JP7390564B2 - Band drive device, transfer device, and image forming device - Google Patents

Band drive device, transfer device, and image forming device Download PDF

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JP7390564B2
JP7390564B2 JP2019191933A JP2019191933A JP7390564B2 JP 7390564 B2 JP7390564 B2 JP 7390564B2 JP 2019191933 A JP2019191933 A JP 2019191933A JP 2019191933 A JP2019191933 A JP 2019191933A JP 7390564 B2 JP7390564 B2 JP 7390564B2
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band
rotating
driving device
circumferential surface
transfer
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JP2021067768A (en
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大輔 田中
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/02—Feeding articles separated from piles; Feeding articles to machines by belts or chains, e.g. between belts or chains
    • B65H5/021—Feeding articles separated from piles; Feeding articles to machines by belts or chains, e.g. between belts or chains by belts
    • B65H5/023—Feeding articles separated from piles; Feeding articles to machines by belts or chains, e.g. between belts or chains by belts between a pair of belts forming a transport nip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/02—Feeding articles separated from piles; Feeding articles to machines by belts or chains, e.g. between belts or chains
    • B65H5/021—Feeding articles separated from piles; Feeding articles to machines by belts or chains, e.g. between belts or chains by belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/20—Belt drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/20—Belts
    • B65H2404/22—Cross section profile
    • B65H2404/222—Flat belt
    • B65H2404/2222—Flat belt with protrusions on inner side; Beads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/20—Belts
    • B65H2404/22—Cross section profile
    • B65H2404/224—Cross section profile details of edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/20—Belts
    • B65H2404/25—Driving or guiding arrangements
    • B65H2404/254—Arrangement for varying the guiding or transport length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2404/00—Parts for transporting or guiding the handled material
    • B65H2404/20—Belts
    • B65H2404/25—Driving or guiding arrangements
    • B65H2404/256—Arrangement of endless belt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/03—Image reproduction devices
    • B65H2801/06—Office-type machines, e.g. photocopiers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Cleaning In Electrography (AREA)

Description

本発明は、帯駆動装置、転写装置、および画像形成装置に関する。 The present invention relates to a band drive device, a transfer device, and an image forming device.

環状に繋がった帯部材が複数の回転部材に掛け回されて駆動される装置において、帯部材が回転部材に掛かっている位置が回転部材の軸に沿う方向に移動することを抑制するため、帯部材の縁に沿って延びた突出体（リブ）が設けられた構成が知られている。 In a device in which an annularly connected band member is wound around a plurality of rotating members and driven, the band member is used to prevent the position where the band member is hung on the rotating member from moving in the direction along the axis of the rotating member. A configuration is known in which a protrusion (rib) is provided extending along the edge of the member.

特許文献１には、ベルトの寄りを防止するため、転写ベルトが幅方向端部の周方向にリブを有し、転写ベルトが接している部分の幅方向の長さが最大である張架ローラが従動ローラになっている画像形成装置が開示されている。 Patent Document 1 discloses a tension roller in which the transfer belt has ribs in the circumferential direction at the ends in the width direction in order to prevent the belt from shifting, and the length in the width direction of the portion in contact with the transfer belt is the maximum. An image forming apparatus is disclosed in which the roller is a driven roller.

特開２００２－３３３７７９号公報Japanese Patent Application Publication No. 2002-333779

本発明は、突出体が回転部材に乗り上げることによる帯部材の損傷を抑制することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to suppress damage to a band member caused by a protruding body riding on a rotating member.

請求項１に係る帯駆動装置は、
環状に繋がった帯部材と、
互いに並んで延びて各々が回転し、上記帯部材が掛け回されて循環移動する複数の回転部材と、
上記帯部材の内周面から突出し、当該帯部材の縁に沿って延び、上記回転部材の延伸方向で当該回転部材に並んだ突出体と、
板状の部分を有し、上記帯部材を挟んで上記回転部材と対向した箇所で当該帯部材の外周面に当該板状の部分が接触して当該外周面から不要物を除去する、上記延伸方向に上記回転部材の端部よりも外側まで延びた除去部材とを備え、
前記除去部材は、前記複数の回転部材のうち、駆動力を受けて回転することで当該除去部材を駆動する回転部材と、前記帯部材を挟んで対向することを特徴とする。 The band driving device according to claim 1 includes:
A belt member connected in a ring,
a plurality of rotating members extending side by side with each other, each of which rotates, and around which the band member is wrapped around and moves in circulation;
a protruding body that protrudes from the inner circumferential surface of the band member, extends along the edge of the band member, and is lined up with the rotating member in the extending direction of the rotating member;
The above-mentioned stretching has a plate-shaped portion, and the plate-shaped portion contacts the outer circumferential surface of the band member at a location facing the rotating member with the band member interposed therebetween to remove unnecessary materials from the outer circumferential surface. a removal member extending outward from the end of the rotating member in the direction ;
The removing member is characterized in that it faces a rotating member of the plurality of rotating members that drives the removing member by rotating in response to a driving force, with the band member interposed therebetween.

請求項２に係る帯駆動装置は、請求項１の帯駆動装置において、
上記除去部材は、上記延伸方向における央部よりも端部の方が上記外周面に強く接触することを特徴とする。
請求項３に係る帯駆動装置は、請求項１または２の帯駆動装置において、
上記除去部材は、上記延伸方向における央部よりも端部の方が高い剛性を有することを特徴とする。 The band driving device according to claim 2 is the band driving device according to claim 1, comprising:
The removing member is characterized in that an end portion of the removing member contacts the outer circumferential surface more strongly than a central portion in the stretching direction.
The band driving device according to claim 3 is the band driving device according to claim 1 or 2, comprising:
The removal member is characterized in that the end portions have higher rigidity than the center portion in the stretching direction.

請求項４に係る帯駆動装置は、請求項２または３の帯駆動装置において、
上記除去部材は、部分的な表面処理によって上記央部よりも上記端部の方が硬いことを特徴とする。
請求項５に係る帯駆動装置は、請求項４の帯駆動装置において、
上記除去部材は、上記帯部材との接触部分にも上記表面処理が施されていることを特徴とする。 The band driving device according to claim 4 is the band driving device according to claim 2 or 3, comprising:
The removal member is characterized in that the end portion is harder than the center portion due to partial surface treatment.
The band driving device according to claim 5 is the band driving device according to claim 4, comprising:
The removal member is characterized in that the surface treatment is also applied to the portion in contact with the band member.

請求項６に係る帯駆動装置は、請求項２または３の帯駆動装置において、
上記除去部材は、上記帯部材の外周面と接触する第１部分と、上記第１部分を保持し当該第１部分よりも高い剛性を有する第２部分とを有し、
上記第２部分は、上記央部よりも上記端部の方が上記外周面との距離が短いことを特徴とする。
請求項７に係る帯駆動装置は、請求項２または３の帯駆動装置において、
上記除去部材は、上記央部よりも上記端部の方が厚いことを特徴とする。 The band driving device according to claim 6 is the band driving device according to claim 2 or 3, comprising:
The removal member has a first portion that contacts the outer peripheral surface of the band member, and a second portion that holds the first portion and has higher rigidity than the first portion,
The second portion is characterized in that the distance between the end portion and the outer circumferential surface is shorter than that between the center portion and the outer circumferential surface.
The band driving device according to claim 7 is the band driving device according to claim 2 or 3, comprising:
The removal member is characterized in that the end portion is thicker than the center portion.

