WO2015198705A1 - 画像形成装置 - Google Patents
画像形成装置 Download PDFInfo
- Publication number
- WO2015198705A1 WO2015198705A1 PCT/JP2015/062292 JP2015062292W WO2015198705A1 WO 2015198705 A1 WO2015198705 A1 WO 2015198705A1 JP 2015062292 W JP2015062292 W JP 2015062292W WO 2015198705 A1 WO2015198705 A1 WO 2015198705A1
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- WIPO (PCT)
- Prior art keywords
- toner
- image forming
- image
- forming apparatus
- unit
- Prior art date
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0142—Structure of complete machines
- G03G15/0178—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image
- G03G15/0189—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image primary transfer to an intermediate transfer belt
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
- G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
- G03G15/1665—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
- G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
- G03G15/1605—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer using at least one intermediate support
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- 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
- G03G21/0094—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge fatigue treatment of the photoconductor
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
- G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
- G03G15/1665—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat
- G03G15/167—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat at least one of the recording member or the transfer member being rotatable during the transfer
- G03G15/1675—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat at least one of the recording member or the transfer member being rotatable during the transfer with means for controlling the bias applied in the transfer nip
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- 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
- G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
- G03G21/0011—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium using a blade; Details of cleaning blades, e.g. blade shape, layer forming
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- 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
- G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
- G03G21/0058—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium using a roller or a polygonal rotating cleaning member; Details thereof, e.g. surface structure
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- 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
- G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
- G03G21/007—Arrangement or disposition of parts of the cleaning unit
- G03G21/0076—Plural or sequential cleaning devices
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- 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
- G03G21/14—Electronic sequencing control
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
- G03G2215/00535—Stable handling of copy medium
- G03G2215/00556—Control of copy medium feeding
- G03G2215/00569—Calibration, test runs, test prints
Definitions
- the present invention relates to an image forming apparatus used for, for example, a copying machine, a printer, a facsimile machine or the like.
- a laser scanning unit is used on the peripheral surfaces of a plurality of photosensitive drums corresponding to yellow (Y), magenta (M), cyan (C), and black (BK), respectively. An electric latent image is formed, and each color toner image is generated by each color toner.
- the toner images of the respective colors generated on the peripheral surfaces of the respective photoconductive drums are sequentially superimposed and transferred onto an endless running intermediate transfer belt, thereby synthesizing a color image on the intermediate transfer belt.
- the color image synthesized on the intermediate transfer belt is transferred to a sheet material made of paper or the like using a transfer roller, and then pressed and heated by a fixing device to form a color image.
- the toner remaining on the surface of the photoconductor without being transferred by the primary transfer portion is collected by a photoconductor cleaning device, and the photoconductor is polished by attaching the collected toner to the surface of the polishing roller.
- silica for the purpose of imparting fluidity and metal particles that are abrasive particles for imparting abrasiveness are often used. Since the metal particles have a lower electrical resistance and a lower charge amount than silica or the like, they tend to be detached from the toner particles and easily remain on the surface of the photoreceptor without being transferred to the intermediate transfer belt in the primary transfer portion. Therefore, when the image printing rate increases, the ratio of the metal particles in the toner collected in the cleaning increases.
- the metal particles Since the outer diameter of the metal particles is as small as about 1/100 of the toner particles, the metal particles pass through the cleaning blade and adhere to the downstream charging device, thereby promoting the contamination of the charging device.
- a tandem type color machine has a plurality of photosensitive units such as yellow, cyan, magenta, and black.
- the printing ratio of each color is greatly different. )
- the difference in the ratio of metal particles in the toner collected in the cleaning device tends to occur, and the difference in the contamination level of the charging device tends to occur.
- the dielectric breakdown of the photoreceptor tends to occur. That is, since the metal particles in the collected toner have an effect of releasing electric charge, if the ratio of the metal particles in the collected toner is low, the toner is excessively charged due to friction in the cleaning device, and the photosensitive member is removed by the cleaning blade. When peeled off from the photosensitive member, the photosensitive member is easily discharged to cause dielectric breakdown of the photosensitive member.
