EP2718091A1 - Clip for stretching a film - Google Patents
Clip for stretching a filmInfo
- Publication number
- EP2718091A1 EP2718091A1 EP11740958.1A EP11740958A EP2718091A1 EP 2718091 A1 EP2718091 A1 EP 2718091A1 EP 11740958 A EP11740958 A EP 11740958A EP 2718091 A1 EP2718091 A1 EP 2718091A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- clamp
- lateral
- main
- rollers
- flange
- 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- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/20—Edge clamps
Definitions
- the present invention relates to transverse drawing devices for the manufacture of thin plastic films.
- Thin plastic film manufacturing processes comprise a hot cross-stretching step which is carried out inside a large oven.
- the clamps comprise clamping means mounted on a clamp body itself provided with sliding or bearing members bearing on a fixed guide rail.
- the clamps there are two guide rails carrying two sets of clamps which hold the two lateral edges of the film.
- Two chains move the clamps along the rails in displacement, for the longitudinal displacement of the film in the oven.
- the rails are parallel, until the film has reached the appropriate softening temperature. Then, the rails move away from each other symmetrically, so as to ensure transverse stretching of the film. After stretching, the guide rails become parallel again, and the film is cooled.
- the speed of travel of the clamps and the film exceeds 500 m / min.
- a gripper for holding and guiding strips of material to be stretched is described, for example, in document FR 2 686 041.
- Such a clamp comprises:
- a main pincer body comprising an inner lateral wing secured to an upper transverse wing which carries upper rollers capable of rolling on an upper face and two opposite lateral faces of a guide rail of a stretching machine; bandaged,
- a clamp bottom attached to the main clamp body, carrying lower rollers capable of rolling on the lateral faces of the guide rail;
- - Band clamping means in the form of two levers called valets, able to hold an edge of the material strip along an inner side of the clamp body, that is to say along the side facing the strip of material to be stretched.
- the inner side wing is solid and continuous, so as to protect the strip of material to be stretched against the projections of lubricant. Indeed, during the movement of the clamp on the rail, the rollers rotate at high speed and produce radial projections of lubricant. According to the inner side of the clamp, that is to say on the side of the strip of material to be stretched, these projections are intercepted by the inner side wing of the main clamp body.
- the main clamp body has a transverse "U" profile, with an outer side wing opposite and parallel to the inner side wing. This outer side wing intercepts the projections of lubricant produced to the outside by the upper rollers.
- the clamp bottom has an outer side flange, which intercepts to the outside projections of lubricant produced by the lower rollers.
- a disadvantage is that the lubricant, compatible with the high temperature of the furnace, becomes particularly viscous at a lower temperature, and tends to accumulate in the bottom of the clamp body, disrupting the operation of the lower rollers.
- the present invention aims to avoid the disadvantages of these known clamps, both by improving the discharge of lubricant flows in the clamp bottom, and by reducing the weight of the clamp without impairing its holding capabilities and guidance.
- the invention aims to facilitate the mounting of such a clamp, in particular the mounting of the upper roller capable of rolling on the upper face of the rail.
- the present invention provides a holding clip for guiding and holding a strip of material to be stretched, said clip comprising: a main pincer body, comprising an inner lateral wing secured to an upper transverse wing which carries upper rollers capable of rolling on an upper face and two opposite lateral faces of a guide rail of a stretching machine; bandaged,
- a clamp bottom attached to the main clamp body, carrying lower rollers capable of rolling on the lateral faces of the guide rail;
- tape clamping means mounted on the main clamp body, and able to hold an edge of the material strip along an inner side of the clamp body,
- the upper transverse wing is generally flat and devoid of outer lateral wing, so that the main body of the clip has, in cross section, the general shape of an "L" returned.
- the removal of the outer lateral wing substantially reduces the weight of the clamp.
- the gripper bottom is generally flat, oriented parallel to the upper transverse flange, devoid of the outer lateral flange, and fixed to the free end of the inner lateral flange,
- the removal of the outer side wing also reduces the flow of lubricant directed to the bottom of the clamp, and facilitates the removal of the lubricant away from the clamp bottom, avoiding disrupting the operation of the lower rollers.
- the clamp bottom may comprise cavities open on its upper face and having passage holes for greasy residues.
- the cavities may comprise a flat bottom or slope down to the orifices.
- the upper roller or rollers comprise a ball bearing having an inner ring mounted on a transverse axis engaged in lateral bores of a housing of the main body clamp.
- the transverse axis comprises:
- the stepped ring is first mounted in the inner race of ball bearing, and the assembly is engaged in the housing of the main body clamp.
- the screw can then be axially inserted into the shoulder ring, without any risk of decentering the bearing.
- the screw shank is smooth, and its free end engages a small clearance in a lateral bore of the main clamp body
- the screw head is threaded and screwed into a threaded bore of the main clamp body.
- This fastening device is particularly simple and inexpensive, ensuring effective maintenance and balance of the bearing in the main body of the gripper.
- FIG. 1 is a perspective view from above the outer side of a holding clamp according to an embodiment of the present invention
- Figure 2 is a perspective view from below of the outer side of the clip of Figure 1;
- FIG. 3 is a perspective view from above the inner side of the clamp of Figure 1;
- FIG. 4 is an end view of the clamp of Figure 1;
- Figure 5 is a perspective view from above of the outer side of the main gripper body of Figure 1;
- Figure 6 is a perspective view from below of the outer side of the gripper main body of Figure 1;
- - Figure 7 is a perspective view from above of the clamp bottom of Figure 1, provided with lower rollers;
- FIG. 8 is a perspective view from above of the clamp bottom of FIG. 7, the rollers having been removed.
- Figure 9 is a cross section of the main clamp body of Figure 1, in line with an upper roller axis.
- the film stretching gripper 1 is intended to hold and guide a strip of stretching material 2.
- the clip 1 holds a first edge 2a of the strip of material 2, in association with other clamps which hold the same edge 2a, while a set of other opposite clamps hold the opposite edge of the strip of material to be stretched 2, not shown in the figures.
- the gripper 1 moves along a guide rail 3 (FIG. 4), and is driven in translation along the rail 3 by a chain 4 itself guided. and driven in translation by unrepresented and conventional drive means in a film stretching machine.
- the clamp 1 In the clamp 1 is defined an inner side 5 oriented towards the strip of material to be stretched 2, and an outer side 6 facing away from the strip of material to be stretched 2.
- the clamp 1 comprises a main body of clamp 7 and a clamp bottom 8 secured to one another.
- the main clamp body 7 comprises an inner lateral wing 7a integral with an upper transverse wing 7b.
- the inner side wing 7a is generally flat, oriented perpendicularly to the plane of the strip of material to be stretched 2 and parallel to its edge 2a, while the upper transverse wing 7b is generally flat and oriented horizontally, perpendicularly to the lateral wing inside 7a.
