WO2020008966A1 - Lame de nettoyage pour dispositif électrophotographique - Google Patents

Lame de nettoyage pour dispositif électrophotographique 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
Prior art date
Application number
PCT/JP2019/025270
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English (en)
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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Filing date
Publication date
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/fr

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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.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cleaning In Electrography (AREA)

Abstract

La présente invention concerne une lame de nettoyage pour un dispositif électrophotographique de telle sorte qu'une vitesse de collecte de toner est améliorée tandis qu'un broutage est supprimé. Une lame de nettoyage 10 pour un dispositif électrophotographique comprend : une partie de lame 12 qui est formée à partir d'un corps en caoutchouc élastique, l'extrémité de pointe de la partie de lame étant glissée contre la surface d'un support d'image pour nettoyer la surface ; et une partie de support 14 liée à l'extrémité de base de la partie de lame 12. La partie de lame 12 possède une saillie 16 s'étendant le long de la direction longitudinale de la partie lame 12 au bord de la surface 12a de la partie de lame 12 sur le côté opposé à la surface 12b faisant face au support d'image. La position la plus élevée de la saillie 16 est plus proche de l'extrémité de base de la partie de lame 12 que ne l'est l'extrémité de pointe ; l'épaisseur t1 de l'extrémité de pointe de la partie de lame 12 est supérieure ou égale à une moitié de l'épaisseur t2 dans la partie intermédiaire entre l'extrémité de pointe et l'extrémité de base de la partie de lame 12.
PCT/JP2019/025270 2018-07-02 2019-06-26 Lame de nettoyage pour dispositif électrophotographique WO2020008966A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2018125774A JP2020003750A (ja) 2018-07-02 2018-07-02 電子写真機器用クリーニングブレード
JP2018-125774 2018-07-02

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WO2020008966A1 true WO2020008966A1 (fr) 2020-01-09

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59161161U (ja) * 1983-04-12 1984-10-29 東海ゴム工業株式会社 クリ−ニングブレ−ド
JP2005242222A (ja) * 2004-02-27 2005-09-08 Ricoh Co Ltd 画像形成装置及びプロセスカートリッジ
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 (ja) * 1983-04-12 1984-10-29 東海ゴム工業株式会社 クリ−ニングブレ−ド
JP2005242222A (ja) * 2004-02-27 2005-09-08 Ricoh Co Ltd 画像形成装置及びプロセスカートリッジ
US20080232874A1 (en) * 2007-03-21 2008-09-25 Xerox Corporation Cleaning blade edge stiffener to improve blade tucking robustness

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