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JP3832715B2 - Continuous paper printer - Google Patents

Continuous paper printer Download PDF

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Publication number
JP3832715B2
JP3832715B2 JP2000320385A JP2000320385A JP3832715B2 JP 3832715 B2 JP3832715 B2 JP 3832715B2 JP 2000320385 A JP2000320385 A JP 2000320385A JP 2000320385 A JP2000320385 A JP 2000320385A JP 3832715 B2 JP3832715 B2 JP 3832715B2
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JP
Japan
Prior art keywords
paper
tractor
conveyance
puller
continuous
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.)
Expired - Fee Related
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JP2000320385A
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Japanese (ja)
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JP2002128343A (en
Inventor
秀俊 高山
信冶 永山
勝 河本
嘉彦 佐野
Original Assignee
リコープリンティングシステムズ株式会社
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Priority to JP2000320385A priority Critical patent/JP3832715B2/en
Publication of JP2002128343A publication Critical patent/JP2002128343A/en
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  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、連続紙に画像を形成する連続紙印刷装置に関するものである。
【0002】
【従来の技術】
ここでは、従来技術として、連続紙を用いた電子写真印刷装置を例としてあげる。
【0003】
図2に従来装置の搬送プラーの概略を示す。
【0004】
搬送プラーは図2(b)に示す通り、円筒の形状を成したローラ31と、凸型の形状を成すローラ32を1対としシャフト33に1対を成したロ−ラが複数挿入され、シャフト33はステッピングモ−タ34より回転動作を受けている。ロ−ラ32はシャフト33に取り付けられているのでシャフト33の回転と同速で回転する。
【0005】
図2(a)に示す通り、ロ−ラ31はロ−ラ32に挿入しているのでロ−ラ32と接触する面から回転作用を受けながらロ−ラ31は回転動作をし、用紙1に張力を与えている。
【0006】
図3に従来装置の搬送プラーの動作シーケンスを示す。
【0007】
上位装置より用紙搬送開始指示が送信されると搬送プラー2を用紙搬送方向とは逆方向に回転させ用紙1に張力を与えた後にトラクタ10の用紙搬送動作が開始し、上位装置より用紙搬送終了指示が送信されると用紙を所定量搬送し、次の印字の書き出し位置を合わせるために印刷中の用紙搬送方向と逆方向にトラクタ10を所定量動作後に停止させ、搬送プラー2を停止する動作シーケンスとしている。
【0008】
【発明が解決しようとする課題】
従来技術では、搬送プラーを構成し用紙に張力を与える複数のローラは、各々形状が厳密には同一ではく、又回転速度も同速ではないので搬送プラーが回転中に各々のローラが用紙に与える張力に変動が生じていた。用紙のほぼ両端部に与える張力が左右不均一の場合、トラクタが用紙搬送中、用紙が蛇行し、用紙の両端部に設けてある送り穴がトラクタの両端部に設けたピンから外れ、連続印刷が停止するなどの課題があった。特に用紙幅の広い用紙を搬送中、搬送プラーを構成する複数のローラと接触する員数は、用紙幅の広い用紙のほうが用紙幅の狭い用紙よりも多いので発生頻度が多かった。又用紙の蛇行によってトラクタのピンから外れない場合であっても僅かな用紙の蛇行により用紙に転写されるトナー像が崩れた文字ぶれと言う印刷品質に影響を及ぼす課題もある。
【0009】
本発明では、部品を変更及び追加することなく用紙送り制御方式を工夫するだけで用紙幅の広い連続用紙にて上記課題を解決することを目的とする。
【0010】
【課題を解決するための手段】
上記目的は、連続紙に画像を形成する画像形成手段と、連続紙を搬送するトラクタと、該トラクタに対し用紙搬送方向上流側に配置された搬送プラーとを備えた連続紙印刷装置において、前記トラクタに装着された連続紙の用紙幅を認知する用紙幅認知手段と、前記用紙幅認知手段が、前記トラクタに装着された連続紙が所定の用紙幅よりも広い用紙幅を有すると認識したときは、前記トラクタによる用紙搬送開始前に前記搬送プラーを用紙搬送方向とは逆方向に回転させ、前記トラクタによる用紙搬送開始に伴い前記搬送プラーの回転を停止させる制御を実行し、前記用紙幅認知手段が、前記トラクタに装着された連続紙が所定の用紙幅以下の用紙幅を有すると認識したときは、前記トラクタによる用紙搬送開始前に前記搬送プラーを用紙搬送方向とは逆方向に回転させるとともに、前記トラクタによる用紙搬送開始後も前記搬送プラーの回転を継続させる制御を実行する制御手段とを備えたことにより達成される。
【0011】
【発明の実施の形態】
本発明の実施例を図1を用いて説明する。なお、構成において従来技術と同一のものは、図2〜3の番号を用いている。
【0012】
電子写真装置の概略構成を図4に示し印刷動作の原理を説明する。
【0013】
用紙1は、長尺状に連続した連続紙であり両縁部には用紙搬送方向に沿って所定間隔で送り穴(図示せず)が形成されており、送り穴は主としてトラクタ10による搬送のために用いられている。又、トラクタ10の両端側には、用紙を搬送させるためにピン20が複数設けられておりピン20の間隔は送り穴の所定間隔と一致している。
【0014】
ホッパ17に用紙1を設置し、トラクタ10のピン20と連続紙1の送り穴が合うよう用紙の先端をトラクタ9に装着させる。図示しない用紙送りスイッチを押下することによりモータ16が回転し搬送プラー2が用紙搬送方向とは逆向きに回転動作し、モータ15が回転するとトラクタ10が動作し用紙を搬送する。用紙1の先端は、トラクタ10、バッファ11を通過する。加熱ロール12と加圧ロール13は開放状態であり、用紙1の先端は加熱ロール12と加圧ロール13の間を通過し定着プラー14に搬送されスウィングフィン15の揺動動作を受けながら順次スタッカ19へ排出する。印字書き出し位置が正常となるよう本装置は用紙1の搬送制御を終了し印刷動作の待機状態となる。
【0015】
以上の一連の動作が用紙装填動作であり以下に本装置のトナー像を記録形成するプロセス及び印刷動作の概略を説明する。
【0016】
図示しない上位装置(主にコンピュータ装置)からネットワークなどを含む接続手段(図示せず)を通して印刷開始信号が送信されると、用紙搬送方向に回転している感光ドラム5は、帯電器より所定電位に均一に帯電され、上位装置から送信される印字情報を露光装置9にて照射ビームを放射させ、照射ビームを受けた感光ドラム5には静電潜像が形成され、現像機3にて負に帯電した黒トナーが反転現像される。現像領域に達した静電潜像にはトナーが供給され静電潜像はトナー像として可視化される。感光ドラム5表面に形成されたトナー像は転写器4と対向する位置に運ばれる。トラクタ10によって搬送される用紙1は、転写器4の前を一定速度で走行し、リトラクタ6により感光ドラム5へ押し付けられている。転写器4の前に運ばれたトナー像は転写器4によって転写領域にて用紙1に転写される。また、用紙1が感光ドラム5に巻き付くことを防ぐこと及び用紙1が蛇行せずにトナー像を用紙1に転写させるために搬送プラー2は、用紙搬送方向とは逆方向に回転し用紙1に張力を与えている。転写領域で転写されずに感光ドラム5の表面に残留したトナーは、クリーナ7によって感光ドラム5の表面より除去される。
【0017】
一方、印刷動作中は、加熱ロール12と加圧ロール13が閉じた圧接状態である。トナー像を転写された用紙1は、トラクタ10とバッファ11を通り加熱ロール12と加圧ロール13が圧接した加圧点より、加熱加圧作用を受けながら挟持搬送され、転写されたトナー像は用紙1に定着される。定着された用紙1は、定着プラー14に搬送されスタッカ19へ順次排出される。又上位装置より印刷停止信号が送信されると、本装置は印刷終了動作へ移行し印刷待機状態となる。
【0018】
