200413118 (1) 玖、發明說明 【發明所屬之技術領域】 本發明是關於欲將呈彼此對頭狀態的兩件金屬製管利 用聯結器連結之際，把用以卡合該聯結器之環狀溝、成型 在前述金屬製管上之溝成型裝置。 【先前技術】 欲將兩件金屬製管以彼此對頭的狀態連結之際，已往 採用例如於第5及6圖所示般的聯結器。該聯結器1 00是 由：從兩側分別嵌插金屬製管90之環狀的密封構件1 〇 1 ，及、收容該密封構件1 0 1並與形成在各金屬製管90上 之環狀溝9 1卡合俾連結該等之環狀的聯結器主體1 02構 成。還有，第5圖是表示聯結器槪略結構的立體圖，而第 6圖是其彳寅斷面剖視圖。 前述聯結器本體1 02是以第1構件1 0 5、第2構件 106及第3構件107之三件構件組成，並具有使該等構件 按可互相擺動的狀態藉由連結銷I 〇 8連續地連結之構造， 且藉著利用固定銷1 〇9接合第1構件：1 〇5之端部與第3構 件]0 7之端部而形成圓筒狀之內周面（收容部1 0 3 )。又 ，在該收容部1 〇 3之兩端部形成分別往周方向的環狀卡合 突起1 04。 就這樣的，當利用該聯結器100時，將金屬製管90 從前述密封構件1 〇 1之兩端分別嵌插之後，以如捲繞該密 封構件1 0 1般地裝著聯結器主體1 0 2，再藉由固定銷1 0 9 -5- (2) (2)200413118 接合第]構件1 〇5之端部及第3構件]07之端部，使密封 構件]01壓接於金屬製管90，而該金属製管90彼此之間 的接合部藉密封構件]0 ]予以密封之同時，前述卡合突起 1 0 4會卡合於形成在各金屬製管9 〇上之環狀溝9 ]而將兩 者連結。 而作爲將前述環狀溝9 1成型於金屬製管9 0之裝置來 說，已往有如第7及8圖中所示之構造者爲眾所週知。第 7圖表示屬於已往例之溝成型裝置槪略構成之側面剖視圖 ’弟8圖則爲第7圖中箭頭所不C方向之側視圖。 如於第7及8圖所示，前述溝成型裝置80是配備： 由圓筒狀之構件構成，而以插入金屬製管9 0的狀態支撐 該金屬製管9 0內周面之支撐輥8 1，及、將支撐輥8 1能 以其軸中心自由旋轉的方式支撐之支撐機構（未圖示）， 及、將該支撐輥8 ]以軸爲中心旋轉之旋轉驅動裝置（未 圖示），及、配設在前述支撐輥8 1上方之壓輥8 2，及、 以旋轉自如方式支撐該壓輥82並能使其朝上下方向昇降 之昇降機構8 3而構成。 前述壓輥 82之外周面上沿著周方向形成有環狀之凸 條部82a，另一方面，於支撐輥8 1之外周面上沿著周方 向形成有環狀的凹槽8 1 a。而該等壓輥82及支撐輥8 !， 是以其軸線能處於互相平行且在同一垂直面內的位置，更 且，使前述軸線方向中之前述凸條部8 2 a及凹槽8丨a之位 置能互相一致爲條件予以配設。 依前述般構成之溝成型裝置8 0時’首先’將支撐輥 -6- (3)200413118 8 ]相雙 使之呈 降機構 剖5 82a 現被前 繼 其軸爲 金屬製 屬製管 就 夾持、 82a與 部往內 所示之 在 環狀溝 方升起 管90。 【發明 然 設在支 圓度等 就 丨地插入欲進行環狀溝91成型之金屬製管90內， 現其內周面被支撐輥8]所支撐之狀態後，利用昇 83將壓輥82往下方降下。藉此，壓輥之凸條 抵接到金屬製管90之外周面，使該金屬製管9〇呈 述壓輥8 2及支撐輥8〗予以夾持、擠壓之狀態。 而，利用旋轉驅動裝置（未圖示）使支撐輥8]以 中心旋轉時，被壓輥82及支撐輥8〗夾持、擠壓的 ^ 9 0朝與支撐輥8丨同方向旋轉之同時，壓接於金 9 〇之壓輥8 2會朝與其相反的方向旋轉。 這樣，金屬製管90即維持被壓輥82及支撐輥81 濟壓的狀態而旋轉，進而受到壓輥82之凸條部 支撐輕8 1之凹槽8丨a之模加工作用致產生其外周 側凹進之塑性變形，最後就在其端部形成如第7圖 環狀溝9 1。 金屬製管90之端部形成環狀溝9 1如前所述。又， 9 1被形成之後，啓動昇降機構83使壓輥82往上 ’爾後從支撐輥8 1拆下形成有環狀溝9 1之金屬製 內容】 而’前述之傳統的溝成型裝置8 0，由於壓輥8 2是 撐輕8 1的正上面，所以會有如前述環狀溝9 ;[之真 的形精度無法加工成高精度的問題存在。 是’當壓輥82壓接於正在旋轉的金屬製管90時， -7- (4) (4)200413118 如於第8圖所示，會在金屬製管9〇與壓輥82雙方之接觸 «「」間產生摩擦，因此之故，由於旋轉切線方向之摩擦力而 使壓$昆8 2處於其位置容易朝該切線方向移位之狀態，換 言之’就是具有後讓傾向，且由於有這種後讓移位致使施 加到金屬製管90之擠壓力不穩定，導致形成之環狀溝9 ] 之形狀精度不良。 如前所述，雖然按旋轉自如方式設置壓輥 82，譬如 說利用軸承類使壓輥8 2處於旋轉自如的狀態，也無法將 該軸承內部的摩擦抵抗完全消除，結果，在金屬製管9 〇 及J1輕8 2彼此之接觸部的摩擦抵抗亦無法完全消除。 就這樣，倘在金屬製管90上形成如此形狀精度不佳 的環狀溝9 1時，當欲使用前述聯結器1 〇〇連結兩件金屬 製管90之際，會產生在聯結器主體]02之卡合突起ι〇4 與環狀溝9 1間之卡合不良情況，使密封構件1 〇 1的擠壓 不足’致密封構件101無法充分壓接在金屬製管90之外 周面’結果，會產生密封不良引起之液漏、金屬製管90 從聯結器主體1 02脫落等類問題。 鑑於如前所述之實情。本發明是以提供能對金屬製管 形成具形狀精度高之環狀溝的溝成型裝置爲目的。 〔用以解決課題之手段〕 爲能達成前述之目的’本發明是屬於用以成型環狀溝 於金屬製管端部外周面之裝置，其特徵在於：具備有， 由圓筒狀構件構成，其外周面具有沿周方向形成之環 -8- (5) 200413118 狀凹槽，並以保持插入前述金屬製管的狀態 製管內周面之支撐輥；及 以軸中心旋轉自如之方式水平地支撐前 撐手段；及 用以使前述支撐輥依軸中心旋轉的旋轉 由圓筒狀構件構成，在其外周面配備沿 環狀凸條部之同時，尙以依據其軸線與前述 成爲平行，且在前述軸線方向上之前述凸條 支撐輥之凹槽之位置成爲一致爲條件配設在 方之壓輥；及 按照旋轉自如的方式支撐前述壓輥之同 使該壓輥朝上下方向昇降之昇降手段； 並且，使前述壓輥朝下方下降，且利用 撐輥將前述金屬製管夾持及擠壓，藉以在前 端部外周面將環狀溝予以成型之方式構成之 ’配設前述壓輥於包含前述支撐輥之軸線在 基準’朝與前述支撐輥之旋轉方向的相反側 者。 根據本發明，首先將支撐輥相對向地插 溝之金屬製管並作成其內周面被支撐輥所支 利用昇降手段使壓輥朝下方下降。藉此，壓 壓接到金屬製管之外周面，使該金屬製管呈 撐輥夾持與擠壓之狀態。 繼之’利用旋轉驅動手段使支撐輥以其 來支撐該金屬 述支撐輕之支 驅動手段；及 周方向形成之 支撐輥之軸線 部位置與前述 前述支撐輥上 時，配備用以 前述壓輥與支 述金屬製管之 溝成型裝置中 內的垂直面爲 偏置之位置處 入欲成型環狀 撐的狀態後， 輥之凸條部就 現被壓輥與支 軸爲中心旋轉 -9- (6) (6)200413118 時’藉壓輥及支撐輥所夾持與擠壓的金屬製管即朝與支撐 輕相同方向旋轉之同時，壓接在金屬製管上之壓輥則朝與 其相反的方向旋轉。 就這樣’金屬製管隨即保持被壓輥及支撐輥所夾持與 濟壓之狀態旋轉，藉此承受壓輥之凸條部及支撐輥之凹槽 的成型作用而使其外周部產生朝內側凹陷之塑性變形，結 果在其端部形成環狀溝。 可是’如前所述，於壓輥配設於支撐輥正上面之情況 下’由於受到當壓輥壓接到金屬製管之際產生於雙方間朝 旋轉切線方向之摩擦力作用，使壓輥容易往前述切線方向 移位，意即容易後讓，因此之故，對金屬製管之擠壓力呈 現不穩定’致有環狀溝之形狀精度惡化的問題產生。 因此’本發明之溝成型裝置就配設前述壓輥於以包含 前述支撐輥之軸線在內的垂直面爲基準，並朝與前述支撐 輥之旋轉方向相反側偏置之位置處者。 作成這樣時，當壓輥壓接於金屬製管之際，由於與該 金屬製管間之摩擦，壓輥將承受靠近含支撐輥之軸線的前 述垂直面般之方向的作用力，而朝該方向移位。就是壓輥 接受對支撐輥吃進方向之摩擦力並朝同方向移位者。藉此 壓輥對金屬製管之擠壓力增加，且成爲穩定者，結果可使 成型於金屬製管之環狀溝的形狀精度成爲高精度者。 又’本發明是在前述構成之外、增添於前述支撐輥下 方位置、朝直交於其軸線方向以特定的間隔距離配設之一 對擋接於前述金屬製管外周面而用以從下方支撐該金屬製 -10- (7)200413118 管之補助輥的 倘若僅用 製管穩定的支 撐時，就能夠 又，本發 手段、用以調 用以穩定 屬製管之外徑 將壓輥之偏置 而能使壓輥對 更且，本 以前述垂直面 壓輥靠近前述 前述金屬製管 段的溝成型裝 按照前述 置將會在該金 是成爲在金屬 管之長度較長 (與形成環狀 壓輥之偏置側 的狀態，由於 惡化之慮。 由是，倘 溝成型裝置。 支撐輥支撐金屬製管時 撐，惟以支撐輥及一對 穩定地支撐旋轉的金屬 明是在前述構成之外， 節前述壓輥之偏置位置 對金屬製管之擠壓力的 而異，惟若設置前述位 位置因應金屬製管外徑 金屬製管之擠壓力成爲 發明是在前述構成之外 爲基準，配設於較前述 金屬製管之軸線方向的 外周面而用以抑制該金 置° 般地偏置壓輕時，壓輥 屬製管之內周面與支撐 製管與支撐輥間產生空 的時候，當壓輥壓接之 溝側相反側之端部）將 移位，構成該金屬製管 這原故，有位置精度會 設置前述止擺手段時， ，難於將旋轉的金屬 補助輥之3體予以支 製管。 增添具備有位置調節 的溝成型裝置。 前述偏置量，雖依金 置調節手段時，能夠 而適當適切地調節， 更穩定者。 ，增添具備有配設在 壓輥爲外側、且較該 中央處，使其擋接於 屬製管搖擺之止擺手 壓接到金屬製管的位 輥不接觸的位置、就 隙的位置，於金屬製 際，金屬製管之他端 以該壓接點爲中心往 對支撐輥之軸線擺偏 從前述環狀溝之管端 於壓輥壓接之際，可 - 11 · (8) (8)200413118 藉該止擺手段抑制金屬製管之前述他端往壓輥之偏置側移 位，而能有效地防止該金屬製管隨壓輥之壓接產生擺偏。 【實施方式】 〔發明之實施形態〕 茲依照所佐圖面將本發明之具體實施形態說明如下。 第1圖爲表示本發明之一實施形態所屬溝成型裝置槪略構 成的橫斷面剖視圖，第2圖爲第1圖中箭頭所指A方向 之正面圖。又第3圖是表示本實施形態所屬支撐輥、壓輥 及止擺輥與金屬製管間的支撐、抵接狀態之說明圖’第4 圖爲第3圖中箭頭所指B-B方向側面剖視圖。又，在本例 中是欲在前述之金屬製管90上成型環狀溝9 1者。 如於第1至4圖所示，本例之溝成型裝置1，具備有 :以被插入金屬製管90之狀態支撐其內周面之支撐輥1 〇 ，及、以旋轉自如的方式支撐著支撐輥1 〇之軸承部1 7 ’ 及、使支撐輥1 〇以軸中心旋轉之驅動馬達2 0，及、配設 在前述支撐輥1 〇上方的壓輥3 0，及、以旋轉自如的方式 支撐著壓輥3 0之軸承部3 5，及、使軸承部3 5朝垂直方 向（箭頭所示方向）昇降的油壓缸3 8，及、配設於前述 支撐輥I 〇上方之止擺輥4 0 ’及 '配設於前述支撐輥1 0 下方之一對補助輥5 0、5 0 ’及、用以配設前述支撐輥10 、驅動馬達2 0及各補助輥5 0之機座5，及、固裝於該機 座5上用以配設前述油壓缸3 8及止擺輥4 0之機架6等。 前述支撐輥1 〇是屬由小徑部及大徑部形成的級形軸 - 12- (9) (9)200413118 ，詳細地說，是由：利用前述軸承部1 7以旋轉自如的方 式支撐的旋轉軸]5，及、對該旋轉軸1 5之小徑部依序外 嵌，鍵定位之面板】】、第]輥1 2、隔離件1 3及第2輥 1 4 5及、螺合於在前述&轉軸1 5之小徑部側之端部形成 之螺紋孔而將外嵌於該小徑部之前述面板n、第1輥1 2 、隔離件1 3及第2輥]4往其軸方向鎖緊之固定螺栓1 6 等所構成。 前述面板1 1具有較設爲同徑的第1輥12及第2輥 1 4之外徑爲大之外徑，當前述金屬製管90安裝到該第1 輥1 2及第2輥1 4的時候，其端面會擋接於該面板Η之 端面，使旋轉軸1 5朝軸方向之位置被定位。 又’前述第1輥1 2在其外周面具備沿周方向形成之 環狀凹槽I 2 a。 又，前述旋轉軸]5之大徑部側端部，以聯軸器22爲 介連接於前述驅動馬達2 0之輸出軸2 1，並藉該驅動馬達 2 〇使前述旋轉軸1 5以其軸中心旋轉。 又’前述軸承部1 7是由以適當間隔距離配設之兩件 軸承1 7 b及用以支撐該軸承} 7 b之軸承外殼1 7 a構成。 前述壓輥3 0是由藉前述軸承部3 5以旋轉自如的方式 支撐之旋轉軸3 2，及對該旋轉軸3 2外嵌，鍵定位之輥主 體3 1構成’並以其軸線與前述支撐輥1 〇之軸線平行的方 式配設。