Processing paper and other webs

A web-fed printing apparatus for printing a web, said apparatus comprising:

• at least one unit for containing printing medium;
• and
• a plurality of cartridges, arranged to define an array, for printing said web when said web is passed through said array;
• each of said cartridges including transferring means for transferring medium from said at least one unit to said web, said transferring means comprising at least one printing cylinder for contacting said web;
• the at least one printing cylinder of one of said cartridges having a different circumference that the at least one printing cylinder of another one of said cartridges.

A web fed printing apparatus for printing a web, said apparatus comprising:

• at least one unit for containing printing medium;
• a plurality of cartridges, arranged so as to define an array, for individually and selectively interacting with said at least one unit to print said web when said web is passed through said array of cartridges, each said cartridge including at least two cylinders disposed such that the web passes between said at least two cylinders when said web is passed through said array of cartridges, said cartridges comprising transferring means, including at least one cylinder of said at least two cylinders, for transferring said printing medium from said at least one unit to said web to print the web;
• and
• means for mounting said at least one unit and said array of cartridges so as to enable relative movement therebetween to thereby permit successive interaction of said at least one unit with the plurality of cartridges.