1270449 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種片材之切割方法及裝置，更係關於一 種用以將片材中一預定形狀之片體衝壓（p u n c h )之片材切 割技術。 【先前技術】 對於片材之切割，已有利用切割器及雷射等對片材加以 切割或衝壓之習知技術存在。其中，利用湯姆森沖模所為 之衝壓技術在處理速度或處理成本上較具優勢，也因此被 廣泛地使用（參見參考文件1 )。 此處，所稱片材之例子包含偏光板或延遲板、延遲膜、 反射板及其它習用光學片材。 呈衝壓形之帶狀湯姆森刀一般常作為衝壓用切割刀，其 中該衝壓形狀係指切割刀的切割緣大致形成為一環狀者， 不只可為矩形或圓形，亦可為預期之不規則形狀，視其應 用而定。 另一方面，一具有衝壓形之凹槽形成於一修整沖模中， 而切割刀即固定於該修整沖模中，且湯姆森刀固置於該凹 槽中。在該種設置中，該修整沖模稱作「切割沖模」，但 與一已知之切割沖模無異。 在切割進行之時，由於切割沖模隨湯姆森刀上下移動， 故設於一負載台上的一片材接受切割動作，以致於為該湯 姆森刀衝壓。 (參考文件 1) JP 2 0 0 2 - 1 1 6 9 7 A 312XP/發明說明書(補件)/94-04/93139995 1270449 然而，當湯姆森刀一往下切割片材並接著往上移動後， 被切割之片材（片體）可自負載台往上浮起，以下將藉圖6 說明此一狀態。 圖6為習知片材切割裝置在切割時的垂直剖面圖，其中 用以切割片材P之湯姆森刀5 1被固置於一切割沖模5 3 中，該切割沖模5 3為一可移動平台5 5固定於其背表面上。 可移動平台5 5支撐於一未顯示之驅動機構上，用以與湯姆 森刀51及切割沖模5 3 —起移動。 一負載台57固定於湯姆森刀51之對面，一下層片59設 於負載台57之上表面上，片材P設於下層片59之上，以 致於為湯姆森刀5 1所切割。當片材P被切割後，片材P沿 虛線箭頭方向被運送一段預定距離，以使待切割之一部分 在之後被設於一與湯姆森刀相對之位置上。 圖6顯示湯姆森刀5 1 —往下移動而切割片材P以將一片 體P 0自片材P中衝壓，並接著再度往上移動的狀態。此時， 切割片體P 0或P1可如圖示般飛起。附帶一提的是，圖6 中片體P 1及P 2係分別藉最後一發及最後一發之前一發衝 壓動作所得；當片體P0或其它者因此飛起時，片體P0或 其它者便離開其在切割前所在之處，以使片體P0等可被再 次切割（即所謂的重覆衝壓）。 在製造過程的一流程點上，當一片體離開其被切割之 處，其將變得難以在後續步驟（例如對體片之拾取操作）中 受到正確的處理，此時便有損耗產生。再者，當進行重覆 衝壓動作時，各主要切割步驟都將不能適當地達成。 6 312XP/發明說明書(補件)/94-04/93139995 1270449 本發明係在考慮此一狀況而得，其目的在於提出一種片 材之切割方法及裝置，以防止一自片材衝壓之片體浮起或 即便浮起亦會掉落至接近該片體被切割的位置。 【發明内容】 本案發明人已完成深入研究以檢視上述問題。結果，了 解到片體自片材中衝壓後往上浮起或掉落係因一切割沖模 及一負載台間存有一空氣流之故。再者，本案發明人亦了 解到該切割沖模及該負載台間的空間内相對於周圍環境有 一負壓存在，其係因該切割沖模往上移動而讓空氣自周圍 流進該空間所致，本發明之提出即係根據此一發現而得。 本發明之主要特徵列於下述： (1 ) 一種片材之切割方法，其包含下列步驟··切割一設於 一負載台上的片材，藉由一切割刀為之，其中該切割刀固 接至一切割沖模，用以將一片體自該片材中衝壓；及供應 經壓縮空氣至該切割沖模及該負載台間的空間中，且供應 之時為自切割動作之起始至終結期間的至少一時間點。 (2 )如第（1 )項所述之片材之切割方法，其中該經壓縮空 氣被供應至該片體上，用以對該片體施加一施壓力。 (3 )如第（1 )或（2 )項之片材之切割方法，其中供應該經壓 縮空氣係始於該片材為該切割刀切割之時。 (4 )如第（1 )或（2 )項之片材之切割方法，其中該片材係為 該切割刀之上下移動所切割，且起始供應該經壓縮空氣於 該切割刀往下移動之後及剛欲往上移動之前。 (5 )如第（1 )或（2 )項之片材之切割方法，其中該經壓縮空 7 312XP/發明說明書(補件)/94-04/93139995 1270449 氣係供應於該片體往上浮起至距該負載台一預定高 起一預定時間後進行。 (6 ) —種片材之切割裝置，其包含一切割元件，具 割刀，該切割刀置於一切割沖模中，並切割一設於 台上之一片材，以自該片材中衝壓一片體；一負載 設於一與該切割刀相對之位置上；及一氣體供應元 以供應經壓縮之氣體至該切割刀及該負載台間之空 且供應之時為該切割動作之起始至終結期間的至少 點。 (7 )如第（6 )項所述之片材之切割裝置，其中該氣 元件包含：一氣體供應埠，用以供應經壓縮空氣至 中；及一氣體供應導管，與該氣體供應埠相接，其 氣體供應埠設於該切割沖模中，且該氣體供應導管 為該切割沖模中之一凹槽部分收納。 (8 ) —種片材之切割方法，其包含下列步驟：切割 一負載台上之一片材，藉由一切割刀切割之，其中 刀固接至一切割沖模，以自該片材上衝壓一片體； 防止成避免一相對於周圍空氣為負壓之壓力在一切 中產生於該切割沖模及該負載台間的空間中。 (9 )如第（8 )項之片材之切割方法，其中該防止或 驟包含下列步驟：藉由預先在該切割沖模或該負載 供一開口以使該空間與該空氣相通而允許空氣進入 間。 根據第（1 )項之實施例，由於經壓縮空氣在該切割 312XP/發明說明書(補件)/94-(M/9313卯95 度或浮 有一切 該負載 台，固 件，用 間中， 一時間 體供應 該空間 中，該 設置成 一設於 該切割 及用以 割動作 避免步 台中提 該空 刀切割 1270449 一片材以自其中衝壓一片體時的至少一時間點上供應至該 切割沖模及該負載台間的空間中。故，可防止該空間存有 相對於周圍環境為負壓之壓力，即便在該切割刀往上移動 時亦然。因此，可防止空氣自該周圍環境流進該負載台上。 因此，該負載台上不會產生空氣流，故自該片材衝壓之該 片體不會自該負載台上浮起。 附帶一提的是，本發明中的切割時間包含該切割動作之 起始及終結期間的一時間區段。舉例而言，當該切割刀往 上或往下移動時，切割時間係指自該切割刀開始自一預定 位置上往下移動至該切割刀並再次往上移動而回至該預定 位置止。此外，供應該經壓縮氣體以在該片體自該片材中 為該切割刀衝壓之後、並在該切割刀在該段時間中剛要往 上移動之前進行為較佳。再者，如第（5 )項之實施例所述， 本發明包含下述實施例：該氣體之供應係於該切割片體往 上浮至距該負載台一預定高度或往上浮起一預定時間之時 進行。 結果，當片體自該負載台浮起時，該經壓縮空氣可供應 於一預定位置上或可在預定時間時供應之，用以使該片體 掉落至接近其被切割之位置。 附帶一提的是，在上述每一實施例中，由於處理速度不 需降低以供應經壓縮空氣至該切割沖模及該負載台間的空 間中，故其量產能力可被維持。 因此，根據本發明，量產能力得在自該片材衝壓之片體 不會浮起或即便浮起亦會掉落至接近該片體被切割之位置 312XP/發明說明書(補件)/94-04/93139995 1270449 的條件下獲得維持。因此，片材切割之過程被適當地進行。 附帶一提的是，本發明之實施例中，該片材可為偏光板、 延遲板、延遲膜、反射板、其它習知光學片材或膜或紙片 或布片等薄片，其中「片體」係特別用以指該片材被衝壓 之部分。 在對應第（2 )項之實施例中，除在當次衝壓動作所切割得 之片體外，在之前所為的衝壓動作所切割得之片體亦出現 於該切割沖模及該負載台間的空間中，其中每一片體皆易 因空氣流之影響而飛起。根據第（2 )項之實施例，經壓縮空 氣在切割之時被供應至該等片體處之該空間中。因此，可 防止該空間存有負壓，故此一空氣流之產生受到抑制。此 外，一施壓力直接施加至每一片體上，故可防止片體飛起。 當經壓縮空氣被供應至該切割沖模及該負載台間之空間 中時，一垂直往上之壓力作用於該切割沖模上，其中該作 用方向與該切割沖模之向下移動方向相反。根據第（3 )項之 實施例中，切割刀之向下移動已於片材為切割刀切割之前 完成，故切割動作不因經壓縮空氣之供應而受干擾。再者， 當經壓縮空氣在片材切割之時即被供應，該切割沖模及該 負載台間的空間中足以防止負壓的出現。 另一方面，當經壓縮空氣送至切割刀所構成之一中空部 分時，進行下述操作。當片材已為切割刀切割，經壓縮空 氣之供應便不影響以相同方式執行的切割動作。此外，施 壓力愈早送至經切割之片體上，則片體自負載台往上浮起 之現象愈受到抑制。因此，當片材為切割刀所切割之時經 10 312XP/發明說明書(補件)/94-04/93139995 1270449 壓縮空氣即開始被送入，故施壓力可有效並較早施加至片 體上。 根據第（4 )項之實施例，在往上及往下移動期間，切割刀 於往下移動之後及剛欲往上移動之前位於最低位置，而在 該時間之前片體材料已經切割完畢。因此，當經壓縮空氣 於該時間被供應時，則切割動作不受到影響，但切割刀及 負載台間的空間可在早期階段即不存有負壓。 根據第（6 )項之實施例，可防止切割沖模及負載台間的空 間中有相對於周圍環境為負壓之壓力存在，即便在該切割 刀往上移動時亦然，故空氣可不自周圍環境流至負載台 上。因此，於負載台上不會產生空氣流，片材中衝壓之片 體不會自負載台往上浮起。 根據第（7 )項之實施例，經壓縮空氣可自切割沖模中的氣 體供應埠垂直往下送。因此，一施壓力可直接加至該片體 上。此外，該氣體供應導管納置於該切割沖模中之凹槽内。 因此，氣體供應導管及其它任何部分等之間不會有干擾產 生。 根據第（8 )項之實施例，可防止切割沖模及負載台間的空 間中存有負壓。故，空氣流不會自周圍環境流進該空間中。 因此，片材不會往上浮起或即便該片材浮起時亦會掉落至 接近其被切割之位置。 切割沖模及負載台間的空間原對外部空氣係開放者。然 而，該空間可暫時存有負壓。根據第（9 )項之實施例，切割 沖模及負載台間的空間設計為對外部空氣為更進一步開放 11 312XP/發明說明書(補件)/94-04/93139995 1270449 者，以致於可防止該空間具有負壓。因此，可防止該片材 往上浮起。 【實施方式】 現將配合圖式對本發明加以詳盡說明，但不代表本發明 僅限於以下所說明者。 (實施例1 ) 圖1為本發明之片材切割裝置實施例的示意圖。 根據此實施例之片材切割裝置具有一可移動切割部分1 及一負載台2、一氣體供應部分3及一控制元件4，其中該 可移動切割部分1及該負載台2用以切割一片材P，該控 制元件4用以在切割進行之時供應經壓縮空氣。在本發明 中，該可移動切割部分1對應切割元件，且該氣體供應部 分3對應氣體供應元件。 可移動切割部分1具有湯姆森刀Π、一切割沖模1 3及 一可移動平台1 7，其中該等湯姆森刀1 1用以切割片材P， 該切割沖模1 3用以固定該等湯姆森刀1 1，而該可移動平 台1 7用以固定該切割沖模1 3於其背表面側。可移動平台 1 7為一未顯示之曲柄機構所支撐。當切割動作進行時，可 移動平台1 7因該曲柄機構所傳來之驅動力而往上及往下 移動。此時，湯姆森刀1 1及切割沖模1 3亦與可移動平台 1 7 —起往上及往下移動。 此處，可移動平台1 7之驅動源不僅可為曲柄機構， 任何能令可移動平台1 7往上及往下移動之機構皆適於當 作該驅動源，如可為一氣缸機構。 12 312XP/發明說明書(補件)/94-04/93139995 1270449 附帶一提的是，湯姆森刀11對應本發明之切割刀。 在本說明書之說明中，切割沖模1 3之為湯姆森刀1 1設 置之表面被稱作切割沖模1 3之「前表面」，且切割沖模 1 3之受支撐於可移動平台1 7上之表面被稱作切割沖模1 3 之「背表面」。 該負載台2固定設置於可移動切割部分1下方，為使湯 姆森刀1 1不致於在切割動作進行之時與負載台2衝撞並因 此受到破壞，一下層片2 1因此設於該負載台2的上表面 上。在本實施例中，係使用聚對苯二甲酸乙二酯（PET)材料 構成該下層片21。PET具有作為下層之適當硬度、高耐久 性及較少的外來物產生等，其中外來物的低產生性即便在 湯姆森刀1 1對其蝕去時亦然。 氣體供應部分3用以對氣體供應源3 1所供應之經壓縮空 氣加以噴灑，其中氣體供應埠3 7 a及3 7 b設於切割沖模1 3 中，氣體供應源3 1則具有一未顯示之壓縮器，經壓縮之空 氣便係經由該處送出。每一空氣管35之一端連接至如上述 設置之氣體供應源3 1，用以使上述二者得互通。每一空氣 管3 5係自切割沖模1 3之一側部分經由一散霧器3 2、一電 磁開關閥3 3及一流動調節閥3 4而導入切割沖模1 3中，凹 槽部分15中設有空氣管35，該空氣管35插置於穿孔14 中，而該等穿孔1 4形成於該切割沖模1 3中。與空氣管3 5 相通之氣體供應埠3 7 a及3 7 b設於切割沖模1 3之前側上該 等穿孔14a及14b的開口内。 此處，該欲為氣體供應源3 1供應之氣體不受限為經壓縮 13 312XP/發明說明書(補件)/94-04/93139995 1270449 空氣。