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EP0259235A1 - Machine for automatically picking up skins or the like from a pile - Google Patents

Machine for automatically picking up skins or the like from a pile Download PDF

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Publication number
EP0259235A1
EP0259235A1 EP87420226A EP87420226A EP0259235A1 EP 0259235 A1 EP0259235 A1 EP 0259235A1 EP 87420226 A EP87420226 A EP 87420226A EP 87420226 A EP87420226 A EP 87420226A EP 0259235 A1 EP0259235 A1 EP 0259235A1
Authority
EP
European Patent Office
Prior art keywords
suction cup
skin
suction
machine according
head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP87420226A
Other languages
German (de)
French (fr)
Inventor
Gérard Blum
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Charvo SA
Original Assignee
Charvo SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Charvo SA filed Critical Charvo SA
Publication of EP0259235A1 publication Critical patent/EP0259235A1/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B17/00—Details of apparatus or machines for manufacturing or treating skins, hides, leather, or furs
    • C14B17/06—Work feeding or clamping devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/0808—Suction grippers
    • B65H3/0816—Suction grippers separating from the top of pile
    • B65H3/0833—Suction grippers separating from the top of pile and acting on the front part of the articles relatively to the final separating direction
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B1/00—Manufacture of leather; Machines or devices therefor
    • C14B1/62—Winding or stacking hides or leather
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/10—Handled articles or webs
    • B65H2701/17—Nature of material
    • B65H2701/178—Hide, leather or skin

Definitions

  • the present invention relates to machines intended, in the treatment of hides and skins, to automatically take the upper article from a pile in order to bring it to an evacuation conveyor.
  • the skins of the stack are successively removed by their front edge, which is subjected to turbulence generated by the suction effect which is on the other hand incapable of grasping each skin by its central part. It is therefore possible without inconvenience to move the suction cup over a distance long enough to be certain that the shortest skins will in any case be removed by the machine, despite the fact that their free edge is offset from that of the skins the longest.
  • the above remark is valid for skins with a very irregular contour, with a large cut in the central part at the level of which is gripped by the suction cup.
  • the present invention intends to remedy, and this by providing the suction cup with means suitable for mechanically retaining against the perforated wall the edge of the skin which has been removed from the stack by suction effect.
  • the machine shown in fig. 1 comprises two horizontal guides 1 which extend above an evacuation conveyor 2 and inside which a carriage 3 is mounted.
  • the alternating movement of this carriage 3 between the guides 1 is ensured by a pneumatic cylinder or double-acting hydraulic 4, which is not seen in fig. 1 that the movable member fixed to said carriage.
  • the latter is pierced with an opening 3a for mounting a vertical plate 5 forming a support for the cylinder 6 of a pneumatic cylinder which extends vertically below the carriage 3 for operate the vertical movement of the suction cup head 7 of the machine.
  • this head 7 comprises a horizontal sole 8 with a U-shaped section oriented along the axis of the upper guides 1, which sole is made integral with the movable member 6a of the cylinder 6-6a mentioned above.
  • On each of the lateral wings of this sole 8 are articulated two parallel connecting rods 9 which are oriented obliquely and the lower end of which is itself coupled to a corresponding fin 10a secured to the body of a suction cup 10.
  • the four connecting rods 9 thus define two deformable paralleligrams which allow the suction cup 10 to move in the arc of a circle corresponding to the arrow F1, the fins 10a always remaining oriented horizontally.
  • the body of this suction cup 10 has a semi-circular profile with downwardly convexity and an axis oriented perpendicular to the upper guides 1.
  • the part of this body which is turned towards the conveyor 2 is pierced with a series of perforations 10 b (three rows in the embodiment considered), the rest of the wall being full.
  • the interior space of this body is connected to a vacuum source by a flexible pipe 11, the connection between this interior space and the source being controlled by a valve carried by the plate 5; the lever 12 (fig. 1) which actuates this valve is itself controlled by a vertical ramp 13 secured to the sole 8.
  • the upper wall of the body of the suction cup 10 is provided with a horizontal axis 10 c (fig. 2) on which is articulated a frame formed by two flanges 14 which extend parallel to each other between the two pairs of connecting rods 9.
  • This oscillating chassis 14 is connected to the sole 8 by two lateral springs 15 working in traction, which thus tend to balance the weight in overhang of the suction cup 10. It will be noted in this connection that the movement of this suction cup under the effect or against the springs 15 is limited by a stop 16 which joins the two rear connecting rods 9 transversely to one another and which is arranged between the latter and the two front connecting rods 9 .
  • a pneumatic cylinder double-acting material intended for controlling a clamp mechanism.
  • the cylinder 17 of this jack is articulated in 14a at the front of the chassis 14, while the movable member 17a is hitched to a lever 18 pivotally carried by the chassis 14.
  • the free end of this lever 18 is equipped with a transverse bar 19 intended to come to bear against the perforated front part of the suction cup 10 by actuating the jack 17-17a at extension and thus to form jaws for the skin removed by the latter, in the manner which will be explained later.
  • the skins to be sampled are stacked on the plate 20 (fig. 3) of a movable table of the usual type, said plate 20 being associated with a control mechanism shown diagrammatically at 21, capable of ensuring its progressive elevation as the sampling operations, so that the upper skin of the stack is always located at the same level.
  • the machine comprises a horizontal drum 22 (fig. 1) placed immediately to the right of the inlet of the evacuation conveyor 2 and driven in continuous rotation. With this drum 22 are associated pressure rollers 23 carried by the pivoting arms 24 that springs 25 tend to tilt elastically to apply said rollers against the periphery of the aforementioned drum.
  • the arms 24 are articulated on a tilting frame 26, the raising and lowering of which are controlled by a pneumatic cylinder 27.
  • fig. 3 shows the carriage 3 at its rearmost position.
  • the cylinder 6-6a was actuated so that the head 7 is lowered and so that the springs 15 apply elastically the suction cup 10 against the stack A, well behind the front edge of the latter.
  • the rollers 23 are in the lowered position, while the clamp mechanism 17-18-19 is in the open position and the pipe 11 (and consequently the interior space of the suction cup 10) is connected to the vacuum source.
  • the jack 4 is controlled by contraction so as to advancing the movable head 7 along the arrow F2 of fig. 4, and it is only when the suction cup 10, which as a result of the deformability of its suspension faithfully follows the more or less irregular upper profile of the stack A, arrives in the vicinity of the anterior edge of the upper skin that by effect of turbulence said edge is sucked against the perforated front part of said suction cup.
  • a depressiometer associated with the vacuum source immediately detects the change in pressure caused by the closure of the perforations 10b by the raised edge of the skin a thus captured, and actuates on the one hand the jack 27 to the extension in order to raise the frame 26 and the rollers 23, on the other hand the jack 17-17a to the extension, so that the clamp mechanism closes and the bar 19 comes to apply the aforementioned raised edge against the perforated part of the suction cup 10
  • the skin a thus removed can no longer detach inadvertently from the suction cup.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Manipulator (AREA)
  • Soil Working Implements (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Abstract

