JPS60142379A - Both-surface image forming device - Google Patents

Both-surface image forming device

Info

Publication number
JPS60142379A
JPS60142379A JP58247861A JP24786183A JPS60142379A JP S60142379 A JPS60142379 A JP S60142379A JP 58247861 A JP58247861 A JP 58247861A JP 24786183 A JP24786183 A JP 24786183A JP S60142379 A JPS60142379 A JP S60142379A
Authority
JP
Japan
Prior art keywords
fixation
fixing
degree
copying
sheet
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
JP58247861A
Other languages
Japanese (ja)
Inventor
Tomohiro Aoki
青木 友洋
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP58247861A priority Critical patent/JPS60142379A/en
Publication of JPS60142379A publication Critical patent/JPS60142379A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03GELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00Apparatus for electrographic processes using a charge pattern
    • G03G15/20Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2039Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature

Abstract

PURPOSE:To prevent curling and wrinkling, save electric power, and prolong the life of a roller, bearing motor, etc., by setting the degree of fixation lower in 1st surface fixation than in one-surface image formation, and setting the fixation degree of the 2nd surface lower than that of the 1st surface at the time of both- surface image formation. CONSTITUTION:A heat source 53 is provided with a main heating body 53a and two auxiliary heating bodies 53b and 53c. All the heating bodies are powered on in the fixation of one-surface copying operation, the main heating body 53a and auxiliary heating body 53c are powered on in the 1st surface copying of both-surface copying operation, and only the main heating body 53a is powered on with the signal for the copy start of the 2nd surface. The detection level of a thermistor is varied to control the set surface temperature of the fixing roller 51 to 190 deg.C in the 1st surface copying of both-surface copying operation and 160 deg.C in the 2nd surface copying. Consequently, the heating value applied to a sheet is reduced successively and the degree of fixation is decreased.

Description

【発明の詳細な説明】 本発明は転写材(以下、シートと称す)の両面に画像を
形成する複写機等の両面画像形成装置に関するものであ
り、特にシート上のトナー像を定着させる定着装置の改
良を図った両面画像形成装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a double-sided image forming apparatus such as a copying machine that forms images on both sides of a transfer material (hereinafter referred to as a sheet), and particularly to a fixing device that fixes a toner image on a sheet. The present invention relates to a double-sided image forming apparatus that has been improved.

従来電子写真法を利用してシートの表裏両面に複写像を
形成する所謂両面複写を行うための複写機がすでに種々
提案実α、されている。例えは、シートの片面に通常の
片面複写を行い、その片面初写済のシートを再び元の給
紙部、或いは別の第2の給紙部へ導き、次にシートの他
面を再び複写処理部へ送り込んで裏面に表面と同じよう
に複写を行う形式のものがある。これは複写処MII部
が一組でよくまた構成が簡易でコンパクトなものとなる
ことから、爪も実用的な両面複写機である。この形式の
両面複写機においてシート上にトナー像を定着させるた
めの定着器としては、加熱、圧接された一対のローラー
間にシートを通過せしめることにより定着を行う熱ロー
ラー定着器が効率の高いものとして知られている。この
熱ローラー定着において定着の程度を左右する要素はニ
ップ量である。ニップ量はローラーの圧接力によシ生ず
る二ッゾ巾、加熱量及びシートの移動速度の関数であシ
、定着度を決定するものである。
Conventionally, various copying machines have been proposed and implemented for performing so-called double-sided copying, in which copy images are formed on both the front and back sides of a sheet using electrophotography. For example, a normal one-sided copy is performed on one side of a sheet, the first side of the sheet is guided again to the original paper feed section, or another second paper feed section, and then the other side of the sheet is copied again. There is one that sends the paper to a processing section and copies the back side in the same way as the front side. This is a double-sided copying machine with a practical claw because only one set of the MII section is required and the structure is simple and compact. In this type of double-sided copying machine, the most efficient fixing device is a heated roller fixing device that fixes the toner image on the sheet by passing the sheet between a pair of rollers that are heated and pressed together. known as. In this heat roller fixing, the factor that influences the degree of fixing is the nip amount. The nip amount is a function of the width of the roller produced by the pressing force of the roller, the amount of heating, and the moving speed of the sheet, and determines the degree of fixation.

