1331088 九、發明說明 【發明所屬之技術領域】 本發明是關於自動網版印花機的刮板壓力調節裝置， 更詳細而言，關於刮板在網版加壓時可精度良好且重現性 良好地進行壓力調節的刮板壓力調節裝置。 【先前技術】 • 自動網版印花機中，在掃描導板內的刮板載體上保持 著刮板。刮板在與被印花布的搬運方向的直角方向移動進 行印花。刮板是藉網版相對於環形皮帶以預定的壓力（以 下’稱爲「刮板壓力」）推壓的狀態下，進行印花移動。 以往’自動網版印花機爲了調節刮板壓力，具備調節 刮板的高度位置的螺絲。該螺絲是以手動作業進行操作。 因此，最初的刮板壓力是以經驗來調節。並且，一邊監視 印花狀態’數次進行刮板壓力的調節。 • 刮板壓力的調節不但是左右印花品質最重要因素，且 不能找出正確的刮板壓力，其結果有賴於作業員的熟練與 經驗。因此，不能獲得刮板壓力相關的正確數據，不足以 達到其重現性。 曰本特許公開平成5年第42659號揭示有可自動調節 刮板壓力的刮板壓力調節.裝置。該刮板壓力調節裝置控制 刮板的高度’控制對於環形皮帶的刮板的下壓量，藉以調 節刮板壓力。該裝置爲了控制刮板的高度，藉著外加反饋 功能的小型馬達使得刮板升降移動。驅動該小型馬達使刮 -4- 1331088 板下降，當刮板前端接觸到環形皮帶表面時檢測上述小型 馬達產生的過電流値，將過電流產生時的刮板高度位置設 定在刮板的加壓原點位置。將此刮板加壓原點位置數據記 憶在控制裝置的內部記憶體，以該刮板加壓原點位置爲基 準，驅動上述小型馬達，控制刮板從刮板加壓原點位置向 下方移動的量，藉此控制刮板壓力。但是，檢測小型馬達 的過電流値的方法中，從故意產生過電流即會有導致馬達 容易發生故障的問題。 【發明內容】 本發明爲了解決上述以往的問題，提供可重現性良好 調節刮板加壓量，並可降低故障頻度的自動網版印花機的 刮板調節裝置爲目的。 爲了達成上述目的，本發明爲可調節自動網版印花機 的刮板加壓量的刮板壓力調節裝置，其特徵爲，具有：使 刮板升降移動的汽缸；將供給上述汽缸的氣壓切換爲印花 用壓力或較此印花用壓力低壓的加壓原點確認用壓力的氣 壓迴路；藉著可控制數値的控制馬達可控制高度位置地進 行升降驅動，阻止上述刮板下降移動的活動檔件：檢測阻 止上述刮板下降移動時上述活動檔件的位置的第1檢測手 段；外部輸入上述活動檔件的預定高度方向位移量用的輸 入手段；及上述氣壓迴路從上述印花用壓力切換到加壓原 點確認用壓力時，上述第1檢測手段檢測的上述活動檔件 的位置作爲加壓原點位置，根據來自上述輸入手段的輸入 -5- 1331088 控制上述控制馬達的控制裝置。 又，上述氣壓迴路以更具備有切換爲上述印花用壓力 或上述加壓原點確認用壓力用的電磁式切換閥，上述控制 裝置具備運算部及記憶部，驅動上述控制馬達使上述活動 檔件下降到預定位置爲止之後，控制上述電磁式切換閥從 上述印花用壓力切換到加壓原點確認用壓力，使上述刮板 保持在加壓原點確認位置的狀態下驅動上述控制馬達使上 述活動檔件上升，接受上述第1檢測手段發出的檢測訊號 停止上述活動檔件的上升，設定該停止位置作爲加壓原點 位置爲佳。 又，上述檢測手段以包含與上述活動檔件一起移動的 檢測部，及與上述刮板一起移動藉上述檢測部所檢測的被 檢測部。 又，上述控制馬達爲超音波馬達，以更具備檢測該超 音波馬達轉動的轉角檢測部，及藉著來自上述轉角檢測部 的檢測訊號反饋控制上述超音波馬達的位置控制單元爲佳 〇 另外，理想的是更具有檢測上述活動檔件下降移動的 下限位置的機械原點位置的第2檢測手段，上述控制裝置 對應上述輸入手段的輸入，驅動上述控制馬達上述第2檢 測手段在檢測上述機械原點的上述活動檔件下降到預定位 置爲止之後，控制上述電磁式切換閥從上述印花用壓力切 換到加壓原點確認用壓力。 1331088 【實施方式】 針對本發明的實施形態，以下參閱第1 ~ 1 4圖加以說 明。 第1圖是表示自動網版印花機的印花單元的上視圖。 自動網版印花機是將印花單元2配置在環形皮帶1上。第 1圖中，印花單元2雖僅圖示1台，但是實際上，沿著該 環形皮帶的長方向，配置有複數台的印花單元2。印花單 元2，具備：配置在機台2上的導框4、4，及藉著導框4 、4可自由移動支撐的刮板載體5、5。並且，在導框4、4 安裝有支撐張貼網版支撐著模板6用的角構件7。 刮板載體5、5連結於配置在導框4、4內的定時皮帶 4a、4a上。定時皮帶4a、4a被捲繞在定時滑輪4b、4c、 4d、4e上。定時滑輪4b、4c被固定在連結軸4f，轉動驅 動連結軸4f的電動機（未圖示）收容在控制裝置8內。 橡膠刮板9及溢流刮板1 0被平行支撐在刮板載體5、 5上。圖示例中，溢流刮板（flood squeegee)爲硬質塑膠 製的刮板。溢流刮板並非使用於印花，而是作爲網版從布 帛脫離時，使色糊移動到原來位置用的刮板。溢流刮板爲 習知，具有微妙染斑（uneven dyeing)的防止效果。 第2圖爲放大刮板載體5表示的前視圖，第3圖爲刮 板載體5 —部份缺口表示的上視圖。說明的方便起見，圖 中，橡膠刮板9及溢流刮板10是以點線表示。參閱第2 圖及第3圖，刮板載體5、5具備橡膠刮板9及溢流刮板 10升降用的汽缸11、12。汽缸11' 12可自由升降地夾持 1331088 保持著各個橡膠刮板9及溢流刮板10用的刮板支架13、 14。刮板支架13、14可自由拆裝地安裝橡膠刮板9、溢流 刮板1 〇。 刮板載體5、5更具備阻止橡膠刮板9下降用的活動 檔件1 5。 活動檔件1 5藉著可數値控制的控制馬達1 6升降移動 。活動檔件15參閱顯示內部構造的第4圖時，螺絲結合 在螺桿17上。螺桿17在上端部固定有小齒輪18。小齒輪 18是與小齒輪19咬合。小齒輪19被固定在轉軸20的上 部。轉軸20的下端如第5圖表示，固定有圓錐齒輪21。 與圓錐齒輪21咬合的圓錐齒輪22的轉軸23爲控制馬達 16的轉動驅動軸。因此，藉著控制馬達16的正轉動驅動 或逆轉動驅動，螺桿17正逆轉動，使活動檔件15上升或 下降。如上述將控制馬達16的轉動運動轉換爲活動檔件 15的升降移動（往返直線運動）的運動轉換機構，不限於 圖不例的機構，也可以採用傳動帶、小齒輪•齒條機構等 其他種種的機構對該業者而言至爲明顯。 控制馬達1 6可以使用伺服馬達、步進馬達（脈衝馬 達）等習知的控制馬達》本實施形態中，從小型、低速_ 動、商扭矩、電源切斷時的制動性等的優點而言使用超：g： 波馬達。 刮板支架13 —但根據汽缸11的驅動而下降時，抵接 在活動檔件15上，其結果，阻止支撐在刮板支架13的橡 膠刮板9的下降移動，停止橡膠刮板。 -8- 1331088 本實施形態中，限定支撐溢流刮板1 0的刮板支架1 4 的下限位置的活動檔件15是如第4圖表示，藉著螺桿26 的轉動而升降移動。但是，螺桿26爲手動式，利用端部 的旋扭27來操作。當然，溢流刮板1〇也和橡膠刮板9同 樣，也可以作爲控制馬達驅動，但是省略圖示說明。 具備刮板支架13抵接在活動檔件15阻止橡膠刮板9 的下降移動時的檢測活動檔件1 5的位置的第1檢測手段 。第1檢測手段如第2圖及第3圖表示，具備固定在活動 檔件1 5的檢測部3 0與固定在刮板支架1 3檢測部3 0可檢 測的被檢測部3 1。 檢測部30在本實施形態中雖是使用接近開關，也可 以使用反應位差小的其他感測器，例如光電開關，也可以 使用限位開關。 被檢測部3 1爲金屬板彎曲加工所形成的檢查板。被 檢查部31是如第5圖表示，形成有通過固定在刮板支架 13用的固定螺絲32、32的長孔33，可藉此在高度方向進 行被檢測部3 1安裝位置的微調。 再者，也可以在刮板支架1 3安裝接近開關等的感測 器，在活動檔件1 5安裝藉著該感測器所檢測的檢測板。 如第2圖表示活動檔件15從刮板支架13的底面分開 時，被檢測部31從檢測部3 0分開，檢測部3 0雖是在 OFF的狀態，但是如第6圖表示，抵接活動檔件1 5與刮 板載體5阻止刮板載體5的下降時，被檢測部31位在檢 測部3 0的感應位置，檢測部3 0形成ON。 1331088 規定活動檔件15的活動下限的固定檔件35被固定在 刮板載體5上。固定檔件35被作爲設定活動檔件15的機 械原點位置之用。活動檔件15的機械原點位置在本實施 形態中，被設定在從固定檔件35的lmm上的位置’即活 動檔件1 5與固定檔件3 5的間隔形成1 mm的位置。 具備有檢測機械原點位置用的第2檢測手段。第2檢 測手段，參閱第6圖，具備：固定在刮板載體5的主體部 的檢測部36，及固定在活動檔件1 5可藉著檢測部36檢測 的被檢測部3 7。檢測部3 6在圖示例中，雖是採用接近開 關，但是也可以使用其他習知的感測器。被檢測部37是 藉L字型的金屬板所形成。保持檢測部36的支架38形成 有固定螺栓39插穿用的長孔40。藉著該長孔40，支架38 在上下方向進行固定位置的微調。 參閱第3圖時，藉著定時皮帶41使得與控制馬達16 的轉動同步轉動的轉角檢測部42被固定在刮板載體5內 。根據轉角檢測部42所發出的編碼器脈衝訊號，對於控 制馬達1 6進行反饋控制。 再者’使用步進馬達作爲控制馬達的場合由於內設轉 角檢測部，因此不需要另外設置轉角檢測部。 接著’針對使得橡膠刮板9及溢流刮板1 0升降移動 的汽缸11、12動作的氣壓迴路，參閱第7圖說明如下。 並且’第7圖中左右的氣壓迴路相同，因此賦予相同符號 說明之。 第7圖的氣壓迴路中，汽缸I〗、n是使橡膠刮板9 -10- 1331088 升降移動的汽缸，汽缸12、12爲溢流刮板10升降移動用 的汽缸。 從圖外的壓縮機所供給的壓縮空氣被設定在〇.6MPa ，以此壓力作爲原來壓力送至空氣流路50、51» 經由刮板支架13使橡膠刮板9上升移動用的壓縮空 氣，從空氣流路52、53通過岐管54、空氣流路55，供給 至汽缸1 1、1 1的上升側室。空氣流路5 5間隔有空氣供給 • 用的ON· OFF的電磁式切換閥56。 使橡膠刮板9下降用的壓縮空氣，從空氣流路52、53 經由岐管54，通過空氣流路60或61的其中一方，經由切 換到空氣流路60或61的電磁式切換閥62、空氣流路63 ，供給至汽缸1 1、U的下降側室。空氣流路63間隔有壓 力空氣供給用的ON . OFF的電磁式切換閥64。並且，空 氣流路60間隔有微壓設定用的減壓閥65。減壓閥65將減 壓閥65的二次側壓力減壓爲0.04MPa。 • 經由刮板支架14、14使溢流刮板10上升移動用的壓 縮空氣是從空氣流路52、53，通過空氣流路66、67供給 至汽缸的上升側室。使溢流刮板10下降移動用的氣壓是 從空氣流路52、53，通過空氣流路66、68供給至汽缸12 、1 2的下降側室。空氣流路66與空氣流路67、68之間， 間隔有溢流刮板10的上升與下降切換用的電磁式切換閥 69 ° 第7圖中’所有的電磁式切換閥爲不通電的非激磁狀 態’根據各個電磁式切換閥所具備的彈簧朝著第7圖的右 -11 - 1331088 圖施力。汽缸1 1、1 2的上升側室間隔有電磁式切換閥5 6 、67，可供給0.6MPa的壓縮空氣。汽缸11、12的下降側 室是從空氣流路63、68經由電磁式切換閥64、69，消音 器6“、69a，釋放到大氣中。因此，第7圖的氣壓迴路圖 是表示橡膠刮板9及溢流刮板1 0位在上升位置的狀態。 