8032-lTWP.doc-5/24 玖，纖_月 (發明說明應敘明：發明所屬之技術領域、先前技術、內容、實施方式及圖式簡單 說明） 【發明所屬之技術領域】 本發明係關於一種畫像形成裝置，特別是以使用中間體的 串列方式，能夠形成彩色畫面於紙等的媒體表面上之畫像形成 手段者。 【先前技術】 從先前在印刷機、列印機、複印機等畫像形成裝置中，有 依電子照相方式形成的彩色畫像。而依電子照相方式形成者， 係在膠版印刷等變成能夠成爲製版印刷的方式，及以同等畫質 或速度形成的畫像。依電子照相方式形成的畫像係稱之爲碳粉 式的粉體狀顯像劑，以顯像形成靜電的潛像。彩色畫像用的有 色碳粉係使用四種色相用的Y(黃色，yellow)、Μ(紫紅色’ magenta)、C(青綠色，cyan)及Κ(黑色，black)，由各個色 相的顯像劑所形成電子的畫像，係以重疊而獲得彩色畫像。 目前產業界形成電子照相方式的彩色畫像中，其主流技術 分爲四工程方式及串列方式，就四工程方式而言，係一工程， 即靜電潛像形成、顯像、轉寫及定像的YMCK之一色畫像後形成 在媒體表面，爲了反覆四次作爲彩色畫像之畫像，其成形速度 就變得遲慢。而以串列方式由顯像劑轉寫彩色畫像於媒體表面 後，施行定像，所以能使作爲彩色畫像的畫像成形速度快速。 200417827 8032-lTWP.doc-6/24 第5圖及第6圖係在串列方式中，分別表示依次由各色相顯 像劑依序堆疊畫像的方式，及於中間體由各色相顯像劑的堆疊 畫像後，以總括轉寫在媒體表面的方式。如第5圖所示，爲了 — 以電子照相方式形成彩色畫像的畫像形成裝置1、2、3、4，例 5如以CMYK的順序，沿著媒體的紙5搬運路徑5a的路徑配置。各 畫像形成裝置1、2、3、4對應於搬運路徑5a的部份，分別設置 轉寫裝置6、7、8、9，以將各色相顯像劑的畫像轉寫於紙5的 · 表面。由四色相顯像劑形成彩色畫像附在紙5的表面上，再搬 運至定像裝置10，由加熱及加壓至少融化顯像劑之一部份，以 10具有耐久性狀態形成彩色畫像附著在紙5的表面上。如第6圖所 示，由顯像劑所形成的彩色畫像，係以聚酉光亞胺等材質形成 的中間轉寫帶11表面，自四個畫像形成裝置1、2、3、4依次轉 寫顯像劑而形成，此間有彩色畫像顯像的顯像劑之形成，乃總 括轉寫在面臨中間轉寫帶11的旋轉路徑，面臨於搬運路徑5b 15的紙5表面而搬運到定向裝置時，在紙5表面定向。 對作爲大型的紙5者能夠形成圖像的裝置，搬運路徑5a、 * 5b係大槪的成水平方向。在使用中間轉寫帶11的串列方式，係 作成中間轉寫帶11之循環路徑大槪爲向垂直方向變長形狀，配 置畫像形成裝置1、2、3、4於上下方向，亦可以求節省設置空 20間（例如，參照專利文獻一：日本國特開2001 -331008號公報） 如第5圖及第6圖所示之依串列方式之彩畫像形成，係因連 續四工程由顯像劑執行畫像而形成，故有如下的問題： (1)在僅需要黑色的畫像時，CMY畫像形成裝置1、2、3， 在第5圖中係使其從紙5之搬運路徑5a中離開，在第6圖中係需 200417827 8032-lTWP.doc-7/24 要其從中間轉寫帶11中離開。爲了以電子照相方式形成畫像， 畫像形成裝置1、2、3、4需包含感光體，因而在黑色畫像形成 ^ 時，雖未使用CMY畫像形成裝置1、2、3之感光體，但其乃接觸 -於紙5或中間轉寫帶11，故由於此等磨損將會導致裝置之使用 5壽命縮短者。 (2)爲了以直列執行四工程，其從最初的畫像形成之第一 個印字爲止皆要花費一些時間。啓動後，連續的畫像形成所謂φ 的管路線（Pipe Line)方式效應，以一個畫像形成裝置1、2、 3、4，將畫像形成所要花費的時間，係以比較高的速度來施 10 fj。可是’緊接著啓動後初次的畫像形成，則需要以4個畫像 形成裝置1、2、3、4依次形成畫像的時間，變成需要連續的畫 像形成時之4倍時間。 在彩色畫像及黑白畫像形成之需求下，一般認爲黑白畫像 形成之需求方面較多’亦即預料黑白爲9〇%、彩色爲ι〇%者。如 此黑白畫像形成之需求多時，特別是要將彩色畫像形成用畫像 形成裝置1、2、3之感光體，作成爲不磨損的情況變成比較重修 要，但欲使3個畫像形成裝置1、2、3離開的機構會使之變成大 費周章者。又黑白畫像形成之需求多時，高速印字所需要的時 間’或連續的畫像形成所需要的時間，亦即在黑白畫像形成時 間縮短的必要性遠高於彩色畫像形成時間的縮短。 【發明內容】 本發明之目的即在於提供一種畫像形成裝置，其能夠形成 彩色畫像，而且黑色等單色畫像形成速度較彩色畫像爲快者。 8032-lTWP.doc-8/24 本發明係於一邊搬運單張狀之媒體，一邊形成畫像在該媒 體表面的畫像形成裝置上，其所採行之技術手段包括： 一顯像劑像載持體，循環於預先所設定的路徑，在外周面 以靜電的載持粉體狀顯像劑之畫像，該路徑之一部份係面臨於 媒體之搬運路徑，將載持顯像劑之畫像轉寫在媒體表面； 一第一畫像形成手段，配置在沿顯像劑像載持體外周面之 循環路徑，外周面上由粉體狀之顯形劑形成彩色畫像；及一第 二畫像形成手段，配置在沿媒體之搬運路徑，形成單色畫像於 該媒體表面。 依本發明畫像形成手段，爲了形成畫像在搬運的單張狀之 媒體表面，包括顯劑像載持體，第一畫像形成手段及第二畫像 形成手段。顯像劑像載持體係循環於預先所設定路徑，在外周 面以靜電的載持粉體狀顯像劑之畫像，設路徑的一部份面臨媒 體之搬運路徑，轉寫所載持顯像劑之畫像於媒體表面。第一畫 像形成手段配置在沿顯像劑像載持體外周面之循環路徑，因於 外周面上形成由粉體狀顯像劑彩色畫像，故在媒體表面。 於顯像劑像載持體外周面轉寫，依第一畫像形成手段所形 成由粉體狀顯像劑的彩色畫像。依第二畫像形成手段在媒體表 面亦形成單色畫像。動作顯像劑像載持體及第一畫像形成手 段，使媒體的搬運及第二畫像形成手段的動作同步時，則能重 疊形成由第一畫像形成手段裝置顯像劑之彩色畫像，及由第二 畫像形成手段的單色畫像在媒體表面上。欲形成單色畫像時， 因能停止顯像劑像載持體及第一畫像形成手段，所以能避免感 光體等之磨損能防止壽命的縮短。單色畫像係僅使媒體之搬運 200417827 8032-lTWP.doc-9/24 及第二畫像形成手段同步就成可能，故不需第一畫像形成手段 之動作，能縮短起動後至形成最初的畫像止所要時間。 又本發明特徵該第一畫像形成手段，將該彩色畫像之形成 由預先規定的複數色，顯像劑的畫像電子照相方式形成，由於 5依次轉寫在該像載持體外周面上來執行。 該第二畫像形成手段，係形成黑色畫像在該媒體表面，其 中更包括模式切換手段，係能夠切換爲彩色畫像形成模式，以 φ 預先規定的第一畫像形成速度，執行該像載持體的循環及第一 畫像形成手段的運轉，配合於第一畫像形成速度執行媒體的搬 10運速度及第二畫像形成手段的運轉；及黑白畫像形成模式，停 止像載持體的循環及第一畫像形成手段的運轉，以配合較快於 第一畫像形成速度的第二畫像形成速度，執行媒體的搬運速度 及第二畫像形成手段的運轉。 依本發明彩色畫像形成模式，係第一畫像形成手段以電子 15照相方式由複數色顯像劑形成畫像，從像載持體外周面轉寫在 媒體表面，又第二畫像形成手段形成黑白畫像在媒體表面來形 ® 成彩色畫像，於黑白畫像形式模式，係由第二畫像形成手段以 高速能形成黑白畫像在媒體表面。 又在本發明上述弟一'畫像形成手段’係於機械的所掃描光 2〇束照射於感光體表面形成的靜電潛像，以各色顯像劑各個顯像 來形成畫像。 上述第二畫像形成手段，其特徵爲具備排列該媒體搬運方 向垂直的主掃描方向之複數光源元件，並依次發光該光源元件 由電子照相方式執行形成黑白畫像。 200417827 8032-lTWP.doc-10/24 依本發明第一畫像形成手段，以機械的掃描雷射光等光束 而形成靜電潛像在感光體表面，故以比較低的成本能實現寬廣 的掃描範圍。又能隔開光源及感光體之間，所以在第一畫像形 成手段，係與光源分開處理感光體或顯像劑之供給部份，能容 5易執行補給顯像劑或交換感光體。第二畫像形成手段具備於媒 體搬運方向垂直排列在主掃描方向之複數光源元件，依次發光 光源元件由電子照相方執行形成黑色畫像，故容易地能執行以 高速於彩色畫像形成時形成黑白畫像，或同步於彩色畫像形成 速度者。 10 又本發明其特徵爲該顯像劑像載持體及該第一畫像形成手 段，係作爲一體的單元爲能夠裝卸者。 依本發明爲了形成彩色畫像所使用的顯像齊ij丨象寺胃m 一畫像形成手段，因作爲一體的單元以裝卸可能者，故由於$ 換單元就能執行補給顯像劑等，預先執行顯像齊寺體 I5 —畫像形成手段的相互位置調整等。第一畫像形成手段係僅使 用於彩色畫像形成時，故能使作爲單元的交換頻率減小。 【實施方式】 第1圖係本發明一^貫施例之形_畫像形成手段，表示彩色印 2〇刷機20構成之示意圖。彩色印刷機20在框體21內，包括··一用 紙儲藏機構22、一用紙供給機構23、一送紙輸送機構μ、一用 紙排出機構25、一彩色畫像形成單兀26、~光源單元π、一黑 白畫像形成單元28及一定像單元29。 在用紙儲藏機構22內，預先以一定形狀，例如「μ」或 -10- 200417827 8032-lTWP.doc-ll/24 「A3」、「A4」等單張狀之印刷用紙，儲藏至500張。所儲藏 的印刷用紙係以單張狀之媒體一張一張送出。從供紙機構23以 所定的時序供給到用紙輸送機構24，印刷用紙藉用紙輸送機構 24輸送的時候表面形成畫像。形成畫像的印刷用係由用紙排出 5機構25排出。並以面臨由用紙輸送機構24所輸送印刷用紙之輸 送路徑，配置彩色畫像形成單元26，以從光源單元27之光束掃 描，由電子照相方式形成彩色畫像。由用紙輸送機構24所送出 的印刷用紙輸送路徑，亦配置黑白畫像形成單元28，直接形成 黑白畫像在印刷用紙上。形成於印刷用紙上的彩色畫像及黑白 10畫像，乃由定像單元29的加熱及加壓，定像在印刷用紙上。 彩色畫像形成單元26，係包括由聚酉光亞胺素材料以無端 狀形成中間轉寫帶30，及三色相之畫像形成單元31、32、33， 於彩色畫像形成單元26中係以旋轉關係構成中間轉寫帶30，並 依色碳粉的彩色畫像由三個畫像形成單元31、32、33以串列方 I5式形成之，轉寫在印刷用紙上。於光源單元27具備雷射光掃描 單元34、35、36，將雷射束以旋轉鏡等機械的掃描照射於畫像 形成單元31、32、33的感光體表面，形成靜電潛像。在各畫像 形成單元31、32、33例如分別儲藏YMC色之彩色碳粉，以彩色 碳粉顯像感光體表面之靜電潛像，再轉寫顯像化的彩色碳粉畫 20像在中間轉寫帶30上者。 用紙輸送機構24，係大槪的輸送印刷用紙於與床面平行的 方向，中間轉寫帶30之旋轉路徑係包括大致垂直於床面所形成 的部份，沿該床面垂直的部份配置三色相之畫像形成單元31、 32、33。從三色相之畫像形成單元31、32、33轉寫於中間轉 -11- 200417827 8032-lTWP.doc-12/24 寫帶30外周面上彩色碳粉像，自用紙儲藏機構22由進給輥輪37 一張一張取出，由用紙供給機構23之載入輥輪38調整時序轉寫 於所供給的印刷用紙上。再於印刷用紙上，黑白畫像形成單元 28轉寫由黑色碳粉的黑白之碳粉畫像，以定像單元29使彩色及 5黑白之碳粉畫像同時受到加熱及加壓予以定像。僅執行形成黑 白畫像形成的動作模式，由作動器39能使中間轉寫帶3〇自印刷 用紙之輸送路徑能如離開地作變位。畫像形成之際的各部份控鲁 制，由控制器40來執行。在框體21表面，亦設置對彩色印刷機 20執行操作輸入的操作面板41。 10 亦即，彩色印刷機20以用紙輸送機構24—邊輸送單張狀媒 體的印刷用紙，作爲形成畫像於媒體表面的畫像形成手段功 能。中間轉寫帶30係循環於預先所設定的路徑，在外周面以靜 電的載持粉體狀顯像劑之畫像，一部份的路徑面臨媒體之輸送 路徑，將所載持的顥像劑之畫像作爲轉寫於媒體表面的顯像劑 15像載持體功能。畫像形成單元31、32、33配置在沿中間轉寫帶 30外周面之循環路徑，在外周面以作粉體狀之顯像劑由彩色碳 _ 粉作爲形成彩色畫像的第一畫像形成手段功能。