JPS63286374A - Thermal transfer printer - Google Patents

Thermal transfer printer

Info

Publication number
JPS63286374A
JPS63286374A JP12204887A JP12204887A JPS63286374A JP S63286374 A JPS63286374 A JP S63286374A JP 12204887 A JP12204887 A JP 12204887A JP 12204887 A JP12204887 A JP 12204887A JP S63286374 A JPS63286374 A JP S63286374A
Authority
JP
Japan
Prior art keywords
platen
paper
pinch roller
way clutch
feed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP12204887A
Other languages
Japanese (ja)
Inventor
Saburo Kariya
仮屋 三郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP12204887A priority Critical patent/JPS63286374A/en
Publication of JPS63286374A publication Critical patent/JPS63286374A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J15/00Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in continuous form, e.g. webs
    • B41J15/16Means for tensioning or winding the web

Landscapes

  • Handling Of Sheets (AREA)

Abstract

PURPOSE:To prevent color shift due to superimposed printing through secure paper feed and paper floating prevention by constituting a mechanism with a one-way clutch on a delivery side which becomes engaged only for normal feed and a one-way clutch on a feed side which becomes engaged only for reversed feed. CONSTITUTION:When a platen 1 is rotated in an arrow X direction to feed printing paper 12 in a normal feed direction, i.e. the arrow Y direction, a pinch roller 7 on a delivery side becomes engaged with a one-way clutch 9b which is forcibly inserted into a pin roller gear 8b, and is forcibly driven by rotation of the platen 1. A pinch roller 6 on a feed side is set to an idling state by the one-way clutch 9 inserted forcibly in a pinch roller gear 8, and paper is fed securely by the pinch roller 7 which is a roller on the delivery side. This does not allow printing paper 12 on the platen 1 to become afloat.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は、印字中は印字ヘッドをプラテンに押し付は熱
転写インクリボンを介して印字用紙に印字を行うライン
ヘッドを搭載する熱転写プリンタに関し、特にカラー印
字のため印字用紙を複数回往復させてインクリボンの重
ね印字を行う熱転写プリンタに関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a thermal transfer printer equipped with a line head that presses the print head against a platen during printing and prints on printing paper via a thermal transfer ink ribbon. In particular, the present invention relates to a thermal transfer printer that performs overprinting of ink ribbons by reciprocating printing paper multiple times for color printing.

[従来の技術] 従来、この種の熱転写プリンタにおいては、印字ヘッド
圧力による適正なニップ幅を得るためにプラテンを軟硬
度の材質を選択する必要がありまた、ある種の色を印字
するためにはインクリボンに設けられた基本色の重ね印
字を行う必要がある。
[Prior Art] Conventionally, in this type of thermal transfer printer, it was necessary to select a material with soft hardness for the platen in order to obtain an appropriate nip width based on the print head pressure, and in order to print a certain color, It is necessary to perform overlapping printing of the basic colors provided on the ink ribbon.

このため、−色の印字完了後、プラテンを逆転させてプ
ラテンに噛み込まれた印字済用紙をバックさせ、次の色
を重ね合せる必要があり、その際前の印字色と次の印字
色とは完全に一致させる必要がある。
Therefore, after printing of the - color is completed, it is necessary to reverse the platen to back up the printed paper caught in the platen and to overlap the next color. must match exactly.

