JPS58119846A - Apparatus for folding belt of pneumatic tire - Google Patents

Abstract

PURPOSE:To provide the titled apparatus having a simple structure and capable of increasing the length of folded part, by alternatively folding the overhang sections at the opposite sides of a belt material by a single turn-up ring and turn-up bladders provided to opposite sides of a molding drum. CONSTITUTION:The single turn-up ring 10 capable of being slid beyond the outer circumference of the molding drum 14 is provided to one of the sides of the molding drum 14 whose diameter can be changed. Using this turn-up ring 10 and the turn-up bladders 31, 32, the overhang sections of the opposite sides of the belt material (S) are alternatively folded by each side thereof.

Description

[Detailed description of the invention] The present invention relates to a belt folding device for pneumatic tires.

In order to improve the cornering and braking characteristics of radial automobile tires, when forming a steel cord belt, both ends of the cylindrically wound belt material are folded outward to improve its rigidity. ing. As a folding device for such a belt, a turn-up plader is provided on both sides of a belt forming drum whose diameter can be expanded or reduced, and by expanding the turn-up plader, the belt is wound endlessly on the forming drum. By enlarging the diameter of the overhang part of the attached belt material and then sliding the turn-up rings located axially outward of each of the above-mentioned turn-up plaids inward in the axial direction, the above-mentioned Nine methods are known in which the overhang part of the belt material is pushed down to the surface side of the forming drum via a turn-up plader (Special Publication No. 68).
(Refer to Publication No.-82880).

However, in the above-mentioned known folding device, turn-up rings are provided on both sides of the forming drum, and the turn-up rings on both sides are slid in opposite directions.Moreover, the turn-up rings are equipped with a steel cord. A/) Due to the strong forces involved in folding the material, a sturdy drive mechanism is required to slide the turn-up ring on the other side of the headstock, and this drive mechanism must be mounted on the forming drum. It is necessary to set a large sliding stroke so that the folded belt can be taken out, and the device as a whole has disadvantages such as being large and having a complicated structure. In addition, since the turn-up rings on both sides are simultaneously slid inward in the axial direction to fold the overhang part of the pair A/), the length of the overhang part on one side is half the length of the forming drum. If it exceeds the limit, it becomes impossible to press the end of the overhang portion against the surface of the forming drum by the turn-up ring, and it is necessary to provide a pressure bonding means separate from the turn-up ring.

The present invention provides a belt folding device which has a simple structure and is capable of deep folding in which the length of the overhang portion exceeds half the length of the forming drum.

That is, this invention has turn-up pladers on both sides of a forming drum whose diameter can be expanded or reduced, and by expanding these turn-up pladers, the molding drum is wound endlessly around the forming drum. By expanding the diameter of the overhang part of the belt material and then sliding the turn-up ring located axially outward of the turn-up plader inward in the axial direction, the belt material is expanded through the turn-up plader. L') In a pneumatic tire belt folding device in which the overhang part of the material is pushed down onto the forming drum, the turn-up ring is moved from one side of the forming drum to the other over the outer part of the forming drum. A pneumatic tire characterized by a single turn-up ring capable of sliding in the axial direction, the single turn-up ring acting alternately on both sides of the turn-up prada, one side at a time. This is a belt folding device.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, left and right bearings 1a, 1a'K and a hollow main shaft 2 of the main body frame l located in the center are rotatably supported, and a brake wheel 8 and a drive pulley 4 are mounted on the left protrusion of the main shaft 2. is fixed.

The main shaft 2 is rotated by a motor 5 provided at the lower part of the main body frame 1 via a motor shaft 5a1, a motor pulley 6, an endless belt 7, and the drive pulley 4. on the other hand,
An air supply inner cylinder 8 is fitted and fixed to the right protrusion of the main shaft 2, and an end face of an air supply outer cylinder 9 rotatably fitted to the air supply inner cylinder 8 is fixed to the main body frame l. The above-mentioned air supply inner cylinder 8 has two U-shaped air passages ga, gl) opened at both ends and extending in the axial direction.
One end of the air passages 8a and 8b is located at the contact surface with the air supply outer cylinder 9, and has an annular groove 9 cut into the inner surface thereof.
radial air passages 9C and 9 via a and 9b
d, and both other ends are located outside the end surface of the air supply outer cylinder 9.

A concentric turn-up ring IO is suspended from above so as to surround the air supply outer cylinder 9. That is, as shown in FIG. 2, two sliding shafts 12 and 12 are slidably supported parallel to the main shaft 2 by brackets 11 and 11 fixed to the upper surface of the main body frame l, At the end of the above-mentioned sliding shaft 12.12, there is a turn-up ring lO
However, two arms 1 protrude radially from the top.
0a.