A la ventouse (10) établie à un profil semi-cylindrique qui n'est perforé qu'au niveau de sa partie avant tournée en direction du transporteur d'évacuation (2), afin de ne saisir que le bord antérieur de chacune des peaux de la pile, est associé un mécaniqme de pince (19) qui est commandé par un vérin pneumatique de manière à maintenir le bord antérieur de la peau prélevée par succion appliqué contre la partie perforée.To the suction cup (10) established with a semi-cylindrical profile which is only perforated at the level of its front part facing towards the evacuation conveyor (2), so as to grip only the front edge of each of the skins of the stack, is associated a clamp mechanism (19) which is controlled by a pneumatic cylinder so as to maintain the anterior edge of the skin removed by suction applied against the perforated part.

Description

La présente invention a trait aux machines destinées, dans le traitement des cuirs et peaux, à prélever de manière automatique l'article supé­rieur d'une pile afin de l'amener à un transporteur d'évacuation.The present invention relates to machines intended, in the treatment of hides and skins, to automatically take the upper article from a pile in order to bring it to an evacuation conveyor.

On sait que les machines de ce type font le plus souvent appel à des ventouses de succion qui sont fixées sur une tête mobile animée d'un déplacement alternatif par rapport à la pile des peaux à traiter, de façon à ce que lors du mouvement d'avance la peau supérieure de la pile soit prélevée par aspiration pour être amenée au transporteur, la ven­touse reculant ensuite pour opérer le prélèvement de la peau suivante.It is known that machines of this type most often use suction cups which are fixed on a movable head animated by an alternative movement relative to the pile of skins to be treated, so that during the movement of 'Advance the upper skin of the stack is removed by suction to be brought to the carrier, the suction cup then retreating to operate the removal of the next skin.

Or la pratique démontre que le fonctionnement des machines de ce genre est très imparfait, en ce sens qu'il arrive de manière relativement fréquente que la ventouse ne saississe aucune peau sur la pile, ou au contraire qu'elle en prélévè simultanément deux à la fois. Ces défauts de fonctionnement résultent du fait que les peaux ne présentant pas une épaisseur régulière en tous points de leur surface et que par ailleurs leur contour est lui-même très irrégulier, de telle sorte que la préhen­sion par la ventouse s'effectue finalement de façon assez erratique.However practice shows that the functioning of machines of this kind is very imperfect, in the sense that it happens relatively frequently that the suction cup does not get any skin on the pile, or on the contrary that it simultaneously takes two from the time. These malfunctions result from the fact that the skins do not have a regular thickness at all points of their surface and that, moreover, their contour is itself very irregular, so that the gripping by the suction cup is finally carried out quite erratic.

