Patents by Inventor Michio Mitsui
Michio Mitsui 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: 10016770Abstract: The present invention solves a problem of a trade-off between increases in paint discharge rate and maintenance of painting quality. A rotary atomizing electrostatic applicator includes a bell cup 10 whose back 10a is hit by atomization air SA-IN at an angle of 90 degrees or less; and first air holes 30 adapted to discharge the atomization air SA-IN directed at the back 10a of the bell cup, wherein the first air holes 30 are arranged at equal intervals on a circumference centered around a rotation axis of the bell cup 10, the first air holes 30 are oriented in a direction opposite to a rotation direction of the bell cup 10; and the atomization air SA-IN discharged through the first air holes 30 is twisted in the direction opposite to the rotation direction of the bell cup 10 at an angle of 50 degrees or more and less than 60 degrees.Type: GrantFiled: February 11, 2016Date of Patent: July 10, 2018Assignees: Toyota Jidosha Kabushiki Kaisha, Ransburg Industrial Finishing K.K.Inventors: Isamu Yamasaki, Shunya Kobayashi, Michio Mitsui, Osamu Yoshida, Yoshiharu Yokomizo
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Patent number: 9943864Abstract: An electrostatic coater capable of realizing high-level coating quality is provided. Shaping air SA, discharged from an air port, is directed radially outward. An elevation angle thereof preferably ranges from 10 to 20 degrees. Further, the shaping air SA is a flow in a state of being twisted in a direction opposite to the rotation direction R of a bell cup. The twisting angle about the axis O of the bell cup preferably ranges from 38 to 60 degrees. A liquid thread of paint extends radially outward from the outer peripheral edge of the bell cup, and the paint separated from the tip end thereof becomes a particle. It is preferable that the shaping air SA collides with the paint particle at a point P where the momentum of the paint particle is decreased of the paint particle is decreased.Type: GrantFiled: October 29, 2014Date of Patent: April 17, 2018Assignee: RANSBURG INDUSTRIAL FINISHING K.K.Inventors: Michio Mitsui, Osamu Yoshida, Yoshiji Yokomizo
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Patent number: 9505014Abstract: A rotary atomizing head enables cleaning by decomposing from the atomizing head, and enables internal cleaning without decomposing to individual components when paint is changed to a new one of another color. A structural component has a front wall acting as a hub, side wall extending rearward from an outer circumferential perimeter of the front wall to make a circumferentially continuous plane, legs each having a pawl and a bottom wall. The structural component is detachably mounted in a central concavity of an atomizing head body. A bottom wall of the structural component has formed a spoon-cut recess. The central concavity has an inclined circumferential wall, and the side wall of the structural component has an inclined outer circumferential surface complementary with the circumferential wall of the atomizing head body to get in substantial contact with the circumferential wall throughout the entire area of the outer circumferential wall.Type: GrantFiled: February 13, 2013Date of Patent: November 29, 2016Assignees: TOYOTA JIDOSHA KABUSHIKI KAISHA, RANSBURG INDUSTRIAL FINISHING K.K.Inventors: Michio Mitsui, Ryuji Tani, Isamu Yamazaki, Toru Yokota
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Publication number: 20160271630Abstract: An electrostatic coater capable of realizing high-level coating quality is provided. Shaping air SA, discharged from an air port, is directed radially outward. An elevation angle thereof preferably ranges from 10 to 20 degrees. Further, the shaping air SA is a flow in a state of being twisted in a direction opposite to the rotation direction R of a bell cup. The twisting angle about the axis O of the bell cup preferably ranges from 38 to 60 degrees. A liquid thread of paint extends radially outward from the outer peripheral edge of the bell cup, and the paint separated from the tip end thereof becomes a particle. It is preferable that the shaping air SA collides with the paint particle at a point P where the momentum of the paint particle is decreased of the paint particle is decreased.Type: ApplicationFiled: October 29, 2014Publication date: September 22, 2016Inventors: Michio Mitsui, Osamu Yoshida, Yoshiji Yokomizo
