JPS6334013B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a tire retreading device for retreading a worn tire by winding and pressing a rubber ribbon around the surface of the tire and performing overlay molding. .

[Conventional technology]

As a conventional tire retreading device, for example,
There is one shown in Publication No. 55-11510. The structure of this device will be briefly explained with reference to FIG. Reference numeral 1 designates an extruder, which is equipped with an adjustable die 2 at the tip, a raw rubber input port 3 at the rear end, and a screw rotated by a drive motor 4, which is driven to rotate within the extruder 1. Rubber ribbon 5 is continuously discharged from 2.
This rubber ribbon 5 is guided to a rubber application device 7 via a dancer roll 6. The dancer roll 6 moves up and down according to the tension of the rubber ribbon 5, and the magnitude of the tension is converted into an electric signal by a converter 8. The rubber applying device 7 includes a movable frame 10 that can freely slide on a support frame 9, and a pressure roller 11 at the tip of the movable frame 10.
is provided. The movable frame 10 presses the pressure roller 11 against the tire 13 with an appropriate force using a pneumatic cylinder 12. The extruder 1 and the rubber applying device 7 are installed on one frame 14, and the rail 1 is parallel to the rotation axis of the tire 13.
Wheels 1 driven by a motor 16 running on 5,15
7, 17. On the other hand, the tire 13 is
It is mounted on a horizontal shaft with a tire chuck and is driven by a winding motor 18.

Then, the tip of the rubber ribbon 5 discharged from the extruder 1 is pressed onto the tire 13 by a pressure roller 11, and the tire 13 and the extruder 1 are both driven to continuously wind and press the rubber ribbon 5 around the tire 13.

Here, the cross-sectional shape of the rubber ribbon 5 is determined in advance,
The frame 14 is appropriately moved in the lateral direction according to the number of rotations of the tire 13, and the rubber ribbons 5 are sequentially lined up and crimped from one side of the surface of the tire 13 to the other. Preset control is performed so that the rubber ribbon 5 is laminated thereon.

Note that the rubber ribbon 5 is laminated on the tire 13,
As the outer diameter of the tire 13 increases, its circumferential speed increases, and the discharge amount of the rubber ribbon 5 must also increase accordingly. Therefore, the tension of the rubber ribbon 5 is detected by the dancer roller 6, and according to the signal obtained from the converter 8, the rotation speed of the drive motor 4 is increased to increase the discharge amount of the extruder 1, and the circumferential speed of the tire 13 is increased. The discharge amount of the rubber ribbon 5 that is suitable for this purpose is ensured.

[Problem that the invention seeks to solve]

In the case of a conventional tire retreading device, the tire 13
Since the structure is such that the position at which the rubber ribbon 5 is crimped moves parallel to the rotation axis of the tire 13, the rubber ribbon 5 cannot be crimped at any arbitrary position on the side surface of the tire 13. Furthermore, since the lateral movement of the pedestal 14 is controlled by preset data, if an adjustment error occurs in the shape of the rubber ribbon 5, etc., the overlay shape formed on the tire 13 will be changed from the planned one. However, it has the disadvantage that it is not possible to regenerate the tire 13 by depositing it on the tire 13 with high accuracy. This requires a worker to constantly monitor the shape of the rubber ribbon 5, etc., which requires manpower, and there is a demand for labor-saving work.

[Purpose of the invention]

An object of the present invention is to provide a tire that can reliably wrap and press a rubber ribbon at any position on the side surface of the tire, and further improve the precision of the built-up shape formed on the tire surface. The purpose is to provide a playback device.

[Means to solve the problem]

The configuration of the present invention includes: an extrusion device that continuously discharges a rubber ribbon; a pressure bonding device that pressure-bonds the rubber ribbon to a tire; a winding device that rotates the tire and swings the direction of tire rotation;
and azimuth signal generating means for controlling the azimuth of the winding device according to the number of rotations of the tire.

Other configurations of the present invention include an extrusion device that continuously discharges a rubber ribbon, a pressure bonding device that pressure-bonds the rubber ribbon to a tire, a winding device that rotates the tire and swings the direction of tire rotation; A direction signal generation means for controlling the direction of the winding device according to the number of rotations of the tire; and a diameter signal generation means for generating a diameter signal corresponding to the diameter of the tire to be formed according to the number of rotations of the tire. , a tire diameter measuring device for measuring the diameter of the tire, and comparison and correction means for comparing the measured value by the tire diameter measuring device with the diameter signal and giving a signal to the winding device so that they match. Become.

