Patents by Inventor Syohji Tomita
Syohji Tomita has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11609507Abstract: A powder storage device includes a container housing and a powder storage. The container housing is configured to allow the powder container to rotate around a rotation axis ?. When the powder container is rotated from an installing position to a predetermined position in a peeling-off rotation direction around the rotation axis ?, a supply port moves to a position corresponding to a receiving port, a bonder in which the sealer adheres to the powder container is peeled off, and thus the supply port and the receiving port are interconnected.Type: GrantFiled: September 7, 2022Date of Patent: March 21, 2023Assignee: SHARP KABUSHIKI KAISHAInventor: Syohji Tomita
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Patent number: 7676167Abstract: An apparatus for forming an image according to the present invention includes a coverage rate finder, a developing unit, and a control unit. The coverage rate finder finds the coverage rate of the image. The developing unit holds developer in it and includes a stirring means for stirring the held developer at a stirring speed. The developing unit supplies the stirred developer to a surface of an image carrier. When the apparatus forms the image consecutively on sheets of paper, the control unit changes the stirring speed in proportion to the coverage rate. When the apparatus forms an image with a higher coverage rate consecutively on sheets of paper, the control unit makes the stirring speed higher.Type: GrantFiled: April 10, 2007Date of Patent: March 9, 2010Assignee: Sharp Kabushiki KaishaInventors: Tohru Yoshioka, Shuichi Morikuni, Syohji Tomita, Masatsugu Nakamura
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Patent number: 7620351Abstract: A developing device comprises a stirring roller 7 having stirring blades 7a for stirring a developer, a developing roller 3 for transferring the developer to an electrostatic latent image, a control member 4 for controlling the amount of developer transferred from the developing roller 3 to the electrostatic latent image, a reflux plate 6 by which the excess developer resulting from control by the control member 4 is flowed back to the stirring roller 7, one end portion of the reflux plate 6 being disposed in the vicinity of the outer periphery of the stirring roller 7, part of the developer stirred by the stirring roller 7 flying toward the reflux plate 6, wherein said one end portion of the reflux plate 6 is disposed at a position remote from the stirring roller 7 over a distance greater then the maximum fly distance of the developer provided by rotation of the stirring roller 7.Type: GrantFiled: September 7, 2004Date of Patent: November 17, 2009Assignee: Sharp Kabushiki KaishaInventors: Hiroshi Onda, Toshio Nishino, Syohji Tomita, Takeshi Wakabayashi, Hiroshi Ishii
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Patent number: 7421216Abstract: A target specified range of a toner density is correctly set so that a toner density is consistently appropriately controlled. If a specified range within which a measured toner density TD (%) should fall is set based on an expression (2) below using a volume average diameter Dcav_vol (?m) of a magnetic carrier and a volume average diameter Dtav_vol (?m) of a toner, the target specified range can be correctly set, thereby making it possible to consistently appropriately control the toner density.Type: GrantFiled: October 29, 2004Date of Patent: September 2, 2008Assignee: Sharp Kabushiki KaishaInventors: Hiroshi Onda, Syohji Tomita, Hiroshi Ishii
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Patent number: 7406280Abstract: A device including a developing roller having a magnet roller for transporting developer, and developing an electrostatic latent image, a regulating member regulating transportation amount of the developer transported to the electrostatic latent image with the development roller, and a reflux plate refluxing excess developer regulated by the regulating member away from the regulating member is constructed to comprise a rubbing member arranged to face the developing roller, at a second gap larger than a first gap defined by the developing roller and the regulating member, and rubbing developer transported to the first gap. The rubbing member carries out preliminary electrification on developer and then the regulating member carries out main electrification on the preliminarily electrified developer.Type: GrantFiled: September 7, 2004Date of Patent: July 29, 2008Assignee: Sharp Kabushiki KaishaInventors: Syohji Tomita, Toshio Nishino, Hiroshi Onda, Takeshi Wakabayashi, Hiroshi Ishii
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Patent number: 7366447Abstract: Flanges are pressed into opposite ends of a photoreceptor drum. A noncontact charging roller is arranged so as to face, but have no direct contact with, the photoreceptor drum. On both end portions of the noncontact charging roller, spacers are provided for maintaing a gap between the photoreceptor drum and the noncontact charging roller. The spacers are of tape form and wound around the noncontact charging roller. Winding positions of the spacers are distant by more than an effective projection length of each of the flanges from respective opposite ends of the charging roller.Type: GrantFiled: March 10, 2004Date of Patent: April 29, 2008Assignee: Sharp Kabushiki KaishaInventors: Takashi Mukai, Syohji Tomita, Hiroshi Onda, Atsuyuki Katoh, Hiroshi Ishii, Yoshinobu Okumura
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Publication number: 20070237535Abstract: An apparatus for forming an image according to the present invention includes a coverage rate finder, a developing unit, and a control unit. The coverage rate finder finds the coverage rate of the image. The developing unit holds developer in it and includes a stirring means for stirring the held developer at a stirring speed. The developing unit supplies the stirred developer to a surface of an image carrier. When the apparatus forms the image consecutively on sheets of paper, the control unit changes the stirring speed in proportion to the coverage rate.Type: ApplicationFiled: April 10, 2007Publication date: October 11, 2007Applicant: Sharp Kabushiki KaishaInventors: Tohru Yoshioka, Shuichi Morikuni, Syohji Tomita, Masatsugu Nakamura
