Raw cover molding apparatus

Abstract

To make a structure of an apparatus used when generating a raw cover a relatively simple structure.SOLUTION: A raw cover molding apparatus 100 comprises a molding drum 51, a winding device 52, a servicer 30, a stopper 14, a first pressing member 15b, and a second pressing member 16b. A front end 5F of a rubber material 5 supplied by the servicer 30 is restricted by the stopper 14. This prevents a position of the front end 5F from being displaced. The front end 5F is pressed against the molding drum 51 by the first pressing member 15b, to prevent the rubber material 5 from peeling off. The second pressing member 16b presses a rear end 5Rr to reduce a gap in a joint portion JT. Therefore, by using the raw cover molding apparatus 100a, the configuration of an apparatus used when generating a raw cover can be a relatively simple configuration.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a raw cover molding device. [Background technology]

[0002] For example, Patent Document 1 discloses a method for manufacturing a tire belt, in which the length of the belt in the longitudinal direction is measured before winding of the sheet-like belt is started, and the pass / fail judgment of the length is performed. Of the belts whose length is measured before winding starts, only those that are judged to be pass are wound onto a winding tube and transported to a forming drum. The belt is wound into a cylindrical shape on the forming drum. Both ends of the belts that are judged to be pass are aligned at the same position on the forming drum. The length of the belt is measured by a displacement sensor that moves with the winding tube while the belt is being transported. Therefore, it is possible to manage the positions of both ends of the belt with a relatively high degree of accuracy. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6993873 Summary of the Invention [Problem to be solved by the invention]

[0004] However, according to the above-mentioned tire belt manufacturing method, for example, it is necessary to simultaneously control the moving speed of the take-up tube and the moving speed of the displacement sensor. Therefore, the structure of the device for manufacturing the belt and its control tend to become complicated. The complicated device leads to increased costs and complicated maintenance.

[0005] The inventors wish to design a device used in producing a raw cover that has a relatively simple structure. [Means for solving the problem]

[0006] The raw cover molding apparatus disclosed herein comprises a cylindrical molding drum, a rotation mechanism for rotating the molding drum, a servicer for supplying rubber material having a length corresponding to the peripheral length of the molding drum toward the outer peripheral surface of the molding drum, a stopper arranged opposite the outer peripheral surface of the molding drum for regulating the front end of the rubber material supplied from the servicer, a first pressing member for pressing the front end of the rubber material against the molding drum, and a second pressing member for pressing the rear end of the rubber material wound around the molding drum against the molding drum. Effect of the Invention

[0007] According to the raw cover molding device disclosed herein, the structure of the device used when producing the raw cover can be made relatively simple. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing the cross-sectional structure of a tire 200. As shown in FIG. [Diagram 2] FIG. 2 is a side view that diagrammatically illustrates the raw cover molding apparatus 100. As shown in FIG. [Diagram 3] FIG. 3 is an enlarged view of the vicinity of the forming drum 51 in FIG. [Figure 4A] FIG. 4A is a diagram illustrating the first lowering process and the supplying process. [Figure 4B] FIG. 4B is a diagram illustrating the front end pressing process. [Figure 4C] FIG. 4C is a diagram showing a schematic diagram of the raising process. [Figure 4D] FIG. 4D is a diagram showing a schematic diagram of the winding process. [Figure 4E] FIG. 4E is a diagram illustrating the second lowering process. [Figure 4F] FIG. 4F is a schematic diagram showing the extrusion process. [Figure 4G] FIG. 4G is a diagram illustrating the joint portion pressing process. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a raw cover molding device according to one embodiment will be described based on the drawings. Note that the present invention is not limited to the following embodiment. Each drawing is drawn diagrammatically and does not necessarily reflect the actual product. Each drawing shows only an example, and does not limit the present invention unless otherwise specified. In addition, the same reference numerals are appropriately assigned to members and parts that perform the same function, and duplicated explanations are omitted.

[0010] <Tire 200> FIG. 1 is a cross-sectional view showing the cross-sectional structure of a tire 200. In FIG. 1, a cross section along the width direction of a tread portion 210 of the tire 200 is shown. The tire 200 is formed by vulcanizing and integrating a low cover, which is an unvulcanized tire in which a plurality of unvulcanized rubber materials are combined, and molding an external shape such as a tread pattern. The low cover is molded by a low cover molding device 100 (see FIG. 2). In FIG. 1, the boundaries of the rubber materials before vulcanization are drawn so that the boundaries of the members constituting the tire 200 in the low cover before vulcanization can be seen. The boundaries of the members constituting the tire 200 in the low cover before vulcanization are integrated after vulcanization. In addition, hatching is omitted in part to make the figure easier to see. Note that FIG. 1 merely illustrates one embodiment of a tire, and the structure of the tire is not limited to the form shown in FIG. 1 unless otherwise specified. In addition, the arrangement of each member and the order of combination may be changed unless otherwise specified.

[0011] In the embodiment shown in FIG. 1, the tire 200 includes, in a low cover state, an inner liner 221, a carcass 222, a cushion rubber 223, a breaker 225, an undertread rubber 226, a tread rubber 227, and a sidewall rubber 228.

[0012] The inner liner 221 is a layer of a rubber sheet disposed inside the tire cord, and is a member for ensuring airtightness of the pneumatic tire. The carcass 222 is a cord layer including a cord. In this embodiment, the carcass 222 is formed of a plurality of layers. The plurality of layers are formed of rubber materials 6a to 6d (see FIG. 2) described later. The inner liner 221 and the carcass 222 are each formed into a cylindrical shape by being wound around a forming drum 51 (see FIG. 3) described later. Beads (not shown) are disposed at both ends in the width direction of the inner liner 221 and the carcass 222. Both ends in the width direction of the inner liner 221 and the carcass 222 are folded back so as to cover the beads. Also, the inner liner 221 and the carcass 222 are formed into a toroidal shape by expanding the center part in the width direction toward the outer diameter side.

