Abstract: A nozzle mechanism for generating a twist in a yarn in an air-jet spinning machine, the nozzle comprising a central cylindrical duct having an axis through which a yarn is delivered in a selected direction and a bore having an axis and a diameter entering tangentially into the cylindrical duct for inputting compressed air into the duct, the bore entering the duct such that the axis of the bore forms an obtuse angle with the axis of the duct, the bore further entering the duct such that the perpendicular distance between the axis of the bore and the point of tangential entry of the bore into the duct is less than half the diameter of the bore.

Abstract: The method and apparatus for supplying a reserve feed stock to a spinning machine or spinning position thereof, contemplates monitoring the operational state of a production feed stock and upon reaching a predeterminate operational state thereof, such as near depletion or depletion of the production feed stock, or even rupture thereof, bringing a reserve feed stock previously held in readiness into a production position where such reserve feed stock now assumes the role of a production feed stock. Consequently, downtime of the spinning machine or spinning position can be minimized and its operation at least partially automated since there is always available a reserve feed stock to allow for essentially continuous or continual production of a spun yarn or thread. One specific piecing technique uses a movable member for placement of a reserve feed stock into the travel path of a production feed stock such that piecing of these two feed stocks is reliably attained.