ところで従来の両面複写機では第1面の定着と第2面の
定着は共に同一のニップ量で行なわれるだけでなく、圧
接力、加熱量、移動速度も全く同−tで行なわれている
。しか17定着されるシートの状態は第1固定着時と第
2面定着時とは大巾に異なる。すなわち、シートに通常
含まれている水分は第1面の定着を終了したシートでは
ある程度−除去されておシさらに第1画定着後のシート
は余熱を有している等である。
By the way, in conventional double-sided copying machines, not only the fixing of the first side and the fixing of the second side are performed with the same nip amount, but also with the same pressing force, heating amount, and moving speed -t. However, the state of the sheet to be fixed on the first surface is significantly different from that when the first surface is fixedly fixed and when the second surface is fixed. That is, the moisture normally contained in the sheet has been removed to some extent after the first side has been fixed, and the sheet after the first image has been fixed has residual heat.

また第1面を高い定着度で行うとシートにシワ。Also, if the first side is fixed at a high fixing rate, the sheet will wrinkle.

カールが生じ易くこれが第2面複写のためのシート搬送
、中継トレイへの収納、そこからの再給紙、第2面像の
転写等、それ以降のプロセスに支障を来す恐れがある。
Curling is likely to occur, and this may interfere with subsequent processes such as sheet conveyance for second-side copying, storage in a relay tray, refeeding from there, and transfer of second-side images.

従って従来の如く第1面の定着も第2面の定着も同じニ
ラf量で行うことは必ずしも良策でない。
Therefore, it is not necessarily a good idea to perform fixing on the first side and fixing on the second side with the same chive f amount as in the past.

そこで本発明は上記従来装置の欠点を解消し、カールや
しわの発生の防止、省電力化及びローラー、軸受モータ
ー等の長寿命化を実現した両面画像形成装置を提供する
ことを目的としている。
SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a double-sided image forming apparatus which eliminates the drawbacks of the conventional apparatus and which prevents the occurrence of curls and wrinkles, saves power, and extends the life of rollers, bearing motors, etc.

本発明の要旨は、シートの第1面に形成されたトナー像
の定着と、その後シートの第2面に形成されたトナー像
の定着を行う共通の熱ローラー定着器を有する両面画像
形成装置において両面画像形成の場合の第1固定着時の
定着度を片面画像形成の場合の定着度よシも低くシ、且
つ両面画像形成の場合の第2回定着度を第1回定着度よ
シ低くすることを特徴どする両面画像形成装置にある。
The gist of the present invention is to provide a double-sided image forming apparatus having a common heat roller fixing device that fixes a toner image formed on a first side of a sheet and then fixes a toner image formed on a second side of a sheet. In the case of double-sided image formation, the degree of fixation at the first fixation is lower than the degree of fixation in the case of single-sided image formation, and the degree of fixation at the second time in the case of double-sided image formation is lower than the degree of fixation at the first time. A double-sided image forming apparatus is characterized in that:

以下本発明の一実施例を図面を用いて詳細に説明する。An embodiment of the present invention will be described in detail below with reference to the drawings.

第1図は、本発明の一実施例に係る両面複写機の側面図
である。
FIG. 1 is a side view of a double-sided copying machine according to an embodiment of the present invention.

図に於いて、原稿1は原稿台の透明板2上に置かれ、光
学系は移動反射ミラー3・4・レンズ5及び固定反射ミ
ラー6・7によシ構成されている。
In the figure, an original 1 is placed on a transparent plate 2 of an original table, and an optical system is composed of movable reflecting mirrors 3, 4, a lens 5, and fixed reflecting mirrors 6, 7.

