WO2020008966A1 - Cleaning blade for electrophotographic device - Google Patents

Cleaning blade for electrophotographic device Download PDF

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Publication number
WO2020008966A1
WO2020008966A1 PCT/JP2019/025270 JP2019025270W WO2020008966A1 WO 2020008966 A1 WO2020008966 A1 WO 2020008966A1 JP 2019025270 W JP2019025270 W JP 2019025270W WO 2020008966 A1 WO2020008966 A1 WO 2020008966A1
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WO
WIPO (PCT)
Prior art keywords
blade
ridge
thickness
toner
blade portion
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Application number
PCT/JP2019/025270
Other languages
French (fr)
Japanese (ja)
Inventor
清水　厚詞
学 作田
利彦 荒田
宮川　新平
Original Assignee
住友理工株式会社
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Application filed by 住友理工株式会社 filed Critical 住友理工株式会社
Publication of WO2020008966A1 publication Critical patent/WO2020008966A1/en

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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

Definitions

  • the present invention relates to a cleaning blade for an electrophotographic device.
  • Electrophotographic devices such as copiers, printers, and facsimile machines that employ an electrophotographic system are provided with a cleaning blade for removing toner remaining on an outer peripheral surface of an image carrier (photosensitive drum, transfer belt, etc.).
  • the cleaning blade is in contact with the outer peripheral surface of the image carrier at its tip, and remains on the outer peripheral surface of the photosensitive drum by its tip contacting and sliding on the outer peripheral surface of the rotating image carrier. The toner has been removed.
  • the cleaning blade may be arranged so as to contact the upper part of the image carrier from, for example, an arrangement space.
  • the toner scraped off at the tip of the cleaning blade accumulates on the tip, so that if the amount of accumulated toner increases, the toner may return to the image carrier from the tip.
  • Patent Document 1 discloses a cleaning blade in which a toner leakage prevention protrusion is formed at a cleaning side end that contacts a photosensitive drum at both ends in a longitudinal direction.
  • the protrusion prevents liquid excess toner from flowing out from both ends in the longitudinal direction of the cleaning blade.
  • the projection is not shaped to prevent toner that has passed over the cleaning blade from returning to the photosensitive drum. Therefore, the cleaning blade of Patent Document 1 does not prevent the toner that has passed over the cleaning blade from returning to the photosensitive drum.
  • Patent Literature 2 discloses a cleaning blade having an arm portion formed to be longer and thinner than the cleaning portion on the distal end side. However, the shape of the arm portion allows the free length of the blade to be reduced without increasing the pressing force of the blade against the transfer drum. Patent Literature 2 does not describe that the toner passes over the cleaning blade, and does not describe that the toner that has passed over the cleaning blade is collected.
  • the cleaning blade since the cleaning blade repeatedly elastically deforms due to the movement of the image carrier that is in contact with the cleaning blade, the vibration may cause a stick-slip phenomenon. Therefore, the cleaning blade is required to improve the toner collection rate while suppressing the stick-slip phenomenon.
  • a problem to be solved by the present invention is to provide a cleaning blade for an electrophotographic device in which the stick-slip phenomenon is suppressed and the toner recovery rate is improved.
  • a cleaning blade for an electrophotographic apparatus includes a blade portion which is made of a rubber elastic body and cleans the surface of the image carrier by rubbing the surface with the tip, and a base for the blade portion.
  • a holding portion joined to the end side, and a cleaning blade for an electrophotographic apparatus, wherein the blade portion has a tip end side opposite to a surface facing the image carrier in a longitudinal direction of the blade portion.
  • t1 is equal to or more than ⁇ ⁇ of the thickness t2 at an intermediate portion between the distal end and the proximal end of the blade portion.
  • a thickness t1 at a distal end of the blade portion is not less than a thickness t2 at an intermediate portion between a distal end and a base end of the blade portion. Further, it is preferable that a thickness t2 at an intermediate portion between the distal end and the proximal end of the blade portion is 1.5 mm or more and less than 3.0 mm.
  • the difference t3-t2 between the thickness t3 at the position where the height of the ridge is the maximum and the thickness t2 at the intermediate portion between the tip and the base of the blade portion is 0.05 mm or more and 3.0 mm or less. Is preferred.
  • the free length L of the blade portion is not less than 5.0 mm and not more than 12 mm. Further, it is preferable that the width S of the ridge is not more than ⁇ of the free length L of the blade portion.
  • the protruding ridge extending along the longitudinal direction of the blade portion is provided on the tip end side of the surface of the blade portion opposite to the surface facing the image carrier.
  • the position where the height of the ridge is the maximum is closer to the proximal end than the distal end of the blade, so that when the toner is scraped, the toner moves over the ridge and moves to the proximal end than the ridge. Since the toner that has moved to the base end side is prevented from returning to the image carrier by the ridge, the toner recovery rate can be improved.
  • the presence of such a ridge increases the volume of the blade portion at the distal end ⁇ than at the base end 1 /, so that the elastic deformation of the blade portion can be reduced and the stick-slip phenomenon occurs. Can be suppressed.
  • the position where the height of the ridge is maximum is closer to the base end than the end of the blade portion on the front end side, the center of gravity of the ridge is closer to the base end, and the stick-slip phenomenon is suppressed.
  • the thickness t1 at the distal end of the blade portion is equal to or more than ⁇ of the thickness t2 at the intermediate portion between the distal end and the base end of the blade portion, the tip of the blade portion at the time of scraping off the toner is removed. Squeak is reduced. Thereby, it is possible to suppress the toner accumulated on the tip of the blade portion from returning to the image carrier, and to suppress a decrease in the toner recovery rate.
  • the thickness t1 at the distal end of the blade portion is equal to or greater than the thickness t2 at the intermediate portion between the distal end and the base end of the blade portion, the volume of the distal half of the blade portion can be increased. Therefore, the effect of reducing the elastic deformation of the blade portion is improved, and the effect of suppressing the stick-slip phenomenon is improved.
  • the thickness t2 at the intermediate portion between the distal end and the proximal end of the blade portion is 1.5 mm or more, the influence of the thickness t2 on the stick-slip phenomenon can be suppressed to a small value. Further, when the thickness t2 is less than 3.0 mm, the size of the ridge, which increases with the thickness t2, can be suppressed, and the toner can easily get over the ridge at the time of scraping the toner. Can contribute to
  • the transfer to the image bearing member is performed. Excellent due to the effect of suppressing toner reversion.
  • t3-t2 is 3.0 mm or less, the size of the ridge is suppressed, and the toner can easily get over the ridge during scraping of the toner, thereby contributing to an improvement in the toner recovery rate.
  • the free length L of the blade portion is not less than 5.0 mm, the volume of the portion that holds the toner that has moved over the protrusion and moved to the base end side of the protrusion when scraping the toner can be increased. Can contribute to the improvement of the recovery rate. Further, when the free length L is 12 mm or less, the conveyance distance of the toner on the blade portion is suppressed, and the effect of suppressing the return of the toner to the image carrier is more excellent.
  • the width S of the ridge is not more than ⁇ of the free length L, the distance for the toner to move over the ridge and move to the base end side of the ridge when scraping the toner is short. Can easily move to the base end side of the ridge over the ridge, which can contribute to an improvement in the toner recovery rate.
  • FIG. 1 is a perspective view of a cleaning blade for an electrophotographic device according to an embodiment of the present invention.
  • 1 is a side view of a cleaning blade for an electrophotographic device according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram illustrating a state in which a cleaning blade for an electrophotographic device according to an embodiment of the present invention slides on an outer peripheral surface of a rotating image carrier.
  • FIG. 10 is a side view of a cleaning blade for an electrophotographic device according to another embodiment.
  • a cleaning blade (main blade) 10 for an electrophotographic apparatus includes a blade portion 12 made of a rubber elastic body such as urethane rubber, and a base end of the blade portion 12. Holding part 14 joined to the side.
  • the holding section 14 is made of a rigid member such as metal or hard plastic, and has an L-shaped cross section.
  • the x direction is the longitudinal direction of the blade portion 12
  • the y direction is the width direction of the blade portion 12.
  • the blade 10 is arranged on the image carrier such that the longitudinal direction (x direction) of the blade section 12 is parallel to the axial direction of the image carrier (photosensitive drum, transfer belt, etc.).
  • the lower surface 12b of the blade portion 12 is a surface facing the image carrier, and the front end of the surface facing the image carrier is in contact with the surface of the image carrier. It has an abutting portion (edge) 12c to be in contact with.
  • a protrusion 16 extending along the longitudinal direction (x direction) of the blade portion 12 is provided on the distal end side of the surface (upper surface 12a) of the blade portion 12 opposite to the surface facing the image carrier. .
  • the ridge 16 is provided above the upper surface 12a of the blade portion 12 in a direction orthogonal to the upper surface 12a.
  • the upper surface 12a and the lower surface 12b of the blade portion 12 are planes parallel to each other, and the intermediate portion is formed in a flat plate shape.
  • the intermediate portion is a portion excluding a portion of the blade portion 12 having a distal-side ridge and a portion joined to the base-side holding portion. It is a portion that becomes an arm extending to a portion having a side ridge.