- the main body clamp 7 has the general shape of an "L" returned, a first branch of the "L” being constituted by the inner side wing 7a vertical, the second branch of the "L” being formed by the upper transverse flange 7b horizontal.
- the main gripper body 7 carries upper rollers, better visible in FIG. 2, comprising a pair of inner lateral guide upper rollers 9 and 10, a pair of lateral upper lateral guide rollers 11 and 12, and an upper roller central vertical guide 13.
- the upper rollers 9-13 are able to roll on an upper face and two opposite lateral faces of a guide rail 3 (FIG. 4) of a band stretching machine.
- Each of the upper lateral guide rollers 9-12 is rotatably mounted on a respective vertical axis.
- FIG. 1 shows the axis 1 1 a on which the roller 1 1 is mounted, and the axis 12 a on which the roller 12 is mounted.
- the gripper main body 7 further comprises band clamping means 4, capable of holding an edge 2a of the stretching material strip 2 according to the inner side 5 of the gripper main body 7.
- the band clamping means 14 comprise two pivoting levers 14a and 14b, generally called valets, pivotally mounted about a longitudinal axis 14c, comprising a respective operating arm 14d or 14e, and comprising a respective clamping arm 14f or 14g (Figure 3).
- the clamping arms 14f and 14g are shaped to bear against a horizontal support plate 14h ( Figure 4).
- the clamping lever 14a or 14b is biased towards its clamping position illustrated in Figure 4 by elastic means such as coil springs 14i and 14j ( Figure 1).
- the clamping arm 14f is braced on the support plate 14h, in an inclined position towards the outer side, so that traction exerted by the strip of material to be stretched 2 tends to rotate the clamping lever 14a in the direction of increasing clamping.
- the upper central guide vertical roller 13 is mounted in a housing 13a ( Figures 2, 6 and 9), and is held in this housing by a transverse axis 13b ( Figures 1 and 9).
- the upper central guide roller 13 comprises a ball bearing having an inner ring 13b mounted on the transverse axis 13b itself engaged in lateral bores 3c and 13d of the housing. 13a.
- the transverse axis 13b comprises a shoulder ring 13e and a screw 13f.
- the shoulder of the shoulder ring 13e is engaged in the lateral bore 13c, while the head 13g of the screw 13f is threaded and is screwed into the lateral bore 3d itself threaded.
- the rod 13b of the screw 13f which forms the transverse axis, is smooth, engaged with little play in the shoulder ring 13e, its free end engaging a small clearance in the lateral bore 13c of the main clamp body 7.
- the shoulder of the shoulder ring 13e forms a first lateral positioning stop for the ring 13h inner bearing, opposing the displacement of the upper central guide vertical roller 13 towards the inner side 5 of the clamp 1.
- the head 13g of the screw 13f forms a second lateral positioning stop of the inner ring of the rolling 13h, opposing the displacement of the upper central guide vertical roller 13 towards the outer side 6 of the clamp 1.
- the stepped collar 13 is engaged in the inner ring 3h of the roller 13, then the assembly thus formed is engaged in the housing 13a, and then it suffices to insert the screw 13f. in the shoulder ring 13e to fix the set.
- the clamp bottom 8 as illustrated in FIGS. 1 to 4, 7 and 8, carries lower rollers capable of rolling on the lateral faces of the guide rail 3 (FIG. 4).
- These lower rollers comprise a pair of inner lower lateral guide rollers 15 and 16, and a pair of lateral lower lateral guide rollers 17 and 18, which are all mounted on respective vertical axes such as the axis 18a of the roller 18 or the axis 17a of the roller 17.
- the clamp bottom 8 is attached to the main clamp body 7, and attached to the lower end of the inner side wing 7a.
- a vertical screw 19 further connects the clamp bottom 8 to the upper transverse flange 7b of the main clamp body 7, to ensure the rigidity of the assembly.
- the vertical screw 19 connects with a link of the chain 4, to connect the chain 4 to the clamp 1.
- the assembly formed by the main clamp body 7 and the gripper base 8 assembled, as illustrated in the figures, thus has the general shape of a "U" lying with total opening directed towards the outer side 6 of the 1.
- the "U" profile is fully open, devoid of outer lateral wings coming to cover the rollers 1 1, 12, 17 and 18.
- the gripper bottom 8 comprises cavities 8a, 8b, 8c, 8d and 8e open on its upper face, and passage orifices 8f, 8g, 8h, 8i (FIG. 2). allowing the passage of fatty residues downwards.
- the passages 8f-8i are lined with lower annular lips, favoring the detachment of drops of greasy residues to prevent their accumulation.
- the passage orifices 8f-8i of the greasy residues are formed in the bottom of the receiving cavities 8d and 8e, communicating with the open cavities 8a, 8b and 8c.
- the cavities 8a, 8b, 8c, 8d and 8e have a flat bottom or downward slope towards the through holes 8f-8i.
- the lower rollers 15-18 are not embedded in the cavities 8a, 8b and 8c, but they overcome these cavities and lie in a plane situated above the edges of the cavities 8a, 8b and 8c.
- the upper rollers 9-12 are below the upper transverse flange 7b, and projections of greasy residues produced by the rotation of the upper rollers 9-12 can escape according to the outer side 6 of the clamp 1, without falling back into the clamp bottom 8. This reduces the accumulation of greasy residues in the clamp bottom 8.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The supporting clip according to the invention comprises a main clip body (7) having an inner side flange (7a) rigidly connected to a top transverse flange (7b) that has top rollers (9, 11, 12) capable of rolling on the surfaces of a guide rail of a strip-stretching machine. A clip bottom (8) is mounted onto the main clip body (7), and has bottom rollers (15, 17, 18) capable of rolling on the side surfaces of the guide rail. A strip-clamping means (14) makes it possible to hold an edge of a strip (2) of material along an inner side (5) of the clip body (7). The top transverse flange (7b) is flat and free of outer flaps such that the cross-section of the main clip body (7) has the general shape of an inverted "L". The clip bottom (8) is flat and free of outer flaps. A lightweight clip which efficiently removes greasy residue can thus be produced.
Description
PINCE D'ETIREMENT DE FILM FILM STRETCHING PLIERS
DOMAINE TECHNIQUE DE L'INVENTION TECHNICAL FIELD OF THE INVENTION
La présente invention concerne les dispositifs d'étirage transversal pour la fabrication de films minces en matière plastique. The present invention relates to transverse drawing devices for the manufacture of thin plastic films.
