JP4958418B2 - Image forming apparatus - Google Patents
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Description
本発明は、電子写真式の複写機、プリンタ、ファクシミリ、またはこれらの複合機等の画像形成装置に関し、感光体等の像担持体の駆動を改良したものに関する。 The present invention relates to an image forming apparatus such as an electrophotographic copying machine, a printer, a facsimile, or a composite machine thereof, and more particularly to an improved image carrier such as a photosensitive member.
通常、カラープリンタでは、黒（ＢＫ）単色とフルカラーの二通りの画像形成動作があり、駆動系が独立している場合は、黒（ＢＫ）単色プリントの後にフルカラープリントを取る時に、黒感光体とカラー系感光体の位相を合わせて回転させることが必要である。 Normally, a color printer has two types of image forming operations, black (BK) single color and full color, and when a drive system is independent, a black photosensitive member is used when full color printing is performed after black (BK) single color printing. And the color photoconductor must be rotated in phase.
特許文献１、２等は、各感光体ドラムが独立モータで駆動する場合の位相合せを開示しているが、高価かつ大型化している。特許文献３、４等は、露光位置や転写位置を基準にとって位相合せを行っている。 Patent Documents 1 and 2 disclose phase matching when each photosensitive drum is driven by an independent motor, but are expensive and large. In Patent Documents 3 and 4, etc., phase alignment is performed based on the exposure position and the transfer position.
また特許文献５では、複数の像担持体と、各像担持体上に各色のトナー像を個別に形成する作像手段と、各像担持体毎に形成された各色のトナー像を被転写体上に順次重ね合わせて転写する転写手段と、各像担持体を個別に回転駆動する各像担持体毎に独立した複数の駆動手段とを有し、各駆動手段により駆動回転される各像担持体毎の角度位置情報｛回転位置情報）を検出する複数の角度位置検出手段（回転位置検出手段）と、各角度位置検出手段により検出した各像担持体毎の角度位置情報に基づいて各駆動手段をフィードバック制御する駆動制御手段（制御回路）とを有し、上記角度位置検出手段により検出した少なくとも２つ以上の像担持体の角度位置情報を互いに比較する比較手段（位相比較回路）を有し、該比較手段の比較結果に基づいて、各像担持体の角度位置情報が互いに一致するように、上記駆動制御手段により上記駆動手段をフィードバック制御する画像形成装置が開示されている。 In Patent Document 5, a plurality of image carriers, image forming means for individually forming toner images of each color on each image carrier, and toner images of each color formed for each image carrier are transferred. Each image carrier having a transfer unit that sequentially superimposes the image on the image transfer unit, and a plurality of independent drive units for each image carrier that individually rotates and drives each image carrier. A plurality of angular position detection means (rotational position detection means) for detecting angular position information {rotational position information) for each body, and each drive based on the angular position information for each image carrier detected by each angular position detection means Drive control means (control circuit) for feedback control of the means, and comparison means (phase comparison circuit) for comparing the angular position information of at least two or more image carriers detected by the angular position detection means. And the comparison result of the comparison means Based, as angular position information of each image bearing member coincide with each other, an image forming apparatus for feedback control of the driving means is disclosed by the drive control means.
また特許文献６では、各像担持体を個別に回転駆動する各像担持体毎に独立した複数の駆動手段はＤＣブラシレスモータにて駆動され、一つはカラー系像担持体駆動手段（シアン駆動装置、マゼンダ駆動装置、イエロー駆動装置）で、もう一方はブラック像担持体駆動手段（ブラック駆動装置）である装置や、各像担持体を個別に回転駆動する各像担持体毎に独立した複数の駆動手段はＤＣブラシレスモータにて駆動され、一つはカラー系像担持体駆動手段（シアン駆動装置、マゼンダ駆動装置、イエロー駆動装置）で、もう一方はブラック像担持体駆動手段（ブラック駆動装置）であり、一方又は、両方の駆動手段のスピードを変化させる装置が開示されている。
そのためタンデム型の画像形成装置においては、各感光体の位相にズレが生じた場合に、黒色トナーとカラー系トナー転写時の色ずれや滲み等が発生する不具合がある。 Therefore, in the tandem type image forming apparatus, there is a problem that, when the phase of each photoconductor is shifted, color misregistration or blurring occurs when transferring the black toner and the color toner.