- Patent Document 1 since the operation execution timing needs to be performed after the printing operation is completed or after the printing operation is interrupted, the toner that can be supplied to the drum unit remains on the intermediate transfer belt in the immediately preceding printing operation. There is a problem that the obtained toner is low and the effect obtained is low.
- the present invention has been made in view of such points, and an object of the present invention is to maintain the ratio of metal particles in the collected toner within a predetermined range, thereby suppressing charging device contamination and photoconductor dielectric breakdown. Another object is to provide an image forming apparatus.
- the present invention includes a plurality of photosensitive members, a charging device that contacts and charges each of the photosensitive members, a developing device that develops a latent image by attaching a toner containing metal particles that are abrasive particles, and the photosensitive member
- a cleaning device that removes residual toner from the surface of the body, and forms a color image by sequentially superimposing the toner images of the respective colors formed on the photoreceptor on the intermediate transfer belt.
- An image forming apparatus having a primary transfer bias controller that switches the primary transfer bias other than during image formation on the photosensitive member to the same polarity or opposite polarity as the charge of the toner in accordance with the average print rate of each predetermined number of colors Is the gist.
- the ratio of the metal particles that are abrasive particles in the collected toner in the cleaning device can be maintained within a predetermined range. For this reason, it is possible to suppress contamination of the charging device of each station by metal particles and dielectric breakdown of the photosensitive drum.
- FIG. 1 is a schematic configuration diagram of a copying machine according to an embodiment of the present invention. It is sectional drawing which shows the structure of the drum unit which concerns on embodiment of this invention. 1 is a block diagram illustrating an example of a hardware configuration of a copier according to an embodiment of the present invention. 3 is a flowchart showing control processing of the copying machine according to the embodiment of the present invention.
- FIG. 1 is a schematic configuration diagram of a copying machine P according to an embodiment of the present invention.
- the copying machine (image forming apparatus) P includes a paper discharge portion a, a toner cartridge storage portion b, an image forming portion c, and a paper cassette portion d. Further, the copying machine P is provided with a paper transporting part e from the paper cassette part d located at the lower part to the paper discharge part a located at the upper part. Further, the copying machine P is provided with a scanner unit f for reading a document at the upper part of the paper discharge unit a.
- the paper discharge unit a is configured such that a sheet (sheet material) on which a predetermined image is formed is discharged through the paper transport unit e.
- the bottom surface of the paper discharge unit a is inclined so that one end side can be aligned and stacked when a plurality of sheets are discharged.
- the toner cartridge storage section b can store a black toner (BK) toner cartridge b1, a yellow toner (Y) toner cartridge b2, a cyan toner (C) toner cartridge b3, and a magenta toner (M) toner cartridge b4. It is configured.
- the toner cartridges b1 to b4 are configured to be able to supply toner to the developing unit c2 of the image forming unit c.
- the image forming unit c includes a laser scanning unit c1, a developing unit c2, a drum unit c3, a transfer unit c4, and a fixing unit c5.
- the developing unit c2 and the drum unit c3 are provided on a one-to-one basis corresponding to the toner cartridges b1 to b4.
- the laser scanning unit c1 includes a light beam generator that generates laser light, a polygon mirror that scans a light beam emitted from the light beam generator, and the polygon mirror. And an f ⁇ lens that forms an image on the photosensitive drum 1 to be described later.
- the developing unit c ⁇ b> 2 develops an electrostatic latent image formed on the peripheral surface of the photosensitive drum 1 by supplying toner to the photosensitive drum 1. , They are arranged to face each other in the radial direction.
- the drum unit c3 has a photosensitive member on which an electrostatic latent image is generated on the circumferential surface of the drum by using the laser scanning unit c1 and a toner image is formed by the toner supplied from the toner cartridge storage portion b to the developing unit c2. It has a drum 1.
