Q: Canon Image Runner C2220i

Morning All

We use a network with domain and 3 iMac are connected inside, not in domain.

There are two printers in the network Canon IR 5250 and the Canon IR C2220i,

The iMac users cannot prit using Wi-Fi from computers, is a strange behaviour because

is possible see trought the System Preferences but cannot add to the printers,

specially the C2220i

Anybody connect the printer trought Airport Express via USB to printer...???

Thanks in advance for any information

Kindest regards