JP4796441B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP4796441B2
JP4796441B2 JP2006153621A JP2006153621A JP4796441B2 JP 4796441 B2 JP4796441 B2 JP 4796441B2 JP 2006153621 A JP2006153621 A JP 2006153621A JP 2006153621 A JP2006153621 A JP 2006153621A JP 4796441 B2 JP4796441 B2 JP 4796441B2
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roller
transfer material
transfer
paper
image forming
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JP2007322813A (en
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康寿 岩田
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Ricoh Co Ltd
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Description

本発明は、電子写真方式の画像形成装置に関する。   The present invention relates to an electrophotographic image forming apparatus.

一般的な画像形成装置について、図3に基づきその構成と動作を併せて説明する。
給紙トレイ(給紙部)1にセットされた紙Pは、給紙ローラ2によって取り出されレジストローラ3で形成されたレジストニップAへ搬送される。レジストローラ3は作像プロセスとタイミングを合わせつつ紙Pを感光体5と転写ローラ9で形成された転写ニップBへ搬送する。感光体5の周囲には、帯電ユニット6、書き込みユニット7、現像ユニット8、転写ローラ9、クリーニングユニット10が配置される。
The configuration and operation of a general image forming apparatus will be described with reference to FIG.
The paper P set in the paper feed tray (paper feed unit) 1 is taken out by the paper feed roller 2 and conveyed to the registration nip A formed by the registration rollers 3. The registration roller 3 conveys the paper P to the transfer nip B formed by the photoconductor 5 and the transfer roller 9 in synchronization with the image forming process. Around the photosensitive member 5, a charging unit 6, a writing unit 7, a developing unit 8, a transfer roller 9, and a cleaning unit 10 are arranged.

作像プロセスを説明する。感光体5は図中反時計回りに回転する。まず帯電ユニット6により感光体5が帯電され、次にコントローラ15の制御により書き込みユニット7から射出された書き込みレーザLによって感光体5上に潜像が作像される。感光体5上の潜像は現像ユニット8内のトナーで現像されてトナー像となり、転写ニップBに搬送されてきた紙Pに転写される。
トナー像を転写された紙Pは、続いて定着ローラ11と加圧ローラ12で形成された定着ニップCに搬送され、熱と加圧によりトナー像が定着される。定着ハロゲンヒータ13は、定着ローラ11の表面に当接された定着サーミスタ14で検出された温度と設定温度が一致するように、コントローラ15の制御により点灯される。その後、図示しない排紙部により排紙が行われ、一連の画像形成プロセスが完了する。
The image forming process will be described. The photoconductor 5 rotates counterclockwise in the drawing. First, the photosensitive unit 5 is charged by the charging unit 6, and then a latent image is formed on the photosensitive member 5 by the writing laser L emitted from the writing unit 7 under the control of the controller 15. The latent image on the photoconductor 5 is developed with toner in the developing unit 8 to become a toner image, and is transferred to the paper P conveyed to the transfer nip B.
The paper P to which the toner image has been transferred is then conveyed to a fixing nip C formed by the fixing roller 11 and the pressure roller 12, and the toner image is fixed by heat and pressure. The fixing halogen heater 13 is turned on under the control of the controller 15 so that the temperature detected by the fixing thermistor 14 in contact with the surface of the fixing roller 11 matches the set temperature. Thereafter, the paper is discharged by a paper discharge unit (not shown), and a series of image forming processes is completed.

