Title of Invention	A WINDING MECHANISM OF TEXTILE MACHINE WITH LEVER ARRANGEMENT COMPRISING PNEUMATIC CYLINDER & METHOD THEREOF
Abstract	The invention relates to a method for operating a winding mechanism and to a winding mechanism of a textile machine with a lever arrangement (40) for controlling the contact pressure of a bobbin (30) placed by a bobbin holder (32) on a drive roller (20) with a loading means (50) which is placed on a lever arm and exerts a variable torque on the bobbin holder (32), the torque firstly loading the bobbin in the direction of the drive roller (20) when the bobbin (30) is being built-up and, during the further build-up of the bobbin (30), relieving the load thereon, wherein to accelerate the bobbin (30), the force of the loading means (50) placed on the lever arm is controlled in such a way that it brings about a contact pressure which is adequately high for the acceleration, of the bobbin (30) placed on the drive roller (20).

Title of Invention

A WINDING MECHANISM OF TEXTILE MACHINE WITH LEVER ARRANGEMENT COMPRISING PNEUMATIC CYLINDER & METHOD THEREOF

Abstract

The invention relates to a method for operating a winding mechanism and to a winding mechanism of a textile machine with a lever arrangement (40) for controlling the contact pressure of a bobbin (30) placed by a bobbin holder (32) on a drive roller (20) with a loading means (50) which is placed on a lever arm and exerts a variable torque on the bobbin holder (32), the torque firstly loading the bobbin in the direction of the drive roller (20) when the bobbin (30) is being built-up and, during the further build-up of the bobbin (30), relieving the load thereon, wherein to accelerate the bobbin (30), the force of the loading means (50) placed on the lever arm is controlled in such a way that it brings about a contact pressure which is adequately high for the acceleration, of the bobbin (30) placed on the drive roller (20).

