JP5838495B2 - Measuring apparatus and image forming apparatus having the same - Google Patents
Measuring apparatus and image forming apparatus having the same Download PDFInfo
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Description
本発明は、用紙に形成された画像特性を測定する装置等に関し、より詳細には、搬送中の用紙に形成された画像の光沢度や濃度、表色値などの特性を測定する装置等に関するものである。 The present invention relates to an apparatus for measuring image characteristics formed on a sheet, and more particularly to an apparatus for measuring characteristics such as glossiness, density, and color values of an image formed on a sheet being conveyed. Is.
ファクシミリやプリンター、複写機などの電子写真方式の画像形成装置、特にプロダクトプリンティングの分野で用いられる画像形成装置には、画像の安定性が強く要求される。近年、画像の光沢が色味に少なからず影響していることが知られるようになり、画像の安定性を向上させるために、形成された画像の光沢を装置内で測定して、画像形成条件や定着条件を調整することが行われつつある。 Electrophotographic image forming apparatuses such as facsimiles, printers, and copiers, particularly image forming apparatuses used in the field of product printing, are strongly required to have image stability. In recent years, it has become known that the gloss of an image has a considerable influence on the color, and in order to improve the stability of the image, the gloss of the formed image is measured in the apparatus, and the image forming conditions And fixing conditions are being adjusted.
例えば、定着後の記録媒体上の定着された現像剤像表面の光沢を測定し、測定結果に応じて画像形成条件や定着条件を制御する技術が提案されている（例えば特許文献１〜４を参照）。 For example, a technique has been proposed in which the gloss of the surface of a fixed developer image on a recording medium after fixing is measured, and image forming conditions and fixing conditions are controlled according to the measurement results (for example, Patent Documents 1 to 4). reference).
また特許文献５では、複数の貫通孔が形成された搬送ベルト上に、定着後の記録媒体を吸引・吸着させて、記録媒体を空冷するとともに画像特性を検査する技術が提案されている。 Patent Document 5 proposes a technique for sucking and adsorbing a fixed recording medium onto a conveyance belt having a plurality of through holes to air-cool the recording medium and inspect image characteristics.
例えばトナー画像の光沢は、「JIS Z 8741」で規定されているように、トナー画像に照射された光のうち正反射した光の受光量を測定して求められる。したがって、特許文献１〜４で提案されている技術では、測定部から用紙までの距離や用紙の傾きが絶えず変動するため、高い測定精度を得ることは困難であった。また、特許文献５で提案されている技術では、搬送ベルト上に記録媒体が吸着固定されるものの、貫通孔上の記録媒体部分が窪むなどの変形が生じるため、やはり高い測定精度を得ることは困難と考えられる。 For example, the glossiness of a toner image can be obtained by measuring the amount of received light of specularly reflected light among the light irradiated on the toner image, as defined in “JIS Z 8741”. Therefore, in the techniques proposed in Patent Documents 1 to 4, it is difficult to obtain high measurement accuracy because the distance from the measurement unit to the paper and the inclination of the paper constantly fluctuate. Further, in the technique proposed in Patent Document 5, although the recording medium is adsorbed and fixed on the conveyance belt, the recording medium portion on the through hole is deformed so that high measurement accuracy can be obtained. Is considered difficult.
そこで本発明の目的は、搬送中の用紙上の画像の光沢度や濃度、表色値などの特性を高い精度で測定できる装置を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus capable of measuring characteristics such as glossiness, density, and color value of an image on a sheet being conveyed with high accuracy.
また本発明の他の目的は、所望の光沢度や色味の画像が安定して得られる画像形成装置を提供することにある。 Another object of the present invention is to provide an image forming apparatus capable of stably obtaining an image having a desired glossiness and color.
