200524809 九、發明說明： 【發明所屬之技術領域】 以移送滾輪 本發明係關於使用於印表機等列印裝置上 和按麼滾輪適當地移送紙張的用紙移送機構。 【先前技術】 μ的用紙移㈣構’配置在印表機側 紙拖盤（圖中未示）内的記錄媒體移送給列印部、或者;：= 列印部列印了时的記錄㈣送H將在 部。 、口向排出到印表機的外 基於圖3對先前如此的用紙移送機構_行說明 有藉由馬達（®巾未顿轉而可進行旋轉的料 配置有按㈣料滾輪52並域隨料料52的旋轉而^ 進行旋轉的按壓滾輪53。 上述按職輪53被由小螺絲54安裝在印表機側的框體上 的板簧55支撐著，由於板笼 “人 U的弹性力而彈性趨向於移送 滾輪52。而且，在移送滾輪52的下部，壓接著由收容於送 紙拖盤内：列印紙等厚紙張構成的記錄媒體5 6。 另外’藉由移送滾輪52的順時針方向的旋轉，可以向箭 頭Α的方向移送記錄媒體％。 而且，在用紙移送機構51的圖示左側，配置有具有列印 頭的列印部（圖中未示），在該列印部與用紙移送機構51之 間，配置有由於移送滾輪52的旋轉來將朝箭頭A方向移送的 記錄媒體56確實蚰水移 ^ , ^ 一 、夾緊、而向列印邛移送的移送滾輪（圖中 未示）和壓接滾輪（圖中未示）。 93640.doc 200524809 另外，被送紙滾輪和壓接滾輪夾緊的記錄媒體56，由送 紙滾輪的往復旋轉，可往復地沿列印部進行移送。 如果對將如此的先前用紙移送機構5丨例如用於熱轉印印 表機進行彩色列印時的動作進行說明，則首先藉由移送滾 輪52的順時針方向旋轉，將收容於送紙拖盤内的記錄媒體 56按箭頭A的方向移送，而移送到圖示左側的列印部（圖中 未示）。 此％的記錄媒體56，被配置在列印部附近的送紙滾輪和 按壓滾輪夹緊，並被移送到熱敏頭處於擡起狀態的列印部。 當將上述記錄媒體56的一定的量移送到列印部後，則檢 測出列印媒體56的後端部56b並進行列印開始時的露頭。此 時的記錄媒體56離開移送滾輪52的壓接，成爲被送紙滾輪 和壓接滾輪夾緊的狀態。 另外，5己錄媒體露頭後，將熱敏頭壓下，將色帶壓接在 記錄媒體56上並由送紙滾輪的旋轉將記錄媒體％朝箭頭A 相反的方向的箭頭B的方向牵引並進行回送。 此時，藉由熱敏頭的發熱元件有選擇地發熱，將色帶的 第一顏色的墨熱轉印到記錄媒體56上，從而將第一顏色的 圖像列印在記錄媒體56上。 由上述送紙滾輪向箭頭B方向牽引而被回送的記錄媒體 56,是其後端部56b被移送滾輪52和按壓滾輪53夾持而向箭 頭方向回送的。 然後，將記錄媒體56反復移送到列印部，在第一顏色的 圖像上重：£列印第一顏色，在第二顏色的圖像上重疊列印 93640.doc 200524809 第三顏色，因此可以在記錄媒體56上列印所希望的彩色畫 像。 [專利文獻1]特開平7-19777號公報 特開平8-259030號公報 但是，先前的用紙移送機構，由板簧55支撐按壓滾輪兄， 該板簧55有小螺絲54固定在框體側，因此零件的數量以及 組裝工序變多，産生增加成本的問題。 而且，當將列印中的記錄媒體56向箭頭B方肖回送時，如 圖4所示，記錄媒體56的後端部56b會碰到移送滾輪52和按 壓滾輪53，而記錄媒體56向上方按壓㈣滾輪叫，就可 能發生移送錯位。 記錄媒體56上如果發生如此的錯位，在重疊列印不同的 顏色而進行彩色列印時’就會發生列印錯位的列印不良的 問題 【發明内容】 本發明，係鑒於前述課題而為者，其目的在於提供一種 可乂減V 7件數里和組裝成本’並且即使往復移送記錄媒 體也不會發生移送錯位的用紙移送機構。 爲了實現上述目的第一方案，本發明的用紙移送機構， 其4寸徵在於·具備由驅動馬達的驅動力所旋轉驅動的移送 滾輪及配置在A移送滾輪的上方並可自由旋轉的按壓滾 輪上述按[滾輪，可利用其自重按壓在與上述移送滾輪 之間被移送的記錄媒體。 而且’爲-了實現上述目的第二方案，其特徵在於：在上 93640.doc 200524809 述按壓滾輪與上述移送滚輪之間，形成較上述記錄媒體的 厚度尺寸窄的間隙。 而且’爲了實現上述目的第三方案，其特徵在於：上述 移送滾輪，其旋轉軸可旋轉地支撐在列印裝置側的框體 上，上述按壓滾輪，其旋轉軸可上下活動地支撐在形成於 上述框體上的上下方向的長孔狀支撐孔中，並且當上述記 錄媒體被移送到上述間隙時，上述按壓滾輪被壓向上方， 上述旋轉軸在上述長孔内上升，並且利用上述按壓滚輪的 自重使上述記錄媒體由上述移送滾輪所按壓。 而且，爲了實現上述目的的第四方案，其特徵在於··上 述間隙的尺寸係形成爲上述記錄媒體厚度的1/2。 【實施方式】 以下參照圖式1、，2對本發明的用紙移送機構進行說明。 首先，圖1係說明採用本發明的用紙移送機構的列印裝置的 概要圖。圖2係關於本發明的用紙移送機構的放大圖。 首先’本發明的用紙移送機構1被組裝在列印裝置p中， 可以在後述的送紙滾輪6與壓接滾輪7之間移送記錄媒體。 如圖1、圖2所示，藉由傳動機構（圖中未示）將外周部被 橡膠等高摩擦材料包覆的移送滾輪2連結到馬達（圖中未示） 上，而可旋轉地配置上述用紙移送機構1。 而且’在移送滾輪2的上方配置可自由旋轉的壓接滾輪 3。該壓接滾輪3由比重較大的金屬構成。 而且’由列印裝置P側的框體4的一部分分別支撐移送滾 輪2的5疋轉軸2 a和壓接滾輪3的旋轉軸3 a。 93640.doc 200524809 而且，支撐按壓滾輪3的旋轉軸33的支撐孔钝在上下方向 被形成長孔形狀。因此，按壓滾輪3可以沿著長孔形狀的支 撐孔4a使旋轉軸3a上下活動。 那麽，如圖2所示，在支撐孔4a的支撐下因自重而下降時 的按壓滾輪3與移送滾輪之間，形成規定尺寸的間隙G。上 述移送滾輪2與按壓滾輪3之間的間隙G，由構成記錄媒體$ 的列印紙等的厚紙的厚度尺寸τ的大致1/2的尺寸而形成。 而且，在間隙G的移送滾輪2與按壓滾輪3之間，夾持在後 述的列印部8正在列印的或者已經列印完了的記錄媒體$， 而由按壓滾輪3的自重即可壓住移送滾輪2。 而且，在移送滾輪2的下部，壓接收容於送紙盤（圖中未 不）的記錄媒體5，藉由移送滾輪2向順時針方向旋轉，可使 之向箭頭C方向移送。 以熱轉印式印表機來說明採用如此的本發明的用紙移送 機構1的列印裝置Ρ，在箭頭C的記錄媒體5的料方向的用 紙移送機構！的下游側，配置圓柱狀的送紙滾輪6、和配置 在该运紙滾輪6.的圖示上部側由螺旋彈簧（圖中未示）等按嬋 在送紙滾輪6上的壓接滾輪7。 土 而且，藉由移送滾輪2的旋轉從送紙盤向箭頭c方向移送 、己錄媒體5被送紙滾輪6和壓接滾輪7之間壓接夾持而、皮 夹緊。 、3 破上述送紙滾輪6和壓接滾輪7夾緊的記錄媒體5，可以 向逆日可針方向旋轉送紙滚輪6，而被移送到位於送紙滾 6的下游側附近的列印部8。 … 93640.doc 200524809 在上述列印部8上，在移送來的記錄媒體5的上方側配置 有熱敏頭9,在該熱敏頭9的下部側配置有可自由旋轉㈣ 、我滾輪10 $外’熱敏頭9可以相對壓紙滾輪⑺接觸離開（頭 擡起/頭下降）。 而且，在熱敏頭9與壓紙滾輪1〇之間來回通過色帶u，該 色τ 11比如S彳的面^圖示下面側上依次形成不同顏色 的墨而構成彩色色帶，由熱敏頭9將彩色墨依次重復地列印 在δ己錄媒體上從而可以列印彩色佥像。 