Abstract:
Im Verfahren zur Erkennung einer periodischen Struktur in einem bewegten länglichen Textilmaterial (9) wird das Textilmaterial (9) gleichzeitig an mehreren entlang seiner Längsrichtung (91) äquidistant angeordneten Detektionsstellen (43.1-43.5) abgetastet. An den Detektionsstellen (43.1 -43.5) detektierte Abtastsignale werden zu einem Summensignal addiert. Aufgmnd von zeitlichen Änderungen des Summensignals wird auf eine periodische Struktur des Textilmaterials (9) geschlossen. Bei mehreren Gruppen von jeweils mehreren äquidistanten Detektionsstellen (43.1-43.5) kann praktisch ohne Rechenaufwand ein Ortsspektrum der Struktur des Textilmaterials (9) erhalten werden.
Abstract:
Techniques are described for maintaining synchronization of inspection data when a web roll is converted into intermediate smaller rolls prior to cutting the web into individual parts. A system comprises a database that stores anomaly data acquired from a manufactured web. The anomaly data specifies positions anomalies within a manufactured web relative to a set of fiducial marks on the manufactured web. A conversion processing line comprises a fiducial mark reader to output position information for the set of fiducial marks on the manufactured web, a slitter that cuts the manufactured web into slit rolls, and a fiducial mark printer to print a set of fiducial marks on each slit roll. A position monitoring system maintains spatial synchronization of the anomaly data by computing an updated position for the anomalies relative to the set of fiducial marks printed on the slit rolls.
Abstract:
A system (20) for the characterization of webs (30) that permits the identification of anomalous regions on the web to be performed at a first time and place, and permits the localization and marking of actual defects to be performed at a second time and place.
Abstract:
According to the present invention, a cloth (MA) unrolled from a rolled cloth (M) and spread and having at least laterally continuous patterns is fed downward with one longitudinal end thereof at the head via a feed means (4), and the surface of the downward extending portion of the cloth (MA) being fed downward is picked up by a CCD camera (5), an optical read means, the vertical position of the cloth (MA) being controlled on the basis of a signal from the CCd camera (5) so that the patterns on the cloth are lined up laterally, whereby it is rendered possible to carry out with very high reliability, accuracy and efficiency an operation, which has heretofore been found to be difficult to carry out, for matching the patterns on a cloth while removing curling such as skew and bend of the cloth by the weight of the cloth itself, and preventing the occurrence of imperfect products ascribed to the curling of the cloth.
Abstract:
A device determines the true feed transmitted by a feed device of an industrial sewing machine to the sewn material. The number of threads passing in front of a sensor is counted and the feed is derived from the predetermined thread density. In order to obtain a thread count of maximum precision irrespective of the orientation of the sewn material, a rotating slit diaphragm (7) with at least one parallel-edged radial slit (8) is arranged in front of the photoelectric cell (10) of the sensor. Preferably, a second, stationary slit diaphragm (5) whose angular position can nevertheless be varied comprises a slit (6) which opens over a certain angular range. The rotary slit diaphragm (7) has a larger number of slits (8). The required rotational speed of the rotary slit diaphragm (7) can therefore be reduced. To prevent errors due to the pattern of the fabric, the device can function in the relatively long infrared wavelength range.
Abstract:
Device for the optical determination of periodicities in textile bands, such as woven or knitted cloth, is provided with a light source for directing light radiation towards a band of cloth, a light detector for detecting light radiation reflected by the fabric and converting it into an electrical signal with varying intensity, and a signal processing circuit for determining periodicities related to the cloth and present in the electrical signal. Said signal processing circuit is constructed for counting threads or stitches and is provided with a high-frequency filter followed by a low-frequency filter for removing noise and low-frequency interference respectively from the said electrical signal and with an amplitude threshold stage with adjustable thresholds for assessing subsequent amplitudes. A measuring means is provided in said light source and light detector are combined into a single sensor (1) which is mounted next to one or two rollers (21, 22) mounted on a common spindle attached to a bracket (24), the roller(s) being pressed against the band of cloth (2). A tachometer (10) is coupled to one side of the common spindle to deliver a speed signal proportionate to the instantaneous roller speed, and an optical cell (25) is provided in one roller (21) to deliver a length pulse signal proportionate to the roller circumference.
Abstract:
The invention relates to a cleaning machine and a cleaning method for determining and cleaning/removing of neps formed on fabrics during production.
Abstract:
In a method for detecting a periodic structure in a moving elongated textile material (9), said textile material (9) (e.g. yarn) is sampled simultaneously at multiple detection points (43.1-43.5) located equidistantly in the longitudinal direction (91) of said material. Sampling signals that can be detected at the detection points (43.1-43.5) are added to form a composite signal (for example by means of an integrated optical waveguide structure.) Temporal changes in the composite signal are indicative of a periodic structure in the textile material (9). A localised spectrum of the structure of the textile material (9) can be obtained (Fourier spectrum) with multiple groups of multiple equidistant detection points (43.1-43.5) with practically no computational effort.