a coin accumulator assembly for use in a coin wrapping machine is provided . the coin accumulator assembly comprises a coin accumulator tube , a shutter movably inserted into the coin accumulator tube for supporting coins stacked in the tube until a predetermined number of coins is accumulated and for opening to pass coins for a further treatment when the predetermined number of coins is accumulated in the tube , and a system for stepwisely lowering the shutter during the coin counting and accumulating operation . the system for effecting stepwise lowering of the shutter includes a support member for supporting the shutter and having a threaded hole , a screw shaft thrusting through said threaded hole of the support member , a reversible motor for rotating the screw shaft , and a guide rod to be slidably engaged with the support member for preventing the support member from being rotated but for guiding the same in the downward or upward direction when the screw shaft is rotated . a modified system including a rack - and - pinion unit may be used in place of the aforementioned system . a further modified system including a swingable arm for lowering or raising the support member is also disclosed herein . further disclosed are the control systems for controlling the coin accumulator assembly in accordance with the pre - set control sequence .