EP2028300A2 - Dispositif de contrôle et de réduction des pulsations de tension dans l'alimentation d'une broche retordeuse quatre en un - Google Patents

Dispositif de contrôle et de réduction des pulsations de tension dans l'alimentation d'une broche retordeuse quatre en un Download PDF

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Publication number
EP2028300A2
EP2028300A2 EP08160624A EP08160624A EP2028300A2 EP 2028300 A2 EP2028300 A2 EP 2028300A2 EP 08160624 A EP08160624 A EP 08160624A EP 08160624 A EP08160624 A EP 08160624A EP 2028300 A2 EP2028300 A2 EP 2028300A2
Authority
EP
European Patent Office
Prior art keywords
yarn
controlling
stabilising
unwinder
twisting spindles
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.)
Withdrawn
Application number
EP08160624A
Other languages
German (de)
English (en)
Other versions
EP2028300A3 (fr
Inventor
Roberto Badiali
Fabio D'agnolo
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 EP2028300A2 publication Critical patent/EP2028300A2/fr
Publication of EP2028300A3 publication Critical patent/EP2028300A3/fr
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H7/00—Spinning or twisting arrangements
    • D01H7/02—Spinning or twisting arrangements for imparting permanent twist
    • D01H7/86—Multiple-twist arrangements, e.g. two-for-one twisting devices ; Threading of yarn; Devices in hollow spindles for imparting false twist
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/10—Tension devices
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H13/00—Other common constructional features, details or accessories
    • D01H13/10—Tension devices
    • D01H13/104—Regulating tension by devices acting on running yarn and not associated with supply or take-up devices
    • D01H13/106—Regulating tension by devices acting on running yarn and not associated with supply or take-up devices for double-twist spindle

