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EP 2 441 533 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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03.04.2013 Bulletin 2013/14 |
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Date of filing: 15.10.2010 |
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International Patent Classification (IPC):
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A tool for stamping workpieces and a method for sorting stamped workpieces
Werkzeug zum Stanzen von Werkstücken und Verfahren zum Sortieren von gestanzten Werkstücken
Outil pour emboutir des pièces et procédé pour trier des pièces embouties
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Designated Contracting States: |
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AL 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 RS SE SI SK SM TR |
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Date of publication of application: |
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18.04.2012 Bulletin 2012/16 |
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Proprietor: Kirchhoff Polska Sp. z o.o. |
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39-300 Mielec (PL) |
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Inventor: |
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- Krupa, Robert
39-203, Nagoszyn (PL)
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Representative: Pawlowski, Adam |
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Eupatent.PL
Al. Kosciuszki 23/25 90-418 Lodz 90-418 Lodz (PL) |
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References cited: :
CN-A- 101 011 716 JP-U- 61 127 834
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JP-U- 57 160 842 US-A1- 2009 200 141
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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] The present invention relates to a tool for stamping workpieces according to the
preamble of claim 1 and a method for sorting workpieces according to the preamble
of claim 10. Such a tool and such a method are, for example, disclosed in document
CN-B-101011716.
[0002] In a typical press station, such a mechanical or a hydraulic press, the stamped workpieces
are fed onto a conveyor belt, via which they are transported for further processing
stages or to transport containers to be provided to a customer. In case workpieces
of different kinds are stamped in one pressing cycle, they may have to be sorted.
[0003] A typical method for sorting workpieces is to sort the workpieces already output
from the press station and placed on the conveyor belt, such as described in a US
patent application
US20090200141A1. It discloses a panel sorting device disposed at a downstream side of a press line
at the transfer conveyor configured to sort the workpieces to two places on a panel
chute for transferring the workpieces. Such device occupies considerable space on
the production line, requiring a transfer conveyor having a length equal at least
to the size of several workpieces.
[0004] In space-constrained applications, it would be advantageous to provide an arrangement
that can separate workpieces which requires less space. The aim of the invention is
to provide such a device.
[0005] The object of the invention is a tool for stamping workpieces from a material moving
cyclically downstream, the tool comprising a die set with a double-workpiece die and
a movable upper plate with a holding plate configured to stamp a first workpiece and
a second workpiece in one working cycle, wherein the working cycle comprises a lowering
phase wherein the holding plate is moved downwards to stamp the workpieces followed
by a lifting phase wherein the holding plate is moved upwards and a feed phase wherein
the material is moved downstream and the workpieces are moved outside the die set,
wherein the tool further comprises a carrier attached to the movable upper plate with
the holding plate, and wherein the die comprises a recess to which a portion of the
carrier can fit during the lifting phase so as to lift the first workpiece above the
second workpiece before the feed phase.
[0006] The carrier may comprise a support arm lowered with respect to the holding plate
and distanced downstream from the holding plate by an arm range, an upwards-tiltable
collector mounted on the support arm and extending upstream from the support arm to
a distance of the arm range and the width of the first workpiece, a guide mounted
on the support arm and extending downstream from the support arm, wherein the upper
surfaces of the collector and of the guide are shaped to form a downwards-inclined
track, on which the first workpiece can slide.
[0007] The collector may comprise a pair of collector arms.
[0008] The guide may comprise a pair of guide arms.
[0009] The carrier may comprise a curved guide configured to rotate the first workpieces.
[0010] The curved guide may have a shape of a brachistochrone curve.
[0011] The carrier can be configured to transport the lifted first workpiece to a first
conveyor belt distinct from a second conveyor belt to which the second workpiece is
fed from the die.
[0012] The first conveyor belt can be placed in line and running in opposite direction than
the second conveyor belt.
[0013] The first conveyor belt can be placed in parallel and next to the second conveyor
belt.
