TECHNICAL FIELD
[0001] The present invention relates to the particular technical sector of machines for
automatic working of flat articles, in particular to the movement, for example intermittent,
of hides and similar materials and to the cutting and/or incision thereof in order
to obtain shapes therefrom.
BACKGROUND ART
[0002] In the above-mentioned technical sector, it is very important to keep the hides well-laid-out
and perfectly stretched during the cutting and/or incision operations, performed by
a special mobile cutting unit.
[0003] To this end, the present applicant is the proprietor of a PCT application, PCT/IB2006/001619,
entitled "A Machine for Moving and Automatically Cutting Hides and the Like" (corresponding
to
WO-A-2006/136907).
[0004] This machine, partially illustrated in figure 1, comprises: a fixed plate 1, affording
a series of through-holes, not illustrated, which are connected to a depressed source;
a cutting unit T arranged and operating above the aspirating plate 1; a first ring-wound
conveyor 2, constituted by a belt 20 wound on relative rollers 22A, 22B, respectively
a drive roller and a driven roller, the upper branch 21 of which is arranged such
as to overlie, in proximity, the aspirating fixed plate 1, the belt 20 being provided
with a central region made of a permeable material, destined, as a consequence of
transiting above the plate 1, to be attracted thereby and drag unconstrainedly above
it; a second ring-wound conveyor 3, constituted by a belt 30 made of a permeable material,
such as felt, which is wound on relative idle rollers 32 and the upper branch 31 of
which is destined to restingly receive the hides P in a stretched configuration.
[0005] The second conveyor 3 comprises idle rollers 32 positioned externally of the rollers
22A, 22B of the first conveyor 2, and an upper branch 31 interposed between the cutting
unit T and the upper branch 21 of the first conveyor 2, in proximity thereof. The
upper branch 31 of the second conveyor 3 is destined, together with the hides P stretched
thereon, to be attracted adheringly to and drawn by the upper branch 21 of the first
conveyor 2, consequently to the aspirating action of the plate 1; it transits thus
below the cutting unit T, enabling the cutting unit T to perform the cutting operations
on the hides P stretched thereon, and also represents a protection element of the
central region of the upper branch 21 of the first conveyor 2 and the plate 1 from
the action of the cutting unit T.
[0006] The width of the belt 20 is such as not to project beyond the rollers 22A, 22B; it
is constituted by a heterogeneous material, such as a synthetic textile material,
impregnated with synthetic resin, for example PVC, and is woven such as to identify
a plurality of through-holes.
[0007] Owing to the special characteristics of the material used for the conveyor, it can
happen that during machine functioning the belt does not stay in trim, i.e. it tends
to deviate from the axis thereof.
[0008] Use of rollers provided with guide edges does not solve the problem as the belt tends
to move towards one side, with all the problems that this brings for the movement
thereof and for the automatic cutting of the hides and the like stretched on the belt
of the second conveyor 3.
[0009] The fact that the belt 20, during the functioning of the machine, does not maintain
its initial trim leads to incorrect advancing of the belt 30 of the second conveyor
3 and therefore of the hides resting thereon, as the aspirating action of the plate
is no longer homogeneous on the belt 30 of the second conveyor 3 and therefore on
the hides, damaging the cutting of the hides.
[0010] The present applicant has performed experiments with the aim of finding new technical
solutions aimed at maintaining a predetermined trim of the belt of the first conveyor
with repect to the drive and driven rollers the belt is wound upon, as well as to
reduce both the realisation costs of the belt itself and the times required for setting
it up to work.
DISCLOSURE OF INVENTION
[0011] In this regard an aim of the invention is to provide a machine, of the type described
herein above, which is conformed such as to maintain the correct spatial position
of the belt of the first conveyor over time, independently of the transversal dimensions
thereof.
[0012] A further aim of the present invention is to provide a machine which attains the
preceding aim by means of an easily-assemblable combination of elements which require
only limited maintenance.
[0013] A still further aim of the invention consists in providing a machine in which mounting
and dismounting of the belt of the first conveyor on and from the drive and driven
rollers is simple and rapid.
[0014] A further aim of the present invention consists in providing a machine the costs
of which are relatively contained with respect to the advantages which are provided.
