1295700 玖、發明說明 【發明所屬之技術領域】 本發明係有關一種縫紉機送布裝置。 【先前技術】 專利DE 22 23 202 C2曾提出一種具一送布裝置之縫紉 機，其送布件在縫紉機工作時始終與織物接觸。該送布件 設作所謂的送布輪，其在每一針腳產生週期中進行兩個連 續的饋送動作。 此送布裝置（參閱DE 22 23 202 C2之圖5)具兩夾桿，其 爲角形並可各繞一軸栓擺動。該夾桿各與被一支架承載之 夾爪互相作用並驅動一齒形皮帶，該齒形皮帶環繞兩齒 輪。該齒輪以傳動件而與兩旋轉送布件直接驅動連接。 第一夾桿及所屬第一夾爪作用於齒形皮帶第一段，第二 夾桿及所屬第二夾爪則作用於齒形皮帶第二段。 第一夾桿及第一夾爪構成一第一驅動件，第二夾桿及第 二夾爪構成一第二驅動件，齒形皮帶則構成一從動件。 兩夾爪作用於齒形皮帶的齒側，兩夾桿則作用於其外 側’其藉一作用於夾桿的彈簧而達到力嚙合連接。 此送布裝置兩驅動件的驅動係利用一具偏心輪的軸、一 導桿及一在滑槽上滑動的滑塊。藉調整滑槽之傾斜位置可 改變滑塊的有效運動量及饋送步伐的大小。 這些構件構成一推送傳動裝置，其可被縫紉機主軸或一 與該主軸驅動連接的軸驅動。 如此構成之推送傳動裝置作用在於使兩驅動件在針腳 6 326\專利說明書(補件)\92_〇5\92103392 1295700 產生週期時上升然後再下降，其上升量由滑槽的傾斜位置 決定。第一驅動件在向上運動時與齒形皮帶第一段力嚙 合，第二驅動件則脫離而與齒形皮帶第二段無驅動連接。 第一驅動件接著向下運動時脫離齒形皮帶第一段’第二 驅動件則與齒形皮帶第二段力嚙合。 爲使兩驅動件與皮帶各段嚙合及鬆脫，縫紉機一軸上（可 是主軸或另一與主軸連接之軸）設另一偏心輪，該偏心輪經 一導桿作用於承載夾爪之支架的上端，而可使該支架繞一 軸栓擺動，該軸栓則樞接一固定在外殼上的搖臂。 被軸驅動的偏心輪與導桿及支架一同構成一與縫紉機 驅動裝置旋轉驅動連接的轉換傳動裝置。 藉該轉換傳動裝置可決定第一驅動件與齒形皮帶嚙合 的時刻與持續時間，其中藉兩夾桿之傳動連接而使得第一 驅動件與齒形皮帶第一段嚙合時，第二驅動件脫離齒形皮 帶第二段，故齒形皮帶第二段可自由通過第二驅動件之夾 桿與夾爪之間。 第一驅動件所產生的（第一）饋送步伐結束而脫離齒形皮 帶第一段時，第二驅動件與齒形皮帶嚙合。故第二驅動件 所產生的（第二）饋送步伐雖然與第一驅動件所產生的（第 一）饋送步伐反向，但卻使齒形皮帶同向運動，故亦使兩皮 帶輪以同向旋轉。 此處之缺點在於，齒形皮帶的驅動會產生不確定的傳動 關係。 故可能發生的是，在一極短暫時間內第一驅動件與第二 7 326\專利說明書(補件)\92-05\92103392 1295700 驅動件皆脫離齒形皮帶，使得送布裝置的送布件沒有運動 控制。亦可能發生相反情形，即在一極短暫時間內第一驅 動件與第二驅動件皆與齒形皮帶嚙合，使得齒形皮帶的磨 損提高。 兩者可能妨礙織物的饋送運動並導致齒形皮帶提早磨 專利DE 198 12 9 1 3 C2提出另一送布裝置，其送布件同 樣始終與織物接觸。 該送布裝置一如專利DE 22 23 202 C2具有一推送傳動裝 置，但此處專利DE 22 23 202 C2送布裝置所使用的習知滑 槽針腳調節器被所謂的活節針腳調節器取代，該活節針腳 調節器之作用方式同樣爲習知。 · 兩驅動件設作一離合器之構件，與從動件一起對中於同 一中心軸。’推送傳動裝置使兩驅動件繞該中心軸進行旋轉 運動。 此處驅動件及從動件可在中心軸方向上移動，在第一次 提升運動時，第一驅動件的摩擦面與從動面的摩擦面嚙 合’在第二次提升運動時，第二驅動件的摩擦面與從動面 的摩擦面嚙合。第一驅動件與從動面嚙合時，第二驅動件 脫離從動件，第二驅動件與從動面嚙合時·，第一驅動件脫 離從動件。爲確保第一及第二驅動件與從動件間的驅動連 接’設一與驅動件及從動件中心軸同軸可軸向移動的中空 軸，其軸向位置由一轉換傳動裝置控制。中空軸一凸緣上 所設置之帶動件輪流與第一及第二驅動件嚙合，而使從動 326\專利說明書(補件)\92-〇5\92103392 8 1295700 件產生一同向的脈動式旋轉運動。 由於從動件的驅動由第一交換爲第二驅動件或由第二 交換爲第一驅動件始終在驅動件兩運動返轉之瞬間進行， 其速度因此在此瞬間幾乎爲零，故在此瞬間兩驅動件雖然 可與從動件驅動連接，但推送及轉換傳動裝置之運動行程 彼此需要極精密的設定。 【發明內容】 本發明之目的在於提供一種設置有縫紉機工作時始終 與織物接觸之送布件的縫紉機送布裝置，其第一與第二驅 動件的交換即使未能精準地在兩驅動件運動返轉的瞬間中 進行，從動件驅動時交換的傳動關係仍足夠確定。亦即應 確保欲脫離的驅動件在從動件與欲嚙合之驅動件達到驅動 連接之前仍保持與從動件嚙合。 本目的由申請專利範圍第1項之特徵部分達成。本發明 之建議爲，使欲脫離之驅動件克服一彈簧力而脫離。其先 決條件爲，使欲與從動件嚙合之驅動件在欲脫離之驅動件 剛開始要脫離從動件時便抵靠從動件。故驅動件互相交 替。一驅動件與另一驅動件連續互相交換。一驅動件在下 一驅動件與從動件達到面接觸或形狀嚙合時才脫離從動 件。力或抵靠交換在轉換傳動裝置所產生驅動件的交換與 彈簧彈性的配合下瞬間進行。驅動件交換絕對無間隔，亦 即施予從動件的力或傳輸扭力在時間上無中斷。 壓緊件與其支桿的相對運動在設計上係利用將壓緊件 設在一蹺板上，並使該蹺板與壓緊件所屬支桿擺動連接。 326\專利說明書(補件)\92-05\92103392 1295700 對兩支桿活動連接有利的是，使壓緊件設在蹺板一端 上，蹺板另一端則設一連接桿，並使其樞接另一支桿。 壓緊件與驅動件間的施力點在一穿過從動件中心的直 線上時，可達到有利的施力關係。 壓緊件由滾輪構成時，可達到有利的摩擦關係。 使轉換傳動裝置只需少數個構件的設計手段爲將其設 作一四活節傳動裝置，其偏心輪與主軸驅動連接，其搖臂 由支桿構成，其中四活節傳動裝置支桿與蹺板的活節連接 及支桿與連接桿的活節連接之中心軸彼此平行。 縫紉機設有針輸送裝置時，如針桿之擺動框與推送傳動 裝置連接，則其饋送運動可簡單地與送布件之運動配合。 如此針的饋送運動與送布件的饋送運動可被同一調整件調 整。 以下將依據附圖所示實施例詳細說明本發明其他優點 及細節。 【實施方式】 圖1顯示一縫紉機1，其具一懸臂2、一支柱3及一基台 4。基台4上可固定一未圖示出的床台。 懸臂2內容置一以未圖示出之軸承支撐之臂軸5，其末 端設一曲柄6，該曲柄連接承載一針7之針桿8。針7與一 設在機台4內部或機台上之床台內部的梭子互相作用，該 梭子經一傳動裝置9及一軸1 1而被臂軸5驅動。 針桿8可移動地設在一框架12上，該框架12可擺動地 固定在懸臂2中並經一曲柄1 3與固定在懸臂2中的搖桿 10 326\專利說明書(補件)\92-05\92103392 1295700 1 4連接。針桿8除如稍後所述上下移動外並可平行於織物 饋送方向而擺動。 懸臂2中平行於搖桿14設有另一軸1 5，其經一傳動裝 置16(上傘齒輪組、立軸、下傘齒輪組）而與一旋轉的上送 布件1 7連接。該上送布件1 7被一固定在懸臂2上的支架 1 8支撐並進行脈動式旋轉運動。 基台4內部或機台上之床台內部設有一與上送布件17 互相作用且同樣旋轉的下送布件19,該下送布件與上送布 件1 7同樣進行脈動式旋轉運動且與一軸2 1驅動連接，該 軸平行於臂軸5且由下送布件延伸至接近支柱3。 臂軸5上設一偏心輪22(圖3)，該偏心輪與一偏心桿23 互相作用，偏心桿以一軸栓24樞接一導桿25。導桿25並 以軸栓24而與一習知之活節針腳調節器27之框架26樞 接。導桿25以一軸栓28樞接一曲柄31之臂29，該曲柄 設置在一軸3 2上。偏心輪22及其連接之構件構成一推送 傳動裝置3 3，該推送傳動裝置使得以軸栓3 5而與曲柄3 1 第二臂34連接的兩拉桿36，37進行一上下擺動運動。兩 上下擺動之拉桿36，37穿過支柱而向下延伸至機台4部 分。拉桿36以一軸栓38樞接一搖臂39，拉桿37則以一 軸栓41樞接一搖臂42。兩搖臂39，42可繞一構成擺動軸 的軸21擺動，而相應於拉桿36，37的上下擺動運動繞軸 21擺動。軸21固定於基台4上，其不朝向支柱3的一端 與下送布件1 9驅動連接。 使拉桿36與搖臂39樞接的軸栓38與一摩擦塊44未圖 11 326\專利說明書(補件)\92·05\92103392 1295700 示出的臂連接，該摩擦塊設有摩擦皮的內側可抵靠一輪轂 45，輪轂被軸21支撐並與軸固定連接。使拉桿37與搖臂 42樞接的軸栓41與一摩擦塊46未圖示出的臂連接，該摩 擦塊4 4設有摩擦皮的內側可抵靠輪轂4 5的另一側。 拉桿36向上運動時，摩擦塊44以其配合輪轂45周面直 徑的內面抵靠輪轂45並使得圖2及3所示的輪轂45進行 一順時針旋轉運動，軸2 1於是被帶動旋轉。摩擦塊44因 此構成一第一驅動件47。此時摩擦塊46不抵靠構成從動 件49之輪轂45周面。 拉桿37向下運動時，摩擦塊46以其配合輪轂45周面直 徑的內面抵靠輪轂45並使得圖2及3所示的輪轂45同樣 進行一順時針旋轉運動，軸2 1於是同樣被帶動旋轉。摩擦 塊46因此構成輪轂45 (從動件49)的第二驅動件48(從動件 49)。