Copier purchase refers to you owning your own photocopier machine and possessing all rights to it. You will get to keep the equipment for as long as you want as well as the full autonomy to decide on where, when and how to deploy your photocopier.
Owning an equipment also means that you only need to pay a finite cost to use your equipment, as opposed to the continuous month to month billing in a leasing or rental scheme in perpetuity.