JP4875456B2

JP4875456B2 - Printing device

Info

Publication number: JP4875456B2
Application number: JP2006292367A
Authority: JP
Inventors: 竜一助川; 剛史長洲; 定典小橋
Original assignee: Ricoh Co Ltd
Current assignee: Ricoh Co Ltd
Priority date: 2006-10-27
Filing date: 2006-10-27
Publication date: 2012-02-15
Anticipated expiration: 2026-10-27
Also published as: JP2008105837A

Description

本発明は、用紙を搬送する用紙搬送装置と、用紙の蛇行量を補正する蛇行矯正装置を有する印刷装置に関するものである。 The present invention relates to a printing apparatus having a sheet conveying apparatus that conveys a sheet and a meandering correction apparatus that corrects a meandering amount of the sheet.

用紙を搬送する用紙搬送装置と、用紙の蛇行量を補正する蛇行矯正装置を有する印刷装置として複写機やレーザビームプリンタ等の電子写真装置を例として用紙搬送について説明する。 The paper conveyance will be described by taking an electrophotographic apparatus such as a copying machine or a laser beam printer as an example of a printing apparatus having a paper conveyance device for conveying the paper and a meandering correction device for correcting the meandering amount of the paper.

従来の印刷装置では、印刷速度、印刷品質の向上に加え紙質、紙厚、寸法など多岐にわたる印刷用紙に対応するため用紙の蛇行矯正装置とその制御装置が設けられている。 A conventional printing apparatus is provided with a paper meandering correction device and its control device in order to cope with various printing papers such as paper quality, paper thickness, and dimensions in addition to improvement in printing speed and printing quality.

用紙搬送装置でも、加圧ロール方式を採用している定着装置は、用紙走行性能に与える影響が大きく、特に連続用紙用レーザビームプリンタなどでは、定着装置に用紙の蛇行矯正装置をもたせた例が多く知られている。 Even in the paper transport device, the fixing device adopting the pressure roll method has a great influence on the paper running performance. Especially in the laser beam printer for continuous paper, there is an example in which the fixing device has a paper meandering correction device. Many are known.

連続紙用レーザビームプリンタ等の電子写真装置は、図４に示すように印刷用紙２０１をトラクタ２０３により感光ドラム２０２の周期と同速度で移動させ、転写器２０８により印刷用紙２０１にトナー像を転写させた後、印刷用紙２０１に一定の張力を与える為のバッファ２０４を通り、用紙搬送ガイド２０５を通過後、熱ロール２０６及び加圧ロール２０７によりトナー像を加圧・加熱し、印刷用紙２０１に溶融定着させ、プラー２１１とプラーロール２１０で印刷用紙２０１を一定張力で引張り、印刷用紙２０１を折り畳むためのスゥィングフィン２１２で印刷用紙を折り畳んだ後、印刷用紙２０１を積載するスタッカ２１３へ印刷用紙２０１を搬送する。 An electrophotographic apparatus such as a continuous paper laser beam printer moves a printing paper 201 at the same speed as the cycle of the photosensitive drum 202 by a tractor 203 and transfers a toner image onto the printing paper 201 by a transfer device 208 as shown in FIG. Then, after passing through the buffer 204 for applying a constant tension to the printing paper 201 and passing through the paper conveyance guide 205, the toner image is pressed and heated by the heat roll 206 and the pressure roll 207 to form the printing paper 201. After fusing and fixing, pulling the printing paper 201 with a constant tension with the puller 211 and the puller roll 210, folding the printing paper with the swing fin 212 for folding the printing paper 201, and then printing the printing paper 201 to the stacker 213 on which the printing paper 201 is stacked. Transport.

前記の構成の電子写真装置では、印刷用紙２０１の駆動はトラクタ２０３によるピン駆動と、熱ロール２０６−印刷用紙２０１−加圧ロール２０７の摩擦駆動との２つの駆動によりなされるが、熱ロール２０６−加圧ロール２０７間の摩擦力で印刷用紙２０１を搬送する部分においては、印刷用紙２０１が左右に蛇行することにより印刷用紙２０１にストレスがかかり、送り穴にシワなどが発生する。その為、センサ２０９で印刷用紙２０１の蛇行を検出し、熱ロール２０６と加圧ロール２０７の接触圧力を熱ロール２０６の支持軸に対し左右に変化させることにより、印刷用紙２０１の蛇行を矯正する蛇行矯正装置が付加されている。 In the electrophotographic apparatus having the above-described configuration, the driving of the printing paper 201 is performed by two driving operations of the pin driving by the tractor 203 and the friction driving of the heating roll 206 -the printing paper 201 -the pressure roll 207. -In the portion where the printing paper 201 is conveyed by the frictional force between the pressure rolls 207, the printing paper 201 meanders to the left and right, stress is applied to the printing paper 201, and wrinkles are generated in the feed holes. Therefore, the meandering of the printing paper 201 is corrected by detecting the meandering of the printing paper 201 by the sensor 209 and changing the contact pressure between the heat roll 206 and the pressure roll 207 left and right with respect to the support shaft of the heat roll 206. A meandering correction device is added.