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Publication number: 20160236214Abstract: The present invention solves a problem of a trade-off between increases in paint discharge rate and maintenance of painting quality. A rotary atomizing electrostatic applicator includes a bell cup 10 whose back 10a is hit by atomization air SA-IN at an angle of 90 degrees or less; and first air holes 30 adapted to discharge the atomization air SA-IN directed at the back 10a of the bell cup, wherein the first air holes 30 are arranged at equal intervals on a circumference centered around a rotation axis of the bell cup 10, the first air holes 30 are oriented in a direction opposite to a rotation direction of the bell cup 10; and the atomization air SA-IN discharged through the first air holes 30 is twisted in the direction opposite to the rotation direction of the bell cup 10 at an angle of 50 degrees or more and less than 60 degrees.Type: ApplicationFiled: February 11, 2016Publication date: August 18, 2016Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, Ransburg Industrial Finishing K.K.Inventors: Isamu YAMASAKI, Shunya KOBAYASHI, Michio MITSUI, Osamu YOSHIDA, Yoshiharu YOKOMIZO
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Patent number: 9295999Abstract: The rotary atomizing painting device is provided with a bell cup (3) disposed at the most front part in the paint spray direction X and axially supported by a rotating shaft (2b) and a shaping air ring (4) disposed rearward of this bell cup (3) in the paint spray direction and in which a plurality of discharge openings (4a) is formed on the periphery centered on the rotating shaft (2b). The plurality of discharge openings (4a) is formed such that the axial direction of the plurality of discharge openings (4a) is in a direction and a slant to the rotating shaft (2b). The axial direction of the plurality of discharge openings (4a) is formed to aim at a back surface part (3b), which is a part on the back surface side of the bell cup (3) from the paint spray direction.Type: GrantFiled: September 8, 2011Date of Patent: March 29, 2016Assignees: Toyota Jidosha Kabushiki Kaisha, Ransburg Industrial Finishing K.K.Inventors: Isamu Yamasaki, Michio Mitsui, Yoshiharu Yokomizo, Toshio Hosoda
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Patent number: 8720797Abstract: A rotary atomizing head 1, which has an inner peripheral surface 2 whose diameter increases from a bottom 21 of the inner peripheral surface toward a tip thereof, and atomizes and releases paint by applying a centrifugal force generated by rotation to the paint supplied to the bottom of the inner peripheral surface, includes a paint supply nozzle 11 for supplying the paint and a cleaning solution to the bottom of the inner peripheral surface, and the paint supply nozzle has a nozzle hole 10a for discharging the paint and the cleaning solution from a rotation center O portion of the rotary atomizing head in a direction substantially perpendicular to a rotation axis of the rotary atomizing head. The rotary atomizing head 1 also includes a dam portion 4 that is provided in an intermediate portion between the bottom and the tip of the inner peripheral surface and dams the paint and the cleaning solution supplied from the paint supply nozzle to the bottom and flow along the inner peripheral surface toward the tip.Type: GrantFiled: May 23, 2008Date of Patent: May 13, 2014Assignees: Toyota Jidosha Kabushiki Kaisha, Ransburg Industrial Finishing K.K.Inventors: Isamu Yamasaki, Atsuo Nabeshima, Michio Mitsui, Toshio Hosoda
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Patent number: 8690076Abstract: An annular dam portion is formed along a circumference of an inner peripheral face of a rotary atomizer head and has a plurality of paint supply holes formed along the circumferential direction at the boundary between the annular dam portion and the inner peripheral face. The annular dam portion is disposed between the bottom of the inner peripheral face and the tip of the inner peripheral face. The dam portion is formed such that a substantially constant distance separates the inner peripheral face from the dam portion.Type: GrantFiled: June 12, 2009Date of Patent: April 8, 2014Assignees: Toyota Jidosha Kabushiki Kaisha, Ransburg Industrial Finishing K.K.Inventors: Isamu Yamasaki, Michio Mitsui, Toshio Hosoda
