EP0384161B1 - Device for mounting a tool on a shaft in a rotary machine - Google Patents

Abstract

A device for fastening a die, such as a semi-cylindrical element on a tool carrying cylinder, which includes each of the dies having parallel extending ribs provided either with oblique surface portions or an oblique surface, the carrier is provided with circular grooves corresponding to the ribs and longitudinally extending grooves crossing the circular grooves which support locking rods. The device also includes an arrangement for shifting the locking rods from a released position to a locking position. In one embodiment, each of the locking rods has a notch for receiving the ribs and is provided with an oblique surface for engaging the oblique surface portion of the rib to lock the rib in the circular groove as the rods assume a locking position. In a second embodiment, each of the circular grooves has an oblique side wall and each of the rods urges the rib against the oblique side wall to cause a locking of the rib in the groove.

Description

The present invention relates to a device for fixing a form of machining to a tool cylinder in a rotary machine such as can be encountered in a machine for converting cardboard boxes.

To reduce as much as possible the imprecision in the arrangement of the machining tools, and also to facilitate the change of these tools from one production series to another, it is usual to mount these tools beforehand on a "form" which is subsequently reported on the "tool holder" cylinder which may be the upper cylinder. The lower cylinder then carries a strip of elastomeric material and these two cylinders rotate at high speed in synchronism, simultaneously driving and transforming the elements to be treated.

A device of this kind is described in US Pat. No. 3,119,312, in which the form of machining takes the form of a portion of cylinder, for example made of wood, which is cut according to the exact arrangement and the outline of the tools in front be attached to it. The inner face of a shape is understood to mean the underlying face oriented towards the axis of rotation. These machining tools can then be inserted into the orifices of the form until their lower foot comes at the level of the internal periphery of the orifice, the upper working part of the tool then emerging from the external face. of shape.

In the current state of the art, a tool cylinder has a grid of orifices threaded to directly screw a form against this cylinder. Given the high speed of rotation of the cylinder, as well as the significant weight of the forms provided with their machining tools, the centrifugal forces appearing at the level of the form are substantial and they tend to tear this form out of the cylinder. It is therefore imperative, according to this technique, to screw this shape at very numerous points causing too long periods of immobilization of the machine during the exchange of such shapes. In addition, each screw must be individually tightened, it is not excluded that one or more may be forgotten, which requires a long and tedious check at the end of the maneuver to avoid any accident.

The object of the present invention is a device for fixing a form of machining to its tool-carrying cylinder allowing convenient and rapid assembly while ensuring real efficiency as regards the firm and systematic maintenance of this form. Such a device must also ensure a maximum bearing surface between the form and the cylinder.

These aims are achieved by means of a fixing device in which the machining form is provided on its internal face with a series of parallel arches of which all the faces on the same side have oblique parts oriented towards the outside and in which the tool cylinder has on its external face a first series of transverse circular grooves inside which the arches come to sit in correspondence of the machining shape, and a second series of longitudinal grooves, deeper than the first, in each of which is housed, held in the radial direction but movable in sliding, a rod-lock. These lock rods have at each circular groove a transverse notch which is at least as deep as the thickness of the arches. These rods are actuated by sliding by mechanical and / or pneumatic and / or electrotechnical means so that all the walls on the same side of the transverse notches engage the arches to lock them in their corresponding circular groove. Preferably, the form of machining are two semi-cylindrical shells, and the lock rods as well as their respective grooves have, seen in cross section, an inverted tee shape.

According to a first advantageous embodiment, the transverse circular grooves have a rectangular section and all the walls on the same side of the transverse notches of the bolt rods vis-à-vis which are positioned the oblique parts of the arches seated in the circular grooves are themselves oblique inwardly oriented. According to another advantageous embodiment, the transverse notches of the locking rods are parallelepiped. All the faces on the same side of the arches are then oblique facing outwards and all the walls on the same side of the transverse circular grooves lying opposite the oblique faces of the arches are themselves oblique and oriented. towards the inside.