[0015] The above-cited aims are attained, as set out in the content of the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The characteristics of the invention will emerge from the following description,
in which a preferred through not exclusive embodiment of the invention will be illustrated,
with reference to the accompanying figures of the drawings, in which:
figure 1 schematically illustrates, in a frontal view, a part of the machine for moving
and cutting hides and the like of international application PCT/IB2006/001619, described
in the introduction hereto;
figure 2 is an enlarged view of section II-II of figure 1;
figure 3 is an enlarged view of section III-III of figure 1;
figure 4 is a schematic illustration, in frontal view, of a machine for moving and
automatically cutting hides and the like, according to a third embodiment of the present
invention;
figures 5A, 5B illustrate a view in enlarged scale of section V-V of figure 4 in a
first embodiment of the machine of the invention, relating respectively to the mounting
operation of the first conveyor and during the normal functioning of the first conveyor;
figures 5C, 5D illustrate the enlarged-scale view of section V-V of figure 4 in a
second embodiment of the machine of the invention, relating respectively to the mounting
operation of the first conveyor and during the normal functioning of the first conveyor;
figure 6 is an enlarged-scale view of section VI-VI of figure 4;
figure 7 is a schematic plan view in enlarged scale of detail K of figure 6;
figure 8 illustrates a partial perspective view, in a different scale with respect
to the preceding figures, of an important detail of the machine, in a third embodiment
of the machine.
BEST MODE FOR CARRYING OUT THE INVENTION
[0017] During the following description a first (figures 5A, 5B), a second (figures 5C,
5D) and a third (figures 4, 6, 7, 8) embodiments of the machine of the present invention
will be described in order. In particular, the first and second embodiments will refer,
for the sake of simplicity, to figure 4, where the presence of the abutment organs
50 are however to be disregarded, being provided only in the third embodiment of the
invention, as will better emerge from the following description.
[0018] With reference to figures 5A, 5B and figure 4, 100 denotes a machine for moving and
automatically cutting hides and the like. The machine 100 comprises functional parts
already considered in figures 1, 2 and 3, relating to the prior art, and are therefore
used herein with the same identifying numbers.
[0019] The machine 100 comprises: a fixed plate 1, interested by a series of through-holes,
not illustrated, which are connected to a source in depression, also not illustrated;
a cutting unit T arranged and operating above the aspirating plate 1; a first ring-wound
conveyor 2, constituted by a belt 20 wound on relative rollers 22A, 22B, respectively
a drive and a driven roller, an upper branch 21 of which belt 20 is arranged such
as to be superposed above, and in proximity of, the aspirating plate 1, the belt 20
being provided with a central region realised in permeable material, destined, consequently
of the transit thereof above the plate 1, to be attracted by the plate 1 and to drag
without constraint above the plate 1; a second ring-wound conveyor 3, constituted
by a belt 30 made of a permeable material, for example felt, which is wound on relative
idle rollers 32 and an upper branch 31 of which is destined to restingly receive hides
P in a stretched-out configuration.
[0020] The second conveyor 3 comprises idle rollers 32 positioned externally of the rollers
22A, 22B of the first conveyor 2, and an upper branch 31 interposed between the cutting
unit T and the upper branch 21 of the first conveyor 2, in proximity thereof. The
upper branch 31 of the second conveyor 3 is destined, together with the hides P stretched
thereon, to be attracted adheringly and drawn by the upper branch 21 of the first
conveyor 2, in consequence of the aspirating action of the plate 1; thus the upper
branch 31 transits below the cutting unit T, enabling the cutting unit T to perform
the cutting operations on the hides P, and further represents a protection element
of the central region of the upper branch 21 of the first conveyor 2 and of the plate
1 from the action of the cutting unit T.
[0021] The belt 20 has a width such as not to project with edges thereof from the rollers
22A, 22B; the belt 20 is constituted by a heterogeneous material, such as a synthetic
textile, impregnated with a synthetic resin, for example PVC, and is woven such as
to identify a plurality of through-holes at least at the relative central region thereof;
with reference to figure 5A, the belt 20 is further interested, at a relative edge
thereof, by a broadening 250 which develops along the edge and is constituted, for
example: by a fold R of the edge, folded at 180° towards the outside and blocked (for
example glued) to the belt 20 (see detail A); or by an annular strip S, of a stiffer
material than the belt 20, blocked (for example glued) externally to the edge of the
belt (see detail B); or differently it can be obtained by conforming an annular edge
in which a cable that is more rigid than the belt 20 can be inserted. Similar considerations
are valid also for the broadenings 25, 26 that will be introduced in the following
description with reference to the second and third embodiments of the invention.