Still other configurations of the present invention include an extrusion device that continuously discharges a rubber ribbon, a pressure bonding device that pressure-bonds the rubber ribbon to a tire, and a winding device that rotates the tire and swings the direction of tire rotation. A rotation number measuring device for detecting the number of rotations of the tire, an azimuth signal generating means for controlling the orientation of the winding device according to the number of rotations of the tire, and a tire to be formed according to the number of rotations of the tire. a diameter signal generating means that generates a diameter signal according to the diameter of the tire; a tire diameter measuring device that measures the diameter of the tire; and a tire diameter measuring device that measures the diameter of the tire, and compares the measured value by the tire diameter measuring device with the diameter signal, and determines that the measured value coincides with the diameter signal. a rubber ribbon thickness measuring device for measuring the thickness of the rubber ribbon; and a rubber ribbon thickness measuring device for measuring the thickness of the rubber ribbon; and a nozzle correction means for adjusting the opening of the nozzle of the device.

[Effect]

The structure of the present invention works by predetermining where on the tire the rubber ribbon should be crimped in accordance with the number of times the rubber ribbon is wound around the tire so as to form a predetermined overlay shape, and corresponding to the number of rotations of the tire. Then, the direction of the winding device is appropriately swung, and the rubber ribbon is wound and crimped at a predetermined position on the tire.

In addition to the above-mentioned effects, another feature of the present invention is to predetermine the diameter of the tire to be formed in accordance with the number of times the rubber ribbon is wound around the tire, and to combine this diameter signal with the measured tire diameter. The tire rotation speed of the winding device is adjusted, and the rubber ribbon is wound and crimped to a predetermined tire diameter using feedback control.

In addition to the above-mentioned functions, the function of still another configuration of the present invention is to measure the thickness of the rubber ribbon to be wound and crimped, and adjust the opening of the nozzle of the extrusion device so that the thickness of the rubber ribbon becomes a predetermined value. The feedback control is as follows.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 9.

First, the structure of an embodiment of the tire retreading device of the present invention will be described with reference to FIGS. 1 to 4.

In the figure, one base 20 includes an extrusion device 22 that discharges a continuous rubber ribbon 21, a winding device 24 that rotates a tire 23, and a rubber ribbon 2.
A crimping device 25 for crimping 1 onto a tire 23 is installed.

The extrusion device 22 has a nozzle 28 whose opening is adjusted by an adjustment motor 27 at the tip nozzle of an extruder 26, a raw material input port 29 at the rear end, and a screw rotating inside the extruder 26. 30, the raw rubber input through the raw material input port 29 is continuously discharged from the nozzle 28 while being kneaded. This screw 30 is driven by a drive motor 32 whose rotational speed is adjusted via an inverter control method via a decelerator 31. In addition,
The raw material rubber input from the raw material input port 29 and the temperature inside the extruder 26 are appropriately controlled by a temperature control means (not shown).

