JP2003001723A - Method and device for winding rubber strip material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for winding a rubber strip material which prevents the defective winding of the rubber strip material and a device for the method. SOLUTION: The rubber strip material S is wound onto a molding drum D while being guided by a guide roll 7, a drawing roll 23 is pushed down gradually between the injection nozzle 3 of an injection apparatus 1 and the guide roll 7 while the strip material S is wound to increase the pass of the strip material S, the pushing-down is stopped after the strip material S is cut, and the shrinkage of the strip material (s) is compensated by the increase portion of the pass. As a method for cutting the strip material S, the strip material S is pushed and held by a rod material 15, and strip material S is pulled and cut on the basis of the rotational force of the molding drum D.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for winding a rubber strip material around a molding drum in the production of a pneumatic tire, and more particularly to a rubber strip for preventing a defective winding of the rubber strip material. The present invention relates to a method for winding a material and a winding device.

[0002]

2. Description of the Related Art As a method for manufacturing a pneumatic tire,
Tires such as cap treads, under treads, side treads, and rim cushion rubbers are continuously supplied from an injection device while unvulcanized rubber strip material is wound, and the rubber strip material is wound around a molding drum. Molding of components is under way.

By directly molding the tire constituent member in this way, it is possible to improve the manufacturing efficiency of the tire, and it is not necessary to store the tire constituent member that has been molded in advance, so it is possible to save space. ,as a result,
There is an advantage that the manufacturing cost of the tire can be greatly reduced.

However, if a winding failure occurs on the rubber strip material, it is necessary to stop the winding device to repair the defective portion. Therefore, if such a winding failure frequently occurs, there is a problem that the working efficiency is lowered and the effect of reducing the tire manufacturing cost cannot be obtained.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a winding method and a winding device for a rubber strip material, which makes it possible to prevent defective winding of the rubber strip material.

[0006]

In order to achieve the above object, a method of winding a rubber strip material according to the present invention is such that an unvulcanized rubber strip material is extruded from an injection device and the rubber strip material is wound around a molding drum. In the attaching method, the rubber strip material is wound around a forming drum while being guided by a guide roll, and the rubber strip material is wound between the injection nozzle of the injection device and the guide roll during winding of the rubber strip material. To gradually extend the path of the rubber strip material by gradually pushing down the drawing roll toward the end of the winding of the rubber strip material, the guide roll is separated from the forming drum and between the forming drum and the guide roll. A gap is formed, the rubber strip material is cut in the gap, and after the rubber strip material is cut, the pull-out roll is used. Wherein releasing the depression of the rubber strip material, it is characterized in that to offset the shrinkage of at least the rubber strip material by length increasing fraction of the path.

In order to achieve the above object, the method for winding a rubber strip material of the present invention is a method for winding a rubber strip material around a molding drum while extruding an unvulcanized rubber strip material from an injection device, The rubber strip material is wound around the forming drum while being guided by a guide roll, and at the end of the winding of the rubber strip material, the guide roll is separated from the forming drum to form a gap between the forming drum and the guide roll. The rubber strip material is formed, the rubber strip material is pressed in the gap with a rod material, and the rubber strip material is pulled off based on the rotational force of the molding drum.

On the other hand, the rubber strip material winding device of the present invention for achieving the above object is a device for winding an unvulcanized rubber strip material from an injection device while winding the rubber strip material around a molding drum. Between the injection nozzle of the injection device and the molding drum, a guide roll that is movable along the path of the rubber strip material and guides the rubber strip material to the molding drum, and a path of the rubber strip material. A pulling roll that is movable in a direction intersecting with each other and that controls the length of a path of the rubber strip material is provided, and the rubber strip material is cut in a gap between the molding drum and the guide roll. It is characterized in that a cutting device is provided.

