JPS5850584B2 - tire forming drum - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a drum for forming sudare in the manufacturing process of bicycle tires. The purpose of this is to significantly improve product quality and production efficiency by carrying out the process efficiently and accurately, as well as to make it easier to take out and transport the sagging molded product from the drum in the next process.

Conventionally, various types of equipment have been developed and used for tire forming drums, in which bias-like sudare cloth is wrapped endlessly and a ring-shaped bead wire is set on top of the tire-forming drum. The method used is to expand and contract the support arm with arc-shaped segments attached to it in the radial direction, wrap a sudare cloth around each segment, and then set a beat wire. The larger the expansion rate, the wider the gap is formed between the segments.For this reason, when rollers are used for the sudare folding operation, the adhesive force between the sudare plies is limited to only the segment portions that are crimped by the roller, and the gap between the segments is limited. Since the rollers do not press into the gaps between the plies, the plies do not come into close contact with each other in this area, causing wrinkles and adversely affecting product quality.
If the sudare folding jig is placed separately from the drum body and folded, the folding operation can be performed close to the drum body, but since it is a separate device, a separate frame is required, making it difficult to insert the bead wire and take out the molded product. Furthermore, various ideas have been made to reduce the gap between the segments, but all of them have the problem of increasing the number of segments, making the structure complex, and increasing costs.

On the other hand, another method is to fix ring-shaped air bags on both sides of the tire-forming drum, wrap the sudare around the forming drum in a flat position lying on the support drum, and support both edges of the sudare on the air bags. There is a method of setting the bead wire, then expanding the forming drum, inflating the air bag, and folding the sag around the bead wire using a sleeve that stretches the air bag over the drum surface. In this method, the air bag is usually subjected to severe repeated bending deformation, which may result in air leakage, and there is an inherent concern that if such an accident occurs, subsequent molding operations will be completely impossible. are doing.

The present invention solves the problems of the conventional methods as described above, and provides a sudare forming drum in one step for automating the entire tire manufacturing process.The present invention is characterized by: The sudare cloth wrapped around the forming drum is folded along the axial direction of the drum's outer circumferential surface while being in full contact with the sudare cloth using a cylindrical sudare folding device consisting of a group of rubber-covered rectangular plate spring pieces attached to both sides of the drum. By automatically and accurately performing the insertion movement and folding back operation, and by deforming and dividing the folding molding drum and folding device in an integrated state, it is possible to take out and convey the folded molded body from the drum in the next process. The structure of the forming drum is designed to facilitate the process.

Hereinafter, the tire forming drum according to the present invention will be explained in detail with further reference to the accompanying drawings.

Fig. 1 is a side sectional view of a tire forming drum according to the present invention, and Fig. 2 is a front view of the same.
00, and the side folding devices 200 and 200' located on both sides of the drum body 100 and functioning in cooperation with the drum body 100.

Furthermore, since the dimensions of the forming drum body and the folding device are approximately the same, and the supporting mechanisms are also of the same configuration, most of the important parts of the forming drum are hidden by the folding device in the front view of Figure 2. .

The Sudare forming drum 100 is basically a cylindrical drum plate 1 having grooves G and σ for attaching bead wires at regular intervals along the circumferential direction of the tire forming drum. It is supported by a T-shaped support arm 2 having the same shape as the support arm 12 of the folding device 200, via a fixed metal M inserted and fixed to the shaft S.

On the other hand, as shown in FIGS. 1 and 2, in the Sudare folding device 200, 200', a large number of rectangular spring pieces 15, 15' are arranged in the direction of the forming drum 100 along the outer peripheral surface of the circular ribs 11, 11'. The entire surface of the leaf spring piece groups 15 and 15' as well as the leaf spring piece group 15
, 15' are a pair of cylindrical drums with leaf springs whose boundaries are covered with thin rubber layers 16, 16', and are located on both sides of the forming drum 100, and these are formed by circular ribs 11, 11. The molding drum 100 has T-shaped support arms 12, 12' that can be integrated with the ring-shaped support parts 13, 13' mounted over approximately the entire circumference of the inner peripheral surface of the molding drum 100.
The tips of the cylindrical leaf spring pieces 15 and 15' are supported by being inserted on both sides of the shaft S of the forming drum 100, and the tips of the cylindrical leaf spring pieces 15 and 15' are aligned oppositely on both sides of the outer periphery of the cylindrical drum plate 1 of the forming drum 100, as shown in FIG. The cylindrical drum plate 1 of the forming drum 100 and the circular ribs 11, 11 of the folding device 200, 200' are inserted into the forming drum 100 and integrated with the forming drum 100.
space parts c and c' are formed between the two.