即ち原稿1は、照明ランプ8と一体となって移動する移
動反射ミラー3と、この移動反射ミラー3のそれの1/
2の移動速度をもって同一方向へ移動する移動反射ミラ
ー4により光路長を等しく保たれながら、更にレンズ5
と固定反射ミラー6・7を経てスリット露光され、感光
ドラム9上へ結像される。ここで感光ドラム9の表面は
、光導電層の上を透明絶縁層で覆った感光体からなシ、
感光体はその回転につれてまず高圧電源1oから正の高
電圧を供給されているグラス帯電器11にょシ正に帯電
させられる。続いて露光部12に達すると、照明ランフ
08に照明された原稿台の透明板2上の原稿1の像が移
動反射ミラー3・4及びレンズ5・同定反射ミラー6・
7によ勺ドラム9上に結像される。感光ドラム9は原稿
像を露光されると同時に、高圧電源10からAC高電圧
を供給されている交流コロナ放電器13によシ交流コロ
ナ放電を受ける。次いて、全面露光ランプ14による全
面露光を受けて、感光ドラム9表面に静電潜像が形成さ
れ、次いで現像器15に到る。現像は磁気スリーブ方式
による粉体現像によシ行なわれ、静電潜像は顕像化され
る。側方、シートは給紙部よシ送シ出されてくる訳であ
るが、給紙部の中継トレイ17・第1給紙台18は力士
ットタイグであり、第2給紙台19は自動紙昇降装置を
有する比較的多数枚積載可能なデツキタイプである。中
継トレイ17は、両面複写時の給紙台としても用いられ
る。給紙部17・18・19のいずれかよシ送られてき
たシートは、その第1面がドラム9に密着させられる。
That is, the document 1 is moved between the movable reflection mirror 3 that moves together with the illumination lamp 8 and 1/1 of the movable reflection mirror 3.
While the optical path length is kept equal by the movable reflecting mirror 4 which moves in the same direction at a moving speed of 2, the lens 5
The light is subjected to slit exposure through fixed reflection mirrors 6 and 7, and is imaged onto a photosensitive drum 9. Here, the surface of the photosensitive drum 9 is made of a photosensitive member with a photoconductive layer covered with a transparent insulating layer.
As the photoreceptor rotates, it is first positively charged by a glass charger 11 to which a high positive voltage is supplied from a high voltage power source 1o. Subsequently, when reaching the exposure section 12, the image of the document 1 on the transparent plate 2 of the document table illuminated by the illumination lamp 08 is reflected by the movable reflection mirrors 3, 4, the lens 5, the identification reflection mirror 6, and the image of the document 1 on the transparent plate 2 of the document table.
An image is formed on the optical drum 9 by 7. The photosensitive drum 9 receives an AC corona discharge from an AC corona discharger 13 to which an AC high voltage is supplied from a high voltage power supply 10 at the same time as the original image is exposed to the photosensitive drum 9 . Next, an electrostatic latent image is formed on the surface of the photosensitive drum 9 by full exposure by the full surface exposure lamp 14, and then reaches the developing device 15. Development is performed by powder development using a magnetic sleeve method, and the electrostatic latent image is visualized. On the side, the sheets are fed out from the paper feed section, but the relay tray 17 and first paper feed table 18 of the paper feed section are automatic paper feed trays, and the second paper feed table 19 is an automatic paper feed section. It is a deck type that has a lifting device and can load a relatively large number of sheets. The relay tray 17 is also used as a paper feed table during double-sided copying. The first side of the sheet fed from one of the paper feed sections 17, 18, and 19 is brought into close contact with the drum 9.

そこで転写帯電器20は高圧電源10によシ正の帯電を
シートに行い、ドラム9上の像をシート上に転写する。
Therefore, the transfer charger 20 positively charges the sheet using the high-voltage power supply 10, and transfers the image on the drum 9 onto the sheet.

転写を終えたシートは、分離部21でドラム9から分離
され、搬送経路22を経て定着器[23に導かれる。定
着装置23は、加熱源53を有する定着ローラー51及
び表面にゴム層を有する加圧ローラー52によシ構成さ
れておシ、互いに圧接したこれらローラー間を粉体像を
窄するシートが通過し、圧力及び熱によシ粉体像をシー
ト上に定着せしめる。
After the transfer, the sheet is separated from the drum 9 by a separation section 21 and guided to a fixing device [23] via a conveyance path 22. The fixing device 23 is composed of a fixing roller 51 having a heat source 53 and a pressure roller 52 having a rubber layer on its surface. A sheet for narrowing the powder image passes between these rollers that are in pressure contact with each other. , the powder image is fixed onto the sheet by pressure and heat.

定着装置23を通過したシートは、両面複写の場合搬送
経路27aへ送シ出され、さらに中継トレイ17へ第1
面に形成された画像側を上面にして収納される。同様の
複写過程を経て設定枚数分のシートが中継トレイ17内
に積載される。次にコピーボタン(図示せず)オンの信
号によシ、中継トレイ17内の第1面複写法シートは搬
送路46へ送シ出され、シートの第2面に感光体ドラム
9上のトナー像が転写された後、搬送路22・定着装置
23そして搬送経路27bあるいは27cを経てソータ
30あるいはトレイ31内へ排出される。以下設定枚数
分だけ同様の複写過過を行う。
The sheet that has passed through the fixing device 23 is sent to the conveyance path 27a in the case of double-sided copying, and is further transferred to the first relay tray 17.
It is stored with the image formed on the surface facing up. A set number of sheets are stacked in the relay tray 17 through a similar copying process. Next, in response to a signal from a copy button (not shown) turned on, the first side copy method sheet in the relay tray 17 is sent to the conveyance path 46, and the toner on the photoreceptor drum 9 is applied to the second side of the sheet. After the image is transferred, it is discharged into the sorter 30 or tray 31 via the conveyance path 22, the fixing device 23, and the conveyance path 27b or 27c. Repeat the same copying process for the set number of copies.

