EP0709510B1 - Dispositif pour le déplacement latéral des tissus dans des machines de grattage - Google Patents

Dispositif pour le déplacement latéral des tissus dans des machines de grattage Download PDF

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Publication number
EP0709510B1
EP0709510B1 EP95116257A EP95116257A EP0709510B1 EP 0709510 B1 EP0709510 B1 EP 0709510B1 EP 95116257 A EP95116257 A EP 95116257A EP 95116257 A EP95116257 A EP 95116257A EP 0709510 B1 EP0709510 B1 EP 0709510B1
Authority
EP
European Patent Office
Prior art keywords
fabric
napping
lengthwise
bar
switching device
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 - Lifetime
Application number
EP95116257A
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German (de)
English (en)
Other versions
EP0709510A1 (fr
Inventor
Bruno Scortegagna
Martino Cervo
Gianrenato Ruaro
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.)
Lafer SpA
Original Assignee
Lafer SpA
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Filing date
Publication date
Application filed by Lafer SpA filed Critical Lafer SpA
Publication of EP0709510A1 publication Critical patent/EP0709510A1/fr
Application granted granted Critical
Publication of EP0709510B1 publication Critical patent/EP0709510B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/02—Registering, tensioning, smoothing or guiding webs transversely
    • B65H23/032—Controlling transverse register of web
    • B65H23/038—Controlling transverse register of web by rollers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C11/00—Teasing, napping or otherwise roughening or raising pile of textile fabrics