如第8圖表示，電磁式切換閥56、64、69 —旦激磁 時，汽缸11、12的上升側室的壓縮空氣經由電磁式切換 閥56、69，消音器56a、69b釋放到大氣中。其一方，從 空氣流路52、53通過空氣流路66、61，將0.6MPa的壓 縮空氣供給至汽缸11、12的下降側室。因此，第8圖的 氣壓迴路圖是表示橡膠刮板9及溢流刮板1〇位在下降位 置的狀態。〇.6MPa的壓力爲橡膠刮板9印花時的印花時 壓力。印花時壓力是根據橡膠刮板9的種類等，可適當加 以設定，最好是0.25〜0.6MPa。施加印花時壓力時，橡膠 刮板9的前端部是如第6圖表示，經由模框6推壓環形皮 帶1形成撓曲狀態。 接著，如第9圖表示，一旦使電磁式切換閥62激磁 時，從空氣流路6 1切換到空氣流路6 0，經減壓閥6 5減壓 至0.0 4MPa的壓縮空氣供給至汽缸11的下降側室。藉此 ，橡膠刮板1 1根據橡膠刮板1 1本身的彈性，使得橡膠刮 板11提升，如第11圖表示消除撓曲，形成接觸環形皮帶 1上的網版的狀態。位在此狀態的刮板位置形成橡膠刮板 9的加壓原點，以此位置爲基準，使刮板下降數mm，藉 此調節刮板的加壓量。如上述，由於活動檔件15限定著 -12- 1331088 橡膠刮板9的下降下限位置，使橡膠刮板9的加壓原點位 置形成活動檔件15的加壓原點位置。因此，經減壓閥65 所供給的氣壓爲加壓原點確認用壓力。加壓原點確認用壓 力是如上述可消除橡膠刮板9撓曲的壓力，設定大於0的 微壓力，例如可設定爲0.02〜O.IMPa。 針對具有上述構成的自動網版印花機的初期設定說明 如下。此外，溢流刮板10爲手動調節，因此省略其說明 ，僅針對橡膠刮板基準高度位置的初期設定方法說明。 首先，如下述初期設定機械原點位置。鬆開小齒輪1 8 、19的固定螺栓18a、19a (參閱第4圖），以手動將螺 桿19朝著順時鐘方向轉動，使活動檔件15下降，如第10 圖表示將與固定檔件3 5間的間隙調整爲1 mm。此時，藉 著被檢測部37沿著長孔40 (第6圖）微調節檢測部36的 高度位置使檢測部3 6形成「0」。再者，機械原點位置雖 然可設定在適當位置，但是一般是設定在活動檔件15活 動範圍的下端位置。 接著，進行檢測刮板的加壓原點位置用的初期設定。 使電磁式切換閥56、64激磁，使得橡膠刮板9下降。此 時的壓力爲〇.6MPa，橡膠刮板9的前端如第10圖表示藉 著加壓彎曲撓曲。在此使電磁式切換閥激磁，將空氣壓力 切換到0.04MPa時，藉著橡膠刮板9的彈力接觸環形皮帶 1的表面。在此，如第1圖表示，以手動將螺桿17朝著逆 時鐘方向轉動，使得活動檔件15上升到抵接溢流刮版13 爲止，活動檔件15抵接在刮板支架13時’沿著長孔33( -13- 1331088 第5圖）微調節被檢測部31的高度位置使檢測部30形成 丨'ON”。 調節完成後，鎖緊小齒輪18、19的固定螺栓18a、 19a，預先固定使其不致空轉。上述初期設定是在試運轉 前進行不須在通常運轉時進行。接著說明上述的初期設定 進行後的通常運轉時的操作。 將具有輸入手段的主操作盤8a (第1圖）的觸控面板 的刮板設定開關輸入到「ON」時，根據第13圖的流程圖 ，藉控制裝置8自動進行刮板加壓原點位置的確認動作。 刮板設定開關形成「ON」之前，可以從主操作盤8a的觸 控面板，預先設定値輸入來自加壓原點位置的刮板下壓量 (高度方向位移量）。 控制裝置 8具備所謂的 PLC(Programable Logic Controller) 70，如第14圖的控制程式圖表示，該PLC， 具備：處理控制程式的運算部71;記憶控制程式及輸入値 數據等的記憶部（memory ) 72 :及輸出入介面73、74等 。控制裝置8更具備控制馬達1 6的位置控制用位置控制 單元75 » 首先，主操作盤8a的刮板設定開關爲「ON」時（S1 )，從PLC70對於控制單元75傳送控制馬達16順時鐘方 向（CW)轉動的命令，控制單元75將預定的脈衝訊號傳 送到控制馬達，使控制馬達1 6與預定的轉動速度順時鐘 方向轉動控制馬達1 6 ( S 2 )。 控制馬達16順時鐘方向轉動時使活動檔件15下降移 -14- 1331088 動。到達機械原點位置處第2檢測手段的檢測部3 6形成 "ON"時（S3 )，從接受其檢測訊號的PLC70對於位置控 制單元75，傳送控制馬達16的停止訊號，停止來自位置 控制單元75的脈衝訊號，停止活動檔件15的下降移動（ S4 ) ° 接受第2檢測手段的檢測部36的"ON”訊號，將電磁 式切換閥値56、64、69激磁（S5 )，使橡膠刮板9下降 移動，以0.6MPa的氣壓將橡膠刮板9經由網版推壓在環 形皮帶1上。此時，橡膠刮板9的前端是形成彎曲撓曲的 狀態（參閱第1 〇圖）。 接著，將電磁式切換閥62激磁（S6)，使橡膠刮板 9下降的氣壓切換到0.04MPa，藉著橡膠刮板9的彈力， 從橡膠刮板9的前端彎曲撓曲的狀態，與未撓曲的狀態與 環形皮帶1上的網版接觸，使橡膠刮板9形成加壓原點位 置。 接著，控制馬達16朝著逆時鐘方向（CCW )轉動使 活動檔件1 5上升（S7 )。第1檢測手段的檢測部30以 PLC70接收"ON"訊號時（S8 )，從PLC70經由位置控制 單元75，停止控制馬達16 (S9)。該停止位置形成加壓 原點位置。 來自轉角檢測部42的編碼器脈衝是通過位置控制單 元75送到PLC70 (內的脈衝計數器），計算脈衝數。編 碼器脈衝的計算數被記憶在記憶部72內。到達加壓原點 位置時，將計算來自轉角檢測部42的編碼器脈衝的脈衝 -15- 1331088 計數器重設定爲「0」（S10)。 刮板設定開關設定爲「ON」之前，經由主操作盤 的觸控面板，預先輸入作爲刮板加壓數據（高度方向ί 量）的例如1.0〜9.9mm範圍內的設定値（S11)，計時 設定時間後（S12)，控制馬達16朝著順時鐘（CW) 向轉動（S13)，使活動檔件15下降。 對應活動檔件1 5的下降，來自轉角檢測部42的編 φ 器脈衝經由位置控制單元75傳送到PLC70，計算編碼 脈衝數。在運算部71將所計算的編碼器脈衝數換算成 動檔件15的移動距離，活動檔件15的下降量（高度方 位移量）一旦到達設定時（S 14 )，停止控制馬達1 6 S 1 5 )，停止活動檔件1 5。此外，位置控制單元75接 來自轉角檢測部42的編碼器脈衝，進行控制馬達1 6的 饋控制，藉此僅以設置値的距離，使活動檔件1 5下降 如此活動檔件15在輸入設定値後的預定位置停止。 # 停止活動檔件15之後，使電磁式切換閥56、64、 消磁（S16)，將電磁式切換閥62消磁（S17)，使刮 1 1上升到上升位置。 從以上的說明可明白，本發明爲了設定加壓原點位 ，是藉著將刮板升降的汽缸的氣壓切換爲印花用壓力與 壓原點確認用壓力加以進行，因此不會發生如以往檢測 電流而設定時的上述問題，可進行重現性良好的刮板壓 的調整。 8a 移 器 方 碼 器 活 向 ( 受 反 69 板 置 加 過 力 -16- 1331088 【圖式簡單說明】 胃1m是表示具備本發明所涉及的刮板壓力調節裝置 的自動網版印花機的印花單元的上視圖。 胃2圖是放大第1圖的主要部的刮板載體所表示的前 視圖。 第3圖爲第2圖的刮板載體一部份缺口所表示的俯視 圖。 ♦ 第4圖是表示第2圖的刮板載體內部構造的前視圖。 第5圖是表示第2圖的刮板載體內部構造的側視圖。 第6圖是表示第2圖的刮板載體的其他動作狀態的前 視圖。 第7圖是驅動第2圖的刮板載體的汽缸的氣壓迴路圖 〇 第8圖是表示第7圖的氣壓迴路的其他動作狀態圖。 第9圖是表示第7圖的氣壓迴路的其他動作狀態圖。 • 第1〇圖是表示第2圖的刮板載體的其他動作狀態的 前視圖。 第11圖是表示第2圖的刮板載體的其他動作狀態的 前視圖。 第12圖是表示第2圖的刮板載體的其他動作狀態的 前視圖。 第13圖是表示本發明所涉及的刮板壓力調節裝置的 控制流程的流程圖。 第14.圖是表示本發明所涉及的刮板壓力調節裝置的 -17- 1331088 控制 【主 塊圖。 元件符號說明】 環形皮帶 印花單元 機台 導框 :定時皮帶 〜4e :定時滑輪 刮板載體 模框 橡膠刮板 =溢流刮板 、：1 2 :汽缸 、14 :刮板支架 :活動檔件 :控制馬達 :螺桿 ' 1 9 :小齒輪 :轉軸 、2 2 :圓錐齒輪 :轉軸 =螺桿 :旋扭 -18- 1331088 :檢測部 :被檢測部 :固定檔件 :檢測部 :被檢測部 =支架 :固定螺栓 :長孔 =定時皮帶 :轉角檢測部 、5 1 :空氣流路 、5 3 :空氣流路 :岐管 :空氣流路 :電磁式切換閥 、61 :空氣流路 :電磁式切換閥 :空氣流路 :電磁式切換閥 a :消音器 :減壓閥 ~ 6 8 :空氣流路 :電磁式切換閥 a =消音器 -19-1331088 IX. Description of the Invention [Technical Field] The present invention relates to a squeegee pressure adjusting device for an automatic screen printing machine, and more particularly, the squeegee can be accurately and reproducibly improved when the screen is pressurized. A squeegee pressure regulating device that performs pressure regulation. [Prior Art] • In the automatic screen printing machine, the squeegee is held on the squeegee carrier in the scanning guide. The squeegee is printed in a direction perpendicular to the direction in which the printed cloth is conveyed. The squeegee is moved in a state in which the screen is pressed against the endless belt by a predetermined pressure (hereinafter referred to as "scraper pressure"). In the past, the 'automatic screen printing machine' has a screw that adjusts the height position of the squeegee in order to adjust the squeegee pressure. This screw is operated by manual operation. Therefore, the initial squeegee pressure is adjusted