Full Text	FORM 2 THE PATENT ACT 1970 {39 of 1970) The Patents Rules, 2003 COMPLETE SPECIFICATION (See Section 10, and rule 13) TITLE OF INVENTION METHOD FOR OPERATING A WINDING MECHANISM AND A TEXTILE MACHINE APPLICANTS) a) Name b) Nationality c) Address OERLIKON TEXTILE GMBH & CO KG GERMAN Company LEVERKUSER STRASSE 65' D-42897 REMSCHEID, GERMANY 3. PREAMBLE TO THE DESCRIPTION The following specification particularly describes the invention and the manner in which it is to be performed : I, ASTRID TERRY, translator of 11, Bounds Oak Way, Tunbridge Wells, Kent. TN4 OUB, England, confirm that I am conversant with the English and German languages and I am a competent translator from one to the other. I declare to the best of my knowledge and belief that the attached English translation is a true and correct translation of the Paten No. DE 10 2007 048 722.5 Dated this 19th day of September 2008. The invention relates to a method for operating, a winding mechanism and to a winding mechanism of a textile machine with a lever arrangement for controlling the contact pressure of a bobbin placed by a bobbin holder on a drive roller, with a loading means which is placed on a lever arm and exerts a variable torque on the bobbin holder, the torque firstly loading the bobbin in the direction of the drive roller when the bobbin is being built-up and relieving the load on the bobbin during the further build-up thereof. A winding mechanism of this type is known from DE 25 18 646 Al. The contact pressure of the bobbin on the drive roller influences the bobbin density and bobbin stability to a great degree. Thus, for example, dye bobbins are produced with a contact pressure which is small and as constant as possible. Bobbins, of which good thread draw-off properties are expected, are produced, on the other hand, with a very high contact pressure at the beginning of the winding and with a decreasing contact pressure with the growing bobbin diameter. The contact pressure of the bobbin is determined, on the one hand, by the torque on the bobbin holder and, on the other hand, by the weight of the bobbin, which increases with the increasing diameter. In order to obtain a constant contact pressure, the torque on the bobbin holder thus has to be reduced with the increasing bobbin build-up. The same applies if a decreasing contact pressure is required. Generally, it is the case that during the build-up of the bobbin, the torque firstly increases the contact pressure of the bobbin. At a certain bobbin diameter, the weight of the bobbin is then sufficient to apply the necessary contact pressure. The lever arrangement is adjusted such that no torque acts on the bobbin holder at this bobbin diameter. With a further increasing bobbin diameter, the direction of action of the torque reverses, and the leyer arrangement brings about a relief of the contact pressure, caused by weight, of the bobbin. After the insertion of a new bobbin tube or after a thread breakage, the bobbin has to be accelerated. It is conceivable here to use a separate drive for this operating state. 2 The winding mechanism is, however, significantly more simply configured if the same drive can be used to accelerate the bobbin as during normal winding operation. However, it has to be noted, that to accelerate the bobbin, an adequate contact pressure on the drive roller is necessary. DE 41 21 775 Al discloses a winding device with a drive roller in which the contact pressure of the bobbin can be rapidly and automatically adapted as a function of the operating situation, for example after a thread breakage. This device has a lever arrangement with a loading means, which brings about the basic loading or relieving of load during the normal bobbin build¬up. To adapt the contact pressure to other operating situations, a pneumatic cylinder is additionally provided, the torque acting on the bobbin holder from the cylinder not reversing its rotary effect on the bobbin holder during the entire bobbin build¬up. Proceeding from the prior art mentioned above, the present invention is based on the object of simplifying the adaptation of the contact pressure of the bobbin on the drive roller for the acceleration thereof. To achieve this object, a method is proposed for operating a winding mechanism of a textile machine with a lever arrangement for controlling the contact pressure of a bobbin placed by the bobbin holder on a drive roller, with a loading means which is placed on a lever arm and which exerts a variable torque on the bobbin holder, the torque firstly loading the bobbin in the direction of the drive roller when the bobbin is being built-up and relieving the load on the bobbin during the further build-up thereof, and to accelerate the bobbin, the force of the loading means placed on the lever arm is controlled in such a way that it brings about a contact pressure which is adequately high for the acceleration, of the bobbin placed on the drive roller. The method according to the invention in this case makes use of a simple device known for the normal winding operation, in which the