EP0421114B1 - Attachment of a tool for ejecting or separating parts or for a similar tool - Google Patents

Attachment of a tool for ejecting or separating parts or for a similar tool Download PDF

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Publication number
EP0421114B1
EP0421114B1 EP90116328A EP90116328A EP0421114B1 EP 0421114 B1 EP0421114 B1 EP 0421114B1 EP 90116328 A EP90116328 A EP 90116328A EP 90116328 A EP90116328 A EP 90116328A EP 0421114 B1 EP0421114 B1 EP 0421114B1
Authority
EP
European Patent Office
Prior art keywords
tie bar
tool
guide
axis
regard
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.)
Expired - Lifetime
Application number
EP90116328A
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German (de)
French (fr)
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EP0421114A1 (en
Inventor
Marcel Yerly
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.)
Bobst Mex SA
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Bobst SA
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Filing date
Publication date
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Priority to AT90116328T priority Critical patent/ATE99215T1/en
Publication of EP0421114A1 publication Critical patent/EP0421114A1/en
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Publication of EP0421114B1 publication Critical patent/EP0421114B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B26D7/1818—Means for removing cut-out material or waste by pushing out
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B26D2007/1872—Means for removing cut-out material or waste using breakaway pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B26D2007/189—Mounting blanking, stripping and break-out tools
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T225/00—Severing by tearing or breaking
    • Y10T225/30—Breaking or tearing apparatus
    • Y10T225/329—Plural breakers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/929—Tool or tool with support
    • Y10T83/9457—Joint or connection
    • Y10T83/9473—For rectilinearly reciprocating tool
    • Y10T83/9483—Adjustable
    • Y10T83/9486—Rectilinearly

