JP2013111876A - Center line printing device for tire constituent material and method of molding tire constituent material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a center line printing device and a tire molding method for tire constituent materials which can control off-center on adhesion to an adhesion drum even when a covering sheet is adhered to both ends of a tire constituent material.SOLUTION: The center line printing device for tire constituent materials includes a means for carrying a tire constituent material, a printer printing a center line along the center of the tire constituent material in a noncontact manner and a centering mechanism fitting the center of the tire constituent material to the printing position of the printer, with the printer located upstream of the covering sheet adhesion device. A method of molding a tire constituent material including a centering step of centering a tire constituent material, a printing step of printing a center line along the center of the tire constituent material in a noncontact manner, a covering sheet adhesion step and a molding step of adhering the tire constituent material to the adhesion drum, with the center line of the tire constituent material adhered with a covering sheet fitted to the center of the adhesion drum, is also provided.

Description

  The present invention relates to a center line printing device for a tire constituent material that prints a center line on the tire constituent material in order to center and attach the tire constituent material to the sticking drum, and a tire constituent material that centers the tire constituent material on the sticking drum. It relates to a molding method.

  At the time of tire molding, when a breaker (an example of a tire constituent material) is stuck on the sticking drum, centering is performed in order to make the center of the breaker coincide with the center of the sticking drum (for example, Patent Document 1).

  When the breaker off-center does not occur, the tire ground contact shape and contact pressure distribution are symmetrical, and the lateral force deviation (lateral force deviation) during forward and reverse rotation of the tire Since the average value of the fluctuation is the same, the conicity is small.

  However, when a breaker is off-centered, the ground contact shape and contact pressure distribution of the tire become asymmetrical in the front and back, so the tire has a large conicality due to a difference in lateral force deviation during forward rotation and reverse rotation. .

  FIG. 3 is a graph showing the relationship between the off-center amount a of the breaker and the conicity N of the tire. In this graph, all factors such as off-center, tire pattern and the like of the adhesive material other than the breaker are excluded. As shown in FIG. 3, it can be seen that as the off-center amount a (absolute value) of the breaker increases, the influence on the tire conicity N increases.

JP-A 61-237626

  The present invention relates to a centerline printing device and a molding for a tire constituent material capable of suppressing off-center when sticking to a sticking drum even when a covering sheet is stuck to both ends of a tire constituent material such as a breaker. It is an object to provide a method.

The invention of claim 1
Conveying means for conveying the long tire constituent material in the longitudinal direction;
A printing machine for printing a center line in a non-contact manner at a center position of the tire constituent material;
A centering mechanism that causes the center position of the tire constituent material to coincide with the print position of the printing machine while transporting the tire constituent material by the transport means,
A tire line material centerline printing apparatus, wherein the printing machine is disposed upstream of a covering sheet sticking device for sticking a covering sheet to both ends of the tire constituting material.

The invention of claim 2
The tire printing material centerline printing apparatus according to claim 1, wherein the printing machine is configured to print the centerline by irradiating the tire building material with a laser beam.

The invention of claim 3
A centering step for centering the tire constituent materials;
A printing step for printing a center line in a non-contact manner at a center position of the centered tire constituent material;
A covering sheet attaching step of attaching a covering sheet to both ends of the tire constituent material on which the center line is printed;
A molding step in which the center line of the tire constituent material to which the covering sheet is attached is aligned with the center position of the sticking drum, and the tire constituent material is attached to the sticking drum. This is a method for forming a tire constituent material.

The invention of claim 4
In the molding step, the centering laser beam is applied to the center of the sticking drum, the center line of the tire constituent material is made to coincide with the irradiation position of the laser light, and the tire constituent material is attached to the sticking drum. A method for molding a tire constituent material according to claim 3.

The invention of claim 5
After the tire constituent material is affixed to the affixing drum, the breaker on the affixing drum is measured with a camera over the entire circumference, and the center line of the breaker is within a predetermined area within the measurement range of the camera The method for molding a tire constituent material according to claim 3 or 4, further comprising a determination step of determining that the center of the sticking drum and the center line of the breaker coincide with each other.

  According to the present invention, even when a covering sheet is applied to both ends of a tire constituent material, it is possible to suppress off-center during application to an application drum, thereby reducing the occurrence of tire conicity. can do.

1 is a perspective view schematically showing a breaker manufacturing apparatus including a breaker centerline printing apparatus according to an embodiment of the present invention. It is a figure which shows a breaker, Comprising: (A) is the top view, (B) is the sectional drawing. It is a graph which shows the relationship between the off center amount of a breaker, and the conicity of a tire.

  Hereinafter, an embodiment of a center line printing apparatus and a molding method for a tire constituent material will be described with reference to the drawings, taking a breaker as an example of the tire constituent material.

  FIG. 1 is a perspective view schematically showing a breaker manufacturing apparatus including a breaker centerline printing apparatus according to an embodiment of the present invention. 2A and 2B are diagrams showing a breaker, in which FIG. 2A is a plan view and FIG. 2B is a cross-sectional view thereof.

1. Configuration of Centerline Printing Device for Tire Constituent Material As shown in FIG. 1, the centerline printing device 1 includes a conveyor 2 that transports a long breaker (tire constituent material) 9 in the longitudinal direction, a centering mechanism 3, The printer 4 is provided.

  Here, as shown in FIGS. 2 (A) and 2 (B), the breaker 9 includes a layer of cords 90 made of a fiber material such as steel, polyester, nylon, and raw rubber 92 covering these layers of cords 90. Consisting of layers. The cords 90 are arranged so as to have a certain angle (hereinafter referred to as a breaker angle) θ with respect to the longitudinal direction of the breaker 9. The breaker angle θ is set to 15 ° to 60 °, and the breaker width W1 is set to 60 mm to 300 mm.

(1) Centering mechanism The centering mechanism 3 has two sets of guide pins 30 a, 30 b, 32 a, and 32 b that are arranged in the transport direction of the transport conveyor 2. The distance between the pair of guide pins 30a and 30b can be adjusted according to the width W1 of the breaker 9. Similarly, the distance between the other pair of guide pins 32a and 32b can be adjusted in synchronization with the movement of the guide pins 30a and 30b. The two sets of guide pins 30 a, 30 b, 32 a, and 32 b have the function of centering the long breaker 9 in the width direction of the breaker 9 in cooperation.

(2) Printing machine The printing machine 4 is a device that prints a center line that extends in the longitudinal direction without contact with the breaker 9. The printing machine 4 has a laser beam oscillation device 40, which irradiates the tire constituent material 9 with a laser beam L to thermally change (or chemically react) the raw rubber 92 of the breaker 9, and a center line extending in the longitudinal direction. 94 can be printed. The center line 94 is arbitrary such as a straight line shape or a broken line shape. In the present embodiment, as shown in FIG. 2, the center line 94 is linear, the width W2 is 0.2 mm to 2.0 mm, and the depth d is 0.05 mm to 0.5 mm. The laser irradiation temperature was set to 110 ° C. (foaming start temperature) to 350 ° C. (ignition start temperature).

  The printer 4 is not necessarily limited to printing by laser irradiation as long as the center line can be printed in a non-contact manner, and may be of a type in which ink is sprayed in a non-contact manner.

(3) Covering sheet sticking apparatus The covering sheet sticking apparatus 5 sticks covering sheets 10a and 10b to the left and right ends of the breaker 9, respectively. In the covering sheet sticking device 5, a pair of covering sheet supply wheels 52 a and 52 b are rotatably set on the shaft 50. Further, the covering sheet sticking device 5 has a sticking mechanism (not shown) for sticking the covering sheets 10a and 10b to the left and right ends of the breaker 9 that has been transported on the transport conveyor 2 of the centerline printing device 1. doing.

(4) Others As shown in FIG. 1, a cutting device 6 and a crimping device 7 are disposed on the upstream side of the centerline printing device 1 in order to cut the ply material into predetermined dimensions. Further, a covering sheet sticking device 5 and a winding device 8 are disposed on the downstream side of the centerline printing device 1. The cutting device 6 includes a transport conveyor 60 and a cutting machine (not shown). The crimping device 7 includes a conveyor 70 and a crimping machine (not shown).

  Then, by using the breaker manufacturing device including the breaker centerline printing device configured as described above, the centerline is printed in the winding process through the cutting process, the crimping process, the laser irradiation process, and the covering sheet sticking. The broken circuit breaker is temporarily wound around the winding device 8 and then attached to the sticking drum.

2. Molding Method of Tire Constituent Material The tire constituent material molding method of the present embodiment is a method in which the center line printing apparatus 1 is used and the breaker 9 is pasted to the pasting drum while being centered.

(1) The breaker 9 is cut to a predetermined breaker width W1 by a cutting machine of the cutting device 6 disposed on the upstream side of the centerline printing device 1 as shown in FIG. The cut breaker 9 after being cut is fed into the downstream crimping device 7 by the transport conveyor 60 of the cutting device 6. In the crimping device 7, the leading end portion of the cut breaker 9 that has been fed is crimped to the rear end portion of the preceding breaker 9 by a crimping machine, and the two are connected.

(2) The breaker 9 connected to the preceding breaker is fed to the downstream center line printing device 1 by the transport conveyor 70 of the crimping device 7 and is transported by the transport conveyor 2, while the breaker 9 is moved by the centering mechanism 3. Centered in the width direction.

(3) Thereafter, the raw rubber 92 of the breaker 9 is thermally changed (or chemically reacted) by the laser light L emitted from the printing machine 4 while being transported by the transport conveyor 2, and the breaker 9 A center line 94 extending in the longitudinal direction is printed at the center.

(4) The breaker 9 on which the center line 94 is printed is further transported by the transport conveyor 2, and the covering sheets 10a and 10b supplied from the covering sheet pasting device 5 to the left and right ends thereof are the covering sheet pasting device. 5 is pasted by the pasting mechanism.

(5) The breaker 9 to which the covering sheets 10 a and 10 b are attached is wound up by the winding device 8.

(6) The wound breaker 9 is formed by sticking the center line 94 printed by the laser on the sticking drum so that the center line 94 coincides with the center position of the sticking drum. Specifically, for example, a centering laser beam (not shown) is applied to the center of the sticking drum, and the center line of the breaker 9 is aligned with the laser light irradiation position while the breaker 9 is centered, A breaker 9 is pasted.

(7) In addition, the determination as to whether or not the center of the pasting drum and the center line 94 of the breaker 9 after the pasting is performed efficiently is performed using camera measurement. That is, it is determined how much the area of the center line 94 is within the camera measurement range while the center line 94 of the breaker 9 pasted on the pasting drum goes around. For example, if the area of the center line 94 is 500 pixels or more (threshold value can be arbitrarily set) within a rectangular camera measurement range of 8 pixels (about 3.2 mm) × 244 pixels (about 97.6 mm), If the center line 94 of the breaker 9 is not deviated, or conversely less than that, it is determined that the breaker 9 has shifted or meandered.

(8) In the above embodiment, the breaker 9 to which the covering sheets 10a and 10b are attached is once wound up by the winding device 8, but is directly attached without being wound around the winding device 8. You may affix on a drum and shape | mold.

3. Advantages of the present embodiment (1) According to the present embodiment, the center line 94 is printed in a non-contact manner in order from the centering mechanism 3 of the center line printing device 1 in order from the upstream side to the downstream side of the conveyor 2. Since the printing machine 4 and the covering sheet sticking device 5 are disposed, the center line 94 can be printed on the breaker 9 before the covering sheets 10a and 10b are stuck.

(2) When the tire is molded, the breaker 9 can be affixed on the affixing drum based on the center line 94 printed accurately without being affected by the covering sheets 10a and 10b.

(3) For this reason, the covering sheets 10a and 10b are not adversely affected, and as a result, the breaker 9 can be accurately affixed on the affixing drum, the off-center of the breaker can be suppressed, and the tire conicity is reduced. can do.

(4) Further, since printing is performed by irradiation with the laser beam L (in a non-contact manner), no mechanical wear or impact is applied to the breaker 9, so that the breaker 9 is not easily damaged or the center line 94 is not displaced. . Moreover, since no organic solvent is used, there is almost no burden on the natural environment.

(5) Since the centering laser beam is applied to the center of the sticking drum as described above and the breaker 9 is stuck to the sticking drum, the center line 94 of the breaker 9 is accurately and easily attached to the center of the sticking drum. Can be matched.

(6) Further, the tire has a determination process by an efficient and quick method for determining whether the center of the sticking drum and the center line of the breaker coincide with each other as measured by the camera as described above. The conicity of can be further reduced.

1. Evaluation of Conicity Value (CON Value) In this example, a breaker 9 with covering sheets 10a and 10b on which a center line 94 was printed was created using the center line printing apparatus 1 of the above-described embodiment. It is the example which shape | molded the tire using.

  The comparative example is an example in which a tire is molded using only the centering guide of the breaker 9 with covering sheets 10a and 10b without forming a center line.

  About the Example and the comparative example, 1000 tires were produced and the conicity value, the standard deviation, and the OUT rate (defective rate) were obtained.

  From Table 1, the CON value of “Example” is 4.8, which is smaller than 5.3 of “Comparative Example”, and the standard deviation of “Example” is 15.4. In comparison with 28.3, the tire defective rate (OUT rate) was significantly reduced from 16.5% of the comparative example of the conventional method to 1.3% under good production control.

2. Evaluation of Printing Machine (1) The embodiment is an example in which the center line 94 is printed by a laser type printing machine. Comparative Example 1 is an example in which the center line 94 is printed with a pen-type printer. Comparative Example 2 is an example in which the center line 94 is printed by a needle type printing machine.
(2) About the Example and the comparative example, the line shift | offset | difference of the center line, the damage to a breaker (product), and the load to natural environment were evaluated.

Table 2 shows the evaluation results for three types of printing machines. In Table 2, in order of superiority, “◎”, “◯”, “Δ”, and “×” are shown in this order.

  From Table 2, it was confirmed that the laser type printing machine (printing machine of “Example”) that prints the center line 94 on the breaker 9 in a non-contact manner is excellent in all evaluation items.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiments within the same and equivalent scope as the present invention.

1 Centerline printing device 2 Conveyor (conveying means)
3 Centering mechanism 4 Printing machine 5 Covering sheet sticking device 6 Cutting device 7 Crimping device 8 Winding device 9 Breaker (tire component material)
10a, 10b Covering sheets 30a-32b Guide pin 40 Laser light oscillator 50 Shaft shaft 52a, 52b Covering sheet supply wheel 60, 70 Conveyor 90 Code 92 Raw rubber 94 Center line L Laser light W1 Breaker width W2 Center line width d Center line Depth θ Breaker angle

Claims (5)

Conveying means for conveying the long tire constituent material in the longitudinal direction;
A printing machine for printing a center line in a non-contact manner at a center position of the tire constituent material;
A centering mechanism that causes the center position of the tire constituent material to coincide with the print position of the printing machine while transporting the tire constituent material by the transport means,
A centerline printing apparatus for a tire constituent material, wherein the printing machine is disposed upstream of a covering sheet sticking apparatus for attaching a covering sheet to both side ends of the tire constituent material.   2. The center line printing device for tire constituent materials according to claim 1, wherein the printing machine is configured to print the center line by irradiating the tire constituent materials with laser light. A centering step for centering the tire constituent materials;
A printing step for printing a center line in a non-contact manner at a center position of the centered tire constituent material;
A covering sheet attaching step of attaching a covering sheet to both ends of the tire constituent material on which the center line is printed;
A molding step in which the center line of the tire constituent material to which the covering sheet is attached is aligned with the center position of the sticking drum, and the tire constituent material is attached to the sticking drum. A method for forming a tire constituent material.   In the molding step, the centering laser beam is applied to the center of the sticking drum, the center line of the tire constituent material is made to coincide with the irradiation position of the laser light, and the tire constituent material is attached to the sticking drum. The method for forming a tire constituent material according to claim 3.   After the tire constituent material is affixed to the affixing drum, the breaker on the affixing drum is measured with a camera over the entire circumference, and the center line of the breaker is within a predetermined area within the measurement range of the camera The method for molding a tire constituent material according to claim 3 or 4, further comprising a determination step of determining that the center of the sticking drum and the center line of the breaker coincide with each other.

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