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EP 0 393 779 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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02.06.1993 Bulletin 1993/22 |
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Date of filing: 17.04.1990 |
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Automatic device for resetting a mechanical yarn feeler in a textile machine
Automatische Vorrichtung, die einen mechanischen Fadenfühler wieder in seine Betriebsstellung
bringt
Dispositif automatique pour repositionner un tâteur méchanique de fil dans une machine
textile
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Designated Contracting States: |
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CH DE FR GB LI |
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Priority: |
21.04.1989 IT 2025489
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Date of publication of application: |
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24.10.1990 Bulletin 1990/43 |
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Proprietor: SAVIO S.p.A. |
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33170 Pordenone (IT) |
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Inventors: |
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- Meroni, Roberto
I-33170 Pordenone (IT)
- Gerin, Umberto
I-33170 Pordenone (IT)
- Lancerotto, Fabio
I-20131 Milan (IT)
- Colussi, Vittorio
I-33170 Pordenone (IT)
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Representative: De Carli, Erberto et al |
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ING. BARZANO & ZANARDO MILANO S.p.A.
Via Borgonuovo, 10 20121 Milano 20121 Milano (IT) |
(56) |
References cited: :
FR-A- 2 333 880
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FR-A- 2 362 223
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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[0001] This invention relates to a device for resetting a mechanical yarn feeler in a textile
machine, and in particular for automatically repositioning a yarn feeler delicately
and accurately so as to prevent any impact with and stressing of the yarn.
[0002] The present invention is described with reference to a twisting station, but can
also be advantageously applied to other processes and machines for yarn production,
or in the textile industry generally.
[0003] The figure shows that part of a two-for-one twisting station comprising the unwinding
head 1 fed with yarns 2 and 3 from underlying feed bobbins, the double twisted yarn
4 passing from the yarn guide ring 5 to the deviator roller 6 and draw-off cylinder
7.
[0004] The yarn feeler 8 is shown in its rest position against the stop 9. It is pivoted
at 10 and its terminal L-shaped part has to be brought to bear against the yarn 4
just above the ring 5 and with its horizontal part orthogonal to the figure.
[0005] In twisting stations the yarn feeler 8 halts the twisting operations by falling downwards
whenever the yarn breaks. In resetting the yarn the yarn feeler 8 is returned to the
indicated rest position, to be returned to its working position on restarting. The
yarn feeler 8 generally has a certain weight, and by allowing it to fall under its
own weight onto the yarn it could damage the yarn or indeed bounce back to its rest
position.
[0006] The purpose of the device according to the invention is to return the yarn feeler
8 into contact with the yarn 4 accurately and delicately.
[0007] The device according to the invention consists of an extendable arm 11 which emerges
from and retracts into a cylinder 12 acting as a guide and profiled in such a manner
as to prevent the arm 11 rotating about its axis, for example by being of square cross-section,
or by the use of an external supplementary rod, it being operated pneumatically, hydraulically
or mechanically, and carries at its end 13 a magnetic engagement member, shown enlarged
in the detailed view. This consists of a plate 14 able to undergo limited rotation
in the plane of the figure by being pivoted on the pivot 15 and comprising a pin 16
which is rigid with the end 13 to allow the plate 14 to swivel through a limited range
defined by the slot 17. A magnet member 18 is positioned on the end of the plate 14.
[0008] The cylinder 12 can be supported by a further presentation arm 19 by means of the
bracket 20.
[0009] To reset the yarn feeler 8 the extendable arm 11 is extended until it causes the
magnet 18 to make contact with the body of the yarn feeler 8.
[0010] The plate 14 positions itself such as to allow the magnet 18 to adhere over its entire
length.
[0011] The arm 11 is then retracted to pull the yarn feeler 8 with it, and as the yarn feeler
rotates about its pivot 10 the magnet 18 and the plates 14 rotate about the pivot
15 as allowed by the pin 16 which slides in the slot 17.
[0012] When the allowable rotation has been totally undergone, the magnet 18 is forced to
separate from the yarn feeler as the horizontal part of this latter rests and is levered
on the appropriately inclined surface of the plate 14. The yarn feeler 8 is still
supported by the plate 14 because its horizontal arm slides on the upper face of the
plate 14. The slot 17 is sized preferably so that the magnet separates well before
the final resting position of the horizontal part of the yarn feeler 8 on the yarn
is reached.
[0013] As the retraction of the arm 11 withdraws the plate 14 beyond the yarn 4, the horizontal
part of the L-shaped yarn feeler 8 comes to rest softly against the yarn.
[0014] The device according to the invention can also be formed without pivoting the plate
14, by giving the magnetic member 18 a curved outer surface to adapt to the curve
21 sliding along it over a portion of the rotary movement of the yarn feeler 8 which
enables it to overcome the top dead centre position and then proceed in its movement
towards the yarn 4 by simply resting on the body of the plate 14.