Definitions

  • the present invention relates to a device for fixing an ejection tool, separation of blanks or the like, on the adjustable crosspieces of a station for ejecting waste or separating blanks in a sheet-working machine.
  • the fixing device of the kind defined in the preamble of claim 1, is known, for example, from patent DE-C-2815797.
  • a waste ejection station of a sheet-working machine for example a press for cutting cardboard sheets intended for packaging
  • a sheet-working machine for example a press for cutting cardboard sheets intended for packaging
  • the cut sheet is placed above an openwork plate whose various openings are located exactly below the cutouts made in the sheet. These cuts must be separated from the sheet, as they are not part of the finished product.
  • the cutouts are brought into contact with ejectors which have the function of acting on the cutout so as to detach it completely from the sheet and to push or eject it through the corresponding opening of the plate openwork.
  • the sheets generally contain a large number of wastes to be ejected and that, consequently, the upper and lower frames will be equipped with a corresponding number of ejection tools, sometimes up to a hundred or more. .
  • the fixing device does not constitute an assembly that can be easily mounted on the crosspieces because, the fact that the jaws can rotate independently of one another on the tie rod and, thus, do not have their parallel bearing surface at the crossbar guide surface, makes mounting difficult.
  • the screw forming the tie may be insufficiently screwed in the case of locking. In the event that the screw is inadvertently too unscrewed during the displacement operation, the jaws may escape from the crosspiece. The assembly / disassembly must be carried out almost necessarily using two hands.
  • the fixing device is at an angle to the longitudinal direction of the cross member.
  • vibrations will tend to straighten the device. This straightening will lead to a reduction in the tightening preload and, therefore, a fall of the device which can cause serious damage to the installation.
  • the proposed solution has the advantage of easily putting and maintaining each fixing device in the state capable of performing one of the three operations mentioned above.
  • the fixing device comprises a tie rod 6 in the form of a rod provided, at a first end, with a head 13.
  • a support 4 of the ejection device 5, 26 support coming up against in the direction of the head 13, a first guide in the form of a jaw 1 in pressure contact with the support 4, a second guide or jaw in the form of a jaw 2, a resilient element in the form of a resilient sleeve 8 and a washer 9 made of metal.
  • Clamping means 10 of the tie rod 6, mounted on the second end of the tie rod 6, are intended to push, with more or less force towards the head 13, all of the elements mounted to slide on the tie rod 6.
  • the head 13 of the pulling 6 penetrates inside a T-shaped groove 16 of the support 4, so as to allow a longitudinal and rotational movement of the support 4 relative to the jaw 1.
  • the jaw 1 and the jaw 2 are each provided with 'at least a first bearing surface 1a, 2a intended to come into contact with two longitudinal guides of the crossmember 3 movable on one of the two movable frames (not shown) of the ejection station.
  • the profile of the bearing surface 1a of the jaw 1 has the shape of a V.
  • the ejection tool consists of a hollow cylindrical body 5 in which engages, in free sliding, the rear part d 'an ejection needle 26.
  • the jaw 1 comprises an extension 1d oriented in the direction of the jaw 2.
  • the extension 1d is provided with an opening 1f to let pass the tie rod 6 in free sliding, and with a second surface d support 1e intended to come into contact with a second support surface 2e of the jaw 2.
  • the jaw 2 is provided with a guide pin 12 engaged with a groove 14 made in the extension 1d of the jaw 1 to prevent that the jaw 1 and the jaw 2 cannot turn on the tie rod 6 independently of one another.
  • the jaw 1 has, on its extension 1d, a third bearing surface 1g essentially parallel to the axis of the tie rod 6 and intended to come into contact with the longitudinal guide surface of the cross member 3.
  • the clamping means 10 of the tie rod 6 consist of a lever in the form of a rotary cam 10 whose axis of rotation 11 is fixedly mounted on the second end of the tie rod 6 and perpendicular to the axis of the latter.
  • the cam 10 is composed of two identical parts, parallel and symmetrically situated with respect to the axis of the tie rod 6.
  • the action surface of each cam part 10 is in contact with the washer 9 and comprises three successive rectilinear portions A, B, C connected together by rounded portions, and distant from the axis of rotation 11 by a length respectively L respectivement, L2, L3, with L1 ⁇ L2 ⁇ L3.
  • the cam 10 can be driven in rotation using a key 26, retractable or not, engaged with a groove 15 made in the cam 10.
  • the function of the cam 10 is to vary the contact pressure, on the one hand, between the various elements mounted to slide on the tie rod 6 and, on the other hand, between the bearing surfaces 1a, 2a, 1g of the jaw 1 and of the jaw 2 and the guide surfaces of the cross member 3, in order to allow the fixing device to carry out one of the three operations in question, namely assembly / disassembly, displacement or locking. From FIG. 1, the operation of the cam 10 is easy to understand. When the surface B is in contact with the washer 9, the elements in question are slightly in pressure against each other, to the point that a relative movement between them becomes possible. The surface B therefore corresponds to the displacement operation. When cam 10 is turned clockwise, the surface C will come into contact with the washer 9.
  • the resilient sleeve 8 facilitates the passage of the cam 10 from one position to another and performs any backlash.
  • the resilient sleeve 8 can be replaced by any other similar element, for example spring washers.
  • a compression spring 17 mounted on the tie rod 6 which tends to separate the jaw 1 and the jaw 2 from one another.
  • the head 13 of the tie rod 6 can be constituted by a nut engaged with a thread of the rod forming the tie rod 6 or any other element fixedly mounted, retractable or not, on the first end of the tie rod 6.
  • the cam 10 which serves as a lever can have its axis of rotation 11 perpendicular to the axis of the tie rod.
  • a kind of clamping lever other than that of the cam can be envisaged.
  • the fixing device described above in relation to the ejection tool, can be used in the case of fixing a pressing tool, a guide tool, a blanking tool or the like, in a waste ejection or blanking station.
  • the fastening device described above perfectly resolves the risk of a reduction in the pre-tensioning of the jaws on the crosspiece of the station in question, a reduction caused by mounting the device at an angle on the crosspiece, thanks to the resilient element 8 which allows a straightening of the device, while maintaining the prestressing at little close to its original value.
  • the resilient element 8 which allows a straightening of the device, while maintaining the prestressing at little close to its original value.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Scissors And Nippers (AREA)
  • Knives (AREA)
  • Processing Of Solid Wastes (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Coating Apparatus (AREA)
  • Clamps And Clips (AREA)
  • Automatic Assembly (AREA)
  • Details Of Cutting Devices (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Adornments (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)

Abstract

A fastening device for securing a tool on an adjustable crossbar of a waste stripping and blank separating station of a sheet processing machine includes a tie bar provided with a headed end which receives a support for the tool part, a pair of clamping jaws, each of which is provided with a supporting surface designed to enter in contact with the crossbar of the stripping station and have additional supporting surfaces designed to enter into contact with one another. The second end of the tie bars carries a tightening arrangement which provides three positions including a substantial release of pressure on the jaws to enable fixing and dismantling of the tool, an intermediate amount of pressure on the jaws to allow shifting of the arrangement along the crossbar and a third amount of pressure which provides a tightening or locking of the tool in a given position on the crossbar.

Description

La présente invention concerne un dispositif de fixation d'un outil d'éjection, de séparation des poses ou outil similaire, sur les traverses réglables d'une station d'éjection des déchets ou de séparation des poses dans une machine à travailler des feuilles.The present invention relates to a device for fixing an ejection tool, separation of blanks or the like, on the adjustable crosspieces of a station for ejecting waste or separating blanks in a sheet-working machine.

Le dispositif de fixation, du genre défini dans le préambule de la revendication 1, est connu, par exemple, du brevet DE-C-2815797.The fixing device, of the kind defined in the preamble of claim 1, is known, for example, from patent DE-C-2815797.