In order to achieve the above object, a rubber strip material winding device of the present invention is an apparatus for winding an unvulcanized rubber strip material from an injection device while winding the rubber strip material around a molding drum. A guide roll that is movable along the path of the rubber strip material and guides the rubber strip material to the molding drum is provided between the injection nozzle of the injection device and the molding drum. The present invention is characterized in that a cutting device made of a bar member is provided which presses the rubber strip material in a gap between the guide roll and assists in cutting the rubber strip material.

The present inventors wind the rubber strip material around the forming drum while guiding it with the guide rolls, and at the end of the winding of the rubber strip material, separate the guide roll from the forming drum to provide a space between the forming drum and the guide roll. The present inventors have earnestly studied a method of forming a gap in the gap and cutting the rubber strip material in the gap and an apparatus for carrying out the method.

As a result, the following problems have been found as a cause of winding failure of the rubber strip material. First
In addition, since a certain amount of tension is applied to the rubber strip material during winding, the rubber strip material itself contracts when the extrusion of the rubber strip material is stopped and the rubber strip material is cut. Therefore, the stress at the time of contraction concentrates on the position near the injection nozzle of the rubber strip material, the rubber strip material is easily cut when the next winding work is started, and the length of the rubber strip material hanging on the guide roll is reduced. However, the tip position of the rubber strip material needs to be adjusted before the next winding work.

Secondly, when a wire cutting device is used for cutting the rubber strip material, when the wire cut into the rubber strip material returns to its original position, the rubber strip material hanging on the guide roll jumps up, The state also requires reworking of the tip position of the rubber strip material. Further, when the rubber strip material is cut and wound up, there is also a disadvantage that the end of the rubber strip material wound around the forming drum goes out of order and the position becomes unstable.

In view of the first problem described above, therefore, during winding of the rubber strip material, the pull-out roll is gradually pushed down toward the rubber strip material between the injection nozzle of the injection device and the guide roll so that The path of the rubber strip material is lengthened, and after the rubber strip material is cut, the pushing down of the rubber strip material by the drawing roll is released, and at least the contraction of the rubber strip material is offset by the increased length of the path. As a result, it is possible to prevent the position of the rubber strip material near the injection nozzle from being easily cut and the length of the rubber strip material applied to the guide roll from decreasing.

On the other hand, in view of the second problem, at the end of the winding of the rubber strip material, the guide roll is separated from the forming drum to form a gap between the forming drum and the guide roll. The rubber strip material is pressed down by the rod material, and the rubber strip material is cut off based on the rotational force of the molding drum. As a result, the rubber strip material hanging on the guide roll is prevented from jumping up, and the position of the end of the rubber strip material wound around the forming drum is stabilized.

[0015]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below in detail with reference to the accompanying drawings.

1 to 3 show a strip material winding apparatus according to an embodiment of the present invention. In the winding device of the present embodiment, the injection device 1 is arranged so as to face the outer peripheral surface of the molding drum D, and the injection device 1 is connected to the molding drum D.
It is configured to reciprocate in the axial direction. The extrusion mechanism of the injection device 1 is not particularly limited,
In order to accurately and quantitatively extrude a tire constituent member for one tire, it is preferable to use a plunger type quantitative extruder.

The injection device 1 has an injection nozzle 3 on the front plate 2 thereof, and the rubber strip material S is continuously extruded from the injection nozzle 3. A pair of left and right arm members 4 and 4 are erected horizontally on the front plate 2 toward the forming drum D. The arm member 4 includes a fixed portion 4a attached to the front plate 2 and the fixed portion 4a.
The movable part 4 that can expand and contract along the path of the strip material S
b), and the expansion / contraction operation thereof is performed by an air cylinder or the like.

A bracket 5 is attached to the side surface of the movable portion 4b of each arm member 4. Then, the guide roll 7 is provided on the tip end side of the arm member 4 via a bearing member 6 which is attached across a pair of left and right brackets 5 and 5.
Is pivotally supported. Locking members 7a are attached to both ends of the rotating shaft of the guide roll 7. Further, although the guide roll 7 is driven by the forming drum D to rotate in one direction, rotation in the opposite direction is restricted. Therefore, the guide roll 7 can apply tension to the rubber strip material S supplied from the injection device 1.