The winding device 24 is provided with a winding direction table 33 that can be swung by a shaft 33a perpendicular to the base 20. Orientation is controlled. Further, the winding direction table 33 is provided with a vertical frame 35 that can be tilted by a horizontal shaft 35a, and the vertical direction of the vertical frame 35 is controlled by a vertical direction control motor 36 such as a DC servo motor. Furthermore, a horizontal shaft 38 driven by a winding motor 37 is provided at the head of the vertical frame 35, and a tire chuck 39 is provided at one end of the horizontal shaft 38. 38 rotations were measured.
The crimping device 25 includes three crimping rollers 42, 43, and 44 provided at the tip of a member 41 that can be projected and retracted. The member 41 is biased by a pneumatic cylinder or the like (not shown) so that the pressure rollers 42, 43, and 44 are pressed against the tire 23 with appropriate force. Further, the member 41 is provided with a tire diameter measuring device 45 for measuring the diameter of the tire 23 on which the rubber ribbon 21 is wound and crimped and whose diameter changes over time. This tire diameter measuring device 45 consists of a roll that rotates in contact with the tire 23 and an encoder that measures the number of rotations of this roll, and determines the diameter from the circumferential length of the tire. Furthermore, the rubber ribbon 21 is passed between two rolls, and the rubber ribbon 21
A rubber ribbon thickness measuring device 46 is provided to measure the thickness of the rubber ribbon 21 from the deviation of one of the rolls that moves up and down in accordance with the thickness of the rubber ribbon 21 . Among the three crimping rolls 42, 43, 44, the first crimping roll 42 is formed in the shape of a truncated cone and crimps the rubber ribbons 21 so as to be arranged diagonally with respect to the surface of the tire 23, and the other crimping roll 43 , 44 have a wavy cross-sectional edge and are formed so that the crests of the waves of the two pressure rolls do not overlap, and further securely pressure the rubber ribbon 21 crimped by the truncated conical first pressure roll 42 onto the tire 23. urge The air between the rubber ribbon 21 and the tire 23 is removed by the corrugated pressure rolls 43 and 44. In addition, by reciprocating an air bleed pin (not shown) on the rubber ribbon wrapped around the tire 23 at the timing of running,
Bleed air between laminated rubber ribbons.

A dancer roll 47 is provided between the extruder 26 and the crimping device 25, and a converter 48 is provided to detect the displacement of the dancer roll 47 and convert it into an electrical signal.

The structure of the tire retreading device of the present invention is as described above.Here, in order to explain the basic operation of this device, the operation by preset control will be explained based on FIGS. explain.

Since tire wear differs from one tire to another, the tire surface is ground down to a predetermined shape and dimension in advance.
The rubber ribbon 21 is pressure-bonded to the tire surface 23a cut to a predetermined size to define the shape to be built up. As shown in FIG. 5, since the tire 23 is symmetrical, the tire surface 2
3b and each point _P5-8 of the shaved tire surface 23a are determined _, the build-up cross-sectional area can be easily determined. Then, if the cross-sectional shape of the rubber ribbon 21 is determined, it is calculated how many times the rubber ribbon 21 should be wound at which position on the tire 23. Furthermore, in order to form a predetermined build-up shape, it is possible to determine at which position on the tire 23 the rubber ribbon 21 should be crimped depending on the number of times the rubber ribbon 21 is wound. The position to be compressed is determined by the direction θ of the bus radius l of the tire 23.

Therefore, the cross-sectional shape of the rubber ribbon 21 is determined, and the cross-sectional shape of the tire 23 is determined to correspond to the number of rotations of the tire 23.
A data table of the direction θ of the bus radius l is prepared in advance. Note that data tables are created for each different tire standard.

Therefore, first, the shaved tire 23 is mounted on the tire chuck 39, and the vertical direction of the vertical frame 35 is adjusted by the vertical direction control motor 39 so that the center of the bus radius of the tire 23 and the axis of the vertical shaft 33a of the stand 20 match.
6, the rubber ribbon 2 is released from the extruder 26.
1 is discharged, and the rubber ribbon 2 is applied to the tire 23 via a dancer roll 47 and a rubber ribbon thickness measuring device 46.
Crimp the tip of 1. And drive motor 3
2. Drive the winding motor 37 to continuously feed the rubber ribbon 21 from the extruder 26 to the tire 23.
The material is continuously wound and crimped by the crimping device 25.
At this time, the number of rotations of the tire 23 is detected by the number of rotations measuring device 40, and in accordance with the number of rotations, an azimuth signal is read out from the data table by the azimuth signal generating means 49 and is applied to the winding azimuth control motor 34. The winding direction control motor 34 moves the winding direction base 33 in response to this signal to adjust the direction of tire rotation.
The rubber ribbon 21 is wound and crimped at a designated position on the tire 23. Note that, as an example of the azimuth signal generating means 49, a data table may be stored in a storage device 50 such as a microcomputer, and data on the azimuth θ may be read out as appropriate using the number of rotations as an address. Further, either a stepwise displacement method or a stepless continuous displacement method for each rotation of the tire may be used.