empirically. Further, the adjustment of the squeegee pressure is performed several times while monitoring the printing state. • Adjusting the squeegee pressure is not only the most important factor in the quality of the left and right prints, but also the correct squeegee pressure. The result depends on the skill and experience of the operator. Therefore, the correct data related to the squeegee pressure cannot be obtained, which is not sufficient to achieve reproducibility. A shovel pressure adjustment device that automatically adjusts the squeegee pressure is disclosed in Japanese Patent Laid-Open No. Hei. The squeegee pressure adjusting device controls the height of the squeegee to control the amount of depression of the squeegee of the endless belt, thereby adjusting the squeegee pressure. In order to control the height of the squeegee, the device moves the squeegee up and down by a small motor with a feedback function. Driving the small motor to lower the scraper -4- 1331088, detecting the overcurrent 产生 generated by the small motor when the front end of the squeegee contacts the surface of the endless belt, and setting the height of the squeegee when the overcurrent is generated to the pressurization of the squeegee Origin position. The scraper pressing origin position data is stored in the internal memory of the control device, and the small motor is driven based on the position of the scraping pressing origin, and the control scraper is moved downward from the scraping pressing origin position. The amount by which the squeegee pressure is controlled. However, in the method of detecting an overcurrent 値 of a small motor, there is a problem that the motor is likely to malfunction from the intentional occurrence of an overcurrent. SUMMARY OF THE INVENTION In order to solve the above conventional problems, the present invention has an object of providing a squeegee adjusting device for an automatic screen printing machine which can adjust the amount of squeegee pressurization with good reproducibility and can reduce the frequency of failure. In order to achieve the above object, the present invention is a squeegee pressure adjusting device capable of adjusting the amount of squeegee pressurization of an automatic screen printing machine, characterized by having: a cylinder for moving the squeegee up and down; and switching the air pressure supplied to the cylinder to a pressure circuit for printing, or a pressure circuit for confirming the pressure of the pressure origin of the printing pressure; and a control motor capable of controlling the number of points to control the height position to drive the lifting and lowering, and the movable member for preventing the downward movement of the squeegee a first detecting means for detecting a position of the movable member for preventing the downward movement of the squeegee; an input means for externally inputting a displacement amount of the movable member in a predetermined height direction; and the pneumatic circuit for switching from the printing pressure to the adding When the pressure for the origin confirmation is used, the position of the movable member detected by the first detecting means is used as the pressing origin position, and the control device for controlling the motor is controlled based on the input -1331088 from the input means. Further, the air pressure circuit further includes an electromagnetic switching valve that is switched to the printing pressure or the pressure originating pressure, and the control device includes a computing unit and a memory unit, and drives the control motor to move the movable member. After the pressure is lowered to the predetermined position, the electromagnetic switching valve is controlled to switch from the printing pressure to the pressure originating pressure, and the control motor is driven to maintain the pressure in the state where the squeegee is held at the pressure origin confirmation position. When the gear is raised, the detection signal from the first detecting means is stopped to stop the rise of the movable member, and it is preferable to set the stop position as the pressing origin position. Further, the detecting means includes a detecting portion that moves together with the movable member, and moves the detected portion detected by the detecting portion together with the squeegee. Further, the control motor is an ultrasonic motor, and further includes a rotation angle detecting unit that detects the rotation of the ultrasonic motor, and a position control unit that controls the ultrasonic motor by a detection signal feedback from the rotation angle detecting unit. Preferably, the second detecting means further includes