請求項８に係る帯駆動装置は、請求項２または３の帯駆動装置において、
上記除去部材は、上記回転部材の端面位置から上記延伸方向に上記突出体の幅分だけ外側の第１箇所よりも内側に、上記央部と上記端部との境界が位置することを特徴とする。
請求項９に係る帯駆動装置は、請求項２または３の帯駆動装置において、
上記除去部材は、上記回転部材の端面位置から上記延伸方向に上記突出体の幅分だけ内側の第２箇所よりも外側に、上記央部と上記端部との境界が位置することを特徴とする。 The band driving device according to claim 8 is the band driving device of claim 2 or 3, comprising:
The removal member is characterized in that the boundary between the center portion and the end portion is located inside a first location that is outside a first location by the width of the protrusion in the stretching direction from the end surface position of the rotating member. do.
The band driving device according to claim 9 is the band driving device according to claim 2 or 3, comprising:
The removal member is characterized in that the boundary between the center portion and the end portion is located outside of a second location that is located inside by the width of the protrusion in the stretching direction from the end face position of the rotating member. do.

請求項１０に係る帯駆動装置は、請求項１から９の帯駆動装置において、
上記除去部材は、上記複数の回転部材のうち、上記帯部材の位置を上記延伸方向に変更する力が最も強い回転部材と、上記帯部材を挟んで対向することを特徴とする。
請求項１１に係る帯駆動装置は、請求項１０の帯駆動装置において、
上記除去部材は、上記複数の回転部材のうち、上記延伸方向の長さが最も長い回転部材と、上記帯部材を挟んで対向することを特徴とする。 A band driving device according to claim 10 is a band driving device according to any one of claims 1 to 9, comprising:
The removing member is characterized in that it faces a rotating member having the strongest force for changing the position of the band member in the stretching direction among the plurality of rotating members, with the band member interposed therebetween.
The band driving device according to claim 11 is the band driving device according to claim 10, comprising:
The removing member is characterized in that it faces the rotating member having the longest length in the stretching direction among the plurality of rotating members, with the band member interposed therebetween.

請求項１２に係る帯駆動装置は、請求項１０または１１の帯駆動装置において、
上記除去部材は、上記複数の回転部材のうち最も太い回転部材と、上記帯部材を挟んで対向することを特徴とする。 The band driving device according to claim 12 is the band driving device according to claim 10 or 11, comprising:
The removing member is characterized in that it faces the thickest rotating member among the plurality of rotating members, with the band member interposed therebetween.

請求項１３に係る転写装置は、
環状に繋がり、外周面が記録材に接触し、電圧の印加を受けることで当該記録材上に画像を転写する帯部材と、
互いに並んで延びて各々が回転し、上記帯部材が掛け回されて循環移動する複数の回転部材と、
上記帯部材の内周面から突出し、当該帯部材の縁に沿って延び、上記回転部材の延伸方向で当該回転部材に並んだ突出体と、
板状の外形を有し、上記帯部材を挟んで上記回転部材と対向した箇所で当該帯部材の外周面に接触して当該外周面から不要物を除去する、上記延伸方向に上記回転部材の端部よりも外側まで延びた除去部材とを備え、
前記除去部材は、前記複数の回転部材のうち、駆動力を受けて回転することで当該除去部材を駆動する回転部材と、前記帯部材を挟んで対向することを特徴とする。 The transfer device according to claim 13 includes:
a belt member connected in a ring shape, whose outer peripheral surface contacts a recording material, and transfers an image onto the recording material by receiving a voltage;
a plurality of rotating members extending side by side with each other, each of which rotates, and around which the band member is wrapped around and moves in circulation;
a protruding body that protrudes from the inner circumferential surface of the band member, extends along the edge of the band member, and is lined up with the rotating member in the extending direction of the rotating member;
The rotary member has a plate-like outer shape and contacts the outer circumferential surface of the band member at a location opposite to the rotating member across the band member to remove unnecessary materials from the outer circumferential surface of the rotating member in the stretching direction. and a removal member extending outward from the end ,
The removing member is characterized in that it faces a rotating member of the plurality of rotating members that drives the removing member by rotating in response to a driving force, with the band member interposed therebetween.

請求項１４に係る画像形成装置は、
記録材を搬送する搬送部と、
上記搬送部によって搬送される記録材に画像を形成する画像形成部と、
上記搬送部および上記画像形成部の少なくとも一方に組み込まれた帯駆動装置と、を備え、
上記帯駆動装置が、
環状に繋がった帯部材と、
互いに並んで延びて各々が回転し、上記帯部材が掛け回されて循環移動する複数の回転部材と、
上記帯部材の内周面から突出し、当該帯部材の縁に沿って延び、上記回転部材の延伸方向で当該回転部材に並んだ突出体と、
板状の外形を有し、上記帯部材を挟んで上記回転部材と対向した箇所で当該帯部材の外周面に接触して当該外周面から不要物を除去する、上記延伸方向に上記回転部材の端部よりも外側まで延びた除去部材とを備え、
前記除去部材は、前記複数の回転部材のうち、駆動力を受けて回転することで当該除去部材を駆動する回転部材と、前記帯部材を挟んで対向することを特徴とする。 The image forming apparatus according to claim 14 includes:
a conveyance unit that conveys the recording material;
an image forming section that forms an image on a recording material transported by the transport section;
a band driving device incorporated in at least one of the transport section and the image forming section;
The band driving device is
A belt member connected in a ring,
a plurality of rotating members extending side by side with each other, each of which rotates, and around which the band member is wrapped around and moves in circulation;
a protruding body that protrudes from the inner circumferential surface of the band member, extends along the edge of the band member, and is lined up with the rotating member in the extending direction of the rotating member;
The rotary member has a plate-like outer shape and contacts the outer circumferential surface of the band member at a location opposite to the rotating member across the band member to remove unnecessary materials from the outer circumferential surface of the rotating member in the stretching direction. and a removal member extending outward from the end ,
The removing member is characterized in that it faces a rotating member of the plurality of rotating members that drives the removing member by rotating in response to a driving force, with the band member interposed therebetween.

請求項１に係る帯駆動装置、請求項１３に係る転写装置、および請求項１４に係る画像形成装置によれば、突出体が回転部材に乗り上げることによる帯部材の損傷を抑制することができる。
また、請求項１に係る帯駆動装置、請求項１３に係る転写装置、および請求項１４に係る画像形成装置によれば、除去部材が他の回転部材と対向する場合に較べて帯部材の偏倚を抑制することができる。
請求項２に係る帯駆動装置によれば、央部と端部で接触の強さが同じ場合に較べ、突出体の乗り上げを抑制することができる。
請求項３に係る帯駆動装置によれば、央部と端部で剛性が同じ場合に較べ、突出体の乗り上げを抑制することができる。
請求項４に係る帯駆動装置によれば、央部と端部で硬さが同じ場合に較べ、突出体の乗り上げを抑制することができる。
請求項５に係る帯駆動装置によれば、接触部分に前記表面処理が施されていない場合に較べて帯との摩擦が小さい。
請求項６に係る帯駆動装置によれば、央部と端部で距離が同じ場合に較べ、突出体の乗り上げを抑制することができる。
請求項７に係る帯駆動装置によれば、央部と端部で厚さが同じ場合に較べ、突出体の乗り上げを抑制することができる～することができる。
請求項８に係る帯駆動装置によれば、第１箇所より外側に境界が位置する場合に較べ、突出体の乗り上げを抑制することができる。
請求項９に係る帯駆動装置によれば、第２箇所より内側に境界が位置する場合に較べ、クリーニング性が優れている。
請求項１０に係る帯駆動装置によれば、除去部材が他の回転部材と対向する場合に較べて帯部材の偏倚を抑制することができる。
請求項１１に係る帯駆動装置によれば、除去部材が他の回転部材と対向する場合に較べて帯部材の偏倚を抑制することができる。
請求項１２に係る帯駆動装置によれば、除去部材が他の回転部材と対向する場合に較べて帯部材の偏倚を抑制することができる。
According to the belt drive device according to the first aspect, the transfer device according to the thirteenth aspect, and the image forming apparatus according to the fourteenth aspect, damage to the belt member due to the protruding body riding on the rotating member can be suppressed.
Further, according to the band driving device according to claim 1, the transfer device according to claim 13, and the image forming apparatus according to claim 14, the deviation of the band member is greater than when the removal member faces other rotating members. can be suppressed.
According to the band driving device according to the second aspect of the present invention, it is possible to suppress the projecting body from riding on the belt, compared to a case where the strength of contact is the same at the center portion and the end portion.
According to the band driving device according to the third aspect, it is possible to suppress the projecting body from riding on the belt, compared to a case where the center portion and the end portions have the same rigidity.
According to the band driving device according to the fourth aspect, it is possible to suppress the projecting body from riding on the belt, compared to a case where the hardness is the same in the center part and the end part.
According to the band driving device according to the fifth aspect, the friction with the band is smaller than that in the case where the contact portion is not subjected to the surface treatment.
According to the belt drive device according to the sixth aspect, it is possible to suppress the projecting body from riding on the belt, compared to a case where the distance between the center part and the end part is the same.
According to the band driving device according to the seventh aspect, it is possible to suppress the projecting body from riding on the belt, compared to a case where the thickness is the same in the center part and the end part.
According to the belt drive device according to the eighth aspect, it is possible to suppress the projecting body from riding on the belt, compared to a case where the boundary is located outside the first location.
According to the band driving device according to the ninth aspect, cleaning performance is excellent compared to a case where the boundary is located inside the second location.
According to the band driving device according to the tenth aspect, deviation of the band member can be suppressed compared to the case where the removal member faces another rotating member.
According to the band driving device according to the eleventh aspect, deviation of the band member can be suppressed compared to a case where the removal member faces another rotating member.
According to the band driving device according to the twelfth aspect, deviation of the band member can be suppressed compared to the case where the removal member faces another rotating member.

