SK287720B6 - Device for turning up the sidewalls of tyre - Google Patents

Abstract

A device for turning up the side walls is further provided with a locking device (17) for locking the levers (10) in their rest position against the centrifugal forces actuating by a rotating building drum (1) of a tyre casing. The each lever (10) having the additional locking device (17), which consists of a retaining connector (18) connected with a based body (2) and it is provided with an opening slot (19) and it is arranged substantially parallel with an axis of the building drum (1) of the tyre casing, and of a closing pin (22), which is arranged to the lever (10) and which is locking into the slot (19) in the rest position.

Description

Technical field

BACKGROUND OF THE INVENTION The invention relates to an apparatus for extending sidewalls of a tire of at least partially concave carcass onto a tire casing drum, the tire casing drum having a mechanism for expanding and extending the central regions of the tire carcass, the tire casing drum essentially consisting of two symmetrical to the center. the drums coaxial side by side and relative to each other axially movable hollow cylindrical base bodies, and these base bodies have a clamping mechanism for clamping on the cores of the cores fitted thereto facing each other, wherein the side wall stretching device consists of two symmetrical the center of the drum and the rim of the circumference and the coaxially arranged levers, which are provided with rollers on their carcass-side ends and on their carcass-away end are attached to the support body wherein the levers pivoted on the support body are displaceable from a crisis position in which the levers substantially coaxial to the tire building drum of the tire casing engage therein to a working position for extending the side walls in which the levers are their rollers on the concave carcass, they extend continuously in a radial plane against the tire building drum and are pivotable about the axis of the joint.

BACKGROUND OF THE INVENTION

In the classic manufacture of a new carcass with a carcass, a carcass drum with a horizontal axis of rotation is first applied to the tire inner tube or inner plate of the tire and sidewall, which are wound around the drum circumference, thereby bonding the unvulcanised rubber materials together this is done according to the requirements for later applied components.

Consequently, in particular for truck or commercial vehicle tires, profile reinforcing beads, for example the so-called "Chafer", can also be fitted with textile or metal strength beams, which are usually arranged so that the finished tire is between the core and "Chafrom". at least one carcass layer.

As a rule, one or two carcass layers, which consist of rubberized textile or metal strength beams, are generally applied. Depending on the requirements, the shoulder filler profiles, which have the function in the finished tires, are then arranged to create an alignment between the flat edge of the strip at the edges and the already undulating carcass outline at the edges of the strip.

Subsequently, the cores of the bead heels are slid over the drum by means of a carcass and centering device and are positioned. The bead cores and bellows drum are already available as preformed units manufactured on a separate drum and are slid laterally onto pre-fabricated rings already on the tire casing building drum.

When the carcass building drum is subsequently expanded, the base cores of the shoe and the flat carcass are radially opposed, so that the inner surfaces of the cores of the shoe are glued and connected to the outer surface of the carcass.

Then, the drum is lowered to a smaller diameter and the carcass with the cored cores fitted is again pulled by the carcass mechanism, and the centering of the cores is pulled out of the drum and transferred to the tire casing or drum.

In parallel to the carcass production, belt layers are usually applied to a belt building drum in a separate belt production line, which are usually formed as two or three rubberized steel cord layers and optionally equipped with one or two layers of nylon bandage. Strip cushioning strips may be provided between the individual belt layers. The tire tread, which is optionally provided with a bottom plate, is finally applied to this belt.

The traveling belt support mechanism for receiving the pre-fabricated belt bundle transports the thus-formed belt tread bundle to the swelling drum with the centered and pre-concave belt carcass and places it over the carcass of the tire casing.

Finally, it is concave and connected to the belt bundle, with the expansion, i.e., the carcass bulging, also of a stretching process in which the ends of the carcass layers, i.e. the outer sidewalls of the tire, are folded around the bead cores and the sidewalls of the tire are extended .

This process is carried out by means of bellows or cylindrical levers with rollers arranged around the circumference of the building drum, the central bellows expanding the central part of the carcass and lateral bladders, i.e. inflatable bellows, which occupy axially from the outside of the seated cores or roller levers which are to the radial planes opposite the building drum and moving their rollers upwardly on the side of the casing blank, they are used to pull the side portions upward.

After the carcass has been bulged and joined to the belt, the belt support mechanism is removed and the tire tread is wound together with the belt.

After releasing the bellows, the finished casing is then removed from the bulging drums by another conveyor and is vulcanized in the corresponding vulcanization mold, where it obtains its end position with a shaped tire tread profile, possibly also with the described or also decoratively arranged sidewalls.

However, the draw-up process by the side bellows has the disadvantage that even though these bellows are supported by pressing mechanisms, so-called "Pusher", which are additionally pressed against the sidewall of the tire, do not act up to the shoulder regions of the tire casing blank. manual machining.

