JP2002244496A - Image forming device - Google Patents
Image forming deviceInfo
- Publication number
- JP2002244496A JP2002244496A JP2001043814A JP2001043814A JP2002244496A JP 2002244496 A JP2002244496 A JP 2002244496A JP 2001043814 A JP2001043814 A JP 2001043814A JP 2001043814 A JP2001043814 A JP 2001043814A JP 2002244496 A JP2002244496 A JP 2002244496A
- Authority
- JP
- Japan
- Prior art keywords
- transfer material
- image forming
- image
- forming apparatus
- fixing
- 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.)
- Withdrawn
Links
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- Control Or Security For Electrophotography (AREA)
- Fixing For Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、感光体表面に形成
したトナー像を転写材に転写す転写工程とトナーを転写
材に定着させる定着工程を経て画像を形成する画像形成
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus for forming an image through a transfer step of transferring a toner image formed on a photoreceptor surface to a transfer material and a fixing step of fixing toner to the transfer material.
【０００２】[0002]
【従来の技術】従来、複写機やレーザービームプリンタ
等に用いられる画像形成装置としては、図８及び図９に
示すものが知られている。2. Description of the Related Art Conventionally, as an image forming apparatus used in a copying machine, a laser beam printer, and the like, those shown in FIGS. 8 and 9 are known.
【０００３】図８に示す画像形成装置の概略を説明する
と、図中、１は感光体であり、不図示の帯電装置と画像
書き込み装置及び現像装置によって感光体１上に形成さ
れたトナー画像は、転写帯電器１０で転写材３０上に静
電転写され、転写材３０は分離帯電器２０で静電分離さ
れた後、搬送部２によって搬送され、定着入口ガイド３
を経て定着部に送られ、該転写材３０上に形成された未
定着画像は定着部で加熱及び加圧によって定着されて最
終画像が形成される。[0003] The outline of the image forming apparatus shown in FIG. 8 will be described. In the figure, reference numeral 1 denotes a photoreceptor, and a toner image formed on the photoreceptor 1 by a charging device, an image writing device, and a developing device (not shown). The transfer material 30 is electrostatically transferred onto the transfer material 30 by the transfer charger 10, and the transfer material 30 is electrostatically separated by the separation charger 20, and is then conveyed by the conveyance unit 2 to the fixing entrance guide 3.
The unfixed image formed on the transfer material 30 is fixed by heat and pressure in the fixing unit to form a final image.
【０００４】ここで、定着部に関して詳述する。Here, the fixing unit will be described in detail.
【０００５】４はＡｌ等の金属上にフッ素系の離型層が
被覆された定着ローラであり、その中央の空洞部にはハ
ロゲンヒータ等の加熱装置が配されている。Reference numeral 4 denotes a fixing roller in which a fluorine-based release layer is coated on a metal such as Al, and a heating device such as a halogen heater is disposed in a central hollow portion thereof.
【０００６】一方、５は加圧ローラであって、これはＳ
ＵＳ等の金属上にＳｉゴム等の弾性層を被覆し、最外層
にＰＦＡチューブ等の離型層を被覆して構成されてい
る。On the other hand, 5 is a pressure roller, which is
An elastic layer such as Si rubber is coated on a metal such as US, and a release layer such as a PFA tube is coated on the outermost layer.
【０００７】而して、上記一対のローラ４，５は不図示
の駆動装置によって互いに圧接された状態で回転駆動さ
れ、両ローラ４，５のニップ部に転写材３０を通過させ
ることによって未定着トナー画像を加熱及び加圧して転
写材３０上にトナー画像を定着させる。The pair of rollers 4 and 5 are rotated by a driving device (not shown) in a state where they are pressed against each other, and are not fixed by passing the transfer material 30 through the nip portion between the rollers 4 and 5. The toner image is fixed on the transfer material 30 by heating and pressing the toner image.
【０００８】ここで、加圧方式について説明する。Here, the pressurizing method will be described.
【０００９】１５は加圧アームであり、この加圧アーム
１５は一端が回動中心１５ａになり、他端が加圧ばね６
と加圧ビス８及び固定板金９によって加圧ローラ５を定
着ローラ４に加圧する。詳細には、加圧ローラ５の端部
の軸部を加圧アーム５の片側を定着部の枠体に接続され
た不図示の固定板金と、加圧アーム１５の片側にねじ込
まれた加圧ビス８の間に加圧ばね６を介装することによ
って加圧力を得る構成が採用されている。本方式では、
加圧ビス８の回転によって加圧ばね６の長さを可変させ
て加圧力を適宜変化させる。尚、加圧手段は手前側と奥
側にそれぞれ配されており、基本的に左右を均一に調整
するよう構成されている。Reference numeral 15 denotes a pressure arm. One end of the pressure arm 15 is a rotation center 15a, and the other end is a pressure spring 6.
