EP3572565A1 - Drawing device for a web with carding roller for air spinning systems, air spinning apparatus and drawing method for a web - Google Patents
Drawing device for a web with carding roller for air spinning systems, air spinning apparatus and drawing method for a web Download PDFInfo
- Publication number
- EP3572565A1 EP3572565A1 EP19170327.1A EP19170327A EP3572565A1 EP 3572565 A1 EP3572565 A1 EP 3572565A1 EP 19170327 A EP19170327 A EP 19170327A EP 3572565 A1 EP3572565 A1 EP 3572565A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- carding machine
- web
- drawing device
- extraction
- rotation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
- D01H1/11—Spinning by false-twisting
- D01H1/115—Spinning by false-twisting using pneumatic means
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
- D01H4/30—Arrangements for separating slivers into fibres; Orienting or straightening fibres, e.g. using guide-rolls
- D01H4/32—Arrangements for separating slivers into fibres; Orienting or straightening fibres, e.g. using guide-rolls using opening rollers
Definitions
- the present invention relates to a drawing device for a web with carding machine for air spinning systems, an air spinning apparatus comprising said drawing device of a web with carding machine and a drawing method for a web with carding machine for air spinning systems thereof.
- the drawing systems used are normally formed by three or more pairs of drawing and pressure cylinders, each of which performs a partial and progressive drawing of the web.
- the last pair uses belt systems which ensures greater delicacy in fibre parallelization and drawing.
- the output fibre flow continuity is a fundamental requirement.
- the drawing systems used in air spinning devices are derived in toto from those traditionally used in ring spinning and suffer from the same shortcomings, i.e. poor parallelization efficiency at high working speed and limited maximum obtainable drawing.
- Carding machine drawing systems instead, are used in open-end spinning systems to convey the fibres from the inlet to the rotor using the mechanical action of the teeth to tear the fibres from the web and the centrifugal action due to the high rotation speed to remove impurities and short fibres from the flow of fibres which enters into the rotor.
- the continuous flow of fibres is not a fundamental requirement and nor is the presence of short or broken fibres.
- the systems with carding machine are more compact than those with rollers and above all the parallelization function of the fibres, ensured by the action of the teeth of the carding machine, is extremely effective and is not affected in any manner by the working speed or the imparted drawing amount.
- reference numeral 4 indicates a drawing device for webs 8 of textile fibres as a whole.
- the drawing device 4 comprises a feeder device 12 of a web 8 to be drawn, comprising a feeder roller 16.
- the feeder roller 16 is driven so as to rotate about a rotation pivot thereof.
- the feeder device 12 further comprises a nozzle or a mouth 20 which conveys the web 8 to be drawn towards the successive drawing processes.
- the nozzle or mouth 20 defines a passage channel 24 for the web 8 together with the feeder roller 16.
- the nozzle or mouth 20 is preferably pressed towards the feeder roller 16 so as to apply a pressure which is as a function of the input web thread count.
- the feeder roller 16 by virtue of its motorized rotation, sets in motion the web 8, which is fed at an input speed Vi.
- the drawing device 4 further comprises a carding machine 28 comprising, on its outer side wall 32, a plurality of teeth 36 arranged at a constant tangential pitch P.
- the teeth 36 are shaped so as to draw the web 8.
- the feeder roller 16 rotates and directly faces the carding machine 28 so as to feed the web to the carding machine 28 at said input speed Vi.
- the tangential pitch P between the teeth 36 of the carding machine 28 is comprised between 5 and 15 mm.
- this pitch P is particularly wide compared with the pitches of the solutions of the prior art: this reduces the complexity and cost of the carding machine 28.
- said teeth 36 have a substantially triangular shape which protrudes from the outer side wall 32 of the carding machine 28, according to a first front portion 40, which directly faces the web 8, and a second rear portion 44 which forms a vertex 48 with the first front portion 40.
- said vertex 48 has a radial height 52, measured with respect to the outer side wall 32 along a radial direction R passing through a rotation axis C of the carding machine 28, comprised between 0.5 and 2 mm.
- the first front portion 40 identifies a first angle ⁇ comprised between 5 and 10 degrees with radial direction R, passing through a rotation axis C of the carding machine 28.