Les procédés de fabrication de films minces en matière plastique comprennent une étape d'étirage transversal à chaud que l'on réalise à l'intérieur d'un four de grandes dimensions. Lors du passage dans ce four, le film est tenu par deux séries de pinces réparties en longueur selon les deux bords latéraux du film. Les pinces comprennent des moyens de serrage montés sur un corps de pince lui- même muni d'organes de glissement ou de roulement en appui sur un rail de guidage fixe. On dispose ainsi, dans le four, deux rails de guidage portant deux séries de pinces qui tiennent les deux bords latéraux du film. Deux chaînes entraînent en déplacement les pinces le long des rails, pour le déplacement longitudinal du film dans le four. Thin plastic film manufacturing processes comprise a hot cross-stretching step which is carried out inside a large oven. When passing through this oven, the film is held by two sets of grippers distributed in length along the two lateral edges of the film. The clamps comprise clamping means mounted on a clamp body itself provided with sliding or bearing members bearing on a fixed guide rail. Thus, in the oven, there are two guide rails carrying two sets of clamps which hold the two lateral edges of the film. Two chains move the clamps along the rails in displacement, for the longitudinal displacement of the film in the oven.
Dans une première zone du four, les rails sont parallèles, jusqu'à ce que le film ait atteint la température de ramollissement appropriée. Ensuite, les rails s'éloignent l'un de l'autre de façon symétrique, de manière à assurer un étirage transversal du film. Après l'étirage, les rails de guidage redeviennent parallèles, et le film est refroidi. In a first zone of the oven, the rails are parallel, until the film has reached the appropriate softening temperature. Then, the rails move away from each other symmetrically, so as to ensure transverse stretching of the film. After stretching, the guide rails become parallel again, and the film is cooled.
Dans un dispositif d'étirage, pour atteindre des cadences de fabrication suffisantes, la vitesse de défilement des pinces et du film dépasse les 500 m/min. In a drawing device, to achieve sufficient production rates, the speed of travel of the clamps and the film exceeds 500 m / min.
Lors de ce déplacement, il est nécessaire de lubrifier les organes de glissement ou de roulement à l'interface entre le corps de pince et le rail. En particulier, dans le cas de roulements à billes, une lubrification est nécessaire. During this movement, it is necessary to lubricate the sliding or rolling members at the interface between the clamp body and the rail. In particular, in the case of ball bearings, lubrication is necessary.
Une pince pour maintien et guidage de bandes de matériau à étirer est décrite par exemple dans le document FR 2 686 041. A gripper for holding and guiding strips of material to be stretched is described, for example, in document FR 2 686 041.
Une telle pince comprend : Such a clamp comprises:
- un corps principal de pince, comportant une aile latérale intérieure solidaire d'une aile transversale supérieure qui porte des galets supérieurs aptes à rouler sur une face supérieure et deux faces latérales opposées d'un rail de guidage d'une machine d'étirement de bande, a main pincer body, comprising an inner lateral wing secured to an upper transverse wing which carries upper rollers capable of rolling on an upper face and two opposite lateral faces of a guide rail of a stretching machine; bandaged,
- un fond de pince rapporté sur le corps principal de pince, portant des galets inférieurs aptes à rouler sur les faces latérales du rail de guidage, a clamp bottom attached to the main clamp body, carrying lower rollers capable of rolling on the lateral faces of the guide rail;
- des moyens de serrage de bande, sous forme de deux leviers appelés valets, aptes à tenir un bord de la bande de matériau selon un côté intérieur de corps de pince, c'est-à-dire selon le côté orienté vers la bande de matériau à étirer.
Dans ce dispositif connu, l'aile latérale intérieure est pleine et continue, de façon à protéger la bande de matériau à étirer contre les projections de lubrifiant. En effet, lors du déplacement de la pince sur le rail, les galets tournent à grande vitesse et produisent des projections radiales de lubrifiant. Selon le côté intérieur de la pince, c'est-à-dire du côté de la bande de matériau à étirer, ces projections sont interceptées par l'aile latérale intérieure du corps principal de pince. - Band clamping means, in the form of two levers called valets, able to hold an edge of the material strip along an inner side of the clamp body, that is to say along the side facing the strip of material to be stretched. In this known device, the inner side wing is solid and continuous, so as to protect the strip of material to be stretched against the projections of lubricant. Indeed, during the movement of the clamp on the rail, the rollers rotate at high speed and produce radial projections of lubricant. According to the inner side of the clamp, that is to say on the side of the strip of material to be stretched, these projections are intercepted by the inner side wing of the main clamp body.
Dans ce document, le corps principal de pince comporte un profil transversal en « U », avec une aile latérale extérieure opposée et parallèle à l'aile latérale intérieure. Cette aile latérale extérieure intercepte les projections de lubrifiant produites vers l'extérieur par les galets supérieurs. De même, le fond de pince comporte une aile latérale extérieure, qui intercepte vers l'extérieur les projections de lubrifiant produites par les galets inférieurs. In this document, the main clamp body has a transverse "U" profile, with an outer side wing opposite and parallel to the inner side wing. This outer side wing intercepts the projections of lubricant produced to the outside by the upper rollers. Similarly, the clamp bottom has an outer side flange, which intercepts to the outside projections of lubricant produced by the lower rollers.
Ainsi, la plupart des projections radiales de lubrifiant provenant des galets tombent dans le fond de pince où elles sont recueillies. Thus, most radial projections of lubricant from the rollers fall into the bottom of the clamp where they are collected.
Un inconvénient est que le lubrifiant, compatible avec la température élevée du four, devient particulièrement visqueux à température plus basse, et tend à s'accumuler dans le fond du corps de pince, perturbant le fonctionnement des galets inférieurs. A disadvantage is that the lubricant, compatible with the high temperature of the furnace, becomes particularly viscous at a lower temperature, and tends to accumulate in the bottom of the clamp body, disrupting the operation of the lower rollers.
Un autre inconvénient est la masse relativement importante d'une telle structure de pince à corps de pince en « U » et fond de pince en « U ». Considérant qu'une machine d'étirement de film comporte plusieurs milliers de telles pinces, cela se traduit par une usure des rails de guidage, et la nécessité d'une grande force d'entraînement pour déplacer les pinces et le film, en particulier lorsque les pinces sont déplacées rapidement, à des vitesses dépassant 500 m/min. Another disadvantage is the relatively large mass of such a "U" clamp body clamp structure and "U" clamp bottom. Considering that a film stretching machine has several thousand such grippers, this results in wear of the guide rails, and the need for a large driving force to move the grippers and the film, especially when the clamps are moved rapidly at speeds exceeding 500 m / min.
EXPOSE DE L'INVENTION SUMMARY OF THE INVENTION
La présente invention a pour objet d'éviter les inconvénients de ces pinces connues, à la fois en améliorant l'évacuation des écoulements de lubrifiant dans le fond de pince, et en réduisant la masse de la pince sans nuire à ses fonctionnalités de tenue et de guidage. The present invention aims to avoid the disadvantages of these known clamps, both by improving the discharge of lubricant flows in the clamp bottom, and by reducing the weight of the clamp without impairing its holding capabilities and guidance.