Definitions

  • This invention concerns a device to switch fabrics for napping machines, as set forth in the main claim.
  • the invention concerns a switching device which enables the fabric being fed to a napping machine to be displaced laterally in a desired manner.
  • This lateral displacement is performed so as to direct the fabric to distinct desired lengthwise segments of the napping rollers so as to make the napping action of those rollers uniform as compared to the differentiated wear which is encountered on the relative roller clothing as the napping passes follow one another.
  • the textile field covers napping machines in which the fabric runs over a napping drum, which bears on its circumference napping rollers provided on their periphery with hooked pins or needles, which come into contact with the fabric so as to form the surface nap.
  • the lengthwise extent of these napping rollers is always greater than the width of the fabric being processed so as to be able to cover with the same machine a very wide range of widths of fabrics and so as to ensure definitely that the whole width of the fabric undergoes the napping action.
  • this roller clothing becomes more worn at the middle than at the ends since the middle is always affected by the passing of the fabric with any width of the fabric.
  • This differentiated wear of the roller clothing entails a different napping action at the middle of the fabric from that at the selvedges or edges of the fabric, and the result in particular is that the nap near the selvedges is greater than that encountered at the middle of the fabric.
  • This situation entails also a break of the continuity of the cycle, corrective work by the labour force, downtimes, etc.
  • Guiding means have been disclosed at the present time which are used to convey the fabric to the desired position and which enable the fabric to be displaced sideways by a few centimetres (about 10 to 15) inasmuch as a greater displacement entails the formation of folds in the fabric itself.
  • DE-A-27 27 474 (upon which the preamble of claim 1 is based) discloses a device suitable to cause a lateral displacement of a web being fed in a napping machine the device consisting of three screw-threaded rolls, of which the intake and output rolls have the same pitch, while the intermediate roll has an opposite pitch.
  • the threaded rolls are driven by one and the same motor and, in view of their screw-threaded surface configuration, displace the web sideways while drawing it forwards.
  • the direction of rotation of the three rolls is inverted simultaneously, so that the rolls rotate at least for a time in a direction opposed to the feed of the fabric, thus entailing problems as regards the tension and at least the surface quality of the fabric itself.
  • This device makes possible lateral displacements of a very limited value and causes folds and tensions in the fabric being fed.
  • DE-A-1.574,386 too discloses a device able to displace laterally a web being fed, however not in combination with a napping machine.
  • This device comprises an intake roll and an output roll for the fabric and a pair of transmission bars which can be inclined so as to cause the lateral displacement.
  • the output roll can be displaced only axially, transversly to the direction of feed of the fabric, in relation to the displacement caused in the fabric by the inclination of the bars.
  • This situation has the purpose of keeping the output roll aligned with the laterally displaced position taken up by the fabric.
  • the purpose of the invention is to provide a fabric-switching device suitable to displace laterally, even by a considerable extent, the fabric being fed to a napping machine without causing the formation of folds in the fabric.
  • the invention is applied in particular to napping operations which include a plurality of successive passes, either with the combination of a plurality of napping machines in line, or with a plurality of passes on the same machine but with the fabric itself joined together as an endless ring.
  • the switching device is associated with a napping drum so as to displace the fabric laterally in a desired manner before the fabric undergoes a napping pass.
  • the device includes two lengthwise bars, namely a first fabric intake bar and a second fabric output bar.
  • At least one powered roll is positioned between the first fabric intake bar and the second fabric output bar.
  • the powered roll is associated with a transmission roll.
  • the inclusion of the powered roll discharges the tension of the fabric being fed, and thus prevents the formation of folds, especially where the fabrics are wetted and have a given strength.
  • the lengthwise bars and the drawing and transmission rolls are associated with relative displacement means which enable the respective lengthwise axes of the bars and rolls to be inclined in relation to the axis of feed of the fabric.
  • these lengthwise bars and rolls have a first working position with their lengthwise axes substantially perpendicular to the axis of feed of the fabric; in this position the fabric is drawn forwards without any lateral displacements being imparted to the fabric.
  • the lengthwise bars have also a plurality of second working positions in which the relative lengthwise axes of the bars are inclined by one and the same desired angle, depending on the extent of the lateral displacement required, in relation to the axis of feed of the fabric.
  • the powered and transmission rolls are in turn inclined according to the inclination of the lengthwise bars so that the relative lengthwise axes of the rolls always remain perpendicular to the axis of feed of the fabric.
  • the winding of the fabric onto the first fabric intake bar causes an inclination of the axis of feed of the fabric, this inclination being twice the inclination of the intake bar.
  • the rolls Since the axes of the rolls have to be kept perpendicular to the axis of feed of the fabric, the rolls are inclined in turn by an angle twice the angle of inclination of the first intake bar.
  • the rolls cause the fabric to be fed according to a direction inclined in relation to the normal direction of feed without causing further displacements of the fabric.
  • the second output bar in turn is inclined by an angle equal to the angle of inclination of the first intake bar and in the same direction of inclination.
