Abstract: A rotary drum trimmer device with one or more dynamic shear bands. The trimming device receives plant material through a hollow interior of a generally cylindrical drum having a plurality of perforations extending through its sidewall. The perforated drum rotates to tumble plant material within its interior thereby exposing portions of the plant material through perforations in the drum sidewall. Disposed against an outside surface of the rotating perforated drum are one or more shear bands. Rotary moment of the drum relative to the shear bans(s) severs plant material extending through both elements. The shear band is configured to move (e.g., reciprocally) relative to the perforated drum while the drum rotates to improve trimming.

Abstract: The present invention shows an apparatus for trimming plants, specifically assisting with the process of separating leaves and buds from the stem and branches of the plant. The apparatus is composed by an iris mechanism with blades that automatically close around a plant stem when the plant stem is inserted into the apparatus. In a further arrangement, the iris mechanism automatically opens once the plant stem has been processed.