JPH06286022A - Apparatus for formation of bead core - Google Patents

Abstract

PURPOSE:To prevent a bead wire from becoming disorderly in winding by a method wherein a second servomotor that makes cross-feed for a holder in every cycle of starting and stopping in a spiral pitch is provided and the maximum revolution speed in every cycle is varied in accordance with the revolution speed of a first servomotor. CONSTITUTION:The diameter of a bead wire, the outer diameter of a winding former, the number of wires arranged in the innermost and the outermost positions and the maximum number of wires are inputted, and the total amount of revolution of a motor is calculated therefrom, and a first servomotor is operated, based on an operational characteristics I having an acceleration area Y1, a constant speed area Y2 and a deceleration area Y3. As a mark is detected in advance of completion of one winding for the bead wire, the maximum revolution speed for a second servomotor is set in proportion to the revolution speed of the former when it passes the mark, and the second servomotor is operated, based on operational speed characteristics J1-J18. Each of internal areas S of the characteristics J1-J18 indicates the distance of cross moving, and the areas SA in the characteristics J1-2, J4-6, J8-11, J13-15 and J17-18 are equal to the crossfeed pitch P1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bead core forming apparatus capable of precisely winding a bead wire in a spiral without winding disorder and forming a high quality bead core.

[0002]

2. Description of the Related Art In a pneumatic tire T, for example, as shown in FIG. 8, a bead portion a mounted on a rim is made of rubber in order to lock a folded portion of a carcass b and maintain tire rigidity. A bead core C in which a single drawn bead wire W made of steel is spirally wound in multiple layers is embedded.

Further, as shown in FIGS. 9 and 10, the formation of such a bead core C is usually performed by using a disk-shaped former f having a groove g on the outer peripheral surface thereof, and a bead wire at the groove bottom of the former f. The bead wire W starts winding along one side edge e of the groove bottom by fixing and winding the winding start portion W1 of W, and the bead wire W is equal to the diameter D thereof near the end of one rotation of the former. 1 pitch P
It is wound in a spiral by laterally moving in the direction of the rotation axis by a distance of 1 (distance of 1/2 pitch P2 when shifting to the next layer), and repeating this lateral movement every rotation of the former f.

For this lateral movement, a step motor which operates at the specified fixed position K on the former is conventionally used.

[0005]

However, the former f is repeatedly started and stopped each time the bead core C is formed, so that the drive motor thereof gradually increases in rotation speed from the start, as shown in FIG. The operation is performed in an acceleration range Y1, a constant speed range Y2 that rotates at a constant speed, and a deceleration range Y3 that decelerates toward a stop.

On the other hand, since the step motor moves laterally by the distance of the constant pitch P1 as described above, the operating speed characteristic j of one cycle from start to stop is the operating speed characteristic i of the driving motor. It was assumed to be constant for each operation regardless of.

As a result, as shown in FIG. 10, as the rotational speed of the driving motor increases, the lateral movement completion position H moves to the winding start portion W1 side of the bead wire, and adjacent bead wires W move vertically in the acceleration region. The bead wire W is distorted around the bead wire W such as partially overlapping with, and the rigidity and strength of the bead core are impaired and the dimensional accuracy is lowered, and the product quality is drastically reduced.

According to the present invention, the lateral movement is driven by a second servo motor, and the maximum rotation speed of the servo motor for each cycle is changed in proportion to the rotation speed of the first servo motor for driving the former. Based on this, it is an object of the present invention to provide a bead core forming device capable of solving the above problems.

[0009]

In order to achieve the above object, a bead core forming apparatus of the present invention has an outer peripheral surface around which a bead wire for forming a bead core of a tire is spirally wound, and is activated every time one bead core is formed. , A winding former that is rotated by a first servomotor that repeats stopping, and a transverse feed tool that has a holding piece that spirally winds the bead wire by holding the bead wire and enabling lateral movement in the direction of the rotation axis of the former. A bead core forming device comprising: a second servo motor that laterally feeds the holding piece for each spiral pitch for each cycle of start and stop of the lateral feed tool; The control device changes the maximum rotation speed for each cycle in proportion to the rotation speed of the first servomotor.