Dans une station d'éjection des déchets d'une machine travaillant des feuilles, par exemple une presse de découpage de feuilles de carton destinées à l'emballage, il est connu de placer la feuille découpée au-dessus d'une plaque ajourée dont les diverses ouvertures sont situées exactement au-dessous des découpes effectuées dans la feuille. Ces découpes doivent être séparées de la feuille, car elles ne font pas partie du produit fini. Pour cela, les découpes sont amenées en contact avec des éjecteurs qui ont pour fonction d'agir sur la découpe de manière à la détacher complètement de la feuille et de la pousser ou de l'éjecter au travers de l'ouverture correspondante de la plaque ajourée.In a waste ejection station of a sheet-working machine, for example a press for cutting cardboard sheets intended for packaging, it is known to place the cut sheet above an openwork plate whose various openings are located exactly below the cutouts made in the sheet. These cuts must be separated from the sheet, as they are not part of the finished product. For this, the cutouts are brought into contact with ejectors which have the function of acting on the cutout so as to detach it completely from the sheet and to push or eject it through the corresponding opening of the plate openwork.

Plusieurs solutions ont, jusqu'à ce jour, été proposées pour placer chaque éjecteur en face de la découpe correspondante. Par exemple, selon le brevet DE-C-2158907, dans la station d'éjection des déchets de la presse de découpage, les éjecteurs sont montés de façon à être déplaçables sur les traverses, elles-mêmes déplaçables sur deux cadres situés au-dessus et au-dessous de la table ajourée sur laquelle est placée la feuille découpée, afin de pouvoir être placés en fonction de la position des découpes à éjecter.To date, several solutions have been proposed for placing each ejector in front of the corresponding cut. For example, according to patent DE-C-2158907, in the waste ejection station of the cutting press, the ejectors are mounted so as to be displaceable on the crosspieces, themselves displaceable on two frames located above and below the perforated table on which the cut sheet is placed, so that it can be placed depending on the position of the cutouts to be ejected.

Il faut souligner que les feuilles comportent, généralement, un grand nombre de déchets à éjecter et que, par conséquent, les cadres supérieur et inférieur leront équipés d'un nombre correspondant d'outils d'éjection, parfois jusqu'à une centaine et plus.It should be emphasized that the sheets generally contain a large number of wastes to be ejected and that, consequently, the upper and lower frames will be equipped with a corresponding number of ejection tools, sometimes up to a hundred or more. .

Dans le brevet DE-C-2815797, deux possibilités de déplacement relatif, à savoir celui du support d'éjecteur par rapport à deux guides sous forme de mordaches et celui des guides (ou mordaches) par rapport à la traverse, permettent de positionner exactement l'aiguille d'éjection en face de la découpe. Il est à remarquer que ce genre de fixation, qui a l'avantage de permettre, par une seule action sur la tête de vis, d'agir simultanément sur deux déplacements relatifs, a déjà simplifié le positionnement des éjecteurs en question. Toutefois, étant donné le nombre très important d'éjecteurs par station d'éjection, l'opération de positionnement des éjecteurs reste fastidieuse puisque l'opérateur doit, à l'aide d'une clé, visser plus ou moins chaque vis, suivant qu'il veut effectuer l'une des trois opérations de montage/démontage, déplacement ou verrouillage. La détermination exacte du degré de vissage de la vis pour pouvoir effectuer l'une des trois opérations n'est évidemment pas aisée et exige beaucoup de temps lorsqu'il s'agit de positionner une centaine d'éjecteurs. A cela, s'ajoute d'autres inconvénients. Par exemple, le dispositif de fixation ne constitue pas un ensemble aisément montable sur les traverses car, le fait que les mordaches puissent tourner indépendamment l'une de l'autre sur le tirant et, ainsi, ne pas avoir leur surface d'appui parallèle à la surface de guidage de la traverse, rend le montage malaisé. La vis formant le tirant peut être insuffisamment vissée dans le cas du verrouillage. Dans le cas où la vis est, par inadvertance, trop dévissée lors de l'opération de déplacement, les mordaches peuvent s'échapper de la traverse. Le montage/démontage doit s'effectuer presque nécessairement à l'aide des deux mains.In patent DE-C-2815797, two possibilities of relative displacement, namely that of the ejector support with respect to two guides in the form of jaws and that of the guides (or jaws) with respect to the crosspiece, make it possible to position exactly the ejection needle in front of the cutout. It should be noted that this kind of fixing, which has the advantage of allowing, by a single action on the screw head, to act simultaneously on two relative displacements, has already simplified the positioning of the ejectors in question. However, given the very large number of ejectors per ejection station, the ejector positioning operation remains tedious since the operator must, using a wrench, screw more or less each screw, depending on whether 'he wants to carry out one of the three assembly / disassembly, displacement or locking operations. The exact determination of the degree of tightening the screw to be able to perform one of the three operations is obviously not easy and requires a lot of time when it comes to positioning a hundred ejectors. To this are added other drawbacks. For example, the fixing device does not constitute an assembly that can be easily mounted on the crosspieces because, the fact that the jaws can rotate independently of one another on the tie rod and, thus, do not have their parallel bearing surface at the crossbar guide surface, makes mounting difficult. The screw forming the tie may be insufficiently screwed in the case of locking. In the event that the screw is inadvertently too unscrewed during the displacement operation, the jaws may escape from the crosspiece. The assembly / disassembly must be carried out almost necessarily using two hands.