而且，色帶11分別一端卷在卷帶輪（圖中未示）上，而另一 方卷在供給輪（圖中未示）上，並使色帶可以向箭頭Ε的方向 捲曲滑動。而且在色帶u的移送路徑上，配置端緊滚輪^。 說明在如此的列印裝置P的記錄媒體5上列印所希望的的 衫色晝像的動作，首先將熱敏頭9擡起，與壓紙滾輪1〇離開 規定的距離，處於列印前的待機狀態。 在該待機狀態，將由紙張機構丨向箭頭c方向移送的記錄 媒體5壓接夾持在送紙滾輪6與壓接滾輪7之間，並由送紙滾 輪6的旋轉將記錄媒體5進一步向箭頭c的方向移送到擡起 狀態的熱敏頭9與壓紙滾輪1〇之間。 、然後，當記錄媒體5向箭頭c方向移送規定的量並由紙張 感測器（圖中未示）檢測出記錄媒體5的後端部此後，進行列 印開始前的記錄媒體5的露頭，並停止記錄媒體5的移送。 菖進行了 4 5己錄媒體5的露頭後，使熱敏頭9降下壓接位 於壓紙滾輪10上的記錄媒體5上的色帶13。 同時根據·列印資訊有選擇地使熱敏頭9的多個發熱元件 93640.doc 200524809 9a發熱，並且使送紙滾輪6向圖示順時針方向旋轉，向箭頭 D方向拉動記錄媒體5進行回送。 w 、 於是，如圖2所^記錄媒體5的後端部^就會碰到移送 滾輪2和按壓滾輪3。 此時’移送滾輪2與送紙是一樣的、也向順時針方向旋 轉，而且按麼滾輪3由自重的作用在支撐槽4&内下降，在移 送滚輪2之間形成間隙g。 夕 然後，向箭頭D方向回送的記錄媒體5的後端部外，藉由 將按Μ滾輪3壓向上方，由移送滾輪2的順時針方向旋^， 將向箭頭D方向回送的記錄媒體5牽引到移送滾輪2與按壓 滾輪3之間並可以向箭頭d方向進一步回送。 上述按麼滾輪3由自重的作用下降，因此，向箭頭d方向 回送的列印紙等的厚紙構成的記錄媒體5,可以容易 壓滾輪3頂向上方。 如此，就將色帶13的青綠色熱轉印到向箭頭d方向回送的 記錄媒體5的一方的面(圖示上面)上，並進行第一顏色的書 像列印。 並且，當第一顏色的畫像列印完成後，使移送滾輪2與送 紙滾輪6的旋轉反轉並將記錄媒體5再次返回到記錄開始的 位置’與以青綠色的墨的畫像列印一樣，在青綠色的第一 顏色的上面重疊列印深紅色的墨，進行第二顏色的晝像列 印〇 然後，反復進行同樣的動作，在深紅色的第二顏色書像 的上面重疊列印黃色墨，從而進行第三顏色畫像列印，並 93640.doc -11 - 200524809 可以在記錄媒體5上列印所希望的彩色晝像。 上述彩色列印中的記錄媒體5在被送紙滾輪6和壓接滾輪 7夾持的狀態往返移送，每個列印動作，都會使記錄媒體5 的後端α卩5 b碰到本發明的用紙移送機構J的移送滾輪2和按 [滾輪3但疋，纪錄媒體5的後端部5b可以順利地將因自 重而下降的按壓滾輪3頂起來。 口此可以防止在移送中的記錄媒體5上發生錯位，即使 在重豐列印不同顏色的彩色列印時，也可以列印出沒有錯 位的高質量的晝像。 卜70成了所希望的彩色畫像的列印的記錄媒體5，解 除了由送紙滚輪6和壓接滾輪7的夾持，由移送滾輪2和麗接 滾輪3向箭頭D方向回送，並向列印裝置p的外面排出紙張。 而且，本發明的用紙移送機構卜以按壓滾輪3的自重將 記錄媒體5按壓在移送滾輪2上，不需要先前的板簧μ以及 小螺絲54等，因此可以削減數量和組裝工作量。 另外，在本發明的實施例的說明中，是以彩色列印 的說明，但是也可以藉由在使用在色帶上塗上—種顏色的 油墨的色帶而進行單色的晝像列印。 :二熱轉印印表機說明記錄裝置p，也可以是採用由 ”、、感Λ構成的記錄媒體的熱感式印表機。 如上上述，本發明的按壓滾輪，由於可以用自重對在移 运滾輪之間移送的記錄媒體進行按壓，因此不需要先前的 板菁或小螺絲’肖彳減了零件數量以及組^作量 供 可以減少成本的用紙移送裝置。 兀钕供 93640.doc 200524809 而且自於在按麼滾輪和移送滾輪之間形成比記錄媒體 厚度尺寸小的間隙，因此將回送的記錄媒體順利地牽引到 移送滾輪與按麼滾輪之間，並可以不費事地將按壓滚輪 起來。 研 因此，即使反復地往返移送記錄媒體，也不會發生移送 錯位，可以列印高質量的彩色晝像等。 、 而且，當向間隙移送了記錄媒體後，將按壓滾輪頂向上 方，旋轉軸在長孔上上升的同時，由按壓滾輪的自重將記 錄媒體按壓在移送滾輪上，因此，由回送的記錄媒體的後 端部容易地頂起按壓滾輪，可以反復地沒有錯位地往返移 送記錄媒體。 而且’由於以記錄媒體的厚度尺寸的1/2的尺寸形成間 隙’因此’可以用很小的記錄媒體的回送力確實地頂起按 C滾輪’並且被頂起的按壓滾輪由自重的作用還確實地按 壓在記錄媒體上。 【圖式簡單說明】 圖1係說明採用本發明的用紙移送機構的列印裝置的概 要圖。 圖2係本發明的用紙移送機構的放大圖。 圖3係說明先前的用紙移送機構的概要圖。 圖4係說明先前的用紙移送機構的問題的概要圖。 【主要元件符號說明】 1 傳送機構 2 · 傳送滾輪 93640.doc 、 200524809 2a 旋轉軸 3 壓接滾輪 3a 旋轉軸 4 框體 4a 支撐孔 5 記錄介質 5a 後端部 5b 後端部 6 送紙滾輪 7 壓接滾輪 8 印刷部 9 熱敏頭 9a 發熱元件 10 壓紙滾輪 11 色帶 12 細緊滾輪 13 •色帶 51 傳送機構 52 傳送滾輪 53 按壓滾輪 54 小螺絲 55 板簧 56 記錄介質 56 - 後端部200524809 IX. Description of the invention: [Technical field to which the invention belongs] With a transfer roller The present invention relates to a paper transfer mechanism that is used in a printing device such as a printer and the roller is used to properly transfer paper. [Prior art] μ's paper transfer structure 'The recording medium arranged in the paper tray (not shown in the figure) on the printer side is transferred to the printing section, or: == the record when the printing section is printed㈣ Send H will be in the ministry. 