EP2006427A2 - Vorrichtung zum Konzentrieren von Faserbündeln für eine Spinnmaschine - Google Patents

Vorrichtung zum Konzentrieren von Faserbündeln für eine Spinnmaschine Download PDF

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Publication number
EP2006427A2
EP2006427A2 EP08157271A EP08157271A EP2006427A2 EP 2006427 A2 EP2006427 A2 EP 2006427A2 EP 08157271 A EP08157271 A EP 08157271A EP 08157271 A EP08157271 A EP 08157271A EP 2006427 A2 EP2006427 A2 EP 2006427A2
Authority
EP
European Patent Office
Prior art keywords
fiber bundle
guide
portions
guide member
pair
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Withdrawn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
EP08157271A
Other languages
English (en)
French (fr)
Other versions
EP2006427A3 (de
Inventor
Naoki Maruyama
Koji Maeda
Kazuo Seiki
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.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
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 Toyota Industries Corp filed Critical Toyota Industries Corp
Publication of EP2006427A2 publication Critical patent/EP2006427A2/de
Publication of EP2006427A3 publication Critical patent/EP2006427A3/de
Withdrawn legal-status Critical Current

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Classifications

    • 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 fiber bundle concentrating apparatus for a spinning machine, and in particular, to a fiber bundle concentrating apparatus which is placed downstream from the draft device (draft part) of a ring spinning machine and appropriate for concentrating a fiber bundle that has been drafted by the draft device.
  • Various types of fiber bundle concentrating apparatuses for concentrating a fiber bundle that has been drafted in advance, before twisting, for the purpose of gaining high quality thread having little unevenness and little fluff have been proposed for ring spinning machines.
  • a method for concentrating a fiber bundle a method using a mechanical guide (collector), and a method for making an air flow for suction act on a fiber bundle moving on a perforated belt (ventilation apron) are generally used.
  • the guides and guide members for example the perforated belt, which are used in these methods, guide the fiber bundle while contacting the fiber bundle. Measures for reducing friction on the surface of the guide member are necessary in order to guide the fiber bundle without disturbing fibers aligned in the fiber bundle, and it is necessary to prevent this effect of reducing friction from weakening over time.
  • Japanese Laid-Open Patent Publication No. 2007-9391 discloses a fiber bundle guiding apparatus for guiding a fiber bundle without contacting the fiber bundle in order to prevent friction on the guide surface of the guide member.
  • the fiber bundle guiding apparatus in this publication is provided with a guide member having a pair of guide surfaces for guiding the fiber bundle moving in an advancing direction in such a manner that the width of the fiber bundle becomes narrower, and an excitation device for vibrating the guide member so that sound pressure for preventing the fiber bundle from contacting the guide surfaces is generated.
  • the excitation device vibrates the guide member at a predetermined resonant frequency (for example, approximately 34 kHz), and thus, the guide member guides the fiber bundle in a non-contact state.
  • a guide member having a pair of guide portions, each of which includes a tapered portion and a straight portion which continues on the downstream side of the tapered portion in the advancing direction of the fiber bundle.
  • the tapered portions are formed so that the distance between the two guide surfaces gradually increases in the direction opposite to the advancing direction.
  • the straight portions are formed so that the distance between the two guide surfaces is constant along the advancing direction. The fiber bundle is guided from the tapered portions to the straight portions.
  • An objective of the present invention is to provide a fiber bundle guiding apparatus for a spinning machine in which a transition portion through which a fiber bundle moves from tapered portions to straight portions in a guide member is prevented from becoming clogged with fibers, and at the same time, high quality thread can be spun stably.
  • a fiber bundle concentrating apparatus for a spinning machine includes a guide member and an excitation device.
  • the guide member guides a fiber bundle which moves along a predetermined advancing direction.
  • the guide member has a pair of guide surfaces which face each other and guide a fiber bundle in such a manner that the width of the fiber bundle becomes narrower.
  • the excitation device vibrates the guide member to generate sound pressure.
  • the guide member is provided with a pair of guide portions in plate form which are placed in such a manner as to face each other so that the pair of guide surfaces are formed.
  • the pair of guide portions each have a straight portion and a tapered portion which is located on the upstream side of the straight portion in the advancing direction of the fiber bundle.
  • Each straight portion and the corresponding tapered portion are made continuous by a connection portion.
  • the straight portions form an outlet through which the fiber bundle is fed out from the guide member.
  • the straight portions are formed in such a manner that the distance between the two guide surfaces is constant along the advancing direction of the fiber bundle, and the tapered portions are formed in such a manner that the distance between the two guide surfaces gradually becomes greater toward a direction which is opposite to the advancing direction of the fiber bundle.
  • the shape of the guide portions is set so that when the guide member is vibrated at a predetermined frequency by the excitation device.
  • the outlet and the connection portions are located in locations different from the nodes of vibration.
  • a ring spinning machine having the fiber bundle concentrating apparatus according to the above first aspect of the present invention is provided.
  • a draft device 11 shown in Fig. 1A is of a four-line type and provided with a three-line type draft part and a pair of final delivery rollers 26 provided on the downstream side of the above described draft part in an advancing direction of a fiber bundle F.
