EP0070953B1 - Etirage à barrettes perfectionné à trajectoire circulaire - Google Patents

Etirage à barrettes perfectionné à trajectoire circulaire Download PDF

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Publication number
EP0070953B1
EP0070953B1 EP81830075A EP81830075A EP0070953B1 EP 0070953 B1 EP0070953 B1 EP 0070953B1 EP 81830075 A EP81830075 A EP 81830075A EP 81830075 A EP81830075 A EP 81830075A EP 0070953 B1 EP0070953 B1 EP 0070953B1
Authority
EP
European Patent Office
Prior art keywords
rotating
combs
needles
heads
sliver
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.)
Expired
Application number
EP81830075A
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German (de)
English (en)
Other versions
EP0070953A1 (fr
Inventor
Ferdinando Viaggi
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 SpA
Original Assignee
Officine Savio SpA
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Filing date
Publication date
Application filed by Officine Savio SpA filed Critical Officine Savio SpA
Priority to DE8181830075T priority Critical patent/DE3175529D1/de
Priority to AT81830075T priority patent/ATE23201T1/de
Priority to EP81830075A priority patent/EP0070953B1/fr
Publication of EP0070953A1 publication Critical patent/EP0070953A1/fr
Application granted granted Critical
Publication of EP0070953B1 publication Critical patent/EP0070953B1/fr
Expired 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
    • D01H5/02—Gill boxes or other drafting machines employing fallers or like pinned bars