前記目的を達成する本発明に係る測定装置は、搬送中の用紙に形成された画像の特性を測定する装置であって、搬送中の用紙に形成された画像の特性を非接触で測定する測定手段と、搬送中の用紙の画像形成面側に空気を吹き付けて、前記測定手段による測定位置において、搬送路の内壁に摺接しながら用紙を移動させる送風手段と、前記測定位置よりも用紙搬送方向上流側及び下流側にそれぞれ設けられ、用紙を挟持して搬送する搬送ローラ対とを備え、前記搬送ローラ対の一方が駆動ローラ対、もう一方が従動ローラ対であり、前記駆動ローラ対側から前記従動ローラ対側に向かって用紙に対して所定角度で前記送風手段から空気を吹き付けることを特徴とする。 The measuring device according to the present invention for achieving the above object is a device for measuring the characteristics of an image formed on a sheet being conveyed, and for measuring the characteristics of an image formed on a sheet being conveyed in a non-contact manner. And air blowing means for blowing the air to the image forming surface side of the paper being conveyed and moving the paper while sliding on the inner wall of the conveyance path at the measurement position by the measurement means, and the paper conveyance direction from the measurement position A pair of conveyance rollers that are provided on the upstream side and the downstream side, respectively, and convey the paper while sandwiching the sheet , wherein one of the conveyance roller pair is a driving roller pair and the other is a driven roller pair. characterized Rukoto blown air from the blower means in a predetermined angle to the sheet toward said driven roller pair side.
ここで、前記測定手段としては、搬送中の用紙に向かって光を照射する発光部と、用紙に形成された画像で反射された光を受光する受光部とを有するものが好ましい。 Here, the measuring unit preferably includes a light emitting unit that emits light toward the paper being conveyed and a light receiving unit that receives the light reflected by the image formed on the paper.
また、前記測定手段は、搬送中の用紙に形成された画像の光沢度、濃度、表色値の少なくとも一つを測定するものが好ましい。 The measuring means preferably measures at least one of glossiness, density, and color value of an image formed on the paper being conveyed.
また本発明によれば、前記のいずれかに記載の測定装置を有することを特徴とする画像形成装置が提供される。 In addition, according to the present invention, there is provided an image forming apparatus comprising the measuring apparatus according to any one of the above.
本発明の測定装置によれば、搬送中の用紙に形成された画像の光沢度や濃度、表色値などの特性を高い精度で測定することができる。 According to the measuring apparatus of the present invention, it is possible to measure characteristics such as glossiness, density, and color value of an image formed on a sheet being conveyed with high accuracy.
また本発明の画像形成装置によれば、所望の光沢と色味の画像が安定して得られる。 Further, according to the image forming apparatus of the present invention, an image having a desired gloss and color can be stably obtained.
以下、本発明に係る測定装置及び画像形成装置について図に基づいて説明するが、本発明はこれらの実施形態に何ら限定されるものではない。 Hereinafter, the measurement apparatus and the image forming apparatus according to the present invention will be described with reference to the drawings. However, the present invention is not limited to these embodiments.
図１に、本発明に係る画像形成装置の一実施形態を示す概略構成図を示す。図１に示す画像形成装置８は、画像を形成するプリンター部８１と、原稿画像を読み取るイメージリーダ部８２と、使用者が画像形成条件を入力したり装置の状態等を表示する操作表示部８３とを備える。イメージリーダ部８２は、不図示の原稿ガラス板の上に載置された原稿を、スキャナを移動して読み取る公知のもので、不図示のＣＣＤイメージセンサにより電気信号に変換された画像データが得られる。 FIG. 1 is a schematic configuration diagram showing an embodiment of an image forming apparatus according to the present invention. An image forming apparatus 8 shown in FIG. 1 includes a printer unit 81 that forms an image, an image reader unit 82 that reads a document image, and an operation display unit 83 that allows a user to input image forming conditions and display the state of the apparatus. With. The image reader unit 82 is a known unit that reads a document placed on a document glass plate (not shown) by moving a scanner, and obtains image data converted into an electrical signal by a CCD image sensor (not shown). It is done.
