JP2009066801A - Head holding mechanism - Google Patents

Head holding mechanism Download PDF

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JP2009066801A
JP2009066801A JP2007235144A JP2007235144A JP2009066801A JP 2009066801 A JP2009066801 A JP 2009066801A JP 2007235144 A JP2007235144 A JP 2007235144A JP 2007235144 A JP2007235144 A JP 2007235144A JP 2009066801 A JP2009066801 A JP 2009066801A
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head
platen roller
image receiving
receiving paper
bearing
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Hiroshi Nakao
洋 中尾
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a head holding mechanism capable of improving not only relative positioning accuracy of a head and a platen roller in an image receiving paper conveying direction but also relative positioning accuracy thereof in the rotary shaft direction of the platen roller. <P>SOLUTION: The head holding mechanism includes the platen roller 3, a pair of bearings 5 annularly attached to the rotary shaft 3a at both ends of the platen roller 3, the head 9 holding image receiving paper and an ink sheet between the platen roller 3 and the head 9, a head mounting frame 7 on which the head 9 is mounted, a pair of head positioning plates 13 disposed on the head mounting frame 7 and abutting on the outer peripheral surfaces of the pair of bearings 5 from an upstream side in the image receiving paper conveying direction A, and an energizing means 11c energizing the head mounting frame 7 in the image receiving paper conveying direction A so that the abutting surface 13a of the head positioning plate 13 abuts on the outer peripheral surfaces of the bearings 5 from the upstream side in the image receiving paper conveying direction A. The abutting surface 13a of the head positioning plate 13 is formed in a knife edge shape, and a V-shaped groove 5a is provided to be recessed in the periphery direction on the outer peripheral surface of the bearing 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、印刷装置、複写装置等のヘッドを保持するヘッド保持機構に関する。   The present invention relates to a head holding mechanism that holds a head of a printing apparatus, a copying apparatus, or the like.

従来のヘッド保持機構には、従来例１として、ヘッド両側のヘッド位置決め板とプラテンローラ両側のベアリングとを確実に当接させるため、予圧ばねによりヘッド位置決め板を受像紙搬送方向に付勢することで、ヘッドのヒーターラインとプラテンローラの回転軸との平行度（即ちヘッドとプラテンローラとの受像紙搬送方向の相対位置精度、以下同様）を向上させるものがある（特許文献１）。   In the conventional head holding mechanism, as in Conventional Example 1, the head positioning plate is urged in the image receiving paper conveying direction by a preload spring in order to securely contact the head positioning plates on both sides of the head and the bearings on both sides of the platen roller. Thus, there is a technique that improves the parallelism between the heater line of the head and the rotation axis of the platen roller (that is, the relative positional accuracy of the head and the platen roller in the image receiving paper transport direction, the same applies hereinafter) (Patent Document 1).

また従来例２として、ヘッド両側の回動自在のガイドプレートをプラテンローラ両側のベアリングに回動付勢させることで、ヘッドのプラテンローラへの押圧の均一化やヘッドのヒーターラインとプラテンローラの回転軸との平行度を自己修正させるものがある（特許文献２）。   Further, as conventional example 2, by rotating and energizing the guide plates on both sides of the head to the bearings on both sides of the platen roller, the head is uniformly pressed against the platen roller and the head heater line and the platen roller are rotated. Some have self-correcting the parallelism with the axis (Patent Document 2).

また従来例３として、プラテンローラ両端の回動自在のヘッドオープンレバーをセットカバー前方両端の係止爪に係合させることで、ヘッドのヒーターラインとプラテンローラの回転軸との平行度を向上させるものがある（特許文献３）。   In addition, as a conventional example 3, the parallelism between the head heater line and the rotation axis of the platen roller is improved by engaging the rotatable head open levers at both ends of the platen roller with the locking claws at both ends of the front of the set cover. There is a thing (patent document 3).

また従来例４として、プラテンローラの回転軸とヘッド両側の位置決め軸とを側壁に設けられたＵ字溝に付勢させることで、ヘッドのヒーターラインとプラテンローラの回転軸との平行度を向上させるものがある（特許文献４）。   Also, as a conventional example 4, the parallelism between the head heater line and the rotation axis of the platen roller is improved by urging the rotation axis of the platen roller and the positioning shafts on both sides of the head against the U-shaped groove provided on the side wall. (Patent Document 4).

また従来例５として、プラテンローラ両側のテーパー状の軸受けが側壁のテーパー状の受容部分に着脱可能に係合したときに、プラテンローラと軸受けとの間の巻きバネにより軸受けが側壁側に付勢されることで、プラテンローラと側壁との相対位置精度を向上させるものがある（特許文献５）。   Further, as Conventional Example 5, when the tapered bearings on both sides of the platen roller are detachably engaged with the tapered receiving portion of the side wall, the bearing is biased to the side wall side by the winding spring between the platen roller and the bearing. As a result, there is one that improves the relative positional accuracy between the platen roller and the side wall (Patent Document 5).