Therefore, the above-mentioned forming drum main body 100 and folding device 2
00.20σ is integrated with the molding drum 100. The air cylinder 4゜4' is connected to pistons 3 and 3' having locking tools 5 and 5' at their tips, respectively.
(see Fig. 2), and the lower ends of each are locked on the inner peripheral surface of the cylindrical drum plate 1 by pins 6 and 6', while the upper ends are attached to the folding devices 200 and 20.
A ring in which a guide locking rod 7.7 having a length equal to the full width of the tire building drum when expanded at 0' is integrated into the inner peripheral surface of the circular ribs 11, 11' of the folding device 200°200'. The distal ends of the shaped bearing parts 13 and 13', the locking tools 5 and 5' of the piston 3°3' located on the inner surface of the cylindrical drum 1, and the cylindrical drum plate 1 (not shown)
The folding device 200.2 is integrally attached to the inner peripheral surface of the
The ring-shaped support parts 13 and 13' of 00' are inserted through and connected to the tip ends of ring-shaped support parts that have approximately the same dimensions and shape. (7.γ is fixed at the same time as it penetrates) Also, the guide support portions 8° 8' are provided at positions slightly lower than the tips of the ring-shaped support portions, respectively, and the folding devices 200, 200'! The ring-shaped bearing 13.13 and the ring-shaped bearing of the forming drum body 100 are connected through the ring.

Note that the guide support portions 8, 8' are connected to the pistons 3, 3.
' is not penetrated.

Further, the ring-shaped support portion of the forming drum includes a guide support portion 8,
8' passes through and is fixed.

The tire forming drum constructed as described above includes a forming drum 100 and a folding device 2 as shown in FIG.
x, x' on the circumference with 00, 200' integrated
, y point, the pistons 3, 3' contract by the operation of the air cylinders 4, 4', and at the same time the locking tool 5
, 5' connect the respective ring-shaped support parts and the guide support parts 8, 8' (dotted line in Figure 1) are used as fulcrums to connect the tips of the respective ring-shaped support parts and the locking tools 5, 5'. Pull the guide locking rods 7, 7' downward and remove the molding drum 1.
00 cylindrical drum plate 1 and Sudare folding device 200, 2
The arc-shaped dividing plates R and R' in which the rectangular plate spring pieces 15 and 15' of 00' are integrated can be folded inward of the drum to deform and divide them, and the piston 3°3'
It is a mechanism that returns to the original circular drum by returning it to its original state.

Further, on the outer circumferential surface of the cylindrical drum plate 1 of the forming drum 100, vacuum suction holes are provided at a plurality of locations in order to strengthen the wrapping and suction of the sag, as will be described later.

The forming drum according to the present invention has a constant outer circumferential length, and if the tire size changes, it can be replaced with a forming drum of a size corresponding to the tire size.

Next, the details of the sudare folding devices 200° 200' inserted into both sides of the cylindrical drum plate 1 of the forming drum 100 will be explained.
The 0 side is in an oven state, but the opposite side of the sudare folding device 200' has a shaft S as shown in FIG.
A cylindrical bushing 21 that is movable in the axial direction is inserted at the top, and a ring-shaped shifter 20 that has a groove in the center and is movable on the bushing 21 is inserted on the left side of the bushing 21. On the other hand, on the right side, a ring-shaped shifter 20' having a concave groove in the center is inserted and integrated onto the bush 21.

The ring-shaped shifter 20 is a ring-shaped bush that passes through the T-shaped support arm 12' of the folding device 200' and the T-shaped support arm 2 of the forming drum 100, and is integrated with the T-shaped support arm 12 of one of the folding devices 200. Nala l- on 14
Pull rod 1 is tightened and fixed by 18, 18'
7 and 1γ, and is integrated with the pull rods 17 and 17' by fixing tools 19 and 19' such as fixing bolts and nuts in the concave groove of the shifter 20.

This ring-shaped shifter 20 is further connected via a swing arm 24 to an air cylinder 32 mounted on a machine base 40 with a locking pin 33, as shown in FIG.

Thus, in the ring-shaped grooved shifter 20, the piston 31 and the locking tool 30 are extended by the operation of the air cylinder 32, and at the same time the shifter 20 is connected to the swinging arm 24.
The pull rods 17 and 17', which are connected and integrated with the ring-shaped bushing 14 of the shifter 20 and the folding device 200, move in the left-right direction on the cylindrical bushing 21 using the intermediate locking part 23 as a fulcrum. The folding device 200 consisting of a shaped drum is pulled to the right, the cylindrical leaf spring piece group 15 is inserted onto the outer peripheral surface of the cylindrical drum plate 1 of the forming drum 100, and the shifter 20 is moved to the other shifter -2σ position. Move and stop.

Next, the air cylinder 32 is operated again to cause the piston 31 to contract and return, and at the same time, the swinging arm 24 is moved to the intermediate locking portion 2.
By pushing the shifter 20 and the pull rods 17, 17 connected thereto to the left using the shifter 3 as a fulcrum, the folding device 200 returns to its original position.