画像形成装置の第１実施形態を示す概略構成図である。1 is a schematic configuration diagram showing a first embodiment of an image forming apparatus. 二次転写器の構成を模式的に示す側面図である。FIG. 2 is a side view schematically showing the configuration of a secondary transfer device. 二次転写器の構成を模式的に示す上面図である。FIG. 3 is a top view schematically showing the configuration of a secondary transfer device. クリーニングブレード周辺の構造を模式的に示す図である。FIG. 3 is a diagram schematically showing the structure around the cleaning blade. 本発明の第２実施形態におけるクリーニングブレード周辺の構造を模式的に示す図である。FIG. 7 is a diagram schematically showing a structure around a cleaning blade in a second embodiment of the present invention. 央部と端部との境界位置を示す図である。It is a figure which shows the boundary position of a center part and an edge part. 本発明の第３実施形態におけるクリーニングブレード周辺の構造を模式的に示す図である。It is a figure which shows typically the structure around the cleaning blade in 3rd Embodiment of this invention. 本発明の第４実施形態におけるクリーニングブレード周辺の構造を模式的に示す図である。It is a figure which shows typically the structure around the cleaning blade in 4th Embodiment of this invention.

図１は、画像形成装置の第１実施形態を示す概略構成図である。 FIG. 1 is a schematic configuration diagram showing a first embodiment of an image forming apparatus.

図１に示す画像形成装置１はいわゆるタンデム方式のカラープリンタであり、この画像形成装置１では記録材として用紙Ｐが用いられる。なお、記録材としては、用紙Ｐ以外にプラスチック紙や封筒も採用され得るが、以下の説明では用紙Ｐを記録材の代表として用いて説明する。 An image forming apparatus 1 shown in FIG. 1 is a so-called tandem color printer, and a paper P is used as a recording material in this image forming apparatus 1. Note that, in addition to the paper P, plastic paper and envelopes may also be used as the recording material, but in the following explanation, the paper P will be used as a representative recording material.

画像形成装置１には、例えばＹ（イエロー）、Ｍ（マゼンタ）、Ｃ（シアン）、Ｋ（ブラック）の４色に対応した４つの画像エンジン１０Ｙ，１０Ｍ，１０Ｃ，１０Ｋが備えられている。また、本実施形態では、各画像エンジン１０Ｙ，……，１０Ｋは、いわゆる電子写真方式でトナー画像を形成する。各画像エンジン１０Ｙ，……，１０Ｋでは、帯電、露光、現像の各工程を順次に経ることで、各色のトナー画像が各感光体ドラム１１Ｙ，１１Ｍ，１１Ｃ，１１Ｋ上に形成される。 The image forming apparatus 1 includes four image engines 10Y, 10M, 10C, and 10K corresponding to four colors, for example, Y (yellow), M (magenta), C (cyan), and K (black). Further, in this embodiment, each image engine 10Y, . . . , 10K forms a toner image using a so-called electrophotographic method. In each image engine 10Y, . . . , 10K, a toner image of each color is formed on each photoreceptor drum 11Y, 11M, 11C, 11K by sequentially passing through each step of charging, exposure, and development.

本実施形態の画像形成装置１では間接転写方式が採用されていて、中間転写ベルト３０が備えられている。画像形成装置１には、二次転写器５０、定着装置６０、および用紙搬送部８０も備えられている。 The image forming apparatus 1 of this embodiment employs an indirect transfer method and includes an intermediate transfer belt 30. The image forming apparatus 1 also includes a secondary transfer device 50, a fixing device 60, and a paper transport section 80.

中間転写ベルト３０は、ベルト支持ロール３１～３５に架け渡された無端のベルトであり、画像形成部１０Ｙ，１０Ｍ，１０Ｃ，１０Ｋ、および二次転写器５０を経由して反時計回りに循環移動する。 The intermediate transfer belt 30 is an endless belt stretched over belt support rolls 31 to 35, and circulates counterclockwise via the image forming units 10Y, 10M, 10C, 10K, and the secondary transfer device 50. do.

各画像エンジン１０Ｙ，……，１０Ｋには、中間転写ベルト３０を間に挟んで各感光体ドラム１１Ｙ，……，１１Ｋに対向した各位置に一次転写ロール１５Ｙ，１５Ｍ，１５Ｃ，１５Ｋが配備されている。一次転写ロール１５Ｙ，……，１５Ｋは、電圧が印加されることで各感光体ドラム１１Ｙ，……，１１Ｋ上のトナー像を中間転写ベルト３０に静電吸引させる。各画像エンジン１０Ｙ，……，１０Ｋで形成された各色のトナー画像は、各一次転写ロール１５Ｙ，……，１５Ｋによって中間転写ベルト３０上に、順次に重ねて転写される。このような転写の結果として中間転写ベルト３０上にカラー画像が形成される。中間転写ベルト３０は、このカラー画像を保持して移動し、二次転写器５０へとカラー画像を搬送する。 In each image engine 10Y, . . . , 10K, primary transfer rolls 15Y, 15M, 15C, 15K are arranged at respective positions facing each photosensitive drum 11Y, . ing. The primary transfer rolls 15Y, . . . , 15K electrostatically attract the toner images on the photosensitive drums 11Y, . The toner images of each color formed by the image engines 10Y, . . . , 10K are sequentially transferred onto the intermediate transfer belt 30 by the primary transfer rolls 15Y, . As a result of such transfer, a color image is formed on the intermediate transfer belt 30. The intermediate transfer belt 30 moves while holding this color image, and conveys the color image to the secondary transfer device 50.

二次転写器５０は、ベルト支持ロール３１～３５の一つであるバックアップロール３４との間に中間転写ベルト３０を挟んで位置し、中間転写ベルト３０との間に用紙Ｐを挟んでカラー画像を転写する。 The secondary transfer device 50 is located with the intermediate transfer belt 30 sandwiched between it and a backup roll 34 which is one of the belt support rolls 31 to 35, and the color image is transferred by sandwiching the paper P between the secondary transfer device 50 and the intermediate transfer belt 30. transcribe.