- a neutralizing lamp 2 that neutralizes the peripheral surface after the transfer
- a cleaning device 3 that removes toner remaining on the peripheral surface after the transfer
- a charge that charges the peripheral surface before the transfer The device 4 is arranged oppositely.
- the neutralizing lamp 2, the cleaning device 3, and the charging device 4 of the present embodiment are unitized as a drum unit c3 together with the photosensitive drum 1 so as to be detachable integrally.
- the transfer unit c4 includes an intermediate transfer belt 5 to which a toner image is transferred from the photosensitive drum 1, a primary transfer roller 6 disposed to face the photosensitive drum 1 with the intermediate transfer belt 5 interposed therebetween, and an intermediate transfer belt 5. Secondary transfer rollers 7 and 8 for secondary transfer of the toner image transferred to the toner image, and a cleaning brush 9 for cleaning the intermediate transfer belt 5.
- a predetermined sheet material for example, a sheet is conveyed through the sheet conveying unit e, the secondary transfer rollers 7 and 8 are rotated with the sheet interposed between the intermediate transfer belts 5, Secondary transfer is performed on the sheet, and the sheet can be conveyed to the fixing unit c5 side.
- the fixing unit c5 is provided in a part of the paper transport unit e on the downstream side of the position where the transfer unit c4 is provided, and a pair of fixing units c5 are arranged so as to sandwich the paper transported through the paper transport unit e. It is composed of rollers.
- the fixing unit c5 is configured so that the toner image on the paper transferred by the transfer unit c4 by being pressed and heated by the pair of rollers can be fixed on the paper.
- the paper cassette portion d is a paper feed cassette provided so as to be freely drawn out from the apparatus main body.
- the paper cassette unit d is configured to be able to supply paper one by one from the paper feed cassette to the paper transport unit e.
- the paper transport unit e is provided from the paper cassette unit d located at the lower part to the paper discharge part a located at the upper part, and includes a plurality of transport rollers and guide plates.
- the paper transport unit e is configured to transport the paper supplied from the paper cassette unit d one by one toward the paper discharge unit a.
- an electrostatic latent image is formed by irradiating the photosensitive drum 1 with laser light corresponding to image data from the laser scanning unit c1, and the toner image is developed with the supplied toner. .
- the toner image carried on the photosensitive drum 1 is transferred onto a sheet by a transfer unit c4, and then subjected to a fixing process by being pressurized and heated by a fixing unit c5. Finally, the paper on which the image is printed is discharged to the paper discharge unit a.
- FIG. 2 is a cross-sectional view showing the configuration of the drum unit c3.
- a static elimination lamp 2 In the drum unit c3, a static elimination lamp 2, a cleaning device 3, and a charging device 4 are disposed around the photosensitive drum 1 so as to face the photosensitive drum 1.
- the static elimination lamp 2 is a light emitting diode (LED), for example.
- the drum unit c3 has a unit frame main body 10 that holds the photosensitive drum 1.
- the unit frame main body 10 is configured to integrally hold the photosensitive drum 1, the cleaning device 3, and the charging device 4.
- the cleaning device 3 is disposed on the side of the photosensitive drum 1, and the charging device 4 is disposed below the photosensitive drum 1.
- the cleaning device 3, the photosensitive drum 1, and the charging device 4 are integrally configured as a drum unit c3 (image carrier unit).
- the drum unit c3 includes a pair of side plates (supports) (not shown) at both ends in the left-right direction (a direction orthogonal to the paper surface of FIG. 2).
- the photosensitive drum 1 is rotatably supported by the pair of side plates. Further, the charging device 4 and the cleaning device 3 are supported to face the photosensitive drum 1 by the pair of side plates.
- the cleaning device 3 includes a cleaning blade 31, a conveying screw 32, and a polishing roller 33.
- the cleaning device 3 cleans the toner adhering to the peripheral surface of the photosensitive drum 1 after the toner image is transferred, and the recovery device (not shown) Transports toner.
