Polyurethane Blade (e.g., Polyurethane Binder, Polyurethane Spheres In Matrix, Etc.) Patents (Class 430/119.84)
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Patent number: 9037069Abstract: In a method for producing a cleaning blade, a first composition obtained by causing a reaction of diphenylmethane diisocyanate and a first aliphatic polyester polyol which has a number-average molecular weight of 2000 to 3500 and is used in an amount of 20 to 40 mol % relative to the diphenylmethane diisocyanate and a second composition containing a urethane rubber-synthesizing catalyst and a second aliphatic polyester polyol which has a number-average molecular weight of 2000 to 3500 and is the same as or different from the first aliphatic polyester polyol are mixed so that a relationship between a number of moles (MNCO [mol]) of an NCO group in the first composition and a number of moles (MOH [mol]) of an OH group in the second composition satisfies 0.05?MOH/MNCO?0.20.Type: GrantFiled: April 28, 2014Date of Patent: May 19, 2015Assignee: Canon Kabushiki KaishaInventors: Masahiro Watabe, Masaya Kawada, Tomohiro Tanoue
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Patent number: 8923745Abstract: A cleaning blade includes a contact portion that contacts a member to be cleaned, and the contact portion at least contains polyurethane rubber and has at least two different endothermic peak temperatures by differential scanning calorimetry in a range of 100° C. or higher.Type: GrantFiled: September 18, 2013Date of Patent: December 30, 2014Assignee: Fuji Xerox Co., Ltd.Inventors: Daisuke Tano, Masato Ono, Tsutomu Sugimoto, Noriaki Kojima, Yoshinori Takahashi, Kei Tanaka
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Patent number: 8660465Abstract: Presently disclosed embodiments relate generally to layers that are useful in imaging apparatus members and components, for use in electrophotographic, including digital, apparatuses. More particularly, the embodiments pertain to an electrophotographic imaging member having its outer surface patterned such that friction with the cleaning blade is significantly reduced.Type: GrantFiled: October 25, 2010Date of Patent: February 25, 2014Assignee: Xerox CorporationInventors: Woo Soo Kim, Nan-Xing Hu, Cuong Vong, Yvan Gagnon, Vladislav Skorokhod
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Patent number: 8543037Abstract: The image forming apparatus includes a photoreceptor bearing an electrostatic image; a developing device developing the electrostatic image with a developer including a toner to form a toner image on the photoreceptor; a transferring device transferring the toner image onto a receiving material; and a cleaning device having a cleaning blade cleaning the surface of the photoreceptor. The photoreceptor includes an electroconductive substrate, a photosensitive layer and an outermost layer having projected portions thereon. The outermost layer and projected portions include the same crosslinked charge transport material. The outermost layer has a surface roughness property such that the number of projected portions having height greater than Rz/2 is from 40 to 90 in a length of 12 mm, wherein Rz represents ten-point mean roughness of the outermost layer. The tip of the cleaning blade is contacted with the photoreceptor at a linear pressure of from 80 g/cm to 150 g/cm.Type: GrantFiled: November 2, 2009Date of Patent: September 24, 2013Assignee: Ricoh Company, Ltd.Inventors: Kazuhiro Egawa, Yukio Fujiwara, Hidetoshi Kami, Kohichi Ohshima
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Patent number: 8406674Abstract: An image forming apparatus includes a photosensitive medium to be charged with a predetermined potential by a charging member, an exposing unit to expose the photosensitive medium to vary a charging level of the photosensitive medium, a developing unit to form an image for one or more colors on the photosensitive medium, a transfer medium to transfer the image from the photosensitive medium, a cleaning unit to clean the transfer medium, and a controller to control an optical power of the exposing unit to be lower than that during forming of the image when a toner band is applied to lubricate at least one of the cleaning unit and the transfer medium.Type: GrantFiled: October 9, 2007Date of Patent: March 26, 2013Assignee: Samsung Electronics Co., LtdInventors: Joong-gwang Shin, Sung-min Park