そこで本発明は、モータ立上げ直後に、低コストなフォトセンサーの検出信号に基づき短時間に位相調整を実施し、前記不具合を改善する手段を提供すること目的とする。
Therefore, an object of the present invention is to provide means for improving the above-mentioned problem by performing phase adjustment in a short time based on a low-cost photosensor detection signal immediately after starting up the motor.
本発明の請求項１に係る画像形成装置は、
複数の像担持体と、各像担持体上に各色のトナー像を個別に形成する作像手段と、各像担持体毎に形成された各色のトナー像を被転写体上に順次重ね合わせて転写する転写手段と、各像担持体を個別に回転駆動する各像担持体毎に独立した複数の駆動手段と、被転写体を回転駆動する独立した駆動手段を有し、
各駆動手段により駆動回転される各像担持体毎の偏心角度位置情報を検出する複数の角度位置検出手段と、各角度位置検出手段により検出した各像担持体毎の偏心角度位置情報に基づいて各駆動手段をフィードバック制御する駆動制御手段とを有し、
上記角度位置検出手段により検出した少なくとも２つ以上の像担持体の偏心角度位置情報を互いに比較する比較手段を有し、
該比較手段の比較結果に基づいて、各像担持体の偏心角度位置が互いに一致または近接するように、上記駆動制御手段により上記駆動手段をフィードバック制御する画像形成装置において、
前記駆動手段が、前記複数の像担持体の偏心角度位置を互いに一致または近接させるための偏心角度情報部材を着脱自在に備え、
該偏心角度情報部材が半円形の形状を有し、
前記角度位置情報部材を、組立状態で求めた前記駆動手段の偏心角度の測定結果に応じて該駆動手段に取り付けてなる
ことを特徴とする。
An image forming apparatus according to claim 1 of the present invention includes:
A plurality of image carriers , image forming means for individually forming toner images of each color on each image carrier, and toner images of each color formed for each image carrier are sequentially superimposed on the transfer target. comprising a transfer unit for transferring a plurality of driving means independent for each image bearing member for rotating the respective image carriers individually, independent drive means for rotating the material to be transferred,
Based on a plurality of angular position detecting means for detecting eccentric angular position information for each image carrier driven and rotated by each driving means, and on the eccentric angular position information for each image carrier detected by each angular position detecting means. Drive control means for feedback control of each drive means,
Comparing means for comparing eccentric angular position information of at least two or more image carriers detected by the angular position detecting means with each other;
In the image forming apparatus in which the drive means is feedback-controlled by the drive control means so that the eccentric angle positions of the image carriers coincide with each other or come close to each other based on the comparison result of the comparison means.
The drive means is detachably provided with an eccentric angle information member for causing the eccentric angle positions of the plurality of image carriers to coincide or approach each other .
The eccentric angle information member has a semicircular shape;
The angular position information member, and wherein the Rukoto such attached to the drive means in accordance with the measurement results of the eccentric angle of said driving means obtained in the assembled state.
同請求項２に係るものは、請求項１の画像形成装置において、前記各像担持体を個別に回転駆動するように前記各像担持体毎に独立した複数の駆動手段がＤＣブラシレスモータモータにて駆動され、一がカラー系像担持体駆動手段であり、他がブラック像担持体駆動手段であることを特徴とする。
Those according to the second aspect is the image forming apparatus according to claim 1, wherein the plurality of drive means DC brushless motor motor said independently for each image bearing member so as to rotate the respective image carriers individually driven Te one is a color based image carrier driving means, wherein the other is black image carrier driving means.
同請求項３に係るものは、請求項１または２の画像形成装置において、前記複数の駆動手段の一または両方のスピードを変化させる手段を有することを特徴とする。
Which according to the claim 3 is the image forming apparatus according to claim 1 or 2, characterized Rukoto to have a means for varying one or both of the speed of said plurality of drive means.
本発明は、駆動手段の組付け状態における偏心位置に角度位置情報部材を合せることができ、少なくとも半回転以内に角度位置が検出できるので、低コストで、且つ短時間で位相合せを可能とする。 In the present invention, the angular position information member can be aligned with the eccentric position in the assembled state of the driving means, and the angular position can be detected at least within half rotation, so that phase adjustment can be performed at low cost and in a short time. .
以下本発明を実施するための最良の形態を、図に示す実施例を参照して説明する。 The best mode for carrying out the present invention will be described below with reference to the embodiments shown in the drawings.