[解決すべき問題点] 、 上述した従来の熱転写プリンタにあっては、用紙送
り用プラテンが軟材質のため、プラテン圧力およびプラ
テンをはさみ込むように実装されたピンチローラ圧力に
よりプラテンにたわみが発生し、所定の回転数プラテン
を回しても規定量だけ用紙が送りきれないことがあった
。また、プラテンと前後2本のピンチローラ間に用紙す
べり量の誤差が発生し排出側ピンチローラおよび吸入側
ピンチローラ間で用紙送り量が異なり用紙が浮いてしま
う現象が生じていた。そして、これらの現象によって前
回印字と次回印字の重ねが正常に行われず色ズレが生じ
るといった欠点があった。
[Problems to be solved] In the above-mentioned conventional thermal transfer printer, the paper feeding platen is made of a soft material, so the platen is deflected by the pressure of the platen and the pressure of the pinch rollers mounted to sandwich the platen. Even if the platen was rotated at a predetermined number of rotations, the paper could not be fed by the specified amount. Furthermore, an error occurs in the amount of paper sliding between the platen and the two front and rear pinch rollers, and the paper feed amount differs between the ejection-side pinch roller and the suction-side pinch roller, causing the paper to float. Furthermore, due to these phenomena, there is a drawback that the previous printing and the next printing are not properly overlapped, resulting in color misregistration.

[問題点の解決手段] 上記従来の問題点を解決する本発明は、多色のインクゾ
ーンを保有するインクリボンインクの重ね合せにより多
色印字を表現するラインヘッドを搭載する熱転写プリン
タにおいて、プラテンの用紙繰出し側と排出側に配置さ
れた2本の用紙送りピンチローラに上記プラテンの軸に
設けたプラテンギヤと噛合するピンチローラギヤを各々
設け、かつ上記各ピンチローラとピンチローラギヤ間に
各々ワンウェイクラッチを設けると共に、上記排出側の
ワンウェイクラッチは順方向送りでのみ噛合い、上記繰
出し側のワンウェイクラッチは逆方向送りでのみ噛合う
ように構成してなる。
[Means for Solving Problems] The present invention solves the above-mentioned conventional problems in a thermal transfer printer equipped with a line head that expresses multicolor printing by overlapping ink ribbons having multicolor ink zones. The two paper feed pinch rollers disposed on the paper feeding side and the paper ejection side are each provided with a pinch roller gear that meshes with a platen gear provided on the shaft of the platen, and a one-way clutch is provided between each of the pinch rollers and the pinch roller gear. In addition, the one-way clutch on the ejection side is configured to engage only in forward direction feeding, and the one-way clutch on the feeding side is configured to engage only in reverse direction feeding.

[実施例] 以下、本発明の一実施例について図面を参照して詳細に
説明する。
[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

第1図は本発明の一実施例を示す平面図、第2図は第1
図の縦断面図である。第1図、第2図において、プラテ
ン1は図示しない駆動源よりタイミングベルト2および
タイミングプーリ3を介して正転および逆転を行う。プ
ラテン1はさらに両端を軸受4a、4bにより支持され
、一端のプラテンギヤ5を介して吸入側ピンチローラ6
、排出側ピンチローラ7をギヤ駆動する。ピンチローラ
ギヤ8a、8bは内部にワンウェイクラッチ9a、9b
が圧入されており、それぞれ噛合い方向が逆になるよう
圧入方向が異なっている。ピンチローラ6.7は、それ
ぞれピンチローラ軸受10a、10bで支持され、それ
ぞれプレッシャスプリングlla、llbによりプラテ
ン1に用紙送りに適正な圧力で押し付けられている。
Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
FIG. In FIGS. 1 and 2, a platen 1 is rotated forward and backward by a drive source (not shown) via a timing belt 2 and a timing pulley 3. As shown in FIG. The platen 1 is further supported at both ends by bearings 4a and 4b, and is connected to a suction side pinch roller 6 via a platen gear 5 at one end.
, the discharge side pinch roller 7 is gear driven. Pinch roller gears 8a, 8b have one-way clutches 9a, 9b inside.
are press-fitted, and the press-fitting directions are different so that the meshing directions are opposite to each other. The pinch rollers 6.7 are supported by pinch roller bearings 10a and 10b, respectively, and are pressed against the platen 1 by pressure springs lla and llb, respectively, with appropriate pressure for sheet feeding.