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Patent number: 8340562Abstract: An image forming apparatus including an image bearing member that bears a latent image and has a surface layer; a charging device that charges the surface of the image bearing member: a latent image forming device that forms the latent image on the surface of the image bearing member; a development device that develops the latent image formed on the surface of the image bearing member with a development agent to form a toner image thereon; a transfer device that transfers the toner image to a transfer medium; a cleaning device that removes residual toner remaining on the surface of the image bearing member after transferring the toner image to the transfer medium; and a protection agent supplying device that supplies a protection agent to the surface layer of the image bearing member that forms a protection layer thereon, wherein the protection agent comprises a metal soap and boron nitride and the amount of the boron nitride in the protection layer applied to the image bearing member after image formation isType: GrantFiled: August 4, 2009Date of Patent: December 25, 2012Assignee: Ricoh Company, Ltd.Inventors: Kumiko Hatakeyama, Toshiyuki Kabata
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Patent number: 8139981Abstract: A cleaning station for removing particulate material from a moving web in an electrographic printer/copier includes a customer-replaceable web-cleaner device with a support bracket/backup shoe assembly. A quick disconnect feature enables the cleaner cover to be de-coupled from the cleaner body to allow the debris to be easily removed with replacing the web-cleaner. The cleaner has a cleaner sump that is spring loaded to force contact of four strategically placed stops in the sump with a stationary back up shoe assembly allowing for higher precision of blade engagement with a transport web or a photoconductor. The web-cleaner has two wiper blades, each having each having a distinguishment such that the distinguishment distinguishes one wiper blade from the other wiper blade when the blades are locked into the cleaner sump by springs, to facilitate material removed from the web. The wiper cleaning blades and the cover assembly are easily replaceable by the operator in the correct order.Type: GrantFiled: January 22, 2008Date of Patent: March 20, 2012Assignee: Eastman Kodak CompanyInventors: Francisco L. Ziegelmuller, Thomas C. Bidwell, Edward T. Miskinis, Daniel R. Palmer, Jeffrey A. Pitas, Christoper S. Garcia
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Patent number: 7981585Abstract: In an image forming apparatus comprising a charging section, an exposure section, a developing section, a transfer section, a peeling section, a cleaning section including a cleaning blade, and a fixing section, the cleaning blade is composed by dispersing 15 parts by weight through 33 parts by weight of fluorine resin particulate and secondary particles thereof into 100 parts by weight of a synthetic resin of a base material and, on a surface of the cleaning blade 16a, and a number of the secondary particles of the fluorine resin particulate having a particle diameter of 0.5 ?m or more existing in unit area of 100 ?m2 is made to be 50 or less.Type: GrantFiled: October 31, 2007Date of Patent: July 19, 2011Assignee: Sharp Kabushiki KaishaInventors: Mitsuru Tokuyama, Kouichi Takenouchi, Hiroo Naoi, Kiyofumi Morimoto, Kazuma Hinoue
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Patent number: 7517629Abstract: A method of forming a toner image employing a photoreceptor is described. The photoreceptor comprises a photosensitive layer on a cylindrical conductive substrate, Formula (1) and Formula (2) are held, 0<Pmax<2P??Formula (1) 2?(Pmax/D)×100?50??Formula (2) wherein P (?m) is the average of the coating layer thickness in central section in the width direction of the photoreceptor, Pmax (?m) is average of the maximum value of the layer thickness out of the image forming region, and D (?m) is average of distance between point, at which said maximum value is obtained, and edge of the coating layer, and the toner contains 1.0 to 7.0 number % of toner particles having number based particle diameter not more than 3.17 ?m based on whole number of toner particles, and number average toner particle diameter is 4-9 ?m.Type: GrantFiled: August 24, 2004Date of Patent: April 14, 2009Assignee: Konica Minolta Business Technologies, Inc.Inventors: Nobuaki Kobayashi, Masao Asano, Hiroshi Yamazaki