Selon un autre objet, l'invention vise à faciliter le montage d'une telle pince, en particulier le montage du galet supérieur apte à rouler sur la face supérieure du rail. According to another object, the invention aims to facilitate the mounting of such a clamp, in particular the mounting of the upper roller capable of rolling on the upper face of the rail.
Pour atteindre ces objets ainsi que d'autres, la présente invention propose une pince de maintien pour guider et tenir une bande de matériau à étirer, ladite pince comprenant :
- un corps principal de pince, comportant une aile latérale intérieure solidaire d'une aile transversale supérieure qui porte des galets supérieurs aptes à rouler sur une face supérieure et deux faces latérales opposées d'un rail de guidage d'une machine d'étirement de bande, To achieve these objects as well as others, the present invention provides a holding clip for guiding and holding a strip of material to be stretched, said clip comprising: a main pincer body, comprising an inner lateral wing secured to an upper transverse wing which carries upper rollers capable of rolling on an upper face and two opposite lateral faces of a guide rail of a stretching machine; bandaged,
- un fond de pince rapporté sur le corps principal de pince, portant des galets inférieurs aptes à rouler sur les faces latérales du rail de guidage, a clamp bottom attached to the main clamp body, carrying lower rollers capable of rolling on the lateral faces of the guide rail;
- des moyens de serrage de bande, montés sur le corps principal de pince, et aptes à tenir un bord de la bande de matériau selon un côté intérieur de corps de pince, tape clamping means, mounted on the main clamp body, and able to hold an edge of the material strip along an inner side of the clamp body,
- l'aile transversale supérieure étant généralement plate et dépourvue d'aile latérale extérieure, de sorte que le corps principal de pince présente, en section transversale, la forme générale d'un « L » retourné. - The upper transverse wing is generally flat and devoid of outer lateral wing, so that the main body of the clip has, in cross section, the general shape of an "L" returned.
La suppression de l'aile latérale extérieure favorise l'éjection des projections de lubrifiant vers l'extérieur de la pince, ce qui réduit le débit de lubrifiant recueilli dans le fond de pince. L'évacuation ultérieure du lubrifiant depuis le fond de pince est ainsi facilitée. The removal of the outer side wing promotes the ejection of lubricant projections to the outside of the clamp, which reduces the flow of lubricant collected in the clamp bottom. The subsequent evacuation of the lubricant from the gripper bottom is thus facilitated.
Simultanément, la suppression de l'aile latérale extérieure réduit sensiblement la masse de la pince. At the same time, the removal of the outer lateral wing substantially reduces the weight of the clamp.
Selon un mode de réalisation préféré, on prévoit également que : According to a preferred embodiment, it is also provided that:
- le fond de pince est généralement plat, orienté parallèlement à l'aile transversale supérieure, dépourvu de l'aile latérale extérieure, et fixé à l'extrémité libre de l'aile latérale intérieure, the gripper bottom is generally flat, oriented parallel to the upper transverse flange, devoid of the outer lateral flange, and fixed to the free end of the inner lateral flange,
- l'ensemble formé par le corps principal de pince et le fond de pince assemblés ayant ainsi la forme générale d'un « U » couché à ouverture totale dirigée vers le côté extérieur de la pince. - The assembly formed by the gripper main body and the assembled clamp bottom thus having the general shape of a "U" lying completely open towards the outer side of the clamp.
La suppression de l'aile latérale extérieure réduit également le flux de lubrifiant dirigé vers le fond de pince, et facilite l'évacuation du lubrifiant à l'écart du fond de pince, évitant de perturber le fonctionnement des galets inférieurs. The removal of the outer side wing also reduces the flow of lubricant directed to the bottom of the clamp, and facilitates the removal of the lubricant away from the clamp bottom, avoiding disrupting the operation of the lower rollers.
De préférence, le fond de pince peut comprendre des cavités ouvertes sur sa face supérieure et comportant des orifices de passage des résidus graisseux. Preferably, the clamp bottom may comprise cavities open on its upper face and having passage holes for greasy residues.
On permet ainsi une évacuation directe des lubrifiants recueillis dans le fond de pince. This allows a direct evacuation of the lubricants collected in the clamp bottom.
De manière plus avantageuse, les cavités peuvent comporter un fond plat ou à pente descendant vers les orifices. More advantageously, the cavities may comprise a flat bottom or slope down to the orifices.
Cette disposition facilite encore l'évacuation du lubrifiant. On a en effet constaté, sur des pinces connues, que des contrepentes produisent une accumulation de lubrifiant qui empêchent l'évacuation.
Pour résoudre le problème du montage du galet supérieur, on peut avantageusement prévoir que le ou les galets supérieurs comportent un roulement à billes ayant une bague intérieure montée sur un axe transversal engagé dans des alésages latéraux d'un logement du corps principal de pince. This arrangement further facilitates the removal of the lubricant. It has been found, on known clamps, that counterfloors produce a buildup of lubricant that prevent evacuation. To solve the problem of mounting the upper roller, it can be advantageously provided that the upper roller or rollers comprise a ball bearing having an inner ring mounted on a transverse axis engaged in lateral bores of a housing of the main body clamp.
De préférence, l'axe transversal comprend : Preferably, the transverse axis comprises:
- une bague épaulée dont l'épaulement forme une première butée de positionnement latéral de la bague intérieure de roulement, a stepped ring whose shoulder forms a first lateral positioning stop of the inner bearing ring;
- une vis à tige et tête, la tige étant engagée dans la bague épaulée, la tête formant une seconde butée de positionnement latéral de la bague intérieure de roulement. - A screw with stem and head, the rod being engaged in the shoulder ring, the head forming a second lateral positioning stop of the inner race ring.
De la sorte, la bague épaulée est tout d'abord montée dans la bague intérieure de roulement à billes, et l'ensemble est engagé dans le logement du corps principal de pince. On peut ensuite introduire axialement la vis dans la bague épaulée, sans risque de décentrage du roulement. In this way, the stepped ring is first mounted in the inner race of ball bearing, and the assembly is engaged in the housing of the main body clamp. The screw can then be axially inserted into the shoulder ring, without any risk of decentering the bearing.
Selon un mode de réalisation avantageux, on prévoit que : According to an advantageous embodiment, it is provided that:
- la tige de vis est lisse, et son extrémité libre s'engage à faible jeu dans un alésage latéral du corps principal de pince, the screw shank is smooth, and its free end engages a small clearance in a lateral bore of the main clamp body,
- la tête de vis est filetée et se visse dans un alésage taraudé du corps principal de pince. - The screw head is threaded and screwed into a threaded bore of the main clamp body.
Ce dispositif de fixation est particulièrement simple et peu onéreux, assurant un maintien et un centrage efficaces du roulement dans le corps principal de pince. This fastening device is particularly simple and inexpensive, ensuring effective maintenance and balance of the bearing in the main body of the gripper.
