WO2018139219A1 - 電子写真方式の画像形成装置、及び画像形成装置に用いられる除電部材 - Google Patents
電子写真方式の画像形成装置、及び画像形成装置に用いられる除電部材 Download PDFInfo
- Publication number
- WO2018139219A1 WO2018139219A1 PCT/JP2018/000636 JP2018000636W WO2018139219A1 WO 2018139219 A1 WO2018139219 A1 WO 2018139219A1 JP 2018000636 W JP2018000636 W JP 2018000636W WO 2018139219 A1 WO2018139219 A1 WO 2018139219A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- image forming
- static elimination
- forming apparatus
- speed
- value
- Prior art date
Links
Images
Classifications
-
- 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
- G03G21/06—Eliminating residual charges from a reusable imaging member
-
- 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
- G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
- G03G15/5004—Power supply control, e.g. power-saving mode, automatic power turn-off
-
- 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
- G03G15/0208—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus
- G03G15/0216—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus by bringing a charging member into contact with the member to be charged, e.g. roller, brush chargers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
- G03G2221/0005—Cleaning of residual toner
Definitions
- the present invention relates to an electrophotographic image forming apparatus and a charge eliminating member.
- an electrophotographic image forming apparatus After an electrostatic latent image is formed on a charged photoreceptor, the toner image on the photoreceptor developed with toner is transferred to a sheet, and the charge remaining on the photoreceptor is transferred. It is removed by the static eliminator.
- the static eliminator there is known a configuration in which a grounded static eliminator is brought into contact with a photoconductor to remove the charge on the photoconductor (for example, see Patent Document 1).
- An object of the present invention is to provide an image forming apparatus capable of improving the charge removal performance in consideration of contact resistance and a charge removal member used in the image forming apparatus.
- An image forming apparatus includes a photosensitive member and a static elimination member that is electrically grounded and is rotatably disposed in contact with the surface of the photosensitive member.
- the resistance component of the internal impedance is Necessary for lowering the pre-static potential of the photoconductor to a predetermined post-static potential during the static elimination time obtained by dividing the contact width of the photoconductor and the static eliminator by the linear velocity of the photoconductor.
- a resistance component of the contact impedance is calculated based on the ratio to the calculated resistance value. Is less than or equal to the value obtained by multiplying the value.
- an image forming apparatus capable of improving the charge removal performance in consideration of contact resistance and a charge removal member used in the image forming apparatus.
- FIG. 1 is a diagram illustrating a configuration of an image forming apparatus according to a first embodiment of the present invention.
- FIG. 3 is a diagram for explaining a main part of an image forming unit of the image forming apparatus according to the first embodiment of the present invention.
- FIG. 3 is a diagram illustrating an equivalent circuit for explaining electrical characteristics between the photosensitive member and the charge removal member of the image forming unit of the image forming apparatus according to the first embodiment of the present invention.
- 6 is a diagram illustrating an example of a result of a Cole-Cole plot of a charge removal member of the image forming apparatus according to the first embodiment of the present invention.
- FIG. 3 is a diagram illustrating an example of an experimental apparatus used to obtain a Cole-Cole plot result of a charge removal member of the image forming apparatus according to the first embodiment of the present invention.
- FIG. 3 is a diagram illustrating an example of an experimental apparatus used to obtain a Cole-Cole plot result of a charge removal member of the image forming apparatus according to the first embodiment of the present invention. It is a figure which shows an Example and a comparative example.
- FIG. 3 is a diagram illustrating a relationship between a ratio of a linear speed of a static eliminating member to a linear speed of a photosensitive member of the image forming apparatus according to the first embodiment of the present invention and a post-static potential.
- FIG. 1 is a block diagram illustrating a system configuration of an image forming apparatus according to a first embodiment of the present invention.
- 6 is a flowchart illustrating an example of a first speed change process executed by the image forming apparatus according to the first embodiment of the present invention.
- FIG. 3 is a diagram illustrating a relationship between a ratio of a linear speed of a static eliminating member to a linear speed of a photosensitive member of the image forming apparatus according to the first embodiment of the present invention and a post-static potential.
- FIG. 1 is a block diagram illustrating a system configuration of an image forming apparatus according to a first embodiment of the present invention.
- 6 is a flowchart illustrating an example of a first speed change process executed by the image forming apparatus according to the first embodiment of the present invention.
- FIG. 3 is a diagram illustrating a relationship between a ratio of a linear speed of a static eliminating member to a linear speed of a photosensitive member of the image forming apparatus according to the first embodiment of the
- 10 is a diagram for explaining a main part of an image forming unit of an image forming apparatus according to a second embodiment of the present invention. It is a block diagram which shows the system configuration
- an image forming apparatus 10 includes an electrophotographic monochrome that includes a control unit 1, an image forming unit 2, a paper feed unit 3, a paper discharge unit 4, and the like. It is a printer.
- Other examples of the image forming apparatus according to the present invention include a fax machine, a copier, and a multifunction machine.
- the image forming apparatus according to the present invention is not limited to the monochrome image forming apparatus 10 as described in the first embodiment, but is an electrophotographic image capable of color printing such as a tandem method including an image forming unit corresponding to each color.
- the image forming apparatus may be of a type.
- the control unit 1 includes a CPU, a RAM, a ROM, an EEPROM, and the like, and controls the image forming apparatus 10 by executing various processes by the CPU according to a control program stored in the ROM.
- the image forming unit 2 includes an electrophotographic image forming unit including a photosensitive drum 21, a charging device 22, an optical scanning device 23, a developing device 24, a transfer roller 25, a cleaning member 26, a charge removing member 27, a fixing device 28, and the like. It is.
- the photoconductor drum 21 is an example of a photoconductor, and for example, a photoconductor belt may be used as the photoconductor instead of the photoconductor drum 21.
- the image forming unit 2 is controlled by the control unit 1, whereby an image forming process for forming an image on a sheet such as paper supplied from the paper feed cassette 31 of the paper feed unit 3 ( Print processing) is executed, and the sheet after the image forming process is discharged to the paper discharge unit 4.
- an electrostatic latent image based on image data is formed on the surface of the photosensitive drum 21 charged by the charging device 22 by scanning the light beam with the light scanning device 23.
- the electrostatic latent image formed on the surface of the photosensitive drum 21 is developed with toner by the developing device 24 and then transferred to the sheet by the transfer roller 25.
- the toner transferred to the sheet is melted and fixed to the sheet by the fixing device 28.
- the toner remaining on the surface of the photosensitive drum 21 is cleaned by the cleaning member 26. Further, the electric charge remaining on the photosensitive drum 21 is removed by the charge removing member 27 disposed on the downstream side of the cleaning member 26.
- the photoreceptor drum 21 is an organic photoreceptor (OPC) having a single layer structure in which a photosensitive layer containing a charge generation material and a charge transport material is formed around an aluminum tube, for example.
- OPC organic photoreceptor
- the charge generation material is a perylene pigment, a phthalocyanine pigment, or the like
- the charge transport material is a hydrazone compound, a fluorenone compound, an arylamine compound, or the like.
- the photosensitive drum 21 is a positively charged single-layer organic photosensitive drum (PSLP: Positive-charged Single Layer Photoconductor) that is positively charged. It should be noted that the case where the photosensitive drum 21 is a multi-layered organic photosensitive member and a negatively charged organic photosensitive member are also conceivable as other embodiments.
- PSLP Positive-charged Single Layer Photoconductor
- the charging device 22 includes a charging roller 220 (an example of a charging member) that contacts the photosensitive drum 21.
- the charging roller 220 is applied with a positive DC voltage from the power source 221.
- a positive DC voltage is applied from the charging roller 220 to the photosensitive drum 21, and the photosensitive drum 21 is charged to a predetermined charging potential.
- the charging device 22 according to the present embodiment is not an AC superimposing type charging device that superimposes an AC voltage on a DC voltage, and is a non-contact type that charges the photosensitive drum 21 in a non-contact manner like scorotron charging. It is not a charging device.
- the charging device 22 may be an AC superposed charging device or a non-contact charging device.
- the static elimination member 27 is electrically grounded. Further, the static elimination member 27 is rotatably supported while being in contact with the surface of the photosensitive drum 21.
- the charge removal member 27 is a brush-like roller member formed of a conductive metal material or resin material.
- the static elimination member 27 has a cylindrical base portion 270 and brush bristles 271 whose one end is fixed to the base portion 270 and the other end contacts the surface of the photosensitive drum 21.
- the static elimination member 27 is not limited to a brush shape, and may be a cylindrical (roll-shaped) roller member formed of a conductive metal material or resin material.
- the resin material is, for example, rubber or sponge.
- the electrical characteristics such as the internal capacitance of the static elimination member 27 are related to the potential stability and the memory image in the photosensitive drum 21. May affect the presence or absence of. However, not only the internal capacitance of the charge removal member 27 but also the contact capacitance of the charge removal member 27 may affect the potential stability and the presence or absence of a memory image.
- electrical characteristics such as the internal resistance of the static elimination member 27 may affect the static elimination performance.
- the internal resistance of the static elimination member 27 not only the internal resistance of the static elimination member 27 but also the contact resistance of the static elimination member 27 may affect the static elimination performance.
- the photosensitive drum 21 has a high surface resistance value, no lateral flow of charges occurs on the surface of the photosensitive drum 21. Therefore, even if the internal resistance of the static elimination member 27 is small, if the contact resistance with the photosensitive drum 21 is large, the charge on the photosensitive drum 21 cannot be effectively removed.
- a contact-type charging device 22 that contacts the photosensitive drum 21 when used, compared to a charging device that charges in a non-contact manner such as scorotron charging, a VOC (Volatile Organic) is used. (Compounds) and the like are suppressed.
- the contact-type charging device 22 may be inferior in charging performance as compared with the non-contact-type charging device.
- the charging device 22 being a DC voltage application type charging device can also be a factor that hinders charging performance.
- the image forming apparatus 10 is configured so that the electrical characteristics of the static elimination member 27 satisfy the first specific condition set in advance, so that the contact capacitance is also taken into consideration.
