Modified Raspbar Type Rotors

Axial Flow Rotors

This is a short explanation concerning
advantages of using rasp type rotor bars, as
opposed to conventional rub bar type rotor bars.

The nearly vertical profile of the leading edges
of rasp type rotor bar teeth pulls more easily, and
provides more positive rolling and fluffing action
of material for separation of the crop, without the
requirement for the squeezing and tearing action
of rub bar type rotor bars.

The depth and spacing of rasp type rotor bar
teeth provides open area for grain and fines to
channel between them, as opposed to the
pinching action at the concave surface required
by the use of shallower toothed rub bar style
rotor bars, and also deposits grain and fines more
evenly through the entire concave and separating
grate areas, providing a more consistent
spreading of the load across the cleaning shoe.

The constant arch at the top of the rasp bar
type teeth provide for a wider area of coverage in
respect to concave overbore, and in combination
with tooth spacing provide more angular
deflection against the concave crossbars than
rub style rotor bars, moving material toward the
rotor discharge area more easily, and preventing
roping in vine crops.

The longer length of individual rotor bars, in
combination with mountings, which are spiraled
around the rotor in a staggered configuration,
sweeps and spreads material across the concave
crossbars more evenly, and provide for a more
consistent threshing progression and load on the
rotor.