JP2017165029A - Raw material jointing position detecting method of annular body, tire defect inspecting method and tire manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently detect the circumferential position of a jointing part in an annular body upon manufacturing the annular body by using a belt-like member with the jointing part of raw members.SOLUTION: Whenever an annular body is manufactured sequentially through drawing, by a specified length, a long belt-like member with a jointing part formed by jointing sheet-like raw members of a constant raw fabric length and winding the belt-like member annularly, sought is the circumferential predicted position of the jointing position on the circumference of the annular body. The circumferential position of the jointing part of the raw member is detected within the inspection range set with the circumferential predicted position as a reference. Upon seeking the circumferential predicted position, the circumferential predicted position of the jointing part is sought by using the jointing part length from the tip part to the jointing part of the jointing part of the raw member in the drawing region of the belt-like member drawn from the tip part of the belt-like member and the drawing length of the belt-like member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for detecting a joining position of original members in an annular body, a tire defect inspection method, and a tire manufacturing method.

In the tire inspection, a surface inspection for inspecting the presence / absence of defects on the outer surface (outer surface) and the inner surface (inner surface) of the tire and an internal inspection for inspecting defects inside the tire are performed.
Among the tire inspections, particularly in the internal inspection, defects are likely to occur in the vicinity of the joining portion of the original members formed due to the manufacture of the tire. It is preferable to perform a defect inspection. The tire is obtained by vulcanizing a raw tire (green tire), but the raw tire (green tire) is cut into a predetermined length from a long belt-like member and wound into an annular shape to form an annular body. Can be obtained. Since the long belt-like member is produced by joining the sheet-like raw members having a constant original fabric length, the belt-like member has the joining portions of the original members every constant raw fabric length interval. Exists. Therefore, the annular member formed by cutting the belt-like member to a predetermined length may or may not have the joining portion of the original member, and the joining portion of the original member may not exist. The position on the circumference of the annular body also varies from one annular body to another. Accordingly, even in a raw tire having a configuration in which a plurality of types of belt-shaped members are stacked in an annular shape, the presence or absence of the joining portion of the original member and the circumferential position of the joining portion of the raw tire vary from raw tire to tire.

For example, a technique is known in which the top and bottom of a green tire are determined by detecting the shape of a splice portion of an inner liner provided inside a green tire (green tire) before vulcanization (Patent Document 1). The splice part is a connecting part between the inner liner members that are formed by cutting the inner liner member, which is a long belt-like member, according to the circumference of the green tire and winding it in an annular shape. It is different from the connecting part.
Specifically, by inspecting the surface irregularities of the inner wall surface of the inner liner provided on the inner wall surface side of the raw tire using two light reflective sensors having a phase along the tire circumferential direction, the inner liner The shape of the splice portion (the connection portion between the belt-like members for winding the inner liner in an annular shape) is detected, and the top and bottom of the green tire are determined from this shape.

Japanese Patent Laid-Open No. 01-168405

  Although the above technique is not intended for tire inspection, the position of the splice portion of the inner liner can be specified. However, since the inner liner is formed by joining the original members of a certain original fabric length and cutting the elongated belt-like member along the circumference of the raw tire and winding the members in an annular shape, In addition to the splice part, the annular inner liner provided on the base member also has a joining part for the original members. However, in the above technique, the spliced portion is detected to determine whether the raw tire is up or down, but the spliced portion of the original members is not detected.

  Therefore, in the present invention, unlike the splice portion that is a connection portion between the strip-shaped members, when the annular body is produced using the strip-shaped member having the joining portion of the original members, the joining portion of the original members in the annular body is It is an object of the present invention to provide a method for efficiently detecting a circumferential position, a tire defect inspection method using the detection method, and a tire manufacturing method including the tire defect inspection method.

One embodiment of the present invention is a method for detecting a joining position of original members in an annular body. The detection method is as follows:
The belt-like member is pulled out from the end of the long belt-like member having a joining portion formed by joining the sheet-like raw material of a certain original fabric length including rubber and cut by a predetermined drawing length. Each time the annular body around which the belt-shaped member is wound in an annular shape is sequentially produced, obtaining the circumferential predicted position of the joining portion on the circumference of the annular body; and
Each time the predicted circumferential position is obtained, the connection of the original members on the circumference of the annular body is narrower than the entire circumference of the annular body including the predicted circumferential position with reference to the predicted circumferential position. Detecting the circumferential position of the mating portion using a measuring device,
In the step of obtaining the predicted circumferential position, a joining portion length of the joining portion of the original member in the withdrawal region of the strip-like member drawn out from the leading end portion of the strip-like member, from the leading end portion to the joining portion, The predicted circumferential position of the joining portion is obtained using the pull-out length of the band-shaped member.

  When the M-th (M is an integer of 2 or more) annular body is produced by pulling out the belt-like member, the detected circumferential position and the predicted circumferential position in the annular body produced before the M-th body It is preferable that the difference between the two is used together with the length of the joining portion and the pull-out length of the belt-like member to obtain the predicted circumferential position of the joining portion in the M-th annular body.

The annular body is produced by winding the belt-shaped member around the outer periphery of a cylindrical drum,
The front end of the belt-like member is displaced by an angle β degrees on the outer periphery with respect to the origin position on the outer periphery of the drum, the original fabric length is L, and the drawing length is R. Regarding the length of the difference between the detected circumferential position of the joint portion and the predicted circumferential position of the joint portion in the (n-1) -th (n is an integer of 2 or more) annular body ( The n-1) -th (n is an integer of 2 or more) annular body does not have the joining portion and does not have the difference length, and there is one joining portion and the difference length. The length of the difference is represented by γ _n-1 · R / 360 (γ _n-1 is an angle of 0 or more), and the (n-1) th (n is 2 or more). In the case where there are a plurality of joining portions and a plurality of the difference lengths, among the plurality of joining portions, Serial tip opposite lengths γ _{n-1 ·} R / 360 of the difference in the closest spliced portion to the rear end of the (γ _n-1, the angle of zero degrees and less than 360 degrees) was expressed in When
The length of the joining portion used when obtaining the predicted circumferential position of the M-th annular body is represented by an angle β + {L · i−R × (M−1)} · (360, where i is an integer of 1 or more. / R) + (γ ₁ + γ ₂ +... + Γ _M−2 + γ _M−1 ) using an integer i that is greater than 0 and less than 360 degrees, L · i−R × (M−1) It is preferably represented by + (γ ₁ + γ ₂ + γ ₃ +... + Γ _M−2 + γ _M−1 ) · R / 360.

In order to adjust the front end of the band-shaped member, a set adjustment length is cut from the front end by a set adjustment length to create a new front end of the band-shaped member,
When the M-th (M is an integer of 2 or more) annular body is drawn out from the new tip by the withdrawal length, the adjustment length is used to further adjust the M-th annular body. It is preferable to obtain the circumferential predicted position of the joining portion.

