Patent ID: 7293725

Claim:
A gap adjuster of an impact crusher, the impact crusher having: a rotor having an impact portion; a rotor drive for rotating the rotor; and a rebound plate spaced apart from a rotation locus of a tip end of the impact portion by a gap, the gap adjuster comprising: a rebound plate support for movably supporting the rebound plate; a rebound plate drive for driving the rebound plate support to move the rebound plate; a movement sensor for detecting the movement amount of the rebound plate; a rise sensor for detecting a rise of the rebound plate support when the rebound plate makes contact with the rotor that is stopped and when the rebound plate away from a contact position with the rotor that is stopped touches the rotor during rotation; a set value inputting device for setting and inputting a desired gap amount between the rebound plate and the impact portion; and a controller for controlling the rebound plate drive and the rotor drive based on detection signals from the movement sensor and the rise sensor, and a desired gap amount inputted by the set value inputting device, wherein the rebound plate support is moved away from the rotor by the desired gap amount when the rise of the rebound plate support away from the contact position with the rotor that is stopped is not detected.