  • Abutment angle theta 1 of the edge in 12c of the blade portion 12 is substantially 90 °, preferably in the range of 80 ° ⁇ 100 °.
  • the angle theta 2 of the proximal end face of the top surface 12a and ridges 16 of the blade portion 12 is substantially 90 °, preferably in the range of 80 ° ⁇ 100 °.
  • the tip end of the blade portion 12 is flush with the tip end of the ridge 16.
  • the distal end of the ridge 16 is higher than the upper surface 12a of the intermediate portion, and the thickness t1 at the distal end of the ridge 16 is larger than the thickness t2 of the intermediate portion (t1> t2). ).
  • the ridge 16 is inclined so as to gradually increase from the end on the distal side toward the base end, and the top of the ridge 16 is a smooth slope. Therefore, the base end of the ridge 16 is the position where the height of the ridge 16 is the maximum, and the position where the height of the ridge 16 is the maximum is the end of the blade 12 that is closer to the tip. Is also on the proximal side.
  • the thickness t3 at the base end of the ridge 16, which is the position where the height of the ridge 16 is the maximum, is the thickness at the tip end of the ridge 16 (the tip end of the blade portion 12). It is larger than t1 (t3> t1) and larger than the thickness t2 in the middle part (t3> t2).
  • the contact portion 12c contacts the upper portion of the image carrier 20 with the upper surface 12a of the blade portion 12 facing upward. Is installed as follows. As the image carrier 20 rotates, the surface of the image carrier 20 is rubbed by the contact portion 12c to scrape off the toner 18 remaining on the surface of the image carrier 20 and clean the surface of the image carrier 20. . The toner 18 scraped off by the contact portion 12c gradually accumulates at the tip of the blade portion 12, gradually climbs over the ridge 16 at the tip of the blade portion 12, and from the ridge 16 on the upper surface 12a of the blade portion 12 to the base end. Is moved to the recess formed up to and accommodated in the recess. The toner 18 thus collected is collected in the recess by collecting the scraped toner 18.
  • the ridge 16 is inclined so as to gradually increase from the distal end toward the proximal end, and the thickness t3 at the proximal end of the ridge 16 is closer to the distal end of the ridge 16. Since the position where the thickness is larger than the thickness t1 at the end (t3> t1) and the height of the ridge 16 is the maximum is on the base end side of the end of the blade portion 12 on the front end side, the toner 18 is scraped off. At times, the toner 18 easily moves over the ridges 16 and moves toward the base end side from the ridges 16, and the toner moved to the base end side is prevented from returning to the image carrier 20 by the ridges 16. Recovery rate can be improved.
  • the ridge 16 is inclined so as to gradually increase from the distal end toward the proximal end, and the position where the height of the ridge 16 is maximum is higher than the distal end of the blade portion 12. Is also on the base end side, the center of gravity of the ridge 16 is closer to the base end side, and contributes to suppression of the stick-slip phenomenon.
  • the thickness t1 at the distal end of the blade portion 12 is equal to or more than 1 / of the thickness t2 at the intermediate portion between the distal end and the base end of the blade portion 12, the blade portion at the time of scraping the toner 18 is removed. Twelve tips at the tip are suppressed. As a result, it is possible to prevent the toner 18 deposited on the tip of the blade section 12 from returning to the image carrier 20 and to suppress a reduction in the recovery rate of the toner 18.
  • the thickness t2 of the intermediate portion between the distal end and the proximal end of the blade portion 12 is preferably 1.5 mm or more and less than 3.0 mm.
  • the thickness t2 of the intermediate portion is 1.5 mm or more, the elastic deformation of the blade portion 12 due to the thickness t2 of the intermediate portion can be suppressed small, and the influence of the thickness t2 on the stick-slip phenomenon can be suppressed.
  • the thickness t2 of the intermediate portion is more preferably 1.6 mm or more.
  • the thickness t2 of the intermediate portion is less than 3.0 mm, the size of the ridge 16 that increases with the thickness t2 can be suppressed, and the toner 18 can easily get over the ridge 16 when the toner 18 is scraped off. Therefore, it is possible to contribute to an improvement in the recovery rate of the toner 18.
  • the thickness t2 of the intermediate portion is more preferably equal to or less than 2.9 mm, and still more preferably equal to or less than 2.5 mm.
  • the thickness t2 of the middle portion is the thickness of the thinnest portion in the middle portion.
  • the difference t3-t2 between the thickness t3 at the position where the height of the ridge 16 is the maximum and the thickness t2 at the intermediate portion between the tip end and the base end of the blade portion 12 is 0.05 mm or more and less than 3.0 mm. Is preferred. When t3-t2 is 0.05 mm or more, the effect of suppressing the reversion of the toner 18 to the image carrier 20 is more excellent. In this respect, t3 ⁇ t2 is more preferably equal to or greater than 0.10 mm, and still more preferably equal to or greater than 0.50 mm.
  • t3 ⁇ t2 is 3.0 mm or less, the size of the ridge 16 is suppressed, and the toner 18 can easily get over the ridge 16 when the toner 18 is scraped off. Can contribute to improvement.
  • t3-t2 is more preferably equal to or less than 2.9 mm, and further preferably equal to or less than 2.5 mm.
  • the free length L of the blade portion 12 is preferably not less than 5.0 mm and not more than 12 mm. As shown in FIG. 2, the free length L is the length of a portion of the blade portion 12 that is not in contact with the holding portion 14 and that can be freely elastically deformed. If the free length L is not less than 5.0 mm, the portion that holds the toner 18 that has moved over the protruding ridge 16 and moved to the base end side of the protruding ridge 16 when scraping the toner 18 (the protrusion on the upper surface 12a of the blade portion 12). Since the volume of the concave portion formed from the ridge 16 to the base end can be increased, it is possible to contribute to an improvement in the recovery rate of the toner 18.
  • the free length L is more preferably equal to or greater than 6.0 mm.
  • the free length L is more preferably equal to or less than 12 mm.
  • the conveying distance of the toner 18 to the concave portion on the blade portion 12 is suppressed, and the effect of suppressing the return of the toner 18 to the image carrier 20 is more excellent.
  • the free length L is more preferably equal to or less than 10 mm.
  • the width S of the ridge 16 is preferably not more than ⁇ ⁇ ⁇ of the free length L.
  • the width S of the ridge 16 is equal to or less than ⁇ of the free length L, the distance for the toner 18 to move over the ridge 16 and move to the base end side than the ridge 16 when the toner 18 is scraped is short. Therefore, the toner 18 easily moves over the protrusion 16 toward the base end side from the protrusion 16, which can contribute to an improvement in the recovery rate of the toner 18.
  • the width S of the ridge 16 is more preferably 1/3 or less of the free length L.
  • the blade portion 12 of the blade 10 is made of a rubber elastic body.
  • the rubber elastic body urethane rubber, thermoplastic elastomer, or the like is suitably used.
  • the rubber elastic body is preferably a urethane rubber having excellent wear resistance and appropriate elasticity.
  • the JIS-A hardness of the blade portion 12 is preferably about 60 to 85 °. More preferably, it is 65 to 80 °.
  • a holder is disposed in a mold for a cleaning blade, and after the rubber composition is injected into the mold, the rubber composition is cured, and after the mold is released, cutting is performed as necessary. Can be produced.
  • the thickness t1 at the end on the distal end side of the ridge 16 is configured to be larger than the thickness t2 at the intermediate portion.
  • the thickness t1 is equal to one of the thickness t2. As long as the thickness is equal to or more than / 2, the thickness t1 may be the same as or smaller than the thickness t2.
  • FIG. 4 shows a cleaning blade for an electrophotographic apparatus according to another embodiment of the present invention.
  • the cleaning blade 30 has a blade portion 12 made of a rubber elastic material such as urethane rubber, and a holding portion 14 joined to a base end side of the blade portion 12.
  • the cleaning blade 30 is different from the cleaning blade 10 only in that the thickness t1 is configured to be smaller than the thickness t2, and the other configuration is the same as the cleaning blade 10, and therefore the description is omitted. I do.
  • the cleaning blade according to the present invention may be configured such that the thickness t1 is smaller than the thickness t2. However, if the thickness t1 is too small, the tip of the toner 18 is easily scraped when scraping, and the scraping of the toner 18 becomes insufficient and the recovery rate of the toner 18 is reduced. / 2 or more.
  • the ridge 16 is inclined so as to gradually increase from the distal end toward the proximal end, and the top of the ridge 16 has a smooth slope.
  • the top of the ridge 16 may be curved.
  • the highest position of the ridge 16 is the base end, but any position between the distal end and the base end may be the highest position of the ridge 16. Good.
  • the upper surface 12a and the lower surface 12b of the intermediate portion are flat, but a depression may be formed in one or both of the upper surface 12a and the lower surface 12b of the intermediate portion.
  • Examples 1 to 18, Comparative Examples 1 to 3 After placing the plate-like holder in the mold for the cleaning blade and injecting the urethane rubber composition into the mold, the urethane composition is heated to 130 ° C. to cure the urethane composition, and then removed from the mold and cut into predetermined shapes. Was produced.
