JPH0137261B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a rubber tube with relatively low rigidity;
The present invention relates to a method and apparatus for accurately winding a rubber band material for tire manufacturing, such as a side tread, a breaker undercut, or some combination thereof, onto a tire building drum.

In the tire manufacturing industry, it is desired to automate the tire manufacturing process, increase productivity, and manufacture tires of excellent quality without relying on human labor. In particular, in the molding process where unvulcanized rubber materials and other parts are wrapped around a tire-molding drum to produce green tires (tires before vulcanization), a large number of flexible parts must be accurately wrapped around the tire-molding drum. Because of this, the work was complicated and required advanced technology. Conventionally, it has been extremely difficult to automate the technology of accurately wrapping the above-mentioned band-shaped rubber material with low rigidity around a tire-building drum.
There is a method described in Publication No. 131681, but there are problems such as the inability to keep applying sufficient tension to the rubber band material while wrapping the rubber band material around the tire-molding drum, and the inability to accurately position the joint. There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for accurately wrapping a rubber band material, particularly a rubber band material with low rigidity, around a tire molding drum in a molding process without relying on human hands.

These purposes include the steps of holding the leading end of the band-shaped rubber material in the state in which it was cut by the first holding means, transferring it to the tire-building drum and press-bonding it; and separating the holding means; rotating the tire building drum while applying tension to the rubber band material; and winding the rubber band material by a predetermined length around the tire building drum; 2nd material
a step of holding the rubber band material with the holding means; and a step of cutting the rubber band material near the rear side of the portion held by the second holding means and holding the rear end of the rubber band material in the cut state with the second holding means. and a step of rotating the tire building drum while applying tension to the band-shaped rubber material by the second holding means to wrap the remaining band-shaped rubber material around the tire-building drum; crimping the trailing end to the forming drum;
and moving the tire building drum, the first holding means for holding the tip of the band-shaped rubber material in the state in which the tip was cut, and the first holding means holding the tip of the band-shaped rubber material to the tire building drum. A first holding means movement mechanism that presses the rubber band material onto the tire building drum and then separates it from the tire building drum; and a mechanism that rotates the tire building drum to wrap the rubber band material to a predetermined length around the tire building drum. a tension mechanism for applying tension to the tire forming drum; a second holding means for holding the band-shaped rubber material being wound around the tire-building drum; A cutting mechanism that converts the part held in the cut state by the cutting mechanism into the rear end of the rubber band material, and a second holding means that holds the rear end of the rubber band material to the rubber band material while the tire forming drum is rotating. A second holding means moving mechanism that moves the remaining rubber band material to create tension and wraps the remaining rubber band material around the tire building drum, and then presses the rear end of the rubber band material to the tire building drum. This can be achieved by a device that wraps a strip of rubber material around a tire building drum.

Next, one embodiment of the apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a front view of an embodiment of the apparatus of the present invention, and FIG. 2 is a side view thereof. Reference numeral 1 denotes a tire molding drum which is rotatable and whose diameter can be expanded or contracted, and a green tire is manufactured by winding or attaching various members to this tire molding drum 1. 2 is a base, and frames 3 and 4 are installed on this base 2. A pair of pulse motors 5 and 6 are installed on the frame 3,
The output shaft of each pulse motor 5, 6 has a screw shaft 8, 9 parallel to the traveling direction of the band-shaped rubber material 7.
are connected to each other. 10, 11 are guide shafts parallel to the screw shafts 8, 9, and both ends of the screw shafts 8, 9 and guide shafts 10, 11 are provided with bearings 12, 11, respectively.