図１は、本発明に係る像担持体駆動装置の装着対象となる画像形成装置の作像部付近を示す部分斜視図である。この図において、画像形成装置１の本体フレーム２に、感光体駆動ユニット１０（破線で囲んだ部分）が組み付けられている。この感光体駆動ユニット１０は、本体フレーム２に対して着脱可能に構成されたものである。 FIG. 1 is a partial perspective view showing the vicinity of an image forming unit of an image forming apparatus to which the image carrier driving apparatus according to the present invention is attached. In this figure, a photosensitive member driving unit 10 (portion surrounded by a broken line) is assembled to a main body frame 2 of the image forming apparatus 1. The photoreceptor driving unit 10 is configured to be detachable from the main body frame 2.
図２は、その感光体駆動ユニット１０の平面図である。この図に示すように、感光体駆動ユニット１０は、２枚の側板１１、１２間に後述する感光体駆動ギヤや現像ローラギヤ等を組み込んだ構成となっており、大きく分けて、感光体駆動エリアＡと現像駆動エリアＢの２層構造になっている。また、一方側の側板１１には感光体駆動用モータ１３、１４が装着されている。本例では、第１モータ１３はイエロー（Ｙ）、シアン（Ｃ）、マゼンタ（Ｍ）色用の３つの感光体を駆動するためのモータであり、第２モータ１４はブラック（ＢＫ）感光体専用のモータとしている。ブラック感光体を専用のモータ１４で駆動する理由は、モノクロプリント時にメリットがあるためである。なお、感光体駆動ユニット１０は、図１から判るように、モータ１３、１４が装着されている方の側板１１が装置の外側になり、他方の側板１２が装置内側となるように装置本体に組み付けられる。 FIG. 2 is a plan view of the photosensitive member driving unit 10. As shown in this figure, the photosensitive member driving unit 10 has a structure in which a photosensitive member driving gear, a developing roller gear, etc., which will be described later, are incorporated between the two side plates 11 and 12, and is roughly divided into photosensitive member driving areas. It has a two-layer structure of A and development drive area B. The side plate 11 on one side is equipped with photoreceptor driving motors 13 and 14. In this example, the first motor 13 is a motor for driving three photoreceptors for yellow (Y), cyan (C), and magenta (M), and the second motor 14 is a black (BK) photoreceptor. It is a dedicated motor. The reason why the black photosensitive member is driven by the dedicated motor 14 is that there is a merit in monochrome printing. As can be seen from FIG. 1, the photosensitive member driving unit 10 is attached to the main body of the apparatus such that the side plate 11 on which the motors 13 and 14 are mounted is outside the apparatus and the other side plate 12 is inside the apparatus. Assembled.
図３は、感光体駆動ユニット１０に組み込まれる駆動部品を示す正面図で、図２の下側、すなわち側板１２側から見た状態を示している。この図に示すように、感光体駆動ユニット１０内には大径の感光体駆動ギヤ１５ｙ、ｃ、ｍ、ｂｋが並んで配置されている。図２に示す第１モータ１３の回転軸には図示しないモータギヤが装着されており、そのモータギヤが感光体駆動ギヤ１５ｃと１５ｍとに噛み合わされている。また、感光体駆動ギヤ１５ｃと１５ｙとに噛みあう感光体駆動アイドラギヤ１６が設けられている。これにより、シアンとマゼンタの感光体駆動ギヤ１５ｃ、１５ｍは第１モータ１３により直接駆動され、イエローの感光体駆動ギヤ１５ｙは感光体駆動ギヤ１５ｃからアイドラギヤ１６を介して駆動される。そして、図２の第２モータ１４の回転軸に装着された図示しないモータギヤがブラック用の感光体駆動ギヤ１５ｂｋに噛みあわされ、感光体駆動ギヤ１５ｂｋは第２モータ１４から直接駆動される。各感光体駆動ギヤ１５ｙ、ｃ、ｍ、ｂｋは、感光体駆動ユニット１０を画像形成装置１の本体に組み付けたときに図示しないカップリング手段によりそれぞれイエロー、シアン、マゼンタ及びブラック色用の各感光体ドラム（図示せず）の軸に連結され、各色感光体を駆動する FIG. 3 is a front view showing driving components incorporated in the photosensitive member driving unit 10 and shows a state viewed from the lower side of FIG. 2, that is, the side plate 12 side. As shown in this figure, in the photosensitive member driving unit 10, large-diameter photosensitive member driving gears 15y, c, m, bk are arranged side by side. A motor gear (not shown) is mounted on the rotation shaft of the first motor 13 shown in FIG. 2, and the motor gear is engaged with the photosensitive member driving gears 15c and 15m. Further, a photosensitive member drive idler gear 16 that meshes with the photosensitive member drive gears 15c and 15y is provided. As a result, the cyan and magenta photosensitive member driving gears 15c