JP4646385B2 - Target line forming method and apparatus for tire molding sheet member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, when molding the green tire, the surface of the tire building sheet member, in the production process or post-process of the sheet member, to an apparatus for use in the methods and the method of forming a target line required .
[0002]
[Prior art]
In the green tire molding process, when bonding tire molding sheet members such as carcass plies on the molding drum, it is important to increase the relative positional accuracy between the sheet members in order to increase the green tire molding accuracy. Since the desired dimensional accuracy of the product tire can be obtained by improving the molding accuracy, it is necessary to accurately align the sheet members when they are bonded to each other.
[0003]
As a technique for making this alignment accurate, it has been conventionally known that a target line is formed in advance in each tire molding sheet member in a production process or a subsequent process of the tire molding sheet member.
[0004]
For example, as shown in FIG. 4, for example, a tire 12 is operated by operating a conveyor 12 on which a tire molding sheet member 11 is placed, and an overheated wheel 13 having a large number of chevron protrusions around the tire. There is a method of forming a perforated depression by causing a tire molding sheet member 11 to have an insertion mark by a chevron by pressing and rotating along a predetermined position on the surface of the member 11.
[0005]
[Problems to be solved by the invention]
However, the perforated depressions attached to the surface of the tire molding sheet member are difficult to confirm the presence by visual inspection of the operator, and it is difficult to detect the target line by the camera. There was a problem that the re-sticking work occurred and the working efficiency at the time of green tire molding was poor.
[0006]
Therefore, in order to more accurately recognize the target line when the sheet metal members are bonded to each other, a white cement solution different from the color of the surface of the tire molding sheet member is applied to the surface and the target line is formed. Another approach has been proposed. Target line formed by this approach, led directly sheet surface a coating solution, because you have to pull the target line, causes the width of the target line is relatively large front and rear 3 mm, this is because, vulcanization There is a concern that the coating agent may remain on the surface of each member of the tire later, and in the product tire, there is a problem in that each member of the tire is peeled off and durability is lowered.
[0007]
The present invention aims to solve such problems of the prior art,
The first purpose is to improve the efficiency of molding workability by accurately detecting the target line formed on the surface of the tire molding sheet member when bonding the tire molding sheet member on the molding drum. Another object of the present invention is to provide a method for forming a target line on a tire molding sheet member and an apparatus used for this method.
And has as a second object, the Note to achieve the first object, to prevent a reduction in durability of the product tire to advantageously avoid the separation of tire components to each other, the goal of the tire molding seat member An object of the present invention is to provide a line forming method and an apparatus used for the method.
[0008]
[Means for Solving the Problems]
The method for forming a target line on the tire molding sheet member according to the present invention detects the movement amount of the tire molding sheet member under the operation of the conveyor on which the tire molding sheet member is placed, and for each predetermined movement amount. The printing unit applies a coating agent having a color different from the color of the surface to the surface of the tire molding sheet member in a dot shape, and the dot diameter is set to 0.8 mm or more and 2.0 mm or less.
[0009]
In this method for forming a target line on a tire molding sheet member, a coating drum that forms a target line at the time of tire molding is applied to the surface of the tire molding sheet member in the form of dots, thereby forming a molding drum for the tire molding sheet member. At the time of pasting, it is possible to accurately detect the target line formed on the surface of the tire molding sheet member, thereby improving the green tire molding workability.
[0010]
In addition, here, by setting the dot diameter to 0.8 mm or more, the target line formed on the surface of the tire molding sheet member is more accurately detected, and by setting the dot diameter to 2.0 mm or less, the coating agent can be used inside the tire member. By sufficiently absorbing and diffusing, it is possible to advantageously avoid the separation of the tire members after vulcanization, thereby preventing the durability of the product tire from being lowered.
The color of the coating agent is different from that of the tire molding sheet member.
[0011]
This target line forming method of the tire molding seat member, and to form a target line and dot the coating agent applied from the printing unit to a sheet member for a tire molded in diameter below 2.0m or 0.8m Therefore, two different problems of improving the detection accuracy of the target line and preventing separation of the tire members can be achieved at the same time.
[0012]
More preferably the target line forming method for such a tire molding sheet member, a coating agent, a white cement solutions in rubber volatilization to a rubber composition comprising a 7-10 wt%, more preferably the composition Is blended with 100 parts by weight of natural rubber, 5-30 parts by weight of titanium oxide, 10-50 parts by weight of silica, 0.5-8.0 parts by weight of silane coupling agent, and other vulcanizing agents and accelerators. Shall.
Here, the rubber composition has advantages such as no influence on the tire durability performance, whiteness sufficient for detection of the target line, good kneading workability, leaving stability and the like.
[0013]
Preferably, the dot pitch of the coating agent is 2.0 mm or greater and 10.0 mm or less.
According to the target line forming method for such a tire molding seat member, it is set to lower than or equal to 10.0mm dot pitch, during drum rotation detection of target line pasted tire molding seat member to the molding drum it is possible also to ensure, by a 2.0mm or more, liable to absorb and spread the coating material inside the tire member, the advantageously avoided to a product tire separation of tire components between the vulcanized durability The fall of property can be prevented.