It is rotatably supported by 13. 14 is a screw shaft 8 and a guide shaft 10,
A first movable base 11 is supported, and a second movable base 15 is supported by the screw shaft 9, the guide shaft 9, and the guide shafts 10 and 11. The first and second movable tables are 14 and 15.
are moved independently as the screw shafts 8, 9 are rotated by the pulse motors 5, 6. Lifting means 16, 17, 18, 19, for example, a fluid cylinder, are installed on the upper surfaces of the first and second movable tables 14, 15. A second holding means 21 is attached to each. These first and second holding means 20 and 21 are vertically moved independently by the operation of the elevating means 16, 17, 18, and 19, respectively. The aforementioned pulse motor 5, screw shaft 8, first moving table 14, and lifting means 16 and 17 constitute the first holding means moving mechanism 22 as a whole, and the pulse motor 6, screw shaft 9, and second moving Platform 15, lifting means 1
8 and 19 constitute a second holding means moving mechanism 23. 3 and 4 show the first holding means 20, in which 24 indicates the elevating means 16, 17.
On this stand 24 is supported an elastic tubular body 25 which is closed at both ends and is made of a material such as rubber and includes a reinforcing layer, and this elastic tubular body 25 is made of a band-shaped rubber material. 7, that is, the axial direction of the tire building drum 1, and is longer than the width of the band-shaped rubber material 7. Air holes (not shown) are formed in this elastic tubular body 25,
This air hole communicates with a source of compressed air. An elastic plate 26 having approximately the same length as the elastic tubular body 25 is attached to the upper surface of the elastic tubular body 25. The elastic plate 26 is made of vulcanized rubber or the like, and has a smooth upper surface. Note that this elastic plate 26 is connected to the elastic tubular body 2.
It is not necessary as long as the upper surface of 5 is smooth. As shown in FIG. 5, the second holding means 21 is also composed of a stand 27, an elastic tubular body 28, and an elastic plate 29, but since these are the same as the first holding means 20, a description thereof will be omitted. As shown in FIGS. 1 and 2, the frame 4 is provided with a pressing mechanism 30 and a cutting mechanism 31. The pressing mechanism 30 includes air cylinders 32 and 33 attached to the frame 4 and rods 3 of these air cylinders 32 and 33.
It consists of a pressing plate 36 attached to the tips of 4 and 35. As shown in FIG. 5, the pressing plate 36 is lowered by the first holding means 20 and the second holding means 21.
is located below the pressing plate 36, and at this time, the air in the elastic tubular bodies 25, 28 of the first holding means 20 and the second holding means 21 is discharged from air holes (not shown). In this way, the unvulcanized band-shaped rubber material 7 is held by the elastic plates 26, 29 as if by suction, since the upper surfaces of the elastic plates 26, 29 have smooth surfaces. The cutting mechanism 31 is a cutter 3 as shown in FIG.
7. Fixed block 38 and cutter drive means 39
It consists of The cutter drive means 39 has a motor 40 fixed on the frame 4. A pair of bearings 41 and 42 fixed to the frame 4 rotatably support both ends of a drive shaft 43 parallel to the elastic tubular body 25.
Power is transmitted to the motor 3 from the output shaft of the motor 40 via a belt 44. 45 and 46 are guide shafts parallel to the drive shaft 43. Both ends of these guide shafts 45, 46 are supported by the bearings 41, 42, respectively. 47 is a drive shaft 43 and a guide shaft 4
5 and 46, and this slider 47 moves along guide shafts 45 and 46 as drive shaft 43 rotates. The base ends of a pair of arms 48 and 49 are attached to the slider 47, and the rear end of an air cylinder 50 is rotatably connected to the slider 47. Said fixed block 3
8 is rotatably connected to the tips of the arms 48 and 49 via a pin 51, and is connected to an air cylinder 50.
The piston rod 52 is rotatably connected to the tip of the piston rod 52. Therefore, when the air cylinder 50 is actuated, the fixed block 38 rotates about the pin 51. The counter 37 is fixed to a fixed block 38, and the cutter 37 is heated to a steady state at a high temperature by a heating mechanism (not shown) attached to the fixed block 38, if necessary. Reference numeral 53 denotes a conveyance mechanism for conveying the band-shaped rubber material 7, and is comprised of suitable means such as a roller conveyor. 54 is a tension mechanism, which is a brake roll 54 in this embodiment. The brake roll 54 is attached to the conveyance mechanism 53,
Appropriate tension is applied to the rubber band material 7 when the rubber band material 7 is wound around the tire molding drum 1. The tension mechanism 54 may be further provided with another roller to sandwich the band-shaped rubber material 7, or may be controlled so that the rotation of the brake roll 54 is performed in accordance with the rotation of the tire building drum 1, if necessary. In this embodiment, there is a control mechanism not shown, and this control mechanism includes the tire building drum 1, the first and second holding means moving mechanisms 2
2, 23, the pressing mechanism 30, the cutting mechanism 31, etc. are controlled.