[0013] The cushion rubber 223, the breaker 225, the undertread rubber 226, the tread rubber 227, and the sidewall rubber 228 are wound around predetermined positions of the inner liner 221 and the carcass 222, which are formed into a toroidal shape. Then, the shape of the joints of the rubber material, etc., is adjusted, and a raw cover, which is an unvulcanized tire, is produced.

[0014] Here, the tread rubber 227 is a rubber material that constitutes the tread portion 210 that is the part that comes into contact with the ground during running. The tread rubber 227 is a rubber layer that is attached to the outer peripheral surface of the row cover, and has a required thickness. The breaker 225 is an arranged cord layer.

[0015] The breaker 225 absorbs shocks from the road surface and prevents external damage to the tread rubber 227 from reaching the carcass 222 directly, and also prevents the tread rubber 227 and the carcass 222 from peeling off from each other.

[0016] The cushion rubber 223 is disposed between the breaker 225 and the carcass 222 at the edge portion of the breaker 225. The cushion rubber 223 acts as a buffer material that reduces the force that the edge portion of the breaker 225 receives from acting on the carcass 222.

[0017] The undertread rubber 226 is disposed between the tread rubber 227 and the breaker 225. In this embodiment, the undertread rubber 226 is provided particularly so as to cover the edge portion of the breaker 225, and acts as a buffer material that reduces the force that the edge portion of the breaker 225 receives from acting on the tread rubber 227.

[0018] <Low cover molding device 100> FIG. 2 is a side view showing the low cover molding apparatus 100. The low cover molding apparatus 100 is an apparatus for molding a low cover. FIG. 2 shows, for example, a schematic diagram of a portion of the apparatus for molding a low cover where an inner liner 221 (see FIG. 1) and a carcass 222 (see FIG. 1) are assembled. FIG. 3 is an enlarged view of the vicinity of the molding drum 51 in FIG. 2. The low cover molding apparatus 100 may include an apparatus for kneading rubber material and an apparatus for assembling tire parts such as sidewall parts, tread parts, and shoulder parts, but a description thereof will be omitted here.

[0019] In the embodiment shown in FIG. 2, the rubber material 5 is prepared in a state of being wound around the reel 110. The rubber material 5 is a member that constitutes the inner liner 221. In addition, the rubber materials 6a to 6d are prepared in a state of being wound around the reels 111 to 114. The rubber materials 6a to 6d are members that constitute the carcass 222. The number of rubber materials that constitute the carcass 222 is not particularly limited. In the following description, the rubber material 5 is used as the member that is wound around the molding drum 51, but the same applies to the rubber materials 6a to 6d. The same can be applied to the case of forming parts other than the inner liner 221 and the carcass 222 of the tire 200 shown in FIG. 1.

[0020] 2 and 3, the downstream side in the conveying direction in which the rubber material 5 is conveyed is represented as the front. The directions of front, rear, left, right, up, and down are represented by arrows F, Rr, L, R, U, and D in the figures, respectively. However, these directions are merely for convenience of explanation and do not limit the installation direction of the raw cover molding device 100. For convenience, the forward direction, which is the conveying direction of the rubber material 5, is represented as one direction, but the conveying direction of the rubber material 5 may change midway.

[0021] <Low cover molding device 100> As shown in FIGS. 2 and 3, the raw cover forming apparatus 100 includes a servicer 30, a cutting device 40, an applicator 70, a forming drum 51, a winding device 10, a pressing roller 60, and a control device 90.

[0022] <Servicer 30> The servicer 30 is a device that supplies the rubber material 5 and the rubber materials 6a to 6d toward the outer circumferential surface of the forming drum 51. As shown in FIG. 3, the servicer 30 includes, for example, a plurality of rollers 32 arranged along a predetermined transport path leading to the forming drum 51, and an endless belt 31 is wound around the rollers 32. At least one of the plurality of rollers 32 is a drive roller. A drive motor 33 is connected to the drive roller. When the drive roller is rotated by the drive motor 33, the endless belt 31 runs.

[0023] <Cutting device 40> As shown in FIG. 2, the cutting device 40 is a device that cuts the rubber material 5 and the rubber materials 6a to 6d sent out from the reels 110 to 114 to a predetermined length. The cutting device 40 includes, for example, a cutter and a cutter operating device (not shown). The cutter is operated by the cutter operating device. In this embodiment, the rubber material is cut to a length corresponding to the outer circumferential length of the forming drum 51. The length corresponding to the outer circumferential length of the forming drum 51 is a predetermined length for one tire.

[0024] <Applicator 70> As shown in Fig. 3, the applicator 70 is a device that supplies the rubber material 5 and the rubber materials 6a to 6d (see Fig. 2) transported by the servicer 30 to the molding drum 51. The configuration of the applicator 70 is not particularly limited, but is, for example, a device having a belt for transporting the rubber material 5. In addition, the applicator 70 may be configured to be movable toward the direction of the rotation center axis CL of the molding drum 51 described later.

