JPH0627855A - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JPH0627855A JPH0627855A JP4179894A JP17989492A JPH0627855A JP H0627855 A JPH0627855 A JP H0627855A JP 4179894 A JP4179894 A JP 4179894A JP 17989492 A JP17989492 A JP 17989492A JP H0627855 A JPH0627855 A JP H0627855A
- Authority
- JP
- Japan
- Prior art keywords
- fixing
- temperature
- recording material
- size
- heater
- 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.)
- Granted
Links
Landscapes
- Control Or Security For Electrophotography (AREA)
- Fixing For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は複写機、プリンタ等の画
像形成装置に用いられ記録材上の未定着画像を定着する
定着装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device used in an image forming apparatus such as a copying machine or a printer for fixing an unfixed image on a recording material.
【０００２】（背景技術）未定着画像を定着する定着装
置としては効率等の面から熱ローラ方式が広く用いられ
ている。(Background Art) As a fixing device for fixing an unfixed image, a heat roller system is widely used in terms of efficiency and the like.
【０００３】この熱ローラ方式では装置の軽量化やウェ
イトタイムの短縮化のために熱ローラの芯金を薄くし熱
ローラを薄肉化することが考えられている。In this heat roller system, it is considered that the core metal of the heat roller is made thin and the heat roller is made thin in order to reduce the weight of the apparatus and shorten the wait time.
【０００４】このように熱ローラの芯金を薄くすること
で軽量化及びウェイトタイムを短縮できるが、芯金によ
る熱伝導が低下し記録材に熱を奪われない非通紙部の昇
温が大きい。By thus thinning the core metal of the heat roller, the weight can be reduced and the wait time can be shortened, but the heat conduction by the core metal is reduced and the temperature rise of the non-sheet passing portion where heat is not absorbed by the recording material. large.
【０００５】そこで記録材のサイズや連続定着回数に応
じて通電するヒータを切換えるなどの非通紙部昇温対策
をとることが考えられる。Therefore, it is conceivable to take measures to raise the temperature of the non-sheet passing portion by switching the heater to be energized depending on the size of the recording material and the number of continuous fixings.
【０００６】また、ウェイト解除後の初期は装置が十分
に暖まっておらず定着性が悪いため初期時だけ熱ローラ
の定着温度を高くすることも考えられる。Further, since the apparatus is not sufficiently warmed and the fixing property is poor in the initial stage after the release of the weight, it may be possible to increase the fixing temperature of the heat roller only in the initial stage.
【０００７】[0007]
【発明が解決しようとする課題】しかし、定着開始前の
熱ローラの温度分布に差異、即ち、端部の温度が高い場
合、略均一な場合、中央部が高い場合、で非通紙部昇温
対策をとっているにもかかわらず、非通紙部が昇温した
り、逆に温度不足で定着不良を生じることがある。However, there is a difference in the temperature distribution of the heat roller before the start of fixing, that is, when the temperature of the end portion is high, when the temperature is substantially uniform, and when the central portion is high, the non-sheet passing portion rises. Despite taking measures against temperature, the non-sheet passing portion may be heated, or conversely, insufficient temperature may cause fixing failure.
【０００８】また、１枚目の定着の際の定着温度を高く
すると、１枚ずつの定着を繰り返し行なうと定着温度は
高いままであるため、熱量が多すぎ高温オフセットが生
じたり、非通紙部昇温の解消が遅れたり、もしくは悪化
したりする。If the fixing temperature at the time of fixing the first sheet is increased, the fixing temperature remains high when the fixing is repeated one sheet at a time, so that the amount of heat is too large and a high temperature offset occurs, or non-sheet passing. The elimination of part temperature rise is delayed or worse.
【０００９】そこで、ウェイト解除後の初期時のみに定
着温度を高くする構成とすると、長期放置後は定着不良
が生じ易い。Therefore, if the fixing temperature is increased only at the initial stage after the weight is released, the fixing failure is likely to occur after a long period of standing.
【００１０】[0010]
【課題を解決するための手段】上記課題を解決する本発
明は、ヒータにより加熱される加熱体と、この加熱体と
ニップを形成する加圧部材と、を有し、ニップで未定着
画像を支持した記録材を挟持搬送して定着を行なう定着
装置において、記録材のサイズと定着回数を記憶する記
憶手段と、この記憶手段により記憶された前回の記録材
のサイズ及び定着回数と今回の記録材のサイズに基づき
定着条件を設定する定着条件設定手段と、を有するもの
である。SUMMARY OF THE INVENTION The present invention for solving the above problems includes a heating body heated by a heater and a pressure member forming a nip with the heating body, and an unfixed image is formed in the nip. In a fixing device that carries and fixes a supported recording material by sandwiching it, a storage unit that stores the size and the number of fixings of the recording material, the size of the previous recording material and the number of fixings that are stored by the storage unit, and the present recording And a fixing condition setting means for setting the fixing condition based on the size of the material.
【００１１】[0011]
（第１実施例）以下、本発明の実施例を図面に基づき説
明する。(First Embodiment) An embodiment of the present invention will be described below with reference to the drawings.