  • the shape of each manufactured cleaning blade is as shown in the table with the values of the respective parameters in the model shape shown in FIG. Using each of the prepared cleaning blades, the toner recovery rate and occurrence of stick-slip were examined. The results are shown in the table.
  • ⁇ indicates that the mass of the collected toner was equal to Comparative Example 2 (from 1.01 to 1.1 times), Is good when the mass of the toner is larger than Comparative Example 2 (more than 1.1 times and 1.3 times or less), and particularly good when the mass of the collected toner is 1.35 times or more that of Comparative Example 2.
  • a cleaning blade is installed on a photosensitive drum (“HP LaserJet Enterprise Color M553dn” manufactured by HP of Japan) so that the scraped toner does not fall by its own weight, and is brought into contact with the photosensitive drum so that the contact pressure is constant.
  • the measurement terminal of the KEYENCE company NR-600 multi-input data acquisition system / NR-CA04 acceleration measurement unit
  • the photosensitive drum after 5000 sheets of images had been printed out.
  • the acceleration at one rotation was measured under an L / L environment (10 ° C. ⁇ 10% RH), and the measured acceleration was converted into vibration intensity, and the frequency around 350 Hz at which stick-slip was observed was observed.
  • the vibration intensity was measured.
  • a case where a resonance (squeal) having a fundamental vibration of 300 ⁇ 50 Hz was observed was marked as “x” with stick-slip, and a case where no resonance (squeak) with a fundamental vibration of 300 ⁇ 50 Hz was observed was observed without stick-slip “ ⁇ ”.
  • 300 ⁇ 50 Hz is not regarded as the fundamental vibration, but the case where resonance (squeal) is observed in the vicinity (200 Hz or more and less than 250 Hz, 350 Hz or more and 400 Hz or less) is indicated by “ ⁇ ”.
  • Comparative Example 1 having no ridge on the distal end side of the blade portion
  • Comparative Example 2 having a ridge on the distal end side of the blade portion, but having a position at which the height of the ridge is at the maximum at the distal end portion of the blade portion.
  • 3 has a ridge on the distal end side of the blade portion, and the position where the height of the ridge is maximum is the proximal end portion of the ridge and is closer to the proximal end than the distal end of the blade portion.
  • the thickness t1 at the distal end of the blade portion is equal to or more than ⁇ of the thickness t2 at the intermediate portion between the distal end and the proximal end of the blade portion, the stick-slip phenomenon is suppressed. At the same time, it can be seen that the toner recovery rate has been improved.
  • Examples 1 to 4 when the thickness t1 is equal to or more than the thickness t2 and the volume at the tip side ⁇ of the blade portion is larger, the influence on the stick-slip phenomenon is suppressed to a smaller extent. Further, from Examples 1, 5 to 8, when the thickness t2 is 1.5 mm or more, the influence on the stick-slip phenomenon is further suppressed, and when the thickness t2 is less than 3.0 mm, the toner recovery rate is reduced. Better. Further, from Examples 1 and 9 to 12, when the difference t3-t2 is 0.05 mm or more and 3.0 mm or less, the toner recovery rate is further improved.

Abstract

The present invention provides a cleaning blade for an electrophotographic device such that toner collection rate is improved while stick-slip is suppressed. A cleaning blade 10 for an electrophotographic device includes: a blade part 12 which is formed from an elastic rubber body, the tip end of the blade part being slid against the surface of an image carrier to clean the surface; and a holder part 14 bonded to the base end of the blade part 12. The blade part 12 has a projection 16 extending along the longitudinal direction of the blade part 12 at the edge of the surface 12a of the blade part 12 on the opposite side from the surface 12b facing the image carrier. The highest position of the projection 16 is closer to the base end of the blade part 12 than the tip end is; the thickness t1 of the tip end of the blade part 12 is greater than or equal to one half of the thickness t2 in the intermediate portion between the tip end and base end of the blade part 12.

Description

電子写真機器用クリーニングブレードCleaning blade for electrophotographic equipment
　本発明は、電子写真機器用クリーニングブレードに関するものである。 The present invention relates to a cleaning blade for an electrophotographic device.
　電子写真方式を採用する複写機、プリンター、ファクシミリなどの電子写真機器には、像担持体（感光ドラム，転写ベルト等）の外周面上に残留するトナーを除去するためのクリーニングブレードが設けられている。クリーニングブレードは、その先端で像担持体の外周面に当接しており、回転する像担持体の外周面上をその先端が当接して摺動することで、感光ドラムの外周面上に残留するトナーを除去している。 2. Description of the Related Art Electrophotographic devices such as copiers, printers, and facsimile machines that employ an electrophotographic system are provided with a cleaning blade for removing toner remaining on an outer peripheral surface of an image carrier (photosensitive drum, transfer belt, etc.). I have. The cleaning blade is in contact with the outer peripheral surface of the image carrier at its tip, and remains on the outer peripheral surface of the photosensitive drum by its tip contacting and sliding on the outer peripheral surface of the rotating image carrier. The toner has been removed.
特許第４４２９７１５号公報Japanese Patent No. 4429715 実公平０４－３４５３７号公報Japanese Utility Model Publication No. 04-34537
　クリーニングブレードは、例えば配置スペースなどから像担持体の上部に当接するように配置されることがある。この場合、クリーニングブレードの先端で掻き取られたトナーはその先端に堆積するため、トナーの堆積量が多くなるとその先端から像担持体へ逆戻りするおそれがある。 The cleaning blade may be arranged so as to contact the upper part of the image carrier from, for example, an arrangement space. In this case, the toner scraped off at the tip of the cleaning blade accumulates on the tip, so that if the amount of accumulated toner increases, the toner may return to the image carrier from the tip.
　例えば特許文献１には、長手方向の両端部の感光体ドラムに接する清掃側側端にトナー漏れ防止突部が形成されたクリーニングブレードが示されている。しかし、この突部は、いわゆるリング汚れ現象を防止するために、クリーニングブレードの長手方向の両端部から液状の余剰トナーが流れ出るのを防止するものである。この突部は、クリーニングブレードを乗り越えたトナーが感光体ドラムに逆戻りするのを防止するような形状にはなっていない。したがって、特許文献１のクリーニングブレードは、クリーニングブレードを乗り越えたトナーが感光体ドラムに逆戻りすることを防止するものではない。 For example, Patent Document 1 discloses a cleaning blade in which a toner leakage prevention protrusion is formed at a cleaning side end that contacts a photosensitive drum at both ends in a longitudinal direction. However, in order to prevent a so-called ring stain phenomenon, the protrusion prevents liquid excess toner from flowing out from both ends in the longitudinal direction of the cleaning blade. The projection is not shaped to prevent toner that has passed over the cleaning blade from returning to the photosensitive drum. Therefore, the cleaning blade of Patent Document 1 does not prevent the toner that has passed over the cleaning blade from returning to the photosensitive drum.
　また、特許文献２には、先端側のクリーニング部よりも長くかつ薄肉に形成されたアーム部を有するクリーニングブレードが示されている。しかし、このアーム部の形状は、ブレードの転写ドラムへの押し付け力を大とすることなくブレードの自由長を小さくすることを可能とするためのものである。特許文献２には、トナーがクリーニングブレードを乗り越えることの記載や、クリーニングブレードを乗り越えたトナーを回収することの記載はない。 Patent Literature 2 discloses a cleaning blade having an arm portion formed to be longer and thinner than the cleaning portion on the distal end side. However, the shape of the arm portion allows the free length of the blade to be reduced without increasing the pressing force of the blade against the transfer drum. Patent Literature 2 does not describe that the toner passes over the cleaning blade, and does not describe that the toner that has passed over the cleaning blade is collected.
　また、クリーニングブレードは、当接する像担持体の可動によって弾性変形を繰り返すため、振動によりスティックスリップ現象が発生するおそれがある。したがって、クリーニングブレードには、スティックスリップ現象を抑えつつトナーの回収率を向上することが求められる。 Further, since the cleaning blade repeatedly elastically deforms due to the movement of the image carrier that is in contact with the cleaning blade, the vibration may cause a stick-slip phenomenon. Therefore, the cleaning blade is required to improve the toner collection rate while suppressing the stick-slip phenomenon.
　本発明が解決しようとする課題は、スティックスリップ現象を抑えつつトナーの回収率を向上させた電子写真機器用クリーニングブレードを提供することにある。 A problem to be solved by the present invention is to provide a cleaning blade for an electrophotographic device in which the stick-slip phenomenon is suppressed and the toner recovery rate is improved.