- the second rear portion 44 identifies a second angle ⁇ comprised between 40 and 70 degrees with tangential direction T perpendicular to a radial direction R passing through the rotation axis C of the carding machine 28.
- the web 8 is fed by the feeder device 12, at the input speed Vi according to a direction of advancement F agreeing with a direction of rotation S of the carding machine 28.
- the carding machine 28 is driven in rotation so as to have a peripheral speed or extraction speed Ve on the teeth 36 equal to the product of the input speed Vi times the total drawing St of the web 8, so that the drawing of the web 8 takes place entirely on the carding machine 28.
- the Ve value must remain about 20% of the product of the input speed Vi times the total drawing St.
- the Ve value must remain about 10% of the product of the input speed Vi times the total drawing St.
- the Ve value must remain about 5% of the product of the input speed Vi times the total drawing St.
- Total drawing St means the ratio between the thread count of the yarn to be produced and the input web thread count.
- the drawing device 4 further comprises an extraction cylinder 56 placed downstream of the carding machine 28 and of the web 8.
- the carding machine 28 receives the web 8 from the feeder device 12 and, by rotating in the same direction as the direction of advancement F of the web 8, pulls and draws the web 8 towards the extraction cylinder 56, arranged downstream of the carding machine 28 and of the web 8 with respect to said direction of advancement F of the web 8.
- the carding machine 28 and the extraction cylinder 56 rotate in mutually opposite directions of rotation S,G.
- the extraction cylinder 56 rotates in a counter-rotating direction G with respect to the direction of rotation S of the carding machine 28.
- the extraction cylinder 56 has a specific shape.
- the extraction cylinder 56 defines an inner cavity 60 and has a perforated side wall 64, provided with a plurality of holes 68 communicating with the inner cavity 60, adapted to create a suction flow in order to facilitate the detachment of the fibres from the carding machine 28.
- the inner cavity 60 is connected to a vacuum source so as to create a suction flow through said holes 68 which facilitates the removal of the fibres from the carding machine 28.
- said holes 68 are circular holes having a diameter comprised between 1 and 3 mm.
- said holes 68 are arranged according to a matrix diagram along a pair of directions perpendicular to each other, and are spaced apart according to a first and a second pitch L1, L2.
- said first and second pitches L1, L2 are comprised between 2 and 4 mm.
- said first and second pitches L1, L2 are equal to each other.
- one of said directions of the matrix diagram is parallel to a rotation axis W of the extraction cylinder 56.
- the perforated side wall 64 of the extraction cylinder 56 has holes 68 arranged along an extraction band 72 having an axial thickness H, parallel to the rotation axis W of the extraction cylinder 56, comprised between 4 and 11 mm.
- the vertices 48 of the teeth 36 and the side wall 64 of the extraction cylinder 56 are distant by a pitch 76 comprised between 0.1 and 2 mm.
- a conveying device 80 is arranged downstream of the extraction cylinder 56 equipped with an output roller 84 which turns in idle manner and facilitates the extraction of the yarn from the extraction cylinder 56.
- a spinning apparatus for the successive operations to be performed on the yarn may be advantageously arranged downstream of the drawing device 4.
- the feeder device sends the web 8 at an advancement speed Vin through the nozzle or mouth 20.
- the advancement speed Vin of the web 8 also corresponds to the tangential rotation speed of the feeder roller 16 at its point of contact with the web itself.
- the carding machine 28 is driven in rotation, according to a direction of rotation S, in a direction agreeing with the direction of advancement F of the web 8.
- the difference in speed between the tangential or extraction speed Ve of the teeth 36 of the carding machine 28 and the advancement speed Vi of the web 8 determines the total drawing St of the web 8.
- the web 8 is then passed from the carding machine 28 to the extraction cylinder 56 which, as seen, rotates in direction of rotation G opposite to the direction of rotation S of the carding machine 28.
- the perforated extraction cylinder 56 which delimits the inner cavity 60, has a perforated side wall 64, provided with a plurality of holes 68 communicating with said inner cavity 60 and with a vacuum source.