図５に、従来の蛇行矯正装置の一例を示す。熱ロール２０６は、図示しない支持部と駆動部とで一定位置で回転可能に構成される。加圧ロール２０７は、印刷用紙２０１を挟んで熱ロール２０６に対向して位置する。 FIG. 5 shows an example of a conventional meandering correction device. The heat roll 206 is configured to be rotatable at a fixed position by a support unit and a drive unit (not shown). The pressure roll 207 is positioned to face the heat roll 206 with the printing paper 201 interposed therebetween.

加圧ロール２０７は図示しない案内溝にそって半径方向に可動な構造となっている。加圧ロール２０７を熱ロール２０６に押しつける押し付け手段はアーム３０４とカム３０２とスプリング３０７とから構成され、加圧ロール２０７両端に各々１組ずつ設けられている。アーム３０４は、一端に軸受け３０５を有し、図示しないフレームに回転可能に支持される。アーム３０４の他端は、スプリング３０７の一端が連結され、熱ロール２０６の方向へ引っ張られている。カム３０２は、アーム３０４に設けられたカムフォロア３０３に当接する位置に設置される。１対のカム３０２はカムシャフト３０６で連結され、カムシャフト３０６は図示しないフレームに回転可能に支持され、モータ３０１により回転させることができる。加圧ロール２０７の両端からは、回転可能なシャフトが突き出しており、シャフトは常にアームの一部に当接している。 The pressure roll 207 has a structure movable in the radial direction along a guide groove (not shown). The pressing means for pressing the pressure roll 207 against the heat roll 206 includes an arm 304, a cam 302, and a spring 307, and one set is provided at each end of the pressure roll 207. The arm 304 has a bearing 305 at one end and is rotatably supported by a frame (not shown). The other end of the arm 304 is connected to one end of a spring 307 and pulled toward the heat roll 206. The cam 302 is installed at a position in contact with a cam follower 303 provided on the arm 304. The pair of cams 302 are connected by a camshaft 306. The camshaft 306 is rotatably supported by a frame (not shown) and can be rotated by a motor 301. A rotatable shaft protrudes from both ends of the pressure roll 207, and the shaft is always in contact with a part of the arm.

非印刷時において、カムシャフト３０６は加圧ロール２０７が熱ロール２０６から離れた位置にくるように回転し、停止する。印刷時は、カムシャフト３０６が回転し、カム３０２がカムフォロア３０３から離れ、加圧ロール２０７が熱ロール２０６に完全に接する位置で停止する。この時、スプリング３０７が加圧ロール２０７を押しつけ印刷用紙２０１は加圧ロール２０７と熱ロール２０６とに挟まれ、熱ロール２０６の回転により、加圧ロール２０７は従動し印刷用紙２０１は定着されながら搬送される。 During non-printing, the camshaft 306 rotates and stops so that the pressure roll 207 comes to a position away from the heat roll 206. During printing, the camshaft 306 rotates, the cam 302 moves away from the cam follower 303, and stops at a position where the pressure roll 207 completely contacts the heat roll 206. At this time, the spring 307 presses the pressure roll 207 so that the printing paper 201 is sandwiched between the pressure roll 207 and the heat roll 206, and the pressure roll 207 is driven by the rotation of the heat roll 206 and the printing paper 201 is fixed. Be transported.

印刷用紙送行位置は、センサ２０９により検出される。印刷用紙が、用紙送行位置の送行方向に向かって左にずれていることを検出した場合、モータ３０１はカムシャフト３０６を左側からみて反時計方向に回転させる。 The print paper feed position is detected by the sensor 209. When it is detected that the printing paper is shifted to the left in the paper feeding position in the paper feeding position, the motor 301 rotates the cam shaft 306 counterclockwise as viewed from the left side.