DESCRIPTION SOMMAIRE DES DESSINS SUMMARY DESCRIPTION OF THE DRAWINGS
D'autres objets, caractéristiques et avantages de la présente invention ressortiront de la description suivante de modes de réalisation particuliers, faite en relation avec les figures jointes, parmi lesquelles : Other objects, features and advantages of the present invention will become apparent from the following description of particular embodiments, with reference to the accompanying figures, in which:
- la figure 1 est une vue en perspective de dessus du côté extérieur d'une pince de maintien selon un mode de réalisation de la présente invention ; - Figure 1 is a perspective view from above the outer side of a holding clamp according to an embodiment of the present invention;
- la figure 2 est une vue en perspective de dessous du côté extérieur de la pince de la figure 1 ; Figure 2 is a perspective view from below of the outer side of the clip of Figure 1;
- la figure 3 est une vue en perspective de dessus du côté intérieur de la pince de la figure 1 ; - Figure 3 is a perspective view from above the inner side of the clamp of Figure 1;
- la figure 4 est une vue en bout de la pince de la figure 1 ; - Figure 4 is an end view of the clamp of Figure 1;
- la figure 5 est une vue en perspective de dessus du côté extérieur du corps principal de pince de la figure 1 ; Figure 5 is a perspective view from above of the outer side of the main gripper body of Figure 1;
- la figure 6 est une vue en perspective de dessous du côté extérieur du corps principal de pince de la figure 1 ;
- la figure 7 est une vue en perspective de dessus du fond de pince de la figure 1 , muni des galets inférieurs ; Figure 6 is a perspective view from below of the outer side of the gripper main body of Figure 1; - Figure 7 is a perspective view from above of the clamp bottom of Figure 1, provided with lower rollers;
- la figure 8 est une vue en perspective de dessus du fond de pince de la figure 7, les galets ayant été enlevés ; et FIG. 8 is a perspective view from above of the clamp bottom of FIG. 7, the rollers having been removed; and
- la figure 9 est une coupe transversale du corps principal de pince de la figure 1 , au droit d'un axe de galet supérieur. - Figure 9 is a cross section of the main clamp body of Figure 1, in line with an upper roller axis.
DESCRIPTION DES MODES DE REALISATION PREFERES DESCRIPTION OF THE PREFERRED EMBODIMENTS
Dans le mode de réalisation illustré sur les figures, la pince 1 d'étirement de film est destinée à assurer le maintien et le guidage d'une bande de matériau à étirer 2. La pince 1 tient un premier bord 2a de la bande de matériau à étirer 2, en association avec d'autres pinces qui tiennent le même bord 2a, tandis qu'un ensemble d'autres pinces opposées tiennent le bord opposé de la bande de matériau à étirer 2, non représenté sur les figures. In the embodiment illustrated in the figures, the film stretching gripper 1 is intended to hold and guide a strip of stretching material 2. The clip 1 holds a first edge 2a of the strip of material 2, in association with other clamps which hold the same edge 2a, while a set of other opposite clamps hold the opposite edge of the strip of material to be stretched 2, not shown in the figures.
Pour assurer le déplacement de la bande de matériau à étirer 2, la pince 1 se déplace le long d'un rail de guidage 3 (figure 4), et est entraînée en translation le long du rail 3 par une chaîne 4 elle-même guidée et entraînée en translation par des moyens d'entraînement non représentés et traditionnels dans une machine d'étirement de film. To ensure the displacement of the strip of material to be stretched 2, the gripper 1 moves along a guide rail 3 (FIG. 4), and is driven in translation along the rail 3 by a chain 4 itself guided. and driven in translation by unrepresented and conventional drive means in a film stretching machine.
On définit dans la pince 1 un côté intérieur 5 orienté vers la bande de matériau à étirer 2, et un côté extérieur 6 orienté à l'opposé de la bande de matériau à étirer 2. In the clamp 1 is defined an inner side 5 oriented towards the strip of material to be stretched 2, and an outer side 6 facing away from the strip of material to be stretched 2.
La pince 1 comprend un corps principal de pince 7 et un fond de pince 8 solidarisés l'un à l'autre. The clamp 1 comprises a main body of clamp 7 and a clamp bottom 8 secured to one another.
Le corps principal de pince 7 comporte une aile latérale intérieure 7a solidaire d'une aile transversale supérieure 7b. The main clamp body 7 comprises an inner lateral wing 7a integral with an upper transverse wing 7b.
L'aile latérale intérieure 7a est généralement plate, orientée perpendiculairement au plan de la bande de matériau à étirer 2 et parallèlement à son bord 2a, tandis que l'aile transversale supérieure 7b est généralement plate et orientée horizontalement, perpendiculairement à l'aile latérale intérieure 7a. Ainsi, vue en bout, comme illustré sur la figure 4, le corps principal de pince 7 présente la forme générale d'un « L » retourné, une première branche du « L » étant constituée par l'aile latérale intérieure 7a verticale, la seconde branche du « L » étant formée par l'aile transversale supérieure 7b horizontale. The inner side wing 7a is generally flat, oriented perpendicularly to the plane of the strip of material to be stretched 2 and parallel to its edge 2a, while the upper transverse wing 7b is generally flat and oriented horizontally, perpendicularly to the lateral wing inside 7a. Thus, end view, as shown in Figure 4, the main body clamp 7 has the general shape of an "L" returned, a first branch of the "L" being constituted by the inner side wing 7a vertical, the second branch of the "L" being formed by the upper transverse flange 7b horizontal.
Le corps principal de pince 7 porte des galets supérieurs, mieux visibles sur la figure 2, comprenant une paire de galets supérieurs intérieurs de guidage latéral 9 et 10, une paire de galets supérieurs extérieurs de guidage latéral 1 1 et 12, et un galet supérieur central de guidage vertical 13. Les galets supérieurs 9-13
sont aptes à rouler sur une face supérieure et deux faces latérales opposées d'un rail de guidage 3 (figure 4) d'une machine d'étirement de bande. The main gripper body 7 carries upper rollers, better visible in FIG. 2, comprising a pair of inner lateral guide upper rollers 9 and 10, a pair of lateral upper lateral guide rollers 11 and 12, and an upper roller central vertical guide 13. The upper rollers 9-13 are able to roll on an upper face and two opposite lateral faces of a guide rail 3 (FIG. 4) of a band stretching machine.
Chacun des galets supérieurs de guidage latéral 9-12 est monté rotatif sur un axe vertical respectif. On voit par exemple, sur la figure 1 , l'axe 1 1 a sur lequel est monté le galet 1 1 , et l'axe 12a sur lequel est monté le galet 12. Each of the upper lateral guide rollers 9-12 is rotatably mounted on a respective vertical axis. For example, FIG. 1 shows the axis 1 1 a on which the roller 1 1 is mounted, and the axis 12 a on which the roller 12 is mounted.