[0014] Another object of the invention is a method for sorting workpieces output from a
tool for stamping workpieces from a material moving cyclically downstream, the tool
comprising a die set with a double-workpiece die and a movable upper plate with a
holding plate configured to stamp a first workpiece and a second workpiece in one
working cycle, wherein the working cycle comprises a lowering phase wherein the holding
plate is moved downwards to stamp the workpieces followed by a lifting phase wherein
the holding plate is moved upwards and a feed phase wherein the material is moved
downstream and the workpieces are moved outside the die set, the method comprising
the step of lifting the first workpiece above the second workpiece with a carrier
before the feed phase.
[0015] The first workpiece can be transported by the carrier to a first conveyor belt distant
from a second conveyor belt to which the second workpiece is fed from the die.
[0016] The object of the invention is shown by means of exemplary embodiment on a drawing,
in which:
Fig. 1 shows the stamping tool configuration at the beginning of the lowering phase;
Fig. 2 shows the stamping tool configuration during the lowering phase;
Fig. 3 shows the stamping tool configuration at the end of the lowering phase;
Fig. 4 shows the stamping tool configuration during the lifting phase;
Fig. 5 shows the stamping tool configuration at the end of the lifting phase;
Fig. 6 shows the stamping tool configuration during the feed phase.
Fig. 7 shows a top view of the stamping tool and conveyor belts in a first arrangement.
Fig. 8 shows a top view of the stamping tool and conveyor belts in a second arrangement.
[0017] The stamping tool according to the invention is shown in different points of its
working cycle on Figs. 1-6. The stamping tool comprises a die set with a double-workpiece
die 111 and a movable upper plate with a holding plate 113 configured to stamp, in
one working cycle, a first workpiece 102 and a second workpiece 103. The double-workpiece
die 111 may, in the single working cycle, press the material 101 in stages progressive
along its movement downstream. The working cycle comprises a lowering phase, as shown
in Figs. 1-3, wherein the holding plate 113 is moved downwards to stamp the workpieces
102, 103. Next, a lifting phase follows, as shown in Figs. 4-5, wherein the holding
plate 113 is moved upwards. Finally, a feed phase occurs as shown in Fig. 6, wherein
the material 101 is moved downstream at a distance equal to the width of the first
and second workpiece 102, 103, and the pressed workpieces 102, 103 are moved outside
the die set.
[0018] A carrier 121 is attached to the movable upper plate with the holding plate 113.
The carrier 121 is configured to separate the position of the first workpiece 102
with respect to the second workpiece 103, thereby sorting the workpieces 102, 103
and allowing feeding of the workpieces 102, 103 to different locations of further
processing stages. For example, the first workpiece 102 can be fed to a first conveyor
belt 132 and the second workpiece 103 can be fed to a second conveyor belt 133, as
shown in Fig. 7.
[0019] The carrier 121 comprises a support arm 122 lowered with respect to the holding plate
113, by a distance not exceeding the distance between the die 111 and the holding
plate 113 at the beginning of the lowering phase, and distanced downstream from the
holding plate 113 by an arm range. An upwards-tiltable collector 123 is mounted on
the support arm 122 and extends upstream from the support arm 122 to a distance of
the arm range and the width of the first workpiece 102. Furthermore, a guide 124 is
mounted on the support arm 122 and extends downstream from the support arm 122. The
upper surfaces of the collector 123 and of the guide 124 are shaped such as to form
a downwards-inclined track, on which the first workpiece 102 can slide, preferably
by its own weight, as shown in fig. 6.