Next, an embodiment of the method of the present invention will be described using the apparatus of the embodiment described above.

First, in a preparatory stage, a belt-shaped rubber material 7 that integrates, for example, a rubber tread, a side tread, and a breaker undercut is unwound from a stock roll (not shown) onto the tire molding drum 1 on which other members are wound. The tip is passed over the roll 54 and the transport mechanism 53, and transferred onto the first holding means 20 and the second holding means 21, which are waiting in advance directly below the pressing mechanism 30. Next, rod 3 of air cylinders 32 and 33
4 and 35 to protrude, and the band-shaped rubber material 7 is held by the first holding means 20 and the second holding means 21 by the pressing plate 36.
the elastic plates 26, 29 of. At this time, the air inside the elastic tubular bodies 25 and 28 is exhausted and the elastic tubular body 2
5 and 28 are crushed, and the band-shaped rubber material 7 is strongly pressed against the elastic plates 26, 29 with smooth surfaces, so that the band-shaped rubber material 7 is attached to the elastic plates 26, 29 as if it were adsorbed to the surface. It is held only by the lower surface on the opposite side from the tire building drum 1. Next, as the pressing plate 36 rises, the slider 47, which had been moved to one side in the width direction of the band-shaped rubber material 7, is moved after the piston rod 52 of the air cylinder 50 is projected to a predetermined position and the fixed block 38 is rotated. The belt-shaped rubber material 7 is moved to the other side in the width direction by the rotation of the drive shaft 43 rotated by the motor 40 along the guide shafts 45 and 46 . At this time, as shown in Figure 2,
The temperature is maintained at a constant high temperature in advance if necessary. The cutter 37 includes the first holding means 20 and the second holding means 2.
The band-shaped rubber material 7 is cut while passing through the space between the rubber bands 1 and 1. As a result, the tip of the band-shaped rubber material 7 is held by the first holding stage 20 in the state in which it was cut by the cutter 37. In addition, the second holding means 21
The upper strip of rubber material 7 is removed and the second holding means 21 is lowered and moved to the left in the figure.
The preparation is now complete. Next, the operation will be sequentially explained with reference to FIG. In FIG. 6, the lower end of the tire molding drum 1 and the belt-shaped rubber material 7 on the conveying mechanism 53 are shown.
are located on the same horizontal plane. In the first stage, as shown in FIG. 6a, first the first holding means 20 is lowered, and then, while holding the tip of the band-shaped rubber material 7, the first holding means 20 moves to the left side of the figure, and the tire It stops directly below the forming drum 1. Next, the first holding means 20 rises and presses the tip of the band-shaped rubber material 7 against the tire building drum 1. At this time, air is introduced into the elastic tubular body 25 and it expands, so other materials are wrapped around the tire building drum 1 as shown in FIG. Even if there are irregularities, the elastic tubular body 25 deforms along the irregularities. Therefore, the band-shaped rubber material 7 can be pressed with a uniform force over the entire lower end of the tire building drum 1 in the drum axial direction. In this way, when another unvulcanized material is already wrapped around the tire building drum 1, the adhesive force between this material and the band-shaped rubber material 7 is stronger than that between the elastic plate 26 of the first holding means 20. Since the adhesive force is stronger than that with the band-shaped rubber material 7, the band-shaped rubber material 7 separates from the elastic plate 26 and adheres to the unvulcanized material. Even if other unvulcanized materials are not wrapped around the tire building drum 1, the band-shaped rubber material 7 can be formed by making the entire surface of the tire building drum 1, or a portion thereof, smoother than the surface of the elastic plate 26.
can be transferred from the elastic plate 26 to the molding drum 1. The state at this time is shown in FIG. 6b. Here, if the thickness of the band-shaped rubber material 7 is not uniform in the width direction, or if the band-shaped rubber material 7 is composed of several parts made of different materials, for example, a phenomenon generally called short side occurs. This is a phenomenon in which both ends of the band-shaped rubber material 7 in the width direction become shorter in the longitudinal direction than the central part.
