JPH06323817A - Measuring method for tire tread length - Google Patents
Measuring method for tire tread lengthInfo
- Publication number
- JPH06323817A JPH06323817A JP11287193A JP11287193A JPH06323817A JP H06323817 A JPH06323817 A JP H06323817A JP 11287193 A JP11287193 A JP 11287193A JP 11287193 A JP11287193 A JP 11287193A JP H06323817 A JPH06323817 A JP H06323817A
- Authority
- JP
- Japan
- Prior art keywords
- tread
- shutter camera
- length
- leading edge
- slit light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は自動車等のタイヤのトレ
ッド長さを測定する方法に関し、更に詳しくは、スリッ
ト光を用いてトレッドの長さを高精度に測定することが
可能なタイヤトレッド長さ測定方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a tread length of a tire of an automobile or the like, and more specifically, a tire tread length capable of measuring the tread length with slit light with high accuracy. Regarding measurement method.
【０００２】[0002]
【従来の技術】近年、自動車における乗り心地性の向上
がより一層求められるようになってきている。この乗り
心地性は主にタイヤのユニフォミティに起因し、トレッ
ド長さの不均一がこのユニフォミティに少なからぬ悪影
響を及ぼすため、トレッド長さの精度管理が強く求めら
れている。2. Description of the Related Art In recent years, there has been an increasing demand for improved riding comfort in automobiles. This riding comfort is mainly due to the uniformity of the tires, and the unevenness of the tread length has a considerable adverse effect on the uniformity. Therefore, there is a strong demand for accuracy control of the tread length.
【０００３】ところで、従来、例えば、特開昭５９ー７
５１０６号公報に開示されているように、ラインセンサ
カメラと投光器を用い、トレッドのエッジ部の傾斜部に
光を当てて平面部との明暗の差から演算器を介してトレ
ッドの長さを測定するようにしている。しかし、測定部
のトレッドエッジ傾斜部にたるみが発生した場合、傾斜
部に十分な光を受けることが出来ないため、明暗の差が
現れず長さ検出が不能になる場合があると言う問題があ
った。また、長さ検出の精度向上のため、Ｓ／Ｎ比を上
げるには強い光源が必要となり、その結果光が平面部に
漏れて正確なエッジ検出が出来なくなると言う問題があ
った。By the way, conventionally, for example, Japanese Patent Laid-Open No. 59-7.
As disclosed in Japanese Patent No. 5106, a line sensor camera and a light projector are used, and light is applied to an inclined portion of an edge portion of the tread, and the length of the tread is measured from a difference in brightness from a flat portion through a calculator. I am trying to do it. However, if slack occurs in the tread edge slope of the measurement unit, sufficient light cannot be received by the slope, so there is a problem that the difference in brightness does not appear and the length detection may become impossible. there were. Further, in order to improve the accuracy of length detection, a strong light source is required to increase the S / N ratio, and as a result, light leaks to the flat surface portion and accurate edge detection cannot be performed.