而輥主體3丨在其外周面具備沿周方向形成之環 狀凸條部3 1 b，且以該凸條部3 1 b朝前述軸線方向之位置 能與則述第1輥〗2之凹槽1 2 a的位置成爲一致的方式配 -13- (10) 200413118 設。 而且有$π此構成之壓輕3 0，乃如於第2及第 示，以含有前述支撑輕1 〇之軸線的垂直面爲基準 在與該支擦輥1 〇之旋轉方向（圖示例爲左旋轉） 偏置X量之位置處。 又該偏置量X宜能因應金屬製管9 0外徑大/]、 爲理想，且宜隨外徑之加大而加大爲理想。 用以支撐前述壓輥3 0之軸承部3 5 ’是由分別 述旋轉軸3 2兩端部之軸承3 7、3 7 ’及保持該軸承 的保持構件3 6所構成。而保持構件3 6是由於其本 之楔形部3 6 a與固設在前述軸箱1 7 a上之導向構f 屬燕尾槽2 6卡合而可昇降自如，其上端部與前述 3 8之活塞桿3 8 a連結，並藉該油壓缸3 8朝垂直方 〇 這樣的利用前述軸承部3 5，導向構件2 5及油 而構成將前述壓輥3 0以旋轉自如的方式支撐，並 垂直方向昇降的昇降機構。 前述止擺輥4 〇是利用軸承4 6使其以軸中心旋 ，且其軸線又與前述支撐輥！ 〇之軸線成平行之方 支撐之同時，以包含前述支撐輥1 0之軸線的垂直 準’使其較前述壓輥3 0爲外側且在前述軸線方向 與前述第2輥1 4相〜致的方式配設，進而能利用 構4 1朝垂直方向昇降者。 該昇降機構4 ]是由：隔著特定的間距在上下 4圖所 $，配設 相反側 、改變者 丨支撐前 3 7、37 :身形成 "5所 油壓缸 向昇降 壓缸3 8 使其朝 轉自如 式予以 面爲基 的位置 昇降機 方同時 -14 - (11) (11) 設置、 4 °之貫通孔4 3 a，且前述螺紋槽4 5 a螺 > 構件4 2爲介固設於前述機架6，一 4 3 心 及、其/ ^，及、固設在該固定板43、43間之螺母 板4， Λ .丨'爿面具備螺紋槽4 5 a ,插通於形成在前述各 螺母44 > _门 …,蛛合於 ^ 、调節軸45，及、其下面固設前述軸承46 搞板 4 7，杯 _ 4 ^ 及、固設在該支撐板47上用以連結前述調 5下牺部之連結構件48，及、嵌插於形成在前述各 板 4 3、4 3 u -V ^ _ ^貝通扎4 3 b，且其下端部固設於前述 板4 7之導向桿4 9構成。又，前述連結構件4 8是依 許前述調節軸45作旋轉，但限制其朝軸方向之移動 向連結。 這樣地按前述所構成之昇降機構4 1時，藉將前 節軸4 5以軸中心朝正反方向旋轉，使該調節軸4 5由 前述螺母44之螺合關係而往其軸方向，就是上下方 動，使連結在其下端部之支撐板4 7、止擺輥4 0等等 調節軸4 5 —起昇降。又，在支撐板4 7上尙固設如前 之嵌插於固定板43之貫通孔43b中之導向桿49，並 該導向桿49與貫通孔43b彼此之嵌合關係，得能抑 撐板4 7於昇降之際的搖擺。 前述補助輥5 0是擋接於前述金屬製管90之外周 用以支撐該金屬製管9 0者，爲依照能以軸中心旋轉 且其軸線與前述支撐輥1 0之軸線成平行的方式配設 時，還藉由昇降機構5 1對其朝垂直方向之位置進行 對固 44， 固定 前述 之支 節軸 固定 支撐 照容 的方 述調 於與 向移 與該 所述 利用 制支 面而 自如 之同 調節 -15- (12) (12)200413118 又，該昇降機構5 1是由：沿前述支撐輥1 〇之軸方向 隔以特定之間距而平行地設置、再以軸承5 2爲介將前述 各補助輥5 0 ' 5 0按旋轉自如的方式支撐之一對支撐板5 3 、5 3，及、用以支撐該支撐板5 3、5 3下面的支撐軸5 4、 5 4，及、分別配設在前述機架6兩側之導向桿5 6、5 6， 及、分別固設在前述機架6之兩側面、用以分別支撐前述 導向桿56、56之支撐構件5 5、5 5，及、分別固設於前述 支撐板5 3之兩側面供分別嵌插前述導向桿5 6、5 6之導向 管57、57，及、使前述支撐軸54、54朝上下方向移動之 驅動部（未圖示）等等構成。 如此的按照該昇降機構5 1時，由於利用前述驅動部 (未圖示）使前述支撐軸5 4、5 4朝上下方向移動而使藉 該支撐軸54、54所支撐之支撐板53、53及補助輥50、 5 〇與該支撐軸5 4、5 4 —起朝上下方向移動，因此，支撐 金屬製管90之補助輥50、50的位置就能適當地加以調節 。又，因有導向桿5 6與導向管5 7間彼此之嵌合關係而能 抑制支撐板5 3於昇降之際的搖擺。 根據如前述般構成之本例所屬溝成型裝置1時，首先 在欲成型環狀溝9 1之金屬製管90內相對地插入支撐輥 1 〇，成爲其端部擋接於面板1 1之端面的狀態後，利用前 述昇降機構5 1適當地調節補助輥5 0、5 0朝上下方向之位 置，使內周面被支撐輥1 〇所支撐，且外周面藉該補助輥 50、50支撐之前述金屬製管9〇的軸線與支撐輥10之軸 線成平行。 -16- (13) (13)200413118 繼而利用前述昇降機構41使止擺輥4〇往下方降下， 並讓其外周面呈現擋接於前述金屬製管9 0外周面之狀態 。又，在此時以讓止擺輥4 0呈輕輕擋接金屬製管9 0之狀 態者爲理想。若作成以過強的力道壓接之狀態時，因金屬 製管9 0之軸會對支撐輥1 0之軸偏擺之故，不理想。 爾後驅動油壓缸3 8，將壓輥3 0往下方移動而使該壓 輥30壓接於金屬製管90外周面。由此，金屬製管90就 成爲被壓輥3 0及第1輥1 2所夾持與擠壓的狀態。 其次利用驅動馬達2 0使支撐輥1 0以其軸中心旋轉時 ，被壓輥3 0與第1輥1 2所夾持與擠壓的金屬製管9 0會 朝與支撐輥〗〇同方向旋轉之同時，壓接於金屬製管9 0之 壓輥3 0就朝與其相反方向旋轉。 如斯的金屬製管90就以被壓輥3 0與第1輥12所夾 持與擠壓的狀態旋轉，由是其外周面承受壓輥3 0之凸條 部3 1 b及第1輥1 2之凹槽1 2a的成型作用而產生朝內側 凹陷之塑性變形，最後的結果，在其端部形成環狀溝9 1 〇 而依照如此方式形成環狀溝9 1之後，停止驅動馬達 2 〇，繼之順序使壓輥3 0、止擺輥4 0及補助輥5 0回歸原 位置後，把金屬製管90從支撐輥1 0取出。 可是，如前所述，當壓輥3 0設在第1輥1 2之正上面 的時候，於壓輥3 0壓接到金屬製管90之際，由於產生在 兩者間朝旋轉切線方向之摩擦力，致使壓輥3 0往前述切 線方向移位而容易有偏離之弊，因此之故對金屬製管90 -17- (14) 200413118 之擠廳力呈不穩定而產生環狀溝91之形狀精度惡 問題。 所以在本例裡，就把壓輥3 0配設在以含支撐車 軸線的垂直面爲基準且朝與該支撐輥1 0之旋轉方 側偏置的位置上。 作成這樣後，於壓輥3 0壓接到金屬製管9 〇之 於與該金屬製管9 0間之摩擦，壓輥3 0承受像要接 1輥〗2軸線之垂直面方向之作用力F而往該方向 就是壓輥3 0承受對第1輥1 2吃進之方向的摩擦力 相同方向移位。由是壓輥3 0對金屬製管9 0之濟壓 、並且成爲穩定者，而能使成型於金屬製管90之 9 1具有高的彤狀精度。 另一方面，倘使壓輥按前述般偏置時，壓輥3 於金屬製管9 0之位置則在該金屬製管9 0之內周面 輥]2彼此未接觸之位置，就是在金屬製管9 0與I 1 2彼此間無空隙產生之位置，若金屬製管90之長 情況下，當壓輥3 0壓接之際，金屬製管90之他端 成環狀溝9 ]之側相反側之端部隨之以該壓接點爲 壓輥3 0之偏置側移位，致使該金屬製管90對支老 之軸線呈偏擺狀態，是故有前述環狀溝9 1從管端 精度會惡化之慮。 所以在本例中設置前述止擺輥4 〇。由於設置 擺輥4 0，於壓輥3 0壓接之際，可將金屬製管9 0 他端會往壓輥3 0之偏置側移位之事，利用該止擺_ 化等的 i 1 0之 向相反 際，由 近含第 移位。 ，而往 力增加 環狀溝 〇壓接 與第1 5 1輥 度較長 (與形 中心朝 Μ昆ίο 之位置 了該止 之前述 ! 4 0予 -18- (15) (15)200413118 以抑制’得能藉壓輥3 0之壓接有效地防止在該金屬製管 90產生偏擺之弊。 雖就本發明之一實施形態說明如前所述，惟本發明可 抹取之具ffe悲樣並未限定於此者。 例如也可以作爲具備可調節前述壓輥3 0之偏置量的 手段之構成。倘若設置此調節手段時，得能將壓輥3 0之 偏置位置因應金屬製管9 0之外徑作適當適切地調節，而 使壓輥30對金屬製管90之擠壓力更爲穩定者。 又，作爲前述調節手段之構造，例如，利用滑動導向 構件等類之移動導向機構將前述機架6以能朝偏置方向移 動自如的方式支撐，並利用螺桿機構使機架6能朝偏置方 向移動者亦爲可採用之構造。但在這情況時，就前例而言 ，有必要將固設於軸承部1 7之軸承箱的前述導向構件2 5 固設於機架6。 【圖式簡單說明】 第〗圖爲表示本發明之一實施形態所屬溝成型裝置之 槪略構成橫斷面剖視圖。 第2圖是在第1圖中箭頭所示A方向之正面圖。 第3圖表示本實施形態所屬支撐輥、壓輥及止擺輥與 金屬製管彼此之間的支撐、擋接狀態之說明圖。 第4圖是在第3圖中箭頭所示B-B方向之橫斷面圖。 第5圖是表示聯結器槪略構成之立體圖。 第6圖是表示聯結器槪略構成之橫斷面圖。 -19- (16) (16)200413118 第7圖表示傳統技術所屬溝成型裝置槪略構成之橫斷 面圖。 第8圖是在第7圖中箭頭所示C方向之側面圖。 〔圖號說明〕 ]:溝成型裝置 5 :機座 6 :機架 ]0 ： 支撐輥 ]2 ： 第]輥 ]2 a :凹槽 ]3 ： 隔離件 1 4 ： 第2輥 ]5 ： 旋轉軸 2 0·· 驅動馬達 3 0: 壓輥 3 1 ： 輥主體 3 1b :凸條部 3 5: 軸承部 3 7: 油壓缸 40 ： 止彳能輕 4 1: 昇降機構 50 ： 補助輥 5 ]： 昇降機構 90 ： 金屬製管 -20- 200413118200413118 (1) Description of the invention [Technical field to which the invention belongs] The present invention relates to an annular groove for engaging the coupler when the two metal pipes in a state facing each other are connected by the coupler. A groove forming device formed on the aforementioned metal pipe. [Prior Art] When two metal pipes are to be connected to each other in a head-to-face relationship, a coupler such as shown in Figs. 5 and 6 has been conventionally used. The coupler 100 is formed by: a ring-shaped sealing member 1 0 1 in which a metal pipe 90 is inserted from both sides; and a ring-shaped sealing member 1 01 which accommodates the sealing member 1 0 and is formed on each metal pipe 90. The groove 91 is engaged with the ring-shaped coupler main body 102. Fig. 5 is a perspective view showing a schematic structure of the coupler, and Fig. 6 is a cross-sectional view thereof. The above-mentioned coupling body 102 is composed of three components of the first component 105, the second component 106, and the third component 107, and has these components continuous with each other by a connecting pin I 08 Ground connection structure, and the first member is joined by the fixing pin 1 09: the end of the 105 and the end of the third member] 0 7 to form a cylindrical inner peripheral surface (receiving part 1 0 3 ). In addition, ring-shaped engaging protrusions 104 are formed on both ends of the receiving portion 103 in the circumferential direction. As such, when using the coupling 100, the metal pipe 90 is inserted from both ends of the aforementioned sealing member 101, and then the coupling body 1 is mounted as if the sealing member 101 was wound. 