該氣體可依使用環境而適當加以選擇。該氣體之例 子包含惰性氣體。 由於散霧器3 2之存在，經壓縮空氣中所含微粒及油成份 等可被消除，故可供應乾淨空氣。 附帶一提的是，空氣管35對應至本發明中之氣體供應導 管。 控制元件4自一未顯示之湯姆森刀1 1的位置偵測感測器 接收一偵測訊號，並依據該湯姆森刀1 1的位置操作前述之 電磁開關閥3 3，以控制該經壓縮空氣的供應時脈至可移動 切割部分1中。此外，控制元件4亦可控制流動調節閥3 4 之操作。 再者，根據本實施例之裝置具有一未顯示之片材供入機 構，片材P即藉由該片材供入機構供應。舉例而言，當待 切割片材P為一捲狀物，則該裝置之片材供入機構係由一 以可旋轉方式支撐該捲狀物之捲線筒等所構成，以致於片 材P能被置放及送出。 此外，根據本實施例之裝置具有一未顯示之片材傳送機 構，該片材P即藉由該片材傳送機構傳送至負載台2上， 且每一切割動作所落之處相距一預定供入間距，其中該待 切割片材P係與該湯姆森刀1 1相對位置而安置。 以下將對可移動切割部分1及氣體供應部分3詳加說 明。圖2為根據本實施例之切割沖模自其背面所視之平面 圖，圖3 A為自圖2箭頭A - A所截得之該切割沖模的垂直剖 面圖，圖3B則為只顯示切割刀之前視圖。 14 312XP/發明說明書(補件)/94-04/93139995 1270449 切割沖模1 3係由矩形膠合板製成，其中凹槽形成為一種 可加衝壓之形狀，在本實施例中該可加衝壓之形狀為矩 形。每一形成為矩形之湯姆森刀11卡合至凹槽而固定。在 本實施例中，四個矩形湯姆森刀1 1設於一切割沖模1 3中。 每一湯姆森刀1 1之形狀不受限為矩形，其亦可為圓形、多 邊形或其它不規則形。 每一湯姆森刀1 1被設置為面向一與切割沖模1 3 —側邊 夾4 5度之方向，用以在切割沖模1 3之中央部分中形成一 線。在本實施例中，所處理之片材P為一偏光板，該待切 割之偏光板的吸收軸傾斜4 5度，因此每一湯姆森刀1 1之 角度為可加以設計者，且該角度需為可加適當變更者。 再者，在此實施例中，空氣管3 5插置於四個穿孔1 4 a中。 該等穿孔1 4 a分別自切割沖模1 3之背表面垂直延伸至其前 表面，並因此至湯姆森刀1 1形成之中空部分的中心。另 者，穿孔1 4b自片材P之傳送方向，以對應於其之供入間 距自穿孔1 4 a平行設置於取代位置。此處，供入間距為每 一切割動作進行之片材送入距離。故，前幾回切割動作所 衝壓之片體會在穿孔14b下方垂直疊起。 此外，用以使空氣管35在其中受良好卡合‘的凹槽部分 1 5係設置在切割沖模1 3之背表面。每一穿孔1 4 a，1 4 b延 伸至切割沖模1 3之一側部分，其中每一凹槽部分1 5的深 度及寬度稍大於每一空氣管35之外徑。 此處，如圖3 A及圖3 B所示，一槽口 1 2預先設於湯姆森 刀1 1上，於每一凹槽部分1 5之位置橫跨其之對應的湯姆 15 312XP/發明說明書(補件)/94-04/93139995 1270449 森刀1 1。 其理由如下，亦即，如圖3 A所示，即卡合於切割沖模 1 3之湯姆森刀1 1觸及切割沖模1 3之背表面時之位置處不 能形成凹槽部分1 5。 因此，一 U形槽口 1 2被切割於卡合於形成凹槽部分1 5 之位置之湯姆森刀1 1的背部。故，可避免湯姆森刀1 1受 凹槽部分1 5的干擾。 以此一方式，八個空氣管35納置於穿孔14a及14b及切 割沖模1 3背表面中的凹槽部分1 5内。插置於穿孔1 4 a及 14b中的空氣管35與氣體供應埠37a及37b相接合，以使 彼此相通。另一方面，每一空氣管3 5之其它端側上設有流 動調節閥3 4及電磁開關閥3 3，但圖2中並未顯示。 在本實施例中，厚度為1 8mm的膠合板用作為該切割沖模 13，且一外徑為6mm的管被用作為每一空氣管35。形成於 每一湯姆森刀1 1背部内的槽口 1 2為8mm寬。 因此，由於各空氣管3 5的設置，不需分別提供空間容置 之，例如切割沖模1 3的厚度不需增加，故可移動平台1 7 可不受該等空氣管35之干擾。 接著，將配合圖4及圖5說明根據本實施例之片材切割 裝置的操作。圖4及圖5為本實施例在切割進行之時該片 材切割裝置之一主要部分的垂直剖面圖。 片材P為一未顯示之片材傳送機構所傳送，其待切割之 一部分準確放置於與湯姆森刀1 1相對之處。此時，在最後 一切割動作時被切割開來的一片體P1已置於切割沖模1 3 16 312XP/發明說明書(補件)/94-〇4/93139995 1270449 及負載台2之間。 接著，一系列切割動作將進行，該等動作將說明如下。 首先，如圖4所示，可移動平台17為一未顯示之曲柄機 構驅動，以往下移動至負載台2上支撐之片材P處，此時 每一湯姆森刀1 1及可移動沖模1 3亦與可移動平台1 7 —起 移動。 湯姆森刀1 1之切割緣先觸及片材P，接著湯姆森刀1 1 立即切割該片材P，以對該片材P加以衝壓。 當可移動平台17往下移動至一預定位置時，可移動平台 1 7不再往下移動。 當湯姆森刀1 1上之一未顯示之位置偵測感測器偵測得 該可移動平台1 7不再往下移動，則位置偵測感測器輸出一 訊號至控制元件4。 當該發送自位置偵測感測器之訊號進入控制元件4，該 控制元件4會將電磁開關閥3 3打開。附帶一提的是，流動 調節闊3 4之開口可預先根據實驗等結果加以調整至一適 用值。 氣體供應源3 1所提供之經壓縮空氣經由空氣管3 5送至 氣體供應埠3 7，故該經壓縮空氣被送至切割沖模1 3及負 載台2間的空間中，如圖5之虛線箭頭所指。 亦即，控制部分4對電磁開關闊3 3加以操作及控制以在 湯姆森刀1 1往下移動之後及往上移動剛欲進行之前開始 供應該氣體，故氣體供應部分3在該時間開始供應氣體。 控制部分4在一預定時間過後關閉該電磁開關闊3 3，接 17 312XP/發明說明書(補件)/94-04/93139995 1270449 著經壓縮氣體對氣體供應埠3 7 a及3 7 b之供應動作停止。 在本實施例中，該經壓縮氣體被設定為在0 · 5秒後停止， 其中經壓縮空氣之供應時間、供應停止時間及供應速率等 的設定及選擇係依實驗結果而為。 另一方面，可移動平台1 7在往下移動動作停止後開始藉 由未顯示之曲柄機構往上移動，此時湯姆森刀1 1與該可移 動平台17 —起往上移動。 此時，經壓縮空氣已送至切割沖模1 3及負載台2間的空 間中。故，即便在可移動平台1 7往上移動時，該空間亦不 會存有負壓。因此，氣體不會自周圍流入該空間中。再者， 一施壓力因該經壓縮空氣之送入而加至該等片體P0及P1 上。故，可防止片體P0及P1往上浮起，也因此該切割方 法得以適當地執行。 當可移動平台17返回至其起始位置，並停止該上移動 時，該系列切割操作被結束。 負載台2上所設片材P再次為未顯示之片材傳送機構所 支撐，且該支撐處使得待切割>!材P之一部分面對湯姆森 刀1 1。 下一切割動作以同於前述切割方法之方式進行。 本發明之内容不受限於前述實施例，其亦得以後文所述 之變更實施例為之。 (實施例2 ) 雖然實施例1中已說明一氣體供應埠3 7 a、3 7 b係設置於 每一湯姆森刀1 1所圍繞之位置處，但本發明不受限於此一 18 312XP/發明說明書(補件)/94-04/93139995 1270449 構成。亦即，若經壓縮空氣可供應至切割沖模1 3及負載台 2間的空間中，則僅提供該氣體供應埠3 7 b即可。 或者，該氣體供應埠3 7 a及3 7 b可均勻設於切割沖模1 3 的前表面上。 再者，氣體供應埠3 7可設於切割沖模1 3之外圍部分上， 故可避免片材之端部分被拍擊。 (實施例3 ) 實施例2中每一氣體供應埠3 7 a、3 7 b的形狀可加改變， 以輻射向將經壓縮空氣加以喷灑。再者，每一氣體供應埠 37a、37b之每一者的開口區域可加以擴大而以更大的範圍 噴灑經壓縮空氣。 每一穿孔1 4 a、1 4 b之形狀亦適度依每一空氣供應埠 3 7 a、3 7 b之形狀或方向而改變。舉例而言，穿孔1 4 a、1 4 b 可設成傾斜並與切割沖模1 3表面夾一角度。 (實施例4 ) 雖然上述實施例顯示壓縮氣體之供應係起始於可移動平 台1 7往下移動之後及剛欲往上移動之前之情況，但本發明 係不受限於此。舉例而言，經壓縮空氣之供應可在片材P 一被切割或湯姆森刀1 1 一觸及下層片2 1之時即開始進 行。此時，本實施例之控制部分4及未顯示之位置偵測感 測器可適當加以改、變。1270449 IX. Description of the Invention: [Technical Field] The present invention relates to a method and a device for cutting a sheet, and more particularly to a sheet for punching a sheet of a predetermined shape in a sheet. technology. [Prior Art] For the cutting of sheets, there have been conventional techniques for cutting or stamping sheets by using a cutter and a laser. Among them, the stamping technique using the Thomson die is advantageous in terms of processing speed or processing cost, and is therefore widely used (see Reference 1). Here, examples of the sheet referred to include a polarizing plate or a retardation plate, a retardation film, a reflecting plate, and other conventional optical sheets. A strip-shaped Thomson knife in the form of a stamping is generally used as a cutting knife for punching, wherein the stamping shape means that the cutting edge of the cutting blade is formed substantially in a ring shape, not only rectangular or circular, but also expected. Regular shapes, depending on their application. On the other hand, a groove having a press shape is formed in a trimming die, and the cutter is fixed in the trimming die, and the Thomson blade is fixed in the groove. In this arrangement, the trim die is referred to as a "cut die," but is identical to a known die. At the time of the cutting, since the cutting die moves up and down with the Thomson blade, the sheet set on a load table receives the cutting action, so that the Thomson knife is punched. (Reference 1) JP 2 0 0 2 - 1 1 6 9 7 A 312XP/Invention Manual (Supplement)/94-04/93139995 1270449 However, when the Thomson knife cuts the sheet down and then moves up The cut sheet (sheet) can be lifted up from the load table. This state will be described below with reference to FIG. Figure 6 is a vertical sectional view of a conventional sheet cutting device during cutting, in which a Thomson blade 51 for cutting a sheet P is fixed in a cutting die 53, which is a movable The platform 5 