FR2458384A1 - Bead ring setting machine - for pneumatic tyre mfr. has three pairs of grips separated by cutting mechanisms - Google Patents

Abstract

A machine for the setting of bead rings on the expanding assembly drum of pneumatic tyres consists of a carriage which can be moved on guideways and carries longitudinal rods on it uprights. These rods can be moved in the radial inward direction by power cylinders and carry pairs of grips for the bead rings. Each pair is sepd from the next by a cutting mechanism which remains outside the assembly drum during the cutting operation. Severl (three) pairs of bead rings can thus be set simultaneously, SO increasing the productivity. The whole design is simple and the combination of setting and cutting devices saves time resulting in a shorter cycle.

Description

 The present invention relates to equipment for making tire envelopes and in particular relates to a device for fitting rods on an extendable drum, in particular in an installation for the manufacture of tire envelopes.

There is a device known for the installation of rods, for example that produced according to the patent of FRG NO 1217602, comprising a movable carriage mounted on guides and carrying end uprights between which are placed groups of tightening for rods.

 This device ensures the supply of a single rod to the extendable drum and its installation on the drum. This is why, for making the envelope on the extendable drum, two devices of this kind are used, which are advanced on the drum from two sides. Consequently, the possibilities of increasing productivity during the manufacture of the envelopes are limited. In addition, the construction of this device does not allow it to be used for the simultaneous production of several casings on a single extendable drum, since during the simultaneous production of the tire casings it is essential to carry out all immediately after the installation of the rods, the simultaneous cutting of the tubular blank into bracelets.

 A device is already known for cutting tubular blanks into bracelets of given width, directly on the extendable drum of a garment machine, during the manufacture of tire casings in the transfer chains (for example, according to the U.S. Patent No. 3,375,151). The cutting element of this device consists of a circular knife rotating at high speed and capable of approaching the extendable drum. The cutting process is carried out, in this known device, in the following manner. The rotary knife is brought closer to the extendable drum on which a rubberized cable blank is placed, so that the knife touches the blank material, then the drum is rotated with the blank, or it is moved around the stationary drum the circular knife turning, thereby cutting the blank material along a circumference.

 The design of these known devices is complicated, because they are provided with several controls (control of rotation of the circular knife, control of feeding the cutting device to the making drum, control of feeding the circular knife to the cutting location ), as well as devices for protecting the circular knife. In addition, in known devices, the cutting process takes a long time, because the cutting of the blank takes place successively, along the circumference, during the rotation of the building drum.

I1 is practically not possible to use this device for the simultaneous cutting of the tubular blank into several bracelets, together with the known device for the installation of rods.

 It has therefore been proposed to develop a device for laying rods on an extendable drum, which would allow the simultaneous laying, on the extendable drum, of several pairs of rods, and the cutting of the tubular blank in separate straps, while reducing the technological process of manufacturing envelopes, increasing work productivity and improving the quality of the envelopes made.

This problem is solved by means of a device for laying rods on an extendable drum, of the type comprising a carriage to which a reciprocating rectilinear movement is printed along the extendable drum, mounted on guides and having vertical uprights which carry groups of clamping members for the rods, moved in the radial direction, said device being characterized, according to the invention by the fact that between the vertical uprights are arranged longitudinal rods mounted on these uprights with the possibility of moving radially, and that on said rods are fixed the groups of clamping members for the rods, cutting mechanisms being mounted between the groups of clamping members for each pair of rods so as to be able to move nadially, and located, during cutting, externally to the extendable drum.

 the presence, between the vertical uprights, of the longitudinal rods to which the groups of clamping members for the rods are fixed, being able to move radially, makes it possible to carry out the simultaneous installation (admission and transfer) of several pairs of rods in accordance with the number of envelopes to make, and to simplify the design of the device thanks to the combination of commands. By arranging the cutting mechanisms between the groups of clamping members for each pair of rods, we have succeeded in simplifying the design of the tailoring machine, because we have eliminated the command to move the cutting mechanisms to the area Thanks to the combination of the cutting mechanism with the device for installing the rods, the total time of their movements towards the construction drum or in the opposite direction has been reduced, which contributes even more to the increased productivity of envelope manufacturing operations.