Aussi a-t-on proposé (voir à ce sujet FR-A-599 427 MARIONOI et GB-A-21 112/2909 VICKERY) d'équiper la tête mobile de la machine d'une ventouse de succion établie à un profil semi-cylindrique à convexité tournée vers le bas et à axe orienté perpendiculairement à la direction de déplacement, laquelle ventouse n'est perforée que sur sa partie diri­gée vers l'avant lors du mouvement d'avance.It has therefore been proposed (see on this subject FR-A-599 427 MARIONOI and GB-A-21 112/2909 VICKERY) to equip the movable head of the machine with a suction cup established with a semi profile -cylindrical with convexity turned downwards and with an axis oriented perpendicular to the direction of movement, which suction cup is only perforated on its part directed forwards during the advance movement.

On comprend que grâce à cette disposition particulière, les peaux de la pile sont successivement prélevées par leur bord antérieur, lequel est soumis aux turbulences engendrées par l'effet de succion qui est par contre incapable de saisir chaque peau par sa partie centrale. On peut donc sans inconvénient déplacer la ventouse sur une distance suffisamment longue pour être certain que les peaux les plus courtes seront en tout étant de cause prélevées par la machine, en dépit du fait que leur bord libre se trouve décalé par rapport à celui des peaux les plus longues. La remarque qui précède est valable pour les peaux présentant un contour très irrégulier, avec une large découpe dans la partie centrale au niveau de laquelle s'effectue la préhension par la ventouse.It is understood that thanks to this particular arrangement, the skins of the stack are successively removed by their front edge, which is subjected to turbulence generated by the suction effect which is on the other hand incapable of grasping each skin by its central part. It is therefore possible without inconvenience to move the suction cup over a distance long enough to be certain that the shortest skins will in any case be removed by the machine, despite the fact that their free edge is offset from that of the skins the longest. The above remark is valid for skins with a very irregular contour, with a large cut in the central part at the level of which is gripped by the suction cup.

Il convient cependant d'observer que si un tel agencement assure bien un prélèvement initial convenable, il peut arriver que par suite du profil bombé de la paroi inférieure de la ventouse et de la localisation des perforations ménagées dans cette paroi, l'effet de succion se révèle in­suffisant pour opérer le déplacement longitudinal de la peau, notamment lorsque celle-ci adhère de manière importante à celle qui est située immédiatement au-dessous de la première. En pareil cas la peau prélevée par la ventouse échappe à celle-ci et n'est pas entraînée, en donnant lieu à un défaut de fonctionnement.It should however be observed that if such an arrangement does ensure a suitable initial sampling, it may happen that as a result of the curved profile of the lower wall of the suction cup and the location of the perforations formed in this wall, the suction effect proves to be insufficient to effect the longitudinal displacement of the skin, in particular when the latter adheres significantly to that which is located immediately below the former. In such a case, the skin removed by the suction cup escapes from it and is not entrained, giving rise to a malfunction.

C'est à cet inconvénient qu'entend remédier la présente invention, et ce en dotant la ventouse de moyens propres à retenir mécaniquement contre la paroi perforée le bord de la peau qui a été prélevée sur la pile par effet de succion.It is to this drawback that the present invention intends to remedy, and this by providing the suction cup with means suitable for mechanically retaining against the perforated wall the edge of the skin which has been removed from the stack by suction effect.

La machine suivant l'invention est définie à la revendication 1.The machine according to the invention is defined in claim 1.

Le dessin annexé, donné à titre d'exemple, permettra de mieux comprendre l'invention, les caractéristiques qu'elle présente et les avantages qu'elle est susceptible de procurer :

  • Fig. 1 est une vue en perspective montrant l'agencement général d'une machine de prélèvement établie conformément à l'invention.
  • Fig. 2 est une coupe verticale à plus grande échelle de la tête mobile de la machine suivant fig. 1.
  • Fig. 3 à 6 sont des vues de côté illustrant de manière schématique le fonctionnement de cette machine.
The appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing:
  • Fig. 1 is a perspective view showing the general arrangement of a sampling machine established in accordance with the invention.
  • Fig. 2 is a vertical section on a larger scale of the movable head of the machine according to FIG. 1.
  • Fig. 3 to 6 are side views schematically illustrating the operation of this machine.

