KR800000868B1 - Tire forming machine - Google Patents

Abstract

A tire forming machine includes a pair of carriages axially movable in unison toward and away from opposite ends of the tire building drum on which bead carriers for supporting tire beades radially outward of the drum ends are mounted. Suitable controls and adjustment are provided for moving the carriages symmetrically about the center line of the drum into precise positions for positioning the tire beads with precisions over the ends of the drum and holding the tire beads in place during expansion of the drum.

Description

Tire molding machine

1 is a side view showing a preferred embodiment of a tire molding machine constructed according to the present invention,

2 is a plan view of the tire forming machine seen from the II-II line of FIG.

3 is an enlarged longitudinal sectional view of a portion of the headstock assembly at the right end of the tire forming machine of FIGS. 1 and 2;

4 is a partially enlarged longitudinal sectional view of the tailstock assembly at the left end of the present tire forming machine,

5 is an enlarged cross-sectional view of the center of the main assembly for the tire forming machine seen from the line V-V of FIG.

FIG. 6 is an enlarged cross sectional view through the carriage inner end abutment of the movable headstock assembly for one of the tire bead conveying devices seen in line VI-VI of FIG.

FIG. 7 is a partial cross sectional view showing a detachable connection between a rack and a carriage of a movable tailstock assembly for another tire bead conveying device as seen from the Ⅶ-Ⅶ line of FIG. 4;

FIG. 8 is a partial cross-sectional view of the head stock assembly of FIG. 3 as seen from the line X-ray of FIG.

9 and 10 are partial longitudinal cross-sectional views showing the preferred process steps of operating a tire molding machine according to the present invention during the manufacture of a tire carcass.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire molding machine, and in particular, in a tire molding machine, the tire bead is accurately positioned above both ends of the tire drum, and at the same time, it is developed to maintain the position of the bead during the expansion of the drum. It is about.

In the manufacture of tires of any kind, a patent has been made, for example on August 19, 1970, after the tire ply is placed on the drum and after the tire beads are positioned in the axial and radial directions above both ends of the tire building drum. As shown in FIGS. 6 and 7 of US Pat. No. 3,721,600, it is common practice to extend the tire ply by radially expanding the drum to engage the inner diameter of the tire bead.

In making an accurate tire, it is important to move both tire beads symmetrically around the centerline of the tire building drum at the correct position above the drum.

In addition, it is also important to seal and fold the same amount of plies on both sides of the tire during accurate tire production.

According to the present invention, the accurate positioning of the tire bead is provided with a conveying apparatus for the tire bead at both ends of the tire forming drum, and the movement of the conveying apparatus is symmetrical around the centerline of the drum. By positioning the tire beads accurately above both ends of the drum to maintain the position of the tire beads during expansion of the drum so that they can be controlled by rack and pinion mechanisms with controls and controls. It is obtained by.

The conveying apparatus may be provided with a pusher ring or the like, which ply-folds the same amount of ply stitching and folding on both sides of the tire, and which helps symmetrical movement of the bladder.

It is known to use racks and pinions to operate the bead conveying device and to move the tire beads to engage the stages of the tire forming drum. The tire beads are accurately positioned axially on the drum stage. It is not a combination of controls and controls necessary to determine and maintain. Accordingly, a main object of the present invention is to provide a tire molding machine in which tire beads are conveyed symmetrically around a drum centerline so as to accurately position tire beads above both ends of the drum, and to maintain position during expansion of the drum. .

Still another object is to provide a tire molding machine in which the movement of the tire bead conveying device is controlled by a rack and pinion mechanism provided with a control device and a control device for accurately positioning and retaining the tire bead above the drum end. have.

Another object is to provide a tire molding machine in which the same amount of ply closure and folding are obtained on both sides of the tire.

These objects of the present invention are achieved by using a rack and pinion mechanism for controlling the movement of the tire bead conveying device in the direction toward both ends of the drum and away from the end.

The tire bead conveying apparatus supports the tire bead on the radially outer side of the drum end, accurately positions the tire bead above both ends of the drum, and simultaneously holds the tire bead at the correct position to hold the tire bead during expansion. Appropriate controls and controls are installed to move the tire bead conveyer symmetrically around the centerline.

In the tire bead conveying apparatus, the same amount of fly sealing and folding are performed on both sides of the tire by simultaneously folding the conveying apparatus at the same distance from the tire and synchronously moving inward toward the bladder. It is also possible to install a pressing ring or the like which folds the ply and moves the bladder symmetrically.

Or more, the objects and advantages of the present invention will be described in detail by the specification and the accompanying drawings.