　上記課題を解決するため本発明に係る電子写真機器用クリーニングブレードは、ゴム弾性体で構成され先端で像担持体の表面を摺擦して該表面を清掃するブレード部と、前記ブレード部の基端側に接合された保持部と、を有する電子写真機器用クリーニングブレードであって、前記ブレード部の像担持体に対向する面とは反対の面の先端側に、前記ブレード部の長手方向に沿って延びる突条を有し、前記突条における高さが最大となる位置が、前記ブレード部の先端側の端部よりも基端側にあり、前記ブレード部の先端側の端部における厚みｔ１が、前記ブレード部の先端と基端の間の中間部における厚みｔ２の１／２以上であることを要旨とするものである。 In order to solve the above-mentioned problems, a cleaning blade for an electrophotographic apparatus according to the present invention includes a blade portion which is made of a rubber elastic body and cleans the surface of the image carrier by rubbing the surface with the tip, and a base for the blade portion. A holding portion joined to the end side, and a cleaning blade for an electrophotographic apparatus, wherein the blade portion has a tip end side opposite to a surface facing the image carrier in a longitudinal direction of the blade portion. Has a ridge extending along the ridge, the position where the height of the ridge is the maximum is on the base end side than the end on the tip side of the blade portion, and the thickness at the end portion on the tip side of the blade portion The gist is that t1 is equal to or more than 厚 み of the thickness t2 at an intermediate portion between the distal end and the proximal end of the blade portion.
　本発明に係る電子写真機器用クリーニングブレードにおいては、前記ブレード部の先端側の端部における厚みｔ１が、前記ブレード部の先端と基端の間の中間部における厚みｔ２以上であることが好ましい。また、前記ブレード部の先端と基端の間の中間部における厚みｔ２が、１．５ｍｍ以上３．０ｍｍ未満であることが好ましい。また、前記突条における高さが最大となる位置における厚みｔ３と前記ブレード部の先端と基端の間の中間部における厚みｔ２の差ｔ３－ｔ２が、０．０５ｍｍ以上３．０ｍｍ以下であることが好ましい。また、前記ブレード部の自由長Ｌが、５．０ｍｍ以上１２ｍｍ以下であることが好ましい。また、前記突条の幅Ｓが、前記ブレード部の自由長Ｌの１／２以下であることが好ましい。 In the cleaning blade for an electrophotographic device according to the present invention, it is preferable that a thickness t1 at a distal end of the blade portion is not less than a thickness t2 at an intermediate portion between a distal end and a base end of the blade portion. Further, it is preferable that a thickness t2 at an intermediate portion between the distal end and the proximal end of the blade portion is 1.5 mm or more and less than 3.0 mm. The difference t3-t2 between the thickness t3 at the position where the height of the ridge is the maximum and the thickness t2 at the intermediate portion between the tip and the base of the blade portion is 0.05 mm or more and 3.0 mm or less. Is preferred. Further, it is preferable that the free length L of the blade portion is not less than 5.0 mm and not more than 12 mm. Further, it is preferable that the width S of the ridge is not more than の of the free length L of the blade portion.
　本発明に係る電子写真機器用クリーニングブレードによれば、ブレード部の像担持体に対向する面とは反対の面の先端側に、ブレード部の長手方向に沿って延びる突条を有し、突条における高さが最大となる位置が、ブレード部の先端側の端部よりも基端側にあることから、トナーの掻き取り時にはトナーが突条を乗り越えて突条よりも基端側に移動しやすく、基端側に移動したトナーは突条によって像担持体への逆戻りが抑えられるため、トナーの回収率を向上させることができる。そして、このような突条を有することで、ブレード部の基端側１／２よりも先端側１／２の体積が大きくなるため、ブレード部の弾性変形を小さくすることができ、スティックスリップ現象を抑えることができる。また、突条における高さが最大となる位置がブレード部の先端側の端部よりも基端側にあることで、突条における重心が基端側に寄っており、スティックスリップ現象の抑制に貢献する。さらに、ブレード部の先端側の端部における厚みｔ１がブレード部の先端と基端の間の中間部における厚みｔ２の１／２以上であることで、トナーの掻き取り時におけるブレード部の先端のメクレが抑えられる。これにより、ブレード部の先端に堆積するトナーが像担持体へ逆戻りするのを抑え、トナーの回収率の低下を抑えることができる。 According to the cleaning blade for an electrophotographic apparatus according to the present invention, the protruding ridge extending along the longitudinal direction of the blade portion is provided on the tip end side of the surface of the blade portion opposite to the surface facing the image carrier. The position where the height of the ridge is the maximum is closer to the proximal end than the distal end of the blade, so that when the toner is scraped, the toner moves over the ridge and moves to the proximal end than the ridge. Since the toner that has moved to the base end side is prevented from returning to the image carrier by the ridge, the toner recovery rate can be improved. The presence of such a ridge increases the volume of the blade portion at the distal end 先端 than at the base end １ ／, so that the elastic deformation of the blade portion can be reduced and the stick-slip phenomenon occurs. Can be suppressed. In addition, since the position where the height of the ridge is maximum is closer to the base end than the end of the blade portion on the front end side, the center of gravity of the ridge is closer to the base end, and the stick-slip phenomenon is suppressed. To contribute. Further, since the thickness t1 at the distal end of the blade portion is equal to or more than の of the thickness t2 at the intermediate portion between the distal end and the base end of the blade portion, the tip of the blade portion at the time of scraping off the toner is removed. Squeak is reduced. Thereby, it is possible to suppress the toner accumulated on the tip of the blade portion from returning to the image carrier, and to suppress a decrease in the toner recovery rate.
　この際、ブレード部の先端側の端部における厚みｔ１が、ブレード部の先端と基端の間の中間部における厚みｔ２以上であると、ブレード部の先端側１／２の体積をより大きくできるため、ブレード部の弾性変形を小さくする効果が向上し、スティックスリップ現象を抑える効果が向上する。 At this time, if the thickness t1 at the distal end of the blade portion is equal to or greater than the thickness t2 at the intermediate portion between the distal end and the base end of the blade portion, the volume of the distal half of the blade portion can be increased. Therefore, the effect of reducing the elastic deformation of the blade portion is improved, and the effect of suppressing the stick-slip phenomenon is improved.
　そして、ブレード部の先端と基端の間の中間部における厚みｔ２が１．５ｍｍ以上であると、厚みｔ２によるスティックスリップ現象への影響を小さく抑えることができる。また、厚みｔ２が３．０ｍｍ未満であると、厚みｔ２に伴い大きくなる突条の大きさを抑えてトナーの掻き取り時にトナーが突条を乗り越えやすくすることができるため、トナーの回収率向上に貢献できる。 と If the thickness t2 at the intermediate portion between the distal end and the proximal end of the blade portion is 1.5 mm or more, the influence of the thickness t2 on the stick-slip phenomenon can be suppressed to a small value. Further, when the thickness t2 is less than 3.0 mm, the size of the ridge, which increases with the thickness t2, can be suppressed, and the toner can easily get over the ridge at the time of scraping the toner. Can contribute to
　そして、突条における高さが最大となる位置における厚みｔ３とブレード部の先端と基端の間の中間部における厚みｔ２の差ｔ３－ｔ２が０．０５ｍｍ以上であると、像担持体へのトナーの逆戻りを抑える効果により優れる。また、ｔ３－ｔ２が３．０ｍｍ以下であると、突条の大きさが抑えられ、トナーの掻き取り時にトナーが突条を乗り越えやすくすることができるため、トナーの回収率向上に貢献できる。 If the difference t3-t2 between the thickness t3 at the position where the height of the ridge is the maximum and the thickness t2 at the intermediate portion between the leading end and the base end of the blade portion is 0.05 mm or more, the transfer to the image bearing member is performed. Excellent due to the effect of suppressing toner reversion. When t3-t2 is 3.0 mm or less, the size of the ridge is suppressed, and the toner can easily get over the ridge during scraping of the toner, thereby contributing to an improvement in the toner recovery rate.
　そして、ブレード部の自由長Ｌが５．０ｍｍ以上であると、トナーの掻き取り時に突条を乗り越えて突条よりも基端側に移動したトナーを保持する部分の容積を大きくできるため、トナーの回収率向上に貢献できる。また、自由長Ｌが１２ｍｍ以下であると、ブレード部上でのトナーの搬送距離が抑えられ、像担持体へのトナーの逆戻りを抑える効果により優れる。 If the free length L of the blade portion is not less than 5.0 mm, the volume of the portion that holds the toner that has moved over the protrusion and moved to the base end side of the protrusion when scraping the toner can be increased. Can contribute to the improvement of the recovery rate. Further, when the free length L is 12 mm or less, the conveyance distance of the toner on the blade portion is suppressed, and the effect of suppressing the return of the toner to the image carrier is more excellent.
　そして、突条の幅Ｓが自由長Ｌの１／２以下であると、トナーの掻き取り時にトナーが突条を乗り越えて突条よりも基端側に移動するための距離が短いため、トナーが突条を乗り越えて突条よりも基端側に移動しやすく、トナーの回収率向上に貢献できる。 If the width S of the ridge is not more than の of the free length L, the distance for the toner to move over the ridge and move to the base end side of the ridge when scraping the toner is short. Can easily move to the base end side of the ridge over the ridge, which can contribute to an improvement in the toner recovery rate.