The annular body is produced by winding the belt-shaped member around the outer periphery of a cylindrical drum,
The front end of the belt-like member is displaced by an angle β degrees on the outer periphery with respect to the origin position on the outer periphery of the drum, the original fabric length is L, and the drawing length is R. Regarding the length of the difference between the detected circumferential position of the joint portion and the predicted circumferential position of the joint portion in the (n-1) -th (n is an integer of 2 or more) annular body ( The n-1) -th (n is an integer of 2 or more) annular body does not have the joining portion and does not have the difference length, and there is one joining portion and the difference length. The length of the difference is represented by γ _n−1 · R / 360 (γ _n−1 is an angle of 0 degree to less than 360 degree), and the (n−1) th ( If n is an integer of 2 or more) and there are a plurality of the connecting portions and a plurality of the difference lengths, a plurality of connecting portions Of cause part, the distal end portion opposite the rear end the difference of the length of the γ _{n-1 ·} R / 360 in the nearest joint fit portion (gamma _n-1 is 0 or more angles) expressed in , (N-1) when the adjustment length when producing the (n is an integer of 2 or more) annular body is represented by δ _n-1 (δ _n-1 is a length of 0 or more) ,
The length of the joining portion used when obtaining the predicted circumferential position of the M-th annular body is defined as an angle β + {L · i−R × (M−1) − (δ ₁ ) where i is an integer of 1 or more. + Δ ₂ +... + Δ _M−2 + δ _M−1 + δ _M )} · (360 / R) + (γ ₁ + γ ₂ +... + Γ _M−2 + γ _M−1 ) is greater than 0 and less than 360 degrees. L · i−R × (M−1) − (δ ₁ + δ ₂ +... + Δ _M−2 + δ _M−1 + δ _M ) + (γ ₁ + γ ₂ + γ ₃ +... + Γ _M−2 + γ _M−1 ) · R / 360.

The position on the outer periphery of the drum in the annular body of the tip is predetermined,
A label code display body representing identification information of the structure is pasted at a predetermined position on the outer periphery of the drum to the annular structure manufactured on the drum using the annular body. ,
The information on the position of the label code display body, the information on the position of the tip, and the information on the circumferential position of the detected connecting portion are associated with the identification information of the structure, And storing in the storage means.

Another aspect of the present invention is a tire defect inspection method. The defect inspection method is
The original member is pulled out from the end of a long band-shaped member having a joining portion formed by joining together a sheet-like original member of a certain original fabric length including rubber and cut by a predetermined drawing length. Each time the annular body around which the belt-shaped member is wound in an annular shape is sequentially produced, obtaining the circumferential predicted position of the joining portion on the circumference of the annular body; and
Each time the predicted circumferential position is obtained, the connection of the original members on the circumference of the annular body is narrower than the entire circumference of the annular body including the predicted circumferential position with reference to the predicted circumferential position. Detecting the circumferential position of the mating portion using a measuring device;
Using at least the circumferential position of the detected joint portion, and at least inspecting the presence or absence of a defect caused by the joint portion of a tire made of a raw tire including the annular body,
In the step of obtaining the predicted circumferential position, the length of the connecting portion of the original member in the pull-out region of the band-shaped member drawn out from the tip portion of the band-shaped member, the length of the connecting portion from the tip portion, Using the pull-out length, the predicted circumferential position of the joining portion is obtained.

  When the M-th (M is an integer of 2 or more) annular body is produced by pulling out the belt-like member, the detected circumferential position and the predicted circumferential position in the annular body produced before the M-th body It is preferable to obtain the predicted circumferential position in the M-th annular body using the difference between the two together with the joining portion length and the pull-out length of the belt-like member.

The annular body is produced by winding the belt-shaped member around the outer periphery of a cylindrical drum,
Tip of the belt-shaped member, based on the original position on the outer circumference of the drum, said has deviated angle β of positions on the outer periphery, the raw sheet length L, and the extraction length as R, (N-1) Regarding the length of the difference between the detected circumferential position of the splicing portion and the predicted circumferential position corresponding to the circumferential position in the n-th (n is an integer of 2 or more) annular body , (N−1) -th (n is an integer of 2 or more) annular body when the joining portion does not exist and there is no length of the difference, and there is one joining portion and the difference The length of the difference is represented by γ _n−1 · R / 360 (γ _n−1 is an angle of 0 or more), and the (n−1) th (n is 2). If there are a plurality of the joining portions in the annular body of the above integer) and there are a plurality of the lengths of the differences, a plurality of joining portions are used. , The tip portion opposite the length of the difference in the nearest joint fit portion at the rear end portion gamma _{n-1 ·} a R / 360 (γ _n-1, the angle of zero degrees and less than 360 degrees) Table with When
The length of the joining portion used when obtaining the predicted circumferential position of the M-th annular body is represented by an angle β + {L · i−R × (M−1)} · (360, where i is an integer of 1 or more. / R) + (γ ₁ + γ ₂ +... + Γ _M−2 + γ _M−1 ) using an integer i that is greater than 0 and less than 360 degrees, L · i−R × (M−1) It is preferably represented by + (γ ₁ + γ ₂ + γ ₃ +... + Γ _M−2 + γ _M−1 ) · R / 360.

In order to adjust the front end of the band-shaped member, a set adjustment length is cut from the front end by a set adjustment length to create a new front end of the band-shaped member,
When the M-th (M is an integer of 2 or more) annular body is drawn out from the new tip by the withdrawal length, the adjustment length is used to further adjust the M-th annular body. It is preferable to obtain the circumferential predicted position of the joining portion.

The annular body is produced by winding the belt-shaped member around the outer periphery of a cylindrical drum,
The front end of the belt-like member is displaced by an angle β degrees on the outer periphery with respect to the origin position on the outer periphery of the drum, the original fabric length is L, and the drawing length is R. (N-1) Regarding the length of the difference between the detected circumferential position of the splicing portion and the predicted circumferential position corresponding to the circumferential position in the n-th (n is an integer of 2 or more) annular body , (N−1) -th (n is an integer of 2 or more) annular body when the joining portion does not exist and there is no length of the difference, and there is one joining portion and the difference The length of the difference is represented by γ _n-1 · R / 360 (γ _n-1 is an angle of 0 degree or more and less than 360 degree), and the (n-1) th In the annular body (n is an integer of 2 or more), when there are a plurality of the joining portions and there are a plurality of the difference lengths, Of combined portion, the distal end portion opposite the rear end the difference of the length of the γ _{n-1 ·} R / 360 in the nearest joint fit portion (gamma _n-1 is 0 or more angles) expressed in , (N-1) when the adjustment length when producing the (n is an integer of 2 or more) annular body is represented by δ _n-1 (δ _n-1 is a length of 0 or more) ,
The joining position length used when obtaining the circumferential predicted position of the M-th annular body is defined as an angle β + {L · i−R × (M−1) − (δ) where i is an integer of 1 or more. ₁ + δ ₂ +... + Δ _M−2 + δ _M−1 + δ _M )} · (360 / R) + (γ ₁ + γ ₂ +... + Γ _M−2 + γ _M−1 ) is larger than 0 and 360 degrees. Using an integer i that is less than L · i−R × (M−1) − (δ ₁ + δ ₂ +... + Δ _M−2 + δ _M−1 + δ _M ) + (γ ₁ + γ ₂ + γ ₃ +... + Γ _M−2 + γ _M−1 ) · R / 360.