また従来例６として、ヘッド両端に設けられた位置決め軸とプラテンローラ両側の軸受けに形成されたＶ溝とを係合させることで、ヘッドのヒーターラインとプラテンローラの回転軸との平行度を向上させるものがある（特許文献６，７）。   In addition, as a conventional example 6, the parallelism between the head heater line and the rotation axis of the platen roller is improved by engaging the positioning shafts provided at both ends of the head and the V grooves formed in the bearings on both sides of the platen roller. (Patent Documents 6 and 7).

また従来例７として、外周円筒面の軸方向中央部にＶ溝を備えた用紙位置決めローラと、Ｖ溝に突入可能な厚みを有する用紙押圧用ピンチローラとで用紙を狭持して用紙搬送を行うことで、薄く腰が弱い用紙と厚く越が強い用紙とに応じて用紙の搬送力を制御して、用紙位置決め精度を向上させるものがある（特許文献８）。   Further, as a conventional example 7, the paper is nipped between a paper positioning roller having a V-groove at the axial center of the outer peripheral cylindrical surface and a paper pressing pinch roller having a thickness that can be inserted into the V-groove to convey the paper. By doing so, there is one that improves the sheet positioning accuracy by controlling the sheet conveying force according to the thin and weak sheet and the thick and strong sheet (Patent Document 8).

特開平０５−１５５１００号公報（第３頁、第１図）Japanese Patent Laid-Open No. 05-155100 (page 3, FIG. 1) 特開平０５−３０９８５０号公報（第５頁、第１図）JP 05-309850 A (page 5, FIG. 1) 特開平０９−２２６２０５号公報（第７頁、第６図）JP 09-226205 A (page 7, FIG. 6) 特開２００２−１４４６１１号公報（第７−８頁、第６−８図）JP 2002-144611 (pages 7-8, 6-8) 特開２００３−１２７４４５号公報（第１３頁、第３図）Japanese Unexamined Patent Publication No. 2003-127445 (page 13, FIG. 3) 特開２０００−７１４８９号公報（第９頁、第８図）JP 2000-71489 A (page 9, FIG. 8) 特開２００１−１３８５５６号公報（第１０頁、第８図）JP 2001-138556 A (page 10, FIG. 8) 特開２００６−１６８８９３号公報（第１８頁、第５図）Japanese Patent Laying-Open No. 2006-168893 (page 18, FIG. 5)

しかしながら、上記の従来例１〜６では、いずれもヒーターラインとプラテンローラの回転軸との平行度（即ち受像紙搬送方向の相対位置精度）を向上させることはできるが、プラテンローラの回転軸方向の相対位置精度まで向上させることはできない。従って上記の従来例１〜６では、印字作業中のヘッドとプラテンローラとの相対位置（特にプラテンローラの回転軸方向の相対位置）のずれによる色ずれが生じるという問題点がある。   However, in each of the conventional examples 1 to 6, the parallelism between the heater line and the rotation axis of the platen roller (that is, the relative position accuracy in the image receiving paper conveyance direction) can be improved. It is not possible to improve the relative positional accuracy. Therefore, in the above conventional examples 1 to 6, there is a problem that a color shift occurs due to a shift in the relative position between the head and the platen roller during printing (particularly the relative position of the platen roller in the rotation axis direction).

また従来例７は、用紙位置決め精度を向上させるものであり、プラテンローラの回転軸方向の相対位置精度を向上させるものではない。従って従来例７でも、印字作業中のヘッドとプラテンローラとの相対位置（プラテンローラの回転軸方向の相対位置および受像紙搬送方向の相対位置）のずれによる色ずれが生じるという問題点がある。   Further, Conventional Example 7 improves the paper positioning accuracy, and does not improve the relative positional accuracy of the platen roller in the rotation axis direction. Therefore, even in the conventional example 7, there is a problem that color misregistration occurs due to misalignment of the relative position between the head and the platen roller during printing (the relative position in the rotation axis direction of the platen roller and the relative position in the image receiving paper transport direction).

この発明は、上記のような問題点を解決するためになされたものであり、ヘッドとプラテンローラとの受像紙搬送方向の相対位置精度だけでなく、プラテンローラの回転軸方向の相対位置精度も向上することで、印字作業中のヘッドとプラテンローラとの相対位置のずれによる色ずれを防止できるヘッド保持機構を提供することを目的としている。   The present invention has been made to solve the above-described problems. In addition to the relative positional accuracy of the head and the platen roller in the image receiving paper conveyance direction, the relative positional accuracy of the platen roller in the rotational axis direction is also improved. It is an object of the present invention to provide a head holding mechanism that can prevent color misregistration due to deviation in relative position between the head and the platen roller during the printing operation.

