EP4249652A1 - Vorrichtung zum verdichten von faserband, spinnkopf mit einer solchen vorrichtung und spinnmaschine mit einem solchen spinnkopf - Google Patents

Vorrichtung zum verdichten von faserband, spinnkopf mit einer solchen vorrichtung und spinnmaschine mit einem solchen spinnkopf Download PDF

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Publication number
EP4249652A1
EP4249652A1 EP23158035.8A EP23158035A EP4249652A1 EP 4249652 A1 EP4249652 A1 EP 4249652A1 EP 23158035 A EP23158035 A EP 23158035A EP 4249652 A1 EP4249652 A1 EP 4249652A1
Authority
EP
European Patent Office
Prior art keywords
condenser device
sliding
passage groove
condenser
mouth
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
Application number
EP23158035.8A
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English (en)
French (fr)
Inventor
Luca DEOTTO
Luca DE VECCHI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Savio Macchine Tessili SpA
Original Assignee
Savio Macchine Tessili SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Savio Macchine Tessili SpA filed Critical Savio Macchine Tessili SpA
Publication of EP4249652A1 publication Critical patent/EP4249652A1/de
Pending legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/12—Stretch-spinning methods
    • D01D5/16—Stretch-spinning methods using rollers, or like mechanical devices, e.g. snubbing pins
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D4/00—Spinnerette packs; Cleaning thereof
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/70—Constructional features of drafting elements
    • D01H5/72—Fibre-condensing guides

