Abstract: A system and method for adjusting a gap between rotary striking blades or hammers and an operating plate in a crusher without interrupting the operation thereof are disclosed. In one embodiment, the system includes a sensing bar provided on a slider, a shifting device for the slider, a moving device for the operating plate and a controlling device electrically connected to motors of the slider and the moving device. In operation, the sensing bar is brought into contact with the rotating striking blades or hammers by shifting the slider, whereby detecting the extent of wear of the striking blades or hammers from the total shifting distance of the slider, and the operating plate is then moved to the extent commensurate with the detected wear.