200524720 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（punch)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 2002-11697 A 312XP/發明說明書(補件)/94-04/93139995 200524720 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5 1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P0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P 0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 200524720 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 及一負载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 200524720 氣係供應於該片體往上浮起至距該負載台一預定高度或浮 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，具有一切 割刀，該切割刀置於一切割沖模中，並切割一設於該負載 台上之一片材，以自該片材中衝壓一片體；一負載台，固 設於一與該切割刀相對之位置上；及一氣體供應元件，用 以供應經壓縮之氣體至該切割刀及該負載台間之空間中， 且供應之時為該切割動作之起始至終結期間的至少一時間 點。 (7 )如第（6 )項所述之片材之切割裝置，其中該氣體供應 元件包含：一氣體供應埠，用以供應經壓縮空氣至該空間 中；及一氣體供應導管，與該氣體供應埠相接，其中，該 氣體供應埠設於該切割沖模中，且該氣體供應導管設置成 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：切割一設於 一負載台上之一片材，藉由一切割刀切割之，其中該切割 刀固接至一切割沖模，以自該片材上衝壓一片體；及用以 防止成避免一相對於周圍空氣為負壓之壓力在一切割動作 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，其中該防止或避免步 驟包含下列步驟：藉由預先在該切割沖模或該負載台中提 供一開口以使該空間與該空氣相通而允許空氣進入該空 間。 根據第（1 )項之實施例，由於經壓縮空氣在該切割刀切割 312XP/發明說明書(補件)/94-04/93139995 200524720 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 200524720 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 200524720 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 200524720 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11、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 200524720 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因此設於該負载台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 氣加以喷灑，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 200524720 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3A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 200524720 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 200524720 森刀1 1。 其理由如下，亦即，如圖3A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15的干擾。 以此一方式，八個空氣管3 5納置於穿孔1 4 a及1 4 b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 8 in m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11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)/94-04/93139995 200524720 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；i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1 7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 調節閥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對電磁開關閥33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閥3 3，接 17 312XP/發明說明書(補件)/94-04/93139995 200524720 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P 0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片材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 200524720 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噴灑。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14a、14b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。200524720 IX. Description of the invention: [Technical field to which the invention belongs] The present invention relates to a method and a device for cutting a sheet, and more particularly to a sheet for cutting a predetermined shape of a sheet in the sheet. technology. [Prior art] For cutting of sheet materials, there are known techniques for cutting or punching the sheet materials using a cutter, a laser, and the like. Among them, the stamping technology using Thomson's die has advantages in processing speed or processing cost, and is therefore widely used (see reference 1). Here, examples of the sheet include a polarizing plate or a retardation plate, a retardation film, a reflection plate, and other conventional optical sheets. A strip-shaped Thomson knife is generally used as a cutting knife for stamping. The stamping shape refers to a shape in which the cutting edge of the cutting knife is formed into a ring, which can be not only rectangular or round, but also expected. Regular shape, depending on its application. On the other hand, a groove having a punch shape is formed in a dressing die, and a cutting blade is fixed in the dressing die, and a Thomson knife is fixed in the groove. In this setting, the trimming die is called a "cutting die", but is no different from a known cutting die. As the cutting die moves up and down with the Thomson knife while the cutting is in progress, a piece of material placed on a load table accepts the cutting action, so that the Thomson knife is punched. (Reference Document 1) JP 2002-11697 A 312XP / Invention Specification (Supplement) / 94-04 / 93139995 200524720 However, when the Thomson knife cuts the sheet down and then moves up, the cut sheet ( (Chip body) can float up from the load table, this state will be explained below with reference to FIG. 6. FIG. 6 is a vertical sectional view of a conventional sheet cutting device during cutting, in which a Thomson knife 5 1 for cutting a sheet P is fixed in a cutting die 5 3, and the cutting die 5 3 is a movable The platform 5 5 is fixed on its back surface. The movable platform 5 5 is supported on a driving mechanism (not shown) for moving with the Thomson knife 5 1 and the cutting