As shown in FIG. 2, when the arm member 4 is extended, the rubber strip material S is pressed against the molding drum D while applying tension by the guide roll 7, and the guide roll 7 and the injection nozzle 3 of the injection device 1 are connected. A space for absorbing the variation in the extrusion amount of the rubber strip material S is formed therebetween. The length of the space is preferably 100 to 200 mm in order to absorb the overshoot at the initial stage of extrusion. On the other hand, as shown in FIG. 3, when the arm member 4 contracts, a gap is formed between the forming drum D and the guide roll 7.

At the tip of the arm member 4, there is provided a cutting device 8 for cutting the rubber strip material S between the molding drum D and the guide roll 7. That is, the bracket 9 is attached to the end surface of the movable portion 4b of each arm member 4, and the rotary actuator 1 is attached to the bracket 9.
0 is installed. The rotary shaft 10 a of the rotary actuator 10 is connected to the rotary shaft 12 a of the swirl vane 12 via a coupling 11. The rotating shaft 12a is supported by a bearing member 13. A bracket 14 is connected to the swirl blade 12. Then, a bar member 15 that straddles the pair of left and right brackets 14 and serves as a cutter
Has been erected. The rod 15 is preferably a round rod having an outer diameter of 3 to 6 mm. The bar 15 is fixed to the bracket 14 so as not to rotate. This cutting device 8 is driven by a rotary actuator 10 to cause the cutting device 8 in FIG.
The bar 15 is rotated along the trajectory X indicated by the broken line.

On the lower side of the guide roll 7, a cylinder 16 provided with a retractable rod 16a is attached to the front plate 2 via a bracket 17. A press roll 19 is rotatably supported at the tip of the rod 16a via a bearing member 18. Locking members 19a are attached to both ends of the rotary shaft of the press roll 19. The press roll 19 constantly presses the rubber strip material S against the molding drum D.

Above the path of the rubber strip material S, a cylinder 20 equipped with a rod 20a that is vertically expandable and contractible.
Is attached to the front plate 2 via the bracket 21. A pull-out roll 23 is rotatably supported by a lower end portion of the rod 20a via a bearing member 22. The pull-out roll 23 pushes the rubber strip material S from above to control the length of the path of the rubber strip material S.

Next, the operation of the above-described rubber strip material winding device will be described. First, the strip material S is extruded from the injection nozzle 3 of the injection device 1 in a predetermined length,
The tip portion is set on the guide roll 7. At this time, the length of the strip material S is such that it can be attached to the forming drum D.

Next, as shown in FIG. 2, the arm member 4 is extended so that the rubber strip material S is pressed against the molding drum D while applying tension by the guide roll 7, and at the same time, the guide roll 7 and the injection device. 1 injection nozzle 3
And a space for absorbing a variation in the extrusion amount of the rubber strip material S are formed between the and. Next, the molding drum D is rotated in accordance with the extrusion of the rubber strip material S, and the guide roll 7 that contacts the molding drum D via the rubber strip material S is driven to rotate. As a result, the rubber strip material S guided by the guide roll 7 is wound around the outer peripheral surface of the molding drum D.

As described above, the rubber strip material S is pressed against the molding drum D while applying tension by using the guide roll 7 to form a space between the guide roll 7 and the injection nozzle 3 of the injection device 1, thereby extruding. Even if the rubber strip material S is unstable in the initial stage or the like, the variation can be absorbed in the space between the guide roll 7 and the injection nozzle 3. That is, since tension is applied to the rubber strip material S, the rubber strip material S does not bend or wavy even if an overshoot occurs. Therefore, in the strip winding molding method using the injection device 1, the rubber strip material S can be accurately wound.