上記課題を解決する為に、本発明の第１の形態に係るヘッド保持機構は、プラテンローラと、前記プラテンローラの両端の回転軸に設けられた一対のベアリングと、前記プラテンローラとの間で受像紙およびインクシートを狭持するヘッドと、前記ヘッドが取り付けられたヘッド取付フレームと、前記ヘッド取付フレームに配設され、受像紙搬送方向の上流側から前記一対のベアリングの外周面に当接する一対のヘッド位置決め板と、前記ヘッド位置決め板の当接面が受像紙搬送方向の上流側から前記ベアリングの外周面に当接する様に、前記ヘッド取付フレームを受像紙搬送方向に付勢する付勢手段とを備え、前記ヘッド位置決め板の前記当接面がナイフエッジ状に形成され、前記ベアリングの外周面にその周方向にＶ字溝が凹設されるものである。   In order to solve the above problems, a head holding mechanism according to a first embodiment of the present invention includes a platen roller, a pair of bearings provided on rotation shafts at both ends of the platen roller, and the platen roller. A head that sandwiches the image receiving paper and the ink sheet, a head mounting frame to which the head is mounted, and a head mounting frame that is disposed on the head mounting frame and contacts the outer peripheral surfaces of the pair of bearings from the upstream side in the image receiving paper transport direction. A biasing force that urges the head mounting frame in the image receiving paper conveyance direction so that a pair of head positioning plates and the contact surface of the head positioning plate abut on the outer peripheral surface of the bearing from the upstream side in the image receiving paper conveyance direction And a contact surface of the head positioning plate is formed in a knife edge shape, and a V-shaped groove is recessed in the circumferential direction of the outer peripheral surface of the bearing. It is.

本発明の第１の形態によれば、ヘッド位置決め板の当接面がナイフエッジ状に形成され、ベアリングの外周面にその周方向にＶ字溝が凹設されているので、付勢手段によりヘッド取付フレームが受像紙搬送方向に付勢されることで、ヘッド位置決め板の当接面のナイフエッジ状の先端部がベアリングのＶ字溝の頂点に保持され、これによりヘッドとプラテンローラとの受像紙搬送方向の相対位置のずれだけでなく、ヘッドとプラテンローラとのプラテンローラの回転軸方向の相対位置のずれも防止される（従って相対位置精度を向上できる）。従って、印字作業中のヘッドとプラテンローラとの相対位置のずれによる色ずれを防止できる。   According to the first aspect of the present invention, the contact surface of the head positioning plate is formed in a knife edge shape, and the V-shaped groove is formed in the circumferential direction on the outer peripheral surface of the bearing. When the head mounting frame is urged in the image receiving paper conveying direction, the knife edge-shaped tip of the contact surface of the head positioning plate is held at the apex of the V-shaped groove of the bearing. In addition to the displacement of the relative position in the image receiving paper conveyance direction, the displacement of the relative position of the head and the platen roller in the direction of the rotation axis of the platen roller is prevented (thus, the relative position accuracy can be improved). Therefore, it is possible to prevent color misregistration due to the relative positional deviation between the head and the platen roller during printing.

実施の形態１．
この実施の形態に係るヘッド保持機構１は、図１および図２の様に、プラテンローラ３と、一対のベアリング５と、ヘッド取付フレーム７と、ヘッド９と、一対のヘッド位置決め板１３とを備えて主構成される。 Embodiment 1 FIG.
As shown in FIGS. 1 and 2, the head holding mechanism 1 according to this embodiment includes a platen roller 3, a pair of bearings 5, a head mounting frame 7, a head 9, and a pair of head positioning plates 13. Mainly composed in preparation.

プラテンローラ３は、円柱形状に形成されており、その両端にそれぞれ、その柱軸線に沿って回転軸３ａが突出形成されており、それら各回転軸３ａの外周面にそれぞれ、ベアリング５の位置決め用の位置決め部３ｂが径方向に凸設されている。それら各回転軸３ａの外周にはそれぞれ、位置決め部３ｂの外側に順にベアリング５、巻きバネ３ｃおよび回転軸３ａの先端側を軸支する軸受け３ｄが設けられている。   The platen roller 3 is formed in a columnar shape, and a rotary shaft 3a is projected from both ends of the platen roller 3 along its column axis. The bearing 5 is positioned on the outer peripheral surface of each rotary shaft 3a. The positioning portion 3b is projected in the radial direction. On the outer periphery of each of the rotary shafts 3a, a bearing 5d, a winding spring 3c, and a bearing 3d that pivotally supports the distal end side of the rotary shaft 3a are provided in order outside the positioning portion 3b.