なお片面複写だけの場合には、定着装置23を通過した
シートは搬送経路27bあるいは27eへ導かれてソー
タ30あるいはトレイ31内へ搬出される。このように
搬送経路は通常実線の27cの位置にあシ、必要によシ
信号を受けて点線27aあるいは27bの位置に切撓わ
るものである。
Note that in the case of only one-sided copying, the sheet that has passed through the fixing device 23 is guided to a conveyance path 27b or 27e, and is carried out into a sorter 30 or a tray 31. In this way, the conveyance path is normally set at the position 27c shown by the solid line, and is bent to the position shown by the dotted line 27a or 27b in response to an optional signal.

第2図は本実施例における第1図に示した定着装置23
の熱源53の詳細図を示したものである。
FIG. 2 shows the fixing device 23 shown in FIG. 1 in this embodiment.
5 shows a detailed diagram of the heat source 53 of FIG.

即ち熱源53には主発熱体53aと2つの補助発熱体5
3b・53cが設けられておシ、片面複写の定着時にお
いては主発熱体53a1補助発熱体53b・53cの全
てに通電されているが、両面複写の第1面複写の場合は
、その複写開始の信号によシ補助発熱体53bへの通電
が断たれ、主発熱体53a及び補助発熱体53cのみに
通電される。この状態で第1面複写が終了し第2面複写
開始の信号により、補助発熱体53eへの通電も断たれ
、主発熱体53aのみの通電状態となる。上記において
、定着ローラー51表面温度は片面複写のときには設定
湯度1.90??、両面複写の第1面複写のときには同
170C%第2而杉写のとき1には同160Cとなるよ
うにサーミスタの検知レベルを変化させて制御を行って
おシ、これによりシートに与えられる熱量は順に減ぜら
れ定着度は低くなる。この温度変更は即応性に若干欠け
るが、両面コピーを多数枚作成する場合には効果がある
That is, the heat source 53 includes a main heating element 53a and two auxiliary heating elements 5.
3b and 53c are provided, and during the fixing of single-sided copying, the main heating element 53a1 and the auxiliary heating elements 53b and 53c are all energized, but in the case of copying on the first side of double-sided copying, when the copying starts. According to the signal, the power to the auxiliary heat generating element 53b is cut off, and only the main heat generating element 53a and the auxiliary heat generating element 53c are energized. In this state, the first side copying is completed, and in response to the signal to start the second side copying, the auxiliary heating element 53e is also cut off, and only the main heating element 53a is energized. In the above, the surface temperature of the fixing roller 51 is set at 1.90 for single-sided copying. ? When copying the first side of double-sided copying, the level is 170C; when copying the second side, the level is 160C. The amount of heat is gradually reduced and the degree of fixing is lowered. Although this temperature change is somewhat less responsive, it is effective when making a large number of double-sided copies.

第3図、第4図、第5図は本発明の他の実施例の定着装
置の断面図であり、第1図中の定着装$23に相当する
ものである。本実施例による両面複写機の全体的構成は
第1図と同様である。
3, 4, and 5 are sectional views of fixing devices according to other embodiments of the present invention, which correspond to fixing device $23 in FIG. 1. The overall configuration of the double-sided copying machine according to this embodiment is the same as that shown in FIG.

第3図は非通紙時の断面、第4図は片面複写のときの、
第5図は両面複写の第1面通紙のときの断面図である。
Figure 3 shows the cross section when paper is not passing through, Figure 4 shows the cross section when copying on one side.
FIG. 5 is a sectional view when the first side of the duplex copy is being passed.