During the winding of the rubber strip material S, the drawing roll 23 is directed toward the rubber strip material S between the injection nozzle 3 of the injection device 1 and the guide roll 7.
Is gradually pushed down at a speed that does not affect the winding work, and the path of the rubber strip material S is increased by that amount (FIG. 4).

Immediately before the winding of the rubber strip material S is completed, the arm member 4 is contracted to separate the guide roll 7 from the forming drum D, and a gap is formed between the forming drum D and the guide roll 7. Formed (FIG. 5).

Then, the rubber strip material S is cut between the forming drum D and the guide roll 7 by using the cutting device 8 equipped with the bar 15. That is, the bar material 15 is swung at a sufficient angle to hold the rubber strip material S between the bar material 15 and the guide roll 7, and the rubber strip material S is cut off based on the rotational force of the molding drum D ( (Figure 6). According to the above-mentioned pulling cut, when the bar 15 returns to its original position,
The rubber strip material S hanging on the guide roll 7 does not jump up, and furthermore, the end of the rubber strip material S wound around the forming drum D does not violate. Further, when the rubber strip material S is cut, the cut end is pressed against the forming drum D by the press roll 19, so that the cut end of the rubber strip material S is reliably prevented from being disturbed. Since the cut end of the rubber strip material S is gradually thinned by pulling, it is possible to minimize the influence of the cut end on the tire uniformity.

After cutting the rubber strip material S, the pull-out roll 23 is raised to release the pushing down of the rubber strip material S by the pull-out roll 23 (FIG. 7). The rubber strip material S contracts, but this contraction is absorbed by the increase in the path of the rubber strip material S (FIG. 8). As a result, it is possible to prevent the position of the rubber strip material S near the injection nozzle from being easily cut, and the cut end of the rubber strip material S can be left on the guide roll 7 with a sufficient length.
Therefore, it is not necessary to manually guide the rubber strip material S onto the guide roll 7 when starting the next winding work, and the winding work can be continuously performed a plurality of times.

In the present invention, the desired cross-sectional shape is formed on the outer peripheral side of the molding drum D by controlling the number of times the rubber strip material S is wound around the molding drum D and the amount of movement of the molding drum D in the axial direction. The tire constituent members can be molded, and these tire constituent members can be accurately molded. Examples of the tire constituent members include cap treads, under treads, side treads, and rim cushion rubbers of pneumatic tires.

[0031]

As described above, according to the present invention, during the winding of the rubber strip material, the pull-out roll is gradually pushed down toward the rubber strip material between the injection nozzle of the injection device and the guide roll. The path of the rubber strip material is increased, and after the rubber strip material is cut, the pushing down of the rubber strip material by the drawing roll is released, and at least the contraction of the rubber strip material is offset by the increase in the path, so the rubber strip material is injected. It is possible to prevent the position near the nozzle from being easily cut and the length of the rubber strip material applied to the guide roll from decreasing.

At the end of winding the rubber strip material,
Separate the guide roll from the forming drum to form a gap between the forming drum and the guide roll, press the rubber strip material with a rod in the gap, and cut the rubber strip material based on the rotating force of the forming drum. Therefore, the rubber strip material hanging on the guide roll can be prevented from jumping up, and the position of the end of the rubber strip material wound around the forming drum can be stabilized.

According to the present invention, the winding failure of the rubber strip material can be prevented as described above, so that the pneumatic tire can be manufactured at a low cost by taking advantage of the strip winding method. .

[Brief description of drawings]

FIG. 1 is an enlarged front view showing a main part of a rubber strip material winding device according to an embodiment of the present invention.

FIG. 2 is a side view showing a device for winding a rubber strip material (a state in which a guide roll is pressed against a molding drum) according to an embodiment of the present invention.

FIG. 3 is a side view showing a device for winding a rubber strip material (a state in which a guide roll is separated from a forming drum) according to an embodiment of the present invention.