The pressure roller 5 is pressed against the fixing roller 4 by the pressure screw 8 and the fixed sheet metal 9. More specifically, the shaft at the end of the pressure roller 5 is connected to a fixing sheet metal (not shown) in which one side of the pressure arm 5 is connected to the frame of the fixing unit, and the pressure screwed into one side of the pressure arm 15. A configuration in which a pressing force is obtained by interposing a pressure spring 6 between the screws 8 is employed. In this method,
The length of the pressure spring 6 is varied by the rotation of the pressure screw 8 to appropriately change the pressing force. The pressurizing means are arranged on the near side and the far side, respectively, and are configured to basically adjust the right and left uniformly.
【００１０】次に、図９に示す画像形成装置の概略を説
明する。Next, an outline of the image forming apparatus shown in FIG. 9 will be described.
【００１１】図９において、１ａ〜１ｄは感光体であ
り、不図示の帯電装置と画像書き込み装置及び現像装置
によって感光体１ａ〜１ｄ上に形成されたトナー画像
は、転写ブレード１１で転写材３０上に電界転写され、
転写材３０は搬送部２で搬送され、定着入口ガイド３を
経て定着部に送られ、該転写材３０上に形成された未定
着画像は定着部で加熱及び加圧によって定着されて最終
画像が形成される。In FIG. 9, reference numerals 1a to 1d denote photosensitive members, and a toner image formed on the photosensitive members 1a to 1d by a charging device (not shown), an image writing device, and a developing device is transferred by a transfer blade 11 to a transfer material 30. The electric field is transferred onto
The transfer material 30 is conveyed by the conveyance unit 2 and sent to the fixing unit via the fixing entrance guide 3, and the unfixed image formed on the transfer material 30 is fixed by heating and pressing in the fixing unit, and the final image is formed. It is formed.
【００１２】而して、この画像形成装置においては、感
光体１ａ〜１ｄではそれぞれイエロー、マゼンタ、シア
ン、ブラックのトナー画像が形成され、これらのトナー
画像は順次転写材上に重ねられ、定着部で加熱混色させ
ることによってフルカラー画像が形成される。Thus, in this image forming apparatus, yellow, magenta, cyan, and black toner images are formed on the photoconductors 1a to 1d, respectively, and these toner images are sequentially superimposed on the transfer material, and are fixed. To form a full-color image.
【００１３】このような画像形成装置においては、特に
限られたスペースに、４つの感光体１ａ〜１ｄ、定着部
等を配するため、最終の感光体１ｄと定着部の距離が極
端に短くなっている。ここで、定着部に関しては基本的
には図８に示した前記定着部と同一であるが、定着ロー
ラ４としてＡ１等の金属上にシリコンゴム層を被覆した
上にフッ素系の離型層が被覆されたものを使用する場合
が多い。In such an image forming apparatus, since the four photoconductors 1a to 1d, the fixing unit, and the like are arranged in a limited space, the distance between the final photoconductor 1d and the fixing unit becomes extremely short. ing. Here, the fixing unit is basically the same as the fixing unit shown in FIG. 8, except that a silicon rubber layer is coated on a metal such as A1 as the fixing roller 4 and a fluorine-based release layer is formed. In many cases, a coated product is used.
【００１４】更に、１２は廃熱用のファンであり、この
ファン１２は一般的に画像形成装置の奥側側板に取り付
けられ、画像形成装置内に溜まった熱気を排出する。Reference numeral 12 denotes a waste heat fan. The fan 12 is generally mounted on a rear side plate of the image forming apparatus, and discharges hot air accumulated in the image forming apparatus.
【００１５】[0015]
【発明が解決しようとする課題】以上説明した従来の画
像形成装置においては、種々の要因により、転写材が定
着部の挟圧部内に直角に進入しない場合があり、結果と
して、搬送部上での進行方向と進行方向がずれるため、
主に長尺の転写材を搬送した場合、転写材にストレスが
加わり、紙しわ、挟圧部直前で片側にループが過多にで
き、挟圧部前で一部の未定着画像がローラに接触して未
定着画像を乱す等の問題があった。特に、図９に示した
画像形成装置においては、最終感光ドラム１ｄと定着部
の距離が極端に短くなっているため、以上の問題が顕著
に現れる傾向があった。In the conventional image forming apparatus described above, the transfer material may not enter the pressing portion of the fixing portion at a right angle due to various factors. Because the traveling direction and the traveling direction of
When a long transfer material is mainly conveyed, stress is applied to the transfer material, paper wrinkles, excessive loops on one side immediately before the pressure portion, and some unfixed images contact the roller before the pressure portion. As a result, the unfixed image is disturbed. In particular, in the image forming apparatus shown in FIG. 9, since the distance between the final photosensitive drum 1d and the fixing unit is extremely short, the above-mentioned problem tends to appear remarkably.
【００１６】以上の問題点に関して検討を行ったとこ
ろ、本問題の要因は以下のような事項に起因することが
判明した。After examining the above problems, it was found that the cause of this problem was as follows.
