JPH02141775A - Electrophotographic device - Google Patents

Abstract

PURPOSE:To prevent the size of an image from being changed after it is fixed and to eliminate color slippage and the deviation of the image by rotating a reflecting mirror where a photosensitive body is irradiated with light by the shaft of the reflecting mirror which is in parallel with the rotary shaft of the photosensitive body as a center. CONSTITUTION:The shafts 1a and 1b which are in parallel with the shaft of the photosensitive body 2 are provided on the reflecting mirror 1 where the photosensitive body 2 is directly irradiated with the light and a means 4 which rotates the reflecting mirror 1 with the shafts 1a and 1b as a center is provided, besides. Then, the position where a latent image is written is successively changed on the photosensitive body 2 by rotating the reflecting mirror 1. The latent image on the photosensitive body 2 is previously made large or small by as much as or as little as the elongation/contraction quantity of the image after it is fixed, so that the image has precise size when it is fixed. Thus, the magnification of the image in a paper feeding direction is prevented from being changed and the positional deviation of the image in the paper feeding direction is prevented from occurring when plural times of printing are executed on a piece of paper.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、熱又は圧力によってトナー等の現像剤を紙に
定着させる複写機等の電子写真装置に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic apparatus such as a copying machine that fixes a developer such as toner to paper by heat or pressure.

［従来の技術］ 第３図は電子写真装置の代表として複写機の概略図を示
す。原稿載置台５に載置された原稿６は光源７からの光
で照らされる。原稿６の照らされた部分は反射鏡８，９
，１０．１１により感光体ドラム１２に照射される。感
光体ドラム１２は光によって電荷の移動が行なわれるも
ので光が照射されると静電潜像が形成される。さらに現
像器１３によってトナー等の現像剤を感光体ドラム上に
のせ、現像し、現像剤を紙に転写帯電器１４で転写し、
定着器１５でトナーを定着する。[Prior Art] FIG. 3 shows a schematic diagram of a copying machine as a representative electrophotographic apparatus. A document 6 placed on a document table 5 is illuminated by light from a light source 7. The illuminated part of the original 6 is reflected by reflectors 8 and 9
, 10.11, the photosensitive drum 12 is irradiated with light. The photosensitive drum 12 is a device in which charge is transferred by light, and an electrostatic latent image is formed when the photosensitive drum 12 is irradiated with light. Furthermore, a developer such as toner is placed on the photoreceptor drum by the developing device 13 and developed, and the developer is transferred onto paper by the transfer charger 14.
The fixing device 15 fixes the toner.

［発明が解決しようとしている問題点］この種の装置で
は感光体上の静電潜像はトナーなどの現像剤で現像され
、現像剤を感光体から紙に転写した後現像剤に熱や圧力
を加えて紙に現像剤を溶かし込み、定着している。しか
し、現像剤を定着させるため現像剤を転写する紙に熱な
どを加える場合１０紙の水分が蒸発することにより、紙
が収縮する。また圧力を加えて、定着する場合、紙が押
しつぶされて伸びる。このように、紙に転写された画像
は定着後に大きさが変化する。さらに、１度画像を定着
された紙に、現像剤の色などを変えて複数回定着する場
合や、両面に画像を定着させる場合、紙の大きさが異な
ってくるため、色ずれ、画像ずれが生じるという欠点が
あった。[Problem to be solved by the invention] In this type of device, the electrostatic latent image on the photoreceptor is developed with a developer such as toner, and after the developer is transferred from the photoreceptor to paper, heat or pressure is applied to the developer. is added to dissolve the developer into the paper and fix it. However, when heat is applied to the paper to which the developer is transferred in order to fix the developer, the moisture in the paper evaporates, causing the paper to shrink. Also, when applying pressure to fix the paper, it is compressed and stretched. In this way, the size of the image transferred to paper changes after it is fixed. Furthermore, when fixing an image multiple times using different colors of developer, or when fixing an image on both sides, the size of the paper is different, resulting in color shift and image misalignment. The disadvantage was that it caused

Ｅ問題点を解決するための手段］ 上記問題点を解決する本発明は、感光体に直接照射する
反射鏡に感光体の軸と平行な軸を設け、ざらに該軸を中
心として、反射鏡を回転させる手段を設けて、反射鏡を
回転させて感光体上に潜像をかき込む位置を連続的に変
化させ、感光体上の潜像をあらかじめ、定着された後の
伸縮量分だけ大きめ、又は小さめにつくり、定着された
時に正確な大きさの画像になるようにしたものである。Means for Solving Problem E] The present invention which solves the above problems provides an axis parallel to the axis of the photoreceptor in the reflecting mirror that directly irradiates the photoreceptor, and the reflecting mirror is roughly centered around this axis. The reflecting mirror is rotated to continuously change the position at which the latent image is drawn onto the photoreceptor, and the latent image on the photoreceptor is enlarged in advance by the amount of expansion and contraction after being fixed. Alternatively, the image may be made smaller so that the image is of the correct size when fixed.

