Patents by Inventor Isao Koishi
Isao Koishi 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).
-
Patent number: 7856192Abstract: A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus including a movable member movable from an outside of the main assembly of the apparatus to an inside thereof while carrying the cartridge. The cartridge includes a drum, charging and developing rollers, rotatably connected first and second frames supporting different rollers, drum and developing roller driving force receiving portions, first and second portions-to-be-supported, on one and the other ends of the first frame, first and second portions-to-be-positioned, on one and the other ends of the first frame positioned to first and second main assembly side positioning portions during a lowering movement of the movable member toward a transfer belt, charging and developing bias contacts exposed at the other end, and a portion-to-be-urged, on the first frame upper surface for receiving an elastic force to position the process cartridge relative to the main assembly.Type: GrantFiled: November 21, 2007Date of Patent: December 21, 2010Assignee: Canon Kabushiki KaishaInventors: Isao Koishi, Susumu Nittani, Masatomo Tsuzuki, Chikara Imaizumi
-
Patent number: 7813671Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, includes a drum unit having an electrophotographic photosensitive drum; and a developing unit rotatably connected with the drum unit at a center of rotation. The developing unit includes a developing roller for developing an electrostatic latent image formed on the electrophotographic photosensitive drum with a developer, a developer accommodating portion accommodating the developer, and a supply opening, extending in an axial direction of the developing roller, for supplying the developer to the developing roller from the developer accommodating portion. The rotation axis is within a width of the sealing member as seen in a direction perpendicular to a surface of the sealing member.Type: GrantFiled: April 8, 2008Date of Patent: October 12, 2010Assignee: Canon Kabushiki KaishaInventors: Susumu Nittani, Hideki Maeshima, Masato Tanabe, Isao Koishi
-
Patent number: 7457566Abstract: An electrophotographic photosensitive drum usable with an electrophotographic image forming apparatus, includes a non-circular twisted projection provided at one longitudinal end of the drum, and engageable with a non-circular twisted hole being disposed at a central portion of a driving rotatable member of a main assembly of the image forming apparatus, and an electroconductive member provided on the projection, electrically connected to the drum, and contactable with an electroconductive member electrically connected with a main assembly of the image forming apparatus and disposed in the hole to ground the drum. The contact position between the electroconductive members moves in interrelation with the projection being moved toward the hole by rotation of the driving rotatable member when the projection is engaged with the hole.Type: GrantFiled: September 23, 2005Date of Patent: November 25, 2008Assignee: Canon Kabushiki KaishaInventors: Isao Koishi, Atsushi Numagami, Takahito Ueno
-
Publication number: 20080253803Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, includes a drum unit having an electrophotographic photosensitive drum; and a developing unit rotatably connected with the drum unit at a center of rotation, the developing unit including a developing roller for developing an electrostatic latent image formed on the electrophotographic photosensitive drum with a developer, a developer accommodating portion accommodating the developer, a supply opening, extending in an axial direction of the developing roller, for supplying the developer to the developing roller from the developer accommodating portion; wherein the rotation axis is within a width of the sealing member as seen in a direction perpendicular to a surface of the sealing member.Type: ApplicationFiled: April 8, 2008Publication date: October 16, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Susumu Nittani, Hideki Maeshima, Masato Tanabe, Isao Koishi
-
Publication number: 20080159772Abstract: A process cartridge is detachably mountable to a main assembly of an electrophotographic image forming apparatus including a movable member movable from an outside of the main assembly of the apparatus to an inside thereof while carrying the process cartridge. The cartridge includes a drum, charging and developing rollers, rotatably connected first and second frames supporting different rollers, drum and developing roller driving force receiving portions, first and second portions-to-be-supported, on one and the other ends of the first frame, first and second portions-to-be-positioned, on one and the other ends of the first frame positioned to first and second main assembly side positioning portions during a lowering movement of the movable member toward a transfer belt, charging and developing bias contacts exposed at the other end, and a portion-to-be-urged, on the first frame upper surface for receiving an elastic force to position the process cartridge relative to the main assembly.Type: ApplicationFiled: January 17, 2007Publication date: July 3, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Isao Koishi, Susumu Nittani, Masatomo Tsuzuki, Chikara Imaizumi