La machine représentée en fig. 1 comprend deux guides horizontaux 1 qui s'étendent au-dessus d'un transporteur d'évacuation 2 et à l'intérieur desquels est monté un chariot 3. Le déplacement alternatif de ce chariot 3 entre les guides 1 est assuré par un vérin pneumatique ou hydraulique 4 à double effet, dont on n'aperçoit en fig. 1 que l'organe mobile fixé audit chariot. Ce dernier est percé d'une ouverture 3ª pour le montage d'une platine verticale 5 formant support pour le cylindre 6 d'un vérin pneumatique qui s'étend verticalement au-dessous du chariot 3 pour opérer le déplacement vertical de la tête porte-ventouse 7 de la machine.The machine shown in fig. 1 comprises two horizontal guides 1 which extend above an evacuation conveyor 2 and inside which a carriage 3 is mounted. The alternating movement of this carriage 3 between the guides 1 is ensured by a pneumatic cylinder or double-acting hydraulic 4, which is not seen in fig. 1 that the movable member fixed to said carriage. The latter is pierced with an opening 3ª for mounting a vertical plate 5 forming a support for the cylinder 6 of a pneumatic cylinder which extends vertically below the carriage 3 for operate the vertical movement of the suction cup head 7 of the machine.

Comme plus particulièrement montré en fig. 2, cette tête 7 comprend une semelle horizontale 8 à section en forme de U orientée suivant l'axe des guides supérieurs 1, laquelle semelle est rendue solidaire de l'organe mobile 6ª du vérin 6-6ª sus-mentionné. Sur chacune des ailes latérales de cette semelle 8 s'articulent deux bielles parallèles 9 qui sont orientées obliquement et dont l'extrémité inférieure est elle-même attelée à une ailette correspondante 10ª solidaire du corps d'une ven­touse de succion 10. On conçoit que les quatre bielles 9 définissent ainsi deux paralléligrammes déformables qui permettent à la ventouse 10 de se déplacer suivant l'arc-de-cercle correspondant à la flèche F1, les ailettes 10ª restant toujours orientées horizontalement.As more particularly shown in fig. 2, this head 7 comprises a horizontal sole 8 with a U-shaped section oriented along the axis of the upper guides 1, which sole is made integral with the movable member 6ª of the cylinder 6-6ª mentioned above. On each of the lateral wings of this sole 8 are articulated two parallel connecting rods 9 which are oriented obliquely and the lower end of which is itself coupled to a corresponding fin 10ª secured to the body of a suction cup 10. It will be understood that the four connecting rods 9 thus define two deformable paralleligrams which allow the suction cup 10 to move in the arc of a circle corresponding to the arrow F1, the fins 10ª always remaining oriented horizontally.

En section verticale le corps de cette ventouse 10 présente un profil semi-circulaire à convexité tournée vers le bas et à axe orienté perpen­diculairement aux guides supérieurs 1. La partie de ce corps qui est tournée en direction du transporteur 2 est percée d'une série de perfo­rations 10b (trois rangées dans l'exemple de réalisation considéré), le reste de la paroi étant plein. L'espace intérieur de ce corps est relié à une source de dépression par une canalisation flexible 11, la liaison entre cet espace intérieur et la source étant commandée par une vanne portée par la platine 5 ; le levier 12 (fig. 1) qui actionne cette vanne est lui-même commandé par une rampe verticale 13 solidaire de la semelle 8.In vertical section, the body of this suction cup 10 has a semi-circular profile with downwardly convexity and an axis oriented perpendicular to the upper guides 1. The part of this body which is turned towards the conveyor 2 is pierced with a series of perforations 10 b (three rows in the embodiment considered), the rest of the wall being full. The interior space of this body is connected to a vacuum source by a flexible pipe 11, the connection between this interior space and the source being controlled by a valve carried by the plate 5; the lever 12 (fig. 1) which actuates this valve is itself controlled by a vertical ramp 13 secured to the sole 8.

La paroi supérieure du corps de la ventouse 10 est munie d'un axe horizontal 10c (fig. 2) sur lequel s'articule un châssis formé par deux flasques 14 qui s'étendent parallèlement l'un à l'autre entre les deux paires de bielles 9. Ce châssis oscillant 14 est relié à la semelle 8 par deux ressorts latéraux 15 travaillant à la traction, qui tendent ainsi à équilibrer le poids en porte-à-faux de la ventouse 10. On notera à ce sujet que le déplacement de cette ventouse sous l'effet ou à l'en­contre des ressorts 15 est limité par une butée 16 qui réunit transver­salement l'une à l'autre les deux bielles arrière 9 et qui est disposée entre ces dernières et les deux bielles antérieures 9.The upper wall of the body of the suction cup 10 is provided with a horizontal axis 10 c (fig. 2) on which is articulated a frame formed by two flanges 14 which extend parallel to each other between the two pairs of connecting rods 9. This oscillating chassis 14 is connected to the sole 8 by two lateral springs 15 working in traction, which thus tend to balance the weight in overhang of the suction cup 10. It will be noted in this connection that the movement of this suction cup under the effect or against the springs 15 is limited by a stop 16 which joins the two rear connecting rods 9 transversely to one another and which is arranged between the latter and the two front connecting rods 9 .