a machine origin position for detecting a lower limit position of the downward movement of the movable member, and the control means drives the control means to detect the mechanical element in response to the input of the input means. After the movable member of the point has descended to the predetermined position, the electromagnetic switching valve is controlled to switch from the printing pressure to the pressure originating pressure. [Embodiment] Embodiments of the present invention will be described below with reference to Figs. 1 to 14. Fig. 1 is a top view showing a printing unit of an automatic screen printing machine. The automatic screen printing machine arranges the printing unit 2 on the endless belt 1. In the first drawing, although only one printing unit 2 is shown, actually, a plurality of printing units 2 are disposed along the longitudinal direction of the endless belt. The printing unit 2 includes: guide frames 4 and 4 disposed on the machine table 2, and squeegee carriers 5 and 5 which are freely movable and supported by the guide frames 4 and 4. Further, the guide members 4 and 4 are provided with a corner member 7 for supporting the screen-supporting screen 6 for supporting the template 6. The squeegee carriers 5, 5 are coupled to timing belts 4a, 4a disposed in the guide frames 4, 4. The timing belts 4a, 4a are wound around the timing pulleys 4b, 4c, 4d, 4e. The timing pulleys 4b and 4c are fixed to the connecting shaft 4f, and a motor (not shown) that rotationally drives the connecting shaft 4f is housed in the control device 8. The rubber blade 9 and the overflow blade 10 are supported in parallel on the blade carriers 5, 5. In the example of the figure, the flood squeegee is a hard plastic squeegee. The overflow squeegee is not used for printing, but as a squeegee for moving the color paste to its original position when the screen is detached from the cloth. The overflow squeegee is conventionally known to have the effect of preventing uneven dyeing. Fig. 2 is a front view showing the enlarged squeegee carrier 5, and Fig. 3 is a top view showing a portion of the squeegee carrier 5. For convenience of explanation, in the figure, the rubber blade 9 and the overflow blade 10 are indicated by dotted lines. Referring to Figures 2 and 3, the squeegee carriers 5, 5 are provided with rubber squeegees 9 and cylinders 11, 12 for lifting and lowering the squeegee 10. The cylinder 11'12 is freely slidably held 1331088. The squeegee holders 13, 14 for the respective rubber squeegees 9 and the overflow squeegee 10 are held. The squeegee holders 13, 14 are detachably mounted with a rubber squeegee 9, and an overflow squeegee 1 。. The blade carriers 5, 5 are further provided with a movable member 15 for preventing the rubber blade 9 from being lowered. The movable gear 1 5 moves up and down by means of a controllable motor 16 that is controllable. When the movable member 15 is referred to Fig. 4 showing the internal configuration, the screw is coupled to the screw 17. A pinion 18 is fixed to the upper end portion of the screw 17. The pinion 18 is engaged with the pinion 19. The pinion 19 is fixed to the upper portion of the rotary shaft 20. The lower end of the rotating shaft 20 is shown in Fig. 5, and the bevel gear 21 is fixed. The rotary shaft 23 of the bevel gear 22 that meshes with the bevel gear 21 is a rotational drive shaft that controls the motor 16. Therefore, by controlling the positive rotation drive or the reverse rotation drive of the motor 16, the screw 17 is rotated in the reverse direction to cause the movable member 15 to ascend or descend. As described above, the motion converting mechanism that converts the rotational motion of the control motor 16 into the lifting movement (reciprocating linear motion) of the movable member 15 is not limited to the mechanism of the example, and various other types such as a belt, a pinion, and a rack mechanism may be employed. The institutions are obvious to the industry. The control motor 16 can use a conventional control motor such as a servo motor or a stepping motor (pulse motor). In the present embodiment, in terms of advantages such as small size, low speed, dynamic torque, and braking performance at the time of power interruption, Use super: g: wave motor. The squeegee holder 13 is abutted against the movable member 15 when it is lowered in accordance with the driving of the cylinder 11, and as a result, the downward movement of the rubber squeegee 9 supported by the squeegee holder 13 is prevented, and the rubber squeegee is stopped. -8- 1331088 In the present embodiment, the movable member 15 defining the lower limit position of the squeegee holder 14 for