gearing 130 which may be acted on by an auxiliary motor 131 enabling the synchronisation of the drive the shaft 127 also has a further gear 132 which connects to a worm 133 acting on a worm wheel 134 the worm wheel turns a shaft 135 at one end of which is a linear actuator 136 and at the other end of which is a clutch 137 the clutch 137 connects to a shaft 138 which drives a plate cylinder 116 of one of the cartridges 111 112 113 114 thus the drive to the cartridge of this embodiment is generally similar to that described with reference to fig5 and its operation will therefore be immediately apparent as shown schematically on the right hand side of fig9 the shaft 127 may also extend to the opposite edge of the carousel 115 to drive another inking and dampening unit not shown a further development of the arrangement shown in fig4 or fig7 or 8 and 9 is concerned with the mounting of the cylinders within the cartridges 40 41 42 100 101 102 103 or 111 112 113 114 clearly if the cylinders were mounted in a conventional manner each time a cartridge is required to be changed the printing positions would require precise and lengthy re setting therefore the third aspect of the present invention concerns an arrangement for moving the blanket cylinders easily into and out of their.