JP3437202B2 - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JP3437202B2 JP3437202B2 JP31127392A JP31127392A JP3437202B2 JP 3437202 B2 JP3437202 B2 JP 3437202B2 JP 31127392 A JP31127392 A JP 31127392A JP 31127392 A JP31127392 A JP 31127392A JP 3437202 B2 JP3437202 B2 JP 3437202B2
- Authority
- JP
- Japan
- Prior art keywords
- recording material
- temperature
- size
- heating roller
- paper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Fixing For Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、転写材に担持されたト
ナーを加熱加圧することによって転写材に定着する定着
装置並びにこのような定着装置を備えた画像形成装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for fixing toner on a transfer material by heating and pressing the toner carried on the transfer material, and an image forming apparatus equipped with such a fixing device.
【０００２】[0002]
【従来の技術】従来、画像形成装置に用いられる定着装
置として、熱効率、安全性が良好な接触加熱型の定着装
置、特に一対のローラで形成される熱ローラ型の定着装
置が広く用いられている。2. Description of the Related Art Conventionally, as a fixing device used in an image forming apparatus, a contact heating type fixing device having good thermal efficiency and safety, particularly a heat roller type fixing device formed by a pair of rollers has been widely used. There is.
【０００３】このものは、一対のローラとして、円筒状
のローラで内側にヒータが配設された加熱ローラと、こ
の加熱ローラに圧接されて加熱ローラとの間にニップ部
を形成する加圧ローラとを備えている。ヒータで加熱ロ
ーラを加熱し、ニップ部に、未定着のトナーを担持した
転写材を通過させることによって、トナーを加熱加圧し
て転写材上に定着する。This is, as a pair of rollers, a heating roller having a heater inside which is a cylindrical roller, and a pressure roller forming a nip between the heating roller and the heating roller. It has and. The heating roller is heated by the heater, and the transfer material carrying the unfixed toner is passed through the nip portion to heat and pressurize the toner to fix it on the transfer material.
【０００４】トナーを担持する転写材は、いろいろのサ
イズのものが使用される。したがって、これら転写材の
搬送方向に直角な方向の左右幅、すなわち、これらの転
写材がニップ部を通過するときの幅（以下「通紙幅」と
いう）についても種々のものがある。そこで、加熱ロー
ラ及び加圧ローラの外周面について、それぞれ通紙幅
で、外周面をグルリと一周したときの領域を通紙領域と
し、通紙領域以外の領域を非通紙領域とすると、加熱ロ
ーラ及び加圧ローラの軸方向の幅（ニップ部の長さにほ
ぼ等しい）が、通紙幅が最大の転写材に合わせて設定さ
れているため、通紙幅が小さい転写材をニップ部に通過
させると、非通紙領域が大きくなるようになっている。As the transfer material carrying the toner, those having various sizes are used. Therefore, there are various left and right widths of these transfer materials in a direction perpendicular to the transport direction, that is, widths when these transfer materials pass through the nip portion (hereinafter referred to as "paper passing width"). Therefore, regarding the outer peripheral surfaces of the heating roller and the pressure roller, if the area when the outer peripheral surface makes one round with the paper passing width is the paper passing area and the area other than the paper passing area is the non-paper passing area, the heating roller Also, since the axial width of the pressure roller (approximately equal to the length of the nip portion) is set according to the transfer material having the largest paper passing width, when a transfer material having a small paper passing width is passed through the nip portion. , The non-sheet passing area becomes large.
【０００５】[0005]
【発明が解決しようとする課題】従来の技術によると、
非通紙領域の温度が、通紙領域の温度よりも高くなっ
て、転写材にしわが発生することがあった。すなわち、
加熱ローラは、ヒータによってその外周面全体が一様な
温度になるように加熱されている。そして加熱ローラ外
周面の通紙領域は、転写材が直接接触する領域であっ
て、この領域では転写材によって熱が奪われ、加熱ロー
ラ外周面の表面温度が低下するのに反し、非通紙領域で
は転写材によって熱が奪われることがなく、加熱ローラ
表面全体に温度ムラが生じる。この加熱ローラ表面の温
度ムラは、ニップ部を同サイズの転写材が連続して通過
するときに顕著に表われる。このとき、加熱ローラ上の
トナーを確実に定着するために、加熱ローラの表面温度
を通紙領域にあわせて設定すると非通紙領域が非常に高
温になってしまうことになる。According to the prior art,
The temperature of the non-paper passing area becomes higher than the temperature of the paper passing area, and the transfer material sometimes wrinkles. That is,
The heating roller is heated by a heater so that the entire outer peripheral surface of the heating roller has a uniform temperature. The paper passing area on the outer peripheral surface of the heating roller is an area where the transfer material comes into direct contact. In this area, heat is taken away by the transfer material and the surface temperature of the outer peripheral surface of the heating roller decreases, whereas In the area, heat is not taken by the transfer material, and temperature unevenness occurs on the entire surface of the heating roller. The temperature unevenness on the surface of the heating roller is noticeable when transfer materials of the same size continuously pass through the nip portion. At this time, in order to reliably fix the toner on the heating roller, if the surface temperature of the heating roller is set in accordance with the paper passing area, the non-paper passing area becomes extremely high.
【０００６】このように、加熱ローラの通紙領域と非通
紙領域に大きな温度差が生じると、これに接触してニッ
プ部を形成している加圧ローラも同様に温度ムラが発生
し、熱膨張による変形にムラが生じ、ニップ部の当接圧
が変化する。通紙領域の当接圧が低くなり、非通紙領域
の当接圧が高くなる。したがって、例えば通紙幅の狭い
転写材を連続通紙した後に、幅の広い転写材を通紙した
場合に、この幅の広い転写材の、幅方向のニップ部での
当接圧について、前回通紙部であった中央側の当接圧が
低く、前回非通紙領域であった左右両側付近の当接圧が
強くなり、この結果、しわが発生することになる。As described above, when a large temperature difference occurs between the paper passing area and the non-paper passing area of the heating roller, temperature unevenness similarly occurs in the pressure roller which is in contact with the heating roller and forms the nip portion. The deformation due to thermal expansion becomes uneven, and the contact pressure at the nip changes. The contact pressure in the paper passing area becomes low, and the contact pressure in the non-paper passing area becomes high. Therefore, for example, when a wide transfer material is passed after continuously passing a narrow transfer material, the contact pressure of the wide transfer material at the nip portion in the width direction is set to the previous value. The contact pressure on the center side, which is the paper portion, is low, and the contact pressure on the left and right sides, which was the non-sheet passing area last time, is strong, and as a result, wrinkles occur.
【０００７】そこで、本発明は、小サイズの転写材を定
着する際の、加熱部材や加圧部材の非通紙部の昇温、及
び非通紙部の昇温により生じる転写材のしわや定着装置
の軸受け部の破損等を抑えることのできる画像形成装置
を提供することを目的とするものである。Therefore, according to the present invention, the temperature of the non-sheet passing portion of the heating member and the pressure member when the small-sized transfer material is fixed, and the wrinkles of the transfer material caused by the temperature rise of the non-sheet passing portion are fixed. An object of the present invention is to provide an image forming apparatus capable of suppressing damage to a bearing portion of a fixing device.