and 15m are directly driven by the first motor 13, and the yellow photosensitive member driving gear 15y is driven from the photosensitive member driving gear 15c via the idler gear 16. A motor gear (not shown) mounted on the rotation shaft of the second motor 14 in FIG. 2 is engaged with the black photosensitive member driving gear 15 bk, and the photosensitive member driving gear 15 bk is directly driven from the second motor 14. The photosensitive member driving gears 15y, c, m, and bk are respectively exposed to yellow, cyan, magenta, and black colors by coupling means (not shown) when the photosensitive member driving unit 10 is assembled to the main body of the image forming apparatus 1. Connected to the shaft of a body drum (not shown) to drive each color photoconductor
現像駆動エリアＢに属する駆動部品としては、現像ローラギヤ１７（ｙ、ｃ、ｍ、ｂｋ）、アイドルギヤ列１８〜２０、タイミングギヤ２１（ｙ、ｃ）、タイミングベルト２２及び伝達ギヤ２３等があり、これらが感光体駆動ユニット１０に組み込まれている。また、クラッチギヤ２４及び伝達ギヤ２５も感光体駆動ユニット１０に搭載されている。現
像駆動モータ３０及びその駆動軸に装着された現像モータギヤ３１は画像形成装置の本体側に配設されたものである。
The drive parts belonging to the development drive area B include the development roller gear 17 (y, c, m, bk), the idle gear trains 18 to 20, the timing gear 21 (y, c), the timing belt 22, the transmission gear 23, and the like. These are incorporated in the photosensitive member driving unit 10. Further, the clutch gear 24 and the transmission gear 25 are also mounted on the photosensitive member driving unit 10. The development drive motor 30 and the development motor gear 31 attached to the drive shaft are disposed on the main body side of the image forming apparatus.
ブラック（ＢＫ）色用の現像駆動列は他の３色の現像駆動列とは独立しており、第２モータ１４のモータギヤに噛みあわされる伝達ギヤ２５から現像クラッチ（図ではクラッチギヤ２４）及びアイドルギヤ列２０ｂｋ、１９ｂ、１８ｂｋを経て最終の現像ローラギヤ１７ｂｋに駆動力が伝達される。 The development drive train for black (BK) color is independent of the development drive trains for the other three colors. From the transmission gear 25 meshed with the motor gear of the second motor 14, a development clutch (clutch gear 24 in the figure) and The driving force is transmitted to the final developing roller gear 17bk through the idle gear trains 20bk, 19b, and 18bk.
イエロー（Ｙ）、シアン（Ｃ）、マゼンタ（Ｍ）の現像駆動列は、感光体駆動ユニット１０を本体装置に組み付けたときに現像駆動モータ３０のモータギヤ３１に噛み合わされる伝達ギヤ２３から、マゼンタ色においてはアイドルギヤ列１８〜２０を経て最終の現像ローラギヤ１７ｍに駆動力が伝達される。シアン色においては伝達ギヤ２３からタイミングギヤ２１ｃ及びアイドルギヤ列１８、１９を経て最終の現像ローラギヤ１７ｃに駆動力が伝達される。またイエロー色においては、伝達ギヤ２３からタイミングギヤ２１ｃ、２１ｙとタイミングベルト２２及びアイドルギヤ列１８、１９を経て最終の現像ローラギヤ１７ｙに駆動力が伝達される。タイミングギヤ２１ｃ、２１ｙは同軸上にタイミングベルト２２が掛け渡されるタイミングプーリが設けられており、これによりタイミングギヤ２１ｃから２１ｙに駆動力が伝達される。 The yellow (Y), cyan (C), and magenta (M) development drive trains start from the transmission gear 23 that meshes with the motor gear 31 of the development drive motor 30 when the photosensitive member drive unit 10 is assembled to the main body device. In color, the driving force is transmitted to the final developing roller gear 17m through the idle gear trains 18-20. In the cyan color, the driving force is transmitted from the transmission gear 23 to the final developing roller gear 17c through the timing gear 21c and the idle gear trains 18 and 19. In the yellow color, the driving force is transmitted from the transmission gear 23 to the final developing roller gear 17y through the timing gears 21c and 21y, the timing belt 22 and the idle gear trains 18 and 19. The timing gears 21c and 21y are provided with a timing pulley on which the timing belt 22 is laid on the same axis, whereby the driving force is transmitted from the timing gear 21c to 21y.