active lever arm, on which the loading means engages, changes with the bobbin diameter. According to the invention, to accelerate the bobbin, the force effect of the loading means is adjusted 3 as a function of the position of the lever arrangement. For the method according to the invention, during the acceleration, the same loading means is used that is necessary in any case for the normal winding operation. Therefore, an additional loading means can be dispensed with. According to a preferred embodiment of the method according to the invention, the force exerted by the loading means for acceleration remains unchanged relative to stationary winding operation if the torque acting on the bobbin holder assists the pressing force of the bobbin and the loading means, during acceleration, in contrast to the stationary winding operation, does not exert any force when the torque on the bobbin holder relieves the load on the bobbin. This embodiment is particularly simple as the loading means only has to be relieved of the load or remains unchanged. While the bobbin is pressed by the torque acting on the bobbin holder onto the drive roller, the bobbin diameter is small. The same applies to the moment of inertia of the bobbin, so the contact pressure of the normal winding operation is adequate to accelerate the bobbin. If the larger bobbin is pressed away from the drive roller by the torque acting on the bobbin holder, a relief of the load of the loading means immediately leads to the desired contact pressure increase. A bobbin with a large diameter has a correspondingly large weight. Thus, a corresponding contact pressure increase is also achieved during the acceleration owing to the removal of the relief of the load. However, this is also necessary for the acceleration as a large bobbin also has a large moment of inertia. In this manner, the pressing force of the bobbin automatically increases with the increase in its inertia. To achieve the object, a winding mechanism of a textile machine with a lever arrangement for controlling the contact pressure of a bobbin placed by a bobbin holder on a drive roller with a loading means which is placed on a lever arm and exerts a torque on the bobbin holder/is also proposed, the torque firstly loading the bobbin in the direction of the drive roller, while the bobbin is being built-up and relieving the load on the bobbin during the further build-up of the bobbin, and to 4 accelerate the bobbin, control means control the force of the loading means applied to the lever arm in such a way that it brings about a contact pressure which is adequately high for the acceleration, of the bobbin placed on the drive roller. According to an embodiment of the device according to the invention, the control means keep the force exerted by the loading means constant for acceleration if the torque acting on the bobbin holder assists the contact force of the bobbin and the control means activate the loading means during acceleration in such a way that it does not exert any force if the torque on the bobbin holder relieves the load on the bobbin prior to the acceleration. According to a preferred embodiment of the device according to the invention, the loading means is a pneumatic cylinder, and the control means achieve the removal of the force by the removal of the air pressure. The control means are designed particularly simply, in this case, as no laborious pressure control is required. In principle, the use of a spring is also possible. A device is then necessary which completely relieves the load on the spring and then loads it again. It is conceivable, to select the same device which is used for the prestressing of the loading means. As mentioned, different bobbin properties can be achieved by the prestressing. According to an embodiment of the device according to the invention, the textile machine is an open-end spinning machine and the bobbin is accelerated during the piecing process. Likewise, the textile machine may also be a winding machine, however, in which the bobbin is accelerated after a thread breakage. The invention will be described in more detail below with the aid of an embodiment shown in the drawings, in which: Fig. 1 shows a winding mechanism according to the invention at the beginning of the bobbin build-up; 5 Fig. 2 shows a winding mechanism according to the invention with a bobbin with a relatively large diameter. Fig. 1 and Fig. 2 show a winding mechanism according to the invention. In this case, the arrangement in Fig. 1 is shown at the beginning of the bobbin build-up and in Fig. 2 with an advanced bobbin build-up. The bobbin 30 is wound onto a bobbin tube 31, which is fastened to a bobbin holder 32. The bobbin is pressed by the bobbin holder onto the drive roller 20 and the thread 10, which is wound onto the bobbin tube, is guided by the thread guide 11. The bobbin holder 32 is connected to a lever arrangement 40. The lever arrangement has a stationary rotational axle 41 and a lever 42. The lever is thus rigidly connected to the bobbin holder. Arranged between the centre joint 