用紙Ｐは、画像形成装置１の下部に設けられた用紙トレイＴに積み重なった状態で格納されている。用紙トレイＴ内の用紙Ｐは、用紙搬送部８０に備えられた繰り出しロール８１および捌きロール８２によって用紙トレイＴから１枚ずつ取り出され、搬送ロール８３によって搬送経路Ｒに沿って搬送される。用紙搬送部８０のレジロール８４は、中間転写ベルト３０によるカラー画像の搬送タイミングに合わせて用紙Ｐを二次転写器５０へと送り込む。 Paper sheets P are stored in a stacked state on a paper tray T provided at the bottom of the image forming apparatus 1 . The sheets P in the paper tray T are taken out one by one from the paper tray T by a feed roll 81 and a sorting roll 82 provided in the paper transport section 80, and are transported along the transport path R by a transport roll 83. The registration roll 84 of the paper conveyance section 80 feeds the paper P to the secondary transfer device 50 in synchronization with the timing at which the color image is conveyed by the intermediate transfer belt 30 .

二次転写器５０は、後で詳述するように、電圧が印加されることで中間転写ベルト３０上のカラー画像を用紙Ｐに転写させる。二次転写器５０は、本発明の帯駆動装置の第１実施形態であるとともに、本発明の転写装置の第１実施形態でもある。二次転写器５０によってカラー画像が転写された用紙Ｐは、二次転写器５０および用紙搬送部８０の搬送ロール８３によって定着装置６０へと搬送される。 The secondary transfer device 50 transfers the color image on the intermediate transfer belt 30 onto the paper P by applying a voltage, as will be described in detail later. The secondary transfer device 50 is the first embodiment of the belt drive device of the present invention, and is also the first embodiment of the transfer device of the present invention. The paper P onto which the color image has been transferred by the secondary transfer device 50 is transported to the fixing device 60 by the secondary transfer device 50 and the transport roll 83 of the paper transport section 80 .

画像形成部１０Ｙ，１０Ｍ，１０Ｃ，１０Ｋ、中間転写ベルト３０、および二次転写器５０を併せたものが、本発明にいう画像形成部の一例に相当する。また、二次転写器５０および用紙搬送部８０を併せたものが、本発明にいう搬送部の一例に相当する。 The combination of the image forming sections 10Y, 10M, 10C, and 10K, the intermediate transfer belt 30, and the secondary transfer device 50 corresponds to an example of the image forming section according to the present invention. Further, the combination of the secondary transfer device 50 and the paper conveyance section 80 corresponds to an example of the conveyance section according to the present invention.

定着装置６０は、用紙Ｐに対して加熱および加圧を行うことでカラー画像を用紙Ｐに定着させる。定着装置６０によってカラー画像が定着された用紙Ｐは、用紙搬送部８０が備える送出ロール８６によって画像形成装置１の外部へと送り出される。
以下、二次転写器５０について更に詳細に説明する。 The fixing device 60 fixes the color image onto the paper P by applying heat and pressure to the paper P. The paper P on which the color image has been fixed by the fixing device 60 is sent out to the outside of the image forming apparatus 1 by a delivery roll 86 included in the paper transport section 80 .
The secondary transfer device 50 will be explained in more detail below.

図２および図３は、二次転写器の構成を模式的に示す図である。図２には側面図、図３には上面図が示されている。また、図３では、説明の便宜上、二次転写器の内部が透視された状態で構成が示されている。 2 and 3 are diagrams schematically showing the configuration of the secondary transfer device. FIG. 2 shows a side view, and FIG. 3 shows a top view. Further, in FIG. 3, for convenience of explanation, the structure is shown in a state where the inside of the secondary transfer device is seen through.

二次転写器５０は、転写ロール５１と、剥離ロール５２と、それらのロールに架け回された無端状の転写ベルト５３を備えている。二次転写器５０は転写器支持フレーム５０１に各要素が組み込まれてユニット化されている。転写ロール５１および剥離ロール５２は回転軸５１１，５２１を有し、その回転軸５１１，５２１は転写器支持フレーム５０１によって回転可能に支持されている。転写ロール５１と剥離ロール５２が、本発明にいう複数の回転部材の一例に相当し、転写ベルト５３が、本発明にいう帯部材の一例に相当する。 The secondary transfer device 50 includes a transfer roll 51, a peeling roll 52, and an endless transfer belt 53 wrapped around these rolls. The secondary transfer device 50 is formed into a unit by incorporating each element into a transfer device support frame 501. The transfer roll 51 and the peeling roll 52 have rotating shafts 511 and 521, and the rotating shafts 511 and 521 are rotatably supported by the transfer device support frame 501. The transfer roll 51 and the peeling roll 52 correspond to an example of a plurality of rotating members according to the present invention, and the transfer belt 53 corresponds to an example of a band member according to the present invention.

転写ロール５１は、転写モータ５６によって駆動されて右回りに回転し、転写ベルト５３を駆動する。転写ベルト５３は、伸縮性の小さい樹脂ベルトであり、転写ロール５３による駆動力を受けて右回りに循環移動する。 The transfer roll 51 is driven by a transfer motor 56 and rotates clockwise to drive the transfer belt 53. The transfer belt 53 is a resin belt with low elasticity, and receives the driving force from the transfer roll 53 and circulates clockwise.

転写ロール５１は、転写ベルト５３の内側から転写ベルト５３を中間転写ベルト３０に押し当てている。互いに押し当てられた転写ベルト５３と中間転写ベルト３０との間に用紙Ｐが送られてくると、用紙Ｐは、転写ベルト５３および中間転写ベルト３０に挟まれて循環方向に搬送される。また、転写ロール５１は不図示の電源に接続されていて、その電源から転写バイアスが転写ロール５１に印加される。その転写バイアスの作用により、用紙Ｐが転写ベルト５３と中間転写ベルト３０との間を通過する間に、中間転写ベルト３０上のカラー画像が用紙Ｐ上に転写される。 The transfer roll 51 presses the transfer belt 53 against the intermediate transfer belt 30 from inside the transfer belt 53 . When the paper P is sent between the transfer belt 53 and the intermediate transfer belt 30 that are pressed against each other, the paper P is conveyed in the circulation direction while being sandwiched between the transfer belt 53 and the intermediate transfer belt 30. Further, the transfer roll 51 is connected to a power source (not shown), and a transfer bias is applied to the transfer roll 51 from the power source. Due to the action of the transfer bias, the color image on the intermediate transfer belt 30 is transferred onto the paper P while the paper P passes between the transfer belt 53 and the intermediate transfer belt 30.

剥離ロール５２は、転写ロール５１と比べ径の小さなロールであり、この剥離ロール５２で転写ベルト５３の走行方向を急激に曲げることで、その転写ベルト５３の上に載った状態にある用紙Ｐの先端を転写ベルト５３から剥離させる。本実施形態では、剥離ロール５２は転写ロール５１と比べ長さが短く、中間転写ベルト３０の移動に追従して回転する。 The peeling roll 52 is a roll with a smaller diameter than the transfer roll 51, and by sharply bending the running direction of the transfer belt 53 with this peeling roll 52, the paper P placed on the transfer belt 53 is removed. The leading end is peeled off from the transfer belt 53. In this embodiment, the peeling roll 52 is shorter in length than the transfer roll 51 and rotates following the movement of the intermediate transfer belt 30.

転写ベルト５３の縁には、転写ロール５１からの脱落を防ぐ樹脂製のリブ５３１が設けられている。リブ５３１は、転写ベルト５３の内周面から内側に向かって突き出しており、転写ベルト５３の縁に沿って転写ベルト５３の移動方向へと延びている。また、リブ５３１は、転写ロール５１および剥離ロール５２に対し、回転軸５１１，５２１の延びる方向に並んでいる。本実施形態では、転写ロール５１および剥離ロール５２を間に挟んだ両側にリブ５３１が設けられている。リブ５３１が、本発明にいう突出体の一例に相当する。 A rib 531 made of resin is provided on the edge of the transfer belt 53 to prevent it from falling off the transfer roll 51. The ribs 531 protrude inward from the inner circumferential surface of the transfer belt 53 and extend in the moving direction of the transfer belt 53 along the edge of the transfer belt 53. Furthermore, the ribs 531 are aligned with the transfer roll 51 and the peeling roll 52 in the direction in which the rotation shafts 511 and 521 extend. In this embodiment, ribs 531 are provided on both sides with the transfer roll 51 and peeling roll 52 interposed therebetween. The rib 531 corresponds to an example of a protrusion according to the present invention.

