Jacquard Shedding Mechanism (SLSC, DLSC, DLDC)

A Jacquard loom does not have shafts, it has individual heddles, and each heddle of the loom and corresponding warp yarn is individually controlled by the Jacquard mechanism. The lifting of each heddle was once controlled by a series of punched cards, but these systems have virtually all been replaced by microcomputer systems that control the lifting of heddles and corresponding warp yarns.

Jacquard loom was invented by Joseph Marie Jacquard in 1801. The invention of the Jacquard loom was an important step in the development of computers. The use of punched cards to define woven patterns can be viewed as an early, albeit limited, form of programmability. Thus, the Jacquard loom could be considered as the grandfather of computer-based machinery.