黑白畫像形成 單元26配置在沿媒體之輸送路徑，作爲形成單色畫像於媒體表 面的第二畫像形成手段功能。 20 彩色畫像形成單元26包括爲顯像劑像載持體的中間轉寫帶 30及爲第一畫像形成手段的畫像形成單元31、32、33，作爲一 體的單元能夠裝卸於框體21。補給彩色碳粉等能由交換彩色畫 像形成單26來執行，並能預先加以執行中間轉寫帶30及畫像形 成單元31、32、33的相互位置調整等。彩色畫像形成單元26僅 -12- 200417827 8032-lTWP.doc-13/24 使用於彩色畫像形成時，所以能使作爲單元交換頻率減小。 第2圖表示第1圖黑白畫像形成單元之槪略的構成，黑白畫 像形成單元28分爲感光單元50及顯像單元51。在感光單元50包 _ 含感光鼓52，在用紙輸送機構24所輸送印刷用紙之表面以平行 5旋轉於搬方向垂直軸線周圍。感光鼓52之外周面係接觸或接近 所輸送印刷用紙之表面，能轉寫黑色之碳粉像在印刷用紙上。 在感光單元50內面臨感光鼓52外周面與軸線成平行的主掃描方 φ 向，包含排列多數發光二極體（LED)的LED光源53。使感光鼓 52外周一樣帶電，將作LED光源53之光源元件的LED，以對應 10於各一因應畫像濃度的發光強度，由於依次發光在主掃描方 向，能形成靜電潛像於感光鼓52外周面上。形成於感光鼓52外 周面上靜電潛像，由自顯像單元51供給的黑色碳粉予以顯像而 作顯像化。在顯像單元51設置顯像輥輪54，供給粉體狀之顯像 劑的碳粉於感光鼓52外周面上之靜電潛像作顯像化。儲藏碳粉 15在碳粉箱55內，以每一需要量供給於顯像輥輪54外周面上，使 用在靜電潛讎像。 * 第3圖表示第1圖之彩色印刷機20槪略的電氣構成控制器 40，包括CPU60、ROM61及RAM62，按照預先儲存在ROM61程式 由CPU60執行各種控制作業，CPU60因應於第1圖之操作面板41 20所設置之模式開關63的輸入，能夠將印刷機20控制成可切換爲 彩色印刷模式及黑白印刷模式動作者’ CPU60係於彩色印刷模 式時，以一定速度旋轉驅動中間轉寫帶3〇之皮帶驅動馬達64， 作動器39以印刷用紙輸送路徑作中間轉寫帶3〇，爲能夠轉寫彩 色碳粉像於印刷用紙表示的路徑’作動三色相之畫像形成單元 -13- 200417827 8032-lTWP.doc-14/24 31、32、33及光源單元27形成彩色畫像，同時亦動作黑白畫像 形成單元28。用紙供給機構23、用紙輸送機構24、用紙排出機 構25及黑白畫像形成單元28之動作，控制成同步於彩色畫像形 成單元26之動作、速度或時序。在黑白印刷模式CPU60，由作 5動器39使中間轉寫帶30自印刷用紙輸送路徑離開，停止皮帶驅 動馬達64及各畫像形成單元31、32、33之動作。用紙供給機構 23、用紙輸送機構24、用紙排出機構25及黑白畫線形成單元28 之動作，作較高速化於彩色印刷模式。 亦即爲第一畫像形成手段的畫像形成單元31、32、33，係 10將彩色畫像之形成由預先規定的複數色CMY彩色碳粉的畫像以 電子照相方式形成，係依次轉寫於作像載持體的中間轉寫帶30 外周面上來達成。作爲第二畫像形成手段的黑白畫像形成單元 28，係形成黑色畫像於爲媒體的印刷用紙表面。CPU60以彩色 印刷模式，將爲顯像劑像載持體的中間轉寫帶30的循環及第一 15畫像形成手段的畫像形成單元31、32、33的運轉，爲第一畫像 形成速度以預先規定的彩色印刷速度來達成，將媒體的印刷用 紙輸送速度及第二畫像形成手段的黑白畫像形成單元28的運轉 加以控制以配合於彩色印刷速度。在黑白印刷模式中’ CPU60 係控制顯像劑像載持體的中間轉寫帶30的循環及第一畫像形成 20手段之畫像形成單元31、32、33的運轉停止，並控制媒體的印 刷用紙輸送速度及第二畫像形成手段之黑白畫像形成單元28的 運轉，以較快於第一畫像形成速度的彩色印刷速度，以配合於 第二畫像形成速度的黑白印刷速度的運作。 第4圖係爲第1圖之彩色印刷機20中，第3圖之CPU60的槪略 -14· 200417827 8032-lTWP.doc-15/24 動作流程圖，自步驟so開始動作’在步驟S1係判斷模式開關63 之切換狀態是否爲黑白印刷模式。如判斷是爲黑白印刷模式 時，在步驟S2時則作動器39動作，使中間轉寫帶30從印刷用紙 輸送路徑離開，在步驟S3停止彩色畫像形成單元26的動作，亦 5即停止各畫像形成單元的動作31、32、33 ’亦即停止皮帶驅動 馬達64，也停止光源單元27。在步驟S4 ’係將用紙供給機構 23、用紙輸送機構24、用紙排出機構25及黑白畫像形成單元28 的動作，以高速化進行黑白印刷速度。在步驟S1中，如判斷爲 不是黑白印刷模式時，在步驟S5中，便使作動器39作動，使中 10間轉寫帶30與印刷用紙之輸送路徑相接近，在步驟S6中，係啓 動作彩色畫像形成單元26。亦即起動各畫像形成單元31、32、 33，亦起動皮帶驅動馬達64。也起動光源單元27。在步驟S7 中，係使用紙供給機構23、用紙輸送機構24、用紙排出機構25 及黑白畫像形成單元28之動作，以低速化進行彩色印刷速度。 I5在步驟S8，係以步驟S4的高速或以步驟S7的低速進行印刷黑白 畫像或彩色畫像在印刷用紙上，判斷是否爲結束印刷，未結束 時回到步驟S1。但是在步驟S1於模式開關63無變更，則繼續同 樣模式的印刷。如在步驟S8判斷爲結束印刷時，即在步驟S9停 止各部份動作。 2〇 本發明進行彩色印刷時，其速度約爲一分鐘20張 (2〇ppm)，而進行黑白印刷時，其速度約爲一分鐘30張 (30Ppm)。本發明彩色畫像形成因以機械的掃描雷射光等的光 束形成靜電潛像在感光體表面，故能以比較低的成本能實現較 爲寬廣的掃描範圍，又能使光源及感光體之間離開，所以於彩 -15- 200417827 8032-lTWP.doc-16/24 色畫像形成單元26將感光體或顯像劑之供給部份與光源單元27 係分開處理，能容易執行補給顯像劑或交換感光體。黑白畫像 形成單元28具備於印刷用紙輸送方向垂直的排列於主掃描方向 爲複數光源元件的LED，依次發光LED由電子照相方式執行形成 5黑色畫像，故能容易執行較彩色畫像形成速度爲高之黑白畫 像’或同步於彩像形成的速度者。 尙於黑白畫像形成單元28亦能與電子照相方式不同的噴墨 方式或熱轉寫方式等來形成黑白畫像。欲僅形成黑白畫像時， 僅在需要形成黑白畫像的部份能夠動作即可，所以能縮短至最 10初畫像形成的快速印字爲止所要的時間。又作爲顯像劑載持體 的中間轉寫帶30，雖轉寫以彩色畫像形成單元26所形成彩色碳 粉畫像’但亦可以由放電等直接形成靜電潛像，顯像彩色碳 粉。又將感光體帶或感光鼓作爲顯像劑像載持體使用，以電子 照相方式直接形成彩色碳粉畫像亦屬可行，謹此陳明。 15 如上所述的本發明，動作顯像劑像載持體及第一畫像形成 手段，使媒體的輸送及第二畫像形成手段的動作作同步，則能 重疊形成由第一畫像形成手段的顯像劑彩色畫像；及由第二畫 像形成手段的單色畫像於媒體表面上。 欲形成單色畫像時，可以停止顯像劑像載持體及第一畫像 2〇形成手段，故避免了感光體等之磨損能防止縮短壽命。單色畫 像之形成時，省略第一畫像形成手段之動作，可縮短啓動後至 形成最初畫面所要的時間。 又依本發明在彩色畫像形成模式中，由第一畫像形成手段 形成彩畫像及由第二線形成手段形成黑白畫像，在黑白畫像形 -16- 200417827 8032-lTWP.doc-17/24 成模式，由第二畫像形成手段僅能以高速形成黑白畫像。 又依本發明第一畫像形成手段，因機械的掃描光束來形成 靜電潛像在感光體表面，故能以比較低的成本實現寬廣掃描範 圍。第二畫像形成手段係依次發光複數發光二極體等等光源元 5件由電子照相方式形成黑色畫像，故能容易達成以較彩色畫像 形成時爲高的速度形成黑白畫像，或同步於彩色畫像形成速 度。 又依本發明，爲了形成彩色畫像使用的顯像劑像載持體及 第一畫像形成手段，作成以能夠裝卸的一體的單元，故能容易 1()執行補給顯像劑等的交換單元。 【圖式簡單說明】 第1圖爲本發明第一實施例形態’表示彩色印刷機槪略構成 剖面圖； 15 第2圖爲第1圖之黑白畫像形成單兀橇成剖面圖； 第3圖爲第1圖之彩色印刷機槪略的電氣的構成方塊圖； 第4圖爲第3圖之CPU控制步驟流程圖； 第5圖爲習用串列方式畫像形成裝置之〜例的簡略示意剖面 圖； 20 第6圖爲習用串列方式畫像形成裝置之其他例的簡略示意剖 面圖。 -17- 200417827 8032-lTWP.doc-18/24 【圖號說明】8032-lTWP.doc-5 / 24 玖, fiber _ month (the description of the invention should state: the technical field to which the invention belongs, the prior art, the content, the embodiments, and the drawings briefly) [the technical field to which the invention belongs] The present invention is An image forming apparatus is an image forming means capable of forming a color screen on a surface of a medium such as paper in a tandem method using an intermediate. [Prior Art] Conventionally, in image forming apparatuses such as printers, printers, and copiers, there are color portraits formed by electrophotography. In the case of an electrophotographic method, an image formed by offset printing or the like can be made into a plate making method, and the image can be formed at the same image quality or speed. The image formed by the electrophotographic method is called a toner-type powder-like developer, and is developed to form an electrostatic latent image. The colored toners for color portraits use Y (yellow, yellow), M (magenta 'magenta), C (cyan, cyan), and κ (black) for four hue. The electron portraits formed by the agent are superimposed to obtain color portraits. In the current industry's formation of electrophotographic color portraits, the mainstream technology is divided into four engineering methods and tandem methods. As far as the four engineering methods are concerned, it is a