この動きによって左側のカム３０２ａがカムフォロア３０３に当接し、左側のスプリング力に対して、アーム３０４ａをわずかに押し戻す。この結果、加圧ロール２０７左側の押しつけ力が右側と比べて小さくなり、用紙左側の搬送力が右側より小さくなるため、用紙送行位置は右側にずれることになる。このようにして、用紙送行位置ずれ（蛇行）を矯正することができる。右側に蛇行した場合、前記の反対の動作をおこなう。 This movement causes the left cam 302a to come into contact with the cam follower 303, and slightly pushes back the arm 304a against the left spring force. As a result, the pressing force on the left side of the pressure roll 207 is smaller than that on the right side, and the conveying force on the left side of the sheet is smaller than that on the right side, so that the sheet feeding position is shifted to the right side. In this way, the paper feeding position shift (meandering) can be corrected. When meandering to the right, the opposite operation is performed.

すなわち、図６に示すように、印刷用紙２０１をＡ側に曲げたい時は、熱ロール２０６と加圧ロール２０７の接触圧をＡ側を高く、Ｂ側を低くすることにより、熱ロール２０６及び加圧ロール２０７はＡ側の径ｒ_ａが圧縮されてＢ側の径ｒ_ｂよりも小さくなり、熱ロール２０６及び加圧ロール２０７の周速はＢ側の方が速くなる（Ｖ_ｒａ＜Ｖ_ｒｂ）。従って、搬送される印刷用紙２０１の移動量はＡ側よりもＢ側の方が多くなり、印刷用紙２０１はＡ側に寄っていくことになる。逆に、印刷用紙２０１をＢ側に曲げたい時は、同様に熱ロール２０６と加圧ロール２０７の接触圧をＢ側を高く、Ａ側を低くすることにより印刷用紙２０１はＢ側に寄ってくる。 That is, as shown in FIG. 6, when the printing paper 201 is to be bent to the A side, the contact pressure between the heat roll 206 and the pressure roll 207 is set higher on the A side and lower on the B side. pressure roll 207 is smaller than the diameter _{r b} of the compressed diameter _{r a} of the a-side B-side, the peripheral speed of the heat roll 206 and pressure roll 207 toward the B side is increased _(V ra <V _rb ). Therefore, the amount of movement of the conveyed printing paper 201 is greater on the B side than on the A side, and the printing paper 201 approaches the A side. Conversely, when it is desired to bend the printing paper 201 to the B side, similarly, the printing paper 201 moves closer to the B side by increasing the contact pressure between the heat roll 206 and the pressure roll 207 on the B side and lowering the A side. come.

次に、用紙蛇行矯正制御について図２、図７を用いて説明する。印刷用紙２０１が送行を開始すると用紙送行位置を検出するセンサ２０９からの信号を一定周期でマイクロプロセッサ１０１に入力しマイクロプロセッサ１０１のプログラム処理である蛇行量記憶処理１０２にて理想送行位置からの離れている蛇行量を記憶する。蛇行量算出処理１０３では、蛇行量記憶処理１０２で記憶している蛇行量平均値を算出して記憶する。蛇行量変化率算出処理１０４では、蛇行量記憶処理１０２で記憶した蛇行量平均値を使用して、前回蛇行量と今回蛇行量から蛇行量変化率を算出する。オフセット量算出処理１０５では、蛇行量記憶処理１０２で記憶した蛇行量平均値を使用して理想送行位置から離れているか否かを判別して一定の値を駆動量に加算するように処理する。 Next, the paper meandering correction control will be described with reference to FIGS. When the printing paper 201 starts feeding, a signal from the sensor 209 for detecting the paper feeding position is input to the microprocessor 101 at a fixed period, and the signal is moved away from the ideal feeding position in the meandering amount storage process 102 which is a program process of the microprocessor 101. Memorize the amount of meandering. In the meandering amount calculation processing 103, the meandering amount average value stored in the meandering amount storage processing 102 is calculated and stored. In the meandering amount change rate calculation process 104, the meandering amount change rate is calculated from the previous meandering amount and the current meandering amount using the meandering amount average value stored in the meandering amount storage process 102. In the offset amount calculation processing 105, the meandering amount average value stored in the meandering amount storage processing 102 is used to determine whether or not it is away from the ideal feeding position, and processing is performed to add a certain value to the driving amount.

