DE2706586C3 - Device for building blanks for pneumatic tires or rubber cord sleeves - Google Patents

Description

The invention relates to a device for building blanks for pneumatic tires or rubber cord sleeves, with a rotatable one on an axle shaft Building drum secured against radial displacement, which is formed by segments through Tongue and groove connections are guided on expanding cones and ί can be moved radially, which are close to their Edge guides attached to the end faces and guided on the axle shaft can be moved along the building drum are, as well as with devices for the formation of edge bulges, which on the end faces of the building drum

ίο are slidable and mechanisms for lifting and Include rolling the edges of the layers applied to the building drum.

It is a device for building pneumatic tires known (DD-PS 13 633). This well-known facility contains a rotating building drum that has a Has a plurality of segments, which are arranged radially displaceably by an expanding cone, which is in the Inside the building drum is housed. The building drum is driven by one through this drum The expansion cone is designed to interact with the Segments with their radial displacement to increase the diameter of the building drum, d. H. for spreading them, along the shaft the same slidably arranged. The segments of the The building drums are secured against axial displacement by a disk attached to the drive shaft secured.

Such an arrangement of the expanding cone in

However, the inside of the building drum limits the possibility of reducing the diameter this drum in the collapsed state. The transfer of the rotary movement to the building drum via the shaft passed through this drum namely prohibits the diameter of the building drum in the collapsed state over a certain To reduce the dimension, because the shaft must have a certain cross-section in order to be able to Torque and the bending force of devices to be able to record the rolling of the edges of the cord layers applied to the building drum and of the protector. All of this does not allow. tires to be built with a small seat diameter.

It is also a device for building

Blanks of pneumatic tires known (US-PS 23 67 831), which has a rotating building drum which is formed by segments which are radially formed by expanding cones are movable, which are movable on guides along the building drum and in the vicinity of its end face are arranged and in which the building drum and the expanding cone are mounted on an axle shaft, which with the expansion cone is in forced engagement by means of screw thread and with the building drum their protection against axial displacement connected is, the round guides coaxially to this Axle shaft are rotatable and arranged to be slidable back and forth and with the expanding cones for displacement the same are rigidly connected along the building drum, the segments of the building drum against over the expanding cones through radial tongue and groove connections applications are performed and the shifting of the Expanding cone into the interior of the building drum and back on the shaft coupled to the expanding cone by means of a threaded connection.

However, such a known device has also has the disadvantage that the building drum is arranged on a shaft, the bending loads as well as those originating from the torques

Is exposed to loads, so that this wave must have a sufficient strength for this purpose, whereby the possibility of reducing the diameter of the building drum to produce small tires is limited. The i Displacement of the expanding cone along the shaft by means of the threaded connection, the technological manufacturing cycle of blanks of pneumatic tires, which degrades the workability of the facility

The aim of the present invention is to eliminate these drawbacks.

The object underlying the invention is to provide an improved device for building To create blanks of pneumatic tires and rubber cord sleeves of the type mentioned, in which all Devices are so with each other in mutual action that they during the folding the drum ensure minimal dimensions of the same, so that with the same device The production of blanks for small tires and rubber cord sleeves is also guaranteed

The object is achieved in that the axle shaft is freely supported in the expansion cones and one of the Round guides is connected to the drive device for rotating the building drum, while the other round guide for removing the blanks from the building drum together with the expanding cones is removable from the building drum, each expansion cone having radial ribs, the outer surface of which Form parts of a cylindrical surface, the diameter of which corresponds to the outside diameter of the building drum is approximated and the cross-sectional side flanks diverge radially outward so that the flanks of the Grooves formed between them for receiving and radial guidance of radial ribs of the segments run parallel to each other.

Such an interconnection of the mechanisms of the device allows them to be more compact To create the construction method and to ensure a safe transfer of the rotary movement to the building drum. The rigid attachment of the expanding cone to the round guides and the transmission of the rotary movement also provide to the building drum via one of them the possibility of the axle shaft of the building drum from to relieve the torque and the bending force caused by the cord layers and the protector rolling devices goes out whereby the diameter of the axle shaft and therefore also the The diameter of the drum in the collapsed state can be further reduced.

Due to the design of the expansion cones with radial ribs, the diameter of which approximates the outer diameter of the building drum, and the cross-sectional side flanks of which diverge radially outward so that the flanks of the grooves formed between them for receiving the radial guidance of the radial ribs of the segments run parallel to one another enables the ribs on the expansion cones and segments to be used as guides for the radial movement of the segments and as elements for transmitting the rotary movement to the segments of the building drum and for further circular guidance. The fact that the outer surfaces of the radial ribs form parts of a cylindrical surface, the diameter of which approximates the outer diameter of the building drum, makes it possible to use these outer surfaces of the ribs as a support surface for the cord layers, whereby the dimensions of the building drum are considerably reduced can be. The ribs that are present also make it possible to considerably increase the lifting of the segments, which is necessary for the mechanized formation of the edge beads.