- the electrical characteristics of the static elimination member 27 are configured so as to satisfy the second specific condition set in advance, the static elimination performance is improved in consideration of the contact resistance of the static elimination member 27. It is possible.
- a resistor 51 corresponding to the DC resistance value R ⁇ b> 1 of the photosensitive drum 21.
- a capacitor 52 corresponding to the electrostatic capacitance C1 of the photosensitive drum 21 and a resistor 53 corresponding to the DC resistance value R2 of the static elimination member 27 are connected in parallel.
- the internal impedance Z1 and the contact impedance Z2 of the static elimination member 27 with respect to the preset frequency range such as 0.05 Hz to 100 kHz, for example, by the AC impedance method.
- the internal resistance component Ra and the internal capacitance component Ca in the internal impedance Z1 and the contact resistance component Rb and the contact capacitance component Cb in the contact impedance Z2 can be calculated.
- the plot corresponding to each of the internal impedance Z1 and the contact impedance Z2 draws a semicircle, but may be an arc shape such as a semi-elliptical shape. .
- the resistance between the cored bar of the photosensitive drum 21 and the photosensitive layer is negligible.
- the DC resistance value R1 of the photosensitive drum 21 is very large with respect to the DC resistance value R2 of the static elimination member 27. Therefore, the combined resistance R3 of the photosensitive drum 21 and the charge removal member 27 can be considered to be the same as the DC resistance value R2 of the charge removal member 27.
- the static elimination time during which each region of the photosensitive drum 21 is in contact with the static elimination member 27 is t, and the post-static potential is predetermined as a target value of the surface potential of the photosensitive drum 21 after the static elimination time t has elapsed.
- V1 a potential before static elimination of the photosensitive drum 21 at the start of static elimination by the static elimination member 27 is V0, and a capacitance of the photosensitive drum 21 is C.
- the DC resistance value R2 of the theoretical static elimination member 27 that can neutralize the surface potential of the photosensitive drum 21 from the pre-neutralization potential V0 to the post-neutralization potential V1 in the static elimination time t (hereinafter referred to as “calculated resistance”).
- the contact impedance of the charge removal member 27 with the photosensitive drum 21 also affects the charge removal performance of the charge removal member 27. Therefore, in the image forming apparatus 10, the charge removal member 27 is configured so that the conditions (the second specific condition) of the following formula (2) and the following formula (3) are satisfied.
- the internal resistance component Ra of the static elimination member 27 is equal to the calculated resistance value R 21 of the static elimination member 27 and the static elimination member 27 with respect to the linear velocity of the photosensitive drum 21. Or less than a value obtained by multiplying the first specific value calculated based on the linear velocity ratio Sr.
- the contact resistance component Rb of the charge removal member 27 is calculated based on the ratio Sr to the calculated resistance value R21 of the charge removal member 27. It is below the value multiplied by the value.
- the electrical characteristics of the static elimination member 27 are determined in consideration of not only the DC resistance value R 2 of the static elimination member 27 but also the internal resistance component Ra and the contact resistance component Rb. It is possible to improve the static elimination performance by the member 27.
- the DC resistance value R2 of the actual static elimination member 27 may be a value equal to or less than the calculated resistance value R21 or greater than the calculated resistance value R21.
- the internal resistance component Ra and the contact resistance component Rb of the static elimination member 27 are calculated resistance values R21 that can be neutralized to the potential V1 after static elimination in the static elimination time t and the line of the static elimination member 27 with respect to the linear velocity of the photosensitive drum 21.
- the static elimination performance by the static elimination member 27 improves. If the same effect occurs, the first specific value and the second specific value are not limited to the above-described values.
- the brush bristles 271 of the static elimination member 27 have a core portion 271A and a surface layer portion 271B.
- FIG. 9 is a cross-sectional view of one brush hair 271.
- the core portion 271A is made of resin.
- the surface layer portion 271B is made of carbon and covers the surface of the core portion 271A.
- the surface layer portion 271B is formed together with the core portion 271A when the brush bristles 271 are manufactured.
- the surface layer portion 271B may be formed by spraying carbon onto the surface of the core portion 271A after the core portion 271A is formed.
- the surface layer portion 271B may include components other than carbon as long as the static elimination member 27 satisfies the above formulas (2) and (3).
- the core portion 271A may contain carbon. Further, the brush bristles 271 may be formed of only a resin layer containing carbon.
- the static elimination member 27 rotates in response to a rotational driving force supplied from a first driving unit 272 (see FIG. 10) such as a motor.
- a first driving unit 272 such as a motor.
- the static elimination member 27 rotates at a higher linear speed than the photosensitive drum 21.
- the static elimination member 27 may rotate at the same linear velocity as the photosensitive drum 21 or at a slower linear velocity than the photosensitive drum 21.
- the static elimination member 27 may be rotated by following the photosensitive drum 21 at a speed obtained by multiplying a linear ratio of the photosensitive drum 21 by a predetermined ratio.
- the contact impedance of the charge removal member 27 with the photosensitive drum 21 also affects the potential stability of the photosensitive drum 21 and the presence or absence of the image memory.
- the charge removal member 27 is configured so as to satisfy the conditions of the following formula (4) and the following formula (5) (the first specific condition).
- the internal capacitance component Ca of the static elimination member 27 is 1.0E + 05 or less, which is an example of a predetermined fourth specific value.
- the capacitance ratio (Cb / Ca) which is a value obtained by dividing the contact capacitance component Cb of the charge removal member 27 by the internal capacitance component Ca. ) Is 0.4 or less, which is an example of a predetermined third specific value.
- the electrical characteristics of the charge removal member 27 are determined in consideration of the internal capacitance component Ca and the contact capacitance component Cb of the charge removal member 27. It is possible to improve the potential stability of the image and suppress the occurrence of image memory. Specifically, the internal capacitance component Ca is determined so that the charge accumulated in the charge removal member 27 is reduced, and the ratio of the contact capacitance component Cb to the internal capacitance component Ca is also small. Since electric charges are easily removed from 27, the potential stability is improved and the generation of image memory is suppressed. If the same effect occurs, the third specific value and the fourth specific value are not limited to the values described above.
- FIG. 5 and 6 are diagrams showing an experimental apparatus 90 for measuring the internal resistance component Ra, the contact resistance component Rb, the internal capacitance component Ca, and the contact capacitance component Cb of the static elimination member 27.
- the experimental apparatus 90 includes two stainless steel SUS rollers 91 and SUS rollers 92 each having a diameter of 18 mm and arranged at an interval of 4 mm in the horizontal direction.
- An aluminum film electrode 93 (horizontal length 150 mm) is suspended between the SUS roller 91 and the SUS roller 92.
- the static elimination members 27 according to Comparative Examples 1 to 15 and Examples 1 to 5, which are test objects, are arranged so as to be in contact with the upper surface of the film electrode 93.
- the experimental apparatus 90 includes a SUS roller 95 having a diameter of 30 mm arranged above the static elimination member 27.
- a load is applied to the SUS roller 95 downward by a 1 kg weight 96, and the load is applied to the charge removal member 27 via the SUS roller 95.
- the static elimination member 27 and the SUS rollers 91, 92, and 95 are tested in a state where they are not rotated.
- the two SUS rollers 91 and 92 are connected to one electrode of the impedance measuring device 97 (LCR high tester 3522 manufactured by Hioki Electric Co., Ltd.), and the base portion 270 of the static elimination member 27 is the other of the impedance measuring device 97. In this state, impedance measurement by the impedance measuring device 97 is performed.
- FIG. 7 the printing process is executed by the image forming apparatus 10 equipped with the neutralization member 27 of each example shown in FIG. 7, and the neutralization performance, potential stability, and image stability of the photosensitive drum 21 by the neutralization member 27 are illustrated.
- the evaluation result of evaluating the presence or absence of memory is shown.
- the surface potential of the photosensitive drum 21 after being charged by the charging device 22 was measured, and as a result, before the start of the continuous printing. It was evaluated whether or not the initial surface potential after being charged by the charging device 22 decreased by 10% or more.
- “success” is shown as the evaluation result of the potential stability when the initial surface potential is not lowered by 10% or more
- “failure” is shown when the initial surface potential is lowered by 10% or more. Note that a value of 10% was adopted here because a problem such as fogging may occur when the initial surface potential drops by 10% or more.
- a black patch having a predetermined shape is formed at the leading edge of the printing paper by the printing process in the image forming apparatus 10, and a half image (gray image) is printed in the other areas thereafter.
- the presence or absence of image memory was visually evaluated. Specifically, it is determined that the image memory has been generated when the shape of the black patch appears in the half image area.
- “success” is shown as the evaluation result when there is no image memory
- “failure” when the image memory is generated is shown as an evaluation result of the presence or absence of the image memory.
- the image forming apparatus 10 used in the experiment is a modified machine of the printer “FS-1320DN” manufactured by Kyocera Document Solutions Inc.
- the potential V0 before neutralization of the photosensitive drum 21 is 500 [V]
- the surface speed (linear velocity) S of the photosensitive drum 21 is 0.15 [m / s]
- the contact width L is 0. 0.005 [m].
- the dielectric constant ⁇ 0 of vacuum is 8.9E-12 [F / m]
- the relative dielectric constant ⁇ r of the photosensitive drum 21 is 3.5
- the film thickness d of the photosensitive drum 21 is 3.5E-05 [m]. It is.
- the electrostatic capacitance value C of the photosensitive drum 21 is 8.85E-07 [F] from “ ⁇ 0 ⁇ ⁇ r / d”.
- the post-static potential V1 which is a desired potential after the static elimination of the photosensitive drum 21 by the static eliminating member 27, is set to 100V.
- the calculated resistance value R21 of the static elimination member 27 is calculated as 2.34E + 04 [ ⁇ ] by the above equation (1).