- the cleaning blade 31 is a plate-like member made of a rubber material (urethane rubber or the like).
- the cleaning blade 31 is supported on the unit frame main body 10 by a blade holder 34.
- the blade holder 34 is a sheet metal member having an L-shape in the cross-sectional view.
- the cleaning blade 31 and the blade holder 34 are fixed with an adhesive. As a result, a fixed end of the cleaning blade 31 is formed.
- the front end of the cleaning blade 31 is a free end and is brought into contact with the peripheral surface of the photosensitive drum 1.
- the tip of the cleaning blade 31 is in contact with a cylindrical surface on the downstream side in the rotation direction of the photosensitive drum 1 with respect to a polishing roller 33 described later. As a result, the toner remaining (attached) on the peripheral surface of the photosensitive drum 1 is removed by the tip of the cleaning blade 31.
- the conveying screw 32 is rotatably supported by the cleaner housing above the cleaning blade 31.
- the conveying screw 32 includes a shaft portion and a spiral blade member disposed around the shaft portion.
- the conveying screw 32 is scraped off by the cleaning blade 31 and conveys the collected toner deposited on the cleaning blade 31 in the axial direction of the rotating shaft of the photosensitive drum 1.
- the polishing roller 33 is disposed behind the conveying screw 32.
- the polishing roller 33 is a rubber roller whose surface is roughened.
- the polishing roller 33 is rotated by being driven by the photosensitive drum 1 while being in contact with the surface of the photosensitive drum 1.
- the polishing roller 33 collects the toner attached to the cylindrical surface of the photosensitive drum 1. Further, the polishing roller 33 polishes deposits such as discharge products that have adhered to the surface of the photosensitive drum 1. At this time, when a predetermined amount of toner adheres to the peripheral surface of the polishing roller 33, the discharge product removal performance (polishing performance) is improved.
- the charging device 4 includes a charging roller 41 and a cleaning roller 42.
- the charging roller 41 is a roll member whose surface is made of a rubber material.
- a charging voltage is applied to the charging roller 41 from a bias applying unit (not shown).
- the charging roller 41 is rotated while being driven by the photosensitive drum 1 by contacting the circumferential surface of the photosensitive drum 1.
- the peripheral surface of the photosensitive drum 1 is uniformly charged by the charging roller 41 to which the charging voltage is applied.
- the cleaning roller 42 contacts the charging roller 41 and rotates with the charging roller 41 with a linear velocity difference.
- the cleaning roller 42 is a brush roller formed of conductive nylon fibers.
- a charging voltage is applied to the charging roller 41 and a discharge is generated at the contact position with the photosensitive drum 1, whereby a discharge product is attached to the surface of the charging roller 41.
- the cleaning roller 42 is rotated with a linear velocity difference while being in contact with the charging roller 41, so that toner, foreign matter, and the like attached to the surface of the charging roller 41 are suitably removed.
- FIG. 3 is a block diagram showing an example of the hardware configuration of the copying machine P.
- the copier P includes a control unit 90, an operation unit 80, an image input unit 70, a high-voltage power supply unit 50, an exposure device 11, a fixing device 12, an image forming unit c, and the like. .
- the control unit 90 includes a CPU (Central Processing Unit) 91, a ROM (Read Only Memory) 92 that is a read-only storage unit, a RAM (Random Access Memory) 93 that is a readable / writable storage unit, and temporarily stores image data and the like.
- the control unit 90 can be arranged at an arbitrary location inside the apparatus main body.
- control unit 90 transmits a control signal from the CPU 91 to the respective parts and devices in the copying machine P through the I / F 96.
- a signal indicating the state and an input signal are transmitted from each part or device to the CPU 91 through the I / F 96. Examples of each part controlled by the control unit 90 include the image forming unit c, the high-voltage power supply unit 50, the exposure device 11, the fixing device 12, and the operation unit 80.
- the CPU 91 is a central processing unit, and controls and performs each part of the copier P based on a developed control program.