本発明の一実施形態に係る電子写真機器用クリーニングブレードの斜視図である。1 is a perspective view of a cleaning blade for an electrophotographic device according to an embodiment of the present invention. 本発明の一実施形態に係る電子写真機器用クリーニングブレードの側面図である。1 is a side view of a cleaning blade for an electrophotographic device according to an embodiment of the present invention. 本発明の一実施形態に係る電子写真機器用クリーニングブレードが回転する像担持体の外周面上を摺動する様子を示した模式図である。FIG. 3 is a schematic diagram illustrating a state in which a cleaning blade for an electrophotographic device according to an embodiment of the present invention slides on an outer peripheral surface of a rotating image carrier. 他の実施形態に係る電子写真機器用クリーニングブレードの側面図である。FIG. 10 is a side view of a cleaning blade for an electrophotographic device according to another embodiment.
　以下、本発明の実施形態について図面を用いて詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
　図１に示すように、本発明の一実施形態に係る電子写真機器用クリーニングブレード（本ブレード）１０は、ウレタンゴムなどのゴム弾性体で構成されたブレード部１２と、ブレード部１２の基端側に接合された保持部１４と、を有する。保持部１４は、金属や硬質プラスチックなどの剛性部材で構成され、断面Ｌ字状となっている。本ブレード１０において、ｘ方向がブレード部１２の長手方向であり、ｙ方向がブレード部１２の幅方向である。本ブレード１０は、ブレード部１２の長手方向（ｘ方向）が像担持体（感光ドラム，転写ベルト等）の軸方向と平行になるように像担持体に対して配置される。 As shown in FIG. 1, a cleaning blade (main blade) 10 for an electrophotographic apparatus according to one embodiment of the present invention includes a blade portion 12 made of a rubber elastic body such as urethane rubber, and a base end of the blade portion 12. Holding part 14 joined to the side. The holding section 14 is made of a rigid member such as metal or hard plastic, and has an L-shaped cross section. In the present blade 10, the x direction is the longitudinal direction of the blade portion 12, and the y direction is the width direction of the blade portion 12. The blade 10 is arranged on the image carrier such that the longitudinal direction (x direction) of the blade section 12 is parallel to the axial direction of the image carrier (photosensitive drum, transfer belt, etc.).
　図２に示すように、本ブレード１０は、ブレード部１２の下面１２ｂが像担持体に対向する面となり、この像担持体に対向する面の先端側端部に、像担持体の表面に当接する当接部（エッジ）１２ｃを有する。そして、ブレード部１２の像担持体に対向する面とは反対の面（上面１２ａ）の先端側には、ブレード部１２の長手方向（ｘ方向）に沿って延びる突条１６を有している。この突条１６は、ブレード部１２の上面１２ａに対し、直交する方向の上側に設けられている。ブレード部１２の先端と基端の間の中間部において、ブレード部１２の上面１２ａおよび下面１２ｂは互いに平行な平面となっており、この中間部は平板状に形成されている。中間部は、ブレード部１２における先端側の突条を有する部分と基端側の保持部に接合されている部分を除いた部分であり、基端側の保持部に接合されている部分から先端側の突条を有する部分まで延びるアームとなる部分である。ブレード部１２の当接部１２ｃにおけるエッジの角度θ１は略９０°であり、好適には８０°～１００°の範囲である。また、ブレード部１２の上面１２ａと突条１６の基端側端面のなす角θ２は、略９０°であり、好適には８０°～１００°の範囲である。 As shown in FIG. 2, in the blade 10, the lower surface 12b of the blade portion 12 is a surface facing the image carrier, and the front end of the surface facing the image carrier is in contact with the surface of the image carrier. It has an abutting portion (edge) 12c to be in contact with. Further, a protrusion 16 extending along the longitudinal direction (x direction) of the blade portion 12 is provided on the distal end side of the surface (upper surface 12a) of the blade portion 12 opposite to the surface facing the image carrier. . The ridge 16 is provided above the upper surface 12a of the blade portion 12 in a direction orthogonal to the upper surface 12a. In an intermediate portion between the distal end and the proximal end of the blade portion 12, the upper surface 12a and the lower surface 12b of the blade portion 12 are planes parallel to each other, and the intermediate portion is formed in a flat plate shape. The intermediate portion is a portion excluding a portion of the blade portion 12 having a distal-side ridge and a portion joined to the base-side holding portion. It is a portion that becomes an arm extending to a portion having a side ridge. Abutment angle theta 1 of the edge in 12c of the blade portion 12 is substantially 90 °, preferably in the range of 80 ° ~ 100 °. Further, the angle theta 2 of the proximal end face of the top surface 12a and ridges 16 of the blade portion 12 is substantially 90 °, preferably in the range of 80 ° ~ 100 °.
　ブレード部１２の先端側端部は、突条１６の先端側端部と面一となっている。突条１６の先端側端部は、中間部の上面１２ａよりも高い位置にあり、突条１６の先端側端部における厚みｔ１は、中間部における厚みｔ２よりも大きくなっている（ｔ１＞ｔ２）。そして、突条１６は先端側の端部から基端側に向けて漸次高くなるように傾斜しており、突条１６の頂部は平滑な斜面となっている。したがって、突条１６の基端側の端部が突条１６における高さが最大となる位置であり、突条１６における高さが最大となる位置は、ブレード部１２の先端側の端部よりも基端側にある。そして、突条１６における高さが最大となる位置である、突条１６の基端側端部における厚みｔ３は、突条１６の先端側端部（ブレード部１２の先端側端部）における厚みｔ１よりも大きく（ｔ３＞ｔ１）、中間部における厚みｔ２よりも大きくなっている（ｔ３＞ｔ２）。 先端 The tip end of the blade portion 12 is flush with the tip end of the ridge 16. The distal end of the ridge 16 is higher than the upper surface 12a of the intermediate portion, and the thickness t1 at the distal end of the ridge 16 is larger than the thickness t2 of the intermediate portion (t1> t2). ). The ridge 16 is inclined so as to gradually increase from the end on the distal side toward the base end, and the top of the ridge 16 is a smooth slope. Therefore, the base end of the ridge 16 is the position where the height of the ridge 16 is the maximum, and the position where the height of the ridge 16 is the maximum is the end of the blade 12 that is closer to the tip. Is also on the proximal side. The thickness t3 at the base end of the ridge 16, which is the position where the height of the ridge 16 is the maximum, is the thickness at the tip end of the ridge 16 (the tip end of the blade portion 12). It is larger than t1 (t3> t1) and larger than the thickness t2 in the middle part (t3> t2).
　このような構成の本ブレード１０は、図３に示すように、像担持体２０の上部に、ブレード部１２の上面１２ａを上にして、像担持体２０の上部に当接部１２ｃが当接するように設置される。像担持体２０の回転に伴い、当接部１２ｃで像担持体２０の表面を摺擦して、像担持体２０の表面に残留するトナー１８を掻き取って像担持体２０の表面を清掃する。当接部１２ｃで掻き取られたトナー１８は、ブレード部１２の先端に徐々に堆積し、次第にブレード部１２の先端の突条１６を乗り越え、ブレード部１２の上面１２ａにおける突条１６から基端までで形成される凹部まで移動し、凹部に収容される。こうして、掻き取られたトナー１８を凹部に溜めることで、トナー１８は回収される。 As shown in FIG. 3, in the blade 10 having such a configuration, the contact portion 12c contacts the upper portion of the image carrier 20 with the upper surface 12a of the blade portion 12 facing upward. Is installed as follows. As the image carrier 20 rotates, the surface of the image carrier 20 is rubbed by the contact portion 12c to scrape off the toner 18 remaining on the surface of the image carrier 20 and clean the surface of the image carrier 20. . The toner 18 scraped off by the contact portion 12c gradually accumulates at the tip of the blade portion 12, gradually climbs over the ridge 16 at the tip of the blade portion 12, and from the ridge 16 on the upper surface 12a of the blade portion 12 to the base end. Is moved to the recess formed up to and accommodated in the recess. The toner 18 thus collected is collected in the recess by collecting the scraped toner 18.
　本ブレード１０において、突条１６は先端側の端部から基端側に向けて漸次高くなるように傾斜しており、突条１６の基端側端部における厚みｔ３が突条１６の先端側端部における厚みｔ１よりも大きく（ｔ３＞ｔ１）、突条１６における高さが最大となる位置がブレード部１２の先端側の端部よりも基端側にあることから、トナー１８の掻き取り時にはトナー１８が突条１６を乗り越えて突条１６よりも基端側に移動しやすく、基端側に移動したトナーは突条１６によって像担持体２０への逆戻りが抑えられるため、トナー１８の回収率を向上させることができる。 In the present blade 10, the ridge 16 is inclined so as to gradually increase from the distal end toward the proximal end, and the thickness t3 at the proximal end of the ridge 16 is closer to the distal end of the ridge 16. Since the position where the thickness is larger than the thickness t1 at the end (t3> t1) and the height of the ridge 16 is the maximum is on the base end side of the end of the blade portion 12 on the front end side, the toner 18 is scraped off. At times, the toner 18 easily moves over the ridges 16 and moves toward the base end side from the ridges 16, and the toner moved to the base end side is prevented from returning to the image carrier 20 by the ridges 16. Recovery rate can be improved.