  • the three-line type draft part is provided with a front bottom roller 12, a middle bottom roller 13 and a back bottom roller 14.
  • Support brackets 16 and 17 are fixed in such a manner as to be adjustable in position in the front or rear direction relative to the roller stand 15 that forms the base of the machine, and the middle bottom roller 13 and the back bottom roller 14 are supported by these support brackets 16 and 17, respectively.
  • a front top roller 21, a middle top roller 22 and a back top roller 23 are respectively supported by the frame 20b of the weighting arm 20 so as to correspond to the front bottom roller 12, the middle bottom roller 13 and the back bottom roller 14, respectively, with top roller supporting members.
  • the weighting arm 20 has a lever 20a which is rotatable between a pressure applying position and a released position. As shown in Fig. 1A , in a state where the lever 20a contacts the frame 20b in such a state as to be placed in a pressure applying position, the respective top rollers 21, 22 and 23 which are supported by the weighting arm 20 are held in a locked state in a pressure applying position (spinning position), in which the top rollers 21, 22 and 23 are pressed by the bottom rollers 12, 13 and 14. In addition, the above described locked state is cancelled in a state where the lever 20a has been rotated upward to the released position from the state shown in Fig. 1A .
  • the final delivery roller pair 26 includes a bottom nip roller 26a supported by the roller stand 15 and a top nip roller 26b supported by the weighting arm 20 with a support member.
  • the top nip roller 26b is supported by the weighting arm 20 with a support member per two spindles, in the same manner as the front top roller 21 of the draft device 11.
  • a fiber bundle concentrating apparatus 30 that forms a fiber bundle guiding apparatus is placed between the final delivery roller pair 26 and the pair of front rollers 12 and 21 located on the upstream side of the final delivery roller pair 26.
  • the fiber bundle concentrating apparatus 30 is provided with a guide member 31 and an excitation device 32 for vibrating the guide member 31.
  • the excitation device 32 vibrates the guide member 31 in such a manner that sound pressure for reducing the width of the fiber bundle F is generated. That is, the sound pressure is applied to the fiber bundle F in such a direction that the width of the fiber bundle F is reduced.
  • the guide member 31 includes a pair of flat plates 33 and a spacer 34 for connecting the two flat plates 33 at a predetermined distance.
  • Each flat plate 33 is provided with a proximal end portion 33a which is fixed to the spacer 34 through, for example, brazing, a middle portion 33b which is narrower than the proximal end portion 33a, and a guide portion 35, which extends approximately perpendicular to the middle portion 33b. That is to say, the guide member 31 is provided with a pair of guide portions 35 in plate form which face each other. The facing surfaces of the pair of guide portions 35 form the above described pair of guide surfaces 35a.
  • the guide surfaces 35a guide the fiber bundle F in such a manner that the width of the fiber bundle F becomes smaller toward the advancing direction of the fiber bundle F.
  • the middle portion 33b and the proximal end portion 33a of each flat plate 33 function as a support portion for supporting the guide portion 35.
  • Each support portion is a portion in plate form which continues to the guide portion 35 and is connected to
  • each guide portion 35 is provided with a straight portion 35b and a tapered portion 35c which is located on the upstream side of the straight portion 35b in the advancing direction of the fiber bundle F.
  • the straight portions 35b are formed in such a manner that the distance between the two facing guide surfaces 35a is constant along the advancing direction of the fiber bundle F.
  • the tapered portions 35c are formed in such a manner that the distance between the two facing guide surfaces 35a gradually and continuously becomes greater toward the direction opposite to the advancing direction of the fiber bundle F.
  • the guide members 31 are formed so that the distance between the facing straight portions 35b is 1 mm or less, though this may be different depending on the conditions for spinning. As shown in Fig.
  • the straight portions 35b and the tapered portions 35c continue via a connection portion 35e.
  • the straight portions 35b form an outlet 35d through which the fiber bundle F is fed out from the guide member 31.
  • the shape of the guide portions 35 is set in such a manner that when the guide member 31 is vibrated at a predetermined frequency by the excitation device 32, the location of the outlet 35d of the straight portion 35b and the location of the connection portion 35e become locations different from the nodes of vibration.
  • the nodes of vibration correspond to portions where the amplitude of vibration for generating sound pressure in the guide surfaces 35a of the guide portions 35 is minimum in the longitudinal direction of the guide portions 35.
  • the shape of the guide portions 35 is set in such a manner that when the guide member 31 is vibrated at a predetermined frequency by the excitation device 32, the location of the outlet 35d of the straight portions 35b and the location of the connection portions 35e coincide with peaks of vibration as shown in Fig. 1B .
  • the peaks of vibration correspond to locations where the amplitude of the vibration for generating sound pressure on the guide surfaces 35a of the guide portions 35 is maximum in the longitudinal direction of the guide portions 35.
  • the left side of the straight line L indicated by a two-dot chain line is the straight portion 35b.
  • the shape of the guide portions 35 is set in such a manner that when the guide member 31 is vibrated at a predetermined frequency by the excitation device 32, the total length of the guide portions 35 corresponds to the wavelength of the vibration. Accordingly, the length of the straight portions 35b is the same as the length of the tapered portions 35c.