此時與拉桿36 —*起向下移動的摩擦塊44不抵靠輪轂 45周面。 爲使第一驅動件47與從動件49及第二驅動件48與從動 件49之間達到一摩擦連接，第一驅動件47設有一第一壓 緊件51，第二驅動件48則設有一第二壓緊件52。兩壓緊 件51，52優先設作滾輪。 爲支撐兩壓緊件51，52而設有一支架53,該支架容置於 基台4。支架5 3左端設有一軸栓5 4而樞接一支桿5 5。此 處軸栓54偏心設置於支架53，以可調整支桿55所支撐摩 擦塊44與從動件49的相對位置。支桿55約中心處設有一 未圖示出的軸栓，第一壓緊件5 1 (滾輪）可自由旋轉地固定 12 326\專利說明書(補件)\92-〇5\92103392 1295700 在該軸栓上並抵靠摩擦塊44背側。 支架53垂直向上的部分56設有另一軸栓57樞接一第二 支桿58，其上端設有另一軸栓59。圖4所示軸栓59右端 設有一蹺板6 1，該蹺板上端設有一未圖示出的軸栓’第二 壓緊件 52可自由旋轉地固定在該軸栓上並抵靠摩擦塊 4 6 (第二驅動件4 8 )背側。故蹺板6 1以軸栓5 9而與拉桿7 2 樞接。 曉板6 1上端固定有一銷6 2，其被彈簧6 3 —端夠住，彈 簧另一端則掛在支桿55自由端的另一銷64上。彈簧63 係用於使兩摩擦塊44，46(驅動件47，48)抵靠輪轂45 (從動 件 4 9) 〇 以軸栓5 9支撐之蹺板6 1下端設有一軸栓6 5而樞接一連 接桿6 6 —端，其另一端則以支桿5 5之軸栓6 7樞接該支 桿。兩支柱5 5，5 8因此彼此活動連接。 爲使摩擦塊44，46與從動件49摩擦連接及分離而設有 —轉換傳動裝置6 8，其具一設在軸6 9上的偏心輪7 1。軸 69固定在外殼上並與臂軸5驅動連接，亦即其以1 :1之比 例被臂軸驅動。偏心輪7 1與拉桿7 2互相作用，拉桿自由 端以支桿5 8之軸栓5 9而與支桿樞接，使得支桿5 8及以連 接桿66連接的支桿55可分別繞旋轉點57, 54擺動。 基本上設作四活節轉換傳動裝置的轉換傳動裝置 6 8使 兩支桿55，58在臂軸5或軸69每轉一圈時可進行一次往 復運動。該往復運動使得兩摩擦塊44，46(驅動件47，48) 交替抵靠輪轂4 5 (從動件4 9 )，輪轂於是與軸2 1 —起進行 13 326\專利說明書(補件)\92-05\92103392 1295700 -由兩個動作構成的脈動式旋轉運動。 由於彈簧63使兩摩擦塊44, 46與輪轂45保持抵靠而確 保摩擦塊與輪轂45的摩擦連接，故脫離摩擦連接只需克服 彈簧63之力。摩擦塊44, 46藉克服彈簧力而脫離輪轂45， 其先決條件是另一摩擦塊46, 44抵靠輪轂45。 摩擦塊44, 46交替抵靠，一摩擦塊與另一摩擦塊連續互 相交換。一抵靠摩擦塊在另一摩擦塊與輪轂45形狀嚙合時 才被釋放。由於支柱5 5，5 8藉助彈簧力之壓緊運動的互相 配合，摩擦塊瞬間交替抵靠輪轂，而使交替無間隔，亦即 力的交換無時間中斷。如此使得輪轂45在交換抵靠時始終 被控制’兩摩擦塊短暫抵靠輪轂。由於調整摩擦塊44，46 之抵靠及轉換傳動裝置68時，交換抵靠在摩擦塊44，46 返轉之瞬間進行，且摩擦塊在該瞬間的速度等於零，故在 該瞬間時兩摩擦塊（兩壓緊件51，52)皆與輪轂45 (從動件49) 摩擦連接。兩摩擦塊44，46對輪轂45的同時瞬間抵靠係 藉支桿5 8與第二壓緊件5 2間之相對運動而達成。 圖2顯示兩摩擦塊4 4，4 6在交換抵靠時的狀態，其中拉 桿72所造成的支桿58擺動運動經連接桿66而帶動支桿 55，使得欲抵靠輪轂45的摩擦塊44靠近輪轂45而抵靠 之。在此支桿58運動時，蹺板61繞軸栓59擺動而對支桿 5 8產生一相對運動，使得欲鬆脫的摩擦塊4 6仍被第二壓 緊件52壓向輪轂45。輪轂45之該瞬間位置被兩摩擦塊44, 46固定。 隨後蹺板61與支桿58 —起繞固定在外殼上的軸栓57 14 326\專利說明書(補件)\92·05\92103392 1295700 擺動’故第二壓緊件52克服彈簧63之力而離開摩擦塊 46 ’摩擦塊於是與輪轂45脫離摩擦連接。 輪轂45 (從動件49)因此進行一脈動式旋轉運動。在推送 傳動裝置33的第一個提升運動時，第一驅動件47抵靠從 動件49周面，在推送傳動裝置33與第一提升運動方向相 反的第二提升運動時，第二驅動件4 8抵靠從動件4 9周面， 兩驅動件47, 4 8的交換抵靠則被轉換傳動裝置68控制。 如此軸2 1在每個針腳產生週期中各進行兩次同向的連 續旋轉運動，其構成一次脈動式旋轉運動。由於軸2 1與下 送布件19驅動連接，故脈動式旋轉運動直接帶動該下送布 件。 爲使脈動式旋轉運動同時亦帶動上送布件的輒1 5，輪軸 21上設一齒形皮帶輪73，其以一齒形皮帶74及另一皮帶 輪7 5而與軸1 5驅動連接。 由於活節針腳調節器27可調整拉桿36，37的運動量亦 可調整其運動方向，故可操作活節針腳調節器27而同時調 整或改變兩送布件1 7, 1 9的饋送運動方向及/或饋送運動 量。 爲使設有針輸送裝置的縫紉機在操作活節針腳調節器 27時亦可同時一起調整針7的饋送運動，故設置在軸32 上的曲柄31 (圖3)具有另一臂76，其經一導桿77及搖桿 14之適當連接件78而使針輸送裝置在運動量及運動方向 上配合送布件1 7，1 9而進行擺動運動。 【圖式簡單說明】 15 326\專利說明書(補件)\92·05\92103392 1295700 圖1係一縫紉機前視圖。 圖2係本發明原理之示意圖。 圖3係縫紉機之本發明部分。 圖4係圖3線111-111之截面圖。 圖5係圖3線IV-IV之截面圖。 (元件編號說明） 1 縫紉機 2 懸臂 3 支柱 4 基台 5 臂軸 6 曲柄 7 針 8 針桿 9 傳動裝置 11 軸 12 框架 13 曲柄 14 搖桿 15 軸 1 6 傳動裝置 17 上送布件 18 支架 19 下送布件 16 326\專利說明書(補件)\92-05\92103392 1295700 21 輪軸 2 2 偏心輪 23 偏心桿 2 4 軸栓 25 導桿 26 框架 27 活節針腳調節器 28 軸栓 29 臂 3 1 曲柄 32 軸 33 推送傳動裝置 34 第二臂 35 軸栓 36 拉桿 37 拉桿 38 軸栓 39 搖臂 41 軸栓 42 搖臂 44 摩擦塊 45 輪轂 46 摩擦塊 47 第一驅動件 171295700 发明, INSTRUCTION DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a sewing machine feed device. [Prior Art] A sewing machine having a feed device has been proposed in the patent DE 22 23 202 C2, the feed member of which is always in contact with the fabric during operation of the sewing machine. The feed member is provided as a so-called feed roller which performs two consecutive feeding operations in each stitch generation cycle. This feed device (see Figure 5 of DE 22 23 202 C2) has two clamping bars which are angular and can be pivoted about a pivot pin. The clamp bars each interact with a jaw carried by a carriage and drive a toothed belt that surrounds the two gears. The gear is directly drivenly coupled to the two rotating feed members by a transmission member. The first clamping rod and the associated first jaw act on the first section of the toothed belt, and the second clamping rod and the associated second jaw act on the second section of the toothed belt. The first clamping bar and the first clamping jaw form a first driving member, and the second clamping bar and the second clamping jaw constitute a second driving member, and the toothed