The position on the outer periphery of the drum in the annular body of the tip is predetermined,
A label code display body indicating identification information of the raw tire is attached to the annular raw tire produced on the drum using the annular body at a predetermined position on the outer periphery of the drum. And
The information on the position of the label code display body, the information on the circumferential position of the tip, and the information on the circumferential position of the detected connecting portion are associated with the identification information of the structure, and the structure Storing each body in the storage means;
In the step of inspecting for the presence or absence of the defect, identification information of the label code display body still attached to the tire made from the raw tire is detected and stored in the storage means using the identification information. Information on the position of the leading end portion and information on the circumferential position of the joining portion are obtained, and information on the circumferential position of the tip portion and information on the circumferential position of the joining portion are used. In addition, it is preferable to inspect for the presence or absence of a defect caused by the tip portion of the band-shaped member and a defect caused by the joining portion.

Yet another embodiment of the present invention is a tire manufacturing method. The manufacturing method is
Producing a long belt-like member having a joining portion formed by joining sheet-like original members of a certain original fabric length including rubber; and
A step of sequentially producing an annular body by drawing the original member from a front end portion of the belt-like member to a forming drum and cutting it to a predetermined drawing length; and
Each time the annular body is produced, the joining portion length of the joining portion of the original member in the withdrawal region of the strip-like member that is drawn out from the leading end portion of the strip-like member, and the joining portion length from the distal end portion to the joining portion, Using the withdrawing length of the band-shaped member, obtaining a circumferential predicted position of the joining portion on the circumference of the band-shaped member;
Each time when the predicted circumferential position of the splicing portion is obtained, the range on the circumference of the annular body is narrower than the entire circumference of the annular body including the predicted circumferential position on the basis of the predicted circumferential position. Detecting the circumferential position of the joint using a measuring device;
Producing the green tire using the annular body;
Vulcanizing the green tire to produce a tire;
Using the detected circumferential position of the joining portion, and at least inspecting the presence or absence of a defect caused by the joining portion of the belt-like member in a tire made of a raw tire including the annular body. .

  According to the method for detecting the position of the joining portion of the original member, the tire defect inspection method, and the tire manufacturing method, the circumferential position of the joining portion of the original member in the annular body can be efficiently detected. .

It is a figure explaining the detection system which enforces the detection method of the joining position of the original member of this embodiment. (A), (b) is a figure explaining the preparation example of a strip | belt-shaped member. (A)-(c) is a figure explaining an example of the process until detection of the circumferential position of a joining part performed in this embodiment. It is a figure explaining the example of prediction angle (alpha) 'degree which shows the joining part length obtained in this embodiment, and the circumference prediction position of a joining part. (A) is a figure explaining the example of affixing the label display body used by this embodiment, (b) is the information of the circumferential position information memorize | stored in association with the identification information displayed on a label display body. It is a figure which shows an example.

  Hereinafter, the detection method of the joining position of the original member in the annular body of the present invention, the tire defect inspection method, and the tire manufacturing method will be described in detail with reference to the drawings.

In the present embodiment, as a method for detecting a joining position of original members in an annular body, an annular body formed at the time of forming a raw tire (structure) will be described as an example. The annular body is obtained by cutting a long belt-like member such as an inner liner member, a carcass ply material, a belt member, or a belt cover member according to the circumference of the green tire and winding it in an annular shape. The long belt-like member is formed by joining a sheet-like original member having a certain original fabric length L including rubber, and has a joining portion between the original members. Since this elongated strip-shaped member is formed with a joining portion of the original members for each substantially constant original fabric length L, the length (drawing length) of the strip-shaped member is used for producing the annular body. From the information of (R) and the number of withdrawals or the number of annular bodies produced, the predicted circumferential position of the joining portion in the annular body can be obtained. The circumferential position of the joining portion on the circumference of the annular body is detected within a predetermined range with reference to the predicted circumferential position.
That is, in the present embodiment, the original member is fixed to the predetermined length from the distal end portion of the elongated belt-like member having the joining portion formed by joining the sheet-like original members having a certain original fabric length including rubber. A plurality of annular bodies each having a belt-like member wound in an annular shape are sequentially manufactured by pulling out the length R and cutting it. Every time the annular body is produced, the predicted circumferential position of the joining portion on the circumference of the annular body is obtained. At this time, the connecting portion length Lc, which is the distance from the leading end portion of the band-shaped member to the connecting portion, of the connecting portion of the original member in the pull-out region of the band-shaped member drawn from the leading end portion of the band-shaped member, and the band-shaped member Using the drawing length R, the circumferential predicted position of the joining portion in the annular body is obtained. In addition, every time the predicted circumferential position is obtained, the circumference of the joining portion of the original member on the circumference of the annular body is narrower than the entire circumference of the annular body including the predicted circumferential position with respect to the predicted circumferential position. The position is detected using a measuring device. At the circumferential position of the joint, the circumferential position of the joint is detected in a range narrower than the entire circumference of the annular body based on the predicted circumferential position of the joint. Without measuring (joining position) all around the annular body, the circumferential position of the joining part can be detected efficiently.
Details of this embodiment will be described below.

FIG. 1 is a diagram illustrating an example of a detection system 1 that implements a method for detecting a joining position of original members according to the present embodiment.
In the detection system 1, when the annular member 14 is produced by winding the belt-like member 10 around the outer periphery of the cylindrical molding drum 12, the joining portion C of the original member 11 (see FIGS. 2A and 2B). The circumferential position in the annular body is detected.
The detection system 1 includes a joining unit detection sensor 20, a label code reader 21, and a control / processing device 30.

  Around the forming drum 12, a member pulling mechanism 16 for pulling out the belt-like member 10 by a predetermined length is provided for forming a raw titer. The member pulling mechanism 16 includes, for example, a driving roller that conveys the belt-shaped member 10. The operation of the member pulling mechanism 16 is controlled according to an instruction from the control / processing device 30. The pulling length of the belt-like member 10 pulled out by the member pulling mechanism 16 is set by the control / processing device 30.

The joining portion detection sensor 20 is a sensor that detects the joining portion C of the original member 11 in the annular body 14 constituted by the belt-like member 10 wound around the forming drum 12. The joining portion detection sensor 20 is a sensor that measures surface irregularities on the circumference of the annular body 14 by using, for example, a laser displacement meter. The measurement data is configured to be sent to the control / processing device 30.
The label code reader 21 is a sensor that reads identification information displayed on a label code display body 50 to be described later attached to the raw tire.

  The molding drum 12 is provided with a drum driving unit 18 including a driving source such as an electric motor so as to rotate around the central axis Axis of the molding drum 12. The operation of the drum driving unit 18 is controlled so as to rotate the forming drum 12 in accordance with an instruction from the control / processing device 30.