  • the excitation device 32 is preferably provided with a transducer 36, which is a Langevin transducer, and this transducer 36 has a pair of piezoelectric elements 37a and 37b in ring form.
  • An electrode plate 38 in ring form is placed between the two piezoelectric elements 37a and 37b, and metal blocks 39 and 40 contacting the surface of the respective piezoelectric elements 37a and 37b on the side opposite to the electrode plate 38.
  • These piezoelectric elements 37a and 37b, the electrode plate 38, and the metal blocks 39 and 40 are secured and fastened to each other with bolts (not shown), and thus, the transducer 36 is formed.
  • the bolt is screwed into a screw hole (not shown) created in the metal block 39 from the side of the metal block 40.
  • the two metal blocks 39 and 40 are in such a state as to be electrically connected via the bolt.
  • a flange 39a is formed at a distal end of the metal block 39, and the metal block 39 is secured to an attachment piece 41 through the flange 39a.
  • the transducer 36 is secured to the roller stand 15 via the attachment piece 41 with a bolt (not shown).
  • the guide member 31 is secured to a horn 42 which is vibrated by the transducer 36.
  • a distal end of the horn 42 is secured in a portion close to one end of the above described guide member 31 through brazing.
  • the horn 42 is secured to the transducer 36 on the proximal end surface on the side opposite to the distal end surface to which the guide member 31 is secured.
  • the distal end surface of the horn 42 is a plane perpendicular to the direction of the axis of the transducer 36.
  • the transducer 36 is connected to an oscillator 43.
  • the electrode plate 38 is connected to the oscillator 43 via a wire 44a and the ground terminal of the oscillator 43 is connected to the metal block 40 via a wire 44b.
  • the transducer 36, the horn 42 and the oscillator 43 form the excitation device 32 for vibrating the guide member 31.
  • the oscillator 43 excites the transducer 36 so that the guide member 31 vibrates at a frequency higher than the audible region for humans.
  • the location of the middle bottom roller 13 and the back bottom roller 14 is adjusted to an appropriate location by adjusting the location of the support brackets 16 and 17 in accordance with the material to be spun.
  • the location of the middle top roller 22 and the back top roller 23 is also adjusted so as to correspond to the location of the middle bottom roller 13 and the back bottom roller 14.
  • the fiber bundle F is drafted in the three-line type draft part of the draft device 11, and after that guided into the nipping portion of the final delivery roller pair 26 via the guide surfaces 35a of the guide members 31, and fed out through the final delivery roller pair 26.
  • the transducer 36 is excited with the resonant frequency (for example approximately 30 kHz) of the guide member 31 as the oscillator 43 is driven, and as a result, the horn 42 vibrates longitudinally so as to generate flexural vibration of the guide members.
  • the guide portion 35 extends in the direction in which the fiber bundle F is drawn out, and therefore, the guide portions 35 vibrate in wave form in a planar view.
  • the vibration of these guide portions 35 has an amplitude in the direction of the longitudinal vibration of the horn 42 (in the left-right direction in Fig. 2B ), and has peaks, which are locations where the amplitude is maximum, and nodes, which are locations where the amplitude becomes minimum.
  • the fiber bundle F moves downstream while being twisted after passing through the nipping point between the bottom nip roller 26a and the top nip roller 26b, and is wound around a bobbin, not shown.
  • the final delivery roller pair 26 are rotated in such a manner that the surface speed is slightly greater than the surface speed of the front bottom roller 12 and the front top roller 21, and therefore, the fiber bundle F changes in direction and moves downstream while being twisted after passing through the nipping point between the final delivery roller pair 26 in such a state as to be appropriately tense.
  • the fiber bundle F that is drafted in the three-line type draft part is guided into the space between the final delivery roller pair 26 in such a state as to be compressed so that the width is 1 mm or less while passing between the guide surfaces 35a. Accordingly, fuzzing and waste cotton are suppressed, so that the quality of the thread is improved in comparison with fine spinning machines where a three-line type draft device which does not have a fiber bundle concentrating apparatus 30 is provided.
  • the shape of the guide portions 35 is designed so that when the guide member 31 is vibrated by the excitation device 32, the outlet 35d of the straight portions 35b and the connection portion 35e are located in peaks of vibration. Therefore, the amplitude of the vibration becomes maximum in the connection portions 35e, which easily become clogged with fibers, and therefore, sound pressure applied to the fiber bundle F in the connection portions 35e also becomes greater. Thus, the energy for driving the excitation device 32 required to vibrate the guide member 31 is reduced to the utmost while preventing the guide portions 35 from becoming clogged with fibers. In addition, the amplitude of the vibration becomes maximum in the outlet 35d of the straight portions 35b.
  • the amplitude of the vibration becomes the tolerable value X or greater in Fig. 4 in the outlet 35d of the straight portions 35b and the connection portions 35e, so that the quality of the thread is prevented from deteriorating and the thread is prevented from being cut.
  • the guide portions 35 may be formed so as to have a length which does not correspond to the wavelength of vibration, while the location of the outlet 35d of the straight portions 35b and the location of the connection portions 35e coincide with peaks of vibration.
  • the number of nodes of vibration is not limited to one between the outlet 35d and the connection portions 35e which are located in peaks of vibration, for example.