According to a first variant, the mechanical means slidingly actuating each rod-lock in its longitudinal groove is a screw held fixed longitudinally but movable in rotation by the wall side of the cylinder at the end of the longitudinal groove. The head of this screw appears outside the cylinder, and the threaded part is engaged in a longitudinal threaded orifice drilled at the corresponding end of the lock rod.

• un moyen de renvoi en chaque extrémité de rainure longitudinale vers laquelle sont orientées les faces obliques des arceaux, ce moyen de renvoi agissant entre la paroi latérale du cylindre et un butoir prenant appui contre une partie de la tige-verrou,
• un vérin monté sur une partie fixe extérieure situées proche de la paroi latérale du cylindre opposée aux moyens de renvoi, et actionnant une plaque semi-circulaire de poussée qui, une fois le cylindre mis en une position prédeterminée, appuie simultanément sur tous les prolongements de tiges-verrous relatifs à l'une des deux coquilles semi-cylindriques pour la libérer du cylindre porte-outil, lesquels prolongements traversent, libre en coulissement, la paroi latérale du cylindre.

According to a second variant, the means for slidingly actuating the locking rods in their longitudinal groove comprise:

• a return means at each end of the longitudinal groove towards which the oblique faces of the arches are oriented, this return means acting between the side wall of the cylinder and a stopper bearing against a part of the lock rod,
• a jack mounted on an external fixed part located near the side wall of the cylinder opposite to the deflection means, and actuating a semi-circular thrust plate which, once the cylinder placed in a predetermined position, presses simultaneously on all of the extensions of rods-locks relative to one of the two semi-cylindrical shells to release it from the tool-carrying cylinder, which extensions cross, free in sliding, the side wall of the cylinder.

• un moyen de renvoi en chaque extrémité de rainure longitudinale vers laquelle sont orientées les faces obliques des arceaux, ce moyen de renvoi agissant entre la paroi latérale du cylindre et un butoir prenant appui contre une partie de la tige-verrou,
• deux vérins semi-annulaires situés sur la paroi latérale du cylindre opposée aux moyens de renvoi et dont chaque couronne semi-circulaire de poussée appuie simultanément sur tous les prolongements de tiges-verrous relatifs à l'une des deux coquilles semi-cylindriques pour la libérer du cylindre porte-outil lesquels prolongements traversent, libre en coulissement, la paroi latérale du cylindre.

According to a third variant, the means for slidingly actuating the bolt rods in their longitudinal groove comprise:

• a return means at each end of the longitudinal groove towards which the oblique faces of the arches, this deflection means acting between the side wall of the cylinder and a stopper bearing against a part of the lock rod,
• two semi-annular cylinders located on the side wall of the cylinder opposite the deflection means and each semi-circular thrust ring presses simultaneously on all the rod-lock extensions relative to one of the two semi-cylindrical shells to release it of the tool cylinder which extensions cross, free to slide, the side wall of the cylinder.

• la figure 1 est une vue en perspective d'une première forme de réalisation du dispositif de fixation dans laquelle l'une des parois des encoches sur la tige-verrou est oblique,
• la figure 2 est une vue en perspective d'une seconde forme de réalisation du dispositif de fixation dans laquelle l'une des parois des rainures circulaires transversales est oblique,
• la figure 3 est une vue en perspective d'une amélioration de la forme de réalisation de la figure 1 utilisant un vérin extérieure et,
• la figure 4 est une vue en coupe longitudinale d'une seconde amélioration de la forme de réalisation de la figure 1 utilisant deux vérins semi-annulaires intérieurs. La partie inférieure droite de la coupe est décalée pour faire apparaître un arceau assis dans sa rainure circulaire.

The invention is described below in more detail with the aid of working examples, without limitation, illustrated in the accompanying drawings in which:

• FIG. 1 is a perspective view of a first embodiment of the fixing device in which one of the walls of the notches on the lock rod is oblique,
• FIG. 2 is a perspective view of a second embodiment of the fixing device in which one of the walls of the transverse circular grooves is oblique,
• FIG. 3 is a perspective view of an improvement of the embodiment of FIG. 1 using an external jack and,
• Figure 4 is a longitudinal sectional view of a second improvement of the embodiment of Figure 1 using two interior semi-annular cylinders. The lower right part of the cup is offset to reveal an arch seated in its circular groove.

