JP2010264627A - Method and apparatus for detecting inner liner joint, and method for manufacturing green tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a green tire causing no joint dispersion failure by conveying a primary molded green tire to a secondary molding apparatus in an accurate position of an inner liner joint, and to provide a method and apparatus for detecting the inner liner joint required for the method. <P>SOLUTION: The method for detecting the inner liner joint includes a carry-in step for carrying in the primary molded green tire formed with an inner liner and placing it on a rotating means having a drive roller; a detector insertion step for inserting a joint detector having two presser rollers and a distance sensor, on the inner surface side of the primary molded green tire and fixing the joint detector into a position facing the drive roller; a rotating step for rotating the primary molded green tire by driving of the drive roller in a state of the presser rollers and the drive roller abutting on the primary molded green tire; and a detecting step for measuring a distance between the distance sensor and the inner liner by the distance sensor every predetermined time to detect the position of the inner liner joint. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a detection method and a detection device for a joint position of an inner liner used in a manufacturing process of a raw tire, and a manufacturing method of a raw tire.

  In the manufacture of tires, an inner liner (IL) and a carcass ply (PLT) are pasted on a molding drum (primary molding) to form a primary molded green tire, and a sidewall (SW), breaker ( BRK), a jointless band (JLB), a tread (TL), and the like are laminated (secondary molding) to form an unvulcanized tire (raw tire). Thereafter, the obtained raw tire is put into a mold, and is vulcanized by heating while being pressed against a molding surface by shaving using a bladder or the like to obtain a product tire.

  Since the above-mentioned IL, PLT, SW, BRK, JLB, and TL are provided in the form of a band-shaped material, it is necessary to joint both ends of the material. Therefore, in the raw tire, each joint portion (in JLB) Is the location at the beginning and end of winding, which will be described below as a joint part).

  On the other hand, the improvement of the uniformity of product tires has been conventionally studied (for example, Patent Document 1). For this reason, from the viewpoint of improving the uniformity of the product tire, for example, as shown in FIG. 6, it is preferable that the positions of these joint portions (joint positions) are arranged without being unevenly distributed. (Distribution of joints). If the joint dispersion is poor, the product tires will have a force variation, which will worsen the uniformity.

  In order to distribute the joints, it is necessary to determine the reference joint and its position and provide other joints based on the determined joint. Generally, the position of the inner liner joint (IL joint) is used as a reference. . This is because the IL joint is formed first when the green tire is molded.

  The molding of a green tire based on the position of the IL joint is displaced when the primary molding and the secondary molding are performed directly on the tire molding drum directly like a single molding machine or the like. However, there is a problem that the position of the IL joint may be shifted in normal green tire molding in which the primary molded green tire is conveyed by a conveyor and subjected to secondary molding.

  That is, during conveyance by the conveyor from the primary molding device to the secondary molding device, the primary molded green tire contacts the conveyor frame, or depending on the weight of the primary molded green tire, the rolling direction on the conveyor roller may change. As a result, a shift occurs in the position of the IL joint. In addition, the primary molded green tires may be in close contact with each other during conveyance, and the position of the IL joint may be displaced.

  If the secondary molding is performed in a state in which the position of the IL joint is shifted, other joint positions cannot be provided at predetermined positions. As a result, poor joint dispersion occurs, resulting in a product tire with reduced uniformity. For this reason, it is necessary to specify the position of the IL joint prior to the secondary molding.

  By the way, regardless of the displacement of the above-mentioned IL joint, it is advantageous in operation to stock as many primary molded raw tires as possible on the conveyor between the primary molding device and the secondary molding device in the factory. is there. For this reason, there is an introduction of equipment capable of storing twice as much stock by making the conveyor two stages up and down.

  However, since there are many restrictions on the installation of two upper and lower conveyors due to the structure of buildings and equipment, two horizontal conveyors have also been proposed. However, in this case, the transfer operation of the primary molded green tire between the conveyors is added, so that the displacement of the position of the IL joint is further increased and the joint is poorly distributed.

  As described above, there is a restriction on the structure of the conveyor with respect to the improvement of productivity.