【００１２】図１は本発明の実施例の定着装置を用いた
画像形成装置の断面図である。FIG. 1 is a sectional view of an image forming apparatus using a fixing device according to an embodiment of the present invention.
【００１３】感光体ドラム１は帯電器２によって均一に
帯電された後、像露光３を受け静電潜像が形成される。The photosensitive drum 1 is uniformly charged by the charger 2 and then subjected to image exposure 3 to form an electrostatic latent image.
【００１４】この静電潜像は現像器４で粉体トナーで現
像される。This electrostatic latent image is developed with powder toner in the developing device 4.
【００１５】感光体上のトナー像は転写帯電器５により
記録材に転写される。The toner image on the photoconductor is transferred onto the recording material by the transfer charger 5.
【００１６】トナー像が転写された記録材は分離除電器
６により感光体から分離された後、定着装置９で定着さ
れる。The recording material on which the toner image has been transferred is separated from the photoconductor by the separation charge eliminator 6 and then fixed by the fixing device 9.
【００１７】１０は記録材Ｐを収容するカセットで、こ
のカセット１０には記録材のサイズを識別する識別ボタ
ン１１が設けられている。Reference numeral 10 denotes a cassette for accommodating the recording material P. The cassette 10 is provided with an identification button 11 for identifying the size of the recording material.
【００１８】この識別ボタン１１は記録材サイズ検出セ
ンサ１２により検出され、この検出された記録材サイズ
は制御回路１３に送られる。The identification button 11 is detected by the recording material size detection sensor 12, and the detected recording material size is sent to the control circuit 13.
【００１９】また、この制御回路１３は連続定着回数の
カウントも行なっている。The control circuit 13 also counts the number of continuous fixings.
【００２０】図２は本実施例の定着装置の拡大断面図で
ある。FIG. 2 is an enlarged sectional view of the fixing device of this embodiment.
【００２１】未定着トナー像を担持した記録材Ｐは入口
ガイド１４に案内されて定着ローラ１５と加圧ローラ１
６間のニップに導かれ、このニップで熱と圧力とにより
定着される。The recording material P carrying the unfixed toner image is guided by the entrance guide 14 and the fixing roller 15 and the pressure roller 1
It is guided to the nip between 6 and is fixed by heat and pressure in this nip.
【００２２】定着ローラ１５は厚さ０．７ｍｍの炭素鋼
製の芯金１７と、この芯金１７上に被覆されたフッ素樹
脂からなる離型層１８からなる。The fixing roller 15 comprises a core bar 17 made of carbon steel having a thickness of 0.7 mm, and a release layer 18 made of fluororesin and coated on the core bar 17.
【００２３】定着ローラ１５内部には配光分布の異なる
２本のハロゲンヒータ１９，２０が挿入されている。Inside the fixing roller 15, two halogen heaters 19 and 20 having different light distributions are inserted.
【００２４】加圧ローラ１６は芯金２１上にシリコンス
ポンジゴム層２２を設け、更にこのシリコンスポンジゴ
ム層２２上にＰＦＡ等のフッ素樹脂からなる離型層２３
が被覆されている。In the pressure roller 16, a silicon sponge rubber layer 22 is provided on a core metal 21, and a release layer 23 made of fluororesin such as PFA is further provided on the silicon sponge rubber layer 22.
Are covered.
【００２５】２４は定着ローラ１５の表面温度を検知す
る温度検知センサで、この検知信号は制御回路１３に入
力され、ヒータ１９，２０のオン、オフのタイミングを
制御する。Reference numeral 24 denotes a temperature detection sensor for detecting the surface temperature of the fixing roller 15. This detection signal is input to the control circuit 13 to control the on / off timing of the heaters 19 and 20.
【００２６】炭素鋼は強度は充分得られるが、熱容量が
同量のアルミニウムより小さく、特に熱伝導性がアルミ
ニウムに比べ著しく劣る。そのため、定着能力はアルミ
ニウムの定着ローラーに比べ劣り、非通紙部昇温もアル
ミニウムローラーより悪くなる傾向にある。しかし、定
着ローラーを薄くすることで、ウェイトタイムを短縮す
るため、加圧ローラーによる圧力による変形を防ぐため
にはアルミニウムのローラーでは強度が足らず炭素鋼が
非常に有利である。Although carbon steel has a sufficient strength, it has a heat capacity smaller than that of aluminum having the same amount, and in particular, its thermal conductivity is significantly inferior to that of aluminum. Therefore, the fixing ability is inferior to that of the aluminum fixing roller, and the temperature rise in the non-sheet passing portion tends to be worse than that of the aluminum roller. However, by thinning the fixing roller, the wait time is shortened. Therefore, in order to prevent the deformation due to the pressure of the pressure roller, the aluminum roller is insufficient in strength and carbon steel is very advantageous.
【００２７】次にハロゲンヒータ１９，２０の配光分布
について説明する。Next, the light distribution of the halogen heaters 19 and 20 will be described.