5 is fixed to its back surface. The movable platform 55 is supported on a drive mechanism not shown for movement with the Tomson knife 51 and the cutting die 53. A load table 57 is fixed to the opposite side of the Thomson blade 51, and a lower layer 59 is provided on the upper surface of the load table 57. The sheet P is placed on the lower layer sheet 59 so as to be cut by the Thomson knife 51. After the sheet P is cut, the sheet P is conveyed a predetermined distance in the direction of the dotted arrow so that a portion to be cut is then placed at a position opposite to the Thomson blade. Fig. 6 shows a state in which the Thomson blade 5 1 - moves downward to cut the sheet P to punch the sheet P 0 from the sheet P, and then moves upward again. At this time, the cut piece P 0 or P1 can fly as shown. Incidentally, in Fig. 6, the sheets P 1 and P 2 are respectively obtained by a punching action before the last one and the last one; when the sheet P0 or others are thus flying, the sheet P0 or the like The person leaves the place where it was before the cutting so that the sheet P0 or the like can be cut again (so-called repeated stamping). At a point in the manufacturing process, when a piece leaves its cut position, it becomes difficult to be properly handled in a subsequent step (e.g., picking up a body piece), at which point loss occurs. Further, when the repeated punching operation is performed, each of the main cutting steps cannot be properly achieved. 6 312XP/Invention Manual (Supplement)/94-04/93139995 1270449 The present invention has been made in consideration of such a situation, and an object thereof is to provide a sheet cutting method and apparatus for preventing a sheet from stamping a sheet. Floating or even floating will fall to a position close to where the sheet is cut. SUMMARY OF THE INVENTION The inventors of the present invention have completed intensive studies to examine the above problems. As a result, it is understood that the sheet is lifted or dropped from the sheet after being punched, and the air is discharged by a cutting die and a load table. Furthermore, the inventor of the present invention also knows that there is a negative pressure in the space between the cutting die and the load table relative to the surrounding environment, which is caused by the moving of the cutting die upwards to allow air to flow into the space from the surroundings. The present invention has been made in accordance with this finding. The main features of the present invention are as follows: (1) A method of cutting a sheet comprising the following steps: cutting a sheet provided on a load table by a cutting blade, wherein the cutting blade Secured to a cutting die for stamping a piece of material from the sheet; and supplying compressed air to the space between the cutting die and the load table, and supplying from the beginning to the end of the self-cutting action At least one point in time. (2) The method of cutting a sheet according to the item (1), wherein the compressed air is supplied to the sheet to apply a pressure to the sheet. (3) The method of cutting a sheet according to item (1) or (2), wherein the supplying the compressed air system starts when the sheet is cut by the cutting blade. (4) The method of cutting a sheet according to item (1) or (2), wherein the sheet is cut by moving the cutter upward and downward, and the compressed air is initially supplied to move downwardly from the cutter After and just want to move up. (5) The method of cutting a sheet according to item (1) or (2), wherein the compressed air 7 312XP/invention specification (supplement)/94-04/93139995 1270449 gas system is supplied to the sheet to float upward It is performed after a predetermined time from a predetermined height of the load station. (6) A cutting device for a sheet comprising a cutting member having a cutter, the cutter being placed in a cutting die, and cutting a sheet disposed on the table to punch from the sheet a body; a load is disposed at a position opposite to the cutter; and a gas supply unit supplies the compressed gas to the space between the cutter and the load table and supplies the start of the cutting operation At least to the end of the period. (7) The cutting device for a sheet according to the item (6), wherein the gas element comprises: a gas supply port for supplying compressed air to the medium; and a gas supply conduit connected to the gas supply port The gas supply port is disposed in the cutting die, and the gas supply conduit is received in a groove portion of the cutting die. (8) A method for cutting a sheet comprising the steps of: cutting a sheet on a load table, cutting it by a cutter, wherein the knife is fixed to a cutting die to punch from the sheet A piece of body; prevents the pressure from being negatively applied to the surrounding air in all of the space between the cutting die and the load table. (9) The method of cutting a sheet according to item (8), wherein the preventing or the step comprises the step of allowing air to enter by previously providing an opening in the cutting die or the load to allow the space to communicate with the air. between. According to the embodiment of item (1), due to the compressed air in the cutting 312XP / invention manual (supplement) / 94 - (M / 9313 卯 95 degrees or floating all the load station, firmware, in between, one The time body is supplied to the space, and the setting is provided to the cutting die and at least one time point when the cutting and cutting action is used