Patent GB-190919943-A (GB)
Title: Improvements in and relating to Lap-seam Body Formers for Can Bodies.
Inventor: KRUMMEL LOUIS CHARLES
IPC: B21D51/28
Filed: 1909-08-31
Granted: 1910-08-25
Abstract: 19,943. Krummel, L. C. Aug. 31. Angular bending; bending dies and formers; soldering. -In forming cylindrical can bodies with soldered lap seams, the blanks are bent round a shell and are removed therefrom by contractible horns on trucks which pass through the shell to the soldering- apparatus. The shell 4, Fig. 4, which is bolted to a bracket 11, has an opening 5 for the passage of the horn B and an inturned edge 6 to prevent the blanks from passing into the shell during bending. The blanks are fed forward to rollers a, a' by hand or by a chain 17, which is operated by a sprocket-wheel 19 connected to a clutch on a shaft which is rotated by bevel-gear from the main shaft, the clutch being so operated through links by a hand-lever on a rockshaft, which also operates the main clutch on the driving-shaft, that the feed clutch is disengaged before the main clutch. The lower roller a is driven from the driving-shaft by sprocket, spur, and bevel gear, and is geared to the upper roller a<1>, which is mounted in a bracket 26, pivoted at 28 so as to facilitate removal in case of blanks jamming, and connected at its other end to pivoted bolts 29 provided with collars p and springs t, the tension of which is regulated by nuts s to suit blanks of varying thicknesses. A carrier h, which is vertically adjusted by screws j for blanks of different thicknesses and maintained in a parallel position by other screws abutting each end of the carrier, is formed with a bar f for leading the blanks into the rollers and a guide bar g for deflecting the blanks downwardly against the shell. Each horn B is of metal and is formed in two parts 47, 48, Fig. 8, which are held together by springs 50, the part 47 being connected to a post 45, Fig. 6, and fixed to to the base A of a truck, and the part 48 being pivoted and expanded by a taper pin 53, which engages the heads of the screws 55 and is operated by a bell-crank lever 56, normally pressed inwards by an adjustable spring 61, but having a roller 59 adapted to engage a raised part of the bed when the horn is to be collapsed. The trucks carry shoes 40 for sliding in shouldered ways on the bed, and rollers 37 for engaging notches in the sprocketwheels L, and are connected to similar intermediate links C to form a complete chain. A gauge 30 engages the front of the blank during bending to maintain the edges parallel and slightly separated and to fix their position. When the bending is completed, the post 45 in its motion removes the blank from the shell, and arms D, D<1> are moved inwards by rollers 62 engaging tracks 101 to grip the blanks. The gripping-die 65 is adjustable, and the rollers 62 are eccentrically mounted to adjust for lost motion and for holding the bodies tighter. The body then comes under a felt pad or roller fluxing-head and, after being supplied with a solder strip fed by ratchet and spur gear, comes under the soldering-iron. In order that the portion to be soldered can be easily heated, an air space 67 is formed in the horn, and one side of the seam is made to overlap the air space, Fig. 10, the overlapping portion remaining cool and preventing solder from reaching the interior of the can. The body then passes under a wiper of felt or other material, next through a reheater, the lap being held down by a spring bar, and is then passed under a cold air blast. The arms D, D<1> are then swung away from the horn by a depressing-track, and the horn is collapsed. The can bodies are then stripped from the horn by fingers on endless chains engaging grooves 85 in the horn and moving at a quicker speed than the trucks, a bridge-piece below each horn preventing the body from tilting. Tracks are provided on the underside of the machine for supporting the trucks.