Definitions

  • the present invention refers to a four-for-one twisting spindle for twister machines and in particular to a tension-regulating device of the yarn feeding to a four-for-one twisting spindle.
  • the twisting spindle for multiple twists of textile threads and yarns comprises a basket support 10 for a feeding bobbin 11, which is maintained locked in place by using stationary magnets M, for example.
  • the bobbin 11 is separately prepared with doubled yarns wound in a doubler machine on a package that is then brought to the twister.
  • the four-for-one twisting spindle also comprises two parts rotating in opposite directions, respectively an upper, more internal rotating part 15 and a lower rotating part 16, both arranged under the bobbin-holder basket 10, the rotating parts 15 and 16 being coaxial with each other and with respect to the spindle axis, and a transmission and unwinder element 20 arranged above the bobbin 11.
  • the yarn F that is unwound from the bobbin first passes through an unwinder element 20, which terminates with the transmission element 21 arranged above the bobbin, then descends towards the internal, upper rotating part 15, defining an inner balloon B around the bobbin.
  • the lower rotating part 16 is supported by a stationary bearing 14 that sustains the entire four-for-one twisting spindle and is driven by external motion transmission means, for example by means of a pulley 17 coaxial with the spindle which receives the rotary motion with a transmission belt.
  • the lower rotating part 16 in turn transmits the motion to the upper rotating part 15, for example through an epicycloidal transmission device 18, according to the mentioned patent application EP 1.726.693 by the same applicant, to which reference is made for more details.
  • Such epicycloidal device 18 is contained within a fixed box part 19, also held locked in place with fixed magnets mounted on the bottom of the basket 10.
  • an unwinder device 20 is comprised which receives the doubled yarn F from the bobbin 11.
  • Such unwinder 20 is mounted on the inner shaft 13 of the basket 10 with the interposition of a rolling bearing 22.
  • the entire unwinder 20 is placed in rotation by the same doubled yarn F which unwinds as a spiral from the bobbin 11, passes into the terminal ring of the rotating arm 23 and enters inside the axial cavity 24 of the unwinder 20 which re-ascends the unwinder itself up to the bell-shaped transmission 21 at its top.
  • the linear unwinding speed is determined by the draw of the collection unit placed downstream, which also determines the hourly quantity of twisted yarn production.
  • a yarn tensioning element 25 is placed inside the cavity 24.
  • this consists of an elastic piston 26 with a spring at its interior that presses the doubled yarn F against two annular seats 27 placed at the two upper and lower rounded ends of the piston 26.
  • Such tensioner 25 meets the need that both ends of the doubled yarn F arrive at the transmission 21 precisely parallel to each other and with a certain tension.
  • one of the two ends results slack and in the twisting there is a slot of projecting yarn, this would be an unacceptable defect of the twisted yarn.
  • the tensioner 25 is therefore an equaliser of the doubled yarn F in order to prevent going beyond a possible slack end present in the doubled yarns.
  • One feature of the spindle consists of the fact that the yarn, for at least one part of its course, can form free balloons B and B' that are not externally delimited.
  • the four-for-one twisting spindle receives its single drive from the axial shaft of the lower rotating part 16, for example by means of the pulley 17, and is driven for example at 10,000 rev/min.
  • the epicycloidal transmission device 18 transmits the motion to the upper rotating part 15 with a speed of about 50%: the upper part rotates in turn, for example, at 5000 rev/min.
  • the yarn F receives two twists for every revolution of each of the two rotating parts, per every minute of work the doubled yarn that passes receives 10,000 revolutions, twice, from the rotating part 16 and 5,000 revolutions, twice, from the rotating part 15, i.e. 30,000 rev/min in total. If a twisting of 600 twists per linear meter is required for the yarn F, it is thus possible to work 50 meters of yarn F per minute in the four-for-one twisting spindle, actuating the device downstream of collection with a draw of 50 m/min.
  • the yarn F is pulled away from the bobbin 11 locked in its basket, from which unwinding takes place at 50 metres per minute, for example.
  • the 50 m/min correspond to about 100 spirals wounded per minute: the yarn F rotates slowly around the bobbin with spiral progression.
  • the resistance to the unwinding and the corresponding tension of the yarn F varies depending on the drawing point of the yarn with a pulsation that corresponds to the bobbin 11 traversing: it goes from a minimum value when the yarn is drawn from the highest part of the bobbin to a maximum value when the yarn is drawn from the lower part of the bobbin 11.
  • Such pulsation is due both to the variation of the yarn section length, which extends from the bobbin drawing point to the ring of the rotating arm 23, and to the greater or lesser friction that the yarn sliding on the bobbin encounters.
  • the variation of the unwinding tension between the upper part and the lower part of the bobbin essentially depends on the fact that the yarn that is unwound in ascending or descending direction encounters different resistance from the adjoining spirals.
  • the aforesaid 50 m/min of linear speed correspond with 400 spirals unwound per minute (the limit value is 500-600): the yarn F rotates quickly around the bobbin 11, always with spiral progression and with analogous tension pulsation, and with greater frequency.
  • the unwinder 20 that draws the yarn F is driven by the drawing of the yarn itself in a rotation that is slow at first, at a speed of a few dozen rev/min, up to a faster rotation at several hundred revolutions per minute when the bobbin is finishing.
  • the unwinding resistance is progressively increasing due to the greater rotation speed to transmit to the unwound yarn spiral F that extends from the bobbin 11 to the unwinder 20.
  • Such driving in rotation is transmitted through the rotating arm 23.
  • Due to the resisting tension pulsation of the yarn F also the arm 23 and the entire unwinder 20 rotate at pulsating speed and give an amplifying effect of the resisting tension pulsation of the yarn F during its unwinding.
  • the variation of the resistance of the doubled yarn F at the drawing in fact leads to a periodic offset between the angular coordinates of the drawing point, where it is separated from the bobbin, and the rotating arm 23.
  • the pulsation of said free length leads to a pulsation of the angular drawing and pulling speed that is exerted by the arm 23 on the yarn.
  • the unwinder 20 has a certain inertia proportional to its weight and structure; it is driven in rotation by the yarn F drawn upward and that is unwound from the bobbin 11.
  • the yarn F When the drawing direction is reversed at the upper edge of the bobbin, the yarn F suddenly increases its unwinding resistance and the displacement angle between the arm 23 and the drawing point of the yarn increases: the unwinder 20 goes beyond the drawing point of the yarn and there is a positive tension peak due to the increase of angular displacement, followed by a certain release, i.e. a "negative" tension peak.
  • the yarn F decreases its unwinding resistance and the displacement angle between the arm 23 and the drawing point of the yarn decreases: the unwinder 20 has a certain inertia, but it then adapts and in the transition there is a certain release of tension due to the reduction of angular displacement.