[0014]
Target line forming device to a tire molding sheet member according to the present invention comprises a con bare-operating by placing a sheet member for a tire molding, and a detector for detecting the amount of movement of the tire molding sheet member, the detection And a printing unit having a nozzle for applying a coating agent in the form of dots on the surface of the tire molding sheet member for each predetermined movement amount according to the detection result of the container. .2 mm or less.
[0015]
The target line forming device to the tire building sheet member, the tip inner diameter of the nozzles constituting the printing unit by a least 0.1 mm, thereby reliably forming dots on the surface of the tire building sheet member, the By setting the inner diameter of the tip to 0.2 mm or less, it is possible to reliably form dots with a predetermined diameter.
[0016]
Described above, and more preferably in the target line forming device to a tire molding sheet member, a printing unit, a coating agent passage for feeding the coating material to the nozzle, the valve body that controls the opening and closing of the nozzle to the coating material passage And a cleaning liquid passage communicating with the tip of the nozzle, and a liquid discharge port positioned below the cleaning liquid passage and aligned with the nozzle.
Further, preferably, a receiving tray for the cleaning liquid is disposed on the side of the conveyor so that the printing unit and the receiving tray can be displaced relative to each other up and down.
[0017]
According to this, when outages printing unit, an opening near the portion of the cleaning liquid passage of the nozzle, the nozzle portion near the cleaning liquid passage, it is a liquid discharge port for drying or coating agent is deposited, on their part As a result, there is a concern that the desired application of the coating agent to the tire molding sheet member may not be realized during the next operation of the printing unit. By cleaning the vicinity of the nozzle of the cleaning liquid passage and the liquid discharge port, it is possible to advantageously prevent the above-mentioned parts from being dried or the coating agent from adhering or remaining when the printing unit is stopped. Repeated use can be reliably realized.
[0018]
For this cleaning, a cleaning liquid tray is disposed on the side of the conveyor, and after the printing unit and the receiving tray are displaced to the upper and lower relative positions, the cleaning liquid is poured into the cleaning liquid passage so that The intended cleaning can be performed.
Incidentally, after the above washing, by blowing air into the cleaning liquid passage, it is possible to drive out the complete cleaning liquid from the printing unit, whereby it is possible to completeness with respect to next use of the printing unit.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing a tire molding sheet member and an apparatus used for carrying out a target line forming method on a tire molding sheet member according to the present invention at the time of target line formation of the apparatus, In the figure, 1 is a tire molding sheet member (for example, carcass ply), 2 is a conveyor, 3 is an encoder, 4 is a printing unit, and 5 is a tray.
[0020]
Further, as shown in FIG. 2, the printing unit 4 constituting the target line forming apparatus according to the present invention includes a coating agent passage 4b for feeding a coating agent to the nozzle 4a, and opening and closing of the nozzle 4a with respect to the coating agent passage 4b. Formed by a valve body 4c that controls the cleaning fluid passage 4d that communicates with the tip of the nozzle 4a, and a liquid discharge port 4e that is positioned below the cleaning fluid passage 4d and is aligned with the nozzle 4a, and a side portion of the conveyor 2 A receiving tray 5 for the cleaning liquid is disposed on the printing unit 4 so that the printing unit 4 and the receiving tray 5 can be displaced relative to each other up and down.
In FIG. 2, the portion of the cleaning liquid passage 4d that extends in the horizontal direction is located between the nozzle 4a and the liquid discharge port 4e, but this portion of the horizontal extension extends from the position illustrated in FIG. Can also be provided above. Further, an air vent hole is provided in the coating agent passage 4b, and a valve (not shown) is closed except when the coating agent is removed.
[0021]
Here, each process is demonstrated sequentially about the target line formation method to the sheet | seat member for tire shaping | molding concerning this invention.
The printing unit 4 is moved above the tire molding sheet member 1 by a movable means (not shown) and arranged at a predetermined position.
Next, the tire molding sheet member 1 is placed on the conveyor 2 and the conveyor 2 is operated. The encoder 3 attached to the side of the conveyor 2 moves the tire molding sheet member 1 by an amount of movement. Detecting this, while moving the tire molding sheet member 1, the white cement solution as the coating agent is communicated with the coating agent passage 4b of the printing unit 4 through the coating agent passage 4b and the cleaning fluid passage 4d to reduce the inner diameter of the tip. The dot diameter is applied to a predetermined position on the surface of the tire molding sheet member 1 from the nozzle 4a with a dot diameter of 0.8 mm to 2.0 mm.
Here, the coating agent is discharged from one nozzle 4a, and the remaining three are used as spares. Moreover, you may use so that 4 may be applied by shifting time.
The application amount of the white cement solution is controlled by opening and closing the valve body 4c, and the white cement solution is in a pressurized state when the white cement solution is injected into the coating agent passage 4b.
[0022]
The above-described operation of the conveyor 2 with the tire molding sheet member 1 placed thereon and the application of the white cement solution by the printing unit 4 are continuously performed to form the target line of the tire molding sheet member 1. Complete within the expected range.
