Makina onyamula mawilo amagetsi omwe amagwiritsidwa ntchito m'thumba logawira mawilo, makina osankhira mawilo ndi zida zomwe zimagwiritsidwa ntchito pamakina otumizira lamba kapena makina otumizira ma roller.Mawonekedwe a kamangidwe kameneka ndikutsata katundu wotumizidwa molondola komanso mosasunthika komanso kuyika malo osankhika pamalo aliwonse mbali zonse za mizere yolumikizira mosavuta kuti akwaniritse makasitomala ndi zofunikira zosiyanasiyana.
Ma roller conveyor ndi mtundu wa lamba wonyamula womwe umagwiritsa ntchito zodzigudubuza - masilindala ozungulira mozungulira - kulola kuti zinthu ziziyenda pamwamba pake.Amasuntha zinthu kuchokera kumalo ena kupita kumalo ena, ndipo nthawi zambiri amagwiritsa ntchito mphamvu yokoka kapena kugwiritsa ntchito ma injini ang'onoang'ono kuti atero.