JP-A-10-86240

  In view of solving the above-mentioned problems, the present invention provides a method for producing a green tire in which a primary molded green tire is carried into a secondary molding apparatus at an accurate position of an inner liner joint, and no poor joint dispersion occurs, and the green tire It is an object of the present invention to provide an inner liner joint detection method and detection apparatus necessary for carrying out the manufacturing method.

  In addition, by detecting the position of the inner liner joint formed on the primary molded green tire, it is possible to produce a green tire that can obtain a product tire with good uniformity without being restricted by the structure of the conveyor. It is an object of the present invention to provide a method for manufacturing a raw tire that can be manufactured highly.

The inner liner joint detection method according to the present invention includes:
An inner liner joint detection method for detecting a position of an inner liner joint provided in a primary molded green tire,
A carry-in step of carrying in the primary molded green tire on which the inner liner is formed and placing it on a rotating means having a drive roller;
A detector insertion step of inserting a joint detector having two press rollers and a distance sensor into the inner surface side of the primary molded green tire and fixing the joint detector at a position facing the drive roller;
A rotating step of rotating the primary molded green tire by driving the drive roller in a state where the press roller and the drive roller are in contact with the primary molded green tire;
And detecting a position of the inner liner joint by measuring a distance between the distance sensor and the inner liner every predetermined time by the distance sensor.

In addition, the inner liner joint detection device according to the present invention,
An inner liner joint detection device for detecting the position of an inner liner joint provided in a primary molded green tire,
Carrying-in means for carrying in the primary molded green tire formed with the inner liner and placing it on a rotating means having a drive roller;
A detector insertion means for inserting a joint detector having two pressing rollers and a distance sensor into the inner surface side of the primary molded green tire and fixing the joint detector at a position facing the drive roller;
Rotating means for rotating the primary molded green tire by driving the drive roller in a state where the press roller and the drive roller are in contact with the primary molded green tire,
The distance sensor includes a detecting unit that measures the distance between the distance sensor and the inner liner at predetermined time intervals and detects the position of the inner liner joint.

Furthermore, the method for producing a green tire according to the present invention includes:
Using the inner liner joint detection device, after fixing the position of the inner liner joint detected by the inner liner joint detection method at a predetermined position on the molding former of the secondary molding device,
A raw tire is formed by setting a relationship between a winding end position and a winding start position of a side wall joint, a breaker joint, a tread joint, and a jointless band at a predetermined interval.

  ADVANTAGE OF THE INVENTION According to this invention, the position of the inner liner joint of the primary shaping | molding green tire carried in to a secondary shaping | molding apparatus can be detected reliably and easily. In addition, because the secondary molding device forms a joint such as a sidewall based on the detection result, the primary molded green tire can be carried into the secondary molding device at an accurate position of the inner liner joint, and many The joint can be dispersed stably. As a result, a tire having a stable quality (uniformity) can be manufactured.

  Further, according to the present invention, the primary molded green tire can be carried into the secondary molding device at an accurate position of the inner liner joint without being restricted from the structure of the conveyor. A product tire with good uniformity can be obtained with high productivity by means of a horizontal two-row type conveyor or the like that has a large amount of stock and few restrictions on equipment.

It is a figure which shows typically the process in which a primary molded green tire is conveyed to the detection apparatus of an inner liner joint in embodiment of this invention. It is the front view and perspective view which show typically the outline | summary of the detection apparatus of the inner liner joint of embodiment of this invention. It is a figure explaining the detection mechanism of the inner liner joint in embodiment of this invention. It is a figure which shows typically the outline | summary of the manufacturing process of the raw tire of embodiment of this invention. It is a figure which shows typically the shaping drum in which the raw tire provided with the sidewall is set. It is a figure which shows typically an example of the preferable positional relationship of the joint position of the various members of a green tire.

  Hereinafter, the present invention will be described based on embodiments. Note that the present invention is not limited to the following embodiments. Various modifications can be made to the following embodiments within the same and equivalent scope as the present invention.