Definitions

  • This invention concerns gill boxes with rotating heads; to be more specific, the invention refers to improved gill boxes with rotating heads comprising a plurality of innovations which have a very great effect on every characteristic of the gill box itself.
  • Gill boxes are known which are of a type that includes at least one pair of rotating heads which pull into rotation along a pre-set course a plurality of needles acting on an assemblage of slivers fed substantially continuously. Said needles penetrate into the slivers in an interlaced position so as to carry out the combing and drawing phase.
  • the invention concerns such a type of gill box with rotating combs as is composed substantially of:- a feeder group of at least two rollers, one lower roller and one upper pressure roller, said group having the task of feeding the plurality of slivers coming from the creel or from a preceding treatment station up to the apparatus comprising the pair of heads with rotating combs: a group to control the fibres which consists of a pair of heads with combs, said heads being superimposed one above the other and rotating in opposite directions and having respectively a plurality of needles protruding from said heads: and a drawing group consisting of a pair of twin rollers together with an upper pressure roller and having the task of nipping the fibres and withdrawing them from the slivers controlled by the needles of the combing head.
  • the operation carried out on the slivers passing through is called the drawing operation and, as its outcome, the fibres are made parallel and the sliver itself is improved.
  • Patent DE-C-72717 - MEUNIER - proposes a gill box with only one plurality of needle bars running radially along slots envisaged at the ends of the bars and forming part of the two motive wheels, being positioned as desired by two inner cams and an outer steel band.
  • the inner countercam system is hard to realize because it tends of necessity to rotate, and we are not shown how it is expected to clamp it, nor is it even indicated how the grooved disk can rotate.
  • Patent DE-C-259689- BOUDRY- proposes a device like that of DE-C-72717 but with a different path for the needles. Our remarks concerning DE-C-72717 are applicable to this patent too.
  • Patent GB-A-431.984 - ATELIERS SAINT ELOI - proposes a system of rotating needles of which the carrying bars cooperate with cranks and circular cams.
  • crank system cooperating with intersecting cams imposes rather a low maximum speed of rotation.
  • Patent US ⁇ A ⁇ 2740996 - DUDLEY - proposes a head with rotating needles, the needles being positioned on a plurality of bars rotating along a circumference.
  • a set of rollers present at the ends of the bars and cooperating with external cams positions the needles before, during and after the drawing action.
  • the DUDLEY invention also has a very limited working zone and too few combs to be able to function satisfactorily. Moreover, the system employed to rotate the combs is expensive, as also are the individual combs, without doubt; besides, their replacement is very complicated.
  • Patent FR-A-1248933 - PRINCE - SMITH - proposes a device with two huge paired wheels which have a plurality of radial slots. Within these slots can run the heads of needle bars, of which the radial displacement is conditioned by a cam and countercam.
  • the tract where the sliver cooperates with the needles is devoid of the countercam, so that centrifugal force improves total penetration.
  • This invention has a very long and irregular control zone.
  • the sliver has to follow a broken line consisting of two arcs and a straight line.
  • the drawing action is presumably divided into two zones.
  • Patent DE-A-1510455 - VEB - proposes a device which also comprises two opposed flanges with radial slots cooperating with needle bars shaped like an omega.
  • a suction device is envisaged to aspirate the dirt, but this device increases the adherence of fibres to the combs and not their separation therefrom, thus accentuating the formation of lumps.
  • Patent IT-A-818249 - GRAMONI - proposes some auxiliary blades for cleaning the needles; the blades cooperate with disks having multiple through millings (radial) and with lateral flanges having their circuit machined to provide a cam, said circuit cooperating with the ends of the needle bars and with the auxiliary cleaning blades.
  • Patent ES-A-242206 - ESTIVI LL - proposes a rotating head with combs, wherein the combs are circumferentially positioned by two opposed flanges, whilst they are radially disposed by two external cams.
  • This patent has the shortcoming of comprising weak grooved flanges, since the tapering towards the middle of the grooves involves a weakening that prevents the flanges from resisting fatique. Moreover, the proposed system of cams is imperfect and unsuitable for use.
  • Patent ES-A-291517 - ESTIVILL - proposes some improvements to the foregoing ES-A--242206. Said improvements concern an improved cam system which encloses the whole course, the coupling of two rotating heads to widen the drawing field, the provision of outside cleaning means, and other aspects of little importance.
  • Patent ES-A-386439 - ESTIVILL - proposes, in fact, a solution with an intersecting design, as given earlier in ES 291517.