belt constitutes a driven member. The two jaws act on the flank of the toothed belt, and the two clamping rods act on the outer side of the jaws to achieve a force-fitting connection by a spring acting on the clamping rod. The driving mechanism of the two driving members of the feeding device utilizes a shaft of an eccentric wheel, a guide rod and a slider sliding on the sliding groove. By adjusting the tilt position of the chute, the effective amount of movement of the slider and the size of the feeding step can be changed. These components form a push transmission that can be driven by the sewing machine spindle or a shaft that is drivingly coupled to the spindle. The push transmission thus constructed functions to raise and then lower the two drive members during the cycle of stitch 6 326 \ patent specification (supplement) \92_〇5\92103392 1295700, the amount of which is determined by the tilt position of the chute. The first drive member engages the first segment of the toothed belt during upward movement and the second drive member disengages from the second segment of the toothed belt without drive connection. The first drive member then disengages from the first section of the toothed belt as it moves downwards. The second drive member then engages the second section of the toothed belt. In order to engage and release the two driving members and the belt segments, another eccentric wheel is disposed on one shaft of the sewing machine (either the main shaft or another shaft connected to the main shaft), and the eccentric wheel acts on the bracket of the carrying jaw via a guiding rod. The upper end allows the bracket to swing about a shaft bolt, and the shaft bolt is pivotally connected to a rocker arm fixed to the outer casing. The eccentric wheel driven by the shaft, together with the guide rod and the bracket, constitutes a shifting transmission that is rotationally coupled to the sewing machine drive. The timing and duration of engagement of the first driving member with the toothed belt can be determined by the conversion transmission, wherein the second driving member is engaged with the first driving portion of the toothed belt by the driving connection of the two clamping rods The second section of the toothed belt is detached from the second section of the toothed belt, so that the second section of the toothed belt is freely passed between the clamping rod of the second driving member and the jaw. The second drive member engages the toothed belt when the (first) feed step produced by the first drive member ends and exits the first segment of the toothed belt. Therefore, the (second) feeding step generated by the second driving member is opposite to the (first) feeding step generated by the first driving member, but the toothed belt is moved in the same direction, so that the two pulleys are also in the same direction. Rotate. The disadvantage here is that the drive of the toothed belt creates an indeterminate transmission relationship. Therefore, it may happen that the first driving member and the second 7 326\patent specification (supplement)\92-05\92103392 1295700 driving members are separated from the toothed belt in a short period of time, so that the feeding device feeds the cloth. There is no motion control. It may also be the case that the first drive member and the second drive member both mesh with the toothed belt in a short period of time, so that the wear of the toothed belt is increased. Both may impede the feeding movement of the fabric and cause the toothed belt to be prematurely ground. Patent DE 198 12 9 1 3 C2 proposes another feed device, the feed member of which is also always in contact with the fabric. The feed device has a push transmission as in the patent DE 22 23 202 C2, but the conventional chute pin adjuster used in the DE 22 23 202 C2 feed device is replaced by a so-called