Note that in addition to the normal function, the shifter 20 described above also has a type of bushing function.

On the other hand, the sudare folding device 200' on the right side facing the sudare folding device 200 has a ring whose other end supports the folding device 20σ, which is integrated with the grooved shifter 20′. It is attached integrally with the shaped bush 14', and a locking pin 3 is also mounted on the machine base 40.
Air cylinder 32' attached at 3' and swing arm 2
4'.

Contrary to the shifter 20, the ring-shaped grooved shifter 20' causes the swinging arm 20 to contract when the piston 31' and the locking member 30' contract due to the operation of the air cylinder 32'.
4' presses the shifter 2σ connected to the intermediate locking part 23' using the intermediate locking part 23' as a fulcrum, and at the same time, due to this pressing force, the cylindrical bushing 21 connected to the shifter 20' moves leftward on the axis S. Furthermore, the sagging folding device 200' of the cylindrical drum with a leaf spring, which is connected and integrated with the cylindrical bushing 21 and the ring-shaped bushing 14, is moved to the left, so that the cylindrical leaf spring piece group 15' is attached to the forming drum 100. It is inserted onto the outer peripheral surface of the cylindrical drum plate 1, and the shifter 20' moves to the position of the other shifter 20 and stops there.

In addition, in the case of return, contrary to the case of the folding device 200, the piston 31' of the air cylinder 32' is extended, so that the folding folding device 200' returns to the shifter 20.
' and the tensile force of the cylindrical bushing 21 causes the stopper 22 to return to its original position.

In this way, the Sudare folding devices 200, 200' move,
The mechanism is such that the folding operation is performed by repeating the return operation, but usually one of the folding devices 200 is returned first, and then the other folding device 200 facing the opposite direction is returned.
0' is moved and returned.

The tire forming drum according to the present invention has the above-mentioned structure.Next, the functions of the sag winding mechanism and the sag folding mechanism of the tire forming drum of the present invention will be explained based on examples.

First, as shown in FIG.
The bias-shaped sudare cloth F cut into a predetermined length and transported by the sudare conveyance device has its tip adsorbed through a vacuum suction hole H provided in a triangular shape at a predetermined position of the cylindrical drum plate 1 of the forming drum 100. After that, the forming drum 10
0 rotates once together with the folding device 200 and 200', which causes the folding of the cylindrical drum plate 1 to be performed at multiple locations, usually at positions slightly below the drum dividing planes X and X in FIG. The cylindrical drum plate 1 is strongly attracted to the suction hole H of
is wrapped around the outer circumferential surface of F, and both ends of Sudare F are joined at the same time.

In this case, both sides of Sudare F are folding devices 200.200.
' is wrapped with a portion sticking out.

4 to 8 are explanatory diagrams showing the folding action of the folding mechanism according to the present invention. FIG. With the drum 100 and the sudare folding device 200° 200' in the expanded state, the sudare F of a predetermined length is wrapped around the outer peripheral surface of the cylindrical drum plate 1 of the forming drum 100 as described above.After the joint is made, the drum is once fully expanded. Then, by operating the air cylinders 4, 4', the pistons 3, 3' are contracted to deform and contract the arc-shaped dividing plates R, R' inward one after another as shown in FIG. (the bead wires B and B' are loosened and deformed inwardly of the drum following the dividing plate), and the bead wires B and B' are set on the forming drum 10 using another bead wire setting device located adjacent to the drum.
Set the air cylinders 4, 4 to the specified position again.
', the pistons 3, 3' are sequentially extended and restored, and the dividing plate y and then the dividing plate R are returned to the original circular drum, so that the bead wires B and B' as shown in FIG. ■It is in a state where it is inserted into the grooves G and d together with the sag F.

FIG. 6 shows the next step in which the piston 31 is extended by the operation of the air cylinder 32, and the folding device 200 is moved by pulling the shifter 20 and the pull rod 17° 17' connected thereto.
Due to the movement of 0, the tips of a large number of rectangular leaf spring pieces 15 arranged laterally along the entire outer circumference of the circular rib 11 as shown in FIG. 3 cover a part of the folding device 200.
It is folded back onto the cylindrical drum 1 while wrapping the bead wire B without being in full contact with the bead wire B.

At this time, since the entire surface of the cylindrical leaf spring piece group 15 and the gaps between the leaf spring pieces 15 and 15 are coated with a thin rubber layer 16, the entire cylindrical leaf spring piece group 15 is covered with a very small amount. It deforms into a conical shape and exhibits a kind of conical spring elasticity, allowing the sagging cloth F to be folded back smoothly.

If a rubber layer is not interposed in the gap between the leaf spring pieces, the tips of the leaf spring pieces will spread out, creating a gap, and there is a risk that the tips of the leaf spring pieces will break the sag.

