WO2020196732A1 - Development method and image forming apparatus - Google Patents

Development method and image forming apparatus Download PDF

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Publication number
WO2020196732A1
WO2020196732A1 PCT/JP2020/013609 JP2020013609W WO2020196732A1 WO 2020196732 A1 WO2020196732 A1 WO 2020196732A1 JP 2020013609 W JP2020013609 W JP 2020013609W WO 2020196732 A1 WO2020196732 A1 WO 2020196732A1
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WO
WIPO (PCT)
Prior art keywords
roller
photosensitive drum
bias
charging
toner
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PCT/JP2020/013609
Other languages
French (fr)
Japanese (ja)
Inventor
慎太郎 鈴木
和馬 樋上
茉莉花 尾崎
草太 河村
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ブラザー工業株式会社
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Publication of WO2020196732A1 publication Critical patent/WO2020196732A1/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
    • G03G21/18—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements using a processing cartridge, whereby the process cartridge comprises at least two image processing means in a single unit

Definitions

  • the present disclosure relates to a developing method and an image forming apparatus.
  • the cleanerless development method includes a step of supplying toner from the housing to the photosensitive drum by the developing roller, a step of transferring the toner on the surface of the photosensitive drum to the sheet by the transfer roller, and a residual toner by the charging roller. It includes a step of charging the surface of the photosensitive drum and a step of collecting the residual toner to the housing by a developing roller (see Patent Document 1 below).
  • filming may occur on the surface of the photosensitive drum as the number of printed sheets increases. If filming occurs on the surface of the photosensitive drum, the image quality may deteriorate.
  • an object of the present disclosure is to provide a developing method and an image forming apparatus capable of recovering residual toner by using a developing roller while suppressing filming on the surface of the photosensitive drum.
  • the developing method of the present disclosure includes a step of supplying toner to a photosensitive drum from a housing capable of accommodating a non-magnetic one-component negatively charged toner by a developing roller to which a negative development bias is applied.
  • the process of transferring the toner on the surface of the photosensitive drum to the sheet by the transfer roller to which a positive transfer bias is applied and the residual toner on the surface of the photosensitive drum are removed by the difference in peripheral speed between the roller and the photosensitive drum.
  • It is a negative peeling roller bias that is peeled off from the surface of the photosensitive drum and has a larger absolute value than the development bias.
  • the peeling roller bias applied to the peeling roller negatively charges the peeled residual toner, and the charged residual toner is charged.
  • the process of applying the toner to the surface of the photosensitive drum includes a step of collecting the residual toner to the housing by the developing roller to which is applied.
  • the residual toner adhering to the surface of the photosensitive drum is peeled off from the surface of the photosensitive drum by a peeling roller.
  • the residual toner peeled off from the surface of the photosensitive drum is charged by the peeling roller, attached to the surface of the photosensitive drum, and collected in the housing by the developing roller.
  • the residual toner can be recovered using a developing roller while suppressing the filming of the surface of the photosensitive drum.
  • the development method is a step of applying a development bias to the development roller and then applying a positive transfer bias to the transfer roller and applying the peeling roller bias to the peeling roller after a predetermined first time has elapsed.
  • a step of applying the development bias to the development roller after a predetermined second time has elapsed after applying the charge bias to the charge roller may be further included.
  • the developing method is a step of forming an electrostatic latent image on the surface of the photosensitive drum by exposing the surface of the photosensitive drum charged by the charging roller before the toner is supplied to the photosensitive drum by the developing roller. May be further included.
  • the image forming apparatus of the present disclosure includes a housing, a photosensitive drum, a developing roller, a transfer roller, a peeling roller, and a charging roller.
  • the housing can accommodate a non-magnetic one-component negatively charged toner.
  • a toner image made of toner is formed on the surface of the photosensitive drum.
  • a negative development bias is applied to the developing roller.
  • the developing roller can supply the toner in the housing to the surface of the photosensitive drum.
  • a positive transfer bias is applied to the transfer roller.
  • the transfer roller can transfer the toner image from the surface of the photosensitive drum to the sheet.
  • a negative peeling roller bias having an absolute value larger than the development bias is applied to the peeling roller.
  • the peeling roller can peel off the residual toner remaining on the surface of the photosensitive drum without being transferred to the sheet from the surface of the photosensitive drum due to the difference in peripheral speed between the peeling roller and the photosensitive drum.
  • the peeling roller removes the peeled residual toner and negatively charges it by the roller bias, and attaches the charged residual toner to the surface of the photosensitive drum.
  • a negative charging bias having a larger absolute value than the peeling roller bias is applied to the charging roller.
  • the charging roller negatively charges the surface of the photosensitive drum with the residual toner.
  • the image forming apparatus collects the residual toner in the housing by the developing roller to which the developing bias is applied.
  • the image forming apparatus may further include a control unit. After applying the development bias to the developing roller, the control unit applies a positive transfer bias to the transfer roller and applies the peeling roller bias to the peeling roller after a predetermined first time has elapsed. The control unit applies the development bias to the developing roller after a predetermined second time has elapsed after applying the charging bias to the charging roller.
  • the image forming apparatus may further include an exposure apparatus.
  • the exposure apparatus forms an electrostatic latent image on the surface of the photosensitive drum by exposing the surface of the photosensitive drum charged by the charging roller before the toner is supplied to the photosensitive drum by the developing roller.
  • the image forming apparatus may further include a charged cleaning roller.
  • the charged cleaning roller cleans the charged roller.
  • the charged cleaning roller may be driven by the charged roller.
  • a negative cleaning bias having an absolute value equal to or less than the charging bias may be applied to the charging cleaning roller.
  • the image forming apparatus may further include a cleaner member.
  • the cleaner member comes into contact with the charged cleaning roller and collects the paper dust attached to the charged cleaning roller.
  • the peripheral speed of the charged cleaning roller and the peripheral speed of the charged roller may be different.
  • a negative first cleaning bias having an absolute value smaller than the charging bias may be applied to the charging cleaning roller.
  • a negative second cleaning bias having an absolute value smaller than that of the first cleaning bias may be applied to the cleaner member.
  • the image forming apparatus may include a drum cartridge and a developing cartridge.
  • the drum cartridge includes a photosensitive drum, a charging roller, and a peeling roller.
  • the developing cartridge can be attached to the drum cartridge.
  • the developing cartridge includes a housing and a developing roller.
  • the drum cartridge may further include a transfer roller.
  • the residual toner can be recovered by using the developing roller while suppressing the filming of the surface of the photosensitive drum.
  • FIG. 1 is a schematic configuration diagram of an image forming apparatus.
  • FIG. 2 is an explanatory diagram illustrating an electrical connection between each of the charging roller, the developing roller, the transfer roller, and the peeling roller and the control unit.
  • FIG. 3 is a flowchart for explaining a developing method.
  • FIG. 4A is an explanatory diagram for explaining the developing process of FIG.
  • FIG. 4B is an explanatory diagram for explaining the transfer process of FIG.
  • FIG. 5A is an explanatory diagram for explaining the peeling process of FIG.
  • FIG. 5B is an explanatory diagram for explaining the charging process of FIG.
  • FIG. 6A is an explanatory diagram for explaining the exposure process of FIG.
  • FIG. 6B is an explanatory diagram for explaining the recovery process of FIG.
  • FIG. 4A is an explanatory diagram for explaining the developing process of FIG.
  • FIG. 4B is an explanatory diagram for explaining the transfer process of FIG.
  • FIG. 5A is an explanatory diagram for explaining the peeling process
  • FIG. 7 shows the timing for applying the charging bias to the charging roller, the timing for applying the development bias to the developing roller, the timing for applying the transfer bias to the transfer roller, and the timing for applying the peeling roller bias to the peeling roller. It is a chart.
  • FIG. 8 is an explanatory diagram for explaining a modified example.
  • the image forming apparatus 1 includes a main body housing 2, a sheet supply unit 3, a photosensitive drum 4, a charging roller 5, an exposure device 6, a housing 7, a developing roller 8, a transfer roller 9, and a fixing device. It is provided with 10.
  • the image forming apparatus 1 includes a drum cartridge 11A and a developing cartridge 11B.
  • the drum cartridge 11A includes a photosensitive drum 4, a charging roller 5, and a transfer roller 9.
  • the developing cartridge 11B can be attached to the drum cartridge 11A.
  • the developing cartridge 11B includes a housing 7 and a developing roller 8.
  • Main body housing 2 The main body housing 2 houses the sheet supply unit 3, the photosensitive drum 4, the charging roller 5, the exposure device 6, the housing 7, the developing roller 8, the transfer roller 9, and the fixing device 10.
  • the sheet supply unit 3 supplies the sheet S to the photosensitive drum 4.
  • the photosensitive drum 4 will be described later.
  • the sheet supply unit 3 includes a sheet cassette 12, a pickup roller 13, and a transfer roller 14.
  • the sheet cassette 12 accommodates the sheet S.
  • Sheet S is, for example, printing paper.
  • the pickup roller 13 picks up the sheet S in the seat cassette 12 and conveys the picked up sheet S toward the transfer roller 14.
  • the transport roller 14 transports the sheet S from the pickup roller 13 toward the photosensitive drum 4.
  • Photosensitive drum 4 The photosensitive drum 4 is rotatable about the axis A.
  • the axis A extends in the first direction.
  • the photosensitive drum 4 extends in the first direction along the axis A.
  • the photosensitive drum 4 has a cylindrical shape.
  • the charging roller 5 is located on the opposite side of the transfer roller 9 with respect to the photosensitive drum 4. The charging roller 5 comes into contact with the surface of the photosensitive drum 4. A negative charging bias is applied to the charging roller 5. The charging roller 5 to which the negative charging bias is applied negatively charges the surface of the photosensitive drum 4.
  • Exposure device 6 forms an electrostatic latent image on the surface of the photosensitive drum 4 by exposing the surface of the photosensitive drum 4 charged by the charging roller 5.
