Preform-supply device comprising a device for the selective removal of incorrectly-positioned longitudinal preforms

A system (20) of feeding preforms, particularly designed to feed a machine for blow moulding receptacles comprising, from upstream to downstream in the longitudinal direction of travel of the preforms (10), at least one sorting and alignment device (28) whose top end is fed with jumbled preforms (10) and whose bottom end comprises at least two alignment rollers (38), substantially parallel and rotated about their respective axis (A1, A2), that are designed to position the preforms (10) in conveyor rails (30), inclined relative to the horizontal, to convey them to the machine (22), and comprising, upstream of the machine (22), filtering means (48) to discard the incorrectly positioned preforms, whererin the filtering means (48) comprise, downstream of the alignment rollers (38), at least one selective discarding device (50) arranged to discard the preforms (10) called lying singly preforms, that is to say those that arrive from the rollers on the rails lying down and oriented longitudinally and that extend generally longitudinally on the conveyor rails (30),

• wherein the selective discarding device (50) comprises movable discarding means (52) that are controlled in movement by a driven actuator (54),
• wherein the movable discarding means (52) consist of at least one section (60) of movable rail that is capable, when a lying preform is detected, of being moved by the actuator (54) between a position of conveying the preforms and a retracted discarding position in which the preforms are discarded to recovery and/or recirculation means (70).