【００２８】図３はメインヒータ１９の配光分布、図４
はサブヒータ２０の配光分布を示す。FIG. 3 shows the light distribution of the main heater 19, FIG.
Shows the light distribution of the sub-heater 20.
【００２９】メインヒータは７００Ｗで小サイズ紙を大
量に通紙した場合でも非通紙部昇温が抑えられるように
中央部を強めた配光分布を持たせ、サブヒータはメイン
ヒータでは最大通紙巾の紙は端部が定着しなくなるの
で、端部の配光を強めた６００Ｗのヒータを使用した。The main heater has a light distribution in which the central portion is strengthened so that the temperature rise of the non-sheet passing portion can be suppressed even when a large amount of small size paper is passed at 700 W, and the sub heater has the maximum sheet passing width in the main heater. Since the paper does not fix at the edges, a 600 W heater with enhanced light distribution at the edges was used.
【００３０】小サイズ紙を定着する場合、サブヒータを
オフし、メインヒータのみを点灯させる。When fixing small size paper, the sub heater is turned off and only the main heater is turned on.
【００３１】大サイズ紙を定着する場合は、２本のヒー
タを交互に発光させ、その発光間隔比率を制御する方法
をとる。図５〜図７によってこの制御を説明する。制御
装置はメインヒータ、サブヒータそれぞれをＯＮ／ＯＦ
Ｆする機構を備え、従来１本のヒータの点滅によって温
度制御を行うところ（図５）をメインヒータをＴ１秒、
サブヒータをＴ２秒交互に点灯させることによって最大
通紙巾の紙も良好に定着させることが出来るように設定
している（図６）。また、発光比率を可変にし、例え
ば、前記の例よりメインヒータはＴ１−ｔ秒、サブヒー
タをＴ２＋ｔ秒交互に点灯することに変更することで違
うサイズ、例えば、Ｂ４等を良好に定着させることが可
能となる。When fixing a large size sheet, two heaters are caused to emit light alternately and the emission interval ratio is controlled. This control will be described with reference to FIGS. The controller turns on / off each of the main heater and sub heater.
The conventional heater is equipped with a mechanism for controlling the temperature and the temperature is controlled by blinking one heater (Fig. 5).
The sub-heater is alternately turned on for T2 seconds so that the paper having the maximum paper passing width can be fixed well (FIG. 6). Further, by changing the light emission ratio, for example, by alternately turning on the main heater for T1-t seconds and the sub-heater for T2 + t seconds according to the above example, it is possible to satisfactorily fix a different size, for example, B4. It will be possible.
【００３２】この定着器を３０ｃｐｍの図１の複写機に
組み込み通紙実験を行った。温調温度は通常１９０℃で
行いＡ４の横巾以下の巾の紙（小サイズ紙）を通紙する
場合は６０枚以上通紙したときに温調温度を１０℃落す
制御を行う。最大通紙巾はＡ３の横巾で、Ａ４の横巾以
上の巾の紙を通紙する場合はメインヒータとサブヒータ
の発光間隔Ｔ１：Ｔ２を４：１にしておき、メインヒー
タの端部の熱量の足りない分をサブヒータによって保証
する。This fixing device was incorporated into a 30 cpm copying machine shown in FIG. 1 and a paper passing experiment was conducted. The temperature control temperature is usually 190 ° C. When passing a width of A4 or less (small size paper), the temperature control temperature is lowered by 10 ° C. when 60 sheets or more are passed. The maximum paper width is A3 width, and when paper with a width larger than A4 width is used, the emission interval T1: T2 between the main heater and sub-heater is set to 4: 1 and the heat quantity at the end of the main heater is set. Guarantee the lacking amount by the sub heater.
【００３３】それぞれの紙サイズ、通紙枚数によるＯＮ
／ＯＦＦタイミング構成は下記表１の様に設定した。ON depending on each paper size and number of sheets passed
The / OFF timing configuration is set as shown in Table 1 below.
【００３４】[0034]
【表１】 [Table 1]
【００３５】ここで複写動作終了後１分間は前回の複写
時の定着条件を制御回路１３内のメモリーに記憶してい
る。Here, the fixing condition at the time of the previous copying is stored in the memory in the control circuit 13 for one minute after the completion of the copying operation.
【００３６】本実施例においては複写動作終了後１分以
内に次の複写動作を開始した場合に、温調以外に２本の
ヒータの発光間隔比率も前回の定着動作を継続して変更
する。これは、例えば、Ａ４Ｒを大量に通紙し、非通紙
部昇温がひどくなった場合にＢ４Ｒを通紙し、サブヒー
タも発光させると、端部昇温が平常状態に戻りにくくな
る。よって、Ａ４Ｒを適当な枚数通紙した後にＢ４Ｒを
通紙した場合は最初メインヒータのみで定着させる様に
設定する。端部昇温しているためメインヒータのみでも
初期は十分定着する。In the present embodiment, when the next copying operation is started within 1 minute after the completion of the copying operation, the light emission interval ratio of the two heaters is also changed in addition to the temperature adjustment in the previous fixing operation. This is because, for example, if a large amount of A4R is passed, B4R is passed when the temperature rise in the non-sheet passing portion is severe, and the sub-heater is also made to emit light, it is difficult for the edge temperature rise to return to the normal state. Therefore, when B4R is passed after passing an appropriate number of A4R sheets, it is set so that only the main heater is used for fixing. Since the temperature is rising at the edges, the main heater alone is sufficient for initial fixing.