- the removal of the fibres of the web 8 from the carding machine 28 is facilitated by virtue of the vacuum and also by the opposite rotation of the extraction cylinder 56 according to a direction of rotation W opposite to the direction of rotation S of the carding machine 28.
- the rotation speed of the extraction cylinder 56 is such that the tangential speed on the side wall 64 is approximately equal to the tangential speed of the teeth 36 of the carding machine 28.
- the fibres of the web 8 is then conveyed from the inner cavity 60 output from the extraction cylinder 56, towards the conveying device 80 and the output roller 84.
- the present invention allows overcoming the drawbacks presented in the prior art.
- the present invention allows obtaining a high-quality yarn, according to the desired thread count because fibre continuity is always ensured.
- the drawing is obtained in a single step on the carding machine, the fibres are drawn rapidly but progressively and above all continuously. The result is a homogeneous and uniform yarn free of broken fibres and/or short length.
- the solution of the present invention envisages that the carding machine rotates according to a direction of rotation agreeing with the direction of rotation of the web of fibres: in this manner, it is possible to significantly increase the working speed and drawing amount compared to the solutions of the prior art, without incurring the risk of damaging the fibres.
- the fibres of the web are drawn practically entirely on the carding machine, which for this purpose is provided with teeth which are not very dense compared to prior art solutions.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Preliminary Treatment Of Fibers (AREA)
Abstract
- a feeder device (12) of a web (8) to be drawn,
- a carding machine (28) rotating according to a direction of rotation (S) comprising, on an outer side wall thereof (32), a plurality of teeth (36) arranged with a constant tangential pitch (P), adapted to draw said web (8),
- an extraction cylinder (56) placed downstream of the carding machine (28) and of the web (8),
wherein
- the feeder device (12) comprises a feeder roller (16), facing the carding machine (28), which rotates so as to feed the web to the carding machine (28) at an input speed and according to a direction of advancement (F) concordant with respect to said direction of rotation (S) of the carding machine (28),
- wherein the carding machine is driven in rotation so as to have a peripheral speed on the teeth equal to the product of the input speed times the total drawing of the web ± 20%, so that the drawing of the web takes place practically entirely on the carding machine,
- the total drawing being the ratio between the thread count of the yarn to be produced and the input web thread count. [Fig. 1]
Description
- The present invention relates to a drawing device for a web with carding machine for air spinning systems, an air spinning apparatus comprising said drawing device of a web with carding machine and a drawing method for a web with carding machine for air spinning systems thereof.
- As known, webs with fibre length typically of 38 mm or longer and above all with fibre distribution as homogeneous as possible are required in air spinning systems. These characteristics of the upstream web allow obtaining good technical characteristics of the yarn, while the presence of short fibres significantly worsens such characteristics.
- The drawing systems used are normally formed by three or more pairs of drawing and pressure cylinders, each of which performs a partial and progressive drawing of the web. The last pair uses belt systems which ensures greater delicacy in fibre parallelization and drawing.
- The output fibre flow continuity is a fundamental requirement.
- The drawing systems used in air spinning devices are derived in toto from those traditionally used in ring spinning and suffer from the same shortcomings, i.e. poor parallelization efficiency at high working speed and limited maximum obtainable drawing.
- Carding machine drawing systems, instead, are used in open-end spinning systems to convey the fibres from the inlet to the rotor using the mechanical action of the teeth to tear the fibres from the web and the centrifugal action due to the high rotation speed to remove impurities and short fibres from the flow of fibres which enters into the rotor. In these systems, the continuous flow of fibres is not a fundamental requirement and nor is the presence of short or broken fibres. However, the systems with carding machine are more compact than those with rollers and above all the parallelization function of the fibres, ensured by the action of the teeth of the carding machine, is extremely effective and is not affected in any manner by the working speed or the imparted drawing amount.
- The need is therefore felt to solve the drawbacks and limitations mentioned above with reference to the prior art.
- Such need is met by a drawing device with carding machine according to
claim 1, by an air spinning apparatus according toclaim 20 and by a drawing method with carding machine for air spinning according to claim 21. - Further features and advantages of the present invention will be more comprehensible from the following description of preferred embodiments given by way of nonlimiting examples, in which:
-
figure 1 shows a diagrammatic view of a drawing device with carding machine according to an embodiment of the present invention; -
figures 2a-2b show enlarged views of detail II infigure 1 ; -
figure 3 is an enlarged view of detail III infigure 1 . - Elements or parts in common to the embodiments described below will be indicated using the same reference numerals.