Il peut arriver qu'après verrouillage sur la traverse, le dispositif de fixation soit de biais par rapport à la direction longitudinale de la traverse. Lors du fonctionnement de la machine, les vibrations auront tendance à redresser le dispositif. Ce redressement entraînera une diminution de la précontrainte de serrage et, ainsi, une chute du dispositif qui peut provoquer de graves détériorations à l'installation.It may happen that after locking on the cross member, the fixing device is at an angle to the longitudinal direction of the cross member. During the operation of the machine, vibrations will tend to straighten the device. This straightening will lead to a reduction in the tightening preload and, therefore, a fall of the device which can cause serious damage to the installation.

Il arrive aussi qu'un monteur, pressé de verrouiller en position le grand nombre d'éjecteurs, spécialement dans le cas d'une machine à haute performance, agisse avec trop de force sur la vis de serrage du dispositif de fixation et provoque ainsi une rupture de certains éléments. Pour éviter ce danger, un contrôle de la force de serrage est nécessaire.It also happens that a fitter, pressed to lock the large number of ejectors in position, especially in the case of a high performance machine, acts with too much force on the clamping screw of the fixing device and thus causes a rupture of certain elements. To avoid this danger, a check of the clamping force is necessary.

La solution au problème posé est donnée par le dispositif de fixation défini dans la revendication 1.The solution to the problem posed is given by the fixing device defined in claim 1.

La solution proposée a l'avantage de mettre et de maintenir aisément chaque dispositif de fixation dans l'état susceptible de réaliser l'une des trois opérations mentionnées ci-dessus. D'autre part, il s'est avéré qu'il était avantageux d'avoir tous les dispositifs simultanément dans le même état d'opération. Ceci peut être aisément réalisé en choisissant la même position pour les moyens de serrage de tous les dispositifs de fixation. En principe, toutes ces opérations peuvent s'effectuer d'une seule main, très rapidement, sans attention particulière et sans qualification ou connaissance spécifique, ceci avec une sécurité de fonctionnement égale, sinon supérieure, à l'art antérieur.The proposed solution has the advantage of easily putting and maintaining each fixing device in the state capable of performing one of the three operations mentioned above. On the other hand, it turned out that it was advantageous to have all the devices simultaneously in the same operating state. This can be easily achieved by choosing the same position for the clamping means of all the fixing devices. In principle, all these operations can be carried out with one hand, very quickly, without particular attention and without qualification or specific knowledge, this with operating safety equal, if not superior, to the prior art.

En référence au dessin annexé, il sera maintenant décrit, à titre d'exemple, un mode de réalisation préféré de l'invention, dans lequel :

  • la figure 1 représente un coupe longitudinale schématique au travers du dispositif de fixation en prise avec la traverse déplaçable d'une station d'éjection,
  • la figure 2 représente une vue de profil selon la figure 1.
With reference to the appended drawing, a preferred embodiment of the invention will now be described, by way of example, in which:
  • FIG. 1 represents a schematic longitudinal section through the fixing device engaged with the movable cross member of an ejection station,
  • FIG. 2 represents a profile view according to FIG. 1.