  • the number of nodes may be N, which is a natural number no less than two, and thus, the guide portions 35 may be formed so as to have a length which corresponds to N times the wavelength of vibration. Under conditions where the length of the guide portions is the same, however, the amplitude in peak portions becomes larger as the frequency of vibration becomes lower, and therefore, it is preferable for the guide portions 35 to have a total length which corresponds to the wavelength of vibration.
  • the location of the outlet 35d and the location of the connection portions 35e it is not necessary for the location of the outlet 35d and the location of the connection portions 35e to coincide with peaks of vibration, and they may be different from the nodes of vibration. If the location of the outlet 35d and the location of the connection portions 35e coincide with the nodes of vibration, the amplitude of vibration cannot be sufficiently large in the outlet 35d and the connection portions 35e. Contrastingly, if the location of the outlet 35d and the location of the connection portions 35e are different from the nodes of vibration, the amplitude can be sufficiently large, depending on the energy applied to the excitation device 32. However, if the outlet 35d and the connection portions 35e are located close to the nodes of vibration the energy required for making the amplitude of vibration sufficiently large in the outlet 35d and the connection portions 35e becomes large.
  • the outlet 35d and the connection portions 35e are located close to peaks of vibration.
  • “Close to the peak of vibration” means that the distance from a peak of vibration is, for example, in a range within 20% of the distance between an adjacent peak and node.
  • the guide members 31 are not limited to having a configuration where two flat plates 33 are connected via a spacer 34.
  • the guide member 31 shown in Fig. 5A is provided with a single proximal end portion 33a secured to a horn 42, a pair of middle portions 33b in plate form which are provided integrally with this proximal end portion 33a, and a pair of guide portions 35 in plate form which are provided integrally with the distal ends of the pair of middle portions 33b.
  • the guide member 31 shown in Fig. 5B is provided with a proximal end portion 33a in single plate form, a middle portion 33b in single plate form, and a pair of guide portions 35 in plate form.
  • the guide member 31 in Fig. 2B and the guide member 31 in Fig. 5A make it easier to form the guide portions 35 in such a manner that the guide portions 35 vibrate as desired than the guide members 31 in Fig. 5B .
  • the straight portions 35b may be longer than the tapered portions 35c instead of the configuration where the connection portions 35e are located at approximately the center in the longitudinal direction of the guide portions 35.
  • the length between the connection portions 35e and the outlet 35d in the guide portions 35 shown in Fig. 6 is approximately two times greater than the length between the connection portions 35e and the inlet of the guide portions 35.
  • the total length of the guide portions 35 corresponds to 3/2 the wavelength of vibration, so that the four locations of the outlet 35d, the center portion between the outlet 35d and the connection portions 35e, the connection portions 35e and the inlet of the tapered portions 35c coincide with peaks of vibration.
  • the middle portion 33b it is preferable for the middle portion 33b to be connected to a guide portion 35 in one of three portions corresponding to the nodes of vibration.
  • the straight portions 35b may be shorter than the tapered portions 35c.
  • the tapered portions 35c do not necessarily extend in straight line form in such a manner that the guide surfaces 35a become a plane, but may curve in such a manner that the guide surfaces 35a become a curved surface. Thus, the tapered portions 35c and the straight portions 35b smoothly continue through the connection portions 35e, which is preferable. In addition, in the case where the tapered portions 35c extend essentially in straight line form, only portions in the vicinity of the connection portions 35e may be smoothly curved, so that the tapered portions 35c smoothly continue to the straight portions 35b.
  • the guide member 31 may be formed of two independent plates, and transducers 36 may be attached to the respective plates.
  • the shape of the sides of the guide portions 35 is not limited to a shape which becomes narrower toward the two ends (inlet and outlet) in the longitudinal direction, but may be in such a shape as to have a constant width throughout the entirety in the longitudinal direction.
  • the guide member 31 may be secured to the horn 42 through soldering or using an adhesive, or secured and fastened with a bolt, instead of being secured through brazing.
  • the horn 42 may have any form, for example truncated cone form or columnar form.
  • the transducer 36 of the excitation device 32 is not limited to a piezoelectric element, and may be formed of a magnetostrictor or a super magnetostrictor.
  • a fiber bundle concentrating apparatus includes a guide member having a pair of guide surfaces which face each other and guide a fiber bundle so that the width of the fiber bundle is narrowed, and an excitation device for vibrating the guide member to generate sound pressure.
  • the guide member includes a pair of guide portions which are placed to face each other, so that the guide surfaces are formed.
  • Each guide portion has a straight portion and a tapered portion, which are made continuous by a connection portion.
  • the straight portions are formed so that the distance between the two guide surfaces is constant, and the tapered portions are formed so that the distance between the two guide surfaces gradually becomes greater toward a direction opposite to the advancing direction of the fiber bundle.
  • the straight portions form an outlet through which the fiber bundle is fed out from the guide member.
  • the shape of the guide portions is set so that when the guide member is vibrated at a predetermined frequency by the excitation device, the outlet and the connection portions are located in locations different from the nodes of vibration.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP08157271A 2007-06-01 2008-05-30 Vorrichtung zum Konzentrieren von Faserbündeln für eine Spinnmaschine Withdrawn EP2006427A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007147176A JP2008297676A (ja) 2007-06-01 2007-06-01 紡機における繊維束集束装置