-
Publication number: 20080159775Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus including a movable member movable from an outside of the main assembly of the apparatus to an inside thereof while carrying said process cartridge, said process cartridge includes 1) an electrophotographic photosensitive drum; 2) a charging roller for charging said electrophotographic photosensitive drum; 3) a first frame for supporting said electrophotographic photosensitive drum and said charging roller; 4) a developing roller for developing an electrostatic latent image formed on said electrophotographic photosensitive drum with a developer; 5) a second frame for supporting said developing roller, said second frame being rotatably connected with said first frame; 6) a drum driving force receiving portion, provided on one longitudinal end of said electrophotographic photosensitive drum, for receiving a driving force for rotating said electrophotographic photosensitive drum from the main assembly ofType: ApplicationFiled: November 21, 2007Publication date: July 3, 2008Applicant: CANON KABUSHIKI KAISHAInventors: Isao Koishi, Susumu Nittani, Masatomo Tsuzuki, Chikara Imaizumi
-
Patent number: 7315710Abstract: An electrophotographic photosensitive drum supporting apparatus for rotatably supporting a photosensitive drum includes a first supporting member having a first hole for supporting one end of the drum, and first and second surfaces on one side and the other side of the first supporting member relative to an imaginary plane passing through the axis of the drum, respectively. The first and second surfaces are inclined with respect to the plane so as to contact with the drum and are provided on the inner surface of the first hole. The apparatus also includes a second supporting member having a second hole for supporting the other end of the drum, and a third and a fourth surfaces on one side and the other side of the second supporting member relative to the plane, respectively. The third and fourth surfaces are inclined with respect to the plane so as to contact with the drum and are provided on the inner surface of the second hole.Type: GrantFiled: December 29, 2006Date of Patent: January 1, 2008Assignee: Canon Kabushiki KaishaInventors: Takahito Ueno, Atsushi Numagami, Isao Koishi, Akiyoshi Fujita, Shigeo Miyabe
-
Publication number: 20070110474Abstract: An electrophotographic photosensitive drum supporting apparatus for rotatably supporting a photosensitive drum includes a first supporting member having a first hole for supporting one end of the drum, and first and second surfaces on one side and the other side of the first supporting member relative to an imaginary plane passing through the axis of the drum, respectively. The first and second surfaces are inclined with respect to the plane so as to contact with the drum and are provided on the inner surface of the first hole. The apparatus also includes a second supporting member having a second hole for supporting the other end of the drum, and a third and a fourth surfaces on one side and the other side of the second supporting member relative to the plane, respectively. The third and fourth surfaces are inclined with respect to the plane so as to contact with the drum and are provided on the inner surface of the second hole.Type: ApplicationFiled: December 29, 2006Publication date: May 17, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Takahito Ueno, Atsushi Numagami, Isao Koishi, Akiyoshi Fujita, Shigeo Miyabe
-
Patent number: 7184690Abstract: An electrophotographic photosensitive drum supporting apparatus for rotatably supporting a photosensitive drum includes a first supporting member having a first hole for supporting one end of the drum, and first and second surfaces on one side and the other side of the first supporting member relative to an imaginary plane passing through the axis of the drum, respectively. The first and second surfaces are inclined with respect to the plane so as to contact with the drum and are provided on the inner surface of the first hole. The apparatus also includes a second supporting member having a second hole for supporting the other end of the drum, and a third and a fourth surfaces on one side and the other side of the second supporting member relative to the plane, respectively. The third and fourth surfaces are inclined with respect to the plane so as to contact with the drum and are provided on the inner surface of the second hole.Type: GrantFiled: October 5, 2004Date of Patent: February 27, 2007Assignee: Canon Kabushiki KaishaInventors: Takahito Ueno, Atsushi Numagami, Isao Koishi, Akiyoshi Fujita, Shigeo Miyabe
-
