JPH0397533A - Stitcher wheel for tire molding machine - Google Patents

Abstract

PURPOSE:To dispense with stage replacement by performing temporay pressure bonding by allowing a cylindrical stitcher wheel to follow tire constitutional materials having various shapes by integrally forming at least one or more V-shape protruding parts having the same height whose top parts are positioned in the of rotation on the outer peripheral surface of the stitcher wheel so as to be symmetric left and right in the pheripheral direction of the wheel. CONSTITUTION:A stitcher apparatus 2 is arranged on a base 3 in a slidable manner through a support table 4 and constituted so as to be capable of advancing and receding with respect to a belt molding drum 1. A slide cylinder 8 is mounted on the support table 4 through a support frame 5 and connected to the arm 7 arranged in front of said cylinder 6. A cylindrical stitcher wheel 8 is mounted to the leading end of the arm 7 in a freely rotatable manner and integrally molded from a rubbery elastomer such as urethane rubber and at least one or more V-shape protruding parts 10, whose top parts 10a are positioned in the direction of rotation, having the same height are integrally formed the outer peripheral surface 9 of the stitcher wheel 8 so as to be symmetric left and right in the peripheral direction of the wheel 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a stitcher wheel for a tire molding machine, and more specifically to an improvement in a stitcher wheel for temporarily compressing a cap tread, etc. on a belt or shaped drum. It is related to. [Prior Art] Conventionally, tire structural members such as a cap tread wrapped around a belt forming drum are crimped by a stitcher wheel provided on a stitcher device in order to stabilize the dimensions in the circumferential direction and the width direction. It is being done to By the way, various shapes and structures have been proposed for the stitcher wheels of conventional stitcher devices. For example, the surface of the cap tread may be formed into a drum shape so that it can be crimped, or a plurality of disc-shaped rolls may be arranged in a rotatable manner (Japanese Patent Application Laid-open No. 134731/1983), or a plurality of rolls may be arranged to allow rotation. The device is energized by a constant elastic force via a spring, and is crimped while following the shape of the cap tread.
Publication No. 31). [Problems to be Solved by the Invention] However, the drum-shaped stitcher wheel cannot accommodate cap treads of various shapes. Therefore, when crimping cap treads of different shapes, The stitcher wheel has to be replaced with a stitcher wheel that corresponds to the shape, and there is a problem that only the center part of the cap tread can be crimped. The stitcher wheel of the type in which the belt is tracked takes a long time to form the belt, so productivity cannot be improved, and the structure is complicated, resulting in an expensive device.

[Purpose of the invention]

This invention was devised by paying attention to such conventional problems, and since it is possible to temporarily press-bond tire constituent materials of various shapes, there is no need to change the setup.
Another object of the present invention is to provide a stitcher wheel for a tire shaping machine that can also be used for belt crimping, has a simple structure, and can be manufactured at low cost.

[Means to solve the problem]

In order to achieve the above object, the present invention has at least one V-shape of the same height on the outer peripheral surface of a cylindrical stitcher wheel, which is symmetrical in the circumferential direction and whose apex is located in the direction of rotation. The gist is that the shaped protrusions are integrally formed.

[Action of the invention]

The present invention is constructed as described above, and the tire construction material attached to the belt forming drum is rotated while the forming drum is rotated to form at least one or more V-shaped grooves of the same height in the circumferential direction.
By crimping at the letter-shaped convex portions, it is possible to crimp almost the entire surface of the tire structure material.

[Embodiments of the invention]

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

Fig. 1 shows a front view of a stitcher device for a tire forming machine embodying the present invention, and Fig. 2 shows a side view of the stitcher device, where l is a belt or a drum in the second stage forming machine, and 2 is a side view of the stitcher device. A stitcher device installed near a belt or shaped drum 1 is shown, and this stitcher device 2 is attached to a base 3.
It is slidably installed on the top via a support stand 4, and is configured to move forward and backward relative to the belt or shaped drum l.

