Toyota Jidosha Kabushiki Kaisha

Ransburg Industrial Finishing K.k.

Other

Trinity Industrial Corporation

Ransburg Industrial Fishing Kk

Kimiyoshi Nagai

Isamu Yamasaki

Michio Mitsui

Masahito Sakakibara

Shinji Tani

Hiroshi Kobayashi

Akira Kato

Atsushi Kawamoto

Toshio Hosoda

Takanobu Mori

Kengo Honma

Gunter Boerner

Josef Wittmann

Shigeki Fujiwara

Shinichi Washizu

Yasunori Asada

Gert Stauch

Akihiro Kawamoto

Tooru Yokota

Fumihiro Takase

Masayuki Umeki

Ryuta Ishikura

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.

Electrostatic coating apparatus and electric conductivity check method

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.

Electrostatic coating apparatus and grounded state checking method

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.

Electrostatic coating gun

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.

Wire breakage detecting method for high voltage generating device

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

Electrostatic coating system

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.

Electrostatic coating apparatus

An electrostatic coating system () comprising a coating gun () for spraying a coating material toward an article () to be coated, and a robot arm () for moving the coating gun () with respect to the article () to be coated wherein a voltage is applied to the coating gun (). A needle-like electrode () 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 (), is attached to the coating gun () or the robot arm ().

Total supplied current (I) and high voltage (V) supplied to a rotary atomizer head () are detected by a total current sensor () and a high voltage sensor (). Total leak current (I) in paint paths, thinner paths and air paths inside an electrostatic atomizer () is detected via a metal back plate () of the electrostatic atomizer (). When the total leak current value (I) exceeds a threshold value (I), the level Vof the high voltage applied to the rotary atomizer head () is lowered stepwise.

A rotary atomizer () has a rotary atomizing head () driven by an air motor () at a rotational speed of 4,000&#x2dc;5,000 rpm, for example. A coating material is supplied to a central portion of the rotary atomizing head () through a paint supply pipe (). The atomizer () further includes a supersonic horn () having a vibration plane () located adjacent to the outer circumferential perimeter of the rotary atomizing head (). The vibration plane () is an inclined plane gradually increasing its diameter forward. The coating material immediately after spattered from the outer circumferential perimeter of the rotary atomizing head () is exposed to supersonic vibration from the vibration plane (), and it is atomized by the supersonic vibration to particles of a uniform grain size. At the same time, the atomized coating material is driven forward.

Coating method and atomizer

A coating machineserving as a rotary atomizer comprises a hollow unrotary paint nozzle shaftprovided in the center of a motor shaftserving as its rotary shaft. The paint nozzle shaftis provided at a tip thereof with a gun-spray paint nozzleand a gun-spray air nozzleon the outside of the gun-spray paint nozzlein the diametrical direction, and a needle shaftis disposed in a paint passagein the paint nozzle shaftso as to serve as a valve mechanism for selectively supplying paint to either a bell cupor the gun-spray paint nozzle

Rotary atomizer and coating method by it

A rotary atomizing head type coating machine which is arranged to prevent occurrence of spark discharges, including a rotational shaft (,) which is formed of an insulating material, a rotary atomizing head (,) which is likewise formed of an insulating material and mounted on a fore end portion of the rotational shaft (,). An on-head semi-conductive coat film (,) is formed on outer peripheral surfaces of the rotary atomizing head (,). On the other hand, a first arcuate coat film (,) is formed on a first limiter ring (,) which is provided on a motor body (,), and a second arcuate coat film (,) is formed on a second limiter ring (,) which is provided on the rotary atomizing head (,). Further, a power supply semi-conductive coat film (,) is formed on and around outer peripheral surfaces of the rotational shaft (,) between the arcuate coat films (,) and (,). A high voltage which is applied to the air motor,is supplied to paint releasing edges (,E) of the rotary atomizing head (,) through the first arcuate coat film (,), power supply semi-conductive coat film (,), second arcuate coat film (,) and on-head semi-conductive coat film (,).

Growing community of inventors

Yokohama, Japan

Kimiyoshi Nagai