JP3216917B2 - Tire grinding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire grinding device for a tire uniformity machine or the like.

[0002]

2. Description of the Related Art For example, Japanese Patent Publication No. 46-31599, Japanese Patent Application Laid-Open No. 60-147634,
Japanese Unexamined Patent Application Publication No. 1-221231 is known (hereinafter referred to as Conventional Technique I). When grinding the outer peripheral surface of the tire with a grindstone, this conventional device controls the depth of cut of the grindstone, so that a contact provided in a fixed positional relationship with the grindstone is brought into contact with the outer peripheral surface of the tire, and the grindstone is grounded. The origin of the depth of cut was set.

[0003] The conventional grinding stone has a cylindrical shape or a disk shape, and the contact has a ball point contacting the tire at a point or a narrow paddle shape contacting the tire at a line. . In the prior art, for example, when a cylindrical grindstone is used, the outer peripheral surface of a tire having a curvature and the outer peripheral surface of a cylindrical grindstone have an inclination angle (the grinding wheel axis and the tire axis are in an intersecting state. ), When the inclination angle is changed or the position of the grindstone is changed in the axial direction of the tire, the contact point of the grindstone is slightly shifted in the axial direction.

On the other hand, the contact is mounted so as to maintain a constant relative position with respect to the grinding stone, and is formed in a ball point or paddle shape. Therefore, when the position of the grinding stone changes, the contact between the contact and the tire is changed. There has been a problem that a deviation occurs between the contact position and the contact position between the grindstone and the tire, and unless the correction is performed, it is impossible to accurately control the cutting depth. Also, in large tires for trucks and buses, some grooves are large due to the block pattern of the tread portion, and in the case of a point contact type contact, the contact falls into the groove, causing fluttering of the contact. Correspondence of grooving software of sensor output waveform in the case of sensor breakage including skim or skim condition ("skim" means taking the origin of contact between grindstone and tire in controlling the amount of cutting of grindstone) There was a problem that it was necessary.

In order to solve such a problem, a technique described in Japanese Patent Publication No. 63-34819 has already been proposed (hereinafter referred to as Conventional Technique II). This prior art
II, `` The tire position detection head (contact) in the shape of a trapezoidal cylinder having a concave curved surface on the peripheral surface is provided facing the shoulder of the tire so that the position in the tire width direction can be adjusted freely, and the tire position is detected. A tire position detecting device for automatically moving the head toward and away from the tire and automatically detecting a forward distance of the tire position detecting head; and a grindstone having the same trapezoidal cylindrical shape as the tire position detecting head. A grinding device for automatically detecting the advance distance of the grindstone, wherein the grinding wheel is provided so as to be capable of adjusting the position of the grindstone in the width direction of the tire so as to be capable of adjusting the position in the width direction of the tire. The advance distance of the head and the advance distance of the whetstone were controlled to be substantially the same distance. "

[0006]

However, the above prior art
In II, the grinding wheel had a trapezoidal cylindrical shape with a concave curved surface on the peripheral surface, so the dressing of the grinding wheel peripheral surface (
Molding) is difficult, and every time the shape or type of the tire changes, a grindstone having a shape suitable for the shape of the peripheral surface of the tire must be prepared, and the processing cost is high.

In the prior art II, the tire position detecting head (contact) has a trapezoidal cylindrical shape.
Although the drop of the tire tread into the groove is reduced as compared with the ball point-shaped one, the problem that the large groove of the large truck tire still falls still remains. Therefore, the present invention provides a method of using a grinding wheel having a straight outer circumference according to the related art I without using a grinding wheel having a special shape such as the related art II, and adjusting a contact position between the grinding wheel and the tire and a contact position between the contactor and the tire. It is an object of the present invention to provide a tire grinding device that does not cause displacement and does not fall into a large groove.

[0008]

Means for Solving the Problems In order to achieve the above object, the present invention takes the following measures. That is, the tire grinding device of the present invention, to grind the tire outer peripheral surface, rotatably supported by a grindstone head, the outer peripheral surface is a straight grindstone, and to detect the origin of the cutting amount of the grindstone, the tire And a contact arranged at a position in the tire circumferential direction with respect to the grinding wheel so as to contact the outer peripheral surface.

The contact is constituted by a roller having a straight outer peripheral surface and a width substantially equal to the width of the grinding wheel. This roller is provided on the housing so as to be rotatable and parallel to the axis of the grinding wheel. The housing is provided on the grindstone head so as to be relatively movable, and is urged toward the tire via an elastic member.

[0010]

According to the tire grinding apparatus of the present invention, since the grindstone and the contact are provided on the same grindstone head, they approach the outer peripheral surface of the tire while maintaining the same relative positional relationship. then,
First, the contact comes into contact with the tire outer peripheral surface. The point at which the contact is pushed in by a predetermined amount against the elastic member is set as the cutting origin of the grinding wheel. Based on this origin,
The cutting amount of the grindstone is controlled.

At this time, according to the present invention, the outer peripheral surface of the grindstone and the outer peripheral surface of the roller constituting the contact are both straight and the same shape, and the width of the roller is substantially the same as the width of the grindstone. Therefore, even if the position of the grinding wheel head changes and the contact position between the grinding wheel and the tire changes, the contact position between the contact and the tire outer peripheral surface also changes in the same way, and the contact position between the grinding wheel and the tire and the contact There is no deviation from the contact position of the tire. Therefore, there is no need to correct the origin.

By increasing the diameter of the roller, it is possible to prevent the roller from falling into the groove of the tread.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows the overall configuration of the tire grinding device.
In the figure, a tire 1 is set on a tire uniformity machine (not shown) in a vertical axis posture. The tire 1 is forcibly rotated around the vertical axis.

A grinding device 2 for grinding the crown portion and the upper and lower shoulder portions of the tire 1 is provided in the tire uniformity machine. The grinding device 2 has a column 3 fixedly arranged in the vertical direction on the side of the tire 1 in parallel with the axis of the tire 1. This column
3, a pair of upper and lower saddles 4 are provided so as to be vertically movable. A base 5 is provided on each saddle 4 so as to be pivotable in a direction along the arc surface of the tire crown. Then, a grinding wheel head 6 is provided on each base 5,
It is provided movably in the direction approaching and moving away from one side.

FIGS. 1 to 3 show details of the grinding apparatus. That is, the base 5 is rotatably mounted on the saddle 4 via the pivot 7, a slide rod 8 is provided on the base 5, and the grindstone head 6 is movably attached to the slide rod 8. . The grindstone head 6 is movable by a cylinder 9 provided on the base 5.

The grinding wheel head 6 has a grinding wheel 10 rotatably supported at the tip end on the tire side. This whetstone 10
The wheel is provided on the grindstone head 6 so that its rotation axis is parallel to the tire axis when the base 5 is in a horizontal posture. The grinding wheel head 6 includes the grinding wheel 10
A motor 11 for rotating the motor is mounted. The rotation axis of the motor 11 and the rotation axis of the grinding wheel 10 are
Linked at 12

The grindstone 10 has a cylindrical shape or a disk shape whose outer peripheral surface is straight. The outer periphery of the grindstone 10 is covered with a dustproof hood 13 except for the tire 1 side.
Further, a bracket 14 is fixed to the side of the dustproof hood 13 on the grinding wheel head 6, and an operation transformer 15 is attached to the bracket 14. This operating transformer 15 is
It has two sliders 16, and a housing is provided at the tip of the slider 16.
A roller 17 as a contact is fixed to the housing 17.
Are rotatably supported. The axis of this roller 18 is
It is parallel to the axis of the grinding wheel 10. And this roller 18
Are arranged in the tire circumferential direction with respect to the grindstone 10, and are arranged at the same position as the grindstone 10 in the tire width direction. A tire diameter line 19 passing through a midpoint between the grindstone 10 and the roller 18 and the slide rod 8 are arranged in parallel (see FIG. 1). The outer peripheral surface of the roller 18 is straight, and The width dimension of 18 is the same as the width of the grindstone 10. Further, the diameter of the roller 18 is set to be large enough not to fall into the groove of the tire tread.

A spring 19, which is an elastic member, is externally fitted to the slider 16. The spring 19 constantly urges the housing 17 toward the tire. The bracket 14 is provided with a limit switch 20. The limit switch 20 is connected to the housing 17
Is a safety switch that senses when it has moved a predetermined amount or more against the spring 19 and notifies an abnormality.

The operating transformer 15 outputs a detection signal to a control device (not shown), sets a control position origin of the tire 1 and the grindstone 10, and outputs a signal for controlling a cutting amount of the grindstone 10. Things. The cutting amount of the grindstone 10 is controlled by the cylinder 9. According to the embodiment of the present invention having the above configuration, the grinding device 2 and the tire 1
Are arranged as shown in FIG. That is, the whetstone head 6
Are arranged at a predetermined inclination angle θ with respect to the tire 1. At first, the tire 1 and the grinding wheel 10 are not in contact with each other.

In this state, the uniformity of the tire 1 is measured by a tire uniformity machine (not shown), and an uneven portion is detected. This uneven portion is ground by the grinding device 2. First, the grinding wheel head 6 approaches the tire outer peripheral surface by the cylinder 9. Rollers that are contacts
18 comes into contact with the tire outer peripheral surface. At this time, the grindstone 10 has not yet contacted the tire outer peripheral surface. When the grinding wheel head 6 further moves toward the tire outer peripheral surface, the roller 18 is pressed against the tire outer peripheral surface, the spring 19 urging the housing 17 is compressed, and the slider 16 of the operation transformer 15 moves.

The time when the slider 16 moves by a predetermined amount is set as the origin of the cutting amount of the grindstone 10. Then, based on the origin, a cutting amount to be ground to remove the non-uniformity is calculated by a control device (not shown), and based on the calculation result, the grindstone 10 is pushed in by the cylinder 9 and the tire The outer peripheral surface of the tire is ground by contacting the outer peripheral surface.

When the inclination angle θ of the grinding wheel head 6 is changed during the grinding, the contact point between the grinding wheel 10 having a straight outer surface and the tire outer surface having a predetermined curvature is shifted.
In the present embodiment, the outer peripheral surface of the roller 18 as a contact is also straight, and the width thereof is substantially the same as that of the grindstone 10, so that
The displacement of the contact point between the roller 18 and the tire 1 is also the same, and there is no displacement between the contact points.

Therefore, there is no need to correct the origin. Further, since the diameter of the roller 18 is large, the roller 18 does not fall into the groove of the tread portion. What is shown in FIG.
Another embodiment of the present invention is different from the above embodiment,
The roller 18 as a contact is arranged in a pair in front and rear in the tire circumferential direction. In this case, the diameter of the roller 18 may be smaller than that of the embodiment. The middle point between the pair of front and rear rollers 18 is in a relationship that coincides with the center of the roller 18 in the embodiment. Other configurations are the same as those of the above embodiment. According to this embodiment, since a pair of rollers 18 as contacts are arranged,
When one roller 18 tries to drop into the tread groove, the other roller 18 prevents the drop.

If the distance between the two rollers 18 is equal to the distance between the tread grooves, the above-mentioned effect of preventing the fall is not exerted. Therefore, an adjusting device 21 for adjusting the distance between the two rollers 18 is provided. FIG. 6 shows another embodiment of the present invention, in which a belt 22 is circulated between the pair of rollers 18 shown in FIG. This belt 22 comes into contact with the tire peripheral surface. Other configurations are the same as those shown in FIG. In this case, the inter-roller adjusting device is used as the belt tension adjusting device 23.

According to this embodiment, it is possible to prevent the contact from dropping in the tire 1 having a large tread groove width. Note that the present invention is not limited to the above embodiment.

[0026]

According to the present invention, even when a grindstone having a straight outer periphery which is easy to form is used, the contact position between the grindstone and the tire can be improved.
This has the effect that no deviation occurs between the contact and the contact position of the tire, and the contact does not fall into a large groove.

[Brief description of the drawings]

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

FIG. 2 is a side view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is an overall configuration diagram of a grinding apparatus according to an embodiment of the present invention.

FIG. 5 is an enlarged view of a main part showing another embodiment of the present invention.

FIG. 6 is an enlarged view of a main part showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tire 2 Grinding device 6 Grinding stone head 10 Grinding stone 17 Housing 18 Contact (roller) 19 Elastic member 22 Belt

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-221231 (JP, A) JP-A-60-147634 (JP, A) JP-B-46-31599 (JP, B1) JP-B-63 34819 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29D 30/00-30/72

Claims (1)

(57) [Claims] 1. A grindstone having a straight outer surface rotatably supported by a grindstone head for grinding the outer peripheral surface of a tire and contacting the outer peripheral surface of the tire to detect the origin of the cutting amount of the whetstone. Therefore, in a tire grinding device provided with a contact arranged at a position in a tire circumferential direction with respect to the grinding wheel, the contact has a roller whose outer peripheral surface is straight and has a width substantially equal to the width of the grinding stone. The roller is provided on the housing so as to be rotatable and parallel to the axis of the whetstone, and the housing is provided on the whetstone head so as to be relatively movable and a tire is provided via an elastic member. A tire grinding device which is biased to the side.