Ngesiphakeli esinembile, umshini omusha wokucwebezelisa oklanywe ngokuzenzakalelayo futhi ngokuqhubekayo uphakela iphepha, uqinisekisa ukuhanjiswa okushelelayo kwephepha losayizi abahlukahlukene. Ngaphandle kwalokho, lo mshini uhlinzekwa ngomtshina onamashidi amabili. Ngetafula lesitoko, iyunithi yokuphakela iphepha ingangeza iphepha ngaphandle kokumisa umshini, okuqinisekisa ukukhiqizwa okuqhubekayo.