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Publication number: 20130206874Abstract: The rotary atomizing painting device is provided with a bell cup (3) disposed at the most front part in the paint spray direction X and axially supported by a rotating shaft (2b) and a shaping air ring (4) disposed rearward of this bell cup (3) in the paint spray direction and in which a plurality of discharge openings (4a) is formed on the periphery centered on the rotating shaft (2b). The plurality of discharge openings (4a) is formed such that the axial direction of the plurality of discharge openings (4a) is in a direction and a slant to the rotating shaft (2b). The axial direction of the plurality of discharge openings (4a) is formed to aim at a back surface part (3b), which is a part on the back surface side of the bell cup (3) from the paint spray direction.Type: ApplicationFiled: September 8, 2011Publication date: August 15, 2013Inventors: Isamu Yamasaki, Michio Mitsui, Yoshiharu Yokomizo, Toshio Hosoda
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Patent number: 8490572Abstract: A rotary electrostatic atomizer uses shaping air and pattern control air. Shaping airflow is supplied from shaping air holes aligned along outer one of concentric circles that are concentric with the rotation axis of the bell cup and located behind the front end of the bell cup. Pattern control airflow is supplied from pattern control air holes aligned along inner one of the concentric circles. Both the shaping air flow and the pattern control airflow are expelled in circumferentially twisted directions substantially with an equal twist angle opposite from the rotating direction of the bell cup. The shaping airflow passes a circular line near to and radially outwardly apart from the outer perimeter of the bell cup. The pattern control airflow intersects the shaping airflow from radially inside at the position near to and radially outwardly apart from the outer perimeter of the bell cup.Type: GrantFiled: March 11, 2009Date of Patent: July 23, 2013Inventors: Michio Mitsui, Ryuji Tani, Sadao Inose
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Patent number: 8430058Abstract: Provided is an electrostatic coating apparatus capable of insulating an electric motor electrically from a member, to which an electrostatic high voltage is applied, and reducing the size and weight of the electrostatic coating apparatus. This electrostatic coating apparatus comprises a rotary atomizing head, to which high voltage is electrostatically applied, an electrostatically grounded AC servomotor, and a spindle and a fixed insulating member for insulating the AC servomotor electrically from the rotary atomizing head and a speed-increasing device to be set at the same potential as that of the former. The spindle and the fixed insulating member have insulation distance enlarging portions and of the mode, in which the creepage insulation distances from the speed-increasing device to the AC servomotor are enlarged.Type: GrantFiled: August 7, 2008Date of Patent: April 30, 2013Assignees: Toyota Jidosha Kabushiki Kaisha, Ransburg Industrial Finishing K.K., Harmonic Drive Systems Inc.Inventors: Masahito Sakakibara, Hisanori Nakamura, Youichi Hanai, Hideki Saito, Michio Mitsui, Toshio Hosoda, Kiyoto Kobayashi, Takeshi Ichikawa, Yoshinori Aida
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Patent number: 8342432Abstract: An electrostatic atomizer 30 has a removably attachable canister 24. Once a paint bag 2 housed in the canister 24 exhausts, it is replaced by a new canister 24. Paint in a paint bag 2 is driven out by a mono pump 35 located in a pump segment 23 of the electrostatic atomizer 20. The mono pump 35 has a helical shaft 36 inside a paint feed tube 31. The mono pump 35 is driven by a servomotor via an insulating drive shaft 38. Paint in the paint bag 2 is drawn up when the helical shaft 36 rotates, and it is delivered to a bell cup 21 through the feed tube 31. Quantity of paint atomized by the bell cup 21 and interruption of the atomization are controlled by controlling the rotation of the mono pump 35.Type: GrantFiled: February 27, 2006Date of Patent: January 1, 2013Assignees: Toyota Jidosha Kabushiki Kaisha, Ransburg Industrial Finishing K.K.Inventors: Michio Mitsui, Shinji Tani, Masahito Sakakibara, Kimio Toda, Toshio Hosoda
