DE2623546A1 - TRANSFER DEVICE FOR A TIRE BODY DRUM - Google Patents

Description

METZELER KAUTSCHUK AG g Hk "45 *

Turning device for a tire building drum

The invention relates to a folding device for a tire building drum, in particular for a full steel carcass building drum, by means of which the over the bead cores when the drum is expanded protruding carcass fabric edges are placed around the bead cores and rolled on.

Turning over the carcass fabric edges is one of the most time consuming when building full steel carcasses Operations. Usually this turning process is done with so-called "lollipops" carried out, which the tire manufacturer holds by hand under the edge and pulls up the The edge gradually wraps around the bead core. Since this edge is very resistant and for Tends to evade, pressure rollers can only be set at a point in time when the edge is already largely turned over. A well-known Umlegehilfsvorrichtung consists of one Handle on which a conical finger is rotatably mounted.

It is also known to use so-called bellows turning devices that are located in the tire building drum are permanently installed. By opening the bellows

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are blown, they roll the carcass fabric edges over the bead core. Bellows envelope systems but are only suitable for tire building drums, where the envelope bellows can be attached directly behind the bead mount. One such a drum is therefore either only suitable for one dimension, or the sausage mounts must be adjustable in the axial direction. In addition, bellows envelope systems need one great freedom to work. Because for the exact application of the individual layers of the cord fabric the feed members of the servicer are moved as close as possible to the drum surface must, the servicer station must always be in a separate operation from the building drum be pulled back.

The object of the invention is to provide a UmIegeeinrichtung To create the type mentioned above, with which the protruding carcass fabric edges mechanically flawless and can be turned over safely. The folding device should be used on carcass building machines be adaptable for a wide variety of carcass widths and thicknesses. The carcass fabric edge should be able to be folded down gently and rolled up at the same time.

The object is achieved by having several conical fingers and one plate-shaped finger in each support Pressure roller along a curved line section are rotatably mounted, the axis of rotation of the fingers extending in a common Hit point that the carrier slidable over a

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Swivel drive is pivotably mounted about an axis perpendicular to the longitudinal axis of the drum and the swivel drive itself can be moved parallel to the longitudinal axis of the drum. This immediately in the area of both carcass building drum edges installed folding device lays the carcass fabric largely gently and reliably around the bead cores and rolls the carcass edges at the same time firmly.

According to the invention it is also important that the plate-shaped pressure roller is rotatably mounted on a console and the console is arranged between the fingers on the carrier. Furthermore, it is advantageous if the plane of the plate-shaped pressure roller is inclined at an angle with respect to the two adjacent fingers and its circumference protrudes beyond the tips of the fingers at the front when the fingers are positioned perpendicular to the longitudinal axis of the drum. The pressure roller supports the folding process and, thanks to its special position, reliably rolls onto the edge of the carcass fabric. The protrusion of their front circumferential edge over the fingertips ensures that they cannot come into erasing engagement with the sensitive cord fabric. The edge of the carcass fabric has the tendency when it is turned over to slip repeatedly under the fingers acting on it. It is therefore important that he learns virtue of the largest Aufweitungs- in the circumferential direction of the last finger, so that he will once he again after a revolution definitely be back by the first finger of the transfer means underclings,

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is fed to the shifting device. The fingers are therefore increasing in the direction of rotation of the drum larger radial distances from the longitudinal axis of the drum arranged or - alternatively - in the direction of rotation of the drum with an increasingly larger diameter educated.

In a special embodiment it is provided that the last one in the direction of rotation of the drum Finger has a conical shape. As a result, the fabric edge is extremely widened, so that he cannot slip under the first finger when going around again.

The fact that the radius helps to largely protect the carcass fabric edge to be turned over the curved line on which the pivot points of the fingers are arranged, approximately the radius of the Drum corresponds. As a result, the relative speeds between the surfaces of the acting fingers and the surrounding edge of the carcass fabric are very small.

A further embodiment of the folding device provides that the plane of the disc-shaped pressure roller is inclined between 5 ° and 15 °, preferably between 8 ° and 10 °, against the adjacent fingers, so that the front edge of the roller when the fingers are approximately parallel to the drum circumference lies above the fingertips, while the rear edge of the roll and most of the side surface lie meridially below the fingers. This only works relative

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a small part of the surface of the pressure roller on the edge of the carcass fabric. Damage of the fabric due to excessive erasing forces is avoided. In addition, the inclination the pressure roller improves its effect when rolling.

