A crusher for comminuting chips comprising - a hopper for filling the chips, - a fine breaking mechanism for breaking the chips into fine chips, and - a chip discharge, wherein - the hopper is arranged above the fine breaking mechanism in the vertical direction and the fine breaking mechanism is arranged above the chip discharge in the vertical direction, - the chips filled via the hopper may include coarse particles, - the fine breaking mechanism is provided with fixed external teeth and a rotary inner cutter head with blades, - the fixed teeth of the fine breaking mechanism are arranged on at least two segments movable in such a way that they can be moved away from the cutter head when a coarse particle enters the fine breaking mechanism so the coarse particle can pass through the fine breaking mechanism. - the segments of the fine breaking mechanism are arranged in an intermediate space between a base plate and a cover plate arranged in the vertical direction above the base plate, - the cutter head of the fine breaking mechanism is designed and arranged in an operating position of the segments with respect to the fixed teeth in such a way that chips fed via the hopper to the fine breaking mechanism when the cutter head is rotating are broken into fine chips through the interaction of the blades and the fixed teeth, - the chip discharge is designed and arranged so that the fine chips leave the crusher from the fine breaking mechanism via the chip discharge, whereby the segments of the fine breaking mechanism can assume a cleaning position in addition to the operating position, wherein, when the segments are in the cleaning position, an intermediate space is provided between the base plate and the cover plate allowing access in the horizontal direction to the cutter head, characterized in that the segments of the fine breaking mechanism are swivelably arranged around a vertical pivot axis. - a hopper for filling the chips, - a fine breaking mechanism for breaking the chips into fine chips, and - a chip discharge, wherein - the hopper is arranged above the fine breaking mechanism in the vertical direction and the fine breaking mechanism is arranged above the chip discharge in the vertical direction, - the chips filled via the hopper may include coarse particles, - the fine breaking mechanism is provided with fixed external teeth and a rotary inner cutter head with blades, - the fixed teeth of the fine breaking mechanism are arranged on at least two segments movable in such a way that they can be moved away from the cutter head when a coarse particle enters the fine breaking mechanism so the coarse particle can pass through the fine breaking mechanism. - the segments of the fine breaking mechanism are arranged in an intermediate space between a base plate and a cover plate arranged in the vertical direction above the base plate, - the cutter head of the fine breaking mechanism is designed and arranged in an operating position of the segments with respect to the fixed teeth in such a way that chips fed via the hopper to the fine breaking mechanism when the cutter head is rotating are broken into fine chips through the interaction of the blades and the fixed teeth, - the chip discharge is designed and arranged so that the fine chips leave the crusher from the fine breaking mechanism via the chip discharge, - the hopper is arranged above the fine breaking mechanism in the vertical direction and the fine breaking mechanism is arranged above the chip discharge in the vertical direction, - the chips filled via the hopper may include coarse particles, - the fine breaking mechanism is provided with fixed external teeth and a rotary inner cutter head with blades, - the fixed teeth of the fine breaking mechanism are arranged on at least two segments movable in such a way that they can be moved away from the cutter head when a coarse particle enters the fine breaking mechanism so the coarse particle can pass through the fine breaking mechanism. - the segments of the fine breaking mechanism are arranged in an intermediate space between a base plate and a cover plate arranged in the vertical direction above the base plate, - the cutter head of the fine breaking mechanism is designed and arranged in an operating position of the segments with respect to the fixed teeth in such a way that chips fed via the hopper to the fine breaking mechanism when the cutter head is rotating are broken into fine chips through the interaction of the blades and the fixed teeth, - the chip discharge is designed and arranged so that the fine chips leave the crusher from the fine breaking mechanism via the chip discharge, whereby the segments of the fine breaking mechanism can assume a cleaning position in addition to the operating position, wherein, when the segments are in the cleaning position, an intermediate space is provided between the base plate and the cover plate allowing access in the horizontal direction to the cutter head, characterized in that the segments of the fine breaking mechanism are swivelably arranged around a vertical pivot axis.