【００３７】複写動作終了から１分が経過するとメモリ
ー内の前回の紙巾及び回数はリセットされ、新たな複写
時は今回の紙サイズと通紙枚数により定着条件が設定さ
れる。When one minute has passed from the end of the copying operation, the previous paper width and the number of times in the memory are reset, and at the time of a new copying, the fixing condition is set by the current paper size and the number of passed sheets.
【００３８】本実施例の複写終了後１分以内に次の複写
を開始した場合の定着条件の設定を下記表２に示す。Table 2 below shows the setting of the fixing conditions when the next copying is started within 1 minute after the completion of copying in this embodiment.
【００３９】[0039]
【表２】 表２の縦の列は前回の複写動作の紙サイズと通紙枚数を
示す。表２の横の列は複写動作終了後１分の間に開始し
た場合の紙サイズを示す。表中枚数加算は前回の通紙枚
数に加算して通紙枚数を計数することを示す。[Table 2] The vertical columns of Table 2 show the paper size and the number of passed sheets in the previous copying operation. The horizontal row of Table 2 shows the paper size when the copying operation is started within 1 minute after the end. The addition of the number of sheets in the table indicates that the number of sheets passed is counted in addition to the number of sheets passed previously.
【００４０】例えば、Ａ４Ｒを８０枚通紙した後１分以
内にＢ４Ｒを２０枚通紙する。１回目の通紙により温調
は１８０℃になっている。２回目の通紙においては図中
Ａ４Ｒ、６０〜１４０の行を見、Ｂ４Ｒの列と交わると
ころの制御を行うから、温調温度は１８０℃で、８１枚
より計数をはじめ、Ｂ４Ｒ、１０枚通紙するまではメイ
ンヒータのみで温調する。１１枚以降はメイン：サブの
比率は８：１で温調する。For example, after passing 80 sheets of A4R, 20 sheets of B4R are passed within 1 minute. The temperature is 180 ° C due to the first pass. In the second pass, the line A4R, 60 to 140 in the figure is seen, and the control is performed at the intersection with the column B4R. Therefore, the temperature control temperature is 180 ° C, counting from 81 sheets, B4R, 10 sheets. Only the main heater controls the temperature until the paper passes. After the 11th sheet, the temperature is adjusted at a main: sub ratio of 8: 1.
【００４１】上記の２つの表を記憶させてＬＵＴ（Ｌｏ
ｏｋ ｕｐ Ｔａｂｌｅ）とし、複写終了後１分以内に
新たに複写を行う場合はこの表を参照して温調温度を決
定する。The above two tables are stored and stored in the LUT (Lo
ok up Table), if a new copy is to be made within 1 minute after the end of copying, the temperature control temperature is determined by referring to this table.
【００４２】図８に本実施例の動作を示す。FIG. 8 shows the operation of this embodiment.
【００４３】この本実施例によれば、あらゆる条件下
で、非通紙部昇温及び定着不良を防止できる。According to this embodiment, it is possible to prevent the temperature rise in the non-sheet passing portion and the fixing failure under all conditions.
【００４４】（第２実施例）本実施例においては定着条
件に加えて通紙速度、もしくは複写動作前の前回転の時
間を制御する機構を備える。もちろん両者を兼ね備えて
もよい。(Second Embodiment) In this embodiment, in addition to the fixing condition, a mechanism is provided for controlling the sheet passing speed or the pre-rotation time before the copying operation. Of course, you may have both.
【００４５】小サイズ紙を大量に通紙し、端部昇温がひ
どくなっている状態で一定時間内に小サイズ紙を通紙す
る場合は前回転時間を通常より延長し端部の温度が充分
低くなってから次の通紙を行う。もしくは、次の複写動
作の初期のみは通紙速度を落すか、通紙間隔を延ばすこ
とで端部昇温を抑えることが可能となる。When a large amount of small size paper is passed and the temperature rise at the edge is severe and the small size paper is passed within a certain time, the pre-rotation time is extended as compared to the normal time and the temperature of the edge is increased. Wait until it is sufficiently low to pass the next sheet. Alternatively, only at the initial stage of the next copying operation, it is possible to suppress the temperature rise at the end portion by decreasing the sheet passing speed or extending the sheet passing interval.
【００４６】本実施例の設定を下表３に示す。The settings of this embodiment are shown in Table 3 below.
【００４７】[0047]
【表３】 [Table 3]
【００４８】表中Ａ４Ｒは前回の通紙紙サイズ、数字は
前回の通紙枚数で、２回目の通紙もＡ４Ｒの場合。もち
ろん、複写動作終了後一定時間後はこの制御を行わな
い。In the table, A4R is the size of the previous sheet, the number is the number of sheets of the previous sheet, and the second sheet is also A4R. Of course, this control is not performed after a fixed time has elapsed after the copying operation is completed.