[0025] <Forming drum 51> The forming drum 51 is a cylindrical member disposed downstream of the servicer 30. The forming drum 51 is configured to be rotatable around a rotation center axis CL. The forming drum 51 includes a plurality of segments 51a. Each segment 51a is attached so as to be capable of contracting and expanding in the circumferential direction of the forming drum 51. In this embodiment, a winding device 52 for rotating the forming drum 51 is provided on the rotation center axis CL of the forming drum 51. The winding device 52 is an example of a rotation mechanism in the present invention. In this embodiment, the winding device 52 is configured so that when the rubber material 5 or the rubber materials 6a to 6d (see FIG. 2) are wound around the forming drum 51, the forming drum 51 rotates from the rear to the front as viewed from above the forming drum 51. The winding device 52 is configured, for example, by an electric motor. The rotation center axis CL is configured, for example, by a rotation shaft of the electric motor.

[0026] In the raw cover molding device 100 shown in FIG. 2, the rubber material 5 and the rubber materials 6a to 6d are respectively fed from the reels 110 to 114. The rubber material 5 and the rubber materials 6a to 6d fed from the reels 110 to 114 are cut to a predetermined length by the cutting device 40. The front end of the transported rubber material 5 is referred to as the front end 5F, and the rear end is referred to as the rear end 5Rr. The rubber material 5 and the rubber materials 6a to 6d cut to a predetermined length by the cutting device 40 are transported one by one in order through the servicer 30 toward the molding drum 51, and are wound around the molding drum 51 in order. The rubber materials 6a to 6d are transported in the order of the rubber material 6a, the rubber material 6b, the rubber material 6c, and the rubber material 6d.

[0027] 3 shows a state in which the rubber material 5 sent out from the reel 110 in FIG. 2 is wound around the molding drum 51. However, the same applies when the rubber materials 6a to 6d are wound around the molding drum 51.

[0028] Next, a description will be given of the winding device 10. As shown in Fig. 3, the winding device 10 includes a lifting mechanism 11, a mounting table 12, an arm 13, a stopper 14, a first pressing mechanism 15, a second pressing mechanism 16, and a push-out mechanism 17.

[0029] <Lifting mechanism 11> The lifting mechanism 11 is disposed on the upper surface of the mounting table 12. The lifting mechanism 11 is a mechanism for moving the stopper 14 in the vertical direction along the radial direction of the forming drum 51. In this embodiment, the lifting mechanism 11 lifts and lowers the stopper 14 directly above the rotation center axis CL of the forming drum 51. The lifting mechanism 11 lifts and lowers the stopper 14 by lifting and lowering the arm 13. In addition, by lifting and lowering the arm 13, the first pressing mechanism 15 and the second pressing mechanism 16 are also lifted and lowered. The lifting mechanism 11 includes a main body 11a, a cylinder 11b, and a top plate 11c. The cylinder 11b is disposed between the main body 11a and the top plate 11c. When the rod 11ba is extended by driving the cylinder 11b, the top plate 11c rises relative to the main body 11a. In addition, when the rod 11ba is contracted, the top plate 11c descends relative to the main body 11a. In this embodiment, three cylinders 11b are connected to the main body 11a, but the number of cylinders 11b is not particularly limited.

[0030] <Placement table 12> The mounting table 12 is a table on which the lifting mechanism 11 is placed. The mounting table 12 is disposed in front of the push-out mechanism 17. In this embodiment, the mounting table 12 has a portion extending in the front-rear direction and a portion extending in the up-down direction, and has an L-shape. The mounting table 12 is configured to be movable in the front-rear direction. Although detailed illustration is omitted, the mounting table 12 has, for example, an engaged member that engages with the push-out mechanism 17, and is configured to be engaged with the push-out mechanism 17. When the mounting table 12 is moved in the front-rear direction with the engaged member engaged with the push-out mechanism 17, the winding device 10 moves in the front-rear direction.

[0031] <Arm 13> The arm 13 is attached to the upper surface of the top plate 11c of the lifting mechanism 11. The arm 13 includes a first horizontal portion 13a, a vertical portion 13b extending vertically from the front end of the first horizontal portion 13a, and a second horizontal portion 13c extending forward from the lower end of the vertical portion 13b. The first horizontal portion 13a of the arm 13 is attached to the upper surface of the top plate 11c. A stopper 14, a first pressing mechanism 15, and a second pressing mechanism 16 are attached to the second horizontal portion 13c of the arm 13. The second horizontal portion 13c is disposed below the first horizontal portion 13a and above the forming drum 51.

[0032] <Stopper 14> The stopper 14 is disposed so as to face the outer peripheral surface of the forming drum 51. The stopper 14 is a member that regulates the front end 5F of the rubber material 5 supplied from the servicer 30. In this embodiment, the stopper 14 is attached to the second horizontal portion 13c of the arm 13. The shape of the stopper 14 is not particularly limited, but is, for example, a plate-like shape extending in the direction of the rotation center axis CL of the forming drum 51. The material of the stopper 14 is also not particularly limited. The stopper 14 is raised and lowered by the lifting mechanism 11. The stopper 14 is configured to move between a first position P1 and a second position P2 (see FIG. 4A). The first position P1 is a position where the front end 5F of the rubber material 5 does not contact the stopper 14 when the rubber material 5 is supplied from the servicer 30 to the forming drum 51. That is, the first position P1 is located above the transported rubber material 5. The second position P2 is a position where the rubber material 5 comes into contact with the stopper 14 when the rubber material 5 is supplied from the servicer 30 to the molding drum 51. In this embodiment, the second position P2 is set so that at least a portion of the stopper 14 arranged at the second position P2 overlaps in the vertical direction with the rubber material 5 when it is transported by the servicer 30.