Le corps principal de pince 7 comprend en outre des moyens de serrage de bande 4, aptes à tenir un bord 2a de la bande de matériau à étirer 2 selon le côté intérieur 5 du corps principal de pince 7. The gripper main body 7 further comprises band clamping means 4, capable of holding an edge 2a of the stretching material strip 2 according to the inner side 5 of the gripper main body 7.
En pratique, les moyens de serrage de bande 14 comprennent deux leviers pivotants 14a et 14b, généralement appelés valets, montés pivotants autour d'un axe longitudinal 14c, comprenant un bras de manœuvre respectif 14d ou 14e, et comprenant un bras de serrage respectif 14f ou 14g (figure 3). Les bras de serrage 14f et 14g sont conformés pour venir en appui contre une platine d'appui 14h horizontale (figure 4). Ainsi, le bord 2a de la bande de matériau à étirer 2, comme illustré sur la figure 4, est serré entre le bras de serrage tel que le bras 14f et la platine d'appui 14h. Le levier de serrage 14a ou 14b est rappelé vers sa position de serrage illustrée sur la figure 4 par des moyens élastiques tels que des ressorts hélicoïdaux 14i et 14j (figure 1). En position de serrage illustrée sur la figure 4, le bras de serrage 14f est arc-bouté sur la platine d'appui 14h, en position inclinée vers le côté extérieur, de façon qu'une traction exercée par la bande de matériau à étirer 2 tende à faire pivoter le levier de serrage 14a dans le sens d'une augmentation du serrage. In practice, the band clamping means 14 comprise two pivoting levers 14a and 14b, generally called valets, pivotally mounted about a longitudinal axis 14c, comprising a respective operating arm 14d or 14e, and comprising a respective clamping arm 14f or 14g (Figure 3). The clamping arms 14f and 14g are shaped to bear against a horizontal support plate 14h (Figure 4). Thus, the edge 2a of the stretching material strip 2, as illustrated in FIG. 4, is clamped between the clamping arm such as the arm 14f and the support plate 14b. The clamping lever 14a or 14b is biased towards its clamping position illustrated in Figure 4 by elastic means such as coil springs 14i and 14j (Figure 1). In the clamping position illustrated in FIG. 4, the clamping arm 14f is braced on the support plate 14h, in an inclined position towards the outer side, so that traction exerted by the strip of material to be stretched 2 tends to rotate the clamping lever 14a in the direction of increasing clamping.
Le galet supérieur central de guidage vertical 13 est monté dans un logement 13a (figures 2, 6 et 9), et est tenu dans ce logement par un axe transversal 13b (figures 1 et 9). The upper central guide vertical roller 13 is mounted in a housing 13a (Figures 2, 6 and 9), and is held in this housing by a transverse axis 13b (Figures 1 and 9).
Comme on le voit plus en détail sur la figure 9, le galet supérieur central de guidage vertical 13 comporte un roulement à billes ayant une bague intérieure 13h montée sur l'axe transversal 13b lui-même engagé dans des alésages latéraux 3c et 13d du logement 13a. As can be seen in more detail in FIG. 9, the upper central guide roller 13 comprises a ball bearing having an inner ring 13b mounted on the transverse axis 13b itself engaged in lateral bores 3c and 13d of the housing. 13a.
L'axe transversal 13b comprend une bague épaulée 13e et une vis 13f. The transverse axis 13b comprises a shoulder ring 13e and a screw 13f.
L'épaulement de la bague épaulée 13e est engagé dans l'alésage latéral 13c, tandis que la tête 13g de la vis 13f est filetée et se visse dans l'alésage latéral 3d lui-même taraudé. La tige 13b de la vis 13f, qui forme l'axe transversal, est lisse, engagée à faible jeu dans la bague épaulée 13e, son extrémité libre s'engageant à faible jeu dans l'alésage latéral 13c du corps principal de pince 7. The shoulder of the shoulder ring 13e is engaged in the lateral bore 13c, while the head 13g of the screw 13f is threaded and is screwed into the lateral bore 3d itself threaded. The rod 13b of the screw 13f, which forms the transverse axis, is smooth, engaged with little play in the shoulder ring 13e, its free end engaging a small clearance in the lateral bore 13c of the main clamp body 7.
En position assemblée illustrée sur la figure 9, l'épaulement de la bague épaulée 13e forme une première butée de positionnement latéral de la bague
intérieure de roulement 13h, s'opposant au déplacement du galet supérieur central de guidage vertical 13 vers le côté intérieur 5 de la pince 1. De même, la tête 13g de la vis 13f forme une seconde butée de positionnement latéral de la bague intérieure de roulement 13h, s'opposant au déplacement du galet supérieur central de guidage vertical 13 vers le côté extérieur 6 de la pince 1. In the assembled position illustrated in FIG. 9, the shoulder of the shoulder ring 13e forms a first lateral positioning stop for the ring 13h inner bearing, opposing the displacement of the upper central guide vertical roller 13 towards the inner side 5 of the clamp 1. Similarly, the head 13g of the screw 13f forms a second lateral positioning stop of the inner ring of the rolling 13h, opposing the displacement of the upper central guide vertical roller 13 towards the outer side 6 of the clamp 1.
Pour le montage du galet supérieur central de guidage vertical 13, on engage la bague épaulée 13e dans la bague intérieure 3h du galet 13, puis on engage l'ensemble ainsi formé dans le logement 13a, et il suffit ensuite d'insérer la vis 13f dans la bague épaulée 13e pour fixer l'ensemble. For the mounting of the upper central vertical guide roller 13, the stepped collar 13 is engaged in the inner ring 3h of the roller 13, then the assembly thus formed is engaged in the housing 13a, and then it suffices to insert the screw 13f. in the shoulder ring 13e to fix the set.
Le fond de pince 8, comme illustré sur les figure 1 à 4, 7 et 8, porte des galets inférieurs aptes à rouler sur les faces latérales du rail de guidage 3 (figure 4). Ces galets inférieurs comprennent une paire de galets inférieurs intérieurs de guidage latéral 15 et 16, et une paire de galets inférieurs extérieurs de guidage latéral 17 et 18, qui sont tous montés sur des axes verticaux respectifs tels que l'axe 18a du galet 18 ou l'axe 17a du galet 17. The clamp bottom 8, as illustrated in FIGS. 1 to 4, 7 and 8, carries lower rollers capable of rolling on the lateral faces of the guide rail 3 (FIG. 4). These lower rollers comprise a pair of inner lower lateral guide rollers 15 and 16, and a pair of lateral lower lateral guide rollers 17 and 18, which are all mounted on respective vertical axes such as the axis 18a of the roller 18 or the axis 17a of the roller 17.
