an injection assembly for an injection molding machine , with a continuously operating plasticizing unit , includes a piston - type injection unit and an arrangement for intermediate storage and discharge of melt . several melt reservoirs with melt inlet openings are provided between the plasticizing unit and the piston - type injection unit . melt lines that connect the melt reservoirs with each other and with the plasticizing unit extend to the melt inlet openings . the melt reservoirs include actuatable work pistons for discharging the melt , wherein the work pistons can open and close the melt inlet openings in the melt reservoirs to divert the melt flow . the disclosed injection unit increases the total volume of bufferable melt and allows individual and separate adjustment of the reservoir volumes and the discharge velocity of the individual melt reservoirs . in addition , switching valves can be eliminated since the melt flow is switched by the work pistons .