Wireless printer not visible on wired network

Dear All,

I have a problem with my printer. I have a Epson Stylus sx600fw. It is connected to a home network together with 4 desktops. the 4 desktops are wired to the router and the printer is connected via WiFi. For some reason de router recognises the printer and assigns it an Ip-address. But the wired computers cannot connect to it. I tried prety much everything I could thinkt of. All computers that connect to the wireless network can see the printer and use it. But for some reason the wired computers can not. EpsonNetConfig recognises it but can't see an Ip-address and therefore can not use it, it can however send config data to the printer,

what can I do to make all the desktops use the printer?

kind regards, Tom