[0022] Figure 5A illustrates a possible position of the belt 20 consequent to the mounting
thereof on the rollers 22A, 22B (in figure 5A the drive roller is illustrated); consequently
to the functioning of the first conveyor 2, it has been found during experiments that
the upper branch 21 of the belt 20 is subjected to a transversal force T directed
towards the broadening 250, which is annulled only when the broadening 250 is at the
position of the adjacent heads X
1 of the rollers 22A, 22B (see figure 5B). The belt 20 self-positions with respect
to the rollers 22A, 22B, reaching a stable trim during the functioning of the first
conveyor 2. This advantageous technical-functional aspect is manifested in both rotation
directions of the rollers 22A, 22B (and thus the movement of the upper branch 21)
and does not require the axes of the rollers 22A 22B to be maintained parallel.
[0023] The realisation of the belt 20 is also simple and the mounting and dismounting thereof
onto and from the rollers 22A, 22B does not require highly specialised personnel,
all of which has a positive effect on the costs associated to the machine.
[0024] A still further advantage of the present invention consists in having designed a
machine for moving and automatically cutting hides and the like the costs of which
are relatively contained with respect to the advantages obtained, and which is made
up of a combination of elements that are easy to assemble and that require limited
maintenance.
[0025] In the second embodiment of the present invention, see figures 4, 5C, 5D, both the
edges of the belt 20 are interested by broadenings 25, 26, which are conformed in
the same way as the broadening 250 of figures 5A, 5B.
[0026] Figure 5C illustrates a possible position of the belt 20 following mounting thereof
on the rollers 22A, 22B (in this figure the drive roller 22A is shown); following
the activating of the first conveyor 2, experiments have shown that two opposite forces
T
1 and T
2 originate in the upper branch 21 of the belt 20, which forces T
1 and T
2 are respectively directed towards the broadenings 250A, 250B, such as to transversally
stretch the belt 20. It has also been found that one of these forces slightly prevails
over the other, with a consequence that the belt 20 is subjected to a resultant force
that displaces it laterally until one of the broadenings 250A, 250B is positioned
against the corresponding head (in figure 5D the broadening 250A is positioned at
the head X
1); in this position the forces T
1 and T
2 compensate one another, with a consequent annulling of the resultant force, and the
belt 20 thus reaches a stable equilibrium configuration, in which it remains during
the functioning of the machine 100 and in which it is transversally stretched.
[0027] There is, therefore, a stable self-positioning of the belt 20 with respect to the
rollers 22A, 22B and at the same time a permanent transversal stretching of the upper
branch 21 of the belt 20; these advantageous technical-functional aspects are independent
of the movement direction of the belt 20 and are not subordinated to the maintaining
of the parallel situation of the axes of the rollers 22A, 22B.
[0028] The second embodiment retains the above-described advantages of the first embodiment.
[0029] In a third embodiment of the invention, see figures 4, 6, 7, 8, the machine comprises
abutment organs 50, solidly constrained to the frame 80 of the machine 100, for encountering
the internal lateral surfaces 25h, 26h of the broadenings 25, 26 of the belt 20, and
for guiding the belt 20 and keeping it in position with respect to the drive roller
22A and the driven roller 22B of the first conveyor during the functioning thereof.
[0030] In the illustrated example, the abutment organs 50 are provided, for example, in
proximity of the driven roller 22B (but they could also be located, or only located,
at the drive roller 22A, see the part described in a broken line in figure 4) and
are constituted by two identical units 51, 52 which are solidly constrained to the
frame 80 and arranged respectively on opposite sides and laterally with respect to
the belt 20 of the first ring-wound conveyor 2, symmetrically with respect to the
vertical plane of the longitudinal development of the belt 20. Each unit 51, 52 includes
two small plates, a first plate 53 and a second plate 54, facing and close to one
another, and constrained to one another by means for fastening 56, between which plates
53, 54 a peripheral portion of the belt 20 is destined to run, comprising the respective
broadening 25, 26; the first plate 53 exhibits on a more external part thereof an
abutment 55 for contacting the internal lateral surface 25h, 26h of the relative broadening
25, 26. To facilitate the relative sliding of the belt 20 with respect to the fixed
units 51, 52, each abutment 55 exhibits two guides 55h, 55j in inlet and outlet of
the belt 20 into and out of the unit 51, 52 and on the side in which the abutment
55 is destined to meet the corresponding broadening 25, 26.