When folding down and rolling on, it is important that the folding device exactly matches the contour of the carcass fabric, especially in the area of the bead, can follow. However, this should also include the Rolling process favoring forces are transmitted from the pressure roller. This will be done after a further embodiment of the invention thereby achieved that the carrier is slidably guided in a yoke and the pressure roller of one Working cylinder is applied approximately in the direction of its plane, this working cylinder is hinged between the yoke and console and monitors the movements of the carrier in the yoke. It is advantageous if the yoke is arranged displaceably on a support arm. This working cylinder presses the pressure roller and thus also the carrier with one of the respective work areas the pressure against the carcass fabric corresponding to the pressure roller.

In an expedient embodiment of the subject matter of the invention it is provided that the edge of the pressure roller is rounded and on the top of the roller against the center of the roller merges into a circumferential groove.

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The rounded edge of the pressure roller allows a perfect rolling process, while the rotating The fillet is specially tailored to the bead area of the carcass and the carcass fabric can press exactly against the bead core. Dor carcass fabric edge is used for the advanced Preformed rolling process.

Appropriately exist in the invention Folding device the fingers and the pressure roller are made of high quality steel and are about roller bearings or needle roller bearings. An anti-adhesive surface coating prevents it from being too strong Sticks to the sticky cord fabric and reduces the friction between those working on each other Surfaces.

A particularly high degree of efficiency of the shifting device is achieved when its area of action extends approximately over a quarter of the circumference of the drum.

In order to avoid air inclusions between the glued-together surfaces of the carcass fabric when rolling, provision is made for a first working cylinder with a pressure direction perpendicular to the longitudinal axis of the drum to be hinged to the swivel drive, the setting of which is limited by a stop. As a result, unevenness can be perfectly leveled out, while the limit stop ensures that the tips of the folding fingers do not rub against the surface of the carcass.

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The folding device according to the invention is particularly suitable for variable series production consistent quality and short work cycles. For this purpose it is intended that they Executes swiveling, pushing and pressing movements that overlap and are individually controlled will. The working pressures of the working cylinders can be controlled independently of one another.

The folding operations are preferably carried out simultaneously on both edges of the carcass. this is achieved with the folding device according to the invention when the edge regions of the drum a folding device is assigned to each and the two are arranged in mirror image to one another Shifting devices can be moved on a spindle with counter-rotating thread sections.

The movement of the folding device and its working pressures are preferably controlled by punch cards. This type of control saves tedious changeover work, if of the same carcass size has to be changed to another, since then only the one for the selected carcass size The planned work program is to be entered into the control apparatus in the form of a punch card.

According to a further, independent feature of the invention, it is proposed that the Edge areas of the drum stepped with the formation of a free space with respect to the drum circumference are. This drum rim design allows the

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easy and flawless access to the folding device according to the invention.

The folding device according to the invention does not place any requirements on the drum construction. she is also suitable for mounting on drums of the simplest design, e.g. for those where the dimensions have to be changed only by using different cuts in so-called easily exchangeable bead tensioning straps is made - suitable.

The invention is described in more detail with reference to the accompanying drawings. The figures show in detail:

1 shows a plan view of part of a carcass building drum with a laterally behind it Switching device;

2 shows a side view of the folding device;

3 shows a further embodiment of a folding device shown in FIG. 2;

4 shows a schematic detail of the folding device;

5 shows a schematic detail modified from the previous one;

6 shows the arrangement of the pressure roller;

Fig. 7 a, b, c three phases of the Unuegevorganges.

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In Figures 1 and 2, 1 is a part of a tire building drum, shown in particular a full steel carcass building drum. In the area of the edge is an annular groove 2 is provided. On the drum 1 a layer of a carcass fabric strip 3 is placed, which of a bead core 5 is constricted in the area of the annular groove 2. In this area of the annular groove 2 should be around the bead core 5 around the later bead of the carcass can be formed. The protruding carcass fabric edge 4 is due of the constricting bead core 5 is raised slightly in relation to the end of the drum 1. The edge of the drum has a shoulder at the end, whereby a free space 23 is formed below the drum edge, in which a folding device can be brought into action.

The shifting device consists of a swivel drive 6, which runs on a longitudinal axis 40 parallel to the drum mounted spindle 7 can be moved. It has a support arm 8, which is one of the entire device The first working cylinder 9 pressing radially against the drum 1 together with its swivel drive radially to the drum 1 is movable. The support arm 8 contributes Yoke 11, in which a support 13 via guide 12 - in the pressing direction of the pressure roller 15 - is displaceable is stored. The carrier 13 is spatially curved in two planes and carries conical, rotatably mounted fingers 14 and a middle bracket 16 with a pressure roller 15, which is between the fingers protrudes. A second working cylinder 17 is on the one hand on the yoke 11 and on the other hand on the console 16 of the Articulated pressure roller 15. It works approximately in

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Direction of the plane of the pressure roller 15 and at the same time monitors the movement of the carrier 13 in the yoke 11. The direction of rotation of the drum 1 is indicated by the arrow 19, the reference 40 denotes the longitudinal axis of the drum.