to avoid the empty knife cutting the 1270449 piece of material to punch a piece from the cutting piece and The space between the load stages is such that the space can be prevented from being under a negative pressure with respect to the surrounding environment, even when the cutter moves upward. Therefore, air can be prevented from flowing into the surrounding environment. Therefore, no air flow is generated on the load table, so the sheet stamped from the sheet does not float from the load table. Incidentally, the cutting time in the present invention includes the cutting a period of time during the start and end of the action. For example, when the cutter moves up or down, the cutting time refers to moving from the predetermined position to the cutting knife from the cutting knife. And then Moving upwards and returning to the predetermined position. Further, the compressed gas is supplied to move the sheet after the sheet is stamped from the sheet for the cutting blade, and the cutting knife is just moving up during the period of time Further, as described in the embodiment of the item (5), the present invention includes the following embodiments: the supply of the gas is performed until the cutting piece floats up to a predetermined height from the load stage or The floating up is performed for a predetermined time. As a result, when the sheet is floated from the loading platform, the compressed air may be supplied to a predetermined position or may be supplied at a predetermined time for the sheet to be dropped. It is close to the position where it is cut. Incidentally, in each of the above embodiments, since the processing speed does not need to be lowered to supply compressed air to the space between the cutting die and the load table, the amount thereof The production capacity can be maintained. Therefore, according to the present invention, the mass production capability is such that the sheet stamped from the sheet does not float or even floats up to the position where the sheet is cut. 312XP/Invention Manual (supplement) /94-04/93139995 Maintenance is maintained under the conditions of 1270449. Therefore, the sheet cutting process is suitably performed. Incidentally, in the embodiment of the present invention, the sheet may be a polarizing plate, a retardation plate, a retardation film, a reflection plate, and the like. A conventional optical sheet or film or a sheet such as a sheet of paper or a sheet, wherein the "sheet" is particularly used to refer to the portion to which the sheet is stamped. In the embodiment corresponding to the item (2), except in the current stamping Outside the sheet cut by the action, the sheet cut by the previously punching action also appears in the space between the cutting die and the load table, and each of the pieces is easily flying due to the influence of the air flow. According to the embodiment of the item (2), the compressed air is supplied to the space at the sheets at the time of cutting. Therefore, the negative pressure is prevented in the space, so that the generation of the air flow is suppressed. In addition, a pressure is applied directly to each of the sheets, so that the sheet can be prevented from flying. When compressed air is supplied into the space between the cutting die and the load table, a vertical upward pressure acts on the cutting die, wherein the direction of action is opposite to the downward moving direction of the cutting die. According to the embodiment of the item (3), the downward movement of the cutting blade is completed before the sheet is cut by the cutting blade, so that the cutting action is not disturbed by the supply of compressed air. Further, when compressed air is supplied at the time of sheet cutting, the space between the cutting die and the load table is sufficient to prevent the occurrence of negative pressure. On the other hand, when compressed air is supplied to one of the hollow portions of the cutter, the following operation is performed. When the sheet has been cut for the cutter, the supply of compressed air does not affect the cutting action performed in the same manner. In addition, the earlier the application pressure is applied to the cut piece, the more the phenomenon of the sheet floating upward from the load table is suppressed. Therefore, when the sheet is cut by the cutter, the compressed air is initially fed through the 10 312XP/invention manual (supplement)/94-04/93139995 1270449, so that the applied pressure can be effectively applied to the sheet earlier. . According to the embodiment of the item (4), during the upward movement and the downward movement, the cutting blade is at the lowest position after moving downward and just before moving upward, and the sheet material has been cut before the time. Therefore, when compressed air is supplied at this time, the cutting action is not affected, but the space between the cutting blade and the load table can be free of negative pressure at an early stage. According to the embodiment of the item (6), it is possible to prevent the pressure between the cutting die and the load table from being negative with respect to the surrounding environment, even when the cutting blade moves upward, the air may not be from the surroundings. The environment flows to the load platform. Therefore, no air flow is generated on the load table, and the stamped sheet in the sheet does not float upward from the load table. According to the embodiment of the item (7), the compressed air can be supplied vertically from the gas