Electrostatic coating machine

1. An electrostatic coating machine comprising:

an air motor having an electric potential which is maintained at a ground level and that rotates a rotational shaft with compressed air supplied;

a rotary atomizing head that is provided on a front side of said rotational shaft and is composed of a tubular body having an electric potential which is maintained at the ground level to spray paint, which is supplied while being rotated by said air motor, from a releasing edge in a front end;

an external electrode member that is positioned in back of said rotary atomizing head and is provided on an outer peripheral side of said air motor to electrify paint particles sprayed from said releasing edge in said rotary atomizing head to be in a negative potential by applying a negative high-voltage generating corona discharge to a plurality of electrodes; and

a shaping air spurting member that is formed in a tubular shape by using a conductive material and is arranged on an outer peripheral side of said rotary atomizing head in a state where a front end is positioned in an intermediate section of said rotary atomizing head in a length direction, the front end being provided with a plurality of air spurting holes over an entire circumference in a circumferential direction to spurt shaping air toward paint particles sprayed from said rotary atomizing head, wherein

a shield member formed of a conductive material is provided on an outer peripheral side of a front side section of said shaping air spurting member and is formed of an annular body radially extending to shield electric flux lines traveling toward said releasing edge of said rotary atomizing head from each of said electrodes in said external electrode member.

2. The electrostatic coating machine according to claim 1 , wherein

said shield member is formed as a flange-shaped member that extends from an outer peripheral side of said shaping air spurting member.

3. The electrostatic coating machine according to claim 1 , wherein

said shield member is formed to be integral with said shaping air spurting member and an electric potential of said shield member is maintained at a ground level through said shaping air spurting member.

4. The electrostatic coating machine according to claim 1 , wherein

said shield member is provided to be separated from said shaping air spurting member, and is mounted in a state of being connected electrically to an outer peripheral side of said shaping air spurting member.

5. The electrostatic coating machine according to claim 1 , comprising:

a coating machine support body that is provided on an outer peripheral side of said air motor to surround said air motor and extend closer to the rearward than said air motor, wherein

said external electrode member includes:

an annular external electrode support tubular body that is provided on an outer peripheral side of said coating machine support body and is formed of an insulating plastic material; and

said plurality of electrodes that are arranged in a circumferential direction on the front side of said external electrode support tubular body.

6. The electrostatic coating machine according to claim 1 , comprising:

a cover member that is provided between said external electrode member and said shaping air spurting member, said cover member being formed in a tubular shape by an insulating material and surrounding said air motor.

7. The electrostatic coating machine according to claim 1 , wherein

a relation of a diameter dimension E of said shield member to a diameter dimension D of said releasing edge in said rotary atomizing head is 1.4D≤E≤3.0D.

8. The electrostatic coating machine according to claim 1 , wherein

an axial distance dimension L between said releasing edge of said rotary atomizing head and a front surface part of said shield member is 1 mm≤L≤50 mm.