  • the housing 7 can accommodate a non-magnetic one-component negatively charged toner.
  • the developing roller 8 can supply the toner in the housing 7 to the surface of the photosensitive drum 4.
  • the developing roller 8 is supported by the housing 7.
  • the developing roller 8 comes into contact with the photosensitive drum 4.
  • a negative development bias is applied to the developing roller 8.
  • the developing roller 8 is rotatable about an axis extending in the first direction.
  • Transfer roller 9 comes into contact with the photosensitive drum 4. A positive transfer bias is applied to the transfer roller 9. The sheet S from the sheet supply unit 3 passes between the photosensitive drum 4 and the transfer roller 9. At this time, the transfer roller 9 can transfer the toner image from the surface of the photosensitive drum 4 to the sheet S by the transfer bias.
  • the image forming apparatus 1 further includes a peeling roller 21, a charging cleaning roller 22, and a control unit 23.
  • the peeling roller 21 is provided on the drum cartridge 11A (see FIG. 1). The peeling roller 21 comes into contact with the surface of the photosensitive drum 4. The peeling roller 21 is rotatable about a shaft extending in the first direction. The peeling roller 21 extends in the first direction along the axis.
  • the peeling roller 21 is made of, for example, a silicone resin sponge.
  • the charged cleaning roller 22 comes into contact with the charged roller 5.
  • the charged cleaning roller 22 extends in the first direction.
  • the charged cleaning roller 22 is rotatable about a shaft extending in the first direction.
  • the charged cleaning roller 22 is driven by the charged roller 5. Therefore, the peripheral speed of the charging roller 5 is substantially the same as the peripheral speed of the photosensitive drum 4. Preferably, the peripheral speed of the charging roller 5 is the same as the peripheral speed of the photosensitive drum 4.
  • a negative cleaning bias having an absolute value equal to or less than the charging bias is applied to the charging cleaning roller 22.
  • the residual toner attached to the charging roller 5 is attached to the charging cleaning roller 22 from the charging roller 5 due to the cleaning bias.
  • the charged cleaning roller 22 cleans the charged roller 5.
  • the control unit 23 has, for example, an application specific integrated circuit (ASIC).
  • the control unit 23 may have a central processing unit (CPU).
  • the control unit 23 is electrically connected to the charging roller 5, the developing roller 8, the transfer roller 9, and the peeling roller 21.
  • the control unit 23 controls the charging bias, the developing bias, the transfer bias, and the peeling roller bias.
  • the developing method includes steps (S1) to (S8).
  • the image forming apparatus 1 executes the step (S1) as shown in FIG.
  • the image forming apparatus 1 supplies toner from the housing 7 to the photosensitive drum 4 by the developing roller 8.
  • the control unit 23 applies a development bias to the developing roller 8 at the time point t1.
  • the toner in the housing 7 is supplied to the surface of the photosensitive drum 4 on which the electrostatic latent image is formed by the developing roller 8 as described above. As a result, a toner image is formed on the surface of the photosensitive drum 4.
  • the image forming apparatus 1 executes the step (S2) as shown in FIG.
  • the image forming apparatus 1 transfers the toner on the surface of the photosensitive drum 4 to the sheet S by the transfer roller 9.
  • the control unit 23 applies the transfer bias to the transfer roller 9 at the time point t2 after the predetermined first time T1 elapses after applying the development bias to the developing roller 8. ..
  • the first time T1 is the time until the portion of the surface of the photosensitive drum 4 in contact with the developing roller 8 reaches the transfer roller 9.
  • the toner on the surface of the photosensitive drum 4 is transferred from the surface of the photosensitive drum 4 to the sheet S by the transfer bias.
  • the residual toner T is the residual toner T.
  • the image forming apparatus 1 executes the step (S3) as shown in FIG.
  • the image forming apparatus 1 applies the peeling roller bias to the peeling roller 21 in the step (S3).
  • a negative peeling roller bias is applied to the peeling roller 21.
  • the control unit 23 applies the development bias to the developing roller 8, and after a predetermined first time T1 elapses, the peeling roller bias at the time point t2. Is applied to the peeling roller 21.
  • the step (S3) may be executed at the same time as the step (S2), and the step (S3) may be executed after the step (S2).
  • the absolute value of the peeling roller bias is smaller than the charging bias and larger than the developing bias.
  • the difference between the absolute value of the peeling roller bias and the absolute value of the charging bias is, for example, 550 V or more and 700 V or less.
  • the difference between the absolute value of the peeling roller bias and the absolute value of the development bias is, for example, 100 V or more and 250 V or less.
  • the peeling roller bias is preferably a bias capable of generating an electric discharge between the peeling roller 21 and the photosensitive drum 4. With such a peeling roller bias, the residual toner can be more reliably negatively charged.
  • the image forming apparatus 1 executes the step (S4) as shown in FIG.
  • the image forming apparatus 1 peels off the residual toner on the surface of the photosensitive drum 4 from the surface of the photosensitive drum 4 by the peeling roller 21 in the step (S4), and makes the peeled residual toner negative.
  • the peeling roller 21 can peel off the residual toner T from the surface of the photosensitive drum 4 by the difference in peripheral speed between the peeling roller 21 and the photosensitive drum 4.
  • the peripheral speed of the peeling roller 21 is different from the peripheral speed of the photosensitive drum 4.
  • the peeling roller 21 rubs the surface of the photosensitive drum 4.
  • the peeling roller 21 peels the residual toner T from the surface of the photosensitive drum 4 by rubbing the photosensitive drum 4.
  • the peeling roller 21 negatively charges the peeled residual toner T by the peeling roller bias, and attaches the charged residual toner T to the surface of the photosensitive drum 4.
  • the residual toner T peeled from the surface of the photosensitive drum 4 by the peeling roller 21 is negatively charged by the peeling roller bias.
  • the residual toner T charged by the peeling roller 21 adheres to the surface of the photosensitive drum 4 due to the potential difference from the surface of the photosensitive drum 4.
  • the image forming apparatus 1 executes the step (S5) as shown in FIG.
  • the image forming apparatus 1 negatively charges the surface of the photosensitive drum 4 with the residual toner by the charging roller 5 as shown in FIG. 5B.
  • the control unit 23 applies a negative charging bias to the charging roller 5 at the time point t3.
  • the absolute value of the charge bias is larger than the absolute value of the peeling roller bias. Then, the surface of the photosensitive drum 4 is negatively charged by the charging roller 5.
  • the image forming apparatus 1 executes the step (S6) as shown in FIG.
  • the image forming apparatus 1 is charged by the charging roller 5 before the toner is supplied to the photosensitive drum 4 by the developing roller 8 by the exposure apparatus 6, as shown in FIG. 6A.
  • the surface of the is exposed.
  • an electrostatic latent image is formed on the surface of the photosensitive drum 4.
  • the image forming apparatus 1 executes the step (S7) as shown in FIG.
  • the image forming apparatus 1 applies a development bias to the developing roller 8 in the step (S7).
  • the control unit 23 applies the development bias to the developing roller 8 at the time point t4 after the predetermined second time T2 elapses after applying the charging bias to the charging roller 5.
  • the second time T2 is the time until the portion of the surface of the photosensitive drum 4 in contact with the charging roller 5 reaches the developing roller 8.
  • the image forming apparatus 1 executes the step (S8) as shown in FIG. As shown in FIG. 6B, the image forming apparatus 1 collects the residual toner to the housing 7 (see FIG. 1) by the developing roller 8 to which the developing bias is applied in the step (S8).
  • the step (S8) may be executed at the same time as the step (S1) in the next printing.
  • the developing roller 8 supplies the toner in the housing 7 to the region on the surface of the photosensitive drum 4 where the electrostatic latent image is formed (S1), and at the same time, the electrostatic on the surface of the photosensitive drum 4.
  • the residual toner adhering to the region where the latent image is not formed is collected in the housing 7 (S8).
  • the residual toner attached to the region of the surface of the photosensitive drum 4 on which the electrostatic latent image is formed is used for the next printing together with the toner supplied from the housing 7.
  • the residual toner peeled off from the surface of the photosensitive drum 4 is charged by the peeling roller 21 to be attached to the surface of the photosensitive drum 4, and is collected in the housing 7 by the developing roller 8 as shown in FIG. 6B. ..
  • the residual toner can be recovered by using the developing roller 8 while suppressing the filming of the surface of the photosensitive drum 4.
  • the drum cartridge 11A may include a cleaning roller 30.
  • the cleaning roller 30 comes into contact with the charged cleaning roller 22.
  • the cleaning roller 30 is rotatable about an axis extending in the first direction.
  • the cleaning roller 30 extends in the first direction along the axis.
  • the cleaning roller 30 has a spiral groove on the peripheral surface.
  • the cleaning roller 30 collects the paper dust attached to the charged cleaning roller 22.
  • the peripheral speed of the charged cleaning roller 22 and the peripheral speed of the charged roller 5 are different.
  • a negative first cleaning bias having an absolute value smaller than the charging bias is applied to the charging cleaning roller 22.
  • a negative second cleaning bias having an absolute value smaller than that of the first cleaning bias is applied to the cleaning roller 30.
  • the cleaning roller 30 is an example of a cleaner member.
  • the cleaner member may be a cleaning blade.
  • the image forming apparatus 1 may include a toner cartridge that can be attached to the developing cartridge 11B.
  • the developing cartridge 11B includes the housing 7 and the developing roller 8 described above.
  • the toner cartridge can be mounted on the housing 7 of the developing cartridge 11B.
  • the toner cartridge accommodates the toner supplied to the housing 7.
  • the drum cartridge 11A may include a photosensitive drum 4, a charging roller 5, a developing device, and a transfer roller 9.
  • the developing device includes a housing 7 and a developing roller 8.
  • the image forming apparatus 1 may include a toner cartridge that can be attached to the drum cartridge 11A.