Suivant l'invention, à l'intérieur du châssis 14 est logé un vérin pneu­ matique à double effet, destiné à la commande d'un mécanisme de pince. Le cylindre 17 de ce vérin est articulé en 14ª à l'avant du châssis 14, tandis que l'organe mobile 17ª vient s'atteler à un levier 18 porté à pivotement par le châssis 14. L'extrémité libre de ce levier 18 est équipée d'une barrette transversale 19 destinée à venir s'appliquer contre la partie antérieure perforée de la ventouse 10 moyennant action­nement du vérin 17-17ª à l'extension et à former ainsi mors pour la peau prélevée par celle-ci, à la manière qui sera exposée plus loin.According to the invention, inside the chassis 14 is housed a pneumatic cylinder double-acting material, intended for controlling a clamp mechanism. The cylinder 17 of this jack is articulated in 14ª at the front of the chassis 14, while the movable member 17ª is hitched to a lever 18 pivotally carried by the chassis 14. The free end of this lever 18 is equipped with a transverse bar 19 intended to come to bear against the perforated front part of the suction cup 10 by actuating the jack 17-17ª at extension and thus to form jaws for the skin removed by the latter, in the manner which will be explained later.

Les peaux à prélever sont empilées sur le plateau 20 (fig. 3) d'une table mobile de type usuel, ledit plateau 20 étant associé à un mécanis­me de commande schématisé en 21, propre à assurer son élévation progres­sive au fur et à mesure des opérations de prélèvement, de façon à ce que la peau supérieure de l'empilage soit toujours située au même niveau. En avant de cette table 20-21, la machine comprend un tambour horizontal 22 (fig. 1) disposé immédiatement au droit de l'entrée du transporteur d'évacuation 2 et entraîné en rotation continue. A ce tambour 22 sont associés des galets presseurs 23 portés par les bras pivotants 24 que des ressorts 25 tendent à faire basculer élastiquement pour appliquer lesdits galets contre la périphérie du tambour précité. Les bras 24 sont articulés sur un bâti basculant 26 dont l'élévation et l'abaissement sont commandés par un vérin pneumatique 27.The skins to be sampled are stacked on the plate 20 (fig. 3) of a movable table of the usual type, said plate 20 being associated with a control mechanism shown diagrammatically at 21, capable of ensuring its progressive elevation as the sampling operations, so that the upper skin of the stack is always located at the same level. In front of this table 20-21, the machine comprises a horizontal drum 22 (fig. 1) placed immediately to the right of the inlet of the evacuation conveyor 2 and driven in continuous rotation. With this drum 22 are associated pressure rollers 23 carried by the pivoting arms 24 that springs 25 tend to tilt elastically to apply said rollers against the periphery of the aforementioned drum. The arms 24 are articulated on a tilting frame 26, the raising and lowering of which are controlled by a pneumatic cylinder 27.

Pour exposer le fonctionnement de la machine au cours d'un cycle complet correspondant au prélèvement d'une peau, c'est-à-dire à la peau supé­rieure de la pile A disposée sur le plateau 20, on se reportera tout d'abord à fig. 3 qui montre le chariot 3 à sa position la plus arrière. Le vérin 6-6ª a été actionné de façon à ce que la tête 7 soit abaissée et à ce que les ressorts 15 appliquent élastiquement la ventouse 10 con­tre la pile A, bien en arrière du bord antérieur de celle-ci. Les galets 23 sont en position abaissée, tandis que le mécanisme de pince 17-18-19 est à la position ouverte et la canalisation 11 (et en conséquence l'espace intérieur de la ventouse 10) est reliée à la source de dépression.To expose the operation of the machine during a complete cycle corresponding to the removal of a skin, that is to say to the upper skin of the stack A disposed on the plate 20, we will first refer to fig. 3 which shows the carriage 3 at its rearmost position. The cylinder 6-6ª was actuated so that the head 7 is lowered and so that the springs 15 apply elastically the suction cup 10 against the stack A, well behind the front edge of the latter. The rollers 23 are in the lowered position, while the clamp mechanism 17-18-19 is in the open position and the pipe 11 (and consequently the interior space of the suction cup 10) is connected to the vacuum source.