- the linear velocity of the static elimination member 27 was set to 0.24 [m / s], which is 1.6 times the linear velocity S of the photosensitive drum 21. Therefore, in the comparative example 14, when the internal resistance component Ra of the static elimination member 27 is equal to or less than 1.502E + 05 [ ⁇ ] which is 6.42 times the calculated resistance value R21, the above expression (2) is satisfied. Further, when the contact resistance component Rb of the charge removal member 27 is equal to or less than 6.01E + 04 [ ⁇ ] which is 2.57 times the calculated resistance value R21, the above expression (3) is satisfied.
- the linear velocity of the static eliminating member 27 was set to 0.165 [m / s], which is 1.1 times the linear velocity S of the photosensitive drum 21. Therefore, in the comparative example 15, when the internal resistance component Ra of the static elimination member 27 is equal to or less than 8.35E + 04 [ ⁇ ] which is 3.57 times the calculated resistance value R21, the above expression (2) is satisfied. Further, when the contact resistance component Rb of the static elimination member 27 is equal to or less than 3.35E + 04 [ ⁇ ] which is 1.43 times the calculated resistance value R21, the above expression (3) is satisfied.
- Example 4 the linear velocity of the static eliminating member 27 was set to 0.24 [m / s], which is 1.6 times the linear velocity S of the photosensitive drum 21. Therefore, in Example 4, when the internal resistance component Ra of the static elimination member 27 is equal to or less than 1.502E + 05 [ ⁇ ], which is 6.42 times the calculated resistance value R21, the above expression (2) is satisfied. Further, when the contact resistance component Rb of the charge removal member 27 is equal to or less than 6.01E + 04 [ ⁇ ] which is 2.57 times the calculated resistance value R21, the above expression (3) is satisfied.
- Example 5 the linear velocity of the static eliminating member 27 was set to 0.255 [m / s], which is 1.7 times the linear velocity S of the photosensitive drum 21. Therefore, in Example 5, when the internal resistance component Ra of the charge removal member 27 is 1.64E + 05 [ ⁇ ] or less, which is 6.99 times the calculated resistance value R21, the above expression (2) is satisfied. Further, when the contact resistance component Rb of the static elimination member 27 is equal to or less than 6.55E + 04 [ ⁇ ] which is 2.80 times the calculated resistance value R21, the above expression (3) is satisfied.
- the static elimination member 27 which is the raw yarn which the bristle 271 performed the cleavage process to the conductive acrylic fiber of SA7 by Toray Industries, Inc. was used.
- the yarn resistance is 1.00E + 07 [ ⁇ ]
- the brush fineness is 30 [ ⁇ m] and high (fiber is thick)
- the brush density is 100 [kF / inch 2 ].
- Comparative Examples 1 to 9 are all dispersed systems in which the carbon state of the fibers is dispersed throughout the yarn. That is, in the static elimination member 27 according to Comparative Examples 1 to 9, the brush bristles 271 are formed only of a resin layer containing carbon.
- Comparative Example 2 As in Comparative Example 1, the neutralizing member 27, which is a raw yarn obtained by subjecting the brush bristles 271 to cleavage of conductive acrylic fiber SA7 manufactured by Toray Industries, Inc., was used.
- the yarn resistance is 1.00E + 06 [ ⁇ ]
- the brush fineness is 7 [ ⁇ m] and low (fiber is thin)
- the brush density is 500 [kF / inch 2 ]. And high density.
- the static elimination member 27 whose brush bristles 271 are the raw yarn of the conductive nylon of UUN made by Unitika Ltd. was used.
- the yarn resistance is 1.00E + 06 [ ⁇ ]
- the brush fineness is 7 [ ⁇ m] and low (fiber is thin)
- the brush density is 500 [kF / inch 2 ].
- high density the static elimination members 27 according to Comparative Examples 3 to 13 and Examples 1 to 3 have a circular fiber cross-sectional shape.
- the static elimination member 27 in which the bristle 271 was a raw yarn of conductive nylon of UUN manufactured by Unitika Ltd. was used.
- the yarn resistances are 1.00E + 05 [ ⁇ ], 1.04E + 05 [ ⁇ ], and 1.00E + 05 [ ⁇ ], respectively.
- the finenesses are 7 [ ⁇ m], 6 [ ⁇ m], and 6 [ ⁇ m], respectively.
- the densities are 500 [kF / inch 2 ], 550 [kF / inch 2 ], and 500 [kF / inch 2 ], respectively.
- Example 1 the static elimination member 27 whose brush bristles 271 are raw yarns of GBN fibers manufactured by KB Seiren Co., Ltd. were used.
- the yarn resistance is 1.00E + 04 [ ⁇ ]
- the brush fineness is 7 [ ⁇ m] and low (fiber is thin)
- the brush density is 500 [kF / inch 2 ].
- the static elimination member 27 according to Examples 1 to 3 and Comparative Examples 10 to 13 has a two-layer structure in which carbon is present in the outer side of the fiber, not in the fully dispersed system, and the contact resistance component Rb is decreasing. That is, in the static elimination member 27 according to Examples 1 to 3 and Comparative Examples 10 to 13, the brush bristles 271 have a core portion 271A and a surface layer portion 271B.
- the brush bristles 271 used the neutralizing member 27 that is a raw yarn of GBN fiber manufactured by KB Seiren Co., Ltd., but differs in that the yarn resistance is two orders of magnitude higher.
- Comparative Examples 11 to 13 the static elimination member 27 in which the brush bristles 271 are yarns obtained by spraying carbon onto polyester raw yarns was used.
- carbon is sprayed on the polyester yarn so that the values of the internal resistance component Ra and the contact resistance component Rb are small. Note that the amount of carbon sprayed in Comparative Examples 11 to 13 is the same as in Example 3, and the fineness and density of the polyester yarn are different from those in Example 3.
- Example 2 the static elimination member 27 in which the bristle 271 is a polyester yarn is used.
- the yarn resistance is 5.80E + 03 [ ⁇ ]
- the brush fineness is 7 [ ⁇ m] and low (fiber is thin)
- the brush density is 300 [kF / inch 2 ].
- high density is Moreover, although the static elimination member 27 according to the second embodiment has a two-layer structure in which carbon is present outside the fiber as in the first embodiment, the carbon particles are directly sprayed on the outer side of the fiber. As a result, the same level of electrical characteristics as in Example 1 is realized with a lower brush density than in Example 1.
- Example 3 the static elimination member 27 in which the bristle 271 is a polyester yarn is used.
- the yarn resistance is 6.40E + 03 [ ⁇ ]
- the brush fineness is 7 [ ⁇ m] and low (fiber is thin)
- the brush density is 300 [kF / inch 2 ].
- high density the static elimination member 27 according to Example 3 has a two-layer structure in which carbon exists on the outside of the fiber as in Example 1, but is in a state in which carbon particles are directly sprayed on the outside of the fiber. Note that the amount of carbon sprayed in Example 3 is smaller than that in Example 2.
- Comparative Example 14 the same static eliminating member 27 as in Comparative Example 10 was used.
- Comparative Example 15 the same static eliminating member 27 as that in Comparative Example 13 was used.
- Example 4 the same static eliminating member 27 as that in Comparative Example 5 was used.
- Example 5 the same static eliminating member 27 as that in Comparative Example 6 was used.
- the internal resistance component Ra exceeds 7.02E + 04 [ ⁇ ], which is three times the calculated resistance value R21. The condition is not met.
- the internal resistance component Ra is 7.02E + 04 [ ⁇ ] or less, which is three times the calculated resistance value R21. Therefore, the condition of the above expression (2) is satisfied.
- the internal resistance component Ra is equal to or less than 1.502E + 05 [ ⁇ ], which is 6.42 times the calculated resistance value R21. Therefore, the condition of the above expression (2) is satisfied.
- Comparative Example 15 the internal resistance component Ra is equal to or less than 8.35E + 04 [ ⁇ ], which is 3.57 times the calculated resistance value R21. Therefore, the condition of the above expression (2) is satisfied. However, in Comparative Examples 1 to 6, Comparative Example 10, and Comparative Example 13, the contact resistance component Rb exceeds 2.81E + 04 [ ⁇ ], which is 1.2 times the calculated resistance value R21. The condition of the expression is not satisfied. In Comparative Examples 1 to 6, Comparative Example 10, and Comparative Example 13, the evaluation result of the static elimination performance was “failure”.
- Example 1 the condition of the above formula (2) that the internal resistance component Ra of the static elimination member 27 is 7.02E + 04 [ ⁇ ] or less, which is three times the calculated resistance value R21, is satisfied.
- the condition of the above formula (3) is satisfied that the contact resistance component Rb is equal to or less than 2.81E + 04 [ ⁇ ], which is 1.2 times the calculated resistance value R21.
- Example 4 the condition of the above formula (2) that the internal resistance component Ra of the static elimination member 27 is equal to or less than 1.502E + 05 [ ⁇ ], which is 6.42 times the calculated resistance value R21, is satisfied.
- the condition of the above expression (3) is satisfied that the contact resistance component Rb is 6.01E + 04 [ ⁇ ] or less which is 2.57 times the calculated resistance value R21.
- the condition of the above formula (2) that the internal resistance component Ra of the static elimination member 27 is 1.64E + 05 [ ⁇ ] or less, which is 6.99 times the calculated resistance value R21, is satisfied.
- the condition of the above expression (3) is satisfied that the contact resistance component Rb is 6.55E + 04 [ ⁇ ] or less, which is 2.80 times the calculated resistance value R21.
- the evaluation result of the static elimination performance was “success”.
- the evaluation result of the static elimination performance is “failure”, whereas in the example 4 in which the same static elimination member 27 is used, the evaluation result of the static elimination performance is improved to “success”. .
- the evaluation result of the static elimination performance is “failure”, whereas in Example 5 in which the same static elimination member 27 is used, the evaluation result of the static elimination performance is improved to “success”.
- Comparative Example 10 and Comparative Example 13 the evaluation result of the static elimination performance is “failure”, whereas in Comparative Example 14 and Comparative Example 15 in which the same static elimination member 27 is used, the evaluation result of the static elimination performance is It has improved to “success”.