プリンター部８１には、トナー像を担持し、時計回りに回転する円筒状の感光体（静電潜像担持体）Ｄの周囲に、感光体Ｄの表面を一様に帯電させる帯電装置２と、感光体Ｄ表面に光を照射して静電潜像を形成する露光装置３と、感光体Ｄにトナーを供給し感光体Ｄ上の静電潜像を現像してトナー像を形成する現像装置４と、現像装置４によって形成された感光体Ｄ上のトナー像を用紙Ｐに転写する転写ローラ（転写装置）５と、用紙Ｐに転写されずに感光体Ｄ上に残留したトナーを除去するクリーニング装置６とが設けられている。 The printer unit 81 includes a charging device 2 that carries a toner image and charges the surface of the photoconductor D uniformly around a cylindrical photoconductor (electrostatic latent image carrier) D that rotates clockwise. , An exposure device 3 that forms an electrostatic latent image by irradiating light on the surface of the photoconductor D, and a development that supplies toner to the photoconductor D and develops the electrostatic latent image on the photoconductor D to form a toner image. The transfer roller (transfer device) 5 that transfers the toner image on the photoconductor D formed by the device 4 and the developing device 4 to the paper P, and removes the toner remaining on the photoconductor D without being transferred to the paper P A cleaning device 6 is provided.
帯電装置２は、スコロトロン方式の帯電装置であって、感光体Ｄに対向する面側が開口した箱状のシールド電極２２と、シールド電極２２内に張架された放電電極２１と、シールド電極２２の開口に取り付けられたグリッド電極２３とを有する。放電電極２１に数ｋＶの電圧が印加されるとコロナ放電が発生し、これに感光体Ｄの表面が一様に帯電される。なお、帯電装置２の種類は特に限定されるものでなく、ローラ方式の帯電部材、ブレード状の帯電部材、ブラシ状の帯電部材等を用いてももちろん構わない。 The charging device 2 is a scorotron charging device, and includes a box-shaped shield electrode 22 having an opening on the side facing the photoreceptor D, a discharge electrode 21 stretched in the shield electrode 22, and a shield electrode 22. And a grid electrode 23 attached to the opening. When a voltage of several kV is applied to the discharge electrode 21, a corona discharge is generated, and the surface of the photoreceptor D is uniformly charged. The type of the charging device 2 is not particularly limited. Of course, a roller-type charging member, a blade-shaped charging member, a brush-shaped charging member, or the like may be used.
露光装置３は、帯電装置２によって一様に帯電された感光体Ｄの表面に、例えばパソコンなどの外部装置から入力される画像データに基づいて、選択的に光を照射して露光を行い、感光体Ｄの表面に所定の静電潜像を形成する。 The exposure device 3 performs exposure by selectively irradiating light on the surface of the photoreceptor D uniformly charged by the charging device 2 based on image data input from an external device such as a personal computer, A predetermined electrostatic latent image is formed on the surface of the photoreceptor D.
現像装置４は、ハウジング４１と、感光体Ｄに対向し回転可能に設けられた現像ローラ４２と、現像ローラ４２に向かって現像剤を搬送する搬送ローラ４３とを備える。ハウジング４１内にはトナーとキャリア（いずれも不図示）とからなる現像剤が収容されている。現像ローラ４２に現像バイアス電圧を印加すると、現像ローラ４２に印加される電圧と感光体Ｄの静電潜像との電位差によってトナーが感光体Ｄに移動し、感光体Ｄ上の静電潜像がトナーによって可視像化（トナー画像）される。 The developing device 4 includes a housing 41, a developing roller 42 that is rotatably provided facing the photoreceptor D, and a transport roller 43 that transports the developer toward the developing roller 42. In the housing 41, a developer composed of toner and a carrier (both not shown) is accommodated. When a developing bias voltage is applied to the developing roller 42, the toner moves to the photosensitive member D due to the potential difference between the voltage applied to the developing roller 42 and the electrostatic latent image on the photosensitive member D, and the electrostatic latent image on the photosensitive member D is transferred. Is visualized (toner image) with toner.