印字用紙12は、用紙ガイド13.14により案内され
プラテン1に正常に供給される構造となフている。印字
ヘッド15は支持体16に固定されて粘り回転輪17を
中心に揺動可能となっている。印字中は、この印字ヘッ
ド15をプラテン1に押し付け、カラーインクリボン1
8を介して印字を行い、印字用紙12のフォワード退行
およびカラーインクリボン18のリボン送行時は印字ヘ
ッド15をプラテン1より解放する。
The printing paper 12 is guided by paper guides 13, 14 and is normally fed to the platen 1. The print head 15 is fixed to a support 16 and is able to swing around a sticky rotary wheel 17. During printing, this print head 15 is pressed against the platen 1, and the color ink ribbon 1
8, and the print head 15 is released from the platen 1 when the print paper 12 moves forward and the color ink ribbon 18 moves forward.

次に本発明の動作について説明する。Next, the operation of the present invention will be explained.

プラテン1を矢印X方向に回転させ印字用紙12を順方
向の矢印Y方向に送り出すとき、排出側のピンチローラ
7はピンチローラギヤ8bの内部に圧入されたワンウェ
イクラッチ9bと係合しプラテン1の回転により強制駆
動される。このため印字用紙12の引張り力は、プラテ
ン1と印字用紙12、印字用紙12とピンチローラ7の
合力となり、繰出し側のピンチローラ6による引張り力
よりも大きくなる。このことは印字用紙12と、プラテ
ン!のすべり発生が微少となり、繰出し側より確実に印
字用紙12が送り出される。
When the platen 1 is rotated in the direction of the arrow X and the print paper 12 is sent out in the forward direction of the arrow Y, the pinch roller 7 on the discharge side engages with the one-way clutch 9b press-fitted into the pinch roller gear 8b, and the platen 1 Forcibly driven by rotation. Therefore, the tensile force of the printing paper 12 is the resultant force of the platen 1 and the printing paper 12, the printing paper 12 and the pinch roller 7, and is larger than the tensile force of the pinch roller 6 on the feeding side. This means that the printing paper 12 and the platen! The occurrence of slippage is minimized, and the printing paper 12 is reliably fed out from the feeding side.

さらにこのとき、繰出し側のピンチローラ6は、ピンチ
ローラギヤ8の内部に圧入されたワンウェイクラッチ9
により空転状態となっており、かつ排出側ローラである
ピンチローラ7による用紙送りが確実になされるため、
プラテン!上で印字用紙12が浮くことはない。
Furthermore, at this time, the pinch roller 6 on the feeding side is connected to the one-way clutch 9 press-fitted inside the pinch roller gear 8.
Since the paper is in an idling state and the paper is fed reliably by the pinch roller 7, which is the discharge side roller,
Platen! The printing paper 12 will not float above it.

次に、重ね印字を行うため印字用紙12をフォワード方
向へ戻すときは、前記と逆にプラテン1を逆転させる。
Next, when returning the printing paper 12 in the forward direction to perform overlapping printing, the platen 1 is reversed in the opposite direction.

プラテン1が逆転すると、繰出し側のピンチローラ6の
ワンウェイクラッチ9aが係合しプラテンギヤ5とピン
チローラギヤ8aの噛合いによりピンチローラ6が強制
駆動される。また、ピンチローラ7のワンウェイクラッ
チ8bは空転状態となる。従って、上記した順方向への
送り出しの場合と同様に印字用紙!2の逆方向送りが確
実に行われることとなる。
When the platen 1 is reversed, the one-way clutch 9a of the pinch roller 6 on the feeding side is engaged, and the pinch roller 6 is forcibly driven by the engagement between the platen gear 5 and the pinch roller gear 8a. Further, the one-way clutch 8b of the pinch roller 7 is in an idle state. Therefore, as in the case of forward feeding described above, the printing paper! 2, the reverse direction feeding will be performed reliably.

よって、順方向、逆方向に関係なく用紙浮きが良好に防
止され、重ね印字による色ズレをなくすことができる。
Therefore, regardless of the forward direction or the reverse direction, paper floating can be effectively prevented, and color misregistration due to overlapping printing can be eliminated.

