JPH07164558A - Winder for belt reinforcing cord of automobile tire - Google Patents

Abstract

PURPOSE:To eliminate peak torque by lessening dispersion in tension of a reinforcing cord by a method wherein a brake torque having principally rolling friction is given a brake roller of the reinforcing cord. CONSTITUTION:A reinforcing cord K is drawn out, and wound successively on a lower guide roller 32 of a brake device 30, a brake roller 47, an upper guide roller 33, a rear guide roller 27 of a tension detector 20, a tension detecting roller 25, and a front guide roller 23 in this order. Further, it is conducted to a belt forming roller 10 via a front guide roller 14, a channel guide 13, and a winding roller 12. A spur gear 36 is transferred to a setting position of an external thread part of a first outside ring by diving a stepping motor. When the belt forming drum 10 is driven and rotated in the arrow direction, the reinforcing cord K is wound on the belt forming drum at set tension. Simultaneously tension of the reinforcing cord K is continuously detected with the tension detector 20. When abnormal tension is generated, its winding is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap ply, which is used for manufacturing an automobile tire, by spirally winding a ribbon-shaped reinforcing cord formed by coating several cords with a rubber on a belt located inside a tread. The present invention relates to a molding device for molding.

[0002]

2. Description of the Related Art As a device for forming a cap ply by spirally winding a ribbon-shaped reinforcing cord formed by coating several cords with a rubber on a belt in the secondary molding of an automobile tire, On the front side of the belt forming drum that rotates around a horizontal axis, a slide base that moves parallel to the horizontal axis is provided, and a winding roller and a reinforcement cord for guiding the above reinforcement cord to the drum are provided on the slide base. Tension detecting roller for detecting the tension of the cord, and a feed for eliminating the above tension difference by changing the feeding speed of the reinforcing cord according to the difference between the tension of the reinforcing cord detected by the tension detecting roller and the set tension. It is known that rollers are arranged in order from the forming drum side to the reinforcing cord supply side (see Japanese Patent Laid-Open No. 4-320832).

On the other hand, when the reinforcing cord is wound, the winding tension is controlled to increase the winding tension at the shoulder side end portion rather than the widthwise central portion of the belt (see FIG. 3).
It is known that the separation at the belt end portion of the tire is prevented thereby and the high speed durability is improved. For example, in Japanese Patent Laid-Open No. 63-264332, a brake roller provided with an electromagnetic brake is provided on the supply side of a winding guide traversing in front of a forming drum, and the above reinforcing cord is wound around the brake roller. The tension and winding position of the reinforcing cord are detected while supplying them to the guide, and the detected tension is fed back to the adjuster and compared with the set tension, and the rotation torque of the brake roller is controlled so that the tension difference is eliminated. However, there is disclosed a device in which the winding tension of the reinforcing cord is made larger at the end portion than at the central portion.

[0004]

The conventional device detects the tension of the reinforcing cord and feeds back the tension to change the rotational speed of the feed roller or the torque of the brake roller, thereby controlling the tension. When the cord is wound at a relatively low speed, it can be controlled by following the fluctuation of tension. However, from the viewpoint of productivity, when the winding speed of the reinforcing cord is set to a high speed of 100 m / min or more, it follows. There was a case where a delay was caused and tension unevenness expanded.

Further, in the conventional device, the tension is controlled by the sliding frictional force acting on the rotating system of the feed roller or the brake roller. A large torque of 5 to 10 times (peak torque) works, and the large tension of the reinforcing cord based on the peak torque is not relaxed until feedback works. And since a load cell is used for tension detection, if a load cell that can withstand the above-mentioned large tension is used, the accuracy will be rough and it will not be possible to accurately measure the tension near the target tension during operation. The variation in tension was large.

According to the present invention, the brake torque of the reinforcing cord is mainly applied to the friction roller to reduce the variation in the tension of the reinforcing cord and to eliminate the peak torque.

[0007]

SUMMARY OF THE INVENTION According to the present invention, a bearing for rotatably supporting a support shaft of a brake roller for setting a tension of a reinforcing cord is cantilevered on the slide base. A ring and an inner ring supported inside the ring via a rolling bearing, and the inner ring is the first ring.
A cone-shaped portion formed on the outer surface of the portion protruding from the free end of the outer ring and a cone-shaped portion of the second outer ring that surrounds the cone-shaped portion of the inner ring and is located outside the free end of the first outer ring. A large number of rollers inclined with a predetermined spiral angle are arranged between the portions and the portion along the circumferential line of the cone-shaped portion, and a male screw portion provided on the outer surface of the first outer ring is driven by a motor. A belt for an automobile tire, characterized in that a female screw portion at the center of a spur gear that rotates by means of a screw is screwed, and a compression spring is interposed between this spur gear and a flange projecting on the outer periphery of the second outer ring. It is a reinforced cord winding device.