  • the image forming apparatus 1 may include a cartridge including a drum unit and a developing device as a unit.
  • the drum unit includes a photosensitive drum 4, a charging roller 5, and a transfer roller 9.
  • the developing device includes a housing 7 and a developing roller 8.

Abstract

Provided are a development method and an image forming apparatus which can collect residual toner using a development roller while suppressing film formation on the surface of a photosensitive drum. The development method comprises: a step (S1) for supplying non-magnetic one-component negative charging toner from a housing 7 to a photosensitive drum 4 by means of a development roller 8; a step (S2) for transferring the toner on the surface of the photosensitive drum 4 to a sheet S by means of a transfer roller 9; a step (S4) for peeling off residual toner T adhering to the surface of the photosensitive drum 4 from the surface of the photosensitive drum 4 by means of a peeling roller 21 and attaching the peeled residual toner T to the surface of the photosensitive drum 4; a step (S5) for charging, by means of a charging roller 5, the surface of the photosensitive drum 4 to which the residual toner T adheres; and a step (S8) for collecting the residual toner T in the housing 7 by means of the development roller 8.

Description

現像方法および画像形成装置Development method and image forming equipment
　本開示は、現像方法および画像形成装置に関する。 The present disclosure relates to a developing method and an image forming apparatus.
　従来、負帯電性のトナーを用いた、いわゆるクリーナレスの現像方法が、知られている。クリーナレスの現像方法は、現像ローラにより、トナーを筐体から感光ドラムへ供給する工程と、転写ローラにより、感光ドラムの表面のトナーをシートへ転写する工程と、帯電ローラにより、残トナーが付いた感光ドラムの表面を帯電させる工程と、現像ローラにより、残トナーを筐体へ回収する工程とを含む（下記特許文献１参照）。 Conventionally, a so-called cleanerless development method using a negatively charged toner is known. The cleanerless development method includes a step of supplying toner from the housing to the photosensitive drum by the developing roller, a step of transferring the toner on the surface of the photosensitive drum to the sheet by the transfer roller, and a residual toner by the charging roller. It includes a step of charging the surface of the photosensitive drum and a step of collecting the residual toner to the housing by a developing roller (see Patent Document 1 below).
特開２００６－１１１３７号公報Japanese Unexamined Patent Publication No. 2006-11137
　上記した特許文献１に記載されるような現像方法では、印刷枚数が増加するに従って、感光ドラムの表面にフィルミングが発生する可能性がある。感光ドラムの表面にフィルミングが発生すると、画質が低下する可能性がある。 In the developing method as described in Patent Document 1 described above, filming may occur on the surface of the photosensitive drum as the number of printed sheets increases. If filming occurs on the surface of the photosensitive drum, the image quality may deteriorate.
　そこで、本開示の目的は、感光ドラムの表面のフィルミングを抑制しつつ、現像ローラを用いて、残トナーを回収できる現像方法および画像形成装置を提供することにある。 Therefore, an object of the present disclosure is to provide a developing method and an image forming apparatus capable of recovering residual toner by using a developing roller while suppressing filming on the surface of the photosensitive drum.
　（１）本開示の現像方法は、負の現像バイアスが印加された現像ローラにより、非磁性一成分系の負帯電性トナーを収容可能な筐体から、トナーを感光ドラムへ供給する工程と、正の転写バイアスが印加された転写ローラにより、感光ドラムの表面のトナーを、シートへ転写する工程と、感光ドラムの表面に付いた残トナーを、剥がしローラと感光ドラムとの周速差によって、感光ドラムの表面から剥がし、現像バイアスよりも絶対値が大きい負の剥がしローラバイアスであって剥がしローラに印加された剥がしローラバイアスにより、剥がした残トナーを負に帯電させて、帯電された残トナーを感光ドラムの表面に付ける工程と、剥がしローラバイアスよりも絶対値が大きい負の帯電バイアスが印加された帯電ローラにより、残トナーが付いた感光ドラムの表面を負に帯電させる工程と、現像バイアスが印加された現像ローラにより、残トナーを筐体へ回収する工程とを含む。 (1) The developing method of the present disclosure includes a step of supplying toner to a photosensitive drum from a housing capable of accommodating a non-magnetic one-component negatively charged toner by a developing roller to which a negative development bias is applied. The process of transferring the toner on the surface of the photosensitive drum to the sheet by the transfer roller to which a positive transfer bias is applied and the residual toner on the surface of the photosensitive drum are removed by the difference in peripheral speed between the roller and the photosensitive drum. It is a negative peeling roller bias that is peeled off from the surface of the photosensitive drum and has a larger absolute value than the development bias. The peeling roller bias applied to the peeling roller negatively charges the peeled residual toner, and the charged residual toner is charged. The process of applying the toner to the surface of the photosensitive drum, the process of negatively charging the surface of the photosensitive drum with residual toner by the charging roller to which a negative charging bias having an absolute value larger than the peeling roller bias is applied, and the development bias. Includes a step of collecting the residual toner to the housing by the developing roller to which is applied.
　このような方法によれば、感光ドラムの表面に付いた残トナーを、剥がしローラによって、感光ドラムの表面から剥がす。 According to such a method, the residual toner adhering to the surface of the photosensitive drum is peeled off from the surface of the photosensitive drum by a peeling roller.
　これにより、感光ドラムの表面のフィルミングを抑制できる。 This makes it possible to suppress the filming of the surface of the photosensitive drum.
　そして、感光ドラムの表面から剥がした残トナーを、剥がしローラによって帯電させることにより、感光ドラムの表面に付けて、現像ローラによって筐体内に回収する。 Then, the residual toner peeled off from the surface of the photosensitive drum is charged by the peeling roller, attached to the surface of the photosensitive drum, and collected in the housing by the developing roller.
　そのため、残トナーを回収するための容器を別途設ける必要がない。 Therefore, it is not necessary to separately provide a container for collecting the residual toner.
　総括すると、感光ドラムの表面のフィルミングを抑制しつつ、現像ローラを用いて、残トナーを回収できる。 In summary, the residual toner can be recovered using a developing roller while suppressing the filming of the surface of the photosensitive drum.
　（２）剥がしローラにより帯電された残トナーは、感光ドラムの表面との電位差により、感光ドラムの表面に付く。 (2) The residual toner charged by the peeling roller adheres to the surface of the photosensitive drum due to the potential difference from the surface of the photosensitive drum.
　（３）現像方法は、現像バイアスを現像ローラに印加した後、所定の第１時間が経過した後に、正の転写バイアスを転写ローラに印加するとともに、剥がしローラバイアスを剥がしローラに印加する工程と、帯電バイアスを帯電ローラに印加した後、所定の第２時間が経過した後に、現像バイアスを現像ローラに印加する工程と、をさらに含んでもよい。 (3) The development method is a step of applying a development bias to the development roller and then applying a positive transfer bias to the transfer roller and applying the peeling roller bias to the peeling roller after a predetermined first time has elapsed. , A step of applying the development bias to the development roller after a predetermined second time has elapsed after applying the charge bias to the charge roller may be further included.
　（４）現像方法は、現像ローラによってトナーが感光ドラムに供給される前に、帯電ローラによって帯電された感光ドラムの表面を露光することにより、感光ドラムの表面に静電潜像を形成する工程を、さらに含んでもよい。 (4) The developing method is a step of forming an electrostatic latent image on the surface of the photosensitive drum by exposing the surface of the photosensitive drum charged by the charging roller before the toner is supplied to the photosensitive drum by the developing roller. May be further included.
　（５）本開示の画像形成装置は、筐体と、感光ドラムと、現像ローラと、転写ローラと、剥がしローラと、帯電ローラとを備える。筐体は、非磁性一成分系の負帯電性トナーを収容可能である。トナーで作られたトナー像は、感光ドラムの表面に形成される。現像ローラには、負の現像バイアスが、印加される。現像ローラは、筐体内のトナーを感光ドラムの表面に供給可能である。転写ローラは、正の転写バイアスが印加される。転写ローラは、感光ドラムの表面からシートにトナー像を転写可能である。剥がしローラには、現像バイアスよりも絶対値が大きい負の剥がしローラバイアスが印加される。剥がしローラは、シートに転写されずに感光ドラムの表面に残った残トナーを、剥がしローラと感光ドラムとの周速差によって、感光ドラムの表面から剥がすことが可能である。剥がしローラは、剥がした残トナーを剥がしローラバイアスにより負に帯電させて、帯電した残トナーを感光ドラムの表面に付ける。帯電ローラには、剥がしローラバイアスよりも絶対値が大きい負の帯電バイアスが、印加される。帯電ローラは、残トナーが付いた感光ドラムの表面を負に帯電させる。 (5) The image forming apparatus of the present disclosure includes a housing, a photosensitive drum, a developing roller, a transfer roller, a peeling roller, and a charging roller. The housing can accommodate a non-magnetic one-component negatively charged toner. A toner image made of toner is formed on the surface of the photosensitive drum. A negative development bias is applied to the developing roller. The developing roller can supply the toner in the housing to the surface of the photosensitive drum. A positive transfer bias is applied to the transfer roller. The transfer roller can transfer the toner image from the surface of the photosensitive drum to the sheet. A negative peeling roller bias having an absolute value larger than the development bias is applied to the peeling roller. The peeling roller can peel off the residual toner remaining on the surface of the photosensitive drum without being transferred to the sheet from the surface of the photosensitive drum due to the difference in peripheral speed between the peeling roller and the photosensitive drum. The peeling roller removes the peeled residual toner and negatively charges it by the roller bias, and attaches the charged residual toner to the surface of the photosensitive drum. A negative charging bias having a larger absolute value than the peeling roller bias is applied to the charging roller. The charging roller negatively charges the surface of the photosensitive drum with the residual toner.