43 and the stationary foot joint 44 of the lever arrangement is a pneumatic cylinder 50. The centre joint 43 is also connected to the lever 42. The pneumatic cylinder 50 has a pressure valve 51, which is connected by means of a control line 61 to the control means 60. The control means can thus adjust the air pressure in the pneumatic cylinder by means of the control line 61 and the pressure valve 51. According to the required bobbin properties, a defined air pressure is adjusted for the winding operation for the prestressing of the pneumatic cylinder. The preadjusted air pressure generally remains constant during the normal winding operation. During the build-up of the bobbin, the bobbin holder moves around the rotational axle 41. Proceeding from the view in Fig. 1, at the beginning of the winding process, the centre joint 43 therefore moves toward the centre line 45. As a result, the lever arm and therefore the torque on the bobbin holder is reduced. When the centre joint has reached the centre axis, no torque is exerted on the bobbin holder. The contact pressure on the drive roller is then determined only by the weight of the bobbin. As 6 the bobbin diameter further increases, the centre joint passes the centre line. Thus the torque reverses its sign and leads to a relief of the contact pressure. A situation of this type is shown in Fig. 2. As already mentioned, Fig. 1 shows the situation at the beginning of the winding process. The torque on the bobbin holder presses the bobbin or the bobbin tube onto the drive roller. According to the invention, the control means keep the preadjusted air pressure constant during the acceleration of this bobbin. The contact pressure acting on the drive roller owing to the torque on the bobbin holder is adequate to accelerate the bobbin tube or a bobbin with a small diameter. If the bobbin in Fig. 2 has to be accelerated again after a thread breakage, according to the invention, the pressure cylinder is completely evacuated of air by the control means and as a result, the contact pressure on the drive roller is increased by the inherent weight of the bobbin. 7 CLAIM: 1. Method for operating a winding mechanism of a textile machine with a lever arrangement (40) for controlling the contact pressure of a bobbin (30) placed by a bobbin holder (32) on a drive roller (20) with a loading means (50) which is placed on a lever arm and exerts a variable torque on the bobbin holder (32), the torque firstly loading the bobbin in the direction of the drive roller (20) when the bobbin (30) is being built-up and, during the further build-up of the bobbin (30), relieving the load thereon, characterised in that to accelerate the bobbin (30), the force of the loading means (50) placed on the lever arm is controlled in such a way that it brings about a contact pressure which is adequately high for the acceleration, of the bobbin (30) placed on the drive roller (20). 2. Method according to claim 1, characterised in that the force exerted by the loading means (50) for acceleration remains unchanged if the torque acting on the bobbin holder (32) assists the pressing force of the bobbin and in that the loading means (50) does not exert any force during acceleration if the torque on the bobbin holder (32) relieves the load on the bobbin (30) prior to the acceleration. 3. Winding mechanism of a textile machine with a lever arrangement (40) for controlling the contact pressure of a bobbin (30) placed by a bobbin holder (32) on a drive roller (20) with a loading means (50) which is placed on a lever arm and exerts a variable torque on the bobbin holder (32), the torque firstly loading the bobbin in the direction of the drive roller (20) during the build-up of the bobbin (30) and relieving the load on the bobbin during the further build-up of the bobbin (30), characterised in that to accelerate the bobbin (30), control means (60) control the force of the loading means (50) placed on the lever arm in such a way that it brings about a contact pressure, which is 8 adequately high for the acceleration, of the bobbin (30) placed on the drive roller (20). 4. Device according to claim 3, characterised in that the control means keep the force exerted by the loading means (50) constant for acceleration when the torque acting on the bobbin holder (32) assists the pressing force of the bobbin, and in that the control means (60) activate the loading means (50) during acceleration in such a way that it does not exert any force if the torque on the bobbin holder (32) relieves the load on the bobbin (30) prior to the acceleration. 5. Device according to claim 4, characterised in that the loading means is a pneumatic cylinder (50) and the control means (60) achieve the removal of the force by the removal of the air pressure. 6. Device according to any one of the preceding claims, characterised in that the textile machine is an open-end spinning machine and in that the bobbin (30) is accelerated during the piecing process. Dated this 6th day of October, 2008 HIRAL CHANDRAKANT JOSHI AGENT FOR OERLIKON TEXTILE GMBH & CO. KG 9

