Patent GB-515314-A (GB)
Title: Improvements relating to can and like container coating machines
IPC: B05C3/10
Filed: 1938-05-30
Abstract: 515,314. Conveyers. AMERICANCAN CO. May 30, 1938, No. 16057. Convention date, June 24, 1937. [Class 78 (i)] [Also in Groups III and XL] Cans b from an assembling machine are stacked in a magazine A with their hinged closure elements, d in open position. Properly positioned cans are removed from the bottom of the magazine by a transversely disposed carrier C, moving intermittently, to position the cans, in say batches of six, beneath a corresponding number of pockets D. Cam-actuated lifter-devices E then raise the group of cans into the pockets D, the cans being kept therein by cam operated bottom slide gates. The pockets D are in line with parallel runways F, the cans being removed from the pockets and traversed along the runways by ring-like flights 256 attached to conveyers G, being led beneath the surface of paraffin wax, maintained at sterilizing temperature, in a reservoir H. The cans are carried out of the coating liquid with their openings towards the bottom, so that excess wax drains out; after which they are turned upright and received on a conveyer J and lowered to a 'discharge belt 337. The magazine A comprises rods 34 near the foot of which is disposed a detecting device B, the feed of cans being stopped if a can is disposed incorrectly or has its closure element d closed. The detecting device 55 comprises a photoelectric cell 56 disposed adjacent a source of light 57. As long as the cans are properly positioned and with closure element d open, the beam from the lamp 57 is prevented from entering the cell 56 and normal working goes on. But on the wrong positioning of a can the cell is activated and a conventional relay operates a switch 58 in the control circuit R, Fig. 10. Normally the switch 58 is made and the circuit 63, 58, 69, 64 is closed through the main service switch 65. The solenoid 69 is of the double pole type, and when energized. completes the circuits 63, 73, 71, 75, 64, to energize the feed solenoid 75, and at the same time break the bell circuit 63, 105, 108, 64, Provision is made however, of a circuit T whereby the breaking of the circuit R does not immediately de-energize the solenoid 69. A mechanically-operated switch 81 is included to energize the solenoid 69 and the timing is arranged so that the solenoid 69 will only be de-energized when a pair of lugs 42 on the transverse conveyer C is in a definite position at the foot of the magazine A. The switch 81 is operated by a cam 84, Fig. 5, driven from the idler shaft 45 of the conveyer C. The can feed stop solenoid 75 is provided with a movable core 92 which, on the solenoid being deenergized, effects. the positioning of a slide 101, 103 beneath the cans in the magazine to prevent feed, the conveyer C, however, continuing its intermittent motion. At other times the lugs 42 on the carrier C support the cans in the magazine. The carrier C is driven by a geneva stop disc 47 bearing rollers 48 which co-act with a driving cam 49 on the main driving shaft 51 driven by an electric motor. The cans, upon separation from the magazine, are advanced step by step by the lugs 42 through the trough 37 until a batch of, say, six, are positioned beneath a corresponding number of receiving pockets D, Fig. 4. Lifting devices E, operating as a unit are now lifted by arms 135, 136, operated from a cam 143, keyed to a sleeve 145 loosely carried on the main shaft 51, and clutchable thereto periodically by a clutch 151. This clutch is driven by a driving member 152, on the shaft 51 which through spring-biassed pawls 155, 156 normally held depressed by a movable flapper 161, is attached to drive the member 153 on the sleeve 145. The pawls 155, 156 are released for driving action by a lever 167 operated by a cam groove 169 on geneva stop disc 47. The batch of cans, lifted into the pockets D, are retained therein by pairs of horizontally slidable gates 177, 178, movable as groups by slide bars 181, actuated through arms 189 by the double cam 193 mounted on the sleeve 145. On the closing of the pocket gates 177, 178, the lifters E descend. To prevent overthrow of the sleeve 145, when clutched temporarily to the shaft 51, a two armed spring- biassed brake 211 is provided actuated by a cam projection on the rear of the disc 47 through levers 219, 221. The cans are removed from the pockets by the conveyers G and traversed through runways .comprising bars 245, twisted to effect rotation of the cans while in the molten paraffin 233 contained in a tank H, steam-heated by the jacket 238, the speed of rotation and advance allowing air to come - out of the cans as the wax flows in. As the cans emerge from the paraffin to ascend the right-hand portion of the runways, the openings of the cans are disposed in lowermost position to permit of drainage, the outflowing wax being returned to the tank H by a trough 279. Fingers 278 on the conveyers G prevent adjacent cans from coming into contact. The cans now reach the topmost point 37 of steam-heated guide rails 318,316 and are turned gradually vertically upwards to be received on flights 286 of a conveyer 285, heated in passing through a steam chamber 308, to be lowered between the rails 315, steam heated from the supply 324, 321, on to the delivery conveyer 337. On the passage through the rails 315, each can has projected against the hinged portion of its closure element, a jet of air from a cam-operated poppet valve 331, to remove any accumulation of wax which might prevent proper closuring.