 So it is not economical to purchase Jacquard machines if one can make do with a dobby mechanism.As well as the capital expense, the Jacquard machines are more costly to maintain, as they are complex and require higher skilled personnel; an expensive design system is required to prepare the designs for the loom, and possibly a card-cutting machine.Weaving is more costly since Jacquard mechanisms are more likely to produce faults than dobby or cam shedding.