Abstract: A yarn splicer having a closable pneumatic chamber which is permanently open at each end so as to receive the yarns to be spliced from opposite ends, discrete yarn rolling means arranged on either side of the splicer adjacent each end of the chamber to engage the running portion of a respective yarn in the chamber, and yarn gripping means also disposed at either end of the chamber to engage the respective loose ends of the yarns. Actuation of the splicer results in a prescribed rolling action on the yarns in a direction to completely detwist them, and deactivation results in an equal and opposite action on the yarns so as to restore the original twist.The preferred arrangement has a biased lost motion linkage between the actuation means and the chamber-mechanism which provides a drive to the rolling means and gives an over-twist to the yarns during detwisting and which recovers the over-twist as well as restoring the original twist at the termination of the splice.

Abstract: A slot forming a splicing chamber is closed by sliding action between contacting surfaces of two bodies linked at a point which is perpendicularly spaced from both surfaces. The closure surface comprises the crown of a piston. The piston has a central orifice and is slidable in a bore in one of the bodies to which pressurized air is admitted. When the chamber is closed the orifice registers with the slot and allows a blast of air to pass from the bore into the slot.

Abstract: A frame construction for an open-end spinning machine includes an elongate plate extending along one side of the machine for supporting a first series of spinning unit housings and an elongate plate extending along the other side of the machine for supporting a second series of spinning unit housings. The plates are interconnected by transverse cross-members, which, preferably, do not project beyond the upper and lower extremities of the plates. Apertures equally spaced along the plates serve to receive and support the spinning unit housings.The plates are provided along their upper extremities with inwardly projecting flanges which abut against the cross-members so as to locate the plates.Preferably, the driving elements for the spinning elements supported by the spinning unit housings, and the suction ducts serving to provide vacuum at each of the spinning units are located between and within the upper and lower extremities of the plates.

Abstract: A machine for the open-end spinning of yarns includes a machine frame which supports a plurality of side-by-side spinning units, each including a fibre opening roller and a spinning rotor, the arrangement being such that the rotational axes of the spinning rotors and opening rollers lie in respective first and second planes. The housings are mounted on the machine frame for pivotal movement about an axis transverse to the rotational axis of the spinning rotor and positioned between the first and second planes.A catch for holding against pivotal movement additionally acts to hold a cover extending over the housing in place. A second cover, which may be transparent, lies beneath the first cover and separately covers the opening roller. The supporting brackets for the housings are arranged such that each housing can be readily removed from the machine frame.