[0023]
After completion of the series of operations described above, the printing unit 4 is dried to the vicinity of the opening of the nozzle 4a to the cleaning liquid passage, the vicinity of the nozzle of the cleaning liquid passage 4d, and the liquid discharge port 4e, or white to these portions. FIGS. 3 (a) to 3 (c) show the cleaning of the respective parts 4a, 4d, and 4e of the printing unit 4 in order to prevent the cement solution from adhering and remaining and smooth the next use of the printing unit 4. It explains according to.
The example shown in FIG. 3 shows a case where the number of nozzles 4a is one, but in the case where there are two or more nozzles, such cleaning is similarly performed from the following steps.
[0024]
That is, as shown in FIG. 3 (a), after forming a predetermined target line, as shown in FIG. 3 (b), the positions of the liquid discharge port 4e of the printing unit 4 and the tray 5 are matched,
A cleaning liquid, for example, rubber volatile oil is poured into the cleaning liquid passage 4d, and then air is blown into the cleaning liquid passage 4d as shown in FIG. 3 (c), whereby the cleaning liquid scatters outside from the liquid discharge port 4e of the printing unit 4 etc. Is received by the tray 5 and the cleaning is performed.
[0025]
As described above, the printing unit 4 has a portion near the opening of the nozzle 4a to the cleaning liquid passage 4d, a portion near the nozzle of the cleaning liquid passage 4d, and the liquid discharge port 4e. It is advantageous to repeatedly and reliably perform the intended use of the printing unit 4, and thus the device according to the present invention, advantageously preventing the drying of the respective parts or the adhesion / residual of the white cement solution to them during the operation stop. Can do.
[0026]
【The invention's effect】
According to the present invention, at the time of bonding the tire molding sheet member on the molding drum, the detection of the target line formed on the surface of the tire molding sheet member is accurately performed to improve the efficiency of the molding operation, and the small diameter By sufficiently absorbing and diffusing the dot-shaped coating agent into the tire molding sheet member, it is possible to advantageously avoid peeling of the vulcanized evening member and prevent deterioration of the durability of the product tire be able to.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a tire molding sheet member and an apparatus used for carrying out a method for forming a target line on a tire molding sheet member according to the present invention when the target line of the apparatus is formed.
FIG. 2 is a longitudinal sectional view showing an internal structure of the printing unit shown in FIG.
FIG. 3 is a vertical cross-sectional view illustrating printing unit cleaning divided into steps.
[Figure 4] and the sheet member for a tire molding, and a device to be used in the practice of the target line forming method of the conventional tire molding seat member by means of using the wheel, perspective view showing the time target line formation of the device It is.
[Explanation of symbols]
1,11 Tire molding seat
2, 12 conveyor
3 Encoder
4 Printing unit
4a nozzle
4b Coating agent passage
4c Disc
4d Cleaning fluid passage
4e Liquid outlet
5 saucer
13 wheels

Claims (7)

Under the operation of the conveyor on which the tire molding sheet member is mounted, the movement amount of the tire molding sheet member is detected, and the tire molding is performed on the surface of the tire molding sheet member by the printing unit for each predetermined movement amount. A method for forming a target line on a sheet member for molding a tire, in which a coating agent serving as a target line at the time is applied in a dot shape, and the dot diameter is 0.8 mm or more and 2.0 mm or less. The method for forming a target line on a tire molding sheet member according to claim 1, wherein the coating agent is a white cement solution in which the rubber composition is dissolved in rubber volatil so as to be 7 to 10% by weight. The rubber composition is added to 100 parts by weight of natural rubber, 5 to 30 parts by weight of titanium oxide, 10 to 50 parts by weight of silica, 0.5 to 8.0 parts by weight of a silane coupling agent, other vulcanizing agents, and vulcanization acceleration. The method for forming a target line on the tire molding sheet member according to claim 2, wherein an agent is blended. The method for forming a target line on a tire molding sheet member according to any one of claims 1 to 3, wherein a dot pitch of the coating agent is 2.0 mm or more and 10.0 mm or less. The conveyor for operating the tire molding sheet member, the detector for detecting the movement amount of the tire molding sheet member, and the tire molding sheet member for each predetermined movement amount according to the detection result of the detector. An apparatus for forming a target line on a tire molding sheet member, comprising a printing unit having a nozzle for applying a coating agent in a dot shape on a surface thereof, wherein a tip inner diameter of the nozzle is 0.1 mm or more and 0.2 mm or less. The printing unit is located below the cleaning liquid passage, a coating path for supplying the coating liquid to the nozzle, a valve body that controls opening and closing of the nozzle with respect to the coating path, a cleaning liquid path that communicates with the tip of the nozzle. The target line forming device for a tire molding sheet member according to claim 5, comprising a liquid discharge port aligned with the nozzle. 7. A target line forming apparatus for a tire molding sheet member according to claim 5, wherein a receiving tray for the cleaning liquid is disposed on a side of the conveyor, and the printing unit and the receiving tray can be relatively displaced up to a relative position in the vertical direction. .

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