Abstract: In a rotary atomizer (10) including a rotating bell (92) secured to a rotating shaft (20a) of an air motor (20) held in an atomizer body, the rotating bell having a plurality of orifices (92a) for supplying paint to an object to be painted, the rotating bell being rotated to spray the paint toward the object to be painted, the rotary atomizer comprises a paint passage (102a) with a paint port (112c) at an end thereof fluidly communicating with the orifices of the rotating bell, and a water passage (108) arranged outside of the paint passage and having a water port at an end of the water passage leading to the orifices of the rotating bell. A needle (94) for opening and closing the paint port may be provided.

Abstract: 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.

Abstract: An electrostatic coating system includes a coating robot (1) and an electrostatic atomizer (6) attached to a polyarticular wrist portion (5) of the robot (1). The atomizer (6) includes an end plate (45), metallic connector (50) fixed to the end plate (45) in electric conduction, high voltage generator (20) and bell head (18). Electric power is supplied to the high voltage generator (20) through the connector (50). Wires (53) are connected to the connector (50) to take out high voltage leak caused by contamination like a deposition of paint on outer surfaces of the atomizer (6) through the wires 53 to control the high voltage generator (20) to lower the value of the high voltage applied to the bell head (18) of high voltage leak detected through the wires (53) is larger than a predetermined threshold value.

Abstract: 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.

Abstract: A functional member removably attachable to an atomizer head body 2 is described. The functional member 4 has a sidewall 14 extending continuously in a circumferential direction, a plurality of legs 16 having claws 16a, and a circumferential projection provided radially inward of the legs 16. The circumferential projection 20 sits on an outer circumferential portion of a circumferential seat 22 of head body 2 and in abutment with an outer circumferential surface of the circumferential seat 22. A peripheral wall 8 of a central recess 6 head body 2 is an inclined wall, and an outer circumferential surface 14a of member 4 inclines to be complementary with the inclination of the peripheral wall 8 such that the outer circumferential surface of the member 4 can be substantially in contact with the peripheral wall 8 of the central recess 6 throughout the entire area of the member 4.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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).

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: An electrostatic paint sprayer 10 includes a body member 12 defining a paint passage 12a for flowing liquid paint supplied from a paint source 44, a nozzle assembly 16 adapted to be mounted to the end of the body member 12 so as to fluidly communicate with the paint passage 12a and a plurality of electrode pins 22 disposed about the axis and electrically connected to a electric power source 40. The nozzle assembly includes a paint orifice for discharging the supplied paint along an axis, a plurality of atomizing air orifices for discharging atomizing air to atomize the paint dispensed through the paint orifice and a plurality of shaping orifices for discharging shaping air to form the paint dispensed through the paint orifice into a predetermined pattern.

Abstract: A voltage block device, for preventing the negative electric potential from transferred to the coating material source, has a switching device including a slider which is selectively slidable between first and second positions and has an inlet port fluidly communicated with the coating material source and an outlet port fluidly communicated with the spray, a reservoir including first and second chambers, the inlet and outlet ports are fluidly communicated with the first and second chambers, respectively when the slider is at the first position, and the inlet and outlet ports are fluidly communicated with the second and first chambers, respectively when the slider is at the second position.

Abstract: In a rotary atomizer (10) including a rotating bell (92) secured to a rotating shaft (20a) of an air motor (20) held in an atomizer body, the rotating bell having a plurality of orifices (92a) for supplying paint to an object to be painted, the rotating bell being rotated to spray the paint toward the object to be painted, the rotary atomizer comprises a paint passage (102a) with a paint port (112c) at an end thereof fluidly communicating with the orifices of the rotating bell, and a water passage (108) arranged outside of the paint passage and having a water port at an end of the water passage leading to the orifices of the rotating bell. A needle (94) for opening and closing the paint port may be provided.

Abstract: Total supplied current (I2) and high voltage (Vm) supplied to a rotary atomizer head (5) are detected by a total current sensor (115) and a high voltage sensor (116). Total leak current (I2) in paint paths, thinner paths and air paths inside an electrostatic atomizer (2) is detected via a metal back plate (40) of the electrostatic atomizer (2). When the total leak current value (I2) exceeds a threshold value (Ia), the level Vm of the high voltage applied to the rotary atomizer head (5) is lowered stepwise.

Abstract: An electrostatic coating system includes a coating robot (1) and an electrostatic atomizer (6) attached to a polyarticular wrist portion (5) of the robot (1). The atomizer (6) includes an end plate (45), metallic connector (50) fixed to the end plate (45) in electric conduction, high voltage generator (20) and bell head (18). Electric power is supplied to the high voltage generator (20) through the connector (50). Wires (53) are connected to the connector (50) to take out high voltage leak caused by contamination like a deposition of paint on outer surfaces of the atomizer (6) through the wires 53 to control the high voltage generator (20) to lower the value of the high voltage applied to the bell head (18) of high voltage leak detected through the wires (53) is larger than a predetermined threshold value.

Abstract: 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).