They are connected and fixed via 10a. A ring fluid cylinder 18.1 is fixed to the front and back sides (left and right in FIG. 2) of the main body frame 1 in parallel with the main shaft 2, respectively.
The turn-up ring 1O is connected to the tip of the piston rod 18a%18a of No.8 through a short arm 101)%10'b protruding from the front and rear thereof, and by the operation of the ring fluid cylinders 1B and 18, The turn-up ring lO is adapted to be slid in the direction of the main shaft 2.

The sliding stroke of the turn-up ring IO is set to such an extent that the turn-up ring 10 can pass over the forming drum 14 (see FIG. 1) and reach the right side thereof, as will be described later.

A large diameter drum fluid cylinder 15 is attached to the left end surface of the main shaft 2.
is fixed, and its piston rod 16 is slidably inserted into the center hole 2a of the main shaft 2. The bases of a plurality of guide rods 18 that slidably pass through the outer end plate 15a of the fluid cylinder 15 are fixed to the piston 17, and the bases of a plurality of guide rods 18 are fixed to the piston 17. The stroke of the piston 17 can be adjusted by a nut 20.20 attached to the threaded end of the guide rod 18.

A hollow drum shaft 21 is connected to the right end of the main shaft 2 so as to extend the main shaft 2, and a sliding rod 22 connected to the piston rod 16 of the drum fluid cylinder 15 is connected to the center hole 21a of the drum shaft 21. inserted. On the other hand, flanges 28 and 24 are fixed to both ends of the surface of the drum shaft 21, and a sliding tube 25 is slidably fitted in the middle thereof. Two elongated holes 211) and 21b are bored in the center of the hollow drum shaft 21, diametrically opposed to each other. The sliding tube 25 and the sliding rod 22 are connected by a penetrating and slidable connecting pin 26. A plurality of drum segments 27 and the sliding tube 25, which are slidably attached in the radial direction between the left and right flanges 28 and 24, each have two parallel links 2.
8.28, and as the sliding tube 25 slides in the axial direction, the drum segment 27 slides in the radial direction. These plurality of drum segments 27 are arranged in the circumferential direction to constitute the forming drum 14, and when the drum segment 27 is located at the radially inner end of its sliding stroke, the adjacent outer surface portion 27a contact each other to form a cylindrical surface, and by sliding outward the diameter is enlarged.

Inward flanges 29a and 80a of Prada support cylinders 29 and 80 are fixed to the outer surfaces of the flanges 28 and 24, respectively, and turn-up Pradas 31 and 32 are attached to the surfaces of the Prada support cylinders 2q and 80, respectively. . The air passage 8a of the air supply inner cylinder 8 is connected to the left turn-up Prada 81 via an air passage (not shown) bored in the left Prada support cylinder 29 and a hose 83. The turn-up Prada 82 has an air passageway (not shown) and a hose 84 bored in the Prada support cylinder 80 on the right side.
The air passage 8b of the air supply inner cylinder 8 is connected to the air passage 8b through the air supply inner cylinder 8.

