To provide a printing machine or a coating machine which securely hardens ink or varnish even through the irradiation of light with small light irradiation energy.

The highly reactive type ink printed on a paper 10 by the pre-printing face printing unit 3A, 3B or the post-printing face printing unit 4A, 4B, is hardened by light irradiated from ozoneless lamps of the light irradiating units 52, 72. A pair of rollers which come into contact with each other of four rollers constituting a water feed unit for feeding dampening water to respective plate cylinders 17 of the printing unit 3A, 3B, 4A, 4B, are rotatably driven so as to inversely slip.