project, namely, formation, development, transfer, and fixation of electrostatic latent images. One-color portrait of YMCK is formed on the surface of the media. In order to repeat the portrait as a color portrait four times, the forming speed becomes slow. In addition, after the color image is transferred from the developer to the surface of the medium in a tandem manner, and the fixation is performed, the image forming speed as the color image can be made fast. 200417827 8032-lTWP.doc-6 / 24 Figure 5 and Figure 6 are in the tandem mode, respectively showing the method of sequentially stacking portraits by each color developer, and intermediate color by each color developer After stacking portraits, they are transferred to the media surface in a comprehensive way. As shown in FIG. 5, image forming apparatuses 1, 2, 3, and 4 for forming color portraits by electrophotography are arranged along the path of the paper 5 conveyance path 5a in the order of CMYK. Each of the image forming devices 1, 2, 3, and 4 corresponds to a portion of the conveyance path 5a, and transfer devices 6, 7, 8, and 9 are respectively provided to transfer the portrait of each color developer onto the surface of the paper 5. . The color image formed by the four-color developer is attached to the surface of the paper 5 and then transported to the fixing device 10, and at least a part of the developer is melted by heating and pressure, and the color image is formed in a durable state of 10 On the surface of paper 5. As shown in FIG. 6, the color portrait formed by the developer is the surface of the intermediate transfer belt 11 formed of a material such as polyimide, and is sequentially transferred from the four image forming devices 1, 2, 3, and 4 It is formed by writing a developer, and the developer of a color image developer is transferred to the rotation path facing the intermediate transfer belt 11 and the surface of the paper 5 facing the conveying path 5b 15 to the orientation device. At this time, it is oriented on the surface of the paper 5. For a device capable of forming an image as a large-sized sheet of paper 5, the conveying paths 5a and * 5b are horizontal directions of the large roll. In the tandem method using the intermediate transfer belt 11, the circulation path of the intermediate transfer belt 11 is made to become a vertically long shape, and the image forming devices 1, 2, 3, and 4 are arranged in the vertical direction. Save 20 installation spaces (for example, refer to Patent Document 1: Japanese Patent Application Laid-Open No. 2001-331008). The tandem color portraits shown in Figures 5 and 6 are formed because of four consecutive projects. The toner is formed by performing an image, and therefore has the following problems: (1) When only a black image is required, the CMY image forming apparatuses 1, 2, and 3 are drawn from the conveying path 5a of the paper 5 in FIG. 5 To leave, in Figure 6, 200417827 8032-lTWP.doc-7 / 24 is required to leave it from the middle transfer belt 11. In order to form an image by electrophotography, the image forming apparatuses 1, 2, 3, and 4 need to include a photoreceptor. Therefore, in the case of black image formation ^, although the photoreceptors of the CMY image forming apparatuses 1, 2, and 3 are not used, it is Contact-transfer paper to the paper 5 or the intermediate tape 11, so the wear and tear of the device will shorten the life of the device due to such abrasion. (2) In order to perform the four processes in a row, it takes some time from the first printing of the initial portrait. After startup, the continuous portraits form the so-called Pipe Line mode effect. With one portrait forming device 1, 2, 3, and 4, the time it takes to form the portrait is applied at a relatively high speed of 10 fj. . However, for the first time of image formation immediately after the start-up, the time required to form an image in sequence with the four image formation devices 1, 2, 3, and 4 becomes four times the time required for continuous image formation. Under the requirements for the formation of color portraits and black and white portraits, it is generally considered that there are more requirements for the formation of black and white portraits, that is, those who expect black and white portraits to be 90% and colors to be ι0%. When there is a lot of demand for black-and-white image formation, in particular, the photoreceptors of the image-forming devices 1, 2 and 3 for color image formation need to be reworked, so that the three image-forming devices 1, The institutions that left 2 and 3 will turn them into troublemakers. When there is a large demand for black and white portrait formation, the time required for high-speed printing 'or the time required for continuous image formation, that is, the necessity for shortening the black and white portrait formation time is much higher than the color portrait formation time. SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus capable of forming a color image, and a monochrome image such as black can be formed faster than a color image. 