In addition, the side bladders are subject to considerable wear, requiring frequent replacement, which means a great deal of time.

This can be avoided by using roller levers. However, these have the great disadvantage that additional winding can only be carried out with a very low number of revolutions of the tire casing drum, because, together with the tire drum, the rotating rollers with rollers are exposed to a high centrifugal force effect at high speeds. The rotation of the roller leads to the automatic lifting or breaking of the roller levers from the rest position, whereby the roller levers can be damaged (disrupted) when exposed to the surrounding machine parts and the operator can be exposed to a high risk.

DE 44 16 514 C2 discloses a winding and sliding portion of a ready-to-wear drum with L-shaped lever arms which are first loaded by flexible tension rings and can thus be brought back into their seating position. However, there is also the disadvantage that the spinning drum can only be driven at a slight number of revolutions during the rotation of the drum, since otherwise the levers could be lifted away from the drum by the inertia force.

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION It is therefore an object of the present invention to overcome these drawbacks and to provide a device for pulling the sidewalls of a tire with roller levers which, in conventional machining processes on a tire casing building drum, allows a sufficiently high number of drum rotations.

The invention is solved by the features of the main claim. Preferred further embodiments are contained in the dependent claims as set forth below.

Accordingly, the tire sidewall extending device of the at least partially concave carcass on the tire casing drum is provided, the tire casing drum having a mechanism for widening and swelling the central regions of the tire casing, the tire casing drum essentially consisting of two symmetrical the hollow cylindrical base bodies coaxially disposed relative to one another and axially displaceable hollow cylindrical base bodies, and the base bodies have a clamping mechanism for clamping the cores of the cores mounted thereon, the side wall stretching device being two symmetrical to the center of the drum and the rim of the circumference and the coaxially arranged levers, which are provided with rollers at their ends provided on the carcass side and articulated at their ends remote from the carcass an axle movable axially sliding on the base body, wherein the levers articulated to the support body are displaceable from a rest position in which the levers substantially coaxial to the tire casing drum of the tire casing therein to a working position for extending the side walls in which the levers are with their rollers on the concave carcass continuously expandable in planes radial against the tire drum of the tire casing and rotatable about an articulation axis, and wherein the tire sidewall extension device further comprises a locking mechanism for closing the levers in their rest position against centrifugal forces exerted A tire casing according to the invention, which is characterized in that each lever is associated with a locking mechanism comprising a retaining clip connected to the base body and provided with an open recess arranged substantially parallel to the tire building axis. a tire casing drum, and a locking pin which is arranged on the lever and which is retractable into the recess in the rest position.

Such a closure mechanism which allows the levers to be closed or locked in their rest position, i.e. in a state in which they essentially coaxially engage the circumference of the tire casing drum, in a simple manner in terms of centrifugal forces, allows for all processes carried out on the fabric. drum tires, where roller levers are not required, let the drum rotate at a higher speed and thus reduce the entire cycle time overall.

In such an embodiment of the device according to the invention, the closing devices themselves can be made relatively small, since only one lever must be secured against the action of centrifugal forces by a corresponding holding clamp at a time. Correspondingly formed by the individual small retaining clamps, also arranged on the circumference of the tire casing drum, with the opening removed, the locking or closing process is also simplified, since this locking alone can be carried out only by a very short axial displacement of the support body. the aim is to provide additional shunting paths in the range of 5 to 10 mm only.

According to a preferred embodiment of the invention, the closure mechanism is adapted to be actuated by the axial translational movement of the support body on the base body, the closure being performed as a positive fit and / or force contact between the base body and the levers.

By such an embodiment of the device, the working process necessary for stretching, which comprises the axial displacement / displacement of the support body or levers, can be used in the simplest way for locking or closing.

According to a further preferred embodiment, the closure mechanism is made as a base body surrounding and associated therewith with a ring having on its periphery a number of levers corresponding to a plurality of ridge-extending retaining clips. At the same time, these retaining clips can also be used as a radial guide for the levers during the expansion process.

Preferably, the support body is embodied as a tubular body surrounding the base body and is connected to an annular piston surrounding the base body and a pressure cylinder system mounted thereon, and thus is axially displaceable on the base body.

Such annular cylindrical systems, in which the cylinder or its individual components, i.e. the piston, the piston and the cylinder wall, surround the base body, are particularly suitable for the pulling device according to the invention, since rows of levers arranged coaxially around the circumference and coaxially the use of other mechanical drives for displacement for design reasons. However, a hydraulic or pneumatic actuator with such a closure mechanism for pulling the side walls upwards can be arranged without problems and reduces the overall complexity of the device.