FIG. 4 is a schematic side view showing a steady operation state of the rubber strip material winding device.

FIG. 5 is a schematic side view showing a state of preparation for cutting by the winding device for the rubber strip material.

FIG. 6 is a schematic side view showing a cutting operation state of the rubber strip material winding device.

FIG. 7 is a schematic side view showing a state immediately after a cutting operation by the winding device for the rubber strip material.

FIG. 8 is a schematic side view showing a contracted state of the rubber strip material after the cutting operation of the rubber strip material winding device.

[Explanation of symbols]

1 injection device 3 injection nozzles 7 Guide roll 8 cutting device 15 bars 23 Draw-out roll D molding drum S rubber strip material

Continued front page    (72) Inventor Yasuhisa Hasegawa             2-1, Oiwake, Hiratsuka-shi, Kanagawa Yokohama Rubber Co., Ltd.             Ceremony Company Hiratsuka Factory F term (reference) 4F212 AA45 AG14 AH20 VA11 VD03                       VK34 VL01 VL11 VL31

Claims (6)

[Claims] 1. A method of winding an unvulcanized rubber strip material around a molding drum while extruding an unvulcanized rubber strip material from an injection device, wherein the rubber strip material is wound around a molding drum while being guided by a guide roll. During the winding of the strip material, the pull-out roll is gradually pushed down toward the rubber strip material between the injection nozzle of the injection device and the guide roll to increase the path of the rubber strip material. At the end of the winding, the guide roll is separated from the forming drum to form a gap between the forming drum and the guide roll, the rubber strip material is cut in the gap, and the rubber strip material is cut. After that, the pushing down of the rubber strip material by the pull-out roll is released, and at least the front is increased due to the increase in the pass. Winding method of the rubber strip material to offset the contraction of the rubber strip material. 2. A method for winding an unvulcanized rubber strip material around a molding drum while extruding an unvulcanized rubber strip material from an injection device, wherein the rubber strip material is wound around a molding drum while being guided by a guide roll. At the end of winding the strip material, the guide roll is separated from the molding drum to form a gap between the molding drum and the guide roll, and the rubber strip material is pressed with a bar material in the gap to form the molding. A method for winding a rubber strip material, wherein the rubber strip material is drawn and cut based on the rotational force of a drum. 3. At the end of winding the rubber strip material,
The guide roll is separated from the forming drum to form a gap between the forming drum and the guide roll, and the rubber strip material is pressed by a rod member in the gap, and based on the rotational force of the forming drum, The method of winding a rubber strip material according to claim 1, wherein the rubber strip material is cut off. 4. An apparatus for winding an unvulcanized rubber strip material around a molding drum while extruding an unvulcanized rubber strip material from an injection apparatus, comprising: between an injection nozzle of the injection apparatus and the molding drum.
A guide roll that is movable along the path of the rubber strip material and that guides the rubber strip material to the forming drum; and a guide roll that is movable in a direction intersecting the path of the rubber strip material. A winding device for a rubber strip material, which is provided with a drawing roll for controlling a length of a path and a cutting device for cutting the rubber strip material in a gap between the forming drum and the guide roll. 5. A device for winding an unvulcanized rubber strip material around a molding drum while extruding an unvulcanized rubber strip material from an injection device, comprising: between an injection nozzle of the injection device and the molding drum.
A guide roll that is movable along the path of the rubber strip material and guides the rubber strip material to the forming drum is provided, and the rubber strip material is pressed in a gap between the forming drum and the guide roll. A winding device for a rubber strip material, which is provided with a cutting device made of a bar material for assisting the pulling and cutting of the rubber strip material. 6. The cutting device according to claim 4, further comprising a bar-shaped cutting device that presses the rubber strip material in a gap between the forming drum and the guide roll and assists in cutting the rubber strip material. Winding device for rubber strip material.