【０００８】[0008]
【課題を解決するための手段】請求項１に係る発明は、
設定温度に維持される加熱部材と、前記加熱部材と協働
してニップを形成する加圧部材とを有し、前記ニップに
画像を担持する記録材を通紙して画像を定着する定着手
段と、記録材のサイズを検知するサイズ検知手段と、を
有する画像形成装置において、記録材を連続通紙する場
合であって前記記録材のサイズが所定サイズより大きい
場合は、先の記録材と後の記録材との間隔を前記記録材
のサイズによらず一定とし、記録材を連続通紙する場合
であって前記記録材のサイズが前記所定サイズより小さ
い場合は、先の記録材と後の記録材との間隔を前記記録
材のサイズにより変動させて単位時間当たりの通紙枚数
を記録材のサイズによらず一定とし、かつ前記単位時間
当たりの通紙枚数を最大サイズの記録材を連続通紙する
場合の単位時間当たりの通紙枚数より少なくし、更に所
定枚数の記録材を連続通紙したことに応じて前記設定温
度を下げる、ことを特徴とする。The invention according to claim 1 is
A fixing unit that has a heating member that is maintained at a set temperature and a pressure member that forms a nip in cooperation with the heating member, and that feeds a recording material carrying an image to the nip to fix the image. And an image forming apparatus having a size detecting means for detecting the size of the recording material, in the case of continuously passing the recording material and when the size of the recording material is larger than a predetermined size, When the distance between the recording material and the subsequent recording material is constant regardless of the size of the recording material, and when the recording material is continuously fed and the size of the recording material is smaller than the predetermined size, Record the distance from the recording material
The number of sheets passed per unit time is kept constant regardless of the size of the recording material by changing it according to the size of the material , and
The maximum size of recording material is passed continuously
In this case, the number of sheets passed per unit time is smaller than the number of sheets passed, and the set temperature is lowered when a predetermined number of sheets of recording material are continuously passed.
【０００９】請求項２に係る発明は、請求項１に記載の
画像形成装置において、前記サイズ検知手段は、記録材
の先端及び後端の通過を測定することで記録材の搬送方
向のサイズを検知する、ことを特徴とする。According to a second aspect of the present invention, in the image forming apparatus according to the first aspect, the size detecting means is a recording material.
How to convey the recording material by measuring the passage of the leading and trailing edges of the
The feature is that the size of the orientation is detected .
【００１０】[0010]
【実施例】以下、図面に沿って、本発明の実施例につい
て説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１１】図３は、本発明の前提となる定着装置を備
えたレーザビームプリンタ（画像形成装置）２１の概略
を図示している。以下に構成と動作を簡単に説明する。FIG . 3 schematically shows a laser beam printer (image forming apparatus) 21 provided with a fixing device which is a premise of the present invention. The configuration and operation will be briefly described below.
【００１２】レーザビームプリンタ２１の装置本体のほ
ぼ中央部には感光ドラム２２が回転自在に支持されてい
る。感光ドラム２２の表面に帯電ローラ２５を用いて均
一帯電を行う。次いで、レーザスキャナ２３によりミラ
ー２４を介して画像をイメージ露光して潜像を形成す
る。次に、現像器２６中のトナーＴを現像ローラ２７に
よって現像する。一方、用紙カセット３３に積載された
転写材Ｐは給紙ローラ３２によって給紙され、後端検知
センサ３４で転写材サイズ検知を行い、レジストローラ
３１に送られる。転写材Ｐはレジストセンサ３５によっ
て検知され、先端をレジストローラ３１にかまれた状態
で待機しており、感光ドラム２２上に書込まれた画像に
同期をとるように転写ローラ３０に送られ画像が転写さ
れる。転写材Ｐに転写されたトナーＴは定着器３６によ
って定着され、転写材Ｐは排出ローラ３７によって装置
本体外に排出される。一方、感光ドラム２２上に転写
後、残留しているトナーＴはクリーナ２９によってクリ
ーニングされ、後段のプロセスへと移行する。A photosensitive drum 22 is rotatably supported at a substantially central portion of the main body of the laser beam printer 21. The surface of the photosensitive drum 22 is uniformly charged by using the charging roller 25. Then, the laser scanner 23 exposes the image through the mirror 24 to form a latent image. Next, the toner T in the developing device 26 is developed by the developing roller 27. On the other hand, the transfer material P loaded on the paper cassette 33 is fed by the paper feed roller 32, the transfer material size is detected by the trailing edge detection sensor 34, and the transfer material P is sent to the registration roller 31. The transfer material P is detected by the registration sensor 35, stands by with the front end bitten by the registration roller 31, and is sent to the transfer roller 30 in synchronism with the image written on the photosensitive drum 22. Is transcribed. The toner T transferred to the transfer material P is fixed by the fixing device 36, and the transfer material P is discharged to the outside of the apparatus main body by the discharge roller 37. On the other hand, the toner T remaining after being transferred onto the photosensitive drum 22 is cleaned by the cleaner 29, and the process proceeds to the subsequent process.
【００１３】次に、定着器３６の構成を図４に示す。上
側に配置された加熱ローラ（定着ローラ）４０は、アル
ミニウム、鉄等のパイプ材にＰＦＡ、ＰＴＦＥといった
離型層を被覆したパイプ状の肉厚２．０ｍｍ、外径２５
ｍｍのローラである。Next, the structure of the fixing device 36 is shown in FIG. The heating roller (fixing roller) 40 arranged on the upper side is a pipe-shaped wall thickness of 2.0 mm and an outer diameter of 25, which is formed by coating a pipe material such as aluminum or iron with a release layer such as PFA or PTFE.
mm roller.
【００１４】上記加熱ローラ４０に総圧７ｋｇで圧接し
て配設された加圧ローラ４１は芯金の上にシリコンゴ
ム、フッ素ゴム等の耐熱弾性体の層を形成した硬度４５
度（アスカーＣ）、芯金径８ｍｍ、外径２０ｍｍのロー
ラである。上記加熱ローラ４０と加圧ローラ４１とには
転写材Ｐが通紙され、転写材Ｐ上のトナーＴは加熱ロー
ラ４０と加圧ローラ４１との間で加熱及び加圧されて定
着される。上記加熱ローラ４０の内部にはヒータ４２が
配設されており、加熱ローラ４０を内部より加熱する。
また、上記加熱ローラ４０の表面には温度検知手段たる
温度検知素子４３が当接しており、加熱ローラ４０の温
度を検出する。ヒータ４２には、これをオンオフするヒ
ータ駆動手段４４が接続されている。ヒータ駆動手段４
４の制御手段４５は該温度検知素子４３からのデータに
基づいてヒータ駆動手段４４を制御してヒータ４２の断
続的な駆動（オンオフ）を行い加熱ローラ４０の表面温
度を所定の定着温度（プリント温度）または非定着時の
待機温度（スタンバイ温度）に保つようになっている。A pressure roller 41, which is arranged in pressure contact with the heating roller 40 at a total pressure of 7 kg, has a hardness of 45 in which a layer of heat resistant elastic material such as silicon rubber or fluororubber is formed on a core metal.
