Metal working – Means to assemble or disassemble – Means to interrelatedly feed plural work parts from plural...
Patent
1996-07-24
1998-04-14
Gorski, Joseph M.
Metal working
Means to assemble or disassemble
Means to interrelatedly feed plural work parts from plural...
72 49, B23P 2100, B21C 3712
Patent
active
057378320
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention concerns improvements in machines for the formation of helical lock-seam tubing, and relates more especially to such a machine adapted for the production of such tubing having a multiple wall thickness.
It has hitherto been proposed, see FR-A-2,032,737 and FR-A-2,107,500, to provide helical lock-seam tubing having a multiple wall thickness. Hitherto, however, the production of a machine capable of forming such tubing has proposed practical difficulties.
It is accordingly an object of the invention to provide such a machine.
SUMMARY OF THE INVENTION
In accordance with the invention there is provided a machine for the formation of helical lock-seam tubing, characterized in that it comprises means for guiding at least two superposed metal strips in overlapping relationship successively between a series of forming rollers wherein flanges are formed upon the opposite marginal edges of the superposed strips, whilst overlapped upon one another, a pair of drive rollers for causing the superposed strips to be drawn through the forming rollers and then advanced towards a helical forming head, and clinching rollers associated with the helical forming head such that the flanges formed at the respective marginal edges of the overlapped metal strips are clinched into locking engagement with one another to provide a helical locked-seam, consecutive helices of which are spaced apart by a distance corresponding to the width of the overlapped metal strips.
Various further optional features may be incorporated in the machine, in accordance with the invention, in order further to improve the effective handling of the overlapped strips.
Thus, according to one aspect of the invention guide rollers between which the overlapped metal strips are fed to said forming rollers are provided with radially stepped shoulders so arranged that the strips passing between the rollers are held with their widths in a staggered relationship to one another, the distance of lateral displacement being so selected that relative displacement of the edges of the strips during forming of said flanges and clinching of said lock-seam brings the lateral edges of the respective strips to lie in a substantially common plane. The shoulders of the guide rollers may be adapted to provide for the location of two overlapping strips or three, or possibly more overlapping strips.
According to another aspect of the invention, the drive roller that is arranged for gripping engagement with the exposed surface of that one of the overlapping strips that is to be at the exterior surface of the finished tubing has a knurled or patterned surface. Thus the arrangement of drive rollers is the reverse of that which is utilized in the conventional machine for forming lock-seam tubing.
In accordance with a yet further aspect of the invention, there are provided at the entry to the helical forming head of the machine, one or more shaped counter-pressure plates including portions shaped to the radius of curvature of the internal surface of the finished tubing, whereby the overlapping metal strips are held closely in contact with one another during initial bending to the radius of curvature of the helical forming head.
In order to feed helically coiled strips from supply reels, in overlapping relationship, to the rollers and the forming head of the machine, independent supply reels carrying the respective strips may be arranged one behind the other in the direction of advance of the strip towards the machine, in such a manner that the strip fed from the reel more remote from the machine is brought into contact with the next adjacent strip substantially at a point where the path of the first strip becomes tangential to a radius of the reel feeding the next adjacent strip.
In an arrangement where three individual strips are to be fed to the said guide rollers of the machine from corresponding supply reels, preferably there is interposed between that supply reel nearest to the machine and said guide rollers, a guide arrangement for main
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Gorski Joseph M.
Protol A.G.
Smolowitz Martin
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