Leonardo da Vinci designed a spinning machine to twist thread mechanically and speed textile production.
Spinning turns loose fibres such as wool or flax into yarn by drawing them out and adding twist. Leonardo's textile studies explored wheels, spindles, and automated motion so that a machine could perform work traditionally done by hand. His drawings show how gears and rotating components might coordinate the process.
The design belongs to Leonardo's broader interest in mechanising repetitive labour. Textile technology was economically important in Renaissance Europe, and improvements in spinning could increase the quantity and consistency of yarn available to weavers.
Leonardo's spinning concept should not be confused with a loom, which interlaces already-spun threads to make fabric. It was also not the later spinning jenny, developed in eighteenth-century Britain. Leonardo's machine was a Renaissance proposal, not an industrial system proven to have transformed production.