Publications (2)

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EP2006427A2 true EP2006427A2 (de) 2008-12-24
EP2006427A3 EP2006427A3 (de) 2008-12-31

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EP08157271A Withdrawn EP2006427A3 (de) 2007-06-01 2008-05-30 Vorrichtung zum Konzentrieren von Faserbündeln für eine Spinnmaschine

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EP (1) EP2006427A3 (de)
JP (1) JP2008297676A (de)
CN (1) CN101314875A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2045377A1 (de) * 2007-10-05 2009-04-08 Kabushiki Kaisha Toyota Jidoshokki Vorrichtung zum Konzentrieren von Faserbündeln in einer Spinnmaschine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016094682A (ja) * 2014-11-13 2016-05-26 村田機械株式会社 ドラフト装置及び紡績ユニット
CN108221098B (zh) * 2018-01-17 2019-08-20 东华大学 一种纺纱装置及采用该纺纱装置的平行纺纱方法
CN108754717A (zh) * 2018-06-12 2018-11-06 常州天虹纺织有限公司 一种异形纺纱设备及异形纺纱方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007009391A (ja) 2005-06-02 2007-01-18 Toyota Industries Corp 紡機における繊維束案内装置及び精紡機のドラフト装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH697457B1 (de) * 2004-07-14 2008-10-31 Holding Fuer Industriebeteiligungen Ag Druckwalzeneinheit.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007009391A (ja) 2005-06-02 2007-01-18 Toyota Industries Corp 紡機における繊維束案内装置及び精紡機のドラフト装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2045377A1 (de) * 2007-10-05 2009-04-08 Kabushiki Kaisha Toyota Jidoshokki Vorrichtung zum Konzentrieren von Faserbündeln in einer Spinnmaschine

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CN101314875A (zh) 2008-12-03
EP2006427A3 (de) 2008-12-31
JP2008297676A (ja) 2008-12-11

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