The proportions of many elements constituting the fixing device according to the invention, in particular the width of the grooves and arches relative to the outside diameter of the tool-carrying cylinder, have been appreciably exaggerated in the figures to better highlight the operating mechanisms described below.

As illustrated in FIG. 1, a machining form 100 is generally presented as a portion of a wooden cylinder in which cutting tools 120 are attached. The radius of curvature of this shape 100 is substantially equal to the outside radius of the tool cylinder 200 against which it is intended to be fixed. In the context of this invention, it has frequently been found to be more useful to use only two identical shapes each covering one half of a cylinder. This particular shape which is therefore semi-cylindrical, is referred to in the following description as a "shell" 100.

This shape or shell 100 is moreover provided on its internal face, therefore oriented towards its axis of rotation, with a series of metal arches 150 of rectangular section which each belong to a plane orthogonal to the axis of rotation. Each roll bar 150 is permanently fixed to the machining form 100 by screws 125, it being understood that any other solid connection means, by key for example, is also suitable.

According to the invention, all the lateral faces on the same side of the arches 150, on the left side in FIG. 1, have oblique parts 155 and oriented towards the outside. In other words, these arches 150 have a rectangular cross section but the parts 155 have a trapezoidal cross section whose inner face is wider than the outer face in contact with the shape 100 and one of the side faces of which is generally perpendicular to the form 100 while the other is oblique, presenting with the internal face of this same form 100 an angle between 30 and 60 degrees.

The tool cylinder 200 has a series of circular transverse grooves 210 which, in this case, have a also rectangular cross section of width and depth at least equal to the width and height of the corresponding arches 150 coming from sit there when installing the form.

This cylinder 200 also has a series of longitudinal grooves 260 hollowed out at regular intervals along the circumference of this cylinder. These longitudinal grooves 260 are deeper than the circular grooves 210 so that there can be accommodated in each of them a lock rod 270 held in the radial direction but movable in longitudinal sliding. To this end and as illustrated in FIG. 1, the rods 270 as well as the longitudinal grooves 260 have, seen in cross section, an inverted T shape. The T-shape of the groove can be obtained either by direct cutting using a special tool, or by cutting a first wider rectangular groove and by relating to the upper edges by screwing or welding two lips on either side. .

Each lock rod has at the intersection with each groove 210 a notch 275 of depth equal to these same grooves. The shapes or shells 100 being provided to be installed on the cylinder 200 so that each oblique part 155 sits in the notches 275, the wall 276 of the notch 275 being found opposite the oblique part 155 of the roll bar 150 is itself oblique but oriented downwards. This wall 276 presents with the horizontal bottom of the notch 275 an angle between 30 and 60 degrees, preferably identical to that existing between the oblique part 155 of the arch 150 with the internal face of the machining shape 100. In other words, the transverse notch 275 has a trapezoidal section, the internal face of which is wider than the external face, which itself is at least as wide as the groove 210, therefore that the internal face of the arch. 150.

To facilitate the positioning of the form or shell 100 on the cylinder 200, a notch 101 is provided on the lateral edge of the form 100 into which a lug 201 also penetrates on the lateral edge of the cylinder. Obviously, the lug can inversely belong to the shape and the notch is then cut in the edge of the cylinder.

The length of the latch rod 270 is such that it can slide in the longitudinal groove 260. In fact, the position of this latch rod 270 in this groove 260 is imposed by mechanical means which, in the embodiment of Figure 1 is a control screw 300. This control screw 300 is held fixed longitudinally but movable in rotation by the side face of the tool cylinder 200. The threaded portion 320 is engaged in a threaded hole 330 drilled with corresponding end of the locking rod 270. The screw head 310 emerges from the lateral face of the cylinder 200, therefore accessible to an operator.