0 2, and then the fixing pin 1 0 9 -5- (2) (2) 200413118 joined the end of the first member 1 05 and the end of the third member] 07, so that the sealing member] 01 was crimped to the metal The tube 90 is formed, and the joints between the metal tubes 90 are sealed by a sealing member] 0]. At the same time, the above-mentioned engaging protrusions 104 are engaged with a ring formed on each metal tube 90. Groove 9] to connect the two. As a device for forming the annular groove 91 in the metal pipe 90, a structure as shown in Figs. 7 and 8 has been conventionally known. Fig. 7 is a side cross-sectional view showing a schematic configuration of a trench forming device of the conventional example; Fig. 8 is a side view of the direction C indicated by the arrow in Fig. 7; As shown in FIGS. 7 and 8, the groove forming device 80 is equipped with a support roller 8 formed of a cylindrical member and supporting the inner peripheral surface of the metal pipe 90 in a state where the metal pipe 90 is inserted. 1, and a support mechanism (not shown) capable of supporting the support roller 8 1 in a freely rotatable manner at the center of the shaft, and a rotation driving device (not shown) that rotates the support roller 8] around the axis. And a pressure roller 82 arranged above the support roller 81 and a lifting mechanism 83 which supports the pressure roller 82 in a freely rotatable manner and can be raised and lowered in the vertical direction. On the outer peripheral surface of the pressing roller 82, a ring-shaped convex portion 82a is formed along the circumferential direction. On the other hand, a ring-shaped groove 8 1a is formed on the outer circumferential surface of the support roller 81 along the circumferential direction. The pressure rollers 82 and the support rollers 8! Are such that their axes can be parallel to each other and in the same vertical plane, and furthermore, the aforementioned convex portion 8 2 a and the groove 8 in the aforementioned axial direction can be made. The positions of a can be set on the condition that they are consistent with each other. The groove forming device configured as described above was "first" at 8 o'clock to support the roller -6- (3) 200413118 8] phase to make the lowering mechanism cut 5 82a is now clamped by its metal shaft Hold the tube 90 in the annular groove side as shown in Figure 82a. [Invention is set in a state that the circularity of the support is inserted into the metal pipe 90 where the annular groove 91 is to be formed, and its inner peripheral surface is supported by the support roller 8]. Then, the pressure roller 82 is lifted by 83. Lower down. Thereby, the ridges of the pressing roller abut against the outer peripheral surface of the metal pipe 90, so that the metal pipe 90 is held and squeezed by the pressing roller 8 2 and the support roller 8. However, when the support roller 8] is rotated at the center by a rotary driving device (not shown), the ^ 90, which is pinched and squeezed by the pressure roller 82 and the support roller 8, is rotated in the same direction as the support roller 8 The pressure roller 8 2 crimped to the gold 90 will rotate in the opposite direction. In this way, the metal tube 90 is rotated while maintaining the pressured state by the pressure roller 82 and the support roller 81, and is further subjected to the mold processing effect of the convex portion of the pressure roller 82 to support the groove 8 丨 a of the light 81, resulting in its outer periphery The side recess is plastically deformed, and finally an annular groove 91 is formed at its end as shown in FIG. 7. The annular groove 91 is formed at the end of the metal pipe 90 as described above. In addition, after 9 1 is formed, the lifting mechanism 83 is activated to push the pressure roller 82 upward, and then remove the metal content formed with the annular groove 9 1 from the support roller 8 1] and the aforementioned conventional groove forming device 80 Since the pressure roller 8 2 is directly above the supporting light 81, there will be a problem that the annular groove 9 as described above cannot be processed into high accuracy. Yes' When the pressure roller 82 is crimped to the metal pipe 90 being rotated, -7- (4) (4) 200413118 As shown in FIG. 8, the metal pipe 90 and the pressure roller 82 are in contact with each other. «There is friction between" ". Therefore, the pressure in the tangential direction of rotation causes the pressure of Kun 8 2 to be in a state where its position is easy to shift toward the tangent direction. In other words, it has a tendency to give way, and because of this Displacement after seeding makes the pressing force applied to the metal pipe 90 unstable, resulting in poor shape accuracy of the formed annular groove 9]. As described above, although the pressure roller 82 is provided in a rotatable manner, for example, if