モータ駆動量算出処理１０６では、一定時間毎に蛇行量算出処理１０３で求めた蛇行量平均値から図２に示す蛇行量とモータ３０１の駆動量データテーブルからの駆動量と蛇行量変化率算出処理１０４で求めた蛇行量変化率からのドライブ量、及びオフセット量算出処理１０５からの駆動量を加算したモータの駆動量をモータ駆動回路１０７へ出力する。モータ駆動回路１０７からの駆動電流によりモータ３０１を駆動し前述したカムシャフト３０６を回転し印刷用紙２０１を送行すべき理想送行位置に蛇行補正する。 In the motor driving amount calculation processing 106, the meandering amount average value obtained in the meandering amount calculation processing 103 at regular intervals is used to calculate the meandering amount shown in FIG. 2 and the driving amount from the driving amount data table of the motor 301 and the meandering amount change rate calculation processing. The motor drive amount obtained by adding the drive amount from the meandering amount change rate obtained in 104 and the drive amount from the offset amount calculation processing 105 is output to the motor drive circuit 107. The motor 301 is driven by the drive current from the motor drive circuit 107, the cam shaft 306 is rotated, and the meandering correction is performed to the ideal feeding position where the printing paper 201 should be fed.

しかしながら、加圧ロール２０７の押し付け力と実際の用紙への蛇行矯正に働く力との関係は、必ずしもリニアな関係にあるとは限らず、またカム３０２の形状もモータのトルク特性など考慮して設定されるため、単位角度当たりの変位量はリニアに変化するものではない。このため、用紙蛇行矯正制御装置で算出した蛇行矯正用モータ３０１の駆動量と蛇行矯正装置との整合が上手く取れなかった場合、蛇行矯正力不足や蛇行矯正力過大によるハンチング現象を起こすことがあった。 However, the relationship between the pressing force of the pressure roll 207 and the force acting to correct the meandering to the actual paper is not necessarily a linear relationship, and the shape of the cam 302 also takes into account the torque characteristics of the motor. Since it is set, the amount of displacement per unit angle does not change linearly. Therefore, if the drive amount of the meandering correction motor 301 calculated by the paper meandering correction control device and the meandering correction device are not well matched, a hunting phenomenon may occur due to insufficient meandering correction force or excessive meandering correction force. It was.

特開２００３−１６０２６２号公報JP 2003-160262 A

従来の印刷装置では、カム３０２の用紙蛇行矯正の際に使用するカム形状が、加圧ロール２０７の押し付け力と蛇行矯正力の関係やモータ３０１のトルク特性によって設定されていたため、必ずしも単位角度当たりの変位量が一定ではなかった。このため、モータ３０１の駆動量に対し、蛇行矯正量が比例せず、カム３０２の単位角度当たりの変位量が大きい部分においては、蛇行矯正量が過大となり、単位角度当たりの変位量が小さい部分においては、蛇行矯正量が不足するという課題があった。 In the conventional printing apparatus, the cam shape used when correcting the paper meandering of the cam 302 is set according to the relationship between the pressing force of the pressure roll 207 and the meandering correcting force and the torque characteristics of the motor 301. The amount of displacement was not constant. For this reason, the meandering correction amount is not proportional to the drive amount of the motor 301, and the portion where the displacement amount per unit angle of the cam 302 is large is excessive, and the amount of displacement per unit angle is small. Has a problem that the amount of correction of meandering is insufficient.

本発明の目的は、前記従来技術の課題を解決して、用紙幅や厚さ、蛇行しやすい等の雑多な印刷用紙に対して適切な用紙蛇行矯正制御を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and provide paper meandering correction control suitable for various printing papers such as paper width and thickness, and easy to meander.

