Reciprocating feeders, CAP series, are feeding machines typically installed in primary units. They are particularly suitable in the presence of rather large sized dirty material. They mainly consist of a feeding tray (equipped with steps on the bigger models) resting on sliding wheels fixed onto the machine frame. A connecting rod and bearing system generates the movement. Transmission is by means of reduction gear units and electric motors. To adjust the capacity, which is necessary when handling uneven materials, it is recommended to couple a frequency converter to the electric command and control board.