1 and 2 show a preferred example of a tire molding machine according to the present invention, denoted by reference numeral 1, which is a main body having a drive mechanism and a necessary control device for the desired operation of the apparatus. Housing 3 has a main assembly 2 mounted at one end. A tire shaping drum D is attached to the tire drum shaft S protruding outward in the direction of the outer end 5 of the tire shaping machine into the main housing 3.

The tire forming drum D may be of a conventional collapsible type so that the finished tire carcass can be taken out of it, and in order to seal the tire ply on the drum in a conventional manner, in the direction of approaching and away from each other. A pair of tread stitcher assemblies T are mounted on the conveying device C at the rear of the tire forming machine so as to move in the longitudinal direction.

At each end of the drum D, a ply folding mechanism 6 of the type described in US Pat. No. 3,721,600 is combined, and when collapsed as shown in Figs. 1 and 2, it is held almost flat by an outer shell. With inflatable annular airbags or bladder 7.

On both ends of the tire forming drum D, an inner side and an assembly 10 and 12 having a carriage 14 on which the tire bead conveying device 15 and the bladder pressing ring 16 are positioned are mounted.

Both carriages 14 are mounted to accurately position the tire bead B above both ends of the drum, and move symmetrically around the drum center line so as to be held at that position during expansion of the drum, as described below. In addition, the outer assembly 12, together with the carriage 14 combined therewith, removes the finished tire carcass from this machine and uses the tires on the inner and outer tire bead conveyers for use in making the next tire carcass. It is mounted to move toward or away from an end of the drum proximal portion so that the bead is disposed.

The same parts are denoted by the same reference numerals as long as the structures and operations of the assemblies 10 and 12 on the inside and outside are substantially the same.

As best shown in FIGS. 1, 2 and 4, the outer assembly 12 engages with the outer end of the tire building drum on the movable carriage 14 for the tire lead conveying device 15 and the pressing ring 16. And a second carriage 18 supporting a tailstockslock shaft assembly with a drum flange at the transverse inner end. The drum flange is disposed in the radially inner side of the tire beard conveying apparatus 15, and can be removed and replaced in a normal manner so as to form a tire of a different size desired.

The outer assembly carriages 14 and 18 extend in the longitudinal direction of the master assembly 2 parallel to the axis of the tire building drum D. It has a suitable guide roller 20 to support these carriages to move along a set of guide rails 21. The assembly carriages on both sides toward the stage near the drum D and being pushed from the stage are simultaneously moved by the operation of the hydraulic cylinder 17 (FIG. 4) or properly connected to the carriage 18 to the motor. A rack with engaged pinions may be installed for this purpose.

An adjustable material that engages the fixed stopper 23 on the stem assembly 2 as shown in FIG. 4 to limit the movement of the carriage 18 relative to the tire building drum D in the axial direction and to accurately position the drum flange at the outer end of the drum. The stopper 22 may be installed on the carriage 18.

Tandem cylinders 24 may be provided on the support flanges 25 of the carriage 18, one on each side of the machine so that the carriage 18 and the carriage 14 for the pressing ring 16 are moved further relative to the carriage 18. .

Rod 26 of tandem cylinder 24 provides annular support for tire bead conveyer 15 on the outside such that tire bead conveyer 15 and its associated carriage 14 operate in a direction approaching or away from carriage 18 by operation of the tandem cylinder. It is properly attached to the plate 27 mounted on the outer surface of the ring 28.

The rod 26 is suitably connected to the annular support ring 28 for the inner assembly carriage 14 degree tire bead conveyer 15 and is operated in the vicinity of the tire building drum by operation of a set of contentum cylinders 24 mounted on the main drive housing 3. It is supported on the guide rail 21 on the guide rail by a plurality of support rollers 20 as shown in Fig. 3 so as to move in a direction approaching or away from the end.

The inner diameter of the annular support ring 28 for both tire bead conveying devices 15 moves the tire bead conveying device 15 axially inward from above the via forming drum D end, and precisely in the radial direction from above the drum D end. It is slightly larger than the outer diameter of the tire building drum D when it is in an unexpanded or reduced state as shown in Figs.

The tire bead conveying device 15 is provided with a plurality of jaws 30 circumferentially spaced apart in a circumferential direction. The tire bead B can be attached to the tire bead conveying device 15 by moving and shifting so as to engage and disengage flipper, clamp.

Rack for synchronously moving the inner and outer carriages 14 for the bead ring carrier 15, symmetrically around the center line of the drum D, in order to reliably position the tire bead B exactly above both ends of the drum D. Pinion mechanism 35 is provided.

As indicated in FIG. 5, the rack-pinion mechanism 35 has a rotatable pinion 37 disposed therein and rotatable around the pinion shaft 38 with its axis disposed on the centerline of the carriage 14. It has a housing 36 disposed in between.

