Patent GB-916760-A (GB)
Title: Improvements in or relating to tube feeding mechanism
IPC: B21C37/08
Filed: 1961-04-12
Abstract: 916,760. Drawing. CONTINENTAL CAN CO. Inc. April 12, 1961 [May 24, 1960], No. 13187/61. Class 83 (4). A tube driving mechanism comprises a pair of endless drive chains having opposed runs, means supporting and driving said chains in unison, a plurality of jaws carried by each of said drive chains with said jaws being arranged in opposed aligned relationship when passing along said runs, and means mounting said jaws for pivoting relative to said drive chains in the plane of said runs, said jaws being disposed in advance of and offset from said mounting means whereby the resistance to movement of a tube increases the clamping force of the jaws on the tube. The mechanism is mounted on a frame F which includes a pair of beams 16 and 17 connected by a pair of plates 18 and 19. Longitudinally extending plates 22 and 23 are mounted on the plates 18 and 19 and are connected at their upper edges by further plates 24, 25 and 26. The mounting of the plate 24 is further strengthened by gussets 27 and it adjustably supports bearing assemblies 28 and 29 in which are journalled idler shafts 30 and 31 carrying sprockets 32 and 33 equally spaced on opposite sides of a tube T which is to be driven by the mechanism. The plate 26 also carries bearing assemblies 34, 35 which support drive shafts 36 and 37 on which are mounted sprockets 38 and 40 respectively. Intermediate idler sprockets 45 and 46 are mounted on shafts 44 which are supported by bearings 43 carried on the plate 25. The idler sprockets 32 and 33 are spaced further from the centre-line of the tube T than the drive sprockets 38 and 40, so that driving chains mounted thereon converge on to the tube and then run parallel to it between the intermediate idler sprockets 45 and 46 and the drive sprockets 38 and 40. A drive chain 47 is entrained over the sprockets 32, 45 and 38 and a similar chain 48 over the sprockets 33, 46 and 40. Guide members 49 and 50 are provided, one for each chain and comprise a plate which bears on the chain rollers and is adjustable vertically and horizontally. At the lower end of each shaft 36 and 37 is a sprocket round which passes a chain which also passes round a slack adjusting idler sprocket and round a further sprocket fixed to a shaft which is driven by V-belts and pulleys from a variable speed reduction unit. The arrangement is such that the shafts 36 and 37 rotate at equal speeds in opposite directions so that the opposed runs of the chains 47 and 48 travel in the same direction. The tube T is engaged by a number of jaw assemblies 88 which are mounted on the drive chains. Each chain is a standard roller chain with the exception that at spaced intervals an upper and lower outer link plate 91 is provided with a lug 93, 94. Each jaw assembly 88 comprises a mounting bracket 95 which includes an upper plate 96 and a lower plate 97 which have lugs 98 and 100 respectively, and a C-shaped plate 101 which has fasteners 105 extending from an upper leg 102 and a lower leg 103, and by which each jaw assembly is secured to its driving chain. Each jaw assembly also includes a jaw 106 which is carried by a support 107, that has an end portion 108 of reduced thickness and which is pivotally mounted between the plates 96 and 97 by a bushing 110 and a pin 111. In the end part of the portion 108 is an arcuate slot 112 through which passes a second pin 113 carried by the plates 96 and 97. A bore 114 in the support 107 contains a spring 115, the projecting end of which abuts a part 104 of the plate 101. The inner surface of the jaw 106 is lined with resilient material which grips the tube T without damaging it.