8032-lTWP.doc-8 / 24 The present invention relates to an image forming device for forming an image on the surface of a medium while carrying a single sheet of media, and the technical methods adopted include: a developer image bearing The body is circulated in a preset path, and the image of the powder-bearing developer is electrostatically carried on the outer surface. Part of the path is facing the conveying path of the media, and the image of the developer-carrying agent is transferred. Written on the surface of the media; a first image formation means arranged along a circulation path along the outer peripheral surface of the developer image bearing body, and a color image formed by a powdery developer on the outer peripheral surface; and a second image formation means, It is arranged along the conveying path of the medium to form a monochrome portrait on the surface of the medium. According to the image formation means of the present invention, in order to form an image on the surface of a single sheet of media being conveyed, it includes a developer image carrier, a first image formation means, and a second image formation means. The developer image supporting system is circulated in a predetermined path, and the image of the electrostatic powder-bearing developer is carried on the outer surface, and a part of the path is faced with the conveying path of the media, and the carried imaging is rewritten. The portrait of the agent is on the surface of the media. The first image forming means is arranged along a circulation path along the outer peripheral surface of the developer image bearing member. Since a color image of the powdered developer is formed on the outer peripheral surface, it is formed on the surface of the medium. The image was carried on the outer peripheral surface of the developer image carrier, and a color image of the powdery developer was formed by the first image forming means. Monochrome portraits are also formed on the surface of the media by the second portrait formation method. When the action developer image carrier and the first image formation means synchronize the movement of the media and the second image formation means, the color image of the developer formed by the first image formation means device can be superimposed, and The monochrome portrait of the second portrait forming means is on the surface of the media. When a monochrome image is to be formed, the developer image carrier and the first image forming means can be stopped, so that abrasion of the photoreceptor and the like can be prevented and the life can be prevented from shortening. Monochrome portraits are only possible by synchronizing the media transfer 200417827 8032-lTWP.doc-9 / 24 with the second image formation means. Therefore, the action of the first image formation means is not needed, and the initial image can be shortened after startup. The time required. According to the present invention, the first image forming means is characterized in that the color image is formed by a predetermined electrophotographic method of a plurality of colors and a developer, and is sequentially executed on the outer peripheral surface of the image carrier. The second image forming means forms a black image on the surface of the medium, and further includes a mode switching means, which can switch to a color image forming mode, and executes the image bearing body at a first image forming speed predetermined by φ. The circulation and the operation of the first image formation means are executed in accordance with the first image formation speed and the operation speed of the medium and the operation of the second image formation means; and the monochrome image formation mode, which stops the circulation of the image carrier and the first image. The operation of the forming means is performed in accordance with the second image forming speed that is faster than the first image forming speed, and the medium conveying speed and the operation of the second image forming means are performed. According to the color image formation mode of the present invention, the first image formation means forms an image from a plurality of color developers using an electronic 15 photographing method, and is transferred from the image bearing outer peripheral surface to the media surface, and the second image formation means forms a black and white image. Forming a color image on the media surface, in the black and white image form mode, the second image forming means can form a black and white image on the media surface at high speed. Furthermore, in the above-mentioned "image forming means" of the present invention, the electrostatic latent image formed by irradiating the surface of the photoreceptor with 20 beams of scanned light from the machine is used to form an image by developing each color developer. The second image forming means is characterized by including a plurality of light source elements arranged in a main scanning direction perpendicular to the medium conveying direction, and sequentially emitting the light source elements to form a black and white portrait by an electrophotographic method. 