- FIG. 8 shows the relationship between the linear velocity of the static elimination member 27 and the post-static potential V1 in the image forming apparatus 10 equipped with the static elimination member 27 according to Comparative Examples 5 to 6, Comparative Example 10, and Comparative Example 13.
- desired static elimination performance can be obtained by considering not only the DC resistance value R2 of the static elimination member 27 but also the internal impedance Z1 and the contact impedance Z2. . More specifically, the desired static elimination performance was obtained when the conditions of the above formulas (2) and (3) were satisfied.
- Comparative Examples 5 to 7, Comparative Examples 10 to 11, and Comparative Example 14 the capacitance ratio (Cb / Ca) is 0.4 or less, so the capacitance ratio (Cb / Ca) is 0 or more.
- the condition of the above formula (5) of 0.4 or less is satisfied.
- Comparative Examples 1 to 3 Comparative Examples 7 to 8, and Comparative Examples 10 to 15, the internal capacitance component Ca of the static elimination member 27 exceeds 1.0E + 5.0.
- the condition of the above formula (4) that is 1.0E + 5.0 or less is not satisfied.
- the potential stability and the presence or absence of the image memory were evaluated only for the evaluation results of the static elimination performance that were “successful”.
- Comparative Examples 7 to 9 Comparative Examples 11 to 12, and Comparative Examples 14 to 15 in which the evaluation result of the static elimination performance was “success”, the evaluation results of potential stability and presence / absence of image memory were “failure”. "Met.
- Examples 1 to 5 the condition of the above equation (4) that the internal capacitance component Ca of the static elimination member 27 is 1.0E + 5.0 or less is satisfied, and the capacitance ratio (Cb The condition of the above equation (5) that / Ca) is 0 or more and 0.4 or less is satisfied.
- the evaluation results of the potential stability and the presence / absence of image memory were “success”.
- the applied voltage applied to the charging roller 220 that charges the photosensitive drum 21 is changed.
- the static elimination member 27 is in contact with the photosensitive drum 21
- wear of the photosensitive drum 21 is promoted.
- the life of the photosensitive drum 21 may be shortened.
- a first speed change program for causing the CPU to execute a first speed change process (see a flowchart of FIG. 11) described later is stored in advance.
- the first speed change program is recorded on a computer-readable recording medium such as a CD, DVD, or flash memory, and is read from the recording medium and installed in a storage device such as the EEPROM of the control unit 1. It may be a thing.
- control part 1 contains the density
- the density detection unit 11 executes density detection processing for detecting the density of the patch image based on predetermined image data formed on the surface of the photosensitive drum 21.
- a density sensor 29 is provided on the downstream side in the rotation direction of the photosensitive drum 21 with respect to the developing device 24 and on the upstream side in the rotation direction with respect to the transfer roller 25.
- the density sensor 29 is an optical sensor having a light emitting unit and a light receiving unit. In the density sensor 29, the light emitted from the light emitting unit and reflected by the surface of the photosensitive drum 21 is received by the light receiving unit. Then, an electrical signal corresponding to the amount of received light is output from the light receiving unit.
- the density detection unit 11 controls the operation of each unit of the image forming unit 2 to form the patch image on the surface of the photosensitive drum 21 when a predetermined first timing arrives.
- the density detector 11 detects the density of the patch image using the density sensor 29.
- the first timing is when the image forming apparatus 10 is turned on, when returning from a sleep state in which some functions of the image forming apparatus 10 are stopped, and when the printing process is executed.
- the voltage changing unit 12 changes the applied voltage applied from the power source 221 to the charging roller 220.
- the voltage changing unit 12 changes the applied voltage based on the density of the patch image detected by the density detecting unit 11.
- the voltage changing unit 12 also changes the developing bias voltage applied to the developing roller provided in the developing device 24 together with the applied voltage.
- the initial setting value of the applied voltage is set to 500V.
- the voltage changing unit 12 changes the applied voltage from 500V to 800V when the density of the patch image detected by the density detecting unit 11 is lighter than a predetermined range.
- the voltage changing unit 12 changes the applied voltage from 500 V to 300 V when the density of the patch image exceeds the specific range.
- the image forming apparatus 10 may be provided with a temperature / humidity sensor for detecting the temperature and humidity in the apparatus.
- the voltage changing unit 12 may change the applied voltage based on the detection result of the temperature and humidity in the machine by the temperature and humidity sensor.
- the first speed changing unit 13A increases the difference between the linear speed of the photosensitive drum 21 and the linear speed of the charge eliminating member 27 as the applied voltage applied to the charging roller 220 is higher.
- the first speed changing unit 13A is an example of a speed changing unit in the present invention.
- the first speed changing unit 13A determines the linear velocity of the static elimination member 27 when the calculated resistance value after the change of the applied voltage by the voltage changing unit 12 calculated based on the above equation (1) is R22.
- the ratio Sr satisfies the following formula (6) and the following formula (7), and is changed to a first specific speed (an example of the specific speed of the present invention) that minimizes the difference from the linear speed of the photosensitive drum 21.
- the pre-static potential V0 in the above equation (1) is acquired by multiplying the applied voltage that is the same as or changed by the voltage changing unit 12 by a predetermined coefficient.
- the static elimination member 27 rotates at a higher linear speed than the photosensitive drum 21 as described above. Therefore, the first speed changing unit 13A increases the linear speed of the static elimination member 27 and increases the difference between the linear speed of the photosensitive drum 21 and the linear speed of the static elimination member 27.
- the first speed changing unit 13 ⁇ / b> A decreases the linear speed of the static elimination member 27 to reduce the linear speed of the photosensitive drum 21 and the static elimination member 27. The difference from the linear velocity may be increased.
- the internal resistance component Ra, the contact resistance component Rb, and the calculated resistance value R22 corresponding to each of the applied voltages that can be set in the image forming apparatus 10 are stored in advance in the ROM of the control unit 1. Yes.
- the first speed changing unit 13A uses the internal resistance component Ra, the contact resistance component Rb, and the calculated resistance value R22 stored in the ROM.
- the linear velocity of the static elimination member 27 that satisfies the above condition is calculated.
- the first speed changing unit 13A changes the linear speed of the charge removal member 27 based on the calculation result.
- the first speed changing unit 13A may change the linear speed of the static elimination member 27 to a speed whose difference from the first specific speed is equal to or less than a preset allowable value.
- 13 A of 1st speed change parts may change the linear speed of the static elimination member 27 into the speed with which ratio Sr satisfy
- first table data indicating the linear velocity of the charge removal member 27 corresponding to each of the applied voltages that can be set in the image forming apparatus 10 may be stored in the ROM of the control unit 1 in advance.
- the first speed changing unit 13A may change the linear velocity of the charge removal member 27 using the first table data.
- the first table data is created based on experimental data obtained by an experiment for investigating the relationship between the ratio Sr corresponding to each pre-static potential V0 and the post-static potential V1 using the image forming apparatus 10.
- FIG. 12 shows an example of experimental data obtained by the experiment.
- the first speed changing unit 13A may change the linear speed of the photosensitive drum 21 to increase the difference between the linear speed of the photosensitive drum 21 and the linear speed of the charge removal member 27.
- steps S11, S12,... represent the numbers of processing procedures (steps) executed by the control unit 1.
- step S11 the control unit 1 determines whether or not the first timing has arrived.
- control part 1 judges that the said 1st timing has come (Yes side of S11), it will transfer a process to step S12. If the first timing has not arrived (No side of S11), the control unit 1 waits for the arrival of the first timing in step S11.
- step S12 the control unit 1 executes the concentration detection process.
- the processing of step S11 and step S12 is executed by the concentration detection unit 11 of the control unit 1.
- control unit 1 controls the operation of each unit of the image forming unit 2 to form the patch image on the surface of the photosensitive drum 21. Then, the control unit 1 uses the density sensor 29 to detect the density of the patch image. In step S12, the control unit 1 may detect the temperature and humidity inside the image forming apparatus 10.
- step S13 the control unit 1 changes the applied voltage based on the density of the patch image detected in step S12.
- step S ⁇ b> 13 is executed by the voltage changing unit 12 of the control unit 1.
- the control unit 1 sets the applied voltage stored in the predetermined first storage area of the RAM. The data indicating the value is rewritten to change the applied voltage to 800V. In addition, when the density of the patch image exceeds the specific range, the control unit 1 rewrites the data in the first storage area and changes the applied voltage to 300V. In addition, when the density of the patch image is within the specific range, the control unit 1 rewrites the data in the first storage area and changes the applied voltage to 500V.
- step S ⁇ b> 14 the control unit 1 changes the linear velocity of the static elimination member 27 according to the applied voltage after the change in step S ⁇ b> 13.
- the process of step S14 is executed by the first speed changing unit 13A of the control unit 1.
- control unit 1 sets the linear velocity of the static elimination member 27 so that the ratio Sr satisfies the above formulas (6) and (7) and the difference from the linear velocity of the photosensitive drum 21 is minimized. Change to the first specific speed. For example, the control unit 1 rewrites data indicating the set value of the linear velocity of the static elimination member 27 stored in a predetermined second storage area of the RAM, and changes the linear velocity of the static elimination member 27.
- the difference between the linear velocity of the photosensitive drum 21 and the linear velocity of the charge removal member 27 increases as the applied voltage applied to the charging roller 220 increases. .
- the linear velocity of the static elimination member 27 is such that the ratio Sr satisfies the above formulas (6) and (7) and is different from the linear velocity of the photosensitive drum 21. Is changed to the first specific speed. As a result, the difference between the linear speed of the photosensitive drum 21 and the linear speed of the charge removal member 27 is minimized within a range in which the necessary charge removal performance can be secured. For this reason, it is possible to more effectively suppress wear of the photosensitive drum 21.