Patent number: 7158749Abstract: A cleaning device used in an electrophotographic image forming apparatus includes a frame, an elastic blade contacting an electrophotographic photosensitive drum to remove a developer remaining thereon, a blade supporting member, and a removed developer containing portion containing the developer removed from the drum by the blade. The supporting member includes: a supporting portion attached to the frame for supporting the blade; a first bent portion bent from the supporting portion to an opposite side to an attachment surface where the supporting portion is attached to the frame; a connecting portion extending from the first bent portion to the opposite side in the orthogonal direction; a second bent portion bent from the connecting portion in the orthogonal direction and in a lateral direction of the supporting portion; and an extension portion extending from the second bent portion, in the orthogonal direction and in the lateral direction.Type: GrantFiled: October 5, 2004Date of Patent: January 2, 2007Assignee: Canon Kabushiki KaishaInventors: Takahito Ueno, Atsushi Numagami, Isao Koishi
-
Patent number: 7139502Abstract: A process cartridge detachably mountable to an electrophotographic image forming apparatus main body, including: an electrophotographic photosensitive drum; a cleaning member for removing developer adhering to the photosensitive drum; a removed developer containing portion for containing the developer removed by the cleaning member; a filter member mounted to the removed developer containing portion for allowing ventilation between the interior and exterior of the removed developer containing portion; a recess provided on the removed developer containing portion and covered with the filter member; and a communicating portion provided on the removed developer containing portion for communicating between the interior of the removed developer containing portion and the recess to ventilate therebetween.Type: GrantFiled: October 5, 2004Date of Patent: November 21, 2006Assignee: Canon Kabushiki KaishaInventors: Isao Koishi, Akiyoshi Fujita, Takahito Ueno
-
Patent number: 7072601Abstract: A process cartridge detachably mountable on a main body of an electrophotographic image forming apparatus, and including a first unit for supporting an electrophotographic photosensitive member and a charging member for acting on the photosensitive member, a second unit provided with a force imparting portion, an electrically conductive connecting member for pivotally connecting the first unit and the second unit together, and an electrically conductive member provided in the first unit, wherein the electrically conductive connecting member receives a bias to be supplied from the main body to the charging member when the process cartridge is mounted on the main body, the electrically conductive member is provided in contact with the connecting member to supply the charging member with the bias received by the connecting member when the process cartridge is mounted on the main body, and the force imparting portion imparts to the electrically conductive member an urging force for the electrically conductive memType: GrantFiled: October 5, 2004Date of Patent: July 4, 2006Assignee: Canon Kabushiki KaishaInventors: Masaki Kakitani, Isao Koishi
-
Publication number: 20060051133Abstract: An electrophotographic photosensitive drum usable with an electrophotographic image forming apparatus, includes a non-circular twisted projection having a cross-section with a plurality of corner portions, a non-circular twisted projection being provided at one longitudinal end of the drum, and being engageable with a non-circular twisted hole having a section with a plurality of corner portions, the non-circular twisted hole being disposed at a central portion of a driving rotatable member of a main assembly of the image forming apparatus; and a second electroconductive member contactable with a first electroconductive member electrically connected with a main assembly of the image forming apparatus. The first electroconductive member is disposed in the hole to ground the drum. The second electroconductive member is provided on the projection and is electrically connected with the drum.Type: ApplicationFiled: September 23, 2005Publication date: March 9, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Isao Koishi, Atsushi Numagami, Takahito Ueno
-
Patent number: 7003247Abstract: An electrophotographic photosensitive drum includes a non-circular twisted projection, provided at one longitudinal end of the drum, having a cross-section with a plurality of corner portions, and being engageable with a non-circular twisted hole located at a central portion of a driving rotatable member of a main assembly of an image forming apparatus and has a cross-section with a plurality of corner portions; and a second electroconductive member contactable with a first electroconductive member electrically connected with the main assembly of the image forming apparatus. The first electroconductive member is disposed in the hole to ground the drum. The second electroconductive member is provided on the projection and electrically connected with the drum. The contact position between the first and second electroconductive members moves in interrelation with the projection being retracted toward the hole by rotation of the driving rotatable member when the projection is engaged with the hole.Type: GrantFiled: October 8, 2004Date of Patent: February 21, 2006Assignee: Canon Kabushiki KaishaInventors: Isao Koishi, Atsushi Numagami, Takahito Ueno
-
