Abstract: An electrostatic coating method in which a plurality of coating materials is respectively retained in a plurality of coating-material containers in a coating material cartridge, and the coating materials are changed by a valve at the time of sending of each of the coating materials, in an electrostatic coating device, each of the coating materials is sent from the coating material cartridge to a coating machine via a common path according to the change, and multilayer coating is performed by the electrostatic coating device.

Abstract: An electrostatic painting method includes supplying, via a pure water supply passage, pure water to a paint tank within which paint is stored, applying a voltage to paint that is pushed out from the paint tank by the supplied pure water, and spraying the paint to which the voltage has been applied, at an object to be painted. Pure water remaining in the pure water supply passage is replaced to increase an electrical resistance value of the pure water before starting to paint the object to be painted.

Abstract: An electrostatic coating method in which a plurality of coating materials is respectively retained in a plurality of coating-material containers in a coating material cartridge, and the coating materials are changed by a valve at the time of sending of each of the coating materials, in an electrostatic coating device, each of the coating materials is sent from the coating material cartridge to a coating machine via a common path according to the change, and multilayer coating is performed by the electrostatic coating device.

Abstract: An electrostatic coating device and an electrostatic coating method each achieve a reduction in working hours and efficient coating at the time when layers are coated with colors. The electrostatic coating device includes a coating material cartridge that includes coating-material containers, a valve that makes a change of colors of coating materials, a common path through which coating materials are able to pass according to the change, and a cleaning circuit that cleans up the common path. The coating material cartridge is configured to be removable from a coating machine. The coating material cartridge may include individual paths respectively connected to the coating-material containers and each of which one of the coating materials passes through, and valves each connected to the common path and respectively connected to the individual paths. Each of the valves may open and close a conduit line between the common path and a corresponding coating-material container.

Abstract: 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.

Abstract: A coating material filling and discharging device includes a coating material supply part configured to supply a coating material to a coating material storage bag arranged inside a case of a coating material cartridge, an extrusion liquid supply part configured to supply extrusion liquid to a surrounding region outside the coating material storage bag within the case, and store the extrusion liquid discharged from the case, an extrusion liquid route that connects an extrusion liquid supply part and the surrounding region with each other, a flowmeter provided in the extrusion liquid route, and a control part configured to determine whether or not filling of the coating material in the coating material cartridge is completed based on a drop of flow speed of the extrusion liquid.

Abstract: A coating material filling and discharging device includes a coating material supply part configured to supply a coating material to a coating material storage bag arranged inside a case of a coating material cartridge, an extrusion liquid supply part configured to supply extrusion liquid to a surrounding region outside the coating material storage bag within the case, and store the extrusion liquid discharged from the case, an extrusion liquid route that connects an extrusion liquid supply part and the surrounding region with each other, a flowmeter provided in the extrusion liquid route, and a control part configured to determine whether or not filling of the coating material in the coating material cartridge is completed based on a drop of flow speed of the extrusion liquid.

Abstract: An electrostatic coating apparatus includes a coating gun that sprays a coating material toward a coated matter, a high-voltage application apparatus that applies a high voltage to the coating gun, a bell-side current calculation unit that calculates a bell-side current to flow from the coating gun to the coated matter, an earth-side current measurement unit that measures an earth-side current to flow from the coated matter to the earth, and an earth check unit that detects an abnormal earth state of the coated matter, depending on a magnitude relation between the bell-side current calculated at the time of electrostatic coating and the bell-side current when the earth is properly connected, and a magnitude relation between the earth-side current measured at the time of the electrostatic coating and the earth-side current when the earth is properly connected.

Abstract: 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.

Abstract: An electrostatic coating apparatus includes: a spray gun configured to spray a coating material onto a coating object; a voltage application device configured to apply a high voltage to the spray gun; and a current measurement device configured to measure electric current flowing through the spray gun. When the spray gun, which is in a state of not spraying the coating material onto the coating object and is under application of the high voltage from the voltage application device, is located at a distance from the coating object, the electric current flowing through the spray gun is measured by the current measurement device. A grounded state of the coating object is checked, based on the measured electric current. This shortens the time required for checking the grounded state, while allowing for downsizing and simplified configuration of production equipment and reduction of equipment cost.

Abstract: An electrostatic painting method includes supplying, via a pure water supply passage, pure water to a paint tank within which paint is stored, applying a voltage to paint that is pushed out from the paint tank by the supplied pure water, and spraying the paint to which the voltage has been applied, at an object to be painted. Pure water remaining in the pure water supply passage is replaced to increase an electrical resistance value of the pure water before starting to paint the object to be painted.

