre ring previously built up in the spinning rotor 2. The thread end passes through the fibre ring and is connected to the fibres which are deposited on the thread end, so the piecer is created.
The process of the drawing in accumulation following the piecing up of the thread on the fibre ring is used to compensate the delay of the fibre supply occurring between the prefeed for piecing and the restarting of the fibre supply. A delay of the fibre supply means that the thread, during the run-up of the spinning rotor 2, has irregularities in the form of a thin point, which occur directly after the piecer and influence the quality of the thread in a lasting manner. Over the time period for carrying out the piecing and the drawing in accumulation process, the speed of the spinning rotor 2 increases uniformly until the operating speed is reached.
Referring to Fig. 2, a graph of a thread profile in the piecing region is shown, which
is produced at a piecing speed of the opening roller 12 of about 5,500 min-1. It can

clearly be seen here how a thin point is formed after the piecer after the piecing process. This deviation from the thread profile is only adjusted in the further course over the thread length to the desired thread profile when the open end spinning device 1 has reached its operating state after the piecing process; in other words, when, inter alia, the opening roller 12 and the spinning rotor 2 are driven at their respective operating speeds.
In contrast to this, Fig. 3 shows a thread profile in the piecing region, which is produced at a piecing speed of the opening roller 12 of about 10,000 min-1. Directly after the piecer, a thread profile is formed, which virtually corresponds to the thread profile, which is achieved during the spinning process. This is to be attributed to the increase in the fibre quantity provided, which is achieved by the increased piecing speed of the opening roller 12.
In order to maintain the equality of the thread which is virtually achieved, the piecing speed of the opening roller 12 is only reduced after the complete working off of the drawing in accumulation to the optimal operating speed of the opening roller 12 required for spinning operation.
These advantages are only achieved by increasing the piecing speed, with the other spinning and piecing parameters remaining unchanged. The increase in the piecing speed of the opening roller 12 consequently leads, in the piecing region, to an effective combing out of the fibres.

WE CLAIM:
1. Method for operating an open end spinning device (1), comprising a spinning rotor (2) and an opening roller (12), which can be driven individually, controlled independently of one another, wherein after an interruption of the spinning process has taken place as a result of the detection of the absence of a thread, a piecing process is introduced, comprising a piecing up process, in which an upper thread passes through a fibre ring formed in the spinning rotor (2) and is connected thereto, as well as a subsequent drawing in accumulation, which is used to reduce a thin point in the thread following the piecer, characterised in that during the piecing process, the opening roller (12) is temporarily driven at a piecing speed, which is above the operating speed of the opening roller (12).
2. Method according to claim 1, characterised in that the piecing speed of the opening roller (12) is reached prior to the beginning of the piecing process.
3. Method according to either of claims 1 or 2, characterised in that the piecing speed of the opening roller (12) is maintained during the complete working off of the drawing in accumulation.
4. Method according to claim 3, characterised in that the speed control of the opening roller (12) during the piecing process and the process of the drawing in accumulation take place independently of other parameters influencing these processes, by means of a control mechanism (21).

5. Method according to any one of claims 1 to 4, characterised in that the piecing speed is between 10% and 40% above the operating speed of the opening roller (12).

ABSTRACT
The invention relates to a method for operating open-end spinning device (1), comprising a spinning rotor (2) and an opening roller (12), which can be controlled so as to be driven individually independently of one another, wherein after an interruption in the spinning process takes place as a result of the detection of the absence of a thread, a piecing operation is initiated , comprising a piecing process, in which an upper thread passes through a fiber ring formed in the spinning rotor (2) and is connected to the latter, and a subsequent drawing-in accumulating process which serves to reduce a thin point in the thread following the piecer, wherein during the piecing operation, the opening roller (12) is temporarily driven at a piecing speed which is higher than the operating speed of the opening roller(12).
To
The Controller of Patents
The Patent office
Mumbai.

Documents:

294-mumnp-2008-abstract(18-2-2008).pdf

294-MUMNP-2008-ABSTRACT(GRANTED)-(28-1-2013).pdf

294-mumnp-2008-abstract.doc

294-MUMNP-2008-CANCELLED PAGES(15-11-2011).pdf

294-mumnp-2008-claims(18-2-2008).pdf

294-MUMNP-2008-CLAIMS(AMENDED)-(18-1-2013).pdf

294-MUMNP-2008-CLAIMS(GRANTED)-(28-1-2013).pdf

294-MUMNP-2008-CLAIMS(MARKED COPY)-(18-1-2013).pdf

294-mumnp-2008-claims.doc

294-MUMNP-2008-CORRESPONDENCE(15-11-2011).pdf

294-mumnp-2008-correspondence(26-3-2008).pdf

294-MUMNP-2008-CORRESPONDENCE(IPO)-(28-1-2013).pdf

294-mumnp-2008-correspondence-others.pdf

294-mumnp-2008-correspondence-received.pdf

294-mumnp-2008-description (complete).pdf

294-mumnp-2008-description(complete)-(18-2-2008).pdf

294-MUMNP-2008-DESCRIPTION(GRANTED)-(28-1-2013).pdf

294-MUMNP-2008-DRAWING(15-11-2011).pdf

294-mumnp-2008-drawing(18-2-2008).pdf

294-MUMNP-2008-DRAWING(GRANTED)-(28-1-2013).pdf

294-mumnp-2008-drawings.pdf

294-MUMNP-2008-ENGLISH TRANSLATION(15-11-2011).pdf

294-mumnp-2008-form 1(26-3-2008).pdf

294-mumnp-2008-form 2(18-2-2008).pdf

294-MUMNP-2008-FORM 2(GRANTED)-(28-1-2013).pdf

294-mumnp-2008-form 2(title page)-(18-2-2008).pdf

294-MUMNP-2008-FORM 2(TITLE PAGE)-(GRANTED)-(28-1-2013).pdf

294-MUMNP-2008-FORM 3(15-11-2011).pdf

294-MUMNP-2008-FORM 5(15-11-2011).pdf

294-mumnp-2008-form-1.pdf

294-mumnp-2008-form-18.pdf

294-mumnp-2008-form-2.doc

294-mumnp-2008-form-2.pdf

294-mumnp-2008-form-26.pdf

294-mumnp-2008-form-3.pdf

294-mumnp-2008-form-5.pdf

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Patent Number

255132

Indian Patent Application Number

294/MUMNP/2008

PG Journal Number

05/2013

Publication Date

01-Feb-2013

Grant Date

28-Jan-2013

Date of Filing

18-Feb-2008

Name of Patentee

OERLIKON TEXTILE GMBH & CO. KG

Applicant Address

LANDGRAFENSTRASSE-45, D-41069 MOENCHENGLADBACH,

Inventors:

#	Inventor's Name	Inventor's Address
1	LASSMANN MANFRED	DAHLIENWEG 5, 41334 NETTETAL

PCT International Classification Number

D01H4/50,D01H4/44

PCT International Application Number

PCT/EP2006/004711

PCT International Filing date

2006-05-18

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	102005033562.4	2005-07-19	Germany