supporting the overflow squeegee 10 is shown in Fig. 4, and is moved up and down by the rotation of the screw 26. However, the screw 26 is of a manual type and is operated by a knob 27 at the end. Of course, the overflow squeegee 1 is also the same as the rubber squeegee 9, and may be driven as a control motor, but the illustration is omitted. The first detecting means for detecting the position of the movable member 15 when the movable shutter 15 blocks the downward movement of the rubber blade 9 is provided. As shown in Figs. 2 and 3, the first detecting means includes a detecting portion 30 fixed to the movable member 15 and a detected portion 31 which is fixed to the detecting portion 30 of the squeegee holder 13 and can be detected. In the present embodiment, the detecting unit 30 may use another proximity sensor having a small reaction difference, such as a photoelectric switch, or a limit switch, although a proximity switch is used. The detected portion 31 is an inspection plate formed by bending a metal plate. As shown in Fig. 5, the inspection portion 31 is formed with a long hole 33 that is fixed to the fixing screws 32 and 32 for the squeegee holder 13, whereby fine adjustment of the mounting position of the detection portion 31 can be performed in the height direction. Further, a sensor such as a proximity switch or the like may be attached to the squeegee holder 13 to mount a detecting plate detected by the sensor at the movable member 15. As shown in Fig. 2, when the movable shutter 15 is separated from the bottom surface of the squeegee holder 13, the detected portion 31 is separated from the detecting portion 30, and the detecting portion 30 is in the OFF state. However, as shown in Fig. 6, the abutting When the movable member 15 and the squeegee carrier 5 block the lowering of the squeegee carrier 5, the detected portion 31 is positioned at the sensing position of the detecting portion 30, and the detecting portion 30 is turned ON. 1331088 A fixed gear 35 defining a lower limit of the movement of the movable member 15 is fixed to the squeegee carrier 5. The fixed gear 35 is used as the mechanical origin position of the movable member 15. In the present embodiment, the mechanical origin position of the movable member 15 is set at a position of 1 mm from the fixed stopper 35, that is, a position where the interval between the movable member 15 and the fixed member 35 is 1 mm. There is a second detection means for detecting the position of the machine origin. The second detecting means, as shown in Fig. 6, includes a detecting portion 36 fixed to the main body portion of the blade carrier 5, and a detected portion 37 fixed to the movable member 15 by the detecting portion 36. The detecting unit 36 uses a proximity switch in the illustrated example, but other conventional sensors may be used. The detected portion 37 is formed by an L-shaped metal plate. The holder 38 of the holding detecting portion 36 is formed with a long hole 40 through which the fixing bolt 39 is inserted. By the long hole 40, the bracket 38 is finely adjusted in the up and down direction. Referring to Fig. 3, the rotation angle detecting portion 42 which is rotated in synchronization with the rotation of the control motor 16 by the timing belt 41 is fixed in the squeegee carrier 5. The control motor 16 performs feedback control based on the encoder pulse signal sent from the corner detecting unit 42. Further, when the stepping motor is used as the control motor, since the rotation angle detecting portion is provided, it is not necessary to separately provide the rotation angle detecting portion. Next, the air pressure circuit for operating the cylinders 11 and 12 that move the rubber squeegee 9 and the overflow squeegee 10 up and down will be described below with reference to Fig. 7. Further, the left and right air pressure circuits in Fig. 7 are the same, and therefore the same reference numerals are given. In the pneumatic circuit of Fig. 7, the cylinders I and n are cylinders for moving the rubber squeegee 9 -10- 1331088 to move up and down, and the cylinders 12 and 12 are cylinders for lifting and lowering the squeegee 10 . The compressed air supplied from the compressor outside the figure is set at 66 MPa, and the pressure is sent to the air flow paths 50, 51 as the original pressure. The compressed air for moving the rubber squeegee 9 via the squeegee holder 13 is moved. The air flow paths 52 and 53 are supplied to the rising side chambers of the cylinders 1 1 and 11 through the manifold 54 and the air flow path 55. The air flow path 55 is provided with air supply and an electromagnetic switching valve 56 for ON/OFF. The compressed air for lowering the