このプラテンローラ３は、両端の軸受け３ｄが外枠フレーム等の支持部材１１ａに固定されることで、支持部材１１ａに対して回転自在に固定されている。この状態で、ベアリング５は、巻きバネ３ｃにより位置決め部３ｂ側に付勢されることで、位置決め部３ｂの位置に位置決めされている。   The platen roller 3 is rotatably fixed to the support member 11a by the bearings 3d at both ends being fixed to the support member 11a such as an outer frame. In this state, the bearing 5 is positioned at the position of the positioning portion 3b by being biased toward the positioning portion 3b by the winding spring 3c.

ベアリング５は、プラテンローラ３の両側の回転軸３ａの外周にそれぞれ回転自在に設けられており、その外周面にその周方向に断面Ｖ字状のＶ字溝５ａが凹設されている。   The bearing 5 is rotatably provided on the outer periphery of the rotating shaft 3a on both sides of the platen roller 3, and a V-shaped groove 5a having a V-shaped cross section is recessed in the outer circumferential surface thereof.

ヘッド取付フレーム７は、例えば矩形形状に形成されており、プラテンローラ３の上方において上下動自在且つ受像紙搬送方向Ａに沿って前後動自在に配置されている。またヘッド取付フレーム７には、その下面に、プラテンローラ３との間で受像紙およびインクシートを狭持するヘッド９が取り付けられており、またその両側面には、下方に突出して、その当接面１３ａが、受像紙搬送方向Ａの上流側からベアリング５の外周面のＶ字溝５ａに当接する一対のヘッド位置決め板１３が配設されている。   The head mounting frame 7 is formed in, for example, a rectangular shape, and is disposed above the platen roller 3 so as to be movable up and down and back and forth along the image receiving paper transport direction A. Further, the head mounting frame 7 has a head 9 attached to the lower surface of the head mounting frame 7 for sandwiching the image receiving paper and the ink sheet with the platen roller 3. A pair of head positioning plates 13 are provided in which the contact surface 13a comes into contact with the V-shaped groove 5a on the outer peripheral surface of the bearing 5 from the upstream side in the image receiving paper transport direction A.

またヘッド取付フレーム７には、その上面と上方配置された支持部材１１ｂとの間に、ヘッド取付フレーム７（従ってヘッド９）をプラテンローラ３側に付勢するための付勢手段（例えば巻きバネ）１５ａが配設されており、またその後面と後方配置された支持部材１１ｃとの間には、ヘッド位置決め板１３の当接面１３ａが受像紙搬送方向Ａの上流側からベアリング５の外周面のＶ字溝５ａに当接する様にヘッド取付フレーム７を受像紙搬送方向Ａに付勢するための付勢手段（例えば巻きバネ）１５ｂが配設されている。   The head mounting frame 7 has a biasing means (for example, a winding spring) for biasing the head mounting frame 7 (and hence the head 9) toward the platen roller 3 between the upper surface thereof and the support member 11b disposed above. ) 15a is disposed, and the contact surface 13a of the head positioning plate 13 is between the rear surface and the support member 11c disposed rearward, and the outer peripheral surface of the bearing 5 from the upstream side in the image receiving paper transport direction A. An urging means (for example, a winding spring) 15b for urging the head mounting frame 7 in the image receiving sheet conveyance direction A is provided so as to contact the V-shaped groove 5a.

またヘッド位置決め板１３の当接面１３ａは、ナイフエッジ状に形成されており、そのナイフエッジ状の先端部がベアリング５の外周面のＶ字溝５ａ内に当接する様になっている。これにより、付勢手段１５ｂによりヘッド取付フレーム７が受像紙搬送方向Ａに付勢されることで、図１０（ａ）〜（ｃ）の様に、ヘッド位置決め板１３の当接面１３ａのナイフエッジ状の先端部が、ベアリング５のＶ字溝５ａの内側面に沿ってＶ字の頂点に誘導されてその頂点に保持される。これにより、ヘッド９とプラテンローラ３との受像紙搬送方向Ａの相対位置のずれおよび回転軸３ａ方向の相対位置のずれが防止される。これにより、例えばヘッド支持アーム（不図示）が弾性変形してもヘッド９がプラテンローラ３に追随移動されてヘッド９とプラテンローラ３との相対位置のずれが常に防止される。   Further, the contact surface 13 a of the head positioning plate 13 is formed in a knife edge shape, and the tip portion of the knife edge shape is in contact with the V-shaped groove 5 a on the outer peripheral surface of the bearing 5. As a result, the head mounting frame 7 is urged in the image receiving paper transport direction A by the urging means 15b, whereby the knife on the contact surface 13a of the head positioning plate 13 as shown in FIGS. 10 (a) to 10 (c). The edge-shaped tip is guided to the V-shaped apex along the inner surface of the V-shaped groove 5a of the bearing 5 and held at the apex. This prevents the relative position shift between the head 9 and the platen roller 3 in the image receiving paper transport direction A and the relative position shift in the direction of the rotation shaft 3a. Thus, for example, even if a head support arm (not shown) is elastically deformed, the head 9 is moved following the platen roller 3 to always prevent the relative position between the head 9 and the platen roller 3 from shifting.