Next, when the folding operation by the folding device 200 is completed, the folding device 200 returns to its original position by actuation of the air cylinder 32.

Then, at the same time as the folding device 200 returns, the other folding device 200' opposite to this returns to the air cylinder 3.
2', it moves to the left as shown in Figure 7, wraps the other bead wire, and folds the other sudare cloth F over the folded overlapping part T and wraps it around another rubber roll. After pressing the top of the leaf spring piece 15 with the drum and rotating the drum once, the air cylinder 32 is activated to return the folding device 200' to wrap the bead wires B and f at both ends as shown in FIG. In addition, a joint having a width W (normal beat interval y3) is formed in the center, and a sagging molded body is formed which has an overlapping allowance for three layers, which are normally formed in this part.

In this way, the sudare turning operation can be repeated by operating the air cylinders 32, 32' to move and return the shifters 20, 20' inserted on the shaft S. When the cylinders 4, 4 are operated, the circular ribs 11, 11' of the cylindrical drum plate 1 of the forming drum 100 and the circular ribs 11, 11' of the folding device 200, 200' integrated therewith are moved inside the drum. After dividing and deforming, the sagging molded body is taken out by another sagging molded body taking out device, and is transferred and conveyed to a device for the next step of tread application.

In the above description, it goes without saying that the design of each component of the apparatus of the present invention may be modified as appropriate without departing from the purpose thereof.

As described above, the tire forming drum according to the present invention has a cylindrical forming drum main body and a sagging folding device having a cylindrical group of rubberized rectangular leaf spring pieces on both sides of the main body, which are integrally integrated with the forming drum. The attached tire forming drum, in which the forming drum and folding device are integrated and divided,
It is equipped with a mechanism in which the drum can be returned to its original position, and the sagging folding devices on both sides of the drum can alternately move and return automatically, and have various remarkable effects as described below.

(1) The division and return of the entire drum as well as the folding back of the sudare cloth wrapped around the drum are all performed automatically, reducing man-hours and significantly improving efficiency compared to conventional manual intermittent work. Ru.

(2) Since this method presses the sagging cloth over the entire surface of the forming drum, it is compared to the conventional expanding method, in which multiple supporting arms are expanded in the radial direction to form wide gaps between each segment. The adhesion between the shidare plies can be significantly improved, and the quality of the product can be improved.

(3) The Sudare folding device is composed of a large number of rectangular leaf spring pieces in a cylindrical shape, and a rubber layer is interposed between the surfaces of the leaf spring pieces and the gaps between the leaf spring pieces so that they are in full contact with each other. , it is possible to exhibit conical spring elasticity, and it is possible to perform the sag folding operation smoothly without damaging the sagging cloth.

(4) Mume, which is a mechanism for dividing and returning the molding drum and the sag folding device, is integrated, and these operations can be easily performed in relation to the bead wire setting operation, which is a separate process, and the removal of the sudare molded body. .

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a tire forming drum according to the present invention;
2 is a front view of FIG. 1, FIG. 3 is a plan view of FIG. 1, and FIGS. 4 to 8 are partial side sectional views showing the sag folding action of the sagging folding device of the present invention. 1...Cylindrical drum plate, 2...T-shaped support arm, 3゜3'...Zeston, 4, 4'...
...air cylinder, 5.5'...locking tool, 6,6'...locking pin, 7. γ・・・・・・
Guide locking rod, 8, 8'...Guide support part, 1
1゜11'...Circular rib, 12,12'...
...T-shaped support arm, 13, 13'...Ring-shaped support part, 14, 14'...Ring-shaped bush 15.15'...Rectangular leaf spring piece, 16
, 16'...Rubber coating layer, 17...
Pull rod, 18... Nut, 19, 19'.
...Fixing tool, 20.20'...Ring-shaped shifter, 21...Cylindrical bushing, 22...
... Stopper, 23, 23'... Intermediate locking part, 24, 24'... Swing arm, 25, 25
'...Locking pin, 30, 30'...
Locking tool, 31, 31'... Piston, 32, 3
2'...Air cylinder 33.33'...
... Locking pin, 40 ... Machine base.

Claims (1)

[Claims] 1. A group of rectangular leaf spring pieces are attached to the entire outer circumference of a circular rib on both outer peripheral surfaces of a cylindrical divided drum whose circumference can be folded inward by approximately half of its circumference by air cylinder pressure. A cylindrical sudare folding device having approximately the same diameter as the divided drum and having a thin rubber layer coated on the entire surface of the group of leaf spring pieces and the gaps between the leaf spring pieces is inserted oppositely to the drum. The cylindrical folding device on both sides can be moved back and forth along the outer peripheral surface of the drum by air cylinder pressure, and the cylindrical folding device is formed integrally with the drum so that it can be divided and returned. Tire molding drum.