Abstract: A method and a device are disclosed for conveying products longitudinally respecting a particular longitudinal spacing. Between two conveyor surfaces moving at a particular speed equal to the product of an at least average particular rate of arrival of products by the particular spacing, the products rest on a second conveyor surface moving at a speed that is systematically oscillated around a particular speed at a rate equal to the particular rate. The products can therefore be set or maintained at the particular spacing and if a plurality of rows of products are processed simultaneously they can be set in phase or with a particular phase shift.