The ribs of the segments of the building drum advantageously have projections for centering on the end faces one bead ring each when it is placed on the building drum.

It is also useful if each expansion cone has a shaft on which an annular conical approach to interact with the mechanism for lifting the edges of the layers is appropriate

Such a design makes it possible to move the roll-on fields in to move the pressed state to the bead area of the tire cover.

It is beneficial if the axle shaft for connection with the building drum is a transverse through-going one Has oval hole, which is zugeo'aiet a sleeve with a continuous oval hole. where the two oval bores form a groove into which a projection from one of the segments of the building drum engages and that the segments of the building drum each have a recess on the outer surface, wherein the depressions in their entirety form a groove in which a flat spiral spring is housed

This makes it possible to prevent the segments from being longitudinally displaced with a small disk diameter to fix and the building drum with a small diameter at maximum possible Shape lifting of the segments.

It is useful if the round guides for circulation together with the building drum in bearings are stored and formed hollow and if the axle shaft passes freely through one of them

Such a design makes it possible to fix the axis against longitudinal displacement and its allow common circulation with the drum.

The device according to the invention offers the possibility of blanks of pneumatic tires and rubber cord sleeves with a small diameter, a high degree of mechanization and a good quality of formation of the Build edge bead, the building drum can be folded up so strongly that on You can also make small blanks of pneumatic tires and rubber cord sleeves, with smaller ones Dimensions of the drum in the collapsed state are made possible in particular in that the shaft is relieved of both bending loads and loads from torques.

In the drawing, an embodiment of the subject matter of the invention is shown. It shows

Fig.! an overall view of the invention Device partly in longitudinal section,

F i g. 2 the position of the expansion cone and the building drum in the folded state in longitudinal section,

F i g. 3 shows a section along the line HI-III according to FIG. 2,

Fig. 4 a part of the axle shaft with the sleeve, partly in longitudinal cut,

F i g. 5 is a top view according to FIG. 4,

F i g. 6 shows a section along the line VI-VI according to FIG. 1,

F i g. 7 shows a spatial representation of a. Expanding cone, partially cut open,

F i g. 8 the position of the expansion cone and the building drum in the expanded state, in longitudinal section,

9 and 10 show the working process of the formation of edge ridges of a blank of air-

tires.

The device for building blanks of pneumatic tires contains a on a frame 1 (Fig. I) assembled building drum 2, a drive device 3 for rotating the building drum, a mechanism for expanding the building drum 2, in the form of expanding cones guided by means of tongue and groove connections 4 and 4a is executed as well as devices for the formation of edge beads on the blank to be built up of pneumatic tires that can be displaced on the end faces of the building drum 2 and towards and away from it are arranged and mechanisms 5 and 5a to I live the edges of the cord layers and mechanisms 6 and 6,7 for rolling the edges of the cord layers included. Hieroei, the frame 1 consists of two large parts, the in the description as frame 1 and frame L-), as shown in FIG. 1 is shown.

The building drum 2 and the expanding cones 4 and 4a are arranged on an axle shaft 7 (FIG. 2), the axle shaft 7 being free. that is, rotatably and longitudinally displaceable in the .Spreizkegeln 4 and 4.1 and is connected to the building drum 2 to secure the same against axial displacement. For this purpose, a sleeve 9 is attached to the axle shaft 7 by means of pins 8.

The building drum 2 is formed from segments IO (Fig. 3) which are radially movable by the expanding cones 4 and 4a. The outer surface of the segments IO forms a cylindrical surface II of the drum 2.

lcdes of the segments IO points on its the axle shaft 7 facing side a rib 12. The ribs 12 (FIG. 2) have projections 13 on the end faces. which is oriented along the axle shaft 7 and for centering the bead rings 14 which form the edge bead of the tire are determined when putting them on. The segments 10 of the building drum 2 are attached to the sleeve 9 of the Axle shaft 7 pressed and held on her with the help of rubber belts 15, which are at the ends of the Building drum 2 are located.

