KR20080100387A - Tyre building drum - Google Patents

Abstract

The invention relates to a tyre building drum (3, 4, 5) with folded sections for producing unvulcanized tyre blanks. A plurality of roller arms (2) of the folded sections are coupled to a drive (1, 14) which is disposed at the exterior of the tyre building drum.

Description

Tire manufacturing drum {TYRE BUILDING DRUM}

The present invention relates to a tire building drum having a turn over device for producing a tire blank in an unvulcanized state.

In order to produce a tire blank in an unvulcanized state, a prior art air supply corrugated drum for supplying pressurized air required during turnover operation is used. Drums of this type are relatively expensive and must be replaced within a given circumference. According to document EP-A 1 001 876, which discloses the configuration of the bead turnover device, the required pressure is reached using a plurality of individual levers, which are similarly arranged against the supports of the umbrella. The mechanical device causes an increase in working time in connection with the use of the air drum and is unable to perform a balanced working movement.

An object of the present invention is to configure a tire manufacturing drum of the known art to support a balanced working movement.

According to the present invention for this purpose, the position turnover device comprises a plurality of roller arms, which are connected with a drive device arranged outside of the tire building drum.

By arranging the drive outside the tire building drum, the roller arms can be operated by a so-called pusher, which provides a fully balanced working motion by the roller arms. As a result, tire blanks of very uniform quality can be produced.

In the drawings an embodiment of the invention is schematically illustrated.

1 is a longitudinal cross-sectional view schematically showing a tire manufacturing drum having a mechanical turn over device;

The tire building drum shown in FIG. 1 has drum halves 3, 4 on the left and right sides, which drum halves are supported on the drum shaft 6. Both drum halves 3, 4 together with the drum central part 5 and the integral core stress elements 10 form a cylindrical circular body. On the circular body a single body position 12 is machined and set against the tire blank.

The mechanical bead supports 9 move radially and stabilize the bead area inward with the core stress elements. On the drum shaft 6 with a gap, both drum halves 3, 4 are constrained by a spindle 11 and two screws which are located inside and move left / right. Axial adjustment to the drum halves 3, 4 is carried out by a motor, which rotates the spindle 11 and generates an axial movement.

In the following, a typical operating procedure is described. The core stress elements 10 and the mechanical bead supports on the cylindrical drum halves 3, 4 with the inserted roller arms 2 are transferred to the constituent material for producing the carcus. Next, two cores are set (left / right) on the drum body 13 by a ring-shaped core setting device 1 having a segment structure. The core setting device is a component of the transfer ring having a left side and a right side having a symmetrical structure.

The core setting device 1 is supported on the spindle moving left / right, and the core setting device is precisely programmed controlled by the servomotor and can move in the axial direction. After the core is set, the core setting device 1 on the left and the right side moves outward, and the core setting device is connected to the coupling 14. The core setting and the axial drive segment 1 in the engaged state move inward in the radial direction only in the coupling 14. Thus, a servo control coupling is formed between the core setting device 1 and the roller arms 2.

The distance 13 of the core is reduced through the rotation of the spindle 11 inside the drum shaft. At the same time the bead supports 9 move radially and form a stable device for the next position turnover process. A plurality of roller arms 2 are arranged very narrowly on the left and right drum halves 3, 4 and raise the carcass material arranged relative to the drum halves.

As the core distance is reduced and pressurized air is supplied into the inflated carcass 12 at the same time, the roller arms 2 are guided outwards through axial movement. The rollers of the arms 2 on the left and right sides rotate the carcass material 15 in perfect balance over the formed carcass 12 (tire blank). The roller arms 2 which are guided outwardly have a distance which is enlarged in the roller body region, which is filled by the double roller mechanism 2.1.

Next, horizontal movement is formed during the position turnover process, and air restraint is avoided. After the position turnover is complete another blank element is supplied by the outer part.

The tire manufacturing drum has an outer core setting device that is connected and servo controlled when necessary. Thus, the roller system of both drum halves is guaranteed to be in complete synchronization. At the same time, the synchronization process by the motor does not cause the difficult and unstable control or "stip-slic-effect" of the pneumatic roller lift motion. The operator can also expect that the work-circuit quality / uniformity, in particular shake and side load shake, is clearly improved.

Claims (3)

A tire manufacturing drum having a position turn over device for producing a tire blank in an unvulcanized state, The position turnover device comprises a plurality of roller arms, the roller arms being connected to a drive device arranged outside of the tire building drum. The tire building drum of claim 1, wherein the roller arms are connected to a transfer ring. 3. A tire building drum according to claim 1 or 2, wherein the roller arms are connected to a servo drive.

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