[0031] The complementary action of the units 51, 52 on the belt 20 ensures correct positioning
of the belt with respect to the rollers 22A, 22B on which the belt is wound; the abutments
55 of the units 51, 52 respectively contact the internal lateral surfaces 25h, 26h
of the broadenings 25, 26, maintaining the belt 20 in position. As can be seen in
figure 6, the reciprocal arrangement of the units 51, 52 in relation to the lateral
dimensions of the belt 20 is such as not to permit lateral displacements of the belt
20 with respect to the winding rollers 22A, 22B during the functioning of the machine
100. Generally speaking, however, the units 51, 52 can be arranged and/or sized such
as to enable limited variations in the position of the belt 20 with respect to the
rollers 22A, 22B; still with reference to figure 6, this state could be obtained by
nearing the units 51, 52 to one another (a solution which is not shown in the figures).
[0032] The suitable mutual arrangement of the units 51, 52 further guarantees the transversal
stretching of the belt 20, thanks to the abutment action exerted by the relative abutments
55 against the broadenings 25, 26, with all the positive implications which this brings
to the correct functioning of the cutting operations on the hides P.
[0033] In the light of the above, the units 51, 52 can be integrated into the machine 100
to impose a definite positioning, for example centred, of the belt 20 with respect
to the winding rollers 22A, 22B, or to function substantially as guide elements of
the belt 20 if the reciprocal arrangement thereof is such as to enable zeroing of
the resultant force originating in the belt 20 (see above); in the first case the
abutments 55 of the units 51, 52 compensate the resultant transversal force of the
opposite forces T
1, T
2, while in the second case the abutments 55 will merely have a guide function. In
both cases the belt 20 maintains its stable spatial trim, with respect to the rollers
22A, 22B on which it is wound, and an optimal transversal stretch; these advantageous
technical-functional aspects are the same for belts of any width, even greater than
150 cm.
[0034] The advantage of the present invention consists in having defined a machine which
fully satisfies the predetermined aims, as it ensures a stable spatial trim of the
belt of the first conveyor and the transversal stretching thereof, with all the positive
implications of this for an optimal and precise hide P cutting operation; the machine
is also functional, reliable and constituted by elements that are easy to assemble.
Advantageously the presence of the abutment and guide organs of the belt 20 of the
first ring-wound conveyor 2 improves the stability thereof during functioning even
for belts wider than 150cm, thus ensuring a predetermined spatial positioning of the
belt 20 with respect to the rollers 22A, 22B on which it is wound, as well as an optimal
transversal stretching of the belt 20 itself. This objective has been attained by
providing abutment and guide organs which are simply conceived, of modest dimensions,
easy to assemble and the reciprocal distance of which, thanks to their constructional
simplicity, can easily be adjusted according to operating requirements (definition
of a degree of play which enables limited transversal displacements of the belt) and
the format of belt used.
[0035] It is stressed that the organs 50, constituted in the illustrated example by a pair
of units 51, 52 which are reciprocally complementary, can be provided, either in addition
or alternatively, at other regions of the first ring-wound conveyor 2, for example
in the central zone of the lower branch, in proximity of the drive roller 22A or on
the upper branch 21; it is further stressed that the organs 50 can alternatively be
constituted by a sole abutment and guide unit of the belt 20, which cooperate to advantageously
increase the stability of the belt 20. All the above-cited variants have not been
represented in the enclosed figures, as they are simple to deduce from the illustrated
embodiment.
[0036] The above has been described by way of non-limiting example, so that any variants
of a practical-applicational nature can be considered to fall within the ambit of
protection sought for the invention as it is described in the following claims.