the pressure roller 82 is rotated freely by using bearings, the frictional resistance inside the bearing cannot be completely eliminated. As a result, the metal tube 9 The frictional resistance of the contact portions between 〇 and J1 light 8 2 cannot be completely eliminated. In this way, if the annular groove 91 having such a poor shape accuracy is formed on the metal pipe 90, when the two pieces of the metal pipe 90 are to be connected using the aforementioned coupling 100, the coupling body will be generated] The poor engagement between the engagement protrusion 02 and the annular groove 9 1 of 02 caused insufficient compression of the sealing member 101 and the result was that the sealing member 101 could not be sufficiently pressed against the outer peripheral surface of the metal pipe 90. This may cause problems such as liquid leakage caused by poor sealing, and the metal pipe 90 falling from the coupling body 102. Given the facts as mentioned earlier. The purpose of the present invention is to provide a groove forming device capable of forming a ring groove with a high shape accuracy for a metal pipe. [Means for Solving the Problem] In order to achieve the aforementioned object, the present invention belongs to a device for forming an annular groove on an outer peripheral surface of an end portion of a metal pipe, and is characterized by being provided with a cylindrical member, The outer peripheral surface is provided with a ring formed in the circumferential direction-8- (5) 200413118-shaped groove, and a support roller for making the inner peripheral surface of the pipe is maintained in a state of being inserted into the aforementioned metal pipe; and the shaft center can rotate freely horizontally Means for supporting the front support; and the rotation for rotating the support roller in the center of the shaft is formed by a cylindrical member, while the outer peripheral surface is provided with a ring-shaped convex portion, and is parallel to the foregoing according to its axis, and The pressure rollers arranged on the side are provided on the condition that the positions of the grooves of the convex support rollers in the axis direction are consistent; and the lifting and lowering of the pressure rollers in the up-down direction while supporting the pressure rollers in a freely rotating manner Means; the pressure roller is lowered downward, and the metal tube is clamped and squeezed by a support roller, so that the annular groove is formed on the outer peripheral surface of the front end portion. It is assumed that the pressure roller includes an axis including the support roller at a reference 'opposite to the rotation direction of the support roller. According to the present invention, first, a support pipe is inserted into a grooved metal pipe, and its inner peripheral surface is supported by the support roller. The pressing roller is lowered downward by a lifting means. Thereby, it is crimped to the outer peripheral surface of the metal pipe, so that the metal pipe is in a state of being pinched and pressed by the support roller. Followed by 'the use of rotary driving means to make the support roller support the metal support support with the support driving means; and when the axial position of the support roller formed in the circumferential direction and the aforementioned support roller, equipped with the aforementioned pressure roller and When the vertical surface inside the groove forming device for supporting metal pipes is in a state where an annular brace is to be formed at an offset position, the convex portion of the roller is now rotated by the pressure roller and the supporting shaft as a center-9- ( 6) (6) 200413118 At the same time, the metal tube clamped and squeezed by the pressure roller and the support roller rotates in the same direction as the support light, while the pressure roller crimped on the metal tube faces the opposite Direction rotation. In this way, the metal tube is rotated while maintaining the state of being clamped and pressed by the pressure roller and the support roller, thereby receiving the molding effect of the convex portion of the pressure roller and the groove of the support roller, so that the outer peripheral portion thereof faces inward The plastic deformation of the depression results in the formation of an annular groove at its end. However, as described above, in the case where the pressure roller is disposed directly above the support roller, the pressure roller causes the pressure roller to rotate in a tangential direction when the pressure roller is crimped to the metal pipe. It is easy to shift to the tangential direction, which means that it is easy to make back. Therefore, the problem that the pressing force on the metal pipe is unstable is caused by the shape accuracy of the annular groove. Therefore, the ditch forming apparatus of the present invention is provided with the pressing roller at a position offset from the side opposite to the rotation direction of the supporting roller based on the vertical plane including the axis of the supporting roller. When this is done, when the pressure roller is crimped to the metal tube, the pressure roller will bear the force in the direction of the vertical plane near the axis including the support roller due to the