Abstract: An electrostatic coating apparatus includes a coating gun that sprays a coating material toward a coated matter, a high-voltage application apparatus that applies a high voltage to the coating gun, a bell-side current calculation unit that calculates a bell-side current to flow from the coating gun to the coated matter, an earth-side current measurement unit that measures an earth-side current to flow from the coated matter to the earth, and an earth check unit that detects an abnormal earth state of the coated matter, depending on a magnitude relation between the bell-side current calculated at the time of electrostatic coating and the bell-side current when the earth is properly connected, and a magnitude relation between the earth-side current measured at the time of the electrostatic coating and the earth-side current when the earth is properly connected.

Abstract: 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.

Abstract: A paint supply method supplies a paint into a paint cartridge by using a filling valve that has: a paint supply channel that is linkable in communication with a supply portion provided for supplying the paint into the paint cartridge; a branch channel that branches from the paint supply channel near a site of linkage in communication between the supply portion and the paint supply channel; and a trigger valve as an open-close valve of the paint supply channel which is disposed in the paint supply channel upstream of the site of linkage in communication. After a filling liquid is filled into the branch channel, the trigger valve (open-close valve) is opened, and the paint is supplied into the paint cartridge via the paint supply channel.

Abstract: An electrostatic coating apparatus includes: a spray gun configured to spray a coating material onto a coating object; a voltage application device configured to apply a high voltage to the spray gun; and a current measurement device configured to measure electric current flowing through the spray gun. When the spray gun, which is in a state of not spraying the coating material onto the coating object and is under application of the high voltage from the voltage application device, is located at a distance from the coating object, the electric current flowing through the spray gun is measured by the current measurement device. A grounded state of the coating object is checked, based on the measured electric current. This shortens the time required for checking the grounded state, while allowing for downsizing and simplified configuration of production equipment and reduction of equipment cost.

Abstract: A paint filling apparatus has a plurality of header portions, and one common manifold portion that is capable of supplying a cleaning liquid to each header portion. One side of each header portion is attachable to and detachable from a paint cartridge, and another side of each header portion is attachable to and detachable from the common manifold portion. Each header portion has a paint supply channel for filling a paint into the paint cartridge. The paint supply channel of each header portion is constructed of a piping member and a paint channel. An end portion of each header portion is linkable in communication with the inside of the paint cartridge, and another end portion thereof is linked in communication with a corresponding one of paint tanks that are provided separately for each of the paint colors. An intermediate portion of each paint supply channel is provided with a paint valve that controls the open-closed state of the upstream side of the paint supply channel.

Abstract: An electrostatic painting apparatus (1) includes: a paint gun (4) that has a bell cup (4a) serving as an atomization portion that atomizes a paint, and an air nozzle (7) serving as an air discharge portion that discharges shaping air for controlling a diffusion pattern of the atomized paint; a high-voltage generator (5) that applies a high voltage to the paint gun (4); and a controller (6) that controls the high voltage to be applied from the high-voltage generator (5), wherein the high-voltage generator (5) generates a high positive voltage.

Abstract: An electrostatic coating device and an electrostatic coating method each achieve a reduction in working hours and efficient coating at the time when layers are coated with colors. The electrostatic coating device includes a coating material cartridge that includes coating-material containers, a valve that makes a change of colors of coating materials, a common path through which coating materials are able to pass according to the change, and a cleaning circuit that cleans up the common path. The coating material cartridge is configured to be removable from a coating machine. The coating material cartridge may include individual paths respectively connected to the coating-material containers and each of which one of the coating materials passes through, and valves each connected to the common path and respectively connected to the individual paths. Each of the valves may open and close a conduit line between the common path and a corresponding coating-material container.

Abstract: A coating gun includes: a high-voltage generating device that is used to generate high voltage; an air motor that is a motor portion to which the high voltage is applied; a bell cup that is supported on a rotary shaft of the air motor and to which the high voltage is applied; a CCV unit that selectively supplies a plurality of types of coatings to the bell cup; a gun body that is a casing and that contains the high-voltage generating device, the air motor and the CCV unit; and a coupling portion that is used to couple the gun body to a robot arm and that is grounded. The air motor and the CCV unit are electrically connected to each other via a first resistor, and the coupling portion and the CCV unit are electrically connected to each other via a second resistor.

Abstract: A method of detecting a wire break in a high voltage generating device that is configured to detect a wire breakage in a low-voltage cable is disclosed. The method of a wire break includes: detecting whether a wire break has occurred in each of the lines in accordance with a combination pattern of whether the time differential value of an IM signal value of a CW circuit obtained when an operating voltage is boosted is positive, negative, or 0, and whether the time differential value of a VM signal value obtained after the operating voltage is boosted by the CW circuit is positive, negative, or 0; and identifying which of the lines is broken.