Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1994-12-29
1997-10-28
Hofsass, Jeffrey
Communications: electrical
Condition responsive indicating system
Specific condition
34082523, 364470, 57264, 57 5884, G08B 2100
Patent
active
056821468
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method of monitoring the quality of an advancing yarn during the production or processing of the yarn.
U.S. Pat. No. 4,720,702 discloses a method of monitoring the yarn tension at each of a plurality of yarn texturing stations, while continuously determining the mean value of the monitored tension at each station and while also continuously determining the differential between the monitored value and the mean value. Also, an alarm signal is generated whenever the mean value, or the differential value, leaves a predetermined tolerance range.
The significance of the known method lies in that, in a texturing process, the yarn tension is continuously determined, and that by evaluating the yarn tension, however, it is not the progression of the process that is determined, but the quality of the yarn processed by the texturing method. This is based on the experience that the yarn tension, which is measured in the texturing process downstream of the false twist friction unit, allows with a certain evaluation of the yarn tension to draw conclusions as to the quality of the produced yarn, without defining, determining and gathering those process parameters, which are causal for the quality or absence of quality.
It is therefore the object of this invention to determine by evaluation of the yarn tension which is continuously measured in the course of the production and/or processing of a yarn, the causes of non-conformities, which affect the quality of the yarn.
SUMMARY OF THE INVENTION
The above and other objects and advantages of the present invention are achieved by the provision of a method of monitoring the quality of an advancing yarn which comprises the steps of determining a characteristic progression of the yarn tension resulting from at least one non-conformity in the quality of the yarn, storing at least significant features of the determined progression as a non-conformity record in a data memory, then continuously monitoring the tension of the advancing yarn while continuously comparing the measured yarn tension with the non-conformity record, and generating a signal whenever a progression of the measured yarn tension shows a similarity to the stored non-conformity record, so as to indicate the occurrence of a quality non-conformity and permit the identification thereof.
According to the present invention, a portion of the graphic record of the yarn tension, the progression of which is symptomatic of certain, defined non-conformities, is stored as a pattern for this non-conformity (failure record), and subsequently compared with the progression of the yarn tension. The term non-conformity is understood to mean a certain defect, trouble, error, fault or failure of the yarn tension which is different from a conformity state, i.e. a normal one. In this comparison, it is recognized that the progression of the yarn tension in the course of time does not recur identically, when a certain non-conformity occurs, but only with certain characteristics. In one embodiment of this invention, the failure records are therefore not stored as a defined function, but in a typified form, a possible scattering of the progression of the yarn tension in the course of time being taken into account. This means that the characteristic progression of the yarn tension is stored, when a certain non-conformity occurs, but with such a lack of definition or tolerance (non-conformity pattern) that the non-conformity pattern is still indicative of the non-conformity with an adequate certainty, whereas, on the other hand, it still covers as many forms of the non-conformity record as possible in the case of the non-conformity concerned.
In a second embodiment of the invention, the non-conformity record may be stored in form of the directly measured record. In this instance, criteria of similarity which have formed the basis for the comparison between the non-conformity record and yarn tension record, are input in the computer separately (comparison logic), and superimpose
REFERENCES:
patent: 3731069 (1973-05-01), Goto et al.
patent: 4256247 (1981-03-01), Loepfe
patent: 4306231 (1981-12-01), Bagnall
patent: 4415008 (1983-11-01), Keller
patent: 4476901 (1984-10-01), Sainew
patent: 4656465 (1987-04-01), Erni
patent: 4720702 (1988-01-01), Martens
patent: 4774673 (1988-09-01), Aemmer
patent: 4951030 (1990-08-01), Jones
patent: 5017911 (1991-05-01), Muller
patent: 5018390 (1991-05-01), Muller
patent: 5055829 (1991-10-01), Stuttem
patent: 5164710 (1992-11-01), Anderegg
Barmag AG
Hofsass Jeffrey
Wong Albert K.
LandOfFree
Method of monitoring an advancing yarn does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of monitoring an advancing yarn, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of monitoring an advancing yarn will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1028675