- the first speed changing unit 13A is configured to reduce the difference between the linear speed of the photosensitive drum 21 and the linear speed of the charge removal member 27 in accordance with a decrease in the surface potential of the photosensitive drum 21 due to deterioration over time. It can be considered as a modification of one embodiment. For example, a configuration in which the first speed changing unit 13A decreases the linear speed of the static elimination member 27 every time a predetermined period elapses can be considered. According to this configuration, it is possible to more effectively suppress wear of the photosensitive drum 21.
- the image forming apparatus 10 according to the second embodiment of the present invention will be described below with reference to FIGS.
- the configurations of the charge removal member 27 and the control unit 1 are different from those of the first embodiment.
- Other configurations are common to the first embodiment and the second embodiment.
- the neutralizing member 27 is the first direction D1 approaching the photosensitive drum 21 and the first direction D1 opposite to the first direction D1. It can move in two directions D2.
- the bearing that supports the rotation shaft of the charge removal member 27 is supported by the housing of the image forming apparatus 10 so as to be able to move in the first direction D1 and the second direction D2. Yes.
- control unit 1 includes a movement processing unit 14 instead of the first speed changing unit 13A.
- the ROM of the control unit 1 stores in advance a contact pressure changing program for causing the CPU to execute a contact pressure changing process (see a flowchart of FIG. 15) described later.
- the control part 1 functions as the density
- the concentration detection unit 11 and the voltage change unit 12 are not different from those in the first embodiment, and thus description thereof is omitted.
- the movement processing unit 14 decreases the separation distance between the photosensitive drum 21 and the charge removal member 27 as the applied voltage applied to the charging roller 220 is higher. That is, the movement processing unit 14 increases the contact pressure between the photosensitive drum 21 and the charge removal member 27 as the applied voltage applied to the charging roller 220 is higher. Thereby, the contact resistance component Rb between the photosensitive drum 21 and the charge removal member 27 is reduced.
- the movement processing unit 14 moves the static elimination member 27 in the first direction D ⁇ b> 1 to reduce the separation distance between the photosensitive drum 21 and the static elimination member 27. . Further, when the applied voltage decreases by the voltage changing unit 12, the movement processing unit 14 moves the static elimination member 27 in the second direction D ⁇ b> 2 and increases the separation distance between the photosensitive drum 21 and the static elimination member 27.
- a second drive unit 273 such as a motor that moves the static elimination member 27 is provided.
- the second table data indicating the position within the movable range of the static elimination member 27 corresponding to each of the applied voltages that can be set in the image forming apparatus 10 is stored in the ROM of the control unit 1 in advance. Yes.
- the movement processing unit 14 moves the charge removal member 27 using the second table data when the applied voltage is changed by the voltage changing unit 12.
- step S15 the control unit 1 moves the static elimination member 27 in the first direction D1 or the second direction D2 in accordance with the applied voltage after the change in step S13, thereby separating the photosensitive drum 21 and the static elimination member 27 from each other. Increase or decrease.
- step S ⁇ b> 15 is executed by the movement processing unit 14 of the control unit 1.
- control unit 1 moves the static elimination member 27 in the first direction D1 based on the second table data to reduce the separation distance between the photosensitive drum 21 and the static elimination member 27.
- control unit 1 moves the static elimination member 27 in the second direction D2 based on the second table data to increase the separation distance between the photosensitive drum 21 and the static elimination member 27.
- the separation distance between the photosensitive drum 21 and the charge removal member 27 decreases as the applied voltage applied to the charging roller 220 increases.
- wear of the photosensitive drum 21 is suppressed while ensuring necessary static elimination performance. It is possible.
- the control unit 1 of the image forming apparatus 10 according to the second embodiment may include the first speed changing unit 13A. Specifically, in the image forming apparatus 10 according to the second embodiment, as the applied voltage applied to the charging roller 220 is higher, the separation distance between the photosensitive drum 21 and the charge removal member 27 is decreased, and the photosensitive drum 21 is also used. The difference between the linear speed and the linear speed of the static elimination member 27 may be increased.
- an external additive such as silica contained in the toner may adhere to the static elimination member 27.
- the adhesion amount of the external additive on the charge removal member 27 increases, the contact resistance between the photosensitive drum 21 and the charge removal member 27 increases, and the charge removal performance of the charge removal member 27 decreases.
- the image forming apparatus 10 according to the third embodiment of the present invention will be described below with reference to FIGS.
- the configurations of the control unit 1 and the image forming unit 2 are different from those of the first embodiment.
- Other configurations are common to the first embodiment and the third embodiment.
- the density sensor 29 is not provided in the image forming unit 2.
- control unit 1 replaces the concentration detection unit 11, the voltage change unit 12, and the first speed change unit 13A with a first acquisition processing unit 15A and a first change amount acquisition unit 16A. And a second speed changing unit 13B.
- the ROM of the control unit 1 stores in advance a second speed change program for causing the CPU to execute a second speed change process described later (see the flowchart of FIG. 17). Then, the control unit 1 executes the second speed change program stored in the ROM using the CPU, so that the first acquisition processing unit 15A, the first change amount acquisition unit 16A, and the second speed It functions as the changing unit 13B.
- the first acquisition processing unit 15A acquires a cumulative value of toner (developer) consumption based on a preset first acquisition condition.
- the first acquisition processing unit 15A acquires a cumulative value of toner consumption when a predetermined second timing has arrived.
- the second timing is the same as the first timing, when the image forming apparatus 10 is turned on, when a part of the functions of the image forming apparatus 10 is stopped, when returning from the sleep state to the normal state, and when the printing is performed. For example, when processing is executed.
- a cumulative print rate that is a cumulative value of the print rate of each printed matter output from the image forming device 10 is stored in a predetermined third storage area of the EEPROM.
- the control unit 1 calculates a printing rate in each printed matter output by the printing process based on image data printed by the printing process.
- the control unit 1 converts each calculated printing rate into a printing rate for a sheet of the reference size. To do. Then, the control unit 1 updates the cumulative printing rate stored in the third storage area based on the calculated or converted total values of the printing rates.
- the first acquisition processing unit 15A acquires a cumulative value of toner consumption based on the cumulative printing rate (an example of the first acquisition condition) stored in the third storage area. For example, the first acquisition processing unit 15A acquires a cumulative value of toner consumption by multiplying the cumulative printing rate read from the third storage area by a predetermined coefficient.
- the first acquisition processing unit 15A accumulates the toner consumption based on the cumulative number of printed sheets (another example of the first acquisition condition) that is the cumulative value of the number of printed materials output by the image forming apparatus 10. A value may be acquired.
- the first change amount acquisition unit 16A acquires the change amount ⁇ Rb of the contact resistance component Rb of the contact impedance Z2 of the charge removal member 27 based on the cumulative value of the toner consumption acquired by the first acquisition processing unit 15A.
- the third table data indicating the change amount ⁇ Rb of the contact resistance component Rb of the static elimination member 27 corresponding to each predetermined cumulative value of toner consumption is stored in the ROM of the control unit 1 in advance.
- the first change amount acquisition unit 16A acquires the change amount ⁇ Rb of the contact resistance component Rb of the charge removal member 27 based on the cumulative amount of toner consumption acquired by the first acquisition processing unit 15A and the third table data.
- the third table data is created based on experimental data obtained by an experiment investigating the relationship between the cumulative value of toner consumption in the image forming apparatus 10 using the image forming apparatus 10 and the contact resistance component Rb.
- FIG. 18 shows an example of experimental data obtained by the experiment.
- FIG. 18 shows the relationship between the cumulative printing rate P used for calculating the cumulative value of the toner consumption and the contact resistance component Rb.
- the control unit 1 may be stored in advance in the ROM of the control unit 1 to indicate the relationship between the cumulative printing rate P derived from the experimental data shown in FIG. 18 and the change amount ⁇ Rb of the contact resistance component Rb. .
- the first change amount acquisition unit 16A may acquire the change amount ⁇ Rb of the contact resistance component Rb based on the cumulative printing rate P read from the third storage area and the following equation (8).
- the control unit 1 may not include the first acquisition processing unit 15A.
- F, G, and H are constants derived from the experimental data shown in FIG.
- the second speed changing unit 13B calculates the difference between the linear speed of the photosensitive drum 21 and the linear speed of the charge eliminating member 27 in accordance with an increase in the cumulative value of the toner consumption acquired based on the first acquisition condition. increase.
- the second speed changing unit 13B is configured such that the linear speed of the static elimination member 27 is such that the ratio Sr satisfies the above formula (2) and the following formula (9), and the difference from the linear speed of the photosensitive drum 21 is the smallest.
- the second specific speed is changed.
- the static elimination member 27 rotates at a higher linear speed than the photosensitive drum 21 as described above. Therefore, the second speed changing unit 13B increases the linear speed of the static elimination member 27 and increases the difference between the linear speed of the photosensitive drum 21 and the linear speed of the static elimination member 27.
- the second speed changing unit 13 ⁇ / b> B decreases the linear speed of the static elimination member 27 to reduce the linear speed of the photosensitive drum 21 and the static elimination member 27. The difference from the linear velocity may be increased.
- the internal resistance component Ra, the contact resistance component Rb, and the calculated resistance value R21 are stored in the ROM of the control unit 1 in advance.
- the second speed change unit 13B calculates the internal resistance component Ra, the contact resistance component Rb, and the calculation stored in the ROM.
- the resistance value R21 the linear velocity of the static elimination member 27 that satisfies the above-described conditions is calculated.
- the 2nd speed change part 13B changes the linear velocity of the static elimination member 27 based on a calculation result.
- the second speed changing unit 13B may change the linear speed of the static elimination member 27 to a speed where the difference from the second specific speed is equal to or less than the allowable value. Further, the second speed changing unit 13B may change the linear speed of the static elimination member 27 to a speed at which the ratio Sr satisfies the above formula (2) and the above formula (9).
- fourth table data indicating the linear velocity of the charge eliminating member 27 corresponding to each predetermined cumulative value of toner consumption may be stored in the ROM of the control unit 1 in advance.
- the second speed changing unit 13B may change the linear speed of the charge removal member 27 using the accumulated value of the toner consumption acquired by the first acquisition processing unit 15A and the fourth table data.