【００４９】（第３実施例）本実施例では定着開始１枚
目の定着性を確保するために１枚目の定着に対応して複
写開始信号から一定期間、例えば１枚目の記録材が定着
器を通過するまで上昇させた後に通常の定着温度に戻
す、所謂強制点灯を行なっている。(Third Embodiment) In this embodiment, in order to secure the fixability of the first sheet of fixing start, the first sheet of recording material is kept for a certain period from the copy start signal in correspondence with the first sheet of fixing. The so-called forced lighting is performed in which the temperature is raised until it passes through the fixing device and then returned to the normal fixing temperature.
【００５０】図９は本実施例のブロック図である。FIG. 9 is a block diagram of this embodiment.
【００５１】図１０、図１１に定着ローラの温度変化を
示す。10 and 11 show the temperature change of the fixing roller.
【００５２】図１の３０ｃｐｍの複写機に搭載し通紙実
験を行った。強制点灯としては複写開始と共に通常１９
０度温調のところを２０５℃温調で制御させ、最初の１
枚目が定着器を通過するまで行う。その後はまた１９０
℃温調で制御する。A paper passing experiment was carried out by mounting the copying machine on the 30 cpm copying machine shown in FIG. As for forced lighting, it is usually 19 when copying starts.
The 0 degree temperature control is controlled by 205 ° C temperature control, and the first 1
Repeat until the first sheet passes the fixing device. Then again 190
Control by ℃ temperature control.
【００５３】従来の制御の定着器では１枚ずつ１秒間隔
で複写を行ったところ、定着ローラーの表面温度は２０
５℃で推移したが、一時的に最大２２０℃にまでなり安
全装置が作動してしまった。When copying was performed one sheet at a time at 1 second intervals with the conventional control fixing device, the surface temperature of the fixing roller was 20.
It remained at 5 ° C, but temporarily reached a maximum of 220 ° C and the safety device was activated.
【００５４】この複写機に、複写終了後１分間に新たな
複写が行われたとき、強制点灯は行わない制御を行う。
この定着器で同様に１枚ずつ１秒間隔で複写を行ったと
ころ１９０℃で推移し、一時的にも最大２００℃で問題
はなかった。定着性に関しても問題はなかった。In this copying machine, when a new copy is made within 1 minute after the copy is completed, control is performed such that forced lighting is not performed.
When copying was performed one sheet at a time at 1 second intervals in the same manner with this fixing device, the temperature remained at 190 ° C., and temporarily there was no problem at a maximum of 200 ° C. There was no problem with the fixability.
【００５５】（第４実施例）図１２に本実施例のブロッ
ク図を示す。本実施例においては装置の構成が前述実施
例と同じなため詳細は略す。(Fourth Embodiment) FIG. 12 shows a block diagram of the present embodiment. In this embodiment, the structure of the apparatus is the same as that of the above-mentioned embodiment, and therefore its details are omitted.
【００５６】本実施例においても配光分布のことなる２
本のハロゲンヒータを熱源として使用している。２本の
ハロゲンヒータの配光及びワッテージは第１実施例と同
じである。In this embodiment also, the light distribution is different.
The halogen heater of the book is used as a heat source. The light distribution and wattage of the two halogen heaters are the same as in the first embodiment.
【００５７】コピー終了と共に時間を計測し、１分以内
に新たなコピーを開始しないと計測を終了し、その後、
コピーを行うと通常のコピーを行う。When the copy is completed, the time is measured, and if a new copy is not started within 1 minute, the measurement is completed, and thereafter,
When you make a copy, a normal copy is made.
【００５８】１分以内に新たにコピーを行うと、まず、
前回のコピーで通紙された枚数を判断する。これは、前
回のコピーで大量に通紙した場合には温度分布の不均一
が発生しているからで本実施例においては４０枚を基準
に考え４０枚以下ならば前回のコピーにおいて不均一な
温度分布が発生しなかったと判断する。When a new copy is made within 1 minute, first,
Determine the number of sheets passed in the previous copy. This is because the temperature distribution becomes non-uniform when a large amount of paper is passed in the previous copy. In the present embodiment, if 40 sheets or less is considered as the reference, non-uniformity is obtained in the previous copy. It is determined that the temperature distribution did not occur.
【００５９】この場合は、前回のコピーにおける条件を
無視し、今回のコピーにおいて通紙される紙サイズによ
り強制点灯で使用するハロゲンヒータを決定する。In this case, the conditions for the previous copy are ignored, and the halogen heater to be used for forced lighting is determined according to the size of the paper passed in this copy.