die 5 3. A load table 57 is fixed on the opposite side of the Thomson knife 51, a lower sheet 59 is provided on the upper surface of the load table 57, and a sheet P is provided on the lower sheet 59 so that it is cut by the Thomson knife 51. After the sheet P is cut, the sheet P is conveyed for a predetermined distance in the direction of the dotted arrow so that a portion to be cut is thereafter set at a position opposite to the Thomson knife. Fig. 6 shows a state in which the Thomson knife 5 1 is moved downward to cut the sheet P to punch a piece P 0 from the sheet P, and then moved upward again. At this time, the cutting sheet body P0 or P1 can fly up as shown in the figure. Incidentally, the pieces P 1 and P 2 in FIG. 6 are obtained by punching the last shot and the shot before the last shot respectively; when the piece P0 or others fly up, the piece P0 or other The person then left where he was before cutting so that the sheet body P 0 etc. can be cut again (so-called repeated stamping). At a point in the manufacturing process, when a piece leaves the place where it is cut, it becomes difficult to be properly processed in subsequent steps (such as the picking operation of the piece), at which point there is a loss. Furthermore, when the repeated pressing operation is performed, each of the main cutting steps cannot be properly performed. 6 312XP / Invention Specification (Supplement) / 94-04 / 93139995 200524720 The present invention was made in consideration of this situation, and its purpose is to propose a cutting method and device for sheet material to prevent a sheet body punched from sheet material. It will float, or even if it floats, it will fall close to the position where the sheet is cut. SUMMARY OF THE INVENTION The inventors of this case have completed intensive research to examine the above problems. As a result, it was understood that the sheet body floated up or dropped after being punched from the sheet due to an air flow between a cutting die and a load table. Furthermore, the inventor of the present case also learned 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 air flowing into the space from the surroundings due to the cutting die moving upward, The present invention is based on this finding. The main features of the present invention are listed as follows: (1) A method for cutting a sheet material, which includes the following steps: cutting a sheet material provided on a load table by a cutting blade, wherein the cutting blade is fixed Connected to a cutting die for punching a piece from the sheet; and supplying compressed air to the space between the cutting die and the load table, and the supply is from the beginning to the end of the cutting operation At least one point in time. (2) The method for cutting a sheet according to item (1), wherein the compressed air is supplied to the sheet body to apply a pressure to the sheet body. (3) The method for cutting a sheet according to item (1) or (2), wherein the supply of the compressed air starts when the sheet is cut by the cutter. (4) The method for cutting a sheet according to item (1) or (2), wherein the sheet is cut by moving the cutting knife up and down, and the compressed air is initially supplied to move down the cutting knife After and just before moving up. (5) The cutting method of the sheet according to item (1) or (2), wherein the compressed air 7 312XP / Invention Specification (Supplement) / 94-04 / 93139995 200524720 The air system is supplied to the sheet body to float upward Lifting is performed after a predetermined height from the load platform or after floating for a predetermined time. (6) A cutting device for a sheet material, which includes a cutting element having a cutting blade, the cutting blade is placed in a cutting die, and a piece of material provided on the load table is cut from the piece A piece of material is punched in the material; a load table is fixed at a position opposite to the cutting blade; and a gas supply element for supplying compressed gas to a space between the cutting blade and the load table, and The time of supply is at least one point in time from the beginning to the end of the cutting operation. (7) The cutting device for a sheet material according to item (6), wherein the gas supply element includes: a gas supply port for supplying compressed air into the space; and a gas supply duct and the gas The supply port is connected, wherein the gas supply port is provided in the cutting die, and the gas supply pipe is arranged to be received in a groove portion of the cutting die. (8) A method for cutting a sheet material, which includes the following steps: cutting a sheet material provided on a load table, and cutting it with a cutting blade, wherein the cutting blade is fixed to a cutting die, and A piece of body is punched on the sheet; and to prevent a negative pressure relative to the surrounding air from being generated in a cutting action in a space between the cutting die and the load table. (9) The method for cutting