The upper part of the machine consists of a feed hopper receiving the containers from an integrated elevator which measures out their quantity using photoelectric sensors. The hopper bottom is composed of a cone whereon the containers glide towards peripheral selectors which are mounted on a rotating carousel supported and driven by the main gearmotor unit. An inverter is employed for the unscrambler motorization, thus enabling an accurate speed regulation whilst ensuring soft starts and stops, for the benefit of transmission components lifetime and as a guarantee of a higher reliability. Once containers are inside selectors they fall upright into vertical channels which set them gently down onto an outfeed slat band conveyor made of acetalic resin; this is also driven by an inverter drive that, enabling an accurate synchronization of outfeed speeds, prevents problems during extraction phase. This operation can be further improved using a “vacuum” slat conveyor that enhances containers stability. In order to feed the line smoothly and continuously, the unscrambler can run at a basic speed (corresponding to the nominal output) and at a “slowdown” speed, that can be set by the operator panel: the change from one speed to the other takes place automatically and it is controlled by photocells checking the accumulation state on downstream conveyors.