USB Print Servers let you connect a "Printer" to the Local Area Network. I have a Linksys one with an inkjet printer attached. What they may not support is the additional features of an "All-In-One device", i.e. Scanning, Copying etc.
The software for my Print Server creates a Virtual Printer Port, which is fine for a "printer" but a "scanner" cannot be used with this port.
I'm not saying that what you require isn't available, but be very careful to check that what you do find will provide the full functionality of an all-in-one.