The roller has a degree (Asker C), a core metal diameter of 8 mm, and an outer diameter of 20 mm. The transfer material P is passed through the heating roller 40 and the pressure roller 41, and the toner T on the transfer material P is heated and pressed between the heating roller 40 and the pressure roller 41 to be fixed. A heater 42 is provided inside the heating roller 40, and heats the heating roller 40 from the inside.
Further, a temperature detecting element 43 as a temperature detecting means is in contact with the surface of the heating roller 40 to detect the temperature of the heating roller 40. The heater 42 is connected to a heater driving means 44 for turning the heater on and off. Heater driving means 4
The control means 45 of the No. 4 controls the heater driving means 44 based on the data from the temperature detecting element 43 to intermittently drive (turn on / off) the heater 42 to change the surface temperature of the heating roller 40 to a predetermined fixing temperature (printing temperature). Temperature) or the standby temperature during non-fixing (standby temperature).
【００１５】さらに、定着器３６は、図２に示すよう
に、転写材上の非画像域に温度検知素子４３を配置し転
写材Ｐのサイズによらず加熱ローラ４０上のａ点を転写
材端部が通過する片側基準の構成である。[0015] Furthermore, Fixing 36, as shown in FIG. 2, the point a on the heating roller 40 regardless of the size of the transfer material P to place the temperature sensing element 43 in the non-image area on the transfer material This is a one-sided reference configuration through which the transfer material end passes.
【００１６】図５は普通紙（Ａ４サイズ等）をプリント
する場合の温調（温度調整）である。搬送方向の紙サイ
ズＬ1をセンサにより検知し、Ｌ1≧２４５ｍｍの場合は
普通紙（Ａ４サイズ等）と判断している。プロセススピ
ード（紙送りスピード）が５０ｍｍ／ｓｅｃの画像形成
装置で紙サイズを普通紙（Ａ４サイズ等）と判断した場
合はスループット（紙送りのタイミング）をＡ４通紙時
に８（枚／分）であるように制御し、このときの（紙搬
送時の）紙間をＬ2′とすると、Ｌ1≧２４５ｍｍの場合
は紙サイズＬ1によらず紙間Ｌ2は常にＬ2′で一定とし
ている。[0016] Figure 5 is Ru temperature control (temperature control) der when printing a widely paper feed (A4 size). The conveyance direction of paper size L 1 is detected by the sensor, in the case of L 1 ≧ 245mm you are determined to plain paper (A4 size). Profile Seth speed plain paper sheet size (paper feeding speed) of the image forming apparatus of 50 mm / sec (A4 size) throughput when it is determined that 8 (paper feed timing) when A4 copies paper (sheets / minute) controlled to be constant in this case between (during web transport) paper 'when, in the case of L 1 ≧ 245mm always paper between L 2 regardless of the sheet size L 1 L 2' L 2 in I am trying.
【００１７】また、Ｌ１＜２４５ｍｍの場合は封筒サイ
ズと判断し、スループットは紙サイズＬ１によらず常に
８（枚／分）で一定とする。このときの紙間Ｌ２は紙サ
イズＬ１により変動する。これら紙サイズＬ１、紙間Ｌ
２の検知手段については後述する。When L 1 <245 mm, it is determined that the size is an envelope, and the throughput is always 8 (sheets / minute) regardless of the paper size L 1 . The paper interval L 2 at this time varies depending on the paper size L 1 . Paper size L 1 and paper interval L
The second detection means will be described later.
【００１８】図６にプリント温度１８５℃、スループッ
ト８（枚／分）でＡ４紙（２１０×２９７ｍｍ）を連続
通紙した場合の加熱ローラ４０の表面の温度分布を示
す。同図から分かるように転写材幅の広い普通紙を連続
通紙した場合の加熱ローラ表面の温度分布はほぼフラッ
トである。しかし、図２に示した片側基準の構成で温度
検知素子４３が転写材上の非画像域に配置される定着器
３６では、転写材幅の狭い封筒等を連続通紙した場合に
転写材Ｐに熱エネルギを奪われない加熱ローラ非通紙部
の表面温度が上昇してしまう。この様子を図７、図８に
示す。図７の２−ａはプリント温度１８５℃、スループ
ットは普通紙通紙時よりも紙間を広げ８（枚／分）と
し、封筒（１０６×２４１ｍｍ）を連続通紙した場合の
加熱ローラ表面の温度分布である。また、図８はこのと
きの加熱ローラ非通紙部側の軸受部の温度上昇である。
図７、図８から分かるようにプリント温度１８５℃、ス
ループット８（枚／分）で封筒を連続通紙すると加熱ロ
ーラ軸受部の温度はおよそ２３３℃まで達してしまい、
加熱ローラ軸受部の耐熱温度を超えてしまう。加熱ロー
ラ４０の軸受けは通常ＰＰＳ（ポリフェニレンサルファ
イド）系の樹脂がベースとなっていて、その耐熱温度は
２３０℃付近である。このためプリント温度１８５℃、
スループット８（枚／分）で転写材幅の狭い封筒等を連
続通紙すると加熱ローラ４０の軸受けを破損するおそれ
がある。FIG. 6 shows the temperature distribution on the surface of the heating roller 40 when A4 paper (210 × 297 mm) is continuously fed at a printing temperature of 185 ° C. and a throughput of 8 (sheets / minute). As can be seen from the figure, the temperature distribution on the surface of the heating roller is almost flat when plain paper having a wide transfer material is continuously fed. However, in the fixing device 36 in which the temperature detection element 43 is arranged in the non-image area on the transfer material in the one-sided reference configuration shown in FIG. 2, the transfer material P is continuously fed when an envelope having a narrow transfer material width is passed. The surface temperature of the non-sheet passing portion of the heating roller which is not deprived of heat energy rises. This state is shown in FIGS. 7 and 8. 2-a in FIG. 7 shows the print temperature of 185 ° C., the throughput is 8 (sheets / minute) with the paper interval expanded more than when plain paper is passed, and the surface of the heating roller when an envelope (106 × 241 mm) is continuously passed. It is a temperature distribution. FIG. 8 shows the temperature rise of the bearing portion on the non-sheet passing portion side of the heating roller at this time.
As can be seen from FIGS. 7 and 8, when the envelope is continuously fed at a printing temperature of 185 ° C. and a throughput of 8 (sheets / minute), the temperature of the heating roller bearing portion reaches about 233 ° C.,
The heat resistant temperature of the heating roller bearing will be exceeded. The bearing of the heating roller 40 is usually based on PPS (polyphenylene sulfide) resin, and its heat resistant temperature is around 230 ° C. Therefore, the printing temperature is 185 ℃,
If an envelope or the like having a narrow transfer material width is continuously fed at a throughput of 8 (sheets / minute), the bearing of the heating roller 40 may be damaged.
