PURPOSE: To prevent accidents such as breakout by decreasing strokes when the resistance value generated in a mold exceeds a prescribed value and making stroke motion again when the resistance decreases.
CONSTITUTION: A buffer mechanism 20 is provided between a mold vibrating table 1 and a driving source constituted of an electric motor 13 and a speed changer 12, and when abnormally large resistance is generated in the mold, vibration strokes change. The movements of an output shaft 15 are transmitted to the table 1 by the spring retainers 2, 4 at both ends of connecting bare 5, 5' receiving the repulsive forces of springs 6,7. Hence, if the vibration resistance of the mold is lower than the prescribed set pressure of the springs 6 and 7, there are no elongation and contraction of the mechanism 20, and a constant stroke is maintained. When the resistance higher than the set value is generated, the springs 6 and 7 are compressed and the stroke beings to decrease, and when it exceeds a certain value, the stroke is made zero, and the vibration stops despite running of the motor 13. When the resistance decreases, the vibration is started again.
HIRATA KATSUMI
SASAKI KUNIMASA