supply in the cutting die. Therefore, a pressure can be applied directly to the sheet. In addition, the gas supply conduit is placed in a recess in the cutting die. Therefore, there is no interference between the gas supply conduit and any other parts and the like. According to the embodiment of the item (8), it is possible to prevent a negative pressure from being present in the space between the cutting die and the load table. Therefore, air flow does not flow into the space from the surrounding environment. Therefore, the sheet does not float upward or falls to a position close to where it is cut even if the sheet floats. The space between the cutting die and the load table is originally open to the outside air system. However, this space can temporarily contain negative pressure. According to the embodiment of the item (9), the space between the cutting die and the load table is designed to be further open to the outside air 11 312 XP / invention specification (supplement) /94-04/93139995 1270449, so that the The space has a negative pressure. Therefore, the sheet can be prevented from floating upward. [Embodiment] The present invention will be described in detail with reference to the drawings, but the invention is not limited to the description below. (Embodiment 1) Fig. 1 is a schematic view showing an embodiment of a sheet cutting device of the present invention. The sheet cutting device according to this embodiment has a movable cutting portion 1 and a load table 2, a gas supply portion 3, and a control member 4, wherein the movable cutting portion 1 and the load table 2 are used for cutting a piece Material P, the control element 4 is used to supply compressed air as the cutting proceeds. In the present invention, the movable cutting portion 1 corresponds to a cutting member, and the gas supply portion 3 corresponds to a gas supply member. The movable cutting portion 1 has a Thomson blade, a cutting die 13 and a movable platform 17 which are used to cut the sheet P, and the cutting die 13 is used to fix the tom The cutter 1 1 is used to fix the cutting die 13 to the side of the back surface thereof. The movable platform 17 is supported by an undisplayed crank mechanism. When the cutting operation is performed, the movable platform 17 moves up and down due to the driving force transmitted from the crank mechanism. At this time, the Thomson knife 1 1 and the cutting die 13 are also moved up and down with the movable platform 17 . Here, the driving source of the movable platform 17 can be not only a crank mechanism, but any mechanism that can move the movable platform 17 upward and downward is suitable as the driving source, such as a cylinder mechanism. 12 312XP/Invention Manual (Supplement)/94-04/93139995 1270449 Incidentally, the Thomson blade 11 corresponds to the cutting blade of the present invention. In the description of the present specification, the surface on which the cutting die 13 is set to the Thomson blade 1 is referred to as the "front surface" of the cutting die 13, and the cutting die 13 is supported on the movable platform 17 The surface is referred to as the "back surface" of the cutting die 13. The load table 2 is fixedly disposed under the movable cutting portion 1 so that the Thomson knife 11 is not collided with the load table 2 and is thus damaged when the cutting operation is performed, and the lower layer 2 1 is thus disposed on the load table. 2 on the upper surface. In the present embodiment, the underlayer sheet 21 is formed using a polyethylene terephthalate (PET) material. PET has appropriate hardness as a lower layer, high durability, and less foreign matter generation, etc., in which the low generation of foreign matter is the same even when the Thomson knife 11 erodes it. The gas supply portion 3 is for spraying the compressed air supplied from the gas supply source 31, wherein the gas supply 埠3 7 a and 3 7 b are disposed in the cutting die 13 and the gas supply source 31 has a not displayed The compressed air is sent through the compressed air. One end of each air tube 35 is connected to a gas supply source 3 1 as set forth above for intercommunication. Each of the air tubes 35 is introduced into the cutting die 13 from a side portion of the cutting die 13 through a mist eliminator 3 2, an electromagnetic switching valve 3 3 and a flow regulating valve 34, in the groove portion 15. An air tube 35 is provided, which is inserted into the perforation 14, and the perforations 14 are formed in the cutting die 13. Gas supplies 埠3 7 a and 3 7 b communicating with the air tube 35 are provided in the openings of the perforations 14a and 14b on the front side of the cutting die 13. Here, the gas to be supplied to the gas supply source 31 is not limited to the compressed air of 13 312 XP/invention specification (supplement)/94-04/93139995 1270449. The gas can be appropriately selected depending on the use environment. Examples of the gas include an inert gas. Due to the presence of the mist eliminator 32, the particulates and oil components contained in the compressed air can be eliminated, so that clean air can be supplied. Incidentally, the air tube 35 corresponds to the gas supply pipe in the present invention. The control component 4 receives a detection signal from a position detecting sensor of a Thomson knife 1 that is not shown, and operates the electromagnetic opening and closing valve 3 3 according to the position of the Thomson blade 1 to control the compression. The supply of air is supplied to the movable cutting