[0033] <First holding mechanism 15> The first pressing mechanism 15 is attached to the arm 13 behind the stopper 14. The first pressing mechanism 15 is a mechanism for pressing the rubber material 5. The first pressing mechanism 15 includes a cylinder 15a and a first pressing member 15b. The cylinder 15a is attached to the arm 13. The first pressing member 15b is attached to the tip of the rod 15c of the cylinder 15a. By driving the cylinder 15a, the rod 15c expands and contracts. The first pressing member 15b is a member for pressing the front end 5F of the rubber material 5 against the molding drum 51. Since the first pressing mechanism 15 is attached to the rear of the stopper 14, the first pressing member 15b is disposed on the side where the servicer 30 supplies the rubber material 5 with respect to the stopper 14. By expanding and contracting the rod 15c of the cylinder 15a, the first pressing member 15b rises and falls. When the rod 15c of the cylinder 15a extends and the first pressing member 15b descends, the first pressing member 15b presses the rubber material 5 against the molding drum 51. The shape of the first pressing member 15b is not particularly limited, but for example, it is a member having a rectangular shape in a plan view. The material of the first pressing member 15b is not particularly limited, but for example, it is formed from a resin composition.

[0034] <Second holding mechanism 16> The second pressing mechanism 16 is attached to the arm 13 in front of the stopper 14. The second pressing mechanism 16 is a mechanism for pressing the rubber material 5. The second pressing mechanism 16 includes a cylinder 16a and a second pressing member 16b, similar to the first pressing mechanism 15. The cylinder 16a is attached to the arm 13. The first pressing member 16b is attached to the tip of the rod 16c of the cylinder 16a. By driving the cylinder 16a, the rod 16c expands and contracts. The second pressing member 16b is attached to the lower end of the cylinder 16a. The second pressing member 16b is a member for pressing the rear end 5Rr of the rubber material 5 wound around the forming drum 51 against the forming drum 51. Since the second pressing mechanism 16 is attached to the front of the stopper 14, the second pressing member 16b is disposed on the opposite side of the servicer 30 with respect to the stopper 14. By expanding and contracting the rod 16c of the cylinder 16a, the second pressing member 16b rises and falls. When the rod 16c of the cylinder 16a extends and the second pressing member 16b descends, the second pressing member 16b presses the rubber material 5 against the molding drum 51. The shape of the second pressing member 16b is not particularly limited, but for example, it is a member having a rectangular shape in a plan view. The material of the second pressing member 16b is not particularly limited, but for example, it is formed from a resin composition.

[0035] <Extrusion mechanism 17> The extrusion mechanism 17 is disposed behind the mounting table 12. The extrusion mechanism 17 is a mechanism that moves the stopper 14 in the front-rear direction along the outer circumferential surface of the molding drum 51, and extrudes the rear end 5Rr of the rubber material 5 by the stopper 14. In this embodiment, the stopper 14 moves in the front-rear direction at a position directly above the rotation center axis CL on the outer circumferential surface of the molding drum 51. In this embodiment, the extrusion mechanism 17 includes a cylinder 17a and an extrusion member 17b. By driving the cylinder 17a, the rod 17aa included in the cylinder 17a expands and contracts in the front-rear direction. The extrusion member 17b is attached to the front end of the rod 17aa. As described above, the extrusion mechanism 17 and the mounting table 12 are configured to be engageable with each other. With the extrusion mechanism 17 and the mounting table 12 engaged, the rod 17aa expands and contracts in the front-rear direction, causing the mounting table 12 to move in the front-rear direction. By the mounting table 12 moving in the front-rear direction, the arm 13 and the stopper 14 attached to the arm 13 move in the front-rear direction.

[0036] Here, the lifting mechanism 11, the first pressing mechanism 15, the second pressing mechanism 16, and the pushing mechanism 17 use cylinders 11b, 15a, 16a, and 17a as actuators, respectively. The cylinders 11b, 15a, 16a, and 17a are each a linear motion mechanism, and can be realized, for example, by a double acting single rod cylinder. The type of cylinder used is not particularly limited. The cylinders 11b, 15a, 16a, and 17a can be appropriately configured, for example, by an air cylinder, an electric cylinder, a hydraulic cylinder, or the like.

[0037] <Press roller 60> The pressing roller 60 is disposed above the forming drum 51. The pressing roller 60 includes a moving device 61 and a roller unit 62. The roller unit 62 is an example of a roller in the present invention. The moving device 61 is configured to be movable so that the roller unit 62 approaches and moves away from the forming drum 51. Therefore, the roller unit 62 is configured to be able to approach and move away from the forming drum 51. The moving device 61 may include, for example, a cylinder such as an air cylinder. The roller unit 62 is disposed so that the axial direction is aligned with that of the forming drum 51. The roller unit 62 is a roller that presses the rubber material 5 wound around the forming drum 51. The roller unit 62 may be, for example, a cylindrical roller or a brush roller.

[0038] <Control device 90> The control device 90 is a device that performs various processes of the raw cover molding device 100. The control device 90 is electrically connected to the servicer 30, the lifting mechanism 11, the first pressing mechanism 15, the second pressing mechanism 16, the extrusion mechanism 17, and the pressing roller 60, and controls them. The control device 90 can be embodied by a computer that operates according to a predetermined program. Specifically, each function of the control device 90 is processed by an arithmetic unit (also called a processor, a CPU (Central Processing Unit), or an MPU (Micro-processing unit)) and a storage device (such as a memory or a hard disk) of each computer that constitutes the control device 90. For example, each configuration of the control device 90 can be embodied as a database that stores data embodied by a computer in a predetermined format, a data structure, a processing module that performs a predetermined arithmetic process according to a predetermined program, or as a part of them. Although not shown in the figure, the control device 90 may be one in which multiple control devices work together. For example, when the control device 90 of the winding device 10 is connected to an external computer via a LAN cable, the Internet, or the like so as to be able to perform data communications with the external computer, the processing of the control device 90 may be performed in cooperation with such an external computer. For example, the information or a part of the information stored in the control device 90 may be stored by the external computer, and the processing or a part of the processing executed by the control device 90 may be executed by the external computer.