【０００４】また、特開昭６１ー１４５０７号公報に、
搬送されてきたトレッドの底面前端を光反射型センサに
より検出し、トレッドの後端をイメージセンサにより検
出してトレッドの長さを測定する方法が提案されいて
る。しかし、光反射型センサがトレッド搬送時の振動や
測定部のトレッドエッジ傾斜部のたるみにより検出不良
を起こし、高い精度でトレッドの長さを測定することが
困難であると言う問題があった。Further, in Japanese Patent Laid-Open No. 61-14507,
A method has been proposed in which the front end of the bottom surface of the conveyed tread is detected by a light reflection type sensor and the rear end of the tread is detected by an image sensor to measure the length of the tread. However, there is a problem that it is difficult to measure the length of the tread with high accuracy because the light reflection type sensor causes a detection failure due to vibration during tread transportation and slack of the tread edge inclined portion of the measurement unit.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、トレ
ッド搬送時の振動や測定部のたるみによる検出不良を発
生することなく、常にトレッドの長さを高精度で測定す
ることが可能なタイヤトレッド長さ測定方法を提供する
ことにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a tire capable of constantly measuring the length of a tread with high accuracy without causing a detection failure due to vibration during conveyance of a tread or slack of a measuring section. It is to provide a tread length measuring method.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成する本発
明は、搬送されてくるトレッドの後端エッジを後端検出
器で検出し、この検出信号により、先端エッジに対面し
て配置されたシャッターカメラを作動させ、該シャッタ
ーカメラによりスリット光が前記先端エッジに対して交
差するように投光された先端エッジ部の映像を取り込
み、画像処理装置で前記投光されたスリット光の傾斜変
曲点を前記先端エッジとして判断し、該傾斜変曲点とシ
ャッターカメラの基準位置との距離を算出してトレッド
の長さを求めることを特徴とする。According to the present invention which achieves the above object, the trailing edge of a tread being conveyed is detected by a trailing edge detector, and the detection signal is used to face the leading edge. The shutter camera is actuated, the shutter camera captures the image of the leading edge portion projected so that the slit light intersects the leading edge, and the image processing apparatus tilts and inclines the projected slit light. It is characterized in that a point is determined as the leading edge and the distance between the inflection point and the reference position of the shutter camera is calculated to obtain the length of the tread.
【０００７】[0007]
【作用】上述したように本発明は、スリット光を先端エ
ッジ部に投光し、これをシャッターカメラでその映像を
取り込み、画像処理装置で該スリット光の傾斜変曲点を
先端エッジと判断してトレッドの長さを測定するため、
測定部のトレッドにたるみが発生した場合であっても、
検出不良や測定不能を起こすことなく、トレッドの長さ
を精度良く確実に測定することが出来る。また、Ｓ／Ｎ
比を上げるための強い光源も必要ない。As described above, according to the present invention, the slit light is projected to the leading edge portion, the image thereof is captured by the shutter camera, and the inclination inflection point of the slit light is determined as the leading edge by the image processing device. To measure the length of the tread,
Even if slack occurs in the tread of the measurement unit,
The length of the tread can be measured accurately and reliably without causing detection failure or measurement failure. Also, S / N
No strong light source is needed to increase the ratio.
【０００８】[0008]
【実施例】以下、添付図面に基づいて本発明の実施例を
説明する。図１は本発明のタイヤトレッド長さ測定方法
に用いられる装置の１例を示す概略説明図で、１は長手
方向断面が略平行四辺形のトレッド、２はコンベヤベル
ト、３トレッド１の後端エッジ１ａを検出する後端検出
器で、この後端検出器３は光電センサ等の透過型センサ
等から構成されている。４はトレッド１の先端エッジ１
ｂに対面し、コンベヤベルト２から離間した位置に配置
されたシャッターカメラ、５は先端エッジ１ｂに対して
交差するようにスリット光を投光するレーザー等の指向
性の強い投光器、６はシャッターカメラ４及び投光器５
を載置した移動フレーム等の位置決め装置、７はシャッ
ターカメラ４の座標位置を検出する座標検出器、８はシ
ャッターカメラ４で読み取られた画像を演算処理する画
像処理装置である。Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic explanatory view showing an example of an apparatus used for a tire tread length measuring method of the present invention, 1 is a tread having a substantially parallelogram in a longitudinal cross section, 2 is a conveyor belt, and 3 is a rear end of a tread 1. The trailing edge detector detects the edge 1a, and the trailing edge detector 3 is composed of a transmission type sensor such as a photoelectric sensor. 4 is the tip edge 1 of the tread 1
A shutter camera, which is located at a position facing away from the conveyor belt 2 facing b, 5 is a projector having a strong directivity such as a laser that projects a slit light so as to intersect the tip edge 1b, and 6 is a shutter camera 4 and floodlight 5
Is a positioning device such as a moving frame on which is mounted, 7 is a coordinate detector that detects the coordinate position of the shutter camera 4, and 8 is an image processing device that performs arithmetic processing on the image read by the shutter camera 4.