- With reference to the aforementioned figures,
reference numeral 4 indicates a drawing device forwebs 8 of textile fibres as a whole. - In particular, the
drawing device 4 comprises afeeder device 12 of aweb 8 to be drawn, comprising afeeder roller 16. - The
feeder roller 16 is driven so as to rotate about a rotation pivot thereof. - According to a possible embodiment, the
feeder device 12 further comprises a nozzle or amouth 20 which conveys theweb 8 to be drawn towards the successive drawing processes. - The nozzle or
mouth 20 defines apassage channel 24 for theweb 8 together with thefeeder roller 16. - The nozzle or
mouth 20 is preferably pressed towards thefeeder roller 16 so as to apply a pressure which is as a function of the input web thread count. - The
feeder roller 16, by virtue of its motorized rotation, sets in motion theweb 8, which is fed at an input speed Vi. - The
drawing device 4 further comprises acarding machine 28 comprising, on itsouter side wall 32, a plurality ofteeth 36 arranged at a constant tangential pitch P. Theteeth 36 are shaped so as to draw theweb 8. - The
feeder roller 16 rotates and directly faces thecarding machine 28 so as to feed the web to thecarding machine 28 at said input speed Vi. - Preferably, the tangential pitch P between the
teeth 36 of the cardingmachine 28 is comprised between 5 and 15 mm. - As explained below, this pitch P is particularly wide compared with the pitches of the solutions of the prior art: this reduces the complexity and cost of the carding
machine 28. - Preferably, said
teeth 36 have a substantially triangular shape which protrudes from theouter side wall 32 of the cardingmachine 28, according to afirst front portion 40, which directly faces theweb 8, and a secondrear portion 44 which forms avertex 48 with thefirst front portion 40. - Preferably, said
vertex 48 has aradial height 52, measured with respect to theouter side wall 32 along a radial direction R passing through a rotation axis C of the cardingmachine 28, comprised between 0.5 and 2 mm. - According to an embodiment, the
first front portion 40 identifies a first angle β comprised between 5 and 10 degrees with radial direction R, passing through a rotation axis C of the cardingmachine 28. - According to an embodiment, the second
rear portion 44 identifies a second angle α comprised between 40 and 70 degrees with tangential direction T perpendicular to a radial direction R passing through the rotation axis C of the cardingmachine 28. - The
web 8 is fed by thefeeder device 12, at the input speed Vi according to a direction of advancement F agreeing with a direction of rotation S of the cardingmachine 28. - In this manner, the teeth of the carding
machine 28, during rotation, cling to theweb 8 and draw it according to its direction of advancement F. - This operating condition is opposite to the known solutions in which the teeth oppose the direction of advancement of the web.
- Advantageously, the carding
machine 28 is driven in rotation so as to have a peripheral speed or extraction speed Ve on theteeth 36 equal to the product of the input speed Vi times the total drawing St of theweb 8, so that the drawing of theweb 8 takes place entirely on the cardingmachine 28. - In other words: Ve = Vi x St ± 20%.
- Therefore, the Ve value must remain about 20% of the product of the input speed Vi times the total drawing St.
- Preferably, the Ve value must remain about 10% of the product of the input speed Vi times the total drawing St.
- Even more preferably, the Ve value must remain about 5% of the product of the input speed Vi times the total drawing St.
- Total drawing St means the ratio between the thread count of the yarn to be produced and the input web thread count.