またヘッド９の下面には、インクシート１９のインクを受像紙１７に転写させるための発熱抵抗体の配置ライン（ヒーターライン）９ａが受像紙搬送方向Ａに直交する方向に形成されている。一対のヘッド位置決め板１３はそれぞれ、その当接面１３ａのナイフエッジ状の先端部とベアリング５の中心線との間の垂直距離Ｗ１が、その当接面１３ａのナイフエッジ状の先端部とヘッド９のヒーターライン９ａとの間の垂直距離Ｗ２と等しくなる様にヘッド取付フレーム７に配設されている。これにより付勢手段１５ａによりヘッド取付フレーム７がプラテンローラ３側に付勢されることで、プラテンローラ３により、受像紙１７およびインクシート１９がヘッド９のヒーターライン９ａに有効に押し当てられる様になる。   On the lower surface of the head 9, a heating resistor arrangement line (heater line) 9 a for transferring the ink on the ink sheet 19 to the image receiving paper 17 is formed in a direction orthogonal to the image receiving paper transport direction A. Each of the pair of head positioning plates 13 has a vertical distance W1 between the knife-edge tip of the contact surface 13a and the center line of the bearing 5, so that the knife-edge tip of the contact surface 13a and the head Nine heater lines 9a are arranged on the head mounting frame 7 so as to be equal to the vertical distance W2. As a result, the head mounting frame 7 is biased toward the platen roller 3 by the biasing means 15 a, so that the image receiving paper 17 and the ink sheet 19 are effectively pressed against the heater line 9 a of the head 9 by the platen roller 3. become.

次にこのヘッド保持機構１の動作を説明する。   Next, the operation of the head holding mechanism 1 will be described.

カラー印刷では、イエロー、マゼンタおよびシアンの３色を順に重ねて印刷することで、１画面の印刷が完了する。ここでは文字「Ａ」を印字する場合で説明する。尚、作図便宜上、イエローは３点破線で図示され、マゼンタは２点破線で図示され、シアンは１点破線で図示される。   In color printing, printing of one screen is completed by printing three colors of yellow, magenta, and cyan in order. Here, the case where the character “A” is printed will be described. For convenience of drawing, yellow is illustrated with a three-dot broken line, magenta is illustrated with a two-dot broken line, and cyan is illustrated with a one-dot broken line.

まず１色目（例えばイエロー）を印刷するには、図２の様に、プラテンローラ３とヘッド９との間に受像紙１７とイエロー用のインクシート１９とを重ねて合わせて配置し、それら受像紙１７およびインクシート１９をプラテンローラ３とヘッド９とで狭持させる。   First, in order to print the first color (for example, yellow), as shown in FIG. 2, the image receiving paper 17 and the yellow ink sheet 19 are overlapped and arranged between the platen roller 3 and the head 9, and these image receiving images are received. The paper 17 and the ink sheet 19 are held between the platen roller 3 and the head 9.

この状態では、付勢手段１５ｂによりヘッド取付フレーム７が受像紙搬送方向Ａに付勢されることで、図１０（ａ）〜（ｃ）の様に、ヘッド位置決め板１３の当接面１３ａのナイフエッジ状の先端部が、ベアリング５のＶ字溝５ａの内側面に沿ってＶ字の頂点に誘導されてその頂点に保持される。これにより、ヘッド９とプラテンローラ３との受像紙搬送方向Ａの相対位置のずれおよび回転軸３ａ方向の相対位置のずれが防止される。また付勢手段１５ａによりヘッド取付フレーム７がプラテンローラ３側に付勢されることで、プラテンローラ３により、受像紙１７およびインクシート１９がヘッド９のヒーターライン９ａに有効に押し当てられている。   In this state, the head mounting frame 7 is urged in the image receiving paper conveyance direction A by the urging means 15b, so that the contact surface 13a of the head positioning plate 13 is as shown in FIGS. 10 (a) to 10 (c). The knife edge-shaped tip is guided to the top of the V-shaped along the inner surface of the V-shaped groove 5a of the bearing 5 and held at the top. This prevents the relative position shift between the head 9 and the platen roller 3 in the image receiving paper transport direction A and the relative position shift in the direction of the rotation shaft 3a. Further, the head mounting frame 7 is urged toward the platen roller 3 by the urging means 15 a, whereby the image receiving paper 17 and the ink sheet 19 are effectively pressed against the heater line 9 a of the head 9 by the platen roller 3. .