In the above structure, the piston 17 of the drum fluid cylinder 15 is moved to the right from the position shown in FIG. 1, and the piston rod 16. When the sliding tube 25 is slid to the right via the sliding rod 22 and the connecting pin 26, the link 28 tilts and draws the drum segment 27 radially inward, thereby reducing the diameter of the forming drum 14. Ru. In this state, as shown in FIG. 8, the belt material S is endlessly wound around the outer periphery of the forming drum 14 (drum segment 27). Thereafter, when the piston 17 of the drum fluid cylinder 15 is moved to the left (see Fig. 1), the diameter of the forming drum 14 is expanded, and the center portion of the belt material S is tensioned as shown in Fig. 4. The overhang portion forms a conical surface. At this time, by operating the ring fluid cylinder 18.13, the turn-up ring 10 is pushed out a certain distance to the right via its piston rod 13a118a, and its right end surface is attached to the left overhang part of the belt material S. It stops slightly beyond the left edge. Next, when pressurized air is supplied to the air passage 9C of the air supply outer cylinder 9 fixed to the main body frame l, this pressurized air flows through the annular groove 9a, the air passage 8a1 of the air supply inner cylinder 8, the hose 38, and the Prada. The air is fed into the left turn-up Prada 81 through an air passage (not shown) in the support cylinder 29, and is then fed into the turn-up Prada 81 on the left side as shown in FIG.
1 expands, and the left overhang portion of the belt material S is bent into an enlarged diameter shape. In this state, when the turn-up ring 10 is further advanced to the right, the turn-up ring 10 moves the turn-up plater 31 as shown in FIG.
The upper part of the belt material S is pushed down together with the left overhang part of the belt material S and folded onto the surface side of the forming drum 14. After the overhang portion is folded, the pressurized air in the turn-up pladder 81 is removed to contract the turn-up pladder 31, and as shown in FIG. separated from IO. The above-mentioned turn-up ring 10 is advanced to the right as it is, and after this turn-up ring 10 passes over the above-mentioned turn-up bladder 31, pressurized air is supplied to this turn-up bladder 31 as shown in FIG. By feeding and expanding again, the turn-up Prada 81 superimposed on the surface of the forming drum 14 is turned into the forming drum 14.
The pressurized air in the turn-up prudder 31 is then removed, and the turn-up prudder 31 is returned to its initial position as shown in FIG. In addition, during this time, turn-up ring 10II'i
, move to the right standby position and stop. On the other hand, the right side overhang part of the belt material S advances the turn-up ring 10 located on the right side to the left, and connects the right side turn-up plater 82 from the air passage 9d of the air supply outer cylinder 9 to the annular groove 9'. b1 By sending pressurized air through the air passage 8b of the air supply inner cylinder 8, the hose 34, and the air passage (not shown) provided in the right bladder support cylinder 30, the above-mentioned left overhang part Fold 1 in the same order as . Then, the obtained belt is extracted to the right side of the forming drum 14 after the forming drum 14 is reduced in diameter.

In the above embodiment, the number of guide sliding shafts 12 and ring fluid cylinders 18 of the turn-up ring IO can be increased or decreased as appropriate. Further, a motor can be used in place of the ring fluid cylinder 18, and the turn-up ring IO can be slid through a feed screw or a pinion-rack mechanism. Moreover, instead of providing the air supply inner cylinder 8 and the air supply outer cylinder 9, the piston rod 16 of the drum fluid cylinder 15 is made to protrude outward from the outer end plate 16a, and a dual rotary fluid joint is attached to the protruding end. rod 16
Air may be supplied to the turn-up Prada 81, 82 using the space of the center hole provided in the main shaft 2 and the center hole 2a of the main shaft 2. It goes without saying that the mechanism for enlarging and reducing the diameter of the forming drum 14 is not limited to the structure of the above embodiment.

As explained above, the present invention provides a single turn-up ring that is capable of sliding axially over the outer circumference of the forming drum from one side of the forming drum to the other;
This single turn-up ring is used to alternately fold the overhang parts on both sides of the belt material, so the axial length of the overhang part is more than half the axial length of the belt. It can be folded without any trouble, and since a tail stock is not required, the structure is simple and the resulting belt can be easily removed.

[Brief explanation of drawings]

FIG. 1 is a vertical cut front view of an embodiment of the present invention, FIG. 2 is a right side view of FIG. 1, and FIGS. 8 to 9 are illustrations of the folding order. l: Main body frame, 2: Main shaft, lO: Turn-up ring, 10a, 1 (Jb: 7-m, 12: Sliding shaft,
18; Fluid cylinder for ring, 14: Seijin drum, 15
Fluid cylinder for Ni drum, 27: Drum segment, 8
1.82: Turn up Prada. Patent applicant Toyo Rubber Industries Co., Ltd. Agent Patent attorney Takeo Sakano Yoshi 1) Tsukasa Ryo Figure 2 Cormorant llJZ3Q

Claims (1)

[Claims] (1) It has a turn-up Prada on both sides of the forming drum which can enlarge or reduce the diameter by expanding this turn-up Prada. The overhang part of the belt material endlessly wound around the forming drum is expanded in diameter, and then the turn-up ring located axially outward of the turn-up Prada is slid axially inward. In a pneumatic tire belt folding device in which the overhang portion of the belt material is pushed down onto the forming drum via the turn-up ring, the turn-up ring is moved from one side of the forming drum to the other side. A single turn-up ring that can be slid axially over the outer circumference of the forming drum, and this single turn-up ring acts alternately on both sides of the turn-up plate. A pneumatic tire belt folding device characterized by: [2] The turn-up ring is fixed to a plurality of sliding shafts located outward in the radial direction via arms protruding from the surfaces of the turn-up ring, as set forth in claim 1. pneumatic tire belt folding device.