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EP 2 149 408 B2 |
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NEW EUROPEAN PATENT SPECIFICATION |
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After opposition procedure |
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Date of publication and mentionof the opposition decision: |
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10.12.2014 Bulletin 2014/50 |
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Mention of the grant of the patent: |
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30.03.2011 Bulletin 2011/13 |
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Date of filing: 24.07.2009 |
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International Patent Classification (IPC):
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Sheet metal accumulator of the loop type with traction winding and corresponding method
Schlaufenförmiger Bandmetallspeicher zum Wickeln unter Zug und zugehöriges Verfahren
Accumulateur de bandes métalliques en forme de boucle pour un enroulement sous traction
et méthode correspondante
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Designated Contracting States: |
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AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO
PL PT RO SE SI SK SM TR |
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Priority: |
29.07.2008 IT MI20081395
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Date of publication of application: |
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03.02.2010 Bulletin 2010/05 |
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Proprietor: Olimpia 80 SRL |
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27020 Borgo San Siro (PV) (IT) |
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Inventors: |
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- Travini, Vittorio
27020 Borgo San Siro (Pavia) (IT)
- Bosoni, Riccardo
29010 Agazzano (Piacenza) (IT)
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Representative: Petruzziello, Aldo et al |
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Racheli S.r.l.
Viale San Michele del Carso, 4 20144 Milano 20144 Milano (IT) |
(56) |
References cited: :
WO-A1-00/61312 JP-A- 59 024 527 KR-A- 20040 039 920
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WO-A1-2006/028328 KR-A- 20040 037 832 KR-A- 20040 039 921
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[0001] The present invention refers to a sheet metal accumulator of the loop type with traction
winding.
[0002] In the field of pipes and/or welded sections produced on continuous production lines,
sheet metal accumulators which act as a reservoir to allow constant feeding of the
production line situated downstream of the accumulator are well known to the art and
normally used.
[0003] The accumulator is normally placed between at least one coil-carrying reel and the
production line and accumulates a sufficient amount of sheet metal to allow an empty
reel to be replaced with a reel bearing a coil of sheet metal and to join the sheet
metal of the new coil with the "tail" of the sheet metal already unwound from the
empty coil without having to stop the production line.
[0004] Many types of sheet metal accumulator are known to the art, amongst which can be
cited, purely by way of example, pit accumulators (free loop) and accumulators of
the loop type with thrust-type winding (known as floops) which have the great drawback
of not operating correctly if the sheet metal is (too) thin and/or is made of (overly)
ductile material.
[0005] A sheet metal accumulator of the loop type with traction winding is able to overcome
the aforementioned drawback. Systems (such as, for example, coil winders) which accumulate
sheet metal by traction are known to the art, but the Applicant is not aware of accumulators
that accumulate sheet metal in loops by traction.
[0006] KR 1020040039921 discloses a sheet metal accumulator of the loop type which, to prevent the loosening
of the loop(s) of sheet metal wound on the rolls of the rotatable turntable, provides
strip laxity preventing means, comprising a plural links and a tightening roll, which
acts on the outer surface of said sheet metal loop(s).
[0007] KR 2004 0039920 discloses a sheet metal accumulator of the loop type, comprising a mobile internal
turntable and a fixed external one, having a plurality of winding roll and a lead
roll, rotating forwards and backwards on the fixed turntable.
[0008] To avoid interference, if any, with the lead roll, each winding roll is supported
by means tilting it of a certain angle towards the centre of the turntable when the
lead roll arrives.
[0009] KR 2004 0039920 further comprises means rotating each winding roll around its axis.
[0010] Object of the present invention is to produce a sheet metal accumulator of the loop
type with traction winding that does not present the drawbacks and limitations previously
described; this object is achieved by means of a sheet metal accumulator of the loop
type with traction winding having the features set forth in claim 1.
[0011] Further advantageous characteristics of the invention form the subject matter of
the dependent claims.