　画像形成装置は、現像バイアスが印加される現像ローラにより、残トナーを筐体に回収する。 The image forming apparatus collects the residual toner in the housing by the developing roller to which the developing bias is applied.
　（６）画像形成装置は、さらに、制御部を備えてもよい。制御部は、現像バイアスを現像ローラに印加した後、所定の第１時間が経過した後に、正の転写バイアスを転写ローラに印加するとともに、剥がしローラバイアスを剥がしローラに印加する。制御部は、帯電バイアスを帯電ローラに印加した後、所定の第２時間が経過した後に、現像バイアスを現像ローラに印加する。 (6) The image forming apparatus may further include a control unit. After applying the development bias to the developing roller, the control unit applies a positive transfer bias to the transfer roller and applies the peeling roller bias to the peeling roller after a predetermined first time has elapsed. The control unit applies the development bias to the developing roller after a predetermined second time has elapsed after applying the charging bias to the charging roller.
　（７）画像形成装置は、さらに、露光装置を備えてもよい。露光装置は、現像ローラによってトナーが感光ドラムに供給される前に、帯電ローラによって帯電された感光ドラムの表面を露光することにより、感光ドラムの表面に静電潜像を形成する。 (7) The image forming apparatus may further include an exposure apparatus. The exposure apparatus forms an electrostatic latent image on the surface of the photosensitive drum by exposing the surface of the photosensitive drum charged by the charging roller before the toner is supplied to the photosensitive drum by the developing roller.
　（８）画像形成装置は、さらに、帯電クリーニングローラを備えてもよい。帯電クリーニングローラは、帯電ローラをクリーニングする。 (8) The image forming apparatus may further include a charged cleaning roller. The charged cleaning roller cleans the charged roller.
　（９）帯電クリーニングローラは、帯電ローラと従動してもよい。帯電クリーニングローラには、帯電バイアス以下の絶対値を有する負のクリーニングバイアスが印加されてもよい。 (9) The charged cleaning roller may be driven by the charged roller. A negative cleaning bias having an absolute value equal to or less than the charging bias may be applied to the charging cleaning roller.
　（１０）画像形成装置は、さらに、クリーナー部材を備えてもよい。クリーナー部材は、帯電クリーニングローラと接触し、帯電クリーニングローラに付いた紙粉を回収する。 (10) The image forming apparatus may further include a cleaner member. The cleaner member comes into contact with the charged cleaning roller and collects the paper dust attached to the charged cleaning roller.
　（１１）帯電クリーニングローラの周速と帯電ローラの周速とは異なってもよい。帯電クリーニングローラには、帯電バイアスよりも絶対値が小さい負の第１クリーニングバイアスが印加されてもよい。クリーナー部材には、第１クリーニングバイアスよりも絶対値が小さい負の第２クリーニングバイアスが印加されてもよい。 (11) The peripheral speed of the charged cleaning roller and the peripheral speed of the charged roller may be different. A negative first cleaning bias having an absolute value smaller than the charging bias may be applied to the charging cleaning roller. A negative second cleaning bias having an absolute value smaller than that of the first cleaning bias may be applied to the cleaner member.
　（１２）画像形成装置は、ドラムカートリッジと、現像カートリッジとを備えてもよい。ドラムカートリッジは、感光ドラムと、帯電ローラと、剥がしローラとを備える。現像カートリッジは、ドラムカートリッジに装着可能である。現像カートリッジは、筐体と現像ローラとを備える。 (12) The image forming apparatus may include a drum cartridge and a developing cartridge. The drum cartridge includes a photosensitive drum, a charging roller, and a peeling roller. The developing cartridge can be attached to the drum cartridge. The developing cartridge includes a housing and a developing roller.
　（１３）ドラムカートリッジは、さらに、転写ローラを備えてもよい。 (13) The drum cartridge may further include a transfer roller.
　本開示の現像方法および画像形成装置によれば、感光ドラムの表面のフィルミングを抑制しつつ、現像ローラを用いて、残トナーを回収できる。 According to the developing method and the image forming apparatus of the present disclosure, the residual toner can be recovered by using the developing roller while suppressing the filming of the surface of the photosensitive drum.
図１は、画像形成装置の概略構成図である。FIG. 1 is a schematic configuration diagram of an image forming apparatus. 図２は、帯電ローラ、現像ローラ、転写ローラおよび剥がしローラのそれぞれと制御部との電気的な接続を説明する説明図である。FIG. 2 is an explanatory diagram illustrating an electrical connection between each of the charging roller, the developing roller, the transfer roller, and the peeling roller and the control unit. 図３は、現像方法を説明するためのフローチャートである。FIG. 3 is a flowchart for explaining a developing method. 図４Ａは、図３の現像工程を説明するための説明図である。図４Ｂは、図３の転写工程を説明するための説明図である。FIG. 4A is an explanatory diagram for explaining the developing process of FIG. FIG. 4B is an explanatory diagram for explaining the transfer process of FIG. 図５Ａは、図３の剥がし工程を説明するための説明図である。図５Ｂは、図３の帯電工程を説明するための説明図である。FIG. 5A is an explanatory diagram for explaining the peeling process of FIG. FIG. 5B is an explanatory diagram for explaining the charging process of FIG. 図６Ａは、図３の露光工程を説明するための説明図である。図６Ｂは、図３の回収工程を説明するための説明図である。FIG. 6A is an explanatory diagram for explaining the exposure process of FIG. FIG. 6B is an explanatory diagram for explaining the recovery process of FIG. 図７は、帯電ローラに帯電バイアスを印加するタイミング、現像ローラに現像バイアスを印加するタイミング、転写ローラに転写バイアスを印加するタイミングおよび剥がしローラに剥がしローラバイアスを印加するタイミングを説明するためのタイミングチャートである。FIG. 7 shows the timing for applying the charging bias to the charging roller, the timing for applying the development bias to the developing roller, the timing for applying the transfer bias to the transfer roller, and the timing for applying the peeling roller bias to the peeling roller. It is a chart. 図８は、変形例を説明するための説明図である。FIG. 8 is an explanatory diagram for explaining a modified example.
　１．画像形成装置１の概略
　図１を参照して、画像形成装置１の概略について説明する。 1. 1. Schematic of the image forming apparatus 1 The outline of the image forming apparatus 1 will be described with reference to FIG.
　画像形成装置１は、本体筐体２と、シート供給部３と、感光ドラム４と、帯電ローラ５と、露光装置６と、筐体７と、現像ローラ８と、転写ローラ９と、定着装置１０とを備える。なお、本実施形態では、画像形成装置１は、ドラムカートリッジ１１Ａと、現像カートリッジ１１Ｂとを備える。ドラムカートリッジ１１Ａは、感光ドラム４と、帯電ローラ５と、転写ローラ９とを備える。現像カートリッジ１１Ｂは、ドラムカートリッジ１１Ａに装着可能である。現像カートリッジ１１Ｂは、筐体７と、現像ローラ８とを備える。 The image forming apparatus 1 includes a main body housing 2, a sheet supply unit 3, a photosensitive drum 4, a charging roller 5, an exposure device 6, a housing 7, a developing roller 8, a transfer roller 9, and a fixing device. It is provided with 10. In the present embodiment, the image forming apparatus 1 includes a drum cartridge 11A and a developing cartridge 11B. The drum cartridge 11A includes a photosensitive drum 4, a charging roller 5, and a transfer roller 9. The developing cartridge 11B can be attached to the drum cartridge 11A. The developing cartridge 11B includes a housing 7 and a developing roller 8.
　１．１　本体筐体２
　本体筐体２は、シート供給部３と、感光ドラム４と、帯電ローラ５と、露光装置６と、筐体７と、現像ローラ８と、転写ローラ９と、定着装置１０とを収容する。 1.1 Main body housing 2
The main body housing 2 houses the sheet supply unit 3, the photosensitive drum 4, the charging roller 5, the exposure device 6, the housing 7, the developing roller 8, the transfer roller 9, and the fixing device 10.
　１．２　シート供給部３
　シート供給部３は、感光ドラム４にシートＳを供給する。感光ドラム４については後述する。シート供給部３は、シートカセット１２と、ピックアップローラ１３と、搬送ローラ１４とを備える。シートカセット１２は、シートＳを収容する。シートＳは、例えば、印刷用紙である。ピックアップローラ１３は、シートカセット１２内のシートＳをピックアップして、ピックアップしたシートＳを搬送ローラ１４に向かって搬送する。搬送ローラ１４は、ピックアップローラ１３からのシートＳを感光ドラム４に向かって搬送する。 1.2 Sheet supply unit 3
The sheet supply unit 3 supplies the sheet S to the photosensitive drum 4. The photosensitive drum 4 will be described later. The sheet supply unit 3 includes a sheet cassette 12, a pickup roller 13, and a transfer roller 14. The sheet cassette 12 accommodates the sheet S. Sheet S is, for example, printing paper. The pickup roller 13 picks up the sheet S in the seat cassette 12 and conveys the picked up sheet S toward the transfer roller 14. The transport roller 14 transports the sheet S from the pickup roller 13 toward the photosensitive drum 4.
　１．３　感光ドラム４
　感光ドラム４は、軸Ａについて回転可能である。軸Ａは、第１方向に延びる。感光ドラム４は、軸Ａに沿って第１方向に延びる。感光ドラム４は、円筒形状を有する。 1.3 Photosensitive drum 4
The photosensitive drum 4 is rotatable about the axis A. The axis A extends in the first direction. The photosensitive drum 4 extends in the first direction along the axis A. The photosensitive drum 4 has a cylindrical shape.
　１．４　帯電ローラ５
　帯電ローラ５は、感光ドラム４に対して、転写ローラ９の反対側に位置する。帯電ローラ５は、感光ドラム４の表面に接触する。帯電ローラ５には、負の帯電バイアスが印加される。負の帯電バイアスが印加された帯電ローラ５は、感光ドラム４の表面を負に帯電させる。 1.4 Charging roller 5
The charging roller 5 is located on the opposite side of the transfer roller 9 with respect to the photosensitive drum 4. The charging roller 5 comes into contact with the surface of the photosensitive drum 4. A negative charging bias is applied to the charging roller 5. The charging roller 5 to which the negative charging bias is applied negatively charges the surface of the photosensitive drum 4.
