A milling mechanism to grind cereals comprising: a moving roll; a standing roll; for each end of the rolls (13, 5), comprising: an assembly bracket; said moving roll being assembled by means of a moving bearing to the assembly bracket; the standing roll being mounted to a standing bearing (5.2) on the assembly bracket; a piston coupled to the assembly bracket by means of a moving hub (7.1); a spring assembly having a tension arm connected with one end to the moving bearing; an adjustment spindle; said milling mechanism comprising: • a moment arm rotatable on a moving hub (1.1), the moving hub (1.1) connecting the moment arm to the standing bearing (5.2) by means of a pin; • the moment arm moving by rotating the adjustment spindle which is assembled from the adjustment spindle coupling point (15.2) in a rotatable manner and which positions the moment arm with the adjustment spindle nut (15.3) accurately, to accurate adjust the said rolls (13, 5); • other end of the moment arm includes an eccentric bush, which is driven eccentrically in the eccentric bush slot by the piston while being connected to other end of the tension arm to allow said rolls (13, 5) to be quickly and in a stable manner engaged and disengaged by means of said piston characterized by • a roll assembly lifting wheel apparatus which is assembled externally when needed and allows said assembly bracket be lifted upwards to some extent; • a locking latch with a locking eccentric spindle ensuring the locking of said adjustment spindle, and a locking compressing piece connected to said latch and linearly displaced up and downward, • fixation teeth (30.1) formed on the adjustment spindle allowing said locking compressing piece to lock and engage, • a compressing spring compressing said locking piece, • a compressing spindle bushing wherein said compressing spring and locking piece are kept, and a cover (34.1) of said bushing. • a moment arm rotatable on a moving hub (1.1), the moving hub (1.1) connecting the moment arm to the standing bearing (5.2) by means of a pin; • the moment arm moving by rotating the adjustment spindle which is assembled from the adjustment spindle coupling point (15.2) in a rotatable manner and which positions the moment arm with the adjustment spindle nut (15.3) accurately, to accurate adjust the said rolls (13, 5); • other end of the moment arm includes an eccentric bush, which is driven eccentrically in the eccentric bush slot by the piston while being connected to other end of the tension arm to allow said rolls (13, 5) to be quickly and in a stable manner engaged and disengaged by means of said piston characterized by • a roll assembly lifting wheel apparatus which is assembled externally when needed and allows said assembly bracket be lifted upwards to some extent; • a locking latch with a locking eccentric spindle ensuring the locking of said adjustment spindle, and a locking compressing piece connected to said latch and linearly displaced up and downward, • fixation teeth (30.1) formed on the adjustment spindle allowing said locking compressing piece to lock and engage, • a compressing spring compressing said locking piece, • a compressing spindle bushing wherein said compressing spring and locking piece are kept, and a cover (34.1) of said bushing.