Abstract: For printing continuous woven label stock (i.e. a web consisting of a plurality of woven labels connected together end-to-end) a printing machine comprises a support which supports the label stock and progresses it past a printing station having a printing head including a printing roller adapted to be rotated in synchronism with the moving stock sufficiently for a single printing operation upon passage of each label, driving of the printing head being initiated by a sensor which senses a datum mark on each label. For printing a plurality of colors, there may be a number of such printing heads, driving of each successive one of such printing heads being initiated by rotation of the preceding printing head.