CS202437B1 - Method of making the tyres and device for executing the same - Google Patents

Description

The present invention relates to a method of manufacturing tires and apparatuses for carrying them out which can be used in the tire industry, for example in the manufacture of motorcycle and bicycle tires.

Methods are known for manufacturing tires on conflicting production drums (e.g., British Patent Specification No. 733,206) by laying the cord layers on the drum, forming a belt, fitting the ropes into the bead when the drums expand, folding the ends of the cord layers onto the ropes tires and protector laying. The known method makes it possible to manufacture only one tire at a time on the drum, which considerably limits the work performance of the tire production.

Furthermore, a method of manufacturing tires is known which comprises forming a blank in the form of a tube of rubberized cord layers. The obtained blank is cut into strips of a predetermined width, and on each of the strips obtained, the cables are laid on the sheaths of the sheaths, whereupon the folding of the cord layers on the cables into the sheaths of the sheaths and the laying of the protector takes place. In the apparatuses for carrying out this method, the production expansion drums are connected to each other in a row and on them there is a tube-shaped blank formed from layers of rubberized cord. Thereafter, the obtained blank is cut into strips by means of a cutting device, after which the production expansion drums are separated from each other, and on each of them the tire production takes place in a known manner.

Indeed, this method and the tire manufacturing apparatus produce only a single tire, even though a multiple-tube tube blank has been formed at the initial moment. This also greatly limits the increase in work performance.

It is an object of the present invention to provide a method of manufacturing tires which allows a significant increase in working performance.

SUMMARY OF THE INVENTION The object of the present invention is to provide a method of manufacturing tires, and to provide a device for making them which, once a single tube-like blank has been fabricated, makes it possible to simultaneously manufacture these tires, again allowing increased productivity and tire manufacturing accuracy. improving the quality of the tires produced.

This object is achieved in that, in the context of a tire manufacturing process, which comprises forming a tube blank of rubberized cord layers, cutting it into strips of a predetermined width, placing the wires in the bead according to the number of strips cut, In accordance with the invention, all the strands are fitted to the bead of the jacket on the tube-like preform before it is cut into strips.

The apparatus for performing the method ob202437 includes production expansion drums which are arranged in a line in close proximity to each other to form a rubber-like tube blank and a device for cutting the tube-like blank into strips of a predetermined width, each from the production expansion drums is provided with annular grooves for the ropes to the shoe heels, a mechanism for radially expanding the drum sectors and a mechanism for folding the cord cords onto the heels to the shoe heels which includes radially and axially movable left and right parts of the sector; According to the invention, all the expansion drums are arranged on a common drive shaft and between these moving left and right parts of the sector are provided, which together with the expansion drum sectors form a common cylindrical surface for forming the workpiece blank the parts of the sector of all the mechanisms for translating the layers of cord onto the cables into the shoe feet are connected to each other by rods which run through opposite grooves of the guide discs, which are arranged on a common drive shaft under the sectors of each of the expansion drums.

This method and the tire manufacturing equipment make it possible to increase the working performance of the tire production by combining the working processes of putting the wires into the bead, cutting the tube-like blank, folding the cord layers onto the bead of the multi-tire, putting multiple pairs of wires into the beading of the sheaths, simultaneously cutting the tubular blank into strips and simultaneously folding at least the edges of the cord layers of the same name onto the wires into the beading of the sheathing. At the same time, in the manufacture of tire carcasses with an open bead pattern, it is possible to simultaneously fold the cord layers on all ropes into the bead of all manufactured tires. In addition, the quality of the tires is improved due to the same production conditions for multiple tires, as well as the cutting of the tubular blank after insertion of the wires into the bead when each cord is clamped and the wires are tightened into the bead.

The number of cord cuts required during cutting is reduced, thereby reducing the total labor cost of the pre-cutting operation and cutting the cord.

By combining the work steps of fitting the wires to the shoe heels, cutting the tubular blank to the belts and folding the cord layers onto the wires to the shoe heels, the design of the manufacturing equipment is simplified and the manufacturing process can be automated.

In addition, the simultaneous expansion of all the drums mounted on a single drive shaft and the simultaneous folding of the cord layers, for example first all right and then all left, increase the working performance of the device.

According to the invention, the drive shaft is hollow and has a sleeve axially displaceably disposed relative to the drive shaft on which the stops that cooperate with the rods of the left sectors of the sector are fixed, while a shifter displaceable in the axial direction with the stops which cooperate with the rods of the right-hand parts of the sectors, wherein longitudinal grooves for receiving the stops are made in the drive shaft and in the sleeve. This allows a significant reduction in the dimensions of the entire tire manufacturing equipment and simplification of the mechanism for folding the cord layers onto the wires into the beads of the sheath.

The pusher is expediently provided with pawls that cooperate with the sleeve while moving the pusher to the starting position, and the pusher is pushed through a bar that cooperates with the pawls to release them from the sleeve when it returns to the starting position, ensuring synchronous operation of the left and right parts of the sector.