  The present embodiment detects the joint position of the inner liner of the primary molded green tire in the production of the green tire, and also the inner liner (IL), carcass ply (PLT), sidewall (SW), breaker (BRK), Joint positions of various members such as a jointless band (JLB) and tread (TL) (in the case of a jointless band, this refers to “the position of the end of winding and the start of winding”, but for convenience of description, the description is not complicated. The present invention relates to a raw tire manufacturing method in which joint positions are distributed so that the positional relationship of the joints of the various members becomes a predetermined interval by index management.

1. Detection of the joint position of the inner liner (1) Transport of the primary molded green tire to the detection device First, the transport of the primary molded green tire wound with the inner liner and carcass ply to the detection device will be described with reference to FIG. To do.

  FIG. 1 is a diagram schematically showing a process of transporting a primary molded green tire to a detection device for an inner liner joint in the present embodiment. As shown in FIG. 1, the primary molded green tire A is transported by the transport device 1 to the inner liner joint detection device 2. The conveyance device 1 includes stock conveyors 11 and 12 that are arranged in two horizontal rows and are freely reversible, a delivery unit 13 that reciprocates between the conveyors 11 and 12, and a short roller conveyor 14. In FIG. 1, only one primary molded green tire is shown on each of the conveyors 11 and 12 for convenience of understanding. However, in order to improve productivity, it is preferable to stock a plurality of primary molded green tires. .

  The short roller conveyor 14 has a tip inclined obliquely downward, and after the primary molded raw tire A sent from the conveyors 11 and 12 is moved up to the short roller conveyor 14 by the delivery unit 13, It is dropped from the front end of the conveyor 14 as shown by an arrow A and is carried into the inner liner joint detecting device 2 to detect the joint. The primary molded green tire A that has finished detecting the joint is conveyed to the next process. 31 is a former used in the next step.

(2) Detection of Joint of Inner Liner Next, detection of the joint of the inner liner will be described with reference to FIGS.

I. FIG. 2 is a drawing schematically showing the outline of the inner liner joint detection device of the present embodiment, where (a) is a front view and (b) is a perspective view. As shown in FIG. 2, the inner liner joint detection device 2 includes two press rollers 23 (free rollers) and a distance sensor 24 (for example, an infrared sensor) that measures the distance to the inner peripheral surface of the inner liner B. A joint detector 25 having a pair of left and right rollers that can be opened and closed in the lateral direction, specifically, a rotating means having a drive roller 21 and a free roller 22, an arithmetic unit 26, and a joint detector 25. Fluid pressure cylinders 27 and 28 for entering the inner side of the tire and then lowering it to contact the inner surface of the primary molded green tire A. The drive roller 21 is connected to a motor M (drive source) via transmission means (not shown), and the drive source 28 is controlled by a control unit 29. Reference numeral 26 denotes an arithmetic unit.

B. Detection Method The primary molded green tire A carried into the inner liner joint detection device 2 is placed on the drive roller 21 and the free roller 22, and the fluid pressure cylinder 27 is extended to connect the joint detector 25 to the primary molded green tire A. After entering horizontally, the fluid pressure cylinder 28 is lowered by extending, and both sides of the contact portion with the drive roller 21 of the primary molded green tire A are brought into contact with the press roller 23.

  In this state, while rotating the drive roller 21 to rotate the primary molded green tire A, the distance sensor 24 makes contact with the inner peripheral surface of the primary molded green tire A every predetermined time, for example, every 50 milliseconds (ms). Measure the distance. At this time, the position of the joint of the inner liner is detected by detecting the variation of the distance. In the above method, since the distance measurement is performed by contacting both sides of the contact portion between the primary molded green tire A and the drive roller 21 with the presser roller 23, the joint of the inner liner is surely not affected by wrinkles or the like. Can be detected.

  Next, the method for detecting the joint of the inner liner will be specifically described with reference to FIG. FIG. 3 is a view for explaining the detection mechanism of the inner liner joint in the present embodiment. 3, (a) is an enlarged view of the vicinity of the joint B1 of the inner liner B of the primary molded green tire A, and (b) is an enlarged view of the vicinity of the joint C1 of the carcass ply C. A raised portion B2 is formed by an inner liner B on the upper surface of C1. In FIG. 3, the primary molded green tire A is shown on a plane for easy understanding.

