Like the standard type, this machine is a beater featuring high reproducibility. The rolls are moved upward and downward by simple operation of a push button switch. Beating pressure is applied and released, being interlocked with motor rotation. The beating time is set in advance by number of rotations of the rolls. When the set rotation number is reached, the machine automatically stops. Operation process is automated, thereby alleviating the workload of operator and offering high work efficiency.