これらの図において、51は定着ローラであり、内部に
熱源53を有している。52は加圧ローラである。定着
ロー251の表面には表面温度を制御するためのサーミ
スタ55が押し当てられておシこのサーミスタ55にょ
シ上記熱源53がオン・オフ制御されるようになってい
る。また、加圧ローラ52の両端部を支持するアーム5
7は一端が軸支され他端が圧縮バネ58を介してレバー
59の一端と結合しておシ、このレバー59は他端にカ
ム60のビン60′が係合され、このカム6oの回転忙
よ、9b点を中心として図のA又はB方向に揺動して前
記圧縮・ぐネ58を圧縮、伸長させるように設けられて
いる。67は加圧ローラの表面弾性部である。
In these figures, 51 is a fixing roller, which has a heat source 53 inside. 52 is a pressure roller. A thermistor 55 for controlling the surface temperature is pressed against the surface of the fixing row 251, and the thermistor 55 turns on and off the heat source 53. Also, an arm 5 supporting both ends of the pressure roller 52 is provided.
7 has one end supported by a shaft and the other end connected to one end of a lever 59 via a compression spring 58. The other end of this lever 59 is engaged with a pin 60' of a cam 60, and the rotation of this cam 6o It is provided so as to compress and expand the compression/gun 58 by swinging in the direction A or B in the figure around point 9b. 67 is a surface elastic portion of the pressure roller.

非通紙時妊おいては第3図に示す如くレバー59はカム
60によシ偏倚されておらず、加圧ローラ52は定着ロ
ーラ51に対し目IF隔状態にある。他方、油紙時には
、レバー59は図示しないモータによシカムロ0が回転
されるととにより偏倚されA方向に揺動し、アーム57
は圧縮バネ58の′バネ力により軸aを中心として回動
するととによシ、加圧ローラ52を定着ローラ51に加
圧接触させる。籐廣紘加圧〜〜箋へ層隻箋漏椰性宵π箋
鳩へさて、この定着装置における定着動作について以下
に述べる。まず片面のみの複写の場合には、複写開始信
号によシ駆動モータ(図示せず)にょシ定着ローラー5
1及び加圧ローラー52が回転を開始し、さらに加圧モ
ーター(図示せず)が動作してカム60が回転し、その
ビン60’がレバー59を偏倚して第4図に示す如く加
圧ローラー52を定着ローラー51に圧接せしめる。こ
のカム6゜の外周部の凹部64をカム6oの近傍に設け
たセンサー61が検出すると加圧モーター従ってカム6
0は停止されて、該モーター自身が有するブレーキ機構
によシ前記一対のローラー5工・52の加圧状態が保持
されるようにロックされる。この状態を第4図に示す。
When paper is not being passed, the lever 59 is not biased by the cam 60 as shown in FIG. 3, and the pressure roller 52 is spaced IF from the fixing roller 51. On the other hand, when the paper is oiled, the lever 59 is biased and swung in the A direction when the Shikamuro 0 is rotated by a motor (not shown), and the arm 57
When the fixing roller 52 is rotated about the axis a by the spring force of the compression spring 58, the pressure roller 52 is brought into pressure contact with the fixing roller 51. The fixing operation of this fixing device will be described below. First, in the case of copying only one side, the drive motor (not shown) is activated by the copying start signal to fix the fixing roller 5.
1 and the pressure roller 52 start rotating, and the pressure motor (not shown) operates to rotate the cam 60, and the bottle 60' biases the lever 59 to apply pressure as shown in FIG. The roller 52 is brought into pressure contact with the fixing roller 51. When the sensor 61 installed near the cam 6o detects the recess 64 on the outer periphery of the cam 6o, the pressure motor and the cam 6
0 is stopped, and the pair of rollers 5 and 52 are locked in a pressurized state by the brake mechanism of the motor itself. This state is shown in FIG.

なおこのカム6oの停止位置は、後の加圧解除時のカム
6oの動きを自動的に生じさせるために、レバー59に
対して逃は勝手位置としておくことが好ましい。このよ
うなレバー59の動きによシ、アーム57は圧縮バネ5
8のバネ力を受けて加圧ローラ52を定着ローラ51に
加圧接触させ、これらローラは加圧接触状態で回転する
。片面複写の場合、未定着画像を有するシートは上記ロ
ーラー間を通過することによシ定着せしめられる。
It is preferable that the stop position of the cam 6o is set at a free position with respect to the lever 59 so that the cam 6o will automatically move when the pressurization is released later. Due to this movement of the lever 59, the arm 57 is moved by the compression spring 5.
The pressure roller 52 is brought into pressure contact with the fixing roller 51 under the force of a spring 8, and these rollers rotate in a state of pressure contact. In the case of single-sided copying, the sheet with the unfixed image is fixed by passing between the rollers.

