(57) A roller mill for crushing and/or flattening feed raw material has a frame, at least
one roller pair, which comprises a first roller (12) and a second roller (14), which
first and second roller are parallel, so that there is a gap (16) between them, adjustment
means for changing the distance between the first roller and second roller, a power
transmission mechanism for transmitting the rotational movement of the first roller
to the second roller with a desired transmission ratio, a transmission axle in the
end of the first roller for connecting to a power engine, an feeding device (40) for
feeding feed raw material into the gap between the first roller and the second roller,
and a control unit (22) for controlling the operation of said adjustment means and
feeding device. The roller mill additionally comprises a tachometer for measuring
the rotating speed of the transmission axle, which tachometer is connected to the
control unit, and the control unit is arranged to control the operation of the adjustment
means and/or feeding device based on the measured rotating speed.
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