A feeder device for feeding mailpieces to a postal sorting conveyor

A feeder device for feeding mailpieces to a postal sorting conveyor, said feeder device comprising:

• an unstacker head configured to put the mailpieces in series and on edge on the sorting conveyor,
• an unstacker plate extending upstream from the unstacker head and configured to unstack the mailpieces one-by-one towards the unstacker head, and
• a mailpiece feed conveyor configured to convey the mailpieces in a stack on edge and flatly against the unstacker plate,
• wherein the unstacker plate extends within the width of the feed conveyor only, between a first plate end and a second plate end opposite from the first plate end, said unstacker plate comprising a stationary portion that extends longitudinally on the feed conveyor from the unstacker head to form the first plate end, said stationary portion being configured to move the mailpieces one-by-one towards the unstacker head, said unstacker plate further comprising a moving portion that extends the stationary portion on the feed conveyor to form the second plate end, said moving portion being configured to be passive in moving the mailpieces towards the unstacker head, and in that said moving portion is mounted to pivot from the stationary portion between a first position in which the stationary portion and the moving portion are aligned with each other, and a second position in which the stationary portion and the moving portion are angularly offset relative to each other.