Patents Assigned to Luwa AG
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Patent number: 6683687Abstract: The assessment of the effects of yarn faults is carried out by simulating the fabric image. In a first step, the yarn is examined by a measuring member for parameters associated with the volume and/or the surface. In a second step, these parameters are converted into grey values or color values, and these values are assigned to image spots. Finally, the image spots are reproduced on a video display unit and/or a printer. An image is generated thereby, representing a simulation of a woven or knitted fabric produced from the examined yarn.Type: GrantFiled: September 30, 1996Date of Patent: January 27, 2004Assignee: Zellweger Luwa AGInventor: Robert Hoeller
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Patent number: 6601521Abstract: A traveling cleaner (12) for a textile manufacturing plant, the carriage of which has a carrying structure (18) supported on three running wheels (1, 2, 3). The running wheels (1, 2, 3) are suspended on wheel suspension units (20) and are arranged in a triangle in relation to one another, in such a way that the first running wheel (1) runs on a first rail (14) and the second running wheel (2) and the third running wheel (3) run one behind the other on a second rail (16). The rails (14, 16) form a runway (10) for the traveling cleaner (12) and are arranged next to one another above textile machines of the textile manufacturing plant.Type: GrantFiled: November 28, 2001Date of Patent: August 5, 2003Assignee: Zellweger Luwa AGInventors: Arnold Keller, Werner Zemp, Christian Dürig
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Patent number: 6553826Abstract: The invention relates to a process and a device for monitoring the quality of a strip (37, 44, 50) made of textile fibres which is moved in its longitudinal direction. In order to create a device and a process which allow flaws in a strip to be dealt with in a targeted manner and which facilitate the production of a strip which is as free as possible of variations in the cross-section or mass, variations in the mass of the strip are to be continuously detected and converted into an electrical signal. This signal should also be compared with a plurality of predetermined limiting values, limiting values for variations transverse to the longitudinal direction being provided and limiting values for variations in the longitudinal direction of the strip being provided.Type: GrantFiled: September 19, 2001Date of Patent: April 29, 2003Assignee: Zellweger Luwa AGInventor: Isidor Harzenmoser
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Patent number: 6510734Abstract: The invention relates to a method for assessing the effect of yarn defects on textile fabrics, which are to be produced from a given yarn, by simulating an image of the fabric. So that assessment of simulated textile fabrics may be carried out with greater reliability and more easily, a first image (51) of the fabric is generated by simulation based on parameters or measured signals of the given yarn. A second image (52) of the fabric is generated by simulation based on parameters of a reference yarn and finally the first image is compared with the second image.Type: GrantFiled: December 3, 1998Date of Patent: January 28, 2003Assignee: Zellweger Luwa AGInventor: Peter Feller
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Patent number: 6499345Abstract: The invention relates to a measuring device for thread-like test samples (3), comprising a measuring slit (2) exhibiting measuring areas (6, 7) for measuring characteristics of a test sample which moves longitudinally, said measuring areas being associated to a measuring device. A coating (8) made of an abrasion-resistant material is applied over the whole measuring slit and its measuring areas (6, 7) in order to define more freely the dimensions of said measuring slit and especially to obtain a narrower measuring slit.Type: GrantFiled: March 22, 2001Date of Patent: December 31, 2002Assignee: Zellweger Luwa AGInventors: Cyrill Bucher, Roger Pidoux
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Patent number: 6430995Abstract: The invention relates to a method and a device for evaluating the quality of a yarn (1). In order that further aspects of the quality of a yarn may be taken into consideration and explained by measured values so that the quality of a yarn is as a whole substantially detectable, measured values relating on the one hand to the yarn exposed to friction and on the other hand to the yarn not exposed to friction are to be derived from the yarn. Both measured values are used to form a further measured value which represents a further qualitative feature.Type: GrantFiled: April 8, 1999Date of Patent: August 13, 2002Assignee: Zellweger Luwa AGInventor: Peter Feller