200417827 8032-lTWP.doc-10 / 24 According to the first image forming method of the present invention, an electrostatic latent image is formed on the photoreceptor surface by mechanically scanning a laser beam and the like, so that a wide scanning range can be realized at a relatively low cost. It can also separate the light source and the photoreceptor. Therefore, in the first image forming method, the photoreceptor or developer supply part is processed separately from the light source. It can easily replenish the developer or exchange the photoreceptor. The second image forming means is provided with a plurality of light source elements arranged vertically in the main scanning direction in the medium conveying direction. The light emitting light source elements are sequentially executed by the electrophotographic side to form a black image. Therefore, it is easy to perform black and white image formation at a higher speed than the color image formation. Or in sync with the speed of color portrait formation. The present invention is also characterized in that the developer image bearing member and the first image forming means are integrated as a unit capable of being attached and detached. According to the present invention, the imaging method used to form color portraits is a portrait formation method. As an integrated unit, it is possible to attach and detach the unit. Therefore, it is possible to replenish the developer and replace the unit. Imaging Qi Temple body I5-mutual position adjustment of image formation means, etc. Since the first image forming means is used only for color image forming, the exchange frequency as a unit can be reduced. [Embodiment] FIG. 1 is a schematic diagram of the image forming means of a consistent embodiment of the present invention, and shows a schematic diagram of the configuration of the color printing brush 20. The color printer 20 includes, within the housing 21, a paper storage mechanism 22, a paper supply mechanism 23, a paper feeding mechanism μ, a paper discharge mechanism 25, a color portrait forming unit 26, and a light source unit π. A black and white portrait forming unit 28 and a fixed image unit 29. In the paper storage mechanism 22, a single sheet of printing paper such as "μ" or -10- 200417827 8032-lTWP.doc-ll / 24 "A3", "A4", etc. is stored in advance to 500 sheets. The stored printing paper is sent out one by one in a single sheet of media. The paper feed mechanism 23 is fed to the paper conveyance mechanism 24 at a predetermined timing, and the printing paper is borrowed from the paper conveyance mechanism 24 to form an image on the surface when conveyed. The printing system for forming an image is discharged by a paper discharge mechanism 5. A color image forming unit 26 is arranged so as to face the conveyance path of the printing paper conveyed by the paper conveying mechanism 24, and scans the light beam from the light source unit 27 to form a color image by electrophotography. The printing paper conveying path sent by the paper conveying mechanism 24 is also provided with a black-and-white image forming unit 28 to directly form a black-and-white image on the printing paper. The color image and the black-and-white image formed on the printing paper are fixed on the printing paper by the heating and pressing of the fixing unit 29. The color image forming unit 26 includes an endless intermediate transfer belt 30 formed of a polyimide material and a three-color image forming unit 31, 32, and 33. The color image forming unit 26 is in a rotational relationship. The color portrait of the intermediate transfer belt 30 and the color toner is formed by the three portrait forming units 31, 32, and 33 in a tandem I5 format, and is transferred to the printing paper. The light source unit 27 is provided with laser light scanning units 34, 35, and 36, and irradiates a laser beam on a surface of a photoreceptor of the image forming units 31, 32, and 33 with a mechanical scan such as a rotating mirror to form an electrostatic latent image. For example, in each of the image forming units 31, 32, and 33, color toners of YMC color are stored, and the electrostatic latent image on the surface of the photoreceptor is developed with the color toners. Then, the developed color toner image 20 is transferred in the middle. Write the 30th one. The paper conveying mechanism 24 conveys printing paper in a direction parallel to the bed surface. The rotation path of the intermediate transfer belt 30 includes a portion formed substantially perpendicular to the bed surface, and is arranged along the vertical portion of the bed surface. Three-color image forming units 31, 32, and 33. Transferred from the three-color portrait formation unit 31, 32, 33 to the middle transfer-11- 200417827 8032-lTWP.doc-12 / 24 Write