As described above, the fixing device according to the invention is used in the following manner:
Each screw head 310 is first turned in such a direction, normally anti-clockwise, that the corresponding bolt rod 270 is moved towards the left lateral face of the cylinder. This rotation is carried out until the end of this bolt rod 270 abuts at the end of the longitudinal groove 260 close to the screw head 310.

In this position, the oblique wall 276 of each notch 275 is entirely out of the corresponding transverse circular grooves 210 and the opposite wall of the notch is flush with the right edge of the groove.

These grooves 210 then being entirely released, it is easy to introduce the hoops 150 there and to apply the machining form 100 completely against the cylinder 200. The operator must however take care not to reverse the right and left sides of this form 100, that is to say to respect the orientation of the oblique faces 155 of the arches opposite the walls 276 of each notch. Then it must adjust the angular position of the form 100 by sliding along the grooves 210 so that the oblique parts 155 are located in the notches 275 respectively, which occurs when the notch 101 engages in the lug 201. To avoid any orientation error, the external faces of the form 100 and of the cylinder 200 can also be marked with a longitudinal arrow.

The operator can then turn in the opposite direction, either clockwise, the screw heads 310 which moves the corresponding bolt-rods 270 to the right as shown in FIG. 1. During this movement rods, all the oblique faces 276 simultaneously engage the oblique faces 155 of the corresponding arches which are gradually forced inwardly pressing the shape 100 against the cylinder 200 better. Usual means, such as pawls can be used in place on the heads 310 to prevent any untimely rotation in the opposite direction during the machining operations.

In Figure 2 is illustrated a variant of the fixing device in which identical references are used to designate similar parts. In this variant, the form of machining or shell 100 is strictly identical to that described above. However, it should be noted that on this figure all of the faces facing right 156 of the arches 150 are oblique. As before, the tool cylinder 200 has a series of transverse circular grooves 211 and a series of longitudinal grooves 260 in which rods 270 slide under the action of control screws 300. On the other hand, in this variant, this are the walls themselves 212 of the circular grooves 211 situated opposite the oblique faces 155 of the arches 150 which are oblique oriented downwards.

In this configuration, the width of the grooves 211 at the level of the surface of the cylinder 200 must at least be equal to that of the internal face of the arch 150. The notches 280 cut in the bolt rod 270 at the intersection of each groove 211 preferably has a rectangular shape, that is to say that the two right and left walls are vertical.

When the form 100 is put in place on the cylinder 200, one begins, as before, to pull to the left all the lock rods 270 by turning the corresponding screw heads 310 anticlockwise . Once these rods 270 lock against the left end of the grooves 260, all the left walls 282 are flush with the corresponding edge of the groove 211. We can then engage the hoops 150 in the corresponding grooves 211, press the shape 100 against the cylinder 200 and slide this shape 100 circularly to engage the notch 101 in the lug 201. We then move all the rods 270 one after the other little by little to the right by turning the respective screw heads 310 clockwise. This has the effect of engaging all the edges 282 of notches 280 against the arch 150 in correspondence, then of pushing these arches, therefore the shape 100 also, to the right engaging each oblique face 155 of the arches 150 in the walls obliques 212 of their corresponding groove 211. As this engagement of the faces 156 against the walls 212, the shape 100 is pressed against the cylinder 200.

If indeed the size of such grooves 211 with oblique walls is more difficult to achieve, increasing the final cost of the cylinder, and if the mounting of the form 100 on the cylinder 200 actually involves a lateral translational movement which can jeopardize the accuracy the position of the tools, this variant has the advantage of achieving effective securing of this shape against the cylinder over the entire length of the hoops concerned.

It should be noted that the devices in FIGS. 1 and 2 can also be combined. Thus, the face opposite to the face comprising oblique parts 155 of the arch 150 (or the straight face in FIG. 1) can itself also be oblique oriented towards the outside by a possibly lesser angle, or between 70 and 80 degree. The initially vertical straight wall of each groove 210 is then also oblique and oriented inward at the same angle of between 70 and 80 degrees. Due to such an angle value, the lateral displacement of the form 100 on the cylinder 200 is small but the engagement of these sides in the corresponding walls of the grooves 210 is sufficient to take over part of the holding forces.