【００１７】即ち、定着部の挟圧部に転写材が斜行して
進入するで要因としては、 ・転写材の直進方向に対して搬送部が中に斜行が生じ、
転写材が定着挟圧部に斜めに進入する。 ・搬送部に対して定着ローラ対で形成される挟圧部の軸
方向がずれているために転写材が定着挟圧部に斜めに進
入する。 等が主要因であることが判明している。In other words, the transfer material enters the clamping portion of the fixing portion obliquely and enters the fixing portion. The factors are as follows.
The transfer material obliquely enters the fixing nip portion. The transfer material obliquely enters the fixing nip portion because the axial direction of the nip portion formed by the pair of fixing rollers is shifted with respect to the transport portion. Have been found to be the main factors.
【００１８】これらの問題点／要因の対策としては以下
のことが非常に効果的であることが判明した。As a countermeasure against these problems / factors, the following has been found to be very effective.
【００１９】即ち、第１に挟圧部内での斜行量を正確に
測定する方式を確立する。これは、実際に転写材を搬送
させ、斜行量を測定することが必要である。具体的に
は、 ・転写材上にべた画像を形成し、挟圧部内において転写
材の前端部で一定時間停止滞留後、排出させて転写材上
に形成される光沢変化（挟圧部の跡）の転写材の先端部
からの前端停止部の距離の手前側と奥側の差を測定する
方法等が効果的である。That is, first, a method for accurately measuring the amount of skew in the clamping portion is established. For this, it is necessary to actually transport the transfer material and measure the skew amount. Specifically, a solid image is formed on the transfer material, and after stopping and staying at the front end portion of the transfer material for a predetermined time in the squeezing portion, the gloss is changed on the transfer material by discharging (the trace of the squeezing portion) The method of measuring the difference between the front side and the back side of the distance of the front end stop from the front end of the transfer material is effective.
【００２０】・又、上記搬送部と定着部の間の長手軸方
向、用紙手前側と奥側の用紙通紙領域内に、先端部の通
過を検知できる検出手段を有し、転写材通過の先端通過
時間の手前側と奥側の差を測定することによって斜行量
を測定する等の方法も効果的である。A detecting means for detecting the passage of the leading end in the longitudinal direction of the paper between the conveying section and the fixing section, in the paper passing areas on the near side and the far side of the sheet; A method of measuring the amount of skew by measuring the difference between the front side transit time and the front side transit side is also effective.
【００２１】第２には、第１の方法で正確に測定した斜
行量を、互いに圧接して回転する一対のローラの軸方向
と搬送部の平行度をローラ対の軸方向又は搬送部の軸方
向を調整することが考えられる。Second, the skew amount accurately measured by the first method is used to determine the axial direction of a pair of rollers rotating by pressing against each other and the parallelism of the conveying unit or the axial direction of the roller pair or the conveying unit. Adjusting the axial direction is conceivable.
【００２２】本発明は上記事情に鑑みてなされたもの
で、その目的とする処は、斜行に起因する転写材のしわ
や未定着画像の乱れ等を防いで高質画像を安定して形成
することができる画像形成装置を提供することにある。The present invention has been made in view of the above circumstances, and a purpose thereof is to stably form a high-quality image by preventing wrinkles of a transfer material and disturbance of an unfixed image due to skew. It is an object of the present invention to provide an image forming apparatus capable of performing the above.
【００２３】[0023]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、像担持体上に可視のトナー像を形成する
画像形成部と、前記トナー像を転写材上に転写する転写
部と、転写材を搬送するための搬送部と、転写材上の未
定着トナー像を定着するための定着部を備え、定着部が
互いに圧接状態で回転する一対のローラと少なくとも片
側のローラの内側に熱源を有し、ローラ間の挟圧部にお
いて未定着トナー画像を加熱及び加圧してこれを転写材
に定着させる画像形成装置において、前記転写材が前記
挟圧部内に進入するときの斜行量を測定するモードを設
けたことを特徴とする。To achieve the above object, the present invention provides an image forming section for forming a visible toner image on an image carrier, and a transfer section for transferring the toner image onto a transfer material. A transport unit for transporting the transfer material, and a fixing unit for fixing an unfixed toner image on the transfer material, wherein the fixing unit is disposed inside a pair of rollers and at least one roller that rotate in pressure contact with each other. In an image forming apparatus that has a heat source and heats and presses an unfixed toner image at a nip portion between rollers to fix the unfixed toner image to a transfer material, an amount of skew when the transfer material enters the nip portion Is provided in a mode for measuring.
