JPH0387246A - Method and apparatus for correcting lateral vibration of tire grooving - Google Patents

Abstract

PURPOSE:To hold the groove position to the center of a tread to a predetermined position even when lateral vibration is generated in a tire by controlling a horizontal moving stand and a lift stand in reference moving quantity and allowing the corrected moving quantity corresponding to the detection value of a detector to follow the reference moving quantity to correct the moving quantity of a cutter. CONSTITUTION:When a drive motor 61 is driven according to a reference program, a shaft 62 is rotated and a horizontal moving stand 5 is moved by predetermined quantity in a Y-axis direction and, when a correction motor 63 is driven according to a correction program, a shaft 64 is rotated and a follower gear 68 is rotated to move the horizontal moving stand 5 by predetermined quantity for the sake of correction. When the reference quantity moving mechanism part of a lift stand driving apparatus 8 is driven to allow a lift stand 7 to fall in a Z-axis direction and a heated cutter 10 is cut in a tire 3, in such a case that the lateral vibration E2 of the tire 3 is generated and a tread center line is shifted, the moving quantity correction mechanism part of the horizontal moving stand 5 is driven according to the correction program corresponding to the detection value due to a lateral vibration detector 13 and the horizontal moving stand 5 is moved in the Y-axis direction to correct the position of a cutter and the distance L of a groove position from the center of the tire is held.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a correction method and device for controlling a cutter position in a tire grooving device in response to lateral runout in which the tire cutting surface moves in the width direction of the tire. Regarding.

(Prior art) A device for grooving the tread surface of a new or retreaded tire has a tire support shaft that supports the tire vertically, a lateral movement at least parallel to the tire support shaft, and a rectangular movement in a direction perpendicular to the tire support shaft. The machine is equipped with a cutter device that can cut the tire, but while the tire is rotating, a predetermined cutter is used to prevent lateral vibration from occurring in the width direction of the tire side surface due to distortion of the tire itself or uneven support of the tire. Even if grooving is performed by controlling the cutter to move according to the shape, the position of the groove relative to the center of the tread differs from tire to tire, and the center of the tread may shift to one side even for tires with a single tire, resulting in an unstable product. , there are quality problems such as reduced strength.

For example, Japanese Patent Laid-Open No. 62-74635 provides a non-contact detection means for detecting the shape of the tread surface, and controls the position of the cutter based on the detection result of the tire's radial runout, so-called vertical runout. , it has been proposed to keep the amount of rubber removed from the tire constant.

(Problem to be solved by the present invention) However, in such a tire grooving device, the cutter cannot be moved in response to the lateral vibration of the tire, and the groove position can be adjusted by following the lateral vibration of the tire. There are problems such as the inability to maintain a constant value.

(Means for Solving the Problems) The present invention uses a plurality of operating axes to control the movement of a cutter to form a desired pattern of grooves on the tire surface. The horizontal runout of the tire is detected, and the amount of movement according to the standard program of the traverse drive shaft that moves the cutter parallel to the tire support shaft is determined by the cutter correction program based on the detected value. In addition, for this purpose, a detector is provided to detect lateral runout in the width direction of the tire, and a transverse drive shaft that is rotated according to a standard program and moves the cutter in the width direction of the tire; A traverse correction shaft is provided parallel to the traverse drive shaft and rotates to move the cutter according to a correction program based on the detection value of the detector.

(Function) Therefore, according to the standard program that sets the cutter position relative to the standard tread surface of the tire, the base 91g movement of the traverse drive shaft that is moved in the width direction of the tire is applied to prevent the lateral runout of the tire before or during grooving. The correction movement of the traverse correction axis operated by the correction program according to the detection value of the detector is combined in a one-to-one manner to follow and correct the cutter position with respect to the tire shake.

(Example) This will be explained in detail with reference to the embodiment shown in the figure.

In the grooving device shown in FIGS. 1 and 2,
1 is bed, 2 is bed! With the tire support stand installed on top,
A tire 3 is attached to the second tire support shaft and rotated by a motor 22. Reference numeral 4 designates a base that allows a rail 4I on the bed I to be moved along a guide bar 42 in the X-axis direction perpendicular to the axis of the tire support base 2 by a motor (not shown). Note that the base 4 does not need to be moved as long as the distance between it and the tire support is set to a predetermined value.

Reference numeral 5 denotes a traverse table that moves on the base 4 along the rail 43 in the Y-axis direction parallel to the tire support axis, and 6 is a traverse drive device for the traverse table 5. As is particularly clear in FIG. A transverse drive shaft 62 that is rotated by a drive motor 61 on the table 4 and constitutes a feed screw; A traverse correction shaft 64 made of a spline shaft rotated by a +li positive motor 63 is provided parallel to the Y-axis direction parallel to the tire support shaft 2I, and is provided on the lower surface of the traverse table 5.
An internally threaded body 65 and a support post 66 made of ball screws are attached to the frame 51 so as to be freely rotatable.
is screwed onto the threaded portion of the transverse drive shaft 62, and the support boss 6
6 is inserted into the traverse correction shaft 64 so that it can rotate together with the shaft and move freely in the axial direction. 67 is the support boss 66
A drive gear 68, which is integrally fixed to the transverse drive shaft 62, is a driven gear fixed to the female threaded body 65 and is meshed with the drive gear 67. 69 is a support bearing on the base 4.

7 is the straight stand, and 8 is the straight stand 7 as the tire support shaft 2! This is a orthogonal drive device that moves the orthogonal table 7 in the X-axis direction perpendicular to Move it up and down.

7! 2 is a rotating arm, which is attached to an arm support shaft 72 projecting from the orthogonal table 7 in the X-axis direction, and is rotated around the axial center line 73 of the arm support shaft 72 by a motor (not shown) in the orthogonal table 7 as shown in FIG. It is rotated in the direction of arrow A.

Reference numeral 9 denotes a cutter support device mounted in a direction perpendicular to the pivot arm 71 toward the axis 73. A cutter support frame 92 is provided on a column 91 supported by the pivot arm 71.
The cutter 10 is removably attached to a cutter holder 94 attached via the cutter holder 94 so that the cutting position P coincides with the axis 73, and the cutter 10 is heated by a power supply device (not shown). 11 is a motor that rotates the cutter support device 9 to change the direction of the cutter, and 12 is an actuator that moves the cutter support device up and down to align the position of the cutter IO with the axis 73.

Note that instead of the actuator 12, the position at which the cutter support device 9 is attached to the support 1191 may be adjusted so that the cutter cutting position P coincides with the axis 73.

Reference numeral 13 denotes a lateral vibration detector for detecting lateral vibration of the tire, which is opposed to the buttress on the side surface of the tire at an appropriate interval m. The sensor is an optical reflection type displacement sensor, etc., which emits light toward the full 11 surface of the tire supported by the tire support shaft 21, and the detected value is manually transmitted to a control device (not shown) to drive the correction motor 63 of the traverse drive device 6. drive.

4 and 5 show another embodiment of the traverse drive device 6 for driving the traverse table 5. The traverse drive shaft is rotated by a drive motor 61 provided on the base 4 and constitutes a feed screw. 6
2 and an intermediate support stand 602 supported by a guide rod 601
The traversing drive shaft 6 is provided through the female part 603.
2, the intermediate support base 602 moves. A correction motor 63 and a traverse correction shaft 6.1 constituting a feed screw are provided on the intermediate support 602, and the female threaded portion 604 of the traverse table 5 supported by the rail 43 is screwed into the traverse drive shaft 64. I'm letting you do it. Note that 605 is a bearing, and the transverse drive shaft 62 and the grooved sleeve 64 may be arranged in the same position.

In the above embodiment, the cutter IO is provided above the tire 3, and '7? Although the description has been made with respect to a grooving device that moves the cutter downward F2, it goes without saying that the present invention can also be applied to a device that moves the cutter in a lateral direction perpendicular to the tire support shaft.

Further, the motor may be a fluid type servo motor instead of an electric type servo motor, and since the correction motor only needs to perform minute position correction, it may be operated at low speed and may have a small capacity.

Note that the lateral runout detector 13 is not limited to an optical reflective displacement sensor, but may also use a contact type differential transformer or a digital dial gauge, and is installed on both sides of the tire to determine the cutter position based on the detected values on both sides. Correction may be made.

(Operation) The operation of detecting tire runout, capturing runout data, and performing calculations to correct cutter while performing grooving using the present invention will be described with reference to the flowchart of FIG.

When the operating power is turned on, the origin position of each operating axis is set according to a command from a computer (not shown) according to the grooving pattern.

A tire 3 having pattern grooves formed thereon is attached to a tire support shaft 21, and a lateral runout detector 13 is installed facing the side surface of the tire buttress.

Control values when there is no tire runout are input into the standard program of the computer, and according to this program, the motor 11 sets the direction of the cutter 10 according to the cutting direction, and the motor 22 moves the tire 3 along the arrow (
1), the drive motor 8I of the orthogonal drive device 8 of the orthogonal table 7 is operated, and the orthogonal drive shaft 82
, the orthogonal table 7 is lowered in the Z-axis direction via the female threaded body 85, and the cutter 10 heated by power supply is moved to the tire 3.
The drive motor 61 of the traverse drive device 6 is driven according to the standard program according to the predetermined groove shape, and the traverse base 5 is moved in the Y-axis direction by rotation of the traverse drive shaft 62. This controls the lateral movement of the cutter 10 and performs the required grooving.

In addition, as shown in FIG. 6, when the tire 3 has a lateral runout E and the tread center line is biased from a to b, the lateral runout E is generated from the Urasa program in accordance with the detected value by the lateral runout detector 13. The correction motor 63 of the device 6 is controlled, and in the traverse drive device shown in FIG. The cutter position is corrected as shown by the dotted line by moving it, and the distance IM of the groove position from the tire center is maintained.

In the traverse drive device shown in FIGS. 4 and 5, the traverse correction shaft 64 is rotated by the rotation of the correction motor 63, and the traverse table 5 is moved via the female threaded portion 604.

In this way, the lateral runout of the tire is detected during grooving, and the traverse drive shaft is controlled by the standard program, and the position of the traverse table is adjusted by the Urasa program based on the detected value, and the distance between the tire buttress surface and the lateral runout sensor is adjusted. m (Fig. 2) is kept constant, and ij+Y (L position from the tire center is constant over the entire circumference of the tire.

Next, using the device of the present invention, the tire is rotated in advance to detect and store the tire runout at each rotation angle position, and the runout data is extracted and calculated during grooving to correct the cutter position. will be explained using the flowchart shown in FIG.

First, turn on the power, set the origin of each operating axis by commands from a computer (not shown), attach the tire 3 on which pattern grooves are to be machined to the tire support base 2, and match the origin mark to a specific wear indicator and holder. mark on the tread surface and mark the k'/jfi deviation sensor 1.
3 toward the tire buttress.

The tire 3 is rotated at a low speed, the marking position is set as the origin in the NG control, the tire 3 is rotated once from this position, and the detected value of the groove runout sensor 13 during this period is stored in a memory together with the rotation angle position.

When the automatic operation button is pressed after the runout data has been stored in the memory, the tire support shaft 2I rotates according to the standard program of the NC device, and the cutter IO is controlled by multiple operating axes such as the transverse axis, orthogonal axis, and rotary axis. The cutter is then lowered into contact with the tire at a predetermined position, and during this time the cutter is heated to perform predetermined grooving in accordance with the rotational angular position from the origin in a constant trajectory.

Runout data is retrieved from the memory according to the rotational angular position of the tire, and the uramasa amount is calculated by the uramasa program using the MliiE program field control command from the standard program. Shake data is taken out, and the Urasa motor 63 of the traverse drive device 6 is operated by the +Xji shake correction claw calculated by the hli regular program.
is driven, the traverse correction shaft 64 is rotated, and the cutter 10 is caused to traverse in addition to the amount of movement according to the standard program.

(Effects of the present invention) As described above, the present invention moves the cutter parallel to the tire support shaft (the yellow drive shaft, the orthogonal drive shaft that moves the cutter in the rq direction, and the cutter that is supported by the tire support shaft). Detection for detecting lateral runout in the width direction of the tire: 4 is provided, and the traverse drive shaft and the orthogonal drive shaft are controlled by the quasi-weir thrust amount, and the correction movement amount is adjusted according to the detected value of the detector by the traverse drive shaft. Since the amount of movement of the cutter is corrected by superimposing the amount of movement of the cutter on the reference amount of movement of the shaft, the groove position of each product tire is kept constant with respect to the center of the tire tread, and the running characteristics are improved. The standard movement amount can be maintained well, the standard movement amount is always controlled at the value set by the standard program, and the correction movement amount based on the shake detection value can be corrected by a separate correction program, so the program configuration is simple. This has the effect of reducing the size of the device, ensuring correction, and improving productivity and yield.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a front view, FIG. 3 is a plan view showing a cross section of the traverse drive device, and FIG. 4 is a side view showing another example of the traverse drive device. Figure 5 is B-B
6 is an explanatory diagram showing the state of tire wobbling correction, FIG. 7 is a flowchart showing an example of a grooving operation, and FIG. 8 is a flowchart of another grooving operation. ■ is a bed, 2 is a tire support stand, 3 is a tire, 4 is a base, 5 is a traversal table, 6 is a traverse drive device, 61 is a drive motor,
62 is a traverse drive shaft, 63 is a correction motor, 64 is a traverse correction shaft, 65 is a female threaded body, 66 is a support boss, 67 is a drive gear, 68 is a driven gear, 7 is a straight table, 7I is a rotating arm, 7
2 is an arm support shaft, 73 is an axis line, 8 is a direct drive device,
81 is a drive motor, 82 is a direct drive shaft, 83 is a guide shaft,
9 is a cutter support device, 10 is a cutter, and 13 is a lateral vibration detector.

Claims (1)

[Claims] 1. In tire grooving, in which the movement of a cutter is controlled using a plurality of operating axes to form a desired pattern of grooves on the tire surface, lateral vibration in the width direction of a tire supported by a tire support shaft is controlled. is detected before grooving or while grooving, and by a cutter correction program based on the detected value while driving a traverse drive shaft that moves the cutter in the width direction of the tire according to a reference program,
A method for correcting lateral runout in tire grooving, characterized in that the amount of drive of the traverse drive shaft is adjusted to follow the lateral runout. 2. In a tire grooving device that controls the movement of a cutter using a plurality of operating axes to form a desired pattern of grooves on the tire surface, a detector that detects lateral vibration in the width direction of a tire supported by a tire support shaft. A traverse drive shaft that rotates according to a standard program and moves the cutter in the width direction of the tire, and a traverse correction axis that rotates according to a correction program based on the detection value of the detector are provided in parallel, and the traverse correction axis A lateral vibration correction device for tire grooving, comprising a traverse drive device that superimposes the rotation of the traverse drive shaft on the rotation of the traverse drive shaft. 3. The traverse drive shaft is configured with a feed screw rotatably provided on a traverse table for moving the cutter and screwed into a female screw body, and the drive gear rotates by a traverse correction shaft parallel to the traverse drive shaft; 3. The tire grooving lateral vibration correction device according to claim 2, further comprising a driven gear that is integrally connected to the female threaded body and meshes with the drive gear. 4. Both the traverse drive shaft and the traverse correction shaft are configured with feed screws, and one of the respective drive shafts and correction shafts is screwed into an internal threaded body provided on the traverse table for moving the cutter, and the other shaft is 3. The tire grooving lateral vibration correction device according to claim 2, wherein the device is attached to a fixing portion by being screwed into a female threaded portion of an intermediate support that supports the one shaft.