color toner images on the outer surface of the tape 30, and the paper storage mechanism 22 by the feed roller The wheels 37 are taken out one by one, and the timing is transferred to the supplied printing paper by the loading roller 38 of the paper supply mechanism 23. Then, on the printing paper, the black and white image forming unit 28 rewrites the black and white toner image made of black toner, and the fixing unit 29 fixes the color and 5 black and white toner images simultaneously by heating and pressing. Only the operation mode for forming a black-and-white portrait is executed. The actuator 39 can change the conveying path of the intermediate transfer belt 30 from the printing paper as it leaves. The control of each part when the portrait is formed is executed by the controller 40. An operation panel 41 for performing an operation input to the color printer 20 is also provided on the surface of the housing 21. 10 In other words, the color printer 20 functions as an image forming means for forming an image on the surface of a medium by using a paper conveying mechanism 24 to convey a sheet of sheet-shaped media. The intermediate transfer belt 30 is circulated in a predetermined path, and the image of the powder-bearing developer is electrostatically carried on the outer surface. Part of the path faces the conveying path of the media. The portrait functions as a developer 15 image carrier, which is transcribed on the surface of the media. The image forming units 31, 32, and 33 are arranged in a circulation path along the outer peripheral surface of the intermediate transfer belt 30. The powder is used as a developer on the outer peripheral surface. The color carbon powder serves as the first image forming means for forming a color image. . The black-and-white image forming unit 26 is disposed along the transport path of the medium and functions as a second image forming means for forming a monochrome image on the surface of the medium. 20 The color image forming unit 26 includes an intermediate transfer belt 30 that is a developer image carrier, and image forming units 31, 32, and 33 that are first image forming means. The unit can be attached to and removed from the frame 21 as a unit. The replenishment of color toner and the like can be performed by exchanging the color image forming sheet 26, and the mutual position adjustment of the intermediate transfer belt 30 and the image forming units 31, 32, 33, etc. can be performed in advance. The color image forming unit 26 is only -12- 200417827 8032-lTWP.doc-13 / 24 when it is used for color image forming, so it can reduce the exchange frequency as a unit. Fig. 2 shows a schematic configuration of the black-and-white image forming unit of Fig. 1. The black-and-white image forming unit 28 is divided into a photosensitive unit 50 and a developing unit 51. The photoconductor unit 50 includes a photoconductor drum 52, and the surface of the printing paper conveyed by the paper conveying mechanism 24 is rotated in parallel 5 around the vertical axis in the conveying direction. The outer peripheral surface of the photosensitive drum 52 is in contact with or near the surface of the conveyed printing paper, and can transfer black toner images on the printing paper. In the photosensitive unit 50, the main scanning direction φ facing the outer peripheral surface of the photosensitive drum 52 in parallel with the axis line includes an LED light source 53 in which a plurality of light emitting diodes (LEDs) are arranged. The outer periphery of the photosensitive drum 52 is charged, and the LEDs used as the light source elements of the LED light source 53 are emitted at a light intensity corresponding to 10 in accordance with the image density. Since the light is sequentially emitted in the main scanning direction, an electrostatic latent image can be formed on the periphery of the photosensitive drum 52 Surface. The electrostatic latent image formed on the outer peripheral surface of the photosensitive drum 52 is developed and developed by black toner supplied from the developing unit 51. A developing roller 54 is provided in the developing unit 51, and an electrostatic latent image on the outer peripheral surface of the photosensitive drum 52 supplied with the toner in powder form is developed by the toner. The stored toner 15 is supplied to the outer peripheral surface of the developing roller 54 in the toner box 55 at a required amount, and is used for an electrostatic latent image. * Fig. 3 shows the electrical configuration controller 40 of the color printer 20 shown in Fig. 1. It includes CPU60, ROM61, and RAM62. CPU60 executes various control tasks in accordance with programs stored in ROM61 in advance. CPU60 operates in accordance with Fig.1. The input of the mode switch 63 provided on the panel 41 to 20 can control the printing machine 20 to switch to the color printing mode and the black and white printing mode. When the CPU 60 is in the color printing mode, the intermediate transfer belt 3 is driven and rotated at a certain speed. The belt drive motor 64, the actuator 39 uses the printing paper conveying path as the intermediate transfer belt 3, and operates the three-color image forming unit for the path indicated by the color toner image on the printing paper. 