【００２４】[0024]
【発明の実施の形態】以下に本発明の実施の形態を添付
図面に基づいて説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００２５】＜実施の形態１＞本実施の形態は、転写材
上にべた画像を形成し、定着装置の挟圧部内において転
写材の先端部等で転写材を一定時間停止滞留後に排出
し、転写材上に形成される光沢変化（挟圧部の跡）の転
写材の先端部からの後端停止部の距離の手前側と奥側の
差を測定した後、搬送部下流側の軸線と定着挟圧部の軸
線のなす角を、搬送部下流側の軸線を適宜調整すること
によって設定することを特徴とする。<Embodiment 1> In the present embodiment, a solid image is formed on a transfer material, and the transfer material is discharged after stopping and staying at a leading end portion or the like of the transfer material for a predetermined time in a pressing portion of a fixing device. After measuring the difference in the distance between the front end and the rear end stop of the transfer material from the front end to the rear end of the change in gloss formed on the transfer material, The angle formed by the axis of the fixing nip portion is set by appropriately adjusting the axis on the downstream side of the transport unit.
【００２６】図１は本実施の形態に係る画像形成装置の
概略図であり、本画像形成装置の基本構成は図８に示し
た従来の画像形成装置のそれと同じである。FIG. 1 is a schematic diagram of an image forming apparatus according to the present embodiment. The basic configuration of the image forming apparatus is the same as that of the conventional image forming apparatus shown in FIG.
【００２７】本実施の形態に係る画像形成装置では、転
写材の挟圧部での斜行量を測定るモードを有している。
このモードを以下に詳述する。The image forming apparatus according to the present embodiment has a mode for measuring the amount of skew of the transfer material at the pressing portion.
This mode is described in detail below.
【００２８】感光体１上に形成されたべたトナー像を転
写帯電器１０で転写材３０上に静電転写した後、転写材
３０を分離帯電器２０で静電分離し、未定着トナー画像
が転写された転写材３０は搬送部２によって搬送され、
定着入口ガイド３を経て定着ローラ４と加圧ローラ５で
形成される挟圧部へ搬送される。After the solid toner image formed on the photoreceptor 1 is electrostatically transferred onto the transfer material 30 by the transfer charger 10, the transfer material 30 is electrostatically separated by the separation charger 20, and an unfixed toner image is formed. The transferred transfer material 30 is transported by the transport unit 2,
The sheet is conveyed to a clamping portion formed by the fixing roller 4 and the pressure roller 5 via the fixing entrance guide 3.
【００２９】ここで、転写材３０の略先端部に差し掛か
った時点で定着ローラ４と加圧ローラ５は一旦停止し、
数１０秒後に再度駆動されて転写材３０が排出される。
図２は本画像形成装置で形成された画像のモデル図であ
る。Here, the fixing roller 4 and the pressure roller 5 temporarily stop at the time when the transfer
After several tens of seconds, it is driven again and the transfer material 30 is discharged.
FIG. 2 is a model diagram of an image formed by the image forming apparatus.
【００３０】図２において、転写材３０の後端部付近の
長手軸方向に形成された光沢跡（挟圧部の跡）は、前記
モードで定着ローラ４と加圧ローラ５が停止した際に他
の部分よりべたトナーが非常に良く溶けるため、転写材
３０が挟圧部から排出された後、このような形の画像が
形成されている。ここで、Ｌ１は転写材３０の進行方向
に対して手前側の転写材３０先端から光沢跡までの距離
であり、Ｌ２は同様に奥側の転写材３０先端から光沢跡
までの距離であり、ΔＬはその差分であって、ΔＬ＝Ｌ
２−Ｌ１で定義される。即ち、ΔＬは転写材３０の挟圧
部に進行する以前のそれぞれ手前側と奥側の搬送速度差
に起因する搬送距離の差を意味し、このΔＬが正側に大
きくなる程、奥側の搬送速度が速いことを示す。In FIG. 2, gloss marks (traces of the pinching portions) formed in the longitudinal axis direction near the rear end of the transfer material 30 indicate when the fixing roller 4 and the pressure roller 5 stop in the above-described mode. Since the solid toner melts much better than the other portions, an image of such a shape is formed after the transfer material 30 is discharged from the clamping portion. Here, L1 is the distance from the tip of the transfer material 30 on the near side with respect to the traveling direction of the transfer material 30 to the gloss trace, L2 is the distance from the tip of the transfer material 30 on the back side to the gloss trace similarly, ΔL is the difference, ΔL = L
2-L1. That is, ΔL means a difference in transport distance caused by a difference in transport speed between the near side and the far side before proceeding to the pressing portion of the transfer material 30. As the ΔL increases toward the positive side, the far side increases. Indicates that the transport speed is high.
【００３１】以上のような方法でΔＬを測定することに
より、挟圧部内以前の転写材３０の斜行量を正確に測定
することが可能となる。By measuring ΔL by the above-described method, it is possible to accurately measure the amount of skew of the transfer material 30 before the nip portion.
【００３２】次に、以上測定した斜行量を調整及び制御
する方法について説明する。Next, a method for adjusting and controlling the skew amount measured as described above will be described.
