Abstract: Apparatus for monitoring yarns on spinning machines includes a sensor which is disposed such that it can travel along a track in front of the production stations. In order to permit each spinning station of a spinning machine to be monitored to an extent such that mavericks and other forms of unevenness in the yarn can be located, the sensor (2) is formed and disposed to detect the diameter of the yarn.

Abstract: The invention relates to a method and apparatus for detecting periodic defects in a test material moved longitudinally. In order to enable periodic defects in elongate test material moved longitudinally to be continuously detected with little expenditure, at least two measurements of a parameter which follow one another at a comparatively short interval (W/2) are to be carried out at time intervals (T1, T2 , T3).

Abstract: The yarn (3) is illuminated by a transmitter (1) and the light reflected by the yarn surface is fed to a detector (5) and evaluated, the optical path being selected such that the receiver (5) receives light only from that side of the yarn (3) that is not illuminated.

Abstract: Successive groups of thread paths in multi-spindle textile apparatus are equipped with individual monitoring systems. In each system, a joint monitoring element (S,E,L) is provided which has a bundle of rays (L). The latter is moved transversely to the thread running direction, passes thereby over the production points (1-8) arranged in rows and is interrupted or attenuated at each production point by the respective thread. The shading of the bundle of rays caused thereby is assessed as criterion for the presence of the thread concerned.The process makes possible an on-line production and quality monitoring on multi-spindle textile machines, for example ring spinning frames, with a reasonable expenditure.

Abstract: A common monitoring system with a light beam is provided for a group of two or more production units arranged in a row. The beam passes through the thread balloon formed by the moving thread of each of these production units and is intermittently interrupted or attenuated by the moving thread in each balloon. The resulting shading is converted into an electric signal in a receiver of the monitoring system.The threads of the individual production units can be identified by evaluating the relationships of amplitude, time and phase between the individual shading impulses.The process enables on-line production and quality control to be carried out on multi-spindle textile machines such as ring spinning machines at an acceptable cost.

Abstract: To measure the tension in a set of threads (10) or a warp (11) in a loom or the like, a vibrating device (20) which is rotatable about an axis (23) is moved into the vicinity of the web of material so that the material is thereby slightly deflected from its straight line course. The vibrating device (20) is set into oscillating movement by an excitation device (30). The frequency (f.sub.o) at which the vibration of the device (20) becomes established is directly dependent upon the tension P in the group of threads or the fabric, and this tension can therefore be determined from the frequency f.sub.o. The vibrating device (20) may also be set into its intrinsic vibration at an intrinsic frequency f.sub.o simply by the threads (10) or fabric (11) gliding over its surface (24), and this frequency can be measured by means of a sensor (34) and transducer (35). A particularly advantageous construction of the vibrating device (20) consists of a plate with a notch (26) lying on a knife edge (27).

Abstract: For determining the cross-section of running yarns, rovings and slivers in the textile industry, or of cables and filaments a test object is passed through an enclosed sonic chamber in which standing waves of at least two frequencies are generated by sonic emitters and their state is sensed by sonic receivers. The cross-section of the test object is determined by changes caused by the test object to the standing wave with respect to amplitudes, phases and/or pulses compared with undisturbed wave propagation. The particular arrangement of sonic emitters and sonic receivers causes especially appropriate modes of standing waves to be generated which act with optimum influence on the test object. As the device is used directly on production machines, which experience unavoidable vibrations during operation, measures are provided for at least partial compensation of unwanted signals caused by vibrations in the sonic receivers by their appropriate location and reciprocal electrical connection.

Abstract: A rapidly reacting measuring element is used at the delivery of the drafting zone on autolevelling drawframes used in the textile industry, which makes it possible to superimpose on the signal thus obtained from the measuring element by means of an electronic system a further measurement signal at the delivery of the drawing passage and thus correct the parameters governing the drafting values in such a way that even short-term variations in cross-section of the textile material are levelled out. The critical factors here are especially the delay time T of the textile material between the correcting element (pair of drafting rollers with variable speed of rotation) and the measuring element and also the overall amplification V of the measurement signal.

