Apparatus for dispensing conductive coating materials

Apparatus for dispensing electrically conductive coating material, comprising:

• a number of sources of electrically conductive coating material of different color;
• at least one coating dispenser operative to dispense coating material when closed and to terminate the flow of coating material when opened;
• first transfer means for receiving coating material from said at least one source;
• color changer means interposed between said sources of coating material and said first transfer means for selectively supplying coating materials of different color to said first transfer means;
• second transfer means for receiving coating material from said first transfer means, and for transmitting the coating material to said at least one coating dispenser;
• electrostatic charging means for applying an electrostatic charge to the coating material which is supplied to said at least one coating dispenser from said second transfer means;
• first voltage block means for electrically isolating said first transfer means from said electrostatic charging means while said first transfer means receives coating material from one of said sources of coating material, and for electrically isolating said second transfer means from said at least one source of coating while said second transfer means receives coating material from said first transfer means;
• a second voltage block means connected between said at least one coating dispenser and said electrostatic charging means for supplying charged coating material to said at least one coating dispenser when said at least one coating dispenser is opened to dispense coating material, and for electrically isolating said at least one coating dispenser from said charged coating material, when said at least one coating dispenser is closed to terminate the flow of coating material.