  • Our invention therefore, contains a plurality of improvements to the known art from which it springs and which it innovates profoundly, overcoming many problems which hitherto have not been solved and which have always constituted, up to the present time, a limitation for this type of comb field.
  • the invention consists of gill box with rotating heads, which works at high speed and comprises a plurality of needles that act on an assemblage of slivers fed substantially continuously, and which is composed of a feeder group, a group controlling the fibres that consists of a pair of heads with combs, the heads being superimposed one above the other and rotating in synchronism, and of a drawing group, each head comprising rotating means with slots defining guide means that guide the end portions of the combs, fixed guide cam means that cooperate with the combs and are located at an intermediate position between the needle field and such rotating guide means, means to lubricate such rotating guide means, the fixed guide cam means including a portion shaped to effect differential rates of insertion of the needles of the two heads into the sliver, a portion shaped to effect a perpendicular and non-interfering withdrawal of the needles from the sliver, and a portion shaped to effect individual protrusion of the combs for easy cleaning of the needles, the gill box being
  • the gear wheel 12 and the wheel 11 are mounted, positioned and supported on the stationary frame 13, which is in coordinated cooperation with the frame 14, which can be moved in its upper part or be folded book-wise to facilitate access to the needle field and thus to facilitate the operations of feeding the sliver and cleaning.
  • the gear wheel 12 meshes with a gear wheel 15 solidly fixed to the disk with the grooves or guides 16; the disk 17 has a circumferential toothing which serves to transmit motion to the coordinating bar 18 through the gear wheels 19-119 and to transmit motion to the flange 117 bearing the slots 116.
  • Both the flange 17 and the flange 117 are positioned in opposed pairs, so that the slots 16 or 116 face each other.
  • the pairs of flanges 17-117 are connected by the bar 18 through gear wheels 19-119. This causes the flanges 17 and also the flanges 117 to rotate constantly in a coordinated manner.
  • the lay-out realized also enables the motion coming from 12 to be equally distributed not only along one path but through two different paths, namely through the shafts 18-118 and through direct transmission between the flanges 17 and flanges 117.
  • the upper head 20 can be fully opened by being made to rotate around the axis 120, the two needle fields being rendered accessible in this way.
  • the play is lessened because the kinematic mechanism is simplified to consist of a simple pair of gear wheels, whereas in all known models a set of at least four gear wheels has had to be employed.
  • slots 16 and 116 can run the combs 22, which comprise at their ends a substantially plane-parallel zone 23, while the needle field 24 lies in a middle position.
  • zone 25 which comprises at its corners some rounded-off areas 26 suitable for improving the working of the bar within the path imposed on it by the cams 27 and 28.
  • the combs have the needles inserted at a desired angle a to the lengthwise plane of the comb.
  • the needles 29 are inserted advantageously at an inclination and are installed in the gill box in such a way that their teeth are sloped in the opposite direction to that of the forward movement of the combs. As shown in Fig. 5, this conformation enables the slots 16 to be made very small since the combs are not stressed too greatly in the transmission zone.
  • This conformation of the slots 16 and, more generally, the conformation of the flange 17 enable a very strong guide to be obtained between one slot 16 and its neighbour since the connection of the guide 30 to the flange 17 takes place at the rear and no longer in a zone near the middle as in the previous models.
  • the slots 16 are not radial but are realized advantageously at a tangent to a concentric circle, their inclination being in phase concordance or phase difference; it has been verified advantageously (see Fig. 2) that it is more convenient for the overall phenomena to realize phase difference as regards the direction of rotation.
  • radial guides 16 are indicated in a generic and wrong meaning, the foregoing being actually meant.
  • the upper head 20 and lower head 21 both consist of two facing frames which uphold and support a shaft or stiffening and connecting bar 32, which by means of keys 39 becomes solidly fixed torsionally to the frames themselves.
  • This stiffening bar 32 also serves to position and fix the internal cams 27, again with the employment of key means 39 or other means which are similar and produce the same technical effect.
  • the rotating flange 17 is supported in a revolving manner by means of bearings on the stiffening and connecting bar 32.
  • the stiffening and connecting bar 32 comprises a plurality of holes 34 which serve to feed the fluid under pressure, which flows out within the path of the combs 22.