13- 200417827 8032 -lTWP.doc-14 / 24 31, 32, 33 and the light source unit 27 form a color portrait, and also act as a black and white image formation unit 28. The operations of the paper supply mechanism 23, the paper conveyance mechanism 24, the paper discharge mechanism 25, and the black and white image forming unit 28 are controlled to be synchronized with the operation, speed, or timing of the color image forming unit 26. In the black-and-white printing mode, the CPU 60 moves the intermediate transfer belt 30 away from the printing paper conveyance path by the actuator 39, and stops the operation of the belt drive motor 64 and the image forming units 31, 32, and 33. The operations of the paper supply mechanism 23, the paper conveyance mechanism 24, the paper discharge mechanism 25, and the black-and-white line forming unit 28 are accelerated in the color printing mode. That is, the image forming units 31, 32, and 33 of the first image forming means. The system 10 forms a color image from an image of a predetermined plurality of CMY color toners in an electrophotographic manner, and sequentially transfers it to the image. The intermediate transfer tape 30 of the carrier is reached on the outer peripheral surface. The black-and-white image forming unit 28 as a second image forming means forms a black image on the surface of a printing paper as a medium. In the color printing mode, the CPU 60 rotates the intermediate transfer belt 30 of the developer image carrier and operates the image forming units 31, 32, and 33 of the first 15 image forming means. The predetermined color printing speed is achieved, and the media printing paper conveying speed and the operation of the black and white image forming unit 28 of the second image forming means are controlled to match the color printing speed. In the black-and-white printing mode, the CPU 60 is used to control the circulation of the intermediate transfer belt 30 of the developer image carrier and stop the operation of the image forming units 31, 32, and 33 of the first image forming 20 means, and control the printing paper of the media. The black and white image forming unit 28 of the conveying speed and the second image forming means operates at a color printing speed that is faster than the first image forming speed to match the operation of the black and white printing speed of the second image forming speed. FIG. 4 is a flowchart of the operation of the CPU 60 of FIG. 3 in the color printing press 20 of FIG. 1-200417827 8032-lTWP.doc-15 / 24. The operation flow chart starts from step so. It is determined whether the switching state of the mode switch 63 is a black and white print mode. If it is determined that the printing mode is black and white, the actuator 39 is operated at step S2 to leave the intermediate transfer belt 30 from the printing paper conveying path, and the operation of the color image forming unit 26 is stopped at step S3, that is, each image is stopped. The operations 31, 32, and 33 'of the forming unit stop the belt drive motor 64 and also stop the light source unit 27. In step S4 ', the operation of the paper supply mechanism 23, the paper transport mechanism 24, the paper discharge mechanism 25, and the black-and-white image forming unit 28 is performed to increase the speed of black-and-white printing. In step S1, if it is determined that the printing mode is not black and white, in step S5, the actuator 39 is actuated to bring the middle 10 transfer belts 30 close to the conveying path of the printing paper. In step S6, the system is started. Motion color image forming unit 26. That is, each of the image forming units 31, 32, and 33 is activated, and the belt drive motor 64 is also activated. The light source unit 27 is also activated. In step S7, the operations of the paper supply mechanism 23, the paper conveyance mechanism 24, the paper discharge mechanism 25, and the black-and-white image forming unit 28 are used to reduce the speed of color printing. I5 In step S8, the black and white image or color image is printed on the printing paper at the high speed of step S4 or the low speed of step S7, and it is determined whether or not the printing is finished. If not, the process returns to step S1. However, in step S1, the mode switch 63 is not changed, and printing in the same mode is continued. If it is determined in step S8 that the printing is to be ended, the operations of each part are stopped in step S9. 