JPS63296931A - Reclaiming device of tire - Google Patents

Abstract

PURPOSE:To finish a reclaimed tire into a favorable outline and form by a simple control device, by controlling a tire turning angle every sticking thickness division by dividing a width of the tire. CONSTITUTION:A tire 3 is fixed to a tire supporting stand 41. A turning angle thetaof the stand 41 detected by a rotary encoder 58 is compared with a division point angle thetaW1 through a memory 77 by a division decision device 79 and a sticking thickness division W1 is decided. Tire turning time TW1 corresponding to the division W1 is applied to an AND device 81 through a memory 78. A detected signal (a) of a tire revolving reference point A due to an approaching switch 95 is applied to the AND device 81. Consequently, an operation signal (b) is applied to a motor driving part 92 during a period of only the turning time TW1. The tire 3 suspends its turning when the time TW1 elapses. When the reference point A is detected by turning the tire one turn, turning is begun again. When theta=thetaW1 is attained, sticking of the division W1 is completed, then the sticking of a division S2 is performed successively.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a tire retreading device that attaches ribbon rubber to the circumferential surface of a tire to be retreaded while rotating the tire. The tire retreading device of the present invention is used for retreading worn out tires of automobiles and the like.

(Prior Art) Tires whose tread portions and shoulder portions have worn out are widely recycled and reused. Tire retreading is performed as follows. First, the worn tire's circumferential surface is puff-finished so that there are no irregularities. Next, ribbon rubber is applied and built up on the circumferential surface of the puff-finished tire using a tire retreading device. Finally, embossing and vulcanization are performed simultaneously.

In a tire retreading device, a rubber ribbon is attached to the circumferential surface of the tire to be retreaded before it is rotated. The area where the pop-up rubber must be pasted and built up covers a wide area from the shoulder area to the tread area, and its width is much wider than the width of the ribbon rubber (for example, about 40 mm maximum). Furthermore, the thickness of the adhesive varies depending on the position in the width direction of the tire. Therefore, the width of the tire is divided into several sections depending on the thickness, and ribbon rubber is attached for each thickness category.

Conventionally, as shown in Fig. 5, the left and right shoulder portions are divided into two sections, W++S++W, , S, in the tire width direction.
2 and the tread portion in 1 category G, a total of 5 attachments were done by dividing them into thickness categories. Further, in one application, the width of the thickness division is wider than the width of the ribbon rubber. On the other hand, ribbon rubber is supplied toward the tire from a fixed direction. For this purpose, the tire support stand is rotated to bring the pasting unit to the ribbon rubber supply position, and the tire support stand is also rotated so that ribbon rubber is pasted over the entire width of the thickness section in one pasting process. When one pasting is completed, the thickness classification is pasted, the tire support stand is further rotated, and the next pasting is pasted the thickness classification.

As such a tire retreading device, US Pat. No. 4.206
,009 are known. The device disclosed in this US patent includes a device for supplying ribbon rubber onto the surface of a recycled tire, a device for rotationally driving the tire, a device for turning the tire in its width direction, and a control device. The control device includes means for detecting rotational angular displacement of the tire and a microcomputer. In order to make the contour of the retreaded tire into a predetermined shape, the relationship between the rotational angular displacement of the tire and the turning position is programmed into the microcomputer.

The device of the US patent configured in this manner detects the rotation angle of the tire, and uses a microcomputer to calculate the ratio between the tire rotation angle and the turning angle. Then, the tire turning device is controlled according to the above program and the ratio between the tire rotation angle and the turning angle.

(Problems to be Solved by the Invention) In the device of U.S. Pat. Kaga) was there. Furthermore, microcomputers require an external storage device such as a floppy disk driver. For this reason, handling of the device is inconvenient and the cost of the device is also high.

Therefore, it is an object of the present invention to provide a tire retreading device that can finish a retreaded tire with a good contour using a simple control device.

(Means for Solving the Problems) The tire retreading device of the present invention includes a device for supplying ribbon rubber to the circumferential surface of a tire to be retreaded, a tire support stand, a tire rotation device that rotates the tire support stand and rotates the tire. It consists of a tire turning angle detector, a tire rotation drive device, and a control device, and ribbon rubber is attached to the circumferential surface of the tire to be regenerated while rotating it. The tire retreading device further includes a tire rotation reference point detector that detects a tire rotation reference point provided on the tire. A rotary encoder, an eddy current sensor, etc. are used as a tire turning angle detector, and a limit switch, a proximity switch, etc. are used as a tire rotation reference point detector.

The control device includes a means for storing a tire rotation setting angle and a tire rotation setting time for each thickness division, and a means for storing a tire rotation setting angle and a tire rotation setting time for each thickness division, and a means for storing a tire rotation setting angle and a signal from the tire rotation angle detector. means for comparing, when the signal from the tire turning angle detector reaches the constant tire turning angle, the next affix is a means for calling the tire turning setting time of the thickness classification, and a means for calling the tire turning setting time for each thickness classification, and a means for causing the tire turning device to rotate the tire every time the tire rotates. and means for turning the tire for the set tire turning time from when the reference point is detected. A built-in memory of the microcomputer can be used as the storage means, and the comparison means, the means for calling up the tire turning set time, and the means for turning the tire by the set tire turning time are realized by software of the microcomputer. Further, a programmable controller can be used as the control device.

(Function) When starting the operation of the tire retreading device, the tire support stand is rotated by the tire rotation device to the tire rotation reference point of the first thickness classification, and the tire is rotated and set at the tire rotation reference point. .

Attaching the ribbon rubber starts from the tire rotation reference point. On the other hand, in synchronization with the signal from the tire rotation reference point detector, the tire rotation device is driven for the tire rotation time set for each thickness classification. Further, in synchronization with the signal from the next tire rotation reference point detector, the tire turning device is driven for the tire turning setting time. That is, the tire turning device is intermittently driven for the tire turning setting time every time the tire rotates once. The smaller the tire turning angle during one rotation of the tire, the thicker the thickness classification. In this way, in the first application, the ribbon rubber is applied to a thickness corresponding to the thickness.

In this way, when the first pasting of the thickness classification is completed, the second pasting adjacent to the first pasting of the thickness classification is the pasting of the thickness classification. The first attachment is different from the thickness, and the second attachment is different from the thickness, and therefore the tire rotation setting time is also different. Identification of the thickness classification is performed by comparing the set tire rotation angle with the signal from the tire rotation angle detector. Thereafter, such operations are repeated for all pasting until pasting of the thickness classification is completed.

(Embodiment) FIGS. 1 and 2 show an embodiment of the present invention, and are a side view and a plan view, respectively, of the entire tire retreading apparatus.

As shown in these drawings, the tire retreading device mainly consists of a housing 11. Ribbon rubber extrusion device 21, ribbon rubber pressing device 31, tire support stand 41, tire rotation device 51, tire rotation drive device 61, and control device 7
It is composed of 1.

The housing 11 includes a main body 12 and a frame 14 extending forward from the main body 12.

The ribbon rubber extrusion device 21 is provided in the housing body 12 and includes a screw extruder 24 driven by a drive device 22. The screw extruder 24 forces the rubber material supplied from the inlet 25 toward the mouthpiece 26 at the tip. While the material rubber is being fed under pressure, it is softened by frictional heat and heating by a heater (not shown).
It is discharged from the slit-shaped opening 6 in a ribbon shape. Base 2
A guide roll 27 is arranged on the exit side of the roller 6, and a dancer roll 28 is arranged below. dancer roll 28
adjusts the speed difference between the ribbon rubber discharge speed and the tire circumferential speed by its height position. For example, since a thick ribbon rubber 1 is attached to a large diameter tire 3, the discharge speed of the ribbon rubber 1 becomes slow. However, dancer roll 2
8 is positioned higher than in the case of a small-diameter tire 3, so that the ribbon rubber 1 is not stretched between the dancer roll 28 and a guide roll 37, which will be described next.

The ribbon rubber pressing device 31 includes a slider 33 that moves back and forth while being guided by a guide roll 32 provided in the housing body 12, and a head 35 attached to the tip of the slider 33. The head 35 is a guide roll 37
．． 38 , and the presser disposed directly above the guide roll 38 is provided with a roll 39 . The ribbon rubber 1 discharged from the mouthpiece 26 is guided by the dancer roll 28 and guide rolls 37, 38, and is pressed against the tire circumferential surface 4 by the roll 39.

The tire support stand 41 is attached to the frame 14 of the housing 11.
A pivot shaft 42 is attached to the pivot shaft 42 so as to be pivotable about a vertical axis. The lower end of the pivot shaft 42 is supported by a bearing 43, and one end of an L-shaped horizontal member 44 is fixed to the upper end. An arm 45 is provided at the other end of the horizontal member 44.
Furthermore, a mold cylinder 46 is provided at the corner of the horizontal member 44.
are each attached to be able to swing freely around a horizontal axis. The tip of the rod 46a of the modle cylinder 46 is connected to the arm 45. Mordle cylinder 46
When driven, the arm 45 tilts around the horizontal axis. Since there are various sizes of tires 3 to be regenerated, the tire position must be adjusted depending on the size so that the tire peripheral surface 4 is in an appropriate position relative to the pressing roll 39. Therefore, the arm 45 is tilted around the horizontal axis by an appropriate angle to bring the tire 3 to the proper position. Arm 4
A rotating shaft 48 is rotatably supported at the tip of the rotating shaft 48, and a chuck 49 that holds the tire 3 is attached to the tip of the rotating shaft 48.
is provided.

The tire rotation device 51 includes a DC servo motor 52 and a chain transmission mechanism 54.
The chain wheel 55 of No. 4 is attached to the tire support stand 41.
It is attached to the pivot shaft 42 of. Further, a rotary encoder 58 is arranged below the pedestal 14. The rotary encoder 58 is connected to the rotation shaft 42 of the tire support stand 41 via a gear transmission mechanism 59, and detects the rotation angle of the tire support stand 41.

The tire rotation drive device 61 consists of a DC servo motor 62 and a chain transmission mechanism 64, and the tire support stand 4
It is fixed to the arm 45 of No. 1. Furthermore, a chain wheel 65 of the chain transmission mechanism 64 is fixed to the rotating shaft 48 .

The control device 71 includes a control panel 72 and an operation setting panel 73 attached to the top of the housing 11.

Inside the control panel 72, as shown in FIG.
7.92 is provided. Speed command switch 84.9
0 allows high speed mode depending on the tire size■.

Or select low speed mode vL. The programmable controller 75 includes a reference tire rotation speed memory 76, a dividing point angle memory 77, and a tire turning time memory 78, and these reference tire rotation speeds V are set on the operation setting panel 73. (tire rotation speed when the dancer roll 28 is at the reference height position), tire turning time T corresponding to classification i,
and the turning setting angle θi are input. Following the segmentation point angle memory 77, segmentation determination means 79 and turning time recalling means 8
0 and AND means 81 are provided. These division determining means 79, turning time calling means 80, and AND means 81 are actually achieved in the logic decoding section of the programmable controller 75 based on a program. According to the operation signal from the programmable controller 75,
The motor drive section 87 drives the DC servo motor 62 for driving tire rotation, and the motor drive section 92 drives the DC servo motor 52 for tire turning. The rotational speed of the DC servo motor 52.62 is determined by the tachometer generator 88.
．． 93 and is subjected to feedback control. The operation setting panel 73 includes a numeric keypad, changeover switches, pilot lamps, etc. for setting various operating conditions.

Next, a description will be given of the operation of pasting the ribbon rubber 1 onto the circumferential surface of the tire using the tire retreading apparatus configured as described above. Figure 4 shows the procedure for pasting work.

First, after the tire 3 is fixed to the chuck 49 of the tire support stand 41, the mold cylinder 46 is driven according to the size of the tire 3, and the tire 3 is positioned at a position suitable for pressing the ribbon rubber 1. Next, control panel 7
In 2, the reference tire rotation speed ■. , the dividing point angle θ1 and the tire turning time T1 are set. In this embodiment, the left and right shoulder portions are each divided into two sections W as shown in FIG.
,,S+42. Sz, and the portion spanning the tread portion and shoulder portion are divided into two sections, G and S2, and the total of six attachments are divided into thickness sections.

Next, when a start button (not shown) is pressed, the tire 3 is rotated by the DC servo motor 62 until it reaches the rotation reference point A, and the tire support stand 41 is attached to the tire turning reference point of the thickness classification W. It is rotated by the DC servo motor 52 until it reaches the point. Then, the screw extruder 24 is started. These operations are automatically performed by operation signals from the programmable controller 75.

When the screw extruder 24 has been operating for a required period of time and conditions are suitable for applying the ribbon rubber 1, the ribbon rubber 1 is manually guided to the tire circumferential surface. Then, when a pasting work start button (not shown) is pressed, the tire rotation motor 62 is started and the tire 3 is rotated. The ribbon rubber 1 is pressed against the circumferential surface 4 of the rotating tire 3 by a roll 39. The ribbon rubber 1 is attached from the tire rotation reference point A, and the tire support stand 41 starts turning from the tire rotation reference point A.

Note that the tire rotation reference point A is detected by a proximity switch 67 arranged close to the tire 3.

During the pasting operation, the tire rotation speed is adjusted according to the ribbon rubber discharge speed from the screw extruder 24. Since the height position of the dancer roll 28 changes according to the ribbon rubber discharge speed as described above, the tire rotation speed is adjusted by detecting the height position of the dancer roll 28. That is, as shown in FIG. 3, the height position h of the dancer roll 28 detected by the position detector 96, that is, the tire rotation speed
It is input to the D controller 83. The PID controller 83 outputs an appropriate tire rotation speed V to the motor drive section 87 based on the reference tire rotation speed v0 and the height position. for example,
When the ribbon rubber discharge speed is high, the ribbon rubber becomes thinner,
The dancer roll 28 goes down. When the lowering of the dancer roll 28 is detected, the PID controller 83 issues a command to the drive circuit 87 to rotate the DC servo motor 62 at a higher speed.

The turning angle θ of the tire support stand 41 detected by the rotary encoder 58 is determined by the programmable controller 7
The information is input to the classification determining means 79 of No. 5. Here, the turning angle θ
is compared with the first division point angle θ1 from the division point angle memory 77, and the thickness division W1 of the pasting work currently being performed is identified. Then, the pasting is done in thickness class VII.
The tire turning time TWI corresponding to the tire turning time TWI is read from the tire turning time memory 78 by the turning time calling means 80 and output to the AND means 81. The detection signal a (see FIG. 3) of the tire rotation reference point A detected by the proximity switch 95 is input to the AND means 81, and the tire rotation time TWI is inputted to the AND means 81.
and the AND is removed. As a result, an operation signal is outputted from the AND means 81 to the motor drive section 92 for a period of tire turning time TWI from the point in time when the detection signal a is detected. As long as θ is 0w1, the DC servo motor 52 is driven via the drive circuit 92, and the tire support stand 41, that is, the tire 3 turns. When the tire turning time T□ has elapsed, the turning is stopped. Further, when the tire 3 rotates once and the next tire rotation reference point A is detected, the vehicle starts turning again.

In this way, the tire turning angle θ gradually increases,
The width of the paste gradually increases. And when θ=01,
The first pasting ends with pasting of thickness classification W.

In this way, when the first pasting is completed for the thickness class W, the second pasting is performed for the thickness class S2. The first attachment is different from the thickness of the thickness classification W, the second attachment is different from the thickness of the thickness classification S2, and therefore the tire rotation setting time TS2 is also different. Identification of the thickness classification is performed by comparing the tire rotation setting angle θs2 with the signal θ from the rotary encoder 58. Thereafter, such operations are repeated for all pasting until pasting of the thickness classification is completed.

(Effects of the Invention) In the present invention, the tire width is divided and the thickness classifications are stored in the memory of the programmable controller or microcomputer. Then, in synchronization with the signal from the tire rotation reference point detector, the tire turning device is driven for the tire turning time set for each thickness classification.

That is, the tire turning device is intermittently driven for the tire turning setting time every time the tire rotates once.

As described above, when the tire width is divided and pasted, the tire turning angle is controlled for each thickness division, so ribbon rubber can be pasted symmetrically around the tire circumferential surface. Further, the only operations for control are comparison and AND, and the program is extremely simple. Therefore, a programmable controller can be used as a control device, programming is simple, and an external storage device such as a floppy disk driver is not required. This makes it easier to handle the device, and it is possible to provide an inexpensive device.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, in which a side view of the entire tire retreading device is shown, FIG. 2 is a plan view of the device shown in FIG. 1, and FIG. 3 is a block diagram showing the configuration of a control device. FIG. 4 is a flowchart showing the procedure of tire retreading work, and FIG. 5 is a longitudinal sectional view of the tire to be retreaded. DESCRIPTION OF SYMBOLS 1... Ribbon rubber, 3... Tire, 4... Tire circumferential surface, 11... Housing, 21-... Ribbon rubber extrusion device, 24... Screw extruder, 28... Dancer roll, 31 ... Ribbon rubber pressing device, 39-
...Pushing is done by roll, 41-...Tire support stand, 4
6...Modle cylinder, 51-...Tire rotation device, 52...Servo motor, 58...Rotary encoder, 61-...Tire rotation drive device, 71...Control device, 75... Programmable controller, 76・
...Reference tire rotation speed memory, 77.- Division point angle memory, 78-. Tire turning time memory, 79.. Classification judgment means, 80.. Turning time calling means, 81.-
AND means, 83...-PID controller, 87.92...
・Motor drive unit, 95... Proximity switch, 96-...
position detector.

Claims (1)

[Claims] Consisting of a device for supplying ribbon rubber to the circumferential surface of a tire to be regenerated, a tire support stand, a tire rotation device that rotates the tire support stand to rotate the tire, a tire rotation angle detector, a tire rotation drive device, and a control device, A device for attaching ribbon rubber to the circumferential surface of a tire to be retreaded while rotating the tire, which is equipped with a tire rotation reference point detector for detecting a tire rotation reference point provided on the tire.
A means for storing a tire rotation setting angle and a tire rotation setting time for each pasting thickness classification set by dividing the tire width by the control device, and comparing the tire rotation setting angle and a signal from the tire rotation angle detector. and means for calling the tire rotation setting time for the next pasting thickness classification when the signal from the tire rotation angle detector reaches the tire rotation setting angle;
A tire retreading device comprising: means for rotating the tire turning device for the set tire turning time from when a tire rotation reference point is detected for each rotation of the tire.