An installation for sorting articles comprises a carousel sorting conveyor having transport bins, an article feed magazine in which articles stored loosely are put into series and then injected one-by-one into the transport bins of the conveyor by an injection device, and a monitoring and control unit that acts on the bins so as to open each of them over a receptacle that corresponds to a delivery address of the article, the injection device comprising piston pushers and a system of sensors being provided to generate data representative of an outline of the article seen in plan so as to enable the data processing unit to detect inappropriate positioning of the article before it is injected into a bin, and, in such a situation, direct the improperly positioned article towards a reject receptacle.