  • the yarn F re-descends, forming the inner balloon B.
  • the progression over time of the instantaneous tension of the yarn during its re-ascending run towards the upper transmission 21 is shown as an example in the solid line TI of figure 3 , from the start to the end of the bobbin 11.
  • the progression of the average tension of the yarn is instead shown in the dashed-dotted line TM.
  • the instantaneous tension is irregularly pulsing and on average increasing from start to finish. Such overall tension is the resultant of all the forces and resistances offered by the yarn and by the system in motion from the drawing point up to the inlet of the radial duct 28.
  • the inner balloon B does not have a compensating pulley due to the space unavailability and system geometry.
  • the yarn of the inner balloon B naturally has a pulsating tension that causes instability of the balloon itself.
  • the inner balloon B continuously varies its shape and size.
  • the tension of the inner balloon B can neither be too high nor too low. Overly low tensions can cause interferences between the two balloons B and B', but the greatest danger lies in excess tension. Excess tension of the descending balloon B can reduce the winding of the reserve of the second balloon B' around the surface 36, bringing it to a condition of instability.
  • the present invention is therefore directed towards an unwinder device that permits controlling the tension progression and values of the inner balloon B at the point in which the yarn drawn from the bobbin 11 arrives at the bell-shaped transmission 21 and starts to form said balloon.
  • the present invention is directed towards a new unwinder device for four-for-one twisting spindles that permits controlling the inner balloon B and the tension value of the yarn and overcomes the drawbacks described up to now.
  • the present invention in its most general meaning of the unwinder device employed by a twister, is defined in the first claim. Its preferred variants or embodiments are defined in the dependent claims 2 - 14.
  • the yarn F is deflected downward by the drawing of the upper rotating part 15 and begins to form the inner balloon B driven into rotation at high speed, for example 5,000 rev/min.
  • the bell-shaped transmission device 21 of figures 1 and 2 is integral with the unwinder 20 that rotates at a reduced speed, from several dozen rev/min at the start of the bobbin 11 to several hundred rev/min.
  • the yarn At the outlet of the bell-shaped element 21, the yarn not only slides on the bell-shaped element with a speed of dozens of metres/min in longitudinal direction, but also rotates by sliding on the bell-shaped element itself at nearly 5,000 rev/min.
  • the unwinder device 50 is achieved according to the present description regarding its lower part, i.e. arm 23, the inner axial cavity 24 with tensioner 25 of the yarn F, which consists of an elastic piston 26 which presses the yarn against two annular seats 27 placed at the two upper and lower rounded ends of the piston 26.
  • bell-shaped deflector 51 rendered idle with respect to the unwinder 50 below.
  • the rotary independence of the bell-shaped element 51 employs a ball bearing 52, fit at the top of the body 53 that contains the axial cavity 24.
  • the external surface of the rotating bell-shaped element 51 is achieved with a moderate friction coefficient, so that the yarn F driven in rotation at the speed of the balloon B, for example at 5,000 rev/min, drives the bell-shaped element 51 therewith without the latter losing revs.
  • the yarn F In order to obtain the best results, the yarn F must be capable of driving the bell-shaped element 51 therewith without the latter losing revs.
  • the preferred friction coefficient values for the surface of the bell-shaped element 51 are in the range of 0.2 - 0.4.
  • the unwinder 50 provided with idle bell-shaped element 51 according to the present invention offers considerable advantages.
  • the progression of balloon B is shown in plan view, in its run on the upper transmission bell-shaped element, where the dashed line shows the progression of the balloon B with the rotating bell-shaped element 51 and the dotted line shows the progression of the balloon B with the fixed bell-shaped element 21, given the same conditions.
  • the inner balloon B thus does not tend to be arranged towards a tangential direction and its spiral progression is significantly limited; it does not come as close to the fixed basket 10.
  • the rotating bell-shaped element 51 permits reducing the inlet tension of the balloon itself to a significant value, allowing the balloon B to assume a more regular progression, far from the basket, such as for example indicated to the left in figure 5 .
  • the rotary sliding of the yarn against the bell-shaped element and the related wear are substantially eliminated.
  • the unwinder 50 is mounted on the inner shaft 13 of the fixed basket 10 with the interposition of a rolling bearing 22, the entire unwinder 20 being placed in rotation by the same doubled yarn F that is unwound from the fixed bobbin 11.
  • a conductive material ring 60 is placed and fixed on the upper end of the fixed shaft 13.
  • one or more permanent magnets 61 are mounted, facing, with one of their polarities N-S, at an adjustable distance from the ring 60.
  • the conductive material fixed ring 60 Due to the rotation of the magnets 61 integral with the unwinder 50, the conductive material fixed ring 60 is thus subjected to a variable magnetic field, which induces eddy currents therein that generate a magnetic field opposing the magnets 61, with braking effect on the unwinder.
  • an alternative embodiment can be composed by placing the conductive material ring 60 on the lower end of the rotating unwinder 50 and placing the magnets 61 on the upper end of the fixed shaft 13.
  • Such conductive material ring 60 can be made with a continuous ring, as shown in the detail on the right, or with a ring with holes distributed on its surface, as shown in the detail on the left.
  • the embodiment with continuous ring permits a more regular braking, but requires increased precision in the adjustment of the work distance.
  • the ring 60 is provided with a height adjustment device, so to be able to determine, at a desired value, its axial distance from the rim on which the magnets 61 lie as well as the exerted braking action.
  • the operator adjusts the braking distance at the start of the processing so as to exert a very light braking action: ring 60 and magnets 61 are kept quite far from each other.
  • the disc 60 is brought closer to the magnets 61 in order to increase the braking action, which typically increases with the decrease in distance in a quadratic relationship.
  • an adjustment device of their mutual distance is inserted on the fixed shaft 13.
  • the exemplifying embodiment of figure 6 provides - for such purpose - the use of a threaded ring nut 64 that is screwed on a thread 65 made on the upper end of the fixed shaft 13. With a 1.5 mm pitch thread, it is possible to adjust - with six 60°-spaced positions - said distance with 0.25 mm pitches. Appropriate locking means are then provided of the ring nut's angular position.
  • Such braking system results unaffected by dirt and dust, can be easily regulated, doesn't depend on the rotation speed and is unaffected by the vibrations and sliding.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • General Preparation And Processing Of Foods (AREA)
EP08160624A 2007-08-01 2008-07-17 Dispositif de contrôle et de réduction des pulsations de tension dans l'alimentation d'une broche retordeuse quatre en un Withdrawn EP2028300A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20071578 ITMI20071578A1 (it) 2007-08-01 2007-08-01 Dispositivo di controllo e riduzione del le pulsazioni di tensione nell'alimentaz ione dei fusi a quattro torsioni