- the control unit 1 may not include the first change amount acquisition unit 16A.
- the fourth table data includes experimental data obtained by an experiment for investigating the relationship between the cumulative value of toner consumption using the image forming apparatus 10 and the post-charge potential V1, and the ratio using the image forming apparatus 10. It is created based on experimental data obtained by an experiment investigating the relationship between Sr and the post-static discharge potential V1.
- the second speed changing unit 13B may change the linear speed of the photosensitive drum 21 to increase the difference between the linear speed of the photosensitive drum 21 and the linear speed of the charge removal member 27. Further, the second speed changing unit 13B may increase the difference between the linear speed of the photosensitive drum 21 and the linear speed of the charge removal member 27 within a range equal to or less than a preset upper limit value.
- step S21 the control unit 1 determines whether or not the second timing has arrived.
- control unit 1 determines that the second timing has arrived (Yes side of S21)
- the control unit 1 shifts the processing to step S22. If the second timing has not arrived (No side in S21), the control unit 1 waits for the arrival of the second timing in step S21.
- step S ⁇ b> 22 the control unit 1 acquires a cumulative value of toner consumption in the image forming apparatus 10.
- the processing of step S21 and step S22 is executed by the first acquisition processing unit 15A of the control unit 1.
- control unit 1 obtains a cumulative value of toner consumption by multiplying the cumulative printing rate read from the third storage area by the coefficient.
- step S23 the control unit 1 acquires the change amount ⁇ Rb of the contact resistance component Rb of the charge removal member 27 based on the cumulative value of the toner consumption acquired in step S22.
- the process of step S23 is executed by the first change amount acquisition unit 16A of the control unit 1. Note that the process of step S23 may be omitted.
- control unit 1 acquires the change amount ⁇ Rb of the contact resistance component Rb of the charge removal member 27 based on the cumulative value of the toner consumption acquired in step S22 and the third table data.
- step S24 the control unit 1 changes the linear velocity of the charge removal member 27 based on the change amount ⁇ Rb of the contact resistance component Rb of the charge removal member 27 acquired in step S23.
- the process of step S24 is executed by the second speed changing unit 13B of the control unit 1.
- control unit 1 sets the linear velocity of the static elimination member 27 so that the ratio Sr satisfies the above formulas (2) and (9) and the difference from the linear velocity of the photosensitive drum 21 is minimized. Change to the second specific speed. For example, the control unit 1 rewrites data indicating the set value of the linear velocity of the static elimination member 27 stored in the second storage area of the RAM, and changes the linear velocity of the static elimination member 27.
- the linear velocity of the photosensitive drum 21 and the charge eliminating member are increased in accordance with the increase in the cumulative value of the toner consumption acquired based on the first acquisition condition.
- the difference from the linear velocity of 27 increases. Thereby, it is possible to suppress a decrease in the charge removal performance of the charge removal member 27 accompanying an increase in the amount of the external additive attached to the charge removal member 27.
- the linear velocity of the static elimination member 27 is such that the ratio Sr satisfies the above formulas (2) and (9) and is different from the linear velocity of the photosensitive drum 21. Is changed to the second specific speed that minimizes. As a result, the difference between the linear speed of the photosensitive drum 21 and the linear speed of the charge removal member 27 is minimized within a range in which the necessary charge removal performance can be secured. For this reason, it is possible to suppress wear of the photosensitive drum 21.
- the second speed changing unit 13B has the highest cumulative print rate acquired for each of the divided areas among the predetermined divided areas in the main scanning direction orthogonal to the conveyance direction of the sheet on which the image is formed.
- the EEPROM of the control unit 1 is provided with a plurality of storage areas in which the cumulative printing rate for each of the divided areas is stored.
- the first acquisition processing unit 15A obtains a cumulative value of toner consumption by multiplying the cumulative printing rate corresponding to the specific divided area by the number of the divided areas and the coefficient. It is done. According to this configuration, it is possible to set the linear velocity of the static elimination member 27 with reference to the location where the amount of the external additive attached in the main scanning direction is the largest in the static elimination member 27.
- the cleaning member 274 is a blade-like member that is long in the axial direction of the rotation shaft of the photosensitive drum 21, and is provided in contact with the brush bristles 271 of the charge removal member 27.
- the cleaning member 274 is provided at a position that bites into the outer diameter of the charge removal member 27 by 0.1 mm to 1.1 mm. According to this configuration, it is possible to suppress the adhesion of the external additive to the static elimination member 27.
- the image forming apparatus 10 is provided with the cleaning member 274, it is conceivable to correct the contents of the third table data, the above equation (8), and the fourth table data.
- the tip of the brush bristles 271 in contact with the photosensitive drum 21 is curved as the number of executions of the printing process increases, and the outer diameter of the static elimination member 27 is increased. May decrease.
- the outer diameter of the static elimination member 27 is reduced, the contact area between the photosensitive drum 21 and the static elimination member 27 is reduced, and the contact resistance between the photosensitive drum 21 and the static elimination member 27 is increased. The static elimination performance is reduced.
- the image forming apparatus 10 according to the fourth embodiment of the present invention will be described below with reference to FIGS.
- the configurations of the control unit 1 and the image forming unit 2 are different from those of the first embodiment.
- Other configurations are common between the first embodiment and the fourth embodiment.
- the density sensor 29 is not provided in the image forming unit 2.
- control unit 1 replaces the concentration detection unit 11, the voltage change unit 12, and the first speed change unit 13A with a second acquisition processing unit 15B and a second change amount acquisition unit 16B. And a third speed changing unit 13C.
- the ROM of the control unit 1 stores in advance a third speed change program for causing the CPU to execute a third speed change process described later (see the flowchart of FIG. 21). Then, the control unit 1 uses the CPU to execute the third speed change program stored in the ROM, thereby obtaining a second acquisition processing unit 15B, a second change amount acquisition unit 16B, and a third speed. It functions as the changing unit 13C.
- the second acquisition processing unit 15B acquires the outer diameter of the static elimination member 27 based on the second acquisition condition set in advance.
- the second acquisition processing unit 15B acquires the outer diameter of the static elimination member 27 when a predetermined third timing arrives.
- the third timing is similar to the first timing, when the image forming apparatus 10 is turned on, when a part of the functions of the image forming apparatus 10 is stopped, and when returning from the sleep state to the normal state, and when the printing is performed. For example, when processing is executed.
- the second acquisition processing unit 15B acquires the outer diameter of the charge removal member 27 based on the cumulative number of printed sheets (an example of the second acquisition condition) in the image forming apparatus 10.
- the cumulative number of prints in the image forming apparatus 10 is stored in a predetermined fourth storage area of the EEPROM.
- the control unit 1 updates the cumulative number of printed sheets stored in the fourth storage area every time the printing process is executed.
- fifth table data indicating the outer diameter of the charge removal member 27 corresponding to each of the predetermined cumulative number of printed sheets is stored in the ROM of the control unit 1 in advance.
- the second acquisition processing unit 15B acquires the outer diameter of the charge removal member 27 based on the cumulative number of printed sheets and the fifth table data read from the fourth storage area.
- the fifth table data is created based on experimental data obtained by an experiment investigating the relationship between the cumulative number of printed sheets and the outer diameter of the charge removal member 27 in the image forming apparatus 10 using the image forming apparatus 10.
- FIG. 22 shows an example of experimental data obtained by the experiment.
- the second acquisition processing unit 15B may acquire the outer diameter of the charge removal member 27 based on the cumulative number of rotations of the charge removal member 27 (another example of the second acquisition condition). Further, the second acquisition processing unit 15B acquires the outer diameter of the static elimination member 27 based on the value of the current flowing through the first drive unit 272 that drives the static elimination member 27 (another example of the second acquisition condition). Also good. Further, the second acquisition processing unit 15B acquires the outer diameter of the static elimination member 27 based on any one of the cumulative number of printed sheets, the cumulative number of rotations, and the current value flowing through the first driving unit 272. Also good.
- the second acquisition processing unit 15B calculates an average value of the outer diameter of the static elimination member 27 acquired based on the cumulative number of printed sheets and the outer diameter of the static elimination member 27 acquired based on the cumulative number of rotations. You may acquire as an outer diameter of the static elimination member 27.
- FIG. 15B calculates an average value of the outer diameter of the static elimination member 27 acquired based on the cumulative number of printed sheets and the outer diameter of the static elimination member 27 acquired based on the cumulative number of rotations. You may acquire as an outer diameter of the static elimination member 27.
- the second change amount acquisition unit 16B acquires the change amount ⁇ Rb of the contact resistance component Rb of the contact impedance Z2 of the charge removal member 27 based on the decrease amount of the outer diameter of the charge removal member 27 acquired by the second acquisition processing unit 15B. To do.
- the sixth table data indicating the change amount ⁇ Rb of the contact resistance component Rb of the static elimination member 27 corresponding to each predetermined reduction amount of the outer diameter of the static elimination member 27 is previously stored in the control unit 1.
- the second change amount acquisition unit 16B is based on the outer diameter of the charge removal member 27 acquired by the second acquisition processing unit 15B and the outer diameter of the charge removal member 27 stored in advance in the ROM when the image forming apparatus 10 is manufactured.
- the reduction amount of the outer diameter of the static elimination member 27 is calculated.
- change_quantity acquisition part 16B acquires variation
- the sixth table data is created based on experimental data obtained by an experiment investigating the relationship between the reduction amount of the outer diameter of the static elimination member 27 using the image forming apparatus 10 and the contact resistance component Rb.
- the third speed changing unit 13C increases the difference between the linear velocity of the photosensitive drum 21 and the linear velocity of the static elimination member 27 in accordance with the decrease in the outer diameter of the static elimination member 27 acquired based on the second acquisition condition.
- the third speed changing unit 13 ⁇ / b> C has the linear speed of the static elimination member 27, the ratio Sr satisfies the above formulas (2) and (9), and the difference from the linear speed of the photosensitive drum 21 is the smallest.