Le fond de pince 8 est rapporté sur le corps principal de pince 7, et fixé à l'extrémité inférieure de l'aile latérale intérieure 7a. Une vis verticale 19 relie en outre le fond de pince 8 à l'aile transversale supérieure 7b du corps principal de pince 7, pour assurer la rigidité de l'ensemble. The clamp bottom 8 is attached to the main clamp body 7, and attached to the lower end of the inner side wing 7a. A vertical screw 19 further connects the clamp bottom 8 to the upper transverse flange 7b of the main clamp body 7, to ensure the rigidity of the assembly.
Simultanément, la vis verticale 19 assure la liaison avec un maillon de la chaîne 4, pour relier la chaîne 4 à la pince 1. Simultaneously, the vertical screw 19 connects with a link of the chain 4, to connect the chain 4 to the clamp 1.
L'ensemble formé par le corps principal de pince 7 et le fond de pince 8 assemblés, tel qu'illustré sur les figures, présente ainsi la forme générale d'un « U » couché à ouverture totale dirigée vers le côté extérieur 6 de la pince 1. Autrement dit, selon le côté extérieur 6 de la pince , le profil en « U » est entièrement ouvert, dépourvu d'ailes latérales extérieures venant recouvrir les galets 1 1 , 12, 17 et 18. The assembly formed by the main clamp body 7 and the gripper base 8 assembled, as illustrated in the figures, thus has the general shape of a "U" lying with total opening directed towards the outer side 6 of the 1. In other words, according to the outer side 6 of the clamp, the "U" profile is fully open, devoid of outer lateral wings coming to cover the rollers 1 1, 12, 17 and 18.
Comme on le voit plus spécialement sur la figure 8, le fond de pince 8 comprend des cavités 8a, 8b, 8c, 8d et 8e ouvertes sur sa face supérieure, et des orifices de passage 8f, 8g, 8h, 8i (figure 2) permettant le passage des résidus graisseux vers le bas. Les passages 8f-8i sont bordés de lèvres annulaires inférieures, favorisant le détachement des gouttes de résidus graisseux pour éviter leur accumulation. As can be seen more specifically in FIG. 8, the gripper bottom 8 comprises cavities 8a, 8b, 8c, 8d and 8e open on its upper face, and passage orifices 8f, 8g, 8h, 8i (FIG. 2). allowing the passage of fatty residues downwards. The passages 8f-8i are lined with lower annular lips, favoring the detachment of drops of greasy residues to prevent their accumulation.
Les orifices de passage 8f-8i des résidus graisseux sont ménagés dans le fond des cavités de réception 8d et 8e, communiquant avec les cavités ouvertes 8a, 8b et 8c.
Les cavités 8a, 8b, 8c, 8d et 8e comportent un fond plat ou à pente descendant vers les orifices de passage 8f-8i. The passage orifices 8f-8i of the greasy residues are formed in the bottom of the receiving cavities 8d and 8e, communicating with the open cavities 8a, 8b and 8c. The cavities 8a, 8b, 8c, 8d and 8e have a flat bottom or downward slope towards the through holes 8f-8i.
Comme on le voit sur les figures, notamment la figure 7, les galets inférieurs 15-18 ne sont pas encastrés dans les cavités 8a, 8b et 8c, mais ils surmontent ces cavités et se trouvent selon un plan situé au-dessus des rebords des cavités 8a, 8b et 8c. As can be seen in the figures, in particular FIG. 7, the lower rollers 15-18 are not embedded in the cavities 8a, 8b and 8c, but they overcome these cavities and lie in a plane situated above the edges of the cavities 8a, 8b and 8c.
De la sorte, les résidus graisseux éventuellement projetés par la rotation des galets inférieurs 15-18 peuvent s'échapper vers le côté extérieur 6 de la pince 1 , sans retomber dans le fond de pince 8. In this way, the greasy residues possibly projected by the rotation of the lower rollers 15-18 can escape towards the outer side 6 of the clamp 1, without falling back into the clamp bottom 8.
De même, les galets supérieurs 9-12 se trouvent au-dessous de l'aile transversale supérieure 7b, et les projections de résidus graisseux produites par la rotation des galets supérieurs 9-12 peuvent s'échapper selon le côté extérieur 6 de la pince 1 , sans retomber dans le fond de pince 8. On réduit ainsi l'accumulation de résidus graisseux dans le fond de pince 8. Similarly, the upper rollers 9-12 are below the upper transverse flange 7b, and projections of greasy residues produced by the rotation of the upper rollers 9-12 can escape according to the outer side 6 of the clamp 1, without falling back into the clamp bottom 8. This reduces the accumulation of greasy residues in the clamp bottom 8.
La présente invention n'est pas limitée aux modes de réalisation qui ont été explicitement décrits, mais elle en inclut les diverses variantes et généralisations contenues dans le domaine des revendications ci-après.
The present invention is not limited to the embodiments which have been explicitly described, but it includes the various variants and generalizations thereof within the scope of the claims below.
Claims
REVENDICATIONS
1 - Pince (1 ) de maintien pour guider et tenir une bande de matériau à étirer (2), ladite pince comprenant : 1 - forceps (1) for guiding and holding a strip of material to be stretched (2), said clip comprising:
- un corps principal de pince (7), comportant une aile latérale intérieure (7a) solidaire d'une aile transversale supérieure (7b) qui porte des galets supérieurs (9- a gripper main body (7), comprising an inner lateral wing (7a) integral with an upper transverse wing (7b) which bears upper rollers (9-);
13) aptes à rouler sur une face supérieure et deux faces latérales opposées d'un rail de guidage (3) d'une machine d'étirement de bande, 13) adapted to roll on an upper face and two opposite lateral faces of a guide rail (3) of a belt stretching machine,
- un fond de pince (8) rapporté sur le corps principal de pince (7), portant des galets inférieurs (15-18) aptes à rouler sur les faces latérales du rail de guidage (3), - a clamp bottom (8) attached to the main clamp body (7), carrying lower rollers (15-18) capable of rolling on the lateral faces of the guide rail (3),
- des moyens de serrage de bande (14), montés sur le corps principal de pince (7), et aptes à tenir un bord de la bande de matériau (2) selon un côté intérieur (5) de la pince (1 ), band clamping means (14), mounted on the main clamp body (7), and able to hold an edge of the material strip (2) along an inner side (5) of the clamp (1),
caractérisée en ce que : characterized in that
- l'aile transversale supérieure (7b) est généralement plate et dépourvue d'aile latérale extérieure, de sorte que le corps principal de pince (7) présente, en section transversale, la forme générale d'un « L » retourné. - The upper transverse flange (7b) is generally flat and devoid of outer lateral flange, so that the main body clamp (7) has, in cross section, the general shape of a "L" returned.