[0012] The sheet metal accumulator of the loop type with traction winding is adapted to
be placed between a source of sheet metal (preferably a coil-carrying reel) and a
production line and comprises at least one inlet group, a pinch roll, an external
mobile turntable, an internal fixed turntable coaxial with the mobile one, a helical
path integral to the fixed turntable and adjustment means situated at the in-put and
at the output of the accumulator.
[0013] The two turntables carry a plurality of rolls, suited to carry loops of sheet metal,
which are mounted on swinging arms connected to one another by tie rods and moved
by hydraulic or pneumatic means (or by other functionally equivalent hydraulic means),
operation of which is managed by a logic unit that controls also adjustment means
suited to control and adjust at least the tension of the sheet metal entering the
accumulator.
[0014] The loops of sheet metal are traction wound on said rolls.
[0015] The invention will now be described with reference to purely exemplifying (and therefore
non limiting) embodiments illustrated in the appended figures, wherein:
- Figure 1 shows diagrammatically a front view of a sheet metal accumulator of the loop
type produced according to the invention, in a working condition;
- Figure 2 shows diagrammatically a side view of the sheet metal accumulator of Figure
1;
- Figure 3 shows diagrammatically a rear view of the sheet metal accumulator of Figure
1;
- Figure 4 shows diagrammatically the sheet metal accumulator of Figure 1 in a stand-by
condition;
- Figure 5 shows diagrammatically the sheet metal accumulator of Figure 1 in a first
step of winding of the sheet metal onto the fixed and mobile turntables;
- Figure 6 shows diagrammatically the sheet metal accumulator of Figure 1 in a second
step of winding of the sheet metal, following that of Figure 5.
[0016] In the appended figures corresponding elements will by identified by the same reference
numerals.
[0017] Figure 1 shows diagrammatically a front view of a sheet metal accumulator 1 produced
according to the invention, which is carried by a metal structure 100 and which comprises
at least one inlet group 2 suited to guide the sheet metal 20, a pinch roll 3, a mobile
roll (dandy roll) 4 which controls the tension of the incoming sheet metal 20, a series
of idle rolls 5, an external mobile turntable 6 carrying an idle traction roll 12,
an internal fixed turntable 7 (coaxial with the turntable 6) carrying an idle transmission
roll 13, a helical path 15 (seen better in Figure 2) integral with the fixed turntable
7 and a mobile roll (dandy roll) 18 which controls the tension of the sheet metal
20 exiting the accumulator 1.
[0018] The inlet group 2, the pinch roll 3, the mobile rolls (4, 18), the idle rolls (5,
12, 13) and the helical path 15 will not be described herein because they are known
to a person skilled in the art.
[0019] The two turntables 6, 7 carry a plurality of rolls 8 suited to carry the loops of
sheet metal traction wound on said rolls 8, which are mounted on swinging arms 9 connected
to one another by tie rods 10 and driven by pistons 11 (or by other known hydraulic
means; Figure 3), operation of which is managed by a logic unit which, preferably,
also controls the pinch roll (̵3)̵ and the external turntable 6.
[0020] For the sake of simplicity of the graphic representation, the logic unit and its
sensors and actuators have been omitted in the appended figures; moreover, in Figure
1 only one loop of sheet metal has been indicated on the mobile turntable 6 and on
the fixed turntable 7.
[0021] In the working condition (Figure 1), the sheet metal 20 passes through the inlet
group 2, the pinch roll 3, the mobile roll 4 and the idle rolls 5 to reach the traction
roll 12 of the mobile turntable 6 which, rotating with the turntable 6, winds up the
entering sheet metal 20 onto the loops of sheet metal present on the mobile turntable
6 and, at the same time, winds up onto the loops of sheet metal present on the fixed
turntable 7 the sheet metal 20 coming from the loop of sheet metal in contact with
the rolls 8 of the mobile turntable 6.
[0022] The sheet metal 20 coming from the fixed turntable 7 and from the helical path 15
passes beneath the mobile roll 18 before reaching the production line.