　１．５　露光装置６
　露光装置６は、帯電ローラ５によって帯電された感光ドラム４の表面を露光することにより、感光ドラム４の表面に静電潜像を形成する。 1.5 Exposure device 6
The exposure apparatus 6 forms an electrostatic latent image on the surface of the photosensitive drum 4 by exposing the surface of the photosensitive drum 4 charged by the charging roller 5.
　１．７　筐体７
　筐体７は、非磁性一成分系の負帯電性トナーを収容可能である。 1.7 Housing 7
The housing 7 can accommodate a non-magnetic one-component negatively charged toner.
　１．８　現像ローラ８
　現像ローラ８は、筐体７内のトナーを感光ドラム４の表面に供給可能である。現像ローラ８は、筐体７に支持される。現像ローラ８は、感光ドラム４に接触する。現像ローラ８には、負の現像バイアスが、印加される。現像ローラ８は、第１方向に延びる軸について回転可能である。現像ローラ８によって筐体７内のトナーが感光ドラム４の表面に供給されることにより、感光ドラム４の表面に、トナーで作られたトナー像が形成される。 1.8 Develop roller 8
The developing roller 8 can supply the toner in the housing 7 to the surface of the photosensitive drum 4. The developing roller 8 is supported by the housing 7. The developing roller 8 comes into contact with the photosensitive drum 4. A negative development bias is applied to the developing roller 8. The developing roller 8 is rotatable about an axis extending in the first direction. By supplying the toner in the housing 7 to the surface of the photosensitive drum 4 by the developing roller 8, a toner image made of the toner is formed on the surface of the photosensitive drum 4.
　１．９　転写ローラ９
　転写ローラ９は、感光ドラム４に接触する。転写ローラ９には、正の転写バイアスが印加される。シート供給部３からのシートＳは、感光ドラム４と転写ローラ９との間を通る。このとき、転写ローラ９は、転写バイアスにより、感光ドラム４の表面からシートＳにトナー像を転写可能である。 1.9 Transfer roller 9
The transfer roller 9 comes into contact with the photosensitive drum 4. A positive transfer bias is applied to the transfer roller 9. The sheet S from the sheet supply unit 3 passes between the photosensitive drum 4 and the transfer roller 9. At this time, the transfer roller 9 can transfer the toner image from the surface of the photosensitive drum 4 to the sheet S by the transfer bias.
　１．１０　定着装置１０
　定着装置１０は、トナー像が転写されたシートＳを加熱および加圧して、シートＳにトナー像を定着させる。定着装置１０を通過したシートＳは、本体筐体２の上面に排出される。 1.10 Fixing device 10
The fixing device 10 heats and pressurizes the sheet S on which the toner image is transferred to fix the toner image on the sheet S. The sheet S that has passed through the fixing device 10 is discharged to the upper surface of the main body housing 2.
　２．画像形成装置の詳細
　次に、図２を参照して、画像形成装置１の詳細について説明する。 2. 2. Details of the image forming apparatus Next, the details of the image forming apparatus 1 will be described with reference to FIG.
　図２に示すように、画像形成装置１は、さらに、剥がしローラ２１と、帯電クリーニングローラ２２と、制御部２３とを備える。 As shown in FIG. 2, the image forming apparatus 1 further includes a peeling roller 21, a charging cleaning roller 22, and a control unit 23.
　２．１　剥がしローラ２１
　剥がしローラ２１は、ドラムカートリッジ１１Ａ（図１参照）に備えられる。剥がしローラ２１は、感光ドラム４の表面と接触する。剥がしローラ２１は、第１方向に延びる軸について回転可能である。剥がしローラ２１は、軸に沿って第１方向に延びる。剥がしローラ２１は、例えば、シリコーン樹脂のスポンジから作られる。 2.1 Peeling roller 21
The peeling roller 21 is provided on the drum cartridge 11A (see FIG. 1). The peeling roller 21 comes into contact with the surface of the photosensitive drum 4. The peeling roller 21 is rotatable about a shaft extending in the first direction. The peeling roller 21 extends in the first direction along the axis. The peeling roller 21 is made of, for example, a silicone resin sponge.
　２．３　帯電クリーニングローラ２２
　帯電クリーニングローラ２２は、帯電ローラ５と接触する。帯電クリーニングローラ２２は、第１方向に延びる。帯電クリーニングローラ２２は、第１方向に延びる軸について回転可能である。 2.3 Charged cleaning roller 22
The charged cleaning roller 22 comes into contact with the charged roller 5. The charged cleaning roller 22 extends in the first direction. The charged cleaning roller 22 is rotatable about a shaft extending in the first direction.
　帯電クリーニングローラ２２は、帯電ローラ５と従動する。そのため、帯電ローラ５の周速は、感光ドラム４の周速と、ほぼ同じである。好ましくは、帯電ローラ５の周速は、感光ドラム４の周速と同じである。 The charged cleaning roller 22 is driven by the charged roller 5. Therefore, the peripheral speed of the charging roller 5 is substantially the same as the peripheral speed of the photosensitive drum 4. Preferably, the peripheral speed of the charging roller 5 is the same as the peripheral speed of the photosensitive drum 4.
　また、帯電クリーニングローラ２２には、帯電バイアス以下の絶対値を有する負のクリーニングバイアスが印加される。帯電ローラ５に付いた残トナーは、クリーニングバイアスにより、帯電ローラ５から帯電クリーニングローラ２２に付く。これにより、帯電クリーニングローラ２２は、帯電ローラ５をクリーニングする。 Further, a negative cleaning bias having an absolute value equal to or less than the charging bias is applied to the charging cleaning roller 22. The residual toner attached to the charging roller 5 is attached to the charging cleaning roller 22 from the charging roller 5 due to the cleaning bias. As a result, the charged cleaning roller 22 cleans the charged roller 5.
　２．４　制御部２３
　制御部２３は、例えば、特定用途向け集積回路（ＡＳＩＣ）を有する。なお、制御部２３は、中央演算処理装置（ＣＰＵ）を有してもよい。制御部２３は、帯電ローラ５、現像ローラ８、転写ローラ９および剥がしローラ２１と電気的に接続する。制御部２３は、帯電バイアス、現像バイアス、転写バイアスおよび剥がしローラバイアスを制御する。 2.4 Control unit 23
The control unit 23 has, for example, an application specific integrated circuit (ASIC). The control unit 23 may have a central processing unit (CPU). The control unit 23 is electrically connected to the charging roller 5, the developing roller 8, the transfer roller 9, and the peeling roller 21. The control unit 23 controls the charging bias, the developing bias, the transfer bias, and the peeling roller bias.
　３．現像方法
　次に、図３から図７を参照して、現像方法について説明する。 3. 3. Development Method Next, the development method will be described with reference to FIGS. 3 to 7.
　図３に示すように、現像方法は、工程（Ｓ１）から工程（Ｓ８）を含む。 As shown in FIG. 3, the developing method includes steps (S1) to (S8).
　３．１　現像工程（Ｓ１）
　まず、画像形成装置１は、図３に示すように、工程（Ｓ１）を実行する。画像形成装置１は、工程（Ｓ１）において、現像ローラ８により、筐体７から、トナーを感光ドラム４へ供給する。詳しくは、図７に示すように、制御部２３（図２参照）は、時点ｔ１において、現像ローラ８に現像バイアスを印加する。すると、図４Ａに示すように、筐体７内のトナーは、上記したように、現像ローラ８により、静電潜像が形成された感光ドラム４の表面に供給される。これにより、感光ドラム４の表面にトナー像が形成される。 3.1 Development process (S1)
First, the image forming apparatus 1 executes the step (S1) as shown in FIG. In the step (S1), the image forming apparatus 1 supplies toner from the housing 7 to the photosensitive drum 4 by the developing roller 8. Specifically, as shown in FIG. 7, the control unit 23 (see FIG. 2) applies a development bias to the developing roller 8 at the time point t1. Then, as shown in FIG. 4A, the toner in the housing 7 is supplied to the surface of the photosensitive drum 4 on which the electrostatic latent image is formed by the developing roller 8 as described above. As a result, a toner image is formed on the surface of the photosensitive drum 4.
　３．２　転写工程（Ｓ２）
　次に、画像形成装置１は、図３に示すように、工程（Ｓ２）を実行する。画像形成装置１は、工程（Ｓ２）において、転写ローラ９により、感光ドラム４の表面のトナーを、シートＳへ転写する。詳しくは、制御部２３は、図７に示すように、現像バイアスを現像ローラ８に印加した後、所定の第１時間Ｔ１が経過した後に、時点ｔ２において、転写バイアスを転写ローラ９に印加する。第１時間Ｔ１は、感光ドラム４の表面のうちの現像ローラ８と接触した部分が、転写ローラ９に到達するまでの時間である。すると、図４Ｂに示すように、感光ドラム４の表面のトナーは、転写バイアスにより、感光ドラム４の表面からシートＳに転写される。このとき、感光ドラム４の表面のトナーの一部は、シートＳに転写されずに感光ドラム４の表面に残る。シートＳに転写されずに感光ドラム４の表面に残ったトナーが、残トナーＴである。 3.2 Transfer step (S2)
Next, the image forming apparatus 1 executes the step (S2) as shown in FIG. In the step (S2), the image forming apparatus 1 transfers the toner on the surface of the photosensitive drum 4 to the sheet S by the transfer roller 9. Specifically, as shown in FIG. 7, the control unit 23 applies the transfer bias to the transfer roller 9 at the time point t2 after the predetermined first time T1 elapses after applying the development bias to the developing roller 8. .. The first time T1 is the time until the portion of the surface of the photosensitive drum 4 in contact with the developing roller 8 reaches the transfer roller 9. Then, as shown in FIG. 4B, the toner on the surface of the photosensitive drum 4 is transferred from the surface of the photosensitive drum 4 to the sheet S by the transfer bias. At this time, a part of the toner on the surface of the photosensitive drum 4 remains on the surface of the photosensitive drum 4 without being transferred to the sheet S. The toner remaining on the surface of the photosensitive drum 4 without being transferred to the sheet S is the residual toner T.