転写ローラ５は、転写ローラ５に連結された駆動モータ（不図示）によって回転可能に設けられるとともに付勢部材（不図示）によって感光体Ｄに圧接している。また転写ローラ５には、不図示の電圧印加手段によって、トナーの帯電極性と逆極性の転写バイアス電圧が印加される。感光体Ｄと転写ローラ５との間を用紙Ｐが通過する際に、転写ローラ５に前記転写バイアス電圧が印加され、感光体Ｄに形成されたトナー画像が用紙Ｐに転写する。 The transfer roller 5 is rotatably provided by a drive motor (not shown) connected to the transfer roller 5 and is pressed against the photoreceptor D by a biasing member (not shown). Further, a transfer bias voltage having a polarity opposite to the charging polarity of the toner is applied to the transfer roller 5 by a voltage applying unit (not shown). When the paper P passes between the photoconductor D and the transfer roller 5, the transfer bias voltage is applied to the transfer roller 5, and the toner image formed on the photoconductor D is transferred to the paper P.
クリーニング装置６は、感光体Ｄに圧接するクリーニングブレード６１を備え、感光体Ｄ表面に残留する未転写トナーを感光体Ｄから除去する。 The cleaning device 6 includes a cleaning blade 61 that presses against the photoconductor D, and removes untransferred toner remaining on the surface of the photoconductor D from the photoconductor D.
プリンター部８１の下部には、用紙Ｐを収納した給紙カセット５１がプリンター部８１に対して着脱自在に配置されている。給紙カセット５１内に収納された用紙Ｐは、給紙カセット５１の上方側部に配置された給紙ローラ５２の回転によって最上紙から順に１枚ずつ搬送路５０に送り出される。給紙カセット５１から送り出された用紙Ｐは、レジストローラ対５３に搬送され、レジストローラ対５３から感光体Ｄの回転とタイミングを合わせて転写ローラ５と感光体Ｄとのニップ部に送り出され、前述の通りトナー画像が用紙Ｐに転写される。 Under the printer unit 81, a paper feed cassette 51 that stores paper P is detachably disposed with respect to the printer unit 81. The paper P stored in the paper feed cassette 51 is sent to the transport path 50 one by one in order from the uppermost paper by the rotation of the paper feed roller 52 disposed on the upper side of the paper feed cassette 51. The paper P sent out from the paper feed cassette 51 is conveyed to the registration roller pair 53 and sent out from the registration roller pair 53 to the nip portion between the transfer roller 5 and the photoconductor D in synchronization with the rotation of the photoconductor D. As described above, the toner image is transferred onto the paper P.
さらに、プリンター部８１は、感光体Ｄから用紙Ｐに転写されたトナー画像を定着させる定着装置１を備えている。定着装置１は、ハロゲンヒータＨを内蔵した定着ローラ１１と、定着ローラ１１に圧接する加圧ローラ１２とを有する。定着ローラ１１と加圧ローラ１２とのニップ部を用紙Ｐが通過する際に加熱及び加圧されてトナー画像が用紙Ｐに溶融定着される。そして、用紙Ｐは、測定装置７を通って排出口５５から本体側面の排紙トレイ８５に排出される。 Further, the printer unit 81 includes a fixing device 1 that fixes the toner image transferred from the photoreceptor D to the paper P. The fixing device 1 includes a fixing roller 11 including a halogen heater H and a pressure roller 12 that is in pressure contact with the fixing roller 11. When the paper P passes through the nip portion between the fixing roller 11 and the pressure roller 12, the toner image is melted and fixed on the paper P by being heated and pressurized. Then, the paper P passes through the measuring device 7 and is discharged from the discharge port 55 to the discharge tray 85 on the side surface of the main body.
画像形成装置８は、画像形成装置８に関係する構成要素を総合的に制御する制御装置８４を備えており、この制御装置８４は、感光体Ｄ、現像ローラ４２、転写ローラ５、給紙ローラ５２、搬送ローラ５３及び定着ローラ１１などの回転駆動と帯電装置２、露光装置３、現像装置４などの作動を制御すると共に、後述する測定装置７の測定値に基づいて定着ローラ１１の搬送速度やハロゲンヒータＨの入切を制御し、用紙Ｐに形成されたトナー像の光沢を調整する。もちろん、制御装置８４の制御動作は、操作表示部８３から使用者が入力した設定条件によっても実行される。 The image forming apparatus 8 includes a control device 84 that comprehensively controls components related to the image forming device 8. The control device 84 includes the photosensitive member D, the developing roller 42, the transfer roller 5, and a paper feed roller. 52, the rotational drive of the conveying roller 53 and the fixing roller 11 and the operation of the charging device 2, the exposure device 3 and the developing device 4 are controlled, and the conveying speed of the fixing roller 11 is based on the measured value of the measuring device 7 which will be described later. Further, on / off of the halogen heater H is controlled to adjust the gloss of the toner image formed on the paper P. Of course, the control operation of the control device 84 is also executed according to the setting conditions input by the user from the operation display unit 83.