1. An automatic device for resetting a mechanical yarn feeler in a textile machine which
moves a L-shaped yarn feeler from a rest position to a working position in which it
bears against the yarn by means of its L-shaped end part, caracterised by consisting
of an extendable arm 11 carrying a support plate 14 for a magnet 18 which comes into
engagement with the body of the yarn feeler and causes it to rotate while adhering
to itself through a limited arc of rotation, to then release it and carry it resting
on the non-magnetic part of the plate 14 during the remaining part of the rotation
until it bears against the yarn 4.
2. An automatic device for resetting a mechanical yarn feeler in a textile machine as
claimed in claim 1, characterised in that the plate 14 is pivoted to the extendable
arm 11 to undergo a limited rotation enabled by a slot 17 traversed by a pin 16.
3. An automatic device for resetting a mechanical yarn feeler in a textile machine as
claimed in claim 2, characterised in that the arc through which the yarn feeler 8
rotates while adhering to the magnet 18 is determined by the angular width of the
slot 17.
4. An automatic device for resetting a mechanical yarn feeler in a textile machine as
claimed in claim 1, characterised in that the magnet 18 has a curved external profile
such that it enters into engagement along the corresponding curvature of the yarn
feeler 8 and remains adhering to it along a limited arc of rotation.
1. Automatische Vorrichtung zum Zurücksetzen eines mechanischen Fadenfühlers in einer
Textilmaschine, die einen L-förmigen Fadenfühler aus einer Ruhestellung in eine Betriebsstellung
bringt, in der dieser mit seinem L-förmigen Endabschnitt an einem Faden anliegt, gekennzeichnet
durch einen verlängerbaren Arm 11, der eine Aufnahmeplatte 14 für einen Magneten 18
trägt, der mit dem Gehäuse des Fadenfühlers in Eingriff kommt und diesen veranlaßt,
sich zu drehen während er an ihm für einen begrenzten Drehwinkel anhaftet, um ihn
dann loszulassen und ihn auf dem nicht-magnetischen Teil der Platte 14 ruhend, während
des restlichen Teils der Drehung zu tragen, bis er an dem Faden 4 anliegt.
2. Automatische Vorrichtung zum Zurücksetzen eines mechanischen Fadenfühlers in einer
Textilmaschine nach Anspruch 1, dadurch gekennzeichnet, daß die Platte 14 an dem verlängerbaren
Arm 11 schwenkbar gelagert ist, um eine begrenzte Drehung auszuführen, die durch einen
von einem Stift 16 durchdrungenen Schlitz 17 ermöglicht ist.
3. Automatische Vorrichtung zum Zurücksetzen eines mechanischen Fadenfühlers in einer
Textilmaschine nach Anspruch 2, dadurch gekennzeichnet, daß der Bogen, den der Fadenfühler
8 beschreibt, während er an dem Magneten 18 anhaftet, durch die Winkelbreite des Schlitzes
17 bestimmt ist.
4. Automatische Vorrichtung zum Zurücksetzen eines mechanischen Fadenfühlers in einer
Textilmaschine nach Anspruch 1, dadurch gekennzeichnet, daß der Magnet 18 ein gekrümmtes
äußeres Profil aufweist, so daß es längs der entsprechenden Krümmung des Fadenfühlers
8 in Eingriff kommt und während eines begrenzten Bogens der Drehung an ihm anhaftend
verbleibt.
1. Dispositif automatique pour repositionner un tâteur mécanique de fil dans une machine
textile qui déplace un tâteur de fil en forme de L d'une position de repos vers une
position de fonctionnement dans laquelle il appuie contre le fil au moyen de sa partie
d'extrémité en forme de L, caractérisé par le fait qu'il comporte un bras extensible
(11) portant une plaque-support (14) destinée à un aimant (18) qui vient en contact
avec le corps du tâteur de fil et le fait tourner, tout en lui étant collé, selon
un arc de rotation limité, pour le relâcher ensuite et le transporter en appui sur
la partie non magnétique de la plaque (14) pendant le reste de la rotation jusqu'à
ce qu'il appuie contre le fil 4.
2. Dispositif automatique pour repositionner un tâteur mécanique de fil dans une machine
textile selon la revendication 1 caractérisé en ce que la plaque (14) est fixée sur
pivot au bras extensible (11) pour subir une rotation limitée autorisée par une fente
(17) traversée par un axe (16).
3. Dispositif automatique pour repositionner un tâteur mécanique de fil dans une machine
textile selon la revendication 2 caractérisé en ce que l'arc dont tourne le tâteur
de fil (8) pendant qu'il est collé à l'aimant (18) est déterminé par la largeur angulaire
de la fente (17).
4. Dispositif automatique pour repositionner un tâteur mécanique de fil dans une machine
textile selon la revendication 1, caractérisé en ce que l'aimant (18) à un profil
externe courbe de telle sorte qu'il vient en contact le long de la courbure correspondante
du tâteur de fil (8) et lui reste collé le long d'un arc de rotation limité.
