RINGSPINNING SYSTEM FOR PRODUCING A YARN AND METHOD FOR STOPPING THE SUPPLY OF FILAMENTS TO A DRAFTING STAGE OF A RINGSPINNING SYSTEM

Abstract

The present disclosure provides a ringspinning system for producing a yarn. It is provided a the ringspinning system comprising a bobbin holder for holding a bobbin from which a first filament is supplied, a drafting stage for drafting the first filament together with a second filament, which is fed to the drafting stage, and a spindle, the ringspinning system further contains at least one sensor for detecting a breakage of the first and/or second filament and/or a roving comprising the first and second filament, which roving comes out of the drafting stage, and a clamp assembly comprising a clamp for fixing the second filament in the case that the sensor detects the breakage, wherein the clamp is provided adjacent the bobbin holder. It is further provided a method for stopping the supply of filaments to a drafting stage of a ring spinning system.

Claims

1. A ringspinning system for producing a yarn, the ringspinning system comprising a bobbin holder for holding a bobbin from which a first filament is supplied, a drafting stage for drafting the first filament together with a second filament, which is fed to the drafting stage, and a spindle, which is provided downstream of the drafting stage on which the ring spun yarn is wound up, wherein the ringspinning system further contains at least one sensor for detecting a breakage of the first and/or second filament and/or a roving comprising the first and second filament, which roving comes out of the drafting stage, and a clamp assembly comprising a clamp for fixing the second filament in the case that the sensor detects the breakage, wherein the clamp is provided adjacent the bobbin holder.

2. The ringspinning system of claim 1, wherein the clamp assembly comprises a mounting plate which is placed adjacent to the bobbin, which mounting plate is arranged perpendicular to a rotation axis of the bobbin such that the rotation axis of the bobbin extend through the mounting plate, and a first and second clamp arm being rotatable with respect to each other about an axis, each of the first and second clamp arm having a fixing surface to fix the second filament therebetween.

3. The ringspinning system of claim 2, wherein the first clamp arm and the second clamp arm is rotatably mounted on the mounting plate.

4. The ringspinning system of claim 2, wherein the mounting plate has an anchoring hole, with which a clamp assembly is anchored to an anchoring rod provided in the ringspinning system.

5. The ringspinning system of claim 4, wherein the anchoring rod is arranged offset and parallel to the rotation axis of the bobbin.

6. A ringspinning system of claim 1, wherein a mounting plate has an erected portion on which a knife element is mounted, wherein the knife element is configured to cut the first filament at a point in the region of a bobbin where it is delivered from the bobbin to the drafting stage.

7. The ringspinning system of claim 6, wherein the erected portion is arranged perpendicular to the first and second clamp arm and to the mounting plate.

8. The ringspinning system of claim 1, wherein a mounting plate has a nose portion extending therefrom, which extends perpendicular to an erected portion and perpendicular to a first and second clamp arms.

9. The ringspinning system of claim 1, wherein the ringspinning system further comprises a first and second driving cylinder with which the bobbin is rotated, while an outer surface of the bobbin on which the first filament is rolled up, is rollingly driven by the first and second driving cylinders, while the bobbin is mounted between the first and second driving cylinders.

10. The ringspinning system of claim 9, wherein the erected portion is provided between the first and second driving cylinders and the first and second clamp arms are provided rearward of the first and second driving cylinders.

11. The ringspinning system of claim 1, wherein the at least one sensor is constituted by a first sensor, with which a breakage of the first filament is detected, and a second sensor, with which a breakage of the second filament is detected.

12. The ringspinning system of claim 11, wherein the second sensor is provided downstream of the first sensor.

13. The ringspinning system of claim 10, wherein the ringspinning system further comprises a pair of driving cylinders, consisting of a third and fourth driving cylinder, which pair is configured to drive the second filament when it is fed over at least one of said third and fourth driving cylinder, wherein the pair of driving cylinders, consisting of the third and fourth driving cylinder, is located downstream of the first and second driving cylinders.

14. The ringspinning system of claim 13, wherein the second driving cylinder is provided downstream of the first driving cylinder, the third driving cylinder is arranged downstream of the second driving cylinder and the fourth driving cylinder is provided downstream of the third driving cylinder, wherein the first senor is provided between the second and the third driving cylinder.

