Abstract: An instrument is provided with several sensing elements to enable several parameters of a processed yarn to be measured or determined. In order to minimize the total sensing element/guide contact with the yarn within the complete process threadline, the yarn is guided through the instrument by contact only with the inlet and outlet guiding elements of the instrument and contact operative sensing elements. One particular instrument consists, in succession, of an interlace sensing device, a tension sensing device and an oil content sensing device. The electrical resistance of the yarn is measured between two pins of the oil content sensing device and in this case, the first pin is also a tension sensing pin of the instrument, and the second pin of the oil content sensing device is also the outlet guide of the instrument.

Abstract: Interlaced or twisted yarn is passed between an optical transmitter and receiver to produce an original signal which varies in response to the changes in dimension of the yarn. Such original signal is compared using cross-correlation with an expected signal as produced by an ideally processed yarn to produce a processed signal indicating by its value the degree of matching of the original signal with the expected signal. The amplitude of the processed signal is noted relative to a predetermined threshold value representing an acceptably processed yarn. The expected signal is devised by performing a frequency analysis on the original signal to establish a peak frequency which is used to determine the distance between nodes in an ideally processed yarn.

Abstract: A yarn treatment jet is provided having a venturi member with a venturi shaped bore, and an inlet member with a yarn passage therethrough located in the mouth of the bore, in which the inlet member is in contact with the mouth of the bore to locate the inlet member positively relative to the venturi member and is configured to provide a passage for air into the venturi bore between the inlet member and the venturi member. The inlet member may be formed of a core and a needle so that to change the configuration of the air passage only the core need be changed. The air passage is formed by one or more grooves or bores in the inlet member or core.

Abstract: A method of monitoring on-line the initial modulus of a spun and at least partially drawn textile yarn is provided. The method consists of forwarding the yarn from a forwarding point to a package, winding the yarn on the package whilst traversing the yarn adjacent the package at a periodically disturbed speed, and continuously measuring the short term variation in yarn tension due to the change in yarn path length between the forwarding point and the package. An alarm is initiated if the sampled data is equals predetermined limits. The initial modulus of the yarn is calculated from the amplitude of the tension variations.

Abstract: A relatively compact air jet is provided having a base and an operating part which is mounted on the base to rotate relative thereto to expose a yarn channel for threading. A straight air inlet through the base communicates with the yarn channel and has a valve member disposed within it. A connecting pin moved by a cam surface in the operating part acts on the valve member to open the air inlet when the operating part is in the operating position, but allows the air pressure on the valve member to close air inlet when the operating part is rotated to the threading position.

Abstract: An instrument is provided with several sensing elements to enable several parameters of a processed yarn to be measured or determined. In order to minimize the total sensing element/guide contact with the yarn within the complete process threadline, the yarn is guided through the instrument by contact only with the inlet and outlet guiding elements of the instrument and contact operative sensing elements. One particular instrument consists, in succession, of an interlace sensing device, a tension sensing device and an oil content sensing device. The electrical resistance of the yarn is measured between two pins of the oil content sensing device and in this case, the first pin is also a tension sensing pin of the instrument, and the second pin of the oil content sensing device is also the outlet guide of the instrument.

Abstract: An instrument is provided with several sensing elements to enable several parameters of a processed yarn to be measured or determined. In order to minimize the total sensing element/guide contact with the yarn within the complete process threadline, the yarn is guided through the instrument by contact only with the inlet and outlet guiding elements of the instrument and contact operative sensing elements. One particular instrument consists, in succession, of an interlace sensing device, a tension sensing device and an oil content sensing device. The electrical resistance of the yarn is measured between two pins of the oil content sensing device and in this case, the first pin is also a tension sensing pin of the instrument, and the second pin of the oil content sensing device is also the outlet guide of the instrument.

Abstract: A yarn treatment jet has a yarn passage extending through the body of the jet and a fluid inlet intersecting the yarn passage transversely. In cross-section the yarn passage has a main part and a substantially parallel sided yarn controlling part which is of lesser width than the main part. The width of the fluid inlet is greater than that of the controlling part but less than that of the main part. The yarn is guided to run in the yarn controlling part which the fluid inlet intersects and the fluid is directed past the running yarn in the direction of the main part. The yarn guides are movable towards and away from the inlet and outlet ends of the yarn passage. A curved threading slot connects the controlling part with the outside of the jet.