[発明の効果] 以上説明したように本発明は、プラテンと用紙繰出し側
及び排出側に配置された2本のピンチローラをピンチロ
ーラギヤとプラテンギヤと係合させて強制駆動し、さら
にピンチローラおよびピンチローラギヤ間にワンウェイ
クラッチを内蔵することにより、用紙送りおよび用紙浮
き防止を確実に行い、重ね印字による色ズレを防止する
効果がある。
[Effects of the Invention] As explained above, the present invention engages the pinch roller gear and the platen gear to forcibly drive the two pinch rollers disposed on the platen and the paper feeding side and the paper ejection side, and furthermore, the pinch rollers and the By incorporating a one-way clutch between the pinch roller gears, paper feeding and paper floating prevention are reliably performed, and color shift due to overprinting is prevented.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例に係る熱転写プリンタの平面
図、第2図は第1図における縦断面図である。 1ニブラテン 5ニブラテンギヤ 6.7=ピンチローラ 8a、8b:ピンチローラギヤ 9a、9b:ワンウェイクラッチ 12:印字用紙 15:印字ヘッド 18:カラーインクリボン
FIG. 1 is a plan view of a thermal transfer printer according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of FIG. 1. 1 Nibraten 5 Nibraten gear 6.7 = Pinch rollers 8a, 8b: Pinch roller gears 9a, 9b: One-way clutch 12: Print paper 15: Print head 18: Color ink ribbon

Claims (1)

【特許請求の範囲】[Claims] 多色のインクゾーンを保有するインクリボンインクの重
ね合せにより多色印字を表現するラインヘッドを搭載す
る熱転写プリンタにおいて、プラテンの用紙繰出し側と
排出側に配置された2本の用紙送りピンチローラに上記
プラテンの軸に設けたプラテンギヤと噛合するピンチロ
ーラギヤを各々設け、かつ上記各ピンチローラとピンチ
ローラギヤ間に各々ワンウェイクラッチを設けると共に
、上記排出側のワンウェイクラッチは順方向送りでのみ
噛合い、上記繰出し側のワンウェイクラッチは逆方向送
りでのみ噛合うことを特徴とする熱転写プリンタ。
In a thermal transfer printer equipped with a line head that expresses multicolor printing by overlapping ink ribbons with multicolor ink zones, the above-mentioned paper feed pinch rollers are placed on the paper feed side and ejection side of the platen. Each pinch roller gear is provided to mesh with a platen gear provided on the shaft of the platen, and a one-way clutch is provided between each of the pinch rollers and the pinch roller gear, and the one-way clutch on the discharge side is engaged only in forward direction feeding, A thermal transfer printer characterized in that the one-way clutch on the feeding side is engaged only when feeding in the reverse direction.
JP12204887A 1987-05-19 1987-05-19 Thermal transfer printer Pending JPS63286374A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12204887A JPS63286374A (en) 1987-05-19 1987-05-19 Thermal transfer printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12204887A JPS63286374A (en) 1987-05-19 1987-05-19 Thermal transfer printer

Publications (1)

Publication Number Publication Date
JPS63286374A true JPS63286374A (en) 1988-11-24

Family

ID=14826316

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12204887A Pending JPS63286374A (en) 1987-05-19 1987-05-19 Thermal transfer printer

Country Status (1)

Country Link
JP (1) JPS63286374A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5898452A (en) * 1993-03-08 1999-04-27 Japan Servo Co., Ltd. Thermal transfer color recording device
US5980132A (en) * 1993-03-31 1999-11-09 Canon Kabushiki Kaisha Image forming apparatus with means for maintaining constant distance between recording head and recording sheet

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5898452A (en) * 1993-03-08 1999-04-27 Japan Servo Co., Ltd. Thermal transfer color recording device
US5980132A (en) * 1993-03-31 1999-11-09 Canon Kabushiki Kaisha Image forming apparatus with means for maintaining constant distance between recording head and recording sheet

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