図２に測定装置７の概略構成図を示す。測定装置７は、定着装置１の用紙搬送方向下流に設けられ、測定基準位置ＳＰに向かって光を照射する発光部（測定手段）７１と、用紙Ｐに形成されたトナー像で正反射（入射角と反射角とが等しい）された光を受光する受光部（測定手段）７２と、測定基準位置ＳＰに向かって空気を吹き付ける送風ファン（送風手段）７５と、測定基準位置ＳＰの用紙搬送方向上流側及び下流側に設けられた第１搬送ローラ対７３及び第２搬送ローラ対７４とを有する。 FIG. 2 shows a schematic configuration diagram of the measuring device 7. The measuring device 7 is provided downstream of the fixing device 1 in the sheet conveyance direction, and a light emitting unit (measuring unit) 71 that irradiates light toward the measurement reference position SP, and regular reflection (incidence) by a toner image formed on the sheet P. A light receiving unit (measuring unit) 72 that receives light having an angle equal to a reflection angle, a blower fan (blowing unit) 75 that blows air toward the measurement reference position SP, and a sheet conveyance direction of the measurement reference position SP. A first conveyance roller pair 73 and a second conveyance roller pair 74 are provided on the upstream side and the downstream side.
搬送中の用紙Ｐは不安定であるため、通常の装置では、測定基準位置ＳＰにおいて用紙Ｐは図のＸ，Ｙ，Ｚ方向にずれた状態となっている。用紙Ｐが、図のＸ，Ｙ，Ｚ方向のいずれの方向にずれても、トナー像での正反射光が受光部７２に正しく入射しないので、トナー像の光沢を高い精度で測定できなかった。 Since the sheet P being conveyed is unstable, the sheet P is shifted in the X, Y, and Z directions in the drawing at the measurement reference position SP in a normal apparatus. Even if the paper P is deviated in any of the X, Y, and Z directions in the figure, the specularly reflected light from the toner image does not enter the light receiving unit 72 correctly, so the gloss of the toner image cannot be measured with high accuracy. .
そこで、本発明の測定装置では、送風ファン７５からダクト７６を介して測定基準位置ＳＰに向かって空気を吹き付けるようにした。これにより、搬送されてきた用紙Ｐは、搬送路７９の内壁に押し付けられ、内壁に摺接しながら移動し、測定基準位置ＳＰにおいて用紙Ｐは図のＸ，Ｙ，Ｚ方向に位置決めされた状態となる。以下、具体的制御内容について説明する。 Therefore, in the measuring apparatus of the present invention, air is blown from the blower fan 75 through the duct 76 toward the measurement reference position SP. As a result, the conveyed paper P is pressed against the inner wall of the conveyance path 79 and moves while being in sliding contact with the inner wall, and the paper P is positioned in the X, Y, and Z directions in the drawing at the measurement reference position SP. Become. Hereinafter, specific control contents will be described.