Full Text

FORM 2
THE PATENT ACT 1970 {39 of 1970)
The Patents Rules, 2003 COMPLETE SPECIFICATION (See Section 10, and rule 13)
TITLE OF INVENTION
METHOD FOR OPERATING A WINDING MECHANISM AND
A TEXTILE MACHINE

APPLICANTS)
a) Name
b) Nationality
c) Address

OERLIKON TEXTILE GMBH & CO KG GERMAN Company LEVERKUSER STRASSE 65' D-42897 REMSCHEID,
GERMANY

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

I, ASTRID TERRY, translator of 11, Bounds Oak Way, Tunbridge Wells, Kent. TN4 OUB, England, confirm that I am conversant with the English and German languages and I am a competent translator from one to the other. I declare to the best of my knowledge and belief that the attached English translation is a true and correct translation of the Paten No. DE 10 2007 048 722.5

Dated this 19th day of September 2008.

The invention relates to a method for operating, a winding mechanism and to a winding mechanism of a textile machine with a lever arrangement for controlling the contact pressure of a bobbin placed by a bobbin holder on a drive roller, with a loading means which is placed on a lever arm and exerts a variable torque on the bobbin holder, the torque firstly loading the bobbin in the direction of the drive roller when the bobbin is being built-up and relieving the load on the bobbin during the further build-up thereof.
A winding mechanism of this type is known from DE 25 18 646 Al. The contact pressure of the bobbin on the drive roller influences the bobbin density and bobbin stability to a great degree. Thus, for example, dye bobbins are produced with a contact pressure which is small and as constant as possible. Bobbins, of which good thread draw-off properties are expected, are produced, on the other hand, with a very high contact pressure at the beginning of the winding and with a decreasing contact pressure with the growing bobbin diameter.
The contact pressure of the bobbin is determined, on the one hand, by the torque on the bobbin holder and, on the other hand, by the weight of the bobbin, which increases with the increasing diameter. In order to obtain a constant contact pressure, the torque on the bobbin holder thus has to be reduced with the increasing bobbin build-up. The same applies if a decreasing contact pressure is required. Generally, it is the case that during the build-up of the bobbin, the torque firstly increases the contact pressure of the bobbin. At a certain bobbin diameter, the weight of the bobbin is then sufficient to apply the necessary contact pressure. The lever arrangement is adjusted such that no torque acts on the bobbin holder at this bobbin diameter. With a further increasing bobbin diameter, the direction of action of the torque reverses, and the leyer arrangement brings about a relief of the contact pressure, caused by weight, of the bobbin.
After the insertion of a new bobbin tube or after a thread breakage, the bobbin has to be accelerated. It is conceivable here to use a separate drive for this operating state.
2

The winding mechanism is, however, significantly more simply configured if the same drive can be used to accelerate the bobbin as during normal winding operation. However, it has to be noted, that to accelerate the bobbin, an adequate contact pressure on the drive roller is necessary. DE 41 21 775 Al discloses a winding device with a drive roller in which the contact pressure of the bobbin can be rapidly and automatically adapted as a function of the operating situation, for example after a thread breakage. This device has a lever arrangement with a loading means, which brings about the basic loading or relieving of load during the normal bobbin build¬up. To adapt the contact pressure to other operating situations, a pneumatic cylinder is additionally provided, the torque acting on the bobbin holder from the cylinder not reversing its rotary effect on the bobbin holder during the entire bobbin build¬up.
Proceeding from the prior art mentioned above, the present invention is based on the object of simplifying the adaptation of the contact pressure of the bobbin on the drive roller for the acceleration thereof.
To achieve this object, a method is proposed for operating a winding mechanism of a textile machine with a lever arrangement for controlling the contact pressure of a bobbin placed by the bobbin holder on a drive roller, with a loading means which is placed on a lever arm and which exerts a variable torque on the bobbin holder, the torque firstly loading the bobbin in the direction of the drive roller when the bobbin is being built-up and relieving the load on the bobbin during the further build-up thereof, and to accelerate the bobbin, the force of the loading means placed on the lever arm is controlled in such a way that it brings about a contact pressure which is adequately high for the acceleration, of the bobbin placed on the drive roller.
The method according to the invention in this case makes use of a simple device known for the normal winding operation, in which the active lever arm, on which the loading means engages, changes with the bobbin diameter. According to the invention, to accelerate the bobbin, the force effect of the loading means is adjusted
3

