What rotating machine did Leonardo da Vinci design to produce a continuous supply of threads?

Leonardo da Vinci designed a spinning machine to produce a continuous supply of threads.

Textile production was an important area of Renaissance mechanical innovation, and Leonardo studied ways to automate repetitive work. His spinning-machine concepts used coordinated moving parts to draw, twist, and wind fibers. The goal was to increase regularity and output compared with entirely manual spinning.

The design is sometimes confused with a sewing machine because both are associated with thread. They perform different tasks. A spinning machine turns loose fibers into yarn or thread, while a sewing machine joins fabric with thread. Leonardo’s studies addressed the earlier stage of textile production.

Leonardo’s engineering notebooks frequently combine practical workshop knowledge with mechanical analysis. His textile devices were concepts and experimental designs, so they should not automatically be credited as the direct origin of later industrial spinning machinery. They are significant because they show his early interest in mechanizing production and coordinating repeated motion.