portion 1. Furthermore, the control element 4 can also control the operation of the flow regulating valve 34. Further, the apparatus according to the present embodiment has an unillustrated sheet feeding mechanism, and the sheet P is supplied by the sheet feeding mechanism. For example, when the sheet P to be cut is a roll, the sheet feeding mechanism of the apparatus is constituted by a spool or the like that rotatably supports the roll, so that the sheet P can Being placed and sent out. Further, the apparatus according to the embodiment has a sheet conveying mechanism which is not shown, and the sheet P is conveyed to the loading table 2 by the sheet conveying mechanism, and each cutting operation is spaced apart by a predetermined supply. Into the spacing, wherein the sheet to be cut P is placed in position relative to the Thomson blade 11. The movable cutting portion 1 and the gas supply portion 3 will be described in detail below. 2 is a plan view of the cutting die according to the present embodiment as viewed from the back thereof, FIG. 3A is a vertical sectional view of the cutting die taken from arrow A-A of FIG. 2, and FIG. 3B is only showing the cutting blade before view. 14 312XP/Invention Manual (Supplement)/94-04/93139995 1270449 The cutting die 13 is made of a rectangular plywood in which the groove is formed into a stampable shape, which in this embodiment can be stamped. It is a rectangle. Each of the Thomson blades 11 formed in a rectangular shape is engaged to the groove and fixed. In the present embodiment, four rectangular Thomson blades 1 1 are provided in a cutting die 13. The shape of each Thomson blade 1 is not limited to a rectangle, and may be a circle, a polygon or other irregular shape. Each Thomson blade 1 1 is disposed to face a direction of a cutting edge of the cutting die 13 - 4 to form a line in the central portion of the cutting die 13. In this embodiment, the processed sheet P is a polarizing plate, and the absorption axis of the polarizing plate to be cut is inclined by 45 degrees, so that the angle of each Thomson knife 11 can be designed, and the angle is Need to be appropriate to change. Further, in this embodiment, the air tube 35 is inserted into the four perforations 14a. The perforations 14a extend perpendicularly from the back surface of the cutting die 13 to the front surface thereof, and thus to the center of the hollow portion formed by the Thomson blade 11. Further, the perforations 14b are disposed in parallel with the feeding direction of the sheet P from the perforations 14a in parallel with the feeding distance corresponding thereto. Here, the feeding pitch is the sheet feeding distance for each cutting operation. Therefore, the sheets stamped by the previous cutting operations are vertically stacked below the perforations 14b. Further, a groove portion 15 for accommodating the air tube 35 therein is disposed on the back surface of the cutting die 13. Each of the perforations 14a, 14b extends to a side portion of the cutting die 13, wherein each groove portion 15 has a depth and width slightly larger than the outer diameter of each of the air tubes 35. Here, as shown in FIG. 3A and FIG. 3B, a notch 1 2 is preliminarily provided on the Thomson blade 1 1 and is located at the position of each groove portion 15 across its corresponding Tom 15 312XP/invented. Instruction manual (supplement) /94-04/93139995 1270449 Mori knife 1 1. The reason is as follows, that is, as shown in Fig. 3A, the groove portion 15 cannot be formed at the position where the Thomson blade 11 which is engaged with the cutting die 13 touches the back surface of the cutting die 13. Therefore, a U-shaped notch 12 is cut into the back of the Thomson blade 1 1 which is engaged with the position where the groove portion 15 is formed. Therefore, the interference of the Thomson blade 1 1 by the groove portion 15 can be prevented. In this manner, eight air tubes 35 are placed in the recessed portions 14a and 14b and in the recessed portion 15 in the back surface of the cutting die 13. The air tubes 35 inserted in the perforations 14a and 14b are engaged with the gas supply ports 37a and 37b to communicate with each other. On the other hand, the flow regulating valve 34 and the electromagnetic opening and closing valve 3 3 are provided on the other end side of each of the air tubes 35, but are not shown in Fig. 2. In the present embodiment, a plywood having a thickness of 18 mm was used as the cutting die 13, and a tube having an outer diameter of 6 mm was used as each of the air tubes 35. The notch formed in the back of each Thomson knife 1 1 is 2 mm wide. Therefore, since the arrangement of the respective air tubes 35 does not need to provide space accommodation separately, for example, the thickness of the cutting die 13 does not need to be increased, the movable platform 17 can be free from interference from the air tubes 35. Next, the operation of the sheet cutting device according to the present embodiment will be described with reference to Figs. 4 and 5. Fig. 4 and Fig. 5 are vertical sectional views showing a main part of the sheet cutting device at the time of cutting in the embodiment. The sheet P is conveyed by an unillustrated sheet conveying mechanism, and a portion to be cut is accurately placed opposite to the Thomson blade 11. At this time, the piece P1 which was cut at the last cutting action has been placed between the cutting die 1 3 16 312XP/invention specification (supplement)/94-〇4/93139995 1270449 and the load stage 2. Next, a