【０００９】本発明のタイヤトレッド長さ測定方法は、
上述した装置を用いて以下のように行うことが出来る。
即ち、矢印Ａ方向にコンベヤベルト２上を搬送されてき
たトレッド１の後端１ａを後端検出器３で検出する。こ
の検出信号によりシャッターカメラ４を作動させ、該シ
ャッターカメラ４により、図２に示すようにスリット光
Ｓがトレッド１の後端エッジ１ａと同じ長手方向にある
面１Ａの先端エッジ１ｂに対して交差するように投光さ
れた先端エッジ部１Ｂの映像を取り込む。先端エッジ部
１Ｂは先端エッジ１ｂを境に、平面部１ｃと傾斜部１ｄ
とからなるため、スリット光Ｓはその境である先端エッ
ジ１ｂでスリット光Ｓの延びる傾斜方向を変更し、傾斜
変曲点Ｓａを形成する。The tire tread length measuring method of the present invention comprises:
It can be performed as follows using the above-mentioned apparatus.
That is, the trailing edge 1a of the tread 1 conveyed on the conveyor belt 2 in the direction of arrow A is detected by the trailing edge detector 3. The shutter camera 4 is actuated by this detection signal, and the shutter camera 4 causes the slit light S to intersect the leading edge 1b of the surface 1A in the same longitudinal direction as the trailing edge 1a of the tread 1 as shown in FIG. The image of the front edge portion 1B projected as described above is captured. The front edge portion 1B has a flat surface portion 1c and an inclined portion 1d with the front edge 1b as a boundary.
Therefore, the slit light S changes the inclination direction in which the slit light S extends at the front edge 1b which is the boundary, and forms the inclination inflection point Sa.
【００１０】この像をシャッターカメラ４を介して画像
処理装置８に取り込み、該画像処理装置８で画像処理し
て、スリット光Ｓの傾斜変曲点Ｓａを先端エッジ１ｂと
判断し、傾斜変曲点Ｓａとシャッターカメラ４の座標基
準位置との搬送方向における距離ａを算出する。そし
て、予めインプットされた後端検出器３とシャッターカ
メラ４の座標基準位置との搬送方向における距離Ｌ（図
３）、及び後端検出器３が後端１ａを検出し、シャッタ
ーカメラ４を作動させるまでの作動遅れに相当するオフ
セット距離ｂをあわせて、トレッド１の長さを演算して
求める（トレッドの長さ＝Ｌ＋ａ＋ｂ）。このトレッド
１の長さは、図示せぬＣＲＴやプリンター等に出力され
る。This image is taken into the image processing device 8 via the shutter camera 4, and the image processing device 8 performs image processing to judge the tilt inflection point Sa of the slit light S as the leading edge 1b, and tilt tilt inflection. A distance a in the transport direction between the point Sa and the coordinate reference position of the shutter camera 4 is calculated. Then, the distance L between the rear end detector 3 and the coordinate reference position of the shutter camera 4 input in advance in the transport direction (FIG. 3), and the rear end detector 3 detects the rear end 1a, and the shutter camera 4 is activated. The length of the tread 1 is calculated and calculated by adding the offset distance b corresponding to the operation delay until it is performed (tread length = L + a + b). The length of the tread 1 is output to a CRT, a printer or the like (not shown).
【００１１】測定されるトレッド１の長さが変更された
場合は、位置決め装置６によりシャッターカメラ４及び
投光器５の位置を図１に示す矢印Ｂまたは矢印Ｂ´方向
に移動させて上述同様に測定を行う。その際、座標検出
器７により移動したシャッターカメラ４の座標位置が検
出され、画像処理装置８にインプットされた距離Ｌが、
搬送方向に移動した分だけ変更される。When the length of the tread 1 to be measured is changed, the position of the shutter camera 4 and the projector 5 is moved by the positioning device 6 in the direction of arrow B or arrow B'shown in FIG. I do. At that time, the coordinate position of the shutter camera 4 moved by the coordinate detector 7 is detected, and the distance L input to the image processing device 8 is
It is changed by the amount moved in the transport direction.