近年、インクジェット方式のプリンタが普及するにあたり、インクジェット用に表面コーティングされた紙がこれまでの普通紙と並べて販売されている。上記コーティング紙は表面層にコーティングが施されているが、電子写真方式の画像形成装置で使用すると、コーティング膜が定着部において熱で融解して定着ローラまたは定着ベルト表面素材との親和性により、定着ローラまたは定着ベルトに巻き付いてジャムが発生してしまう。
また、環境保護の観点から使用する紙量の削減を目的として、不要になった片側印刷紙を裏紙として再利用するケースが増えてきた。裏紙の画像にカラー写真画像などのトナーが多く使用されている場合、定着部において溶融したトナーの粘着力が大きくなり加圧ローラに巻き付く可能性がある。
In recent years, as ink jet printers become widespread, paper whose surface is coated for ink jet is sold alongside conventional plain paper. The coated paper has a coating on the surface layer, but when used in an electrophotographic image forming apparatus, the coating film melts with heat in the fixing part, and due to the affinity with the fixing roller or fixing belt surface material, Jam occurs when it is wound around the fixing roller or the fixing belt.
In addition, for the purpose of reducing the amount of paper used from the viewpoint of environmental protection, there is an increasing number of cases where one-sided printing paper that has become unnecessary is reused as a backing paper. When a large amount of toner such as a color photographic image is used for the image on the backing paper, there is a possibility that the adhesive force of the toner melted in the fixing unit becomes large and the toner is wound around the pressure roller.

また、組成や材料が異なるトナーを使用している他社製画像形成装置でコピーされた紙を裏紙として使用するケースも考えられる。この場合、使用されたトナーと定着ローラまたは定着ベルト表面素材との親和性が不明であり、分離性は保証されないため定着部での巻き付きが発生する可能性がある。
以上のように使用する紙の種類には様々な制約があり、「インクジェット用紙は使用しないで下さい」等のデカル表示やマニュアル等の警告も行われているものの気付かない、もしくは全く留意しないユーザもいる。このような原因で定着部において巻き付きが発生した場合、分離爪や分離板などの食込みによる定着ユニットが破損し、またジャム紙除去が困難になるという問題がある。
Further, a case where paper copied by an image forming apparatus manufactured by another company using toners having different compositions and materials is used as a backing paper is also conceivable. In this case, the affinity between the used toner and the fixing roller or the surface material of the fixing belt is unknown, and the separability is not guaranteed.
As described above, there are various restrictions on the type of paper used, and some users do not notice or do not pay attention at all even though a decal display such as “Please do not use inkjet paper” or a warning such as a manual is given. Yes. When the wrapping occurs in the fixing unit due to such a cause, there is a problem that the fixing unit is damaged due to the biting of the separation claw or the separation plate and it is difficult to remove the jammed paper.

上記のジャム紙除去が困難であるという問題に対し、特許文献1では、定着装置内のジャム検知手段がシート(紙)ジャムを検知した場合には、定着ローラ及び加圧ローラを逆回転させて、紙を定着部の上流側へ戻すことでジャム紙の除去性を改善した定着装置を提供している。
また、特許文献2では、記録シート(紙)を一部加熱し、軟化するか否かで定着ローラへの巻き付きの可否を判断する記録シート判断手段と、記録シートの搬送を制御する制御装置を設け、記録シート判断手段により記録シートが定着ローラに巻き付くと判断される場合は、搬送制御装置により記録シートを加熱状態の定着装置に搬送しないように制御することによりインクジェット用紙による巻き付きを防止する画像形成装置を提供している。
特開2000−352890公報 特開2003−262995公報
With respect to the problem that it is difficult to remove the jammed paper, in Patent Document 1, when the jam detecting means in the fixing device detects a sheet (paper) jam, the fixing roller and the pressure roller are rotated in the reverse direction. The present invention provides a fixing device that improves the removability of jammed paper by returning the paper to the upstream side of the fixing unit.
Further, in Patent Document 2, a recording sheet determination unit that determines whether or not the recording sheet (paper) is partially heated and softened, and a control device that controls conveyance of the recording sheet. When the recording sheet judging means determines that the recording sheet is wound around the fixing roller, the conveyance control device controls the recording sheet not to be conveyed to the heated fixing device, thereby preventing the ink jet paper from being wound. An image forming apparatus is provided.
JP 2000-352890 A JP 2003-26295 A