  • the pass of the fabric over the second output bar causes a second displacement of the fabric, which at the outlet of the switching device thus lies in a position parallel to the direction of intake but displaced laterally in relation to the direction of intake.
  • the extent of the lateral displacement can be determined precisely during working inasmuch as it depends on the angle of inclination imparted to the intake and output bars and on the distance between those bars.
  • the angle of inclination is kept unchanged during the whole cycle of napping of a fabric.
  • the fabric is fed onto the napping drum at one position and at the end of the cycle lies in a determined position displaced laterally on the napping drum.
  • the angle of inclination of the intake and output bars and therefore of the drawing rolls is changed during the pass of the fabric.
  • the fabric is displaced laterally on the napping drum while it is being fed and takes up a position at the end of the cycle which may even coincide with the position at the beginning of the cycle.
  • Fig.1 is a diagram of a napping machine 11 which includes a napping drum 12 bearing a plurality of napping rollers 13 provided with hooked pins or needles along their periphery.
  • the napping method employing the napping machine 11 includes a plurality of passes of a fabric 14 on the napping drum 12 by connection of the two ends of the fabric 14 to form an endless ring, a vessel 15 being included on which the fabric 14 can slide; the case (not shown here) is analogous in which the fabric 14 is fed to a plurality of napping machines 11 positioned in line.
  • a switching device 10 is included in cooperation with the napping drum 12 and is suitable to displace laterally the fabric 14 while the latter is being fed.
  • This lateral displacement has the purpose of directing the fabric 14, during and after each napping pass, onto a desired lengthwise segment of the napping rollers 13 so as to prevent the formation of pre-ordined zones of wear on the clothing of the napping rollers 13, particularly in the central zone of the napping rollers 13.
  • the continuing pass of the fabric 14 fed, for instance, on the centre of the napping rollers 13 causes a more accentuated wear of the central zone 16 of the clothing of the napping rollers 13 as compared to the ends 17 of that clothing.
  • Fig.3 shows as an example a situation which is created when a napping of a fabric 14 having a width " l " is followed by the napping of a fabric 14 having a width " L “ greater than “ l ".
  • the first napping cycle causes a more accentuated wear of a central zone 16 having a width " l ".
  • Figs.4a, 4b and 4c instead show three different napping cycles in which a switching device 10 is employed.
  • the switching device 10 is represented for the sake of simplicity merely by the lengthwise bar 20 and is inclined by a fixed angle " ⁇ " to the axis 29 of feed of the fabric 14 during the whole napping cycle; this fixed inclination causes a lateral displacement of the fabric 14 on the napping rollers 13 according to the arrow 30 from a position " A “ at the beginning of the cycle to a position " A' “ at the end of the cycle.
  • this variation causes a lateral displacement of the fabric 14 on the napping rollers 13 and a return substantially to the position " A " of the beginning of the cycle.
  • the lengthwise bar 20 is initially kept substantially perpendicular to the axis 29 of feed of the fabric 14, thus providing a substantially central positioning of the fabric 14 at the position " A " on the napping rollers 13.
  • the bar 20 is then inclined alternately first by an angle "+ ⁇ ” and then by an angle "- a " so as to displace the fabric 14 laterally firstly to position " A1 “ and then to position " A2 “ and then to take up again the position " A " at the end of the cycle, these lateral displacements being shown with the arrow 32.
  • the lateral displacement of the fabric 14 on the napping roller 13 enables the formation of the nap 18 to be kept uniform over the whole width of the fabric and also enables the wear of the clothing of the napping rollers 13 to be kept substantially uniform.
  • the switching device 10 is positioned in cooperation with the napping drum 12 and includes, in the preferred embodiment shown in Figs.1 and 2, a first fabric intake lengthwise bar 20 and a second fabric output lengthwise bar 21.
  • a powered roll 22 and a transmission roll 23 are positioned between the lengthwise bars 20 and 21 and have the purpose of reducing the tension on the fabric 14 caused by the angle of winding of the fabric 14 on those bars 20-21 and of preventing the formation of folds on the fabric 14.
  • the first and second lengthwise bars 20-21 and the rolls 22-23 are associated with displacement means (not shown here) which are suitable to cause in those bars and rolls an inclination in relation to the axis 29 of feed of the fabric 14.
  • the purpose of this is to position the bars 20-21 according to a direction more or less inclined in relation to a line perpendicular to the direction of intake 24 of the fabric 14 in relation to the lateral displacement to be imparted to the fabric 14, and to keep the rolls 22-23 perpendicular to that direction of intake 24.
  • the lengthwise bars 20-21 have a first position with their relative lengthwise axes 26-28 substantially perpendicular to the direction of intake 24 of the fabric 14.
  • This first position entails a direction of output 25 of the fabric 14 coinciding substantially with the direction of intake 24 since no lateral displacement has been imparted.
  • the first intake bar 20 When it is desired to impart a lateral displacement to the fabric 14 being fed, the first intake bar 20 is inclined and its relative lengthwise axis 26 is caused to take up a position inclined in one direction or the other in relation to the line perpendicular to the direction of intake 24 of the fabric 14.
  • the angle of inclination " ⁇ " imparted to the first intake bar 20 causes downstream of the intake bar 20 a displacement of the axis 29 of feed of the fabric 14 by an angle " 2 ⁇ " in relation to the direction upstream.
  • the displacement of the transmission roll 23 has not been indicated in Fig.2 but coincides with the displacement of the powered roll 22.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Looms (AREA)