  The distance from the distance sensor 24 to the inner peripheral surface of the rotating inner liner B is constant at a location without the joints B1 and C1. However, when the joint B1 or the raised portion B2 comes to the distance measurement site by the distance sensor 24, the measurement value varies. At this time, the fluctuation of the measurement value is gentle because the slope is gentle at the bulging portion B2 of (b), whereas the fluctuation of the measurement value is sharp because there is a large step at the joint B1 of (a). . For this reason, it is possible to detect the joint B1 of the inner liner B by measuring the movement distance of the inner liner B at a sufficiently small time interval and reading the fluctuation of the abrupt distance exceeding a predetermined value by the calculation unit 26. For example, in the case of a normal inner liner B, when the speed of the inner liner B passing through the distance measurement position is 7 m / min and the measurement interval is 50 ms, the difference between two consecutive measurement values is 0.5 mm or more. In this case, it is determined that the distance fluctuates rapidly, and the joint B1 of the inner liner B is detected.

  And if joint B1 is detected, a detection signal will be output to the control part 29, and rotation of the primary shaping | molding green tire A will be stopped. On the other hand, when the difference between the two consecutive measurement values is small, the rotation of the primary molded green tire A is continued with a gradual change.

(3) Index of joint position of inner liner As described above, when the position of the joint of the inner liner is detected, the rotation of the primary molded green tire A is stopped based on the detection signal of the joint B1 of the joint detection device 2. Then, the joint B1 of the inner liner B of the primary molded green tire A is indexed.

  Thus, according to the present embodiment, in order to detect the position of the joint of the inner liner and perform indexing, for example, the primary molded raw tire A is transported by a conveyor or the like, and the position of the joint of the inner liner in the transport process is Even in the case of a change, the position of the joint of the inner liner can be reliably grasped, and the positional relationship of the joints of the various members described above can be reliably and easily controlled in the subsequent steps.

  After completing the index of the joint B1, the joint detector 25 is raised and further pulled back to the outside of the primary molded green tire A, and the joint detector 25 and the primary molded green tire A are separated. Thereafter, by opening the drive roller 21 and the free roller 22, the primary molded raw tire A is dropped and carried out from the joint detection device 25 toward the next process.

2. Sidewall Affixing Step The primary molded green tire for which the detection of the joint of the inner liner has been completed is conveyed to the sidewall affixing step, and the sidewall is affixed to the primary molded green tire. Hereinafter, a description will be given with reference to FIG.

  In FIG. 4A, after the index of the joint of the inner liner is completed and the primary molded green tire A carried out from the joint detector is transferred to the insertion bucket, the former of the side wall sticking device 3 in FIG. 31 (usually referred to as a 3rd stage former) is collated with the joint position of the indexed inner liner provided on the primary molded green tire A (3rd stage former). Mer insertion index management), set to the former 31 of the side wall sticking device 3 in a skewered state, and stick the side wall D to the outer periphery.

  By performing the 3rd stage former insertion index management in this way, the mutual positional relationship among the inner liner, the carcass ply and the side wall joint can be reliably controlled.

(2) Removal and transportation of raw tire provided with side wall Next, in (c), under the management of the 3rd stage former take-out index, the raw tire E with side wall provided with the sidewall is provided from the side wall application device. The sheet is taken out and conveyed to a secondary molding apparatus by a conveying device (case conveying conveyor) not shown.

  This conveying device is composed of a conveyor that also serves as a stock of a plurality of (for example, seven) raw tires with sidewalls E, and is conveyed by the handling device from the end of the conveyor. Set on the shaping drum 43. In addition, in order to take out the raw tire E with the sidewall under the take-out index management in (c) as described above, the joint position of the inner liner or the like is easily controlled in (d) in (d). Can be set on the shaping drum 43.

3. Secondary forming step In the secondary forming step, a green tire F is manufactured from a green tire E with sidewalls. The secondary molding device 4 includes a belt drum 41, a belt transfer 42, a shaping drum 43, and a stitcher device 44 that are arranged on the same axis, and produces a raw tire F from a raw tire E with a sidewall.

(1) Setting of raw tire with sidewall on shaping drum The raw tire with sidewall E is set on the shaping drum 43 in a state where the joint position of the inner liner or the like is controlled. FIG. 5 schematically shows the shaping drum 43 on which the side wall-equipped raw tire E is set.