　３．３　剥がしローラバイアスを印加する工程（Ｓ３）
　また、画像形成装置１は、図３に示すように、工程（Ｓ３）を実行する。画像形成装置１は、工程（Ｓ３）において、剥がしローラバイアスを、剥がしローラ２１に印加する。
剥がしローラ２１には、負の剥がしローラバイアスが印加される。詳しくは、工程（Ｓ３）において、制御部２３は、図７に示すように、現像バイアスを現像ローラ８に印加した後、所定の第１時間Ｔ１が経過した後に、時点ｔ２において、剥がしローラバイアスを剥がしローラ２１に印加する。なお、工程（Ｓ３）は、工程（Ｓ２）と同時に実行してもよく、工程（Ｓ３）は、工程（Ｓ２）の後に実行してもよい。 3.3 Step of applying peeling roller bias (S3)
Further, the image forming apparatus 1 executes the step (S3) as shown in FIG. The image forming apparatus 1 applies the peeling roller bias to the peeling roller 21 in the step (S3).
A negative peeling roller bias is applied to the peeling roller 21. Specifically, in the step (S3), as shown in FIG. 7, the control unit 23 applies the development bias to the developing roller 8, and after a predetermined first time T1 elapses, the peeling roller bias at the time point t2. Is applied to the peeling roller 21. The step (S3) may be executed at the same time as the step (S2), and the step (S3) may be executed after the step (S2).
　剥がしローラバイアスの絶対値は、帯電バイアスよりも小さく、現像バイアスよりも大きい。剥がしローラバイアスの絶対値と帯電バイアスの絶対値との差は、例えば、５５０Ｖ以上、７００Ｖ以下である。剥がしローラバイアスの絶対値と現像バイアスの絶対値との差は、例えば、１００Ｖ以上、２５０Ｖ以下である。 The absolute value of the peeling roller bias is smaller than the charging bias and larger than the developing bias. The difference between the absolute value of the peeling roller bias and the absolute value of the charging bias is, for example, 550 V or more and 700 V or less. The difference between the absolute value of the peeling roller bias and the absolute value of the development bias is, for example, 100 V or more and 250 V or less.
　なお、剥がしローラバイアスは、好ましくは、剥がしローラ２１と感光ドラム４との間で放電を発生可能なバイアスである。このような剥がしローラバイアスであると、残トナーを、より確実に、負に帯電させることができる。 The peeling roller bias is preferably a bias capable of generating an electric discharge between the peeling roller 21 and the photosensitive drum 4. With such a peeling roller bias, the residual toner can be more reliably negatively charged.
　３．４　剥がし工程（Ｓ４）
　次に、画像形成装置１は、図３に示すように、工程（Ｓ４）を実行する。画像形成装置１は、図５Ａに示すように、工程（Ｓ４）において、剥がしローラ２１により、感光ドラム４の表面に付いた残トナーを感光ドラム４の表面から剥がし、剥がした残トナーを負に帯電させる。詳しくは、剥がしローラ２１は、剥がしローラ２１と感光ドラム４との周速差によって、残トナーＴを、感光ドラム４の表面から剥がすことが可能である。剥がしローラ２１の周速は、感光ドラム４の周速と異なる。これにより、剥がしローラ２１は、感光ドラム４の表面を擦る。剥がしローラ２１は、感光ドラム４を擦ることにより、残トナーＴを、感光ドラム４の表面から剥がす。 3.4 Peeling process (S4)
Next, the image forming apparatus 1 executes the step (S4) as shown in FIG. As shown in FIG. 5A, the image forming apparatus 1 peels off the residual toner on the surface of the photosensitive drum 4 from the surface of the photosensitive drum 4 by the peeling roller 21 in the step (S4), and makes the peeled residual toner negative. Charge. Specifically, the peeling roller 21 can peel off the residual toner T from the surface of the photosensitive drum 4 by the difference in peripheral speed between the peeling roller 21 and the photosensitive drum 4. The peripheral speed of the peeling roller 21 is different from the peripheral speed of the photosensitive drum 4. As a result, the peeling roller 21 rubs the surface of the photosensitive drum 4. The peeling roller 21 peels the residual toner T from the surface of the photosensitive drum 4 by rubbing the photosensitive drum 4.
　そして、剥がしローラ２１は、剥がしローラバイアスによって、剥がした残トナーＴを負に帯電させて、帯電された残トナーＴを感光ドラム４の表面に付ける。詳しくは、剥がしローラ２１により感光ドラム４の表面から剥がされた残トナーＴは、剥がしローラバイアスにより、負に帯電する。剥がしローラ２１により帯電された残トナーＴは、感光ドラム４の表面との電位差により、感光ドラム４の表面に付く。 Then, the peeling roller 21 negatively charges the peeled residual toner T by the peeling roller bias, and attaches the charged residual toner T to the surface of the photosensitive drum 4. Specifically, the residual toner T peeled from the surface of the photosensitive drum 4 by the peeling roller 21 is negatively charged by the peeling roller bias. The residual toner T charged by the peeling roller 21 adheres to the surface of the photosensitive drum 4 due to the potential difference from the surface of the photosensitive drum 4.
　３．５　帯電工程（Ｓ５）
　次に、画像形成装置１は、図３に示すように、工程（Ｓ５）を実行する。画像形成装置１は、工程（Ｓ５）において、図５Ｂに示すように、帯電ローラ５により、残トナーが付いた感光ドラム４の表面を負に帯電させる。詳しくは、図７に示すように、制御部２３は、時点ｔ３において、帯電ローラ５に負の帯電バイアスを印加する。帯電バイアスの絶対値は、剥がしローラバイアスの絶対値よりも大きい。すると、感光ドラム４の表面は、帯電ローラ５によって負に帯電する。 3.5 Charging step (S5)
Next, the image forming apparatus 1 executes the step (S5) as shown in FIG. In the step (S5), the image forming apparatus 1 negatively charges the surface of the photosensitive drum 4 with the residual toner by the charging roller 5 as shown in FIG. 5B. Specifically, as shown in FIG. 7, the control unit 23 applies a negative charging bias to the charging roller 5 at the time point t3. The absolute value of the charge bias is larger than the absolute value of the peeling roller bias. Then, the surface of the photosensitive drum 4 is negatively charged by the charging roller 5.
　３．６　露光工程（Ｓ６）
　次に、画像形成装置１は、図３に示すように、工程（Ｓ６）を実行する。画像形成装置１は、工程（Ｓ６）において、図６Ａに示すように、露光装置６により、現像ローラ８によってトナーが感光ドラム４に供給される前に、帯電ローラ５によって帯電された感光ドラム４の表面を露光する。これにより、感光ドラム４の表面に静電潜像が形成される。 3.6 Exposure step (S6)
Next, the image forming apparatus 1 executes the step (S6) as shown in FIG. In the step (S6), the image forming apparatus 1 is charged by the charging roller 5 before the toner is supplied to the photosensitive drum 4 by the developing roller 8 by the exposure apparatus 6, as shown in FIG. 6A. The surface of the is exposed. As a result, an electrostatic latent image is formed on the surface of the photosensitive drum 4.
　３．７　現像バイアスを印加する工程（Ｓ７）
　次に、画像形成装置１は、図３に示すように、工程（Ｓ７）を実行する。画像形成装置１は、工程（Ｓ７）において、現像バイアスを現像ローラ８に印加する。詳しくは、図７に示すように、制御部２３は、帯電バイアスを帯電ローラ５に印加した後、所定の第２時間Ｔ２が経過した後に、時点ｔ４において、現像バイアスを現像ローラ８に印加する。第２時間Ｔ２は、感光ドラム４の表面のうちの帯電ローラ５と接触した部分が、現像ローラ８に到達するまでの時間である。 3.7 Step of applying development bias (S7)
Next, the image forming apparatus 1 executes the step (S7) as shown in FIG. The image forming apparatus 1 applies a development bias to the developing roller 8 in the step (S7). Specifically, as shown in FIG. 7, the control unit 23 applies the development bias to the developing roller 8 at the time point t4 after the predetermined second time T2 elapses after applying the charging bias to the charging roller 5. .. The second time T2 is the time until the portion of the surface of the photosensitive drum 4 in contact with the charging roller 5 reaches the developing roller 8.
　３．８　回収工程（Ｓ８）
　次に、画像形成装置１は、図３に示すように、工程（Ｓ８）を実行する。画像形成装置１は、図６Ｂに示すように、工程（Ｓ８）において、現像バイアスが印加された現像ローラ８により、残トナーを筐体７（図１参照）へ回収する。 3.8 Recovery step (S8)
Next, the image forming apparatus 1 executes the step (S8) as shown in FIG. As shown in FIG. 6B, the image forming apparatus 1 collects the residual toner to the housing 7 (see FIG. 1) by the developing roller 8 to which the developing bias is applied in the step (S8).