It is advantageous that the groups of clamping members for each pair of rods are fixed on the longitudinal rods so that they can be unpinned -to be positioned along the extendable drum, using shoemakers or cups linked together by connection elements, which allows, in case of modification of the extension of the construction drum (for example when it is necessary to switch to the production of an envelope of another size), to quickly adjust the position of the clamping members rods according to the new extension.

 According to the invention, each clamping member has on its surface oriented towards the rod an elastic element and is mounted elastically relative to the longitudinal rod, * which ensures reliable maintenance of the rods, even in the case of ellipticity of those -this.

 The invention is also characterized in that the cutting mechanisms are mounted on the carriage using annular supports and include load-bearing elements on which the knives are fixed, and in that, for the radial movement of the cutting mechanisms , radial grooves are formed in the annular supports, in which are housed the carrier elements connected to a control for their radial displacement.

 This gives the possibility of carrying out the manufacture of the envelopes without moving the rod laying device away from the making drum, and also ensuring the precision of the approach of the knives of the drum and of adjustment of their position.

 It is also advantageous for the knives to be in the shape of an arc of a circle and for their total length to be chosen so as to envelop the extensible drum in its extended state along its entire circumference. This makes it possible to simultaneously cut the tubular blank into bracelets along the entire circumference of the blank.

 According to another alternative embodiment of the invention, the knives can be triangular in shape and their cutting edges can be arranged at an angle to an imaginary tangent of the extendable drum, the knives being mounted on the load-bearing elements by means of mounted intermediate sectors. resiliently with respect to said elements, carrying rollers and located in front of the cutting edges of the knives1 which excludes the dulling of the knives in the event of accidental contact with the surface of the drum. rollers and arranged in front of the cutting edges of the knives, it was ensured that they could be used for working with extendable drums of different diameters and the risk of dulling of the knives was eliminated.

In this way, the device proposed for the installation of rods is of simple design, ensures the admission and the simultaneous transfer to the construction drum of several pairs of rods according to the number of envelopes to be made, and also ensures the combination of rod installation operations and the cutting of the tubular blank into bracelets without unnecessary movement of these mechanisms, which increases the productivity of the manufacturing process and simplifies the construction of the entire garment machine, reducing the number of units of equipment required to manufacture the envelopes.

The invention will be better understood and other objects, details and advantages thereof will appear better in the light of the explanatory description which will follow of different embodiments given only by way of nonlimiting examples with reference to the non-drawing drawings. annexed limitative in which
- Figure 1 schematically shows an overview of a device for installing rods according to the invention;
- Figure 2 shows the arrangement of the clamping members on the longitudinal rod (on an enlarged scale);
- Figure 3 is a sectional view along III-III of Figure 1
- Figure 4 illustrates an alternative embodiment of the cutting mechanism, with partial cutaway
- Figures 5 and 6 illustrate the process of cutting the tubular blank by the mechanism shown in Figure 4;
- Figures 7 to 11 show the process of fitting the rods and cutting the tubular blank into bracelets. The device for laying rods on an extendable drum comprises a carriage 1 driven by an alternating rectilinear movement along guides 2 along the extendable drum, using a control 3 of an appropriate type known per se (not shown in Figure 1). On the carriage 1 are fixed vertical uprights 4 carrying longitudinal bars or rods 5 which can be moved radially using, for example, pneumatic cylinders 6.

The bodies of the pneumatic cylinders 6 are fixed to the uprights 4 (FIG. 2) and their rods 7 are connected to the longitudinal bars 5.