Definitions

  • the present invention relates to a condenser device for fibre ribbon, a spinning head comprising such a device, and a spinning machine comprising such a spinning head.
  • the fibres forming the ribbon which are parallelised and regularised by the stretching device, must be suitably conveyed and directed within a predefined linear path that coincides with the main spinning direction. Furthermore, to prevent the ribbon from being excessively thinned due to the crushing caused by the stretching rollers, with the consequent risk of separation, bending, curling and/or overlapping of the lateral fibres with respect to the central ones, it is essential that the fibres are collected and condensed in an orderly manner on one side, compressed in width in an area as narrow as possible on the other side, to limit the twisting defects in the subsequent spinning step.
  • condensers which for the reasons already mentioned play a fundamental role in preserving the regularity and uniformity of the ribbon.
  • the condensers belonging to the prior art have a closed section of tapered shape and converging in the advancement direction of the ribbon, so as to favour a gradual collection of the fibres.
  • they are affected by multiple technical drawbacks of different nature, firstly all the poor ability to control the ribbon in the stopping and restarting steps of the spinning.
  • axes contiguous pairs of stretching cylinders
  • the two axes should theoretically stop at the same time so as not to induce over-strain or under-strain in the ribbon, but in fact this is practically impossible, because the axes are generally driven by electric stepper motors without angular position transducers, without there being any concrete possibility of carrying out a feedback check.
  • the stretching axes come to a stop at different times and consequently the ribbon undergoes a significant swelling at the inlet to the condenser, in particular on the sides (see figure 1 ) and towards the outside of the machine (see figure 2 ).
  • Such a phenomenon is further accentuated by the fact that the closed section of the condenser prevents the ribbon from any possibility of accommodation and self-adjustment of the transverse area thereof.
  • the swelling of the ribbon can also occur when the spinning starts, in the particular case in which the spinning head produces fine thread counts. In such a case, to facilitate restarting, it is customary to initially reduce the stretching ratio to increase the amount of fibres introduced into the spinning unit. Also in this condition, if the condenser is not suitably sized, ribbon clogging occurs.
  • the closed section of the condenser generates further process disadvantages: in fact, the ribbon is pushed and pressed forcefully against the walls of the condenser, giving rise to localised wear phenomena.
  • the traditional condensers are typically provided with a pair of steel plugs at the outlet section (shown in figure 1 and figure 3 ), designed to intercept the ribbon and at the same time prevent the abrasion of the plastic body.
  • This additional equipment increases the complexity of the construction of the condenser, especially due to the need to create the component in two separate pieces to be joined later, or to have to embed the pins in the plastic body.
  • the closed section does not allow the operator to monitor the evolution of the ribbon in that point, such as the occurrence of irregularities, clogging, tangles, etc.
  • a further drawback of the traditional condensers is the lack of flexibility thereof in varying the type of fibre and the thread count of the ribbon.
  • the inlet and outlet sections of the condenser must be compatible with the respective thread counts (and therefore with the corresponding volumetric material flow rates) of the ribbon which enters and exits the condenser.
  • the transverse passage section of the ribbon is in fact always closed, because the condenser is applied in direct proximity to the stretching belt, with the consequent risks already mentioned in terms of clogging and blocking the ribbon in stopping and restarting.
  • Patent GB705039 describes a condenser which performs a crushing and rolling action of the ribbon by means of a ball which is rolled by the advancement motion of the ribbon itself.
  • the main disadvantage of this device is the mechanical stress to which the ribbon is subjected, which can affect the regularity and quality thereof.
  • reference numeral 12 shows a condenser device for at least one fibre ribbon 14 for spinning head 16 according to a possible embodiment of the present invention.
  • the condenser device 12 comprises at least one passage groove 18, 19 for the fibre ribbon 14, arranged with a mouth 20 and an outlet 22 for the fibre ribbon 14, and a sliding surface 24 comprised between the mouth 20 and the outlet 22.
  • the sliding surface 24 converges from the mouth 20 towards the outlet 22.
  • the sliding surface 24 is arranged with a sliding bottom 26 and sliding side walls 28, 30 diverging from each other in the opposite direction with respect to the sliding bottom 26.
  • the condenser device 12 can comprise a radial opening 31 substantially opposite with respect to the sliding bottom 26.
  • the section trace 26 of the at least one passage groove 18, 19 in a section plane 28 substantially perpendicular to the sliding direction X at the inlet to the mouth 20 is open.
  • sliding direction X at the inlet to the mouth 20 of the condenser device 12 means the theoretical direction along which the ribbon 14 is guided near the mouth 20.
  • such a sliding direction X does not necessarily coincide with the direction of each fibre of the ribbon 14, being an overall sliding direction of the ribbon 14.
  • the section trace 26 of the sliding surface 24 comprising the sliding bottom 27 and the sliding side walls 28, 29 comprises diverging arms 30, 32.
  • the section trace 26 of the at least one passage groove 18, 19 according to each section plane perpendicular 28 to the sliding direction X are open and have diverging arms 30, 32.
  • the entire passage groove 18, 19 is open, which is why the fibre ribbon 14 can be inserted into the passage groove 18, 19, for example according to a direction substantially perpendicular to the sliding direction X.
  • the condenser device can comprise two side-by-side passage grooves 18, 19, as seen in the example of figure 13 .
  • the condenser device 12 can comprise more than two passage grooves.
  • the section trace 26 of the at least one passage groove 18, 19 in a section plane perpendicular 28 to the sliding direction X can be substantially V-shaped, or U-shaped with diverging arms 30, 32.
  • the diverging arms 30, 32 can define an angle ⁇ comprised between 40° and 70°, and preferably around 57°.
  • the section trace of the at least one passage groove 18, 19 according to a plane containing the sliding direction X and perpendicular to a centreline plane 38 containing the direction X can be substantially V-shaped, or U-shaped with converging arms 34, 36 according to the sliding direction itself.
  • the converging arms 34, 36 define an angle ⁇ comprised between 20° and 60°, and preferably around 40°.
  • the passage groove 18, 19 can be V-shaped (or U-shaped with diverging arms) in both a vertical and a horizontal plane.
  • the passage groove 18, 19 can be a side surface portion of a pyramid.
  • Such a pyramidal surface can comprise for example at least two faces 40, 42, 44, and preferably, the side surface portion of a pyramid can comprise three faces 40, 42, 44.
  • the passage groove 18, 19 can comprise an apical surface portion 46 close to or comprising the vertex of the side surface portion of the pyramid.
  • the passage groove 18, 19 can comprise an apex portion or a portion very close to the apex of the pyramid with which the passage groove 18, 19 is geometrically constructed.
  • the passage groove 18, 19 can be a conical surface portion.
  • the passage groove 18, 19 can comprise an apical surface portion 46 close to or comprising the vertex of the conical surface.
  • the passage groove 18, 19 can comprise an apex portion or a portion very close to the apex of the cone with which the passage groove 18, 19 is geometrically constructed.
  • the sliding bottom 27 of the passage groove 18, 19 can be inclined by an angle ⁇ comprised between 0° and 10°, and preferably around 5°, with respect to the sliding direction X.
  • the sliding bottom 27 can be inclined to achieve the convergence of the passage groove 18, 19 from the inlet section 20 to the outlet section 22.
  • the passage groove 18, 19 can be symmetrical with respect to a centreline plane 38 containing the sliding direction X.
  • the passage groove 18, 19 can be asymmetrical with respect to a centreline plane 38 containing the sliding direction X.
  • the length 52 of the passage groove 18, 19 in the sliding direction X can be comprised between 10 mm and 20 mm, and preferably around 15 mm.
  • the depth 54 of the passage groove 18, 19 in a plane perpendicular to the sliding direction X, at the outlet section 22 can be comprised between 8 mm and 18 mm, and preferably around 13 mm.
  • edges and/or the vertex of the sliding groove are provided with fittings of radius r comprised between 0 mm and 1.5 mm, and preferably around 0.5 mm.
  • the present invention further relates to a spinning head 16 comprising a condenser device 12 as just described, and a spinning machine 48 comprising at least one spinning head 16.
  • the condenser device is capable of condensing the fibre ribbon along two directions, giving the fibre ribbon the possibility to freely expand the transverse section thereof on the sides and frontally as a function of the operating conditions of the spinning head, without creating clogging and/or fibre blocks at the inlet of the condenser itself.
  • the tapered double V or double U shape together with the fact that the ribbon converges progressively towards the vertex and therefore towards gradually decreasing passage sections, allows the fibre ribbon to condense when needed and to disperse when it is not necessary, as well as to accompany it firmly even in the presence of defects and/or anomalies.
  • the pyramidal or conical shape allows a better collection and condensation of the fibres, in a theoretically point-like area at the outlet, with consequent limiting of the twisting defects during the spinning step.
  • the converging V or U shape with diverging arms better guides the fibres, preventing the peripheral ones on the sides from undesirably winding around the idle cylinders; this helps to improve the reliability, performance and cleanliness of the spinning head.
  • the condenser can be applied to multiple-feed spinning machines.
  • the open and convex section completely eliminates the manual threading operation of the ribbon during the initial preparation step of the machine.
  • the open section allows the operator to monitor the state of the fibre ribbon inside the condenser, so as to visually detect any tangling or unwanted accumulations, etc.
  • the open section permanently eliminates the problem of wear caused by the fibre ribbon.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP23158035.8A 2022-03-10 2023-02-22 Vorrichtung zum verdichten von faserband, spinnkopf mit einer solchen vorrichtung und spinnmaschine mit einem solchen spinnkopf Pending EP4249652A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102022000004619A IT202200004619A1 (it) 2022-03-10 2022-03-10 Dispositivo condensatore per nastro di fibre, testa di filatura comprendente tale dispositivo, e filatoio comprendente tale testa di filatura

