The Wonder Book of Knowledge: The Marvels of Modern Industry and Invention, the Interesting Stories of Common Things, the Mysterious Processes of Nature Simply Explained
History
The Wonder Book of Knowledge: The Marvels of Modern Industry and Invention, the Interesting Stories of Common Things, the Mysterious Processes of Nature Simply Explained
Industrial arts -- History
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.
[Illustration: 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.
American Hemp.
Public-domain text, read in full here on John Shaqi.
Reviews
Reviews
No reviews yet
Be the first to share your thoughts on this work.
Elsewhere in the archive
Join the Discussion
Join the discussion
Sign in to leave a comment or review.
Sign InorCreate an account