If the building drum 2 has a small diameter. so the backup takes place before a Shift along the axle shaft 7 in the following way, t-.ines the begmente ΐυ points at its radial tip I ^ (Fig. 3) a radial projection 16. while in the Axle shaft 7 (Fig. 4) and in its sleeve 9, respectively continuous oval bores 17 and 18 are arranged which in their entirety form a groove 19 (FIG. 5), in which the projection 16 (Fig. 2) of the segment 10 is housed. The remaining segments 10 of the The building drum is connected to the segment having the projection 16 by means of a flat spiral spring 20 connected. For this purpose, indentations are present in the segments 10 on the outer surface, which in their The whole form a groove 21 (FIG. 3) in which the flat spiral spring 20 is located

The expansion cones 4 and 4a (FIG. 2) are attached in the vicinity of the end faces of the building drum 2, and each of them has a cylindrical cavity. in which the axle shaft 7 is freely supported, as shown in FIG. 2 shows. The expansion cones 4 and 4a are rigidly attached to round guides 22 and 22a, respectively, which are rotatably arranged on the same axis as the axle shaft 7 and can be pushed back and forth. For this purpose, the round guides 22 and 22a are mounted in bearings 23 (FIG. 6) which are located in guides 24 and 24a (FIG. 1) which are arranged on the frame 1 or ta.

The round guide 22 is connected to the drive device 3 for carrying out the rotary movement of the drum 2, while the round guide 22a is arranged in this way with the possibility of carrying it away from the building drum 2 together with the expanding cone 4a. that the axle shaft 7 emerges from the expansion cone 4a during removal, which makes it possible to remove the finished blank of the pneumatic tire from the drum 2 without hindrance.

The connection of the round guide 22 (Fig. I) with the drive device 3 is carried out by means of a chain drive 25. The drive device 3 consists of an electric motor 26, a gear 27 and the Chain drive 25, the driven sprocket 28 of which on the round guide 22 by means of a splined shaft connection attached and against axial displacement together with the round guide 22 by means of a washer 29 (Fig. 6) is secured. which is stuck on the guide 24.

For a removal of the circular guide 22; » (Fig. 1) Together with the expansion cone 4a of the building drum 2, this round guide 22a is arranged together with the guide 24a in the upper part 30 of the frame la, which upper part is slidably mounted on the middle part 31 of the frame la. Here, the middle part 31 is in turn arranged displaceably on the lower part of the frame Xa . To move the upper part 30, a compressed air cylinder 32 is provided in the device, the housing of which is attached to the central part 31 of the frame and the piston rod 33 of which is connected to the upper part 30 of the frame la.

To move the middle part 31, a compressed air cylinder 34 is provided in the device, the housing of which is attached to the frame ta and the piston rod of which is connected to the middle part 31 of the frame \ a . The compressed air cylinders 32 and 34 are arranged one above the other in the horizontal plane and are oriented perpendicular to one another, as a result of which the parts 30 and 31 can be displaced in directions perpendicular to one another in the horizontal plane.

The displacement of the round guides 22 and 22.7 together with the expanding cones 4 and 4a along the Axle shaft 7 takes place by means of pairs of compressed air cylinders 35 and 36, respectively. The housings of compressed air cylinders 36 are in the upper part 30 of the Gesieüs ia umi u'ic Gciiäusc the compressed air cylinders 35 are fastened in the frame 1. The piston rods 37 and 38 of the compressed air cylinder 35 and 36 are rigidly connected to the housings of the bearings 23 (FIG. 6) via cross members 39.

The expansion cones 4 (Fig. 2) and 4a have radial ribs 40 and 40a, respectively. The outer surfaces of the radial ribs 40 and 40a form parts of a cylindrical surface 41 and 41a (Fig. 2 and T * whose diameter approximates the outer diameter of the building drum 2. The side flanks of the radial ribs 4a diverge radially outward, so that the flanks of the between them Grooves 42 formed for receiving the radial guidance of the radial ribs 12 of the segments 10 run parallel to one another.

The base 43 of each groove 42 of the expansion cones 4 and 4a is designed with an incline, as shown in FIG. 2 and 7, the ribs 12 of the segments 10 are accommodated in the grooves 42, the lower surface of the segments 10 having an inclined surface 44 (FIG. 7) while the ribs 40 and 40a have an inclined surface 45, which it allows when the building drum 2 is folded to bring about their engagement with the Spreizkegelü 4 and As , a bevel 46 is provided in the lower part of the ribs 12 of the segments 10, which extends during the movement of the expansion cones 4 and 4a over the

Base 43 of the groove 42 moves.

Each expansion cone 4 (FIG. 2) and 4a has a shaft 47 on which an annular, conical extension 48 is attached to interact with the respective mechanisms 5 and 5a (FIG. I) to live the edges of the cord layers.