15. The ringspinning system of claim 13, wherein the second sensor is provided upstream of the drafting stage and downstream of the third and fourth driving cylinder.

16. The ringspinning system of claim 1, wherein the ringspinning system is adapted that in the case at least one of the sensors detects a breakage of the respective filament, the clamp fixes the second filament at an free end thereof such that the free end of the second filament is held between the fixing surfaces, and the knife element cuts the first filament at a location where it is delivered from the bobbin.

17. The ringspinning system of claim 1, wherein the drafting stage includes a first, second and third drafting cylinder on which the drafting of the first and second filament together is executed, wherein the second drafting cylinder is provided downstream of the first drafting cylinder, and wherein the third drafting cylinder is provided downstream of the second drafting cylinder, wherein the first, second and third drafting cylinders are arranged in one plane which is tilted approximately in the feeding direction of the first and second filaments.

18. The ringspinning system of claim 1, wherein the ringspinning system further comprises a guiding device for guiding the first and/or second filament, wherein the guiding device is mounted upstream of the drafting stage.

19. The ringspinning system of claim 18, wherein the guiding device has at least one opening through which the first and/or second filament is guided before it is or they are fed to the drafting stage.

20. The ringspinning system of claim 19, wherein the guide element has an arm having a first shank which is slanted with respect to the plane in which the first, second and third drafting cylinders are arranged and which first arm extends approximately in the direction of the extension of the first and or second filament.

21-28. (canceled)

Description

BRIEF DESCRIPTION OF THE FIGURES

[0068] Further embodiments shall be explained with reference to the Figures, in which

[0069] FIG. 1 shows one ringspinning line of an inventive ringspinning system,

[0070] FIG. 2 shows the clamp assembly of the system shown in FIG. 1,

[0071] FIG. 3 shows a magnified view on the region of the system shown in FIG. 1, where the guide element is provided,

[0072] FIG. 4 shows two adjacent guiding elements of adjacent ringspinning lines,

[0073] FIG. 5 shows an alternative constitution of adjacent guiding elements of adjacent ringspinning lines.

DETAILED DESCRIPTION

[0074] FIG. 1 schematically shows a cross-section showing one line of a ringspinning system 1.

[0075] The ringspinning system in the present case is a ringspinning system for producing a dual core yarn. Therefore, there is fed a first filament 2 and a second filament 3 to the drafting stage 4. In the drafting stage 4, the first filament 2 and the second filament 3 are drafted. Downstream of the drafting stage 4 the drafted filament which constitutes a roving is ring spun and wound up on a spindle (not shown in the Figure). Although there are presently described two filaments, the disclosure is not delimited to two filaments. There may also be fed three, four, and more than four filaments to the drafting stage 4. Moreover, the final yarn may have a cladding layer made of staple fibers. The first filament 2 in the present case is an elastic filament, while the second filament 3 is a non-elastic filament. The utilization of an elastic filament as first filament and a non-elastic filament as second filament is not essential. It may also be the case that the first filament 2 is a non-elastic filament, while the second filament 3 is an elastic filament. Also, both filaments may be elastic filaments or both filaments may be non-elastic filaments.

[0076] As elastic filament, elastane or any other elastic synthetic and non-synthetic filaments can be used. Examples are Spandex. Spandex has superior strength and durability. Spandex also has good resistance to dry heat and oil.

[0077] As non-elastic filament, the following filament having no significant elasticity may be used.

[0078] Examples are polyester, nylon (nylon 6, nylon 6,6), PBT (Polybutylenterephthalat), viscose. Also any mixture of the foregoing materials can be used.

[0079] The filament can also be partially oriented yarn (POY) or highly oriented yarn (HOY).

[0080] Partially oriented yarn is produced from the melting and extrusion (melt spinning) of the polyester chip or flake. During the spinning process the filaments are stretched or drawn as much as five times their original size to orient the polymer to meet the desired evenness, strength, shrinkage, and elongation properties. So the term partially oriented yarn refers to multi-filament that is only partially stretched. POY is generally lower tenacity and less uniform than fully oriented yarn (FOY). POY is mainly used in texturizing to make textured yarn and can also be used in draw warping for weaving and warp knitting of fabrics.