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Patent number: 6422072Abstract: The invention relates to a device for measuring properties of a longitudinally moved test material in a measuring cell. In order to provide a device which is easier to adapt to the requirements of a customer and to the special conditions of a production machine for longitudinally moved test material, the measuring cell (1) is connected to a processor (6), which is associated exclusively with the measuring cell.Type: GrantFiled: March 23, 1999Date of Patent: July 23, 2002Assignee: Zellweger Luwa AGInventors: Beat Emch, Rolf Joss, Felix Brunner, Bernhard Hitlebrand, Peter Schilling, Beat Keller, Hanspeter Wepfer
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Patent number: 6412342Abstract: The invention relates to a device for measuring properties of a textile test specimen in a measuring gap (2), in which the textile test specimen is introduced, the measuring gap being formed by two walls. In order to provide a device of the type described, with which adjustment of the guide is simplified and with which the test specimen is nevertheless guided with sufficient accuracy, there is provided in the measuring gap a guide element (15) for the test specimen, which is associated with a wall and adjusted in a stationary manner relative to said wall.Type: GrantFiled: March 15, 1999Date of Patent: July 2, 2002Assignee: Zellweger Luwa AGInventors: Jürg Zehr, Diego Madone, Walter Isotton
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Patent number: 6381941Abstract: A method and apparatus for cutting yarn (9) on a textile machine having a blade (6) which is supplied with kinetic energy via a drive (2, 3, 4). To be able to generate at all times a sufficient yet not excessive cutting power the kinetic energy is delivered in doses and rated in accordance with properties of the yarn and/or device. The drive thus comprises a device (14) for rating the kinetic energy of the blade.Type: GrantFiled: March 13, 2001Date of Patent: May 7, 2002Assignee: Zellweger Luwa AGInventor: Cyrill Bucher
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Patent number: 6374152Abstract: In a method and a device for clearing yarn, properties of the yarn are acquired and used to determine a yarn defect density profile. Yarn defects to be removed are defined by means of an adjustable clearing limit which is based on the density profile. In order to provide an optimum adjustment as frequently as possible, the clearing limit is automatically adjusted on the basis of the acquired properties in a control loop.Type: GrantFiled: April 23, 1998Date of Patent: April 16, 2002Assignee: Zellweger Luwa AGInventors: Hanspeter Wepfer, Johannes Heusser, Enrico Biondi
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Patent number: 6346819Abstract: The invention relates to a method and a device for determining proportions of solid matter in a test material. In order to reliably and easily determine proportions of solid matter in a test material, even in the case of transparent matter or matter of a similar color to the test material, the test material is exposed to an electric field and dielectric properties of the field are determined with the test material present. Two electrical quantities are determined from the dielectric properties and combined, resulting in a characteristic value which is independent of the mass of the test material. The characteristic value is compared with a previously determined characteristic value for the matter in question and the proportion of solid matter is determined therefrom.Type: GrantFiled: December 16, 1998Date of Patent: February 12, 2002Assignee: Zellweger Luwa AGInventors: Rolf Joss, Paul Geiter
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Patent number: 6343508Abstract: The invention relates to a method for representing properties of elongated textile test specimens such as yarns, rovings and ribbons. In order to create a method which makes values of parameters or measurement results in general ascertainable at a glance even in large numbers and nevertheless also takes differentiated account of critical and less critical parameters or measurement results, values of parameters are plotted along axes which are arranged inclined or substantially concentric relative to one another. A parameter is preferably also represented as a segment (31-36) of a circle, wherein the angle between two axes which intersect in the center of the circle and bound the segment is proportional to the importance of the parameter in a predetermined connection and the radius of the segment is proportional to the measured value for the parameter.Type: GrantFiled: July 22, 1998Date of Patent: February 5, 2002Assignee: Zellweger Luwa AGInventor: Peter Feller
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Patent number: 6244030Abstract: The invention relates to a process and device for monitoring the quality of yarns. In order to differentiate extraneous materials in a yarn section front the yarn itself and from other extraneous materials more effectively, a signal (10) derived from the yarn (8) must be classified in a classification field (16). On the basis of that classification, the extraneous materials contained in the yarn and their types can be determined.Type: GrantFiled: February 24, 1999Date of Patent: June 12, 2001Assignee: Zellweger Luwa AGInventors: Werner Arb, Christoph Färber