Then, by winding the rubber ribbon 21, the tire 2
3's outer circumference becomes larger and the circumferential speed gradually increases.
As a result, the amount of discharge of the rubber ribbon 21 is insufficient, the tension increases, and the dancer roll 47 is displaced upward. A signal is given from the converter 48 to the drive motor correction means 52, which corrects it appropriately with the drive motor reference signal 51, and drives the dancer roll 47. The rotation speed of the motor 32 is increased to increase the amount of rubber ribbon discharged from the extruder 26. If an inverter control system is used for the drive motor 32, the rotation speed can be controlled steplessly and with high precision.

Therefore, the tire retreading device of the present invention sequentially displaces the rotating direction of the tire 23 from one end of the tire to the other end according to the number of times the rubber ribbon 21 is wound, that is, the number of rotations of the tire. Therefore, the rubber ribbon 21 can be wound and crimped near the side surface of the tire 23, and the completed overlay shape can be arbitrarily designed compared to conventional devices of this type.

Note that the azimuth signal generating means 49 is not limited to being constituted by a computer or the like, but may be constituted by a shift register or a sequencer.

Next, a control system using feedback control for operating the tire retreading device of the present invention with higher precision will be explained with reference to FIGS. 7 to 9.

In the above preset control, the tire 23
A data table of the direction θ corresponding to the number of windings of the rubber ribbon 21 around the tire, that is, the number of rotations of the tire is set in advance. (See Figure 5) is set in advance. When the rubber ribbon 21 is wound and pressed around the tire 23 in an orientation θ corresponding to the number of rotations, the buff radius l differs by the thickness of the rubber ribbon 21. This is calculated in advance and a data table is prepared.

Here, the configuration of the tire retreading apparatus of the present invention which is subjected to feedback control will be explained based on FIG.

The tire 23 mounted on the winding device 24 is driven by a winding motor 37, and the winding direction control motor 34 sets the direction of rotation of the tire. The rubber ribbon 21 discharged by the extruder 26 is wound and crimped around the tire 23 by the crimping device 25.
The number of rotations of the tire 23 is detected by the rotation number measuring device 40, and the direction signal generating means 49 is generated according to the number of rotations.
The direction signal is read out by the azimuth signal generating means 52.
Read out the diameter signal. The direction signal is given to the winding direction control motor 34 to control the direction in which the tire 23 rotates, and the diameter signal is given to the comparison and correction means 53 and compared with the signal from the tire diameter measuring device 45, and this comparison and correction is performed. The winding motor reference signal 54 is corrected by the means 53 and applied to the winding motor 37 to control the rotational speed of the winding motor 37.

Here, if the measured value from the tire diameter measuring device 45 is smaller than the diameter signal, the winding motor 37 is decelerated to increase the adhesion thickness of the rubber ribbon 21 that is wound and crimped, and the measurement value from the tire diameter measuring device 45 is If the value is larger than the diameter signal, the speed of the winding motor 37 is increased to reduce the adhesion thickness of the rubber ribbon 21 that is wound and crimped. Therefore, the rubber ribbon 21 is attached so that the tire diameter is equal to predetermined data, and the accuracy of the build-up shape can be increased compared to preset control.

Hereinafter, a specific example thereof will be explained based on FIG. 8 and FIG. 9.

In FIG. 8, the nozzle 2 is
The thickness of the rubber ribbon 21 discharged from the rubber ribbon 8 is measured by a rubber ribbon thickness measuring device 46, and the thickness is compared with a rubber ribbon thickness reference signal 55 by a nozzle correction means 56, and a signal is given to a nozzle adjustment motor 27 to adjust the nozzle 28. The opening is adjusted and the thickness of the rubber ribbon 21 is controlled to a predetermined thickness. Further, the drive motor reference signal 51 is appropriately corrected by the drive motor correction means 152 in accordance with the displacement of the dancer roller 47, and the rotation speed of the drive motor 32 is adjusted so that the rubber ribbon 21 has an appropriate tension. . Note that the rotational speed of the winding motor 37 is adjusted according to the displacement of the dancer roller 47,
The circumferential speed of the tire 23 may be determined according to the discharge amount of the rubber ribbon 21.