[0008]

When the spur gear is rotated by a motor and is advanced toward the flange along the male screw part, the spur gear, the compression spring, the flange and the second outer ring are used to move the inside of the second outer ring. Roller pushes the inner ring from the small diameter side to the large diameter side, and the pressing force changes according to the rotation amount of the spur gear. Then, the rotation of the brake roller is locked when the roller in contact with the cone-shaped portion moves to the large diameter side of the cone-shaped portion, and in the opposite direction, the above-mentioned roller moves to the small diameter side to allow free rotation. Although it is about to be ready, a frictional force is generated in accordance with the pressure received from the second outer ring, and thereby a brake torque is generated in accordance with the position of the spur gear.

Therefore, a predetermined tension can be stably applied to the reinforcing cord by winding the reinforcing cord around the brake roller for operation. Moreover, since the above-mentioned brake torque is absorbed by the rolling friction between the inner and outer cone-shaped portions and a large number of rollers, no peak torque is generated at the start of driving. Further, when the motor is rotated according to a preset program and the spur gear is rotated by the motor, the tension of the reinforcing cord can be changed according to the program.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 10 is a belt forming drum, and a slide base 11 which is movable in the width direction of the belt forming drum 10 (a direction perpendicular to the plane of the drawing) is provided in front of it (to the right in the figure). On the slide base 11, the reinforcing cord K is provided from the end portion on the drum 10 side on the left side of the drawing toward the reinforcing cord supply side on the right side.
The winding roller 12, the groove guide 13 for guiding the reinforcing cord K, the guide roller 14, the tension detecting device 20 for detecting the tension of the reinforcing cord K, and the brake device 30 for controlling the tension of the reinforcing cord K are provided. The reinforcing cords K are provided in this order, and the reinforcement cord K, the tension detecting device 20, the guide roller 14, the groove guide 13, and the winding roller 12 are provided.
The reinforcing cord K is spirally wound around the drum 10 by being sent to the drum 10 via the slide table 11 and moving in the width direction during the movement.

The tension detecting device 20 comprises a detection base 21 fixed to the slide base 11, a front guide roller 23 mounted on the detection base 21 via a front bracket 22,
The tension detection roller 25 is mounted via the intermediate bracket 24, the rear guide roller 27 is mounted via the rear bracket 26, and the load cell 28 attached to the tension detection roller 25. The reinforcing cord K is passed through the lower surface of the detection roller 25 and the upper surface of the front guide roller 23 in this order, the tension of the reinforcing cord K detected by the load cell 28 is displayed on a display device (not shown), and the detected tension is set. The value is compared with the value, and when the abnormal value is detected, the winding of the reinforcing cord K is stopped.

A vertical guide roller bracket 31 and a brake roller bracket 34 forming a part of the brake device 30 are provided on the reinforcing cord supply side of the tension detecting device 20.
Is fixed, and guide rollers 32 and 33 with groove guides are rotatably attached to the lower and upper portions of the guide roller bracket 31, respectively.

The brake roller bracket 34 described above is
As shown in FIG. 2, it comprises a horizontal portion 34a, a vertical portion 34b and a reinforcing fin portion 34c, and a lower hole 34d having a relatively large diameter and an upper hole 34e having a relatively small diameter are formed in the vertical portion 34b. Has been. And this vertical portion 34b
The first outer ring 35 surrounds the lower hole 34d at the bottom of the
Is fixed, and the female screw portion on the inner surface of the spur gear 36 is screwed into the male screw portion 35a carved on the outer surface thereof. On the other hand, the vertical portion 34
A stepping motor 37 is fixed to the upper part of b so as to close the upper hole 34e, and a motor gear 38 is fixed to a motor shaft 37a passing through the center of the upper hole 34e.
8 is meshed with the spur gear 36, and the spur gear 36 is rotated via the motor gear 38 by the driving of the stepping motor 37, and the male screw portion 35a of the first outer ring 35 is rotated.
Move back and forth along the axis.

An inner ring 40 is rotatably attached to the inner surface of the first outer ring 35 via a spherical bearing 39. The inner ring 40 is formed long so that one end thereof projects axially outward from the free end of the first outer ring 35, and the cone-shaped portion 40a has a large diameter on the projecting end side on the outer surface of the projecting portion. Is formed in. Also, the first
A ball spline 41 is provided outside the free end of the outer ring 35.
A second outer ring 42 that is in contact with the second outer ring 42 via a cone-shaped portion 42a formed on the inner surface of the second outer ring 42 corresponding to the cone-shaped portion 40a of the inner ring 40.
And a plurality of rollers 43 held by a retainer (not shown) between the inner ring 40 and the cone-shaped portion 40a of the inner ring 40 are inclined at a predetermined helix angle, and the cone-shaped portions 40a, 42a A type of conical roller bearing (provided that the rollers are tilted), which are arranged at equal intervals along the circumferential line
Is formed.

A compression washer 45 in the form of a spring washer is interposed between the spur gear 36 and the flange 44 fitted on the outer surface of the second outer ring 42. Also,
A brake roller 47 is fixed to the inner surface of the inner ring 40 via a support shaft 46.