a sheet according to item (8), wherein the preventing or avoiding step includes the following steps: Allowing the space to communicate with the air by providing an opening in the cutting die or the load table in advance Air enters the space. According to the embodiment of item (1), at least one point in time when a piece of material is punched out of a piece of material by means of compressed air at the cutting blade 312XP / Invention Specification (Supplement) / 94-04 / 93139995 200524720 It is supplied into the space between the cutting die and the load table. Therefore, it is possible to prevent the space from having a negative pressure with respect to the surrounding environment, even when the cutting blade is moved upward. Therefore, air can be prevented from flowing into the load table from the surrounding environment. Therefore, no air flow is generated on the load table, so the sheet body punched from the sheet material does not float from the load table. Incidentally, the cutting time in the present invention includes a time period during the start and end of the cutting action. For example, when the cutting blade moves up or down, the cutting time means that the cutting blade moves from a predetermined position down to the cutting blade and then moves up again to return to the predetermined position. In addition, it is preferable to supply the compressed gas after the sheet body is punched from the sheet for the cutting blade and immediately before the cutting blade is moved upward during the period of time. Furthermore, as described in the embodiment of item (5), the present invention includes the following embodiments: The supply of the gas is when the cutting blade body floats up to a predetermined height from the load table or rises for a predetermined time. At that time. As a result, when the sheet is lifted from the load table, the compressed air can be supplied at a predetermined position or can be supplied at a predetermined time to drop the sheet close to the position where it is cut. Incidentally, in each of the above embodiments, since the processing speed does not need to be reduced to supply compressed air to the space between the cutting die and the load table, its mass production capacity can be maintained. Therefore, according to the present invention, the mass production capacity is such that the sheet punched from the sheet does not float or even falls, it will fall close to the position where the sheet is cut 312XP / Invention Manual (Supplement) / 94 -04/93139995 200524720. Therefore, the sheet cutting process is appropriately 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, other conventional optical sheets or films, or a sheet of paper or cloth, and the “sheet body "Specially used to refer to the part of the sheet that was stamped. In the embodiment corresponding to item (2), in addition to the sheet cut out of the current punching action, the sheet cut out by the previous punching action also appears in the space between the cutting die and the load table. Each of these pieces is liable to fly up due to the influence of air flow. According to the embodiment of item (2), the compressed air is supplied to the space at the sheets at the time of cutting. Therefore, a negative pressure can be prevented from being stored in the space, so the generation of an air flow can be suppressed. In addition, a pressure is directly applied to each sheet body, so the sheet body can be prevented from flying up. 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 action direction is opposite to the downward moving direction of the cutting die. In the embodiment according to item (3), the downward movement of the cutting blade is completed before the sheet is cut by the cutting blade, so the cutting operation is not disturbed by the supply of compressed air. Furthermore, when compressed air is supplied when the sheet is cut, 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 sent to a hollow portion formed by the cutter, the following operation is performed. When the sheet has been cut by a cutter, the supply of compressed air does not affect the cutting action performed in the same way. In addition, the sooner the pressure is applied to the cut sheet, the more the sheet is lifted from the load table to be suppressed. Therefore, when the sheet is cut by a cutting knife, compressed air will be sent in after 10 312XP / Invention Manual (Supplement) / 94-04 / 93139995 200524720, so the pressure can be effectively applied to the sheet earlier. . According to the embodiment of item (4), during the upward and downward movement, the cutting blade is located at the lowest position after the downward movement and immediately before the upward movement, and the sheet material has been cut before this time. Therefore, when the 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 stored in the early stage without negative pressure. According to the embodiment of item (6), the space between the cutting die and the load table can be prevented from having a negative pressure relative to the surrounding environment, even when the cutting blade moves upward, so the air can not escape from the surroundings. The environment flows onto the load table. Therefore, no air flow is generated on the load table, and the punched sheet in the sheet does not float upward from the load table. According to the embodiment of item (7), the compressed air can be sent down vertically from the gas supply port in the cutting die. Therefore, a pressure can be directly applied to the sheet body. In addition, the gas supply duct is housed in a groove in the cutting die. Therefore, there will be no interference between the gas supply duct and any other parts. 