Figure 2 shows diagrammatically a side view of the sheet metal accumulator 1 of Figure
1; for the sake of simplicity of the graphic representation, in Figure 2 only the
metal structure 100, the mobile turntable 6, the helical path 15, one of the rollers
8, one of the swinging arms 9 and one of the tie rods 10 have been denoted by the
respective reference numerals.
Figure 3 shows diagrammatically a rear view of the sheet metal accumulator 1 of Figure
1; visible in Figure 3 are the metal structure 100, the inlet group 2, the pinch roll
3, the means 41 that control the mobile roll 4, the rear part of the mobile turntable
6 carrying the hydraulic cylinders 11 which act on the pins of the swinging arms 9
and the rear part of the fixed turntable 7.
[0023] In the embodiment illustrated in Figure 3, each hydraulic cylinder 11 acts on the
pin of one of the swinging arms 9, mechanically coupled to the pins of the adjacent
swinging arms 9 by means of the tie rods 10.
Figure 4 shows diagrammatically the sheet metal accumulator 1 of Figure 1 in the stand-by
condition: the sheet metal 20 passes only in the inlet group 2, in the pinch roll
3, on the mobile roll 4, on the idle rolls 5, on the idle transmission roll 13, on
the helical path 15 and on the mobile roll 18 (which controls the tension of the sheet
metal 20 exiting the accumulator 1) without involving the two turntables 6, 7.
Figures 5 and 6 show diagrammatically the sheet metal accumulator 1 of Figure 1 in
two successive steps of winding of the sheet metal 20 on the mobile and fixed turntables
6, 7.
[0024] Starting from the stand-by condition (Figure 4) in which the input speed of the sheet
metal 20 is equal to the output speed, the mobile turntable 6 begins to turn in a
counter-clockwise direction (in the embodiment described here) causing the input speed
of the sheet metal 20 into the accumulator 1 to be greater than its output speed towards
the production line. The traction roll 12, integral with the turntable 6, draws the
sheet metal 20 against the transmission roll-13 of the fixed turntable 7 (Figure 5)
and then onto the rolls 8 carried by the mobile turntable 6 and by the fixed turntable
7 (Figure 6) and continues to rotate at this speed until the pre-set number of loops
has been formed on the two turntables 6, 7.
[0025] It should be remembered that the input speed of the sheet metal 20 into the accumulator
1 correlates with the rotation speed of the pinch roll 3 and that during formation
of the loops on the two turntables 6, 7, the sheet metal 20 leaves the accumulator
1 at the speed required to feed the production line.
[0026] When the required number of loops has been formed on the two turntables (̵6, 7)̵,
the mobile turntable 6 and the pinch roll 3 reduce their rotation speed so that when
the mobile turntable 6 is at a standstill, the quantity of sheet metal (̵20)̵ that
enters into the accumulator 1 is equal to that exiting towards the production line.
[0027] Once this situation has been reached, the pinch roll 3 gradually slows down until
it stops (blocking the incoming sheet metal 20) while the mobile turntable 6 starts
rotating in a direction opposite to the previous one to pay off the loops formed on
the turntables 6 and 7 and feed the production line with the sheet metal 20 stored
in the accumulator 1.
[0028] The fact that the pinch roll 3 blocks the incoming sheet metal 20 allows the sheet
metal source to be replaced, joining another coil to the end of the incoming sheet
metal 20.
[0029] When there is no more sheet metal 20 stored in the accumulator 1, the mobile turntable
gradually slows down until it stops and, if the inflow of sheet metal 20 to the inlet
thereof has been restored, it switches (or can switch) to the stand-by condition (Figure
4) and, subsequently, once again winds up (or can wind up) the sheet metal 20 onto
the two turntables 6 and 7 (Figures 5 and 6).
[0030] Operation of the traction accumulator 1 of the present invention will not be described
in greater detail because it is obvious to a person skilled in the art or in any case
can be deduced from operation of thrust-type accumulators known to the art.
[0031] Without departing from the scope of the invention which is defined by the appended
claims, a person skilled in the art can make to the sheet metal accumulator previously
described all those modifications and improvements suggested by normal experience
and/or by the natural evolution of the art.