各色用の現像ローラギヤ１７（ｙ、ｃ、ｍ、ｂｋ）は、感光体駆動ユニット１０を画像形成装置１の本体に組み付けたときに、本体内に備えられた図示しない伝達ギヤに噛み合うように構成されており、その伝達ギヤを介して現像装置を駆動する。 The developing roller gears 17 (y, c, m, bk) for the respective colors are configured to mesh with transmission gears (not shown) provided in the main body when the photosensitive member driving unit 10 is assembled to the main body of the image forming apparatus 1. The developing device is driven via the transmission gear.
上記のように構成された感光体駆動ユニット１０においては、感光体駆動ユニットの状態で各感光体駆動ギヤ１５の平行度や直角度、あるいは位相合わせ等の調整がなされた状態でユニットとして完成されている。したがって、この感光体駆動ユニット１０を画像形成装置本体に組み付けた後ではそれらの調整は不要であるため、従来の感光体駆動装置のように本体組み付け後に調整を行う手間が省け、また、感光体駆動装置としての精度を高いレベルで保持することができる。したがって、各色感光体における色ズレ及び濃度ムラを抑制することができ、高品質な画像を得ることができる。なお、感光体駆動ユニット内における各種調整を行うための構成及び方法は、公知のものを適宜採用しえるため、ここでは説明を省略する。 The photoconductor drive unit 10 configured as described above is completed as a unit in a state where the parallelism, squareness, phase alignment, etc. of each photoconductor drive gear 15 are adjusted in the state of the photoconductor drive unit. ing. Therefore, after the photosensitive member driving unit 10 is assembled to the main body of the image forming apparatus, it is not necessary to adjust them, so that it is not necessary to make adjustments after assembling the main body as in the conventional photosensitive member driving device. The accuracy of the driving device can be maintained at a high level. Therefore, color misregistration and density unevenness in each color photoconductor can be suppressed, and a high-quality image can be obtained. In addition, since a well-known thing can be suitably employ | adopted for the structure and method for performing various adjustments in a photoconductor drive unit, description is abbreviate | omitted here.
また、画像形成装置本体に着脱可能な感光体駆動装置においては、ユニット内に感光体駆動部品が使用しないデッドスペースが多少なりとも存在するものである。そこで、本発明においては、上述のように感光体駆動ユニット１０内のスペースを有効に活用して、現像装置を駆動するための駆動列をユニット内に配設している。これにより、従来、画像形成装置の本体においてスペースを占めていた現像駆動列を感光体駆動ユニットのデッドスペースに配置することができ、画像形成装置の小型化に寄与することができる。また、感光体駆動列と同様に、駆動ユニットを装置本体に取り付けた後での現像駆動列の調整は不要であり、精度が要求される感光体と現像装置の関係において、各駆動列の寸法精度を高いレベルで容易に維持することができる。したがって、現像品質の向上と維持を図ることができる。 Further, in the photosensitive member driving device that can be attached to and detached from the image forming apparatus main body, there is some dead space in the unit that is not used by the photosensitive member driving component. Therefore, in the present invention, as described above, the drive train for driving the developing device is arranged in the unit by effectively utilizing the space in the photosensitive member drive unit 10. As a result, the development drive train that conventionally occupies space in the main body of the image forming apparatus can be arranged in the dead space of the photosensitive member drive unit, which contributes to downsizing of the image forming apparatus. Similarly to the photosensitive member drive train, it is not necessary to adjust the development drive train after the drive unit is attached to the apparatus main body. The accuracy can be easily maintained at a high level. Therefore, the development quality can be improved and maintained.
ところで、本例の感光体駆動ユニット１０においては、上述したようにブラック（ＢＫ）色用の現像駆動列は他の３色の現像駆動列とは独立しており、その現像駆動列中に現像クラッチを配している。図４には、感光体駆動ユニット１０に装着された現像クラッチ２６を示してある。この現像クラッチ２６は、図５に示すように、軸受２７及びクラッチカバー２８を取り外すことにより、ユニット１０から取り外せるように構成されている。 By the way, in the photosensitive member drive unit 10 of this example, as described above, the development drive train for black (BK) is independent of the other three color development drive trains, and development is performed in the development drive train. The clutch is arranged. FIG. 4 shows the developing clutch 26 attached to the photosensitive member driving unit 10. As shown in FIG. 5, the developing clutch 26 is configured to be removed from the unit 10 by removing the bearing 27 and the clutch cover 28.