図1は本発明の一実施例である用紙搬送時の制御方式のタイムチャートを示している。タイムチャート上の1は有効(信号有り)、0は無効を示す。用紙搬送方向と同方向の場合は正の極性、逆方向は負の極性とする。
【0019】
用紙幅がA(inch)よりも広い用紙幅であるB(inch)の用紙(以下用紙Bとする。)をトラクタ10に装着させる。この時、用紙幅を認知する手段(例えば用紙幅を検出する手段やオペレータからの用紙幅データ入力など)により用紙幅がA(inch)より広い用紙幅であることを本装置は認識する。自動装填終了後、上位装置より印刷開始指示を受け、用紙Bであった場合、用紙搬送前の状態では搬送プラー2を用紙搬送方向とは逆回転させ、トラクタ10が用紙Bを搬送する時搬送プラー2を停止させる。用紙搬送中、搬送プラーは用紙1から回転作用を受けながら用紙搬送方向に回転する。この状態では、用紙1はトラクタ10の送り力と搬送プラー2の抵抗力を受けているので用紙のたるみは発生せず又搬送プラー2の回転変動による用紙1の蛇行がないので転写されるトナー像は崩れることなく搬送され定着するので印刷品質を維持できる。
【0020】
以上の制御を図1の制御装置37にプログラムとして格納して搬送プラー2の切換えを行っている。制御装置37には制御方法プログラムを格納した記憶素子(HDD、ROM等)が設けられ、電子回路を用いてステッピングモータ16(図2では34)を制御している。
【0021】
本実施例では、用紙幅10インチ以上は、搬送プラーを停止し、10インチ未満では、搬送プラーを用紙搬送方向とは逆方向に回転を継続する。モールド製のローラ31,32のバラツキ等を本発明でカバーすることで、簡単な構成で高精度の搬送技術を得ることができる。
【0022】
【発明の効果】
本発明によれば、用紙に与える張力が不均一の場合でも用紙幅の広い連続用紙を搬送中、用紙が蛇行することなく安定した連続印刷が保証できる。
【図面の簡単な説明】
【図1】本発明の用紙送り制御方式のタイムチャートである。
【図2】従来の搬送プラー概略構成図である。
【図3】従来の用紙送り制御方式のタイムチャートである。
【図4】従来の電子写真印刷装置の概略構成図である。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a continuous paper printing apparatus that forms an image on continuous paper.
[0002]
[Prior art]
Here, an electrophotographic printing apparatus using continuous paper is taken as an example of the prior art.
[0003]
FIG. 2 shows an outline of a conveyance puller of a conventional apparatus.
[0004]
As shown in FIG. 2B, the conveyance puller has a roller 31 having a cylindrical shape and a roller 32 having a convex shape, and a plurality of rollers each having a pair formed on a shaft 33. The shaft 33 is rotated by the stepping motor 34. Since the roller 32 is attached to the shaft 33, it rotates at the same speed as the rotation of the shaft 33.
[0005]
As shown in FIG. 2A, since the roller 31 is inserted into the roller 32, the roller 31 rotates while receiving a rotating action from the surface in contact with the roller 32. Tension.
[0006]
FIG. 3 shows an operation sequence of the conveyance puller of the conventional apparatus.
[0007]
When a paper transport start instruction is transmitted from the host device, the transport puller 2 is rotated in the direction opposite to the paper transport direction to apply tension to the paper 1, and then the paper transport operation of the tractor 10 is started. When the instruction is transmitted, the paper is transported by a predetermined amount, and the tractor 10 is stopped after a predetermined amount of operation in the direction opposite to the paper transport direction during printing in order to match the writing position of the next print, and the transport puller 2 is stopped. It is a sequence.
[0008]
[Problems to be solved by the invention]
In the prior art, the plurality of rollers constituting the conveyance puller and applying tension to the paper are not exactly the same in shape, and the rotation speed is not the same speed, so each roller is applied to the paper while the conveyance puller is rotating. There was a variation in the applied tension. When the tension applied to almost both ends of the paper is not uniform left and right, the paper snakes while the paper is being transported, and the feed holes provided at both ends of the paper are disengaged from the pins provided at both ends of the tractor. There were issues such as stopping. In particular, during the conveyance of a wide sheet, the number of contacts with a plurality of rollers constituting the conveyance puller is higher because the wider sheet is larger than the narrower sheet. Further, even when the paper does not come off from the pin of the tractor due to the meandering of the paper, there is also a problem that affects the print quality that the toner image transferred to the paper is corrupted by the slight meandering of the paper.
[0009]
An object of the present invention is to solve the above-described problems with continuous paper having a wide paper width by simply devising a paper feed control method without changing and adding parts.
[0010]
[Means for Solving the Problems]