[0020] At the beginning of the lowering phase, as shown in Fig. 1, the support arm 122,
and therefore the collector 123, are located above the die 111. During the lowering
phase, as shown in Fig. 2, the end portion of the collector 123, which is longer than
the arm range, touches the die 111 with the material 101 from which the workpieces
102, 103 are to be formed. During the lowering of the holding plate 113 the movement
of the end portion of the collector 123 is limited by the material 101 on the die
111, which causes tilt of the collector 123 upwards, until the end portion loses contact
with the material 101. The die 111 comprises a recess 114 to which the end portion
of the collector 123 can fit. Therefore, after a consecutive downwards movement of
the holding plate 113, when the end portion of the collector 123 loses contact with
the material 101, the end portion of the collector 123 fits into the recess 114 and
the collector 123 reduces its upwards tilt under its own weight or under a force of
a counter-tilt spring mounted at a pivot joint 125 of the collector 123. Thereby,
at the end of the lowering phase and therefore at the beginning of the lifting phase,
when the workpieces 102, 103 are stamped from the material 101, as shown in Fig. 3,
the end portion of the collector 123 is located in the recess 114 below the first
workpiece 102. During the lifting phase, as shown in Fig. 4, the end portion of the
collector 123 contacts the first workpiece 102 and lifts it upwards. At the end of
the lifting phase, as shown in Fig. 5, the first workpiece 102 is lifted above the
second workpiece 103. The downwards inclination of the collector 123 causes the first
workpiece 102 to slide along the collector 123 and then along the guide 124. During
the feed phase, as shown in Fig. 6, the first workpiece 102 moves along the carrier
121 towards the first conveyor belt 132 and the second workpiece 103 is moved outside
the die set towards the second conveyor belt 133.
[0021] The collector 123 and the guide 124 may have their shapes adapted to the shape of
the first workpiece 102 such as to provide efficient carrying out of the first workpiece
102 from the die set. For example, they may comprise a pair of rod-shaped collector
arms 123A, 123B and a pair of rod-shaped guide arms 124A, 124B.
[0022] The carrier 121 may be shaped to transmit the first workpieces 102 to a conveyor
belt placed in a predefined position.
[0023] For example, as shown in fig. 7, the guide arms 124A, 124B may have a curved shape,
configured to transmit the first workpieces 102 to a first conveyor belt 132 in line
with the second conveyor belt 133, to which the second workpieces 103 are fed, the
conveyor belts 132, 133 moving in opposite directions. The guide arms 124A, 124B may
have a shape of a brachistochrone, which allows transmission of the workpiece in minimum
time, thereby positively impacting the efficiency of production. Moreover, for such
shape of the guide 124 the workpieces may be fed to the same conveyor belt, and their
sorting is effected by the fact that the first workpieces 102 are rotated by the guide
124 by 90 degrees with respect to the second workpieces 103.
[0024] Alternatively, as shown in fig. 8, the guide 124 may have a linear shape, configured
to transmit the first workpieces 102 to a first conveyor belt 142 placed in parallel
and next to the second conveyor belt 143, to which the second workpieces 103 are fed,
the conveyor belts 142, 143 moving in the same direction, as shown in Fig. 8, or in
opposite directions.
1. A tool for stamping workpieces (102, 103) from a material (101) moving cyclically
downstream, the tool comprising:
- a die set with a double-workpiece die (111) and a movable upper plate with a holding
plate (113) configured to stamp a first workpiece (102) and a second workpiece (103)
in one working cycle,
- wherein the working cycle comprises a lowering phase wherein the holding plate (113)
is moved downwards to stamp the workpieces (102, 103) followed by a lifting phase
wherein the holding plate (113) is moved upwards and a feed phase wherein the material
(101) is moved downstream and the workpieces (102, 103) are moved outside the die
set,
characterized in that
- it further comprises a carrier (121) attached to the movable upper plate with the
holding plate (113),
- and wherein the die (111) comprises a recess (114) to which a portion (123) of the
carrier (121) can fit during the lifting phase so as to lift the first workpiece (102)
above the second workpiece (103) before the feed phase.