joint pin adjuster. The mode of action of the joint stitch adjuster is also conventional. • The two drive members are designed as a clutch member that is centered on the same central shaft with the follower. The push transmission causes the two drive members to rotate about the central axis. Here, the driving member and the driven member are movable in the direction of the central axis. During the first lifting movement, the friction surface of the first driving member meshes with the friction surface of the driven surface. In the second lifting movement, the second The friction surface of the driving member meshes with the friction surface of the driven surface. When the first driving member is engaged with the driven surface, the second driving member is disengaged from the driven member, and when the second driving member is engaged with the driven surface, the first driving member is separated from the driven member. To ensure a drive connection between the first and second drive members and the follower, a hollow shaft axially movable coaxially with the drive member and the follower central axis is provided, the axial position of which is controlled by a shifting transmission. The driving member provided on the flange of the hollow shaft is alternately engaged with the first and second driving members, so that the driven 326\patent specification (supplement)\92-〇5\92103392 8 1295700 pieces generate a pulsating direction in the same direction. Rotating motion. Since the driving of the follower is performed by the first switching to the second driving member or the second switching to the first driving member is always performed at the moment when the driving member moves back, the speed is therefore almost zero at this moment, so here Although the two drive members can be driven to be driven by the follower, the movement strokes of the push and return transmissions need to be extremely precise. SUMMARY OF THE INVENTION It is an object of the present invention to provide a sewing machine feed device provided with a feed member that is always in contact with a fabric during operation of the sewing machine, wherein the exchange of the first and second drive members does not accurately move the two drive members. During the moment of reversal, the transmission relationship exchanged while the follower is driven is still sufficiently determined. That is, it should be ensured that the drive member to be disengaged remains engaged with the follower before the follower member and the drive member to be engaged reach the drive connection. This object is achieved by the characterizing part of item 1 of the scope of the patent application. The proposal of the present invention is to disengage the drive member to be disengaged against a spring force. The precondition is that the driving member that is to be engaged with the driven member abuts against the driven member when the driving member to be disengaged is initially separated from the driven member. Therefore, the drive members alternate with each other. One drive member and the other drive member are continuously exchanged with each other. A drive member is disengaged from the follower when the next drive member comes into surface contact or form engagement with the follower member. The force or the abutment exchange is instantaneously performed in cooperation with the exchange of the drive member produced by the shifting transmission with the spring elasticity. The drive member exchange is absolutely free of spacing, i.e., the force applied to the follower or the transmitted torque is uninterrupted in time. The relative movement of the pressing member and its struts is designed to provide a pressing member on a slab and to oscillate the yoke with the struts to which the pressing member belongs. 