'According to the embodiment of the item (8), it is possible to prevent a negative pressure from being stored 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 upwards or even when the sheet floats, it will fall close to the position where it is cut. The space between the cutting die and the load table was originally open to outside air. However, the space can temporarily be under-pressurized. According to the embodiment of item (9), the space between the cutting die and the load table is designed to be more open to the outside air. 11 312XP / Invention Specification (Supplement) / 94 · 04/93139995 200524720, so that it can be prevented Space has 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 it does not mean that the present invention is limited to those described below. (Embodiment 1) FIG. 1 is a schematic diagram of an embodiment of a sheet cutting device according to the present invention. The sheet cutting device according to this embodiment has a movable cutting section 1 and a load table 2, a gas supply section 3, and a control element 4, wherein the movable cutting section 1 and the load table 2 are used to cut a sheet Material P, the control element 4 is used to supply compressed air while cutting is in progress. In the present invention, the movable cutting portion 1 corresponds to a cutting element, and the gas supply portion 3 corresponds to a gas supply element. The movable cutting part 1 has a Thomson knife 11, a cutting die 13, and a movable platform 17, wherein the Thomson knife 11 is used to cut the sheet P, and the cutting die 13 is used to fix the Tom Mori 11 and the movable platform 17 are used to fix the cutting die 13 on the back surface side. The movable platform 17 is supported by a crank mechanism (not shown). When the cutting action is performed, the movable platform 17 is moved up and down due to the driving force transmitted from the crank mechanism. At this time, the Thomson knife 11 and the cutting die 13 are also moved up and down together 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 up and down is suitable as the driving source, such as a cylinder mechanism. 12 312XP / Invention Specification (Supplement) / 94-04 / 93139995 200524720 Incidentally, Thomson knife 11 corresponds to the cutting knife of the present invention. In the description of this specification, the surface provided with the cutting die 13 is the “front surface” of the cutting die 13 and the cutting die 13 is supported on a movable platform 17 The surface is called the "back surface" of the cutting die 1 3. The load table 2 is fixedly disposed below the movable cutting part 1. In order to prevent the Thomson knife 11 from colliding with the load table 2 and being damaged during the cutting operation, the lower sheet 21 is therefore provided on the load table. 2 on the top surface. In this embodiment, the lower layer sheet 21 is made of a polyethylene terephthalate (PET) material. PET has appropriate hardness as a lower layer, high durability, and less foreign matter generation, among which the low foreign matter generation is even when the Thomson knife 11 erodes it. The gas supply part 3 is used to spray the compressed air supplied by the gas supply source 31, wherein the gas supply ports 3 7a and 3 7 b are provided in the cutting die 1 3, and the gas supply source 3 1 has a For the compressor shown, the compressed air is sent out there. One end of each of the air pipes 35 is connected to the gas supply source 31 provided as described above, so as to allow the two to communicate with each other. Each of the air pipes 3 5 is introduced into the cutting die 1 3 and the groove portion 15 through a mist diffuser 3 2, an electromagnetic switch valve 3 3 and a flow regulating valve 3 4. An air pipe 35 is provided, and the air pipe 35 is inserted into the perforation 14, and the perforations 14 are formed in the cutting die 13. The gas supply ports 37a and 37b communicating with the air pipe 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 compressed 13 312XP / Invention Specification (Supplement) / 94-04 / 93139995 200524720 air. 