第１搬送ローラ対７３は駆動ローラ対であって用紙Ｐを挟持搬送する。一方、第２搬送ローラ対７４は従動ローラ対である。第１搬送ローラ対７３に用紙Ｐの先端が挟持されたことが、不図示のセンサーによって検知されると、送風ファン７５が起動する。送風ファン７５から送り出される空気は、ダクト７６を通って、用紙搬送方向上流側から下流側に向かって用紙Ｐに対して所定角度で吹き出す。このとき用紙Ｐには、吹き付ける空気によって外方に広がる力がかかり、用紙Ｐが撓むことはない。搬送されてきた用紙Ｐは、ダクト７６から吹き出す空気によって搬送路７９の下側内壁に押し付けられ、内壁に摺接しながら測定基準位置ＳＰを通過する。後述するように、測定基準位置ＳＰでは発光部７１から光が照射され、受光部７２でその反射光が受光され、トナー像の光沢度や濃度、表色値などの特性値が測定される。そして、用紙Ｐの先端が第２搬送ローラ対７４に挟持されると、送風ファン７５が停止し測定手段による測定が終了する。 The first transport roller pair 73 is a drive roller pair, and sandwiches and transports the paper P. On the other hand, the second transport roller pair 74 is a driven roller pair. When it is detected by a sensor (not shown) that the leading edge of the sheet P is sandwiched between the first conveying roller pair 73, the blower fan 75 is activated. The air sent out from the blower fan 75 passes through the duct 76 and blows out at a predetermined angle with respect to the paper P from the upstream side to the downstream side in the paper transport direction. At this time, the paper P is subjected to a force spreading outward by the air to be blown, and the paper P does not bend. The transported paper P is pressed against the lower inner wall of the transport path 79 by the air blown out from the duct 76, and passes through the measurement reference position SP while sliding on the inner wall. As will be described later, light is emitted from the light emitting unit 71 at the measurement reference position SP, and the reflected light is received by the light receiving unit 72, and characteristic values such as glossiness, density, and color value of the toner image are measured. When the leading edge of the paper P is sandwiched between the second conveying roller pair 74, the blower fan 75 is stopped and the measurement by the measuring unit is finished.
なお、送風ファン７５及び測定手段の入切制御は、センサーによる用紙位置の検知に基づく制御の他、所定時間経過に基づく制御であっても構わない。 The on / off control of the blower fan 75 and the measuring means may be control based on passage of a predetermined time in addition to control based on detection of the paper position by the sensor.
用紙Ｐに向かって吹き付ける空気の圧力は、用紙Ｐが搬送路７９の内壁に押し付けられる圧力であればよく特に限定はない。例えば、図５に示すモデルによって下記式から算出される風圧Ｐとしてもよい。
Ｐ＝３ＥＩ／（ＡＬ３）
（式中、Ｅ：ヤング率（ＭＰａ）、Ｉ：断面二次モーメント、σ：たわみ量（ｍｍ）、Ａ：空気が当たる面積（ｍｍ２）、Ｌ：距離（ｍｍ））
The pressure of the air blown toward the sheet P is not particularly limited as long as the sheet P is pressed against the inner wall of the conveyance path 79. For example, it is good also as the wind pressure P calculated from a following formula with the model shown in FIG.
P = 3EI / (AL 3 )
(Where E: Young's modulus (MPa), I: sectional moment of inertia, σ: deflection amount (mm), A: area where air hits (mm 2 ), L: distance (mm))
また、送風手段としては送風ファン７５の他、軸流ファンやシロッコファン、コンプレッサなど従来公知の手段を用いることができる。そしてまた、搬送路７９の内周面は、用紙Ｐの摺動抵抗を抑えるため平滑面とすることが望ましい。 In addition to the blower fan 75, conventionally known means such as an axial fan, a sirocco fan, and a compressor can be used as the blower. In addition, the inner peripheral surface of the conveyance path 79 is desirably a smooth surface in order to suppress the sliding resistance of the paper P.
発光部７１から用紙Ｐのトナー像に向かって照射する光は、平行光であれば特に限定はなく、可視光や赤外光などいずれでもよいが、トナー画像の色によって測定感度が変動するのを防止する観点からは可視光以外が好ましく、近赤外の波長を有する光がより好ましい。 The light emitted from the light emitting unit 71 toward the toner image on the paper P is not particularly limited as long as it is parallel light, and may be visible light or infrared light, but the measurement sensitivity varies depending on the color of the toner image. From the viewpoint of preventing light, light other than visible light is preferable, and light having a near-infrared wavelength is more preferable.