[0010]

[Operation] 1 of the second servomotor M2 for laterally feeding the holding piece
The maximum rotation speed for each cycle is changed in proportion to the rotation speed of the first servomotor M1 at that time. As a result, the operation time of each cycle of the second servo motor M2 also changes in accordance with the maximum rotation speed, and the lateral movement completion position H of the holding piece becomes substantially constant on the former, so that there is no winding disturbance. A good spiral winding can be formed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the figure, a bead core forming device 1 includes a winding former 2 having an outer peripheral surface around which a bead wire W for forming a bead core C of a tire T is spirally wound, and a holding piece which holds the bead wire W and moves laterally in a rotation axis direction. Three
And a transverse feed tool 4 having.

In this embodiment, the winding former 2 is, for example, a disc body having a concave groove G for winding the wire W on its outer peripheral surface as shown in FIGS.
It is composed of fan-shaped divided segments 5 that are equally divided into two parts, and each is rotatably supported by a support shaft 6 so as to be expandable and contractable.

As shown in FIG. 2, the support shaft 6 is a rotary cylinder 1 rotatably supported by a side plate 9A of a frame 9.
0, and a center shaft 11 that can be moved back and forth in the direction of the rotation axis by being loosely inserted in the center hole of the rotation cylinder 10. The center shaft 11 is provided with a locking pin or the like.
It is locked so as to be able to rotate integrally with.

A first servomotor M1 attached to the frame 9 is connected to the rotary cylinder 10 via a drive transmission means 14 such as a pulley 14A and a drive belt 14B. The first servomotor M1 is connected to the rotary cylinder 10. Each time the bead core C is formed, the rotation is started and stopped repeatedly. In addition, the rotary cylinder 10
The housing 12 is integrally fixed at its front end and has a flange-shaped flange portion 12A that is oriented at right angles to the rotation axis, and each of the divided segments 5 is rotated in the rotation axis direction by a guide means 13 provided at the front end of the flange portion 12A. It is held immovably and slidably in the radial direction in a plane perpendicular to the rotation axis.

The rear end of the center shaft 11 is connected to the rod end of a cylinder 16 for driving the center shaft which is attached to the frame 9.
Further, the divided segments 5 and the front end of the center shaft 11 are connected to each other via a link body 15, and by the forward / backward movement of the center shaft 11 by the sillings 16, the respective divided segments 5 slide equally in the radial direction, and the outer peripheral surface of the winding former 2 is moved. Expand and contract the diameter.

The bead wire W wound in the concave groove G provided on the outer peripheral surface is rubberized through a rubber extruder (not shown), and then, as shown in FIG.
And is supplied to the winding former 2.

The lateral feed tool 4 has a holding piece 3 that holds the bead wire W and moves laterally in the direction of the rotation axis.
Is supported by a horizontal moving base 20 that moves laterally in the direction of the rotation axis, and the horizontal moving base 20 is supported by a travel base 21 that travels substantially horizontally in a plane perpendicular to the rotation axis.

The traveling platform 21 includes a side plate 22 of the frame.
A block 22 is slidably supported by a substantially horizontal guide shaft 23 extending between A and 22A, and on the upper surface of the traveling table 21, for example, two cylinders in which rods 24A and 24B are fixed to the side plate 22A, for example. The drive tool 25, which is
Further, as shown in FIG. 3, the traveling platform 21 has a pair of leg portions 21A on the lower surface thereof, and a guide piece 26 extending in the rotation axis direction is fixed to the lower end of the leg portions 21A.

The lateral moving table 20 has the guide piece 26.
The horizontal moving table 20
A rail piece 27 for guiding the guide along the guide piece 26 is provided. Further, the lateral moving table 20 includes the traveling table 21 and the lateral moving tool 2
9, the lateral movement tool 29 is connected to the traveling table 2
1 Second servo motor M2 flanged to the bottom surface
And a screw shaft 30 having one end concentrically connected to the output shaft of the servomotor M2 and the other end extending in the rotation axis direction being rotatably supported by a bearing body (not shown) of the traveling base 21, and the lateral movement. A screwing portion 32 that is raised on the upper surface of the base 20 and that is screwed with the screw shaft 30 is provided.

The holding piece 3, the wire gripper 33, and the wire cutter 34 are arranged on the lateral moving table 20 from the upstream side to the downstream side of the supply of the bead wire W, respectively.

The holding piece 3 is, in this example, the horizontal moving table 2
0 is provided with a frame body 36 to which the upper end of the wire supply upstream side is pivotally attached at a pivotal attachment portion 35 and a guide roller 37 of a slightly larger diameter pivotally supported between the side plates of the frame body 36. Auxiliary guide rollers 38, 39 having a small diameter are further provided upstream of the guide roller 37. Each guide roller 3
7, 38 and 39 are the bead wires W on their circumferential surfaces, respectively.
Each of the holding grooves 4 has concave holding grooves 40 ...
The bead wire W can be supplied to the winding former 2 along the one plane by passing the zero equator on the one plane perpendicular to the rotation axis.

Further, the holding piece 3 is provided at the upper end of the frame body 36 on the downstream side, and a schilling 41 fixed to the lateral moving table 20.
The rod is pivotally supported, and the extension of the rod of the cylinder 41 allows the holding piece 3 to tilt downward about the pivotal attachment portion 35.

The wire gripping tool 33 is a clamp tool having a well-known structure for holding the winding start portion W1 when the wire is supplied, and the wire gripping tool 33 and the wire cutter 34 are lifted up and down of a cylinder or the like to be mounted on the lateral moving table 20. It is attached to a lift table 43 which is supported by a tool 42 so as to be vertically movable.

The transverse feed device 4 thus constructed is
The winding start portion W1 of the bead wire W grasped by the wire grasping tool 33 is moved to a position above the wire fixing position R of the winding former 2 waiting by the traveling of the traveling table 21, and the grasping tool 33 is released to start winding. Department W1
Is fixed to the groove bottom side edge E on one side of the concave groove G. Then, the winding former 2 is rotated by the activation of the first servomotor M1, while the bead wire W is pressed into the holding groove 40 by the tilting of the holding piece 3 by the cylinder 41.
Ensure tensioning and holding of the bead wire W. Further, the lateral feed tool 4 intermittently operates the second servo motor M2 every one rotation of the winding former 1, and this servo motor M2 is operated.
The holding piece 3 laterally feeds the bead wire W at each spiral pitch every cycle of starting and stopping.

In the present invention, the first servomotor M1 and the second servomotor M2 are controlled by the controller 7 in conjunction with each other. In this example, the control device 7 is, for example, a bead core C to be formed which is input by an external setting device 44 such as an operation panel as shown in FIG. 4.
A data input section 7A for accommodating the shape data and the like, and a position sensor section 7B for inputting and outputting a signal of the sensor SW2 for detecting the passage of the marker K provided on the winding former 2, for example.
The speed sensor unit 7C that detects the former rotation speed when the marker K passes and inputs / outputs the signal, and the first by receiving signals from the data input unit 7A, the position sensor unit 7B, and the speed sensor unit 7C. 7D for outputting operation commands such as start, stop, rotation speed and rotation time to the second servo motor M2 and outputting operation commands such as start, stop, rotation speed and rotation direction to the second servo motor M2. And with. The case where the bead core C having a hexagonal cross section shown in FIG. 9 is formed will be described below.

That is, the external setter 44 inputs the diameter D of the bead wire W, that is, the spiral transverse feed pitch P, the outer peripheral length of the winding former 2, the innermost wire arrangement number, the outermost wire arrangement number, and the maximum wire arrangement number. By doing so, the computing unit 7D calculates the total number of rotations of the motor and also shows it in FIG. The first servomotor M1 is operated based on the operating speed characteristic I having the acceleration range Y1, the constant speed range Y2, and the deceleration range Y3.

Further, the position sensor section 7B for detecting the mark K prior to the completion of winding the bead wire W around one round instructs the start of the second servomotor M2 via the computing section 7D.
The arithmetic unit 7D, which receives the signal from the speed sensor 7C at the time of starting, sets a value proportional to the rotational speed v of the former when passing the marker K as the maximum rotational speed V of the second servo motor M2. The second servomotor M2 is operated based on the operating speed characteristics J1 to J18.

In each of the characteristics J1 to J18, the internal area S indicates the lateral movement distance, and the characteristics J1 to J18.
J2, J4 to J6, J8 to J11, J13 to J15, J
The area SA of 17 to J18 is equal to the lateral feed pitch P1, and therefore the operation time t of the second servomotor M2 also changes according to each maximum rotation speed V. Characteristics J3, J
7, J12, and J16 are when the winding of the bead wire W1 moves to the next outer layer, and therefore the area SB
Is 1/2 pitch P which is 1/2 of the transverse feed pitch P1
It is equal to 2, so the maximum rotation speed at this time is proportional to 1/2 of the rotation speed of the former.

The characteristics J4 to J7 and J12 to J1 shown in the figure
In Fig. 5, the speed (-) indicates that the motor rotation direction is opposite to the speed (+). The operating speed characteristic J for one cycle in which the maximum rotation speed V is set is
In addition to a substantially isosceles triangular shape in which the maximum rotation speed V is set approximately at the center of the stop and acceleration regions and deceleration regions are provided on both sides thereof, the maximum rotation speed V is deviated to the start side or the stop side, or FIG.
As shown in (a) and (b), there are various operating speed characteristics such as a substantially trapezoidal shape in which a constant speed area is provided at the maximum rotation speed V, and an acceleration area and a deceleration area that are curved. Servo motor M
2 can be activated. However, since the operation time of the second servomotor M2 is short, it is preferable to make it into an approximately isosceles triangular shape.

Since the maximum rotation speed V of the second servo motor M2 for each cycle is changed in proportion to the rotation speed of the former, that is, the rotation speed of the first servo motor M1 in this way, it is shown in FIG. As described above, even when the rotation speed of the first servomotor M1 changes, the spiral winding can be accurately formed without causing winding disorder in the bead wire W.

[0031]

As described above, in the bead core forming apparatus of the present invention, since the rotation speeds of the first servo motor and the second servo motor are linked by the control device, the winding disturbance of the bead wire W can be prevented. It can form quality bead cores.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a winding former.

FIG. 3 is a perspective view showing a holding piece.

FIG. 4 is a diagram illustrating a control device.

FIG. 5 is a diagram showing an operating speed characteristic of a motor.

FIG. 6A and FIG. 6B are diagrams showing operating speed characteristics of the second servomotor.

FIG. 7 is a diagram showing the effect of the present invention.

FIG. 8 is a cross-sectional view showing a tire.

FIG. 9 is an enlarged sectional view showing a bead core.

FIG. 10 is a diagram illustrating a conventional technique.

FIG. 11 is a diagram illustrating a conventional technique.

[Explanation of symbols]

 2 Winding former 3 Holding piece 4 Traverse tool 7 Controller C Bead core M1 First servo motor M2 Second servo motor T Tire W Bead wire

Claims (1)

[Claims] 1. A winding former which has an outer peripheral surface for spirally winding a bead wire for forming a bead core of a tire and which is rotated by a first servomotor which repeats starting and stopping for each formation of one bead core, and the bead wire. A bead core forming device comprising: a lateral feed tool having a holding piece for spirally winding a bead wire by holding the lateral wire in a direction of a rotation axis of the former, the starting and stopping of the lateral feed tool. A second servomotor that laterally feeds the holding piece for each cycle is provided for each cycle, and the maximum rotation speed of each cycle of the second servomotor is proportional to the rotation speed of the first servomotor. A bead core forming device characterized in that it has a control device for changing it.