Power rake 1
I hope you mean a blower.
A power rake, has a bunch of tines that rotate to dethatch and dig up old dead grass, etc. Bu then you have to go back over it with a lawn mower with a grass bag or manually rake up all that it dug out. Its good for your lawn to do this once in a while. You can rent these things also. Mine is about 30 years old, my dad gave it to me about 5 years ago.