2. The tool according to claim 1, wherein the carrier (121) comprises
- a support arm (122) lowered with respect to the holding plate (113) and distanced
downstream from the holding plate (113) by an arm range,
- an upwards-tiltable collector (123) mounted on the support arm (122) and extending
upstream from the support arm (122) to a distance of the arm range and the width of
the first workpiece (102),
- a guide (124) mounted on the support arm (122) and extending downstream from the
support arm (122),
- wherein the upper surfaces of the collector (123) and of the guide (124) are shaped
to form a downwards-inclined track, on which the first workpiece (102) can slide.
3. The tool according to claim 2, wherein the collector (123) comprises a pair of collector
arms (123A, 123B).
4. The tool according to claim 2 or 3, wherein the guide (124) comprises a pair of guide
arms (124A, 124B).
5. The tool according to any of claims 2-4, wherein the carrier (121) comprises a curved
guide (124) configured to rotate the first workpieces.
6. The tool according to claim 5, wherein the curved guide (124) has a shape of a brachistochrone
curve.
7. The tool according to any of previous claims, wherein the carrier (121) is configured
to transport the lifted first workpiece (102) to a first conveyor belt (132, 142)
distinct from a second conveyor belt (133, 143) to which the second workpiece (103)
is fed from the die (111).
8. The tool according to claim 7, wherein the first conveyor belt (132) is placed in
line and running in opposite direction than the second conveyor belt (133).
9. The tool according to claim 7, wherein the first conveyor belt (142) is placed in
parallel and next to the second conveyor belt (143).
10. A method for sorting workpieces (102, 103) output from a tool for stamping workpieces
from a material (101) moving cyclically downstream, the tool comprising a die set
with a double-workpiece die (111) and a movable upper plate with a holding plate (113)
configured to stamp a first workpiece (102) and a second workpiece (103) in one working
cycle, wherein the working cycle comprises a lowering phase wherein the holding plate
(113) is moved downwards to stamp the workpieces (102, 103) followed by a lifting
phase wherein the holding plate (113) is moved upwards and a feed phase wherein the
material (101) is moved downstream and the workpieces (102, 103) are moved outside
the die set, characterized in that it comprises the step of lifting the first workpiece (102) above the second workpiece
(103) with a carrier (121) before the feed phase.
11. The method according to claim 10, characterized by transporting the first workpiece (102) by the carrier (121) to a first conveyor belt
(132, 142) distant from a second conveyor belt (133, 143) to which the second workpiece
(103) is fed from the die (111).
1. Werkzeug zum Stanzen von Werkstücken (102, 103) aus einem sich zyklisch stromab bewegenden
Material (101), wobei das Werkzeug umfasst:
- einen Formsatz mit einer Doppel-Werkstückform (111) und einer beweglichen oberen
Platte mit einer Halteplatte (113), konfiguriert, um ein erstes Werkstück (102) und
ein zweites Werkstück (103) in einem Arbeitszyklus zu stanzen,
- worin der Arbeitszyklus eine Absenkphase aufweist, worin die Halteplatte (113) zum
Stanzen der Werkstücke (102, 103) abwärts bewegt wird, gefolgt von einer Hubphase,
worin die Halteplatte (113) aufwärts bewegt wird, und einer Förderphase, worin das
Material (101) stromab bewegt wird und die Werkstücke (102, 103) aus dem Formsatz
heraus bewegt werden,
dadurch gekennzeichnet, dass
- es ferner einen Träger (121) aufweist, der an der beweglichen oberen Platte mit
der Halteplatte (113) angebracht ist,
- und worin die Form (111) eine Vertiefung (114) aufweist, in die ein Abschnitt (123)
des Trägers (121) während der Hubphase eingesetzt werden kann, um vor der Förderphase
das erste Werkstück (102) über das zweite Werkstück (103) anzuheben.