rubber blade 9 passes through the manifold 54 from the air flow paths 52 and 53 through one of the air flow paths 60 or 61, via the electromagnetic switching valve 62 that is switched to the air flow path 60 or 61, The air flow path 63 is supplied to the descending side chambers of the cylinders 1 1 and U. The air flow path 63 is separated by an electromagnetic switching valve 64 that is turned ON for pressure air supply. Further, the air flow path 60 is partitioned by a pressure reducing valve 65 for setting a micro pressure. The pressure reducing valve 65 depressurizes the secondary side pressure of the pressure reducing valve 65 to 0.04 MPa. The compressed air for moving the overflow squeegee 10 via the squeegee holders 14, 14 is supplied from the air flow paths 52, 53 to the rising side chamber of the cylinder through the air flow paths 66, 67. The air pressure for lowering the overflow squeegee 10 is supplied from the air flow paths 52 and 53 to the descending side chambers of the cylinders 12 and 12 through the air flow paths 66 and 68. Between the air flow path 66 and the air flow paths 67 and 68, an electromagnetic switching valve for switching the rise and fall of the overflow squeegee 10 is interposed. 69° In the seventh figure, all the electromagnetic switching valves are non-energized. The exciting state 'forces according to the springs provided in the respective electromagnetic switching valves toward the right -11 - 1331088 of Fig. 7. The rising side chambers of the cylinders 1 1 and 1 2 are provided with electromagnetic switching valves 5 6 and 67 to supply compressed air of 0.6 MPa. The descending side chambers of the cylinders 11, 12 are released from the air flow paths 63, 68 via the electromagnetic switching valves 64, 69, and the mufflers 6", 69a are released into the atmosphere. Therefore, the pneumatic circuit diagram of Fig. 7 is a rubber scraper. 9 and the state in which the overflow squeegee 10 is in the ascending position. As shown in Fig. 8, when the electromagnetic switching valves 56, 64, 69 are excited, the compressed air of the rising side chambers of the cylinders 11 and 12 passes through the electromagnetic switching valve. 56 and 69, the mufflers 56a and 69b are released into the atmosphere, and one of them is supplied with compressed air of 0.6 MPa from the air flow paths 52 and 53 through the air flow paths 66 and 61 to the lower chamber of the cylinders 11 and 12. The pneumatic circuit diagram of Fig. 8 shows a state in which the rubber blade 9 and the overflow blade 1 are placed at the lowered position. The pressure of 6 MPa is the pressure at the time of printing of the rubber blade 9. The pressure at the time of printing is based on the rubber. The type of the squeegee 9 and the like can be appropriately set, and it is preferably 0.25 to 0.6 MPa. When the pressure at the time of printing is applied, the front end portion of the rubber blade 9 is as shown in Fig. 6, and the endless belt 1 is pressed via the mold frame 6. Deflection state. Next, as shown in Figure 9, once the electromagnetic is made When the switching valve 62 is energized, the air flow path 6 1 is switched to the air flow path 60, and the compressed air decompressed to 0.04 MPa by the pressure reducing valve 65 is supplied to the lowering side chamber of the cylinder 11. Thereby, the rubber blade 1 1 According to the elasticity of the rubber blade 1 itself, the rubber blade 11 is lifted, and as shown in Fig. 11, the deflection is eliminated to form a state in which the screen on the endless belt 1 is contacted. The blade position in this state forms a rubber blade. The pressing origin of 9 is used to reduce the squeegee by a few mm, thereby adjusting the pressing amount of the squeegee. As described above, since the movable member 15 defines the lowering of the -12-1331088 rubber squeegee 9 At the lower limit position, the pressure origin position of the rubber blade 9 forms the pressure origin position of the movable member 15. Therefore, the air pressure supplied through the pressure reducing valve 65 is the pressure for confirming the pressure origin. The pressure for confirmation is such that the pressure at which the rubber blade 9 is deflected can be eliminated as described above, and the micro pressure greater than 0 can be set, for example, 0.02 to 0.1 MPa. The initial setting of the automatic screen printing machine having the above configuration will be described below. In addition, the overflow squeegee 10 is manually adjusted, thus saving In the above description, only the initial setting method of the rubber blade reference height position will be described. First, the machine origin position is initially set as follows. The