二次転写器５０は、クリーニングブレード５５を備え、クリーニングブレード５５は転写ベルト５３の外周面に縁が接触している。クリーニングブレード５５は転写器支持フレーム５０１に対して位置が固定されており、転写ベルト５３の移動に伴ってクリーニングブレード５５の縁が転写ベルト５３の外周面を擦る。転写ベルト５３に付着したトナーやその他の汚れは、クリーニングブレード５５に擦られて転写ベルト５３上から擦り落とされる。 The secondary transfer device 50 includes a cleaning blade 55 whose edge is in contact with the outer peripheral surface of the transfer belt 53. The position of the cleaning blade 55 is fixed with respect to the transfer device support frame 501, and the edge of the cleaning blade 55 rubs the outer peripheral surface of the transfer belt 53 as the transfer belt 53 moves. Toner and other stains adhering to the transfer belt 53 are rubbed by the cleaning blade 55 and rubbed off from the top of the transfer belt 53.

また、クリーニングブレード５５は、転写ベルト５３を挟んで転写ロール５１と対向する位置に設けられ、転写ベルト５３のリブ５３１が転写ロール５１に乗り上げることを抑制している。
図４は、クリーニングブレード周辺の構造を模式的に示す図である。
図４には、説明の便宜上、転写ロール５１および転写ベルト５３について断面が示されている。 Further, the cleaning blade 55 is provided at a position facing the transfer roll 51 with the transfer belt 53 in between, and prevents the rib 531 of the transfer belt 53 from riding on the transfer roll 51.
FIG. 4 is a diagram schematically showing the structure around the cleaning blade.
FIG. 4 shows cross sections of the transfer roll 51 and the transfer belt 53 for convenience of explanation.

クリーニングブレード５５は、板状の外形を有したゴム製の第１部分５５１と、第１部分５５１を保持した金属製の第２部分５５２とを備え、第１部分５５１の縁が転写ベルト５３の外周面に接触して不要物を除去する。転写ロール５１の延伸方向におけるクリーニングブレード５５の長さは転写ロール５１よりも長く、クリーニングブレード５５の端部は転写ロール５１の端部よりも更に外側まで達している。 The cleaning blade 55 includes a first part 551 made of rubber and having a plate-like outer shape, and a second part 552 made of metal that holds the first part 551. Removes unnecessary substances by contacting the outer peripheral surface. The length of the cleaning blade 55 in the extending direction of the transfer roll 51 is longer than the transfer roll 51, and the end of the cleaning blade 55 reaches further outside than the end of the transfer roll 51.

転写ベルト５３は、上述したように転写ロール５１によって駆動されて循環移動するが、ウォークと称される偏倚を生じる場合がある。ウォークによって転写ベルト５３は、循環移動の走行位置が、循環方向と交わる転写ロール５１の延伸方向へと偏っていく。図４には、図の左方へと転写ベルト５３が偏倚して、回転軸５１１を支持した転写器支持フレーム５０１の一方の壁側に転写ベルト５３が近づいた状態が示されている。 As described above, the transfer belt 53 is driven by the transfer roll 51 and moves in circulation, but it may cause a deviation called a walk. Due to the walk, the circulating position of the transfer belt 53 is biased toward the direction in which the transfer roll 51 extends, which intersects with the circulation direction. FIG. 4 shows a state in which the transfer belt 53 is biased to the left in the figure and approaches one wall side of the transfer device support frame 501 that supports the rotating shaft 511.

このように転写ベルト５３が偏倚すると、リブ５３１が転写ロール５１の端部と接触して偏倚を抑制する。ウォークによる転写ベルト５３の偏倚が強い場合には、リブ５３１が転写ロール５１の端部と接触したまま転写ロール５１の端部へと一部乗り上げる場合もある。このようにリブ５３１が転写ロール５１に乗り上げると、転写ベルト５３を押し戻す力が働いて転写ベルト５３の走行位置が転写ベルト５３の中心方向へと戻る。但し、リブ５３１が転写ロール５１に乗り上げた場合、転写ベルト５３には強い曲げ応力などが掛かるので、リブ５３１の乗り上げが繰り返されると転写ベルト５３が損傷する虞がある。
また、リブ５３１の乗り上げが頻回に生じるとクリーニングブレード５５の縁が押し上げられて、クリーニング不良の原因となる虞もある。 When the transfer belt 53 is deflected in this manner, the ribs 531 come into contact with the ends of the transfer roll 51 to suppress the deflection. If the deviation of the transfer belt 53 due to the walk is strong, the ribs 531 may partially ride onto the end of the transfer roll 51 while remaining in contact with the end of the transfer roll 51 . When the rib 531 rides on the transfer roll 51 in this way, a force pushing back the transfer belt 53 acts, and the running position of the transfer belt 53 returns to the center of the transfer belt 53. However, if the rib 531 rides on the transfer roll 51, strong bending stress or the like is applied to the transfer belt 53, so if the rib 531 rides on the transfer roll 51 repeatedly, the transfer belt 53 may be damaged.
Further, if the rib 531 rides on the surface frequently, the edge of the cleaning blade 55 may be pushed up, which may cause cleaning failure.

本実施形態では、上述したようにクリーニングブレード５５が長いため、クリーニングブレード５５の縁が転写ベルト５３の外周面に接触した力によって転写ベルト５３の縁部が押さえられてリブ５３１の転写ロール５１への乗り上げが抑制される。クリーニングブレード５５が転写ベルト５３を押さえている箇所は転写ベルト５３の全周のうちの一部である。しかしながら、リブ５３１が転写ロール５１の端部に接触するまで転写ベルト５３が偏倚した場合には、転写ベルト５３を押し戻す力がこの箇所で強く働き、転写ベルト５３の走行位置が転写ベルト５３の中心方向へと戻る。従って、リブ５３１が転写ロール５１の端部に乗り上げる頻度が下がり、その結果、転写ベルト５３の損傷が抑制され、クリーニング不良も抑制される。 In this embodiment, as described above, since the cleaning blade 55 is long, the edge of the transfer belt 53 is pressed by the force of the edge of the cleaning blade 55 contacting the outer peripheral surface of the transfer belt 53, and the edge of the transfer belt 53 is pressed against the transfer roll 51 of the rib 531. This will prevent the vehicle from running over the ground. The area where the cleaning blade 55 presses the transfer belt 53 is a part of the entire circumference of the transfer belt 53. However, if the transfer belt 53 is deflected until the rib 531 comes into contact with the end of the transfer roll 51, a force pushing back the transfer belt 53 acts strongly at this point, and the running position of the transfer belt 53 shifts to the center of the transfer belt 53. Return to direction. Therefore, the frequency with which the ribs 531 ride on the ends of the transfer roll 51 is reduced, and as a result, damage to the transfer belt 53 is suppressed and poor cleaning is also suppressed.

転写ロール５１は、転写モータ５６によって駆動される駆動ロールであるため、転写ベルト５３の走行位置を転写ロール５１の延伸方向へと変化させる力が、転写ベルト５３に追従して回転する剥離ロール５２よりも強い。そのような駆動ロールと対向する位置にクリーニングブレード５５が設けられていることで、リブ５３１が転写ロール５１の端部に接触したときに転写ベルト５３を押し戻す力が強く働き、リブ５３１の乗り上げが強く抑制される。 Since the transfer roll 51 is a drive roll driven by the transfer motor 56, the force that changes the running position of the transfer belt 53 in the stretching direction of the transfer roll 51 is applied to the peeling roll 52 that rotates following the transfer belt 53. stronger than By providing the cleaning blade 55 at a position facing the drive roll, a strong force is exerted to push back the transfer belt 53 when the rib 531 contacts the end of the transfer roll 51, thereby preventing the rib 531 from riding on the transfer belt 53. strongly suppressed.