- The
drawing device 4 further comprises anextraction cylinder 56 placed downstream of the cardingmachine 28 and of theweb 8. - In other words, the carding
machine 28 receives theweb 8 from thefeeder device 12 and, by rotating in the same direction as the direction of advancement F of theweb 8, pulls and draws theweb 8 towards theextraction cylinder 56, arranged downstream of the cardingmachine 28 and of theweb 8 with respect to said direction of advancement F of theweb 8. - It is worth noting that the carding
machine 28 and theextraction cylinder 56 rotate in mutually opposite directions of rotation S,G. In particular, theextraction cylinder 56 rotates in a counter-rotating direction G with respect to the direction of rotation S of the cardingmachine 28. - The successive removal of the fibres of the
web 8 is facilitated and improved by virtue of the counterpoised rotations of the cardingmachine 28 and of theextraction cylinder 56. - For this purpose, the
extraction cylinder 56 has a specific shape. - In particular, the
extraction cylinder 56 defines aninner cavity 60 and has a perforatedside wall 64, provided with a plurality ofholes 68 communicating with theinner cavity 60, adapted to create a suction flow in order to facilitate the detachment of the fibres from the cardingmachine 28. In particular, theinner cavity 60 is connected to a vacuum source so as to create a suction flow through saidholes 68 which facilitates the removal of the fibres from the cardingmachine 28. - It is apparent that the opposite rotation between carding
machine 28 andextraction roller 56 further facilitates such detachment of the fibres of theweb 8 from the cardingmachine 28. - For this purpose, said
holes 68 are circular holes having a diameter comprised between 1 and 3 mm. - According to an embodiment, said
holes 68 are arranged according to a matrix diagram along a pair of directions perpendicular to each other, and are spaced apart according to a first and a second pitch L1, L2. - Preferably, said first and second pitches L1, L2 are comprised between 2 and 4 mm.
- Preferably, said first and second pitches L1, L2 are equal to each other.
- According to a possible embodiment, one of said directions of the matrix diagram is parallel to a rotation axis W of the
extraction cylinder 56. - Obviously, the rotation axes W, C of the
extraction cylinder 56 and the cardingmachine 28 are respectively parallel to each other. - Generally, the
perforated side wall 64 of theextraction cylinder 56 hasholes 68 arranged along anextraction band 72 having an axial thickness H, parallel to the rotation axis W of theextraction cylinder 56, comprised between 4 and 11 mm. - In relation to the relative arrangement of carding
machine 28 andextraction cylinder 56, preferably with respect to a direction Q joining the rotation axes C, W of the cardingmachine 28 and of theextraction cylinder 56, thevertices 48 of theteeth 36 and theside wall 64 of theextraction cylinder 56 are distant by apitch 76 comprised between 0.1 and 2 mm. - A conveying
device 80 is arranged downstream of theextraction cylinder 56 equipped with anoutput roller 84 which turns in idle manner and facilitates the extraction of the yarn from theextraction cylinder 56. - A spinning apparatus for the successive operations to be performed on the yarn may be advantageously arranged downstream of the
drawing device 4. - The operation of the drawing device according to the invention will now be described.
- In particular, as mentioned, the feeder device sends the
web 8 at an advancement speed Vin through the nozzle ormouth 20. The advancement speed Vin of theweb 8 also corresponds to the tangential rotation speed of thefeeder roller 16 at its point of contact with the web itself. - So, the carding
machine 28 is driven in rotation, according to a direction of rotation S, in a direction agreeing with the direction of advancement F of theweb 8. - The difference in speed between the tangential or extraction speed Ve of the
teeth 36 of the cardingmachine 28 and the advancement speed Vi of theweb 8 determines the total drawing St of theweb 8. - Moreover, the
web 8 is then passed from the cardingmachine 28 to theextraction cylinder 56 which, as seen, rotates in direction of rotation G opposite to the direction of rotation S of the cardingmachine 28. - The
perforated extraction cylinder 56, which delimits theinner cavity 60, has a perforatedside wall 64, provided with a plurality ofholes 68 communicating with saidinner cavity 60 and with a vacuum source. - The removal of the fibres of the
web 8 from the cardingmachine 28 is facilitated by virtue of the vacuum and also by the opposite rotation of theextraction cylinder 56 according to a direction of rotation W opposite to the direction of rotation S of the cardingmachine 28. - The rotation speed of the
extraction cylinder 56 is such that the tangential speed on theside wall 64 is approximately equal to the tangential speed of theteeth 36 of the cardingmachine 28. - The fibres of the
web 8 is then conveyed from theinner cavity 60 output from theextraction cylinder 56, towards the conveyingdevice 80 and theoutput roller 84. - As can be appreciated from the description above, the present invention allows overcoming the drawbacks presented in the prior art.