friction with the metal tube, Direction shift. That is, the pressure roller receives the frictional force in the feeding direction of the support roller and shifts in the same direction. As a result, the pressing force of the pressure roller against the metal pipe is increased and stabilized. As a result, the accuracy of the shape of the annular groove formed in the metal pipe can be made highly accurate. In addition, the present invention is in addition to the aforementioned structure, is added to a position below the aforementioned support roller, and is provided with a pair of blocks at a specific interval in a direction orthogonal to the axis direction thereof, and is used to support the outer peripheral surface of the metal pipe for supporting from below. The metal-made -10- (7) 200413118 tube auxiliary roller can only be used if the tube-making stable support is used. This method can be used to call the offset of the pressure roller to stabilize the outer diameter of the tube. In addition, the pair of pressing rollers can be changed. In addition, according to the foregoing arrangement, the groove forming device of the vertical surface pressing roller close to the aforementioned metal pipe section will be longer in the length of the metal pipe (and forming a ring-shaped pressing roller). The state of the offset side is due to deterioration. Therefore, if the groove forming device supports the metal pipe, the support roller and a pair of metal that stably support rotation are clearly outside the foregoing configuration. The offset position of the aforementioned pressure roller varies with the pressing force of the metal pipe. However, if the aforementioned position is set according to the pressing force of the metal pipe according to the outer diameter of the metal pipe, the invention is based on the outside of the aforementioned structure. Match When the offset pressure is lighter than the outer peripheral surface of the metal tube in the axial direction to suppress the metal placement, the pressure roller is a time when a space is generated between the inner peripheral surface of the tube and the support tube and the support roller. When the end on the side opposite to the groove side where the pressure roller is crimped will be shifted to form the metal tube, it is difficult to support the three parts of the rotating metal auxiliary roller when the position-precision means is provided. Control tube. Added groove forming device with position adjustment. Although the aforementioned offset amount can be adjusted appropriately and appropriately according to the adjustment means of the metal, it is more stable. It is added with a position where the pressure roller is arranged on the outer side of the pressure roller and is located at a position farther than the center, so that it is blocked from the position where the roller is not in contact with the metal tube when the swinging hand is crimped to the metal tube. In the case of metal, the other end of the metal tube is centered on the crimping point to the axis of the support roller. When the tube end is crimped from the tube end of the aforementioned annular groove, it may be-11 · (8) (8 200413118 By this means of swing prevention, the aforementioned other end of the metal tube is prevented from shifting to the offset side of the pressure roller, and the metal tube can be effectively prevented from being deflected due to the pressure contact of the pressure roller. [Embodiment] [Embodiment of the invention] A specific embodiment of the present invention will be described below according to the accompanying drawings. Fig. 1 is a cross-sectional cross-sectional view showing a schematic configuration of a groove forming apparatus according to an embodiment of the present invention, and Fig. 2 is a front view of the direction indicated by arrow A in Fig. 1. Fig. 3 is an explanatory view showing the supporting and abutting states between the support roller, pressure roller, and stop roller and the metal pipe according to this embodiment. Fig. 4 is a side sectional view in the direction of arrow B-B indicated by the arrow in Fig. 3; In this example, it is intended to form an annular groove 91 in the metal pipe 90 described above. As shown in FIGS. 1 to 4, the groove forming apparatus 1 of this example includes a support roller 10 that supports an inner peripheral surface of the groove forming apparatus 1 in a state of being inserted into a metal pipe 90, and is rotatably supported. The bearing portion 17 ′ of the support roller 10 and the drive motor 20 that rotates the support roller 10 at the center of the shaft, and the pressure roller 30 disposed above the support roller 10 and freely rotating It supports the bearing portion 35 of the pressure roller 30, and the hydraulic cylinder 38, which raises and lowers the bearing portion 35 in the vertical direction (in the direction shown by the arrow), and is arranged above the support roller I0. The swing rollers 40 'and' are arranged under one of the pair of auxiliary rollers 50, 50 'and the machine for disposing the aforementioned backup roller 10, the drive motor 20, and each of the auxiliary rollers 50. The base 5 and the frame 6 fixedly mounted on the base 5 are provided with the hydraulic cylinders 38 and the swing stopper 40 described