  The control / processing device 30 is configured by a computer including a CPU 32 and a memory 34. A program is stored in the memory 34, and a setting unit 36, a predicted circumferential position calculation unit 38, a circumferential position detection unit 40, and a management unit 41 are formed by calling and starting the program. That is, the setting unit 36, the predicted circumferential position calculation unit 38, the circumferential position detection unit 40, and the management unit 41 are software modules formed by starting up a program. Therefore, the CPU 32 substantially controls these operations. A display 42 and a mouse / keyboard 44 are connected to the control / processing device 30.

  The setting part 30 is a label code display body 50 (FIG. 5 (FIG. 5) described later) that is affixed to the circumferential position on the molding drum 12 (the circumferential position of the splice part S) of the tip E of the band-shaped member 10 and the molded green tire. The mouse / keyboard 44 while the operator sees the input setting screen displayed on the display 42 with respect to the information on the circumferential position on the molding drum 12 and the pulling length R of the band-shaped member 10 by the member pulling mechanism 16 in FIG. Set according to the input made via. Each circumferential position is set by an angle in the azimuth direction (θ direction in the figure) with reference to the origin position θ = 0 on the circumference of the molding drum 12 set in advance. In the present embodiment, the circumferential position of the splice portion S is set at an angle β degrees counterclockwise with respect to the origin position θ = 0, and the circumferential position of the label code display body is relative to the origin position θ = 0. Thus, the angle φ is set counterclockwise (see FIG. 5A).

  The control / processing device 30 realizes the pull-out length R of the belt-shaped member 10 by controlling the operation of the member pull-out mechanism 16 based on the set pull-out length R. The drawing length R is set to be longer than the circumferential length of the molding drum 12 in order that the portion near the front end portion and the portion near the rear end portion of the belt-like member 10 overlap each other on the molding drum 12 by a certain length. It is preferable.

  Before the molding starts, the molding drum 12 is rotated in advance so that the position where the end E of the belt-like member 10 is arranged on the molding drum 12 is shifted from the origin position θ = 0 by an angle β degrees counterclockwise. To do. As a result, the circumferential position of the splice portion S of the annular body 14 becomes a position of an angle β. The circumferential position of the splice part S is, for example, the circumferential position of the tip E.

In the formation of the green tire, the annular member 14 in which the belt-like member 10 is annularly wound is sequentially produced by drawing the belt-like member 10 from the tip E of the belt-like member 10 and cutting it.
Every time the annular body 14 is produced, the predicted circumferential position calculation unit 38 obtains the predicted circumferential position PC (see FIG. 3C) of the joining portion C of the original member 11 on the circumference of the annular body 14. The estimated circumferential position PC is obtained using information set by the setting unit 36. A specific calculation method will be described later.

  In the circumferential position detection unit 40, every time the predicted circumferential position is obtained, the circumferential position of the annular body 14 is narrower than the entire circumference of the annular body 14 including the predicted circumferential position PC with reference to the predicted circumferential position PC. The circumferential position of the joining portion C of the original member 11 is detected. The detection of the circumferential position is performed using the measurement data of the surface unevenness of the annular body 14 sent from the joint detection sensor 20. For example, the circumferential position where the step in the surface height direction in the measurement data of the surface unevenness exceeds the first threshold value or the circumferential position where the gradient of the step exceeds the second threshold value is measured on the circumference of the joint C. The circumferential position detector 40 determines the position. In the present embodiment, the circumferential position of the joining portion C is represented by an angle α degree along the counterclockwise direction from the origin position θ = 0.

Further, a plurality of belt-like members 14 (for example, a carcass member, a belt member, and a belt cover material) are sequentially wound so as to be stacked on the produced annular body 14 (for example, the annular body of the inner liner member), thereby An annular body in which the belt-like members 14 are laminated, that is, a green tire is produced. On the raw tire produced on the forming drum 12, a label code display body 50 (see FIG. 5A), which represents identification information for each raw tire, is provided at a circumferential position on the raw tire set in advance. The forming drum 12 rotates so that it can be attached. In the present embodiment, the label code display body 50 is affixed at a position shifted by an angle φ degree along the counterclockwise direction from the origin position θ = 0.
In the present embodiment, the circumferential position of the splice portion S and the circumferential position of the label code display body are preset positions, but the circumferential position of the splice portion S and the circumferential position of the label code display body are preset. Without being set, the splice part S and the label code display body may be affixed at arbitrary circumferential positions. In this case, it is preferable that the circumferential positions of the splice portion S and the label code display body are detected using a sensor. The circumferential position detected by the sensor is represented by an angle β degree and an angle φ degree.

  The circumferential position detection unit 40 includes information on the circumferential position detected by the joining unit C (angle α degrees), information on the circumferential position of the splice section S (angle β degrees), and the circumferential position of the label code table 50 itself. This information (angle φ degree) is stored in the memory 34 for each raw tire in association with the identification information of the raw tire displayed on the label code table 50 itself.

  The management unit 41 is configured to control and manage the operations of the setting unit 36, the circumferential position detection unit 40, and the circumferential position detection unit 40, and to extract identification information from the reading result sent from the label code reader 21. Has been.

  A method for detecting the position of the joining portion C, a defect inspection method, and a tire manufacturing method performed by the detection system 1 will be described in detail.

  FIGS. 2A and 2B are views for explaining a production example of the belt-like member 10. The belt-like member 10 shown in FIG. 2 (a) is cut along the width direction perpendicular to the length direction of the original member 11 for each fixed length while feeding the sheet-like original member 11 in one direction. Furthermore, the cut original members 11 are connected to each other so that the cut portions 11a become side portions of the band-shaped member 10. Accordingly, the side portion 11 b of the original member 11 corresponds to the joining portion C of the original member 11 in the band-shaped member 10. Therefore, the belt-like member 10 is formed with a joining portion C for each constant original fabric length L corresponding to the width of the original member 11. For example, an inner liner member, a carcass ply member, a belt cover member, or the like corresponds to the belt-like member 10 having the form shown in FIG.

  On the other hand, the belt-like member 10 shown in FIG. 2B is inclined with respect to the width direction orthogonal to the length direction of the original member 11 for each fixed length while feeding the sheet-like original member 11 in one direction. It is produced by joining the cut original members 11 so that the cut portions 11a are side portions of the band-shaped member 10 along the cut direction. Accordingly, the side portion 11 b of the original member 11 corresponds to the joining portion C of the original member 11 in the band-shaped member 10. Therefore, the band-shaped member 10 is formed with a joining portion C for every fixed original fabric length L corresponding to the cut length of the original member 11. Therefore, the joining portion C extends in the band-shaped member 10 in a direction inclined with respect to the width direction of the band-shaped member 10. In this case, the circumferential position of the joining portion C in the present embodiment is used, for example, as a representative of the circumferential position at the center position in the width direction of the band-shaped member 10. For example, the belt member corresponds to the belt-like member 10 having the form shown in FIG.