　なお、工程（Ｓ８）は、次の印刷における工程（Ｓ１）と同時に実行されてもよい。詳しくは、現像ローラ８は、感光ドラム４の表面のうちの静電潜像が形成された領域に筐体７内のトナーを供給する（Ｓ１）とともに、感光ドラム４の表面のうちの静電潜像が形成されていない領域に付着した残トナーを、筐体７へ回収する（Ｓ８）。なお、感光ドラム４の表面のうちの静電潜像が形成された領域に付いていたいた残トナーは、筐体７から供給されたトナーとともに、次の印刷に使用される。 The step (S8) may be executed at the same time as the step (S1) in the next printing. Specifically, the developing roller 8 supplies the toner in the housing 7 to the region on the surface of the photosensitive drum 4 where the electrostatic latent image is formed (S1), and at the same time, the electrostatic on the surface of the photosensitive drum 4. The residual toner adhering to the region where the latent image is not formed is collected in the housing 7 (S8). The residual toner attached to the region of the surface of the photosensitive drum 4 on which the electrostatic latent image is formed is used for the next printing together with the toner supplied from the housing 7.
　４．作用効果
　この現像方法によれば、図５Ａに示すように、感光ドラム４の表面に付いた残トナーを、剥がしローラ２１によって、感光ドラム４の表面から剥がす。 4. Action effect According to this developing method, as shown in FIG. 5A, the residual toner attached to the surface of the photosensitive drum 4 is peeled off from the surface of the photosensitive drum 4 by the peeling roller 21.
　これにより、感光ドラム４の表面のフィルミングを抑制できる。 Thereby, the filming of the surface of the photosensitive drum 4 can be suppressed.
　そして、感光ドラム４の表面から剥がした残トナーを、剥がしローラ２１によって帯電させることにより、感光ドラム４の表面に付けて、図６Ｂに示すように、現像ローラ８によって筐体７内に回収する。 Then, the residual toner peeled off from the surface of the photosensitive drum 4 is charged by the peeling roller 21 to be attached to the surface of the photosensitive drum 4, and is collected in the housing 7 by the developing roller 8 as shown in FIG. 6B. ..
　そのため、残トナーを回収するための容器を別途設ける必要がない。 Therefore, it is not necessary to separately provide a container for collecting the residual toner.
　総括すると、感光ドラム４の表面のフィルミングを抑制しつつ、現像ローラ８を用いて、残トナーを回収できる。 In summary, the residual toner can be recovered by using the developing roller 8 while suppressing the filming of the surface of the photosensitive drum 4.
　５．変形例
　図８に示すように、ドラムカートリッジ１１Ａは、クリーニングローラ３０を備えてもよい。クリーニングローラ３０は、帯電クリーニングローラ２２と接触する。クリーニングローラ３０は、第１方向に延びる軸について回転可能である。クリーニングローラ３０は、軸に沿って第１方向に延びる。クリーニングローラ３０は、周面に、螺旋形状の溝を有する。クリーニングローラ３０は、帯電クリーニングローラ２２に付いた紙粉を回収する。 5. Modification Example As shown in FIG. 8, the drum cartridge 11A may include a cleaning roller 30. The cleaning roller 30 comes into contact with the charged cleaning roller 22. The cleaning roller 30 is rotatable about an axis extending in the first direction. The cleaning roller 30 extends in the first direction along the axis. The cleaning roller 30 has a spiral groove on the peripheral surface. The cleaning roller 30 collects the paper dust attached to the charged cleaning roller 22.
　この場合、帯電クリーニングローラ２２の周速と帯電ローラ５の周速とは異なる。帯電クリーニングローラ２２には、帯電バイアスよりも絶対値が小さい負の第１クリーニングバイアスが印加される。また、クリーニングローラ３０には、第１クリーニングバイアスよりも絶対値が小さい負の第２クリーニングバイアスが印加される。クリーニングローラ３０は、クリーナー部材の一例である。なお、クリーナー部材は、クリーニングブレードであってもよい。 In this case, the peripheral speed of the charged cleaning roller 22 and the peripheral speed of the charged roller 5 are different. A negative first cleaning bias having an absolute value smaller than the charging bias is applied to the charging cleaning roller 22. Further, a negative second cleaning bias having an absolute value smaller than that of the first cleaning bias is applied to the cleaning roller 30. The cleaning roller 30 is an example of a cleaner member. The cleaner member may be a cleaning blade.
　また、画像形成装置１は、現像カートリッジ１１Ｂに装着可能なトナーカートリッジを備えてもよい。詳しくは、現像カートリッジ１１Ｂは、上記した筐体７と現像ローラ８とを備える。トナーカートリッジは、現像カートリッジ１１Ｂの筐体７に装着可能である。
トナーカートリッジは、筐体７に供給されるトナーを収容する。 Further, the image forming apparatus 1 may include a toner cartridge that can be attached to the developing cartridge 11B. Specifically, the developing cartridge 11B includes the housing 7 and the developing roller 8 described above. The toner cartridge can be mounted on the housing 7 of the developing cartridge 11B.
The toner cartridge accommodates the toner supplied to the housing 7.
　また、ドラムカートリッジ１１Ａは、感光ドラム４と、帯電ローラ５と、現像器と、転写ローラ９とを備えてもよい。現像器は、筐体７と、現像ローラ８とを備える。この場合、画像形成装置１は、ドラムカートリッジ１１Ａに装着可能なトナーカートリッジを備えてもよい。 Further, the drum cartridge 11A may include a photosensitive drum 4, a charging roller 5, a developing device, and a transfer roller 9. The developing device includes a housing 7 and a developing roller 8. In this case, the image forming apparatus 1 may include a toner cartridge that can be attached to the drum cartridge 11A.
　また、画像形成装置１は、ドラムユニットと現像器とを一体として備えるカートリッジを備えてもよい。ドラムユニットは、感光ドラム４と、帯電ローラ５と、転写ローラ９とを備える。現像器は、筐体７と、現像ローラ８とを備える。 Further, the image forming apparatus 1 may include a cartridge including a drum unit and a developing device as a unit. The drum unit includes a photosensitive drum 4, a charging roller 5, and a transfer roller 9. The developing device includes a housing 7 and a developing roller 8.
　１　　　　画像形成装置
　４　　　　感光ドラム
　５　　　　帯電ローラ
　６　　　　露光装置
　７　　　　筐体
　８　　　　現像ローラ
　９　　　　転写ローラ
　１１Ａ　　ドラムカートリッジ
　１１Ｂ　　現像カートリッジ
　２１　　　剥がしローラ
　２２　　　帯電クリーニングローラ
　２３　　　制御部
　３０　　　クリーニングローラ
　Ｓ　　　　シート
　Ｓ１　　　現像工程
　Ｓ２　　　転写工程
　Ｓ３　　　剥がしローラバイアスを印加する工程
　Ｓ４　　　剥がし工程
　Ｓ５　　　帯電工程
　Ｓ６　　　露光工程
　Ｓ７　　　現像バイアスを印加する工程
　Ｓ８　　　回収工程
　Ｔ　　　　残トナー
　Ｔ１　　　第１時間
　Ｔ２　　　第２時間 1 Image forming device 4 Photosensitive drum 5 Charging roller 6 Exposure device 7 Housing 8 Development roller 9 Transfer roller 11A Drum cartridge 11B Development cartridge 21 Peeling roller 22 Charging cleaning roller 23 Control unit 30 Cleaning roller S sheet S1 Development process S2 Transfer process S3 Peeling Roller Bias Applying Step S4 Peeling Step S5 Charging Step S6 Exposure Step S7 Developing Bias Applying Step S8 Recovery Step T Residual Toner T1 1st Hour T2 2nd Hour

Claims (13)

  1. 　負の現像バイアスが印加された現像ローラにより、非磁性一成分系の負帯電性トナーを収容可能な筐体から、前記トナーを感光ドラムへ供給する工程と、
    　正の転写バイアスが印加された転写ローラにより、前記感光ドラムの表面の前記トナーを、シートへ転写する工程と、
    　前記感光ドラムの表面に付いた残トナーを、剥がしローラと前記感光ドラムとの周速差によって、前記感光ドラムの表面から剥がし、前記現像バイアスよりも絶対値が大きい負の剥がしローラバイアスであって前記剥がしローラに印加された剥がしローラバイアスにより、剥がした前記残トナーを負に帯電させて、帯電された前記残トナーを前記感光ドラムの表面に付ける工程と、
    　前記剥がしローラバイアスよりも絶対値が大きい負の帯電バイアスが印加された帯電ローラにより、前記残トナーが付いた前記感光ドラムの表面を負に帯電させる工程と、
    　前記現像バイアスが印加された前記現像ローラにより、前記残トナーを前記筐体へ回収する工程と
    を含むことを特徴とする、現像方法。     A process of supplying the toner to the photosensitive drum from a housing capable of accommodating a non-magnetic one-component negatively charged toner by a developing roller to which a negative development bias is applied.
    A step of transferring the toner on the surface of the photosensitive drum to a sheet by a transfer roller to which a positive transfer bias is applied, and
    The residual toner attached to the surface of the photosensitive drum is peeled off from the surface of the photosensitive drum by the difference in peripheral speed between the peeling roller and the photosensitive drum, and the negative peeling roller bias having an absolute value larger than the development bias. A step of negatively charging the peeled residual toner by the peeling roller bias applied to the peeling roller and applying the charged residual toner to the surface of the photosensitive drum.
    A step of negatively charging the surface of the photosensitive drum with the residual toner by a charging roller to which a negative charging bias having an absolute value larger than that of the peeling roller bias is applied.
    A developing method comprising a step of collecting the residual toner in the housing by the developing roller to which the development bias is applied.
  2. 　前記剥がしローラにより帯電された前記残トナーは、前記感光ドラムの表面との電位差により、前記感光ドラムの表面に付くことを特徴とする、請求項１に記載の現像方法。 The developing method according to claim 1, wherein the residual toner charged by the peeling roller adheres to the surface of the photosensitive drum due to a potential difference from the surface of the photosensitive drum.