Further, the number of rotations of the tire 23 is detected by a rotational speed measuring device 40 and provided to an azimuth signal generating means 49 and a diameter signal generating means 52. The azimuth signal generating means 49 and the diameter signal generating means are respectively provided with storage devices 50 and 57, in which the azimuth signal and the radial signal are stored, and the number of rotations from the rotation speed measuring device 40 is used as address data to read the tire. An azimuth signal and a radius signal corresponding to the number of rotations of 23 are read out. The direction signal is given to the winding direction control motor 34 to control the direction of the winding device 24, and the diameter signal is given to the comparison and correction means 53, which controls the tire diameter measuring device 45.
compared with measurements from If they match, the tire 23 is in a state where the rubber ribbon 21 is appropriately wound and crimped, and the winding motor reference signal 54 is applied to the winding motor 37 without correction. However, if the measured value is larger than the diameter signal, the tire 23
The rubber ribbon 21 is wound and crimped to a thickness greater than a predetermined thickness, and the winding motor reference signal 54 is
is corrected to increase the speed and applied to the winding motor 37. If the measured value is smaller than the diameter signal, the rubber ribbon 21 is wound and crimped around the tire 23 thinner than the predetermined thickness, and the take-up motor reference signal 54 is corrected to reduce the speed. 37
give to Thus, the tire 23 is driven at such a speed that the measured value matches the diameter signal.

A flowchart for executing the above-described feedback control is shown in FIG.

First, data regarding the vertical orientation of the vertical frame 35 is read out and given to the vertical orientation control motor 36 to set the vertical orientation of the vertical frame 35. and,
Data regarding the drive motor 32 is read and the drive motor 32 is driven at an appropriate speed. Furthermore, the winding motor reference signal 54 is read out,
The winding motor 37 is driven. A direction signal is read out according to the number of rotations of the tire 23 driven by the winding motor 37, and the winding direction of the winding device 24 is set by the winding direction control motor 34.

Here, the thickness of the rubber ribbon 21 discharged from the extruder 26 is measured by the rubber ribbon thickness measuring device 46. Note that the opening of the nozzle 28 is set in advance by the ribbon thickness reference signal 55. The measured value and the ribbon thickness reference signal 55 are compared, and the ribbon thickness reference signal 55 is set such that if the measured value is small, the nozzle 28 is opened, and if the measured value is large, the nozzle 28 is closed. Corrected.

Next, it is determined whether the tire 23 has rotated once. Until the tire 23 completes one revolution, the diameter of the tire 23 is measured by the tire diameter measuring device 45 and compared with the diameter signal. The take-up motor reference signal 54 is corrected to increase the speed. and,
Every time the tire 23 rotates once, the number of rotations is compared with the set value, and if they match, the execution ends, and if the set value is not reached, the winding direction of the winding device 24 is determined by a direction signal corresponding to the number of rotations. Control.

Therefore, the rubber ribbon 21 is adjusted to an appropriate thickness each time the tire 23 rotates once, and the thickness of the rubber ribbon 21 is
The diameter of No. 3 is constantly measured and controlled to match the diameter signal set in advance to be optimal.
The wrapping of the rubber ribbon 21 around the tire 23 can be maintained in an optimal state from the start to the end, and a retreaded tire can be manufactured with high precision.

Note that the drive motor reference signal 51, the winding motor reference signal 54, and the ribbon thickness reference signal 55 are data stored in advance in the storage device, which are read out in the same manner as the direction signal and the diameter signal.