　そして、このような突条１６を有することで、ブレード部１２の基端側１／２よりも先端側１／２の体積が大きくなるため、ブレード部１２の弾性変形を小さくすることができ、スティックスリップ現象を抑えることができる。また、突条１６は先端側の端部から基端側に向けて漸次高くなるように傾斜しており、突条１６における高さが最大となる位置がブレード部１２の先端側の端部よりも基端側にあることで、突条１６における重心が基端側に寄っており、スティックスリップ現象の抑制に貢献する。 And by having such a ridge 16, since the volume of the tip side 1/2 is larger than the base side 1/2 of the blade part 12, the elastic deformation of the blade part 12 can be reduced, The stick-slip phenomenon can be suppressed. The ridge 16 is inclined so as to gradually increase from the distal end toward the proximal end, and the position where the height of the ridge 16 is maximum is higher than the distal end of the blade portion 12. Is also on the base end side, the center of gravity of the ridge 16 is closer to the base end side, and contributes to suppression of the stick-slip phenomenon.
　さらに、ブレード部１２の先端側の端部における厚みｔ１がブレード部１２の先端と基端の間の中間部における厚みｔ２の１／２以上であることで、トナー１８の掻き取り時におけるブレード部１２の先端のメクレが抑えられる。これにより、ブレード部１２の先端に堆積するトナー１８が像担持体２０へ逆戻りするのを抑え、トナー１８の回収率の低下を抑えることができる。 Further, since the thickness t1 at the distal end of the blade portion 12 is equal to or more than １ ／ of the thickness t2 at the intermediate portion between the distal end and the base end of the blade portion 12, the blade portion at the time of scraping the toner 18 is removed. Twelve tips at the tip are suppressed. As a result, it is possible to prevent the toner 18 deposited on the tip of the blade section 12 from returning to the image carrier 20 and to suppress a reduction in the recovery rate of the toner 18.
　本ブレード１０においては、ブレード部１２の先端と基端の間の中間部の厚みｔ２は、１．５ｍｍ以上３．０ｍｍ未満であることが好ましい。中間部の厚みｔ２が１．５ｍｍ以上であると、中間部の厚みｔ２に起因するブレード部１２の弾性変形が小さく抑えられ、厚みｔ２によるスティックスリップ現象への影響を小さく抑えることができる。この観点から、中間部の厚みｔ２は、より好ましくは１．６ｍｍ以上である。そして、中間部の厚みｔ２が３．０ｍｍ未満であると、厚みｔ２に伴い大きくなる突条１６の大きさを抑えてトナー１８の掻き取り時にトナー１８が突条１６を乗り越えやすくすることができるため、トナー１８の回収率向上に貢献できる。この観点から、中間部の厚みｔ２は、より好ましくは２．９ｍｍ以下、さらに好ましくは２．５ｍｍ以下である。中間部の厚みが不均一である場合には、中間部の厚みｔ２は中間部において最も厚みの薄い部分における厚みである。 に お い て In the present blade 10, the thickness t2 of the intermediate portion between the distal end and the proximal end of the blade portion 12 is preferably 1.5 mm or more and less than 3.0 mm. When the thickness t2 of the intermediate portion is 1.5 mm or more, the elastic deformation of the blade portion 12 due to the thickness t2 of the intermediate portion can be suppressed small, and the influence of the thickness t2 on the stick-slip phenomenon can be suppressed. In this respect, the thickness t2 of the intermediate portion is more preferably 1.6 mm or more. When the thickness t2 of the intermediate portion is less than 3.0 mm, the size of the ridge 16 that increases with the thickness t2 can be suppressed, and the toner 18 can easily get over the ridge 16 when the toner 18 is scraped off. Therefore, it is possible to contribute to an improvement in the recovery rate of the toner 18. In this respect, the thickness t2 of the intermediate portion is more preferably equal to or less than 2.9 mm, and still more preferably equal to or less than 2.5 mm. When the thickness of the middle portion is not uniform, the thickness t2 of the middle portion is the thickness of the thinnest portion in the middle portion.
　そして、突条１６における高さが最大となる位置における厚みｔ３とブレード部１２の先端と基端の間の中間部における厚みｔ２の差ｔ３－ｔ２は、０．０５ｍｍ以上３．０ｍｍ未満であることが好ましい。ｔ３－ｔ２が０．０５ｍｍ以上であると、像担持体２０へのトナー１８の逆戻りを抑える効果により優れる。この観点から、ｔ３－ｔ２は、より好ましくは０．１０ｍｍ以上、さらに好ましくは０．５０ｍｍ以上である。また、ｔ３－ｔ２が３．０ｍｍ以下であると、突条１６の大きさが抑えられ、トナー１８の掻き取り時にトナー１８が突条１６を乗り越えやすくすることができるため、トナー１８の回収率向上に貢献できる。この観点から、ｔ３－ｔ２は、より好ましくは２．９ｍｍ以下、さらに好ましくは２．５ｍｍ以下である。 The difference t3-t2 between the thickness t3 at the position where the height of the ridge 16 is the maximum and the thickness t2 at the intermediate portion between the tip end and the base end of the blade portion 12 is 0.05 mm or more and less than 3.0 mm. Is preferred. When t3-t2 is 0.05 mm or more, the effect of suppressing the reversion of the toner 18 to the image carrier 20 is more excellent. In this respect, t3−t2 is more preferably equal to or greater than 0.10 mm, and still more preferably equal to or greater than 0.50 mm. When t3−t2 is 3.0 mm or less, the size of the ridge 16 is suppressed, and the toner 18 can easily get over the ridge 16 when the toner 18 is scraped off. Can contribute to improvement. In this respect, t3-t2 is more preferably equal to or less than 2.9 mm, and further preferably equal to or less than 2.5 mm.
　そして、ブレード部１２の自由長Ｌは、５．０ｍｍ以上１２ｍｍ以下であることが好ましい。自由長Ｌは、図２に示すように、ブレード部１２のうち保持部１４と接触していない部分で自由に弾性変形可能な部分の長さである。自由長Ｌが５．０ｍｍ以上であると、トナー１８の掻き取り時に突条１６を乗り越えて突条１６よりも基端側に移動したトナー１８を保持する部分（ブレード部１２の上面１２ａにおける突条１６から基端までで形成される凹部）の容積を大きくできるため、トナー１８の回収率向上に貢献できる。この観点から、自由長Ｌは、より好ましくは６．０ｍｍ以上である。そして、自由長Ｌが１２ｍｍ以下であると、ブレード部１２上においてトナー１８の凹部への搬送距離が抑えられ、像担持体２０へのトナー１８の逆戻りを抑える効果により優れる。この観点から、自由長Ｌは、より好ましくは１０ｍｍ以下である。 自由 The free length L of the blade portion 12 is preferably not less than 5.0 mm and not more than 12 mm. As shown in FIG. 2, the free length L is the length of a portion of the blade portion 12 that is not in contact with the holding portion 14 and that can be freely elastically deformed. If the free length L is not less than 5.0 mm, the portion that holds the toner 18 that has moved over the protruding ridge 16 and moved to the base end side of the protruding ridge 16 when scraping the toner 18 (the protrusion on the upper surface 12a of the blade portion 12). Since the volume of the concave portion formed from the ridge 16 to the base end can be increased, it is possible to contribute to an improvement in the recovery rate of the toner 18. In this respect, the free length L is more preferably equal to or greater than 6.0 mm. When the free length L is equal to or less than 12 mm, the conveying distance of the toner 18 to the concave portion on the blade portion 12 is suppressed, and the effect of suppressing the return of the toner 18 to the image carrier 20 is more excellent. In this respect, the free length L is more preferably equal to or less than 10 mm.
　そして、突条１６の幅Ｓは、自由長Ｌに対し、１／２以下であることが好ましい。突条１６の幅Ｓが自由長Ｌの１／２以下であると、トナー１８の掻き取り時にトナー１８が突条１６を乗り越えて突条１６よりも基端側に移動するための距離が短いため、トナー１８が突条１６を乗り越えて突条１６よりも基端側に移動しやすく、トナー１８の回収率向上に貢献できる。この観点から、突条１６の幅Ｓは、自由長Ｌに対し、より好ましくは１／３以下である。 幅 The width S of the ridge 16 is preferably not more than に 対 し of the free length L. When the width S of the ridge 16 is equal to or less than 自由 of the free length L, the distance for the toner 18 to move over the ridge 16 and move to the base end side than the ridge 16 when the toner 18 is scraped is short. Therefore, the toner 18 easily moves over the protrusion 16 toward the base end side from the protrusion 16, which can contribute to an improvement in the recovery rate of the toner 18. From this viewpoint, the width S of the ridge 16 is more preferably 1/3 or less of the free length L.
　本ブレード１０のブレード部１２は、ゴム弾性体からなり、ゴム弾性体としては、ウレタンゴム、熱可塑性エラストマーなどが好適に用いられる。ゴム弾性体としては、好ましくは、耐摩耗性に優れ、かつ、適度な弾性を有するウレタンゴムである。ブレード部１２のＪＩＳ－Ａ硬度は、６０～８５°程度であることが好ましい。より好ましくは６５～８０°である。 ブ レ ー ド The blade portion 12 of the blade 10 is made of a rubber elastic body. As the rubber elastic body, urethane rubber, thermoplastic elastomer, or the like is suitably used. The rubber elastic body is preferably a urethane rubber having excellent wear resistance and appropriate elasticity. The JIS-A hardness of the blade portion 12 is preferably about 60 to 85 °. More preferably, it is 65 to 80 °.