above. The support roller 10 is a stepped shaft formed by a small-diameter portion and a large-diameter portion. (12) (9) (9) 200413118, specifically, is supported by the bearing portion 17 in a rotatable manner Rotation axis] 5, and the small-diameter part of the rotation axis 15 is sequentially embedded, and the key positioning panel is], the first] roller 1 2, the spacer 1 3, and the second roller 1 4 5 and the screw The threaded hole formed at the end of the small-diameter portion side of the aforementioned & shaft 15 is fitted to the aforementioned panel n, the first roller 1 2, the spacer 13 and the second roller which are externally fitted in the small-diameter portion] 4 It is composed of fixing bolts 1 6 etc. which are locked in the axial direction. The panel 11 has a larger outer diameter than the first roller 12 and the second roller 14 having the same diameter. When the metal tube 90 is attached to the first roller 12 and the second roller 1 4 At this time, its end surface will be blocked against the end surface of the panel Η, so that the position of the rotating shaft 15 in the axial direction is positioned. Furthermore, the aforementioned first roller 12 has an annular groove I 2 a formed in the circumferential direction on its outer peripheral surface. In addition, the end of the large-diameter portion of the aforementioned rotary shaft] 5 is connected to the output shaft 21 of the aforementioned drive motor 20 via a coupling 22, and the aforementioned rotary shaft 15 is driven by the drive motor 20 The center of the shaft rotates. Also, the aforementioned bearing portion 17 is composed of two pieces of a bearing 1 7 b arranged at an appropriate distance and a bearing housing 1 7 a to support the bearing} 7 b. The aforementioned pressure roller 30 is composed of a rotating shaft 32 supported by the aforementioned bearing portion 35 in a freely rotatable manner, and the rotating shaft 32 is externally fitted with a key positioning roller body 31, and its axis is connected to the foregoing The support rollers 10 are arranged so that the axes thereof are parallel. The roller body 3 丨 has an annular convex portion 3 1 b formed in the circumferential direction on its outer peripheral surface, and the position of the convex portion 3 1 b in the axial direction can be described as the concave of the first roller. 2 The positions of the grooves 1 2 a become uniformly arranged -13- (10) 200413118. Moreover, there is a light weight of 30, which is composed of $ π, as shown in the second and the first, based on the vertical plane containing the axis of the support light 10, the rotation direction of the rubbing roller 10 with the support (example of the figure) For left rotation) Offset X position. In addition, the offset amount X should ideally correspond to a metal pipe 90 with a large outer diameter], and should preferably increase as the outer diameter increases. The bearing portion 3 5 'for supporting the aforementioned pressure roller 30 is composed of bearings 37, 37, respectively at both ends of the rotating shaft 32, and a holding member 36, which holds the bearing. The holding member 36 can be raised and lowered freely because the wedge-shaped portion 3 6 a and the guide structure f fixed on the shaft box 17 a are engaged with the dovetail groove 2 6. The piston rod 3 8 a is connected, and the hydraulic cylinder 38 is oriented vertically. The bearing portion 35, the guide member 25, and the oil are used to support the pressure roller 30 in a rotatable manner. Lifting mechanism for vertical lifting. The above-mentioned swing stop roller 40 is rotated by the center of the shaft by using a bearing 46, and its axis is in turn with the aforementioned support roller! While the axis of 〇 is supported in parallel, the vertical alignment of the axis of the support roller 10 is used to make it outside of the pressure roller 30 and in the direction of the axis to the second roller 14. The system is arranged so that the person who can use the structure 41 can move up and down in the vertical direction. The lifting mechanism 4] is composed of: the upper and lower figures shown in FIG. 4 with a certain distance between them, and the opposite side is provided, and the changer supports the front 3, 7, 37: the body is formed, and the 5 hydraulic cylinders are raised and lowered to the hydraulic cylinder 3 8 At the same time, it is lifted to the position where the surface is based on the lift. At the same time, -14-(11) (11) is provided with a 4 ° through hole 4 3 a, and the aforementioned thread groove 4 5 a screw > member 4 2 is the medium It is fixed on the aforementioned frame 6, a 4 3 center, its / ^, and a nut plate 4 fixed between the fixing plates 43 and 43. Λ. 