This is one of the factors that makes it difficult to automate tire molding. However, the tip of the band-shaped rubber material 7 is held in the state in which it was cut by the first holding means 20 that extends in the width direction of the band-shaped rubber material 7 and has a length greater than the width of the band-shaped rubber material 7. Since the tire is brought into close contact with the tire molding drum 1, this short side will not occur. Then the second
At this stage, the tire building drum 1 begins to rotate. As a result, the band-shaped rubber material 7 is wound around the tire molding drum 1 while being subjected to tension by the brake roll 54. At this time, the first holding means 20 moves to the left in FIG. 6b at the same speed as the circumferential speed of the tire building drum 1, and as a result,
It will be in the state shown in the figure. The tire molding drum 1 continues to rotate in this state, for example, the tire molding drum 1
rotates 3/4 and when the band-shaped rubber material 7 is wrapped around a predetermined length, the rotation is temporarily stopped. During this stop period, the first holding means 20 is lowered, and then the second holding means 21
At the same time, it moves directly below the pressing plate 36 as shown in FIG. 6d. At this time, the cutter 37 is
It is located directly above the gap between the holding means 21 and the first holding means 20. Next, in the third step, as shown in FIG. 6e, both the first holding means 20 and the second holding means 21 rise, and the pressing plate 36 descends to press the band-shaped rubber material 7 against the elastic plates 26, 29. wear. As a result, the band-shaped rubber material 7 has elastic plates 26,
29 as described above, the first and second holding means 2
It is held at 0,21. Next, in the fourth stage,
After the pressing plate 36 is raised, the cutter 37 cuts the band-shaped rubber material 7 into the sixth position at the middle part of the elastic plates 26 and 29, that is, near the rear side of the second holding means 21.
The rear end of the band-shaped rubber material 7, which is cut as shown in FIG. This cutting position is set in advance so that the band-shaped rubber material 7 separated by cutting has a desired length, that is, a length slightly shorter than the circumferential length of one molding drum. In addition, one pressing plate 36
Instead of the first holding means 20 and the second holding means 2
It goes without saying that a pair of pressing plates may be provided for each of the elastic plates 26 and 29, and the band-shaped rubber material 7 may be cut with the cutter 37 while being pressed against the elastic plates 26 and 29. Next, in the fifth step, the tire building drum 1 starts rotating again and the remaining part of the band-shaped rubber material 7 is wrapped around the tire building drum 1. At this time, a control mechanism (not shown) controls the rotational speed of the tire building drum 1 and the second holding means 21 in the left direction in the figure so that the remaining portion of the band-shaped rubber material 7 that has not been wrapped yet receives tension. Movement speed is controlled. Next, in the sixth stage, when the second holding means 21 reaches the lower end of the tire building drum 1 as shown in Fig. 6g,
Air is introduced into the elastic tubular body 28 to inflate it. As a result, the rear end of the band-shaped rubber material 7 is transferred to the tire molding drum 1 and brought into close contact therewith. At this time, the front end and the rear end of the band-shaped rubber material 7 are butted against each other, so that they do not overlap or there is no excessive gap between them. When the wrapping of the band-shaped rubber material 7 is completed in this way, the second holding means is controlled so as to reach a predetermined position on the circumference of the tire-building drum 1. Even if the diameter of rubber band 1 changes somewhat depending on the thickness of the material already wrapped, the position at which the rear end of the rubber band material is attached will not change due to this change in diameter. Therefore, the leading end and the trailing end of the band-shaped rubber material 7 can always be matched accurately. next,
The second holding means 21 is moved to the left in the figure at a speed equal to the circumferential speed of the tire building drum 1 to the position shown in FIG. 6h. The first to sixth stages described above are one cycle of the winding operation, and by repeating this cycle thereafter, the band-shaped rubber material 7 can be repeatedly wound around the tire molding drum 1. 6th
In the figures a to h, the band-shaped rubber material 7 is rotated around the outer circumference of the tire molding drum 1 once.