With a view to using only two semi-cylindrical shells 100 per cylinder 200, it has proved advantageous to provide a mechanical and pneumatic device making it possible to simultaneously actuate all the lock rods 270 of one half of the cylinder , and this independently of all the locking rods 270 belonging to the other half. Two embodiments of these means in relation to the fixing device described with reference to Figure 1 are shown in Figures 3 and 4 respectively. Of course, these means described below can be adapted with few modifications to the device described with reference to FIG. 2.

These means comprise in common, for each lock rod 270, a spring 400 acting between a nut 207 screwed into the right lateral face 205 of the tool-carrying cylinder 200 and a stopper 410 bearing on a lower tongue 271 of the lock rod 270. The nut 207 is there only to facilitate assembly and replacement, when necessary, of the spring 400, and it in fact constitutes an extension of the right side wall 205 of the cylinder. This spring 400 is held longitudinally by an internal rod 405. As shown in FIGS. 3 and 4, the oblique parts 155 of the arches 150 also being oriented towards the right side of the cylinder 200, the spring 400 tends to hold the rod 270 and the oblique faces 276 engaged in the arches 150.

In FIG. 3, the mechanical and pneumatic means further comprise a jack 460 mounted on a part station near the cylinder 200. This actuator actuates a support plate 450 having the shape of a half-crown parallel to the lateral face of the cylinder and located near the upper edge of this same face. Furthermore, each latch rod 270 has an extension 278, in the example of FIG. 3 in the form of a rod, sliding freely passing through the side wall of the cylinder.

When the plate 450 is put in the "withdrawn" position by the jack 460, all the springs 400 can move the rods-locks to the right, thereby engaging the shells 100 present on the cylinder. The ends of the extensions 278 then appear outside the lateral face in the form of nipples.

To take out a shell 100, it is first of all necessary, after stopping the machine, to turn manually or by means of the slow speed motor, the cylinder 200 so that all the pins of the bolt rods 270 relative to the desired shell have opposite the support plate 450. The jack 460 is then actuated pushing then, through the support plate 450, all the bolt rods 270 concerned to the right, thus compressing the springs 400 and releasing the shell 100.

In FIG. 4, the mechanical and pneumatic means comprise, located on the left side of the cylinder, two semi-annular jacks 430a and 430b enclosed in a carcass 435 secured to the cylinder 200 which it extends. Each cylinder acts between the wall of the carcass 435 and a half-crown 440a and 440b respectively. Each half-crown presses simultaneously on all the tabs 279 extending, at their left end, the rods-locks 270 relating to one of the two shells.

As we can better observe on the upper half of Figure 4 illustrating the device when the cylinder 430 is under pressure, the half-crown 440a is pressed against the left lateral face of the cylinder 200 by the cylinder 440a, pushing back there. even to the right the tabs 279 therefore the rods-locks 270. This sliding of the rods-locks takes place against the action of the respective springs 400 which are compressed between the part 271 / stopper 410 and the nut 207. This sliding results in a release of the hoops 150 of the form 100.

When the cylinder 430b is depressurized as shown in the lower left half of FIG. 4, the bolt rods 270 pushed back by their respective spring 400 (not shown) move the crown 440 to the left, crushing and partially emptying this cylinder. This sliding of the lock rods also causes a re-hooking of the arches 150. Thus, by simple control of the valve controlling the compressed air flow from the cylinder 430a or 430b, the operator can simultaneously engage or disengage all the arches corresponding to the either of the shells 100.

The lower right half of FIG. 4 illustrates the situation of the rectangular portion of the arch 150 in the circular groove 210.

Many improvements can be made to this fixing device in the context of this invention. By way of non-limiting example, the machining form 100 can also be made of metal. In this case, the hoops 150 can be an integral part of the machining form or be added by welding. Furthermore, the oblique faces of the arches 150 or of the wall 276 of the notch 275 or of the side wall 212 of the groove 211 may not be linear but concave or convex according to the respective technical advantages.