As can be seen in particular in FIG. 2, the fingers 14 have a conical shape and extend in different lengths into the free space 23. The pressure roller 15 lies in between and closes with it its front edge 20 with the line formed by the fingertips or is slightly Furthermore. The fingers 14 and the pressure roller 15 are expediently made of a high quality Steel and are provided with an anti-adhesive coating. The pressure roller 15 faces the neighboring fingers inclined at an angle.

3 shows a carrier 13 in which, instead of the two last fingers in the direction of rotation of the drum, one finger individual, conical finger 21 is arranged.

Fig. 4 shows schematically the position of the fingers 14 with respect to the drum circumference. The folding device is located is in the starting position according to FIGS. 1 and 2. To initiate strong expansion forces in the carcass fabric edge 4 to be turned over are the individual fingers 14 in the direction of rotation of the drum (arrow 19) arranged at an increasingly greater distance from the drum longitudinal axis 40 on an arcuate line. So that will achieved that the last finger 14 in the direction of rotation of the drum on the carcass fabric edge 4 has the greatest expansion force

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forces. This avoids that when this point of the carcass fabric edge 4 slips under the first finger.

Fig. 5 shows how this requirement is met on another Vege. In this embodiment are the individual fingers 14 *, 14 "and the conical one Finger 21 mounted on a common arc concentric to the drum circumference. she however, have a stepwise increasing outer diameter in the direction of rotation of the drum, as a result of which the carcass fabric edge is also prevented from slipping underneath. The leading edge 20 of the pressure roller However, 15 does not affect the transfer process.

Fig. 6 shows the position of the pressure roller 15 in relation to the adjacent fingers 14. The pressure roller 15 is carried by a bracket 16 which is attached to the carrier 13 at an angle. She is with one

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Trunnions provided around which the pressure roller 15 is rotatable. The plane of the pressure roller 15 is opposite the adjacent fingers at an angle 18 (about 5 to 15 °, preferably sP to 10 °) so that the front edge 20 of the pressure roller 15 protrudes over the tips of the fingers 14, while your rear Edge recedes behind the fingers 14. The outer edge of the pressure roller 15 is rounded; to this rounding Above the pressure roller 15 is followed by a groove 24 with which in particular the rolling process is improved in the area of the bead.

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In the rolling-on stage shown in FIG. 7a, the carcass fabric edge is turned over largely completed. In this position of the folding device, the pressure roller 15 rests with her Hollow groove 24 on the bead core 5 and presses the carcass fabric edge 4 exactly into the desired contour.

In the illustration shown in FIG. 7b, the folding device is further onto the tire building drum opened and presses the carcass fabric edge 4 with the rounded edge of the pressure roller 15 in a groove immediately behind the bead core 5.

In Fig. 7c, finally, the final phase of rolling is shown, in which the pressure roller 15 the Carcass fabric edge 4 is applied completely. During these three phases of the rolling process, the second working cylinder presses 17 (see Fig. 1 and 2) and its

The first working cylinder supports the pressure roller 15 on the surface of the drum 1.

A control provides that the shifting device at particularly exposed points of the shifting process pauses and the pressure roller 15 thus performs several rolling turns. The contact pressure is preferably on the part of the working cylinder 17 and 9 increased at the same time.

Likewise, the superimposed movements of the swivel drive 6 on the spindle 7 and the support arm 8 are coordinated so that no jerky displacements of the engaged fingers and the pressure roller can occur.

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So that the folding and rolling processes to both Sides of the carcass to be built can run synchronously, there is a turning device on both sides of the drum 1 arranged. These two reversing devices working in mirror image to each other are of the spindle 7, which for this purpose with opposing threaded sections is provided, collapsed. The changing distance between the The pivot point of the swivel drive 6 and the spindle 7 running parallel to the drum axis 40 becomes balanced by the first working cylinder 9.

The exemplary embodiments shown represent only a selection from a large number of possible ones Variants are. Of course, folding devices according to the present invention can also be included be equipped with more than four fingers, which may be additionally adjusted during the folding process, in order to achieve the best possible adaptation to the circumferential speed of the material being processed in every position To reach the carcass fabric edge.