On both sides of pinion 37, a set of racks 39 and 40 are engaged. The rack 39 extends axially from one end of the housing 36 to connect to the inner assembly carriage 14, and the rack 40 extends axially outward from the other end of the housing to connect to the outer assembly carriage 14. Therefore, when the hydraulic cylinder 24 is operated, the inner and outer assembly carriages 14 move axially in the direction of approaching or falling apart from each other by the same amount.

Two sets of hydraulic cylinders 24 are shown, one for operating each carriage 14, omitting the hydraulic cylinders for operating the inner assembly carriage, and by operating the hydraulic cylinders for the outer assembly carriage. Corresponding movement of the inner assembly carriage may be caused by rotation of the pinion 37 which moves the rack 39 for the assembly carriage in the same axial direction in the opposite direction as the rack 40 for the inner assembly carriage.

A backup roller 42 mounted in 43 in housing 36 engages the rear of racks 39 and 40 to properly engage racks 39 and 40 with pinion 37, and pinion 37 in the axial direction of carriage 14 It is advisable to install a suitable device 44 which moves the entire housing 36 axially with respect to the guide rail 21 so as to properly align it. As shown in FIG. 5, such a mechanism 44 has a rotatable pin 45 with an eccentric 46 in the vicinity of each side of the housing 36. As shown in FIG.

The eccentric 46 is housed in a bushing 47 supported by a mounting plate 48 extending from both sides of the stem assembly 2 in a slot 49 in the housing 36.

Pin 45 rotates to rotate eccentric 46 and move housing 46 laterally.

Hydraulic cylinder 24 for precisely positioning the tire beads B radially outwardly above both ends of the drum and symmetrically moving each other the carriages 14 around the center line of the drum D to a position where the tire beads are held during expansion of the drum. It is preferable to install a potentiometer type electric fluid pressure control device that controls the operation of the device.

In addition, if the fluid pressure control device does not operate properly, a mechanical stopper 50, inside the assembly carriage, which ensures safe and controlled operation of the machine and restricts the inside movement of the carriage in order to set the bead accurately, Installation on 14 is recommended.

As best shown in FIGS. 3 and 8, this mechanical stopper 50 has an inner end suitably mounted to a plate 27 connected from both sides to an annular ring 28 for the inner assembly carriage 14, with a stop nut 52 at the outer end. It is preferable to have a pair of rods 51 which are attached to each other and extend in the longitudinal direction and are spaced in the transverse direction. The rod 51 extends through the enlarged opening 53 in the stationary support plate 54 on the main housing 3.

It is preferable that the diameter of the opening 53 of the stop mounting plate 54 is slightly larger than the outer diameter of the stop nut 52 so that the carriage 14 can continue to move inward in the axial direction beyond the bead installation position as described below. . However, when the bead is installed, the pair of gates 55 extracted on the rear side of the stop mounting plate 54 swings to the rear position of the enlarged opening 53. When the stop nut 52 engages with the gate 55, the carriage 14 is beaded. Restrict movement in the axial direction to the installation position.

The gate 55 rotates the operating rod 56 extending between its two gates and the rod back and forth to move the rod 55 back and forth around the drilling point, respectively. It is activated by installing an actuating cylinder 57 properly connected to the actuating rod 56.

When the gate 55 is swung as shown by the virtual line in FIG. 8, the carriages 14 are moved axially inward to each other in a large range determined as the safety stopper 58 on the stop rod 51 engages with the stop mounting plate 54. Like the stop nut 52, the safety stopper 58 is also adjustablely attached to the outer end of the stop rod 51, and the safety stopper 58 is preferably formed in the safety stopper so that the outer end of the stop nut 52 extends.

The outer end of the safety stopper 58 is also provided with a groove 60 at the transverse, and a screw 61 is installed to extend the outer end of the safety stopper in the axial direction so that the groove is reduced or expanded to fix or release the safety nut 58 on the stop rod. In order to prevent the drum D from being damaged as the outer assembly reciprocating carriage 14 moves excessively axially inward toward the end of the drum D, the outer assembly carriage 14 of the outer assembly carriage 14 The safety stopper 65 is similarly provided on the stationary rod 66 extending outward from the annular support plate 27.

The stop rod 66 on the outer assembly carriage 14 is mounted on the mounting plate 25 on the shaft assembly carriage 18 with a diameter slightly smaller than the diameter of the safety stopper 65 to restrict the safety stopper 65 from moving axially inwardly beyond the mounting plate 25. The opening is appropriately extended.

