GB901391A - Apparatus for producing tubes with a helical welding seam - Google Patents

Abstract

901,391. Making helically seamed tubing. KUCKENS, A. Dec. 23, 1958, No. 41478/58. Classes 83 (2) and 83 (4). A machine for producing tubing with a helical welded seam from steel strip coming from a reel to a shaper or die extending obliquely to the feed of the strip to coil the same is characterized in that the reel rests on a strip feeder roll assembly and is driven by contact therewith. Strip la from a reel 1 resting on and driven by a take-off roll 8 and braked by means 10, is fed by the roll 8 and a counter roll 9 through guides 15, 15a to a coiling die 2, the axis of which is inclined to the axis of the reel 1. The tube thus formed in the die 2 by coiling the strip 1a is welded at its helical seam by outside and inside welding means 16 and 16a. The completed tubing may be severed into lengths as described in Specification 901,393 to which reference is made. In a modification, Figs. 2 and 4, the reel 1 rests on two take-off rolls 17a, 17b, or a single roll 17c, Fig. 3 (not shown), resting on a driven feeder roll 18 and the strip 1a is fed by the roll 18 and a counter roll 19 through guides to the coiling die 2. Between the feed rolls and the die edge, trimming cutters 27, 27a are provided and a welding device 25 for welding the rear end of one strip and the front end of a succeeding strip. A feeder plate 24, normally supported on rolls 23, can be introduced, for example by hand, between the rolls 18, 19 to feed the rear end of a strip up to the welding device 25, the rolls 18, 19 then being reversed to return the plate 24. To control the gap 1a<SP>1</SP> between adjacent edges of the wound strip, a gauge 28, engaging an edge of the strip 1a as it is fed to the coiling die, controls a motor 29 which, through rack means 30 rocks a frame 31, carrying the reel 1 and feed means about a pivot D to correct the entry angle of the strip 1a into the die 2. A pair of feelers 32 on the die 2 engage the edges of the strip which form the welding gap and control a motor 33 laterally to move the finished tube. The feelers 32 may control the motor 29. Specification 901,392 also is referred to.