Le dispositif de fixation comprend un tirant 6 sous forme de tige munie, a une première extrémité, d'une tête 13. Sur le tirant 6 sont montés successivement, en coulissement libre, un support 4 du dispositif d'éjection 5, 26, support venant buter en direction de la tête 13, un premier guide sous forme de mordache 1 en contact de pression avec le support 4, un deuxième guide ou mordache en forme de mâchoire 2, un élément résilient sous forme de douille résiliente 8 et une rondelle 9 en métal. Des moyens de serrage 10 du tirant 6, montés sur la deuxième extrémité du tirant 6, sont destinés à pousser, avec plus ou moins de force en direction de la tête 13, tous les éléments montés coulissant sur le tirant 6. La tête 13 du tirant 6 pénètre à l'intérieur d'une rainure 16 en forme de T du support 4, de manière à autoriser un déplacement longitudinal et rotationnel du support 4 par rapport à la mordache 1. La mordache 1 et la mâchoire 2 sont chacune munie d'au moins une première surface d'appui 1a, 2a destinée à venir en contact avec deux guides longitudinaux de la traverse 3 déplaçable sur l'un des deux cadres mobiles (non représentés) de la station d'éjection. Le profil de la surface d'appui 1a de la mordache 1 a la forme d'un V. L'outil d'éjection est constitué d'un corps cylindrique creux 5 dans lequel s'engage, en coulissement libre, la partie arrière d'une aiguille d'éjection 26. La mordache 1 comprend un prolongement 1d orienté en direction de la mâchoire 2. Le prolongement 1d est muni d'une ouverture 1f pour laisser passer le tirant 6 en coulissement libre, et d'une deuxième surface d'appui 1e destinée à venir en contact avec une deuxième surface d'appui 2e de la mâchoire 2. La mâchoire 2 est munie d'un ergot de guidage 12 en prise avec une rainure 14 faite dans le prolongement 1d de la mordache 1 pour empêcher que la mordache 1 et la mâchoire 2 ne puisse tourner sur le tirant 6 indépendamment l'une de l'autre. La mordache 1 possède, sur son prolongement 1d, une troisième surface d'appui 1g essentiellement parallèle à l'axe du tirant 6 et destinée à venir en contact avec la surface longitudinale de guidage de la traverse 3.The fixing device comprises a tie rod 6 in the form of a rod provided, at a first end, with a head 13. On the tie rod 6 are successively mounted, in free sliding, a support 4 of the ejection device 5, 26, support coming up against in the direction of the head 13, a first guide in the form of a jaw 1 in pressure contact with the support 4, a second guide or jaw in the form of a jaw 2, a resilient element in the form of a resilient sleeve 8 and a washer 9 made of metal. Clamping means 10 of the tie rod 6, mounted on the second end of the tie rod 6, are intended to push, with more or less force towards the head 13, all of the elements mounted to slide on the tie rod 6. The head 13 of the pulling 6 penetrates inside a T-shaped groove 16 of the support 4, so as to allow a longitudinal and rotational movement of the support 4 relative to the jaw 1. The jaw 1 and the jaw 2 are each provided with 'at least a first bearing surface 1a, 2a intended to come into contact with two longitudinal guides of the crossmember 3 movable on one of the two movable frames (not shown) of the ejection station. The profile of the bearing surface 1a of the jaw 1 has the shape of a V. The ejection tool consists of a hollow cylindrical body 5 in which engages, in free sliding, the rear part d 'an ejection needle 26. The jaw 1 comprises an extension 1d oriented in the direction of the jaw 2. The extension 1d is provided with an opening 1f to let pass the tie rod 6 in free sliding, and with a second surface d support 1e intended to come into contact with a second support surface 2e of the jaw 2. The jaw 2 is provided with a guide pin 12 engaged with a groove 14 made in the extension 1d of the jaw 1 to prevent that the jaw 1 and the jaw 2 cannot turn on the tie rod 6 independently of one another. The jaw 1 has, on its extension 1d, a third bearing surface 1g essentially parallel to the axis of the tie rod 6 and intended to come into contact with the longitudinal guide surface of the cross member 3.