[0039] In this embodiment, the control device 90 is configured to execute a first lowering process, a supplying process, a front end pressing process, a rising process, a winding process, a second lowering process, an extrusion process, and a joint portion pressing process. The control device 90 is configured to execute each process in the above order. Each process executed by the control device 90 will be described below. Also, Figs. 4A to 4G are side views of the vicinity of the forming drum 51 of the raw cover forming device 100. Figs. 4A to 4G show the state of the winding device 10 when executing each of the above processes. Fig. 4A is a diagram showing the first lowering process and the supplying process. Fig. 4B is a diagram showing the front end pressing process. Fig. 4C is a diagram showing the rising process. Fig. 4D is a diagram showing the winding process. Fig. 4E is a diagram showing the second lowering process. Fig. 4F is a diagram showing the extrusion process. Fig. 4G is a diagram showing the joint portion pressing process.

[0040] <First drop process> The first lowering process is a process of moving the stopper 14 from the first position P1 to the second position P2. FIG. 4A shows the first lowering process in a schematic manner. Before the first lowering process is performed, as shown in FIG. 3, the stopper 14 is disposed at the first position P1. At this time, the rubber material 5 is not wound around the forming drum 51. The rubber material 5 is disposed on the endless belt 31 of the servicer 30. In the first lowering process, as shown in FIG. 4A, the control device 90 lowers the arm 13 and the stopper 14 attached to the arm 13 by contracting the rod 11ba of the cylinder 11b of the lifting mechanism 11. The stopper 14 is lowered to the second position P2. The lowering to the second position P2 may be performed automatically by the control device 90, or may be stopped at the second position P2 by an operator.

[0041] <Supply Processing> The supply process is a process in which the servicer 30 supplies the rubber material 5 until the rubber material 5 comes into contact with the stopper 14. When the stopper 14 is disposed at the second position P2, the control device 90 drives the drive motor 33 (see FIG. 3) to rotate the roller 32 of the servicer 30, thereby running the endless belt 31. At this time, the rubber material 5 disposed on the endless belt 31 passes over the applicator 70 and is supplied to the molding drum 51. At this time, as shown in FIG. 4A, the front end 5F of the rubber material 5 supplied to the molding drum 51 comes into contact with the stopper 14 disposed at the second position P2.

[0042] <Front end pressing process> The front end pressing process is a process in which the rubber material 5 is pressed against the molding drum 51 by the first pressing member 15b after the rubber material 5 comes into contact with the stopper 14. FIG. 4B shows the front end pressing process. In the front end pressing process, as shown in FIG. 4B, the control device 90 extends the rod 15c of the cylinder 15a of the first pressing mechanism 15 to lower the first pressing member 15b. At this time, the front end 5F of the rubber material 5 is pressed against the molding drum 51 by the first pressing member 15b. After the front end 5F of the rubber material 5 is sufficiently pressed against the molding drum 51 by the first pressing member 15b, the control device 90 may raise the first pressing member 15b and separate the first pressing member 15b from the front end 5F of the rubber material 5. The first pressing member 15b may be separated from the rubber material 5 by the next raising process. The operation of contracting the rod 15c to raise the first holding member 15b may be performed, for example, before the second lowering process described later.

[0043] <Rising process> The raising process is a process of moving the stopper 14 to the first position P1. FIG. 4C shows the raising process in a schematic manner. In the raising process, as shown in FIG. 4C, the control device 90 raises the arm 13 and the stopper 14 attached to the arm 13 by extending the rod 11ba of the cylinder 11b of the lifting mechanism 11. The front end 5F of the rubber material 5 is pressed against the forming drum 51 by the first pressing member 15b as shown in FIG. 4B. Thereafter, as shown in FIG. 4C, the stopper 14 rises to the first position P1. The rise to the first position P1 may be automatically performed by the control device 90, or may be stopped at the first position P1 by an operator. At this time, the stopper 14 may rise to a position that does not interfere with the process of winding the rubber material 5 around the forming drum 51.

[0044] <Wrapping process> The winding process is a process of winding the rubber material 5 around the molding drum 51. FIG. 4D shows the winding process in a schematic manner. In the winding process, as shown in FIG. 4D, the control device 90 drives the winding device 52 (see FIG. 3) connected to the molding drum 51, and rotates the molding drum 51 from rear to front as viewed from above the molding drum 51. As a result, the rubber material 5 is wound around the outer circumferential surface of the molding drum 51. In this embodiment, when the rubber material 5 is wound around the molding drum 51, the rubber material 5 is pressed by the pressing roller 60. The control device 90 may drive the moving device 61 before the rotation of the molding drum 51 to bring the roller portion 62 closer to the molding drum 51. At this time, the gap between the roller portion 62 and the molding drum 51 in the radial direction of the molding drum 51 is controlled to be slightly narrower than the thickness of the rubber material 5. As the forming drum 51 rotates, the rubber material 5 passes through the gap between the roller portion 62 and the forming drum 51 while being compressed in the radial direction of the forming drum 51, and is wound around the forming drum 51. The rubber material 5 is pre-cut to a length such that the front end 5F and the rear end 5Rr slightly overlap when the rubber material 5 is wound around the forming drum 51 once. This overlapping portion is called a joint portion JT. When the rubber material 5 is wound around the forming drum 51, the pressing roller 60 moves away from the forming drum 51.