The above objects, an image forming unit for forming an image on continuous paper, a tractor for transporting the continuous paper, the continuous paper printing apparatus and a conveyance puller disposed in the sheet conveyance direction upstream side relative to the tractor, The paper width recognition means for recognizing the paper width of the continuous paper attached to the tractor, and the paper width recognition means recognized that the continuous paper attached to the tractor has a paper width wider than a predetermined paper width. When the paper pull by the tractor is started, the conveyance puller is rotated in a direction opposite to the paper conveyance direction, and the rotation of the conveyance puller is stopped when the paper conveyance by the tractor is started. When the recognition means recognizes that the continuous paper mounted on the tractor has a paper width equal to or smaller than a predetermined paper width, the conveyance puller is used before the paper conveyance by the tractor is started. It is rotated in a direction opposite to the conveying direction, even after the start of sheet feeding by the tractor is achieved by having a control means for performing control to continue the rotation of the conveying puller.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIG. In addition, the number of FIGS. 2-3 is used for the same thing as a prior art in a structure.
[0012]
A schematic configuration of the electrophotographic apparatus is shown in FIG. 4 to explain the principle of the printing operation.
[0013]
The sheet 1 is a continuous sheet that is continuous in a long shape, and feed holes (not shown) are formed at both edges at predetermined intervals along the sheet transport direction. The feed holes are mainly transported by the tractor 10. It is used for. Further, a plurality of pins 20 are provided at both ends of the tractor 10 to convey the paper, and the distance between the pins 20 is equal to a predetermined distance between the feed holes.
[0014]
The paper 1 is set in the hopper 17, and the leading edge of the paper is attached to the tractor 9 so that the pin 20 of the tractor 10 and the feed hole of the continuous paper 1 are aligned. By depressing a paper feed switch (not shown), the motor 16 rotates and the transport puller 2 rotates in the direction opposite to the paper transport direction. When the motor 15 rotates, the tractor 10 operates to transport the paper. The leading edge of the paper 1 passes through the tractor 10 and the buffer 11. The heating roll 12 and the pressure roll 13 are in an open state, and the leading edge of the paper 1 passes between the heating roll 12 and the pressure roll 13 and is conveyed to the fixing puller 14 and sequentially receives the swinging motion of the swing fin 15. 19 is discharged. The apparatus ends the conveyance control of the paper 1 so that the print start position becomes normal, and enters a standby state for the printing operation.
[0015]
The series of operations described above is a paper loading operation, and the outline of a process for recording and forming a toner image of this apparatus and a printing operation will be described below.
[0016]
When a print start signal is transmitted from a host device (not shown) (mainly a computer device) through a connection means (not shown) including a network or the like, the photosensitive drum 5 rotating in the paper transport direction is predetermined by the charger 8. The exposure apparatus 9 emits an irradiation beam that is uniformly charged to a potential and transmitted from the host apparatus, and an electrostatic latent image is formed on the photosensitive drum 5 that has received the irradiation beam. The negatively charged black toner is reversely developed. Toner is supplied to the electrostatic latent image that has reached the development area, and the electrostatic latent image is visualized as a toner image. The toner image formed on the surface of the photosensitive drum 5 is conveyed to a position facing the transfer device 4. The sheet 1 conveyed by the tractor 10 travels in front of the transfer device 4 at a constant speed and is pressed against the photosensitive drum 5 by the retractor 6. The toner image conveyed in front of the transfer device 4 is transferred to the paper 1 by the transfer device 4 in the transfer area. Further, in order to prevent the paper 1 from being wound around the photosensitive drum 5 and to transfer the toner image to the paper 1 without the paper 1 meandering, the transport puller 2 rotates in a direction opposite to the paper transport direction. Tension. The toner remaining on the surface of the photosensitive drum 5 without being transferred in the transfer region is removed from the surface of the photosensitive drum 5 by the cleaner 7.