しかし、特許文献1の場合は、既にトナー像が紙上に転写されているため、トナーが無駄になりコスト面で不利である。また、トナー像が定着される前に紙は定着部上流側に戻されるため、トナーの飛散が懸念される。更に、ユーザがジャム紙除去作業を行う際にトナーを触ったり吸い込んだりする危険性があり、健康面での弊害が懸念される。
また、特許文献2の場合は、軟化層と定着ローラ表面との親和性や表面性の問題が関係するため、軟化することにより必ず定着ローラに巻き付くとは言えず、従って本来は巻き付かない紙も巻き付く可能性有りと判断している可能性がある。また、裏紙では検知範囲外にトナーが存在した場合に検知できない可能性がある。また、定着ローラまたは定着ベルトもしくは加圧ローラに巻き付かない裏紙であっても、検知箇所にトナーが存在して溶融を検知した場合は誤判定してしまうため、正しく巻き付くか否かを判別することができない。更に、単位時間当りのコピー枚数が増えるに従って紙の搬送速度が大きくなるが、この場合に巻き付きの判断・制御するには反応速度が早く、精度の高いセンサが必要であるためコストが増大してしまう。
本発明は、定着ローラまたは定着ベルトに巻き付く紙が定着ユニットへ進入するのを防ぐことができる画像形成装置を提供することを目的とする。
However, in the case of Patent Document 1, since the toner image has already been transferred onto the paper, the toner is wasted, which is disadvantageous in terms of cost. Further, since the paper is returned to the upstream side of the fixing unit before the toner image is fixed, there is a concern about the scattering of the toner. Furthermore, there is a risk that the user touches or inhales the toner when performing the jam paper removing operation, and there is a concern about adverse health effects.
Further, in the case of Patent Document 2, since there is a problem of affinity between the softened layer and the surface of the fixing roller and surface properties, it cannot be said that the softening does not necessarily wrap around the fixing roller, and therefore the original does not wind. There is a possibility that it is judged that there is a possibility that the paper is also wound. In addition, the back paper may not be detected when toner is present outside the detection range. Even if the backing paper does not wind around the fixing roller, the fixing belt, or the pressure roller, if the toner is present at the detection location and melting is detected, an erroneous determination is made. It cannot be determined. Furthermore, the paper transport speed increases as the number of copies per unit time increases. In this case, however, the speed of reaction is high to determine and control the winding, and a highly accurate sensor is required, which increases the cost. End up.
An object of the present invention is to provide an image forming apparatus that can prevent paper wound around a fixing roller or a fixing belt from entering a fixing unit.

上記目的を達成するために、請求項1記載の発明は、給紙部から給紙ローラにより給紙された転写材を、レジストローラ対、感光体と転写手段とを備えた画像形成部、定着ローラ又は定着ベルト及び加圧ローラを備えた定着装置に順次通過させる構成を備えた画像形成装置において、表面材質が定着ローラ又は定着ベルトの表面材質と同じ材質で構成される転写材搬送ローラと、表面材質が加圧ローラと同じ表面材質で構成される他の転写材搬送ローラとからなる転写材搬送ローラ対がレジストニップと転写ニップとの間の搬送経路上に配置されており、かつ、前記転写材搬送ローラを加熱する加熱手段と、前記転写材搬送ローラと転写ニップとの間に配置され転写材の通過を検知する転写材通過検知手段と、を有し、所定の時間内に前記転写材通過検知手段が転写材の通過を検知しなかった場合は、前記転写搬送ローラが転写材を巻き取ったと判断して該転写材搬送ローラ及び転写材搬送方向に対し前記転写材搬送ローラより上流に位置するローラの駆動を停止または反転する制御を行うコントローラを有することを特徴とする。 In order to achieve the above object, according to the first aspect of the present invention, a transfer material fed from a paper feed unit by a paper feed roller is transferred to a registration roller pair, an image forming unit including a photoconductor and a transfer unit, and a fixing unit. A transfer material conveying roller having a surface material made of the same material as the surface material of the fixing roller or the fixing belt; surface material is arranged on the transport path between the transfer material conveying roller pair registration nip and the transfer nip formed of the other of the transfer material conveying roller composed of the same surface material as the pressure roller, and the a heating means for heating the transfer material conveying roller, and a transfer material passage detecting means for detecting passage of the deployed transfer material between the transfer nip and the transfer material conveying rollers, the rolling within a predetermined time If the material passage detection unit does not detect the passage of the transfer material, the transfer material roller determines that the transfer material roller has wound up the transfer material and is upstream of the transfer material conveyance roller with respect to the transfer material conveyance roller and the transfer material conveyance direction. characterized by a drive roller positioned to have a controller that performs a stop or reverse control to.