[0045] <Second descent process> The second lowering process is a process in which the stopper 14 is lowered to the second position P2 after the rubber material 5 is wound around the forming drum 51. FIG. 4E shows the second lowering process in a schematic manner. In the second lowering process, as shown in FIG. 4E, the rear end 5Rr of the rubber material 5 at the joint JT (see FIG. 4D) may be disposed forward of the stopper 14. After the rubber material 5 is wound around the forming drum 51, the control device 90 contracts the rod 11ba of the cylinder 11b of the lifting mechanism 11 to lower the arm 13 and the stopper 14 attached to the arm 13. The stopper 14 is lowered to a predetermined second position P2. The second position P2 may be adjusted to a height at which the rear end 5Rr of the rubber material 5 overlapping the front end 5F of the rubber material 5 can come into contact with the stopper 14 at the joint JT.

[0046] Incidentally, before the stopper 14 is lowered, the rear end 5Rr of the rubber material 5 may be located directly below the stopper 14 or behind the stopper 14. In this case, the mounting table 12 may be moved rearward by contracting the rod 17aa (see FIG. 3) of the cylinder 17a of the extrusion mechanism 17, thereby moving the stopper 14 rearward. Alternatively, the molding drum 51 may be rotated until the rear end 5Rr of the rubber material 5 is located forward of the stopper 14 or in a position in contact with the front surface of the stopper 14.

[0047] <Extrusion processing> The extrusion process is a process of driving the extrusion mechanism 17 and moving the stopper 14. FIG. 4F shows the extrusion process in a schematic manner. In the extrusion process, as shown in FIG. 4F, the control device 90 extends the rod 17aa of the cylinder 17a of the extrusion mechanism 17 and moves the extrusion member 17b forward. This causes the mounting table 12 to move forward. As the mounting table 12 moves forward, the stopper 14 moves forward, and the rear end 5Rr of the rubber material 5 is pushed forward by the stopper 14. This reduces the joint amount of the joint part JT. The control device 90 may move the stopper 14 until the joint amount of the joint part JT becomes a desired amount. The amount by which the stopper 14 moves is about 5 mm at maximum. The movement of the stopper 14 may be automatically performed by the control device 90, or may be stopped by an operator.

[0048] <Joint pressing process> The joint pressing process is a process in which the rubber material 5 is pressed against the molding drum 51 by the second pressing member 16b. FIG. 4G shows the joint pressing process in a schematic manner. In the joint pressing process, as shown in FIG. 4G, the control device 90 extends the rod 16c of the cylinder 16a of the second pressing mechanism 16 and lowers the second pressing member 16b. As a result, the joint JT of the rubber material 5 is pressed against the molding drum 51 by the second pressing member 16b. After the second pressing member 16b presses the rubber material 5, the control device 90 controls the cylinder 16a to raise the second pressing member 16b. As a result, the front end 5F and the rear end 5Rr of the rubber material 5 are more appropriately overlapped at the joint JT, and the gap that may occur between the rubber material 5 and the molding drum 51 can be reduced.

[0049] As described above, the raw cover forming device 100 includes a cylindrical forming drum 51, a winding device 52 that rotates the forming drum 51, a servicer 30, a stopper 14, a first pressing member 15b, and a second pressing member 16b. Here, the servicer 30 is a device that supplies a rubber material 5 having a length corresponding to the outer circumferential length of the forming drum 51 toward the outer circumferential surface of the forming drum 51 (see FIG. 3). The stopper 14 is disposed so as to face the outer circumferential surface of the forming drum 51, and is a member that regulates the front end 5F of the rubber material 5 supplied from the servicer 30 (see FIG. 4A). The first pressing member 15b is a member that presses the front end 5F of the rubber material 5 supplied by the servicer 30 against the forming drum 51 (see FIG. 4B). The second pressing member 16b is a member that presses the rear end 5Rr of the rubber material 5 wound around the forming drum 51 against the forming drum 51 (see FIG. 4G).

[0050] According to the raw cover molding device 100, the molding drum 51 is rotated by the winding device 52, and the rubber material 5 is wound around the molding drum 51. The rubber material 5 is supplied to the molding drum 51 by the servicer 30. The front end 5F of the rubber material 5 supplied from the servicer 30 is regulated by the stopper 14. The first pressing member 15b presses the front end 5F of the rubber material 5 against the molding drum 51. By pressing the front end 5F against the molding drum 51, the rubber material 5 is prevented from peeling off from the molding drum 51 when the rubber material 5 is wound around the molding drum 51. The second pressing member 16b presses the rear end 5Rr of the rubber material against the molding drum 51. This prevents the rubber material 5 from floating up at the joint part JT due to the front end 5F and the rear end 5Rr overlapping each other. The raw cover molding device 100 does not include, for example, a sensor that measures the displacement of the rotation of the molding drum 51. In this way, the raw cover molding device 100 has a relatively simple structure while managing the winding of the rubber material 5 as in the conventional technology. By using the raw cover molding device 100, the structure of the device used when producing the raw cover can be made relatively simple.

[0051] In the above-described embodiment, as shown in FIG. 4A, the first pressing member 15b is disposed on the side of the stopper 14 where the rubber material 5 is supplied by the servicer 30, rather than the stopper 14. The second pressing member 16b is disposed on the opposite side of the stopper 14 from the servicer 30. As shown in FIG. 4B, the first pressing member 15b presses the front end 5F of the rubber material 5. As shown in FIG. 4G, the second pressing member 16b presses the rear end 5Rr of the rubber material 5. As in this embodiment, by disposing the first pressing member 15b and the second pressing member 16b, the front end 5F and the rear end 5Rr can be pressed without moving the winding device 10 in the front-rear direction. Therefore, the winding device 10 can be configured to have a simpler structure.