使用頻度の高いブラック色において、現像駆動列中にクラッチを配したことにより、必要時にのみ現像装置を駆動することができ、現像剤の寿命や現像装置を構成する部品の寿命を延ばすことができる。また、電力を効率良く使用することも可能である。 In the black color that is frequently used, by arranging the clutch in the development drive train, the development device can be driven only when necessary, and the life of the developer and the parts constituting the development device can be extended. . It is also possible to use power efficiently.
そして、感光体駆動ユニット１０を分解したり、側板１１あるいは１２を外すことなく現像クラッチ２６をユニット１０から取り外せるので、感光体駆動ユニット１０の完成時に設定された各色感光体駆動ギヤの位相関係や軸の平行度・直角度などに影響を与えずに現像クラッチを交換することができる。 Since the developing clutch 26 can be removed from the unit 10 without disassembling the photosensitive member driving unit 10 or without removing the side plate 11 or 12, the phase relationship of each color photosensitive member driving gear set when the photosensitive member driving unit 10 is completed or The developing clutch can be exchanged without affecting the parallelism and perpendicularity of the shaft.
図６は、本発明に係る像担持体駆動装置が備える感光体駆動ギヤ１５の斜視図、図７はその平面図である。この実施例では、感光体駆動ギヤ１５と駆動軸１０４が同軸となるよう圧入し、駆動軸１０４の端部にはジョイント１０２を配し感光体ドラム側のジョイントに接続する。図示しない並行ピンにより感光体駆動ギヤ１５から駆動軸１０４へ動力を伝え、図示しない並行ピンにより駆動軸１０４からジョイント１０２へ動力を伝える。駆動軸１０４は、感光体駆動ギヤ１５を挟むようにスベリ軸受１０３ａと玉軸受１０３ｂで支持している。 FIG. 6 is a perspective view of the photoreceptor driving gear 15 provided in the image carrier driving apparatus according to the present invention, and FIG. 7 is a plan view thereof. In this embodiment, the photosensitive member driving gear 15 and the driving shaft 104 are press-fitted so as to be coaxial, and a joint 102 is disposed at the end of the driving shaft 104 and connected to the joint on the photosensitive drum side. Power is transmitted from the photosensitive member drive gear 15 to the drive shaft 104 by a parallel pin (not shown), and power is transmitted from the drive shaft 104 to the joint 102 by a parallel pin (not shown). The drive shaft 104 is supported by a sliding bearing 103a and a ball bearing 103b so as to sandwich the photoreceptor driving gear 15.
このように駆動源から感光体駆動ギヤ１５を介して感光体ドラムへ動力を伝えるのであるが、感光体駆動ギヤ１５自身の偏心、感光体駆動ギヤ１５と駆動軸１０４の圧入部の偏心、駆動軸１０４とスベリ軸受１０３ａとの隙間による偏心、駆動軸１０４と玉軸受１０３ｂとの圧入部の偏心、駆動軸１０４とジョイント１０２の偏心というように様々な偏心要因を持っている。 In this way, power is transmitted from the driving source to the photosensitive drum via the photosensitive member driving gear 15, but the eccentricity of the photosensitive member driving gear 15 itself, the eccentricity of the press-fitting portion between the photosensitive member driving gear 15 and the driving shaft 104, and driving. There are various eccentric factors such as eccentricity due to the gap between the shaft 104 and the sliding bearing 103a, eccentricity of the press-fitting portion between the driving shaft 104 and the ball bearing 103b, and eccentricity of the driving shaft 104 and the joint 102.
そこで、図８のような構成の偏心計測治具を用いて感光体駆動手段(組立状態)の偏心角度を求める。１０７は偏心計測装置、１０８は受け台である。 Therefore, the eccentric angle of the photosensitive member driving means (assembled state) is obtained using an eccentricity measuring jig having a configuration as shown in FIG. Reference numeral 107 denotes an eccentricity measuring device, and 108 denotes a cradle.