前記目的を達成するため本発明は、２本のロールを有し、該２本のロールで用紙を狭持搬送する用紙搬送装置と、用紙位置を検出する用紙位置検出手段と、該用紙位置検出手段によって検出されたデータより用紙の蛇行量を記憶する記憶手段と、該記憶手段に記憶された用紙の蛇行量の蛇行量平均値を算出する蛇行量平均値算出手段と、前記蛇行量平均値から蛇行矯正駆動量を算出する蛇行矯正駆動量算出手段と、前記蛇行矯正駆動量に基いて駆動される蛇行矯正駆動手段を設けた蛇行矯正装置を備えた印刷装置において、前記蛇行矯正装置は、前記蛇行矯正駆動手段からの駆動力により、前記２本のロールのうち一方の支持軸に対するもう片方のロールの軸方向の傾きを変えて、２本のロール間の軸方向の接触圧力を可変させる１対のカムを有し、該１対のカムは、前記蛇行矯正時に使用する回転角度範囲について、０°を基準として、一方のカムが０°〜ａ°までの範囲であり、他方のカムが０°〜−ａ°の範囲であり、それぞれ０°付近の単位角度当たりの変位量が小さく、回転角度の絶対値｜ａ｜°に近づくにつれて単位角度当たりの変位量が大きくなる形状であり、前記蛇行矯正駆動量算出手段は、蛇行矯正駆動量の算出時に、前記カムの単位角度当たりの変位量に対し、前記カムの前記単位角度当たりの変位量が小さいときには、前記蛇行矯正駆動手段の駆動量の変化量を徐々に大きくし、前記カムの前記単位角度当たりの変位量が大きくなるにつれて前記蛇行矯正駆動手段の駆動量の変化量を徐々に小さくして、前記ロールの接触圧力による用紙の蛇行矯正量を用紙蛇行量と比例させて制御する構成であることを特徴とする。
また、前記蛇行矯正装置は、前記蛇行量平均値算出手段、前記蛇行矯正量算出手段、前記蛇行矯正駆動量算出手段に代えて、前記蛇行量平均値算出手段、前記蛇行矯正量算出手段、前記蛇行矯正駆動量算出手段で行われる処理を行うマイクロプロセッサを有することを特徴とする。
また、前記蛇行矯正時に使用する回転角度範囲の上限の絶対値ａ°は、３０°であることを特徴とする。
また、前記２本のロールは、定着装置の熱ロールおよび加圧ロールであることを特徴とする。
In order to achieve the above object, the present invention has two rolls, a paper transport device for nipping and transporting paper with the two rolls, a paper position detecting means for detecting the paper position, and the paper position detection. Storage means for storing the meandering amount of the paper from the data detected by the means, meandering amount average value calculating means for calculating the meandering amount average value of the meandering amount of the paper stored in the storage means, and the meandering amount average value A meandering correction drive amount calculating means for calculating the meandering correction drive amount from the meandering correction device, and a meandering correction device provided with a meandering correction driving means driven based on the meandering correction drive amount, the meandering correction device is The axial contact pressure between the two rolls is varied by changing the axial inclination of the other roll with respect to one support shaft of the two rolls by the driving force from the meandering correction driving means. A pair of cams A, the pair of cam, the rotation angle range to be used when the meandering correction, 0 ° as a reference, in the range of up to one cam 0 ° ~a °, the other cam is 0 ° ~ - the range of a °, the displacement amount per unit angle near 0 ° is small, and the displacement amount per unit angle increases as it approaches the absolute value | a | ° of the rotation angle. When calculating the meandering correction driving amount, the amount calculating means is a change amount of the driving amount of the meandering correction driving means when the displacement amount of the cam per unit angle is smaller than the displacement amount per unit angle of the cam. was gradually increased, the unit displacement per angle gradually reduce the driving amount of the change amount of the meandering correcting drive means as the size Kunar, meander correction amount of the sheet by the contact pressure of the rolls of the cam The amount of paper meander It is the structure which controls in proportion to .
In addition, the meandering correction device, instead of the meandering amount average value calculating means, the meandering correction amount calculating means, and the meandering correction driving amount calculating means, the meandering amount average value calculating means, the meandering correction amount calculating means, It has a microprocessor which performs the process performed by the meandering correction drive amount calculation means.
The upper limit absolute value a ° of the rotation angle range used during the meandering correction is 30 °.
Further, the two rolls are a heat roll and a pressure roll of a fixing device.