Claims (8)

  1. Dispositif pour le déplacement de tissus dans des machines de grattage (11), permettant le déplacement latéral sélectif d'un tissu (14) introduit dont l'axe d'introduction (29) est sensiblement perpendiculaire à l'axe du tambour de grattage (12), le dispositif comprenant au moins une première barre d'entrée longitudinale (20), et une deuxième barre de sortie longitudinale (21),
    ledit dispositif étant caractérisé en ce qu'il comprend au moins un rouleau moteur (22) placé entre la première barre (20) et la deuxième barre (21), la première barre (20), la deuxième barre (21) et le rouleau moteur (22) occupant une première position dans laquelle leurs axes respectifs (26, 28, 27) sont sensiblement perpendiculaires à l'axe d'introduction (29) du tissu (14), et au moins une deuxième position dans laquelle leurs axes resxpectifs (26, 28, 27) sont inclinés d'un angle respectif (α, γ, β) par rapport à la ligne perpendiculaire à l'axe d'introduction (29) du tissu (14).
  2. Dispositif de déplacement (10) selon la revendication 1,
    dans lequel la première barre d'entrée longitudinale (20), la deuxième barre de sortie longitudinale (21) et le rouleau moteur (22) occupent au moins une troisième position dans laquelle leurs axes respectifs (26, 28, 27) sont inclinés d'une valeur respective (-α, -γ, -β) par rapport à la ligne perpendiculaire à l'axe d'introduction (29) du tissu (14).
  3. Dispositif de déplacement (10) selon la revendication 1 ou 2,
    dans lequel l'angle d'inclinaison respectif (α, γ, β) reste inchangé au cours de tout le cycle de grattage du tissu (14).
  4. Dispositif de déplacement selon la revendication 1 ou 2,
    dans lequel l'angle d'inclinaison respectif (α, γ, β) varie au cours du cycle de grattage du tissu (14).
  5. Dispositif de déplacement (10) selon l'une quelconque des revendications précédentes,
    dans lequel au cours de chaque étape du cycle de grattage du tissu (14), les angles respectifs (α, γ) de la première (20) et de la deuxième (21) barre sont identiques.
  6. Dispositif de déplacement (10) selon l'une quelconque des revendications précédentes,
    dans lequel, au cours de chaque étape du cycle de grattage du tissu (14), l'angle d'inclinaison (β) du rouleau moteur (22) est le double de l'angle d'inclinaison (α, γ) de la première (20) et de la deuxième (21) barre longitudinale (β = 2α = 2γ).
  7. Dispositif de déplacement (10) selon l'une quelconque des revendications précédentes,
    dans lequel un rouleau de transmission inclinable (23) est inséré au moins entre le rouleau moteur (22) et la deuxième barre de sortie longitudinale (21).
  8. Dispositif de déclacement (10) selon la revendication 7,
    dans lequel le rouleau de transmission (23) est toujours parallèle au rouleau moteur (22).
EP95116257A 1994-10-28 1995-10-16 Dispositif pour le déplacement latéral des tissus dans des machines de grattage Expired - Lifetime EP0709510B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD940179 1994-10-28
IT94UD000179A IT1267311B1 (it) 1994-10-28 1994-10-28 Dispositivo deviatore di tessuto, vantaggiosamente per macchine garzatrici

Publications (2)

Publication Number Publication Date
EP0709510A1 EP0709510A1 (fr) 1996-05-01
EP0709510B1 true EP0709510B1 (fr) 1998-08-12

Family

ID=11421669

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95116257A Expired - Lifetime EP0709510B1 (fr) 1994-10-28 1995-10-16 Dispositif pour le déplacement latéral des tissus dans des machines de grattage

Country Status (4)

Country Link
EP (1) EP0709510B1 (fr)
DE (1) DE69504006T2 (fr)
ES (1) ES2121274T3 (fr)
IT (1) IT1267311B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6659006B2 (en) * 1995-08-30 2003-12-09 Goss Graphic Systems Inc. Tension control device for a printing press

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB348276A (en) * 1930-03-10 1931-05-14 Charles Augustus Dickhaut Improvements in guiding devices for travelling webs of paper, cloth and other materials
US3095131A (en) * 1959-07-06 1963-06-25 Mount Hope Machinery Ltd Web guiding method and apparatus
US3235934A (en) * 1963-09-11 1966-02-22 Os Nap Inc Oscillatory napping apparatus
DE1574386C2 (de) 1967-03-08 1973-10-18 Vits-Maschinenbau Gmbh, 4018 Langenfeld Einrichtung zur Sicherung der seitlichen Registerhaltigkeit von mit seitlicher Versetzung ankommenden Bahnen
RO74013A (fr) 1976-07-16 1981-01-30 Veb Textilmaschinenbau,Dd Machine a carder produits textils en forme de feuille

Also Published As

Publication number Publication date
DE69504006D1 (de) 1998-09-17
IT1267311B1 (it) 1997-01-28
ES2121274T3 (es) 1998-11-16
ITUD940179A1 (it) 1996-04-28
DE69504006T2 (de) 1999-01-21
ITUD940179A0 (it) 1994-10-28
EP0709510A1 (fr) 1996-05-01

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