Publications (2)

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EP2028300A2 true EP2028300A2 (fr) 2009-02-25
EP2028300A3 EP2028300A3 (fr) 2009-12-30

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Application Number Title Priority Date Filing Date
EP08160624A Withdrawn EP2028300A3 (fr) 2007-08-01 2008-07-17 Dispositif de contrôle et de réduction des pulsations de tension dans l'alimentation d'une broche retordeuse quatre en un

Country Status (3)

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EP (1) EP2028300A3 (fr)
CN (1) CN101358393B (fr)
IT (1) ITMI20071578A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20100274A1 (it) * 2010-02-22 2011-08-23 Savio Macchine Tessili Spa Dispositivo di autoregolazione della tensione del filo di alimentazione dei fusi a quattro torsioni

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109112685B (zh) * 2018-09-07 2019-11-12 苏州涵轩信息科技有限公司 一种球式张力器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1007773A1 (fr) 1997-06-05 2000-06-14 D'Agnolo, Armando Broche de filature a torsions multiples
EP1726693A2 (fr) 2005-05-26 2006-11-29 SAVIO MACCHINE TESSILI S.p.A. Broche à retordre à quadruple torsion pour des métiers à retordre ou similaires

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1221118B (de) * 1963-08-09 1966-07-14 Palitex Project Co Gmbh Doppeldraht-Zwirn- und Spinnspindel
JPS5943403Y2 (ja) * 1982-12-28 1984-12-22 村田機械株式会社 二重撚糸機におけるテンシヨン装置
IT1281998B1 (it) * 1996-02-05 1998-03-06 Savio Macchine Tessili Spa Dipanatore rotante regolatore di tensione per ritorcitoio a doppia torsione
JPH10168680A (ja) * 1996-12-16 1998-06-23 Murata Mach Ltd 撚糸用テンサー
EP1045053A1 (fr) * 1999-04-05 2000-10-18 Murata Kikai Kabushiki Kaisha Ailette et méthode pour l'entrainer
ITUD20020074A1 (it) * 2002-04-04 2003-10-06 Tecnotessile Societa Naz Dir I Dispositivo dipanatore-separatore di ballon per apparecchiature di torcitura/ritorcitura di filati
CN2628550Y (zh) * 2003-06-23 2004-07-28 天津宏大纺织机械有限公司 全封闭锭翼

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1007773A1 (fr) 1997-06-05 2000-06-14 D'Agnolo, Armando Broche de filature a torsions multiples
EP1726693A2 (fr) 2005-05-26 2006-11-29 SAVIO MACCHINE TESSILI S.p.A. Broche à retordre à quadruple torsion pour des métiers à retordre ou similaires

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20100274A1 (it) * 2010-02-22 2011-08-23 Savio Macchine Tessili Spa Dispositivo di autoregolazione della tensione del filo di alimentazione dei fusi a quattro torsioni
EP2366818A1 (fr) 2010-02-22 2011-09-21 Savio Macchine Tessili S.p.A. Dispositif pour régler automatiquement la tension d'alimentation de fil de broches à quatre torsions

Also Published As

Publication number Publication date
CN101358393A (zh) 2009-02-04
ITMI20071578A1 (it) 2009-02-02
EP2028300A3 (fr) 2009-12-30
CN101358393B (zh) 2011-12-14

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