2. Das Werkzeug nach Anspruch 1, worin der Träger (121) umfasst:
- einen Tragarm (122), der in Bezug auf die Halteplatte (113) mit Abstand stromab
von der Halteplatte (113) um eine Armreichweite abgesenkt wird,
- einen aufwärts kippbaren Kollektor (123), der an dem Tragarm (122) angebracht ist
und sich stromauf von dem Tragarm (122) zu einem Abstand der Armreichweite und die
Breite des ersten Werkstücks (102) erstreckt,
- eine Führung (124), die an dem Tragarm (122) angebracht ist und sich stromab von
dem Tragarm (122) erstreckt,
- worin die Oberseiten des Kollektors (123) und der Führung (124) zur Bildung einer
abwärts geneigten Bahn geformt sind, auf der das erste Werkstück (102) gleiten kann.
3. Das Werkzeug nach Anspruch 2, worin der Kollektor (123) ein Paar von Kollektorarmen
(123A, 123B) aufweist.
4. Das Werkzeug nach Anspruch 2 oder 3, worin die Führung (124) ein Paar von Führungsarmen
(124A, 124B) aufweist.
5. Das Werkzeug nach einem der Ansprüche 2 bis 4, worin der Träger (121) eine gekrümmte
Führung (124) aufweist, die konfiguriert ist, um die ersten Werkstücke zu drehen.
6. Das Werkzeug nach Anspruch 5, worin die gekrümmte Führung (124) die Form einer brachistochronen
Kurve hat.
7. Das Werkzeug nach einem der vorhergehenden Ansprüche, worin der Träger (121) konfiguriert
ist, um das angehobene erste Werkstück (102) zu einem ersten Förderband (132, 142)
zu transportieren, das sich von einem zweiten Förderband (133, 143) unterscheidet,
zu dem das zweite Werkstück (103) von der Form (111) gefördert wird.
8. Das Werkstück nach Anspruch 7, worin das erste Förderband (132) zum zweiten Förderband
(133) in Linie und in entgegengesetzter Richtung laufend angeordnet ist.
9. Das Werkzeug nach Anspruch 7, worin das erste Förderband (142) parallel und nächst
dem zweiten Förderband (143) angeordnet ist.
10. Verfahren zum Sortieren von Werkstücken (102, 103), die von einem Werkzeug zum Stanzen
von Werkstücken aus einem sich zyklisch stromab bewegenden Material (101) ausgegeben
werden, wobei das Werkzeug einen Formsatz mit einer Doppel-Werkstückform (111) und
einer beweglichen oberen Platte mit einer Halteplatte (113) umfasst, konfiguriert,
um ein erstes Werkstück (102) und ein zweites Werkstück (103) in einem Arbeitszyklus
zu stanzen, worin der Arbeitszyklus eine Absenkphase aufweist, worin die Halteplatte
(113) zum Stanzen der Werkstücke (102, 103) abwärts bewegt wird, gefolgt von einer
Hubphase, worin die Halteplatte (113) aufwärts bewegt wird, und einer Förderphase,
worin das Material (101) stromab bewegt wird und die Werkstücke (102, 103) aus dem
Formsatz heraus bewegt werden, dadurch gekennzeichnet, dass es den Schritt umfasst, vor der Förderphase das erste Werkstück (102) über das zweite
Werkstück (103) mit einem Träger (121) anzuheben.
11. Das Verfahren nach Anspruch 10, gekennzeichnet durch das Transportieren des ersten Werkstücks (102) mit dem Träger (121) zu einem ersten
Förderband (132, 142) mit Abstand von einem zweiten Förderband (133, 143), zu dem
das zweite Werkstück (103) von der Form (111) gefördert wird.
