A warp and a weft are needed for weaving. The warp is set in 1 or more colours.
Every warp yarn individually passes through a “heddle” ,that is a vertical eyelet on a shaft, and then through a reed. The shafts rise up and down making space to facilitate the weft. The sequence of lifting the warp threads up and down on the shafts form the pattern of the weave.
The best-known pattern of a Dobby is the chequered tea towel. The Dobby loom usually has 4 to 16 shafts, but also up to 32 shafts, with which patterns can be woven at high speed.