［実施例］ 第１図は本発明の１実施例を斜視図で示したものである
。[Embodiment] FIG. 1 is a perspective view showing one embodiment of the present invention.

また、第２図はその側面図を示す。Moreover, FIG. 2 shows its side view.

感光体ドラム２に光を照射する反射鏡１は軸ｌａ、Ｉｂ
が設けられていて軸１ａ、ｌｂを中心に回転可能である
。また、反射鏡１に入射する光は軸１ａ、１ｂを結んだ
線上で反射する。反射鏡１の感光体ドラム２の方を向い
ていない面には引張りコイルバネ２の１端が取り付けら
れて、他端は装置本体に固定されていて、反射鏡１をカ
ム４に押しつけている。The reflecting mirror 1 that irradiates light onto the photoreceptor drum 2 has axes la and Ib.
are provided and are rotatable around axes 1a and lb. Further, the light incident on the reflecting mirror 1 is reflected on a line connecting the axes 1a and 1b. One end of a tension coil spring 2 is attached to the surface of the reflecting mirror 1 not facing the photosensitive drum 2, and the other end is fixed to the main body of the apparatus to press the reflecting mirror 1 against the cam 4.

カム４が回転すると反射鏡１は軸１ａ、ｌｂを中心に揺
動し、感光体ドラム面上の照射位置が変化する。When the cam 4 rotates, the reflecting mirror 1 swings about the shafts 1a and lb, and the irradiation position on the photosensitive drum surface changes.

熱定着器を用いた場合で紙の縮みを補正する系を第２図
を用いて説明する。A system for correcting paper shrinkage when a thermal fixing device is used will be described with reference to FIG.

感光体ドラム２が矢印２ａの方向に回転している時、定
着後の紙の縮む量と同じたけ感光体ドラム上には画像が
伸びるようにかき込む必要があるため、感光体ドラム面
上の照射位置はドラム回転方向と反対方向に移動させる
。このため、カム４を矢印４ａの方向に回転させて反射
鏡１をＩＣの方向に回転させる。When the photoreceptor drum 2 is rotating in the direction of the arrow 2a, it is necessary to stretch the image onto the photoreceptor drum by the same amount as the paper shrinks after fixing, so the irradiation on the photoreceptor drum surface is The position is moved in the direction opposite to the drum rotation direction. Therefore, the cam 4 is rotated in the direction of the arrow 4a, and the reflecting mirror 1 is rotated in the direction of the IC.

カム４の形状は感光体ドラム面上で照射位置が等速でＢ
動するようになっていて、最大用紙サイズに対応する角
度だけ回転すると元の位置にもどるような駆動系になっ
ている。The shape of the cam 4 is such that the irradiation position is at a constant speed on the photoreceptor drum surface.
The drive system is such that it returns to its original position when rotated by an angle corresponding to the maximum paper size.

第４図にカム駆動系の１例を示す。FIG. 4 shows an example of a cam drive system.

１６はカム４と一体となっている被駆動ギヤ、１７は駆
動ギヤ、１８はカム４と一体となっている第１ストツパ
材、２０はカム４の基準位置に対応する位置に設けられ
た第２ストツパ材、１９は第１ストツパ材１８を第２ス
トツパ材２゜に接触する方向に力をおよぼす引張りコイ
ルバネ、２１　（ａ）、２１　　（ｂ）は被駆動ギヤ１
６と駆動ギヤ１７の軸間の位置だしをするための突当円
板、２２は被駆動ギヤ１６と駆動ギヤ１７を押しつける
引張りコイルバネ、２３は引張りコイルバネ２２がとり
つけられていて、被駆動ギヤ１６を取りつけている軸に
はめられているすべり軸受、２４は引張りコイルバネ２
２がとりつけられていて、駆動ギヤ１７を取りつけてい
る軸にはめられているすべり軸受で、ソレノイド２５の
プランジャーに取りつけられている。16 is a driven gear that is integrated with the cam 4; 17 is a drive gear; 18 is a first stopper member that is integrated with the cam 4; and 20 is a first stopper member that is provided at a position corresponding to the reference position of the cam 4. 2 stopper member 19 is a tension coil spring that applies force in the direction of contacting the first stopper member 18 with the second stopper member 2°; 21 (a) and 21 (b) are driven gears 1;
6 and an abutment disk for positioning between the axes of the driving gear 17; 22, a tension coil spring that presses the driven gear 16 and the driving gear 17; 23, the tension coil spring 22 is attached; 24 is a tension coil spring 2 fitted on the shaft to which it is attached.
2 is attached to the shaft to which the drive gear 17 is attached, and is a sliding bearing fitted to the plunger of the solenoid 25.