Advantageously, roller stops cooperating with rods, which are secured in these grooves by rubber rings, are also provided in the grooves of the guide discs.

Thus, the method of manufacturing tires and devices for carrying out the present invention provides for improved tire performance, while improving product quality, simplifying manufacturing equipment, and automating the manufacturing process.

In the following, the invention is explained in a detailed description of the method and apparatus of the present invention, with reference to the accompanying drawings, in which:

FIG. 1 shows a schematic representation of the production of the tubular blank, FIG. 2 shows the arrangement of the wires into the sheaths on the tubular blank, FIG. 3 fitting the wires into the sheaths and cutting the tubular blank onto strips, FIG. Fig. 6 shows a schematic representation of a tire manufacturing device (for example two tires) according to the invention, in a partial longitudinal section, Fig. 8 shows a section along the lines VIII - VIII and a view in the direction indicated in FIG. 7 by the arrow A, FIG. 9, a section along the line IX - IX in FIG. 7, FIGS.

The tire manufacturing process according to the invention is carried out on production expansion drums 1 (FIG. 1) which are arranged in a line in close proximity to one another, in such a way that a predetermined number of layers of rubber cord can be wound on them. making more tires.

By winding the rubber cord in one or more layers on drums arranged in this manner, a tubular blank 2 is formed.

Then, a plurality of pairs of ropes 3 are placed on the bead (fig. 2) on the tubular blank 2 according to the number of tires to be made of the blank, the ropes 3 in the bead bead being arranged on the drums at their mounting positions. 1, the tubular blank 2 expands and the ropes 3 are firmly adhered to the cord, then between each pair of ropes 3 the tubular blank 2 is cut into strips 4 (FIG. 3) and the edges 5 of the cord layers formed are, as shown in FIG. 4, raised in any way and folded onto the ropes 3 into the feet of the sheath.

Thereafter, the treads 6 (with or without buffer rubber) are placed on the carcasses manufactured in this way, followed by stalling or beading. The drums 1 are then compressed and the finished tires 7 are removed.

Thus, multiple tires, for example four, are produced in one technological cycle, as shown in Figures 1 to 6.

In order to explain the method according to the invention, a detailed description of a tire manufacturing device, for example two, is provided, which is provided with two expanding drums 1 (Fig. 7) which are arranged in line in close proximity to each other to make the tubular blank from rubberized cord layers. and a device 8 for cutting the tubular blank into strips, which may be of any construction. The number of expansion drums 1 is determined by the number of tires to be produced at the same time.

Each of the production expansion drums 1 is provided with annular grooves 9 for the wires to the sheaths, a mechanism 10 for radially expanding its sectors 11 and a mechanism 12 for folding the edges of the cord cords onto the wires that include the existing radially and axially movable left and right portions 13 and 14 sector.

All production expansion drums 1 are mounted on a common hollow drive shaft 15, with movable left-hand portions 13 and right-hand portions 14 of sectors being arranged between the expansion drums 1 and on their faces 14, which together with the expansion drum sectors 11 form a common cylindrical surface 16, 7 and 8, to form a tubular blank.

Each of the mechanisms 10 (FIG. 7) for radially expanding the sectors 11 of the expansion drums 1 comprises a pair of levers 17 which are connected to the sectors 11 of the expansion drums 1 and to the bushes 18. which is supported by sliding bearings 20 on the drive shaft 15 and provided with any known axial displacement drive which is connected to the sleeve 19 by a cross-member 21. Longitudinal slots 22 are made in the sleeve 19.

Sector parts of the same name, for example left sector parts 13, of all cord-folding mechanisms 12, are connected to each other by rods 23, while right sector parts 14 are connected to each other by rods 24. L-shaped brackets 25 are fastened to them fastened to the left part 13 of the sector and the roller elements 26 (Fig. 9) which perform the folding and clogging of the edges of the cord layers and are in contact with the conical left edges 27 (Fig. 7) of the expansion drum sectors 11. 28, on which the right-hand sector parts 14 and roller elements 29 are fixed, which are in contact with the conical right edges 30 of the sectors 11 of the expansion drums 1.

The tie rods 23 are guided in opposing grooves 31 of the two guide discs 32, which are arranged below the sectors 11 in the expansion drum 1, in the plane of the left front elevation. The rods 24 are guided in the grooves 33 of the two guide discs 34, which are arranged below the sectors 11 in the expansion drum 1, in the plane of the right-hand elevation.

The guide disks 32 and 34 are secured to the drive shaft 15 by pins 35 which extend through the longitudinal slots of the sleeve 19.

In the hollow space of the drive shaft 15, a sleeve 37 is mounted on the sliding bearings 36 which is axially displaceable and is springed relative to the drive shaft 15 by a spring 38 which pushes it onto a nut 39 screwed onto the end of the drive shaft 15.