The round guides 22 (FIG. 2) and 22a are designed to be hollow for receiving the axle shaft 7 when the building drum 2 is folded up. Here, the axle shaft 7 is overhung in a bearing 49 (FIG. 1) and passes freely through the guide 32, which enables this axle shaft 7 to rotate together with the building drum 2. Here, the rotary movement is transmitted to the drum 2 from the drive device 3 via the chain drive 25, the round guide 22, the expanding cone 4 and its ribs 40 (FIG . 2). which interact with the ribs 12 of the segments 10 of the drum 2. Since the segments 10 are connected to the axle 7 via the sleeve 9, the latter runs together with the building drum 2. The rotary movement is transmitted from the building drum 2 via the expanding cone 4, i to the circular guide 22a .

The mechanisms 5 and 5a (Fig. 1) for lifting the edges of the cord layers applied to the building drum of the devices for forming the edge bead contain compressed air cylinders 50 (Fig. 8) arranged on the respective cylindrical round guides 22 and 22a. and on axles in the housing of the compressed air cylinder 50 attached I lebel 51. At the ends of the levers 51 on the front sides of the building drum 2 annular roll springs 52 are freely arranged. On the levers 51 rollers 53 are attached for cooperation with the annular, conical lugs 48.

The mechanisms 6 and 6a (F ι g. 1) for rolling on the Edges of the cord layers of the devices for forming the edge bead contain compressed air / '. Hand 54. the the frame 1 and the upper Τ ·.:; ι 10 of the frame l. < are attached, and jackets 55 (Fig. 8). the on the piston rods of the compressed air / ". iinder 54 arranged are. On the jacket sections 55 are sliding pieces> '> attached by rotatable discs 57 radially

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The sliders 56 are intended to hold the bead rings 14 firmly when they are placed on the projections 13 of the ribs of the segments 10 with the building drum 2 spread apart.

In the device there is a rolling mechanism (FIG. 1) for rolling the additional cord layers and the protector, which can have any structural design, which is why it is not described in detail here. The compressed air cylinders 34, 35, 36, 50 and 54 are actuated in any desired manner, the air supply to the compressed air cylinders 50 taking place through the cavities of the round guides 22 and 22a.

The device works in the following way:

In the starting position, the round guide 22a with the expanding cone 4a is in a released state with respect to the building drum 2. The Wuistrings 14 are placed on the sliders 56. Thereafter , the middle part 31 of the frame Xa together with the upper part 30 arranged thereon and the round guide 22a on the expanding cone 4a is adjusted by means of the compressed air cylinder 34 (Fig. 1) in alignment with the axle shaft 7 and the building drum 2, and the compressed air cylinder 32 is used the upper part 30 of the frame la with the round guide 22a and the expanding cone 4a moved towards the building drum 2, whereby the axle shaft 7 enters the cavity of the expanding cone 4a (Fig. 2) and the ribs 12 of the segments 10 in the grooves 42 ( Fig. 7) engage between the ribs 40 of the expansion cone 4a. The building drum 2 is in the folded state, as shown in FIG. 2 is shown.

The cord layers are placed on the folded building drum 2 in such a way that the ends of the cord layers intended to form the beads on the ribs 40 and 40a of the expanding cones 4 mn! 4a, ie Ulf, the cylindrical surfaces 4t and 41a lie. Then the drive device 3 (Fig. I) is switched on and the rotary movement is transmitted via the chain drive 25 to the round guide 22 and the expanding cone 4, the radial ribs 40 (Fig. 2) of which with the ribs 12 of the segments 10 of the building drum 2 cooperate, which begins to rotate and in turn cooperates with the ribs 40a of the Npreizkegels 4a of the Kundlführung Zia together with the building drum 2 also rotates the axle shaft 7, which is connected to it via the projection 16 housed in the groove 19.

Thereafter, the building drum 2 is expanded in the middle of the expansion cones 4 and 4a (Fig. 1), which are moved together with the guides 22 and 22a by the compressed air cylinders 35, 36 against each other. The force from the air cylinders 35 and 36 is via the! : a \ erse: i 39 and the bearings 23 of the RundfOhrun-L ".: 11 22 and 22a transferred. The latter move together with the expanding cones 4 and 4" towards the Mitu . Ke-.ienrad 28 of the chain drive 25 from the disk 29 'Fig. 6) is held in the previous position. ■ v, (behind the lever 51 (Fig. 9) to relax the I \ iieru 52 together with the roll springs 52 and the RiiTiiiführungen 22 and 22a under the ends 59 of a < odiage 60, which on the ribs 40 and 40a of the Since the expansion cones 4 and 4a are displaced relative to one another, the ribs 12 of the sectors 10 move over the base area 43 and 42. This causes the radial movement of the segments

Ribs 40 and 40a of expansion cones 4 and 4a as guides for them. The expansion of the building drum 2 takes place in this way, as shown in FIG. 8 is shown
Thus, those lying on the segments 10 are

Corcilagen

a given diameter

stretched. D.ioei their ends remain on the levers 51 (Fig. 9). The jacket sections 55 are then shifted to the end faces of the expanded drum 2 by the compressed air cylinders 54 with the sliding pieces 56 attached to them and bead rings 14 placed on them. The bead rings 14 are then glued to the edges of the layers of the cord lying on the projections 13 of the ribs 12 of the segments 10.