請求項2記載の発明は、請求項1記載の画像形成装置において、前記転写材搬送ローラより上流に位置する前記ローラは、前記給紙ローラ及び前記レジストローラ対であることを特徴とする。
請求項3記載の発明は、請求項1または2記載の画像形成装置において、転写材搬送ローラの表面温度を検知する表面温度検知手段を有しており、コントローラは、定着ローラまたは定着ベルトまたは加圧ローラの設定温度に基づいて、転写材搬送ローラの表面温度を制御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 roller positioned upstream of the transfer material conveying roller is the pair of the paper feed roller and the registration roller .
According to a third aspect of the present invention, in the image forming apparatus according to the first or second aspect, the image forming apparatus further comprises surface temperature detecting means for detecting the surface temperature of the transfer material conveying roller, and the controller is a fixing roller, a fixing belt, or an additive. based on the set temperature of the pressure roller, and controlling the surface temperature of the transfer material conveyance roller.

本発明の画像形成装置は、表面が定着ローラまたは定着ベルトと同じ表面素材で構成される転写材搬送ローラと、表面が加圧ローラと同じ表面素材で構成される転写材搬送ローラとからなる一対の転写材搬送ローラが搬送経路上でレジストニップと転写ニップの間に配置されており、かつ、転写材搬送ローラを加熱する加熱手段と、転写材搬送ローラと転写ニップとの間に配置され、転写材の通過を検知する転写材通過検知手段とを有するので、定着ローラまたは定着ベルトに巻き付く紙が定着ユニットへ進入するのを防ぐことができる。   The image forming apparatus of the present invention includes a pair of transfer material conveyance rollers having a surface made of the same surface material as the fixing roller or the fixing belt, and a transfer material conveyance roller having a surface made of the same surface material as the pressure roller. The transfer material transport roller is disposed between the registration nip and the transfer nip on the transport path, and is disposed between the transfer material transport roller and the transfer nip, and heating means for heating the transfer material transport roller, Since the transfer material passage detecting means for detecting the passage of the transfer material is provided, it is possible to prevent the paper wound around the fixing roller or the fixing belt from entering the fixing unit.

以下、本発明の実施の形態を図面に従って説明する。
図1は本発明の実施の形態に係る画像形成装置の構成図である。図3に示す従来の画像形成装置と同一箇所には同一符号を付し、重複する説明は省略する。
本実施の形態の画像形成装置は、感光体5、帯電ユニット6、書き込みユニット7、現像ユニット8、転写ローラ(転写手段)9、クリーニングユニット10から成る画像形成部を有している。また、定着ローラ11と加圧ローラ12は、定着装置を構成し、両ローラ間には定着ニップCが形成されている。
転写位置に転写材を給紙するレジストローラ対3のレジストニップAと、感光体5と転写ローラ9との転写ニップBとの間の搬送経路には、転写材(紙)搬送ローラ51、52が設置されている。そして、転写材搬送ローラ51、52で巻き取りニップDが形成されている。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of an image forming apparatus according to an embodiment of the present invention. The same parts as those of the conventional image forming apparatus shown in FIG.
The image forming apparatus according to the present embodiment includes an image forming unit including a photoconductor 5, a charging unit 6, a writing unit 7, a developing unit 8, a transfer roller (transfer unit) 9, and a cleaning unit 10. The fixing roller 11 and the pressure roller 12 constitute a fixing device, and a fixing nip C is formed between the two rollers.
Transfer material (paper) conveyance rollers 51 and 52 are provided on a conveyance path between the registration nip A of the registration roller pair 3 that feeds the transfer material to the transfer position and the transfer nip B between the photosensitive member 5 and the transfer roller 9. Is installed. A winding nip D is formed by the transfer material transport rollers 51 and 52.

