What Leonardo da Vinci textile machine was designed to wind thread onto bobbins automatically?

Leonardo da Vinci designed an automatic bobbin winder for winding thread onto bobbins.

A bobbin winder prepares thread by transferring it onto a small spool in a regular, controlled way. Leonardo’s design applied mechanical motion to a repetitive textile task, illustrating his interest in improving manufacturing through automation.

Textile production was an important industry in Renaissance Italy, and winding thread accurately could affect later stages such as weaving and spinning. Leonardo’s machine belongs to a wider group of studies involving gears, cams, shafts, and coordinated motion.

The device should not be confused with a spinning wheel, which twists fibers into thread, or a loom shuttle, which carries thread through the warp. A bobbin winder handles already formed thread and organizes it on a spool. Leonardo’s design was a mechanical concept rather than a documented factory installation.