[0081] The first filament 2 is supplied from a bobbin 5. The bobbin 5 is held in a rotatable manner between a first driving cylinder 6 and a second driving cylinder 7. Only a part of the respective first driving cylinder 6 and second driving cylinder 7 is shown in FIG. 1. The respective driving cylinders 6, 7 extend in a horizontal direction of the system such that the driving cylinders 6, 7 drive different bobbins 5 which are mounted in one row one after each other, wherein each bobbin 5 is assigned to one ringspinning line.

[0082] This first and second driving cylinders 6, 7 may be actuated by an actuator (not shown) to provide a driving motion to the bobbin 5. Such a driving motion is generated, as the outer circumferential surface of the bobbin 5 is in contact with the outer circumferential surface of the first and second driving cylinder 6, 7, whereby the bobbin 5 is mounted between the first and second driving cylinder 6, 7.

[0083] When the driving cylinders 6, 7 rotate, the first filament 2 is unrolled from the bobbin 5 and supplied to the drafting stage 4. Adjacent to the bobbin 5, there is provided a clamp assembly 8.

[0084] The clamp assembly 8 is constituted by a mounting plate 9, a first clamp arm 10, a second clamp arm 11, as well as an erected portion 12.

[0085] The configuration of the first clamp arm 10, the second clamp arm 11, and the erected portion 12 shall be explained with respect to the clamp assembly 8 shown in FIG. 2 in a magnified form.

[0086] The mounting plate 9 has a plate like form and is provided in the specific example between adjacent bobbins 5 of different adjacent ringspinning lines.

[0087] In FIG. 1, there is only shown one clamp assembly 8. A plurality of arrangements shown in FIG. 1 may be arranged one after each other in a horizontal direction to provide the ringspinning system.

[0088] In the specific case shown in the figures a first clamp arm 10 is rotatably mounted to the mounting plate 9. Further, there is provided a second clamp arm 11, which rotates with respect to the first clamp arm about a rotation axis 13, which is provided offset to a bobbin axis, which is marked in FIG. 1 with reference sign R. Also, the second clamp arm 11 is rotatably mounted to the mounting plate 9. As an alternative, also one of those arms may by a unitary part with the mounting plate 9.

[0089] The respective first and second clamp arm 10, 11 has on a distal end portion thereof a first, respectively second, fixing surface 15, 16. Between the respective first and second fixing surface 15, 16, the second filament 3 is clamped in case a breakage is detected.

[0090] FIG. 2 schematically shows how the second filament is guided between the first and second fixing surfaces 15, 16.

[0091] The mounting plate 9 further has an anchoring hole 17, through which an anchoring rod 18 extends. This anchoring rod 18 (see FIG. 1) extends parallel and offset to the first and second driving cylinders 6, 7 in the horizontal direction of the respective ringspinning lines adjacent to each other. The clamp assembly 8 is mounted via this anchoring hole 17 to the anchoring rod 18.

[0092] The erected portion 12 has a knife element 19 at a location where the erected portion 12 faces the outer circumferential surface of the bobbin 5. This knife element 19 may have the form of a blade with a cutting edge. This blade is for example insert molded in the erected portion 12, which is a unitary part of the mounting plate 9.

[0093] In the present case, the mounting plate 9, the erected portion 11, and the first and second arms 10, 11 are injection molded elements made from plastic material. Nevertheless, also different materials such as a metal material may be chosen. The erected portion has a recess 20, in which the knife element 19 is provided, which knife element 19 cuts in the case that a breakage is detected the first filament 2 in the region of the bobbin 5.

[0094] A nose portion 21 extends from a front side of the mounting plate 9 which nose portion 21 has a broadened portion 22 on which the operator of the system can manually actuate the clamp assembly. The erected portion 12 extends perpendicularly to the plane of the mounting plate 9 and perpendicularly to the extension direction of the first and second clamp arms 6, 7. When a breakage is detected, the second filament 3 is fixed between the first and second fixing surface 15, 16. There may be provided one or more barbs on the fixing surfaces 15, 16 to improve the fixing force applied to the second filament.