fixing bolts 18a and 19a of the pinion gears 18 and 19 are loosened (see Fig. 4). The screw 19 is manually rotated in the clockwise direction to lower the movable member 15, as shown in Fig. 10, the gap between the fixed member 35 and the fixed member 35 is adjusted to 1 mm. At this time, by the detected portion 37 along In the long hole 40 (Fig. 6), the height position of the fine adjustment detecting portion 36 causes the detecting portion 36 to form "0". Further, although the mechanical origin position can be set at an appropriate position, it is generally set at the lower end position of the movable range of the movable member 15. Next, an initial setting for detecting the position of the pressing origin of the blade is performed. The electromagnetic switching valves 56, 64 are energized to cause the rubber blade 9 to descend. The pressure at this time is 66 MPa, and the front end of the rubber blade 9 is flexed by bending under pressure as shown in Fig. 10. Here, the electromagnetic switching valve is energized, and when the air pressure is switched to 0.04 MPa, the surface of the endless belt 1 is contacted by the elastic force of the rubber blade 9. Here, as shown in Fig. 1, the screw 17 is manually rotated in the counterclockwise direction so that the movable member 15 is raised to abut against the overflowing blade 13, and the movable member 15 abuts against the squeegee holder 13' The height position of the detected portion 31 is finely adjusted along the long hole 33 (Fig. 5 - 1331088) to cause the detecting portion 30 to be turned "ON". After the adjustment is completed, the fixing bolts 18a, 19a of the pinion gears 18, 19 are locked. The initial setting is performed without performing the normal operation before the test operation. Next, the operation during the normal operation after the initial setting is performed will be described. The main operation panel 8a having the input means ( When the squeegee setting switch of the touch panel of FIG. 1 is input to "ON", the control device 8 automatically performs the confirmation operation of the squeegee pressing origin position according to the flowchart of FIG. Before the squeegee setting switch is turned "ON", the squeegee pressing amount (height direction displacement amount) from the pressing origin position can be preset from the touch panel of the main operation panel 8a. The control device 8 includes a so-called PLC (Programable Logic Controller) 70, which is represented by a control program diagram of Fig. 14, and includes a calculation unit 71 for processing a control program, a memory control program, and a memory unit for inputting data (memory). 72: and input and output interfaces 73, 74, etc. The control device 8 further includes a position control position control unit 75 for controlling the motor 16. First, when the squeegee setting switch of the main operation panel 8a is "ON" (S1), the slave control unit 75 transmits the control motor 16 clockwise to the control unit 75. In the direction (CW) rotation command, the control unit 75 transmits a predetermined pulse signal to the control motor to rotate the control motor 16 to the predetermined rotational speed in the clockwise direction to control the motor 16 (S 2 ). When the motor 16 is rotated in the clockwise direction, the movable member 15 is moved down by -14 - 1331088. When the detection unit 36 of the second detecting means reaches the position of the machine origin, "ON" is formed (S3), and the PLC 70 that receives the detection signal transmits a stop signal of the control motor 16 to the position control unit 75, and stops the position control. The pulse signal of the unit 75 stops the downward movement of the movable member 15 (S4). The "quot" signal of the detecting unit 36 of the second detecting means is received, and the electromagnetic switching valves 値56, 64, 69 are energized (S5). The rubber blade 9 is moved downward, and the rubber blade 9 is pressed against the endless belt 1 via the screen at a gas pressure of 0.6 MPa. At this time, the front end of the rubber blade 9 is in a state of being bent and bent (refer to the first 〇) Then, the electromagnetic switching valve 62 is energized (S6), and the air pressure of the rubber blade 9 is switched to 0.04 MPa, and the state of the rubber blade 9 is bent and flexed by the elastic force of the rubber blade 9. Contacting the screen on the endless belt 1 with the undeflected state causes the rubber blade 9 to form a pressurizing origin position. Next, the control motor 16 is rotated in the counterclockwise direction (CCW) to raise the movable member 15 (S7). Detection of the first detection means When the PLC 70 receives the "ON" signal (S8), the