as a function of the position of the lever arrangement. For the method according to the invention, during the acceleration, the same loading means is used that is necessary in any case for the normal winding operation. Therefore, an additional loading means can be dispensed with.
According to a preferred embodiment of the method according to the invention, the force exerted by the loading means for acceleration remains unchanged relative to stationary winding operation if the torque acting on the bobbin holder assists the pressing force of the bobbin and the loading means, during acceleration, in contrast to the stationary winding operation, does not exert any force when the torque on the bobbin holder relieves the load on the bobbin.
This embodiment is particularly simple as the loading means only has to be relieved of the load or remains unchanged. While the bobbin is pressed by the torque acting on the bobbin holder onto the drive roller, the bobbin diameter is small. The same applies to the moment of inertia of the bobbin, so the contact pressure of the normal winding operation is adequate to accelerate the bobbin. If the larger bobbin is pressed away from the drive roller by the torque acting on the bobbin holder, a relief of the load of the loading means immediately leads to the desired contact pressure increase. A bobbin with a large diameter has a correspondingly large weight. Thus, a corresponding contact pressure increase is also achieved during the acceleration owing to the removal of the relief of the load. However, this is also necessary for the acceleration as a large bobbin also has a large moment of inertia. In this manner, the pressing force of the bobbin automatically increases with the increase in its inertia.
To achieve the object, a winding mechanism of a textile machine with a lever arrangement for controlling the contact pressure of a bobbin placed by a bobbin holder on a drive roller with a loading means which is placed on a lever arm and exerts a torque on the bobbin holder/is also proposed, the torque firstly loading the bobbin in the direction of the drive roller, while the bobbin is being built-up and relieving the load on the bobbin during the further build-up of the bobbin, and to
4

accelerate the bobbin, control means control the force of the loading means applied to the lever arm in such a way that it brings about a contact pressure which is adequately high for the acceleration, of the bobbin placed on the drive roller.
According to an embodiment of the device according to the invention, the control means keep the force exerted by the loading means constant for acceleration if the torque acting on the bobbin holder assists the contact force of the bobbin and the control means activate the loading means during acceleration in such a way that it does not exert any force if the torque on the bobbin holder relieves the load on the bobbin prior to the acceleration.
According to a preferred embodiment of the device according to the invention, the loading means is a pneumatic cylinder, and the control means achieve the removal of the force by the removal of the air pressure. The control means are designed particularly simply, in this case, as no laborious pressure control is required.
In principle, the use of a spring is also possible. A device is then necessary which completely relieves the load on the spring and then loads it again. It is conceivable, to select the same device which is used for the prestressing of the loading means. As mentioned, different bobbin properties can be achieved by the prestressing.
According to an embodiment of the device according to the invention, the textile machine is an open-end spinning machine and the bobbin is accelerated during the piecing process. Likewise, the textile machine may also be a winding machine, however, in which the bobbin is accelerated after a thread breakage.
The invention will be described in more detail below with the aid of an embodiment shown in the drawings, in which:
Fig. 1 shows a winding mechanism according to the invention at the beginning of the bobbin build-up;
5

Fig. 2 shows a winding mechanism according to the invention with a bobbin with a relatively large diameter.
Fig. 1 and Fig. 2 show a winding mechanism according to the invention. In this case, the arrangement in Fig. 1 is shown at the beginning of the bobbin build-up and in Fig. 2 with an advanced bobbin build-up. The bobbin 30 is wound onto a bobbin tube 31, which is fastened to a bobbin holder 32. The bobbin is pressed by the bobbin holder onto the drive roller 20 and the thread 10, which is wound onto the bobbin tube, is guided by the thread guide 11.
The bobbin holder 32 is connected to a lever arrangement 40. The lever arrangement has a stationary rotational axle 41 and a lever 42. The lever is thus rigidly connected to the bobbin holder. Arranged between the centre joint 43 and the stationary foot joint 44 of the lever arrangement is a pneumatic cylinder 50. The centre joint 43 is also connected to the lever 42.
The pneumatic cylinder 50 has a pressure valve 51, which is connected by means of a control line 61 to the control means 60. The control means can thus adjust the air pressure in the pneumatic cylinder by means of the control line 61 and the pressure valve 51. According to the required bobbin properties, a defined air pressure is adjusted for the winding operation for the prestressing of the pneumatic cylinder. The preadjusted air pressure generally remains constant during the normal winding operation.
During the build-up of the bobbin, the bobbin holder moves around the rotational axle 41. Proceeding from the view in Fig. 1, at the beginning of the winding process, the centre joint 43 therefore moves toward the centre line 45. As a result, the lever arm and therefore the torque on the bobbin holder is reduced. When the centre joint has reached the centre axis, no torque is exerted on the bobbin holder. The contact pressure on the drive roller is then determined only by the weight of the bobbin. As
6

the bobbin diameter further increases, the centre joint passes the centre line. Thus the torque reverses its sign and leads to a relief of the contact pressure. A situation of this type is shown in Fig. 2.
As already mentioned, Fig. 1 shows the situation at the beginning of the winding process. The torque on the bobbin holder presses the bobbin or the bobbin tube onto the drive roller. According to the invention, the control means keep the preadjusted air pressure constant during the acceleration of this bobbin. The contact pressure acting on the drive roller owing to the torque on the bobbin holder is adequate to accelerate the bobbin tube or a bobbin with a small diameter.
If the bobbin in Fig. 2 has to be accelerated again after a thread breakage, according to the invention, the pressure cylinder is completely evacuated of air by the control means and as a result, the contact pressure on the drive roller is increased by the inherent weight of the bobbin.
7

CLAIM:
1. Method for operating a winding mechanism of a textile machine with a lever arrangement (40) for controlling the contact pressure of a bobbin (30) placed by a bobbin holder (32) on a drive roller (20) with a loading means (50) which is placed on a lever arm and exerts a variable torque on the bobbin holder (32), the torque firstly loading the bobbin in the direction of the drive roller (20) when the bobbin (30) is being built-up and, during the further build-up of the bobbin (30), relieving the load thereon, characterised in that to accelerate the bobbin (30), the force of the loading means (50) placed on the lever arm is controlled in such a way that it brings about a contact pressure which is adequately high for the acceleration, of the bobbin (30) placed on the drive roller (20).
2. Method according to claim 1, characterised in that the force exerted by the loading means (50) for acceleration remains unchanged if the torque acting on the bobbin holder (32) assists the pressing force of the bobbin and in that the loading means (50) does not exert any force during acceleration if the torque on the bobbin holder (32) relieves the load on the bobbin (30) prior to the acceleration.
3. Winding mechanism of a textile machine with a lever arrangement (40) for controlling the contact pressure of a bobbin (30) placed by a bobbin holder (32) on a drive roller (20) with a loading means (50) which is placed on a lever arm and exerts a variable torque on the bobbin holder (32), the torque firstly loading the bobbin in the direction of the drive roller (20) during the build-up of the bobbin (30) and relieving the load on the bobbin during the further build-up of the bobbin (30), characterised in that to accelerate the bobbin (30), control means (60) control the force of the loading means (50) placed on the lever arm in such a way that it brings about a contact pressure, which is
8

adequately high for the acceleration, of the bobbin (30) placed on the drive roller (20).
4. Device according to claim 3, characterised in that the control means keep the force exerted by the loading means (50) constant for acceleration when the torque acting on the bobbin holder (32) assists the pressing force of the bobbin, and in that the control means (60) activate the loading means (50) during acceleration in such a way that it does not exert any force if the torque on the bobbin holder (32) relieves the load on the bobbin (30) prior to the acceleration.
5. Device according to claim 4, characterised in that the loading means is a pneumatic cylinder (50) and the control means (60) achieve the removal of the force by the removal of the air pressure.
6. Device according to any one of the preceding claims, characterised in that the textile machine is an open-end spinning machine and in that the bobbin (30) is accelerated during the piecing process.
Dated this 6th day of October, 2008

HIRAL CHANDRAKANT JOSHI
AGENT FOR
OERLIKON TEXTILE GMBH & CO. KG
9

A WINDING MECHANISM OF TEXTILE MACHINE WITH LEVER ARRANGEMENT COMPRISING PNEUMATIC CYLINDER & METHOD THEREOF

Documents:

Inventors:

PCT Conventions: