JPH0541428B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tire grooving device and a tire grooving method. More specifically, the present invention relates to a tire grooving device and a tire grooving method that can detect vertical runout of a tire and correct the cutting position of a cutter accordingly.

[Prior art] Conventionally, grooving for trial or small-volume tires, that is, the work of carving tread pattern grooves on vulcanized plain tires without a pattern, was usually done manually using a hand cutter. The work requires skill and long hours.

In view of the problems of the prior art, the present applicant has developed an arrangement in which the cutter support device already attached to the support stand and the tire support shaft move relative to each other in the lateral and vertical directions parallel to the tire support shaft. , an arm support shaft is provided protruding from the support base, a cutter holder is rotatably attached to the rotating arm attached to the shaft at right angles to the pivot axis, a cutter is attached to the tip of the cutter holder, and the cutter A tire grooving device has been proposed in which the main structure is such that the cutting position of the arm is aligned with the axis of the arm support shaft (Japanese Patent Laid-Open Nos. 63-54240 and 177232-1982). Publication No.).

Here, the cutting position of the cutter refers to a specific position of the cutter located at a certain distance (M) (including zero) from the lower end of the cutter holder (see FIG. 1).

The formation of tread pattern grooves on a plain tire by the grooving device is performed by setting the cutting position of the cutter at the cutting line (tread processing reference point) of the plain tire installed in the grooving device.

In this way, in the above-mentioned grooving device, the cutting position of the cutter is always maintained on the axis of the rotating arm support shaft, and also on the cutting line of the plain tire, so the amount of movement of the support stand and the rotating arm can be calculated. It is easy to create a computer program, and the grooving is accurate.

However, in general, if the tire itself is not a perfect circle, and due to the inclination of the tread surface or the unevenness of the tire support, the tread surface will sway in the radial direction from the center of the tire support shaft, the tire will be set while rotating. Even when grooving is performed with a cutter whose movement is controlled according to a predetermined tread pattern shape using a program, the depth and width of the grooves will vary from tire to tire, even for tires of the same size and specifications. When grooving multiple grooves on a single tire, the depth and width of each groove, which should be constant, differ on the left and right sides of the tread center (tire equator), making the product unstable and increasing its strength. There were quality problems such as a decline in the quality of the product.

For this reason, for example, as shown in Japanese Patent Application Laid-Open No. 62-74635, a non-contact type detection means for detecting the shape of the tread surface is provided, and the position of the cutter is controlled based on the detection result. A method has been proposed in which the amount of rubber removed from the rubber is constant.

[Problems to be Solved by the Invention] However, in such a tire grooving device, it is necessary to provide a large frame in order to provide a means for detecting the grooving shape, and it is necessary to provide a large-scale frame to provide a means for detecting the grooving shape. Since the groove depth is kept constant, the groove depth cannot be kept constant over the entire circumference of the groove that goes around the circumferential direction, and in order to keep the amount of rubber removed constant, an image detector is used to adjust the field of view of the detector. The position of the cutter when cutting is calculated from the area occupied by the tire, and even if the amount of rubber to be removed is fixed, if another groove has already been formed, the tire If the radius changes on the left and right sides of the equatorial plane, it is not only very difficult to calculate from the area, but also to adjust the groove depth and groove width to a specified value by following the vertical runout of the tire. There are problems such as not being able to make it constant.

The present invention has been made in view of the problems of the prior art, and it is an object of the present invention to provide a tire grooving device and a grooving method that can perform a desired grooving process even if the tire has longitudinal runout.

[Means for Solving the Problems] The tire grooving device of the present invention includes (a) a tire support device that rotatably supports a tire, (b) a rotatable cutter support device, and (c) the above-mentioned. a rotating arm that holds a cutter support device at one end; (d) an arm support shaft that rotatably holds the rotating arm; a reference amount moving mechanism section; and a movement amount correction mechanism section that can be raised and lowered; (e) a horizontal movable base having a reference amount movement mechanism that maintains the vertical movement and is movable at least in a lateral direction parallel to the tire support axis of the tire support device; (f) a vertical vibration of the tire; and (g) a control means, the control means controlling the corrected movement amount of the cutter based on the signal from the standard operation operation section for setting the cutter to a theoretical cutter cutting position, and the longitudinal runout detection means of the tire. The present invention is characterized by comprising a correction operation operation unit that calculates the correction movement amount and operates a movement amount correction mechanism provided in the elevator platform based on the corrected movement amount calculation value.

Further, the tire grooving method of the present invention is a method of grooving a tire according to a standard program, which comprises: (a) a step of detecting vertical runout of the tire; and (b) correcting the amount of elevation of the cutter based on the detected value of vertical runout. It is characterized in that it is provided with a step.

It is preferable that the amount of elevation and descent of the cutter is corrected by a correction program provided separately from the reference program.

[Function] The tire grooving device of the present invention includes a horizontal moving table for moving a cutter having a reference amount moving mechanism section in parallel to the tire support shaft, and a cutter having a reference amount moving mechanism section and a movement amount correction mechanism section. The horizontal moving table and the lifting table are controlled by a reference movement amount because the horizontal moving table and the lifting table are provided with a lifting table for vertically moving the tire, a detecting means for detecting vertical vibration of the tire, and a means for controlling each of the moving parts. At the same time, the cutter can be controlled to the optimum position by making the corrected movement amount according to the detection value of the detection means follow the reference movement amount.

Further, according to the tire grooving method of the present invention, the standard movement amount of the horizontal moving platform and the lifting platform is controlled by the standard program, and the vertical vibration of the tire is detected and the vertical vibration is corrected according to the detected value. By making the amount of movement follow the reference amount of movement, the cutter can be controlled to the optimum position.

[Examples] Hereinafter, the present invention will be explained in detail based on Examples, but the present invention is not limited only to these Examples.

1 and 2 are a side view and a front view of an embodiment of the tire grooving device of the present invention. Fig. 3 is a main functional block diagram of the tire grooving device shown in Figs.
FIG. 5 is a flowchart showing the grooving operation, and FIG. 6 is a detailed flowchart of the grooving section shown in FIG. 5.

In the grooving apparatus shown in FIGS. 1 and 2, 1 is a bed, and 2 is a tire support device provided on the bed 1. A tire 3 is mounted on a tire support shaft 21 and rotated by a motor 22. 4 is the base,
The tire is movable along a guide bar 42 on a rail on the bed 1 in the X-axis direction perpendicular to the axis of the tire support shaft 21 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 shaft 21 is set to a predetermined value.

Reference numeral 5 denotes a horizontal moving table that is moved on the base 4 along the rails 41 in the Y-axis direction parallel to the tire support shaft by a reference amount moving mechanism.

Reference numeral 7 indicates an elevating table that moves in the Z-axis direction perpendicular to the bed 1 along a guide shaft 52 on the horizontal moving table 5, and 8 is an elevating table driving device that moves with the reference amount moving mechanism as shown in FIG. It consists of an amount correction mechanism section.

Reference numeral 71 denotes a rotating arm, which is attached to an arm support shaft 72 that protrudes from the lifting table 7 in the X-axis direction, and is rotated by a motor (not shown) of the lifting table 7.
2 in the direction of arrow A in FIG.

Reference numeral 9 denotes a cutter support device mounted vertically from the rotating arm 71 toward the axis 73. A cutter support frame 92 is provided on a column 91 supported by the rotating arm 71, and is attached via an insulator 93. The cutter 10 is detachably attached to the cutter holder 94 so that the cutting position P of the cutter 10 is aligned with the axis 73, and the cutter 10 is connected to the cutter holder 94 by a power supply device (not shown).
It is designed to heat up. 11 is a motor that rotates the cutter support device 9 in the direction of arrow C to change the direction of the cutter, and 12 is an actuator that independently moves the cutter support device 9 up and down in order to align the cutting position P of the cutter 10 with the axis 73. .

Note that instead of the actuator 12, the support 91
Adjust the position to attach the cutter support device 9 to
The cutting position P of the cutter 10 may be made to coincide with the axis 73.

Reference numeral 14 denotes a longitudinal vibration detector for detecting radial displacement of the tread surface of the tire 3, for example, a rotation arm 71.
Alternatively, an optical reflective displacement sensor attached to the cutter support frame 92 is configured to project light toward the tire tread surface in the direction of the center of the tire. The detected value of the vertical shake detector 14 is given to a control device (not shown), which drives the movement amount correction mechanism of the elevator platform drive device 8.

Next, let's talk about the grooving process using the tire grooving device configured as described above.
This will be explained based on the block diagram shown in FIG. 4 and the flowchart shown in FIGS. 5 and 6.

When the operating power is turned on, the origin position of each moving mechanism section is set according to a grooving pattern by a command from a reference operation operation section (see FIG. 4) of the control means.

The tire 3 on which patterned grooves are to be formed is attached to the tire support shaft 21, and the vertical runout detector 14 is installed facing the planned grooving position of the tire tread.

A reference program for controlling the operation of the cutter when there is no tire vibration is stored in the memory of the reference operation operation section. According to this standard program, the motor 11 sets the direction of the cutter 10 according to the cutting direction, the cutter 10 is heated by power supply, the tire 3 is rotated in the direction of arrow B by the motor 22, and the lifting platform 7 is rotated. The reference amount moving mechanism section of the lifting platform drive device 8 is driven to lower the lifting platform 7 in the Z-axis direction, and the heated cutter 10 is made to cut into the tire 3.

When the groove is cut to a predetermined depth d from the reference tread surface F shown by the solid line in FIG. , the horizontal moving table 5 is moved in the Y-axis direction to control the horizontal movement of the cutter 10, and required grooving is performed.

On the other hand, the memory of the correction operation operation unit (see Figure 4)
A correction program for correcting the amount of movement of the cutter based on the vertical runout of the tire is stored in the . Therefore, for example, if there is vertical runout _E1 as shown by the two-dot chain line in FIG. The movement amount correction mechanism of the lifting platform 7 is driven according to the correction value from , and the lifting platform 7 is raised in the Z-axis direction, the cutter 10 is raised, the cutter position is corrected, and the depth d is maintained constant. let

Next, the configurations of the reference amount moving mechanism section and the moving amount correction mechanism section of the lifting table 7 will be explained.

FIG. 8 is a configuration diagram of one embodiment of the lifting platform driving device 8. In the embodiment shown in FIG. 8, the reference amount moving mechanism includes a frame body 89 having a support member therein, and a female screw having a driven gear 88 rotatably held by the support member via a bearing. body 85
is rotatably installed vertically on the bottom of the horizontal moving table 5,
The female threaded body 85 penetrates the bottom surface of the frame body 89.
A ball screw shaft 82 is screwed together with the frame body 89 and extends through the upper surface of the frame 89, and one end is connected to the upper end of the ball screw shaft 82, extends from the upper surface of the horizontal moving table 5, and has a pulley at the other end. a drive motor 81 disposed on the side wall of the horizontal movable table 5 having a pulley connected to the pulley of the power transmitting member via a belt; and a drive motor 81 disposed vertically on the bottom surface of the horizontal movable table 5. It penetrates the bottom surface of the frame 89, slidably fits into the through hole provided in the support member, penetrates the top surface of the frame 89, and is fixed to the top surface of the horizontal moving table 5. guide shaft 52
It is made up of.

When the drive motor 81 is driven according to the standard program, the ball screw shaft 82 is also rotated, and the elevator platform 7 is also moved by a predetermined amount in the Z-axis direction.

The movement amount correction mechanism includes a support boss 86 in which a plurality of spline grooves are formed in the axial direction and a drive gear 87 rotatably held on a support member via a bearing, and a support boss 86 on the bottom surface of the horizontal movement table 5. The frame body 89 is rotatably installed vertically, passes through the bottom surface of the frame body 89, and slidably engages with the support boss 86.
A spline shaft 84 extending through the upper surface of the
and a correction motor 83 disposed on the upper surface of the horizontally movable table 5, which has a drive shaft extending from the upper surface of the horizontally movable table 5 and coupled to the spline shaft. Here, the driving gear 87 is the driven gear 8
It meshes with 8.

When the correction motor 83 is driven in accordance with the correction program in this state, the spline shaft 84 rotates, causing the drive gear 87 to rotate. As the drive gear 87 rotates, the driven gear 88 rotates, thereby lifting the platform 7.
is corrected by a predetermined amount. Spline shaft 84
is slidably engaged with the support boss 86, so
The movement of the lifting platform 7 according to the standard program is not obstructed.

FIG. 9 is a structural diagram of an embodiment of the holding mechanism section of the vertical shake detector 14. The holding mechanism shown in FIG.
It consists of a guide rod 142 disposed on the bracket member 141 at right angles to a line connecting the bracket member 44, and a support plate 173 slidably attached to the guide rod 142. An optical reflective displacement sensor 144 is provided at the tip of the support plate 143. The position of this sensor 144 is adjusted by moving the support plate 143 along the guide rod 142 when the lifting platform 7 is moved up and down according to the tire size so that the light emitting direction of the sensor 144 is directed toward the center of the tire.

FIG. 10 is a structural diagram of another embodiment of the lifting platform driving device 8. As shown in FIG.

In the embodiment shown in FIG. 10, the reference amount moving mechanism section includes a female threaded member 85 having a thick H-shaped steel shape;
A ball screw shaft 82 is rotatably installed vertically on the bottom surface of the horizontal moving table 5 and is screwed into and extends from the female threaded member 85. A guide shaft 52 is slidably fitted into a through hole provided in the horizontal moving table 5 and is fixed to the upper surface of the horizontal moving table 5, and one end is connected to the other end of the ball screw shaft 82 and The drive motor 81 is fixed to the horizontal movable table 5 and has a pulley connected to the pulley of the power transmission member via a belt.

When the drive motor 81 is driven according to the standard program, the female threaded member 85 is moved by a predetermined amount in the Z-axis direction. When the female threaded member 85 is moved by a predetermined amount in the Z-axis direction, the lifting table 7 held by the movement amount correction mechanism held by the female threaded member 85 is also moved in the Z-axis direction by a predetermined amount.

The movement amount correction mechanism includes a correction motor 83 disposed on the upper surface of the female threaded member 85, and a correction motor 83 disposed on the upper surface of the female threaded member 85.
3 and a ball screw shaft 84 which is rotatably held on the lower surface of a female screw member 85, and a modified horizontal T-shaped member having a female thread portion which is screwed into the ball screw shaft 84. An arm support shaft 72 is disposed on the end surface of the T-shaped member opposite to the female threaded portion.

In this state, when the correction motor 83 is driven by the correction program, the T-shaped member having the female threaded portion screwed into the ball screw shaft 84 is also moved by a predetermined amount in the Z-axis direction for correction.

In the above description, a processing procedure using feedback control based on the vertical runout detection value has been described, but if there is a deviation between the cutting position of the cutter and the vertical runout detection position, an error may occur. In order to deal with such a situation, the amount of vertical vibration of the tire may be stored in advance in the correction operation operating section, and the cutter may be corrected and moved based on the stored value.

The operation in this case will be explained in detail below with reference to FIGS. 11 to 13.

First, the power is turned on and the origin of each moving mechanism is set by commands from the control means. After pattern grooves are formed in the tire support device 2, the tire 3 is attached and set at a specific position on the tread surface as an origin mark. Vertical shake sensor 144
the tire tread toward the planned grouping position.

The tire 3 is rotated at a low speed, the marking position is aligned with the position of the vertical runout sensor 144 and used as the origin for grooving processing, the tire 3 is rotated once from this position, and the detected value of the vertical runout detector 14 during this period is Store it in memory along with the corner position. The data from the vertical vibration sensor 144 is data on the center position of the groove to be grooved.

When you press the automatic operation button after the vertical shake data has been stored in the memory, the standard program will
As the tire support shaft 21 rotates, the cutter 10
are controlled by respective reference amount movement mechanisms to descend to and come into contact with a predetermined position of the tire, during which time the cutter is heated and performs predetermined grooving in accordance with the rotational angular position from the origin in a constant trajectory.

At the same time, vertical shake data is retrieved from the memory of the correction operation operation unit according to the rotational angular position of the tire, the correction amount by the correction program is calculated by the correction program control command from the standard program, and the vertical shake correction amount is used to drive the platform. The correction motor 83 of the device 8 rotates the ball screw shaft 84, and the cutter 10
In addition to the movement amount according to the standard program (if the correction value is negative, it will be subtracted).

[Effects of the Invention] As described above, the present invention includes a horizontal moving table that moves the cutter parallel to the tire support shaft, a lifting table that moves the cutter in the vertical direction, and a detector that detects the vertical vibration of the tire. The horizontal moving table and the lifting table are controlled by a reference movement amount, and the correction movement amount according to the detection value of the detector is made to follow the reference movement amount to correct the movement amount of the cutter. , the groove depth and groove width of each product tire can be kept constant even if vertical runout occurs, and the reference movement distance is always controlled at the value set by the standard program, and correction is performed using the detected value of longitudinal runout. Since the amount of movement can be tracked and corrected using a separate correction program, the structure of the program is simple, the device can be made compact, and uniform grooving can be performed.

[Brief explanation of the drawing]

1 and 2 are a side view and a front view of one embodiment of the tire grooving device of the present invention, FIG. 3 is a main functional block diagram of the tire grooving device shown in FIGS. 1 and 2, and FIG. 1 and 2 are block diagrams showing the electrical configuration of the main parts of the tire grooving device, FIG. 5 is a flowchart of one embodiment of the grooving operation, and FIG. 6 is a detailed flowchart of the grooving processing section of FIG. 5. , FIG. 7 is an explanatory diagram showing the grooving state, FIGS. 8 and 10 are explanatory diagrams of the structure of the lifting platform drive device, FIG. 11
This figure is a flowchart of another embodiment of the grooving operation, FIG. 12 is a detailed flowchart of the detection step, and FIG. 13 is a detailed flowchart of the grooving processing section. Main symbols in the drawing: 2: Tire support device, 3: Tire, 4: Base, 5: Horizontal moving platform, 7... Lifting platform,
8... Lifting platform drive device, 14... Vertical shake detector.

Claims (1)

[Claims] 1 (a) a tire support device that rotatably supports a tire; (b) a rotatable cutter support device; and (c) a rotary device that holds the cutter support device at one end. an arm; (d) a lifting platform that is movable up and down and having an arm support shaft that rotatably holds the rotating arm, a reference amount moving mechanism section, and a movement amount correction mechanism section; (e) holding the lifting platform. (f) tire vertical runout detection means; and (g) control means. The control means calculates the corrected movement amount of the cutter based on the signal from the standard operation operation unit that sets the cutter at the theoretical cutter cutting position and the tire vertical runout detection means, and also calculates the corrected movement amount of the cutter based on the calculated value of the corrected movement amount. A tire grooving device comprising: a correction operation operation unit that operates a movement amount correction mechanism provided on the lifting platform. 2. A method for grooving tires according to a standard program, which includes: (a) a step for detecting vertical runout of the tire; and (b) a step for correcting the amount of elevation of the cutter based on the detected value for vertical runout. A tire grooving method featuring: 3. The grooving method according to claim 2, wherein the correction of the amount of elevation of the cutter is performed by a correction program provided separately from a reference program.