Debashishji, some printers like the multifunction ones that have copier and fax in it can also work independently.
Depends on what you treat the item as. What is only a printer cannot work without computer and is an integral part of the computer system @ 60%. In that respect any peripheral that cannot work without drivers installed in a PC are part of the PC.
An all in 1 can be used even without the PC as a xerox machine or a fax. The only functions depending on PC with drivers is scanning and printing. In MY VIEW even if this is the case I would still take it in the computer block as most of them have ability to be remotely connected to a network and can be accessed in the network via a client PC only. finally the essential function is printing and scanning that requires PC. Even Fax requires PC if the faxing job is not a printed output but done through software itself. Essential character of the equipment is printing and that cannot be done without PC.