En dépit du fait que la dépression s'exerce à travers les perforations 10ª en créant un effet de succion à travers celles-ci, la peau supé­rieure n'est pas aspirée, par suite de l'orientation de ces perforations 10b vers l'avant. Le vérin 4 est commandé à la contraction de façon à faire avancer la tête mobile 7 suivant la flèche F2 de fig. 4, et ce n'est que lorsque la ventouse 10, qui par suite de la déformabilité de sa suspension suit fidèlement le profil supérieur plus ou moins irrégu­lier de la pile A, arrive au voisinage du bord antérieur de la peau su­périeure que par effet de turbulence ledit bord est aspiré contre la partie antérieure perforée de ladite ventouse.In spite of the fact that the depression is exerted through the 10ª perforations by creating a suction effect through these, the upper skin is not sucked, due to the orientation of these perforations 10 b towards the before. The jack 4 is controlled by contraction so as to advancing the movable head 7 along the arrow F2 of fig. 4, and it is only when the suction cup 10, which as a result of the deformability of its suspension faithfully follows the more or less irregular upper profile of the stack A, arrives in the vicinity of the anterior edge of the upper skin that by effect of turbulence said edge is sucked against the perforated front part of said suction cup.

Un dépressiomètre associé à la source de dépression détecte immédiate­ment la modification de pression engendrée par l'obturation des perfora­tions 10b par le bord relevé de la peau ª ainsi saisie, et actionne d'une part le vérin 27 à l'extension afin de relever le bâti 26 et les galets 23, d'autre part le vérin 17-17ª à l'extension, si bien que le mécanisme de pince se ferme et que la barrette 19 vient appliquer le bord relevé précité contre la partie perforée de la ventouse 10. La peau ª ainsi prélevée ne peut plus se détacher intempestivement de la ven­touse.A depressiometer associated with the vacuum source immediately detects the change in pressure caused by the closure of the perforations 10b by the raised edge of the skin ª thus captured, and actuates on the one hand the jack 27 to the extension in order to raise the frame 26 and the rollers 23, on the other hand the jack 17-17ª to the extension, so that the clamp mechanism closes and the bar 19 comes to apply the aforementioned raised edge against the perforated part of the suction cup 10 The skin ª thus removed can no longer detach inadvertently from the suction cup.

Le chariot 3 continuant son avance, cette peauª est entraînée en direc­tion du transporteur 2 en passant par dessus le tambour tournant 22. Dès que la tête 7 a dépassé ce tambour (fig. 5), le vérin 27, actionné sous l'effet de palpeurs convenablement disposés, abaisse le bâti 26 en pres­sant les galets 23 contre la peauª au droit du tambour précité. Le vérin 17-17ª est lui-même commandé à la contraction, de sorte que la barrette 19 s'écarte de la ventouse 10. A partir de ce moment c'est le transporteur d'évacuation 2 qui prend en charge le déplacement de la peauª ; la tête 7 peut en conséquence être relevée par le vérin 6-6ª (fig. 6), ce qui a pour effet de commander le levier de vanne 12 par la rampe 11 et de faire cesser la dépression dans la ventouse 10. La peauª ainsi libérée peut être évacuée et le chariot 3 être ramené (flèche F3) à son point de départ suivant fig. 3, tandis que le bâti 26 et les galets 23 restent à la position basse pour faciliter l'évacuation de la peau.The carriage 3 continuing its advance, this skin is driven in the direction of the conveyor 2 by passing over the rotating drum 22. As soon as the head 7 has passed this drum (fig. 5), the jack 27, actuated under the effect of probes suitably arranged, lowers the frame 26 by pressing the rollers 23 against the skinª in line with the aforementioned drum. The jack 17-17ª is itself controlled by contraction, so that the bar 19 moves away from the suction cup 10. From this moment it is the evacuation conveyor 2 which takes charge of the movement of the skinª; the head 7 can therefore be raised by the cylinder 6-6ª (fig. 6), which has the effect of controlling the valve lever 12 by the ramp 11 and to stop the depression in the suction cup 10. The skinª thus released can be evacuated and the carriage 3 be returned (arrow F3) to its starting point according to fig. 3, while the frame 26 and the rollers 23 remain in the low position to facilitate the evacuation of the skin.

Les essais ont démontré que le fonctionnement de la machine ne donnait lieu à aucun défaut, en ce sens que toutes les peaux de la pile A, quels que soient les irrégularités qui affectent leurs dimensions respectives et leur contour et l'effet d'adhérence, sont successivement prélevées et entraînées une par une, sans aucun collage intempestif de deux peaux superposées ni détachement inopiné de la peau initialement prélevée par la ventouse.Tests have shown that the operation of the machine does not give rise to any defect, in the sense that all the skins of stack A, whatever the irregularities which affect their respective dimensions and their contour and the effect of adhesion, are successively removed and driven one by one, without any untimely sticking of two superposed skins or unexpected detachment of the skin initially removed by the suction cup.

