FIELD: mechanical engineering. SUBSTANCE: gear has grinding wheel with mechanism for its rotation, longitudinal movement and lateral feed attached to housing of blade shaft. Rotation axis of grinding wheel is located in one plane with rotation axis of blade shaft at angle of 87-89.5 deg to the latter. Grinding wheel is manufactured in the form of "cylindrical cup". EFFECT: enhanced sharpening efficiency. 2 cl, 2 dwg, 1 tbl
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