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Patent number: 8307780Abstract: Intended is to enable an electrostatic coating apparatus including a plurality of needle electrodes formed in an annular shape and having a blot preventing function, to prevent the generation of a spark discharge reliably, in case an arbitrary needle electrode approaches an earth element, and to keep the intensity of a generated electrostatic field properly. A coating gun comprises a blot preventing device including a ring-shaped electrode unit having a plurality of needle electrodes protruding radially at a substantially equal spacing radially outward from an annular base member, and a high-voltage generator for applying a high voltage to the electrode unit. The needle electrodes are connected in parallel with the high-voltage generator through individual resistors, block-by-block resistors and built-in resistors.Type: GrantFiled: October 28, 2008Date of Patent: November 13, 2012Assignees: Toyota Jidosha Kabushiki Kaisha, Ransburg Industrial Finishing K.K.Inventors: Isamu Yamasaki, Akira Kato, Michio Mitsui, Kimiyoshi Nagai
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Patent number: 8261689Abstract: The stain preventing cover is formed from a composite sheet 24 having a three layer structure as a raw material which is produced by laminating a first sheet material 21 having a low dielectric constant and having insulation performance, a second sheet material 22 having a dielectric constant higher than that of the first sheet material 21 or having semiconductivity and a third sheet material 23 having a dielectric constant lower than that of the second sheet material 22 and having insulation performance, in which an end of the second sheet material 22 is positioned together with an end of the first and third sheet materials 21 and 23 adjacent to a electrostatic high voltage part 10 of a coating machine and another end thereof is positioned distant from an earth part 11 of the coating machine to be electrically insulated.Type: GrantFiled: May 15, 2008Date of Patent: September 11, 2012Assignees: Toyota Jidosha Kabushiki Kaisha, Ransburg Industrial Finishing K.K.Inventors: Masahito Sakakibara, Hisanori Nakamura, Youichi Hanai, Hideki Saitou, Michio Mitsui, Masatoshi Iwase
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Patent number: 8225740Abstract: An arm of a coating robot is used to prevent external leakage of a high voltage. A tank is installed on a robotic arm and contains water as an actuating liquid. The water is supplied to a paint cartridge by a pump controlled by a controller. The water sent from the pump under pressure is supplied to the paint cartridge by a conduit tube. A high voltage generator and a bleeder resistor are combined with the tank such that a high voltage generated by the high voltage generator is supplied to the electrostatic paint applicator via the water. For replenishment of water to the tank is attained by relatively connecting a nozzle in communication with a water source to a main pipe. While the high voltage generator generates a high voltage, the nozzle and the main pipe are kept disconnected to maintain electrical insulation between the nozzle and the main pipe.Type: GrantFiled: November 4, 2008Date of Patent: July 24, 2012Assignee: Ransburg Industrial Finishing K.K.Inventors: Michio Mitsui, Ryuji Tani, Sadao Inose
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Publication number: 20120031329Abstract: Provided is an electrostatic coating apparatus capable of insulating an electric motor electrically from a member, to which an electrostatic high voltage is applied, and reducing the size and weight of the electrostatic coating apparatus. This electrostatic coating apparatus comprises a rotary atomizing head, to which high voltage is electrostatically applied, an electrostatically grounded AC servomotor, and a spindle and a fixed insulating member for insulating the AC servomotor electrically from the rotary atomizing head and a speed-increasing device to be set at the same potential as that of the former. The spindle and the fixed insulating member have insulation distance enlarging portions of the mode, in which the creepage insulation distances from the speed-increasing device to the AC servomotor are enlarged.Type: ApplicationFiled: August 7, 2008Publication date: February 9, 2012Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, HARMONIC DRIVE SYSTEMS INC., RANSBURG INDUSTRIAL FINISHING K.K.Inventors: Masahito Sakakibara, Hisanori Nakamura, Youichi Hanai, Hideki Saito, Michio Mitsui, Toshio Hosoda, Kiyoto Kobayashi, Takeshi Ichikawa, Yoshinori Aida