3, the paper transfer mechanism previously described based on Fig. 3 will be described as follows. The paper can be rotated by the motor (®), and the material can be rotated by the press roller 52 and the field is followed. The pressing roller 53 is rotated by the rotation of the material 52. The above-mentioned pressing wheel 53 is supported by a leaf spring 55 mounted on the printer side frame by a small screw 54. The elasticity tends to the transfer roller 52. Further, the lower part of the transfer roller 52 is pressed against a recording medium 56 composed of a thick paper such as printing paper contained in a paper feed tray. In addition, 'the clockwise direction of the transfer roller 52 The recording medium% can be moved in the direction of the arrow A by the rotation of the recording medium. A printing section (not shown) having a print head is arranged on the left side of the paper conveying mechanism 51 in the illustration, and the printing section and the paper Between the transfer mechanism 51, a recording roller 56 that moves in the direction of the arrow A due to the rotation of the transfer roller 52 is surely moved ^, ^ First, the transfer roller that clamps and transfers to the print cartridge (not shown in the figure) (Shown) and crimping wheels (not shown) 93640.doc 200524809 In addition, the recording medium 56 clamped by the paper feed roller and the pressure contact roller can be reciprocatedly moved along the printing section by reciprocating rotation of the paper feed roller. If such a previous paper feed mechanism 5 is used,丨 For example, when the operation of a thermal transfer printer for color printing is described, firstly, the recording medium 56 stored in the paper feed tray is rotated in the direction of arrow A by rotating the transfer roller 52 clockwise. It is transferred to the printing section on the left (not shown in the figure). This% recording medium 56 is clamped by the paper feed roller and pressing roller arranged near the printing section, and is transferred to the thermal head. The printing section is in a lifted state. When a certain amount of the above-mentioned recording medium 56 is transferred to the printing section, the rear end portion 56b of the printing medium 56 is detected and exposed at the beginning of printing. Recording at this time The medium 56 leaves the crimping contact of the transfer roller 52, and is clamped by the paper feeding roller and the crimping roller. In addition, after the recording medium 5 is exposed, the thermal head is pressed down, and the ribbon is crimped onto the recording medium 56. And by the rotation of the paper feed roller The recording medium% is pulled and returned in the direction of arrow B opposite to the direction of arrow A. At this time, the heating element of the thermal head selectively generates heat, and the first color ink of the ribbon is thermally transferred to The recording medium 56 prints an image of the first color on the recording medium 56. The recording medium 56 that is pulled back by the paper feed roller in the direction of arrow B is the rear end portion 56b of which is transferred by the roller 52 and Pressing the roller 53 to clamp it and returning it in the