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 particles and oil components contained in the compressed air can be eliminated, so that clean air can be supplied. Incidentally, the air pipe 35 corresponds to a gas supply pipe in the present invention. The control element 4 receives a detection signal from a position detection sensor of the Thomson knife 11 not shown, and operates the aforementioned electromagnetic switch valve 3 3 according to the position of the Thomson knife 11 to control the compressed The supply of air is clocked into the movable cutting section 1. In addition, the control element 4 can also control the operation of the flow regulating valve 34. Furthermore, the device according to this embodiment has a sheet feeding mechanism not shown, 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 device is composed of a spool or the like that supports the roll in a rotatable manner, so that the sheet P can Placed and sent. In addition, the device according to this embodiment has a sheet conveying mechanism not shown, and the sheet P is conveyed to the load table 2 by the sheet conveying mechanism, and each cutting action falls a predetermined distance from Into the pitch, the sheet P to be cut is placed in a relative position with the Thomson knife 11. The movable cutting section 1 and the gas supply section 3 will be described in detail below. Fig. 2 is a plan view of the cutting die according to this embodiment viewed from the back, Fig. 3A is a vertical sectional view of the cutting die taken from arrow A-A of Fig. 2, and Fig. 3B is a front view showing only the cutting blade. 14 312XP / Invention Manual (Supplement) / 94-04 / 93139995 200524720 Cutting die 1 3 is made of rectangular plywood, in which the groove is formed into a shape that can be punched. In this embodiment, the shape can be punched. Is rectangular. Each of the Thomson blades 11 formed in a rectangular shape is engaged with the groove and fixed. In this embodiment, four rectangular Thomson knives 11 are set in a cutting die 13. The shape of each Thomson knife 11 is not limited to a rectangle, and it can also be circular, polygonal, or other irregular. Each Thomson knife 11 is set to face a direction that is 45 degrees from the side of the cutting die 1 3 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 the angle of each Thomson knife 11 can be designed by the designer, and the angle Need to be able to add appropriate changes. Moreover, in this embodiment, the air pipe 35 is inserted into the four perforations 1 4 a. The perforations 1 4 a 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 knife 11. In addition, the perforations 14b from the conveying direction of the sheet P are arranged at the replacement positions in parallel with the feeding distance corresponding to the perforations 14a. Here, the feeding pitch is the sheet feeding distance for each cutting operation. Therefore, the sheet punched by the previous several cutting operations will be vertically stacked under the perforation 14b. Further, a groove portion 15 for allowing the air pipe 35 to be well engaged therein is provided on the back surface of the cutting die 13. Each of the perforations 14 a, 1 4 b extends to a side portion of the cutting die 13, wherein the depth and width of each groove portion 15 are slightly larger than the outer diameter of each air pipe 35. Here, as shown in FIG. 3A and FIG. 3B, a notch 12 is set on the Thomson knife 11 in advance and straddles its corresponding Tom 15 312XP / invention at the position of each groove portion 15 Manual (Supplement) / 94-04 / 93139995 200524720 Mori knife 1 1. The reason is as follows, that is, as shown in FIG. 3A, the groove portion 15 cannot be formed at a position where the Thomson knife 11 engaged with the cutting die 13 contacts the back surface of the cutting die 13. Therefore, a U-shaped notch 12 is cut on the back of the Thomson knife 1 1 which is engaged at the position where the groove portion 15 is formed. Therefore, interference of the Thomson knife 11 with the recessed portion 15 can be prevented. In this way, eight air tubes 35 are housed in the recessed portions 15 in the back surface of the perforations 1 4 a and 1 4 b and the cutting die 13. The air pipes 35 inserted in the perforations 14a and 14b are joined to the gas supply ports 37a and 37b so as to communicate with each other. On the other hand, a flow regulating valve 34 and a solenoid switching valve 3 3 are provided on the other end side of each air pipe 35, but they are not shown in FIG. In this embodiment, a plywood with a thickness of 18 in m is used as the cutting die 13, and a tube having an outer diameter of 6 mm is used as each air tube 35. The notches 12 formed in the back of each Thomson knife 11 are 8 mm wide. Therefore, due to the arrangement of the air pipes 35, it is not necessary to provide space for accommodation, for example, the thickness of the cutting die 13 does not need to be increased, so the movable platform 17 can not be interfered by the air pipes 35. Next, the operation of the sheet cutting device according to this embodiment will be described with reference to Figs. 4 and 5. 