【００３３】先ず第１には、画像形成装置の定期メンテ
ナンス時に前記モードで斜行量を測定し、搬送部下流側
の軸線と定着挟圧部の軸線のなす角をアクチュエータ７
０で調整する。First, during regular maintenance of the image forming apparatus, the amount of skew is measured in the above-described mode, and the angle between the axis of the downstream of the conveyance unit and the axis of the fixing and clamping unit is determined by the actuator 7.
Adjust with 0.
【００３４】図３においても同様に、先ず第１には、画
像形成装置の定期メンテナンス時に前記モードで斜行量
を測定し、搬送部下流側の軸線と定着挟圧の軸線のなす
角をアクチュエータ７０で調整する。Similarly, in FIG. 3, firstly, the amount of skew is measured in the above-mentioned mode during the regular maintenance of the image forming apparatus, and the angle between the axis of the conveyance section and the axis of the fixing nip pressure is determined by the actuator. Adjust with 70.
【００３５】ここで、図１を用いて本実施の形態におけ
る具体的な実施例について説明する。Here, a specific example of this embodiment will be described with reference to FIG.
【００３６】定着ローラ４はφ４０ｍｍの中空アルミ芯
金上に数１０μｍのフッ素コートを被覆して構成され、
加圧ローラ５はφ３０ｍｍのＳＵＳ芯金上に５ｍｍのシ
リコンゴムと５０μｍのＰＦＡチューブを被覆して構成
され、加熱用ヒータとしては７００Ｗのハロゲンヒータ
を使用した。ここで、定着ローラ４と加圧ローラ５を加
圧するための加圧ばね６としては略１０〜３０ｋｇまで
圧縮量に比例した反発力を示すコイルばねを使用した。The fixing roller 4 is formed by covering a hollow aluminum core of φ40 mm with a fluorine coat of several tens μm.
The pressure roller 5 is constituted by covering a 30 mm SUS core with a 5 mm silicon rubber and a 50 μm PFA tube, and using a 700 W halogen heater as a heater for heating. Here, as the pressure spring 6 for pressing the fixing roller 4 and the pressure roller 5, a coil spring exhibiting a repulsive force proportional to the compression amount up to approximately 10 to 30 kg was used.
【００３７】画像形成装置の定着挟圧部内の転写材の斜
行量の測定には、Ａ３サイズの白紙上にべたトナー画像
を形成し、転写材の後端５ｃｍの位置で約２０秒だけ転
写材を停止させ、その後、定着ローラと加圧ローラを再
駆動して転写材を排出させる。ここで、前述のようにΔ
Ｌを実測し、制御装置４０にΔＬを入力する。To measure the amount of skew of the transfer material in the fixing nip portion of the image forming apparatus, a solid toner image is formed on an A3-size sheet of white paper, and transferred at a position 5 cm from the rear end of the transfer material for about 20 seconds. After the material is stopped, the fixing roller and the pressure roller are driven again to discharge the transfer material. Here, as described above, Δ
L is measured, and ΔL is input to the control device 40.
【００３８】制御装置４０内には、予め実験で求めたΔ
Ｌと搬送部２の下流側の可変量ΔＸの補正曲線により搬
送部下流側の軸線と定着挟圧部の軸線のなす角を搬送部
下流側の軸線を適宜調整することによって調整した。In the control device 40, a value Δ
The angle between the axis of the transport unit downstream and the axis of the fixing nip unit was adjusted by appropriately adjusting the axis of the transport unit downstream according to L and the correction curve of the variable amount ΔX downstream of the transport unit 2.
【００３９】而して、本実施例においては、 随時挟圧部
前においての転写材の進行方向を制御することにより、
転写材の搬送部上での進行方向と挟圧部内の進行方向一
致させるように絶えず調整制御するため、紙しわ、挟圧
部直前で片側にループが過多にでき、挟圧部前で一部の
未定着画像がローラに接触して未定着画像を乱す等の問
題を解決することができた。Thus, in this embodiment, by controlling the traveling direction of the transfer material in front of the clamping portion as needed,
In order to constantly adjust and control the traveling direction of the transfer material on the transport unit to the traveling direction in the clamping unit, paper wrinkles, loops can be excessive on one side just before the clamping unit, and some loops can occur before the clamping unit. The problem that the unfixed image contacts the roller and disturbs the unfixed image can be solved.
【００４０】同様にして、図３で説明したような画像形
成装置においても、最終感光ドラム１ｄと定着部の距離
が極端に短くなっているため、特に紙しわ、未定着画像
の乱れ等の問題が多発していたが、この問題に対しても
著しい改善結果が得られた。。Similarly, in the image forming apparatus as described with reference to FIG. 3, since the distance between the final photosensitive drum 1d and the fixing unit is extremely short, problems such as paper wrinkles and unfixed image disturbance are caused. However, remarkable improvement results were obtained for this problem. .
【００４１】＜実施の形態２＞次に、本発明の実施の形
態２を図４に基づいてを用い、第１の実施例を説明す
る。<Embodiment 2> Next, a first embodiment of the present invention will be described with reference to FIG.