1. Outil pour emboutir des pièces (102, 103) dans un matériau (101) se déplaçant cycliquement
en aval, l'outil comprenant :
- un ensemble de matrice avec une matrice à double pièce (111) et une plaque supérieure
mobile avec une plaque de retenue (113) configurée pour emboutir une première pièce
(102) et une seconde pièce (103) dans un cycle de travail,
- dans lequel le cycle de travail comprend une phase d'abaissement, dans laquelle
la plaque de retenue (113) est déplacée vers le bas pour emboutir les pièces (102,
103), suivie d'une phase de levage, dans laquelle la plaque de retenue (113) est déplacée
vers le haut et une phase d'alimentation, dans laquelle le matériau (101) est déplacé
en aval et les pièces (102, 103) sont déplacées en dehors de l'ensemble de matrice,
caractérisé en ce que
- il comprend en outre un support (121) fixé sur la plaque supérieure mobile avec
la plaque de retenue (113),
- et dans lequel la matrice (111) comprend un évidement (114), dans lequel une partie
(123) du support (121) peut s'insérer pendant la phase de levage de sorte à lever
la première pièce (102) au-dessus de la seconde pièce (103) avant la phase d'alimentation.
2. Outil selon la revendication 1, dans lequel le support (121) comprend
- un bras support (122) abaissé par rapport à la plaque de retenue (113) et espacé
en aval de la plaque de retenue (113) d'une portée de bras,
- un collecteur inclinable vers le haut (123) monté sur le bras support (122) et s'étendant
en amont du bras support (122) sur une distance de la portée de bras et la largeur
de la première pièce (102),
- un guidage (124) monté sur le bras support (122) et s'étendant en aval de celui-ci,
- dans lequel les surfaces supérieures du collecteur (123) et du guidage (124) sont
formées pour constituer une voie inclinée vers le bas, sur laquelle la première pièce
(102) peut glisser.
3. Outil selon la revendication 2, dans lequel le collecteur (123) comprend une paire
de bras collecteurs (123A, 123B).
4. Outil selon la revendication 2 ou 3, dans lequel le guidage (124) comprend une paire
de bras de guidage (124A, 124B).
5. Outil selon l'une quelconque des revendications 2 à 4, dans lequel le support (121)
comprend un guidage courbé (124) configuré pour faire tourner les premières pièces.
6. Outil selon la revendication 5, dans lequel le guidage courbé (124) présente une forme
de courbe brachistochrone.
7. Outil selon l'une quelconque des revendications précédentes, dans lequel le support
(121) est configuré pour transporter la première pièce levée (102) sur un premier
convoyeur à courroie (132, 142) distinct d'un second convoyeur à courroie (133, 143),
auquel la seconde pièce (103) est fournie depuis la matrice (11).
8. Outil selon la revendication 7, dans lequel le premier convoyeur à courroie (132)
est placé en ligne et s'étend en direction opposée à celle du second convoyeur à courroie
(133).
9. Outil selon la revendication 7, dans lequel le premier convoyeur à courroie (142)
est placé en parallèle et près du second convoyeur à courroie (143).
10. Procédé de tri de pièces (102, 103) sorties d'un outil pour emboutir des pièces dans
un matériau (101) se déplaçant cycliquement en aval, l'outil comprenant un ensemble
de matrice avec une matrice à double pièce (111) et une plaque supérieure mobile avec
une plaque de retenue (113) configurée pour emboutir une première pièce (102) et une
seconde pièce (103) dans un cycle de travail, dans lequel le cycle de travail comprend
une phase d'abaissement, dans laquelle la plaque de retenue (113) est déplacée vers
le bas pour emboutir les pièces (102, 103), suivie d'une phase de levage, dans laquelle
la plaque de retenue (113) est déplacée vers le haut et une phase d'alimentation,
dans laquelle le matériau (101) est déplacé en aval et les pièces (102, 103) sont
déplacées à l'extérieur de l'ensemble de matrice, caractérisé en ce qu'il comprend l'étape de levage de la première pièce (102) au-dessus de la seconde pièce
(103) avec un support (121) avant la phase d'alimentation.
11. Procédé selon la revendication 10, caractérisé par le transport de la première pièce (102) par le support (121) sur un premier convoyeur
à courroie (132, 142) à distance d'un second convoyeur à courroie (133, 143) auquel
la seconde pièce (103) est fournie depuis la matrice (111).
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