direction of the arrow. Then, the recording medium 56 is repeatedly transferred to the printing section, and it is repeated on the image of the first color: £ the first color is printed on the image of the second color The third color of 93640.doc 200524809 is superimposed, so that a desired color portrait can be printed on the recording medium 56. [Patent Document 1] Japanese Unexamined Patent Publication No. 7-19777 Japanese Unexamined Patent Publication No. 8-259030 However, the conventional paper transfer mechanism is supported by a plate spring 55 to press a roller brother, and the plate spring 55 has small screws 54 fixed to the frame side. Therefore, the number of parts and the number of assembling processes are increased, which causes a problem of increasing costs. When the recording medium 56 being printed is returned to the arrow B, as shown in FIG. 4, the rear end portion 56 b of the recording medium 56 hits the transfer roller 52 and the pressing roller 53, and the recording medium 56 faces upward. If you press the ㈣ roller to call, the misalignment may occur. If such a misalignment occurs on the recording medium 56, when a different color is printed in an overlapping manner and a color printing is performed, a problem of poor printing may occur. [Summary of the Invention] The present invention is made in view of the foregoing problems. The purpose is to provide a paper transfer mechanism that can reduce V 7 number of miles and assembly costs, and does not cause misalignment even when the recording medium is transferred back and forth. In order to achieve the first aspect of the above-mentioned object, the paper transfer mechanism of the present invention has a 4-inch feature that it includes a transfer roller that is rotationally driven by the driving force of a drive motor, and a pressing roller that is disposed above the A transfer roller and can rotate freely. Press the [roller] to use its own weight to press the recording medium transferred between the roller and the transfer roller. Moreover, the second solution for achieving the above-mentioned object is characterized in that a gap narrower than the thickness and size of the recording medium is formed between the pressing roller and the transfer roller described in 93640.doc 200524809. Moreover, in order to achieve the third aspect of the above object, the rotation axis of the transfer roller is rotatably supported on a frame on the side of the printing device, and the rotation axis of the pressing roller is movably supported on a shaft formed on the In the long hole-shaped support hole in the up-down direction on the frame, and when the recording medium is moved to the gap, the pressing roller is pressed upward, the rotation shaft rises in the long hole, and the pressing roller is used. The dead weight causes the recording medium to be pressed by the transfer roller. Furthermore, in order to achieve the fourth aspect of the above object, the size of the gap is formed to be 1/2 of the thickness