丨 'surface is provided with a thread groove 4 5 a, inserted through The above-mentioned nuts 44 > _ doors ... are assembled on the ^, the adjusting shaft 45, and the above-mentioned bearing 46 is fixed below the plate 46, the cup _ 4 ^ and is fixed on the supporting plate 47 The upper connecting member 48 for connecting the lower sacrifice part 5 is inserted and formed on each of the plates 4 3, 4 3 u -V ^ _ ^ Betonza 4 3 b, and the lower end part is fixed on The aforementioned plate 47 is constituted by a guide rod 49. In addition, the connecting member 48 is allowed to rotate in accordance with the adjustment shaft 45, but its movement in the axial direction is restricted to be connected. In this way, according to the lifting mechanism 41 formed as described above, by rotating the front section shaft 45 in the center of the shaft in the forward and reverse directions, the adjustment shaft 45 is moved in the axial direction by the screwing relationship of the nut 44, that is, up and down. Move it sideways to raise and lower the supporting plate 47, swing roller 40, and so on, which are connected to its lower end, and the adjusting shaft 45. In addition, a guide rod 49 inserted into the through hole 43b of the fixed plate 43 as before is fixed on the support plate 47, and the fitting relationship between the guide rod 49 and the through hole 43b can suppress the support plate. 4 7 Swing on the rise and fall. The auxiliary roller 50 is connected to the outer periphery of the metal pipe 90 to support the metal pipe 90. The auxiliary roller 50 is arranged in such a manner that it can rotate around the axis center and its axis is parallel to the axis of the support roller 10. When it is set, the position in the vertical direction is also fixed 44 by the lifting mechanism 51, and the above description of fixing the support shaft of the support shaft can be adjusted and moved freely with the use of the support surface. The same adjustment -15- (12) (12) 200413118 The lifting mechanism 51 is provided in parallel with a certain distance along the axis direction of the aforementioned support roller 10, and then the bearing 5 2 Each of the aforementioned auxiliary rollers 50'50 supports one pair of supporting plates 5 3 and 5 3 in a freely rotatable manner, and supporting shafts 5 4, 5 4 for supporting the supporting plates 5 3, 5 3, and , Guide rods 5 6 and 5 6 respectively disposed on both sides of the frame 6, and support members 5 5 respectively fixed on the two sides of the frame 6 to support the guide rods 56 and 56 respectively, 5 5 and, respectively, fixed on both sides of the support plate 5 3 for inserting the guide rods 5 6 and 5 6 respectively. Guide tubes 57, 57, and that the support shaft 54, 54 in the vertical direction of movement of the drive unit (not shown) and the like configured. In accordance with the lifting mechanism 51 as described above, the support shafts 53 and 53 supported by the support shafts 54 and 54 are moved in the up-and-down direction by the driving unit (not shown). Since the auxiliary rollers 50 and 50 and the supporting shafts 5 4 and 5 4 move upward and downward together, the positions of the auxiliary rollers 50 and 50 supporting the metal pipe 90 can be adjusted appropriately. In addition, due to the fitting relationship between the guide rods 56 and the guide tubes 57, it is possible to suppress the swing of the support plate 5 3 during the lifting. According to the groove forming device 1 of this example configured as described above, first, a support roller 10 is inserted into the metal pipe 90 of the annular groove 91 to be formed oppositely, and the end portion thereof is blocked against the end face of the panel 11 After the state, the position of the auxiliary rollers 50 and 50 in the vertical direction is appropriately adjusted by using the aforementioned lifting mechanism 51 so that the inner peripheral surface is supported by the supporting roller 10 and the outer peripheral surface is supported by the auxiliary rollers 50 and 50. The axis of the metal tube 90 is parallel to the axis of the support roller 10. -16- (13) (13) 200413118 The aforementioned lifting mechanism 41 is then used to lower the swing stop roller 40 downward, and the outer peripheral surface thereof is in a state of blocking the 90 outer peripheral surface of the metal pipe. At this time, it is preferable that the swing stop roller 40 is in a state of lightly blocking the metal pipe 90. If it is made into a state of being crimped with an excessively strong force, the axis of the metal tube 90 is deflected to the axis of the support roller 10, which is not ideal. Thereafter, the hydraulic cylinder 38 is driven, and the pressure roller 30 is moved downward to press-contact the pressure roller 30 to the outer peripheral surface of the metal pipe 90. As a result, the metal tube 90 is in a state of being pinched and squeezed by the pressure roller 30 and the first roller 12. Next, when the driving roller 20 is used to rotate the support roller 10 at its axis center, the metal tube 90 held and squeezed by the pressure roller 30 and the first roller 12 will face the same direction as the support roller. Simultaneously with the rotation, the pressure roller 30 pressed against the metal pipe 90 is rotated in the opposite direction. Such a metal tube 90 rotates while being pinched and squeezed by the pressure roller 30 and the first roller 12, and the outer peripheral surface thereof receives the convex portion 3 1 b of the pressure roller 30 and the first roller. The plastic deformation of the groove 1 2a of 1 2 causes a plastic deformation toward the inner side. As a result, an annular groove 9 1 0 is formed at the end portion. After the annular groove 9 1 is formed in this manner, the driving motor 2 is stopped. ○, after returning the pressing roller 30, the stop roller 40 and the auxiliary roller 