測定結果を図９に示す。図９中に矢印Ｄで示した位置を求め、図１０のように角度位置情報部材１０６を駆動ギヤ１５の図中矢印Ｃで示す部位と図９のＤ部とが一致するように取り付ける。図８の偏心測定治具では、偏心要因の中でも大きい感光体駆動ギヤ１５自身の偏心、感光体駆動ギヤ１５と駆動軸１０４の圧入部の偏心、駆動軸１０４とスベリ軸受１０３ａとの隙間による偏心、駆動軸１０４と玉軸受１０３ｂとの圧入部の偏心が合成された偏心角度情報が得られ、角度位置情報部材１０６を偏心角度情報に合せて組付けることが可能となる。これにより、各感光体の駆動手段側の位相を精度良く合せることが可能となる。 The measurement results are shown in FIG. The position indicated by the arrow D in FIG. 9 is obtained, and the angular position information member 106 is attached so that the portion indicated by the arrow C in the drawing and the portion D in FIG. In the eccentricity measuring jig of FIG. 8, the eccentricity of the photosensitive member driving gear 15 itself, the eccentricity of the press-fitting portion between the photosensitive member driving gear 15 and the driving shaft 104, and the eccentricity due to the gap between the driving shaft 104 and the sliding bearing 103a are large. The eccentric angle information obtained by synthesizing the eccentricity of the press-fitting portion between the drive shaft 104 and the ball bearing 103b is obtained, and the angular position information member 106 can be assembled according to the eccentric angle information. As a result, it is possible to accurately match the phase of each photoconductor on the drive means side.
角度位置情報部材１０６が着脱可能で半円状なので、像担持体駆動装置としての組付け状態における偏心位置に角度位置情報部材を合せることができ、少なくとも半回転以内に角度位置が検出できるので、低コストで、且つ短時間で位相合せが可能になる。 Since the angular position information member 106 is detachable and semicircular, the angular position information member can be aligned with the eccentric position in the assembled state as the image carrier driving device, and the angular position can be detected at least within half rotation. Phase alignment is possible at a low cost and in a short time.
また、カラー系駆動手段及び黒系駆動手段の駆動源にそれぞれ一つずつＤＣブラシレスモータを用いる構成とすれば、回転精度や低騒音に優れ、低コストで、且つ短時間で位相合せが可能になる。 In addition, if one DC brushless motor is used for each of the color system driving means and the black system driving means, the rotational accuracy and noise are excellent, and phase adjustment is possible at a low cost and in a short time. Become.
さらに、カラー系駆動モータと黒系駆動モータのそれぞれを独立して回転数を変更すれば、低コストで、且つ短時間で位相合せが可能になる。 Furthermore, if the rotation speed is changed independently for each of the color drive motor and the black drive motor, the phase alignment can be performed at a low cost and in a short time.
また一方のモータ回転数を固定して、もう一方のモータの回転数を可変にすると限られた時間で位相合わせするには、その可変量が大きくなり感光体周速度も大幅に変わり、すると、感光体表面と中間転写ベルト表面との周速度差も大きくなるため、位相合わせ時間は短時間であるが摩擦も増え、互いの表面にキズが入りやすくなる。よって両方のモータの回転数を調整可能として、短時間に周速度差を小さくし、キズが入るリスクを小さくすることができる。 In addition, if the rotation speed of one motor is fixed and the rotation speed of the other motor is made variable, the variable amount increases and the photosensitive member peripheral speed also changes drastically. Since the difference in peripheral speed between the surface of the photoreceptor and the surface of the intermediate transfer belt is also increased, the phase alignment time is short, but the friction is increased, and the surfaces are easily scratched. Therefore, the rotational speeds of both motors can be adjusted, the peripheral speed difference can be reduced in a short time, and the risk of scratches can be reduced.
なお、本例の感光体駆動ユニット１０が装着された画像形成装置１は、電子写真方式を採用した４連タンデム型のカラー画像形成装置であり、その基本的構成と画像形成動作については従来周知なものと同様であるので、説明を省略する。 The image forming apparatus 1 to which the photosensitive member driving unit 10 of this example is attached is a four-tandem color image forming apparatus adopting an electrophotographic method, and its basic configuration and image forming operation are conventionally known. The explanation is omitted because it is similar to the above.