of the recording medium. [Embodiment] The paper transfer mechanism of the present invention will be described below with reference to Figs. First, Fig. 1 is a schematic diagram illustrating a printing apparatus using a paper transfer mechanism of the present invention. Fig. 2 is an enlarged view of a paper transfer mechanism according to the present invention. First, the paper transfer mechanism 1 of the present invention is incorporated in a printing device p, and a recording medium can be transferred between a paper feed roller 6 and a pressure contact roller 7 described later. As shown in FIGS. 1 and 2, the transfer roller 2 whose outer peripheral portion is covered with a high-friction material such as rubber is connected to a motor (not shown) by a transmission mechanism (not shown) and is rotatably arranged. The paper transfer mechanism 1 described above. Further, a crimping roller 3 which is freely rotatable is arranged above the transfer roller 2. The pressure contact roller 3 is made of a metal having a large specific gravity. Further, a part of the housing 4 on the side of the printing apparatus P supports the 5 疋 rotation shaft 2a of the transfer roller 2 and the rotation shaft 3a of the pressure contact roller 3, respectively. 93640.doc 200524809 Furthermore, the support hole supporting the rotation shaft 33 of the pressing roller 3 is formed into a long hole shape in the vertical direction. Therefore, the pressing roller 3 can move the rotary shaft 3a up and down along the long hole-shaped support hole 4a. Then, as shown in Fig. 2, a gap G having a predetermined size is formed between the pressing roller 3 and the transfer roller when they are lowered by their own weight under the support of the support hole 4a. The gap G between the transfer roller 2 and the pressing roller 3 is formed by a size approximately ½ of a thickness τ of a thick paper such as a printing paper constituting the recording medium $. In addition, between the transfer roller 2 and the pressing roller 3 of the gap G, the recording medium $ which is being printed or has been printed by the printing unit 8 described later is clamped, and can be pressed by the weight of the pressing roller 3 Transfer roller 2. Further, the recording medium 5 contained in the paper feed tray (not shown in the figure) is pressed and received at the lower portion of the transfer roller 2, and the transfer roller 2 can be rotated in the direction of arrow C by rotating it clockwise. A thermal transfer printer will be used to describe the printing device P of the paper transfer mechanism 1 of the present invention, and the paper transfer mechanism of the recording medium 5 in the direction of the arrow C! On the downstream side, a cylindrical paper feed roller 6 is disposed, and the upper side of the paper conveying roller 6 shown in the figure is pressed by a coil spring (not shown), and the pressure contact roller 7 is pressed on the paper feed roller 6. . Further, by rotating the transfer roller 2 from the paper feed tray in the direction of the arrow c, the recorded medium 5 is clamped by the pressure contact between the paper feed roller 6 and the pressure contact roller 7, and clamped. , 3 The recording medium 5 clamped by the paper feed roller 6 and the crimping roller 7 can be rotated to the reverse direction and can be moved to the printing section located near the downstream side of the paper feed roller 6. 