  • Said pluralities of holes 34 work in coordinated cooperation with the diffusers 35 so that the chamber 124 circumscribed by the combs 22 in the lower head 21 and upper head 20 can be put under slight air pressure so as to facilitate the departure of the fibres from the needles 29 in the drawing phase. This overpressure also hinders the entry of dirt into the chamber circumscribed by the plurality of combs 22.
  • the diffusers 35-135 cooperate with the zones 44 and 45 where the combs leave the fibres during the drawing phase.
  • the conduit 36 feeds the lubricating fluid under pressure through 38 into the zone where the grooves or slots 16 rotate, so that said grooves 16, owing also to the centrifugal effect due to rotation of the flange 17, are lubricated constantly by said fluid under pressure.
  • One or more alignment elements 51 are envisaged for supporting and positioning the internal conduit 36. At least one of said alignment elements 51 comprises some through channels 52 to permit the fluid under pressure 33 to pass to the holes 34.
  • the life of the combs 22 is greatly prolonged. This is the case because, in the zone where they cooperate with the cams 27 and 28, the combs are (or can be) considerably wider and higher and therefore have a bigger supporting surface.
  • This bigger supporting surface in the zone 25 of the combs 22 also leads to less wear on the cams 27 and 28.
  • the greater width leads to less wear on the cam 28, while the greater height leads to less wear on the slots 116.
  • the closure insert can be fixed directly on the cam 28, as shown in Fig. 3, or the insert 42 can be fixed directly onto the frame 13 or 14 with appropriate screws, as shown in Fig. 4; in this case the insert 42 will have suitable clearances at its sides.
  • This constructional detail enables a channel between the external cam 28 and the insert 42 to be eliminated, and this permits said external cam 8 to be deformed freely in an elastic manner under the mechanical impulses conveyed to it by the combs 22.
  • said external cam 28 can be constructed in such a way that its natural frequency is different from the frequency of the blows of the combs 22 caused by the high speed of rotation; advantageously the natural frequency of vibration of the external cam 28 will be greater than the frequency of the blows of the combs 22 so as to enable said external cam to be deformed under the impact of a comb 22 and to recover before the next comb strikes it.
  • the setting-up bar 18-118 is covered with a fixed protective sleeve 53.
  • This solution makes it possible to maintain communication between the two chambers located behind the cams 27 and 28 on one side and the other and can be used advantageously to maintain a circulaton of cooling liquid, which also invests the wheels 19 and the flanges 17.
  • the cams 27 and 28 have a special conformation, which is also a result of the studies and experiments of the author.
  • the zone 43 or zone of entry of the sliver, has been designed so as to enable the needles of the upper field and the needles of the lower field to be inserted into the sliver without colliding against each other.
  • the shaping 46 of the upper cam 128 is advantageously kept slightly curved so as to graduate the entry of the needles 29 into the sliver better, whereas the shaping 47 of the lower cam 28 is kept almost straight so as to obtain greater control of the sliver of fibres.
  • the exits 44 and 45 have two different conformations, which reflect differentiated requirements in the behaviour of the needles 29 in respect of the sliver leaving the gill box.
  • the exit 44 is located slightly more to the rear and has a more rounded shape than the exit 45.
  • the exit 45 with its more pointed and elongated shape make possible a better control of the sliver even during its outgoing phase.
  • the conformation provided for the cams 27,28,127 and 128, as can be seen in Fig. 3, is such as to permit a substantially perpendicular departure of the needles 29 from the sliver.
  • the conformation given to the cams 27, 28, 127 and 128 enables a sharp variation to be obtained in the direction of speed of the combs 22 and thereby a perpendicular departure of the needles 29 from the sliver.
  • the positions 48 and 49 ensure, instead, individual protrusion of the combs from the grooves of the upper and lower flanges so as to make possible the cleaning by means of the known system of rotating brushes.
  • the system 68 of the rotating brushes can be envisaged to comprise a rotating brush 62 and a needle-carrying 66 oscillating bar 65, which is contained within a tubular element having a plurality of holes 67 and which rotates around an offset centre 64.
  • the feeder group shown in Fig. 2 is envisaged as having three rollers 59, 60 and 61 but could also have only two rollers. The same can be said for the drawing system at the exit, which in our example is shown with three rollers 56, 57 and 58.
  • the distance travelled by the outgoing sliver is given by the gap between the point 54 where the teeth 29 of the lower needle field leave the sliver and the point 55 where the rollers 56 and 57 grip the outgoing fibres.
  • said outgoing distance has been reduced to about 22-25 mm, and this permits any type of fibre to be processed with excellent results.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Cultivation Receptacles Or Flower-Pots, Or Pots For Seedlings (AREA)
  • Soil Working Implements (AREA)