転写材搬送ローラ51の表面材質は定着ローラ11の表面材質と同じPFAで構成されている。また、転写材搬送ローラ52の表面材質は加圧ローラ12の表面材質と同じPFAで構成されている。なお、定着ローラ11及び加圧ローラ12、転写材搬送ローラ51及び転写材搬送ローラ52の表面材質はPFAの他にシリコンゴムやテフロン(登録商標)系素材、フッ素系素材で構成されていても良い。
転写材搬送ローラ51は、内部のレジストヒータ53及び当接されたレジストサーミスタ54により、定着サーミスタ14から得られた定着ローラ11の表面温度に基づいた温度に制御されている。なお定着ローラ11と同様に、加圧ローラ12に対してもヒータ及びサーミスタを配置し、制御を行っても良い。搬送経路上の巻き取りニップDと転写ニップBとの間に紙の通過を検知する反射型光センサ55が配置されている。
The surface material of the transfer material conveying roller 51 is composed of the same PFA as the surface material of the fixing roller 11. Further, the surface material of the transfer material transport roller 52 is made of the same PFA as the surface material of the pressure roller 12. The surface material of the fixing roller 11 and the pressure roller 12, the transfer material transport roller 51 and the transfer material transport roller 52 may be made of silicon rubber, Teflon (registered trademark) material, or fluorine material in addition to PFA. good.
The transfer material transport roller 51 is controlled to a temperature based on the surface temperature of the fixing roller 11 obtained from the fixing thermistor 14 by an internal resist heater 53 and a resist thermistor 54 in contact therewith. Similar to the fixing roller 11, a heater and a thermistor may be disposed on the pressure roller 12 for control. Between the take-up nip D and the transfer nip B on the transport path, a reflective optical sensor 55 that detects the passage of paper is disposed.

このように本発明は、給紙部1から給紙された転写材Pを、レジストローラ対3、感光体5と転写手段9とを備えた画像形成部、定着ローラ又は定着ベルト及び加圧ローラを備えた定着装置に順次通過させる構成を備えた画像形成装置において、
表面材質が定着ローラ11(又は定着ベルト)の表面材質と同じ材質で構成される転写材搬送ローラ51と、表面材質が加圧ローラ12と同じ表面材質で構成される他の転写材搬送ローラ52とからなる転写材搬送ローラ対がレジストニップと転写ニップとの間の搬送経路上に配置されており、かつ、転写材搬送ローラを加熱する加熱手段53と、転写材搬送ローラと転写ニップとの間に配置され転写材の通過を検知する転写材通過検知手段55と、を有した構成が特徴的である。
As described above, according to the present invention, the transfer material P fed from the paper feeding unit 1 is transferred to the image forming unit, the fixing roller or the fixing belt, and the pressure roller including the registration roller pair 3, the photosensitive member 5, and the transfer unit 9. In an image forming apparatus having a configuration for sequentially passing through a fixing device including
The transfer material conveyance roller 51 whose surface material is made of the same material as that of the fixing roller 11 (or fixing belt), and another transfer material conveyance roller 52 whose surface material is made of the same surface material as that of the pressure roller 12. A transfer material conveyance roller pair comprising: a heating means 53 for heating the transfer material conveyance roller; and a transfer material conveyance roller and a transfer nip. A structure having a transfer material passage detecting means 55 disposed between them and detecting the passage of the transfer material is characteristic.

次に定着ローラ11に巻き付く紙を通紙した場合の例を挙げる。紙(転写材)Pが給紙トレイ1から給紙ローラ2によって搬送されてレジストニップAを通過し、巻き取りニップDを通過する。この時、転写材搬送ローラ51は定着ローラ11と同じ表面素材、温度であるため、紙Pが定着ローラ11に巻き付くなら転写材搬送ローラ51でも事前に巻き取ることができる。   Next, an example in which the paper wound around the fixing roller 11 is passed will be described. The paper (transfer material) P is conveyed from the paper feed tray 1 by the paper feed roller 2, passes through the registration nip A, and passes through the take-up nip D. At this time, since the transfer material conveyance roller 51 has the same surface material and temperature as the fixing roller 11, if the paper P is wound around the fixing roller 11, the transfer material conveyance roller 51 can be wound in advance.