The ends of the longitudinal bars 5 are arranged in radial grooves 8 of the uprights 4. On the longitudinal bars 5, groups of clamping members 9 are fixed for each pair of rods, it being understood that for each rod at least two are used clamping members, each consisting of a plate in the form of a segment, as shown in FIG. 3. In each group, the clamping members 9 (FIG. 2) for each rod are separated by a distance L which corresponds to the distance between the lateral grooves intended to receive the rods and produced on the extendable drum 3. Each clamping member 9 is located in a case 10 mounted on the longitudinal bar 5, in a longitudinal groove 11 provided therein.

 In the clamping member 9 is formed a groove 12 in which is housed a spring 13 abutting against the bottom of the case 10, so that the clamping member 9 is resiliently mounted relative to the longitudinal bar 5. On the surface of the clamping member 9 which is oriented towards the rod, an elastic element 14 made, for example, of rubber has been fixed.

 For the positioning displacements of each pair of clamping members 9 along the extendable drum, that is to say for the change of the distance L between the clamping members, the housings 10 carry respective studs 15 and 16 on which is threaded right and left, respectively, and which are interconnected by a nut 17.

 Radially movable cutting mechanisms 19 are mounted on the carriage 1, between the groups of clamping members 9 (FIG. 1) for each pair of rods, using annular vertical supports 18. Each cutting mechanism 19 comprises carrier elements 20 (FIG. 3) and knives 21 mounted on the carrier elements 20.

 For the radial movement of the cutting mechanisms 19 (FIG. 1), radial grooves 22 have been made in the annular supports 18 in which the carrier elements 20 are located, these being connected to the control for the radial movement of the cutting mechanisms 19. As a control for the radial movement of the cutting mechanisms 19, it is possible to use a jack 23 (FIG. 1) placed on the carriage 1. The rod of this jack is linked by a bar 24 S of the rings 25 located in guides of the annular supports 18. In each ring 25, inclined grooves 26 are made (FIG. 3), the number of which is determined by the number of cutting mechanisms 19 located in the same cutting plane, between each pair of rods. In each groove 26 is disposed a finger 27 fixed on a carrier element 20. During the rotation of the ring 25, the finger 27 moves in the groove 26 and carries out the radial displacement of the carrier element with the knife 21.

 The knives 21 can be produced in different shapes, for example in an arc of a circle as shown in FIG. 3. Their cutting edge 28 is equidistant from the surface of the extendable drum 3 in the extended position. The total length of the cutting edges 28 of the knives 21 of the cutting mechanisms 19 arranged in the same plane is chosen so as to surround the extensible drum in its extended state along its entire circumference. The knives 21 can be triangular in shape, as shown in FIG. 4. Their cutting edges 29 (FIG. 5) are arranged at an angle to the imaginary tangent N of the extendable drum 3.

In accordance with this shape of the knives 21 (FIG. 4), fingers 30 are provided on the rings 25, and in the carrier elements 20 produced in the form of sectors are provided inclined grooves 31 in which the fingers 30 are engaged. In addition, in each carrier element 20 are produced two radial grooves 32 in which are placed rods 33 fixed on the annular supports 18 and acting as guides for the radial movement of the carrier elements 20.

 The knives 21 of triangular shape are mounted on the support elements 20 using intermediate sectors 34 resiliently mounted relative to the support elements 20 by means of springs 35 placed on rods 36 passing through the support elements 20. The intermediate sectors 34 have projections on which are fixed rollers 37 located in front of the cutting edges 29 of the knives 21. During cutting, the rollers 37 are in contact with the surface of the drum, applying the tubular blank 38 (Figures 5 , 6) against the surface of the drum 3.

 In the annular supports 18 (Figure 4) and in the rings 25 are formed grooves 39 through which pass the longitudinal bars 5 (not shown in Figure 4).

 The proposed device operates as follows.