Les moyens de serrage 10 du tirant 6 sont constitués d'un levier sous forme de came 10 rotative dont l'axe de rotation 11 est monté de façon fixe sur la deuxième extrémité du tirant 6 et perpendiculairement à l'axe de ce dernier. La came 10 est composée de deux parties identiques, parallèles et symétriquement situées par rapport à l'axe du tirant 6. La surface d'action de chaque partie de came 10 est en contact avec la rondelle 9 et comprend trois portions rectilignes successives A, B, C reliées entre elles par des portions arrondies, et distantes de l'axe de rotation 11 d'une longueur respectivement L₁, L₂, L₃, avec L₁ < L₂ < L₃. La came 10 peut être entraînée en rotation à l'aide d'une clé 26, escamotable ou non, en prise avec une rainure 15 faite dans la came 10. La came 10 a pour fonction de faire varier la pression de contact, d'une part, entre les divers éléments montés coulissant sur le tirant 6 et, d'autre part, entre les surfaces d'appui 1a, 2a, 1g de la mordache 1 et de la mâchoire 2 et les surfaces de guidage de la traverse 3, afin de permettre au dispositif de fixation de réaliser l'une des trois opérations en question, à savoir montage/démontage, déplacement ou verrouillage. A partir de la figure 1, le fonctionnement de la came 10 est aisé à comprendre. Quand la surface B est en contact avec la rondelle 9, les éléments en question sont légèrement en pression l'un contre l'autre, au point qu'un mouvement relatif entre eux devient possible. La surface B correspond donc à l'opération de déplacement. Quand la came 10 est tournée dans le sens des aiguilles d'une montre, la surface C viendra en contact avec la rondelle 9. Etant donné que L₃ > L₂, la rondelle est poussée en direction des éléments coulissants en question, au point que, la pression de contact entre les éléments étant fortement augmentée, tout déplacement entre eux devient impossible. La surface C correspond donc à l'opération de verrouillage. Enfin, quand, par rotation de la came 10 dans le sens inverse des aiguilles d'une montre, la surface A est mise en contact avec la rondelle 9, étant donné que L₁ < L₂ < L₃, la rondelle 9 se déplace dans le sens opposé des éléments coulissants, au point que la pression de contact entre eux est presque annulée. Dans cette position, les éléments peuvent être montés/démontés relativement l'un par rapport à l'autre. La surface A correspond donc à l'opération de montage/démontage.The clamping means 10 of the tie rod 6 consist of a lever in the form of a rotary cam 10 whose axis of rotation 11 is fixedly mounted on the second end of the tie rod 6 and perpendicular to the axis of the latter. The cam 10 is composed of two identical parts, parallel and symmetrically situated with respect to the axis of the tie rod 6. The action surface of each cam part 10 is in contact with the washer 9 and comprises three successive rectilinear portions A, B, C connected together by rounded portions, and distant from the axis of rotation 11 by a length respectively L respectivement, L₂, L₃, with L₁ <L₂ <L₃. The cam 10 can be driven in rotation using a key 26, retractable or not, engaged with a groove 15 made in the cam 10. The function of the cam 10 is to vary the contact pressure, on the one hand, between the various elements mounted to slide on the tie rod 6 and, on the other hand, between the bearing surfaces 1a, 2a, 1g of the jaw 1 and of the jaw 2 and the guide surfaces of the cross member 3, in order to allow the fixing device to carry out one of the three operations in question, namely assembly / disassembly, displacement or locking. From FIG. 1, the operation of the cam 10 is easy to understand. When the surface B is in contact with the washer 9, the elements in question are slightly in pressure against each other, to the point that a relative movement between them becomes possible. The surface B therefore corresponds to the displacement operation. When cam 10 is turned clockwise, the surface C will come into contact with the washer 9. Since L₃> L₂, the washer is pushed towards the sliding elements in question, to the point that the contact pressure between the elements being greatly increased, any movement between them becomes impossible. The surface C therefore corresponds to the locking operation. Finally, when, by rotation of the cam 10 anticlockwise, the surface A is brought into contact with the washer 9, since L₁ <L₂ <L₃, the washer 9 moves in the direction opposite sliding elements, to the point that the contact pressure between them is almost canceled. In this position, the elements can be assembled / disassembled relatively to each other. Surface A therefore corresponds to the assembly / disassembly operation.

Le rôle de la douille résiliente 8, par exemple en élastomère de 95° Shore, est de contrôler la force exercée par la came 10 sur le dispositif, en ce sens que la longueur de la douille 8 variera proportionnellement aux forces de compression en jeu. De plus, la douille résiliente 8 facilite le passage de la came 10 d'une position à l'autre et exécute tout rattrapage de jeu. La douille résiliente 8 peut être remplacée par tout autre élément similaire, par exemple des rondelles ressort. Entre le prolongement 1d de la mordache 1 et la mâchoire 2 est interposé un ressort 17 de compression monté sur le tirant 6 qui tend à écarter la mordache 1 et la mâchoire 2 l'une de l'autre.The role of the resilient sleeve 8, for example made of 95 ° Shore elastomer, is to control the force exerted by the cam 10 on the device, in the sense that the length of the sleeve 8 will vary in proportion to the compression forces involved. In addition, the resilient sleeve 8 facilitates the passage of the cam 10 from one position to another and performs any backlash. The resilient sleeve 8 can be replaced by any other similar element, for example spring washers. Between the extension 1d of the jaw 1 and the jaw 2 is interposed a compression spring 17 mounted on the tie rod 6 which tends to separate the jaw 1 and the jaw 2 from one another.

Il est apparu avantageux de réaliser la mâchoire 2 en aluminium et la mordache 1 et le support 4 d'outil en matière synthétique pour diminuer au maximum le poids du dispositif de fixation.It appeared advantageous to produce the jaw 2 in aluminum and the jaw 1 and the support 4 of the tool in synthetic material in order to reduce the weight of the fixing device as much as possible.

Il est évident que de nombreuses modifications peuvent être apportées au mode de réalisation du dispositif de fixation décrit ci-dessus, sans sortir du cadre de la présente invention. Ainsi, la tête 13 du tirant 6 peut être constituée par un écrou en prise avec un filetage de la tige formant le tirant 6 ou tout autre élément monté de façon fixe, escamotable ou non, sur la première extrémité du tirant 6. La came 10 qui sert de levier peut avoir son axe de rotation 11 perpendiculaire à l'axe du tirant 6. De même, un genre de levier de serrage autre que celui de came peut être envisagé.It is obvious that many modifications can be made to the embodiment of the fastening device described above, without departing from the scope of the present invention. Thus, the head 13 of the tie rod 6 can be constituted by a nut engaged with a thread of the rod forming the tie rod 6 or any other element fixedly mounted, retractable or not, on the first end of the tie rod 6. The cam 10 which serves as a lever can have its axis of rotation 11 perpendicular to the axis of the tie rod. Similarly, a kind of clamping lever other than that of the cam can be envisaged.