- the ROM 92 stores a control program for the copying machine P, data necessary for control, and the like that are not changed during use of the copying machine P.
- the RAM 93 stores necessary data generated during the control of the copying machine P, data temporarily required for controlling the copying machine P, and the like.
- the RAM 93 (or ROM 92) stores the number of printed sheets that triggers a cleaning operation.
- the counter 95 adds up the number of printed sheets and counts it.
- the computing unit 97 calculates an image printing rate and an average printing rate of a predetermined number of images based on the image data stored in the temporary storage unit 94.
- the calculation unit 97 calculates the average printing rate per sheet from the image data formed on the last 100 photosensitive drums.
- the average printing rate is an index indicating the area of an area where an image is formed with respect to the area of the entire sheet.
- the high-voltage power supply unit 50 includes a charging bias unit 51, a developing bias unit 52, a primary transfer bias control unit 53, a secondary transfer bias unit 54, and an I / F (interface) 56.
- the charging bias unit 51 applies (outputs) a predetermined bias to the charging roller 41 (see FIG. 2) of the charging device 4 in accordance with an output signal from the control unit 90.
- the developing bias unit 52 applies (outputs) a predetermined bias to the developing roller of the developing device 21 in accordance with an output signal from the control unit 90.
- the primary transfer bias control unit 53 switches to the same polarity or reverse polarity as the charging of the toner according to an output signal from the control unit 90, and applies a predetermined bias to the primary transfer roller 6 (see FIG.
- the secondary transfer bias unit 54 applies (outputs) a predetermined bias to the secondary transfer rollers 7 and 8 (see FIG. 1) of the secondary transfer device 23 in accordance with an output signal from the control unit 90.
- the image input unit 70 is a receiving unit that receives image data transmitted to the copying machine P from a personal computer or the like.
- the image signal input from the image input unit 70 is converted into a digital signal and then sent to the temporary storage unit 94.
- the operation unit 80 is provided with a liquid crystal display unit 81, an input key 82, and an LED 83.
- the liquid crystal display unit 81 and the LED 83 indicate the state of the copier P, and display the image forming status and the number of copies to be printed.
- Various settings of the copying machine P are performed from a printer driver of a personal computer.
- the operation unit 80 is provided with a stop / clear button used when image formation is stopped, a reset button used when various settings of the copying machine P are set to the default state, and the like.
- FIG. 4 is a flowchart showing a control process of the copying machine P according to the embodiment of the present invention.
- the printing operation by the copier P is started by the printing command (step S1), and it is determined whether the printing rate flag for each color is “High” or “Low” (step S2). It should be noted that the initial shipment state of the product is “Low”, and after printing one sheet, whether it is “High” according to the condition “Is the average printing rate of the last 100 sheets 10% or more?” In step S7 described later. “Low” is determined and updated as needed.
- the primary transfer bias controller 53 switches the primary transfer bias other than during image formation to a polarity opposite to the charging polarity of the toner (Step S2). S3).
- the primary transfer bias other than during image formation refers to a primary transfer bias of a blank portion immediately before an image, a blank portion between images, and a blank portion after an image.
- the ratio of the metal particles that are abrasive particles in the collected toner increases, so that the charging device 4 is easily contaminated.
- the toner is stirred in the metal particle device in the cleaning device and charged to the same polarity as the toner. Therefore, by applying a primary transfer bias having a polarity opposite to the charging polarity of the toner to the primary transfer roller 6, contamination of the charging device 4 with metal particles can be suppressed.
- the primary transfer bias control unit 53 sets the primary transfer bias other than during image formation to the toner. Is set to the same polarity as the charging polarity (step S4).
- the ratio of metal particles that are abrasive particles in the collected toner is low.