以上述べた片面被写の場合のように四部64をセンサー
61が検出したときの停止位置における定着動作を第1
位置の定着と称する。
The fixing operation at the stop position when the sensor 61 detects the fourth part 64 as in the case of the one-sided object described above is performed in the first
This is called position fixation.

通常片面イ11写が終了すると、コピーシートは前記経
路27c又は27bを経て機外へ排出され、この機外排
出完了の信号によシ、ローラー51・52の回転停止お
よびカム60を駆動する前記加圧モータのブレーキ11
(除が行なわれる。このとき前記した如くカム60は逃
は勝手状態にレバー59に当接しているので、該モータ
のブレーキが解除されるとバネ58の反発力、およびロ
ーラ52のN搦等によりレバー59との安定接触位#i
′(第3図に示した位置)!、で逆回転せしめられる。
Normally, when the single-sided copying is completed, the copy sheet is ejected from the machine via the path 27c or 27b, and in response to this signal indicating completion of ejection, the rollers 51 and 52 stop rotating and the cam 60 is driven. Pressure motor brake 11
(Removal is carried out. At this time, as mentioned above, the cam 60 is in contact with the lever 59 in the release state, so when the brake of the motor is released, the repulsive force of the spring 58 and the N-stroke of the roller 52, etc. Stable contact position #i with lever 59 due to
’ (position shown in Figure 3)! , the rotation is reversed.

両面複写の第1面複写の場合には、その複写開始の信号
によシ、ローラ対の回転及び加圧モータひいてはカム6
00回転が同様に始まるが、この場合、第5図の如く、
カム60の外周部の四部63をセンツー61が検出した
ときカム60は停止し、前記したブレーキ機構にょシ、
この位置°でロックされ、ローラー対はとれに対応した
加圧状態に保持される。第1面は上記した加圧状態のシ
ートがローラー対間を通過することにょシ定着ゼしめら
れる。この状態を第5図に示す。
In the case of copying the first side of double-sided copying, the copying start signal causes the rotation of the roller pair and the pressure motor, as well as the cam 6.
00 rotation starts in the same way, but in this case, as shown in Figure 5,
When the Sentsu 61 detects the four parts 63 on the outer circumference of the cam 60, the cam 60 stops, and the brake mechanism described above
Locked at this position, the roller pair is maintained under pressure corresponding to the break. The first surface is fixed by passing the pressurized sheet as described above between a pair of rollers. This state is shown in FIG.

以上述べた両面複写の第1面複写(/、)ときの如くコ
ピーの凹部63をセンサー61が検出したときの停止位
置における定着動作を第2位置の定着と称する。
The fixing operation at the stop position when the sensor 61 detects the concave portion 63 of the copy, as in the first side copy (/,) of the double-sided copy described above, is referred to as second position fixing.

次に両面複写の第2面複写の場合には、その複写開始の
信号により同様にローラー対の回転及びカム60の回転
が始まるが、この場合、カム6゜の外周部の四部62を
センサー61が検u」シたときカム60が停止し、前記
したブレーキ機構により、この位置でロックされ、ロー
ラー対はこれに対応した加圧状態に保持される。第2面
は上記した加圧状態のローラー対間をシートが通過する
ことにより定着せしめられる。以上述べた両複写の第2
面の場合のように四部63をセンサー61が検出したと
きの停止位置における定着動作を第3位置の定着と称す
る。
Next, in the case of copying on the second side of double-sided copying, the rotation of the roller pair and the rotation of the cam 60 are similarly started in response to the copy start signal. When the cam 60 is detected, the cam 60 stops and is locked in this position by the brake mechanism described above, and the roller pair is maintained in a pressurized state corresponding to this. The second surface is fixed by passing the sheet between the pair of rollers under pressure. The second copy of both copies mentioned above.
The fixing operation at the stop position when the sensor 61 detects the four portions 63 as in the case of the surface is referred to as third position fixing.

カム60の駆動回転方向(矢印)で見て凹部62゜凹部
63及び凹部64は順次下流側に位置し、凹部64に対
するカム60の停止位置でレバー59が最下点に最も近
くなる。従って第2面、第1面片面の11F1に加圧力
−5高くなるっつl)この順に定着度は高くなっている
When viewed in the drive rotational direction (arrow) of the cam 60, the recess 62, the recess 63, and the recess 64 are sequentially located on the downstream side, and the lever 59 is closest to the lowest point at the stop position of the cam 60 with respect to the recess 64. Therefore, the pressing force on the second side and 11F1 on one side of the first side increases by -5 (1) The degree of fixing increases in this order.