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Publication number: 20070071507Abstract: A developing device comprises a stirring roller 7 having stirring blades 7a for stirring a developer, a developing roller 3 for transferring the developer to an electrostatic latent image, a control member 4 for controlling the amount of developer transferred from the developing roller 3 to the electrostatic latent image, a reflux plate 6 by which the excess developer resulting from control by the control member 4 is flowed back to the stirring roller 7, one end portion of the reflux plate 6 being disposed in the vicinity of the outer periphery of the stirring roller 7, part of the developer stirred by the stirring roller 7 flying toward the reflux plate 6, wherein said one end portion of the reflux plate 6 is disposed at a position remote from the stirring roller 7 over a distance greater then the maximum fly distance of the developer provided by rotation of the stirring roller 7.Type: ApplicationFiled: September 7, 2004Publication date: March 29, 2007Inventors: Hiroshi Onda, Toshio Nishino, Syohji Tomita, Takeshi Wakabayashi, Hiroshi Ishii
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Publication number: 20070058995Abstract: A target specified range of a toner density is correctly set so that a toner density is consistently appropriately controlled. If a specified range within which a measured toner density TD (%) should fall is set based on an expression (2) below using a volume average diameter Dcav_vol (?m) of a magnetic carrier and a volume average diameter Dtav_vol (?m) of a toner, the target specified range can be correctly set, thereby making it possible to consistently appropriately control the toner density.Type: ApplicationFiled: October 29, 2004Publication date: March 15, 2007Inventors: Hiroshi Onda, Syohji Tomita, Hiroshi Ishii
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Publication number: 20070025777Abstract: A device including a developing roller having a magnet roller for transporting developer, and developing an electrostatic latent image, a regulating member regulating transportation amount of the developer transported to the electrostatic latent image with the development roller, and a reflux plate refluxing excess developer regulated by the regulating member away from the regulating member is constructed to comprise a rubbing member arranged to face the developing roller, at a second gap larger than a first gap defined by the developing roller and the regulating member, and rubbing developer transported to the first gap. The rubbing member carries out preliminary electrification on developer and then the regulating member carries out main electrification on the preliminarily electrified developer.Type: ApplicationFiled: September 7, 2004Publication date: February 1, 2007Inventors: Syohji Tomita, Toshio Nishino, Hiroshi Onda, Takeshi Wakabayashi, Hiroshi Ishii
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Patent number: 7167665Abstract: The present removing system has a feature to remove a left-over toner that is accumulated on a brush that touches a left-over toner on a photoreceptor. More specifically, the present removing system is so arranged that an alternating voltage (superimposing voltage) on which a positive direct current voltage is superimposed is applied onto a conductive brush in accordance with a user's instruction. With this arrangement, even if a positively electrified left-over toner is accumulated on the conductive brush, it is possible to remove the positively electrified left-over toner accumulated on the conductive brush, because a voltage value (positive) applied on the conductive brush in a moment is large. Moreover, because a voltage of the conductive brush becomes negative in a moment, it is possible to remove a negatively electrified left-over toner attached on the conductive brush.Type: GrantFiled: September 25, 2003Date of Patent: January 23, 2007Assignee: Sharp Kabushiki KaishaInventors: Syohji Tomita, Atsuyuki Katoh, Hiroshi Onda, Takashi Mukai, Hiroshi Ishii
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Publication number: 20060170935Abstract: Flanges are pressed into opposite ends of a photoreceptor drum. A noncontact charging roller is arranged so as to face, but have no direct contact with, the photoreceptor drum. On both end portions of the noncontact charging roller, spacers are provided for maintaing a gap between the photoreceptor drum and the noncontact charging roller. The spacers are of tape form and wound around the noncontact charging roller. Winding positions of the spacers are distant by more than an effective projection length of each of the flanges from respective opposite ends of the charging roller.Type: ApplicationFiled: March 10, 2004Publication date: August 3, 2006Inventors: Takashi Mukai, Syohji Tomita, Hiroshi Onda, Atsuyuki Katoh, Hiroshi Ishii, Yoshinobu Okumura
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Publication number: 20040228658Abstract: The present removing system has an object to remover a left-over toner that is accumulated on a brush that touches a left-over toner on a photoreceptor. More specifically, the present removing system is so arranged that an alternating voltage (superimposing voltage) on which a positive direct current voltage is superimposed is applied onto a conductive brush in accordance with a user's instruction. With this arrangement, even if a positively electrified left-over toner is accumulated on the conductive brush, it is possible to remove the positively electrified left-over toner accumulated on the conductive brush, because a voltage value (positive) applied on the conductive brush in a moment is large. Moreover, because a voltage of the conductive brush becomes negative in a moment, it is possible to remove a negatively electrified left-over toner attached on the conductive brush.Type: ApplicationFiled: September 25, 2003Publication date: November 18, 2004Inventors: Syohji Tomita, Atsuyuki Katoh, Hiroshi Onda, Takashi Mukai, Hiroshi Ishii