Abstract: An apparatus for comminuting and stoking of straw bales, and for automatic stoking of chips, pieces of wood, paper, industrial waste, garbage, lignite, coal, briquettes, pellets, and similar solid fuel includes a number of substantially parallel reciprocating or eccentrically moved serrated rods situated in connection with a feeding opening of a furnace. The serrated rods are operatively positioned for comminuting fuel and for tearing any retaining material utilized to contain the fuel. A feeder is provided for feeding fuel onto the serrated rods. A grate is situated between the serrated rods and a conveyor supplies fuel into the furnace.