【００６０】つまり、今回通紙される紙サイズが最大通
紙巾（大サイズ）ならばサブヒータのみによって強制点
灯を行い、大サイズ紙の通紙によって起こる端部温度の
低下を保証する。今回通紙される紙サイズが最大通紙巾
より狭い紙（小サイズ紙）の場合は非通紙部昇温を軽減
するためにメインヒータのみで強制点灯を行う。両者の
場合でも強制点灯の後はそのサイズに適応したヒータの
発光間隔比率で定着を行う。もちろん、大サイズ、小サ
イズの２つの区別だけでなく各種の紙サイズに応じてヒ
ータの発光間隔比率を変えて強制点灯を行うことができ
る。また、ヒータも２本限る必要もない。That is, if the paper size to be passed this time is the maximum paper width (large size), forced lighting is performed only by the sub-heater, and the lowering of the end temperature caused by the passing of the large size paper is guaranteed. If the size of the paper to be passed this time is narrower than the maximum paper width (small size paper), the main heater is used to forcibly turn on the light to reduce the temperature rise in the non-paper passing area. In both cases, after the forced lighting, fixing is performed at the heater light emission interval ratio adapted to the size. Of course, not only the large size and the small size can be distinguished, but also the lighting interval ratio of the heater can be changed according to various paper sizes to perform forced lighting. Also, it is not necessary to limit the number of heaters to two.
【００６１】前回のコピー枚数が４０枚より多い場合
は、前回のコピーの紙サイズに応じて紙が定着器に突入
するまでの強制点灯で使用するヒータを決定する。If the number of copies made last time is more than 40, the heater to be used is determined according to the paper size of the previous copy until the paper rushes into the fixing device.
【００６２】前回の紙サイズが大サイズならば端部の温
度が低下しているためにサブヒータのみで強制点灯を行
い、前回のコピーの紙が小サイズならば、非通紙部昇温
を軽減するためにメインヒータによって強制点灯を行
う。そのご、今回のコピーの紙サイズによって、紙が定
着器に突入してから排出されるまでの強制点灯で使用す
るヒータを決定する。今回通紙される紙サイズが大サイ
ズならばサブヒータのみによって強制点灯を行い、大サ
イズ紙の通紙によって起こる端部温度の低下を保証す
る。今回通紙されるサイズが小サイズ紙の場合は非通紙
部昇温を軽減するためにメインヒータのみで強制点灯を
行う。この場合でも強制点灯の後はそのサイズに適応し
たヒータの発光間隔比率で定着を行う。本実施例におい
ては定着器に紙が突入するときで強制点灯の方法を切り
替えたが、これはその装置によって個別に設定される。
もちろんヒータの発光間隔比率を連続的に変化させるこ
とで対応することもできる。If the size of the previous paper is large, the temperature of the edge is lowered, so the sub heater is forcibly turned on, and if the paper of the previous copy is small, the temperature rise in the non-sheet passing area is reduced. In order to do so, forced lighting is performed by the main heater. In each case, the heater to be used is determined by the compulsory lighting from the time when the paper enters the fixing device to the time when the paper is ejected, depending on the paper size of this copy. If the size of the paper to be passed this time is large, the sub-heater alone is used to forcibly turn on the light to ensure that the temperature at the end of the large paper is reduced. If the size of the paper to be passed this time is small, the main heater is used to forcibly turn on the light in order to reduce the temperature rise in the non-paper passing area. Even in this case, after the forced lighting, the fixing is performed at the light emission interval ratio of the heater adapted to the size. In the present embodiment, the method of forced lighting is switched when the paper enters the fixing device, but this is set individually by the device.
Of course, it is also possible to deal with this by continuously changing the light emission interval ratio of the heater.
【００６３】本実施例によると前回と今回の紙サイズ、
枚数によらず良好な定着が行えた。According to this embodiment, the previous and current paper sizes,
Good fixing was possible regardless of the number of sheets.
【００６４】（第５実施例）本実施例を示すブロック図
を図１３に示す。本実施例においても第１実施例に使用
した、メインヒータ、サブヒータの配光間隔比率可変の
制御を行う複写機を使用している。(Fifth Embodiment) FIG. 13 is a block diagram showing this embodiment. In this embodiment as well, the copying machine which is used in the first embodiment and controls the light distribution interval ratio of the main heater and the sub-heater is used.
【００６５】本実施例においてはコピーボタンが押され
たとき、複写される紙サイズによってメインヒータとサ
ブヒータのいずれかによる強制点灯を決定する。In the present embodiment, when the copy button is pressed, forced lighting by either the main heater or the sub heater is determined according to the size of the paper to be copied.
【００６６】複写される紙サイズが大サイズならば端部
の放熱による温度の低下を保証するためサブヒータによ
って強制点灯を行う。また、複写される紙サイズが小サ
イズならば、端部昇温を軽減するためにメインヒータに
よって強制点灯を行う。もちろん、ここでも紙サイズを
２種類のみならず多数種類に分類してそれぞれに最適な
温度分布を持つようにヒータ発光間隔比率を可変するこ
とが可能であり、ヒータの数も２本に限るものではな
い。If the size of the paper to be copied is large, the sub-heater forcibly turns on the light in order to guarantee the temperature drop due to the heat radiation at the end. If the size of the paper to be copied is small, the main heater turns on forcibly to reduce the temperature rise at the edges. Of course, here as well, it is possible to classify the paper size into not only two types but also many types, and change the heater emission interval ratio so as to have an optimum temperature distribution for each, and the number of heaters is also limited to two. is not.