- The use of the carding machine in the conditions and manner described in the present patent ensures a "soft" manipulation of the fibres, minimizing the possibility of breakage thereof and ensuring the continuity of the fibres at the input of the subsequent spinning units.
- This condition of continuity and the reduced presence of short fibres can be obtained by virtue of the operating condition of the present invention according to which the carding machine works at a linear speed equal to the product of the web input speed times the total drawing of the web ± 20%.
- As long as the linear speed value is within 20% of such a value, yarn continuity is obtained, with fibres of longer length and with a minimum risk of breakage thereof.
- Advantageously, the present invention allows obtaining a high-quality yarn, according to the desired thread count because fibre continuity is always ensured. In other words, although the drawing is obtained in a single step on the carding machine, the fibres are drawn rapidly but progressively and above all continuously. The result is a homogeneous and uniform yarn free of broken fibres and/or short length.
- Advantageously, the solution of the present invention envisages that the carding machine rotates according to a direction of rotation agreeing with the direction of rotation of the web of fibres: in this manner, it is possible to significantly increase the working speed and drawing amount compared to the solutions of the prior art, without incurring the risk of damaging the fibres.
- Advantageously, the fibres of the web are drawn practically entirely on the carding machine, which for this purpose is provided with teeth which are not very dense compared to prior art solutions.
- This reduces the production costs of the carding machine itself. Furthermore, the fibres are less stressed and can be drawn in a more progressive manner than in the solutions of the prior art.
- This therefore strongly limits the risk of obtaining broken and thus "short" fibres due to the excessively abrupt mechanical action of the teeth of the carding machine.
- Moreover, by virtue of the fact that the entire drawing action is performed by the carding machine, it is possible to reduce the overall dimensions and the overall costs of the drawing device.
- A person skilled in the art can make numerous changes and variants to the drawing devices and drawing methods of the present invention, all contained within the scope of protection defined by the following claims in order to satisfy contingent, specific needs.
Claims (22)
- Drawing device (4) for webs (8) of textile fibres comprising- a feeder device (12) of a web (8) to be drawn,- a carding machine (28) rotating according to a direction of rotation (S) comprising, on an outer side wall thereof (32), a plurality of teeth (36) arranged with a constant tangential pitch (P), suitable to draw said web (8),- an extraction cylinder (56) placed downstream of the carding machine (28) and of the web (8),wherein- the feeder device (12) comprises a feeder roller (16), facing the carding machine (28), which rotates so as to feed the web to the carding machine (28) at an input speed and according to a direction of advancement (F) concordant with respect to said direction of rotation (S) of the carding machine (28),- wherein the carding machine (28) is driven in rotation so as to have a peripheral speed on the teeth equal to the product of the input speed for the total drawing of the web ± 20%, so that all the drawing of the web takes place substantially between the carding machine (28) and the feed roller (16),- the total drawing being the ratio between the thread count of the yarn to be produced and the thread count of the web in input.
- Drawing device (4) according to claim 1, wherein the carding machine (28) is driven in rotation so as to have a peripheral speed on the teeth or extraction speed equal to the product of the input speed for the total drawing of the web ± 10%.
- Drawing device (4) according to claim 1 or 2, wherein the carding machine (28) is driven in rotation so as to have a peripheral speed on the teeth or extraction speed equal to the product of the input speed for the total drawing of the web ± 5%.
- Drawing device (4) according to any of the preceding claims, wherein said tangential pitch (P) between the teeth (36) of the carding machine (28) is between 5 and 15 mm.
- Drawing device (4) according to any of the claims from 1 to 4, wherein said teeth (36) have a substantially triangular shape which protrudes from the outer side wall (32) of the carding machine (28), in a first front portion (40), which directly faces the web (8), and a second back portion (44) which forms a vertex (48) with the first front portion (40).
- Drawing device (4) according to claim 5, wherein said vertex (48) has a radial height (52), measured with respect to the outer side wall (32) along a radial direction (R) passing through a rotation axis (C) of the carding machine (28), between 0.5 and 2 mm.
- Drawing device (4) according to claim 5 or 6, wherein the first front portion (40) identifies with a radial direction (R), passing through a rotation axis (C) of the carding machine (28), a first angle (B) between 5 and 10 degrees.