[0052] In the above-described embodiment, the low cover molding device 100 includes a lifting mechanism 11 that lifts and lowers the stopper 14 directly above the rotation center axis CL of the molding drum 51. When the rubber material 5 is wound around the molding drum 51, the stopper 14 is disposed at the first position P1, thereby preventing the stopper 14 from interfering with the winding of the rubber material 5. In addition, the low cover molding device 100 includes an extrusion mechanism 17 that extrudes the rear end 5Rr of the rubber material 5 by the stopper 14, as shown in FIG. 4F. This allows the position of the rear end 5Rr to be adjusted when the second pressing member 16b presses the rear end 5Rr. Therefore, the joint amount of the joint portion JT can be managed.

[0053] In the above-described embodiment, the raw cover molding device 100 includes a pressing roller 60. The pressing roller 60 is configured to be capable of moving toward and away from the molding drum 51. When the rubber material 5 is wound around the molding drum 51, as shown in FIG. 4D, the rubber material 5 can be pressed against the molding drum 51 by the roller portion 62 of the pressing roller 60. This prevents the rubber material 5 from peeling off from the molding drum 51 when the rubber material 5 is wound around the molding drum 51. Therefore, the winding of the rubber material 5 can be managed with higher accuracy.

[0054] In the above-described embodiment, the lifting mechanism 11 is configured to move the stopper 14 between the first position P1 and the second position P2. As shown in FIG. 3, the first position P1 is a position where the front end 5F of the rubber material 5 does not contact the molding drum 51 when the rubber material 5 is supplied from the servicer 30 to the molding drum 51. As shown in FIG. 4A, the second position P2 is a position where the front end 5F of the rubber material 5 contacts the molding drum 51 when the rubber material 5 is supplied from the servicer 30 to the molding drum 51. By supplying the rubber material 5 when the stopper 14 is disposed at the second position P2, the front end 5F of the rubber material 5 can be disposed at the position of the stopper 14. That is, the position of the front end 5F of the rubber material 5 is prevented from shifting with respect to the molding drum 51 every time the rubber material 5 is supplied. Therefore, the winding of the rubber material 5 can be managed with higher accuracy.

[0055] In the above-described embodiment, the control device 90 is provided to control the servicer 30, the lifting mechanism 11, and the extrusion mechanism 17. The control device 90 is configured to execute a first lowering process, a supplying process, and an ascending process. As a result, as shown in FIG. 4A, when the rubber material 5 is conveyed, the front-rear position of the front end 5F of the rubber material 5 can be aligned with the front-rear position of the stopper 14. Furthermore, as shown in FIG. 4C, the stopper 14 rises from the second position P2 to the first position P1, so that the aligned rubber material 5 can be wound around the molding drum 51 as it is.

[0056] In the above-described embodiment, the control device 90 is configured to execute the front end pressing process after the supply process. This makes it possible to reliably press the front end 5F of the rubber material 5 against the molding drum 51, as shown in Fig. 4B. This makes it possible to prevent the rubber material 5 from peeling off from the outer circumferential surface of the molding drum 51 when the rubber material 5 is wound around the molding drum 51.

[0057] In the above-described embodiment, the control device 90 is configured to further execute the winding process, the second lowering process, and the joint portion pressing process. As a result, as shown in FIG. 4G, the joint portion JT of the rubber material 5 wound around the molding drum 51 can be pressed against the molding drum 51 by the second pressing member 16b. Here, since the front end 5F and the rear end 5Rr of the rubber material 5 overlap with each other at the joint portion JT, a gap is likely to occur between the rubber material 5 and the molding drum 51. As in this embodiment, the second pressing member 16b presses the rear end 5Rr against the molding drum 51, thereby making it possible to reduce the gap. Therefore, the uniformity of the tire 200 (see FIG. 1) can be improved.

[0058] In the above-described embodiment, the control device 90 is configured to further execute an extrusion process. As shown in FIG. 4F, the extrusion process can adjust the position of the rear end 5Rr of the rubber material 5 in the front-rear direction. That is, the joint amount of the joint portion JT can be adjusted. This makes it possible to adjust the joint amount of the joint portion JT of the rubber material 5 to an optimal amount. Therefore, the uniformity of the tire 200 (see FIG. 1) to be molded can be further improved.

[0059] Although the invention disclosed herein has been described in various ways, the invention disclosed herein is not limited to the above-mentioned embodiments and modifications unless otherwise specified. Furthermore, the configurations of the various embodiments and modifications mentioned above can be appropriately combined as long as they are not mutually inhibiting.

[0060] In the above embodiment, the stopper 14 is a member extending in the direction of the rotation axis CL of the molding drum 51, but is not limited thereto. The stopper 14 may extend in a direction inclined to either the left or right direction as viewed from above the molding drum 51 with respect to the direction of the rotation axis CL of the molding drum 51. When the end of the rubber material 5 is cut obliquely with respect to the longitudinal direction of the rubber material 5, the joint part JT of the rubber material 5 may be inclined to either the left or right direction as viewed from above the molding drum 51. In this case, it is preferable that the stopper 14 also extends in the same direction as the extension direction of the joint part JT as viewed from above the molding drum 51. In addition, it is preferable that the first pressing member 15b and the second pressing member 16b also extend in the same direction as the extension direction of the joint part JT.

[0061] The present invention (1) relates to a raw cover molding device. The raw cover molding device according to the present invention (1) is A cylindrical forming drum; A rotation mechanism that rotates the forming drum; A servicer supplies a rubber material having a length corresponding to the outer circumferential length of the molding drum toward the outer circumferential surface of the molding drum; a stopper disposed opposite to the outer peripheral surface of the forming drum and configured to regulate a front end of the rubber material supplied from the servicer; a first pressing member that presses a front end of the rubber material against the molding drum; a second pressing member that presses a rear end of the rubber material wound around the forming drum against the forming drum; It is equipped with:

[0062] The present invention (2) is a raw cover molding apparatus according to (1), the first pressing member is disposed on a side of the stopper where the servicer supplies the rubber material, The second pressing member is disposed on the opposite side of the stopper from the servicer.

