A device for supplying a ground brewing substance for preparing beverages, the device being configured to be arranged within an automatic beverage vending machine to feed the ground brewing substance from a grinding unit of the vending machine towards a brewing unit of the vending machine, and comprising: - a chute configured to receive an amount of ground brewing substance from the grinding unit and to convey it to the brewing unit; - a vibration generator associated with the chute to apply vibrations thereto; characterized in that the device comprises: - at least one connection member for coupling the chute to a fixed frame of the automatic vending machine and comprising at least one damper element for damping vibrations transmitted to the frame; and - a bracket configured to be fixed to the frame by means of the connection member with the interposition of the damper element; wherein the chute is integrally fitted to the bracket to be coupled, through the bracket, to the frame and to be supported by the frame; wherein the vibration generator is fixed to the bracket for applying vibrations to the bracket; wherein the at least one damper element is configured to be operatively interposed, when the supply device is mounted to the frame, between the frame and the bracket; wherein the chute is integrally fitted to the bracket by means of at least one further connection member configured to transmit said vibrations from the bracket to the chute; wherein said further connection member comprises: - a threaded bushing fixed to one of the chute and the bracket and configured to engage a respective seat obtained in the other of the chute and the bracket; and - a threaded member configured to engage the bushing inserted into the seat for fixing the chute to the bracket in a releasable manner; wherein the bushing is configured to cross a through hole formed in a partition plate of said frame with a clearance such that the bushing does not interfere with the partition plate during operation of the vibration generator; and wherein the bracket and the chute are configured to be arranged on opposite sides of said partition plate. - a chute configured to receive an amount of ground brewing substance from the grinding unit and to convey it to the brewing unit; - a vibration generator associated with the chute to apply vibrations thereto; characterized in that the device comprises: - at least one connection member for coupling the chute to a fixed frame of the automatic vending machine and comprising at least one damper element for damping vibrations transmitted to the frame; and - a bracket configured to be fixed to the frame by means of the connection member with the interposition of the damper element; - at least one connection member for coupling the chute to a fixed frame of the automatic vending machine and comprising at least one damper element for damping vibrations transmitted to the frame; and - a bracket configured to be fixed to the frame by means of the connection member with the interposition of the damper element; wherein the chute is integrally fitted to the bracket to be coupled, through the bracket, to the frame and to be supported by the frame; wherein the vibration generator is fixed to the bracket for applying vibrations to the bracket; wherein the at least one damper element is configured to be operatively interposed, when the supply device is mounted to the frame, between the frame and the bracket; wherein the chute is integrally fitted to the bracket by means of at least one further connection member configured to transmit said vibrations from the bracket to the chute; wherein said further connection member comprises: - a threaded bushing fixed to one of the chute and the bracket and configured to engage a respective seat obtained in the other of the chute and the bracket; and - a threaded member configured to engage the bushing inserted into the seat for fixing the chute to the bracket in a releasable manner; - a threaded bushing fixed to one of the chute and the bracket and configured to engage a respective seat obtained in the other of the chute and the bracket; and - a threaded member configured to engage the bushing inserted into the seat for fixing the chute to the bracket in a releasable manner; wherein the bushing is configured to cross a through hole formed in a partition plate of said frame with a clearance such that the bushing does not interfere with the partition plate during operation of the vibration generator; and wherein the bracket and the chute are configured to be arranged on opposite sides of said partition plate.