- Drawing device (4) according to any of the claims from 5 to 7, wherein the second rear portion (44) identifies with a tangential direction (T), perpendicular to a radial direction (R) passing through a rotation axis (C) of the carding machine (28), a second angle (A) between 40 and 70 degrees.
- Drawing device (4) according to any of the claims from 5 to 8, wherein with respect to a direction (Q) joining the rotation axes (C, W) of the carding machine (28) and of the extraction cylinder (56), the vertices (48) of the teeth (36) and a side wall (64) of the extraction cylinder (56) are distant by a pitch (76) of between 0.1 and 2 mm.
- Drawing device (4) according to any of the preceding claims, wherein the extraction cylinder (56) delimits an inner cavity (60) fluidically connected to a vacuum source and has a perforated side wall (64), provided with a plurality of holes (68) communicating with the inner cavity (60), suitable for detaching the fibres from the carding machine.
- Drawing device (4) according to claim 10, wherein said holes (68) are circular holes having a diameter between 1 and 3 mm.
- Drawing device (4) according to claim 10 or 11, wherein said holes (68) are arranged according to a matrix diagram along a pair of directions perpendicular to each other, and are spaced apart according to a first and a second pitch (L1, L2).
- Drawing device (4) according to claim 12, wherein said first and second pitches (L1, L2) are comprised between 2 and 4 mm.
- Drawing device (4) according to claim 12 or 13, wherein said first and second pitches (L1, L2) are the same as each other.
- Drawing device (4) according to any one of the claims from 1 to 14, wherein the carding machine (28) and the extraction cylinder (56) rotate in directions of rotation (S, W) opposite to each other.
- Drawing device (4) according to any one of the preceding claims, wherein downstream of the extraction cylinder (56) a conveying device is arranged (80) equipped with an output roller (84) which idles and facilitates the extraction of the yarn from the extraction cylinder (56).
- Drawing device (4) according to claim 16, wherein the extraction cylinder identifies, on its own outer side wall, an extraction arc extending from an extraction starting point, in which the web is pinched between the extraction cylinder and the carding machine, to an extraction end point, in which the web is pinched between the extraction cylinder and the output roller.
- Drawing device (4) according to claim 17, wherein said extraction arc is in fluidic connection with an internal cavity (60) of the extraction cylinder fluidically connected to a vacuum source to facilitate detachment of the fibres from the carding machine.
- Drawing device (4) according to claim 17 or 18, wherein said extraction arc has an extension comprised between 0.7 and 1.5 times the average length of the fibres of the web extracted from the carding machine.
- Air spinning apparatus comprising at least one drawing device (4) according to any one of the claims from 1 to 19 and at least one air spinning device.
- Method of drawing a textile fibre web comprising the steps of:- providing a feeder device (12) of a web (8) to be drawn,- providing a carding machine (28) comprising, on an outer side wall thereof (32), a plurality of teeth (36) arranged at a constant tangential pitch (P), suitable for drawing said web (8),- preparing an extraction cylinder (56) placed downstream of the carding machine (28) and of the web (8),- providing the feeder device (12) with a feed roller (16), facing the carding machine (28), which rotates so as to feed the web to the carding machine (28) at an input speed and according to a direction of advancement (F) concordant with respect to said rotation direction (S) of the carding machine (28),- driving the carding machine (28) in rotation so as to have a peripheral speed on the teeth or extraction speed equal to the product of the input speed for the total drawing of the web ± 20%, so that all the drawing of the web takes place on the carding machine,- the total drawing being the ratio between the thread count of the yarn to be produced and the thread count of the web in input.