8. … 93640.doc 200524809 On the printing section 8 above, a thermal head 9 is arranged on the upper side of the transferred recording medium 5 and a freely rotatable roller is arranged on the lower side of the thermal head 9. My roller 10 $ The outer thermal head 9 can be moved away from the platen roller ⑺ (head up / down). In addition, a color ribbon u is passed back and forth between the thermal head 9 and the platen roller 10, and the color τ 11 such as S 彳 is formed on the lower side of the figure in order to form different color inks to form a color ribbon. The head 9 repeatedly prints the color ink on the delta recording medium in order to print a color artifact. Furthermore, one end of the ribbon 11 is wound on a take-up roller (not shown), and the other is wound on a supply roller (not shown), and the ribbon can be rolled and slid in the direction of arrow E. Further, an end-tightening roller ^ is arranged on the transfer path of the ribbon u. The operation of printing a desired shirt-color day image on the recording medium 5 of such a printing device P will be described. First, the thermal head 9 is raised, and a predetermined distance from the platen roller 10 is placed before printing. Standby. In this standby state, the recording medium 5 transferred by the paper mechanism 丨 in the direction of the arrow c is crimped and clamped between the paper feed roller 6 and the pressure contact roller 7, and the recording medium 5 is further moved to the arrow by the rotation of the paper feed roller 6. The direction c is transferred between the thermal head 9 and the platen roller 10 in a raised state. Then, when the recording medium 5 moves a predetermined amount in the direction of the arrow c and a rear end of the recording medium 5 is detected by a paper sensor (not shown), thereafter, the exposure of the recording medium 5 before printing is started, The transfer of the recording medium 5 is stopped. After the exposure of the recording medium 5 is performed, the thermal head 9 is lowered to press-contact the ribbon 13 on the recording medium 5 on the platen roller 10. At the same time, the multiple heating elements of the thermal head 9 are selectively heated according to the print information. 