[0063] The present invention (3) is a raw cover molding apparatus according to (1) or (2), A lifting mechanism that moves the stopper up and down along the radial direction of the forming drum; an extrusion mechanism that moves the stopper in a front-rear direction along an outer circumferential surface of the molding drum and extrudes a rear end of the rubber material by the stopper; It is equipped with:

[0064] The present invention (4) is a raw cover molding apparatus according to any one of (1) to (3), The roller is arranged so as to be aligned with the axial direction of the forming drum and is configured to be capable of approaching and moving away from the forming drum.

[0065] The present invention (5) is a raw cover molding apparatus according to (3), The lifting mechanism is configured to move the stopper between a first position where the front end of the rubber material does not contact the molding drum when the rubber material is supplied from the servicer to the molding drum, and a second position where the front end of the rubber material contacts the molding drum when the rubber material is supplied from the servicer to the molding drum.

[0066] The present invention (6) is a raw cover molding apparatus according to (5), a control device for controlling the servicer, the lifting mechanism, and the extrusion mechanism; The control device includes: moving the stopper from the first position to the second position; supplying the rubber material by the servicer until the rubber material contacts the stopper; moving the stopper from the second position to the first position; is configured to run.

[0067] The present invention (7) is a raw cover molding apparatus according to (6), The control device is configured to further execute a process of pressing the rubber material against the building drum with the first pressing member after the rubber material comes into contact with the stopper.

[0068] The present invention (8) is a raw cover molding apparatus according to (6), The control device includes: A process of winding the rubber material around the molding drum; a process of moving the stopper to the second position after the rubber material is wound around the molding drum; pressing the rubber material against the molding drum with the second pressing member; The method is configured to further perform the steps of:

[0069] The present invention (9) is a raw cover molding apparatus according to (8), The control device is further configured to execute a process of driving the pushing mechanism and moving the stopper. [Explanation of symbols]

[0070] 5. Rubber materials 5F front end 5Rr rear end 6a~6d Rubber materials 10 Wrapping device 11 Lifting mechanism 11a Main body 11b Cylinder 11ba Rod 11c Tabletop 12 Placement table 13 Arm 13b Vertical section 14 Stopper 15 Mechanism 15a Cylinder 15b Parts 15c Rod 16 Mechanism 16a Cylinder 16b Materials 16c Rod 17 Extrusion mechanism 17a Cylinder 17aa Rod 17b Extrusion member 30 Servicer 31 Endless Belt 32 Laura 33 Drive motor 40 Cutting device 51 Forming drum Segment 51a 52 Winding device 60 Pressing roller 61 Mobile Device 62 Roller section (roller) 70 Applicator 90 Control device 100 Low cover molding device 110~114 reel 200 Tires 210 Tread 221 Inner Liner 222 Carcass 223 Cushion Rubber 225 Breaker 226 Undertread rubber 227 Tread Rubber 228 Sidewall rubber CL Rotational axis JT Joint

Claims

1. A cylindrical forming drum; A rotation mechanism that rotates the forming drum; A servicer supplies a rubber material having a length corresponding to the outer circumferential length of the molding drum toward the outer circumferential surface of the molding drum; a stopper disposed opposite to the outer peripheral surface of the forming drum and configured to regulate a front end of the rubber material supplied from the servicer; a first pressing member that presses a front end of the rubber material against the molding drum; a second pressing member that presses a rear end of the rubber material wound around the forming drum against the forming drum; Equipped with Low cover molding device.

2. the first pressing member is disposed on a side of the stopper where the servicer supplies the rubber material, The raw cover molding device according to claim 1 , wherein the second pressing member is disposed on an opposite side of the stopper from the servicer.

3. A lifting mechanism that moves the stopper up and down along the radial direction of the forming drum; an extrusion mechanism that moves the stopper in a front-rear direction along an outer circumferential surface of the molding drum and extrudes a rear end of the rubber material by the stopper; The raw cover molding apparatus according to claim 1 or 2, further comprising:

4. The raw cover molding device according to claim 1 , further comprising a roller arranged so as to be aligned with the axial direction of the molding drum and configured to be capable of approaching and moving away from the molding drum.

5. The raw cover molding device of claim 3, wherein the lifting mechanism is configured to move the stopper between a first position where the front end of the rubber material does not contact the molding drum when the rubber material is supplied from the servicer to the molding drum, and a second position where the front end of the rubber material contacts the molding drum when the rubber material is supplied from the servicer to the molding drum.

6. a control device for controlling the servicer, the lifting mechanism, and the extrusion mechanism; The control device includes: moving the stopper from the first position to the second position; supplying the rubber material by the servicer until the rubber material contacts the stopper; moving the stopper from the second position to the first position; The raw cover molding apparatus of claim 5 , configured to perform the following:

7. The raw-cover molding device according to claim 6 , wherein the control device is configured to further execute a process of pressing the rubber material against the molding drum with the first pressing member after the rubber material comes into contact with the stopper.

8. The control device includes: A process of winding the rubber material around the molding drum; a process of moving the stopper to the second position after the rubber material is wound around the molding drum; pressing the rubber material against the molding drum with the second pressing member; The raw cover molding apparatus of claim 6 further configured to perform:

9. The raw cover molding apparatus according to claim 8 , wherein the control device is further configured to execute a process of driving the pushing mechanism and moving the stopper.

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