What machine did Leonardo da Vinci design to wind thread onto a bobbin?

Leonardo da Vinci designed an automatic bobbin winder to place thread onto a bobbin.

The machine belongs to his studies of textile production, where he sought to reduce repetitive manual labor and make manufacturing more regular. A bobbin winder must guide thread while rotating the bobbin, distributing the material instead of allowing it to gather in one uneven mass.

Leonardo’s interest in textile machinery extended beyond winding. He also drew devices related to spinning, weaving, and preparing fibers. These designs show how closely his engineering work connected mechanical motion with the organization of workshop labor.

The bobbin winder should not be confused with a spinning wheel, which twists fibers into thread, or a loom, which interlaces threads into cloth. Its specific task was winding already-produced thread onto a bobbin.