[0017]
On the other hand, during the printing operation, the heating roll 12 and the pressure roll 13 are closed. The sheet 1 to which the toner image has been transferred passes through the tractor 10 and the buffer 11 and is nipped and conveyed while being subjected to a heating and pressing action from a pressing point where the heating roll 12 and the pressing roll 13 are in pressure contact. It is fixed on the paper 1. The fixed sheet 1 is conveyed to the fixing puller 14 and sequentially discharged to the stacker 19. When a print stop signal is transmitted from the host apparatus, the apparatus shifts to a print end operation and enters a print standby state.
[0018]
FIG. 1 is a time chart of a control method during sheet conveyance according to an embodiment of the present invention. 1 on the time chart is valid (signal present), and 0 is invalid. If the direction is the same as the paper conveyance direction, the polarity is positive, and the opposite direction is a negative polarity.
[0019]
A B (inch) paper (hereinafter referred to as a paper B) having a paper width wider than A (inch) is attached to the tractor 10. At this time, the apparatus recognizes that the paper width is larger than A (inch) by means for recognizing the paper width (for example, means for detecting the paper width or inputting paper width data from the operator). After completion of automatic loading, when a print start instruction is received from the host device and the paper is B, the transport puller 2 is rotated in the reverse direction to the paper transport direction before transporting the paper, and transported when the tractor 10 transports the paper B. Puller 2 is stopped. During paper conveyance, the conveyance puller rotates in the paper conveyance direction while receiving a rotating action from the paper 1. In this state, the sheet 1 is subjected to the feeding force of the tractor 10 and the resistance force of the conveying puller 2, so that the sheet does not sag and the transferred toner does not meander due to the rotation fluctuation of the conveying puller 2. Since the image is conveyed and fixed without breaking, the print quality can be maintained.
[0020]
The above control is stored as a program in the control device 37 of FIG. 1, and the conveyance puller 2 is switched. The control device 37 is provided with a storage element (HDD, ROM, etc.) storing a control method program, and controls the stepping motor 16 (34 in FIG. 2) using an electronic circuit.
[0021]
In this embodiment, when the paper width is 10 inches or more, the conveyance puller is stopped, and when the paper width is less than 10 inches, the conveyance puller is continuously rotated in the direction opposite to the paper conveyance direction. By covering the variations of the mold rollers 31 and 32 with the present invention, it is possible to obtain a highly accurate conveyance technique with a simple configuration.
[0022]
【The invention's effect】
According to the present invention, even when the tension applied to the paper is not uniform, stable continuous printing can be ensured without the paper meandering while the continuous paper having a wide paper width is being conveyed.
[Brief description of the drawings]
FIG. 1 is a time chart of a paper feed control system of the present invention.
FIG. 2 is a schematic configuration diagram of a conventional conveyance puller.
FIG. 3 is a time chart of a conventional paper feed control method.
FIG. 4 is a schematic configuration diagram of a conventional electrophotographic printing apparatus.