93640.doc 200524809 9a, and the paper feed roller 6 is rotated clockwise as shown in the figure, and the recording medium 5 is pulled in the direction of the arrow D for return. . w. Then, as shown in FIG. 2, the rear end portion of the recording medium 5 will touch the transfer roller 2 and the pressing roller 3. At this time, the 'transfer roller 2 is the same as the paper feed, and also rotates clockwise, and the roller 3 is lowered in the support groove 4 & by its own weight, and a gap g is formed between the transfer rollers 2. Then, outside of the rear end portion of the recording medium 5 returned in the direction of the arrow D, the recording medium 5 returned in the direction of the arrow D will be rotated by pressing the M roller 3 upward and turning it clockwise by the transfer roller 2 ^. It is pulled between the transfer roller 2 and the pressing roller 3 and can be further returned in the direction of the arrow d. The above-mentioned pressing roller 3 is lowered by its own weight. Therefore, the recording medium 5 composed of thick paper such as printing paper returned in the direction of the arrow d can be easily pressed upward by the roller 3. In this way, the cyan-green color of the ribbon 13 is thermally transferred to one side (upper side of the figure) of the recording medium 5 returned in the direction of the arrow d, and a book image of the first color is printed. After the image printing of the first color is completed, the rotation of the transfer roller 2 and the paper feeding roller 6 is reversed and the recording medium 5 is returned to the recording start position again. It is the same as the image printing with cyan ink. , Crimson ink is superimposed and printed on the first color of cyan, and day image of the second color is printed. Then, the same operation is repeated, and superimposed on top of the book image of the second color of magenta. The yellow ink is used to print the third color image, and the desired color day image can be printed on the recording medium 5 on 93640.doc -11-200524809. The recording medium 5 in the above-mentioned color printing is moved back and forth while being clamped by the paper feed roller 6 and the crimping roller 7, and each printing operation causes the rear end α 卩 5 b of the recording medium 5 to meet the present invention. The transfer roller 2 of the paper transfer mechanism J and pressing the [roller 3, but the rear end portion 5b of the recording medium 5 can smoothly push the pressing roller 3 lowered by its own weight. This can prevent misalignment on the recording medium 5 being transferred, and can print high-quality day images without misalignment even when printing in different colors and colors. Bu 70 became the desired recording medium 5 of the printed color image. The clamping by the paper feed roller 6 and the pressure contact roller 7 was released, and the feed roller 2 and the contact roller 3 were returned in the direction of arrow D and returned to the direction of arrow D. Paper is discharged from the outside of the printing device p. In addition, the paper transfer mechanism of the present invention presses the recording medium 5 against the transfer roller 2 by the weight of the pressing roller 3. Since the previous leaf spring µ and the small screw 54 are not required, the number and assembly