On the extendable drum 3 placed near the device for laying the rods and coaxially with it (as shown in FIG. 7), a tubular blank 38 made of rubberized cable is formed in a manner known per se. At the same time, an extension mandrel 40 of a type known per se, with rods 41 placed on it, is introduced into the device for installing the rods (shown diagrammatically in FIGS. 7 to 11), along its axis. in the planes of the clamping members 9.On actuates the pneumatic cylinders 6, the rods of which move radially (that is to say towards the mandrel carrying the rods 41) the longitudinal bars 5 with the clamping members 9 , so that these come to tighten the rods 41 (Figure 8), each elastic element 14 then embracing the corresponding rod along its outer surface and preventing it from moving axially. Then the mandrel 40 is removed from the device, the carriage 1 is moved on the guides 2 towards the drum 3 (FIG. 9) and it is engaged on the latter by arranging it- so that the rods 41 are placed above the circular drum grooves (not shown in the figure),
The actuating cylinders 23 are then actuated (FIG. 1) and, by rotation of the rings 25, the cutting mechanisms 19 move towards the drum 3. After the knives have moved 21, the drum 3 is extended ( Figure 10), during which the rods 41 are blocked in the circular grooves of the drum and the knife blades 21 touch the tubular blank 38. Then the bars 5 are brought back to the initial position with the clamping members 9 at the using jacks 6. Then, during the rotation of the drum, the knives come into contact with the tubular blank 38 and cut it into bracelets 42. If the knives 21 are in the shape of an arc of a circle (in accordance with FIG. 3 ), the blank is cut during the rotation of the drum by a small angle. If the knives 21 are triangular in shape (FIG. 4), the blank is cut as shown in FIGS. 5 and 6, that is to say that the knives, during the extension of the drum, sink into the blank e and, during the rotation of the drum, their edges 29 cut the blank into bracelets 42.

After cutting the blank into bracelets 42, the cutting mechanisms 19 S are moved away from the drum using the control cylinder 23 * and they are returned to the initial position (FIG. 11). Then the entire device is moved away from the drum, and the tire is made on the latter in a manner known per se.

 Of course, the invention is in no way limited to the embodiments described and shown which have been given only by way of example. In particular, it includes all the means constituting technical equivalents of the means described as well as their combinations, if the latter are carried out according to the spirit and implemented in the context of the claims which follow.

Claims (6)

 1. Device for laying rods on an extendable drum, in particular for making tire casings, of the type comprising a carriage driven in a reciprocating rectilinear movement along the drum, mounted on guides and comprising vertical uprights carrying groups of members used for tightening the rods and radially movable, characterized in that, between the vertical uprights, are arranged longitudinal bars mounted on said uprights with the possibility of moving radially and on which said groups of fastening members are fixed tightening of the rods, and in that cutting mechanisms, arranged between the groups of clamping members of each pair of rods, are mounted so as to be able to move radially and, during cutting, are located at the outside of the extendable drum. 2. Device according to claim 1, characterized in that the groups of clamping members of each pair of rods are movably mounted on said longitudinal bars so as to be able to be moved and fixed in the desired position along the drum to the using bootmakers linked together by tensioning elements,  3. Device according to one of claims 1 and 2, characterized in that each clamping member has on its surface oriented towards the corresponding rod an elastic element, and is mounted elastically relative to said longitudinal rod.  4. Device according to one of claims 1, 2 and 3, characterized in that the cutting mechanisms are mounted on the carriage through the intermediary of annular supports and comprise carrying elements on which knives are fixed, and in that, to allow the radial movement of said cutting mechanisms, said annular supports have radial grooves in which are housed said carrier elements, these being connected to a control for their radial movement. 5. Device according to one of claims 1, 2, 3 and 4, characterized in that the knives are in the shape of an arc of a circle and that their total length is chosen so as to wrap the drum around its entire circumference. state of extension. 6. Device according to one of claims 1, 2, 3 and 4, characterized in that the knives are of triangular shape and that their cutting edges are arranged at an angle to the imaginary tangent of the extendable drum, said knives being mounted on said load-bearing elements by means of intermediate sectors resiliently mounted with respect to said elements and carrying rollers situated in front of the cutting edges of the knives.