Boots – shoes – and leggings
Patent
1985-04-19
1988-09-27
Lall, Parshotam S.
Boots, shoes, and leggings
73160, 28187, 364507, 364552, 340677, G06F 1546, G06G 766
Patent
active
047746734
DESCRIPTION:
BRIEF SUMMARY
SUMMARY
In a method for monitoring yarn quality on a textile machine, the yarn pulses (55) obtained at the monitoring points in groups of for example every 24 monitoring points are first analysed for suspected faults cyclically in processes of a first category. The products of this analysis are from time to time transmitted together in batches to processes of a second category, in which decisions are made on action to be taken and warnings to be triggered, whereupon the products are in turn from time to time transmitted together in batches to processes of the first category and there the performance of the necessary action is triggered.
For fault analysis and processing in the start-up mode and in the initial stages of the steady mode of operation, a common special system is provided for the whole or a part of the textile machine, which is designed for the particular characteristics of this start-up mode of operation, with which the yarn pulses in the start-up mode are analysed.
Analyses for fault characteristics are performed periodically at a frequency corresponding approximately to the inverse ratio between the reference lengths of the corresponding fault characteristics, whereby the sensing rate is artificially reduced (decimated) and the signal analysis performed with the mean values obtained by decimation.
The layout is such that in satellites (53) connected to a central processor (51) via a communication channel (80) there is the system for fault analysis in the steady mode of operation, and in the central processor (51) there is the collective system for fault analysis in the start-up mode of operation.
The requirements of yarn clearer and yarn quality monitoring installations for unconventional spinning methods such as rotor spinning etc. differ from the requirements of conventional yarn clearer installations for ring-spun yarns on winding machines in the following points:
(a) Types of faults: In addition to well known yarn faults (short thick places, coarse yarns and thin places), periodic and aperiodic fault sequences, deviations from count and variations in yarn evenness can occur.
(b) Frequency of faults: These are per unit length, smaller by approximately a power of one, and per unit time, less frequent by approximately a power of two. (Yarn speed in unconventional spinning methods is about 10 times lower than in rewinding).
(c) Yarn lot size: One machine, typically comprising 200 and more spinning points, is always producing the same yarn quality on all spinning points, i.e. the spinning parameter values are set identically for all spinning points.
(d) Yarn joining, splicing: One machine, typically with 200 and more spinning points is patrolled by a single travelling joining machine, i.e. there is never more than one single joining process taking place at the same time.
(e) Function value of the monitoring length: Related to the spinning point, this is much smaller as a yarn length smaller by about a factor of one can be monitored per unit time and additionally the objectionable yarn faults are less frequency and consequently the potential resultant costs are on average smaller (see b).
It follows from the above that with a smaller function value and consequently with lower admissible sales prices and manufacturing costs, a solution must be found which satisfies high technical requirements with respect to detection of types of faults. The solution sought is less critical with respect to frequency per unit time of anticipated fault occurrence and on simultaneous occurrence of possible start-up acceleration processes (only one at a time).
Known attempts at a solution are based on the conventional structural composition of yarn clearer installations, where there is one measuring head provided for each machine position and each head has its own evaluation unit. The latter receives from a central control and supply unit the required operating power and control pulses for the relevant values of the set parameters and transmits to the unit (if equipped for the purpose) basic data or pulses for mac
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Lall Parshotam S.
Mattson Brian M.
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