The end of rack 39 connected to the inner assembly carriage 14 may be connected by an appropriate method such as pinning the end of the rack 39 to the inner assembly carriage 14 as shown in FIG. However, the connection 70 between the end of the rack 40 and the assembly carriage 14 on the outer side is provided with the tire bead B on the tire bead conveying device 15 and the outer assembly 12 for taking out the finished tire carcass from the tire forming drum D. The outer assembly reciprocating band 14 must be released from the rack 40 before it contracts in the direction axially away from the end closer to drum D.

4 and 7, the release connector 70 between rack 40 and the outer assembly carriage 14 extends between the arms of the yoke 71 to engage the bottom of the reduced end 72 of rack 40. It can also be configured as a yoke 71 for storing the reduced end 72 of the rack 40. The reduced end 72 of the rack 40 has an opening 75 that aligns with the pin 76 on the outer assembled reciprocating band 14 when the end 72 of the rack 40 is properly disposed in the yoke 71.

Plate 76 enters and exits opening 75 of rack 40 to secure or release the carriage to rack 40 by actuation of fluid cylinder 77 to which it is connected.

As mentioned above, although the various parts of the tire molding machine were demonstrated, the typical operation | movement is demonstrated next.

Initially, the tire building drum D is folded, the outer assembly carriage 14 is uncoupled in the combined rack 40, and the drum for placing the tire beads B on the tire bead conveying device 15 of the inner and outer assembly carriages. The outer assembly 12 is moved in a direction axially away from the end of the.

The outer assembly 12 then returns to the position of FIG. 4, the drum flange contacts the end of the drum, and the outer assembly carriage 14 acts to extend the pin 76 into the opening 75 of the rack end 72. It is mounted on the rack 40 again assembled by the operation of the fluid cylinder 77.

Subsequently, while the tire forming drum D is reduced, the annular bladder 7 is ubiquitous and the drum D is rotated so that the stage of the ply is applied to the drum beyond the stage of the ply so as to engage with the bladder 7. After the desired number of tire plies have been wound around the drum D, as shown schematically in FIG. 9, symmetrically around the drum's centerline to position the tire bead B radially and accurately above the drum end. The fluid cylinder 24 that moves the carriage 14 is activated. This movement of the carriage 14 is synchronized by the movement of racks 39 and 40 and pinion 37 as described above.

Thereafter, the segment of the drum is expanded and the tire ply is expanded to engage the inner diameter of the tire bead B as indicated by the phantom line as shown in FIG.

After the drum D is extended to the imaginary line shown in FIG. 9, the jaw 30 for the bead clamp is deflated to release the tire bead B, and then the blade 7 is expanded while the carriage 14 is deflated. The periphery of the tire ply is pressed against the edge of the dredger, which is further extended as shown in FIG.

During expansion of the blade 7, the fluid cylinder 24 is reactivated and the carriage 14 is pressed against the bladder 7 by a pressure ring 16 which acts to press the bladder against the outer surface of the bladder on the outer surface of the drum. Move inward axially.

The movement of the two carriages 14 is symmetrical around the drum centerline and moves the same distance from the tire towards the bladder 7, so that the same amount of fly closure and folding are obtained on both sides of the tire. During the folding of the ply, the gate 55 is retracted such that the carriage 14 moves axially inwardly beyond the bead installation position, the axially inward movement of the safety stopper 58 to prevent damage to the drum as described above. Limited to 65.

When the ply folding is completed, bladder 7 of the type shown in US Pat. No. 3,721,600 is retracted and rewound the bladder to return to a flat state as shown in FIG.

Then, if necessary, a tire ply is added, and materials such as tires, treads, stocks, etc. are applied to the tire carcass, after which the drum is folded and the outer assembly 12 is retracted to complete the take out of the tire carcass completed in this device. The tire bead of the tire bead, which is a preparation for making the tire of the tire, can be mounted on the tire bead conveying device.

As described above, it will be apparent that the tire forming machine of the present description ensures accurate positioning of the tire beads at a desired position above the drum end and holds the position of the tire beads during expansion of the drum.

In addition, the tire forming machine is provided with a mechanism suitable for ensuring that the same amount of sealing and folding of the tire ply is obtained on both sides of the tire, and preventing the tire forming drum from being damaged.

Claims (1)

Having a tire bead conveying device which is mounted to move in a direction approaching or away from both ends of the tire forming drum, and has means for supporting the tire bead on the radially outer side of the drum stage when the drum is reduced. Expandable tire forming drum, an apparatus for expanding and contracting the drum, and the drum to accurately position the tire beads above both ends of the drum while maintaining the position of the wire bead during expansion of the drum. And a device for synchronously moving the tire bead conveying device in the correct position symmetrically around a center line of the tire forming machine.

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