また、前記目的を達成するため本発明は、２本のロールを有し、該２本のロールで用紙を狭持搬送する用紙搬送手段と、用紙位置を検出する用紙位置検出手段と、該用紙位置検出手段によって検出されたデータより用紙の蛇行量を記憶する記憶手段と、該記憶手段に記憶された用紙の蛇行量の蛇行量平均値を算出する蛇行量平均値算出手段と、前記蛇行量平均値から蛇行矯正駆動量を算出する蛇行矯正駆動量算出手段と、前記蛇行矯正駆動量に基づいて駆動される蛇行矯正駆動手段を設けた蛇行矯正装置において、前記蛇行矯正装置は、前記蛇行矯正駆動手段からの駆動力により、前記２本のロールのうち一方の支持軸に対するもう片方のロールの軸方向の傾きを変えて、２本のロール間の軸方向の接触圧力を可変させる１対のカムを有し、該１対のカムは、前記蛇行矯正時に使用する回転角度範囲について、０°を基準として、一方のカムが０°〜ａ°までの範囲であり、他方のカムが０°〜−ａ°の範囲であり、それぞれ０°付近の単位角度当たりの変位量が小さく、回転角度の絶対値｜ａ｜°に近づくにつれて単位角度当たりの変位量が大きくなる形状であり、前記蛇行矯正駆動量算出手段は、蛇行矯正駆動量の算出時に、前記カムの単位角度当たりの変位量に対し、前記カムの前記単位角度当たりの変位量が小さいときには、前記蛇行矯正駆動手段の駆動量の変化量を徐々に大きくし、前記カムの前記単位角度当たりの変位量が大きくなるにつれて前記蛇行矯正駆動手段の駆動量の変化量を徐々に小さくして、前記ロールの接触圧力による用紙の蛇行矯正量を用紙蛇行量と比例させて制御する構成であることを特徴とする。 In order to achieve the above object, the present invention has two rolls, a sheet conveying means for nipping and conveying a sheet by the two rolls, a sheet position detecting means for detecting a sheet position, and the sheet Storage means for storing the meandering amount of the paper from the data detected by the position detection means, meandering amount average value calculating means for calculating the meandering amount average value of the meandering amount of the paper stored in the storage means, and the meandering amount In the meandering correction device provided with meandering correction driving amount calculating means for calculating the meandering correction driving amount from an average value, and meandering correction driving means driven based on the meandering correction driving amount, the meandering correction device includes the meandering correction device. By a driving force from the driving means, a pair of the two rolls that change the axial inclination of the other roll with respect to one of the support shafts and vary the axial contact pressure between the two rolls. It has a cam, The pair of cams has a rotation angle range used during the meandering correction, with one cam being in the range from 0 ° to a ° on the basis of 0 °, and the other cam being in the range from 0 ° to -a °. The displacement amount per unit angle near 0 ° is small, and the displacement amount per unit angle increases as it approaches the absolute value | a | ° of the rotation angle. When the meandering correction drive amount is calculated, if the displacement amount per unit angle of the cam is small relative to the displacement amount per unit angle of the cam, the change amount of the drive amount of the meandering correction driving means is gradually increased. and, the displacement amount per unit angle is gradually reduced driving amount of variation of the meander correcting drive means as the magnitude Kunar of the cam, the paper meandering amount meandering correction amount of the sheet by the contact pressure of the roll And proportional It is the structure which controls it.

本発明においては、用紙幅や厚さ、蛇行しやすい等の雑多な印刷用紙に対して、用紙蛇行矯正用モータの駆動量が不足や過大を防ぐように制御することにより、印刷用紙を蛇行することなく用紙搬送できる印刷装置を提供することができる。 In the present invention, the printing paper is meandered by controlling the miscellaneous printing paper, such as the paper width and thickness, and being easy to meander, to prevent the drive amount of the paper meander correction motor from being insufficient or excessive. It is possible to provide a printing apparatus that can convey a sheet without any problem.

本発明では前述のように印刷用紙の蛇行矯正制御を従来より使用している用紙位置検出センサ２０９、蛇行矯正量を算出するマイクロプロセッサ１０１と蛇行矯正用のモータ３０１で構成し、カム３０２の形状に合わせてモータ３０１の駆動量を工夫することで実現した。 In the present invention, as described above, the paper position detection sensor 209 that has conventionally used the meandering correction control of the printing paper, the microprocessor 101 that calculates the meandering correction amount, and the motor 301 for correcting the meandering, and the shape of the cam 302 This is realized by devising the driving amount of the motor 301 in accordance with the above.

具体的にはカム３０２の形状に合わせて、モータ３０１の駆動量の見直しを行い、カム３０２の単位角度当たりの変位量が大きい部分においては、モータ３０１の駆動量を少なく、カム３０２の単位角度当たりの変位量が小さい部分においては、モータ３０１の駆動量を大きく設定するように構成した。 Specifically, the driving amount of the motor 301 is reviewed in accordance with the shape of the cam 302, and in the portion where the displacement amount per unit angle of the cam 302 is large, the driving amount of the motor 301 is reduced and the unit angle of the cam 302 is reduced. In a portion where the hit displacement amount is small, the drive amount of the motor 301 is set to be large.

次に本発明の実施形態を図１及び図３を用いて説明する。図１は本発明の実施形態に係る用紙蛇行量とモータ駆動量の関係を示すグラフ、図３は用紙蛇行矯正装置で用いられる左右カムのプロフィール図である。 Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a graph showing the relationship between a sheet meandering amount and a motor drive amount according to an embodiment of the present invention, and FIG. 3 is a profile diagram of left and right cams used in a sheet meandering correction device.