1. A machine for moving and automatically cutting hides and the like, comprising: an
aspirating plane (1) supplied by a source in depression; a cutting unit (T) arranged
and operating above the aspirating plane (1); a first ring-wound conveyor (2) comprising
a belt (20) made of a permeable material wound on relative rollers (22A, 22B), comprising
a drive roller (22A) and a driven roller (22B), having an upper branch (21) which
is superposed on and in proximity of the aspirating plane (1), the belt (20) being
attracted, during its transit, by the aspirating plane (1), dragging without constraint
above the aspirating plane (1); a second ring-wound conveyor (3), with a relative
belt (30) made of permeable material and wound on idle rollers (32), an upper branch
(31) of which is destined to restingly receive the hides (P) in a stretched-out configuration
and is interposed between the cutting unit (T) and the upper branch (21) of the first
conveyor (2), the machine being characterised in that the belt (20) is not wider than an axial development of the rollers (22A, 22B) and
is interested, at at least an edge thereof, by a corresponding broadening (25, 26,
250A, 250B) developing in a closed ring along the edge.
2. The machine of claim 1, characterised in that both the edges of the belt (20) are interested by relative broadenings (25, 26, 250A,
250B) developing in a closed ring along the edges.
3. The machine of claim 1 or 2, characterised in that it comprises organs (50) which are solidly constrained to the frame (80) of the machine
(100), which organs (50) are abutment organs for each broadening (25, 26) of the belt
(20), which abutment organs guide the belt (20), keeping the belt (20) stably in position
with respect to the drive roller (22A) and the driven roller (22B) of the first ring-wound
conveyor (2).
4. The machine of claim 2, characterised in that it comprises organs (50), which are solidly constrained to the frame (80) of the
machine (100), which organs (50) are provided with abutments (55) for encountering
each broadening (25, 26) at a lateral internal surface (25h, 26h) thereof, which organs
(50) guide the belt (20), keeping the belt (20) stably in position with respect to
the drive roller (22A) and the driven roller (22B) of the first ring-wound conveyor
(2).
5. The machine of claim 4, characterised in that the abutment and guide organs (50) comprise at least two complementary units (51,
52) which are solidly constrained to the frame (80) and which are respectively arranged
on opposite sides and laterally with respect to the belt (20) of the first ring-wound
conveyor (2), each unit (51, 52) comprising two facing plates, a first plate (53)
and a second plane (54), between which a peripheral portion of the belt (20) is destined
to run, which peripheral portion comprises at least one broadening (25, 26), the first
plate (53) being provided with an abutment (55) for encountering the broadening (25,
26) at the internal lateral surface 25h, 26h thereof.
6. The machine of claim 4 or 5, characterised in that each abutment (55) exhibits at least a guide (55h, 55j).
7. The machine of any one of the claims 1 to 5, characterised in that each broadening (25, 26, 250A, 250B) is constituted by a fold (R) of a corresponding
edge of the above belt (20), folded by 180° in an external direction and blocked to
the belt (20).
8. The machine of any one of claims from 1 to 5, characterised in that each broadening (25, 26, 250A, 250B) is defined by an annular strip (S), externally
blocked to the edge of the belt (20), a rigidity of the annular strip being greater
than a rigidity of the belt (20).
9. The machine of any one of claims from 1 to 5, characterised in that each broadening (25, 26, 250A, 250B) is defined by a corresponding annular edge in
which a cable is inserted, the cable being more rigid than the belt (20).
1. Eine Maschine zum Bewegen und automatischen Schneiden von Häuten und Ähnlichem, umfassend:
eine Ansaugebene (1), die durch eine Unterdruckquelle versorgt wird, eine Schneideinheit
(T), die oberhalb der Ansaugebene (1) angeordnet und betrieben wird, einen ersten
ringgewundenen Förderer (2), der ein Band (20) umfasst, das aus einem durchlässigen
Material hergestellt ist, das um jeweilige Rollen (22A, 22B) gewunden ist, der eine
Antriebsrolle (22A) sowie eine angetriebene Rolle (22B) umfasst, der einen oberen
Zweig (21) aufweist, der überlagernd auf und in Nähe der Ansaugebene (1) angeordnet
ist, wobei das Band (20) während seiner Durchfahrt von der Ansaugebene (1) angezogen
wird und der ohne Zwang oberhalb der Ansaugebene (1) schleppt, einen zweiten ringgewundenen
Förderer (3), der ein jeweiliges Band (30) aufweist, das aus einem durchlässigen Material
hergestellt ist und auf Leerlaufrollen (32) gewunden ist, von dem ein oberer Zweig
(31) vorgesehen ist, um ruhend die Häute (P) in einer ausgedehnten Konfiguration zu
empfangen, und der zwischen der Schneideinheit (T) und dem oberen Zweig (21) des ersten
Förderers (2) angeordnet ist, die Maschine ist dadurch gekennzeichnet, dass das Band (20) nicht breiter ist als ein axialer Aufbau der Rollen (22A, 22B) und
an mindestens einem Rand davon durch eine entsprechende Verbreiterung (25, 26, 250A,
250B) geführt ist, die in einem geschlossenen Ring entlang des Rands aufgebaut ist.