Preferably, the levers are provided with spring or resilient means, for example rubber rings, that pull the levers back into their rest position in which they substantially engage radially on the tire building tire drum. Such resilient traction means, made, for example, of springs or as rubber strips placed around all levers, can also reduce the forces acting on the closure when influenced by the inertia force, so that the closure can be carried out by itself relatively light and the weight of the drum and there is no need to substantially increase the available power output.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained in more detail below with reference to the drawing. FIG. 1 is a cross-sectional view of a tire casing building drum with an apparatus for extending the sidewalls of a tire in an upward direction according to the invention.

Figure 2 shows one of the ring-shaped lever arms in cross-section with the closure mechanism.

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1, the upper half of the central section of the tire building drum 6 is shown in cross-section. This tire casing drum 6 has two hollow cylindrical base bodies 2, 21 which are axially displaceable relative to each other on corresponding guides (not shown here).

The base bodies have clamping mechanisms 3, S on their mutually facing end regions for clamping the cores 4, 41 mounted on the carcass 5. In the working position shown in figure 1, the base bodies 2, 21 are already for swelling between the cores 4 The internal pressure of the carcass 5 is pushed to one another so that the tire casing shown in Figure 1 has already been reached. The internal pressure required for expanding or extending the central carcass regions 5 is generated either by the inner bellows or, as shown. a moss-free method, by directly applying a pressure medium to the inside of the carcass 5.

The sealing is carried out here by means of bearings 6, G of cores 4, 41 formed as rubber rings by radially extending the elements of the clamping devices 3.31. Here, the elements of the clamping mechanisms are influenced for expansion by the pneumatic ring cylinders 7, T and by the articulated lever levers 8, 81 which are promised here.

In this case, the carcass 5 is made in the previous method as a flat structure, as already mentioned at the beginning of the description, moved by the carcass support mechanism 5 and the centering mechanism of the core 4, 41 through the tire casing drum 4, the base bodies 2, 21 the greatest distance from each other. Thereafter, the regions of the carcass 5 are fastened by means of the clamping mechanisms 3, 31, whereupon, by means of increasing dispensing, the base bodies 2, 2] are pushed together again to the end position shown in FIG. First

After bulging between the cores 4, 4], the areas of the carcass 5 abut with the outer side part still on the pulling device 9, 9], i.e. on the levers 10, 10 ', which are arranged symmetrically to the drum center and coaxial to the tire building drum I and which are equipped with rollers 11 at their carcass end.

In FIG. 1 shows the position of the rest of the lever 10, which can also be referred to as a roller lever, in which the lever 10 bears substantially coaxial to the tire building drum and the tire casing and its components, respectively, so that the rim of the roller levers 10 defines the outer circumference of tire building drum and tire casing.

To extend the sidewalls of the tire upwards, the rollers 10, 10 'with the rollers 11, 11' are then moved to the position shown in FIG. 1 on the right side, wherein the levers 10, 10 'with their rollers U, 11' move upwards on the concave skirt 5 while being expanded in a plane radial against the tire building drum 1. By moving all the circumferentially arranged levers 10, 10 'upwardly on the carcass wall, a pulling up and some sticking of those parts of the carcass 5 that have previously been placed on the roller levers 10, 10' from the outside of the cores 4 is effected. 4] that is the lateral outer sidewalls of the tire.

The roller levers 10, 10 'are connected by their rear ends to the support body 12, 12' by means of the joints 13, 13 ', which makes it possible in FIG. 1 shows a swivel movement on the right. The support body 12, 12 'in the embodiment shown here is in each case formed as a tubular body 14, 14' which surrounds the base body 2, 2] and which is connected to the annular piston 15, 15 'of the pressure cylinder system 16, 16'. it surrounds the base body 2, 2] and is fastened to it. The tubular body 14, 14 'is thus formed as a hollow piston which surrounds the base body 2, 2],

By means of this pressure cylinder system 16, 16 ', a ring of roller levers 10, 10' is formed. the corresponding support body 12, 12 'axially displaceable on the base body 2, 2], so that, with a given engagement at the rear end of the roller lever 10, 10', this lever 10, 10 'is moved upwards or upwards on the carcass 5 moves.

Thus, before the process and after the up-pulling process, the roller lever 10, 10 'is in its rest position, which is shown on the left side of FIG. 1 and is also shown in FIG. Second

There is also now a closure mechanism which allows the drums at high speed to be rotated prior to the process and after the up-stretching process to allow economically advantageous and rapid execution of other working processes.

The closure mechanism 11 ' used here according to the invention consists, as shown in FIG. 2, from a retaining clamp 18, 18 ', which is provided with an open recess 19, which is substantially directed through its opening parallel to the axis of the tire building drum 1.

