|Assuming the printer and photocopier you mentioned are network capable.|
A SOHO Router with 4 LAN ports would fit your needs. The external (internet) connection from ADSL goes into the WAN port. All network capable clients (including the computer) should be set to get their TCP/IP settings automatically (from DHCP) and then be plugged into the LAN ports.
If you have more than 4 clients, get a small 8 port switch and plug it into a LAN port and then plug clients into it and the remaining LAN ports.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.