Unit for conveying articles between a first zone and a second zone, the conveying unit comprising: - a frame bearing a first cam path and a second cam path mounted one on top of the other, - a support mounted to rotate on the frame about a main axis of rotation, - at least one device for transferring articles, mounted on the support, each transfer device comprising: - an arm of extendible type, having a proximal part fixed onto the support and a distal part that is movable with respect to the proximal part, in a plane transversal to the main axis of rotation; - a clamp mounted on the distal part of the arm; - a guiding roller cooperating with the first cam path to bring the clamp away from or closer to the support, and - an orientation roller of the clamp, cooperating with the second cam path to orient the clamp in the transverse plane, said clamp having a rider bearing the guiding roller and the orientation roller, the rider being mounted to rotate on the arm about a secondary axis of rotation parallel to the main axis of rotation, to allow the rotation of the clamp on the arm, and the guiding roller and the orientation roller being positioned on either side of the arm, the rider pivoting on the arm from: - a configuration of extension of the arm, in which the orientation roller or the guiding roller is radially more off-centre from the main axis of rotation, and respectively pushes back the guiding roller or the orientation roller bearing against the first cam path or the second cam path respectively, by the pivoting of the rider about the secondary axis of rotation, to - a configuration of shortening of the arm, in which the guiding roller or the orientation roller is radially more off-centre from the main axis of rotation, and respectively pushes back the orientation roller or the guiding roller bearing against the second cam path or the first cam path respectively by the pivoting of the rider about the secondary axis of rotation. - a frame bearing a first cam path and a second cam path mounted one on top of the other, - a support mounted to rotate on the frame about a main axis of rotation, - at least one device for transferring articles, mounted on the support, each transfer device comprising: - an arm of extendible type, having a proximal part fixed onto the support and a distal part that is movable with respect to the proximal part, in a plane transversal to the main axis of rotation; - a clamp mounted on the distal part of the arm; - a guiding roller cooperating with the first cam path to bring the clamp away from or closer to the support, and - an orientation roller of the clamp, cooperating with the second cam path to orient the clamp in the transverse plane, - an arm of extendible type, having a proximal part fixed onto the support and a distal part that is movable with respect to the proximal part, in a plane transversal to the main axis of rotation; - a clamp mounted on the distal part of the arm; - a guiding roller cooperating with the first cam path to bring the clamp away from or closer to the support, and - an orientation roller of the clamp, cooperating with the second cam path to orient the clamp in the transverse plane, said clamp having a rider bearing the guiding roller and the orientation roller, the rider being mounted to rotate on the arm about a secondary axis of rotation parallel to the main axis of rotation, to allow the rotation of the clamp on the arm, and the guiding roller and the orientation roller being positioned on either side of the arm, the rider pivoting on the arm from: - a configuration of extension of the arm, in which the orientation roller or the guiding roller is radially more off-centre from the main axis of rotation, and respectively pushes back the guiding roller or the orientation roller bearing against the first cam path or the second cam path respectively, by the pivoting of the rider about the secondary axis of rotation, to - a configuration of shortening of the arm, in which the guiding roller or the orientation roller is radially more off-centre from the main axis of rotation, and respectively pushes back the orientation roller or the guiding roller bearing against the second cam path or the first cam path respectively by the pivoting of the rider about the secondary axis of rotation. - a configuration of extension of the arm, in which the orientation roller or the guiding roller is radially more off-centre from the main axis of rotation, and respectively pushes back the guiding roller or the orientation roller bearing against the first cam path or the second cam path respectively, by the pivoting of the rider about the secondary axis of rotation, to - a configuration of shortening of the arm, in which the guiding roller or the orientation roller is radially more off-centre from the main axis of rotation, and respectively pushes back the orientation roller or the guiding roller bearing against the second cam path or the first cam path respectively by the pivoting of the rider about the secondary axis of rotation.