【００４２】本実施の形態は、前記実施の形態１の転写
材上に形成された光沢変化のそれぞれの寸法を画像形成
装置の画像読み取り部６０で読み取り、寸法を計算する
ことを特徴とする。The present embodiment is characterized in that each dimension of the change in gloss formed on the transfer material of the first embodiment is read by the image reading section 60 of the image forming apparatus, and the dimension is calculated.
【００４３】即ち、図４に示すように、転写材３０上に
形成された光沢変化画像を画像読み取り部６０で読み込
み、定着挟圧部内の斜行量ΔＬを自動的に算出可能にし
た。That is, as shown in FIG. 4, the gloss-changed image formed on the transfer material 30 is read by the image reading section 60, and the skew amount ΔL in the fixing clamping section can be automatically calculated.
【００４４】＜実施の形態３＞次に、本発明の実施の形
態３を図５及び図６に基づいて説明する。Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS.
【００４５】本実施の形態は、転写材の挟圧部内を進行
する間の斜行量を測定する手段が、搬送部と定着部の間
の長手軸方向、用紙手前側と奥側の用紙通紙領域内に、
先端部の通過を検知できる検出手段を有し、転写材通過
の、先端通過時間の手前側と奥側の差を測定することに
より行うことを特徴とする。In the present embodiment, the means for measuring the amount of skew of the transfer material while the transfer material travels inside the pressurizing portion is provided in the longitudinal direction between the transporting portion and the fixing portion, and in the front and back sides of the sheet. Within the paper area,
It has a detecting means capable of detecting the passage of the leading end, and is characterized by measuring the difference of the leading end passage time between the front side and the back side of the transfer material passage.
【００４６】図５において、５０ａ，５０ｂはフォトダ
イオード等の検知装置であり、これらは転写材の先端と
後端の通過を検知する。これらの検知装置５０ａ，５０
ｂは、定着入口ガイド３の長手軸方向の用紙手前側と奥
側にそれぞれ配置されている。In FIG. 5, reference numerals 50a and 50b denote detectors such as photodiodes, which detect the passage of the leading and trailing ends of the transfer material. These detection devices 50a, 50
b are disposed on the front side and the back side of the paper in the longitudinal axis direction of the fixing entrance guide 3, respectively.
【００４７】ここで、検知装置５０ａ，５０ｂの測定原
理を図６に基づいて説明する。Here, the measurement principle of the detection devices 50a and 50b will be described with reference to FIG.
【００４８】先ず、転写材３０の先端部が検知装置５０
ａ，５０ｂを同一のタイミングで通過した場合、該転写
材３０の手前側の検知装置５０ａの通過タイミングをＴ
１、奥側の検知装置５０ｂの通過タイミングをＴ２と
し、定着ローラの回転速度をｘとしたとき、転写材３０
は定着挟圧部内で（Ｔ２−Ｔ１）×ｘ分だけ斜行する。
従って、検知装置５０ａ，５０ｂによって転写材３０の
定着挟圧部前の斜行量をその都度正確に測定することが
できる。First, the leading end of the transfer material 30 is
a and 50b at the same timing, the passing timing of the detecting device 50a on the near side of the transfer material 30 is set to T.
1. Assuming that the passage timing of the detection device 50b on the back side is T2 and the rotation speed of the fixing roller is x, the transfer material 30
Is skewed by (T2−T1) × x in the fixing nip portion.
Therefore, the skew amount of the transfer material 30 in front of the fixing nip portion can be accurately measured each time by the detection devices 50a and 50b.
【００４９】＜実施の形態４＞次に、本発明の実施の形
態４を図７に基づいて説明する。<Fourth Embodiment> Next, a fourth embodiment of the present invention will be described with reference to FIG.
【００５０】本実施の形態は、転写材の挟圧部以前の進
行方向の修正手段が、搬送部下流側の軸線と定着狭圧部
の軸線のなす角を、搬送部下流側の軸線を適宜調整する
ことによって調整することを特徴とする。In this embodiment, the means for correcting the direction of travel of the transfer material before the pressure portion of the transfer material adjusts the angle between the axis of the downstream side of the transport portion and the axis of the fixing narrow pressure portion and the axis of the downstream side of the transport portion as appropriate. The adjustment is performed by adjusting.
【００５１】本実施の形態においても、前記実施の形態
と同様、随時挟圧部前においての転写材の進行方向を制
御することにより、転写材の搬送部上での進行方向と挟
圧部内の進行方向を一致させるように調整制御するた
め、紙しわ、挟圧部直前で片側にループが過多にでき、
挟圧部前で一部の未定着画像がローラに接触して未定着
画像を乱す等の問題を全般的に解決することができる。Also in this embodiment, similarly to the above-described embodiment, by controlling the traveling direction of the transfer material in front of the nip portion at any time, the traveling direction of the transfer material on the transport portion and the inside of the nip portion are controlled. In order to control the adjustment so that the traveling direction matches, paper wrinkles, excessive loops on one side just before the clamping part,
It is possible to generally solve the problem that a part of the unfixed image comes into contact with the roller before the nip portion and disturbs the unfixed image.