2. Die Maschine gemäß Anspruch 1, dadurch gekennzeichnet, dass beide Ränder des Bands (20) durch jeweilige Verbreiterungen (25, 26, 250A, 250A)
geführt sind, die in einem geschlossenen Ring entlang der Ränder aufgebaut sind.
3. Die Maschine gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass sie Organe (50) umfasst, die fest an den Rahmen (80) der Maschine (100) gezwängt
sind, während die Organe (50) Angrenzorgane für jede Verbreiterung (25, 26) des Bands
(20) sind, wobei die Angrenzorgane das Band (20) führen und das Band (20) in Bezug
auf die Antriebsrolle (22A) und die angetriebene Rolle (22B) des ersten ringgewundenen
Förderers (2) stabil in Position halten.
4. Die Maschine gemäß Anspruch 2, dadurch gekennzeichnet, dass sie Organe (50) umfasst, die fest an den Rahmen (80) der Maschine (100) gezwängt
sind, wobei die Organe (50) mit Angrenzungen (55) zum In-Berührung-Kommen mit jeder
Verbreiterung (25, 26) an einer seitlichen inneren Oberfläche (25h, 26h) davon bereitgestellt
sind, während die Organe (50) das Band (20) führen und das Band (20) in Bezug auf
die Antriebsrolle (22A) und die angetriebene Rolle (22B) des ersten ringgewundenen
Förderers (2) stabil in Position halten.
5. Die Maschine gemäß Anspruch 4, dadurch gekennzeichnet, dass die Angrenz- und Führungsorgane (50) mindestens zwei sich ergänzende Einheiten (51,
52) umfassen, die fest an den Rahmen (80) gezwängt sind und jeweils auf entgegengesetzten
Seiten sowie seitlich in Bezug auf das Band (20) des ersten ringgewundenen Förderers
(2) angeordnet sind, wobei jede Einheit (51, 52) zwei sich gegenüberliegende Platten
umfasst, eine erste Platte (53) sowie eine zweite Ebene (54), zwischen denen ein umfänglicher
Bereich des Bands (20) zum Laufen bestimmt ist, wobei der umfängliche Bereich mindestens
eine Verbreiterung (25, 26) umfasst, während die erste Platte (53) mit einer Angrenzung
(55) zum In-Berührung-Kommen mit der Verbreiterung (25, 26) an der inneren seitlichen
Oberfläche (25h, 26h) davon bereitgestellt wird.
6. Die Maschine gemäß Anspruch 4 oder 5, dadurch gekennzeichnet, dass jede Angrenzung (55) mindestens eine Führung (55h, 55j) aufweist.
7. Die Maschine gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass jede Verbreiterung (25, 26, 250A, 250B) durch eine Falz (R) von einem entsprechenden
Rand des oberen Bands (20) erzeugt wird, die um 180° in einer äußeren Richtung gefaltet
ist und an dem Band (20) blockiert ist.
8. Die Maschine gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass jede Verbreiterung (25, 26, 250A, 250B) durch einen ringförmigen Streifen (S) definiert
ist, der außen an dem Rand des Bands (20) geblockt ist, wobei eine Steifigkeit des
ringförmigen Streifens größer ist als eine Steifigkeit des Bands (20).
9. Die Maschine gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass jede Verbreiterung (25, 26, 250A, 250B) durch einen jeweiligen ringförmigen Rand
definiert ist, in den ein Kabel eingesetzt ist, wobei das Kabel steifer ist als das
Band (20).