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Patent number: 7966967Abstract: An electrostatic coating system (1) comprising a coating gun (2) for spraying a coating material toward an article (9) to be coated, and a robot arm (3) for moving the coating gun (2) with respect to the article (9) to be coated wherein a voltage is applied to the coating gun (2). A needle-like electrode (11) which is an electrostatic electrode having a pointed end applied with a voltage having the same polarity as that of the voltage applied to the coating gun (2), is attached to the coating gun (2) or the robot arm (3).Type: GrantFiled: September 16, 2005Date of Patent: June 28, 2011Assignees: Toyota Jidosha Kabushiki Kaisha, Ransburg Industrial Finishing K.K.Inventors: Masahito Sakakibara, Shinichi Washizu, Michio Mitsui, Kimiyoshi Nagai
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Publication number: 20110014387Abstract: A rotary electrostatic atomizer uses shaping air and pattern control air. Shaping airflow is supplied from shaping air holes aligned along outer one of concentric circles that are concentric with the rotation axis of the bell cup and located behind the front end of the bell cup. Pattern control airflow is supplied from pattern control air holes aligned along inner one of the concentric circles. Both the shaping air flow and the pattern control airflow are expelled in circumferentially twisted directions substantially with an equal twist angle opposite from the rotating direction of the bell cup. The shaping airflow passes a circular line near to and radially outwardly apart from the outer perimeter of the bell cup. The pattern control airflow intersects the shaping airflow from radially inside at the position near to and radially outwardly apart from the outer perimeter of the bell cup.Type: ApplicationFiled: March 11, 2009Publication date: January 20, 2011Applicant: RANSBURG INDUSTRIAL FINISHING K.K.Inventors: Michio Mitsui, Ryuji Tani, Sadao Inose
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Publication number: 20100307413Abstract: An arm of a coating robot is used to prevent external leakage of a high voltage. A tank is installed on a robotic arm and contains water as an actuating liquid. The water is supplied to a paint cartridge by a pump controlled by a controller. The water sent from the pump under pressure is supplied to the paint cartridge by a conduit tube. A high voltage generator and a bleeder resistor are combined with the tank such that a high voltage generated by the high voltage generator is supplied to the electrostatic paint applicator via the water. For replenishment of water to the tank is attained by relatively connecting a nozzle in communication with a water source to a main pipe. While the high voltage generator generates a high voltage, the nozzle and the main pipe are kept disconnected to maintain electrical insulation between the nozzle and the main pipe.Type: ApplicationFiled: November 4, 2008Publication date: December 9, 2010Applicant: RANSBURG INDUSTRIAL FINISHING K.K.Inventors: Michio Mitsui, Ryuji Tani, Sadao Inose
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Publication number: 20100229792Abstract: Intended is to enable an electrostatic coating apparatus including a plurality of needle electrodes formed in an annular shape and having a blot preventing function, to prevent the generation of a spark discharge reliably, in case an arbitrary needle electrode approaches an earth element, and to keep the intensity of a generated electrostatic field properly. A coating gun comprises a blot preventing device including a ring-shaped electrode unit having a plurality of needle electrodes protruding radially at a substantially equal spacing radially outward from an annular base member, and a high-voltage generator for applying a high voltage to the electrode unit. The needle electrodes are connected in parallel with the high-voltage generator through individual resistors, block-by-block resistors and built-in resistors.Type: ApplicationFiled: October 28, 2008Publication date: September 16, 2010Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, RANSBURG INDUSTRIAL FINISHING K.K.Inventors: Isamu Yamasaki, Akira Kato, Michio Mitsui, Kimiyoshi Nagai