図３に示すように、左側のカム３０２ａの蛇行矯正時に使用する部分は、回転角度１５０度〜１８０度の範囲であり、右側のカム３０２ｂの蛇行矯正時に使用する部分は、回転角度１８０度〜２１０度の範囲である。左側のカム３０２ａは、１８０度付近の単位角度当たりの変位量が小さく、回転角度１５０度に近づくに従い、単位角度当たりの変位量が大きくなっている。右側のカム３０２ｂは、１８０度付近の単位角度当たりの変位量が小さく、回転角度２１０度に近づくに従い、単位角度当たりの変位量が大きくなっている。 As shown in FIG. 3, the portion used when correcting the meandering of the left cam 302a is in the range of a rotation angle of 150 to 180 degrees, and the portion used when correcting the meandering of the right cam 302b is a rotation angle of 180 degrees or more. The range is 210 degrees. The left cam 302a has a small displacement amount per unit angle near 180 degrees, and the displacement amount per unit angle increases as the rotation angle approaches 150 degrees. The cam 302b on the right side has a small displacement amount per unit angle near 180 degrees, and the displacement amount per unit angle increases as the rotation angle approaches 210 degrees.

図１に前記カム３０２の形状に合わせた用紙蛇行量とモータ３０１の駆動量の関係を示す。用紙蛇行量が小さい範囲にある時のカム３０２の形状は、単位角度当たりの変位量が小さいため、モータ３０１の駆動量を大きくし、反対に用紙蛇行量の大きい範囲のある時のカム３０２の形状は、単位角度当たりの変位量が大きいため、モータ３０１駆動量は小さくしている。これにより、加圧ロール２０７の押し付けによる用紙蛇行矯正量は、常に過不足のないリニアな動きになり、安定した用紙蛇行矯正制御を実現することが出来る。 FIG. 1 shows the relationship between the sheet meandering amount and the driving amount of the motor 301 in accordance with the shape of the cam 302. The shape of the cam 302 when the paper meandering amount is in a small range is such that the displacement per unit angle is small. Therefore, the drive amount of the motor 301 is increased, and conversely, the cam 302 has a large range of paper meandering amount. Since the displacement amount per unit angle is large, the driving amount of the motor 301 is small. As a result, the amount of correction of the meandering paper due to the pressing of the pressure roll 207 always becomes a linear motion without excess or deficiency, and stable paper meandering correction control can be realized.

本発明は、用紙を搬送する用紙搬送装置と、用紙の蛇行量を矯正する蛇行矯正装置を有する印刷装置に利用することが可能である。 The present invention can be used in a printing apparatus having a sheet conveying apparatus that conveys a sheet and a meandering correction apparatus that corrects the meandering amount of the sheet.

本発明の一実施例である用紙蛇行量とモータ駆動量の関係を示すグラフである。It is a graph which shows the relationship between the amount of paper meandering which is one Example of this invention, and a motor drive amount. 従来の用紙蛇行矯正装置における用紙蛇行量とモータ駆動量の関係を示すグラフである。It is a graph which shows the relationship between the amount of paper meandering, and the amount of motor drives in the conventional paper meandering correction apparatus. 用紙蛇行矯正装置で用いられる左右カムのプロフィール図である。It is a profile figure of the right-and-left cam used with a paper meandering correction apparatus. 印刷装置の例として連続紙用レーザビームプリンタを示した模式図である。It is the schematic diagram which showed the laser beam printer for continuous paper as an example of a printing apparatus. 用紙蛇行矯正装置の模式図である。It is a schematic diagram of a paper meandering correction device. 用紙蛇行矯正装置における蛇行補正時の熱ロールと圧力ロールの状態を示す模式図である。It is a schematic diagram which shows the state of the heat roll and pressure roll at the time of meandering correction | amendment in a paper meandering correction apparatus. 用紙蛇行矯正装置全体の制御系を示す模式図である。It is a schematic diagram which shows the control system of the whole paper meandering correction apparatus.

Explanation of symbols

１０１…マイクロプロセッサ、１０２…蛇行量記憶処理、１０３…蛇行量算出処理、１０４…蛇行量変化率算出処理、１０５…、オフセット量算出処理、１０６…モータ駆動量算出処理、１０７…モータ駆動回路、２０１…印刷用紙、２０２…感光ドラム、２０３…トラクタ、２０４…バッファ、２０５…用紙搬送ガイド、２０６…熱ロール、２０７…加圧ロール、２０８…転写器、２０９…センサ、２１０…プラーロール、２１１…プラー、２１２…スウィングフィン、２１３…スタッカ、３０１…モータ、３０２…カム、３０３…カムフォロア、３０４…アーム、３０５…軸受け、３０６…カムシャフト、３０７…スプリング。 DESCRIPTION OF SYMBOLS 101 ... Microprocessor, 102 ... Meander amount storage process, 103 ... Meander amount calculation process, 104 ... Meander amount change rate calculation process, 105 ..., Offset amount calculation process, 106 ... Motor drive amount calculation process, 107 ... Motor drive circuit, DESCRIPTION OF SYMBOLS 201 ... Printing paper, 202 ... Photosensitive drum, 203 ... Tractor, 204 ... Buffer, 205 ... Paper conveyance guide, 206 ... Heat roll, 207 ... Pressure roll, 208 ... Transfer device, 209 ... Sensor, 210 ... Puller roll, 211 ... Puller, 212 ... Swing fin, 213 ... Stacker, 301 ... Motor, 302 ... Cam, 303 ... Cam follower, 304 ... Arm, 305 ... Bearing, 306 ... Cam shaft, 307 ... Spring.