また、転写ロール５１は剥離ロール５２よりも径の大きなロールであるため、転写ベルト５３の走行位置を転写ロール５１の延伸方向へと変化させる力が剥離ロール５２より強い。そのような大きな径のロールと対向する位置にクリーニングブレード５５が設けられていることでも、リブ５３１が転写ロール５１の端部に接触したときに転写ベルト５３を押し戻す力が強く働き、リブ５３１の乗り上げが強く抑制される。 Further, since the transfer roll 51 is a roll having a larger diameter than the peeling roll 52, the force for changing the running position of the transfer belt 53 in the stretching direction of the transfer roll 51 is stronger than that of the peeling roll 52. Since the cleaning blade 55 is provided at a position facing such a large diameter roll, a strong force is exerted to push back the transfer belt 53 when the rib 531 comes into contact with the end of the transfer roll 51, and the rib 531 is Riding is strongly suppressed.

更に、転写ロール５１は剥離ロール５２よりも長いロールであるため、転写ベルト５３の走行位置を転写ロール５１の延伸方向へと変化させる力が剥離ロール５２より強い。そのような長いロールと対向する位置にクリーニングブレード５５が設けられていることでも、リブ５３１が転写ロール５１の端部に接触したときに転写ベルト５３を押し戻す力が強く働き、リブ５３１の乗り上げが強く抑制される。 Further, since the transfer roll 51 is a longer roll than the peeling roll 52, the force for changing the running position of the transfer belt 53 in the stretching direction of the transfer roll 51 is stronger than that of the peeling roll 52. The fact that the cleaning blade 55 is provided at a position facing such a long roll also causes a strong force to push back the transfer belt 53 when the rib 531 comes into contact with the end of the transfer roll 51, thereby preventing the rib 531 from running over. strongly suppressed.

次に、本発明の第２実施形態について説明する。この第２実施形態は、クリーニングブレード５５の構成が異なっている点を除いて第１実施形態と同様の実施形態であるので、以下では第１実施形態との相違点に着目して説明を行い、重複説明は省略する。
図５は、本発明の第２実施形態におけるクリーニングブレード周辺の構造を模式的に示す図である。 Next, a second embodiment of the present invention will be described. The second embodiment is similar to the first embodiment except for the difference in the configuration of the cleaning blade 55, so the following description will focus on the differences from the first embodiment. , redundant explanation will be omitted.
FIG. 5 is a diagram schematically showing the structure around the cleaning blade in the second embodiment of the present invention.

第２実施形態では、クリーニングブレード５５の第２部分５５２の形状が第１実施形態とは異なっている。即ち、転写ロール５１の延伸方向における端部５５３で第２部分５５２が転写ベルト５３の方へ突き出していて、央部５５４に較べて端部５５３の方が第２部分５５２と転写ベルト５３との距離が近い。つまり、央部５５４に較べて端部５５３の方が、第１部分５５１における転写ベルト５３側への突き出しが小さい。 In the second embodiment, the shape of the second portion 552 of the cleaning blade 55 is different from that in the first embodiment. That is, the second portion 552 protrudes toward the transfer belt 53 at the end portion 553 in the stretching direction of the transfer roll 51, and the distance between the second portion 552 and the transfer belt 53 is greater at the end portion 553 than at the center portion 554. the distance is close. In other words, the protrusion of the first portion 551 toward the transfer belt 53 is smaller at the end portion 553 than at the center portion 554 .

その結果、第１部分５５１と第２部分５５２とを併せたクリーニングブレード５５の剛性は、央部５５４に較べて端部５５３の方が高い。また、クリーニングブレード５５が転写ベルト５３の外周面に接触する強さも、央部５５４に較べて端部５５３の方が強い。従って、端部５５３ではリブ５３１の乗り上げが強く抑制されるとともに、央部５５４では転写ベルト５３のクリーニングに適した接触圧により高いクリーニング性が得られる。
ここで、央部５５４と端部５５３との境界位置について検討する。
図６は、央部と端部との境界位置を示す図である。 As a result, the rigidity of the cleaning blade 55 including the first portion 551 and the second portion 552 is higher at the end portion 553 than at the center portion 554. Further, the strength with which the cleaning blade 55 contacts the outer peripheral surface of the transfer belt 53 is stronger at the end portion 553 than at the center portion 554. Therefore, riding on the rib 531 is strongly suppressed at the end portion 553, and high cleaning performance is obtained at the center portion 554 due to the contact pressure suitable for cleaning the transfer belt 53.
Here, the boundary position between the center portion 554 and the end portions 553 will be considered.
FIG. 6 is a diagram showing the boundary position between the center part and the end part.

央部５５４と端部５５３との境界Ｂは、転写ロール５１の延伸方向における位置が転写ロール５１の端部付近となっている。より具体的には、転写ロール５１の端部の位置Ｐ０を基準として、リブ５３１の幅ｄだけ端部の位置Ｐ０から外側に在る第１箇所Ｐ１よりも内側に境界Ｂが位置する。これにより、クリーニングブレード５５は、リブ５３１が転写ロール５１に乗り上げる箇所で転写ベルト５３の外周面と強く接触することになり、リブ５３１の乗り上げが強く抑制される。 The boundary B between the center portion 554 and the end portions 553 is located near the end of the transfer roll 51 in the stretching direction of the transfer roll 51 . More specifically, with reference to the end position P0 of the transfer roll 51, the boundary B is located inside the first location P1, which is located outside the end position P0 by the width d of the rib 531. As a result, the cleaning blade 55 comes into strong contact with the outer circumferential surface of the transfer belt 53 at the portion where the rib 531 rides on the transfer roll 51, and the riding of the rib 531 is strongly suppressed.

また、転写ロール５１の端部の位置Ｐ０を基準として、リブ５３１の幅ｄだけ端部の位置Ｐ０から内側に在る第２箇所Ｐ２よりも外側に境界Ｂが位置する。これにより、クリーニングブレード５５は、リブ５３１の乗り上げ抑制に対する寄与が低い箇所ではクリーニングに適した強さで転写ベルト５３の外周面と接触し、高いクリーニング性が得られる。 Further, with reference to the end position P0 of the transfer roll 51, the boundary B is located outside the second location P2, which is located inside from the end position P0 by the width d of the rib 531. As a result, the cleaning blade 55 comes into contact with the outer circumferential surface of the transfer belt 53 with a strength suitable for cleaning at locations where the rib 531 has a low contribution to preventing riding, and high cleaning performance is obtained.

次に、本発明の第３実施形態について説明する。この第３実施形態も、クリーニングブレード５５の構成が異なっている点を除いて第１実施形態と同様の実施形態であるので、以下では第１実施形態との相違点に着目して説明を行い、重複説明は省略する。
図７は、本発明の第３実施形態におけるクリーニングブレード周辺の構造を模式的に示す図である。 Next, a third embodiment of the present invention will be described. This third embodiment is also similar to the first embodiment except for the difference in the configuration of the cleaning blade 55, so the following description will focus on the differences from the first embodiment. , redundant explanation will be omitted.
FIG. 7 is a diagram schematically showing the structure around the cleaning blade in the third embodiment of the present invention.

第３実施形態では、クリーニングブレード５５の第１部分５５１の形状が第１実施形態とは異なっている。即ち、第１部分５５１は端部５５５の厚さが他の箇所（即ち央部）よりも厚い。この結果、第１部分５５１は端部５５５で央部よりも剛性が高く、第１部分５５１と第２部分５５２とを併せたクリーニングブレード５５として見ても央部よりも端部で剛性が高い。また、クリーニングブレード５５が転写ベルト５３の外周面に接触する強さも、央部に較べて端部の方が強い。 In the third embodiment, the shape of the first portion 551 of the cleaning blade 55 is different from that in the first embodiment. That is, the end portion 555 of the first portion 551 is thicker than other portions (ie, the center portion). As a result, the first portion 551 has higher rigidity at the end portion 555 than the center portion, and even when viewed as the cleaning blade 55 including the first portion 551 and the second portion 552, the rigidity is higher at the end portion than the center portion. . Further, the strength with which the cleaning blade 55 contacts the outer circumferential surface of the transfer belt 53 is stronger at the ends than at the center.

