PURPOSE: To orderly align flow of containers from plural rows to a single row by forming a combiner part on a curved travelling passage inclined into downward slope on the maximum speed side of a slat chain.

CONSTITUTION: At transferring containers 1 from a supply conveyor 2 to a combiner part 3, they are transferred in order to the outside slat chain having a higher speed by descending on downward slope and by the function of a guide 5, and spaces between them are spread. At passing through a half of a semicircular part, they are transported in the opposite direction against the down slope, transferred to the more outside slat chain having more higher speed by function of the guide 5, as 3a - 3e, and mutual spaces among the containers are further spread. Finally, a single row of spacedly arranged containers is formed and transported to a discharge conveyor 4.