そしてこの状態で、図３および図４の様に、ヘッド９のヒーターライン９ａが発熱された状態で、受像紙１７およびインクシート１９とが互いに同じ速さで（即ち互いにずれない様に）受像紙搬送方向Ａに搬送されると、受像紙１７の所定位置にイエローの色で文字「Ａ」が転写される。   In this state, as shown in FIGS. 3 and 4, the image receiving paper 17 and the ink sheet 19 are received at the same speed (that is, not shifted from each other) while the heater line 9a of the head 9 is heated. When transported in the paper transport direction A, the letter “A” is transferred in a yellow color to a predetermined position of the image receiving paper 17.

そして１色目のインクの転写が完了すると、ヘッド取付フレーム７が上方移動されてヘッド９とプラテンローラ３とによる受像紙１７およびインクシート１９の狭持が解除され、この状態で、図５の様に受像紙１７がＢ方向に移動されて元の印字開始位置まで戻されると共に、次の色（例えばマゼンタ）のインクシート１９がセットされる。   When the transfer of the first color ink is completed, the head mounting frame 7 is moved upward to release the holding of the image receiving paper 17 and the ink sheet 19 by the head 9 and the platen roller 3, and in this state, as shown in FIG. Then, the image receiving paper 17 is moved in the B direction and returned to the original print start position, and the ink sheet 19 of the next color (for example, magenta) is set.

そして図６の様に、イエローの場合と同様に、順にマゼンタおよびシアンの各色の文字「Ａ」が受像紙１７のイエローの文字「Ａ」上に重ねて転写されることで、受像紙１７上に文字「Ａ」が印字される。その際、受像紙１７はプラテンローラ３と密着しながら一体的に搬送されるので、上記の様にヘッド９とプラテンローラ３との受像紙搬送方向Ａの相対位置のずれおよび回転軸３ａ方向の相対位置のずれが防止されていることで、受像紙１７上に、各色の文字「Ａ」が図８の様に互いに受像紙搬送方向Ａにずれること無くまたは図９の様に互いに回転軸３ａ方向にずれること無く図７の様に正確に重なり合って、文字「Ａ」が印字される。この様にして文字「Ａ」が印字される。   Then, as in the case of yellow, the letter “A” of each color of magenta and cyan is sequentially transferred onto the yellow letter “A” of the image receiving paper 17 so as to be transferred onto the image receiving paper 17 as in the case of yellow. The letter “A” is printed on the screen. At that time, since the image receiving paper 17 is integrally conveyed while being in close contact with the platen roller 3, as described above, the relative position shift between the head 9 and the platen roller 3 in the image receiving paper conveying direction A and the direction of the rotation shaft 3a. Since the relative position is prevented from shifting, the letters “A” of the respective colors are not shifted from each other in the image receiving sheet conveying direction A as shown in FIG. The letter “A” is printed with overlapping exactly as shown in FIG. 7 without shifting in the direction. In this way, the letter “A” is printed.

以上の様に構成されたヘッド保持機構１によれば、ヘッド位置決め板１３の当接面１３ａがナイフエッジ状に形成され、ベアリング５の外周面にその周方向にＶ字溝５ａが凹設されているので、付勢手段１１ｃによりヘッド取付フレーム７が受像紙搬送方向Ａに付勢されることで、ヘッド位置決め板１３の当接面１３ａのナイフエッジ状の先端部がベアリング５のＶ字溝５ａの頂点に保持され、これによりヘッド９とプラテンローラ３との受像紙搬送方向Ａの相対位置のずれだけでなく、ヘッド９とプラテンローラ３とのプラテンローラ３の回転軸３ａ方向の相対位置のずれも防止できる（従って相対位置精度を向上できる）。従って、印字作業中のヘッド９とプラテンローラ３との相対位置のずれによる色ずれを防止できる。   According to the head holding mechanism 1 configured as described above, the contact surface 13a of the head positioning plate 13 is formed in a knife edge shape, and the V-shaped groove 5a is formed in the outer circumferential surface of the bearing 5 in the circumferential direction. Therefore, when the head mounting frame 7 is urged in the image receiving paper transport direction A by the urging means 11 c, the knife edge-shaped tip of the contact surface 13 a of the head positioning plate 13 becomes the V-shaped groove of the bearing 5. 5a, so that the relative position of the head 9 and the platen roller 3 in the image receiving paper transport direction A as well as the relative position of the head 9 and the platen roller 3 in the direction of the rotation axis 3a. Can also be prevented (therefore, the relative position accuracy can be improved). Therefore, it is possible to prevent color misregistration due to the relative positional deviation between the head 9 and the platen roller 3 during the printing operation.