  3. 　前記現像バイアスを前記現像ローラに印加した後、所定の第１時間が経過した後に、前記正の転写バイアスを前記転写ローラに印加するとともに、前記剥がしローラバイアスを前記剥がしローラに印加する工程と、
    　前記帯電バイアスを前記帯電ローラに印加した後、所定の第２時間が経過した後に、前記現像バイアスを前記現像ローラに印加する工程と
    をさらに含むことを特徴とする、請求項１または請求項２に記載の現像方法。     A step of applying the positive transfer bias to the transfer roller and applying the peeling roller bias to the peeling roller after a predetermined first time has elapsed after applying the development bias to the developing roller.
    Claim 1 or claim 2 further includes a step of applying the development bias to the developing roller after a predetermined second time has elapsed after applying the charging bias to the charging roller. The developing method described in.
  4. 　前記現像ローラによって前記トナーが前記感光ドラムに供給される前に、前記帯電ローラによって帯電された前記感光ドラムの表面を露光することにより、前記感光ドラムの表面に静電潜像を形成する工程を、さらに含むことを特徴とする、請求項１から請求項３のいずれか一項に記載の現像方法。 A step of forming an electrostatic latent image on the surface of the photosensitive drum by exposing the surface of the photosensitive drum charged by the charging roller before the toner is supplied to the photosensitive drum by the developing roller. The developing method according to any one of claims 1 to 3, further comprising.
  5. 　非磁性一成分系の負帯電性トナーを収容可能な筐体と、
    　前記トナーで作られたトナー像が表面に形成される感光ドラムと、
    　負の現像バイアスが印加され、前記筐体内の前記トナーを前記感光ドラムの表面に供給可能な現像ローラと、
    　正の転写バイアスが印加され、前記感光ドラムの表面からシートに前記トナー像を転写可能な転写ローラと、
    　前記現像バイアスよりも絶対値が大きい負の剥がしローラバイアスが印加される剥がしローラであって、前記シートに転写されずに前記感光ドラムの表面に残った残トナーを、前記剥がしローラと前記感光ドラムとの周速差によって、前記感光ドラムの表面から剥がすことが可能な剥がしローラであり、剥がした残トナーを前記剥がしローラバイアスにより負に帯電させて、帯電された前記残トナーを前記感光ドラムの表面に付ける剥がしローラと、
    　前記剥がしローラバイアスよりも絶対値が大きい負の帯電バイアスが印加される帯電ローラであって、前記残トナーが付いた前記感光ドラムの表面を負に帯電させる帯電ローラと
    を備え、
    　前記現像バイアスが印加される前記現像ローラにより、前記残トナーを前記筐体に回収することを特徴とする、画像形成装置。     A housing that can accommodate non-magnetic one-component negatively charged toner,
    A photosensitive drum on which a toner image made of the toner is formed on the surface,
    A developing roller to which a negative development bias is applied and capable of supplying the toner in the housing to the surface of the photosensitive drum,
    A transfer roller capable of transferring the toner image from the surface of the photosensitive drum to the sheet by applying a positive transfer bias.
    A peeling roller to which a negative peeling roller bias having an absolute value larger than the development bias is applied, and the residual toner remaining on the surface of the photosensitive drum without being transferred to the sheet is removed from the peeling roller and the photosensitive drum. It is a peeling roller that can be peeled off from the surface of the photosensitive drum due to the difference in peripheral speed between the two, and the peeled residual toner is negatively charged by the peeling roller bias, and the charged residual toner is charged to the photosensitive drum. A peeling roller attached to the surface and
    It is a charging roller to which a negative charging bias having an absolute value larger than the peeling roller bias is applied, and includes a charging roller that negatively charges the surface of the photosensitive drum with the residual toner.
    An image forming apparatus, characterized in that the residual toner is collected in the housing by the developing roller to which the development bias is applied.
  6. 　前記画像形成装置は、さらに、制御部を備え、
    　前記制御部は、
    　　前記現像バイアスを前記現像ローラに印加した後、所定の第１時間が経過した後に、前記正の転写バイアスを前記転写ローラに印加するとともに、前記剥がしローラバイアスを前記剥がしローラに印加し、
    　　前記帯電バイアスを前記帯電ローラに印加した後、所定の第１時間が経過した後に、前記現像バイアスを前記現像ローラに印加することを特徴とする、請求項５に記載の画像形成装置。     The image forming apparatus further includes a control unit.
    The control unit
    After a predetermined first time elapses after applying the development bias to the developing roller, the positive transfer bias is applied to the transfer roller, and the peeling roller bias is applied to the peeling roller.
    The image forming apparatus according to claim 5, wherein the development bias is applied to the development roller after a predetermined first time has elapsed after applying the charge bias to the charge roller.
  7. 　前記現像ローラによって前記トナーが前記感光ドラムに供給される前に、前記帯電ローラによって帯電された前記感光ドラムの表面を露光することにより、前記感光ドラムの表面に静電潜像を形成する露光装置を、さらに備えることを特徴とする、請求項５または請求項６に記載の画像形成装置。 An exposure apparatus that forms an electrostatic latent image on the surface of the photosensitive drum by exposing the surface of the photosensitive drum charged by the charging roller before the toner is supplied to the photosensitive drum by the developing roller. The image forming apparatus according to claim 5 or 6, further comprising.
  8. 　前記画像形成装置は、さらに、前記帯電ローラをクリーニングする帯電クリーニングローラを備えることを特徴とする、請求項５から請求項７のいずれか一項に記載の画像形成装置。 The image forming apparatus according to any one of claims 5 to 7, wherein the image forming apparatus further includes a charged cleaning roller for cleaning the charging roller.
  9. 　前記帯電クリーニングローラは、前記帯電ローラと従動し、
    　前記帯電クリーニングローラには、前記帯電バイアス以下の絶対値を有する負のクリーニングバイアスが印加されることを特徴とする、請求項８に記載の画像形成装置。     The charged cleaning roller is driven by the charged roller,
    The image forming apparatus according to claim 8, wherein a negative cleaning bias having an absolute value equal to or lower than the charging bias is applied to the charging cleaning roller.
  10. 　前記画像形成装置は、さらに、前記帯電クリーニングローラと接触し、前記帯電クリーニングローラに付いた紙粉を回収するクリーナー部材を備えることを特徴とする、請求項８に記載の画像形成装置。 The image forming apparatus according to claim 8, further comprising a cleaner member that comes into contact with the charged cleaning roller and collects paper dust attached to the charged cleaning roller.
  11. 　前記帯電クリーニングローラの周速と前記帯電ローラの周速とは異なり、
    　前記帯電クリーニングローラには、前記帯電バイアスよりも絶対値が小さい負の第１クリーニングバイアスが印加され、
    　前記クリーナー部材には、前記第１クリーニングバイアスよりも絶対値が小さい負の第２クリーニングバイアスが印加されることを特徴とする、請求項１０に記載の画像形成装置。     The peripheral speed of the charged cleaning roller is different from the peripheral speed of the charged roller.
    A negative first cleaning bias having an absolute value smaller than that of the charging bias is applied to the charging cleaning roller.
    The image forming apparatus according to claim 10, wherein a negative second cleaning bias having an absolute value smaller than that of the first cleaning bias is applied to the cleaner member.
  12. 　前記画像形成装置は、
    　　前記感光ドラムと、前記帯電ローラと、前記剥がしローラとを備えるドラムカートリッジと、
    　　前記ドラムカートリッジに装着可能な現像カートリッジであって、前記筐体と前記現像ローラとを備える現像カートリッジとを備えることを特徴とする、請求項５から請求項１１のいずれか一項に記載の画像形成装置。     The image forming apparatus
    A drum cartridge including the photosensitive drum, the charging roller, and the peeling roller.
    The image according to any one of claims 5 to 11, wherein a developing cartridge that can be attached to the drum cartridge includes a developing cartridge including the housing and the developing roller. Forming device.
  13. 　前記ドラムカートリッジは、さらに、前記転写ローラを備えることを特徴とする、請求項１２に記載の画像形成装置。 The image forming apparatus according to claim 12, wherein the drum cartridge further includes the transfer roller.
PCT/JP2020/013609 2019-03-27 2020-03-26 Development method and image forming apparatus WO2020196732A1 (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09211978A (en) * 1996-01-29 1997-08-15 Canon Inc Image forming device
JPH09292757A (en) * 1996-02-29 1997-11-11 Oki Data:Kk Image forming method and device therefor
JP3113803B2 (en) * 1994-11-08 2000-12-04 東芝テック株式会社 Image forming device
JP2008129339A (en) * 2006-11-21 2008-06-05 Canon Inc Image forming apparatus
JP2008257227A (en) * 2007-03-15 2008-10-23 Ricoh Co Ltd Image forming method and process cartridge
JP2009069827A (en) * 2007-09-14 2009-04-02 Toshiba Corp Developer and method for manufacturing the same, and image forming apparatus
US20090129795A1 (en) * 2007-11-15 2009-05-21 Kabushiki Kaisha Toshiba Color image forming method and color image forming apparatus
JP2009175698A (en) * 2007-12-28 2009-08-06 Konica Minolta Business Technologies Inc Cleaning roller for cleaning charging roller and image forming apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3113803B2 (en) * 1994-11-08 2000-12-04 東芝テック株式会社 Image forming device
JPH09211978A (en) * 1996-01-29 1997-08-15 Canon Inc Image forming device
JPH09292757A (en) * 1996-02-29 1997-11-11 Oki Data:Kk Image forming method and device therefor
JP2008129339A (en) * 2006-11-21 2008-06-05 Canon Inc Image forming apparatus
JP2008257227A (en) * 2007-03-15 2008-10-23 Ricoh Co Ltd Image forming method and process cartridge
JP2009069827A (en) * 2007-09-14 2009-04-02 Toshiba Corp Developer and method for manufacturing the same, and image forming apparatus
US20090129795A1 (en) * 2007-11-15 2009-05-21 Kabushiki Kaisha Toshiba Color image forming method and color image forming apparatus
JP2009175698A (en) * 2007-12-28 2009-08-06 Konica Minolta Business Technologies Inc Cleaning roller for cleaning charging roller and image forming apparatus

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