The Collaborative International Dictionary of English v.0.48:

Sweeper \Sweep"er\, n.
   One who, or that which, sweeps, or cleans by sweeping; a
   sweep; as, a carpet sweeper.
   [1913 Webster]

         It is oxygen which is the great sweeper of the economy.
                                                  --Huxley.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sweeper
    n 1: an employee who sweeps (floors or streets etc.)
    2: a cleaning implement with revolving brushes that pick up dirt
       as the implement is pushed over a carpet [syn: carpet
       sweeper, sweeper]
    3: little-known nocturnal fish of warm shallow seas with an
       oblong compressed body