PURPOSE: To prevent the falling of a raw material on a feeding port, at the time of the abnormal falling of a raw material on the side opposite to the exhaust one of a vibration pelletizer, by providing means for detecting the above and stopping stage equipment in the upstream side.

CONSTITUTION: When a vibration pelletizer 1 is overloaded and a raw material can not be fed from stage equipment in the upstream side to stage equipment in the downstream side, an air spring on the side opposite to the exhaust one is compressed, and the vibration pelletizer 1 inclines on the side opposite to the exhaust one and falls while it is brought into contact with a pipe 1a for detecting abnormal falling. In accordance with it, a wire 4d is pulled in the upper direction, and a lever 4g falls on the side of a limit switch 4j via the supporting point of a bracket 4i. The limit switch works, and by its stop signal, the stage equipment on the upstream side is stopped to prevent the falling of the raw material from a feeding port to the outside. This apparatus does not mulfunction in a floor environment having high vibration.