またベアリング５が巻きバネ３ｃにより位置決め部３ｂ側に付勢されることで、ベアリング５が位置決め部３ｂの位置に位置決めされるので、プラテンローラ３とベアリング５との回転軸３ａ方向の相対位置のずれを防止できる。   Further, since the bearing 5 is urged toward the positioning portion 3b by the winding spring 3c, the bearing 5 is positioned at the position of the positioning portion 3b. Therefore, the relative position of the platen roller 3 and the bearing 5 in the direction of the rotating shaft 3a is changed. Misalignment can be prevented.

またヘッド位置決め板１３の当接面１３ａとベアリング５の中心線との間の垂直距離Ｗ１が、ヘッド位置決め板１３の当接面１３ａとヘッド９のヒーターライン９ａとの間の垂直距離Ｗ２と等しいので、プラテンローラ３により、受像紙１７およびインクシート１９がヘッド９のヒーターライン９ａに有効に押し当てられる様になる。   The vertical distance W1 between the contact surface 13a of the head positioning plate 13 and the center line of the bearing 5 is equal to the vertical distance W2 between the contact surface 13a of the head positioning plate 13 and the heater line 9a of the head 9. Therefore, the image receiving paper 17 and the ink sheet 19 are effectively pressed against the heater line 9 a of the head 9 by the platen roller 3.

この発明の適用例として、受像紙に染料を転写して画像を形成する染料熱転写方式のプリンタのサーマルヘッドのヘッド保持機構に適用できる。   As an application example of the present invention, the present invention can be applied to a head holding mechanism of a thermal head of a dye thermal transfer printer that forms an image by transferring a dye to an image receiving paper.

実施の形態１に係るヘッド保持機構の底面視図である。3 is a bottom view of the head holding mechanism according to Embodiment 1. FIG. 図１のII-II断面図である。It is II-II sectional drawing of FIG. イエローの印字状態を示す底面透視図である。It is a bottom perspective figure which shows the printing state of yellow. イエローの印字後の受像紙戻し状態を示す底面透視図である。FIG. 6 is a bottom perspective view showing a state in which the image receiving paper is returned after printing yellow. 受像紙のマゼンタの印字開始位置を示す底面透視図である。FIG. 6 is a bottom perspective view illustrating a print start position of magenta on an image receiving paper. マゼンターの印字状態を示す底面透視図である。It is a bottom perspective view showing the printing state of magenta. 印字ずれの無い正常な印字結果を示す図である。It is a figure which shows the normal printing result without a printing shift. 受像紙搬送方向の印字ずれを示す図である。FIG. 6 is a diagram illustrating a printing deviation in the image receiving paper conveyance direction. プラテンローラの回転軸方向の印字ずれを示す図である。It is a figure which shows the printing shift | offset | difference of the rotation axis direction of a platen roller. （ａ）は、ヘッド位置決め板が受像紙搬送方向に移動する状態を示した図であり、（ｂ）は、ヘッド位置決め板の当接面のエッジナイフ状の先端部がベアリングの外周面のＶ字溝の内側面に沿ってＶ字の頂点に誘導される状態を示した図であり、（ｃ）は、ヘッド位置決め板の当接面のエッジナイフ状の先端部がベアリングの外周面のＶ字溝の頂点に保持された状態を示した図である。(A) is the figure which showed the state which a head positioning plate moves to an image receiving paper conveyance direction, (b) is the edge knife-shaped front-end | tip part of the contact surface of a head positioning plate, and V of the outer peripheral surface of a bearing. It is the figure which showed the state induced | guided | derived to the vertex of V shape along the inner surface of a groove | channel, (c) is the edge knife-shaped front-end | tip part of the contact surface of a head positioning plate. It is the figure which showed the state hold | maintained at the vertex of the character groove.

符号の説明Explanation of symbols

１ ヘッド保持機構、３ プラテンローラ、３ａ 回転軸、３ｂ ベアリング用の位置決め部、３ｃ 巻きバネ、３ｄ 軸受け、５ ベアリング、５ａ Ｖ字溝、７ ヘッド取付フレーム、９ ヘッド、１１ａ，１１ｂ 支持部材、３ ヘッド位置決め板、１３ａ 当接面、１５ａ，１５ｂ 付勢手段、１７ 受像紙、１９ インクシート、Ａ 受像紙搬送方向。   DESCRIPTION OF SYMBOLS 1 Head holding mechanism, 3 Platen roller, 3a Rotating shaft, 3b Bearing positioning part, 3c Winding spring, 3d Bearing, 5 Bearing, 5a V-shaped groove, 7 Head mounting frame, 9 Head, 11a, 11b Support member, 3 Head positioning plate, 13a contact surface, 15a, 15b urging means, 17 image receiving paper, 19 ink sheet, A image receiving paper conveyance direction.

