Machine-made Ropes.
The old ropewalk is today largely obsolete, the rope-making machine taking the place of the hand-making process, which was not adapted to produce the large cables which in time were called for. Steam-driven machines were first introduced about 1838. These are now used alike in making fine threads and yarns and in large ropes.
There are two methods in the modern system of rope making. In one the strands are formed on one type of machine and twisted into a rope on another. In the second method both operations are performed on a single machine. The latter saves space, but is not so well fitted for large ropes as the former. A plant for the two-part method comprises two or more horizontal strand-forming machines, several bobbin frames, and a vertical laying-machine. The former twists several strands into a rope, the latter several ropes into a cable.
The yarns, which are wound around bobbins, are drawn from them through perforated plates, these so placed that the yarns converge together and pass into a tube. In this they are compressed and at the same time twisted by the revolution of a long carriage or flyer, which can be made to vary in speed and direction. After being twisted the strands are wound around reels in readiness for the second, or laying process.
In this the full reels are lifted by overhead chains and are placed in the vertical flyers of the laying-machine. Here again the strands are made to pass through openings and converge into a central tube, through which they pass to the revolving flyers, which perform the final duty of twisting them into rope. The finished product is delivered to a belt-driven coiling reel on which it is wound.
Removing Reel with Completed Strand from Forming Machine
The most complete rope-making machine yet reached is that in which these two machines are combined into one. It economizes space, machinery and workmen, and also is more rapid in reaching the final result. But there are disadvantages which render it unfit for the larger sizes of rope, and it is therefore used only on a limited range of sizes.