(2) Attaching various members to the green tire with sidewall As shown in FIG. 4, the green tire E with sidewall set on the shaping drum 43 is docked with the belt transfer 42, and the raw tire E with sidewall is After the members such as the first and second breakers, the jointless band, and the tread are supplied and mounted under the management of the take-out index on the belt side, the stitching is completed by the stitcher device 44, and the raw tire F is manufactured.

(3) Positional relationship of joints of various members of the produced raw tire FIG. 6 is a diagram schematically illustrating an example of a preferable positional relationship of joint positions, winding start and winding end of various members of the raw tire. In the present embodiment, the secondary molded green tire E is set on the shaping drum 43 in a state where the joint position of the inner liner or the like is controlled as described above, and further, the member is under the control of the take-out index on the belt side. To supply the inner liner joint position (IL), breaker joint position (BRK), sidewall joint position (SW), carcass ply joint position (PLT), jointless band winding end as shown in FIG. It is possible to stably manufacture a raw tire in which the positional relationship between the winding start position (JLB) and the tread joint position (TL) is controlled at a preferable interval.

4). Operational effects of the present embodiment The operational effects of the present embodiment are as follows.
(1) According to the inner liner joint detection device and detection method of the present embodiment, the position of the inner liner joint can be reliably detected.
(2) According to the raw tire manufacturing method of the present embodiment, the raw tires dispersed so that the positional relationship between the IL, BRK, SW, PLT, JLB, and TL has a predetermined positional relationship can be stably obtained. Can be manufactured.

DESCRIPTION OF SYMBOLS 1 Conveyance apparatus 2 Joint detection apparatus 3 Side wall sticking apparatus 4 Secondary molding apparatuses 11 and 12 Conveyor 13 Delivery part 14 Short roller conveyor 21 Drive roller 22 Free roller 23 Pressing roller 24 Distance sensor 25 Joint detector 26 Calculation parts 27 and 28 Fluid pressure cylinder 29 Control unit 31 Former 41 Belt drum 42 Belt transfer 43 Shaping drum 44 Stitcher device A Primary molded green tire B Inner liner B1 Joint B2 Raised portion C Carcass ply C1 Carcass ply joint D Side wall E Secondary molded green tire F Raw tire IL Inner liner PLT Carcass ply SW Side wall BRK Breaker JLB Jointless band TL Tread

Claims (3)

An inner liner joint detection method for detecting a position of an inner liner joint provided in a primary molded green tire,
A carry-in step of carrying in the primary molded green tire on which the inner liner is formed and placing it on a rotating means having a drive roller;
A detector insertion step of inserting a joint detector having two press rollers and a distance sensor into the inner surface side of the primary molded green tire and fixing the joint detector at a position facing the drive roller;
A rotating step of rotating the primary molded green tire by driving the drive roller in a state where the press roller and the drive roller are in contact with the primary molded green tire;
An inner liner comprising: a detecting step of detecting a position of the inner liner joint by measuring a distance between the distance sensor and the inner liner every predetermined time by the distance sensor. Joint detection method. An inner liner joint detection device for detecting the position of an inner liner joint provided in a primary molded green tire,
Carrying-in means for carrying in the primary molded green tire formed with the inner liner and placing it on a rotating means having a drive roller;
A detector insertion means for inserting a joint detector having two pressing rollers and a distance sensor into the inner surface side of the primary molded green tire and fixing the joint detector at a position facing the drive roller;
Rotating means for rotating the primary molded green tire by driving the drive roller in a state where the press roller and the drive roller are in contact with the primary molded green tire,
An inner liner joint comprising: a detecting means for detecting a position of the inner liner joint by measuring a distance between the distance sensor and the inner liner every predetermined time by the distance sensor. Detection device. The position of the inner liner joint detected by the inner liner joint detection method according to claim 1 is determined on a molding former of the secondary molding apparatus using the inner liner joint detection device according to claim 2. After fixing in position
A raw tire manufacturing method, characterized in that a raw tire is formed with a predetermined interval between a winding end position and a winding start position of a side wall joint, a breaker joint, a tread joint, and a jointless band.

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