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    Electrostatic spray coating methods and apparatus
    91.
    发明授权
    Electrostatic spray coating methods and apparatus 失效
    静电喷涂方法和装置

    公开(公告)号：US3155539A

    公开(公告)日：1964-11-03

    申请号：US77531558

    申请日：1958-11-20

    Applicant: JUVINALL JAMES W

    Inventor： JUVINALL JAMES W

    IPC: B05B3/10 ,  B05B5/04 ,  B05B5/08 ,  B05B5/16 ,  B05B15/02

    CPC classification number: B05B3/1057 ,  B05B5/0407 ,  B05B5/08 ,  B05B5/087 ,  B05B5/16 ,  B05B12/1472 ,  B05B15/025

    Abstract: 941,183. Coating-apparatus. RANSBURG ELECTRO - COATING CORPORATION. Nov. 20, 1959 [Nov. 20, 1958], No. 39429/59. Heading B2B. Apparatus for the spray coating of articles comprises spraying means for forming a spray of liquid coating material particles, a plurality of sources of liquid for delivery to the spraying means, means associated with each source for controlling the delivery of liquid therefrom to the spraying means, a common operator for the delivery-controlling means selectively operable to cause delivery from any one source to the spraying means while preventing delivery from the others, and power-activated means energizable during delivery of coating material from the selected source so as in a predetermined cycle to terminate delivery of liquid from one source, and after a delay to initiate delivery of liquid from a different source. The apparatus may be arranged to supply solvent alone to the spraying means for a period after each lot of coating liquid, to clean the spray head. In the form shown in Fig. 3, paint from each of the containers 40a, 40b or 40c may be fed to an associated port delivering on to the internal face of a rotated electrostatic spraying head 10, e.g. in the case of the container 40a by means of a gear pump 41a, driven by an electric motor 43a. The flow of liquid delivered to the head through the conduit 31a is controlled by a compressed air operated on-off valve 42a, the compressed air for operating this being controlled by an air valve 45a, operated by a solenoid 51a which also controls the motor 43a. Further, a mixture of air and cleaning solvent from a pressurized container 46 may be supplied by a pipe 47 to a port delivering it to the internal surface of the head 10, and, if desired, to a nozzle directed against the external surface, the flow being controlled by a valve 48 operated by a solenoid 52. A cylindrical shroud 16 may be moved forward to surround the head 10 by a compressed air cylinder 19, the supply to which is controlled by a valve 50 operated by a solenoid 53. An electrical control panel 55 provides for operating the solenoids to deliver liquid from the one containers 40a, b or c to the atomizer while preventing delivery from the others, and for terminating the delivery of one paint to the head, supply of cleaning solvent to the head for a predetermined time, and initiating the delivery of another paint; preferably, the shroud is moved into spray-intercepting relation with the head during cleaning, and then retracted. In the apparatus of Fig. 6 a number of compressed air spray guns, such as 60a, 60c, radiate from a hub 61 which is charged to a high electrical potential by a source 73, and supported on an insulating column 62 which can be rotated by a D.C. motor 80 to bring a selected gun opposite an opening in a housing 64, the gun then being flanked by electrodes 74. Each gun is supplied by a paint line such as 75a and compressed air line (e.g. 76a) simultaneously controlled by a solenoid, e.g. 79a. The operation of motor 80 is controlled by a series of positioning solenoids 82a, b, c &c., a motor switch 83 mounted eccentrically on shaft 62, and a motor reversing switch 84. The operation of the apparatus is controlled by a series of push-buttons PB 11, 12, 13 &c. and a relay system contained in a control panel 85. On pressing one of the push buttons, the supply of paint and air to the operative paint-gun is cut off by operation of its associated solenoid 79, and the core of its associated solenoid 82 is retracted, allowing the switch 83 to initiate rotation of the shaft 62 by the motor 80. This movement is terminated by the switch 83 striking the core of another solenoid 82, which has meanwhile been protruded. The appropriate solenoid 79 is then operated to commence spraying of paint of another colour. In order to prevent the air and paint lines becoming tangled, rotation of the shaft 62 is restricted to less than 360 degrees by the switch 84, which, when it strikes a pin, not shown, causes reversal of the motor 80.

    Apparatus for spray coating articles
    100.
    发明授权
    Apparatus for spray coating articles 失效

    公开(公告)号：US2247963A

    公开(公告)日：1941-07-01

    申请号：US28176639

    申请日：1939-06-29

    Applicant: HARPER J RANSBURG

    Inventor： RANSBURG HAROLD P ,  GREEN HARRY J

    IPC: B05B5/08 ,  B05B15/12

    CPC classification number: B05B15/1244 ,  B05B5/082 ,  B05B5/084 ,  B05B5/087 ,  Y10S118/07 ,  Y10S264/45 ,  Y10S264/72 ,  Y10S425/121

    Abstract: Articles are coated by moving them in succession along a predetermined path, creating over the surface of the moving articles a high voltage electrostatic field, the lines of force of which are generally normal to such path, and spraying liquid coating material into the field so that the spray-direction possesses a substantial component parallel to the path of article travel and generally normal to said lines of force. Referring to the drawings, cabinet 10 comprises side walls 11, top 12 and floor plates 13 sup ported by posts 14, while conveyer chain 15 travels past loading station 26, below the floor of the cabinet and past unloading station 25, and carries carrier units 28 including a rod 33 extending upwardly through the opening between the two floor plates 13 of the cabinet and carrying at its upper end an electrode 35 serving as a support for article 36 to be coated. Spray guns 44 are carried on horizontal rods 43 clamped to rods 41 slidable along rods 37 and are arranged to direct a spray 46 of coating material in the general direction of the opposite end of the cabinet. A pair of tubular insulating members 47 are mounted on each side wall 11 of the cabinet and carry strung between them a fine wire electrode 48 connected to one terminal of an electrical generating apparatus, the opposite terminal of which is connected by a conductor 51 to a pair of wires 52 extending longitudinally beneath the floor of the cabinet and adapted to engage the vertical rods 33 in their travel through the cabinet and so to complete the electric circuit. The articles may, if desired, be slowly rotated to insure uniform coating. This is done by means of conveyer 64 mounted on plate 67 movable toward and away from conveyer 15 so as to bring chain 64 into and out of mesh with sprockets 31 on conveyer 15. Plate 67 has secured thereto a pin 70 carrying a T-fitting 72 which carries rod 74 passing through fixed brackets 77 to T-fitting 81 comprising stud 83 and handle 82 which can be moved so as to fit inside or outside detent 84 secured to the cabinet wall. Spring 80 acting against washer 78 held by pin 79 normally urges the chain 64 into engagement with sprockets 31 and moving of stud 83 inside detent permits this, while moving it outside the detent breaks the engagement. In a modification (Fig. 7) in which only one side of an article is to be coated, the article 136 is carried by support 133, the discharge electrode is a metallic point 148 mounted on the end of one of the insulators 47 and the collecting electrode is a plate 135 mounted on a similar support on the opposite side of the path of travel of the article 136.

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