【００６７】強制点灯が終了した後の通紙においてはそ
れぞれの紙サイズに最適のヒータ発光間隔比率によって
定着を行う。In the sheet passing after the forced lighting is completed, the fixing is performed by the heater emission interval ratio which is optimum for each sheet size.
【００６８】本実施例においても良好な定着性が得ら
れ、長期放置後にコピーを行っても初期より良好な定着
性を示し、紙サイズによってヒータを選択しているので
効率のよい強制点灯を行うことが可能となった。In this embodiment as well, good fixability is obtained, and even after copying for a long period of time, good fixability is exhibited from the beginning, and since the heater is selected according to the paper size, efficient forced lighting is performed. It has become possible.
【００６９】[0069]
【発明の効果】このように本発明によれば定着前の加熱
体の温度状態にかかわらず、非通紙部昇温や定着不良を
発生することなく、定着動作を行なうことができる。As described above, according to the present invention, the fixing operation can be performed regardless of the temperature state of the heating element before fixing without causing a temperature rise in the non-sheet passing portion or a fixing failure.
【図１】本発明の実施例の定着装置を用いた画像形成装
置の断面図である。FIG. 1 is a cross-sectional view of an image forming apparatus using a fixing device according to an exemplary embodiment of the present invention.
【図２】本発明の実施例の定着装置の拡大断面図であ
る。FIG. 2 is an enlarged cross-sectional view of the fixing device according to the exemplary embodiment of the present invention.
【図３】メインヒータの配光分布を示す図である。FIG. 3 is a diagram showing a light distribution of a main heater.
【図４】サブヒータの配光分布を示す図である。FIG. 4 is a diagram showing a light distribution of a sub heater.
【図５】１本のヒータを用いる場合のオンオフタイミン
グを示す図である。FIG. 5 is a diagram showing on / off timings when one heater is used.
【図６】本発明の実施例のヒータのオンオフタイミング
を示す図である。FIG. 6 is a diagram showing ON / OFF timing of the heater according to the embodiment of the present invention.
【図７】本発明の実施例のヒータのオンオフタイミング
を示す図である。FIG. 7 is a diagram showing on / off timings of the heater according to the embodiment of the present invention.
【図８】本発明の実施例のブロック図である。FIG. 8 is a block diagram of an embodiment of the present invention.
【図９】本発明の実施例のブロック図である。FIG. 9 is a block diagram of an embodiment of the present invention.
【図１０】本発明の実施例の定着ローラの温度変化を示
す図である。FIG. 10 is a diagram showing a temperature change of the fixing roller according to the embodiment of the invention.
【図１１】本発明の実施例の定着ローラの温度変化を示
す図である。FIG. 11 is a diagram showing a temperature change of the fixing roller according to the embodiment of the invention.
【図１２】本発明の実施例のブロック図である。FIG. 12 is a block diagram of an embodiment of the present invention.
【図１３】本発明の実施例のブロック図である。FIG. 13 is a block diagram of an embodiment of the present invention.
１５ 定着ローラ １６ 加圧ローラ １９ メインヒータ ２０ サブヒータ ２４ サーミスタ 15 fixing roller 16 pressure roller 19 main heater 20 sub-heater 24 thermistor
Claims (4)
加熱体とニップを形成する加圧部材と、を有し、ニップ
で未定着画像を支持した記録材を挟持搬送して定着を行
なう定着装置において、 記録材のサイズと定着回数を記憶する記憶手段と、この
記憶手段により記憶された前回の記録材のサイズ及び定
着回数と今回の記録材のサイズに基づき定着条件を設定
する定着条件設定手段と、を有することを特徴とする定
着装置。1. A fixing device comprising a heating member heated by a heater and a pressure member forming a nip with the heating member, and nipping and transporting a recording material supporting an unfixed image at the nip for fixing. In the apparatus, a storage unit that stores the size of the recording material and the number of fixings, and a fixing condition setting that sets the fixing condition based on the size of the previous recording material and the number of fixings and the size of the present recording stored by the storage unit. And a fixing unit.
着温度に維持する温調手段を有し、上記定着条件設定手
段は定着温度を設定することを特徴とする請求項１の定
着装置。2. The fixing device according to claim 1, further comprising temperature adjusting means for maintaining the heating body at a predetermined fixing temperature, and the fixing condition setting means sets the fixing temperature. .
するタイマーを有し、定着終了後所定時間経過後は、上
記定着条件設定手段は前回の記録材のサイズ及び定着回
数には関係なく定着条件を設定することを特徴とする請
求項１もしくは２の定着装置。3. The apparatus further comprises a timer for measuring the time after completion of fixing, and after a lapse of a predetermined time after completion of fixing, the fixing condition setting means is irrespective of the size of the previous recording material and the number of times of fixing. The fixing device according to claim 1, wherein fixing conditions are set.