第6図は上記三通りの加圧動作を示すフローチ倉−トで
ある。
FIG. 6 is a flow chart showing the three pressurizing operations described above.

以上述べた二つの実施例のように、ローラ設定温度もし
くは加圧力を変化さぜることによシ、それぞれ、片面〉
第1面〉第2面となるように定着度を変えることができ
るが、この定7j度の順序を達成するには、上記二実施
例の如くローラ温度又は加圧力を三3+1pに変更する
手段を設けずとも可能である。例えは、第2回に示した
熱温の格成を主発熱源53a1補助発熱源53bのみと
し、さらに第3図、第4図、第5図に示したカムの凹部
を63・64のみの二つとしてカム60の停止位mを第
1位信、第2位置のみとするととによシ。
As in the two embodiments described above, by changing the roller setting temperature or pressing force, it is possible to
The fixing degree can be changed so that the first side>the second side, but in order to achieve this constant 7j degree order, it is necessary to change the roller temperature or pressing force to 33+1p as in the above two embodiments. It is possible without providing. For example, the heat temperature classification shown in Part 2 is set to only the main heat generating source 53a1 and the auxiliary heat generating source 53b, and the recesses of the cam shown in Figs. 3, 4, and 5 are set to only 63 and 64. It would be better if the stopping positions m of the cam 60 were set to only the first position and the second position.

ローラ設定温度と加圧力を共に変化さぜれはよい。It is good to change both the roller setting temperature and the pressing force.

−例を述べれば、片面複写における定着を設定温度19
0C,加圧位置を第1位置で行い、両面複写の第1画定
着を設定温度170c、加圧位置を第1位置で行い、次
に第2固定着を設定温度170C1加圧位置を第2位置
で行えはよい。また上記の例では第1画定着で温度を変
化させ次に第2固定着では加圧力を変化させたが、この
逆でも前記11@序の定着度を達成できる。すなわち、
第1画定着のとき加圧力を、第2固定着のとき設定温度
を変化させてもよい。
- To give an example, the fixing temperature for single-sided copying is set to 19
0C, the pressure position is set at the first position, the first image fixing of double-sided copying is carried out at the set temperature 170C, the pressure position is set at the first position, and then the second fixing is carried out at the set temperature 170C, the pressure position is set at the second position. It is good to do it in a certain position. Further, in the above example, the temperature was changed in the first image fixing, and then the pressure was changed in the second fixing, but even in the opposite case, the fixing degree of the above-mentioned 11@ order can be achieved. That is,
The pressing force may be changed during the first image fixing, and the set temperature may be changed during the second image fixing.

つまシ、本発明における定着度を片面〉第1面〉第2面
にするには、ローラ設定温度及び加圧力をそれぞれ変化
させる組合せにょシ可能であり、設定温度の度合、加圧
力の度合等を考慮すればその組合せは数多く考えられる
In order to set the degree of fixing in the present invention to one side, the first side, and the second side, it is possible to use a combination of changing the roller setting temperature and pressing force, and the setting temperature, pressing force, etc. Considering this, many combinations can be considered.

定着度を、片面〉第1面〉第2面となるようにすること
により、第1面に対しては仮定着として片面捨写よシも
低い定着度を与え、使用されているシートが薄手紙の場
合には第1画定着によシ充分に除濤され、余熱が残って
いるため、第2回定着では定着度をさらに低くして十分
に定着の目的を達する。コピー処理能力が速い高速機に
おいても、この傾向が強いので上記順序の定着度は効果
がある。さらにトナーの定着度が温度依存性の強いもの
か、圧力依存性の強いものかによって定着度が直ちにニ
ッグ量とはならず、上記の定着度の順序で効果的定着が
可能である。
By setting the fixing degree to one side, the first side, and the second side, a low fixing degree is given to the first side even when one side is printed as temporary adhesion, and the sheet used is thin. In the case of a letter, the heat is sufficiently removed during the first image fixing and some residual heat remains, so the degree of fixing is further lowered in the second image fixing to fully achieve the purpose of fixing. This tendency is strong even in high-speed machines with high copy processing capacity, so the degree of fixation in the above order is effective. Further, depending on whether the degree of fixation of the toner is strongly dependent on temperature or pressure, the degree of fixation does not immediately become the amount of nigration, and effective fixing is possible in the order of the degree of fixation described above.