Claims (1)

連続紙に画像を形成する画像形成手段と、連続紙を搬送するトラクタと、トラクタに対し用紙搬送方向上流側に配置され搬送プラー備えた連続紙印刷装置において、
前記トラクタに装着された連続紙の用紙幅を認知する用紙幅認知手段と、
前記用紙幅認知手段が、前記トラクタに装着された連続紙が所定の用紙幅よりも広い用紙幅を有すると認識したときは、前記トラクタによる用紙搬送開始前に前記搬送プラーを用紙搬送方向とは逆方向に回転させ、前記トラクタによる用紙搬送開始に伴い前記搬送プラーの回転を停止させる制御を実行し、前記用紙幅認知手段が、前記トラクタに装着された連続紙が所定の用紙幅以下の用紙幅を有すると認識したときは、前記トラクタによる用紙搬送開始前に前記搬送プラーを用紙搬送方向とは逆方向に回転させるとともに、前記トラクタによる用紙搬送開始後も前記搬送プラーの回転を継続させる制御を実行する制御手段と
を備えたことを特徴とする連続紙印刷装置
Image forming means for forming an image on continuous paper, a tractor for transporting the continuous paper, the continuous paper printing apparatus and a conveyance puller disposed in the sheet conveyance direction upstream side relative to the tractor,
Paper width recognition means for recognizing the paper width of the continuous paper mounted on the tractor;
When the paper width recognizing means recognizes that the continuous paper mounted on the tractor has a paper width wider than a predetermined paper width, the paper pulling direction is defined as the paper conveyance direction before the paper conveyance by the tractor is started. Rotating in the reverse direction and executing control to stop the rotation of the transport puller as the tractor starts transporting the paper, and the paper width recognition means is a paper whose continuous paper loaded on the tractor is equal to or smaller than a predetermined paper width. When it is recognized that the sheet has a width, the conveyance puller is rotated in the direction opposite to the sheet conveyance direction before starting the sheet conveyance by the tractor, and the rotation of the conveyance puller is continued even after the sheet conveyance by the tractor is started. Control means to execute
Continuous sheet printing apparatus characterized by comprising a.
JP2000320385A 2000-10-20 2000-10-20 Continuous paper printer Expired - Fee Related JP3832715B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000320385A JP3832715B2 (en) 2000-10-20 2000-10-20 Continuous paper printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000320385A JP3832715B2 (en) 2000-10-20 2000-10-20 Continuous paper printer

Publications (2)

Publication Number Publication Date
JP2002128343A JP2002128343A (en) 2002-05-09
JP3832715B2 true JP3832715B2 (en) 2006-10-11

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000320385A Expired - Fee Related JP3832715B2 (en) 2000-10-20 2000-10-20 Continuous paper printer

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JP (1) JP3832715B2 (en)

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JP2002128343A (en) 2002-05-09

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