図2は本発明の実施の形態に係る画像形成装置の制御フローチャートである。紙Pが転写材搬送ローラ51に巻き取られた場合、紙Pは反射型光センサ55を通過しないため、紙Pが給紙されてから反射型光センサ55を通過するまでの正常な時間(規定時間)を超えた時(S1、S2でN、S3でN)、コントローラ15は巻き取りニップDで紙が巻き取られたと判断し、給紙ローラ2とレジストローラ3及び転写材搬送ローラ51、52の駆動を反転する制御を行い(S4)、転写材搬送ローラ51、52が巻き取った紙Pを給紙トレイ1に収納する。
また、定着ローラ11に巻き付かない紙Pを通紙した場合は、紙Pは巻き取りニップDを通過後に反射型光センサ55を通過するため(S2でY)、コントローラ15は巻き取りニップDで紙が巻き取られなかったと判断し、給紙ローラ2とレジストローラ3及び転写材搬送ローラ51、52の駆動を反転せずに正常に画像が形成される(S5)。
なお、定着ローラ11と同様に加圧ローラ12に対してもヒータ及びサーミスタを、転写材搬送ローラ51と同様に転写材搬送ローラ52に対してもヒータ及びサーミスタを配置し、同等の制御を行うこともできる。
FIG. 2 is a control flowchart of the image forming apparatus according to the embodiment of the present invention. When the paper P is wound around the transfer material conveying roller 51, the paper P does not pass through the reflective optical sensor 55, and therefore, a normal time from when the paper P is fed until it passes through the reflective optical sensor 55 ( When the specified time is exceeded (N in S1, S2, N in S3), the controller 15 determines that the paper has been taken up at the take-up nip D, and the paper feed roller 2, the registration roller 3, and the transfer material transport roller 51 , 52 is reversed (S4), and the paper P wound up by the transfer material transport rollers 51, 52 is stored in the paper feed tray 1.
Further, when the paper P that is not wound around the fixing roller 11 is passed, the paper P passes through the reflection type optical sensor 55 after passing through the take-up nip D (Y in S2). In step S5, it is determined that the paper has not been wound up, and the drive of the paper feed roller 2, the registration roller 3, and the transfer material transport rollers 51 and 52 is not reversed (S5).
Similar to the fixing roller 11, a heater and thermistor are arranged for the pressure roller 12, and a heater and thermistor are arranged for the transfer material conveyance roller 52 as well as the transfer material conveyance roller 51. You can also.

次に加圧ローラ12に巻き付く裏紙を通紙した場合の例を挙げる。紙Pが給紙トレイ1から給紙ローラ2によって搬送されてレジストニップAを通過し、巻き取りニップDを通過する。この時、転写材搬送ローラ52は加圧ローラ12と同じ表面素材、温度であるため、紙Pが加圧ローラ12に巻き付くなら転写材搬送ローラ52でも事前に巻き取ることができる。
転写材搬送ローラ52によって巻き取られた場合、紙Pは反射型光センサ55を通過しないため、紙が給紙されてから反射型光センサ55を通過するまでの正常な時間を超えた時、コントローラ15は巻き取りニップDで紙が巻き取られたと判断し、給紙ローラ2とレジストローラ3及び転写材搬送ローラ51、52の駆動を反転する制御を図3の制御フローのように行い、転写材搬送ローラ51、52が巻き取った紙Pを給紙トレイ1に収納する。
Next, an example in which a backing paper wound around the pressure roller 12 is passed will be described. The paper P is conveyed from the paper feed tray 1 by the paper feed roller 2, passes through the registration nip A, and passes through the take-up nip D. At this time, since the transfer material conveyance roller 52 has the same surface material and temperature as the pressure roller 12, if the paper P is wound around the pressure roller 12, the transfer material conveyance roller 52 can be wound in advance.
When the paper P is taken up by the transfer material conveyance roller 52, the paper P does not pass through the reflection type optical sensor 55. Therefore, when the normal time from when the paper is fed until it passes through the reflection type optical sensor 55 is exceeded, The controller 15 determines that the paper has been taken up at the take-up nip D, and performs control to reverse the driving of the paper feed roller 2, the registration roller 3, and the transfer material transport rollers 51 and 52 as shown in the control flow of FIG. The paper P wound up by the transfer material transport rollers 51 and 52 is stored in the paper feed tray 1.