326\patent specification (supplement)\92-05\92103392 1295700 It is advantageous for the two rods to be connected in a movable manner on one end of the jaws, and at the other end of the jaws a connecting rod is provided and pivoted Take another pole. An advantageous force-applying relationship can be achieved when the point of application between the pressing member and the driving member is on a straight line passing through the center of the driven member. When the pressing member is formed by the roller, an advantageous friction relationship can be achieved. The conversion transmission device only needs a few components to design it as a four-joint transmission device, the eccentric wheel is drivingly connected with the main shaft, and the rocker arm is composed of a strut, wherein the four-joint transmission support rod and the cymbal The joint of the joint of the plate and the central axis of the joint of the strut and the connecting rod are parallel to each other. When the sewing machine is provided with a needle conveying device, such as the swinging frame of the needle bar being connected to the pushing transmission device, the feeding movement can be simply coordinated with the movement of the feeding member. The feeding movement of the needle and the feeding movement of the feed member can be adjusted by the same adjustment member. Further advantages and details of the present invention will be described in detail below with reference to the embodiments shown in the drawings. [Embodiment] FIG. 1 shows a sewing machine 1 having a cantilever 2, a strut 3, and a base 4. A bed (not shown) can be fixed to the base 4. The cantilever 2 is placed with an arm shaft 5 supported by a bearing (not shown), and a crank 6 is provided at the end thereof, and the crank is connected to a needle bar 8 carrying a needle 7. The needle 7 interacts with a shuttle provided inside the machine bed 4 or on the bed of the machine table, and the shuttle is driven by the arm shaft 5 via a transmission 9 and a shaft 11. The needle bar 8 is movably disposed on a frame 12 which is swingably fixed in the cantilever 2 and passes through a crank 13 and a rocker 10 326 fixed in the cantilever 2\patent specification (supplement)\92 -05\92103392 1295700 1 4 Connect. The needle bar 8 is oscillated in parallel with the fabric feeding direction except for moving up and down as will be described later. Parallel to the rocker 14 is provided with another shaft 15 which is coupled to a rotating upper feed member 17 via a transmission device 16 (upper bevel gear set, vertical shaft, lower bevel gear set). The upper feed member 17 is supported by a bracket 18 fixed to the boom 2 and subjected to a pulsating rotary motion. The bottom of the base 4 or the bed on the machine table is provided with a lower feed member 19 which interacts with the upper feed member 17 and rotates in the same manner, and the lower feed member performs the same pulsating rotary motion as the upper feed member 17. And is coupled to a shaft 21 that is parallel to the arm shaft 5 and extends from the lower feed member to the struts 3. The arm shaft 5 is provided with an eccentric wheel 22 (Fig. 3). The eccentric wheel interacts with an eccentric rod 23, and the eccentric rod is pivotally connected to a guide rod 25 by a shaft bolt 24. The guide rod 25 is pivotally coupled to the frame 26 of a conventional joint stitch adjuster 27 by a shaft pin 24. The guide rod 25 is pivotally connected to the arm 29 of the crank 31 by a shaft bolt 28 which is disposed on a shaft 3 2 . The eccentric 22 and its associated members form a push transmission 3 3 which performs a vertical oscillating movement of the two tie rods 36, 37 which are connected to the second arm 34 of the crank 3 1 by the shaft pin 35. Two up and down swinging levers 36, 37 extend through the struts and extend down to the machine section 4. The pull rod 36 is pivotally connected to the rocker arm 39 