〔Effect of the invention〕

As explained above, according to the tire retreading device of the present invention, the orientation of the winding device is oscillated according to the number of times the rubber ribbon is wound around the tire to form a predetermined build-up shape. Rubber ribbon can be wrapped and crimped near the sides, giving a high degree of freedom in setting the build-up shape. Furthermore, since the diameter of the tire is measured and feedback control is performed, the winding and pressure bonding of the rubber ribbon around the tire can be maintained in an optimal state, and retreaded tires can be manufactured with high precision. Furthermore, by measuring the thickness of the rubber ribbon and adjusting the opening of the nozzle of the extrusion device, the thickness of the rubber ribbon is kept constant, which allows the rubber ribbon to be wrapped and crimped around the tire with even higher accuracy. Tires can be manufactured.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the structure of an embodiment of the tire retreading device of the present invention, Fig. 2 is a perspective view of the winding device shown in Fig. 1, and Fig. 3 is a vicinity of the crimping device shown in Fig. 1. FIG. 4 is a front view of the pressure roller shown in FIG. 3, FIG. 5 is a diagram illustrating how a rubber ribbon is wound around a tire and crimped, and FIG. 6 is a preset view of the device shown in FIG. Function explanatory diagram when controlled, No. 7
The figure is an explanatory diagram of the function of the device shown in Fig. 1 when feedback control is performed based on the tire diameter.
Fig. 9 is an explanatory diagram of the function when the device shown in Fig. 1 performs feedback control using the tire diameter and the thickness and tension of the rubber ribbon. Fig. 9 shows the function when the device shown in Fig. 1 performs feedback control using the tire diameter and rubber ribbon thickness. Flowchart; FIG. 10 is a side view showing the structure of a conventional tire retreading device. 21: rubber ribbon, 22: extrusion device, 23: tire, 24: winding device, 25: crimping device, 28:
Nozzle, 32: Drive motor, 34: Winding direction control motor, 37: Winding motor, 38: Horizontal shaft, 39: Tire chuck, 40: Rotation number measuring device, 42, 43, 44: Pressing roll, 45: Tire Diameter measuring device, 46: Ribbon thickness measuring device, 49: Orientation signal generating means, 52: Diameter signal generating means, 53:
Comparison correction means, 56: Nozzle correction means.

Claims (1)

[Scope of Claims] 1. An extrusion device that continuously discharges a rubber ribbon, a pressure bonding device that pressure-bonds the rubber ribbon to a tire, a winding device that rotates the tire and changes the direction of rotation of the tire, and a winding device that rotates the tire and shifts the direction of rotation of the tire. A tire retreading device comprising a rotation number measuring device that detects the number of rotations of the tire, and an azimuth signal generating means that controls the orientation of the winding device according to the number of rotations of the tire. 2. The tire retreading device according to claim 1, wherein the drive motor of the extrusion device is controlled by an inverter. 3. The tire retreading device according to claim 1, wherein the crimping device includes three crimping rolls, one of which is formed into a truncated cone, and the other two have wavy cross-sectional edges. 4. The winding device has a winding motor that drives a horizontal shaft having a tire chuck on which the tire is attached, and a winding direction control motor that swings the direction of rotation of the tire around a vertical shaft. The tire retreading device according to item 1. 5. The tire retreading device according to claim 4, wherein the winding direction control motor is a servo motor, and continuously changes the direction of rotation of the tire. 6. An extrusion device that continuously discharges a rubber ribbon, a compression device that presses the rubber ribbon onto a tire, a winding device that rotates the tire and swings the direction of rotation of the tire, and detects the number of rotations of the tire. a rotation number measuring device, an azimuth signal generating means for controlling the orientation of the winding device according to the number of rotations of the tire, and a diameter signal corresponding to the diameter of the tire to be generated according to the number of rotations of the tire. A diameter signal generating means, a tire diameter measuring device for measuring the diameter of the tire, and a tire diameter measuring device that compares the measured value by the tire diameter measuring device with the diameter signal, and transmits the signal to the winding device so that they match. A tire retreading device comprising a comparison and correction means for applying. 7 Claims in which the tire diameter measuring device comprises a roll that rotates in contact with the tire and an encoder that measures the number of rotations of the roll, and determines the diameter of the tire from the circumference of the tire. The tire retreading device according to item 6. 8. An extrusion device that continuously discharges a rubber ribbon, a pressure bonding device that pressure-bonds the rubber ribbon to a tire, a winding device that rotates the tire and swings the direction of rotation of the tire, and detects the number of rotations of the tire. a rotation number measuring device, an azimuth signal generating means for controlling the orientation of the winding device according to the number of rotations of the tire, and a diameter signal corresponding to the diameter of the tire to be generated according to the number of rotations of the tire. A diameter signal generating means, a tire diameter measuring device for measuring the diameter of the tire, and a tire diameter measuring device that compares the measured value by the tire diameter measuring device with the diameter signal, and transmits the signal to the winding device so that they match. a rubber ribbon thickness measuring device for measuring the thickness of the rubber ribbon, and adjusting the opening of the nozzle of the extrusion device so that the thickness of the rubber ribbon becomes a predetermined thickness according to the measured value. A tire retreading device comprising a nozzle correction means.