PURPOSE:To provide a screw feeder for constant cut out of pulverized/granular substance, wherein the amount of cutting out is made constant regardless of the size of cutting-out, by making the end of shaft without blades to form a dia. enlarging end, and by forming radially stretching grooves with constant section area till the end. CONSTITUTION:The end of a shaft 8 is made without screw blade 9 to form an end part 82 with enlarging outside dia. toward the end. This end part 82 is provided with a plurality of radially stretching grooves 83. The section area AD of a flow path 21 formed by this end part 82 shall be substantially equal in every place, which shall be the same as the section area As of different places of flow path 20. This constitution stabilizes the amount of cutting-out of pulverized/granular substance regardless of the size of cutting-out and prevents the substance from becoming too much pressurized in flow path, that should prevent increase of the load resistance in exhaustion. Thus uniform and constant amount cutting-out is secured.
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