【００１９】片側基準機で封筒通紙時のスループットが
８（枚／分）であると温度検知素子４３であるサーミス
タ当接部の加熱ローラ表面温度は、紙によって熱エネル
ギを奪われる状態でプリント時の温調を行っているた
め、非通紙部の加熱ローラ表面温度よりも低くなる。ま
た、紙によって直接エネルギを奪われない非通紙部の加
熱ローラ表面温度は高くなるため熱エネルギは温度の低
い部分へ移動する。しかし、スループットが８（枚／
分）の場合プリント時の温調によってヒータから供給さ
れる熱エネルギの方が移動する熱エネルギよりも多いた
め加熱ローラ４０の非通紙部に熱エネルギが蓄積されて
しまい、通紙部の加熱ローラ表面温度よりも非通紙部の
加熱ローラ表面温度の方が高くなる。このとき、通紙部
に当接され温度検知を行っているサーミスタ部の加熱ロ
ーラ表面温度と非通紙部の加熱ローラ軸受部の温度差は
およそ４８℃となる。The heating roller surface temperature of the thermistor abutting portion which is a temperature sensing element 43 and throughput time of the envelope sheet passing is 8 (sheets / min) in the strip-side reference apparatus, in a state deprived of thermal energy by means of a sheet Since the temperature is controlled during printing, the temperature becomes lower than the surface temperature of the heating roller in the non-sheet passing area. Further, since the surface temperature of the heating roller in the non-sheet passing portion where the energy is not directly absorbed by the paper becomes high, the heat energy moves to the low temperature portion. However, the throughput is 8 (sheets /
In the case of (min.), Since the heat energy supplied from the heater is larger than the moving heat energy due to the temperature control during printing, the heat energy is accumulated in the non-paper passing portion of the heating roller 40, and the paper passing portion is heated. The heating roller surface temperature of the non-sheet passing portion is higher than the roller surface temperature. At this time, the temperature difference between the heating roller surface temperature of the thermistor portion that is in contact with the paper passing portion and detects the temperature and the temperature of the heating roller bearing portion of the non-paper passing portion is about 48 ° C.
【００２０】通紙部と非通紙部との加熱ローラ表面の温
度差を減少させるには、熱エネルギの移動よりもヒータ
４２からの熱エネルギの供給を少なくすればよい。ヒー
タ４２からの熱エネルギの供給を減少させるにはプリン
ト温度を下げてヒータ点灯の回数を減少させればよい。In order to reduce the temperature difference on the surface of the heating roller between the paper passing portion and the non-paper passing portion, the supply of heat energy from the heater 42 may be made smaller than the movement of heat energy. In order to reduce the supply of heat energy from the heater 42, the print temperature may be lowered to reduce the number of times the heater is turned on.
【００２１】そこで転写材幅の狭い封筒等を連続通紙す
る場合には、連続プリントがある一定の枚数となった時
点でプリント温度を下げる制御を行うこととする。連続
プリント枚数によってプリント温度を下げることが可能
な理由は通紙を行うと紙間で加圧ローラ４１が温まるこ
とにより定着性が向上するためである。しかも、封筒通
紙の場合、スループットを８（枚／分）に固定するた
め、普通サイズ紙通紙に比べて紙間が広がり、この効果
が高まる。さらに、図７から分かるようにニップ幅が狭
く定着性が低下するローラ中央部の加熱ローラ表面温度
は非通紙部の昇温によって高くなり定着性は向上する。[0021] When the where to continuously printed a narrow envelopes or the like having rolling Utsushizai width, and performing control to reduce the print temperature at the time when a certain number of sheets is continuously printed. The reason why the printing temperature can be lowered depending on the number of continuously printed sheets is that the fixing roller is improved by heating the pressure roller 41 between sheets when the sheet is passed. However even if the envelope paper passage, in order to secure the throughput 8 (sheets / minute), spread sheet interval as compared with normal sized sheet passing, increases this effect. Further, as can be seen from FIG. 7, the surface temperature of the heating roller in the central portion of the roller where the nip width is narrow and the fixability is lowered is increased by the temperature rise of the non-sheet passing portion, and the fixability is improved.
【００２２】図１に転写材幅の狭い封筒等を連続通紙し
た場合に行う温調を示す。時間ｔ１で本体の電源を入れ
加熱ローラ表面温度が１７５℃となったｔ２よりスタン
バイ温調を１７５℃で行う。時間ｔ２で封筒のプリント
を開始すると、通紙枚数が２５枚となるｔ４までの間は
１８５℃でプリント温調を行い、ｔ４以後は１８０℃で
プリント温調を行うこととする。 [0022] If a narrow envelope like the transfer material width was continuously printed in FIG. 1 shows a row intends temperature control. At time t 1 , the main body is turned on and the standby temperature is adjusted at 175 ° C. from t 2 when the surface temperature of the heating roller reaches 175 ° C. Upon starting the printing of the envelope at time t 2, until t 4 when number of fed sheets is 25 sheets performs print temperature control at 185 ° C., t 4 thereafter to be performed print temperature control at 180 ° C..
【００２３】図９、図１０に上記の温調制御で連続プリ
ントした場合の非通紙部の加熱ローラ表面温度の上昇を
示す。図９の４−ａは時間ｔ４（図１）の加熱ローラ表
面の温度分布であり、４−ｂは時間ｔ４以後での加熱ロ
ーラ表面の温度分布である。また、図１０はこのときの
加熱ローラ非通紙部側の軸受部の温度上昇である。これ
らの図から分かるように温調制御で封筒の連続通紙を行
うと加熱ローラ軸受部の温度はおよそ２２８℃まで上が
るが、これは加熱ローラ軸受の耐熱温度以内におさまり
定着器３６を破損することはない。FIG. 9 and FIG. 10 show the rise of the surface temperature of the heating roller in the non-sheet passing portion when continuous printing is performed by the above temperature control. 9A is a temperature distribution on the heating roller surface at time t 4 (FIG. 1), and 4-b is a temperature distribution on the heating roller surface after time t 4 . Further, FIG. 10 shows the temperature rise of the bearing portion on the non-sheet passing portion side of the heating roller at this time. The temperature of the heating roller bearing unit performs continuous printing envelopes with the temperature control can be seen from these figures rises to approximately 228 ° C., which damage the fuser 36 fits within the heat resistance temperature of the heating roller bearings There is no such thing.
【００２４】この例では、後端検知センサ３４により転
写材Ｐのサイズを測定し、これに基づいて普通紙と封筒
とのサイズを切り替えた。転写材Ｐのサイズは後端検知
センサ３４に転写材先端が入ってから、転写材後端がぬ
けるまでの時間ｔ（ｓｅｃ）を測定し、この値とプロセ
ススピードＶｐ＝５０（ｍｍ／ｓｅｃ）より、搬送方向
の紙の長さＬ1（ｍｍ）はＬ1＝５０×ｔで求めることが
できる。搬送方向の長さの長い封筒のサイズはほぼ（１
０６×２４１ｍｍ）である。よって、Ｌ1≦２４１（ｍ
ｍ）であれば封筒と判断することができるが、測定誤差
を見込んでＬ1＜２４５（ｍｍ）のときに封筒と判断す
ることとした。本実施例では後端検知センサ３４によっ
て転写材サイズの判断を行ったが、同様のことをレジス
トセンサ３５を用いて行うこともできる。また、本実施
例でスループットを８（枚／分）と固定したが、これは
後端検知センサ３４を用いて紙間を制御することによっ
て行った。図１１に紙間の求め方を示す。紙の搬送方向
の長さＬ1（ｍｍ）、求める紙間をＬ2（ｍｍ）、プロセ
ススピードＶｐ＝５０（ｍｍ／ｓｅｃ）とすると、スル
ープット８（枚／分）のとき、紙間は、
Ｌ2＝（５０×６０−８×Ｌ1）／７
である。In this example , the size of the transfer material P was measured by the trailing edge detection sensor 34, and the sizes of the plain paper and the envelope were switched based on this. For the size of the transfer material P, the time t (sec) from when the front end of the transfer material enters the rear end detection sensor 34 to when the rear end of the transfer material passes is measured, and this value and process speed Vp = 50 (mm / sec) Therefore, the length L 1 (mm) of the paper in the carrying direction can be obtained by L 1 = 50 × t. The size of an envelope with a long length in the transport direction is almost (1
06 × 241 mm). Therefore, L 1 ≦ 241 (m
If it is m), it can be judged as an envelope, but in consideration of the measurement error, it was judged as an envelope when L 1 <245 (mm). In this embodiment, the transfer material size is determined by the trailing edge detection sensor 34, but the same thing can be done by using the registration sensor 35. Further, in this embodiment, the throughput was fixed at 8 (sheets / minute), but this was done by controlling the sheet interval using the trailing edge detection sensor 34. FIG. 11 shows how to find the space between sheets. Assuming that the length L 1 (mm) of the paper in the conveyance direction, the required paper interval L 2 (mm), and the process speed Vp = 50 (mm / sec), the paper interval is 8 when the throughput is 8 (sheets / minute). L 2 = (50 × 60−8 × L 1 ) / 7.
【００２５】このようにして、後端検知センサ３４また
はレジストセンサ３５により、搬送方向の転写材の長さ
を検知することにより、転写材幅が封筒サイズ以下であ
るかどうかの判断を行った。これにより、幅検知のセン
サなしで封筒サイズかどうかの判断が可能となる。封筒
のプリント枚数のカウントは、紙搬送のメインモータが
回転中にプリント信号を受けた場合に連続プリントとし
て枚数をカウントし、メインモータ停止後にプリント信
号を受けた場合は、加圧ローラ４１の温度が低下してい
る可能性があるため、０枚から再カウントし、１枚目か
らの温調制御を行うこととした。In this manner, the trailing edge detection sensor 34 or the registration sensor 35 detects the length of the transfer material in the conveying direction to determine whether the transfer material width is equal to or smaller than the envelope size. As a result, it is possible to determine whether the size is an envelope without a width detection sensor. The number of prints on the envelope is counted as continuous prints when a print signal is received while the main motor for paper conveyance is rotating. When the print signal is received after the main motor is stopped, the temperature of the pressure roller 41 is counted. Since there is a possibility that the temperature has decreased, it was decided to re-count from 0 sheets and to perform temperature control from the first sheet.
【００２６】以上の制御を行うことにより、転写材幅の
狭い封筒等を連続通紙した場合でも、加熱ローラ非通紙
部の表面温度の上昇を抑え、加熱ローラ軸受の破損を防
止できる。By performing the above control, even when an envelope or the like having a narrow transfer material width is continuously fed, it is possible to suppress an increase in the surface temperature of the heating roller non-sheet passing portion and prevent the heating roller bearing from being damaged.
【００２７】以下、更に本発明の実施例について説明す
る。本実施例の定着器３６はコストダウン、小型化を目
的とし、加熱ローラ肉厚１．８ｍｍ、外径２０ｍｍと、
実施例１よりも小径の加熱ローラ４０を用いる。一方、
加圧ローラ４１は実施例１と同様の構成とする。このよ
うに加熱ローラ４０の肉厚が薄いと加熱ローラ長手方向
での熱伝導性が低下してしまう。よって、転写材幅の狭
い封筒等を連続プリントすると熱の移動が起こりにくい
ため、封筒通紙部と非通紙部とで大きな温度分布の差が
生じてしまう。またプロセススピードは前述と同様に５
０ｍｍ／ｓｅｃとする。 Examples of the present invention will be further described below.
It The fixing device 36 of this embodiment has a heating roller wall thickness of 1.8 mm and an outer diameter of 20 mm for the purpose of cost reduction and downsizing.
The heating roller 40 having a smaller diameter than that of the first embodiment is used. on the other hand,
The pressure roller 41 has the same configuration as that of the first embodiment. When the thickness of the heating roller 40 is thin in this way, the thermal conductivity in the longitudinal direction of the heating roller decreases. Therefore, when an envelope or the like having a narrow transfer material width is continuously printed, heat is less likely to be transferred, and a large temperature distribution difference occurs between the envelope paper-passing portion and the non-paper-passing portion. Also in the same way as before the process speed predicates 5
0 mm / sec.
【００２８】さらに、本実施例の画像形成装置は片側基
準の構成である。このような構成であると、転写材幅の
狭い封筒等を連続通紙した場合に転写材Ｐに熱エネルギ
を奪われない加熱ローラ非通紙部の表面温度が上昇して
しまう。この様子を図１２、図１３に示す。図１２の６
−ａは本実施例の定着器３６を用い、プリント温度１８
５℃、スループットは普通紙、通紙時よりも紙間を広げ
８（枚／分）とし封筒（１０６×２４１ｍｍ）を連続通
紙した場合の加熱ローラ表面の温度分布である。また、
図１３はこのときの加熱ローラ非通紙部側の軸受部の温
度上昇である。図１２、図１３から分かるように本実施
例の定着器３６を用い、プリント温度１８５℃、スルー
プット８（枚／分）で封筒を連続通紙すると加熱ローラ
軸受部の温度はおよそ２４０℃まで達してしまい、加熱
ローラ軸受の耐熱温度を超えてしまう。加熱ローラ４０
の軸受けは通常ＰＰＳ（ポリフェニレンサルファイド）
系の樹脂がベースとなっていて、その耐熱温度は２３０
℃付近である。このため本実施例の定着器３６を用い、
プリント温度１８５℃、スループット８（枚／分）で転
写材幅の狭い封筒等を連続通紙すると加熱ローラ軸受け
を破損する虞れがある。Furthermore, the image forming apparatus of the present embodiment is a configuration of a single-side reference. With such a configuration, when an envelope or the like having a narrow transfer material width is continuously fed, the surface temperature of the heating roller non-sheet passing portion where the transfer material P does not absorb heat energy increases. This state is shown in FIGS. 6 of FIG.
-A is the fixing device 36 of the present embodiment, the printing temperature is 18
The temperature distribution is 5 ° C., the throughput is plain paper, and the temperature distribution on the surface of the heating roller when the envelope (106 × 241 mm) is continuously fed with the paper interval expanded to 8 (sheets / minute) as compared to when the paper is passed. Also,
FIG. 13 shows the temperature rise of the bearing portion on the heating roller non-sheet passing portion side at this time. As can be seen from FIGS. 12 and 13, when the fixing device 36 of the present embodiment is used and an envelope is continuously fed at a printing temperature of 185 ° C. and a throughput of 8 (sheets / minute), the temperature of the heating roller bearing portion reaches approximately 240 ° C. Will exceed the heat resistant temperature of the heating roller bearing. Heating roller 40
Bearings are usually PPS (polyphenylene sulfide)
It is based on a resin of a series, and its heat resistant temperature is 230
It is around ℃. Therefore, using the fixing device 36 of the present embodiment,
If an envelope or the like having a narrow transfer material width is continuously fed at a printing temperature of 185 ° C. and a throughput of 8 (sheets / minute), the heating roller bearing may be damaged.
【００２９】片側基準機で封筒通紙時のスループットが
８（枚／分）であると温度検知素子４３であるサーミス
タ当接部の加熱ローラ表面温度は紙によって熱エネルギ
を奪われる状態でプリント時の温調を行っているため非
通紙部の加熱ローラ表面温度よりも低くなる。また紙に
よって直接熱エネルギを奪われない非通紙部の加熱ロー
ラ表面温度は高くなるため熱エネルギは温度の低い部分
へ移動する。しかし、スループットが８（枚／分）の場
合、プリント時の温調によってヒータ４２から供給され
る熱エネルギの方が移動する熱エネルギよりも多いため
加熱ローラ４０の非通紙部に熱エネルギが蓄積されてし
まい、通紙部の加熱ローラ表面温度よりも非通紙部の加
熱ローラ表面温度の方が高くなる。このとき、通紙部に
当接され温度検知を行っているサーミスタ部の加熱ロー
ラ表面温度と非通紙部の加熱ローラ軸受部の温度差はお
よそ５５℃となる。The heating roller surface temperature of the thermistor abutting portion throughput during envelope paper feed is at a temperature sensing element 43 is 8 (sheets / min) in strip side reference machine printed in a state deprived of thermal energy by means of a sheet Since the temperature is controlled at the time, the temperature becomes lower than the surface temperature of the heating roller in the non-sheet passing portion. Further, since the surface temperature of the heating roller in the non-sheet passing portion where the heat energy is not directly absorbed by the paper becomes high, the heat energy moves to the low temperature portion. However, when the throughput is 8 (sheets / minute), the heat energy supplied from the heater 42 is larger than the moving heat energy due to the temperature control during printing, and therefore the heat energy is applied to the non-sheet passing portion of the heating roller 40. The heat roller surface temperature of the non-paper passing portion becomes higher than that of the heating roller surface of the paper passing portion. At this time, the temperature difference between the surface of the heating roller of the thermistor portion that is in contact with the paper passing portion and detects the temperature and the temperature of the heating roller bearing portion of the non-paper passing portion is about 55 ° C.
【００３０】通紙部と非通紙部の加熱ローラ表面の温度
差を減少させるには、熱エネルギの移動よりもヒータ４
２からの熱エネルギの供給を少なくすればよい。ヒータ
４２からの熱エネルギの供給を減少させるにはプリント
温度を下げるか、スループットを下げてヒータ４２点灯
の回数を減少させればよい。In order to reduce the temperature difference between the heating roller surface of the paper passing portion and the non-paper passing portion, the heater 4 is used rather than the transfer of heat energy.
The supply of heat energy from 2 should be reduced. In order to reduce the supply of heat energy from the heater 42, the print temperature may be lowered or the throughput may be lowered to reduce the number of times the heater 42 is turned on.
【００３１】そこで、転写材幅の狭い封筒等を連続通紙
する場合には紙間を制御して最大転写材のサイズのスル
ープットよりも遅くし（リーガルサイズ（２１５．９×
３５５．６ｍｍ）で７枚／分）、スループットを６（枚
／分）に固定する。このため封筒通紙時には、普通サイ
ズを通紙する場合よりも紙間が広がり、この紙間で加圧
ローラ４１が温まることによって定着性が向上する。し
かも、図１５から分かるようにニップ幅が狭く定着性が
低下するローラ中央部の加熱ローラ表面温度は、非通紙
部の昇温によって高くなり、定着性は向上する。さら
に、スループットを６（枚／分）とするため、時間当た
りに加熱ローラ４０から奪われる熱エネルギが減少する
ため、プリント枚数によりプリント温度を段階的に下げ
ることが可能である。よって、封筒等を連続通紙する場
合には、プリント枚数により、プリント温度を切り替え
る制御を行うこととする。[0031] where, rolling when a narrow Utsushizai width of envelopes to continuously printed is slower than the throughput of the size of the largest transfer material by controlling the sheet interval (Li Garusaizu (215.9 ×
75.6 sheets / min) at 355.6 mm) and the throughput is fixed at 6 sheets / minute. Therefore, when the envelope is passed, the gap between the sheets is wider than when the normal size is passed, and the pressure roller 41 is warmed between the sheets, so that the fixing property is improved. Moreover, as can be seen from FIG. 15, the heating roller surface temperature in the central portion of the roller where the nip width is narrow and the fixing property is lowered is increased by the temperature rise of the non-sheet passing portion, and the fixing property is improved. Further, since the throughput is 6 (sheets / minute), the heat energy taken from the heating roller 40 per hour is reduced, so that the printing temperature can be lowered stepwise depending on the number of printed sheets. By, in the case of continuously printed the envelope or the like, the number of prints, and to perform the control of switching the print temperature.
【００３２】図１４に転写材幅の狭い封筒等を連続通紙
した場合に行う温調を示す。時間ｔ１で本体の電源を入
れ、加熱ローラ表面温度が１７５℃となったｔ２よりス
タンバイ温調を１７５℃で行う。時間ｔ３で封筒のプリ
ントを開始すると通紙枚数が２５枚となるｔ４までの間
は１８５℃でプリント温調を行い、ｔ４以後は１８０℃
でプリント温調を行うこととする。[0032] When it is continuously printed a narrow envelope like the transfer material width 14 shows a row intends temperature control. The power of the main body is turned on at time t 1 , and the standby temperature control is performed at 175 ° C. from t 2 when the heating roller surface temperature reaches 175 ° C. When the printing of the envelope is started at time t 3 , the print temperature is adjusted at 185 ° C. until t 4 when the number of passing sheets reaches 25, and 180 ° C. after t 4.
Print temperature control will be performed.
【００３３】図１５、図１６に上記の温調制御で連続プ
リントした場合の非通紙部の加熱ローラ表面温度の上昇
を示す。図１５の８−ａは時間ｔ４（図１４）の加熱ロ
ーラ表面の温度分布であり、８−ｂはｔ４以後での加熱
ローラ表面の温度分布である。また、図１６は、このと
きの加熱ローラ非通紙部側の軸受部の温度上昇である。
これらの図から分かるように温調制御で封筒の連続通紙
を行うと加熱ローラ軸受部の温度はおよそ２２３℃まで
上がるが、これは加熱ローラ軸受の耐熱温度２３０℃以
内におさまり定着器３６を破損することはない。FIGS. 15 and 16 show the rise in the surface temperature of the heating roller in the non-sheet passing portion when continuous printing is performed by the above temperature control. 8-a in FIG. 15 is the temperature distribution on the heating roller surface at time t 4 (FIG. 14), and 8-b is the temperature distribution on the heating roller surface after t 4 . Further, FIG. 16 shows the temperature rise of the bearing portion on the non-sheet passing side of the heating roller at this time.
While up until the temperature of the heating roller bearing unit performs envelope continuous paper feed by the temperature control as can be seen from these figures is about 223 ° C., which is a fixing unit 36 fit within the heat resistance temperature 230 ° C. of the heating roller bearings It will not be damaged.
【００３４】本実施例でスループットを６（枚／分）に
固定したが、これは後端検知センサ３４を用いて、紙間
を制御することによって行った。図１１に紙間の求め方
を示す。紙の搬送方向の長さをＬ１（ｍｍ）、求める紙
間をＬ２（ｍｍ）、プロセススピードＶｐ＝５０（ｍｍ
／ｓｅｃ）とすると、スループット６（枚／分）のと
き、紙間は、
Ｌ２＝（５０×６０−４×Ｌ１）／５
となる。In this embodiment, the throughput was fixed at 6 (sheets / minute), but this was done by controlling the sheet interval using the trailing edge detection sensor 34. FIG. 11 shows how to find the space between sheets. The length of the paper in the conveying direction is L 1 (mm), the required paper distance is L 2 (mm), and the process speed Vp = 50 (mm
/ Sec), when the throughput is 6 (sheets / minute), the sheet interval is L 2 = (50 × 60−4 × L 1 ) / 5.
【００３５】封筒のプリント枚数のカウントは、紙搬送
のメインモータが回転中にプリント信号を受けた場合
に、連続プリントとして枚数をカウントし、メインモー
タ停止後にプリント信号を受けた場合は、加圧ローラ４
１の温度が低下している可能性があるため、０枚から再
カウントし、１枚目からの温調制御を行うこととした。The number of prints on the envelope is counted by counting the number of continuous prints when a print signal is received while the main motor for paper conveyance is rotating, and when the print signal is received after the main motor is stopped, pressurization is performed. Laura 4
Since the temperature of No. 1 may have decreased, it was decided to re-count from No. 0 and to perform temperature control from the first.
【００３６】以上の制御を行うことにより、肉厚の薄い
加熱ローラ４０を用い、転写材幅の狭い封筒等を連続通
紙した場合でも、加熱ローラ４０非通紙部の表面温度の
上昇を抑え、加熱ローラ４０軸受の破損を防止できる。By performing the above control, even when the thin heating roller 40 is used and an envelope or the like having a narrow transfer material width is continuously fed, the heating roller 40 is prevented from rising in the surface temperature of the non-sheet feeding portion. The damage of the heating roller 40 bearing can be prevented.
【００３７】[0037]
【発明の効果】以上説明したように、本発明によると、
所定サイズより大きい記録材を連続通紙する場合の定着
性及び単位時間当たりの出力枚数を犠牲にすることな
く、所定サイズより小さい記録材を連続通紙する場合の
非通紙部昇温を確実に抑えることができる。As described above, according to the present invention,
Without sacrificing output sheets per fixability and unit time in the case of continuously printed a larger recording material a predetermined size, ensure the non-sheet passing portion Atsushi Nobori in the case of continuously printed a smaller recording material than a predetermined size Can be suppressed to
【図１】本発明の前提となる加熱ローラの温調を示す
図。FIG. 1 is a diagram showing a temperature control of a heating roller which is a premise of the present invention .
【図２】本発明の前提となる定着装置の構成を示す図。FIG. 2 is a diagram showing a configuration of a fixing device which is a premise of the present invention .
【図３】本発明の前提となる画像形成装置の断面図。FIG. 3 is a sectional view of an image forming apparatus which is a premise of the present invention .
【図４】本発明の前提となる定着装置の構成を示す図。FIG. 4 is a diagram showing a configuration of a fixing device which is a premise of the present invention .
【図５】本発明の前提となる加熱ローラの温調を示す
図。FIG. 5 is a diagram showing the temperature control of the heating roller which is the premise of the present invention .
【図６】本発明の前提となる加熱ローラの表面温度を示
す図。FIG. 6 is a diagram showing a surface temperature of a heating roller which is a premise of the present invention .
【図７】本発明の前提となる加熱ローラの表面温度を示
す図。FIG. 7 is a diagram showing a surface temperature of a heating roller which is a premise of the present invention .
【図８】本発明の前提となる加熱ローラの表面温度を示
す図。FIG. 8 is a diagram showing a surface temperature of a heating roller which is a premise of the present invention .
【図９】本発明の前提となる加熱ローラの表面温度を示
す図。FIG. 9 is a diagram showing a surface temperature of a heating roller which is a premise of the present invention .
【図１０】本発明の前提となる加熱ローラの表面温度を
示す図。FIG. 10 is a diagram showing a surface temperature of a heating roller which is a premise of the present invention .
【図１１】本発明の前提となる通紙状態を示す図であ
る。FIG. 11 is a diagram showing a sheet passing state which is a premise of the present invention .
【図１２】本発明の実施例に係る加熱ローラの表面温度
を示す図。FIG. 12 is a diagram showing a surface temperature of a heating roller according to an example of the present invention .
【図１３】本発明の実施例に係る加熱ローラの表面温度
を示す図。FIG. 13 is a diagram showing the surface temperature of the heating roller according to the embodiment of the invention .
【図１４】本発明の実施例に係る加熱ローラの温調を示
す図。FIG. 14 is a diagram showing temperature control of the heating roller according to the embodiment of the present invention .
【図１５】本発明の実施例に係る加熱ローラの表面温度
を示す図。FIG. 15 is a diagram showing a surface temperature of a heating roller according to an example of the present invention .
【図１６】本発明の実施例に係る加熱ローラの表面温度
を示す図。FIG. 16 is a diagram showing a surface temperature of a heating roller according to an example of the present invention .
４０ 加熱ローラ（定着ローラ） ４１ 加圧ローラ ４２ ヒータ ４３ 温度検知素子（サーミスタ） ４４ ヒータ駆動手段 ４５ 制御手段 １０４ サイズ検知手段（後端検知センサ） １０５ サイズ検知手段（レジストセンサ） １０６ 定着手段（定着装置、定着器） １１０ 加熱ローラ １１１ 加圧ローラ １１３ 温度検知手段（温度検知素子） １１６ プリンタ動作遅延手段（ＣＰＵ） １１８ 転写材供給手段（給紙部駆動手段） Ｎ ニップ部 Ｐ 転写材 40 Heating roller (fixing roller) 41 Pressure roller 42 heater 43 Temperature detection element (thermistor) 44 Heater driving means 45 Control means 104 size detection means (rear end detection sensor) 105 Size detection means (registration sensor) 106 fixing means (fixing device, fixing device) 110 heating roller 111 pressure roller 113 Temperature detection means (temperature detection element) 116 printer operation delay means (CPU) 118 Transfer Material Supplying Means (Feeding Unit Driving Means) N Nip part P transfer material
───────────────────────────────────────────────────── フロントページの続き (72)発明者 諏訪 貢一 東京都大田区下丸子３丁目30番２号 キ ヤノン株式会社内 (72)発明者 田中 裕子 東京都大田区下丸子３丁目30番２号 キ ヤノン株式会社内 (72)発明者 斉藤 哲雄 東京都大田区下丸子３丁目30番２号 キ ヤノン株式会社内 (56)参考文献 特開 平３−209493（ＪＰ，Ａ) 特開 昭57−63570（ＪＰ，Ａ) 実開 平２−149961（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G03G 15/20 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Suwa 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Yuko Tanaka 3-30-2 Shimomaruko, Ota-ku, Tokyo Ki In Canon Inc. (72) Inventor Tetsuo Saito 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) Reference JP-A-3-209493 (JP, A) JP-A-57-63570 ( JP, A) Actual Kaihei 2-149961 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) G03G 15/20
Claims (2)
加熱部材と協働してニップを形成する加圧部材とを有
し、前記ニップに画像を担持する記録材を通紙して画像
を定着する定着手段と、記録材のサイズを検知するサイ
ズ検知手段と、を有する画像形成装置において、 記録材を連続通紙する場合であって前記記録材のサイズ
が所定サイズより大きい場合は、先の記録材と後の記録
材との間隔を前記記録材のサイズによらず一定とし、 記録材を連続通紙する場合であって前記記録材のサイズ
が前記所定サイズより小さい場合は、先の記録材と後の
記録材との間隔を前記記録材のサイズにより変動させて
単位時間当たりの通紙枚数を記録材のサイズによらず一
定とし、かつ前記単位時間当たりの通紙枚数を最大サイ
ズの記録材を連続通紙する場合の単位時間当たりの通紙
枚数より少なくし、更に所定枚数の記録材を連続通紙し
たことに応じて前記設定温度を下げる、 ことを特徴とする画像形成装置。1. An image is formed by passing a recording material, which has a heating member that is maintained at a set temperature and that forms a nip in cooperation with the heating member, and carries an image on the nip. In an image forming apparatus having a fixing means for fixing the recording material and a size detecting means for detecting the size of the recording material, when the recording material is continuously fed and the size of the recording material is larger than a predetermined size, the interval between the preceding recording material and after the recording material is constant irrespective of the size of the recording material, when the size of the recording material in the case of continuously printed recording material is smaller than the predetermined size previously Recording material and later
The distance between the recording material and the recording material is varied according to the size of the recording material so that the number of sheets passed per unit time is constant regardless of the size of the recording material , and the number of sheets passed per unit time is the maximum size.
Paper per unit time when continuously passing the same recording material
The image forming apparatus is characterized in that the set temperature is reduced when the number of recording materials is reduced and the predetermined number of recording materials are continuously fed.
び後端の通過を測定することで記録材の搬送方向のサイ
ズを検知する、 ことを特徴とする請求項１に記載の画像形成装置。2.The size detecting means is provided at the leading edge of the recording material.
And the trailing edge are measured to measure the size of the recording material in the conveyance direction.
Detected, The image forming apparatus according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31127392A JP3437202B2 (en) | 1992-10-26 | 1992-10-26 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31127392A JP3437202B2 (en) | 1992-10-26 | 1992-10-26 | Image forming device |
Related Child Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001353823A Division JP2002214967A (en) | 2001-11-19 | 2001-11-19 | Image forming device |
| JP2001353821A Division JP2002196614A (en) | 2001-11-19 | 2001-11-19 | Image forming device |
| JP2001353822A Division JP2002202677A (en) | 2001-11-19 | 2001-11-19 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06138789A JPH06138789A (en) | 1994-05-20 |
| JP3437202B2 true JP3437202B2 (en) | 2003-08-18 |
Family
ID=18015156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31127392A Expired - Fee Related JP3437202B2 (en) | 1992-10-26 | 1992-10-26 | Image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3437202B2 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6381422B1 (en) | 2000-07-31 | 2002-04-30 | Toshiba Tec Kabushiki Kaisha | Image forming apparatus for fine-adjusting a fixation speed of a development material in accordance with temperature control |
| US7925177B2 (en) | 2004-07-21 | 2011-04-12 | Ricoh Co, Ltd. | Image fixing apparatus stably controlling a fixing temperature, and image forming apparatus using the same |
| JP5108401B2 (en) * | 2007-07-06 | 2012-12-26 | 株式会社リコー | Fixing device, image forming apparatus |
| JP5327716B2 (en) * | 2009-01-21 | 2013-10-30 | 株式会社リコー | Fixing apparatus and image forming apparatus |
| JP5510721B2 (en) * | 2010-05-07 | 2014-06-04 | 株式会社リコー | Fixing apparatus and image forming apparatus |
| JP5796714B2 (en) * | 2012-01-13 | 2015-10-21 | 株式会社リコー | Fixing apparatus and image forming apparatus |
| JP5880765B2 (en) * | 2012-01-13 | 2016-03-09 | 株式会社リコー | Fixing apparatus and image forming apparatus |
| JP6115167B2 (en) * | 2012-02-09 | 2017-04-19 | 株式会社リコー | Fixing apparatus and image forming apparatus |
| JP6213890B2 (en) * | 2012-09-14 | 2017-10-18 | 株式会社リコー | Fixing apparatus and image forming apparatus |
| JP6149497B2 (en) * | 2012-09-14 | 2017-06-21 | 株式会社リコー | Fixing apparatus and image forming apparatus |
| JP6303712B2 (en) * | 2013-05-29 | 2018-04-04 | 株式会社リコー | Fixing apparatus and image forming apparatus |
| US9535380B2 (en) * | 2013-05-29 | 2017-01-03 | Ricoh Company, Ltd. | Fixing device and image forming apparatus |
| JP6167670B2 (en) * | 2013-05-30 | 2017-07-26 | 株式会社リコー | Fixing apparatus and image forming apparatus |
-
1992
- 1992-10-26 JP JP31127392A patent/JP3437202B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06138789A (en) | 1994-05-20 |
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