測定装置７で測定された光沢度や濃度、表色値などの特性値は制御装置８４（図１に図示）に送られ、所望の光沢度や濃度、表色値となるように、定着ローラ１１の回転駆動、定着温度などの定着条件や、現像バイアス電圧や転写バイアス電圧などの画像形成条件が調整される。 Characteristic values such as glossiness, density, and color value measured by the measuring device 7 are sent to the control device 84 (shown in FIG. 1), and the fixing roller is set so as to obtain desired glossiness, density, and color value. 11 is adjusted for fixing conditions such as rotational driving and fixing temperature, and image forming conditions such as developing bias voltage and transfer bias voltage.
図３に、本発明に係る測定装置の他の実施形態を示す。なお、前記実施形態と同じ部材及び同じ部分には同じ符号を付すこととする。図３に示す測定装置では、第２搬送ローラ対７４が駆動ローラ対であって用紙Ｐを挟持搬送する。一方、第１搬送ローラ対７３は従動ローラ対である。また、送風ファン７５及びダクト７６が、測定基準位置ＳＰよりも用紙搬送方向下流側に設けられている。第２搬送ローラ対７４に用紙Ｐの先端が挟持されたことが、不図示のセンサーによって検知されると、送風ファン７５が起動する。送風ファン７５から送り出される空気は、ダクト７６を通って、用紙搬送方向下流側から上流側に向かって用紙Ｐに対して所定角度で吹き出す。このとき用紙Ｐには、吹き付ける空気によって外方に広がる力がかかり、用紙Ｐが撓むことはない。搬送されてきた用紙Ｐは、ダクト７６から吹き出す空気によって搬送路７９の下側内壁に押し付けられ、内壁に摺接しながら測定基準位置ＳＰを通過する。そして、前記実施形態と同様に、測定基準位置ＳＰにおいて発光部７１から光が照射され、受光部７２でその反射光が受光され、トナー像の光沢度や濃度、表色値などの特性値が測定される。そして、用紙Ｐの後端が第２搬送ローラ対７４を通過すると、送風ファン７５が停止し測定手段による測定が終了する。 FIG. 3 shows another embodiment of the measuring apparatus according to the present invention. In addition, the same code | symbol shall be attached | subjected to the same member and the same part as the said embodiment. In the measuring apparatus shown in FIG. 3, the second conveying roller pair 74 is a driving roller pair, and the sheet P is nipped and conveyed. On the other hand, the first conveying roller pair 73 is a driven roller pair. Further, the blower fan 75 and the duct 76 are provided on the downstream side in the paper transport direction from the measurement reference position SP. When it is detected by a sensor (not shown) that the leading edge of the paper P is sandwiched between the second conveying roller pair 74, the blower fan 75 is activated. The air sent out from the blower fan 75 passes through the duct 76 and blows out at a predetermined angle with respect to the paper P from the downstream side in the paper transport direction toward the upstream side. At this time, the paper P is subjected to a force spreading outward by the air to be blown, and the paper P does not bend. The transported paper P is pressed against the lower inner wall of the transport path 79 by the air blown out from the duct 76, and passes through the measurement reference position SP while sliding on the inner wall. Similarly to the above-described embodiment, light is emitted from the light emitting unit 71 at the measurement reference position SP, and the reflected light is received by the light receiving unit 72, and the characteristic values such as the glossiness, density, and color value of the toner image are obtained. Measured. When the trailing edge of the paper P passes through the second conveying roller pair 74, the blower fan 75 is stopped and the measurement by the measuring unit is finished.