20 In the present invention, the speed of color printing is about 20 sheets (20 ppm) per minute, and the speed of black and white printing is about 30 sheets (30 Ppm) per minute. In the color image formation of the present invention, a latent electrostatic image is formed on the surface of the photoreceptor by using a mechanical scanning beam of laser light or the like, so that a relatively wide scanning range can be realized at a relatively low cost, and the light source and the photoreceptor can be separated. Therefore, Yu Cai-15- 200417827 8032-lTWP.doc-16 / 24 color image forming unit 26 separates the photoreceptor or developer supply part from the light source unit 27, and can easily replenish developer or exchange Photoreceptor. The black-and-white image forming unit 28 is provided with LEDs arranged in the main scanning direction as a plurality of light source elements vertically in the conveying direction of the printing paper. The sequentially emitting LEDs are executed by the electrophotographic method to form a 5 black image. Black-and-white portraits' or those synchronized with the formation of color images. The black-and-white image forming unit 28 can also form a black-and-white image by an inkjet method or a thermal transfer method different from the electrophotographic method. When only black and white portraits are to be formed, only the parts that need to be black and white portraits can be operated. Therefore, it is possible to shorten the time required for the rapid printing of the first 10 portraits. The intermediate transfer belt 30, which is also a developer carrier, transfers the color toner image formed by the color image forming unit 26 ', but it can also form an electrostatic latent image directly by discharging or the like to develop the color toner. It is also feasible to use a photoreceptor belt or a photoreceptor drum as a developer image carrier to directly form a color toner image by electrophotography. 15 In the present invention as described above, the action developer image carrier and the first image forming means synchronize the conveyance of the medium and the operation of the second image forming means, so that the display formed by the first image forming means can be superimposed. A color portrait of the toner; and a monochrome portrait by a second portrait forming means on the surface of the media. When a monochrome image is desired to be formed, the developer image carrier and the first image 20 forming means can be stopped, thereby avoiding abrasion of the photoreceptor and the like and preventing a shortened life. When a monochrome image is formed, omitting the operation of the first image forming means can shorten the time required from the start to the formation of the first screen. According to the present invention, in the color portrait formation mode, a color portrait is formed by the first image formation means and a black-and-white portrait is formed by the second line formation means. In the black-and-white portrait form-16- 200417827 8032-lTWP.doc-17 / 24, the pattern is formed. The second image forming means can only form a black and white image at a high speed. According to the first image forming method of the present invention, since the electrostatic latent image is formed on the surface of the photoreceptor by the mechanical scanning beam, a wide scanning range can be realized at a relatively low cost. The second image forming means is to sequentially emit light source elements such as a plurality of light emitting diodes and the like to form a black image by an electrophotographic method. Therefore, it is easy to form a black and white image at a higher speed than when a color image is formed, or synchronize with a color image. Formation speed. According to the present invention, in order to form a developer image bearing member and a first image forming means for use in a color image, the unit can be attached and detached, so that it is easy to perform a replacement unit such as replenishing the developer. [Brief description of the drawings] FIG. 1 is a sectional view showing a schematic configuration of a color printer according to a first embodiment of the present invention; FIG. 2 is a sectional view of a black and white portrait forming single skid of FIG. 1; FIG. Fig. 1 is a block diagram of the electrical structure of the color printing press; Fig. 4 is a flowchart of the CPU control steps of Fig. 3; Fig. 5 is a schematic cross-sectional view of an example of a conventional serial image forming device. 20 FIG. 6 is a schematic cross-sectional view of another example of a conventional tandem image forming apparatus. -17- 200417827 8032-lTWP.doc-18 / 24 [Illustration of drawing number]
20彩色印刷機 22儲藏機構 24輸送機構 26彩色畫像形成單元 28黑白畫像形成單元 30中間轉寫帶 38載入輥輪 40控制器 50感光單元 52感光鼓 60 CPU 21框體 23供給機構 25排出機構 27光源單元 29定像單元 31〜36畫像形成單元 39作動器 41操作面板 51顯像單元 53 LED光源20 Color printer 22 Storage mechanism 24 Conveying mechanism 26 Color image forming unit 28 Black and white image forming unit 30 Intermediate transfer belt 38 Loading roller 40 Controller 50 Photosensitive unit 52 Photoconductor drum 60 CPU 21 Frame 23 Supply mechanism 25 Discharge mechanism 27 light source unit 29 fixing unit 31 to 36 image forming unit 39 actuator 41 operation panel 51 developing unit 53 LED light source