- the metal particles in the collected toner have an effect of releasing electric charge. If the ratio of the metal particles in the collected toner is low, the toner is excessively charged due to friction in the cleaning device 3, and the photosensitive drum is driven by the cleaning blade 31. When it is peeled off, the photosensitive drum 1 is discharged to cause dielectric breakdown of the photosensitive drum 1. Therefore, by applying a primary transfer bias having the same polarity as the charging polarity of the toner to the primary transfer roller 6, the ratio of the metal particles in the collected toner in the cleaning device 3 is increased. Therefore, dielectric breakdown of the photosensitive drum 1 can be suppressed.
- step S5 the calculation unit 97 calculates the printing rate of each color in one page (step S6), and whether the average printing rate of 100 sheets immediately before each color is 10% or more. Is determined (step S7). Even in a situation where the cumulative number of printed sheets is less than 100, the average print rate is calculated from the number of printed sheets until immediately before.
- step S7 If the average printing rate is 10% or more (YES in step S7), the printing rate flag for each color is set to “High” (step S8).
- step S7 if the average printing rate is not 10% or more (No in step S7), the printing rate flag for each color is set to “Low” (step S9).
- step S10 it is determined whether or not there is printing on the next page. If there is printing on the next page (YES in step S10), the process returns to step S2. On the other hand, if there is no printing after the next page (NO in step S10), the printing operation is terminated (step S11).
- the ratio of metal particles in the cleaning device of each station can be maintained within a predetermined range. Therefore, it is possible to suppress the contamination by the external additive of the charging device of each station and the dielectric breakdown of the photosensitive drum.
- step S7 it is determined in step S7 whether or not the average printing rate of the immediately preceding 100 sheets is 10% or more, but is not limited to this, and the average printing rate of the immediately preceding predetermined number of sheets is in descending order. It is also possible to rank the photoconductor drums and similarly perform the processing from step S8 on at least one (for example, one) photoconductor drum in descending order. In this case, the metal particle ratio in the cleaning device of each station can be controlled more accurately.
- the photosensitive drum 1 may be made of either amorphous silicon or OPC, but is preferably made of amorphous silicon.
- the image forming apparatus of the present invention can be applied to, for example, a copying machine, a printer, and a facsimile machine.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Cleaning In Electrography (AREA)
Abstract
Description
次に、図3に基づき本発明の実施形態に係る複写機Pのハードウェア構成を説明する。図3は複写機Pのハードウェア構成の一例を示すブロック図である。
Claims (5)
- 複数の感光体と、
各々の感光体に対して接触して帯電させる帯電装置と、
研磨粒子である金属粒子を含むトナーを付着させて潜像を現像する現像装置と、
前記感光体の表面から残留トナーを除去するクリーニング装置とを備え、
前記感光体上に形成された各色のトナー像を中間転写ベルト上に順次重ね合わせてカラー画像を形成する画像形成装置であって、
直前の所定枚数の各色の平均印字率に応じて、感光体上の画像形成時以外の1次転写バイアスを、トナーの帯電と同極性または逆極性に切り替える1次転写バイアス制御部を有することを特徴とする画像形成装置。 - 請求項1に記載の画像形成装置において、
画像形成時以外の1次転写バイアスが、画像直前の空白部分、画像と画像の間の空白部分、および画像後の空白部分の1次転写バイアスであることを特徴とする画像形成装置。 - 請求項1に記載の画像形成装置において、
直前の所定枚数の平均印字率が所定の印字率よりも高い感光体に対して、画像形成時以外の1次転写バイアスを、トナーの帯電極性と逆極性に切り替え、
所定の印字率よりも低い感光体に対しては、トナーの帯電極性と同極性にすることを特徴とする画像形成装置。 - 請求項1に記載の画像形成装置において、
直前の所定枚数の平均印字率が高い方から少なくとも1つの感光体に対して、画像形成時以外の1次転写バイアスを、トナーの帯電極性と逆極性に切り替え、
他の感光体に対しては、トナーの帯電極性と同極性にすることを特徴とする画像形成装置。 - 請求項1に記載の画像形成装置において、
前記感光体がアモルファスシリコン製であることを特徴とする画像形成装置。
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