FIGS. 3A to 3C are diagrams illustrating an example of processing until the circumferential position C of the joining unit C is detected.
First, the circumferential position on the forming drum 12 (the circumferential position of the splice portion S) of the leading end E of the belt-like member 10 set by the setting portion 36 is shifted counterclockwise by an angle β degrees from the origin position θ = 0. The position is adjusted by rotating the molding drum 12 so that the position is reached. This state is shown in FIG. The leading end E of the belt-like member 10 is pressed and fixed to the forming drum 12 by a not-shown get roll or the like, and when the forming drum 12 rotates in this state, the belt-like member 10 is wound around the circumference of the forming drum 12. It is. The belt-like member 10 that has been wound once is cut by a cutter (not shown). The length of the cut strip-shaped member 10 is a drawing length R set in advance by the adjusting unit 20.
At this time, the predicted circumferential position calculation unit 28 joins from the leading end E of the joining portion C of the original member 11 within the pulling-out length R of the strip-like member drawn out from the leading end E of the strip-like member 10. Using the joining portion length Lc (see FIG. 1) to the joining portion C and the pull-out length R of the belt-like member 10, the estimated circumferential position of the joining portion C is obtained. For example, in the case where the annular body 14 is sequentially manufactured with the raw fabric length L of 2000 mm and the drawer length R of 1750 mm, the joining portion C does not exist in the first annular body 14, but the second one A joining portion C exists at a position 250 mm (= 2000 mm-1750 mm) from the front end E of the belt-like member 10 used for the annular body 14. Therefore, the joining portion length Lc at this time is 250 mm. The band-shaped member 10 used for the third annular member 14 has a joining portion C at a position 500 mm (= 2000 mm × 2-1750 mm × 2) from the tip E of the band-shaped member 10. The distance from the tip E of the joining portion C is the joining portion length Lc.

As described above, since the joining portion C exists at a position separated from the distal end portion E of the strip-like member 10 by the joining portion length Lc, the annular body 14 produced using the strip-like member 10 includes the distal end portion E. It is predicted that the connecting portion C exists in a position that is connected in the counterclockwise direction to the connecting portion length Lc and along the circumference. However, since the belt-like member 10 is wound in an annular shape while being pulled on the molded body 12, the belt-like member 10 containing rubber is stretched and stretched counterclockwise from the tip portion E by the length Lc on the circumference. The connecting portion C does not necessarily exist at a position separated along. In other words, the actual joining portion C may deviate from the estimated circumferential position PC obtained using the joining portion length Lc and the drawing length R.
For this reason, in the present embodiment, the joining portion C is set in the inspection range Re (see FIG. 3C) that is narrower than the entire circumference of the annular body 14 including the predicted circumferential position PC with reference to the predicted circumferential position PC. Measurement is performed by the joining portion detection sensor 20, and the circumferential position of the joining portion C is detected by the circumferential position detection unit 40.

  When the annular body 14 is manufactured, the circumferential position of the joining portion C is shifted from the predicted circumferential position PC due to expansion and contraction as described above. Since the deviation is accumulated, there is a high possibility that the actual circumferential position of the joining portion C is deviated from the inspection range Re of the joining portion C with respect to the predicted traveling position PC. For this reason, it is preferable to accumulate the above-described deviation when the annular body 14 was previously produced and adjust the joining portion length Lc from the tip E to the joining portion C. Specifically, when the M-th (M is an integer greater than or equal to 2) annular body 14 is produced by pulling out the belt-like member 10 from the tip E, detection is performed on the annular body 14 produced before the M-th member. The difference between the circumferential position and the predicted circumferential position PC is used together with the joining portion length Lc and the pull-out length R of the belt-like member 10, and the circumference of the joining portion C in the M-th annular body 14 is used. It is preferable to obtain the predicted position PC.

Specifically, the joint length Lc used when obtaining the circumferential predicted position of the M-th (M is an integer of 2 or more) annular body 14 is an angle β + {L · i−R × (M−1)} · (360 / R) + (γ ₁ + γ ₂ +... + γ _M−2 + γ _M−1 ) is an integer i that is greater than 0 and less than 360 degrees. L · i−R × (M−1) + (γ ₁ + γ ₂ + γ ₃ +... + Γ _M−2 + γ _M−1 ) · R / 360 is preferable. Here, γ _n-1 (n is an integer of 2 or more) is an angle of 0 degree or more and less than 360 degrees, and γ _n-1 · R / 360 is the (n-1) th (n is 2). This relates to the length of the difference between the circumferential position detected by the joining portion C in the annular body 14 and the predicted circumferential position PC of the joining portion C. More specifically, γ _n−1 · R / 360 is the length of the difference because the (n−1) -th (n is an integer of 2 or more) annular body 14 does not have a joining portion C. And the difference length when there is one connecting portion C and the difference length is one. When there is no joining part C and there is no length of the difference, γ _n-1 = 0. In addition, γ _n−1 · R / 360 is the (n−1) -th (n is an integer of 2 or more) annular body 14 having a plurality of connecting portions C and having a plurality of differences. In this case, it is the length of the difference in the joining portion C that is the closest to the rear end portion on the side opposite to the front end portion E among the plurality of joining portions C.

  FIG. 4 is a diagram for explaining an example of the predicted angle α ′ degrees indicating the joining portion length Lc and the predicted circumferential position PC of the joining portion C obtained in the present embodiment. In the table shown in FIG. 4, an example in which one annular body 14 is manufactured by winding the strip-shaped member 14 around the forming drum 12 with the drawing length R = 1750 mm, the original fabric length L = 2000 mm, and the like. At this time, in the table shown in FIG. 4, the joint portion length Lc that changes in accordance with the number of drum windings, and the predicted angle α ′ degree indicating the predicted coasting position PC of the joint portion C corresponding to the predicted coasting position PC. (An angle in a counterclockwise direction from the origin position θ = 0) is shown.

In the first drum winding (when the first annular body 14 is manufactured), the joining portion length Lc = 2000 mm and the drawing length R = 1750 mm. , It is predicted that the joining portion C does not exist. At this time, γ ₁ = 0. In the second drum winding (when the second annular body 14 is manufactured), the joining portion length Lc is 250 mm (= 2000 mm-1750 mm), and the predicted angle α ′ degree = β + Lc (= 250) / R ( = 1750) × 360. Difference angle at this time is expressed as gamma _2. Further, at the number of drum windings (M−1) times (M is an integer of 2 or more) (when the (M−1) th annular body 14 is manufactured), the angle β + {L · i−R × (M −1)} · (360 / R) + (γ ₁ + γ ₂ +... + Γ _M−2 + γ _M−1 ) using an integer i that is greater than 0 and less than 360 degrees, L · i− R × (M−1) + (γ ₁ + γ ₂ + γ ₃ +... + Γ _M−2 + γ _M−1 ) · (R / 360) Therefore, the circumferential predicted position PC (predicted angle α ′) is an angle β + {L · i−R × (M−1)} · (360 / R) + (γ ₁ + γ ₂ +... + Γ _M−2 + Γ _M-1 ).

In order to adjust the leading end E of the belt-like member 10, the belt-like member 10 may be cut at a position away from the leading end E by the set adjustment length to create a new leading edge E of the belt-like member. .
For example, when the leading end E is crushed and deviated from a predetermined dimension, or when the joining portion C exists in the vicinity of the leading end E or the rear end, in order to adjust the leading end E of the band-shaped member 10, In some cases, the region including the tip E of the band-shaped member 10 is cut and removed. For example, before the belt-shaped member 10 is pulled out from the distal end portion E to produce an M-th (M is an integer of 2 or more) annular body, a first range predetermined with respect to the distal end portion E of the belt-shaped member 10. Or within a second range set in advance with respect to the rear end portion of the belt-like member 10 obtained by drawing the belt-like member 10 from the tip E to cut the M-th annular body 14. It is determined whether or not there is a joining portion C. As a result of this determination, when the joining portion C is within the first range or within the second range, the band-shaped member 10 is so arranged that the joining portion C is out of the first range and the second range. In order to adjust the tip E, the region including the tip E is cut and removed.

In such a case, when the M-th (M is an integer of 2 or more) annular body 14 is drawn from the new tip E by the pull-out length R, the above-described adjustment length is used, and M It is preferable to obtain the circumferential predicted position PC of the joining portion C in the individual annular body 14.
At this time, the adjustment length when producing the (n-1) -th (n is an integer of 2 or more) annular body is represented by δ _n-1 (δ _n-1 is a length of 0 or more). In this case, the joining position length Lc used when obtaining the circumferential predicted position PC of the M-th annular body 14 is set to an angle β + {L · i −R × (M−1) − (δ ₁ + δ ₂ +... + Δ _M−2 + δ _M−1 + δ _M )} · (360 / R) + (γ ₁ + γ ₂ +... + Γ _M−2 Using an integer i such that + γ _M−1 ) is greater than 0 and less than 360 degrees, L · i−R × (M−1) − (δ ₁ + δ ₂ +... + Δ _M−2 + δ _{M− 1} + δ _M ) + (γ ₁ + γ ₂ + γ ₃ +... + Γ _M−2 + γ _M−1 ) · R / 360 As described above, when the M-th annular body 14 is produced, the joining position length Lc is obtained in consideration of the adjustment lengths of the M-th and the annular bodies 14 before the M-th, thereby obtaining more accuracy. It is possible to obtain the circumferential predicted position PC (predicted angle α ′) of the joint portion C having a high height. The high-precise circumferential predicted position PC means that the circumferential position of the joining portion C can be reliably detected in the inspection range defined with the predicted circumferential position PC as a reference.

  FIG. 3C is a diagram for explaining the measurement of the joining portion C using the joining portion detection sensor 20. In the measurement of the joining portion C, as shown in FIG. 3C, the annular body 14 is measured in a predetermined inspection range Re including the predicted circumferential position PC with reference to the predicted circumferential position PC of the joining portion C. By measuring the surface irregularities on the circumference, the position on the circumference of the joining portion C can be detected. In this case, the length along the circumference of the inspection range Re is preferably 1/20 to 1/10 of the circumference of the annular body 14 with the circumferential predicted position PC as the center.

  Information on the circumferential position of the joining portion C detected in this way, specifically, information on the angle α degree along the counterclockwise direction from the origin position θ = 0 on the forming drum 12, and the splice Information on the angle β degrees along the counterclockwise direction from the origin position θ = 0, which represents the circumferential position of the part S, is stored in the memory 34.

  Each time a different kind of band-like member 10 is laminated and wound around the produced annular body 14 and another kind of belt-like member 10 is wound around to produce the annular body 14, Obtaining the predicted circumferential position PC and detecting the circumferential position of the joining portion C, the information on the circumferential position of the joining portion C and the information on the circumferential position of the splice portion S are stored in the memory 34. Is done.

As shown in FIG. 5 (a), a label code display body 50 is attached to the green tire formed by laminating a plurality of belt-like members 10 on the annular body 14 and winding them in an annular shape. FIG. 5A is a diagram for explaining an example of affixing of the label display body 50, and FIG. 5B shows the circumferential position stored in association with the identification information displayed on the label display body 50. FIG. It is a figure which shows an example of information. As shown to Fig.5 (a), the shaping | molding drum 12 rotates so that it may affix on the predetermined circumferential position in a raw tire. In the example shown in FIG. 5A, the label code display body 50 is affixed at a position shifted by an angle φ degrees along the counterclockwise direction from the origin position θ = 0. The angle φ degree is set by the setting unit 30, and the molding is performed so that the attaching position of the label code display body 50 determined by the work flow at the time of molding is the position of the angle φ degree. The green tire on the drum 12 is rotated. Information on the circumferential position where the label code display 50 is attached is stored in the memory 34.
Information on each circumferential position associated with the identification information stored in the memory 34 is sent to a defect inspection apparatus that performs defect inspection in an inspection process for inspecting a tire.

  The label code of the label code display 50 attached to the raw tire is read by the label code reader 21, and the identification information shown on the label code display 50 is extracted by the management unit 41 from the read result. This identification information is sent to the memory 34, and as shown in FIG. 5B, the information on the circumferential position of the joining portion C, the information on the circumferential position of the splice portion S, and the label code display 50 are pasted. The information on the circumferential position to be attached and the extracted identification information are stored in association with each other. In FIG. 5 (b), information on each circumferential position of one type of band-shaped member (for example, inner liner member) is stored in association with identification information, but another type of band-shaped member (for example, Information on each circumferential position of the carcass ply material, belt member, or belt cover member is also stored in association with the identification information.

  The molded raw tire is vulcanized after the tread rubber is wound around. By vulcanization, the green tire becomes a vulcanized tire, that is, a tire. Thereafter, the tire is inspected for defects. At this time, since the label code display 50 is still attached to the tire, in the inspection process, the label code of the label code display 50 is read by the label code reader, and the identification information extracted from the read label code is used. The information on each circumferential position is acquired from the information on each circumferential position associated with the identification information sent from the control / processing device 30 to the defect inspection apparatus. In the present embodiment, at least information on the circumferential position of the joining portion C is used to inspect at least whether there is a defect caused by the joining portion C of a tire made from a raw tire. In the present embodiment, a region around the circumferential position of the splice portion S (tip portion E) using information on the circumferential position of the splice portion S (tip portion E) and information on the circumferential position of the joining portion C. Then, the area around the circumferential position of the joining portion C is defined, and the presence or absence of a defect caused by the leading end E of the band-like member 10 and a defect caused by the joining portion C is inspected in detail for these regions. preferable. More specifically, since the circumferential position of the splice portion S (tip portion E) and the circumferential position of the joining portion C can be identified with reference to the circumferential position of the label code display body 50, this is specified. An area including the circumferential position can be determined.

  Thus, in this embodiment, since the circumferential position of the joining portion C is detected in the inspection range Re that is narrower than the entire circumference of the annular body based on the predicted circumferential position PC of the joining portion C, the joining portion C is detected. Without measuring the position of the part C over the entire circumference of the annular body 14, the position of the joining part C can be detected efficiently.

  The tire defect inspection method of this embodiment can be introduced into a tire manufacturing process. Specifically, when forming the raw tire, the circumferential position of the joining portion C of the present embodiment is detected, and the vulcanized tire is caused by the defect caused by the joining portion C and the splice portion S. By inspecting for the presence or absence of defects, tires that cannot accept the defects can be screened as defective.

  As mentioned above, although the detection method of the joining position of the original member of the present invention, the tire defect inspection method, and the tire manufacturing method have been described in detail, the present invention is not limited to the above-described embodiment, and departs from the gist of the present invention. Of course, various improvements and changes may be made within the range not to be performed.

DESCRIPTION OF SYMBOLS 1 Detection system 10 Strip | belt-shaped member 11 Original member 11a Cutting | disconnection part 11b Side part 12 Molding drum 14 Annular body 16 Member pulling mechanism 18 Drum drive part 20 Joining part detection sensor 21 Label code reader 30 Control / processing apparatus 32 CPU
34 Memory 36 Setting Unit 38 Circumferential Predicted Position Calculation Unit 40 Circumferential Position Detection Unit 41 Management Unit 42 Display 44 Mouse / Keyboard

Claims (13)

A method for detecting a joining position of original members in an annular body,
The belt-like member is pulled out from the end of the long belt-like member having a joining portion formed by joining the sheet-like raw material of a certain original fabric length including rubber and cut by a predetermined drawing length. Each time the annular body around which the belt-shaped member is wound in an annular shape is sequentially produced, obtaining the circumferential predicted position of the joining portion on the circumference of the annular body; and
Each time the predicted circumferential position is obtained, the connection of the original members on the circumference of the annular body is narrower than the entire circumference of the annular body including the predicted circumferential position with reference to the predicted circumferential position. Detecting the circumferential position of the mating portion using a measuring device,
In the step of obtaining the predicted circumferential position, a joining portion length of the joining portion of the original member in the withdrawal region of the strip-like member drawn out from the leading end portion of the strip-like member, from the leading end portion to the joining portion, A method for detecting the circumferentially predicted position of the joining portion by using the pull-out length of the band-shaped member.   When the M-th (M is an integer of 2 or more) annular body is produced by pulling out the belt-like member, the detected circumferential position and the predicted circumferential position in the annular body produced before the M-th body The difference between the two is used together with the joining portion length and the pull-out length of the belt-like member to determine the predicted circumferential position of the joining portion in the M-th annular body. Detection method. The annular body is produced by winding the belt-shaped member around the outer periphery of a cylindrical drum,
The front end of the belt-like member is displaced by an angle β degrees on the outer periphery with respect to the origin position on the outer periphery of the drum, the original fabric length is L, and the drawing length is R. Regarding the length of the difference between the detected circumferential position of the joint portion and the predicted circumferential position of the joint portion in the (n-1) -th (n is an integer of 2 or more) annular body ( The n-1) -th (n is an integer of 2 or more) annular body does not have the joining portion and does not have the difference length, and there is one joining portion and the difference length. The length of the difference is represented by γ _n-1 · R / 360 (γ _n-1 is an angle of 0 or more), and the (n-1) th (n is 2 or more). In the case where there are a plurality of joining portions and a plurality of the difference lengths, among the plurality of joining portions, Serial tip opposite lengths γ _{n-1 ·} R / 360 of the difference in the closest spliced portion to the rear end of the (γ _n-1, the angle of zero degrees and less than 360 degrees) was expressed in When
The length of the joining portion used when obtaining the predicted circumferential position of the M-th annular body is represented by an angle β + {L · i−R × (M−1)} · (360, where i is an integer of 1 or more. / R) + (γ ₁ + γ ₂ +... + Γ _M−2 + γ _M−1 ) using an integer i that is greater than 0 and less than 360 degrees, L · i−R × (M−1) The detection method according to claim 1 or 2, represented by + (γ ₁ + γ ₂ + γ ₃ +... + Γ _M−2 + γ _M−1 ) · R / 360. In order to adjust the front end of the band-shaped member, a set adjustment length is cut from the front end by a set adjustment length to create a new front end of the band-shaped member,
When the M-th (M is an integer of 2 or more) annular body is drawn out from the new tip by the withdrawal length, the adjustment length is used to further adjust the M-th annular body. The detection method of Claim 2 which calculates | requires the said circumference prediction position of the said connection part. The annular body is produced by winding the belt-shaped member around the outer periphery of a cylindrical drum,
The front end of the belt-like member is displaced by an angle β degrees on the outer periphery with respect to the origin position on the outer periphery of the drum, the original fabric length is L, and the drawing length is R. Regarding the length of the difference between the detected circumferential position of the joint portion and the predicted circumferential position of the joint portion in the (n-1) -th (n is an integer of 2 or more) annular body ( The n-1) -th (n is an integer of 2 or more) annular body does not have the joining portion and does not have the difference length, and there is one joining portion and the difference length. The length of the difference is represented by γ _n−1 · R / 360 (γ _n−1 is an angle of 0 degree to less than 360 degree), and the (n−1) th ( If n is an integer of 2 or more) and there are a plurality of the connecting portions and a plurality of the difference lengths, a plurality of connecting portions Of cause part, the distal end portion opposite the rear end the difference of the length of the γ _{n-1 ·} R / 360 in the nearest joint fit portion (gamma _n-1 is 0 or more angles) expressed in , (N-1) when the adjustment length when producing the (n is an integer of 2 or more) annular body is represented by δ _n-1 (δ _n-1 is a length of 0 or more) ,
The length of the joining portion used when obtaining the predicted circumferential position of the M-th annular body is defined as an angle β + {L · i−R × (M−1) − (δ ₁ ) where i is an integer of 1 or more. + Δ ₂ +... + Δ _M−2 + δ _M−1 + δ _M )} · (360 / R) + (γ ₁ + γ ₂ +... + Γ _M−2 + γ _M−1 ) is greater than 0 and less than 360 degrees. L · i−R × (M−1) − (δ ₁ + δ ₂ +... + Δ _M−2 + δ _M−1 + δ _M ) + (γ ₁ + γ ₂ + γ ₃ The detection method according to claim 4, represented by +... + Γ _M−2 + γ _M−1 ) · R / 360. The position on the outer periphery of the drum in the annular body of the tip is predetermined,
A label code display body representing identification information of the structure is pasted at a predetermined position on the outer periphery of the drum to the annular structure manufactured on the drum using the annular body. ,
The information on the position of the label code display body, the information on the position of the tip, and the information on the circumferential position of the detected connecting portion are associated with the identification information of the structure, 6. The method according to claim 3 or 5, further comprising the step of storing in a storage means. A tire defect inspection method,
The original member is pulled out from the end of a long band-shaped member having a joining portion formed by joining together a sheet-like original member of a certain original fabric length including rubber and cut by a predetermined drawing length. Each time the annular body around which the belt-shaped member is wound in an annular shape is sequentially produced, obtaining the circumferential predicted position of the joining portion on the circumference of the annular body; and
Each time the predicted circumferential position is obtained, the connection of the original members on the circumference of the annular body is narrower than the entire circumference of the annular body including the predicted circumferential position with reference to the predicted circumferential position. Detecting the circumferential position of the mating portion using a measuring device;
Using at least the circumferential position of the detected joint portion, and at least inspecting the presence or absence of a defect caused by the joint portion of a tire made of a raw tire including the annular body,
In the step of obtaining the predicted circumferential position, the length of the connecting portion of the original member in the pull-out region of the band-shaped member drawn out from the tip portion of the band-shaped member, the length of the connecting portion from the tip portion, A defect inspection method, wherein the predicted on-circumference position of the joining portion is obtained using the pull-out length.   When the M-th (M is an integer of 2 or more) annular body is produced by pulling out the belt-like member, the detected circumferential position and the predicted circumferential position in the annular body produced before the M-th body The defect inspection method according to claim 7, wherein the estimated circumferential position in the M-th annular body is obtained using the difference between the two together with the joining portion length and the pull-out length of the band-shaped member. The annular body is produced by winding the belt-shaped member around the outer periphery of a cylindrical drum,
Tip of the belt-shaped member, based on the original position on the outer circumference of the drum, said has deviated angle β of positions on the outer periphery, the raw sheet length L, and the extraction length as R, (N-1) Regarding the length of the difference between the detected circumferential position of the splicing portion and the predicted circumferential position corresponding to the circumferential position in the n-th (n is an integer of 2 or more) annular body , (N−1) -th (n is an integer of 2 or more) annular body when the joining portion does not exist and there is no length of the difference, and there is one joining portion and the difference The length of the difference is represented by γ _n−1 · R / 360 (γ _n−1 is an angle of 0 or more), and the (n−1) th (n is 2). If there are a plurality of the joining portions in the annular body of the above integer) and there are a plurality of the lengths of the differences, a plurality of joining portions are used. , The tip portion opposite the length of the difference in the nearest joint fit portion at the rear end portion gamma _{n-1 ·} a R / 360 (γ _n-1, the angle of zero degrees and less than 360 degrees) Table with When
The length of the joining portion used when obtaining the predicted circumferential position of the M-th annular body is represented by an angle β + {L · i−R × (M−1)} · (360, where i is an integer of 1 or more. / R) + (γ ₁ + γ ₂ +... + Γ _M−2 + γ _M−1 ) using an integer i that is greater than 0 and less than 360 degrees, L · i−R × (M−1) The defect inspection method according to claim 7, represented by + (γ ₁ + γ ₂ + γ ₃ +... + Γ _M−2 + γ _M−1 ) · R / 360. In order to adjust the front end of the band-shaped member, a set adjustment length is cut from the front end by a set adjustment length to create a new front end of the band-shaped member,
When the M-th (M is an integer of 2 or more) annular body is drawn out from the new tip by the withdrawal length, the adjustment length is used to further adjust the M-th annular body. The defect inspection method of Claim 8 which calculates | requires the said circumference estimated position of the said connection part. The annular body is produced by winding the belt-shaped member around the outer periphery of a cylindrical drum,
The front end of the belt-like member is displaced by an angle β degrees on the outer periphery with respect to the origin position on the outer periphery of the drum, the original fabric length is L, and the drawing length is R. (N-1) Regarding the length of the difference between the detected circumferential position of the splicing portion and the predicted circumferential position corresponding to the circumferential position in the n-th (n is an integer of 2 or more) annular body , (N−1) -th (n is an integer of 2 or more) annular body when the joining portion does not exist and there is no length of the difference, and there is one joining portion and the difference The length of the difference is represented by γ _n-1 · R / 360 (γ _n-1 is an angle of 0 degree or more and less than 360 degree), and the (n-1) th In the annular body (n is an integer of 2 or more), when there are a plurality of the joining portions and there are a plurality of the difference lengths, Of combined portion, the distal end portion opposite the rear end the difference of the length of the γ _{n-1 ·} R / 360 in the nearest joint fit portion (gamma _n-1 is 0 or more angles) expressed in , (N-1) when the adjustment length when producing the (n is an integer of 2 or more) annular body is represented by δ _n-1 (δ _n-1 is a length of 0 or more) ,
The joining position length used when obtaining the circumferential predicted position of the M-th annular body is defined as an angle β + {L · i−R × (M−1) − (δ) where i is an integer of 1 or more. ₁ + δ ₂ +... + Δ _M−2 + δ _M−1 + δ _M )} · (360 / R) + (γ ₁ + γ ₂ +... + Γ _M−2 + γ _M−1 ) is larger than 0 and 360 degrees. Using an integer i that is less than L · i−R × (M−1) − (δ ₁ + δ ₂ +... + Δ _M−2 + δ _M−1 + δ _M ) + (γ ₁ + γ ₂ + γ The defect inspection method according to claim 10, represented by: ₃ +... + Γ _M−2 + γ _M−1 ) · R / 360. The position on the outer periphery of the drum in the annular body of the tip is predetermined,
A label code display body indicating identification information of the raw tire is attached to the annular raw tire produced on the drum using the annular body at a predetermined position on the outer periphery of the drum. And
The information on the position of the label code display body, the information on the circumferential position of the tip, and the information on the circumferential position of the detected connecting portion are associated with the identification information of the structure, and the structure Storing each body in the storage means;
In the step of inspecting for the presence or absence of the defect, identification information of the label code display body still attached to the tire made from the raw tire is detected and stored in the storage means using the identification information. Information on the position of the leading end portion and information on the circumferential position of the joining portion are obtained, and information on the circumferential position of the tip portion and information on the circumferential position of the joining portion are used. The defect inspection method according to claim 9 or 11, wherein the presence or absence of a defect caused by a tip portion of the belt-like member and a defect caused by the joining portion is inspected. A tire manufacturing method comprising:
Producing a long belt-like member having a joining portion formed by joining sheet-like original members of a certain original fabric length including rubber; and
A step of sequentially producing an annular body by drawing the original member from a front end portion of the belt-like member to a forming drum and cutting it to a predetermined drawing length; and
Each time the annular body is produced, the joining portion length of the joining portion of the original member in the withdrawal region of the strip-like member that is drawn out from the leading end portion of the strip-like member, and the joining portion length from the distal end portion to the joining portion, Using the withdrawing length of the band-shaped member, obtaining a circumferential predicted position of the joining portion on the circumference of the band-shaped member;
Each time when the predicted circumferential position of the splicing portion is obtained, the range on the circumference of the annular body is narrower than the entire circumference of the annular body including the predicted circumferential position on the basis of the predicted circumferential position. Detecting the circumferential position of the joint using a measuring device;
Producing the green tire using the annular body;
Vulcanizing the green tire to produce a tire;
Using the detected circumferential position of the joining portion, and at least inspecting the presence or absence of a defect caused by the joining portion of the belt-like member in a tire made of a raw tire including the annular body. A method for manufacturing a tire, characterized in that

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