【００５２】[0052]
【発明の効果】以上の説明で明らかなように、本発明に
よれば、像担持体上に可視のトナー像を形成する画像形
成部と、前記トナー像を転写材上に転写する転写部と、
転写材を搬送するための搬送部と、転写材上の未定着ト
ナー像を定着するための定着部を備え、定着部が互いに
圧接状態で回転する一対のローラと少なくとも片側のロ
ーラの内側に熱源を有し、ローラ間の挟圧部において未
定着トナー画像を加熱及び加圧してこれを転写材に定着
させる画像形成装置において、前記転写材が前記挟圧部
内に進入するときの斜行量を測定するモードを設けたた
め、斜行に起因する転写材のしわや未定着画像の乱れ等
を防いで高質画像を安定して形成することができるとい
う効果が得られる。As is apparent from the above description, according to the present invention, an image forming section for forming a visible toner image on an image carrier, and a transfer section for transferring the toner image onto a transfer material are provided. ,
A fixing unit for fixing an unfixed toner image on the transfer material; a pair of rollers that rotate in pressure contact with each other; and a heat source inside at least one of the rollers. In an image forming apparatus that heats and presses an unfixed toner image at a nip portion between rollers and fixes the unfixed toner image to a transfer material, an amount of skew when the transfer material enters the nip portion is determined. Since the measurement mode is provided, it is possible to obtain an effect that a high quality image can be stably formed while preventing wrinkles of the transfer material and disturbance of the unfixed image due to skew.
【図１】本発明の実施の形態１に係る画像形成装置の概
略図である。FIG. 1 is a schematic diagram of an image forming apparatus according to Embodiment 1 of the present invention.
【図２】転写材の斜行量の測定原理を説明する図であ
る。FIG. 2 is a diagram illustrating a principle of measuring a skew amount of a transfer material.
【図３】本発明の実施の形態１に係る画像形成装置の概
略図である。FIG. 3 is a schematic diagram of an image forming apparatus according to Embodiment 1 of the present invention.
【図４】本発明の実施の形態２に係る画像形成装置の概
略断面図である。FIG. 4 is a schematic sectional view of an image forming apparatus according to Embodiment 2 of the present invention.
【図５】本発明の実施の形態３に係る画像形成装置の定
着部の斜視図である。FIG. 5 is a perspective view of a fixing unit of the image forming apparatus according to Embodiment 3 of the present invention.
【図６】本発明の実施の形態３に係る画像形成装置にお
ける転写材の斜行量の測定原理を説明する図である。FIG. 6 is a diagram illustrating a principle of measuring a skew amount of a transfer material in an image forming apparatus according to a third embodiment of the present invention.
【図７】本発明の実施の形態４に係る画像形成装置の概
略図である。FIG. 7 is a schematic diagram of an image forming apparatus according to Embodiment 4 of the present invention.
【図８】従来の画像形成装置の概略図である。FIG. 8 is a schematic diagram of a conventional image forming apparatus.
【図９】従来の画像形成装置の概略図である。FIG. 9 is a schematic diagram of a conventional image forming apparatus.
１ 感光体（像担持体） ２ 搬送部 ３ 定着入口ガイド ４ 定着ローラ ５ 加圧ローラ １０ 転写帯電器 ２０ 分離帯電器 ３０ 転写材 ４０ 制御装置 ５０ａ，５０ｂ 検出装置 ６０ 画像読み取り部 ７０ アクチュエータ REFERENCE SIGNS LIST 1 photoconductor (image carrier) 2 conveyance unit 3 fixing entrance guide 4 fixing roller 5 pressure roller 10 transfer charger 20 separation charger 30 transfer material 40 control device 50a, 50b detection device 60 image reading unit 70 actuator
Claims (7)
画像形成部と、前記トナー像を転写材上に転写する転写
部と、転写材を搬送するための搬送部と、転写材上の未
定着トナー像を定着するための定着部を備え、定着部が
互いに圧接状態で回転する一対のローラと少なくとも片
側のローラの内側に熱源を有し、ローラ間の挟圧部にお
いて未定着トナー画像を加熱及び加圧してこれを転写材
に定着させる画像形成装置において、 前記転写材が前記挟圧部内に進入するときの斜行量を測
定するモードを設けたことを特徴とする画像形成装置。An image forming section for forming a visible toner image on an image carrier; a transfer section for transferring the toner image onto a transfer material; a transport section for transporting the transfer material; A fixing unit for fixing the unfixed toner image, the fixing unit having a pair of rollers rotating in a pressure-contact state with each other, and a heat source inside at least one of the rollers, and the unfixed toner in a pressure portion between the rollers. An image forming apparatus for heating and pressurizing an image to fix the image on a transfer material, wherein an image forming apparatus is provided with a mode for measuring a skew amount when the transfer material enters into the pressing portion. .