Claims (10)

1. Dispositif d'étirage de rubans à têtes rotatives, qui travaille à grande vitesse et comprend une pluralité d'aiguilles qui agissent sur un assemblage de rubans acheminés de façon sensiblement continue, et qui est composé d'un groupe d'alimentation (59,60,61), d'un groupe de maîtrise des fibres qui est composé d'une paire de têtes munies de peignes (20, 21), les têtes étant superposées l'une au-dessus de l'autre et tournant en synchronisme, et d'un groupe d'étirage (54, 55, 58), chaque tête comprenant des moyens rotatifs (17) présentant des rainures (16) qui définissent des moyens de guidage (30) qui guident les parties d'extrémité (23) des peignes (22), des moyens formant cames de guidage fixes (27,127) qui coopèrent avec les peignes et sont placés dans une position intermédiaire entre le champ d'aiguilles (24) et les moyens de guidage rotatifs (17), des moyens (36,38) servant à lubrifier lesdits moyens de guidage rotatifs (16, 30), les moyens formant cames de guidage fixes (27,127) comprenant une partie (46, 47) conformée de façon à donner des vitesses différenciées d'enfoncement des aiguilles (29) des deux têtes dans le ruban, une partie (44, 45, 16, 30, 22) conformée pour donner un mouvement de retrait des aiguilles (29) par rapport au ruban, qui est perpendiculaire et non gênant, et une partie (48, 49) conformée pour imprimer aux peignes une poussée en avant individuelle pour assurer la facilité du nettoyage (62) des aiguilles (29), le dispositif d'étirage de rubans étant caractérisé par les particularités suivantes:
- les parois des rainures définissant les moyens de guidage (30) sont reliées entre elles à leur partie de base;
- des moyens formant contre-cames rigides (28, 128) servant au guidage extérieur des peignes (22) par rapport aux moyens formant cames de guidage fixes (27, 127);
- des moyens servant à acheminer (32, 33) et à transporter (35) un fluide sous pression dans le voisinage de la zone (44, 46) d'extraction des aiguilles du ruban et dans chaque champ d'aiguilles (24);
- des moyens de lubrification (36,38) servant à débiter sélectivement un lubrifiant pulvérisé dans les rainures (16), dans la partie de ces rainures (16) qui présente une vitesse périphérique réduite; - les moyens de guidage rotatifs sont disposés sur chaque côté du champ d'aiguilles et sont reliés entre-eux par des moyens d'engrenages d'entraîmement (17, 18, 19);
- un trajet libre du ruban à la sortie des champs d'aiguilles (24), ce trajet libre étant d'une longueur comprise entre 22 et 25 mm.
2. Dispositif d'étirage de rubans à têtes rotatives selon la revendication 1, caractérisé par le fait que les moyens rotatifs (17) comprennent les rainures (16) séparées par des guides (30) qui sont solidement fixés au corps du flasque (17) dans leur partie arrière, de sorte que lesdites rainures (16) se trouvent sensiblement tangentes à un cercle concentrique audit flasque (17).
3. Dispositif d'étirage de rubans à têtes rotatives selon la revendication 1 ou la revendication 2, caractérisé par le fait que les peignes (22) possèdent à leurs extrémités des moyens du type blocs coulissants (23) qui coopèrent avec les moyens de guidage (30) présents sur les moyens rotatifs (17) et comprennent, entre le champ d'aiguilles (24) et lesdits blocs (23), des moyens (25) destinés à coopérer avec lesdits moyens formant cames fixes (27, 28).
4. Dispositif d'étirage de rubans selon la revendication 1 et une ou l'autre des revendications suivantes, caractérisé par le fait que les moyens formant cames de guidage fixes (27, 28) comprennent des moyens (42) permettant de remplacer les peignes (22).
5. Dispositif d'étirage de rubans à têtes rotatives selon la revendication 1 et l'une ou l'autre des revendications suivantes, caractérisé par le fait que la partie extérieure (28) des moyens formant cames de guidage fixes est avantageusement réalisée avec une fréquence de vibration différente de la fréquence de la percussion des peignes (22), de telle manière que ladite fréquence de vibration de la partie extérieure (28) soit plus grande que ladite fréquence de la percussion des peignes (22).
6. Dispositif d'étirage de rubans à têtes rotatives selon la revendication 1 et l'une ou l'autre des revendications suivantes, caractérisé par le fait que l'extraction perpendiculaire des aiguilles (29) du ruban est obtenue par la coopération coordonnée des moyens (44, 45) présents dans les moyens du type cames (27, 28) avec l'inclinaison des guides (30) prévus dans les moyens rotatifs (17), avec la conformation de la zone de circulation (25) des peignes (22) et avec l'inclinaison des aiguilles (29), les moyens (44) se trouvant avantageusement plus loin vers l'arrière que les moyens (45).
7. Dispositif d'étirage de rubans à têtes rotatives selon la revendication 1 et l'une ou l'autre des revendications suivantes, caractérisé par le fait que la réduction du jeu angulaire est obtenue par la coopération coordonnée des moyens rotatifs (17) avec les peignes (22) et également des moyens formant cames (28) avec la zone de circulation (25) desdits peignes (22), de telle manière que les moyens rotatifs (17) des deux champs d'aiguilles (20, 21) soient directement en prise entre eux et soient reliés aux moyens rotatifs réciproques (17) placés en position frontale par des moyens (18) du type arbres qui portent des roues d'engrenage (19, 119) en prise avec lesdits moyens rotatifs (17).
8. Dispositif d'étirage de rubans à têtes rotatives selon la revendication 1 et l'une ou l'autre des revendications suivantes, caractérisé par le fait que la chambre intérieure (124) du champ d'aiguilles est maintenue sous pression par un fluide sous pression acheminé (33, 34) et au moins partiellement débité par des diffuseurs (35) dans la zone (44, 45) dans laquelle les peignes (22) quittent le ruban de fibres.
9. Dispositif d'étirage de rubans à têtes rotatives selon la revendication 1 et l'une ou l'autre des revendications suivantes, caractérisé par le fait que la réduction de la distance parcourue par les rubans sortants est obtenue par la conformation sensiblement pointue (45) des cames (27, 28) du champ d'aiguilles inférieur (21).
10. Dispositif d'étirage de rubans à têtes rotatives selon la revendication 1 et l'une ou l'autre des revendications suivantes, caractérisé par le fait que la tête supérieure (20) peut s'ouvrir en tournant sur un axe arrière (120).
EP81830075A 1981-07-31 1981-07-31 Etirage à barrettes perfectionné à trajectoire circulaire Expired EP0070953B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE8181830075T DE3175529D1 (en) 1981-07-31 1981-07-31 Improved gill boxes with rotating heads
AT81830075T ATE23201T1 (de) 1981-07-31 1981-07-31 Nadelstabstrecke mit in drehenden kreisscheiben eingefuehrten nadelstaeben.
EP81830075A EP0070953B1 (fr) 1981-07-31 1981-07-31 Etirage à barrettes perfectionné à trajectoire circulaire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81830075A EP0070953B1 (fr) 1981-07-31 1981-07-31 Etirage à barrettes perfectionné à trajectoire circulaire

Publications (2)

Publication Number Publication Date
EP0070953A1 EP0070953A1 (fr) 1983-02-09
EP0070953B1 true EP0070953B1 (fr) 1986-10-29

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EP81830075A Expired EP0070953B1 (fr) 1981-07-31 1981-07-31 Etirage à barrettes perfectionné à trajectoire circulaire

Country Status (3)

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EP (1) EP0070953B1 (fr)
AT (1) ATE23201T1 (fr)
DE (1) DE3175529D1 (fr)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES386439A1 (es) * 1970-12-14 1971-05-01 Llaurado Estivill Marti Cejudo Perfeccionamientos en maquinas intersectings.
GB1428124A (en) * 1972-06-09 1976-03-17 Agfa Gevaert Image intensification process and photographic material for use thereofr

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Publication number Publication date
EP0070953A1 (fr) 1983-02-09
DE3175529D1 (en) 1986-12-04
ATE23201T1 (de) 1986-11-15

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