by a shaft bolt 38. The pull rod 37 is pivotally connected to the rocker arm 42 by a shaft bolt 41. The two rocker arms 39, 42 are pivotable about a shaft 21 constituting the swing shaft, and the up and down swing motion corresponding to the pull rods 36, 37 is swung around the shaft 21. The shaft 21 is fixed to the base 4 and is not drivingly coupled to the lower feed member 19 toward one end of the strut 3. The shaft pin 38 pivotally connecting the pull rod 36 to the rocker arm 39 is connected to a friction block 44 which is not shown in the figure shown in FIG. 11 326\patent specification (supplement)\92·05\92103392 1295700, and the friction block is provided with friction skin. The inner side can abut against a hub 45 which is supported by the shaft 21 and fixedly coupled to the shaft. The shaft pin 41 pivotally connecting the lever 37 to the rocker arm 42 is coupled to an arm (not shown) of a friction block 46 which is provided with the inner side of the friction skin abutting against the other side of the hub 45. When the pull rod 36 is moved upward, the friction block 44 abuts against the hub 45 with its inner surface having the diameter of the circumferential surface of the hub 45 and causes the hub 45 shown in Figs. 2 and 3 to perform a clockwise rotational movement, and the shaft 21 is then rotated. The friction block 44 thus constitutes a first drive member 47. At this time, the friction block 46 does not abut against the circumferential surface of the hub 45 constituting the follower 49. When the tie rod 37 moves downward, the friction block 46 abuts against the hub 45 with its inner surface of the circumferential diameter of the hub 45 and causes the hub 45 shown in FIGS. 2 and 3 to also perform a clockwise rotational movement, and the shaft 21 is thus also Drive the rotation. The friction block 46 thus constitutes the second drive member 48 (the follower 49) of the hub 45 (the follower 49). At this time, the friction block 44 that moves downward with the tie rod 36 does not abut against the circumferential surface of the hub 45. In order to achieve a frictional connection between the first driving member 47 and the follower 49 and the second driving member 48 and the follower 49, the first driving member 47 is provided with a first pressing member 51, and the second driving member 48 is provided. A second pressing member 52 is provided. The two pressing members 51, 52 are preferably provided as rollers. To support the two pressing members 51, 52, a bracket 53 is provided, which is received in the base 4. The left end of the bracket 5 3 is provided with a shaft bolt 5 4 and pivotally connected to a rod 5 5 . The shaft pin 54 is eccentrically disposed on the bracket 53 to adjust the relative position of the friction block 44 and the follower 49 supported by the strut 55. A pivot pin (not shown) is disposed at a center of the strut 55, and the first pressing member 5 1 (roller) is rotatably fixed 12 326\patent specification (supplement)\92-〇5\92103392 1295700 The shaft is bolted against the back side of the friction block 44. The vertically upward portion 56 of the bracket 53 is provided with another axle pin 57 pivotally connected to a second pole 58 and the other end is provided with another axle pin 59. The right end of the shaft pin 59 shown in Fig. 4 is provided with a sill plate 6 1. The stern plate end is provided with a shaft bolt (not shown). The second pressing member 52 is rotatably fixed to the shaft bolt and abuts against the friction block. 