- Drawing method according to claim 21, comprising the step of providing a drawing device (4) according to any of the claims from 1 to 19.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102018000005659A IT201800005659A1 (en) | 2018-05-24 | 2018-05-24 | RIBBON IRONING DEVICE WITH CARDINATION FOR AIR SPINNING SYSTEMS, AIR SPINNING APPARATUS AND RELATIVE METHOD OF IRONING A BELT WITH CARDINE FOR AIR SPINNING SYSTEMS |
Publications (1)
Publication Number | Publication Date |
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EP3572565A1 true EP3572565A1 (en) | 2019-11-27 |
Family
ID=63244831
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19170327.1A Pending EP3572565A1 (en) | 2018-05-24 | 2019-04-18 | Drawing device for a web with carding roller for air spinning systems, air spinning apparatus and drawing method for a web |
Country Status (3)
Country | Link |
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EP (1) | EP3572565A1 (en) |
CN (2) | CN210438869U (en) |
IT (1) | IT201800005659A1 (en) |
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IT201800005659A1 (en) * | 2018-05-24 | 2019-11-24 | RIBBON IRONING DEVICE WITH CARDINATION FOR AIR SPINNING SYSTEMS, AIR SPINNING APPARATUS AND RELATIVE METHOD OF IRONING A BELT WITH CARDINE FOR AIR SPINNING SYSTEMS |
Citations (6)
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DE19608828A1 (en) * | 1996-03-07 | 1997-09-18 | Fritz Stahlecker | Open end spinner fibre separation roller |
US5778653A (en) * | 1996-03-07 | 1998-07-14 | Fritz Stahlecker | Suction roller for an open-end spinning machine |
WO2001079595A1 (en) * | 2000-04-14 | 2001-10-25 | Maschinenfabrik Rieter Ag | Method and device for producing a yarn with ring-spun characteristics |
DE10063729A1 (en) * | 2000-12-13 | 2002-06-27 | Fritz Stahlecker | Spinning assembly has a feed of separated sliver fibers to a gathering surface as a thin web, with tapering side edges at the suction opening to give a condensed fiber strand to be passed through a twisting jet for the spun yarn |
US20030041587A1 (en) * | 2001-08-30 | 2003-03-06 | W. Schlafhorst Ag & Co. | Opening arrangement for an open-end spinning frame |
WO2017075675A1 (en) * | 2015-11-06 | 2017-05-11 | Bahova Olga Kirilova | Method and apparatus for production of staple fiber yarn in a single process |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH706658A1 (en) * | 2012-06-29 | 2013-12-31 | Rieter Ag Maschf | Method and apparatus for controlling the supply of fiber to a carding machine. |
IT201800005659A1 (en) * | 2018-05-24 | 2019-11-24 | RIBBON IRONING DEVICE WITH CARDINATION FOR AIR SPINNING SYSTEMS, AIR SPINNING APPARATUS AND RELATIVE METHOD OF IRONING A BELT WITH CARDINE FOR AIR SPINNING SYSTEMS |
-
2018
- 2018-05-24 IT IT102018000005659A patent/IT201800005659A1/en unknown
-
2019
- 2019-04-18 EP EP19170327.1A patent/EP3572565A1/en active Pending
- 2019-05-23 CN CN201920749183.5U patent/CN210438869U/en active Active
- 2019-05-23 CN CN201910433852.2A patent/CN110528125A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19608828A1 (en) * | 1996-03-07 | 1997-09-18 | Fritz Stahlecker | Open end spinner fibre separation roller |
US5778653A (en) * | 1996-03-07 | 1998-07-14 | Fritz Stahlecker | Suction roller for an open-end spinning machine |
WO2001079595A1 (en) * | 2000-04-14 | 2001-10-25 | Maschinenfabrik Rieter Ag | Method and device for producing a yarn with ring-spun characteristics |
DE10063729A1 (en) * | 2000-12-13 | 2002-06-27 | Fritz Stahlecker | Spinning assembly has a feed of separated sliver fibers to a gathering surface as a thin web, with tapering side edges at the suction opening to give a condensed fiber strand to be passed through a twisting jet for the spun yarn |
US20030041587A1 (en) * | 2001-08-30 | 2003-03-06 | W. Schlafhorst Ag & Co. | Opening arrangement for an open-end spinning frame |
WO2017075675A1 (en) * | 2015-11-06 | 2017-05-11 | Bahova Olga Kirilova | Method and apparatus for production of staple fiber yarn in a single process |
Also Published As
Publication number | Publication date |
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CN210438869U (en) | 2020-05-01 |
IT201800005659A1 (en) | 2019-11-24 |
CN110528125A (en) | 2019-12-03 |
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