Abstract: A device for forming rows of products includes a photoelectric cell that is positioned in proximity of an element, downstream of the said supply line, against which the first infed parcel abuts, and upon being tripped actuates product blocking means located upstream of the said abutting element, at a predetermined distance greater than the dimension, or greater than a whole multiple of the dimension, of the parcel measured along the infeed direction. Placed above the terminal part of the supply line is a thrust element designed to displace horizontally the parcel, or row of parcels, to a waiting station where the batch is gradually formed. The said thrust element is constituted by a pair of arms supported cantilever fashion at the extremity of a lever rotatable around a horizontal axis parallel to the infeed direction, each arm extending vertically and resting at the rear of the said parcel at the time of its bottom horizontal travel, and rotating backwards at the time the parcel is released.