On the sleeve 37 at a distance equal to the length of one rod 23, the stops 40 are fixed which cooperate with the ends of the rods of the left-hand sections 13 of the sector. In this case, the rods 23 cooperate with the stops 40 by means of rollers 41, which can be fixed either at the ends of the rods or at the stops 40, which allow unrestricted movement of the rods in the radial direction during expansion or folding (compression) of the drum.

Inside the sleeve 37 a pusher 43 is provided with stops 44 movable in the axial direction by means of any known drive (not shown in FIG. 7) by means of a crossbar 42, the stops being spaced at a distance equal to the length of the rod 24 and cooperating In this case, longitudinal grooves 48 and 47 are provided in the drive shaft 15 and in the sleeve 37 for positioning the stops 44 and 40 in these grooves.

The spring 38 is disposed on the pusher 43 between the end face of the sleeve 37 and the stop 48, which is mounted on the drive shaft 15. The pusher 43 has an axial through channel through which a rod 49 is inserted, one end projecting into the rectangular transverse groove 50 while the other end, located in the latch punch 51, is provided with a stop 52 which cooperates with the restrictor 53, and in the latch punch 51 there is a spring 54 that abuts the stop 52 of the rod 49.

In the rectangular transverse groove 50 of the pusher 43 there are two pawls 55 which represent two L-shaped levers which are articulated in the pusher 43, one of the free ends 58 of each lever being for engaging the sleeve 37, while the other end 57 is intended to come in contact with the spring head 58 which is mounted in the pusher 43.

The latches 55 are intended to cooperate with the collar 37 while moving the collar 37 to the starting position and together with the pusher 43 provide means for axially moving the collar 37. Separation of the latches 55 from the collar 37 is accomplished by a rod 49 which cooperates with the latches 55 upon returning the collar 37 to home.

Roller stops 59 are provided in opposing grooves 31 and 33 of the existing guide discs 32 and 34 and are secured in grooves 31 and 33 by rubber rings 60 which still push the roller stops 59 onto the surfaces of the links 23 and 24.

since the described apparatus comprises two expanding drums 1 which allow the production of two tires simultaneously, it further comprises a tubular blank cutting device 8 which is arranged above the dividing line of the left sector parts 13 and the right sector parts 14 that separate the left and right expanding production drum 1 and which may be of any known construction.

On the production drums 1 (Fig. 10), if the drums have a minimum diameter D _min, rubberized cord layers are deposited and their ends are joined to form a tubular blank 2. Then, the expansion drums 1 at the locations of the annular grooves 9 are arbitrarily in this way the cables 3 are placed in the feet of the sheath. Then, for example, by means of a pneumatic drive, the sleeve 19 is moved to the left in the front view in the direction indicated by the arrow B in FIG.

Claims (1)

SUBJECT A method of manufacturing tires, which comprises making a tubular blank from layers of a rubberized cord, its expansion drums, thereby increasing the diameter to the maximum size (D _max J, i.e., the drums are expanding). into the annular grooves and by means of the cutting device 8 cutting the tubular blank 2 into strips 4. Thereafter, the pusher 43 is moved to the left in the direction indicated by the arrow C in Fig. 12. The force exerted by the pusher 43 is transmitted via stops 44 to the rods. The 14 sectors mounted on these rods are moved to the tapered edges 30 of the drum sectors 11, thereby causing a radial movement of the rods 24 between the stops 44. The roller elements 29 translate the edges of the cord layers over the right wires 3 into the shoe foot. In the left end position of the pusher 43 (FIG. 13), the latches 55 protrude from the punch 50 of the pusher 43 under the action of the spring head 58, rotate and come into contact with the end face 58 of the sleeve 37 as shown in FIG. When the pusher 43 returns (FIG. 14j), the sleeve 37 held by the latches 55, together with the pusher 43, moves to the right in the direction indicated by the arrow D. The force exerted by the stops 40 is transmitted to the rods 24 while the force exerted by the stops 44 is Hereby, the rods 23 of the left sector portion 13 slide the left tapered edges 27 of the drum sectors 11, thereby translating the cord layers over the left ropes 3 into the sheaths, while the rods 24 bring the right sector portions 14 back to their starting position. In the initial position of the pusher 43, the rod 49 cooperates with the restrictor 53 while compressing the spring 54. By pressing the ends 49 of the latches 55, the rod 49 disengages these latches away from the collar 37. Under the action of the spring 38, the collar 37 (Fig. 16) returns to its initial position, with the stops 40 and the rod 23 to the starting position. Then the other parts, for example the treads 6 (with or without buffer rubber), are placed on the obtained carcasses and then the sleeve 19 (Fig. 17) is moved to the right in the direction indicated by the arrow E, thereby introducing the levers 17 by moving the sectors 11 back to the starting position. The expanding drums 1 are folded and the finished tires 7 are removed. When laying the following layers of cord, the entire working process of tire production is repeated as described above.