[0095] The fixation of the second filament 3 is done simultaneously before or after the first filament 2 is cut by the knife element 19. This fixing and cutting may be electronically controlled such that the clamp assembly 8 is rotated about the anchoring rod 18 based on a signal of a controlling system which is not shown in the Figures. When the controlling system gets a signal from at least one sensor (the sensors are described in the following) concerning a breakage, the clamp assembly is actuated, such that the first filament 2 is cut by the knife element 19 and such that the second filament 3 is fixedly held between the fixing surfaces 15, 16 of the first and second clamp arms 10, 11. Such an actuation may also be provided without any computer implemented control simply by a mechanical process which is automatically started due to the fact that the pulling tension acting on the first and/or second filament, when the first and/or second filament is broken, is reduced or completely omitted.

[0096] In the present case, the ringspinning system is actuated by solenoid actuators. Such a solenoid actuator can also be used to actuate the clamp assembly 8 or only parts of the clamp assembly such as the first and second clamp arms 10, 11 and or the knife element.

[0097] For example, the second filament 3 is pulled through the fixing surfaces 15, 16 by a certain force, in case these fixing surfaces 15, 16 are clamped together. When this specific force is not provided, for example, due to breakage, the fixing surfaces 15, 16, e.g. having the barbs can fix the respective end of the second filament 3. Cutting the first filament 2 with the knife element 19 can also be implemented due to the change in the travelling direction of the first yarn after it is broken. Also further, actuation kinematics for the fixation and cutting are possible.

[0098] In the present case, there are provided two sensor elements, namely a first sensor 23 and a second sensor 24. The first sensor 23 senses the breakage of the first filament 2. For this sensor 23, any suitable sensor may be used. The first sensor having reference sign 23 is only schematically shown in FIG. 1. The first sensor 23 in the present case is mounted in the vicinity of the second driving cylinder 7.

[0099] Moreover, the system in accordance with FIG. 1 comprises a pair of further driving cylinders in the following identified as third and fourth driving cylinder 25, 26. Said driving cylinders 25, 26 pull the second filament 3 and guide the second filament to the drafting stage 4.

[0100] In the specific example, the second filament 3 travels along a lower surface of the third driving cylinder 25 into a region where the third and fourth driving cylinder 25, 26 contact each other to an upper surface of the fourth driving cylinder 26 and from there to the drafting stage 4.

[0101] The first sensor 23 is provided between the second driving cylinder 7 and the pair of driving cylinders (third and fourth driving cylinders 25, 26) which drive the second filament 3.

[0102] The second sensor 24 is mounted in the region of the third and fourth driving cylinders 25, 26 downstream of the third and fourth driving cylinder 25, 26. With the second sensor 24, a breakage of the second filament 3 is detected.

[0103] Instead of utilizing two sensors as in the specific example, a detection can also be done for both filaments by a single sensor.

[0104] However, the sensors described are not essential for the disclosure. Any sensor configuration and arrangement may be used.

[0105] The drafting stage 4 is set up of a first, second and third drafting cylinder 27, 28, 29. The first, second, and third drafting cylinders 27, 28, 29 are arranged in one plane P, which is tilted approximately extending in the feeding direction of the first and second filaments 2, 3.

[0106] When viewed from the front side shown in FIG. 1, above, the plane P of the first drafting cylinder, second drafting cylinder, and third drafting cylinder 27, 28, 29 and in a region where the respective first and second filaments 2, 3 are fed to the drafting stage 4, there is provided a so-called guiding device 30. The guiding device is for guiding at least one of the first and/or second filament 2, 3 to the drafting stage 4. In case a breakage is detected, the guiding device 30 further prevents the downstream broken end of the first and/or second filament 2, 3 to freely bounce. Such a bouncing may damage the drafting stage and/or ring or spindle which is provided downstream of the drafting stage 4.