従って、第３実施形態でも第２実施形態と同様に、クリーニングブレード５５の端部ではリブ５３１の乗り上げが強く抑制されるとともに、クリーニングブレード５５の央部では転写ベルト５３のクリーニングに適した接触圧により高いクリーニング性が得られる。 Therefore, in the third embodiment, as in the second embodiment, riding on the rib 531 at the end of the cleaning blade 55 is strongly suppressed, and at the center of the cleaning blade 55, a contact pressure suitable for cleaning the transfer belt 53 is applied. This results in higher cleaning performance.

次に、本発明の第４実施形態について説明する。この第４実施形態も、クリーニングブレード５５の構成が異なっている点を除いて第１実施形態と同様の実施形態であるので、以下では第１実施形態との相違点に着目して説明を行い、重複説明は省略する。
図８は、本発明の第４実施形態におけるクリーニングブレード周辺の構造を模式的に示す図である。 Next, a fourth embodiment of the present invention will be described. This fourth embodiment is also similar to the first embodiment except that the configuration of the cleaning blade 55 is different, so the following explanation will focus on the differences from the first embodiment. , redundant explanation will be omitted.
FIG. 8 is a diagram schematically showing the structure around the cleaning blade in the fourth embodiment of the present invention.

第４実施形態では、クリーニングブレード５５の第１部分５５１に、例えばダイヤモンド・ライク・カーボンによる表面処理が施される。この表面処理によって第１部分５５１の表面が硬化して転写ベルト５３との摩擦が低下するのでクリーニングブレード５５が長寿命化する。また、第１部分５５１の端部５５６では央部５５７よりも幅広い領域に表面処理が施されている。このため、第１部分５５１の端部５５６では央部５５７よりも剛性が高く、転写ベルト５３の外周面との接触圧も高い。 In the fourth embodiment, the first portion 551 of the cleaning blade 55 is subjected to surface treatment using, for example, diamond-like carbon. This surface treatment hardens the surface of the first portion 551 and reduces friction with the transfer belt 53, thereby extending the life of the cleaning blade 55. Further, a wider area of the end portion 556 of the first portion 551 than the center portion 557 is subjected to surface treatment. Therefore, the end portion 556 of the first portion 551 has higher rigidity than the center portion 557, and the contact pressure with the outer peripheral surface of the transfer belt 53 is also higher.

従って、第４実施形態でも第２実施形態と同様に、クリーニングブレード５５の端部ではリブ５３１の乗り上げが強く抑制されるとともに、クリーニングブレード５５の央部では転写ベルト５３のクリーニングに適した接触圧により高いクリーニング性が得られる。 Therefore, in the fourth embodiment, as in the second embodiment, riding on the rib 531 is strongly suppressed at the end of the cleaning blade 55, and at the center of the cleaning blade 55, a contact pressure suitable for cleaning the transfer belt 53 is applied. This results in higher cleaning performance.

なお、上記説明では、本発明にいう除去部材が本発明にいう帯部材の両縁で本発明にいう回転部材の端部よりも外側に延びた例が示されているが、本発明にいう除去部材は、例えばウォークで突出体が乗り上げる傾向の強い片側のみで回転部材の端部よりも外側に延びていてもよい。 In addition, in the above description, an example is shown in which the removal member referred to in the present invention extends outward from the end of the rotating member referred to in the present invention at both edges of the band member referred to in the present invention. The removal member may extend outward from the end of the rotary member only on one side where the protrusion has a strong tendency to run over during walking, for example.

また、上記説明では、本発明の帯駆動装置が転写装置に適用された例が示されているが、本発明の帯駆動装置は、中間転写ベルトを駆動するユニットや用紙搬送ベルトを駆動する装置などに適用されても良い。 Further, in the above description, an example is shown in which the belt drive device of the present invention is applied to a transfer device, but the belt drive device of the present invention is a unit that drives an intermediate transfer belt or a device that drives a paper conveyance belt. It may also be applied to

また、上記説明では、本発明の画像形成装置の実施形態としてカラープリンタが例示されているが、本発明の画像形成装置は、モノクロ専用のプリンタであってもよいし、コピー機やファクシミリや複合機であってもよい。 Further, in the above description, a color printer is exemplified as an embodiment of the image forming apparatus of the present invention, but the image forming apparatus of the present invention may also be a monochrome-only printer, a copy machine, a facsimile machine, a multifunction printer, etc. It may be a machine.

また、本発明は、「発明が解決しようとする課題」欄に記載された課題を解決する目的で発明されたものであるが、本発明の構成は、この課題を解決しない形での他の目的への転用が妨げられるものではなく、そのように本発明の構成が転用された形態も本発明の一実施形態である。 In addition, although the present invention was invented for the purpose of solving the problem described in the "Problem to be Solved by the Invention" column, the structure of the present invention does not solve the problem in other ways that do not solve the problem. This does not preclude diversion to other purposes, and such diversions of the configuration of the present invention are also an embodiment of the present invention.

１……画像形成装置、 １０Ｙ，１０Ｍ，１０Ｃ，１０Ｋ……画像エンジン、
３０……中間転写ベルト、 ５０……二次転写器、 ５０１……転写器支持フレーム、
５１……転写ロール、 ５２……剥離ロール、 ５３……転写ベルト、 ５３……リブ、
５６……転写モータ、 ５５……クリーニングブレード、 ５５１……第１部分、
５５２……第２部分、 ６０……定着装置、 ８０……用紙搬送部 1... Image forming device, 10Y, 10M, 10C, 10K... Image engine,
30... Intermediate transfer belt, 50... Secondary transfer device, 501... Transfer device support frame,
51... Transfer roll, 52... Peeling roll, 53... Transfer belt, 53... Rib,
56...Transfer motor, 55...Cleaning blade, 551...First part,
552...Second part, 60...Fixing device, 80...Paper transport section

Claims (14)