Abstract: A method and apparatus for measuring the tension on textile fabrics in a textile machine especially a loom. At least a part of a fabric is subjected to simultaneous transverse deflections, the speed of propagation of the simultaneous transverse deflections along the fabric is determined, and the tension on the fabric is determined in accordance with the determined speed of propagation. An exciter and a receiver is utilized for initiating the transverse deflections and determining the speed of propagation thereof.

Abstract: A method of and apparatus for binding fiber bundles, as produced in the textile industry. Each of the two fiber bundles is mixed with the other fiber bundle in two regions of the binding and is wound around in a force-locking manner with individual fibers originating from the fiber bundles. The loose ends of the two bundles to be bound are automatically severed during the course of the formation of the binding and the remaining ends are introduced or worked into the binding using a pair of rotatable disc-shaped deformation members which are selectively movable toward one another while rotating to engage the fiber bundles.

Abstract: The invention relates to a method and an apparatus for obtaining pedeterminable and exact yarn lengths on cross-wound bobbins. It is thereby assumed that all complete cops substantially have the same yarn length and of these only individual partial or remnant cops may contain less yarn. By determining the operation periods or the number of revolutions of the grooved cylinder or the cross-wound bobbin in relation to the yarn length of complete cops, counting values are introduced into a control unit which are totalled in this unit and compared with a set value which corresponds to the yarn length of the complete cross-wound bobbin. As soon as the set value has been obtained, the winding method is interrupted. Further developments of this method enable operating periods or the number of revolutions of different winding points to be compared and thereby to recognize defecting winding methods.

Abstract: In monitoring a continuous sequence of work positions on a textile machine for thread breakage, a magnetic probe is driven along a path adjacent the ring traveler at each work position so as to generate a signal upon detection of the traveler as it rotates with the thread and provide no signal when the traveler ceases to rotate due to thread breakage. To simplify the electrical connection to the probe, the drive arrangement for the probe includes at least one conductive metallic drive band connected to the probe and to a driving source for moving the probe along the path past the work positions. A detector is then coupled to the drive band to detect the electrical signals carried thereby from the probe.

Abstract: In a method and apparatus for the two-way transmission of pulses between a plurality of out-stations generally connected to a common power supply network and at least one control unit, the data is applied to the power supply network using pulse code modulation so that the power supply network serves as a data bus bar between the out-stations and the control unit. A multiplexing of the data applied to the network permits individual communication between an out-station and the control unit during an assigned time slot with the power supply frequency being used for synchronizing the timing of the multiplex system.

Abstract: A plurality of combing machine slivers having periodically variable densities are combined in such a way that the density variations approximately compensate one another and a complete sliver having little density variation is formed. The relative phase positions of the respective combing machine slivers when assembled together are controlled in response to the periodicity of the complete sliver.

Abstract: This invention relates to the art of quality control, more particularly to the regulation of electronically operated quality control equipment such as yarn cleaners, or the like so that the quality control equipment may be selectively adjusted to eliminate faults of a given magnitude only when they occur over an undesired period.

Abstract: A method for regulating the operation of yarn clearers having error correcting means such as yarn cutters, and sensing means providing an electrical signal representative of the controlled quality. The method comprises the steps of: feeding the signal from the sensing means to two independent electrical circuit channels each having separate threshold switch means, the threshold switch means of one circuit responsive to signals corresponding to yarn faults of given magnitude. The threshold switch means of the other circuit responds to signals corresponding to faults of given duration. Thereafter, an independent control signal is obtained from each of said channels for initiating the operation of the cutters when a limiting value selected for each of said two channels is exceeded.

Abstract: In order to compensate the combing periods in density fluctuation machine slivers, the density of each of a plurality of slivers is measured to detect the phase positions of the combing periods therein and then the relative positions of the respective slivers are adjusted to place the combing periods in each sliver out of phase with the combing periods in the other slivers before the slivers are combined. The adjustment of the phase position of the slivers is effected by varying the length of the path of the sliver between the combing machine and the point where the slivers are combined.