The roller lever 10 here comprises a lever shoe 20 and a lever arm 21 which is screwed thereto and at the front end of which the roller 11, 11 'is rotatably mounted.

A closure bolt 22 is recessed into the lever bead 20, the dimensions of which are designed so that it can be inserted into the open recess 19 of the retaining clip 18, 18 ', and after reaching its seating position on the tire casing drum 1, another short piece is displaced axially back , so that its shut-off position is reached.

In this connection, each lever 10, 10 'is associated with a separate and cooperating retaining clamp 18, 18' and locking pins 22 consisting of a locking mechanism 17, 17 ', which makes it possible to make the locking mechanism 17, 17' relatively small in itself because each locking mechanism 17, 17 'must only secure one lever 10, 10' of the lever ring against the action of centrifugal forces.

As can also be seen from FIG. 2, the levers 10, 10 'are additionally provided with resilient traction means, which in this case consist of rubber rings 23 which surround the entire lever ring and are fixed in correspondingly formed grooves of the lever arms 21.

The retaining clips 18, 18 ', one of which is shown in FIG. 2 are part of a ring 24, 24 'which surrounds and is screwed to the base body and which has on its circumference a number of levers 10, 10' corresponding to a plurality of such ridge-like retaining clamps 18. 18 '.

By means of such a design, an additional guide of the lever foot 20 in the circumferential direction is achieved on the side surfaces of the retaining clips 18. 18 ', thereby reliably preventing the inclined movement or jamming of the levers 10, 10'. In FIG. 1, a lever 10 'is shown on its right side in its operating position in which the lever foot 20' is slidably guided by the side surfaces of the retaining clamps 18 '. that is to say their side faces abutting on both sides also when the lever 10] is pivoted or opened.

Claims (5)

PATENT CLAIMS An apparatus for extending sidewalls of a tire of at least partially concave carcass (5) onto a tire casing drum (1), the tire casing drum (1) having a mechanism for widening and dispensing middle regions of the tire casing (5), the tire casing drum (1) essentially consists of two symmetrically disposed, mutually axially movable hollow cylindrical base bodies (2, 2 ') symmetrically centered on the center of the drum, and these base bodies (2, 2') have on their end-to-end end-to-end clamping mechanisms (3, 3 ') for clamping on the carcass (5) of the cores (4, 4') fitted, wherein the side wall extending device consists of two symmetrically to the center of the drum and levers (10, 10 ') which are provided at their ends on the side of the carcass (5) with rollers (11, 11') and on their the ends remote from the carcass (5) are articulated to a support body (12, 12 ') which is axially displaceable on the base body (2, 2'), wherein the levers (10, 10 ') are articulated to the support body (12, 12'). 12 ') are displaceable from a rest position in which the levers (10, 10') substantially coaxial to the tire building drum (1) abut against it, to a working position for extending the side walls in which the levers (10, 10 ') by their rollers (11, 11 ') on the concave carcass (5) continuously expandable in planes radial against the tire drum (1) of the tire casing and are rotatable about a hinge axis, and wherein the tire sidewall extension device further comprises a closing mechanism (17); 17 ') for closing the levers (10, 10') in their rest position against the centrifugal forces exerted by the rotating tire building drum (1), characterized in that each lever (10, 10 ') is associated with a closing mechanism (17) , 17 ' ), comprising a retaining clip (18, 18 ') connected to the base body (2, 2') and provided with an open recess (19) arranged substantially parallel to the axis of the tire building drum (1), and a closing pin ( 22), which is arranged on the lever (10, 10 ') and which is retractable into the recess (19) in the rest position. Device according to claim 1, characterized in that the closing mechanism (17, 17 ') is adapted to be actuated by the axial translational movement of the support body (12, 12') on the base body (2, 2 '), the closing being effected as a positive fit and / or force fit connection between the base body (2, 2 ') and the levers (10, 10'). Device according to claim 1 or 2, characterized in that the closing mechanism (17, 17 ') is designed as a ring (24, 24') surrounding and connected to the base body (2, 2 ') on its the retaining clips (18, 18 ') protruding from the periphery in the circumference, corresponding to the number of levers (10, 10'). Apparatus according to claims 1 to 3, characterized in that the support body (12, 12 ') is designed as a tubular body (14, 14') surrounding the base body (2, 2 ') and connected to the annular piston (15). 15 ') of the pressure cylinder system (16, 16') surrounding the base body (2, 2 ') and mounted thereon, and so is axially displaceable on the base body (2, 2'). Apparatus according to claims 1 to 4, characterized in that the levers (10, 10 ') are provided with resilient or resilient means (23) for pulling the levers (10, 10') back to their rest position, in which the levers (10, 10 '). 10, 10 ') substantially coaxially abut the tire building drum (1).