The sliders 56 are then moved apart radially in the disk 57. Thus, the bead rings 14 are now placed on the projections 13 of the ribs 12 of the segments 10 that center them. The levers 51 with the roll-on springs 52 and the ends 59 of the cord layers lying on them are moved apart by moving the compressed air cylinder 50 (FIG Surface of the approaches 48 are forced. Here are the

Roll springs 52 (Fig. 9) until they come into contact with the The inner surfaces of the sheath wefts 55 are raised and press the edges of the cord layers against the cord layers.

By means of the compressed air cylinder 54, the jacket shots 55 shifted one after the other to the center of the drum 2, the roll springs 52 catch on their way with the enderi 59 of the cord layers on them 60 and bring them onto the cylindrical surface 11 of the building drum 2 by rolling onto the folded edges of the cord layers, as shown in FIG. I () is shown. In the return, the Mantelschüssc 55 bring the roll-on springs 52 to the levers 51, which are in the Return to the starting position.

A protector is then placed on the central layers 60 and with the aid of the rolling mechanism 58

10

(Fig. I) angerc'lt. The expansion cones 4 and 4a are then shifted in opposite directions by means of the compressed air cylinders 35 and 36 and removed from the center of the drum 2, whereby the construction

Ί drum 2 under the action of the rubber belts 15 is collapsed. By means of the compressed air cylinder 32, the round guide 22a moves with the expanding cone 4a from the building drum 2 and is discharged sideways by the compressed air cylinder 34. The built

M th blank of the pneumatic tire is removed from the drum. Then on the sliders 56 the Put on bead rings for a subsequent tire, and the expanding cone 4a together with the guide 22a occurs when the air cylinders 32 and 34 decrease

ι ■> the building drum 2 on.

In addition 5 sheets of drawings

Claims (4)

Patent claims: 1. Device for building blanks for pneumatic tires or rubber cord sleeves, with a rotatable building drum secured on an axle shaft against radial displacement, which is formed by segments that are guided by tongue and groove connections on expanding cones and are radially movable, which are in the Round guides attached near their end faces, guided on the axle shaft, are movable along the building drum, as well as with devices for forming edge beads, which are displaceable on the front sides of the building drum and contain mechanisms for lifting and rolling the edges of the layers applied to the building drum, characterized that the axle shaft (7) is freely supported in the expanding cones (4, 4a) and one of the round guides (22) is connected to the drive device (3) for rotating the building drum (2), while the other round guide {22a) is connected to Removal of the blanks from the building drum (2) together with the expanding cones (4a) from the building drum l (2) is removable, each expansion cone (4, 4a) having radial ribs (40, 40a), the outer surface of which forms parts of a cylindrical surface (41, 4IaJ, the diameter of which approximates the outer diameter of the building drum (2) and whose cross section -Side flanks diverge radially outward so that the flanks of the grooves (42) formed between them for receiving and radial guidance of radial ribs (12) of the segments (10) run parallel to one another. 2. Apparatus according to claim 1, characterized in that the ribs (12) dei "segments (10) of the Building drum (2) frontal projections (13) for centering a respective bead ring (14) in its Have on the building drum (2). 3. Apparatus according to claim 1, characterized in that each expansion cone (4 or 4a) has a shaft (47) on which an annular conical projection (48) for cooperation with the mechanism (5 or 5a) for lifting the edges of the layers (60) is attached. 4. Apparatus according to claim 1, characterized in that the axle shaft (7) for connection with the building drum (2) has a transversely continuous oval bore (17) with a sleeve (9) a continuous oval bore (18) is assigned, the two oval bores (17, 18) one Form groove (19) into which a projection (16) from one of the segments (10) of the building drum (2) engages and that the segments (10) of the building drum (2) each have a recess on the outer surface, wherein the recesses in their entirety form a groove (21) in which a flat spiral spring (20) is housed. 5 <Device according to claims 1 or 4, characterized in that the round guides (22 or 22a) for rotation together with the building drum (2) are mounted in bearings (23) and are hollow and that through one of them the axle shaft (7 ) passes freely.