Sorting system for parcels of the parcel or packet type, comprising: a first parcel conveyor which is suitable for conveying the parcels in series in a particular conveying direction, a second parcel conveyor of the loop conveyor type that extends above a plurality of sorting outlets and is suitable for conveying the parcels in series, said second conveyor being a conveyor which has trays distributed in series and has constant pitch, characterized in that said first and second conveyors each comprise a contiguous and parallel conveying portion by means of which the first conveyor feeds the second conveyor with parcels, said trays being pivotable between a position which is tilted downward in the conveying direction and a position which is straightened to the horizontal and comes flush with the first conveyor, and in that said sorting system comprises - a first mechanical element which is designed to engage with the trays when they enter said contiguous conveying portion of the second conveyor in order to make said trays pivot to the horizontally straightened position, - an injection device which is mounted on said conveying portion of the first conveyor and comprises piston pushers which are suitable for being moved in said conveying direction opposite to and synchronously with the trays of the second conveyor and for being moved transversely with respect to said first conveying direction so as to transfer the objects from the first conveyor onto the trays by translation, and - a second mechanical element which is designed to engage with the trays when they leave said contiguous conveying portion of the second conveyor in order to make said trays pivot in a tilted position. a first parcel conveyor which is suitable for conveying the parcels in series in a particular conveying direction, a second parcel conveyor of the loop conveyor type that extends above a plurality of sorting outlets and is suitable for conveying the parcels in series, said second conveyor being a conveyor which has trays distributed in series and has constant pitch, characterized in that said first and second conveyors each comprise a contiguous and parallel conveying portion by means of which the first conveyor feeds the second conveyor with parcels, said trays being pivotable between a position which is tilted downward in the conveying direction and a position which is straightened to the horizontal and comes flush with the first conveyor, and in that said sorting system comprises - a first mechanical element which is designed to engage with the trays when they enter said contiguous conveying portion of the second conveyor in order to make said trays pivot to the horizontally straightened position, - an injection device which is mounted on said conveying portion of the first conveyor and comprises piston pushers which are suitable for being moved in said conveying direction opposite to and synchronously with the trays of the second conveyor and for being moved transversely with respect to said first conveying direction so as to transfer the objects from the first conveyor onto the trays by translation, and - a second mechanical element which is designed to engage with the trays when they leave said contiguous conveying portion of the second conveyor in order to make said trays pivot in a tilted position. - a first mechanical element which is designed to engage with the trays when they enter said contiguous conveying portion of the second conveyor in order to make said trays pivot to the horizontally straightened position, - an injection device which is mounted on said conveying portion of the first conveyor and comprises piston pushers which are suitable for being moved in said conveying direction opposite to and synchronously with the trays of the second conveyor and for being moved transversely with respect to said first conveying direction so as to transfer the objects from the first conveyor onto the trays by translation, and - a second mechanical element which is designed to engage with the trays when they leave said contiguous conveying portion of the second conveyor in order to make said trays pivot in a tilted position.