Patent GB-298074-A (GB)
Title: Improvements in machines for applying a semi-liquid lining-compound to can-ends
IPC: B21D51/46
Filed: 1928-08-21
Abstract: 298,074. Hothersall, J. M. Oct. 1, 1927, [Convention date]. Coating-machines.-In machines for applying a gasket of liquid or semi-liquid lining-material upon the flanges of can-ends held in chucks which travel about a common axis above an annular source of lining-compound, the cam-ends are fed in succession from a feeding-station to chucks mounted above dies which are normally disposed within the reservoir containing the lining-compound, and are movable towards the can-ends to apply the gasket to their flanges. The can ends are presented to the chucks in an inverted position and are subsequently reversed so that, during drying, their upwardly-extending flange prevents the lining compound from flowing. Means are also provided to prevent the application of the lining-compound to a chuck not containing a can-end. The turret, mounted upon a vertical post 23 on the machine base, comprises a central hub mounted on ball-bearings 27 and provided with webs 25 carrying an outer rim 24. The annular tank or trough 45 is cast around the turret, and the die 51 of each unit is mounted in a carrier 52 supported on a vertically slidable member 53 which is provided at its upper end with a cam roller 58 engaging a cam groove 59 formed around the periphery of a stationary cam body 54 secured above the turret, on the post 23. the arrangement being such that, at the lining- applying station, the die is lifted from the lining- compound. The chuck is magnetically operated and comprises a winding 64 upon a core 61 secured upon a sleeve 62 and enclosed by a housing 65 which is open at its bottom end. Current is supplied to the chuck by leads connected to slip-rings which are engaged by contact brushes 195, 196. The upper end of the chuck sleeve 62 is connected to a block 72 carrying a cam roller 73 which engages a cam groove 74 in the member 54 to effect the positive lifting of the chuck, and a spring 77 between the upper end, of the sleeve and a top plate 75 allows the chuck to yield under the pressure of the die when the lining-compound is applied. A member 48 supported by a rod 81 extending upwardly through the chuck sleeve 62 is arranged to engage the countersunk portion of the can-end before the latter is picked up by the chuck, and subsequently acts to remove the can-end from the chuck after lining. The upper end of the rod 81 is provided with a head carrying a. cam roller 83 engaging a cam groove 84 in the member 54 to raise and lower it. The can-ends are fed from a magazine 91 by a sliding member 93, which is reciprocated in guides 94 by linking it to a rocking member 96 actuated by a crank 98. The bottom can-end of the stack normally rests upon a ledge, and means are provided to raise the other can-ends from it to enable it to be engaged by a flat member 112, Fig. 10, fixed on the upper face of the slider 93. A bevelled edge 113 on the member 112 co-operates with an overhanging plate 114 secured upon it to form a groove which engages the can-end. A cam face 131 on one side of the member 112 controls the action of a pivoted hooklike member, which it rocks to lift the stack of can-ends, the weight of the stack serving to return the lifted member and drop another can-end into the ejecting position. The forward movement of the slide carries the can-end on to an extension plate 135 disposed over the tank 45 and between the paths of the chucks and dies. In this position it is engaged by the member 48 and swept along the plate, whereupon a chuck descends, picks it up, and carries it forward, the die then being raised to apply a gasket of lining-compound upon it, after which the die returns beneath the lining-compound in the tank. The can-end is deposited upon a transfer disc 151, where it is engaged by one of a series of fingers 154 on a rotating disc 153, and is swept around to an inverting-mechanism. The inverting-mechanism comprises a, turret rotating intermittently in a plane at right-angles to the plane of the disc 153 and carrying a series of slotted arms which receive the can-ends and deliver them on to a conveyer 182 after carrying them through an arc of 180‹. The means for preventing the application of lining-compound to a chuck not carrying a can-end comprises a lever 255, Fig. 1, pivoted at 256 and pulled by a spring 257 into the path of travel of the cam-ends, a series of links being.connected to the lever 255 and actuating a sliding member 214, Fig. 3, controlling a pivoted dog which prevents downward movement of the chuck.