　本ブレード１０は、クリーニングブレード用成形型内に、保持具を配置し、ゴム組成物を成形型内に注入した後、ゴム組成物を硬化し、脱型後、必要に応じて裁断などすることにより、作製することができる。 In the present blade 10, a holder is disposed in a mold for a cleaning blade, and after the rubber composition is injected into the mold, the rubber composition is cured, and after the mold is released, cutting is performed as necessary. Can be produced.
　以上、本発明の実施形態について詳細に説明したが、本発明は上記実施形態に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の改変が可能である。 Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.
　例えば上記実施形態においては、突条１６の先端側の端部における厚みｔ１が中間部の厚みｔ２よりも大きく構成されているが、本発明に係るクリーニングブレードにおいては、厚みｔ１が厚みｔ２の１／２以上であれば、厚みｔ１が厚みｔ２と同じか厚みｔ２よりも小さく構成されていてもよい。図４には、本発明の他の実施形態に係る電子写真機器用クリーニングブレードを示す。 For example, in the above-described embodiment, the thickness t1 at the end on the distal end side of the ridge 16 is configured to be larger than the thickness t2 at the intermediate portion. However, in the cleaning blade according to the present invention, the thickness t1 is equal to one of the thickness t2. As long as the thickness is equal to or more than / 2, the thickness t1 may be the same as or smaller than the thickness t2. FIG. 4 shows a cleaning blade for an electrophotographic apparatus according to another embodiment of the present invention.
　図４に示すように、クリーニングブレード３０は、ウレタンゴムなどのゴム弾性体で構成されたブレード部１２と、ブレード部１２の基端側に接合された保持部１４と、を有する。クリーニングブレード３０は、クリーニングブレード１０と比較して、厚みｔ１が厚みｔ２よりも小さく構成されている点が相違するのみであり、これ以外の構成はクリーニングブレード１０と同じであるため、説明を省略する。 As shown in FIG. 4, the cleaning blade 30 has a blade portion 12 made of a rubber elastic material such as urethane rubber, and a holding portion 14 joined to a base end side of the blade portion 12. The cleaning blade 30 is different from the cleaning blade 10 only in that the thickness t1 is configured to be smaller than the thickness t2, and the other configuration is the same as the cleaning blade 10, and therefore the description is omitted. I do.
　このように、本発明に係るクリーニングブレードは、厚みｔ１が厚みｔ２よりも小さく構成されていてもよい。ただし、厚みｔ１が薄すぎると、トナー１８の掻き取り時に先端においてメクレが生じやすく、トナー１８の掻き取りが不十分となってトナー１８の回収率が低下するため、厚みｔ１は厚みｔ２の１／２以上とする必要がある。 Thus, the cleaning blade according to the present invention may be configured such that the thickness t1 is smaller than the thickness t2. However, if the thickness t1 is too small, the tip of the toner 18 is easily scraped when scraping, and the scraping of the toner 18 becomes insufficient and the recovery rate of the toner 18 is reduced. / 2 or more.
　また、上記実施形態においては、突条１６は先端側の端部から基端側に向けて漸次高くなるように傾斜しており、突条１６の頂部は平滑な斜面となっているが、突条１６の頂部は曲面であってもよい。また、突条１６における最も高い位置は基端側端部となっているが、先端側端部と基端側端部の間の任意の位置が突条１６における最も高い位置となっていてもよい。 Further, in the above embodiment, the ridge 16 is inclined so as to gradually increase from the distal end toward the proximal end, and the top of the ridge 16 has a smooth slope. The top of the ridge 16 may be curved. The highest position of the ridge 16 is the base end, but any position between the distal end and the base end may be the highest position of the ridge 16. Good.
　また、上記実施形態においては、中間部の上面１２ａおよび下面１２ｂは平面となっているが、中間部の上面１２ａおよび下面１２ｂのいずれか一方または両方に、窪みが形成されていてもよい。 Also, in the above embodiment, the upper surface 12a and the lower surface 12b of the intermediate portion are flat, but a depression may be formed in one or both of the upper surface 12a and the lower surface 12b of the intermediate portion.
　以下、実施例を用いて本発明を詳細に説明するが、本発明はこの構成に限定されるものではない。 Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to this configuration.
（実施例１～１８、比較例１～３）
　クリーニングブレード用成形型内に板状保持具を配置し、ウレタンゴム組成物を成形型内に注入した後、１３０℃に加熱してウレタン組成物を硬化させ、脱型、裁断することにより、所定の形状を有するクリーニングブレードを作製した。作製した各クリーニングブレードの形状は、図２に示すモデル形状における各パラメータの値が表に示す通りのものである。作製した各クリーニングブレードを用い、トナー回収率とスティックスリップの発生を調べた。その結果を表に示す。 (Examples 1 to 18, Comparative Examples 1 to 3)
After placing the plate-like holder in the mold for the cleaning blade and injecting the urethane rubber composition into the mold, the urethane composition is heated to 130 ° C. to cure the urethane composition, and then removed from the mold and cut into predetermined shapes. Was produced. The shape of each manufactured cleaning blade is as shown in the table with the values of the respective parameters in the model shape shown in FIG. Using each of the prepared cleaning blades, the toner recovery rate and occurrence of stick-slip were examined. The results are shown in the table.
（トナー回収率の測定）
　予め各クリーニングブレードの質量を測定した後、感光ドラムを簡易的に回転できる治具を取り付けた感光ドラム（日本ＨＰ社製、「ＨＰ　ＬａｓｅｒＪｅｔ　Ｅｎｔｅｒｐｒｉｓｅ　Ｃｏｌｏｒ　Ｍ５５３ｄｎ」に、かき取ったトナーが自重で落ちないようにクリーニングブレードを設置し、感光ドラムに対し当接圧が一定となるように当接させた。次いで、感光ドラムにトナーを一定に供給しつつランニング試験を行った（感光ドラムを１万回転させた）。その後、クリーニングブレードを取り出し、そのクリーニングブレードの質量を測定することで、クリーニングブレード上に堆積する回収トナーの質量を算出した。
　ブレード部の先端側に突条を有しない比較例１を基準とし、回収トナーの質量が比較例２と同等（１.０１倍以上１．１倍以下）だった場合を「△」、回収トナーの質量が比較例２よりも大きい（１．１倍超１．３倍以下）場合を良好「○」、回収トナーの質量が比較例２の１．３５倍以上の場合を特に良好「◎」、回収トナーの質量が比較例２よりも小さい（１.０倍未満）場合を不良「×」とした。 (Measurement of toner recovery rate)
After measuring the mass of each cleaning blade in advance, the toner scraped by a self-weight does not fall on a photosensitive drum (“HP LaserJet Enterprise Color M553dn” manufactured by HP Japan, Ltd.) equipped with a jig that can easily rotate the photosensitive drum. Then, a running test was performed while the toner was supplied to the photosensitive drum at a constant rate (10,000 rotations of the photosensitive drum). Thereafter, the cleaning blade was taken out, and the mass of the cleaning blade was measured to calculate the mass of the collected toner deposited on the cleaning blade.
Based on Comparative Example 1 having no ridge on the tip end side of the blade portion, "△" indicates that the mass of the collected toner was equal to Comparative Example 2 (from 1.01 to 1.1 times), Is good when the mass of the toner is larger than Comparative Example 2 (more than 1.1 times and 1.3 times or less), and particularly good when the mass of the collected toner is 1.35 times or more that of Comparative Example 2. The case where the mass of the collected toner was smaller than that of Comparative Example 2 (less than 1.0 times) was evaluated as “poor”.
（スティックスリップの発生）
　感光ドラム（日本ＨＰ社製、「ＨＰ　ＬａｓｅｒＪｅｔ　Ｅｎｔｅｒｐｒｉｓｅ　Ｃｏｌｏｒ　Ｍ５５３ｄｎ」に、かき取ったトナーが自重で落ちないようにクリーニングブレードを設置し、感光ドラムに対し当接圧が一定となるように当接させた。次いで、ＫＥＹＥＮＣＥ社製（ＮＲ－６００　マルチ入力データ収集システム／ＮＲ－ＣＡ０４　加速度計測ユニット）の測定端子を保持部１４の中央にアロンアルファにて固定し、５０００枚画出し後の感光ドラムをさらに１回転させたときの加速度をＬ／Ｌ環境下（１０℃×１０％ＲＨ）で計測した。計測した加速度は、振動強度へ変換し、スティックスリップの発生が確認されている周波数３５０Ｈｚ付近の振動強度を計測した。
　３００±５０Ｈｚを基本振動とする共振（鳴き）を観測した場合をスティックスリップあり「×」とし、３００±５０Ｈｚを基本振動とする共振（鳴き）を観測しなかった場合をスティックスリップなし「○」とした。また、３００±５０Ｈｚを基本振動とはしないがその付近（２００Ｈｚ以上２５０Ｈｚ未満、３５０Ｈｚ超４００Ｈｚ以下）で共振（鳴き）を観測した場合を「△」とした。 (Stick slip occurs)
A cleaning blade is installed on a photosensitive drum (“HP LaserJet Enterprise Color M553dn” manufactured by HP of Japan) so that the scraped toner does not fall by its own weight, and is brought into contact with the photosensitive drum so that the contact pressure is constant. Next, the measurement terminal of the KEYENCE company (NR-600 multi-input data acquisition system / NR-CA04 acceleration measurement unit) was fixed to the center of the holding unit 14 with Aron Alpha, and the photosensitive drum after 5000 sheets of images had been printed out. Further, the acceleration at one rotation was measured under an L / L environment (10 ° C. × 10% RH), and the measured acceleration was converted into vibration intensity, and the frequency around 350 Hz at which stick-slip was observed was observed. The vibration intensity was measured.