1. A sheet metal accumulator (1) of the loop type, adapted to be placed between a unit
feeding the sheet metal (20) and a production line and comprising at least an inlet
group (2), a mobile external turntable (6), an internal fixed turntable (7) coaxial
with the mobile one, a helical path (15) integral to the internal fixed turntable
(7) formed by a plurality of rollers and adjustment means (3, 4; 18) suited to control and to adjust the tension of the
sheet metal (20) when entering into the accumulator (1), and when exiting from said accumulator, the two turntables (6, 7) carrying a plurality
of rolls (8) suited to carry loops of sheet metal, wherein means (3, 12, 13) are provided
for traction-winding loops of sheet metal (20) on the rolls (8) of both turntables
(6, 7) and wherein the rolls (8) of both turntables (6, 7) are mounted on swinging
arms (9) connected one another by tie rods (10) and being movable by hydraulic means
(11).
2. The sheet metal accumulator (1) according to claim 1, characterized in that the operation of the hydraulic means (11) is controlled by a logic unit that controls
also the adjustment means (3) and the mobile turntable (6).
3. The sheet metal accumulator (1) according to claim 1, characterized in that it also comprises an idle traction roll (12) integral to the mobile turntable (6)
and an idle transmission roll (13) integral to the fixed turntable (7).
4. The sheet metal accumulator (1) according to claim 1, characterized in that each of the hydraulic means (11) is adapted to act on the pin of one of the swinging
arms (9), which is mechanically coupled with the pins of the adjacent swinging arms
(9) by means of the tie rods (10).
5. Method for accumulating a sheet metal (20) through a sheet metal accumulator (1) according
to one of claims 1 to 4, characterized by traction-winding the loops of sheet metal on the rolls (8) of the mobile turntable
(6) and of the fixed turntable (7) and in that, during operation, the sheet metal
(20) passes at least through the inlet group (2) and the inlet adjustment means (3,
4) which control and adjust the tension of the sheet metal (20) when entering into the
accumulator (1) before reaching the traction roll (12) of the mobile turntable (6) that, rotating
together with the turntable (6), winds up the entering sheet metal (20) onto the loops
of sheet metal present on the mobile turntable (6) and, at the same time, winds up
onto the loops of sheet metal present on the fixed turntable (7) the sheet metal (20)
coming from the loops of sheet metal in contact with the rolls (8) of the mobile turntable
(6), the sheet metal (20) coming from the fixed turntable (7) and from the helical
path (15) passing underneath the outlet adjustment means (18) which control and adjust the tension of the sheet metal (20) when exiting from the
accumulator before reaching the production line.
6. The method according to claim 5, characterized in that, in order to wind up the sheet metal (20) onto the mobile and the fixed turntables
(6, 7), the mobile turntable (6) starts rotating in a first direction at a first speed
and the traction roll (12), integral to the mobile turntable (6), drives the sheet
metal (20) against the transmission roll (13) of the fixed turntable (7) and then
onto the rolls (8) carried by the mobile turntable (6) and by the fixed turntable
(7) until forming on the two turntables (6, 7) a pre-set number of loops.
7. The method according to claim 6, characterized in that, when the pre-set number of loops have been formed on the two turntables (6, 7),
the mobile turntable (6) and the inlet adjustment means (3) decrease their rotation
speed so that, when the mobile turntable (6) is at a standstill, the quantity of sheet
metal (20) that enters into the accumulator (1) is equal to that exiting to the production
line.
8. The method according to claim 5, characterized in that, when the feeding unit of the sheet metal (20) needs to be changed, the inlet adjustment
means (3) block the incoming sheet metal (20) and the mobile turntable (6) starts
rotating in a direction opposite to the previous one to pay off the loops formed on
the turntables (6, 7) and to feed the production line with the sheet metal (20) stored
in the accumulator (1) and in that, when there is no more sheet metal (20) stored in the accumulator (1), the mobile
turntable (6) returns to the home position and the accumulator (1), if the feeding
of the sheet metal (20) has been restored in the inlet thereof, switches to the "stand-by"
mode and, then, once again winds-up the sheet metal (20) onto the two turntables (6,
7).
1. Schlaufenförmiger Bandmetallspeicher (1), der zur Anordnung zwischen einer Einheit,
die das Bandmetall (20) zuführt, und einer Produktionslinie geeignet ist und zumindest
eine Einlassgruppe (2), einen bewegungsfähigen äußeren Drehtisch (6), einen inneren
starren Drehtisch (7) koaxial mit dem bewegungsfähigen, einen spiralförmigen Weg (15),
der einstückig mit dem inneren starren Drehtisch (7), welcher durch mehrere Rollen
ausgebildet ist, ist, und Anpassungsmittel (3, 4; 18) umfasst, die zum Steuern und
Anpassen der Straffheit des Bandmetalls (20) geeignet sind, wenn es in den Speicher
(1) eintritt und wenn es aus dem Speicher austritt, wobei die zwei Drehtische (6,
7) mehrere Rollen (8) tragen, die dazu geeignet sind, Bandmetallschlaufen zu tragen,
wobei die Mittel (3, 12, 13) zum Wickeln von Schlaufen von Bandmetall (20) unter Zug
auf die Rollen (8) beider Drehtische (6, 7) vorgesehen sind, und wobei die Rollen
(8) beider Drehtische (6, 7) auf Schwenkarmen (9) angebracht sind, die durch Zugstangen
(10) miteinander verbunden sind und durch hydraulische Mittel (11) beweglich sind.
2. Bandmetallspeicher (1) nach Anspruch 1, dadurch gekennzeichnet, dass der Betrieb der hydraulischen Mittel (11) durch eine Logikeinheit gesteuert ist,
die außerdem die Anpassungsmittel (3) und den bewegungsfähigen Drehtisch (6) steuert.
3. Bandmetallspeicher (1) nach Anspruch 1, dadurch gekennzeichnet, dass er außerdem eine leerlaufende Zugrolle (12), die mit dem bewegungsfähigen Drehtisch
(6) einstückig ist, und eine leerlaufende Übertragungsrolle (13) umfasst, die mit
dem starren Drehtisch (7) einstückig ist.
4. Bandmetallspeicher (1) nach Anspruch 1, dadurch gekennzeichnet, dass jedes der hydraulischen Mittel (11) dazu geeignet ist, auf den Zapfen von jedem der
Schwenkarme (9) einzuwirken, der mit den Zapfen der benachbarten Schwenkarme (9) mithilfe
der Zugstangen (10) mechanisch gekuppelt ist.
5. Verfahren zum Speichern eines Bandmetalls (20) über einen Bandmetallspeicher (1) nach
einem der Ansprüche 1 bis 4, gekennzeichnet durch Wickeln der Schlaufen von Bandmetall (20) unter Zug auf die Rollen (8) des bewegungsfähigen
Drehtischs (6) und des starren Drehtischs (7), und dadurch, dass das Bandmetall (20) im Betrieb zumindest durch die Einlassgruppe (2) und die Einlassanpassungsmittel (3, 4) läuft, die die Spannung
des Bandmetalls (20) beim Eintreten in den Speicher (1) steuern und anpassen, bevor
es die Zugrolle (12) des bewegungsfähigen Drehtischs (6) erreicht, die, zusammen mit
dem Drehtisch (6) drehend, das eintretende Bandmetall auf die Bandmetallschlaufen
aufwickelt, welche auf dem bewegungsfähigen Drehtisch (6) vorhanden sind, und gleichzeitig
das Bandmetall (20), das von den Bandmetallschlaufen in Kontakt mit den Rollen (8)
des bewegungsfähigen Drehtischs (6) kommt, auf die Bandmetallschlaufen aufwickelt,
die auf dem starren Drehtisch (7) vorhanden sind, wobei das Bandmetall (20), das von
dem starren Drehtisch (7) und von dem spiralförmigen Weg (15) kommt, unter den Auslassanpassungsmitteln
(18), die die Spannung des Bandmetalls (20) beim Austreten aus dem Speicher steuern
und anpassen, durchläuft, bevor es die Produktionslinie erreicht.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass zum Aufwickeln des Bandmetalls (20) auf den bewegungsfähigen und starren Drehtisch
(6, 7) der bewegungsfähige Drehtisch (6) beginnt, in einer ersten Richtung mit einer
ersten Geschwindigkeit zu drehen, und die Zugrolle (12), die mit dem bewegungsfähigen
Drehtisch (6) einstückig ist, das Bandmetall (20) an die Übertragungsrolle (13) des
starren Drehtischs (7) und dann auf die Rollen (8) treibt, die von dem bewegungsfähigen
Drehtisch (6) und von dem starren Drehtisch (7) getragen sind, bis auf den zwei Drehtischen
(6, 7) eine vorgegebene Anzahl von Schlaufen ausgebildet ist.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass, wenn die vorgegebene Anzahl von Schlaufen auf den zwei Drehtischen (6, 7) ausgebildet
wurde, der bewegungsfähige Drehtisch (6) und die Einlassanpassungsmittel (3) ihre
Drehgeschwindigkeit derart verringern, dass, wenn sich der bewegungsfähige Drehtisch
(6) im Stillstand befindet, die Menge von Bandmetall (20), die in den Speicher (1)
eintritt, gleich jener ist, die aus der Produktionslinie austritt.
8. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass, wenn die Zufuhreinheit für das Bandmetall (20) gewechselt werden muss, die Einlassanpassungsmittel
(3) das ankommende Bandmetall (20) blockieren und der bewegliche Drehtisch (6) beginnt,
in Gegenrichtung zu der vorherigen zu drehen, um die Schlaufen, die auf den Drehtischen
(6, 7) ausgebildet sind, abzuwickeln und die Produktionslinie mit dem Bandmetall (20)
zu versorgen, das in dem Speicher (1) gespeichert ist, und dass, wenn kein Bandmetall
(20) mehr in dem Speicher (1) gespeichert ist, der bewegungsfähige Drehtisch (6) in
die Ausgangsstellung zurückkehrt und der Speicher (1), falls die Zufuhr von Bandmetall
(20) in seinen Einlass wiederhergestellt wurde, in den Bereitschaftsmodus umschaltet
und dann erneut das Bandmetall (20) auf die zwei Drehtische (6, 7) aufwickelt.
1. Accumulateur de bandes métalliques (1) en forme de boucle adapté pour être placé entre
une unité alimentant en bande métallique (20) et une ligne de production et comprenant
au moins un groupe d'entrée (2), une table tournante externe mobile (6), une table
tournante interne fixe (7) coaxiale avec celle qui est mobile, un trajet hélicoïdal
(15) intégral à la table tournante interne fixe (7) formé par une pluralité de rouleaux
et des moyens de réglage (3, 4 ; 18) adaptés pour commander et régler la tension de
la bande métallique (20) lorsqu'elle entre dans l'accumulateur (1) et lorsqu'elle
quitte ledit accumulateur, les deux tables tournantes (6, 7) supportant une pluralité
de rouleaux (8) adaptés pour porter des boucles de bande métallique, dans lequel des
moyens (3, 12, 13) sont prévus pour un enroulement sous traction de boucles de bande
métallique (20) sur les rouleaux (8) des deux tables tournantes (6, 7) et dans lequel
les rouleaux (8) des deux tables tournantes (6, 7) sont montés sur des bras pivotants
(9) reliés l'un à l'autre par des tirants (10) et rendus mobiles par des moyens hydrauliques
(11).
2. Accumulateur de bandes métalliques (1) selon la revendication 1, caractérisé en ce que le fonctionnement des moyens hydrauliques (11) est commandé par une unité logique
qui commande également le moyen de réglage (3) et la table tournante mobile (6).
3. Accumulateur de bandes métalliques (1) selon la revendication 1, caractérisé en ce qu'il comprend également un rouleau de traction inactif (12) intégral à la table tournante
mobile (6) et un rouleau de transmission inactif (13) intégral à la table tournante
fixe (7).
4. Accumulateur de bandes métalliques (1) selon la revendication 1, caractérisé en ce
chacun des moyens hydrauliques (11) est adapté pour agir sur la broche de l'un des
bras pivotants (9) qui est couplé mécaniquement aux broches des bras pivotants adjacents
(9) au moyen des tirants (10).
5. Procédé pour accumuler une bande métallique (20) à travers un accumulateur de bandes
métalliques (1) selon l'une des revendications 1 à 4, caractérisé par l'enroulement sous traction des boucles de bande métallique sur les rouleaux (8)
de la table tournante mobile (6) et de la table tournante fixe (7) et en ce que, pendant
le fonctionnement, la bande métallique (20) passe au moins à travers le groupe d'entrée
(2) et les moyens de réglage de l'entrée (3, 4) qui contrôlent et règlent la tension
de la bande métallique (20) lors de l'entrée dans l'accumulateur (1) avant d'atteindre
le rouleau de traction (12) de la table tournante mobile (6), qui, tournant conjointement
avec la table tournante (6), enroule la bande métallique entrante (20) sur les boucles
de bande métallique présentes sur la table tournante mobile (6) et, parallèlement,
enroule sur les boucles de bande métallique présentes sur la table tournante fixe
(7) les bandes métalliques (20) venant des boucles de bande métallique en contact
avec les rouleaux (8) de la table tournante mobile (6), la bande métallique (20) arrivant
de la table tournante fixe (7) et du trajet hélicoïdal (15) passant sous le moyen
de réglage de la sortie (18) qui contrôle et règle la tension de la bande métallique
(20) lors de la sortie de l'accumulateur avant d'atteindre la ligne de production.
6. Procédé selon la revendication 5, caractérisé en ce qu'afin d'enrouler la bande métallique (20) sur les tables tournantes mobile et fixe
(6, 7), la table tournante mobile (6) commence à tourner dans une première direction
à une première vitesse et le rouleau de traction (12), intégral à la table tournante
mobile (6), entraîne la bande métallique (20) contre le rouleau de transmission (13)
de la table tournante fixe (7) puis sur les rouleaux (8) portés par la table tournante
mobile (6) et par la table tournante fixe (7) jusqu'à former un nombre préréglé de
boucles sur les deux tables tournantes (6, 7).
7. Procédé selon la revendication 6, caractérisé en ce que, lorsque le nombre préréglé de boucles a été formé sur les deux tables tournantes
(6, 7), la table tournante mobile (6) et le moyen de réglage de l'entrée (3) baissent
leur vitesse de rotation de telle façon que lorsque la table tournante mobile (6)
est à l'arrêt, la quantité de bande métallique (20) qui entre dans l'accumulateur
(1) est égale à celle existant dans la ligne de production.
8. Procédé selon la revendication 5, caractérisé en ce que, lorsque l'unité alimentant en bande métallique (20) doit être changée, le moyen
de réglage de l'entrée (3) bloque la bande métallique (20) entrante et la table tournante
mobile (6) commence à tourner dans une direction opposée à la précédente pour dérouler
les boucles formées sur les tables tournantes (6, 7) et pour alimenter la ligne de
production avec la bande métallique (20) stockée dans l'accumulateur (1) et en ce que lorsqu'il n'y a plus de bande métallique (20) stockée dans l'accumulateur (1), la
table tournante mobile (6) retourne à sa position de départ et l'accumulateur (1),
si l'alimentation en bande métallique (20) a été rétablie dans l'entrée de celui-ci,
passe en mode « veille » et puis de nouveau, enroule la bande métallique (20) sur
les deux tables tournantes (6, 7).
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only.
It does not form part of the European patent document. Even though great care has
been taken in compiling the references, errors or omissions cannot be excluded and
the EPO disclaims all liability in this regard.
Patent documents cited in the description