50 to their original positions in this order, the metal tube 90 is taken out from the support roller 10. However, as described above, when the pressure roller 30 is disposed directly above the first roller 12 and the pressure roller 30 is crimped to the metal pipe 90, it is generated in the direction of the tangential rotation between the two. The frictional force causes the pressure roller 30 to shift in the tangential direction and is liable to deviate. Therefore, the squeezing force of the metal pipe 90 -17- (14) 200413118 is unstable and an annular groove 91 is generated. The shape accuracy is bad. Therefore, in this example, the pressure roller 30 is disposed at a position offset from the rotation side of the support roller 10 with reference to a vertical plane including the axis of the support vehicle. After doing this, the pressure roller 30 is crimped to the metal pipe 90, and the friction between the pressure roller 30 and the metal pipe 90, the pressure roller 30 is subjected to the force in the direction of the vertical plane of the 2 axis like 1 roller F. In this direction, the pressure roller 30 is displaced in the same direction as the frictional force in the direction in which the first roller 12 is fed. Since the pressing roller 30 presses the metal pipe 90 and becomes a stable person, it is possible to make the 91 formed in the metal pipe 90 1 with high precision. On the other hand, if the pressure rollers are biased as described above, the position of the pressure roller 3 at the position of the metal tube 90 is within the inner surface of the metal tube 90]. The positions where the tubes 90 and I 12 have no gap between each other. If the metal tube 90 is long, when the pressure roller 30 is crimped, the other end of the metal tube 90 will form a ring groove 9]. The end of the opposite side is then displaced with the pressure contact point as the offset side of the pressure roller 30, so that the metal pipe 90 is deflected to the axis of the support, so the aforementioned annular groove 9 1 There is a concern that the accuracy of the pipe end will deteriorate. Therefore, in the present example, the aforementioned stop roller 40 is provided. Since the pendulum roller 40 is provided, when the pressure roller 30 is crimped, the other end of the metal pipe 90 can be shifted to the offset side of the pressure roller 30, and the i The direction of 10 is opposite, shifted from near-contained. The forward force increases the annular groove. The crimping is longer and the 151st roll is longer (with the center of the shape toward the position of M Kunlong). The above mentioned stop! 4 0 予 -18- (15) (15) 200413118 to Suppression can effectively prevent the deflection of the metal tube 90 by the pressure contact of the pressure roller 30. Although the embodiment of the present invention has been described as described above, the present invention can be wiped with ffe The sadness is not limited to this. For example, it can also be used as a structure provided with a means for adjusting the offset amount of the aforementioned pressure roller 30. If this adjustment means is provided, the offset position of the pressure roller 30 can be adapted to the metal The outer diameter of the pipe 90 is adjusted appropriately and appropriately, so that the pressing force of the pressing roller 30 against the metal pipe 90 is more stable. Also, as a structure of the aforementioned adjustment means, for example, a sliding guide member or the like is used. The moving guide mechanism supports the aforementioned frame 6 in a manner capable of moving freely in the offset direction, and a screw mechanism is also applicable to those who can move the frame 6 in the offset direction. However, in this case, the previous example is used. In terms of the above, it is necessary to guide the aforementioned bearing box fixed to the bearing portion 17 The pieces 2 5 are fixed to the frame 6. [Brief description of the drawings] The first figure is a cross-sectional cross-sectional view showing a schematic configuration of a groove forming device according to an embodiment of the present invention. The second figure is an arrow in the first figure A front view showing the direction A. FIG. 3 is an explanatory view showing the supporting and blocking states between the support roller, the pressure roller, the stop roller, and the metal pipe to which the embodiment belongs. FIG. 4 is a view illustrating FIG. A cross-sectional view in the direction of BB indicated by the middle arrow. Fig. 5 is a perspective view showing a schematic configuration of the coupler. Fig. 6 is a cross-sectional view showing a schematic configuration of the coupler. -19- (16) (16) 200413118 FIG. 7 is a cross-sectional view showing a schematic configuration of a groove forming device belonging to the conventional technology. FIG. 8 is a side view in the direction of C indicated by an arrow in FIG. 7 [Illustration of drawing number]: groove forming device 5: Frame 6: frame] 0: support roller] 2: first roller] 2 a: groove] 3: spacer 1 4: second roller] 5: rotary shaft 2 0 ·· drive motor 3 0: pressure roller 3 1: Roller body 3 1b: Rib part 3 5: Bearing part 3 7: Hydraulic cylinder 40: Stopper light 4: Lifting mechanism 50: Auxiliary roll 5 ]: Lifting mechanism 90: Metal tube -20- 200413118