A case where a resonance (squeal) having a fundamental vibration of 300 ± 50 Hz was observed was marked as “x” with stick-slip, and a case where no resonance (squeak) with a fundamental vibration of 300 ± 50 Hz was observed was observed without stick-slip “「 ”. And In addition, 300 ± 50 Hz is not regarded as the fundamental vibration, but the case where resonance (squeal) is observed in the vicinity (200 Hz or more and less than 250 Hz, 350 Hz or more and 400 Hz or less) is indicated by “△”.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
　ブレード部の先端側に突条を有しない比較例１、ブレード部の先端側に突条を有するものの突条における高さが最大となる位置がブレード部の先端側の端部にある比較例２，３に対し、ブレード部の先端側に突条を有し、突条における高さが最大となる位置が突条の基端側端部でブレード部の先端側の端部よりも基端側にあり、ブレード部の先端側の端部における厚みｔ１がブレード部の先端と基端の間の中間部における厚みｔ２の１／２以上である各実施例は、スティックスリップ現象が抑えられているとともに、トナーの回収率が向上していることがわかる。 Comparative Example 1 having no ridge on the distal end side of the blade portion, Comparative Example 2 having a ridge on the distal end side of the blade portion, but having a position at which the height of the ridge is at the maximum at the distal end portion of the blade portion. , 3 has a ridge on the distal end side of the blade portion, and the position where the height of the ridge is maximum is the proximal end portion of the ridge and is closer to the proximal end than the distal end of the blade portion. In each of the embodiments in which the thickness t1 at the distal end of the blade portion is equal to or more than の of the thickness t2 at the intermediate portion between the distal end and the proximal end of the blade portion, the stick-slip phenomenon is suppressed. At the same time, it can be seen that the toner recovery rate has been improved.
　そして、実施例１～４から、厚みｔ１が厚みｔ２以上で、ブレード部の先端側１／２の体積がより大きくなると、スティックスリップ現象への影響がより小さく抑えられる。そして、実施例１，５～８から、厚みｔ２が１．５ｍｍ以上であると、スティックスリップ現象への影響がより小さく抑えられ、厚みｔ２が３．０ｍｍ未満であると、トナーの回収率がより向上する。そして、実施例１，９～１２から、差ｔ３－ｔ２が０．０５ｍｍ以上３．０ｍｍ以下であると、トナーの回収率がより向上する。そして、実施例１，１３～１６から、自由長Ｌが５．０ｍｍ以上１２ｍｍ以下であると、トナーの回収率がより向上する。そして、実施例１，１７～１８から、突条の幅Ｓが自由長Ｌの１／２以下であると、トナーの回収率がより向上する。 According to Examples 1 to 4, when the thickness t1 is equal to or more than the thickness t2 and the volume at the tip side の of the blade portion is larger, the influence on the stick-slip phenomenon is suppressed to a smaller extent. Further, from Examples 1, 5 to 8, when the thickness t2 is 1.5 mm or more, the influence on the stick-slip phenomenon is further suppressed, and when the thickness t2 is less than 3.0 mm, the toner recovery rate is reduced. Better. Further, from Examples 1 and 9 to 12, when the difference t3-t2 is 0.05 mm or more and 3.0 mm or less, the toner recovery rate is further improved. From Examples 1 and 13 to 16, when the free length L is 5.0 mm or more and 12 mm or less, the toner recovery rate is further improved. Further, from Examples 1 and 17 to 18, when the width S of the ridge is not more than の of the free length L, the toner recovery rate is further improved.
　以上、本発明の実施例について詳細に説明したが、本発明は上記実施例に何ら限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の改変が可能である。 Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.

Claims (6)

  1. 　ゴム弾性体で構成され先端で像担持体の表面を摺擦して該表面を清掃するブレード部と、前記ブレード部の基端側に接合された保持部と、を有する電子写真機器用クリーニングブレードであって、
    　前記ブレード部の像担持体に対向する面とは反対の面の先端側に、前記ブレード部の長手方向に沿って延びる突条を有し、
    　前記突条における高さが最大となる位置が、前記ブレード部の先端側の端部よりも基端側にあり、
    　前記ブレード部の先端側の端部における厚みｔ１が、前記ブレード部の先端と基端の間の中間部における厚みｔ２の１／２以上であることを特徴とする電子写真機器用クリーニングブレード。     A cleaning blade for an electrophotographic device, comprising: a blade portion made of a rubber elastic body and rubbing the surface of the image carrier with its tip to clean the surface; and a holding portion joined to a base end side of the blade portion. And
    On the distal end side of the surface of the blade portion opposite to the surface facing the image carrier, a ridge extending along the longitudinal direction of the blade portion is provided,
    The position at which the height of the ridge is maximum is closer to the base end than the end of the blade portion on the distal end side,
    A cleaning blade for an electrophotographic apparatus, wherein a thickness t1 at a distal end of the blade is at least １ ／ of a thickness t2 at an intermediate portion between a distal end and a base of the blade.
  2. 　前記ブレード部の先端側の端部における厚みｔ１が、前記ブレード部の先端と基端の間の中間部における厚みｔ２以上であることを特徴とする請求項１に記載の電子写真機器用クリーニングブレード。 2. The cleaning blade for an electrophotographic apparatus according to claim 1, wherein a thickness t <b> 1 at a distal end portion of the blade portion is equal to or greater than a thickness t <b> 2 at an intermediate portion between a distal end and a base end of the blade portion. .
  3. 　前記ブレード部の先端と基端の間の中間部における厚みｔ２が、１．５ｍｍ以上３．０ｍｍ未満であることを特徴とする請求項１または２に記載の電子写真機器用クリーニングブレード。 3. The cleaning blade for an electrophotographic apparatus according to claim 1, wherein a thickness t2 at an intermediate portion between the distal end and the proximal end of the blade portion is 1.5 mm or more and less than 3.0 mm.
  4. 　前記突条における高さが最大となる位置における厚みｔ３と前記ブレード部の先端と基端の間の中間部における厚みｔ２の差ｔ３－ｔ２が、０．０５ｍｍ以上３．０ｍｍ以下であることを特徴とする請求項１から３のいずれか１項に記載の電子写真機器用クリーニングブレード。 The difference t3-t2 between the thickness t3 at the position where the height of the ridge is maximum and the thickness t2 at the intermediate portion between the tip end and the base end of the blade portion is 0.05 mm or more and 3.0 mm or less. The cleaning blade for an electrophotographic device according to claim 1, wherein the cleaning blade is a cleaning blade.
  5. 　前記ブレード部の自由長Ｌが、５．０ｍｍ以上１２ｍｍ以下であることを特徴とする請求項１から４のいずれか１項に記載の電子写真機器用クリーニングブレード。 5. The cleaning blade for an electrophotographic device according to claim 1, wherein a free length L of the blade portion is 5.0 mm or more and 12 mm or less.
  6. 　前記突条の幅Ｓが、前記ブレード部の自由長Ｌの１／２以下であることを特徴とする請求項１から５のいずれか１項に記載の電子写真機器用クリーニングブレード。 6. The cleaning blade for an electrophotographic device according to claim 1, wherein a width S of the ridge is equal to or less than の of a free length L of the blade portion. 7.
PCT/JP2019/025270 2018-07-02 2019-06-26 Cleaning blade for electrophotographic device WO2020008966A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59161161U (en) * 1983-04-12 1984-10-29 東海ゴム工業株式会社 cleaning blade
JP2005242222A (en) * 2004-02-27 2005-09-08 Ricoh Co Ltd Image forming apparatus and process cartridge
US20080232874A1 (en) * 2007-03-21 2008-09-25 Xerox Corporation Cleaning blade edge stiffener to improve blade tucking robustness

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59161161U (en) * 1983-04-12 1984-10-29 東海ゴム工業株式会社 cleaning blade
JP2005242222A (en) * 2004-02-27 2005-09-08 Ricoh Co Ltd Image forming apparatus and process cartridge
US20080232874A1 (en) * 2007-03-21 2008-09-25 Xerox Corporation Cleaning blade edge stiffener to improve blade tucking robustness

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