control motor 16 is stopped (S9) from the PLC 70 via the position control unit 75. The stop position forms a pressurization origin position. The encoder pulse from the corner detecting portion 42 is The number of pulses is calculated by the position control unit 75 and sent to the PLC 70 (internal pulse counter). The number of calculations of the encoder pulse is stored in the memory unit 72. When the pressure origin position is reached, the code from the rotation angle detecting portion 42 is calculated. Pulse of the pulse - 1531018 The counter is reset to "0" (S10). Before the squeegee setting switch is set to "ON", the setting 値 (S11) in the range of, for example, 1.0 to 9.9 mm, which is the squeegee pressure data (height direction amount), is input in advance via the touch panel of the main operation panel, and the timing is set. After the set time (S12), the motor 16 is controlled to rotate toward the clockwise (CW) direction (S13), and the movable member 15 is lowered. In response to the falling of the active gear member 15, the φ pulsator pulse from the corner detecting portion 42 is transmitted to the PLC 70 via the position control unit 75, and the number of coded pulses is calculated. The calculation unit 71 converts the calculated encoder pulse number into the moving distance of the movable member 15, and when the falling amount (height displacement amount) of the movable member 15 reaches the setting (S 14 ), the control motor 16 6 S is stopped. 1 5), stop the active gear 1 5 . Further, the position control unit 75 receives the encoder pulse from the rotation angle detecting portion 42 and performs the feed control of the control motor 16 whereby the movable member 15 is lowered by the distance of the set jaw so that the movable member 15 is set at the input. The scheduled position after the stop stops. # After the active gear member 15 is stopped, the electromagnetic switching valves 56 and 64 are demagnetized (S16), and the electromagnetic switching valve 62 is demagnetized (S17), and the scraper 11 is raised to the raised position. As apparent from the above description, in order to set the pressure origin position, the pressure of the cylinder for raising and lowering the squeegee is switched to the pressure for printing and the pressure for confirming the pressure point, so that the conventional detection does not occur. The above problem at the time of setting the current can adjust the blade pressure with good reproducibility. 8a Transmitter square encoder live direction (reverse 69 plate over-force -16- 1331088 [Simplified illustration] Stomach 1m is a printing of an automatic screen printing machine with the squeegee pressure regulating device according to the present invention Top view of the unit The stomach 2 is a front view showing the squeegee carrier of the main part of Fig. 1. Fig. 3 is a plan view showing a part of the squeegee of the squeegee carrier of Fig. 2. The front view of the internal structure of the squeegee carrier of Fig. 2. Fig. 5 is a side view showing the internal structure of the squeegee carrier of Fig. 2. Fig. 6 is a view showing another operation state of the squeegee carrier of Fig. 2 Fig. 7 is a pneumatic circuit diagram of a cylinder for driving the squeegee carrier of Fig. 2, Fig. 8 is a view showing another operation state of the pneumatic circuit of Fig. 7. Fig. 9 is a view showing a pneumatic circuit of Fig. 7. Fig. 11 is a front view showing another operational state of the squeegee carrier of Fig. 2. Fig. 11 is a front view showing another operation state of the squeegee carrier of Fig. 2. The figure shows other actions of the squeegee carrier of Fig. 2 Fig. 13 is a flow chart showing the control flow of the squeegee pressure adjusting device according to the present invention. Fig. 14 is a view showing the -17-1331088 control of the squeegee pressure adjusting device according to the present invention. Main block diagram. Component symbol description] Endless belt printing unit machine guide frame: timing belt ~4e: timing pulley scraper carrier mold rubber scraper = overflow scraper,: 1 2: cylinder, 14: scraper bracket: Active gear: Control motor: screw '1 9 : pinion: shaft, 2 2 : bevel gear: shaft = screw: knob -18- 1331088 : detection part: detected part: fixed part: detection part: detected Department = bracket: fixing bolt: long hole = timing belt: corner detection part, 5 1 : air flow path, 5 3 : air flow path: manifold: air flow path: electromagnetic switching valve, 61: air flow path: electromagnetic Type switching valve: air flow path: electromagnetic switching valve a: silencer: pressure reducing valve ~ 6 8 : air flow path: electromagnetic switching valve a = silencer-19-