[0107] A magnified view of the guiding device 30 is shown in FIG. 3. This guiding device 30 is constituted by an arm 31 having a general V-shape and an L-formed securing element 32. This L-formed securing element 32 has a longer shank 33 and a shorter shank 34. The longer shank 33 is mounted with a distal end thereof to a plate element extending perpendicularly to the extension direction of the first, second, and third drafting cylinders 27, 28, 29. The longer shank 33 extends in the same direction as and offset from the second and third drafting cylinder 28, 29 in a region between the second and third drafting cylinders 28, 29.

[0108] The shorter shank 34 extends perpendicularly to the plane P in which the first, second, and third drafting cylinders 27, 28, 29 are provided. On a distal end of the shorter shank 34, there is mounted a second shank 37 of the V-shaped arm 31. A first shank 36 of the V-shaped arm 31 is tilted in an arcuate angle with respect to the plane P defined by the first, second, and third drafting cylinders 27, 28, 29.

[0109] At a side face, which faces an adjacent ringspinning line, the first shank 37 has in the present case two ring elements 38, 39, namely a first ring element 38 and a second ring element 39. The first ring element 38 is provided upstream of the second ring element 39. In the present case, both the first and second filaments 2, 3 are guided through the first and second ring elements 38, 39. It may also be the case that only one of the respective filaments 2, 3 is guided to only one ring element or that only one single ring element is provided, wherein two filaments are fed through this one single ring element. Any configuration with one or more than one ring elements, wherein only one or more than one filaments are guided through the ring elements, may be provided.

[0110] The first shank 36 of the V-shaped arm 31 has an offset section 40, on which the ring elements 38, 39 are mounted. Also, the second shank 37 has a respective offset section with which the arm is mounted to the shorter shank 34 of the L-formed securing element 32. Thereby, there is provided a base section 41 in the V-shaped arm 31, which is provided offset from the respective distal ends of the first and second shank 36, 37. Such a configuration is provided in view of space requirements.

[0111] FIG. 4 shows a situation, wherein further to this guide device 30 shown in FIG. 3, a second guide device 30′ of an adjacent ringspinning line directly adjacent to the ringspinning line shown in FIG. 1 is provided.

[0112] The respective ring elements 38, 39 are provided at surfaces of the respective first shanks 36 of the first and second guiding device 30, 30′, which are facing away from each other.

[0113] FIG. 5 shows an alternative configuration of the two guiding devices 30, 30′. The offset configuration of the first shank 36 is similar. However, the arm has not a V-shape, as the V-shaped arm 31 in the other embodiments shown in the figures. Moreover, the ring element in the case of FIG. 5 is made by bent wires having on a side surface thereof an opening 42. Through this opening 42, it is easier to insert the respective first and second filaments 2, 3. Also in the case of FIG. 5, similar as in the example shown in FIG. 4, there are shown two adjacent guiding devices of adjacent ringspinning lines.

REFERENCE SIGN LIST

[0114] Ringspinning system 1 [0115] First filament 2 [0116] Second filament 3 [0117] Drafting stage 4 [0118] Bobbin 5 [0119] First driving cylinder 6 [0120] Second driving cylinder 7 [0121] Clamp assembly 8 [0122] Mouting plate 9 [0123] First clamp arm 10 [0124] Second clamp arm 11 [0125] Erected portion 12 [0126] Rotation axis 13 [0127] Bobbin axis R [0128] First fixing surface 15 [0129] Second fixing surface 16 [0130] Anchoring hole 17 [0131] Anchoring rod 18 [0132] Knife element 19 [0133] Recess 20 [0134] Nose portion 21 [0135] Broadened portion 22 [0136] First sensor 23 [0137] Second sensor 24 [0138] Third driving cylinder 25 [0139] Fourth driving cylinder 26 [0140] First drafting cylinder 27 [0141] Second drafting cylinder 28 [0142] Third drafting cylinder 29 [0143] Plane P [0144] Guiding device 30, 30′ [0145] V-shaped arm 31 [0146] L-formed securing element 32 [0147] longer shank 33 [0148] shorter shank 34 [0149] plate element 35 [0150] first shank 36 [0151] second shank 37 [0152] ring element 38, 39 [0153] offset section 40 [0154] base section 41 [0155] opening 42