【００１２】シャッターカメラ４及び投光器５の配置
は、上述したように先端エッジ部１Ｂに面し、先端エッ
ジ１ｂが測定可能であれば特に限定されないが、画像処
理装置８での演算を容易にするため、図４に示すよう
に、シャッターカメラ４をトレッド１の搬送方向に対し
て垂直に配置すると共に、投光器５のスリット光Ｓがト
レッド１の平面部１ｃでシャッターカメラ４の座標基準
位置を通る線ｒーｒ上で、トレッド１の搬送方向に沿っ
て平行に投光されるのが好ましい。また、シャッターカ
メラ４と投光器５との搬送方向と直交する方向における
離間角度θは３０°以上することが好ましいが、傾斜変
曲点Ｓａが形成可能な角度であれば特に限定されない。The arrangement of the shutter camera 4 and the projector 5 is not particularly limited as long as it faces the leading edge portion 1B and the leading edge 1b can be measured, as described above, but facilitates the calculation in the image processing device 8. Therefore, as shown in FIG. 4, the shutter camera 4 is arranged perpendicularly to the conveyance direction of the tread 1, and the slit light S of the projector 5 passes through the coordinate reference position of the shutter camera 4 on the flat surface portion 1c of the tread 1. It is preferable that the light is projected in parallel on the line r-r along the transport direction of the tread 1. Further, the separation angle θ in the direction orthogonal to the transport direction between the shutter camera 4 and the light projector 5 is preferably 30 ° or more, but is not particularly limited as long as the inclination inflection point Sa can be formed.
【００１３】このように本発明は、スリット光Ｓを先端
エッジ部１Ｂに投光し、これをシャッターカメラ４でそ
の映像を取り込み、画像処理装置８で該スリット光Ｓの
傾斜変曲点Ｓａを先端エッジ１ｂと判断してトレッド１
の長さを測定するため、測定部のトレッドにたるみが発
生した場合であっても、検出不良を起こすことなく、ト
レッド１の長さを確実に測定することが可能である。ま
た、Ｓ／Ｎ比を上げるための強い光源も必要ない。As described above, according to the present invention, the slit light S is projected on the tip edge portion 1B, the image thereof is captured by the shutter camera 4, and the tilt inflection point Sa of the slit light S is captured by the image processing device 8. Judging as the leading edge 1b, tread 1
Since the length of the tread 1 is measured, it is possible to reliably measure the length of the tread 1 without causing a detection failure even when the tread of the measuring portion has a slack. Moreover, a strong light source for increasing the S / N ratio is not necessary.
【００１４】[0014]
【発明の効果】本発明は上記のように、スリット光を投
光した先端エッジ部の映像をシャッターカメラで取り込
み、画像処理装置で該スリット光の傾斜変曲点を先端エ
ッジと判断してトレッドの長さを測定するため、測定部
のトレッドにたるみが発生した場合であっても、たるみ
に起因する検出不良や測定不能を抑制し、トレッドの長
さを常に精度良く測定することが出来る。As described above, according to the present invention, the image of the leading edge portion where the slit light is projected is captured by the shutter camera, and the image processing apparatus judges that the inflection point of the slit light is the leading edge and the tread. Since the length of the tread is measured, even if slack occurs in the tread of the measuring portion, it is possible to suppress the detection failure and the unmeasurable property due to the slack, and always measure the length of the tread with high accuracy.
【図１】本発明のタイヤトレッド長さ測定方法に用いら
れる装置の１例を示す概略説明図である。FIG. 1 is a schematic explanatory view showing an example of an apparatus used in a tire tread length measuring method of the present invention.
【図２】スリット光が投光されたトレッドの先端エッジ
部の説明図である。FIG. 2 is an explanatory diagram of a tip edge portion of a tread on which slit light is projected.
【図３】画像処理装置で演算されるトレッド長さを説明
する説明図である。FIG. 3 is an explanatory diagram illustrating a tread length calculated by the image processing apparatus.
【図４】シャッターカメラと投光器の好ましい位置関係
を示す説明図である。FIG. 4 is an explanatory diagram showing a preferable positional relationship between a shutter camera and a light projector.
１ トレッド １Ｂ 先端エッジ
部 １ａ 後端エッジ １ｂ 先端エッジ ３ 後端検出器 ４ シャッターカ
メラ ８ 画像処理装置 Ｌ 距離 Ｓ スリット光 Ｓａ 傾斜変曲点1 tread 1B front edge part 1a rear edge 1b front edge 3 rear edge detector 4 shutter camera 8 image processing device L distance S slit light Sa slope inflection point
Claims (1)
後端検出器で検出し、この検出信号により、先端エッジ
に対面して配置されたシャッターカメラを作動させ、該
シャッターカメラによりスリット光が前記先端エッジに
対して交差するように投光された先端エッジ部の映像を
取り込み、画像処理装置で前記投光されたスリット光の
傾斜変曲点を前記先端エッジとして判断し、該傾斜変曲
点とシャッターカメラの基準位置との距離を算出してト
レッドの長さを求めるタイヤトレッド長さ測定方法。1. A trailing edge detector detects a trailing edge of a conveyed tread, and a shutter camera disposed facing the leading edge is operated by the detection signal, and slit light is emitted by the shutter camera. The image of the tip edge portion projected so as to intersect the tip edge is captured, and the tilt inflection point of the projected slit light is determined as the tip edge by the image processing device, and the tilt inflection is performed. A tire tread length measurement method that calculates the distance between a point and the reference position of the shutter camera to obtain the tread length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11287193A JPH06323817A (en) | 1993-05-14 | 1993-05-14 | Measuring method for tire tread length |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11287193A JPH06323817A (en) | 1993-05-14 | 1993-05-14 | Measuring method for tire tread length |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06323817A true JPH06323817A (en) | 1994-11-25 |
Family
ID=14597619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11287193A Pending JPH06323817A (en) | 1993-05-14 | 1993-05-14 | Measuring method for tire tread length |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06323817A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6765191B2 (en) | 2001-08-20 | 2004-07-20 | The Goodyear Tire & Rubber Company | Roller switch |
| WO2006019070A1 (en) * | 2004-08-20 | 2006-02-23 | Bridgestone Corporation | Method of measuring length of band-form member and device therefor |
| WO2011142462A1 (en) * | 2010-05-14 | 2011-11-17 | 株式会社ブリヂストン | Band-shaped member shape measuring method, and device therefor |
| JP2013151119A (en) * | 2012-01-25 | 2013-08-08 | Bridgestone Corp | Method and device for measuring tread length |
| CN107860319A (en) * | 2017-11-28 | 2018-03-30 | 杭州朝阳橡胶有限公司 | A kind of tyre surface measuring motion and method applied to feed frame |
-
1993
- 1993-05-14 JP JP11287193A patent/JPH06323817A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6765191B2 (en) | 2001-08-20 | 2004-07-20 | The Goodyear Tire & Rubber Company | Roller switch |
| WO2006019070A1 (en) * | 2004-08-20 | 2006-02-23 | Bridgestone Corporation | Method of measuring length of band-form member and device therefor |
| US7466431B2 (en) | 2004-08-20 | 2008-12-16 | Bridgestone Corporation | Method and apparatus of measuring a length of a band-shaped member |
| JP4818924B2 (en) * | 2004-08-20 | 2011-11-16 | 株式会社ブリヂストン | Length measuring method and apparatus for belt-shaped member |
| WO2011142462A1 (en) * | 2010-05-14 | 2011-11-17 | 株式会社ブリヂストン | Band-shaped member shape measuring method, and device therefor |
| JP2013151119A (en) * | 2012-01-25 | 2013-08-08 | Bridgestone Corp | Method and device for measuring tread length |
| CN107860319A (en) * | 2017-11-28 | 2018-03-30 | 杭州朝阳橡胶有限公司 | A kind of tyre surface measuring motion and method applied to feed frame |
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