Claims

A paper transport device having two rolls for nipping and transporting paper with the two rolls, paper position detecting means for detecting the paper position, and meandering of the paper from the data detected by the paper position detecting means Storage means for storing the amount, meandering amount average value calculating means for calculating the meandering amount average value of the meandering amount of the paper stored in the storage means, and meandering correction for calculating the meandering correction driving amount from the meandering amount average value In a printing apparatus comprising a meandering correction device provided with a driving amount calculation means and a meandering correction driving means driven based on the meandering correction driving amount,
The meandering correction device is:
The axial contact pressure between the two rolls is varied by changing the axial inclination of the other roll with respect to one support shaft of the two rolls by the driving force from the meandering correction driving means. Have a pair of cams,
The pair of cams has a rotation angle range used during the meandering correction in which one cam is in a range from 0 ° to a ° with respect to 0 °, and the other cam is in a range from 0 ° to −a °. Range,
The displacement amount per unit angle near 0 ° is small, and the displacement amount per unit angle increases as it approaches the absolute value | a | ° of the rotation angle.
The meandering correction drive amount calculating means, when the calculated meandering correction drive amount, relative to the amount of displacement of the unit angle per of the cam, when the displacement amount of the unit angle per of the cam is small, the driving of the meandering correcting drive means gradually increasing the amount of change in the amount, the displacement amount per unit angle is gradually reduced driving amount of variation of the meander correcting drive means as the magnitude Kunar of the cam, the sheet due to contact pressure of the roll A printing apparatus characterized in that the amount of correction of meandering is controlled in proportion to the amount of paper meandering .

The meandering correction device replaces the meandering amount average value calculating means, the meandering correction amount calculating means, and the meandering correction driving amount calculating means, instead of the meandering amount average value calculating means, the meandering correction amount calculating means, the meandering correction The printing apparatus according to claim 1, further comprising a microprocessor that performs processing performed by the driving amount calculation unit.

2. The printing apparatus according to claim 1, wherein the upper limit absolute value a [deg.] Of the rotation angle range used during the meandering correction is 30 [deg .].

The printing apparatus according to claim 1, wherein the two rolls are a heat roll and a pressure roll of a fixing device.

A sheet conveying unit having two rolls for nipping and conveying a sheet with the two rolls, a sheet position detecting unit for detecting a sheet position, and a meandering sheet based on data detected by the sheet position detecting unit Storage means for storing the amount, meandering amount average value calculating means for calculating the meandering amount average value of the meandering amount of the paper stored in the storage means, and meandering correction for calculating the meandering correction driving amount from the meandering amount average value In the meandering correction device provided with the driving amount calculation means and the meandering correction driving means driven based on the meandering correction driving amount,
The meandering correction device is:
The axial contact pressure between the two rolls is varied by changing the axial inclination of the other roll with respect to one support shaft of the two rolls by the driving force from the meandering correction driving means. Have a pair of cams,
The pair of cams has a rotation angle range used during the meandering correction in which one cam is in a range from 0 ° to a ° with respect to 0 °, and the other cam is in a range from 0 ° to −a °. Range,
The displacement amount per unit angle near 0 ° is small, and the displacement amount per unit angle increases as it approaches the absolute value | a | ° of the rotation angle.
The meandering correction drive amount calculating means, when the calculated meandering correction drive amount, relative to the amount of displacement of the unit angle per of the cam, when the displacement amount of the unit angle per of the cam is small, the driving of the meandering correcting drive means gradually increasing the amount of change in the amount, the displacement amount per unit angle is gradually reduced driving amount of variation of the meander correcting drive means as the magnitude Kunar of the cam, the sheet due to contact pressure of the roll The meandering correction device is characterized in that the meandering correction amount is controlled in proportion to the paper meandering amount .