work can be reduced. In addition, in the description of the embodiment of the present invention, the color printing is used. However, it is also possible to perform monochrome day image printing by using a ribbon in which a color ink is applied to the ribbon. : Two thermal transfer printers. The recording device p can also be a thermal printer using a recording medium composed of "," and Λ. As described above, since the pressing roller of the present invention can The recording medium transferred between the moving rollers is pressed, so the previous plate jing or small screws are not needed. Xiao Xiao reduced the number of parts and the amount of work required to reduce the cost of the paper transfer device. Wudung for 93640.doc 200524809 And since a gap smaller than the thickness of the recording medium is formed between the pressing roller and the transfer roller, the returned recording medium is smoothly drawn between the transferring roller and the pressing roller, and the pressing roller can be effortlessly Therefore, even if the recording medium is repeatedly transferred back and forth, no misalignment will occur, and high-quality color day images can be printed. Moreover, when the recording medium is transferred to the gap, the pressing roller will be pushed upwards, While the rotary shaft is rising on the long hole, the recording medium is pressed against the transfer roller by the weight of the pressing roller. Therefore, the The end easily lifts the pressing roller, so that the recording medium can be repeatedly transferred back and forth without dislocation. Also, 'the gap is formed by 1/2 of the thickness dimension of the recording medium', so that the return force of the recording medium can be small. The press roller C is reliably lifted, and the lifted pressing roller is pressed against the recording medium by its own weight. [Brief Description of the Drawings] Fig. 1 illustrates a printing device using a paper transfer mechanism of the present invention. A schematic diagram. Fig. 2 is an enlarged view of a paper transfer mechanism of the present invention. Fig. 3 is a schematic diagram illustrating a conventional paper transfer mechanism. Fig. 4 is a schematic diagram illustrating a problem of a conventional paper transfer mechanism. [Description of Symbols of Major Components] 1 Conveying mechanism 2 · Conveying roller 93640.doc, 200524809 2a Rotating shaft 3 Crimping roller 3a Rotating shaft 4 Frame 4a Support hole 5 Recording medium 5a Rear end 5b Rear end 6 Paper feed roller 7 Crimp roller 8 Printing section 9 Thermal head 9a Heating element 10 Platen roller 11 Ribbon 12 Squeeze roller 13 • Ribbon 51 Conveying mechanism 52 Conveying roller 53 Press 55 the leaf spring wheel 56 recording medium 54 small screws 56 - a rear end portion
93640.doc -14- 200524809 A 箭頭 B 箭頭 C 前頭 D 箭頭 E 箭頭 G 間隙 P 印刷裝置93640.doc -14- 200524809 A arrow B arrow C front D arrow E arrow G clearance P printing device
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