カム４は駆動ギヤ１７、被駆動ギヤ１６にょって、矢印
の方向へ回される。カム４が紙サイズに対応した角度だ
け回転したら、ソレノイド２５のスイッチが入り、プラ
ンジャをひきつける。プランジャがひきつけられること
で、駆動ギヤ＋７と被駆動ギヤ１６の歯が離れて、カム
４を回転させる駆動が切れて、引張りコイルバネ１９に
よって、カム４と一体になっている第１ストツパ材１８
が第２ストツパ材２０につきあたるまでカム４を矢印と
反対方向に回転させる。紙を１枚送るごとにこの動作が
繰り返される。ソレノイド２５がプランジャーを引くタ
イミングは紙サイズごとに決定されていて、装置が検知
した紙サイズによってカム４の回転角度が決定される。The cam 4 is rotated in the direction of the arrow by a driving gear 17 and a driven gear 16. Once the cam 4 has rotated an angle corresponding to the paper size, the solenoid 25 is switched on and attracts the plunger. When the plunger is attracted, the teeth of the driving gear +7 and the driven gear 16 are separated, and the drive for rotating the cam 4 is cut off, and the first stopper member 18, which is integrated with the cam 4 by the tension coil spring 19,
Rotate the cam 4 in the direction opposite to the arrow until it touches the second stopper member 20. This operation is repeated every time a sheet of paper is fed. The timing at which the solenoid 25 pulls the plunger is determined for each paper size, and the rotation angle of the cam 4 is determined depending on the paper size detected by the device.

［他の実施例］ 本実施例ではカムを用いて反射鏡を回転させたがモの他
の方法として、モーターで直接カムを回転させてもよい
。[Other Embodiments] In this embodiment, a cam is used to rotate the reflecting mirror, but as an alternative method, the cam may be directly rotated by a motor.

［発明の効果］ 以上説明したように感光体ドラムに光を照射する鏡を回
転させることで、 １、紙送り方向の画像の倍率変化が防げる。[Effects of the Invention] As explained above, by rotating the mirror that irradiates the photoreceptor drum with light,: 1. Changes in magnification of the image in the paper feeding direction can be prevented.

２．１枚の紙に複数回プリントする場合の、紙送り方向
の位置ずれが防げる。2. Prevents misalignment in the paper feeding direction when printing multiple times on one sheet of paper.

３　両面プリント時の紙送り方向の位置ずれが防げる。3. Prevents misalignment in the paper feeding direction during double-sided printing.

以上の効果がある。This has the above effects.

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

第１図は本発明の実施例である電子写真装置の部分図、 第２図は本発明の詳細な説明する説明図、第３図は一般
的な装置の概略図、 第４図は本発明の実施例に関係する反射鏡を回転させる
カムの駆動系を示す斜視図である。 １は反射鏡、２は感光体ドラム、 ３は引張りコイルバネ、 ４は反射鏡１を回転させるカムである。FIG. 1 is a partial diagram of an electrophotographic apparatus that is an embodiment of the present invention, FIG. 2 is an explanatory diagram explaining the present invention in detail, FIG. 3 is a schematic diagram of a general device, and FIG. 4 is a diagram of the present invention. FIG. 3 is a perspective view showing a cam drive system for rotating a reflecting mirror related to the embodiment. 1 is a reflecting mirror, 2 is a photosensitive drum, 3 is a tension coil spring, and 4 is a cam that rotates the reflecting mirror 1.

Claims (1)

【特許請求の範囲】[Claims] 原稿載置台に置かれた原稿を照らす光源又はレーザース
キャナーと原稿の光源によって照らされた部分又はレー
ザースキャナーからのレーザー光を１枚以上の反射鏡を
用いて感光体上に照射する光学系を持ち、感光体につく
られた潜像をトナーで現像し、トナーを紙に転写した後
、熱又は圧力で定着する定着器をもつ、複写機等の電子
写真装置において感光体上に光を照射する反射鏡を、該
反射鏡の感光体の回転軸と平行な軸を中心として回転さ
せることを特徴とする電子写真装置。It has a light source or laser scanner that illuminates the document placed on the document table and a part of the document illuminated by the light source or an optical system that uses one or more reflecting mirrors to irradiate the laser beam from the laser scanner onto the photoreceptor. , the latent image formed on the photoreceptor is developed with toner, the toner is transferred to paper, and then light is irradiated onto the photoreceptor in an electrophotographic device such as a copying machine that has a fixing device that fixes it with heat or pressure. An electrophotographic apparatus characterized in that a reflecting mirror is rotated about an axis parallel to a rotation axis of a photoreceptor of the reflecting mirror.