In the above structure, when the stepping motor 37 is driven and the spur gear 36 is rotated through the motor gear 38 to move the spur gear 36 to the free end side of the first outer ring 35, the compression spring 45 is generated. When compressed, the cone-shaped portion 42a of the second outer ring 42 presses the cone-shaped portion 40a of the inner ring 40 via the roller 43. At this time, in the example of FIG. 2, since the roller 43 is inclined along the spiral line in the left-hand screw direction, when the brake roller 47 is rotated in the arrow P direction, the roller 43 revolves in the arrow P direction. , Rotate in the left-hand screw direction. That is, since the rollers 43 roll to the smaller diameter side of the cone-shaped portions 40a and 42a and the roller 43 rotates while receiving the pressure from the second outer ring 42, a predetermined brake torque is generated. In contrast,
When it rotates in the opposite direction, it becomes locked.

Therefore, the reinforcing cord K is pulled out from the package (not shown) (see FIG. 1), the lower guide roller 32 of the brake device 30 and the brake roller 4 are provided.
7, the upper guide roller 33, the rear guide roller 27 of the tension detecting device 20, the tension detecting roller 25, the front guide roller 23, and the front guide roller 14,
The spur gear 36 is guided to the belt forming drum 10 via the groove-shaped guide 13 and the winding roller 12, and the spur gear 36 is driven by the stepping motor 37 to drive the male screw portion 35 of the first outer ring 35.
When the belt forming drum 10 is moved to the set position a and is rotated in the direction of arrow Q, the belt forming drum 10 is moved.
The reinforcement cord K is wound around the set tension, and at the same time, the tension of the reinforcement cord K is continuously detected by the tension detector 20.
If abnormal tension occurs, winding will stop.

In the above embodiment, as shown in FIG. 3, when the tension at the left and right ends of the sticking position on the drum, that is, at the positions corresponding to the shoulder portion of the automobile tire is made larger than the central portion C, it is desirable. Is stored in the control device, the stepping motor 37 is driven in accordance with this tension pattern to move the spur gear 36 back and forth, and the compression degree of the compression spring 45 is controlled, so that the reinforcing cord K is formed in a desired tension pattern. Can be wrapped. Feedback control can also be performed using the tension detected by the tension detector 20.

[0019]

As described above, according to the present invention, the bearing for supporting the support shaft of the brake roller is the cantilevered first outer ring and the inner ring supported inside the first outer ring via the rolling bearing. A predetermined hang between the cone-shaped portion formed on the outer surface of the end of the inner ring and the cone-shaped portion of the inner surface of the second outer ring that surrounds the cone-shaped portion and is located outside the end of the first outer ring. A large number of rollers inclined at a winding angle are arranged along the circumferential line of the cone-shaped portion, and the female screw portion at the center of the spur gear is screwed to the male screw portion on the outer surface of the first outer ring. (2) A spur gear is rotated by a motor by interposing a compression spring between it and a flange on the outer circumference of the outer ring, and the spur gear is screwed to the male screw portion of the first outer ring that supports the brake roller. Is driven by a motor Te moved back and forth with the spur gear in the axial direction,
As a result, the rotation torque of the brake roller, that is, the brake torque is adjusted, so that the magnitude of the brake torque can be set steplessly. Since the above-mentioned brake torque is generated mainly by the rolling friction of the roller interposed between the cone-shaped portion of the inner ring and the cone-shaped portion of the second outer ring, there is no peak torque at the start of driving, A predetermined tension can be stably applied to the reinforcing cord. Further, when the motor is rotated according to a preset program and the spur gear is rotated by the motor, the tension of the reinforcing cord can be changed according to the program.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment.

FIG. 2 is a vertical sectional view of a brake device.

FIG. 3 is a graph showing a tension pattern of a reinforcing cord.

[Explanation of symbols]

 K: Reinforcement cord 10: Belt forming drum 11: Sliding table 12: Winding roller 20: Tension detecting device 23, 27: Guide roller 25: Tension detecting roller 28: Load cell 30: Brake device 32, 33: Guide roller 35: First outer ring 35a: Male screw part 36: Spur gear 37: Stepping motor 38: Motor gear 39: Rolling bearing (ball bearing) 40: Inner ring 40a, 42a: Cone-shaped part 42: Second outer ring 43: Roller 44 : Flange 45: Compression spring 46: Support shaft 47: Brake roller

Claims (1)

[Claims] 1. A belt reinforcing cord winding device for an automobile tire, wherein a reinforcing cord supplied to a belt forming drum is wound around a brake roller to give a predetermined tension to the reinforcing cord. A bearing for supporting the first outer ring is formed of a cantilevered first outer ring and an inner ring supported on the inner side thereof via a rolling bearing, and the inner ring projects from the free end of the first outer ring. A predetermined spiral between the cone-shaped portion formed on the outer surface of the inner ring and the cone-shaped portion of the inner surface of the second outer ring that surrounds the cone-shaped portion of the inner ring and is located outside the free end of the first outer ring. A large number of rollers inclined at an angle are arranged along the circumferential line of the cone-shaped portion,
A female thread at the center of a spur gear that is driven by a motor is screwed onto a male thread provided on the outer surface of the outer ring, and between the spur gear and a flange projecting on the outer circumference of the second outer ring. A belt-reinforcing cord winding device for an automobile tire, characterized in that a compression spring is interposed.