本発明の実施の形態に係る画像形成装置の構成図である。1 is a configuration diagram of an image forming apparatus according to an embodiment of the present invention. 本発明の実施の形態に係る画像形成装置の制御フローチャートである。3 is a control flowchart of the image forming apparatus according to the embodiment of the present invention. 従来例に係る画像形成装置の構成図である。It is a block diagram of the image forming apparatus which concerns on a prior art example.

符号の説明Explanation of symbols

11 定着ローラ
12 加圧ローラ
15 コントローラ
51 転写材搬送ローラ
52 転写材搬送ローラ
53 レジストヒータ(加熱手段)
55 反射型光センサ(転写材通過検知手段)
A レジストニップ
B 転写ニップ
DESCRIPTION OF SYMBOLS 11 Fixing roller 12 Pressure roller 15 Controller 51 Transfer material conveyance roller 52 Transfer material conveyance roller 53 Resist heater (heating means)
55 Reflection type optical sensor (transfer material passage detection means)
A Registration nip B Transfer nip

Claims (3)

給紙部から給紙ローラにより給紙された転写材を、レジストローラ対、感光体と転写手段とを備えた画像形成部、定着ローラ又は定着ベルト及び加圧ローラを備えた定着装置に順次通過させる構成を備えた画像形成装置において、
表面材質が定着ローラ又は定着ベルトの表面材質と同じ材質で構成される転写材搬送ローラと、表面材質が加圧ローラと同じ表面材質で構成される他の転写材搬送ローラとからなる転写材搬送ローラ対がレジストニップと転写ニップとの間の搬送経路上に配置されており、かつ、前記転写材搬送ローラを加熱する加熱手段と、前記転写材搬送ローラと転写ニップとの間に配置され転写材の通過を検知する転写材通過検知手段と、を有し、所定の時間内に前記転写材通過検知手段が転写材の通過を検知しなかった場合は、前記転写搬送ローラが転写材を巻き取ったと判断して該転写材搬送ローラ、及び転写材搬送方向に対し前記転写材搬送ローラより上流に位置するローラの駆動を停止または反転する制御を行うコントローラを有することを特徴とする画像形成装置。
The transfer material fed from the paper feed unit by the paper feed roller sequentially passes through a registration roller pair, an image forming unit including a photoconductor and a transfer unit, a fixing roller or a fixing belt including a fixing belt and a pressure roller. In an image forming apparatus having a configuration for
Transfer material conveyance comprising a transfer material conveyance roller whose surface material is made of the same material as that of the fixing roller or the fixing belt, and another transfer material conveyance roller whose surface material is made of the same surface material as that of the pressure roller. rollers are disposed on the transport path between the transfer nip and the registration nip and heating means for heating the transfer material conveying rollers, arranged between the transfer nip and the transfer material conveying roller transfer A transfer material passage detection means for detecting the passage of the material, and if the transfer material passage detection means does not detect the passage of the transfer material within a predetermined time, the transfer conveyance roller winds the transfer material. Japanese to chromatic transfer material conveying roller to determine, and the controller for stopping or reversing controls the driving of the rollers positioned from upstream the transfer material conveyance roller with respect to the transfer material conveying direction and took An image forming apparatus.
前記転写材搬送ローラより上流に位置する前記ローラは、前記給紙ローラ及び前記レジストローラ対であることを特徴とする請求項1記載の画像形成装置。 The image forming apparatus according to claim 1 , wherein the roller positioned upstream of the transfer material conveying roller is the pair of the paper feeding roller and the registration roller . 前記転写材搬送ローラの表面温度を検知する表面温度検知手段を有しており、前記コントローラは、前記定着ローラまたは前記定着ベルトまたは前記加圧ローラの設定温度に基づいて、前記転写材搬送ローラの表面温度を制御することを特徴とする請求項1または2記載の画像形成装置。 Has a surface temperature detecting means for detecting the surface temperature of the transfer material conveying roller, wherein the controller, the fixing roller or on the basis of the set temperature of the fixing belt or the pressure roller, the transfer material conveyance roller the image forming apparatus according to claim 1 or 2, wherein the controlling the surface temperature.
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