What textile machine did Leonardo da Vinci design to automate the twisting of silk thread?

Leonardo da Vinci designed a silk-twisting machine to automate the twisting of silk thread.

Leonardo devoted substantial attention to textile machinery, an important part of the economies of Renaissance Italy. His drawings include mechanisms for twisting and winding silk, using gears, spindles, and rotating components to make production more regular and efficient.

The machine was intended to reduce the labor required to prepare thread and to improve consistency. Leonardo’s studies often break a complex manufacturing process into linked mechanical actions, allowing one motion to drive several others.

These designs are sometimes confused with his self-propelled cart because both use sophisticated gearing. They served different purposes: the cart was a theatrical or programmable vehicle, while the silk machinery addressed industrial production. Not every textile drawing was built, but the surviving designs show Leonardo’s close interest in mechanized manufacturing.