Claims (6)

1. Machine pour le prélèvement automatique de peaux à partir d'une pile, du genre comprenant une tête mobile (7) qui est déplacée alternative­ment par rapport à la pile (A) et qui est équipée d'une ventouse de succion (10) propre, lors de l'avance de la tête, à saisir par aspira­tion la peau supérieure (ª) et à l'entraîner vers un transporteur d'évacuation (2), puis à reculer pour revenir à la position avancée de prélèvement, laquelle ventouse est établie à un profil substantielle­ment semi-cylindrique à convexité tournée vers le bas et à axe orienté perpendiculairement à la direction de déplacement de la tête (7), tandis que les perforations (10b) pratiquées dans la paroi convexe de cette ventouse n'intéressent que la partie de cette paroi qui est tournée vers l'avant au cours du mouvement d'avance, afin que la peau supérieure (ª) de la pile (A) soit prélevée par son bord antérieur au cours du mouve­ment d'avance de la tête au-dessus de la pile, caractérisée en ce qu'à la ventouse (10) est associé un mécanisme basculant de pince (17-18-19) propre à serrer et à retenir contre la partie perforée de celle-ci le bord de la peau supérieure (ª) qui a été saisi par aspiration.1. Machine for the automatic removal of skins from a pile, of the type comprising a movable head (7) which is moved alternately relative to the pile (A) and which is equipped with a suction cup (10) clean, when advancing the head, to grab the upper skin by suction (ª) and to drag it towards an evacuation conveyor (2), then to move back to return to the advanced position of sampling, which suction cup is established with a substantially semi-cylindrical profile with downwardly convexity and an axis oriented perpendicular to the direction of movement of the head (7), while the perforations ( 10b ) formed in the convex wall of this suction cup are of interest that the part of this wall which is turned forwards during the advance movement, so that the upper skin (ª) of the stack (A) is removed by its anterior edge during the advance movement of the head above the pile, characterized in that at the suction cup (10) is associated a tilting gripper mechanism (17-18-19) suitable for clamping and retaining against the perforated part thereof the edge of the upper skin (ª) which has been gripped by suction. 2. Machine suivant la revendication 1, caractérisée en ce que le méca­nisme de pince est placé sous la dépendance d'un dépressiomètre qui détecte la modification de la pression d'aspiration consécutive à l'ap­plication du bord de la peau (ª) contre la partie perforée de la ventouse (10).2. Machine according to claim 1, characterized in that the clamp mechanism is placed under the dependence of a depressiometer which detects the modification of the suction pressure following the application of the edge of the skin (ª) against the perforated part of the suction cup (10). 3. Machine suivant l'une quelconque des revendication 1 et 2, caractéri­sée en ce que la ventouse (10) est suspendue à la tête mobile (7) par un système de parallèlogramme déformable (9-9) associé à des moyens élas­tiques (15), afin que ladite ventouse soit maintenue horizontalement appliquée contre la peau supérieure (ª) en dépit du profil supérieur plus ou moins irrégulier de la pile (A).3. Machine according to any one of claims 1 and 2, characterized in that the suction cup (10) is suspended from the movable head (7) by a deformable parallelogram system (9-9) associated with elastic means (15 ), so that said suction cup is kept horizontally applied against the upper skin (ª) despite the more or less irregular upper profile of the stack (A). 4. Machine suivant la revendication 3, caractérisée en ce que la tête mobile (7) comprend une semelle (8) qui est reliée au corps de la ven­touse (10) par deux paires de bielles obliques (9) tandis que les moyens élastiques sont constitués par des ressorts (15) interposés entre ladite semelle (8) et un châssis oscillant (14) porté à pivotement par la ventouse.4. Machine according to claim 3, characterized in that the movable head (7) comprises a sole (8) which is connected to the body of the suction cup (10) by two pairs of oblique connecting rods (9) while the means elastic consist of springs (15) interposed between said sole (8) and an oscillating frame (14) pivotally carried by the suction cup. 5. Machine suivant la revendication 4, caractérisée en ce que le châssis basculant est formé par deux flasques (14) entre lesquels est logé le vérin (17-17ª) qui assure la commande du mécanisme de pince.5. Machine according to claim 4, characterized in that the tilting frame is formed by two flanges (14) between which is housed the jack (17-17ª) which controls the clamp mechanism. 6. Machine suivant l'une quelconque des revendications 1 à 5, caracté­risée en ce qu'en avant du transporteur d'évacuation (2) est disposé un tambour tournant (22) surmonté de galets presseurs (23) appliqués élas­tiquement contre la périphérie du tambour précité, ces galets étant portés par un bâti basculant (26) associé à des moyens de commande (27) qui permettent le relevage desdits galets lors du passage du bord anté­rieur de la peau (ª) au-dessus du tambour précité.6. Machine according to any one of claims 1 to 5, characterized in that in front of the evacuation conveyor (2) is disposed a rotating drum (22) surmounted by pressure rollers (23) applied elastically against the periphery of the aforementioned drum, these rollers being carried by a tilting frame (26) associated with control means (27) which allow the lifting of said rollers during the passage of the anterior edge of the skin (ª) above the aforementioned drum.
EP87420226A 1986-09-02 1987-08-27 Machine for automatically picking up skins or the like from a pile Withdrawn EP0259235A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8612452A FR2603264B1 (en) 1986-09-02 1986-09-02 MACHINE FOR AUTOMATICALLY TAKING SKINS OR THE LIKE FROM A BATTERY
FR8612452 1986-09-02