第２のヒータを有し、上記定着条件設定手段は第１及び
第２のヒータへの通電条件を設定することを特徴とする
請求項１もしくは３の定着装置。4. The heating element has first and second heaters having different light distributions, and the fixing condition setting means sets an energization condition for the first and second heaters. The fixing device according to claim 1.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4179894A JP2974507B2 (en) | 1992-07-07 | 1992-07-07 | Image forming device |
| DE69332233T DE69332233T2 (en) | 1992-03-31 | 1993-03-29 | Image heater with control of the actuation of several heating elements |
| EP93830125A EP0564420B1 (en) | 1992-03-31 | 1993-03-29 | Image heating device capable of controlling activation of plural heaters |
| US08/331,873 US5512993A (en) | 1992-03-31 | 1994-11-01 | Image heating device capable of controlling activation of plural heaters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4179894A JP2974507B2 (en) | 1992-07-07 | 1992-07-07 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0627855A true JPH0627855A (en) | 1994-02-04 |
| JP2974507B2 JP2974507B2 (en) | 1999-11-10 |
Family
ID=16073766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4179894A Expired - Fee Related JP2974507B2 (en) | 1992-03-31 | 1992-07-07 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2974507B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0915394A2 (en) * | 1997-11-07 | 1999-05-12 | Canon Kabushiki Kaisha | Image fixing apparatus |
| WO2000055696A1 (en) * | 1999-03-18 | 2000-09-21 | Canon Kabushiki Kaisha | Image forming device |
| JP2001272897A (en) * | 2000-03-09 | 2001-10-05 | Toshiba Tec Corp | Apparatus and method for forming image |
| US6552304B1 (en) | 1998-05-20 | 2003-04-22 | Fujitsu Limited | Temperature control method and system for thermal fixing unit, and image forming apparatus |
| JP2011013329A (en) * | 2009-06-30 | 2011-01-20 | Canon Inc | Image forming apparatus |
| JP2013235189A (en) * | 2012-05-10 | 2013-11-21 | Canon Inc | Image forming apparatus |
| JP2014178635A (en) * | 2013-03-15 | 2014-09-25 | Ricoh Co Ltd | Fixing device, and image forming apparatus |
| JP2017187519A (en) * | 2016-04-01 | 2017-10-12 | キヤノンファインテックニスカ株式会社 | Fixing device and image formation device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02146074A (en) * | 1988-03-28 | 1990-06-05 | Xerox Corp | Fixing device control system |
| JPH02239273A (en) * | 1989-03-14 | 1990-09-21 | Canon Inc | Device for heating and pressurizing sheet material while carrying it |
| JPH02254481A (en) * | 1989-03-29 | 1990-10-15 | Ricoh Co Ltd | Fixing temperature controlling method |
| JPH02271378A (en) * | 1989-04-12 | 1990-11-06 | Canon Inc | Image forming device |
-
1992
- 1992-07-07 JP JP4179894A patent/JP2974507B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02146074A (en) * | 1988-03-28 | 1990-06-05 | Xerox Corp | Fixing device control system |
| JPH02239273A (en) * | 1989-03-14 | 1990-09-21 | Canon Inc | Device for heating and pressurizing sheet material while carrying it |
| JPH02254481A (en) * | 1989-03-29 | 1990-10-15 | Ricoh Co Ltd | Fixing temperature controlling method |
| JPH02271378A (en) * | 1989-04-12 | 1990-11-06 | Canon Inc | Image forming device |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0915394A2 (en) * | 1997-11-07 | 1999-05-12 | Canon Kabushiki Kaisha | Image fixing apparatus |
| EP0915394A3 (en) * | 1997-11-07 | 1999-12-15 | Canon Kabushiki Kaisha | Image fixing apparatus |
| US6115563A (en) * | 1997-11-07 | 2000-09-05 | Canon Kabushiki Kaisha | Image fixing apparatus |
| US6552304B1 (en) | 1998-05-20 | 2003-04-22 | Fujitsu Limited | Temperature control method and system for thermal fixing unit, and image forming apparatus |
| WO2000055696A1 (en) * | 1999-03-18 | 2000-09-21 | Canon Kabushiki Kaisha | Image forming device |
| US6785484B2 (en) * | 1999-03-18 | 2004-08-31 | Canon Kabushiki Kaisha | Image forming apparatus using copy speed to control fixing temperature |
| JP2001272897A (en) * | 2000-03-09 | 2001-10-05 | Toshiba Tec Corp | Apparatus and method for forming image |
| JP2011013329A (en) * | 2009-06-30 | 2011-01-20 | Canon Inc | Image forming apparatus |
| JP2013235189A (en) * | 2012-05-10 | 2013-11-21 | Canon Inc | Image forming apparatus |
| JP2014178635A (en) * | 2013-03-15 | 2014-09-25 | Ricoh Co Ltd | Fixing device, and image forming apparatus |
| JP2017187519A (en) * | 2016-04-01 | 2017-10-12 | キヤノンファインテックニスカ株式会社 | Fixing device and image formation device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2974507B2 (en) | 1999-11-10 |
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