Abstract: Disclosed is a plate-like yarn stripper device for use in removing staple fiber yarns from rotatable elements of circular cross-section, such as in the removal of yarn wraps underwound beneath a spindle blade to anchor the yarn threadline in the doffing and donning of cops on a ring spinning frame. The stripper is formed with a central hole defining stripping edges at a surface of the plate, these edges being spaced from the yarn-wound element by a prescribed distance such that when the element is rotated the wound yarn will buffet the edges and be abraded, weakened and cut or otherwise severed in the stripping action. Personnel safety is enhanced in use of the stripper by the absence of peripheral sharp edges, bristles or other abrasive external surfaces.

Abstract: All control components of the builder mechanism and its pick motion device are concentrically arranged about the builder shaft of a textile machine in such manner that the builder mechanism can readily be removed from the builder shaft as an entity for replacement, inspection, repair or substitution of parts, creating a compact construction of great durability and easy maintenance. Such concentrically disposed components include electromechanical control means for at prescribed times effecting directional reversals and stepped advancements of the points of movement reversals of the builder shaft with a differential gearing assembly which produces incremental angular advancements of switch components about the axis shaft when driven by pick-gear wheel and pick-gear pawl members thereof.