Publications (1)

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EP0259235A1 true EP0259235A1 (en) 1988-03-09

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EP87420226A Withdrawn EP0259235A1 (en) 1986-09-02 1987-08-27 Machine for automatically picking up skins or the like from a pile

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EP (1) EP0259235A1 (en)
FR (1) FR2603264B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVR20130053A1 (en) * 2013-03-01 2014-09-02 Bergi S P A MACHINE FOR LOADING NATURAL SKINS ON MEANS OF CONVEYORS
IT201700019415A1 (en) * 2017-02-21 2018-08-21 Omac Srl Device for loading two-dimensional artifacts in a machine for their processing.
IT202200024606A1 (en) * 2022-11-29 2024-05-29 Cea Brevetti Spa APPARATUS FOR HANDLING FLEXIBLE LAMINAR ELEMENTS

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2704642B1 (en) * 1993-04-27 1995-07-13 Centre Tech Cuir Chaussure DEVICE FOR DETECTING THE EDGES OF OBJECTS OF LOW THICKNESS, AND ITS APPLICATION TO AN APPARATUS FOR GRIPPING SUCH OBJECTS.
CN115535668B (en) * 2022-10-31 2025-07-15 怀化天马隆旭印务有限公司 Printing paper conveying device

Citations (8)

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Publication number Priority date Publication date Assignee Title
DE114872C (en) *
GB190921112A (en) * 1909-09-15 1910-07-28 Frederick William Vickery Improvements in or connected with Machines for Feeding or Separating Sheets of Paper and the like.
FR599427A (en) * 1925-05-28 1926-01-12 Marinoni Machines Et Materiel Pneumatic device for separating sheets into piles
FR715918A (en) * 1930-04-24 1931-12-11 Addressograph Co Sheet feeder for address printing machines
DE582549C (en) * 1933-08-16 Faber & Schleicher A G Suction nozzle with an uneven suction surface
DE1193519B (en) * 1962-04-28 1965-05-26 Josef Mueller Device for lifting the top sheet of a stack of paper with the help of pneumatic suction devices
FR2096176A5 (en) * 1970-06-10 1972-02-11 Turner Maschinenfabrik Unstacking device - for piles of animal hides and skins
FR2297794A1 (en) * 1975-01-20 1976-08-13 Gauthier Pierre Henri Automatic unstacking machine for animal skins - with surface rumbling to admit air between layers to assist sliding of each skin

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE114872C (en) *
DE582549C (en) * 1933-08-16 Faber & Schleicher A G Suction nozzle with an uneven suction surface
GB190921112A (en) * 1909-09-15 1910-07-28 Frederick William Vickery Improvements in or connected with Machines for Feeding or Separating Sheets of Paper and the like.
FR599427A (en) * 1925-05-28 1926-01-12 Marinoni Machines Et Materiel Pneumatic device for separating sheets into piles
FR715918A (en) * 1930-04-24 1931-12-11 Addressograph Co Sheet feeder for address printing machines
DE1193519B (en) * 1962-04-28 1965-05-26 Josef Mueller Device for lifting the top sheet of a stack of paper with the help of pneumatic suction devices
FR2096176A5 (en) * 1970-06-10 1972-02-11 Turner Maschinenfabrik Unstacking device - for piles of animal hides and skins
FR2297794A1 (en) * 1975-01-20 1976-08-13 Gauthier Pierre Henri Automatic unstacking machine for animal skins - with surface rumbling to admit air between layers to assist sliding of each skin

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVR20130053A1 (en) * 2013-03-01 2014-09-02 Bergi S P A MACHINE FOR LOADING NATURAL SKINS ON MEANS OF CONVEYORS
IT201700019415A1 (en) * 2017-02-21 2018-08-21 Omac Srl Device for loading two-dimensional artifacts in a machine for their processing.
IT202200024606A1 (en) * 2022-11-29 2024-05-29 Cea Brevetti Spa APPARATUS FOR HANDLING FLEXIBLE LAMINAR ELEMENTS
WO2024116081A1 (en) * 2022-11-29 2024-06-06 Brevetti C.E.A. S.P.A Handling apparatus to move flexible laminar elements

Also Published As

Publication number Publication date
FR2603264A1 (en) 1988-03-04
FR2603264B1 (en) 1989-03-24

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