- the third specific speed is changed.
- the static elimination member 27 rotates at a higher linear speed than the photosensitive drum 21 as described above. Therefore, the third speed changing unit 13 ⁇ / b> C increases the linear speed of the static elimination member 27 and increases the difference between the linear speed of the photosensitive drum 21 and the linear speed of the static elimination member 27.
- the third speed changing unit 13 ⁇ / b> C decreases the linear speed of the static elimination member 27 to reduce the linear speed of the photosensitive drum 21 and the static elimination member 27. The difference from the linear velocity may be increased.
- the third speed change unit 13C has the internal resistance component Ra, the contact resistance component Rb, And the linear velocity of the static elimination member 27 which satisfy
- 13C of 3rd speed change parts may change the linear speed of the static elimination member 27 into the speed whose difference with the said 3rd specific speed is below the said allowable value.
- the third speed changing unit 13C may change the linear speed of the static elimination member 27 to a speed at which the ratio Sr satisfies the above formula (2) and the above formula (9).
- seventh table data indicating the linear velocity of the neutralizing member 27 corresponding to each predetermined reduction amount of the outer diameter of the neutralizing member 27 is stored in the ROM of the control unit 1 in advance. Also good. In this case, even if the third speed changing unit 13C changes the linear velocity of the static eliminating member 27 using the reduction amount of the outer diameter of the static eliminating member 27 acquired by the second acquisition processing unit 15B and the seventh table data. Good. In this case, the control unit 1 may not include the second change amount acquisition unit 16B.
- the seventh table data uses experimental data obtained by an experiment investigating the relationship between the reduction amount of the outer diameter of the static elimination member 27 using the image forming apparatus 10 and the post-static potential V1, and the image forming apparatus 10. It is created on the basis of experimental data obtained by an experiment investigating the relationship between the ratio Sr and the post-static discharge potential V1.
- the third speed changing unit 13C may change the linear velocity of the photosensitive drum 21 to increase the difference between the linear velocity of the photosensitive drum 21 and the linear velocity of the charge removal member 27. Further, the third speed changing unit 13C may increase the difference between the linear speed of the photosensitive drum 21 and the linear speed of the charge eliminating member 27 within a range that is equal to or less than a preset upper limit value.
- step S31 the control unit 1 determines whether or not the third timing has arrived.
- control part 1 judges that the said 3rd timing has come (Yes side of S31), it will transfer a process to step S32. If the third timing has not arrived (No side in S31), the control unit 1 waits for the arrival of the third timing in step S31.
- step S ⁇ b> 32 the control unit 1 acquires the outer diameter of the static elimination member 27.
- the process of step S31 and step S32 is performed by the 2nd acquisition process part 15B of the control part 1.
- control unit 1 acquires the outer diameter of the charge removal member 27 based on the cumulative number of printed sheets and the fifth table data read from the fourth storage area.
- step S ⁇ b> 33 the control unit 1 acquires the change amount ⁇ Rb of the contact resistance component Rb of the charge removal member 27 based on the decrease amount of the outer diameter of the charge removal member 27 acquired in step S ⁇ b> 32.
- the process of step S33 is executed by the second change amount acquisition unit 16B of the control unit 1. Note that the process of step S33 may be omitted.
- control unit 1 determines whether the static elimination member 27 is based on the outer diameter of the static elimination member 27 acquired in step S32 and the outer diameter of the static elimination member 27 at the time of manufacturing the image forming apparatus 10 stored in advance in the ROM. The amount of decrease in the outer diameter of 27 is calculated. And the control part 1 acquires variation
- change_quantity (DELTA) Rb of the contact resistance component Rb of the static elimination member 27 based on the reduction
- step S34 the control unit 1 changes the linear velocity of the charge removal member 27 based on the change amount ⁇ Rb of the contact resistance component Rb of the charge removal member 27 acquired in step S33.
- the process of step S34 is executed by the third speed changing unit 13C of the control unit 1.
- control unit 1 sets the linear velocity of the static elimination member 27 so that the ratio Sr satisfies the above formulas (2) and (9) and the difference from the linear velocity of the photosensitive drum 21 is minimized. Change to the third specific speed. For example, the control unit 1 rewrites data indicating the set value of the linear velocity of the static elimination member 27 stored in the second storage area of the RAM, and changes the linear velocity of the static elimination member 27.
- the linear velocity of the photosensitive drum 21 and the charge removal member 27 are changed according to the decrease in the outer diameter of the charge removal member 27 acquired based on the second acquisition condition.
- the difference from the linear speed increases. Thereby, it is possible to suppress a decrease in the charge removal performance of the charge removal member 27 due to a decrease in the outer diameter of the charge removal member 27.
- the linear velocity of the static elimination member 27 is such that the ratio Sr satisfies the above formulas (2) and (9) and is different from the linear velocity of the photosensitive drum 21. Is changed to the third specific speed. As a result, the difference between the linear speed of the photosensitive drum 21 and the linear speed of the charge removal member 27 is minimized within a range in which the necessary charge removal performance can be secured. For this reason, it is possible to suppress wear of the photosensitive drum 21.
- the image forming apparatus 10 may include a rotation control unit 17 as a modified example of the fourth embodiment.
- the rotation control unit 17 increases the accumulated number of printed sheets or the accumulated number of rotations by a predetermined reference value at a predetermined fourth timing different from the execution time of the printing process.
- the neutralizing member 27 is rotated in the direction opposite to the rotation direction when the printing process is executed.
- the rotation control unit 17 rotates the static elimination member 27 in a direction opposite to the rotation direction at the time of executing the printing process for a predetermined time or the number of rotations. According to this configuration, since the curvature of the tip of the brush bristles 271 is periodically corrected, a decrease in the outer diameter of the static elimination member 27 can be suppressed.
- the rotation control unit 17 is provided in the image forming apparatus 10, it is conceivable to correct the contents of the fifth table data.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Cleaning In Electrography (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
図1に示されるように、本発明の第1実施形態に係る画像形成装置10は、制御部1、画像形成部2、給紙部3、及び排紙部4などを備える電子写真方式のモノクロプリンターである。本発明に係る画像形成装置の他の例には、ファックス、コピー機、及び複合機などが含まれる。また、本発明に係る画像形成装置は、第1実施形態で説明するようにモノクロ対応の画像形成装置10に限らず、各色に対応する画像形成部を備えるタンデム方式などのカラー印刷可能な電子写真方式の画像形成装置であってもよい。
以下、図5~図8を参照しつつ、画像形成装置10における測定結果について説明する。
以下、図11を参照しつつ、画像形成装置10において制御部1により実行される第1速度変更処理の手順の一例について説明する。ここで、ステップS11、S12・・・は、制御部1により実行される処理手順(ステップ)の番号を表している。
