EP0094099A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Loom control system
Assignee: Iro AB
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Filing: 1983-05-11
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Granted: —
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Expires: 2003-05-11
Abstract
Abstract The present invention relates to a loom control system operable to stop the loom in the presence of a yarn breakage. This loom comprises a feeding device 1 having a yarn storage drum 2 for temporarily storing the yarn and a yarn store sensor 6-9, 20, 30 sensing the quantity of yarn stored on the drum of the feeding device for transmitting an electric sensor signal representing the quantity of yarn stored on the drum to the feeding device to control the operation of the feeding device and to thereby control the quantity of yarn stored on the drum. Prior art loom control systems required complicated, costly and unreliable sensors for detecting whether a yarn breakage has occured or not. The present invention improves this state of art by providing a loom control system of the above-mentioned kind with a monitor means being electrically connected to the yarn store sensor for receiving the sensor signal, wherein said monitor means derives information on yarn breakage before and/or after the feeding device from said sensor signal or its variation with respect to the time to generate a stop signal for the loom.
Inventors
- 👤 Jerker Hellström
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 16:05
CPC Classifications
D; D03; D03D; D03D51/00; D03D51/18; D03D51/34; D03D47/00; D03D47/34; D03D47/36; D03D47/361; D03D47/367
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
167 words
Loom control system operable to stop the loom in the presence of a yarn breakage, said loom comprising a feeding device (1) having a yarn storage drum (2) for temporarily storing the yarn and a yarn store sensor (6-9, 20,30) sensing the quantity of yarn stored on the drum of the feeding device for transmitting an electric sensor signal representing the quantity of yarn stored on the drum to the feeding device to control the operation of the feeding device and to thereby control the quantity of yarn stored on the drum, said loom control system comprising a monitor means (10) for stopping the loom in case of a yarn breakage, characterized in that the monitor means (10) is electrically connected to the yarn store sensor for receiving the sensor signal, and that said monitor means derives information on yarn breakage before and/or after the feeding device from said sensor signal or its variation with respect to the time to generate a stop signal for the loom.
Claim 2
Dependent Claim
167 words
Loom control system operable to stop the loom in the presence of a yarn breakage, said loom comprising a feeding device (1) having a yarn storage drum (2) for temporarily storing the yarn and a yarn store sensor (6-9, 20,30) sensing the quantity of yarn stored on the drum of the feeding device for transmitting an electric sensor signal representing the quantity of yarn stored on the drum to the feeding device to control the operation of the feeding device and to thereby control the quantity of yarn stored on the drum, said loom control system comprising a monitor means (10) for stopping the loom in case of a yarn breakage, characterized in that the monitor means (10) is electrically connected to the yarn store sensor for receiving the sensor signal, and that said monitor means derives information on yarn breakage before and/or after the feeding device from said sensor signal or its variation with respect to the time to generate a stop signal for the loom.
Claim 3
Dependent Claim
83 words
Loom control system as claimed in claim 1, characterized in that the yarn store sensor (20,30) is arranged to generate a sensor signal indicating whether or not the quantity of stored yarn is below a minimum threshold that the monitor means (10, 21-27) measures the period of time during which the sensor signal indicates that the quantity of stored yarn is continuously below this minimum threshold, and that the monitor means stops the loom, if the measured time exceeds a predetermined time threshold.
Claim 4
Dependent Claim
129 words
Loom control system as claimed in claim 1 or 2, wherein the feeding device (1) is controlled to essentially continuously feed the yarn to the drum (2), characterized in that the yarn store sensor (30) is an analog sensor, that the sensor signal thereof is proportional to the quantity of yarn stored on the drum, that the monitor means (10, 31,36) generates a gradient signal representing the first derivation of the sensor signal with respect to the time, that in case said gradient signal being negative indicating a decreasing quantity of yarn stored on the drum the monitor means compares the absolute value of this negative gradient signal with a predetermined gradient threshold, and that the monitor means stops the loom, if said absolute value exceeds said gradient threshold.
Claim 5
Dependent Claim
103 words
Loom control system as claimed in one of claims 1 to 3, characterized in t that the yarn store sensor (30) is an analog sensor, that the sensor signal thereof is proportional to the quantity of yarn stored in the drum (2), that the monitor means (10, 31, 32, 40, 34, 35, 36) generates a gradient signal representing a first derivation of the sensor signal with respect to the time, that the monitor means measures the period of time during which said gradient is continuously negative, and that the monitor means stops the loom, if said measured time exceeds a predetermined time threshold.
Claim 6
Dependent Claim
175 words
Loom control system as claimed in one of claims 1 to 4, wherein the feeding device (1) is controlled to essentially continuously feed the yarn to the drum (2) characterized in that the yarn store sensor (30) is an analog sensor, that the sensor signal thereof is proportional to the quantity of yarn stored on the drum, that the monitor means (31, 32, 46, 40, 34, 35, 36) generates a gradient signal representing the first derivation of the sensor signal with respect to the time, that the loom control system comprises a sensor (45) for generating a yarn insertion signal representing whether or not a weft yarn insertion takes place, that the monitor means measures the time during which said insertion signal indicates that no weft yarn insertion takes place, that the monitor means stops this measurement of time, if the gradient signal changes from negative gradient signal to a zero signal or to a positive gradient signal, and that the monitor means stops the loom, if said measured time exceeds a predetermined time threshold.
Claim 7
Dependent Claim
143 words
Loom control system as claimed in one of claims 1 to 5, wherein the feeding device (1) is controlled to essentially continuously feed the yarn to the drum (2) characterized in that the yarn store sensor (30) is an analog sensor, that the sensor signal thereof is proportional to the quantity of yarn stored on the drum, that the monitor means (31, 32 46, 35, 36) generates a gradient signal representing the first derivation of the sensor signal with respect to the time, that the loom control system comprises a sensor 45 for generating a yarn insertion signal representing whether or not a weft yarn insertion takes place,and that the monitor means stops the loom, if the following two conditions are simultaneously fulfilled: a) the gradient signal is positive, and b) the yarn insertion signal indicates that a weft yarn insertion takes place.
References Cited (Backward Citations)
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