De même, pour l'homme de l'art, il est évident que le dispositif de fixation, décrit ci-dessus en relation avec l'outil d'éjection, peut être utilisé dans le cas de la fixation d'un outil presseur, d'un outil guide, d'un outil de séparation des poses ou outil similaire, dans une station d'éjection des déchets ou de séparation des poses.Likewise, for those skilled in the art, it is obvious that the fixing device, described above in relation to the ejection tool, can be used in the case of fixing a pressing tool, a guide tool, a blanking tool or the like, in a waste ejection or blanking station.

Enfin, il est à noter que le dispositif de fixation décrit ci-dessus résoud parfaitement le risque d'une diminution de la précontrainte de serrage des mordaches sur la traverse de la station en question, diminution causée par un montage en biais du dispositif sur la traverse, grâce à l'élément résilient 8 qui autorise un redressement du dispositif, tout en maintenant la précontrainte à peu près à sa valeur initiale. De plus, il n'y a plus de danger d'un serrage trop élevé puisque ce dernier est automatiquement limité par l'élément résilient 8. Il s'ensuit que des matériaux de plus faible résistance, et donc plus légers, peuvent être utilisés.Finally, it should be noted that the fastening device described above perfectly resolves the risk of a reduction in the pre-tensioning of the jaws on the crosspiece of the station in question, a reduction caused by mounting the device at an angle on the crosspiece, thanks to the resilient element 8 which allows a straightening of the device, while maintaining the prestressing at little close to its original value. In addition, there is no longer any danger of too high a tightening since the latter is automatically limited by the resilient element 8. It follows that materials of lower resistance, and therefore lighter, can be used .

Claims (9)

  1. Device for fastening a stripping, a blank separating or a similar tool, on the adjustable crossbars of a waste stripping or a blank separating station within a sheet processing machine, the device comprising a rod-shaped tie bar (6) provided with a headed end (13), the said tie bar carrying successively a freely shifting support (4) for the tool (5, 26), the support being in free engagement with the headed end (13) of the tie bar (6), a first and a second guide (1 and 2) each being provided at least with one supporting surface (1a, 2a) slanted with regard to the axis of the tie bar (6) and destined to act jointly with two corresponding guiding surfaces of a crossbar (3) of the station, tightening means (10) fitted on the second end of the tie bar (6) and destined to push the sliding components towards the headed end (13) of the tie bar (6) in order to bring about a variation of their contact pressure thereby enabling the execution, as required, of the three following operations, ie the fitting and the dismantling, the shifting or the locking of the various components with regard to one another and to the crossbar (3), characterised by:
    - the second guide (2) having the shape of a jaw and being provided with a second slanted supporting surface (2e) which latter is opposite the first surface (2a) with regard to the axis of the tie bar (6) and destined to enter into contact with a second slanted supporting surface (le) of the first guide (1) in such a way as when tightening takes place, a third supporting surface (1g) of the first guide (1) will be held in contact with a guiding surface of the crossbar (3) in a direction essentially perpendicular to the axis of the tie bar (6),
    - Both guides (1, 2) being provided with means (12, 14) for interlocking the rotary shifting one with regard to the other on the tie bar (6),
    - Tightening means (10) having three positions (A, B and C) available, each being determined one with regard to the said operations, and
    - A resilient element (8) for play catch-up and tightening strength control being arranged between the action point of the tightening means (10) and the second guide (2).
  2. Device according to claim 1, characterised by the tightening means (10) comprising a lever shaped as a rotary cam (10) whose rotary axle (11) is perpendicular to the axis of the tie bar (6), and fitted permanently on the tie bar (6) whose surface of action includes three straight parts (A, B and C) held together by rounded parts, the straight parts (A, B and C) being distant perpendicularly to the rotary axle (11) by a distance equal to L₁, L₂, and L₃, with L₁ < L₂ < L₃, L₁ corresponding to the fitting and dismantling, L₂ to the shifting and L₃ to the interlocking operations, the interlocking means (10) being designed in such a way that, with the cam (10) moving rotarily from one position to the other, the resilient element (8) will be subjected to lengthening or shortening proportional to the difference between the two distances L₁, L₂ or L₃ respectively before or after the rotation of the cam (10), thereby causing a variation of the contact pressure between the various elements, which is proportional to this same difference.
  3. Device according to one of the claims 1 and 2, characterised by the lever being composed of two identical cams (10) situated symmetrically with regard to the axis of the tie bar (6).
  4. Device according to one of the claims 1 to 3, characterised by the third supporting surface (1g) of the first guide (1) being essentially parallel to the axis of the tie bar (6).
  5. Device according to one of the claims 2 to 4, characterised by a metal washer (9) being intercalated between the action point of the cam (10) and the resilient element shaped as an elastomere bushing (8) itself fitted on the tie-bar.
  6. Device according to one of the aforementioned claims, characterised by the V-shaped profile of the supporting surface (1a) of the first guide (1).
  7. Device according to one of the aforementioned claims, characterised by a compression spring (17) intercalated between the two guides (1, 2) tending to move them apart in the direction of the axis of the tie bar (6).
  8. Device according to one of the aforementioned claims, characterised by the headed end (13) of the tie bar (6) being held in a T-shaped groove (16) of the tool support (4) in such a way as to enable a rotary and longitudinal movement of the support (4) with regard to the first guide (1).
  9. Device according to one of the aforementioned claims, characterised by the headed end (13) of the tie bar (6) being fitted as a retractable or non-retractable item on the tie bar (6).
EP90116328A 1989-10-03 1990-08-25 Attachment of a tool for ejecting or separating parts or for a similar tool Expired - Lifetime EP0421114B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90116328T ATE99215T1 (en) 1989-10-03 1990-08-25 ATTACHING A TOOL FOR EJECTING OR SEPARATING PARTS OR SIMILAR TOOL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3605/89 1989-10-03
CH3605/89A CH681870A5 (en) 1989-10-03 1989-10-03