以上本発明によればシートのシワ、カール等を低減でき
、かつ合理的で省電力化、長寿命化をも実現した両面画
像装置が得られる。
As described above, according to the present invention, it is possible to obtain a double-sided image device that can reduce wrinkles, curls, etc. of sheets, and also realizes rational power saving and long life.

【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両面複写機の側断面図
、第2図は同実施例における定着装置加熱源を示す図、
第3図、第4図、第5図は本発明の他の実施例における
定着装置の異る状態を示す図、第6図は該実施例の定着
装置のローラ加圧及び解除動作を示1′フローチャート
である。 9・・・感光ドラム 17・・・中継トレイ18.19
・・・給紙台 20・・・転写帯電器23・・・定着装
置 30・・・ソータ31・・・排出トレイ 51・・
・定着ローラー52・・・加圧ローラー 53・・・加
熱源55・・・サーミスタ 57・・・アーム58・・
・圧縮ハネ 59・・・レバー60・・・カム 61・
・・センサー 63.64・・・四部 見5図
FIG. 1 is a side sectional view of a double-sided copying machine according to an embodiment of the present invention, and FIG. 2 is a diagram showing a heat source of a fixing device in the same embodiment.
3, 4, and 5 are diagrams showing different states of the fixing device in another embodiment of the present invention, and FIG. 6 shows the roller pressing and releasing operations of the fixing device in the embodiment. 'This is a flowchart. 9... Photosensitive drum 17... Relay tray 18.19
...Paper feed tray 20...Transfer charger 23...Fixing device 30...Sorter 31...Ejection tray 51...
-Fixing roller 52...Pressure roller 53...Heat source 55...Thermistor 57...Arm 58...
・Compression spring 59...Lever 60...Cam 61・
...Sensor 63.64...Four parts 5 diagrams

Claims (1)

【特許請求の範囲】[Claims] シートの第1面に形成されたトナー像の定着と、その後
シートの第2面に形成されたトナー像の定着を行う共通
の熱ローラー定着器を有する両面画像形成装置において
、両面画像形成の場合の第1面定着時の定着度を片面画
像形成の場合の定着度よりも低くシ、且つ両面画像形成
の場合の第2回定着度を第1画定着度より低くすること
を特徴とする両面画像形成装置。
In the case of double-sided image formation in a double-sided image forming apparatus having a common thermal roller fixing device that fixes the toner image formed on the first side of the sheet and then fixes the toner image formed on the second side of the sheet. The degree of fixation during fixation on the first side is lower than the degree of fixation in the case of single-sided image formation, and the degree of fixation on the second side in the case of double-sided image formation is lower than the degree of fixation on the first image. Image forming device.
JP58247861A 1983-12-29 1983-12-29 Both-surface image forming device Pending JPS60142379A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58247861A JPS60142379A (en) 1983-12-29 1983-12-29 Both-surface image forming device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58247861A JPS60142379A (en) 1983-12-29 1983-12-29 Both-surface image forming device

Publications (1)

Publication Number Publication Date
JPS60142379A true JPS60142379A (en) 1985-07-27

Family

ID=17169729

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58247861A Pending JPS60142379A (en) 1983-12-29 1983-12-29 Both-surface image forming device

Country Status (1)

Country Link
JP (1) JPS60142379A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62144177A (en) * 1985-12-19 1987-06-27 Ricoh Co Ltd Automatic both sides copying machine
JPS649267U (en) * 1987-07-03 1989-01-18
JPH10222021A (en) * 1997-02-12 1998-08-21 Ricoh Co Ltd Color image forming device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5492749A (en) * 1977-12-29 1979-07-23 Ricoh Co Ltd Heat fixing device
JPS58120283A (en) * 1982-01-12 1983-07-18 Canon Inc Heat fixation device
JPS58142363A (en) * 1982-02-17 1983-08-24 Canon Inc Image former

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5492749A (en) * 1977-12-29 1979-07-23 Ricoh Co Ltd Heat fixing device
JPS58120283A (en) * 1982-01-12 1983-07-18 Canon Inc Heat fixation device
JPS58142363A (en) * 1982-02-17 1983-08-24 Canon Inc Image former

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62144177A (en) * 1985-12-19 1987-06-27 Ricoh Co Ltd Automatic both sides copying machine
JPS649267U (en) * 1987-07-03 1989-01-18
JPH10222021A (en) * 1997-02-12 1998-08-21 Ricoh Co Ltd Color image forming device

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