Shredder for breaking bulk material, comprising - a funnel-like vessel, of which the base is provided with - a discharge orifice, of which two mutually opposite edges are equipped with a plurality of teeth, which are in each case spaced from one another in the manner of a comb and are oriented parallel to one another, and - at least one knife shaft, which covers the discharge orifice, each knife shaft - being rotatably mounted in the vessel and - being set into rotation by means of at least one drive and - being spaced from the edges and, if appropriate, from one another and oriented in parallel and - being equipped with a plurality of cams, - which are spaced radially and from one another and are oriented parallel to one another, and - which partly engage in the interspaces of the cams of the adjacent knife shafts or in the interspaces of the adjacent teeth, characterised in that - knife shaft can, at least between its centre portion, which is equipped with cams, and its first end portion, which is mounted in the vessel, be separated by means of a first separating joint, wherein - the separating joint is oriented in deviation from the longitudinal axis of the knife shaft and - on the first of the two surfaces of the adjacent shaft portions (32, 33), which form the separating joint, at least one groove or notch is formed, into which a complementarily shaped tongue or rib can be pushed lengthwise, which is part of the second surface of the adjacent shaft portions (32, 33) which form the separating joint, and - the groove or notch and the tongue or rib, which is formed complementarily thereto, are designed so as to be continuous and - the centre portion can also be detached from the vessel in the region of its second end portion, which is mounted in the vessel. - a funnel-like vessel, of which the base is provided with - a discharge orifice, of which two mutually opposite edges are equipped with a plurality of teeth, which are in each case spaced from one another in the manner of a comb and are oriented parallel to one another, and - at least one knife shaft, which covers the discharge orifice, each knife shaft - being rotatably mounted in the vessel and - being set into rotation by means of at least one drive and - being spaced from the edges and, if appropriate, from one another and oriented in parallel and - being equipped with a plurality of cams, - which are spaced radially and from one another and are oriented parallel to one another, and - which partly engage in the interspaces of the cams of the adjacent knife shafts or in the interspaces of the adjacent teeth, - being rotatably mounted in the vessel and - being set into rotation by means of at least one drive and - being spaced from the edges and, if appropriate, from one another and oriented in parallel and - being equipped with a plurality of cams, - which are spaced radially and from one another and are oriented parallel to one another, and - which partly engage in the interspaces of the cams of the adjacent knife shafts or in the interspaces of the adjacent teeth, - which are spaced radially and from one another and are oriented parallel to one another, and - which partly engage in the interspaces of the cams of the adjacent knife shafts or in the interspaces of the adjacent teeth, - knife shaft can, at least between its centre portion, which is equipped with cams, and its first end portion, which is mounted in the vessel, be separated by means of a first separating joint, wherein - the separating joint is oriented in deviation from the longitudinal axis of the knife shaft and - on the first of the two surfaces of the adjacent shaft portions (32, 33), which form the separating joint, at least one groove or notch is formed, into which a complementarily shaped tongue or rib can be pushed lengthwise, which is part of the second surface of the adjacent shaft portions (32, 33) which form the separating joint, and - the groove or notch and the tongue or rib, which is formed complementarily thereto, are designed so as to be continuous and - the centre portion can also be detached from the vessel in the region of its second end portion, which is mounted in the vessel.