A carpet weaving loom comprises one or more tuft forming units (1), each of which is capable of supplying yarn tufts (26) of a number of different colours to a number of different weaving points sequentially. The or each of the tuft forming units (1) includes a demountable yarn carrier (2). In this way, when it is required to change the design of carpet being woven, or the creel (3) is exhausted, the or each yarn carrier (2) is simply replaced by another fed from a different creel (3). Preferably the creel (3) associated with the or each set of yarn carriers is itself removable from the remainder (6) of the loom and replaceable with the yarn carriers (2).