Apparatus for milling cereals

Apparatus for producing, by processing cereals, such as grain, a siftable product, especially a product suited for flour production by subsequent sifting, said apparatus comprising at least one pair of cooperating processing members having serrated disintegrating zones for treating said cereals therebetween and, in the case of flour production, devices for sifting the product produced by said cooperating members, said members, at least one of which is rotatable, having a common axis of rotation, and the serrated zone of each of said cooperating members being circular and composed of a series of segments forming cutting teeth alternating with parallel grooves, each of which has a serrate pattern composed of a plurality of ridges forming cutting teeth alternating with parallel grooves, each of said cooperating processing members, at least on one side thereof, has an annular serrated zone having inner and outer perpheries and composed of segments each having a serrate pattern of cutting teeth and grooves extending in parallel throughout the width of said segment from the inner periphery to the outer periphery of said annular serrated zone, said teeth having a constant and mutually equal height and mutually equal width, and said grooves between the cutting teeth having a substantially constant and mutually equal width and mutually equal depth, each cutting tooth being in the form of an elongated ridge having a crest surface (15) and, on either side thereof, two opposite longitudinal flank surfaces which make different angles in relation to a plane along the cutting tooth perpendicular to the base thereof, and in that said cutting teeth are so designed that during relative rotation of said processing members when in operation, one of the cutting teeth of each segment of each of said cooperating zones of each of said processing members intersects a line of symmetry for each of said segments of the other of said cooperating zones at an angle .+-..alpha..sub.1 for the serrated zone of one processing member and .+-..alpha..sub.2 for the serrated zone of the other processing member, said angle .alpha. being positive on one side and negative on the opposite side of said line of symmetry, and further in that at least the first cutting tooth at one end of each segment of one of said processing members during movement past the opposite teeth of each segment of the other processing member will intersect the last-mentioned cutting teeth at angles of intersection K which vary according to the relationship K=(.alpha..sub.1 +.alpha..sub.2).+-.X.degree. where K is the angles of intersection of the opposite cutting teeth in relation to each other, .alpha..sub.1 and .alpha..sub.2 represent said angle, positive or negative, which a cutting tooth of each segment of one or the other of the processing members makes in relation to the line of symmetry of said segment, and x is the sectoral arc angle of the segment.