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Claims (20)

METZELER KAUTSCHUK AG Claims Γ 1.) Turning device for a tire building drum, in particular for a full steel carcass building drum, by means of which when the drum is expanded the carcass fabric edges protruding over the bead cores are placed around the bead cores and rolled on are, characterized in that a plurality of conical fingers in each one carrier (13) (14, 21, 14 ') and a plate-shaped pressure roller (15) along a curved line section are rotatably mounted, the axes of rotation of the fingers extending in a common Hit point that the carrier (13) is displaceable and via a swivel drive (6) about a longitudinal axis to the drum vertical axis is pivotably mounted and the pivot drive 6 itself parallel to the drum's longitudinal axis (40) is movable. 2. Folding device according to claim 1, characterized in that the plate-shaped Pressure roller (15) is rotatably mounted on a bracket (16) and the bracket (16) between the fingers (14, 21) is arranged on the carrier (13). ORIGINAL INSPECTED 709849/0289 3. transfer device according to claims 1 and 2, characterized in that; that the plane of the plate-shaped pressure roller (15) opposite the two adjacent fingers (14, 21) is inclined and its circumference - with the fingers perpendicular to the longitudinal axis of the drum - the The tips of the fingers (14) protruded from the front. 4. Folding device according to claims 1 and 3, characterized in that that the plane of the disc-shaped pressure roller (15) between 5 ° and 15 °, preferably between 8 ° and 10 ° against the adjacent finger (14) is arranged inclined, such that at approximately parallel the front edge of the roll lies above the fingertips with the fingers lying to the drum circumference, while the rear edge of the roll and most of the side surface lies meridially below the fingers. 5. Folding device according to claims 1 to 4, characterized in that the fingers (14) in the direction of rotation of the drum (arrow 19) at increasingly larger radial distances from the longitudinal axis of the drum (40) are arranged. 6. Folding device according to claims 1 to 5, characterized in that the fingers (14) are designed with an increasingly larger diameter in the direction of rotation of the drum. 709S49 / 0289 7. Folding device according to claims 1 and 6 _f, characterized in that the last finger in the direction of rotation of the drum (21) has a conical shape. 8. Folding device according to claims 1 to 7, characterized in that that the radius of the arc on which the pivot points of the fingers (14, 21) are arranged, approximately corresponds to the radius of the drum (1). 9. Folding device according to claims 1 to 8, characterized in that that the carrier (13) slidably guided in a yoke (11) and the pressure roller (15) by a working cylinder (17) is applied approximately in the direction of its plane, this working cylinder between Yoke (11) and console (16) is hinged and monitors the movement of the carrier (13) in the yoke (11) . 10. Folding device according to claims 1 and 9, characterized in that that the yoke (11) is arranged displaceably on a support arm (8). 11. Folding device according to claims 1 to 10, characterized in that the edge of the pressure roller (15) is rounded and on the top of the roller against the center of the roller merges into a circumferential groove (24). 709849/0289 12. Folding device according to claims 1 to 11, characterized in that that the fingers (14, 14 ', 21) and the pressure roller (15) are made of high quality steel and over Rolling bearings or needle bearings are stored. 13. Folding device according to claim 1 and 12, characterized in that that the fingers (14, 14 ', 21) and the pressure roller (15) have an anti-adhesive surface coating exhibit. 14. Folding device according to claims 1 to 13, characterized in that that their area of action extends approximately over a quarter of the circumference of the drum (1). 15. Folding device according to claim 1, characterized in that on the pivot drive (6) a first working cylinder (9) with a direction perpendicular to the longitudinal axis (40) of the drum Direction of pressure is hinged, the setting of which is limited by a stop. 16. Folding device according to claims 1 to 15, characterized in that that it executes longitudinal, pivoting, imprinting and pressing movements that overlap and are individually controllable. 709849/0289 17. Folding device according to claims 1 to 16, characterized in that that the working pressures of the working cylinders (17, 9) can be controlled independently of one another. 18. Folding device according to claims 1 to 17, characterized in that that the edge areas of the drum (1) are each assigned a folding device and the two Reversing devices arranged in mirror image to one another on a spindle (7) with counter-rotating Thread sections are movable. 19. Folding device according to claims 1 and 15 to 18, characterized in that that the movements and the working pressures of the working cylinder (9, 17) are variable and via punch cards are controlled. 20. Folding device, in particular according to claim 1, characterized in that the edge areas of the drum (1) with the formation of a free space (23) with respect to the drum circumference are graded. 709S49 / 0289