Publications (1)

Publication Number Publication Date
EP4249652A1 true EP4249652A1 (de) 2023-09-27

Family

ID=81749506

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23158035.8A Pending EP4249652A1 (de) 2022-03-10 2023-02-22 Vorrichtung zum verdichten von faserband, spinnkopf mit einer solchen vorrichtung und spinnmaschine mit einem solchen spinnkopf

Country Status (3)

Country Link
EP (1) EP4249652A1 (de)
CN (2) CN219824479U (de)
IT (1) IT202200004619A1 (de)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2202755A (en) * 1938-01-20 1940-05-28 Mechanism for drawing textile
US2272787A (en) 1940-11-13 1942-02-10 Swift Mfg Company Drafting apparatus for textile rovings
GB705039A (en) 1951-11-28 1954-03-03 St John S Textile Mills Ltd Condenser for textile drawing machinery
US2774995A (en) 1951-10-26 1956-12-25 Warner Swasey Co High reduction fiber drafting
US2813307A (en) 1952-05-16 1957-11-19 Warner Swasey Co Drafting head
GB1131069A (en) 1964-12-17 1968-10-23 Walter Wegener Appraratus for controlling the cross sectional area of slivers in drawing
EP0424965A1 (de) 1989-10-27 1991-05-02 Ethyl Corporation Verfahren zur Herstellung von Aminoxiden
DE4024474A1 (de) 1990-08-02 1992-02-06 Schlafhorst & Co W Luntenfuehrungskanal einer spinnvorrichtung
JP2009030180A (ja) 2007-07-24 2009-02-12 Murata Mach Ltd ドラフト装置のコンデンサ、及び紡績機
EP3489400A1 (de) 2017-11-22 2019-05-29 Rotorcraft AG Verdichter für ein streckwerk

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2202755A (en) * 1938-01-20 1940-05-28 Mechanism for drawing textile
US2272787A (en) 1940-11-13 1942-02-10 Swift Mfg Company Drafting apparatus for textile rovings
US2774995A (en) 1951-10-26 1956-12-25 Warner Swasey Co High reduction fiber drafting
GB705039A (en) 1951-11-28 1954-03-03 St John S Textile Mills Ltd Condenser for textile drawing machinery
US2813307A (en) 1952-05-16 1957-11-19 Warner Swasey Co Drafting head
GB1131069A (en) 1964-12-17 1968-10-23 Walter Wegener Appraratus for controlling the cross sectional area of slivers in drawing
EP0424965A1 (de) 1989-10-27 1991-05-02 Ethyl Corporation Verfahren zur Herstellung von Aminoxiden
DE4024474A1 (de) 1990-08-02 1992-02-06 Schlafhorst & Co W Luntenfuehrungskanal einer spinnvorrichtung
JP2009030180A (ja) 2007-07-24 2009-02-12 Murata Mach Ltd ドラフト装置のコンデンサ、及び紡績機
EP3489400A1 (de) 2017-11-22 2019-05-29 Rotorcraft AG Verdichter für ein streckwerk

Also Published As

Publication number Publication date
CN116732657A (zh) 2023-09-12
IT202200004619A1 (it) 2023-09-10
CN219824479U (zh) 2023-10-13

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