Publication number: 20050249517Abstract: A process cartridge detachably mountable to an electrophotographic image forming apparatus main body, including: an electrophotographic photosensitive drum; a cleaning member for removing developer adhering to the photosensitive drum; a removed developer containing portion for containing the developer removed by the cleaning member; a filter member mounted to the removed developer containing portion for allowing ventilation between the interior and exterior of the removed developer containing portion; a recess provided on the removed developer containing portion and covered with the filter member; and a communicating portion provided on the removed developer containing portion for communicating between the interior of the removed developer containing portion and the recess to ventilate therebetween.Type: ApplicationFiled: October 5, 2004Publication date: November 10, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Isao Koishi, Akiyoshi Fujita, Takahito Ueno
-
Publication number: 20050238395Abstract: A cleaning device to be used in an electrophtographic image forming apparatus, the cleaning device including a frame, an elastic blade elastically contacting an electrophotographic photosensitive drum to remove a developer remaining thereon, a supporting member for supporting the blade, and a removed developer containing portion for containing therein the developer removed from the drum by the blade.Type: ApplicationFiled: October 5, 2004Publication date: October 27, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Takahito Ueno, Atsushi Numagami, Isao Koishi
-
Publication number: 20050238387Abstract: An electrophotographic photosensitive drum supporting apparatus for rotatably supporting a photosensitive drum, the supporting apparatus having a first supporting member having a first hole for supporting one end of the drum, and a first and a second surfaces on one side and the other side relative to an imaginary plane passing through the axis of the drum, respectively, the first and second surfaces inclined with respect to the plane so as to contact with the drum and provided on the inner surface of the first hole, a second supporting member having a second hole for supporting the other end of the drum, and a third and a fourth surfaces on one side and the other side relative to the plane, respectively, the third and fourth surfaces inclined with respect to the plane so as to contact with the drum and provided on the inner surface of the second hole, and a plurality of process members provided in contact with the drum, wherein the direction of the resultant force of a force acting on the drum by the pluraliType: ApplicationFiled: October 5, 2004Publication date: October 27, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Takahito Ueno, Atsushi Numagami, Isao Koishi, Akiyosi Fujita, Shigeo Miyabe
-
Publication number: 20050220476Abstract: A process cartridge detachably mountable on a main body of an electrophotographic image forming apparatus, and including a first unit for supporting an electrophotographic photosensitive member and a charging member for acting on the photosensitive member, a second unit provided with a force imparting portion, an electrically conductive connecting member for pivotally connecting the first unit and the second unit together, and an electrically conductive member provided in the first unit, wherein the electrically conductive connecting member receives a bias to be supplied from the main body to the charging member when the process cartridge is mounted on the main body, the electrically conductive member is provided in contact with the connecting member to supply the charging member with the bias received by the connecting member when the process cartridge is mounted on the main body, and the force imparting portion imparts to the electrically conductive member an urging force for the electrically conductive memType: ApplicationFiled: October 5, 2004Publication date: October 6, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Masaki Kakitani, Isao Koishi
-
Publication number: 20050220490Abstract: An electrophotographic photosensitive drum usable with an electrophotographic image forming apparatus, includes a non-circular twisted projection having a cross-section with a plurality of corner portions, non-circular twisted projection being provided at one longitudinal end of the electrophotographic photosensitive drum, and being engageable with a non-circular twisted hole having a section with a plurality of corner portions, the non-circular twisted hole being disposed at a central portion of a driving rotatable member of a main assembly of the image forming apparatus; and a second electroconductive member contactable with a first electroconductive member electrically connected with a main assembly of the image forming apparatus, the first electroconductive member being disposed in the hole to provide a grounding of the electrophotographic photosensitive drum, the second electroconductive member being provided on the projection and being electrically connected with the electrophotographic photosensitive dType: ApplicationFiled: October 8, 2004Publication date: October 6, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Isao Koishi, Atsushi Numagami, Takahito Ueno
-
Patent number: D587304Type: GrantFiled: December 11, 2007Date of Patent: February 24, 2009Assignee: Canon Kabushiki KaishaInventors: Kazunari Murayama, Hideki Maeshima, Masato Tanabe, Isao Koishi