図４に、本発明に係る測定装置のさらに他の実施形態を示す。なお、前記実施形態と同じ部材及び同じ部分には同じ符号を付すこととする。図４は、用紙搬送方向に対して垂直方向（以下、「幅方向」と記すことがある）の断面図である。測定装置７は、送風ファン７５と、送風ファン７５から搬送路７９に向かって幅方向に連続して広がるダクト７６とを有し、ダクト７６内には複数の整流板７６１が設けられている。送風ファン７５から送り出される空気は、ダクト７６によって幅方向に広がるように用紙Ｐに吹き付け、用紙Ｐは、吹き付ける空気によって幅方向に広がった状態で、搬送路７９の下側内壁に押し付けられ、内壁に摺接しながら測定基準位置ＳＰを通過する。そして、前記実施形態と同様に、測定基準位置ＳＰにおいて発光部７１から光が照射され、受光部７２でその反射光が受光され、トナー像の光沢度や濃度、表色値などの特性値が測定される。 FIG. 4 shows still another embodiment of the measuring apparatus according to the present invention. In addition, the same code | symbol shall be attached | subjected to the same member and the same part as the said embodiment. FIG. 4 is a cross-sectional view in a direction perpendicular to the paper conveyance direction (hereinafter, sometimes referred to as “width direction”). The measuring device 7 includes a blower fan 75 and a duct 76 that continuously spreads in the width direction from the blower fan 75 toward the conveyance path 79, and a plurality of rectifying plates 761 are provided in the duct 76. The air sent out from the blower fan 75 is blown against the paper P so as to spread in the width direction by the duct 76, and the paper P is pressed against the lower inner wall of the conveyance path 79 in a state of being spread in the width direction by the blown air. Passing through the measurement reference position SP while sliding on. Similarly to the above-described embodiment, light is emitted from the light emitting unit 71 at the measurement reference position SP, and the reflected light is received by the light receiving unit 72, and the characteristic values such as the glossiness, density, and color value of the toner image are obtained. Measured.
以上説明した実施形態では、発光部７１と受光部７２とを用紙搬送方向に並べて設置していたが、発光部７１と受光部７２とを幅方向に並べて設置してももちろん構わない。 In the embodiment described above, the light emitting unit 71 and the light receiving unit 72 are arranged side by side in the sheet conveyance direction, but it is needless to say that the light emitting unit 71 and the light receiving unit 72 may be arranged side by side in the width direction.
本発明の測定装置は、搬送中の用紙に形成された画像の光沢度や濃度、表色値などの特性を高い精度で測定することができ有用である。 The measuring apparatus of the present invention is useful because it can measure characteristics such as glossiness, density, and color value of an image formed on a sheet being conveyed with high accuracy.
７ 測定装置
Ｐ 用紙
７１ 発光部（測定手段）
７２ 受光部（測定手段）
７３ 第１搬送ローラ対
７４ 第２搬送ローラ対
７５ 送風ファン（送風手段）
７６ ダクト
７９ 搬送路
7 Measuring device P Paper 71 Light emitting part (measuring means)
72 Light receiver (measuring means)
73 1st conveyance roller pair 74 2nd conveyance roller pair 75 Blower fan (blower means)
76 Duct 79 Transport path
Claims (4)
搬送中の用紙に形成された画像の特性を非接触で測定する測定手段と、搬送中の用紙の画像形成面側に空気を吹き付けて、前記測定手段による測定位置において、搬送路の内壁に摺接しながら用紙を移動させる送風手段と、前記測定位置よりも用紙搬送方向上流側及び下流側にそれぞれ設けられ、用紙を挟持して搬送する搬送ローラ対とを備え、
前記搬送ローラ対の一方が駆動ローラ対、もう一方が従動ローラ対であり、
前記駆動ローラ対側から前記従動ローラ対側に向かって用紙に対して所定角度で前記送風手段から空気を吹き付けることを特徴とする測定装置。 An apparatus for measuring the characteristics of an image formed on a sheet being conveyed,
Measuring means for measuring the characteristics of the image formed on the paper being transported in a non-contact manner, and blowing air on the image forming surface side of the paper being transported, and sliding on the inner wall of the transport path at the measurement position by the measuring means. A blower unit that moves the paper while being in contact therewith, and a pair of conveyance rollers that are provided on the upstream side and the downstream side in the paper conveyance direction with respect to the measurement position and convey the paper while sandwiching the paper ,
One of the conveying roller pair is a driving roller pair, and the other is a driven roller pair,
Measuring device according to claim Rukoto blown air from the blower means in a predetermined angle to the sheet toward said driven roller pair side from the drive roller pair side.
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