環状に繋がった帯部材と、
互いに並んで延びて各々が回転し、前記帯部材が掛け回されて循環移動する複数の回転部材と、
前記帯部材の内周面から突出し、当該帯部材の縁に沿って延び、前記回転部材の延伸方向で当該回転部材に並んだ突出体と、
板状の部分を有し、前記帯部材を挟んで前記回転部材と対向した箇所で当該帯部材の外周面に当該板状の部分が接触して当該外周面から不要物を除去する、前記延伸方向に前記回転部材の端部よりも外側まで延びた除去部材とを備え、
前記除去部材は、前記複数の回転部材のうち、駆動力を受けて回転することで当該除去部材を駆動する回転部材と、前記帯部材を挟んで対向することを特徴とする帯駆動装置。 A belt member connected in a ring,
a plurality of rotating members extending side by side with each other, each of which rotates, and around which the band member is wrapped around and moves in circulation;
a protrusion that protrudes from the inner circumferential surface of the band member, extends along the edge of the band member, and is lined up with the rotating member in the extending direction of the rotating member;
The stretching step has a plate-shaped portion, and the plate-shaped portion contacts the outer circumferential surface of the band member at a location facing the rotating member across the band member to remove unnecessary materials from the outer circumferential surface. a removal member extending outward from the end of the rotating member in the direction ;
The band driving device is characterized in that the removing member is opposed to a rotating member of the plurality of rotating members that drives the removing member by rotating in response to a driving force, with the band member interposed therebetween. 前記除去部材は、前記延伸方向における央部よりも端部の方が前記外周面に強く接触することを特徴とする請求項１に記載の帯駆動装置。 The band driving device according to claim 1, wherein the removing member contacts the outer circumferential surface more strongly at an end portion than at a central portion in the stretching direction. 前記除去部材は、前記延伸方向における央部よりも端部の方が高い剛性を有することを特徴とする請求項１または２に記載の帯駆動装置。 The band driving device according to claim 1 or 2, wherein the removing member has higher rigidity at an end portion than at a center portion in the stretching direction. 前記除去部材は、部分的な表面処理によって前記央部よりも前記端部の方が硬いことを特徴とする請求項２または３に記載の帯駆動装置。 4. The band driving device according to claim 2, wherein the removing member is harder at the end portion than at the center portion due to partial surface treatment. 前記除去部材は、前記帯部材との接触部分にも前記表面処理が施されていることを特徴とする請求項４に記載の帯駆動装置。 5. The band driving device according to claim 4, wherein the removing member is also subjected to the surface treatment on a contact portion with the band member. 前記除去部材は、前記帯部材の外周面と接触する第１部分と、前記第１部分を保持し当該第１部分よりも高い剛性を有する第２部分とを有し、
前記第２部分は、前記央部よりも前記端部の方が前記外周面との距離が短いことを特徴とする請求項２または３に記載の帯駆動装置。 The removal member has a first portion that contacts the outer circumferential surface of the band member, and a second portion that holds the first portion and has higher rigidity than the first portion,
4. The band driving device according to claim 2, wherein the end portion of the second portion is shorter in distance from the outer circumferential surface than the center portion. 前記除去部材は、前記央部よりも前記端部の方が厚いことを特徴とする請求項２または３に記載の帯駆動装置。 The band driving device according to claim 2 or 3, wherein the removing member is thicker at the end portion than at the center portion. 前記除去部材は、前記回転部材の端面位置から前記延伸方向に前記突出体の幅分だけ外側の第１箇所よりも内側に、前記央部と前記端部との境界が位置することを特徴とする請求項２または３に記載の帯駆動装置。 The removal member is characterized in that a boundary between the center portion and the end portion is located inside a first location that is outside a first location by a width of the protrusion in the stretching direction from an end surface position of the rotating member. The band driving device according to claim 2 or 3. 前記除去部材は、前記回転部材の端面位置から前記延伸方向に前記突出体の幅分だけ内側の第２箇所よりも外側に、前記央部と前記端部との境界が位置することを特徴とする請求項２または３に記載の帯駆動装置。 The removal member is characterized in that a boundary between the center portion and the end portion is located outside a second location that is located inside by the width of the protrusion in the stretching direction from the end face position of the rotating member. The band driving device according to claim 2 or 3. 前記除去部材は、前記複数の回転部材のうち、前記帯部材の位置を前記延伸方向に変更する力が最も強い回転部材と、前記帯部材を挟んで対向することを特徴とする請求項１から９のいずれか１項に記載の帯駆動装置。 From claim 1, wherein the removing member faces a rotating member having the strongest force for changing the position of the band member in the stretching direction, with the band member interposed therebetween, among the plurality of rotating members. 9. The band drive device according to any one of 9. 前記除去部材は、前記複数の回転部材のうち、前記延伸方向の長さが最も長い回転部材と、前記帯部材を挟んで対向することを特徴とする請求項１０に記載の帯駆動装置。 The band driving device according to claim 10, wherein the removing member faces a rotating member having the longest length in the stretching direction among the plurality of rotating members, with the band member interposed therebetween. 前記除去部材は、前記複数の回転部材のうち最も太い回転部材と、前記帯部材を挟んで対向することを特徴とする請求項１０または１１に記載の帯駆動装置。 The band driving device according to claim 10 or 11, wherein the removing member faces the thickest rotating member among the plurality of rotating members with the band member interposed therebetween. 環状に繋がり、外周面が記録材に接触し、電圧の印加を受けることで当該記録材上に画像を転写する帯部材と、
互いに並んで延びて各々が回転し、前記帯部材が掛け回されて循環移動する複数の回転部材と、
前記帯部材の内周面から突出し、当該帯部材の縁に沿って延び、前記回転部材の延伸方向で当該回転部材に並んだ突出体と、
板状の外形を有し、前記帯部材を挟んで前記回転部材と対向した箇所で当該帯部材の外周面に接触して当該外周面から不要物を除去する、前記延伸方向に前記回転部材の端部よりも外側まで延びた除去部材とを備え、
前記除去部材は、前記複数の回転部材のうち、駆動力を受けて回転することで当該除去部材を駆動する回転部材と、前記帯部材を挟んで対向することを特徴とする転写装置。 a belt member connected in a ring shape, whose outer peripheral surface contacts a recording material, and transfers an image onto the recording material by receiving a voltage;
a plurality of rotating members extending side by side with each other, each of which rotates, and around which the band member is wrapped around and moves in circulation;
a protrusion that protrudes from the inner circumferential surface of the band member, extends along the edge of the band member, and is lined up with the rotating member in the extending direction of the rotating member;
The rotary member has a plate-like outer shape and contacts the outer circumferential surface of the band member at a location facing the rotating member across the band member to remove unnecessary materials from the outer circumferential surface of the rotating member in the stretching direction. and a removal member extending outward from the end ,
The transfer device is characterized in that the removing member is opposed to a rotating member of the plurality of rotating members that drives the removing member by rotating in response to a driving force, with the band member interposed therebetween. 記録材を搬送する搬送部と、
前記搬送部によって搬送される記録材に画像を形成する画像形成部と、
前記搬送部および前記画像形成部の少なくとも一方に組み込まれた帯駆動装置と、を備え、
前記帯駆動装置が、
環状に繋がった帯部材と、
互いに並んで延びて各々が回転し、前記帯部材が掛け回されて循環移動する複数の回転部材と、
前記帯部材の内周面から突出し、当該帯部材の縁に沿って延び、前記回転部材の延伸方向で当該回転部材に並んだ突出体と、
板状の外形を有し、前記帯部材を挟んで前記回転部材と対向した箇所で当該帯部材の外周面に接触して当該外周面から不要物を除去する、前記延伸方向に前記回転部材の端部よりも外側まで延びた除去部材とを備え、
前記除去部材は、前記複数の回転部材のうち、駆動力を受けて回転することで当該除去部材を駆動する回転部材と、前記帯部材を挟んで対向することを特徴とする画像形成装置。 a conveyance unit that conveys the recording material;
an image forming unit that forms an image on a recording material transported by the transport unit;
a band driving device incorporated in at least one of the conveying section and the image forming section,
The band driving device
A belt member connected in a ring,
a plurality of rotating members extending side by side with each other, each of which rotates, and around which the band member is wrapped around and moves in circulation;
a protrusion that protrudes from the inner circumferential surface of the band member, extends along the edge of the band member, and is lined up with the rotating member in the extending direction of the rotating member;
The rotary member has a plate-like outer shape and contacts the outer circumferential surface of the band member at a location facing the rotating member across the band member to remove unnecessary materials from the outer circumferential surface of the rotating member in the stretching direction. and a removal member extending outward from the end ,
The image forming apparatus is characterized in that the removing member is opposed to a rotating member of the plurality of rotating members that drives the removing member by rotating in response to a driving force, with the band member interposed therebetween.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009258483A (en) 2008-04-18 2009-11-05 Sharp Corp Cleaning device and image forming apparatus using the same
JP2018049088A (en) 2016-09-20 2018-03-29 株式会社リコー Cleaning blade, cleaning device, image forming apparatus, and method for manufacturing cleaning blade

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Publication number Priority date Publication date Assignee Title
JPH05333753A (en) * 1992-05-28 1993-12-17 Yokohama Rubber Co Ltd:The Cleaning blade

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009258483A (en) 2008-04-18 2009-11-05 Sharp Corp Cleaning device and image forming apparatus using the same
JP2018049088A (en) 2016-09-20 2018-03-29 株式会社リコー Cleaning blade, cleaning device, image forming apparatus, and method for manufacturing cleaning blade

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