Claims (3)

プラテンローラと、
前記プラテンローラの両端の回転軸に設けられた一対のベアリングと、
前記プラテンローラとの間で受像紙およびインクシートを狭持するヘッドと、
前記ヘッドが取り付けられたヘッド取付フレームと、
前記ヘッド取付フレームに配設され、受像紙搬送方向の上流側から前記一対のベアリングの外周面に当接する一対のヘッド位置決め板と、
前記ヘッド位置決め板の当接面が受像紙搬送方向の上流側から前記ベアリングの外周面に当接する様に、前記ヘッド取付フレームを受像紙搬送方向に付勢する付勢手段とを備え、
前記ヘッド位置決め板の前記当接面がナイフエッジ状に形成され、前記ベアリングの外周面にその周方向にＶ字溝が凹設されることを特徴とするヘッド保持機構。 A platen roller,
A pair of bearings provided on the rotating shafts at both ends of the platen roller;
A head for sandwiching the image receiving paper and the ink sheet with the platen roller;
A head mounting frame to which the head is mounted;
A pair of head positioning plates disposed on the head mounting frame and in contact with the outer peripheral surfaces of the pair of bearings from the upstream side in the image receiving paper conveyance direction;
Urging means for urging the head mounting frame in the image receiving paper conveyance direction so that the contact surface of the head positioning plate abuts on the outer peripheral surface of the bearing from the upstream side in the image receiving paper conveyance direction;
The head holding mechanism, wherein the contact surface of the head positioning plate is formed in a knife edge shape, and a V-shaped groove is provided in the circumferential direction on the outer peripheral surface of the bearing. 前記プラテンローラの両端の前記回転軸の外周面にそれぞれ、前記ベアリングの位置決め用の位置決め部が径方向に凸設され、その位置決め部の外側に前記ベアリングが設けられ、
前記プラテンローラの両端の前記回転軸の先端側を軸支する軸受けと、
前記回転軸における前記ベアリングと前記軸受けとの間に設けられ、前記ベアリングを前記位置決め部側に付勢する巻きバネと、
を更に備えることを特徴とする請求項１に記載のヘッド保持機構。 Positioning portions for positioning the bearings are radially provided on the outer peripheral surfaces of the rotating shafts at both ends of the platen roller, and the bearings are provided outside the positioning portions,
A bearing that pivotally supports the tip side of the rotating shaft at both ends of the platen roller;
A winding spring provided between the bearing and the bearing in the rotating shaft and biasing the bearing toward the positioning portion;
The head holding mechanism according to claim 1, further comprising: 前記ヘッド位置決め板の前記当接面と前記ベアリングの中心線との間の垂直距離が、前記ヘッド位置決め板の前記当接面と前記ヘッドにおける前記インクシートのインクを前記受像紙に転写させるためのヒーターラインとの間の垂直距離と等しいことを特徴とする請求項１に記載のヘッド保持機構。   The vertical distance between the contact surface of the head positioning plate and the center line of the bearing is for transferring ink of the ink sheet in the head positioning plate and the head to the image receiving paper. The head holding mechanism according to claim 1, wherein the head holding mechanism is equal to a vertical distance to the heater line.
JP2007235144A 2007-09-11 2007-09-11 Head holding mechanism Pending JP2009066801A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011183610A (en) * 2010-03-05 2011-09-22 Toshiba Tec Corp Printing unit and printing apparatus

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JPH03292154A (en) * 1990-04-09 1991-12-24 Seiko Instr Inc Image outputting device
JPH04197670A (en) * 1990-11-28 1992-07-17 Seiko Instr Inc Thermal head positioning mechanism
JPH05155100A (en) * 1991-12-04 1993-06-22 Seiko Instr Inc Mechanism for retaining thermal head
JPH10250122A (en) * 1997-03-18 1998-09-22 Fuji Photo Film Co Ltd Thermal printer
JP2003200601A (en) * 2001-12-28 2003-07-15 Nidec Copal Corp Method of manufacturing printer and printer

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Publication number Priority date Publication date Assignee Title
JPS61179769A (en) * 1985-02-06 1986-08-12 Hitachi Ltd Thermal printer
JPH03292154A (en) * 1990-04-09 1991-12-24 Seiko Instr Inc Image outputting device
JPH04197670A (en) * 1990-11-28 1992-07-17 Seiko Instr Inc Thermal head positioning mechanism
JPH05155100A (en) * 1991-12-04 1993-06-22 Seiko Instr Inc Mechanism for retaining thermal head
JPH10250122A (en) * 1997-03-18 1998-09-22 Fuji Photo Film Co Ltd Thermal printer
JP2003200601A (en) * 2001-12-28 2003-07-15 Nidec Copal Corp Method of manufacturing printer and printer

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JP2011183610A (en) * 2010-03-05 2011-09-22 Toshiba Tec Corp Printing unit and printing apparatus

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