Publications (2)

Publication Number Publication Date
EP0421114A1 EP0421114A1 (en) 1991-04-10
EP0421114B1 true EP0421114B1 (en) 1993-12-29

Family

ID=4259584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90116328A Expired - Lifetime EP0421114B1 (en) 1989-10-03 1990-08-25 Attachment of a tool for ejecting or separating parts or for a similar tool

Country Status (11)

Country Link
US (1) US5064110A (en)
EP (1) EP0421114B1 (en)
JP (1) JP2514745B2 (en)
AT (1) ATE99215T1 (en)
AU (1) AU625088B2 (en)
BR (1) BR9004933A (en)
CA (1) CA2026291C (en)
CH (1) CH681870A5 (en)
DE (1) DE69005575T2 (en)
DK (1) DK0421114T3 (en)
ES (1) ES2048380T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100192742A1 (en) * 2009-01-30 2010-08-05 Michigan Lasercut Stripping apparatus
EP2937190B1 (en) 2014-04-25 2017-09-20 Mayr-Melnhof Karton AG Blank separation device with a pick up device and method for fixing at least one blank separation tool
US10016803B2 (en) * 2014-05-09 2018-07-10 Honda Motor Co., Ltd. Blanking die and method of blanking sheet metal therewith

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1198186A (en) * 1915-04-26 1916-09-12 Walter A Brown Book-rack.
DE1149976B (en) * 1958-02-22 1963-06-06 Friedrich Schroeter Method and device for breaking out the waste or the benefits from punched workpieces
US3432197A (en) * 1966-06-30 1969-03-11 Mc Donnell Douglas Corp Slider latch
US3459080A (en) * 1966-12-12 1969-08-05 Harris Intertype Corp Rotary stripping unit
CH490943A (en) * 1968-05-20 1970-05-31 Bobst Fils Sa J Waste ejector device in particular of a cut cardboard piece
DE2158907C3 (en) * 1971-11-27 1975-09-04 Wupa-Maschinenfabrik Gmbh & Co Kg, 4057 Brueggen Method and device for breaking out pre-cut pieces of material from sheet-like material webs
IT1023941B (en) * 1974-03-07 1978-05-30 Bobst Fils Sa J DEVICE FOR EXPULSES AND CUTS OF A SHEET CUT BY MEANS OF A PLATE PRESS
DE2815797C3 (en) * 1978-04-12 1980-11-06 Wupa - Maschinenfabrik Gmbh, 4057 Brueggen Device for breaking out the waste or the benefits from punched workpieces from flat material
CH674486A5 (en) * 1988-01-20 1990-06-15 Bobst Sa

Also Published As

Publication number Publication date
CA2026291C (en) 1994-09-06
JP2514745B2 (en) 1996-07-10
ATE99215T1 (en) 1994-01-15
BR9004933A (en) 1991-09-10
EP0421114A1 (en) 1991-04-10
AU6318690A (en) 1991-04-11
AU625088B2 (en) 1992-07-02
CH681870A5 (en) 1993-06-15
ES2048380T3 (en) 1994-03-16
DK0421114T3 (en) 1994-04-25
JPH03121797A (en) 1991-05-23
DE69005575T2 (en) 1994-04-07
US5064110A (en) 1991-11-12
CA2026291A1 (en) 1991-04-04
DE69005575D1 (en) 1994-02-10

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