4 6 (second drive member 4 8 ) back side. Therefore, the seesaw 6 1 is pivotally connected to the pull rod 7 2 by the shaft bolt 5 9 . The upper end of the slab 6 1 is fixed with a pin 6 2 which is held by the end of the spring 63 3 and the other end of the spring is hung on the other pin 64 of the free end of the struts 55. The spring 63 is used to fix the two friction blocks 44, 46 (the driving members 47, 48) against the hub 45 (the driven member 49), and the lower end of the jaw 6 1 supported by the shaft pin 59 is provided with a shaft bolt 65. The connecting rod 6 6 is pivoted to the end, and the other end is pivotally connected to the strut by the shaft bolt 6 7 of the strut 5 5 . The two struts 5 5, 5 8 are thus movably connected to each other. In order to frictionally connect and disengage the friction blocks 44, 46 with the follower 49, a shifting transmission 6 8 is provided, which has an eccentric 7 1 provided on the shaft 69. The shaft 69 is fixed to the outer casing and is drivingly coupled to the arm shaft 5, i.e., it is driven by the arm shaft at a ratio of 1:1. The eccentric 7 1 interacts with the pull rod 7 2 , and the free end of the pull rod is pivotally connected with the support rod by the shaft bolt 5 9 of the support rod 5 8 , so that the support rod 58 and the support rod 55 connected by the connecting rod 66 can rotate respectively. Point 57, 54 swings. The shifting mechanism 6 which is basically provided as a four-joint shifting transmission allows the two rods 55, 58 to perform a reciprocating motion every time the arm shaft 5 or the shaft 69 makes one revolution. This reciprocating motion causes the two friction blocks 44, 46 (drive members 47, 48) to alternate against the hub 4 5 (the follower 4 9 ), and the hub then acts with the shaft 2 1 13 326\patent specification (supplement)\ 92-05\92103392 1295700 - A pulsating rotary motion consisting of two actions. Since the spring 63 holds the two friction blocks 44, 46 against the hub 45 to ensure a frictional connection of the friction block to the hub 45, the frictional connection only needs to overcome the force of the spring 63. The friction blocks 44, 46 are disengaged from the hub 45 by overcoming the spring force, with the proviso that the other friction blocks 46, 44 abut against the hub 45. The friction blocks 44, 46 alternately abut, and one friction block is continuously interchanged with the other friction block. Abutting against the friction block is released when the other friction block is in the form of engagement with the hub 45. Due to the mutual cooperation of the pressing movements of the springs 5 5, 5 8 , the friction blocks momentarily alternate against the hub, so that there is no time interval between the exchanges, i.e., the exchange of forces. This allows the hub 45 to be constantly controlled when the exchange is abutted. The two friction blocks briefly abut the hub. When the abutment of the friction blocks 44, 46 is adjusted and the transmission 68 is switched, the exchange is made at the moment when the friction blocks 44, 46 are turned back, and the speed of the friction block at this instant is equal to zero, so at the instant the two friction blocks (The two pressing members 51, 52) are frictionally connected to the hub 45 (the follower 49). Simultaneous momentary abutment of the two friction blocks 44, 46 against the hub 45 is achieved by the relative movement between the struts 58 and the second compression members 52. 2 shows the state in which the two friction blocks 4 4, 4 6 are exchanged, wherein the swinging motion of the strut 58 caused by the pull rod 72 drives the strut 55 via the connecting rod 66, so that the friction block 44 to abut the hub 45 is obtained. Close to the hub 45 and abut. When the rod 58 is moved, the jaw 61 swings about the shaft pin 59 to produce a relative movement to the rod 58 so that the friction block 46 to be released is still pressed against the hub 45 by the second pressing member 52. This momentary position of the hub 45 is fixed by the two friction blocks 44, 46. Then the seesaw 61 and the strut 58 are wound around the shaft pin 57 14 326 fixed on the outer casing\patent specification (supplement)\92·05\92103392 1295700 swinging