A swing cylinder 6 is mounted on the support base 4 via a support frame 5, and the swing cylinder 6 is connected to an arm 7 installed in front of the swing cylinder 6.

A cylindrical stitcher wheel 8 according to the present invention is rotatably attached to the tip of the arm 7, and the stitcher wheel 8 is integrally molded from a rubber-like elastic material such as urethane rubber. As shown in FIG. 4, at least one V-shaped convexity of the same height is formed on the outer circumferential surface 9, which is symmetrical in the circumferential direction and whose apex 10a is located in the direction of rotation (in the direction of the arrow). The portion 10 is integrally formed.

In this embodiment, the V-shaped convex portions 10 are formed at eight locations on the circumference, but the number is not limited. For example, one V-shaped convex portion 10 is formed continuously in the circumferential direction. It may be formed into

In addition, the top portion 10a serving as the starting end of each adjacent V-shaped convex portion 10
The hem portion 10b serving as the terminal end is arranged so that a slight gap h is formed as shown in FIG. As shown in the figure, it is formed in a semicircular arc shape, and a sufficient air passage between the braais is ensured along the V-shaped convex portion 10.

Since the stitcher wheel 8 according to the present invention is configured as described above, when the tire structure material W such as a cap tread attached to the belt forming drum 1 is to be temporarily pressed, the stitcher wheel 8 according to the present invention is Tire construction material W
Then, the stitcher wheel 8 of the stitcher device 2 is brought into pressure contact, and the tire constituent material W is stitched while the belt forming drum I is rotated.

In this case, first, as shown in FIG.
In the central recess Wa of
0a comes into contact first, and then the side wb side of the surface of the tire structural material W contacts and presses toward the hem 10b, which is the end of the continuous V-shaped protrusion 10. In this way, the outer circumferential surface of the stitcher wheel 8 does not come into contact with the surface of the tire component W at the same time, but the ■-shaped convex portions 10 come into contact sequentially, so that it can be applied to tire components W of various shapes. This makes it possible to handle the problem and ensure reliable crimping.

After the preliminary crimping is completed in this manner, the final crimping is performed in the same manner using the same stitcher wheel 8.

Therefore, even when compressing tire constituent materials W having different shapes, there is no need to replace the stitcher wheel 8 each time, and setup change work can also be omitted.

〔Effect of the invention〕

As described above, the present invention provides at least one V-shaped convex portion having the same height on the outer circumferential surface of the cylindrical stitcher wheel, which is symmetrical in the circumferential direction, and whose apex is located in the rotation direction. Since it is integrally formed, it can be temporarily crimped to follow tire structures and materials of various shapes, so there is no need to change setups, and it is economical because it can be used both for the temporary crimping of the belt and the final stage crimping. In addition to being highly accurate, it is possible to perform pasting work with high precision, and since the structure is simpler than conventional devices, it has the effect of being able to be manufactured at low cost.

[Brief explanation of drawings]

Fig. 1 is a front view of a stitcher device for a tire molding machine embodying the present invention, Fig. 2 is a side view of the stitcher device, Fig. 3 is a perspective view of the stitcher wheel, and Fig. 4 is a side view of the stitcher wheel. 5 is an enlarged front view showing a part of the outer circumferential surface of the stitcher wheel, and FIG. 6 is an explanatory diagram showing the process of compressing tire constituent materials by the stitcher wheel. ■... Belt forming drum, 2... Stitcher device, 7... Arm, 8... Stitcher wheel, 9
... Outer peripheral surface, lO ... V-shaped convex portion, 10a ... Top portion, 10b ... Hem portion, W ... Tire constituent material (cap tread). Figure 5 Figure 2 j 4

Claims (1)

[Claims] In a stitcher wheel for a tire forming machine comprising a cylindrical stitcher wheel installed to be movable forward and backward with respect to a belt forming drum, the outer peripheral surface of the cylindrical stitcher wheel is symmetrical in the circumferential direction,
A stitcher wheel for a tire molding machine, characterized in that at least one V-shaped convex portion of the same height is integrally formed with the top portion located in the rotation direction.