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Patent number: 6243166Abstract: The invention relates to a method and a device for detecting impurities (F) in a fiber stream (1) of mainly textile fibers, wherein the fiber stream and at least one reference quantity (15) are artificially visually sensed. To enable even impurities which are difficult to detect to be removed with improved efficiency, the reference quantity is to be adapted at least periodically.Type: GrantFiled: December 31, 1998Date of Patent: June 5, 2001Assignee: Zellweger Luwa AGInventor: Peter F. Aemmer
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Patent number: 6219135Abstract: The invention relates to a device and a method for the optical recording of at least one parameter on a longitudinally moved thread-type material. To enable parameters such as the diameter of a thread-type material, the diameter of a yarn package, the hairiness of a yarn etc. to be determined more simply and more accurately, an optical sensor composed of at least two individual sensors (30), in which at least one individual sensor is so constructed and arranged that at least one measured value is recorded digitally for a parameter, is to be used to record in parallel from the material at least two signals, one at least of which is clocked.Type: GrantFiled: June 29, 1999Date of Patent: April 17, 2001Assignee: Zellweger Luwa AGInventors: Rolf Hensel, Hans Wampfler, Jeffrey Mitchell Raynor, Peter Markus Seitz
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Patent number: 6199289Abstract: The invention concerns a device for measuring the thickness and or unevenness of wadding or non-wovens. The device has a guide element (30) for the wadding or non-wovens and a thickness sensor (26, 27, 28) which presses the wadding or non-wovens against the guide element and can move relative to the latter, the position of the sensor providing a measure of the thickness and/or unevenness of the wadding or non-wovens. To achieve a simpler and cheaper design without sacrificing measurement accuracy, an individual sensor is provided with a translation element (31) which converts the deflections of the individual sensor in one direction into a path signal available in another direction. This allows signals corresponding to the deflections of several individual sensors to be added together and applied to a single common path measurement system (32).Type: GrantFiled: November 19, 1998Date of Patent: March 13, 2001Assignee: Zellweger Luwa AGInventor: François Baechler
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Patent number: 6155037Abstract: A revolving body (1) with a circumferential surface (2) and two end faces is provided for inserting twist into a midportion of a longitudinally moving elongate strand of filamentary material. In order to produce a revolving body into which the elongate strand can be introduced very easily and which is also suitable for automated introduction of the strand, this body is provided with a groove which is open towards the circumferential surface and the end face so as to take up the elongate strand in the region of a longitudinal axis and is configured to deflect the strand away from the longitudinal axis.Type: GrantFiled: December 2, 1998Date of Patent: December 5, 2000Assignee: Zellweger Luwa AGInventor: Diego Madone
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Patent number: 6112508Abstract: 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.Type: GrantFiled: December 7, 1998Date of Patent: September 5, 2000Assignee: Zellweger Luwa AGInventor: Ernst Felix
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Patent number: 6072319Abstract: The disclosure relates to a device for measuring properties of a textile product in a measuring gap in which the textile product is inserted. On each of its surfaces the measuring gap has an electrode of a measuring capacitor, between which the product is inserted, an electrode of a compensation capacitor and a conductor. Disturbing influences can be effectively compensated by this arrangement.Type: GrantFiled: December 18, 1998Date of Patent: June 6, 2000Assignee: Zellweger Luwa AGInventor: Markus Schoni
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Patent number: RE39655Abstract: A process for the air conditioning of a weaving machine includes generating, for the weaving machine, at least one conditioning air stream spaced from a warp of the weaving machine and directed towards the warp, and distributing the conditioning air stream in stages so as to form a downwardly directed displacement-type flow towards threads of the warp. The displacement-type flow is a non-turbulent, uniform flow over a cross-sectional profile of the flow.Type: GrantFiled: September 22, 1992Date of Patent: May 29, 2007Assignee: Zellweger Luwa AGInventors: Pavel Verner, Walter Bollier