so that the second pressing member 52 overcomes the force of the spring 63 Leaving the friction block 46 'the friction block is then detached from the hub 45 by frictional connection. The hub 45 (the follower 49) thus performs a pulsating rotary motion. During the first lifting movement of the push transmission 33, the first drive member 47 abuts against the peripheral surface of the follower 49, and during the second lifting movement of the push transmission 33 opposite to the first lifting movement direction, the second drive member 4 8 against the follower 49 9 circumferential surface, the exchange of the two drive members 47, 4 8 is controlled by the shifting transmission 68. Thus, the shaft 2 1 performs two co-rotating continuous rotational motions in each stitch generation period, which constitutes a pulsating rotary motion. Since the shaft 2 1 is drivingly coupled to the lower feed member 19, the pulsating rotary motion directly drives the lower feed member. In order to make the pulsating rotary motion also drive the upper feed member, the axle 21 is provided with a toothed pulley 73 which is drivingly coupled to the shaft 15 by a toothed belt 74 and another pulley 75. Since the joint stitch adjuster 27 can adjust the movement amount of the pull rods 36, 37, the movement direction can also be adjusted, so that the joint stitch adjuster 27 can be operated while adjusting or changing the feeding direction of the two feed members 17, 7 and / or feed the amount of exercise. In order to allow the sewing machine provided with the needle conveying device to simultaneously adjust the feeding movement of the needle 7 while operating the joint stitch adjuster 27, the crank 31 (Fig. 3) provided on the shaft 32 has another arm 76 through which A guide rod 77 and a suitable connecting member 78 of the rocker 14 allow the needle transporting device to perform a swinging motion by engaging the feed member 71, 19 in the amount of movement and the direction of motion. [Simple description of the drawing] 15 326\Patent specification (supplement)\92·05\92103392 1295700 Figure 1 is a front view of a sewing machine. Figure 2 is a schematic illustration of the principles of the invention. Figure 3 is a portion of the invention of a sewing machine. Figure 4 is a cross-sectional view of line 3 111-111 of Figure 3. Figure 5 is a cross-sectional view taken along line IV-IV of Figure 3. (Component number description) 1 Sewing machine 2 Cantilever 3 Pillar 4 Base 5 Arm shaft 6 Crank 7 Needle 8 Needle bar 9 Transmission 11 Shaft 12 Frame 13 Crank 14 Rocker 15 Shaft 1 6 Transmission 17 Upper feed 18 Bracket 19 Lower feed piece 16 326\Patent specification (supplement)\92-05\92103392 1295700 21 Axle 2 2 Eccentric wheel 23 Eccentric rod 2 4 Shaft bolt 25 Guide rod 26 Frame 27 Joint stitch adjuster 28 Shaft bolt 29 Arm 3 1 Crank 32 Axis 33 Push drive 34 Second arm 35 Axle pin 36 Pull rod 37 Pull rod 38 Shaft pin 39 Rocker arm 41 Shaft bolt 42 Rocker arm 44 Friction block 45 Hub 46 Friction block 47 First drive member 17
326\專利說明書(補件)\92-05\92103392 1295700 48 第二驅動件 49 從動件 5 1 第一壓緊件 52 第二壓緊件 5 3 支架 54 軸栓 55 支桿 56 部分 57 軸栓 58 支桿 59 軸栓 61 蹺板 62 銷 63 彈簧 64 銷 6 5 軸栓 6 6 連接桿 67 軸栓 68 轉換傳動裝置 69 軸 71偏心輪 72 拉桿 73 齒形皮帶輪 7 4 齒形皮帶 18326\Patent specification (supplement)\92-05\92103392 1295700 48 Second drive member 49 Follower 5 1 First compression member 52 Second compression member 5 3 Bracket 54 Shaft bolt 55 Strut 56 Part 57 Shaft Bolt 58 Strut 59 Shaft bolt 61 Truss 62 Pin 63 Spring 64 Pin 6 5 Shaft bolt 6 6 Connecting rod 67 Shaft bolt 68 Conversion gear 69 Shaft 71 Eccentric wheel 72 Pull rod 73 Toothed pulley 7 4 Toothed belt 18
326\專利說明書(補件)\92-05\92103392 1295700 7 5 皮帶輪 76 臂 77 導桿 78 連接件 19 326\專利說明書(補件)\92-05\92103392326\Patents (Repair)\92-05\92103392 1295700 7 5 Pulleys 76 Arms 77 Guides 78 Connections 19 326\Patents (Repair)\92-05\92103392