以上、本発明を図示例により説明したが、本発明はこれに限定されるものではない。感光体駆動列及び現像装置駆動列の構成は適宜変更しえるものである。また、４連タンデムに限らず、３色あるいは他の色数の感光体駆動装置にも本発明を適用可能である。また、画像形成装置としてはプリンタ、複写機、ファクシミリあるいはそれらの機能を兼ねる複合機であっても構わない。 As mentioned above, although this invention was demonstrated by the example of illustration, this invention is not limited to this. The configurations of the photosensitive member drive train and the developing device drive train can be changed as appropriate. Further, the present invention is not limited to quadruple tandem but can be applied to a photosensitive member driving device of three colors or other colors. Further, the image forming apparatus may be a printer, a copier, a facsimile, or a complex machine having both functions.
１ 画像形成装置
１０ 感光体駆動ユニット
１１、１２ 側板
１３、１４ 感光体駆動用モータ
１５ 感光体駆動ギヤ
１６ 感光体駆動アイドラギヤ
２２ タイミングベルト
２６ 現像クラッチ
２７ 軸受
２８ クラッチカバー
３０ 現像駆動モータ
１０２ 駆動ジョイント
１０３ａ スベリ軸受
１０３ｂ 玉軸受
１０４ 駆動軸
１０５ 圧縮スプリング
１０６ 角度位置情報部材
１０７ 偏心計測装置
１０８ 受け台
DESCRIPTION OF SYMBOLS 1 Image forming apparatus 10 Photoconductor drive unit 11, 12 Side plate 13, 14 Photoconductor drive motor 15 Photoconductor drive gear 16 Photoconductor drive idler gear 22 Timing belt 26 Development clutch 27 Bearing 28 Clutch cover 30 Development drive motor 102 Drive joint 103a Slide bearing 103b Ball bearing 104 Drive shaft 105 Compression spring 106 Angular position information member 107 Eccentricity measuring device 108 Receiving base
Claims (3)
各駆動手段により駆動回転される各像担持体毎の偏心角度位置情報を検出する複数の角度位置検出手段と、各角度位置検出手段により検出した各像担持体毎の偏心角度位置情報に基づいて各駆動手段をフィードバック制御する駆動制御手段とを有し、
上記角度位置検出手段により検出した少なくとも２つ以上の像担持体の偏心角度位置情報を互いに比較する比較手段を有し、
該比較手段の比較結果に基づいて、各像担持体の偏心角度位置が互いに一致または近接するように、上記駆動制御手段により上記駆動手段をフィードバック制御する画像形成装置において、
前記駆動手段が、前記複数の像担持体の偏心角度位置を互いに一致または近接させるための偏心角度情報部材を着脱自在に備え、
該偏心角度情報部材が半円形の形状を有し、
前記角度位置情報部材を、組立状態で求めた前記駆動手段の偏心角度の測定結果に応じて該駆動手段に取り付けてなる
ことを特徴とする画像形成装置。 A plurality of image carriers , image forming means for individually forming toner images of each color on each image carrier, and toner images of each color formed for each image carrier are sequentially superimposed on the transfer target. comprising a transfer unit for transferring a plurality of driving means independent for each image bearing member for rotating the respective image carriers individually, independent drive means for rotating the material to be transferred,
Based on a plurality of angular position detecting means for detecting eccentric angular position information for each image carrier driven and rotated by each driving means, and on the eccentric angular position information for each image carrier detected by each angular position detecting means. Drive control means for feedback control of each drive means,
Comparing means for comparing eccentric angular position information of at least two or more image carriers detected by the angular position detecting means with each other;
In the image forming apparatus in which the drive means is feedback-controlled by the drive control means so that the eccentric angle positions of the image carriers coincide with each other or come close to each other based on the comparison result of the comparison means.
The drive means is detachably provided with an eccentric angle information member for causing the eccentric angle positions of the plurality of image carriers to coincide or approach each other .
The eccentric angle information member has a semicircular shape;
The angular position information element, the image forming apparatus according to claim Rukoto such attached to the drive means in accordance with the measurement results of the eccentric angle of said driving means obtained in the assembled state.
前記各像担持体を個別に回転駆動するように前記各像担持体毎に独立した複数の駆動手段がＤＣブラシレスモータモータにて駆動され、一がカラー系像担持体駆動手段であり、他がブラック像担持体駆動手段であることを特徴とする画像形成装置。 The image forming apparatus according to claim 1.
A plurality of independent drive means for each image carrier is driven by a DC brushless motor motor so as to rotate and drive each image carrier individually , one is a color image carrier drive means, and the other is An image forming apparatus which is a black image carrier driving means .
The image forming apparatus according to claim 1 or 2, the image forming apparatus according to claim Rukoto to have a means for varying one or both of the speed of said plurality of drive means.
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