前記挟圧部への進行方向を修正し、転写材が前記搬送部
上の進行方向に対して直進するよう制御することを特徴
とする請求項１記載の画像形成装置。2. The method according to claim 1, wherein the direction of travel of the transfer material to the pressing portion is corrected in accordance with the amount of skew of the transfer material, and the transfer material is controlled so as to travel straight in the direction of travel on the transport unit. The image forming apparatus according to claim 1, wherein:
量を測定を、転写材上にべた画像を形成し、挟圧部内に
おいて転写材を一定時間停止滞留させた後に排出し、転
写材上に形成される光沢変化（挟圧部の跡）の転写材の
先端部からの距離の手前側と奥側の差を測定することに
より行うことを特徴とする請求項１又は２記載の画像形
成装置。3. A method for measuring the amount of skew of the transfer material up to immediately before the pressure portion, forming a solid image on the transfer material, stopping the transfer material for a predetermined time in the pressure portion, and discharging the transfer material; 3. The method according to claim 1, wherein a difference between a front side and a back side of a distance from a front end portion of the transfer material of a change in gloss formed on the transfer material (a trace of the pressure portion) is measured. Image forming apparatus.
れぞれの寸法を画像読み取り部で読み取って寸法を計算
することを特徴とする請求項１〜３の何れかに記載の画
像形成装置。4. The image forming apparatus according to claim 1, wherein each dimension of the change in gloss formed on the transfer material is read by an image reading unit to calculate the dimension.
の斜行量を測定する手段は、前記搬送部と定着部の間の
長手軸方向、用紙手前側、奥側の用紙通紙領域内に転写
材の先端部の通過を検知する検出手段を有し、転写材の
先端通過時間の手前側と奥側の差を測定することにより
転写材の斜行量を測定することを特徴とする請求項１又
は２記載の画像形成装置。5. A means for measuring an amount of skew of the transfer material while the transfer material travels in the holding portion, wherein the sheet passing means is disposed in a longitudinal direction between the transporting portion and the fixing portion, a front side of the sheet, and a rear side of the sheet. It has a detection means for detecting the passage of the leading end of the transfer material in the area, and measures the skew amount of the transfer material by measuring the difference between the front side and the back side of the passage time of the leading end of the transfer material. 3. The image forming apparatus according to claim 1, wherein:
修正手段は、前記定着部の互いに圧接状態で回転する一
対のローラの軸方向と搬送部の平行度を一対のローラの
軸角度を調整することによって調整することを特徴とす
る請求項１〜５の何れかに記載の画像形成装置。6. A fixing device for correcting the direction of travel of the transfer material in the holding portion, wherein the parallel direction of the pair of rollers rotating in a state where the fixing portion is pressed against each other and the parallelism of the conveying portion are adjusted by the axial angle of the pair of rollers. The image forming apparatus according to claim 1, wherein the image forming apparatus adjusts the image forming apparatus.
修正手段は、前記定着部の互いに圧接状態で回転する一
対のローラの軸方向と搬送部の平行度を搬送部の軸角度
を調整することによって調整することを特徴とする請求
項１〜５の何れかに記載の画像形成装置。7. A correcting device for correcting the direction of travel of the transfer material in the pressing portion, wherein the parallel direction of the pair of rollers rotating in a state where the fixing portion is pressed against each other and the parallelism of the transport portion are used to determine the axial angle of the transport portion. The image forming apparatus according to claim 1, wherein the adjustment is performed by adjusting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001043814A JP2002244496A (en) | 2001-02-20 | 2001-02-20 | Image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001043814A JP2002244496A (en) | 2001-02-20 | 2001-02-20 | Image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002244496A true JP2002244496A (en) | 2002-08-30 |
Family
ID=18905921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001043814A Withdrawn JP2002244496A (en) | 2001-02-20 | 2001-02-20 | Image forming device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7567762B2 (en) * | 2005-11-07 | 2009-07-28 | Fuji Xerox Co., Ltd. | Image forming apparatus capable of detecting paper skew |
| US20100074667A1 (en) * | 2008-09-19 | 2010-03-25 | Masanao Ehara | Image forming apparatus |
-
2001
- 2001-02-20 JP JP2001043814A patent/JP2002244496A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7567762B2 (en) * | 2005-11-07 | 2009-07-28 | Fuji Xerox Co., Ltd. | Image forming apparatus capable of detecting paper skew |
| US20100074667A1 (en) * | 2008-09-19 | 2010-03-25 | Masanao Ehara | Image forming apparatus |
| JP2010072426A (en) * | 2008-09-19 | 2010-04-02 | Ricoh Co Ltd | Image forming apparatus |
| US8755732B2 (en) | 2008-09-19 | 2014-06-17 | Ricoh Company, Ltd. | Image forming apparatus having a transfer unit for transferring an image to a recording sheet |
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