2 - Pince (1) selon la revendication 1 , caractérisée en ce que : 2 - Pliers (1) according to claim 1, characterized in that:
- le fond de pince (8) est généralement plat, orienté parallèlement à l'aile transversale supérieure (7b), dépourvu d'aile latérale extérieure, et fixé à l'extrémité libre de l'aile latérale intérieure (7a), - the clamp base (8) is generally flat, oriented parallel to the upper transverse flange (7b), devoid of outer lateral flange, and fixed to the free end of the inner lateral flange (7a),
- l'ensemble formé par le corps principal de pince (7) et le fond de pince (8) assemblés ayant ainsi la forme générale d'un « U » couché à ouverture totale dirigée vers le côté extérieur (6) de la pince (1). the assembly formed by the gripper main body (7) and the collet base (8) assembled thus having the general shape of a "U" lying with total opening directed towards the outer side (6) of the clamp ( 1).
3 - Pince (1) selon l'une des revendications 1 ou 2, caractérisée en ce que le fond de pince (8) comprend des cavités (8a, 8b, 8c, 8d, 8e) ouvertes sur sa face supérieure et comportant des orifices (8f-8i) de passage des résidus graisseux. 3 - Pliers (1) according to one of claims 1 or 2, characterized in that the clamp base (8) comprises cavities (8a, 8b, 8c, 8d, 8e) open on its upper face and having orifices (8f-8i) passage of fatty residues.
4 - Pince (1) selon la revendication 3, caractérisée en ce que les cavités (8a, 8b, 8c, 8d, 8e) comportent un fond plat ou à pente descendant vers les orifices 4 - Pliers (1) according to claim 3, characterized in that the cavities (8a, 8b, 8c, 8d, 8e) have a flat bottom or slope down to the orifices
(8f-8i). (8f-8i).
5 - Pince (1) selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le ou les galets supérieurs (13) comportent un roulement à billes ayant une bague intérieure (13h) montée sur un axe transversal (13b) engagé dans des alésages latéraux (13c, 13d) d'un logement (13a) du corps principal de pince (7).
6 - Pince (1) selon la revendication 5, caractérisée en ce que l'axe transversal (13b) comprend : 5 - Pliers (1) according to any one of claims 1 to 4, characterized in that the or the upper rollers (13) comprise a ball bearing having an inner ring (13h) mounted on a transverse axis (13b) engaged in lateral bores (13c, 13d) of a housing (13a) of the main clamp body (7). 6 - Clamp (1) according to claim 5, characterized in that the transverse axis (13b) comprises:
- une bague épaulée (13e) dont l'épaulement forme une première butée de positionnement latéral de la bague intérieure de roulement (13h), - a stepped ring (13e) whose shoulder forms a first lateral positioning stop of the inner race ring (13h),
- une vis (13f) à tige (13b) et tête (13g), la tige (13b) étant engagée dans la bague épaulée (13e), la tête (13g) formant une seconde butée de positionnement latéral de la bague intérieure de roulement (13h). - a screw (13f) with rod (13b) and head (13g), the rod (13b) being engaged in the shoulder ring (13e), the head (13g) forming a second lateral positioning stop of the inner race ring (13h).
7 - Pince (1 ) selon la revendication 6, caractérisée en ce que : 7 - Clamp (1) according to claim 6, characterized in that:
- la tige (13b) de vis (13f) est lisse, et son extrémité libre s'engage à faible jeu dans un alésage latéral (13c) du corps principal de pince (7), - the rod (13b) of screw (13f) is smooth, and its free end engages a small clearance in a lateral bore (13c) of the main body of clamp (7),
- la tête (13g) de vis (13f) est filetée et se visse dans un alésage taraudé (13d) du corps principal de pince (7).
- The head (13g) of screw (13f) is threaded and is screwed into a threaded bore (13d) of the main body clamp (7).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/FR2011/051324 WO2012168566A1 (en) | 2011-06-10 | 2011-06-10 | Clip for stretching a film |
Publications (1)
Publication Number | Publication Date |
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EP2718091A1 true EP2718091A1 (en) | 2014-04-16 |
Family
ID=44629772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP11740958.1A Withdrawn EP2718091A1 (en) | 2011-06-10 | 2011-06-10 | Clip for stretching a film |
Country Status (3)
Country | Link |
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EP (1) | EP2718091A1 (en) |
CN (1) | CN103687714A (en) |
WO (1) | WO2012168566A1 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2803473B1 (en) * | 2013-05-16 | 2016-04-13 | Andritz AG | Dual tenter clip and table assembly and transverse sheet stretching plants comprising same |
DE102013017011A1 (en) | 2013-10-14 | 2015-04-30 | Brückner Maschinenbau GmbH & Co. KG | Clips transporting unit |
DE102017117420A1 (en) * | 2017-08-01 | 2019-02-07 | Brückner Maschinenbau GmbH & Co. KG | stretcher |
DE102019127701A1 (en) * | 2019-10-15 | 2021-04-15 | Brückner Maschinenbau GmbH & Co. KG | Clip carriage for a transport chain arrangement of a stretching system and an associated stretching system |
CN117644644B (en) * | 2024-01-30 | 2024-04-05 | 合肥东昇智能装备股份有限公司 | Double-zipper clamp |
CN118181729B (en) * | 2024-05-13 | 2024-07-23 | 合肥东昇智能装备股份有限公司 | Light-duty small-pitch double-zipper clamp |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61295955A (en) * | 1985-06-25 | 1986-12-26 | Mitsubishi Heavy Ind Ltd | Stretching machine |
FR2686041B1 (en) | 1992-01-13 | 1996-07-19 | Darlet Marchante Tech Sa | CROSS-DRAWING DEVICE FOR THE MANUFACTURE OF BIORIENT FILMS. |
DE19708620C1 (en) * | 1997-03-03 | 1998-08-27 | Dornier Gmbh Lindauer | Guide rail for clamping clips in stretching machines, especially film stretching machines |
US5970589A (en) * | 1997-09-11 | 1999-10-26 | Hitachi, Ltd. | Simultaneous biaxial stretching apparatus and method |
JP3942250B2 (en) * | 1997-12-10 | 2007-07-11 | 東芝機械株式会社 | Film transverse stretching machine |
CN1287972C (en) * | 2002-01-16 | 2006-12-06 | 富士胶片株式会社 | Tenter device |
CN1486836A (en) * | 2003-08-12 | 2004-04-07 | 中国科学院长春应用化学研究所 | Bidirectional mechanical film stretcher |
DE102008021506A1 (en) * | 2008-04-30 | 2009-11-05 | Lindauer Dornier Gmbh | Device for transverse stretching of film webs |
-
2011
- 2011-06-10 WO PCT/FR2011/051324 patent/WO2012168566A1/en active Application Filing
- 2011-06-10 EP EP11740958.1A patent/EP2718091A1/en not_active Withdrawn
- 2011-06-10 CN CN201180071534.8A patent/CN103687714A/en active Pending
Non-Patent Citations (1)
Title |
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See references of WO2012168566A1 * |
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WO2012168566A1 (en) | 2012-12-13 |
CN103687714A (en) | 2014-03-26 |
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