4 and 5 are vertical cross-sectional views of a main part of the sheet cutting device when cutting is performed in this embodiment. The sheet P is conveyed by a not-shown sheet conveying mechanism, and a portion to be cut is accurately placed opposite to the Thomson knife 11. At this time, the piece P1 that was cut out during the last cutting action has been placed between the cutting die 1 3 16 312XP / Invention Specification (Supplement) / 94-04 / 93139995 200524720 and the load table 2. Next, a series of cutting actions will be performed, which will be described below. First, as shown in FIG. 4, the movable platform 17 is driven by a crank mechanism (not shown). In the past, it moved to the sheet P supported on the load table 2. At this time, each Thomson knife 1 1 and the movable die 1 3 also moves with the movable platform 17. The cutting edge of the Thomson knife 11 is touched first; i the material 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. When one of the undetected position detection sensors on the Thomson knife 1 1 detects that the movable platform 17 is no longer moving downward, the position detection sensor outputs a signal to the control element 4. When the signal sent from the position detection sensor enters the control element 4, the control element 4 opens the electromagnetic on-off valve 33. Incidentally, the opening of the flow regulating valve 34 can be adjusted to an appropriate value in advance based on the results of experiments and the like. The compressed air provided by the gas supply source 31 is sent to the gas supply port 37 through the air pipe 35, so 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 section 4 operates and controls the electromagnetic switch valve 33 to start supplying the gas after the Thomson knife 11 is moved down and immediately before the upward movement is to be performed, so the gas supply section 3 starts to supply gas at this time. . The control part 4 closes the electromagnetic switch valve 3 3 after a predetermined time, and then supplies 17 312XP / Invention Specification (Supplement) / 94-04 / 93139995 200524720 to supply compressed gas to the gas supply ports 3 7 a and 3 7 b. The motion stops. In this embodiment, the compressed gas is set to stop after 0.5 seconds, and the setting and selection of the supply time, supply stop time, and supply rate of compressed air are based on experimental results. On the other hand, the movable platform 17 starts to move upward by a crank mechanism (not shown) after the downward movement stops, at this time, the Thomson knife 11 and the movable platform 17 move upward together. At this time, the compressed air has been sent to the space between the cutting die 13 and the load table 2. Therefore, even when the movable platform 17 is moved upward, there is no negative pressure in the space. Therefore, the gas does not flow into the space from the surroundings. Furthermore, a pressure is applied to the sheets P0 and P1 due to the introduction of the compressed air. Therefore, it is possible to prevent the sheet bodies P 0 and P1 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 upward movement, the series of cutting operations is ended. The sheet P set on the load table 2 is supported again by a sheet conveying mechanism not shown, and the support portion makes a part of the sheet P to be cut face the Thomson knife 11. The next cutting operation 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 it can also be modified as described later. (Embodiment 2) Although it has been described in Embodiment 1 that a gas supply port 3 7 a, 3 7 b is provided at a position surrounded by each Thomson knife 11, the present invention is not limited to this one 18 312XP / Invention Specification (Supplement) / 94-04 / 93139995 200524720. That is, if the compressed air can be supplied into the space between the cutting die 13 and the load table 2, only the gas supply port 3 7b can be provided. Alternatively, the gas supply ports 3 7 a and 3 7 b may be evenly disposed on the front surface of the cutting die 1 3. Furthermore, the gas supply port 37 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 beaten. (Embodiment 3) The shape of each of the gas supply ports 37a, 37b in Embodiment 2 may be changed to spray the compressed air with radiation. Furthermore, the open area of each of the gas supply ports 37a, 37b can be enlarged to spray compressed air over a larger area. The shape of each of the perforations 14a and 14b also changes appropriately depending on the shape or direction of each of the air supply ports 37a and 37b. For example, the perforations 1 4 a and 1 4 b can be set to be inclined and angled with the surface of the cutting die 13. (Embodiment 4) Although the above-mentioned embodiment shows that the supply of compressed gas is started after the movable platform 17 is moved downward and immediately before it is intended to be moved upward, the present invention is not limited to this. 