It goes without saying that it may be wound in multiple rotations. In this embodiment, the tire molding drum 1 is rotated 3/4 and then stopped temporarily.
During this stop period, the band-shaped rubber material 7 was cut, but
In another embodiment, the first and second holding means 20,
21, if the pressing mechanism 30, cutting mechanism 31, etc. are mechanisms that move to the left in the figure at the same speed as the band-shaped rubber material 7, this stopping operation will be unnecessary.

As described above, according to the present invention, it is possible to wrap the rubber band around the tire molding drum while holding the leading and trailing ends of the rubber band in a cut state and applying tension, which was previously impossible. It is now possible to accurately wrap a band-shaped rubber material, which was thought to have relatively low rigidity, around a tire-building drum.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the present invention;
Fig. 2 is a side view thereof, Fig. 3 is a sectional view of the vicinity of the first holding means when the band-shaped rubber material is pressed onto the tire molding drum, Fig. 4 is a sectional view taken along the - arrow in Fig. 3, and Fig. 5 6 is a sectional view showing a state when the band-shaped rubber material is pressed against the first and second holding means by the pressing mechanism, and FIGS. 6a to 6h are explanatory diagrams for explaining the operation. DESCRIPTION OF SYMBOLS 1... Tire molding drum, 7... Band-shaped rubber material, 20... First holding means, 21... Second holding means, 22... First holding means moving mechanism, 23... Second holding means moving mechanism, 30...pressing mechanism, 31...
...cutting mechanism, 53...transport mechanism, 54...tension mechanism.

Claims (1)

[Scope of Claims] 1. The step of holding the tip of the band-shaped rubber material in the state in which the tip was cut by the first holding means and transferring it to a tire-building drum and press-bonding it; and 1. A step of separating the holding means, a step of rotating the tire building drum while applying tension to the band-shaped rubber material, and a step of wrapping the band-shaped rubber material around the tire-building drum by a predetermined length; holding the rubber material with the second holding means; cutting the band-shaped rubber material near the rear side of the portion held by the second holding means; and holding the rubber band-shaped material in a second state with the rear end remaining cut; holding the rubber band material by a second holding means, rotating the tire building drum while applying tension to the rubber band material by a second holding means, and wrapping the remaining rubber band material around the tire building drum; pressing the rear end of the rubber band material onto a forming drum;
A method for wrapping a band-shaped rubber material around a tire-forming drum, characterized in that the method comprises: 2. A tire building drum, a first holding means that holds the tip of the band-shaped rubber material in the state when the tip is cut, and a first holding means that holds the tip of the band-shaped rubber material are moved to the tire-building drum and the band-shaped rubber material is cut. a first holding means moving mechanism for separating the rubber material from the tire building drum after the rubber material is pressed onto the tire building drum; and a belt-shaped rubber material for rotating the tire building drum to wrap the rubber band material to a predetermined length around the tire building drum. a tension mechanism for applying tension to the tire forming drum; a second holding means for holding the band-shaped rubber material being wound around the tire-building drum; A cutting mechanism that converts the part held in the cut state by the means into a rear end of the rubber band material; and a second holding means that holds the rear end of the rubber band material while the tire molding drum is rotating. and a second holding means moving mechanism that presses the rear end of the band-shaped rubber material onto the tire-molding drum after wrapping the remaining band-shaped rubber material around the tire-molding drum by moving the rubber band-shaped material so as to generate tension on the tire-molding drum. A device that wraps rubber band material around a tire molding drum.