1. Machine pour déplacer et couper automatiquement des peaux et similaires, comprenant
: un plan d' aspiration (1) alimenté par une source de vide ; une unité de coupe (T)
agencée et fonctionnant au-dessus du plan d'aspiration (1) ; un premier transporteur
en anneau (2) comprenant une courroie (20) réalisée avec un matériau perméable enroulé
sur des rouleaux (22A, 22B) relatifs, comprenant un rouleau d'entraînement (22A) et
un rouleau entraîné (22B) ayant une branche supérieure (21) qui est superposée sur
et à proximité du plan d'aspiration (1), la courroie (20) étant attirée, pendant son
passage, par le plan d'aspiration (1) et traînant sans contrainte au-dessus du plan
d'aspiration (1) ; un deuxième transporteur en anneau (3) avec une courroie (30) relative
réalisée avec un matériau perméable et enroulée sur des galets de guidage (32), dont
une branche supérieure (31) est destinée à recevoir au repos les peaux (P) dans une
configuration étirée et est interposée entre l'unité de coupe (T) et la branche supérieure
(21) du premier transporteur (2), la machine étant caractérisée en ce que la courroie (20) n'est pas plus large qu'un développement axial des rouleaux (22A,
22B) et est concernée, au niveau d'au moins l'un de ses bords, par un élargissement
correspondant (25, 26, 250A, 250B) se développant dans un anneau fermé le long du
bord.
2. Machine selon la revendication 1, caractérisée en ce que les deux bords de la courroie (20) sont concernés par des élargissements (25, 26,
250A, 250B) relatifs se développant dans un anneau fermé le long des bords.
3. Machine selon la revendication 1 ou 2, caractérisée en ce qu'elle comprend des organes (50) qui sont contraints fermement sur le châssis (80) de
la machine (100), lesquels organes (50) sont des organes de butée pour chaque élargissement
(25, 26) de la courroie (20), lesquels organes de butée guident la courroie (20),
maintenant la courroie (20) stable en position par rapport au rouleau d'entraînement
(22A) et au rouleau entraîné (22B) du premier transporteur en anneau (2).
4. Machine selon la revendication 2, caractérisée en ce qu'elle comprend des organes (50) qui sont contraints fermement sur le châssis (80) de
la machine (100), lesdits organes (50) sont équipés de butées (55) pour rencontrer
chaque élargissement (25, 26) au niveau de sa surface interne latérale (25h, 26h),
lesquels organes (50) guident la courroie (20), maintenant la courroie (20) stable
en position par rapport au rouleau d'entraînement (22A) et au rouleau entraîné (22B)
du premier transporteur en anneau (2).
5. Machine selon la revendication 4, caractérisée en ce que les organes de butée et de guidage (50) comprennent au moins deux unités complémentaires
(51, 52) qui sont contraintes fermement sur le châssis (80) et qui sont respectivement
agencées sur des côtés opposés et latéralement par rapport à la courroie (20) du premier
transporteur en anneau (2), chaque unité (51, 52) comprenant deux plaques en vis-à-vis,
une première plaque (53) et une deuxième plaque (54), entre lesquelles une partie
périphérique de la courroie (20) est destinée à passer, laquelle partie périphérique
comprend au moins un élargissement (25, 26), la première plaque (53) étant équipée
d'une butée (55) pour rencontrer l'élargissement (25, 26) au niveau de sa surface
latérale interne (25h, 26h).
6. Machine selon la revendication 4 ou 5, caractérisée en ce que chaque butée (55) présente au moins un guide (55h, 55j).
7. Machine selon l'une quelconque des revendications 1 à 5, caractérisée en ce que chaque élargissement (25, 26, 250A, 250B) est constitué par un pli (R) d'un bord
correspondant de la courroie (20) ci-dessus, plié à 180° dans une direction externe
et bloqué sur la courroie (20).
8. Machine selon l'une quelconque des revendications 1 à 5, caractérisée en ce que chaque élargissement (25, 26, 250A, 250B) est défini par une bande annulaire (S),
bloquée extérieurement sur le bord de la courroie (20), une rigidité de la bande annulaire
étant supérieure à une rigidité de la courroie (20).
9. Machine selon l'une quelconque des revendications 1 à 5, caractérisée en ce que chaque élargissement (25, 26, 250A, 250B) est défini par un bord annulaire correspondant
dans lequel est inséré un câble, le câble étant plus rigide que la courroie (20).