Claims (8)

1. Device for fastening a die (100) on a tool carrier cylinder (200) on rotary machine,
   characterized by the fact that the die (100) is provided on its inner side with an adequate number of parallel bows (150) of which all faces situated on the same side have oblique parts (155, 156) orientated outwardly, and also by the fact that the tool carrier cylinder (200) is provided on its outer side with a first row of circular crosswise grooves (210, 211) designed for taking up the said bows (150) corresponding to the die, and with a second row of lengthwise grooves (260) deeper than the first ones (210, 211) and which is to lodge radially held but mobile sliding a locking rod (270) having at the level of every circular groove (210, 211) a crosswise slot (275, 280) at least as deep as the bows (150) are broad, the rods (270) being caused to slide by mechanical means (300, 400) and/or pneumatic and/or electric and/or hydraulic means in such a way that all walls (276, 282) on the same side of the crosswise slots engage in the bows (150) in order to lock them within the corresponding circular grooves (210, 211).
2. Fastening device according to claim 1,
   characterized by the fact that the die (100) consists of two half-cylindrical shells.
3. Fastening device according to claim 1,
   characterized by the fact that the locking rods (270) and their respective grooves (260) have the shape of an inversed T viewed as a crosswise section.
4. Fastening device according to claim 1,
   characterized by the fact that the circular crosswise grooves (210) have a rectangular section and also by the fact that all walls (276) of the crosswise slots (275) of the locking rods (270) opposite which are positioned the oblique parts (155) of the bows (150) lodged within the circular gooves (210) are equally of oblique shape and orientated inwardly.
5. Fastening device according to claim 1,
   characterized by the fact that the crosswise slots (280) of the locking rods (270) are parallelipipedic and by the fact that all faces (156) of the same side of the bows (150) are oblique and orientated outwardly, and that all walls (212) of the circular crosswise grooves (211) situated opposite the oblique faces (156) of the bows (150) held themselves in the circular grooves (211) are equally of oblique shape and orientated inwardly.
6. Fastening device according to claim 1,
   characterized by the fact that the mechanical means causing every locking rod (270) to slide in its lengthwise groove (260) are actually a spindle (300) held fixed lengthwise but movable rotarily by the side wall of the cylinder (200) at the end of the lengthwise groove (260) whose head (310) appears outside the cylinder and whose threaded part (320) engages in a tapped aperture (330) arranged lengthwise at the corresponding end of the locking rod (270).
7. Fastening device according to claim 2,
   characterized by the fact that the means causing the locking rods (270) to slide within their lengthwise groove (260) comprise:

   - A returning means (400) at each end of the lengthwise groove (260) towards which the oblique parts (155) of the bows (150) are orientated, the said returning means (400) acting between the side wall (205) of the cylinder and an end-stop (410) pressed against a part (271) of the locking rod (270),

   - A jack (460) fitted on an outer fixed part situated close to the side wall of the cylinder opposite the returning means, and actuating a semi-circular pushing plate (450) which, as soon as the cylinder has taken up its predetermined position, simultaneously presses on all extensions (278) of the locking rods (270) connected to one of the two half-cylindrical shells in order to release it from the tool carrier cylinder (200), the said extensions (278) sliding freely across the side wall of the cylinder.
8. Fastening device according to claim 2,
   characterized by the fact that the means causing the locking rods (270) to slide within their lengthwise groove (260) comprise:

   - A returning means (400) at each end of the lengthwise groove (260) towards which the oblique parts (155) of the bows (250) are orientated, the said returning means (400) acting between the side wall (205) of the cylinder and an end-stop (410) pressed against a part (271) of the locking rod (270),

   - Two semi-annular jacks (430a, 430b) situated on the cylinder side wall opposite the returning means and whose semi-circular pushing rim (440a, 440b) simultaneously presses on all extensions (278) of the locking rods (270) connected to one of the two half-cylindrical shells in order to release it from the tool carrier cylinder (200), the said extensions sliding freely across the side wall of the cylinder.

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