series of cutting actions will be performed, which will be explained below. First, as shown in FIG. 4, the movable platform 17 is driven by an undisplayed crank mechanism, and is moved down to the sheet P supported on the load table 2, at this time, each Thomson knife 1 and the movable die 1 3 also moves with the movable platform 17. The cutting edge of the Thomson knife 1 1 first touches the sheet P, and then the Thomson knife 1 1 immediately cuts the sheet P to punch the sheet P. When the movable platform 17 is moved down to a predetermined position, the movable platform 17 is no longer moved downward. The position detecting sensor outputs a signal to the control element 4 when the position detecting sensor not shown by one of the Thomson knives 1 detects that the movable platform 17 is no longer moving downward. When the signal sent from the position detecting sensor enters the control element 4, the control element 4 turns the electromagnetic switching valve 3 3 open. Incidentally, the opening of the flow adjustment width can be adjusted to an appropriate value based on the results of experiments and the like. The compressed air supplied from the gas supply source 31 is sent to the gas supply port 3 via the air pipe 35, so that the compressed air is sent to the space between the cutting die 13 and the load table 2, as shown by the dotted line in FIG. Pointed by the arrow. That is, the control portion 4 operates and controls the electromagnetic switch width 3 3 to start supplying the gas after the Thomson knife 1 1 is moved downward and before moving upward, so the gas supply portion 3 starts supplying at this time. gas. The control section 4 closes the electromagnetic switch 3 3 after a predetermined time has elapsed, and the supply of compressed gas to gas supply 埠 3 7 a and 3 7 b is supplied by 17 312 XP / invention manual (supplement) /94-04/93139995 1270449 The action stops. In the present embodiment, the compressed gas is set to stop after 0. 5 seconds, wherein the setting and selection of the supply time, supply stop time, and supply rate of the compressed air are based on experimental results. On the other hand, the movable platform 17 starts moving up by the crank mechanism not shown after the downward movement is stopped, at which time the Thomson blade 1 moves up with the movable platform 17. At this time, the compressed air has been sent to the space between the cutting die 13 and the load stage 2. Therefore, even when the movable platform 17 moves upward, there is no negative pressure in the space. Therefore, gas does not flow into the space from the surroundings. Further, a pressure is applied to the sheets P0 and P1 by the delivery of the compressed air. Therefore, the sheets P0 and P1 can be prevented from floating upward, and therefore the cutting method can be appropriately performed. When the movable platform 17 returns to its starting position and stops the upper movement, the series of cutting operations is ended. The sheet P provided on the load table 2 is again supported by a sheet conveying mechanism not shown, and the support portion makes a portion of the material to be cut P facing the Thomson blade 11. The next cutting action is performed in the same manner as the aforementioned cutting method. The content of the present invention is not limited to the foregoing embodiments, and is also exemplified by the modified embodiments described hereinafter. (Embodiment 2) Although it has been explained in Embodiment 1 that a gas supply port 3 7 a, 3 7 b is provided at a position surrounded by each Thomson blade 11, the present invention is not limited to this 18 312 XP. / Invention Manual (supplement) /94-04/93139995 1270449 Composition. That is, if compressed air can be supplied to the space between the cutting die 13 and the load table 2, only the gas supply 埠3 7 b can be supplied. Alternatively, the gas supply ports 37 7 a and 3 7 b may be uniformly disposed on the front surface of the cutting die 13 . Further, the gas supply port 373 can be provided on the peripheral portion of the cutting die 13, so that the end portion of the sheet can be prevented from being slap. (Embodiment 3) The shape of each of the gas supplies 埠3 7 a, 3 7 b in Embodiment 2 may be changed to irradiate the compressed air to the radiation. Further, the opening area of each of the gas supply ports 37a, 37b can be enlarged to spray the compressed air over a larger range. The shape of each of the perforations 14 a, 14 b is also moderately changed according to the shape or direction of each air supply 埠 3 7 a, 3 7 b. For example, the perforations 14a, 14b can be set to be inclined and at an angle to the surface of the cutting die 13. (Embodiment 4) Although the above embodiment shows that the supply of compressed gas starts from the downward movement of the movable platform 17 and just before moving upward, the present invention is not limited thereto. For example, the supply of compressed air may begin as soon as the sheet P is cut or the Thomson knife 1 1 touches the lower sheet 21. At this time, the control portion 4 of the present embodiment and the position detecting sensor not shown can be appropriately changed or changed.