まず、ステップS11において、制御部1は、前記第1タイミングが到来したか否かを判断する。
ステップS12において、制御部1は、前記濃度検出処理を実行する。ここで、ステップS11及びステップS12の処理は、制御部1の濃度検出部11により実行される。
ステップS13において、制御部1は、ステップS12で検出された前記パッチ画像の濃度に基づいて、前記印加電圧を変更する。ここで、ステップS13の処理は、制御部1の電圧変更部12により実行される。
ステップS14において、制御部1は、ステップS13における変更後の前記印加電圧に応じて、除電部材27の線速を変更する。ここで、ステップS14の処理は、制御部1の第1速度変更部13Aにより実行される。
以下、図13~図15を参照しつつ、本発明の第2実施形態に係る画像形成装置10について説明する。第2実施形態に係る画像形成装置10では、除電部材27及び制御部1の構成が第1実施形態と異なる。なお、その他の構成は、第1実施形態と第2実施形態とで共通である。
以下、図15を参照しつつ、画像形成装置10において制御部1により実行される接触圧力変更処理の手順の一例について説明する。なお、前記接触圧力変更処理に含まれる各ステップのうち、前記第1速度変更処理に含まれるステップと処理内容が共通するステップについては、前記第1速度変更処理と同一の符号を付し示すことによりその説明を省略する。
ステップS15において、制御部1は、ステップS13における変更後の前記印加電圧に応じて、除電部材27を第1方向D1又は第2方向D2に移動させて感光体ドラム21及び除電部材27の離間距離を増減させる。ここで、ステップS15の処理は、制御部1の移動処理部14により実行される。
以下、図16~図19を参照しつつ、本発明の第3実施形態に係る画像形成装置10について説明する。第3実施形態に係る画像形成装置10では、制御部1及び画像形成部2の構成が第1実施形態と異なる。なお、その他の構成は、第1実施形態と第3実施形態とで共通である。
以下、図17を参照しつつ、画像形成装置10において制御部1により実行される第2速度変更処理の手順の一例について説明する。
まず、ステップS21において、制御部1は、前記第2タイミングが到来したか否かを判断する。
ステップS22において、制御部1は、画像形成装置10におけるトナーの消費量の累積値を取得する。ここで、ステップS21及びステップS22の処理は、制御部1の第1取得処理部15Aにより実行される。
ステップS23において、制御部1は、ステップS22で取得されたトナーの消費量の累積値に基づいて、除電部材27の接触抵抗成分Rbの変化量ΔRbを取得する。ここで、ステップS23の処理は、制御部1の第1変化量取得部16Aにより実行される。なお、ステップS23の処理は省略されてもよい。
ステップS24において、制御部1は、ステップS23で取得された除電部材27の接触抵抗成分Rbの変化量ΔRbに基づいて、除電部材27の線速を変更する。ここで、ステップS24の処理は、制御部1の第2速度変更部13Bにより実行される。
以下、図20~図23を参照しつつ、本発明の第4実施形態に係る画像形成装置10について説明する。第4実施形態に係る画像形成装置10では、制御部1及び画像形成部2の構成が第1実施形態と異なる。なお、その他の構成は、第1実施形態と第4実施形態とで共通である。
以下、図21を参照しつつ、画像形成装置10において制御部1により実行される第3速度変更処理の手順の一例について説明する。
まず、ステップS31において、制御部1は、前記第3タイミングが到来したか否かを判断する。
ステップS32において、制御部1は、除電部材27の外径を取得する。ここで、ステップS31及びステップS32の処理は、制御部1の第2取得処理部15Bにより実行される。
ステップS33において、制御部1は、ステップS32で取得された除電部材27の外径の減少量に基づいて、除電部材27の接触抵抗成分Rbの変化量ΔRbを取得する。ここで、ステップS33の処理は、制御部1の第2変化量取得部16Bにより実行される。なお、ステップS33の処理は省略されてもよい。
ステップS34において、制御部1は、ステップS33で取得された除電部材27の接触抵抗成分Rbの変化量ΔRbに基づいて、除電部材27の線速を変更する。ここで、ステップS34の処理は、制御部1の第3速度変更部13Cにより実行される。
Claims (14)
- 感光体と、電気的に接地されており前記感光体の表面に接触して回転可能に配置される除電部材と、を備える画像形成装置であって、
交流インピーダンス法による予め定められた周波数範囲のCole-Coleプロットから得られる前記除電部材の内部インピーダンスの抵抗成分及び接触インピーダンスの抵抗成分について、
前記内部インピーダンスの抵抗成分が、前記感光体及び前記除電部材の接触幅を前記感光体の線速で除して得られる除電時間の間に前記感光体の除電前電位を予め定められた除電後電位まで低下させるために必要な前記除電部材の直流抵抗値として予め定められた演算式に基づいて算出される算定抵抗値に、前記感光体の線速に対する前記除電部材の線速の比率に基づいて算出される第1特定値を乗じた値以下であり、
前記接触インピーダンスの抵抗成分が、前記算定抵抗値に、前記比率に基づいて算出される第2特定値を乗じた値以下である画像形成装置。 - 前記感光体を帯電させる帯電部材と、
前記帯電部材に印加される印加電圧を変更する電圧変更部と、
前記帯電部材に印加される前記印加電圧が高いほど、前記感光体の線速と前記除電部材の線速との差を増加させる速度変更部と、
を備える請求項3に記載の画像形成装置。 - 前記速度変更部が、前記除電部材の線速を、前記比率Srが上記(4)式及び上記(5)式を満たし、且つ前記感光体の線速との差が最小となる特定速度、又は前記特定速度との差が予め設定された許容値以下の速度に変更する、
請求項5に記載の画像形成装置。 - 前記除電部材の線速は、前記感光体の線速より速い、
請求項1に記載の画像形成装置。 - 前記除電部材の線速は、前記感光体の線速より遅い、
請求項1に記載の画像形成装置。 - 前記内部インピーダンスの静電容量成分及び前記接触インピーダンスの静電容量成分について、
前記接触インピーダンスの静電容量成分を前記内部インピーダンスの静電容量成分で除した値が予め定められた第3特定値以下であり、且つ、前記内部インピーダンスの静電容量成分が予め定められた第4特定値以下である、
請求項1に記載の画像形成装置。 - 前記第3特定値が0.4であって、前記第4特定値が1.0E+05である、
請求項9に記載の画像形成装置。 - 前記感光体が接触型の帯電部材によって帯電される、
請求項1に記載の画像形成装置。 - 前記感光体が直流電圧の印加によって帯電される、
請求項1に記載の画像形成装置。 - 前記除電部材が、円筒状の基体部、及び一端が前記基体部に固定され他端が前記感光体の表面に接触するブラシ毛を有し、
前記ブラシ毛が、樹脂製の芯部、及び前記芯部の表面を覆うカーボン製の表層部を有する、
請求項1に記載の画像形成装置。 - 請求項1に記載の画像形成装置で用いられる前記除電部材。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18745198.4A EP3413139B1 (en) | 2017-01-27 | 2018-01-12 | Electrophotographic image forming device and static eliminating member used in image forming device |
US16/081,152 US10310441B2 (en) | 2017-01-27 | 2018-01-12 | Electrophotographic image forming apparatus, and electricity removing member used in image forming apparatus |
JP2018526606A JP6516069B2 (ja) | 2017-01-27 | 2018-01-12 | 電子写真方式の画像形成装置、及び画像形成装置に用いられる除電部材 |
CN201880001195.8A CN108713170B (zh) | 2017-01-27 | 2018-01-12 | 电子照相方式的图像形成装置及用于图像形成装置的除电部件 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017013229 | 2017-01-27 | ||
JP2017-013229 | 2017-01-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018139219A1 true WO2018139219A1 (ja) | 2018-08-02 |
Family
ID=62978285
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2018/000636 WO2018139219A1 (ja) | 2017-01-27 | 2018-01-12 | 電子写真方式の画像形成装置、及び画像形成装置に用いられる除電部材 |
Country Status (5)
Country | Link |
---|---|
US (1) | US10310441B2 (ja) |
EP (1) | EP3413139B1 (ja) |
JP (1) | JP6516069B2 (ja) |
CN (1) | CN108713170B (ja) |
WO (1) | WO2018139219A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01154186A (ja) | 1987-12-11 | 1989-06-16 | Shindengen Electric Mfg Co Ltd | 画像形成装置 |
JP2000231286A (ja) * | 1998-11-24 | 2000-08-22 | Ricoh Co Ltd | 電子写真方式の画像形成装置における除電技術及びクリーニング技術の改良 |
JP2002318494A (ja) * | 2001-04-20 | 2002-10-31 | Fuji Xerox Co Ltd | 画像形成装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4967231A (en) * | 1987-12-29 | 1990-10-30 | Kabushiki Kaisha Toshiba | Apparatus for forming an electrophotographic latent image |
US6548218B1 (en) * | 1994-06-22 | 2003-04-15 | Canon Kabushiki Kaisha | Magnetic particles for charging means, and electrophotographic apparatus, process cartridge and image forming method including same |
US6512909B2 (en) * | 2000-08-03 | 2003-01-28 | Kyocera Corporation | Image forming process and apparatus and control method thereof |
JP3920191B2 (ja) * | 2002-10-29 | 2007-05-30 | シャープ株式会社 | 異物除去機構,印刷装置および異物除去方法 |
JP2014153488A (ja) * | 2013-02-07 | 2014-08-25 | Fuji Xerox Co Ltd | 画像形成装置 |
JP2016161932A (ja) * | 2015-03-05 | 2016-09-05 | キヤノン株式会社 | 画像形成装置 |
JP2016173520A (ja) * | 2015-03-18 | 2016-09-29 | 株式会社沖データ | 画像形成装置および画像形成方法 |
US10042318B2 (en) * | 2016-03-31 | 2018-08-07 | Kyocera Document Solutions Inc. | Electrophotographic image forming apparatus and electricity removing member used in the same |
-
2018
- 2018-01-12 JP JP2018526606A patent/JP6516069B2/ja not_active Expired - Fee Related
- 2018-01-12 CN CN201880001195.8A patent/CN108713170B/zh not_active Expired - Fee Related
- 2018-01-12 WO PCT/JP2018/000636 patent/WO2018139219A1/ja active Application Filing
- 2018-01-12 US US16/081,152 patent/US10310441B2/en not_active Expired - Fee Related
- 2018-01-12 EP EP18745198.4A patent/EP3413139B1/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01154186A (ja) | 1987-12-11 | 1989-06-16 | Shindengen Electric Mfg Co Ltd | 画像形成装置 |
JP2000231286A (ja) * | 1998-11-24 | 2000-08-22 | Ricoh Co Ltd | 電子写真方式の画像形成装置における除電技術及びクリーニング技術の改良 |
JP2002318494A (ja) * | 2001-04-20 | 2002-10-31 | Fuji Xerox Co Ltd | 画像形成装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3413139A4 |
Also Published As
Publication number | Publication date |
---|---|
CN108713170A (zh) | 2018-10-26 |
EP3413139A4 (en) | 2019-08-21 |
JP6516069B2 (ja) | 2019-05-22 |
EP3413139A1 (en) | 2018-12-12 |
US10310441B2 (en) | 2019-06-04 |
CN108713170B (zh) | 2021-01-12 |
JPWO2018139219A1 (ja) | 2019-01-31 |
EP3413139B1 (en) | 2021-12-22 |
US20190072894A1 (en) | 2019-03-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5871520B2 (ja) | 画像形成装置 | |
JP7199880B2 (ja) | 画像形成装置 | |
JP4749152B2 (ja) | 画像形成装置 | |
JP6091199B2 (ja) | 画像形成装置 | |
JP2018146740A (ja) | 画像形成装置 | |
WO2014077416A1 (ja) | 画像形成装置 | |
JP2009186883A (ja) | クリーニング補助ブラシ及びクリーニング装置 | |
US9946216B2 (en) | Image forming apparatus | |
JP6589899B2 (ja) | 画像形成装置、画像形成方法 | |
WO2018139219A1 (ja) | 電子写真方式の画像形成装置、及び画像形成装置に用いられる除電部材 | |
JP6680232B2 (ja) | 画像形成装置、画像形成方法 | |
JP6648707B2 (ja) | 画像形成装置、画像形成方法 | |
JP2006106667A (ja) | 転写装置及び画像形成装置 | |
US10261462B2 (en) | Image forming apparatus | |
JP2017049377A (ja) | 画像形成装置 | |
JP4821782B2 (ja) | 画像形成装置 | |
JP6536088B2 (ja) | 画像形成装置,画像形成方法,およびプログラム | |
JP6724805B2 (ja) | 画像形成装置、除電部材 | |
JP6665800B2 (ja) | 画像形成装置、除電部材 | |
JP2006138891A (ja) | 画像形成装置 | |
JP2018004973A (ja) | 画像形成装置 | |
JP2006011221A (ja) | 画像形成装置 | |
JP2017142448A (ja) | 画像形成装置 | |
JP2019200281A (ja) | 画像形成装置 | |
JP2015118204A (ja) | 画像形成装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2018526606 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2018745198 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2018745198 Country of ref document: EP Effective date: 20180903 |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 18745198 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |