OP wants to be able to: By Schedule, Block Internet but Allow LAN (say for local network printing)....
I am not sure this can be done. So far as I have seen, the Access controls settings block all network access, or it blocks SOME access according to Website filter table, and/or by a pre-defined time schedule.
Intuitively, you should think blocking internet while allowing for local LAN access would be a no-brainer, but the DIR-655 may well NOT support this concept.