或者，經壓縮空氣之供應亦可始於片體P 0往上浮起時， 因此經壓縮空氣可僅在片體P 0需往下掉落之時進行。在偵 測片材P是否往上浮起的方法中，偵測之依據可為片材P 19 312XP/發明說明書(補件)/94-04/93139995 1270449 往上浮起之高度或位置，或亦可依據片材p已離開負載台 2之時間而為。 再者，經壓縮空氣可在一切割動作期間連續供應。故控 制部分4可不加提供。 (實施例5 ) 本說明書亦揭露下列不同實施例。亦即，使切割沖模1 3 及負載台2間之空間與周圍空氣相通之開口可設於切割沖 模1 3及可移動平台1 7之間。故，可防止切割沖模1 3及負 載台2間的空間存有負壓，即便短時間區間内亦然，此乃 因切割沖模1 3及可移動平台1 7間的往上位移所致。 開口是否位於湯姆森刀1 1形成之中空部分對於負壓之 避免全無關係。故，該等開口得設於湯姆森刀1 1形成之中 空部分或該中空部分的外部。 或者，開口亦可設於負載台2及下層片21中，或亦可設 於負載台2等及切割沖模1 3等之中。 對於此一構成，片材P不會往上浮起。再者，可不加提 供氣體供應部分3及控制部分4。此外，不需於切割沖模 13中形成穿孔14及凹槽部分15，或不需於湯姆森刀11之 預定背側位置上設置槽口 1 2。 根據本發明，經壓縮空氣係於切割動作進行之時被提供 至切割沖模及負載台間的空間中。故，可防止該空間存有 負壓，同時可防止空氣自周圍環境流入該空間。因此，自 片材中衝壓之片體不會自負載台往上浮起。因此，在片體 可不往上浮起或即便浮起亦不會掉落至片體被切割出之處 20 312XP/發明說明書(補件)/94-04/93139995 1270449 的條件下仍得維持量產能力。因此，該種片材切割方法得 以適當地進行。 本發明已針對特定實施例詳述如上，但熟習該項技術者 得在不悖離本發明之精神及範圍的條件下，對本發明加以 改變或更動，該等改變或更動仍不脫離本發明之範圍，本 發明之精神及範圍將定義如下述之申請專利範圍中。 本申請案係以2 0 0 3年1 2月2 4日提申之日本專利申請 案2003-42 7 450為基礎，及該案之内容以參考形式併於本 文中。 【圖式簡單說明】 圖1為本發明之一實施例片材切割裝置的示意圖。 圖2為本發明之一切割沖模自其後部所視之平面圖。 圖3A為自圖2中箭頭A-A所截得之該切割沖模的垂直剖 面圖。 圖3B為自圖2中箭頭A-A所截得只顯示切割刀的前視 圖。 圖4為該片材切割裝置之一主要部分在切割進行時的垂 直剖面圖。 圖5為該片材切割裝置之該主要部分在切割進行時的垂 直視圖。 圖6為習知片材切割裝置之一主要部分在切割進行之時 的垂直剖面圖。 【主要元件符號說明】 1 可移動切割部分 21 312XP/發明說明書(補件)/94-〇4/93139995 1270449 2 負 載 台 3 氣 體 供 應 部分 4 控 制 元 件 11 湯 姆 森 刀 12 槽 〇 13 切 割 沖 模 14 穿 孔 14a 穿 孔 14b 穿 孔 15 凹 槽 部 分 17 可 移 動 平 台 21 下 層 片 31 氣 體 供 應 源 32 散 霧 器 33 電 磁 開 關 閥 34 流 動 調 即 閥 35 空 氣 管 37a 氣 體 供 應 埠 37b 氣 體 供 應 埠 51 湯 姆 森 刀 53 切 割 沖 模 55 可 移 動 平 台 57 負 載 台 59 下 層 片 (片） 312XP/發明說明書(補件)/94-04/93139995 22Alternatively, the supply of compressed air may also begin when the sheet P0 floats upward, so that the compressed air may be performed only when the sheet P0 needs to be dropped downward. In the method of detecting whether the sheet P is floating upward, the detection may be based on the height or position of the sheet P 19 312XP / invention manual (supplement) /94-04/93139995 1270449, or may Depending on the time when the sheet p has left the load stage 2. Furthermore, the compressed air can be continuously supplied during a cutting operation. Therefore, the control section 4 can be omitted. (Embodiment 5) The present specification also discloses the following different embodiments. That is, an opening that allows the space between the cutting die 13 and the load table 2 to communicate with the surrounding air may be provided between the cutting die 13 and the movable platform 17. Therefore, it is possible to prevent a negative pressure in the space between the cutting die 13 and the negative stage 2, even in a short time interval, which is caused by the upward displacement between the cutting die 13 and the movable platform 17. Whether the opening is located in the hollow part formed by the Thomson knife 1 1 is completely irrelevant for the negative pressure. Therefore, the openings are provided in the hollow portion of the Thomson blade 1 or the outside of the hollow portion. Alternatively, the opening may be provided in the load stage 2 and the lower layer sheet 21, or may be provided in the load stage 2 or the like and the cutting die 13 or the like. With this configuration, the sheet P does not float upward. Further, the gas supply portion 3 and the control portion 4 may not be provided. Further, it is not necessary to form the perforations 14 and the groove portions 15 in the cutting die 13, or it is not necessary to provide the notches 1 2 at the predetermined back side position of the Thomson blade 11. According to the present invention, the compressed air is supplied to the space between the cutting die and the load table at the time of the cutting operation. Therefore, it is possible to prevent negative pressure in the space and prevent air from flowing into the space from the surrounding environment. Therefore, the sheet stamped from the sheet does not float upward from the load table. Therefore, the sheet body may not float upward or will not fall until the sheet is cut. 20 312XP / invention manual (supplement) /94-04/93139995 1270449 still have to maintain mass production ability. Therefore, this sheet cutting method is suitably carried out. The present invention has been described in detail above with respect to the specific embodiments thereof, and the invention may be modified or modified without departing from the spirit and scope of the invention. The spirit and scope of the present invention will be defined in the scope of the claims below. The present application is based on Japanese Patent Application No. 2003-42 7450, filed on Jan. 24, 2003, and the content of which is hereby incorporated by reference. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view of a sheet cutting device according to an embodiment of the present invention. Figure 2 is a plan view of a cutting die of the present invention as viewed from the rear. Fig. 3A is a vertical sectional view of the cutting die taken from the arrow A-A in Fig. 2. Fig. 3B is a front view showing only the cutting blade as viewed from the arrow A-A in Fig. 2. Fig. 4 is a vertical sectional view showing a main portion of the sheet cutting device as it is being cut. Fig. 5 is a vertical view of the main portion of the sheet cutting device as it is being cut. Fig. 6 is a vertical sectional view showing a main portion of a conventional sheet cutting device at the time of cutting. [Main component symbol description] 1 Movable cutting part 21 312XP/Invention manual (supplement)/94-〇4/93139995 1270449 2 Load stage 3 Gas supply part 4 Control element 11 Thomson knife 12 Groove 13 Cutting die 14 Perforation 14a Perforation 14b Perforation 15 Groove portion 17 Movable platform 21 Lower ply 31 Gas supply source 32 Litter 33 Electromagnetic switching valve 34 Flow regulating valve 35 Air pipe 37a Gas supply 埠 37b Gas supply 埠 51 Thomson knives 53 Cutting dies 55 Movable platform 57 Load station 59 Lower layer (piece) 312XP/Invention manual (supplement)/94-04/93139995 22