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 section 4 and the position detection sensor not shown in this embodiment can be appropriately modified and 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-(M/93139995 200524720 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 200524720 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曰提申之日本專利申請 案2003-427450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3 A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)/94-04/93139995 200524720 2 負 載 台 3 氣 體 供 應 部分 4 控 制 元 件 11 湯 姆 森 刀 12 槽 口 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 節 閥 35 空 氣 管 37a 氣 體 供 應 埠 37b 氣 體 供 應 埠 51 湯 Llfl 森 刀 53 切 割 沖 模 55 可 移 動 平 台 57 負 載 台 59 下 層 片 (> Ϊ ) 312XP/發明說明書(補件)/94-04/93139995Alternatively, the supply of compressed air can also start when the sheet body P 0 floats upward, so the compressed air can be performed only when the sheet body P 0 needs to fall down. In the method of detecting whether the sheet P floats upward, the basis of detection may be the height or position of the sheet P 19 312XP / Invention Specification (Supplement) / 94- (M / 93139995 200524720 upward, or It can be based on the time when the sheet p has left the load table 2. Furthermore, the compressed air can be continuously supplied during a cutting operation. Therefore, the control part 4 may not be provided. (Embodiment 5) This specification also discloses the following different implementations That is, an opening that communicates the space between the cutting die 13 and the load table 2 with the surrounding air can be provided between the cutting die 13 and the movable platform 17. Therefore, the cutting die 13 and the load table can be prevented There is negative pressure in the space between 2 even in a short time interval, which is caused by the upward displacement between the cutting die 13 and the movable platform 17. Is the opening located in the hollow part formed by the Thomson knife 11? It has nothing to do with the avoidance of negative pressure. Therefore, these openings may be provided in the hollow portion formed by the Thomson knife 11 or the outside of the hollow portion. Alternatively, the openings may also be provided in the load table 2 and the lower sheet 21, or Can also be set on load table 2 etc. and cutting die 1 3 With this configuration, the sheet P does not float upward. Furthermore, the gas supply portion 3 and the control portion 4 may not be provided. In addition, the perforation 14 and the groove portion 15 need not be formed in the cutting die 13, Or it is not necessary to provide a notch 12 at a predetermined back side position of the Thomson knife 11. According to the present invention, the compressed air is provided to the space between the cutting die and the load table when the cutting operation is performed. 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 punched from the sheet will not float up from the load table. Therefore, the sheet body can not float up or even float. It will not fall to the place where the sheet is cut out 20 312XP / Invention Specification (Supplement) / 94-04 / 93139995 200524720 The mass production capacity is still maintained. Therefore, this sheet cutting method is appropriate The present invention has been described in detail above for specific embodiments, but those skilled in the art may make changes or changes to the present invention without departing from the spirit and scope of the present invention, and such changes or changes still do not depart from this The scope of the invention, the spirit and scope of the present invention will be defined as in the following patent application scope. This application is based on Japanese Patent Application 2003-427450 filed on February 24, 2003, and The content of this case is incorporated by reference. [Brief Description of the Drawings] FIG. 1 is a schematic diagram of a sheet cutting device according to an embodiment of the present invention. FIG. 2 is a plan view of a cutting die of the present invention viewed from the rear Fig. 3 A is a vertical sectional view of the cutting die taken from arrows A-A in Fig. 2. Fig. 3B is a front view showing only the cutting blade taken from arrows AA in Fig. 2. Fig. 4 is the piece. A vertical cross-sectional view of a main part of a wood cutting device while cutting is in progress. Fig. 5 is a vertical view of the main part of the sheet cutting device while cutting is in progress. Fig. 6 is a vertical sectional view of a main part of a conventional sheet cutting device while cutting is in progress. [Description of Symbols of Main Components] 1 Movable cutting part 21 312XP / Invention Manual (Supplement) / 94-04 / 93139995 200524720 2 Load table 3 Gas supply part 4 Control element 11 Thomson knife 12 Notch 13 Cutting die 14 Perforation 14a Perforation 14b Perforation 15 Groove section 17 Movable platform 21 Lower layer sheet 31 Gas supply source 32 Diffuser 33 Solenoid switch valve 34 Flow regulating valve 35 Air pipe 37a Gas supply port 37b Gas supply port 51 Soup Llfl Mori knife 53 Cutting die 55 Movable platform 57 Load platform 59 Lower layer (> Ϊ) 312XP / Invention Manual (Supplement) / 94-04 / 93139995
22twenty two