EP3613884A1 - Verfahren zur messung des fadenverbrauchs für speicherschussfadenzuführvorrichtungen - Google Patents
Verfahren zur messung des fadenverbrauchs für speicherschussfadenzuführvorrichtungen Download PDFInfo
- Publication number
- EP3613884A1 EP3613884A1 EP19183859.8A EP19183859A EP3613884A1 EP 3613884 A1 EP3613884 A1 EP 3613884A1 EP 19183859 A EP19183859 A EP 19183859A EP 3613884 A1 EP3613884 A1 EP 3613884A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drum
- instant
- reserve
- yarn
- winding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000009825 accumulation Methods 0.000 title claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 29
- 239000004753 textile Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000009940 knitting Methods 0.000 description 4
- 230000000670 limiting effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 208000024891 symptom Diseases 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/38—Devices for supplying, feeding, or guiding threads to needles
- D04B15/48—Thread-feeding devices
- D04B15/482—Thread-feeding devices comprising a rotatable or stationary intermediate storage drum from which the thread is axially and intermittently pulled off; Devices which can be switched between positive feed and intermittent feed
- D04B15/486—Monitoring reserve quantity
Definitions
- the present invention relates to a method for measuring the consumption of yarn for accumulation weft feeders.
- a generic textile machine can be fed with a plurality of yarns unwinding from respective weft feeders known as "accumulation weft feeders".
- an accumulation weft feeder comprises a drum adapted to carry a plurality of yarn loops that form a reserve and are wound thereon.
- the yarn which is picked up from an upstream spool, can be wound on the drum by a motorized flywheel, or the drum itself is rotated in order to wind the yarn thereon.
- the period of time taken into consideration can be, for example, the one necessary for the production of the entire item in the case of machines for manufacturing hosiery items, in which the time for completing an item is on the order of one minute, or the one that corresponds to a few dozen machine rotations in the case of large-diameter machines, which are designed for productions that require longer times.
- the purposes of the measurement can be different according to the applications.
- a known method for measuring yarn consumption provides for counting the loops that unwind from the drum in a specific period of time, based on the signal received by an unwinding sensor provided on some feeders.
- This unwinding sensor generates a pulse for each unwound loop or, if there are multiple sensors arranged equidistantly around the drum for a more precise measurement, for each loop fraction.
- the number of pulses generated by the length of the loop which corresponds to the circumference of the drum
- the loop fraction By multiplying the number of pulses generated by the length of the loop (which corresponds to the circumference of the drum) or of the loop fraction, the amount of yarn picked up is obtained.
- Another known method for measuring the consumption of yarn entails the counting of the loops that are wound on the drum in a given period of time on the basis of the signal received from a winding sensor, which is instead present on all accumulation weft feeders.
- Winding sensors are more reliable than unwinding sensors because they do not provide for an interaction with the yarn but calculate the turns performed by the flywheel or by the drum in the winding step.
- the weft feeder adjusts the unwinding speed of the yarn so as to keep the reserve present on the drum as constant as possible. Therefore, if the measurement is performed while the rate of absorption of the yarn is substantially constant, it is fair to assume that the amount of weft wound on the drum is approximately equal to the amount of weft that is unwound. Conversely, in particularly critical operating conditions, with the yarn consumption rate that varies continuously during the production of the item and frequent stops/restarts of the feeder, the measurement of consumption by means of said method is anything but realistic.
- the aim of the present invention is to provide a method for measuring the consumption of yarn for accumulation weft feeders that is more reliable and precise than known systems, even in particularly critical operating conditions, and can be applied also to feeders lacking a yarn unwinding sensor.
- Figure 1 shows schematically an accumulation weft feeder to which the method according to the invention is applied.
- a generic accumulation weft feeder 10 for textile machines is provided with a drum 12 and with winding means which, in the embodiment described herein, comprise a flywheel 14 turned about the axis of the drum 12 by a motor 15 in order to pick up yarn F from a spool 16 and wind it onto the drum 12 so as to form a reserve R.
- the yarn F unwinds from the drum 12 upon request from a generic downstream textile machine, such as a circular knitting machine 17.
- the feeder 10 is conventionally provided with at least one winding sensor S1, preferably a Hall sensor, arranged to detect the passage of magnets such as M which are integral with the flywheel 14 and to generate corresponding winding pulses WP for each loop or loop fraction (depending on the number of winding sensors) that is wound onto the drum 12; with a weft reserve sensor S2, preferably a mechanical sensor, which provides a binary information regarding the presence or not of a minimum amount of reserve at an intermediate point P0 of the drum 12, switching its state when the reserve ends at said intermediate point; and with at least one unwinding sensor S3, preferably an optical sensor, which generates an unwinding pulse UWP per each loop or fraction of a loop (depending on the number of unwinding sensors) that unwinds from the drum 12.
- a winding sensor S1 preferably a Hall sensor, arranged to detect the passage of magnets such as M which are integral with the flywheel 14 and to generate corresponding winding pulses WP for each loop or loop fraction (depending on the number of wind
- the weft feeder 10 is provided with a control unit CU which is programmed to adjust the winding speed of the flywheel 14 on the basis of the signal received from the weft reserve sensor S2, so as to keep the amount of reserve present on the drum 12 substantially constant on a desired value.
- the estimated reserve amount when the reserve ends exactly at the weft reserve sensor S2, it will be increased by a value equal to +1*C if a pulse is received from the winding sensor S1, +2*C if two pulses are received from the winding sensor S1, etc..
- the estimated reserve amount will be reduced by a value equal to -1*C if a pulse is received from the unwinding sensor S3, -2*C if two pulses are received from the unwinding sensor S3, etc..
- the estimated reserve amount is continuously updated during operation while the control unit CU, in a per se known manner, adjusts in real time the speed of the flywheel 14 so that the estimated reserve amount remains always close to the zero value.
- the amount of estimated reserve has a negative value, for example, -1*C
- the winding speed will be increased, whereas if it has a positive value, for example, +2*C, it will be reduced.
- the amount of yarn that corresponds to a winding pulse is equal to the amount of yarn that corresponds to an unwinding pulse, but of course the two amounts might be different. For example, if there is only one winding sensor and there are two unwinding sensors, each winding pulse would correspond to the passage of a complete loop, while each unwinding pulse would correspond to the passage of half of a loop.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Knitting Machines (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102018000007909A IT201800007909A1 (it) | 2018-08-07 | 2018-08-07 | Metodo di misurazione del consumo di filato per alimentatori di trama ad accumulo |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3613884A1 true EP3613884A1 (de) | 2020-02-26 |
EP3613884B1 EP3613884B1 (de) | 2021-08-25 |
Family
ID=63965930
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19183859.8A Active EP3613884B1 (de) | 2018-08-07 | 2019-07-02 | Verfahren zur messung des fadenverbrauchs für speicherschussfadenzuführvorrichtungen |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3613884B1 (de) |
IT (1) | IT201800007909A1 (de) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2592032A1 (de) * | 2011-11-11 | 2013-05-15 | B.T.S.R. International S.p.A. | Verbesserte Garnvorrats- und -zuführvorrichtung |
EP2907906A1 (de) * | 2014-02-13 | 2015-08-19 | L.G.L. Electronics S.p.A. | Bestandskontrollverfahren für einen Speichergarnzuführer mit Drehtrommel |
-
2018
- 2018-08-07 IT IT102018000007909A patent/IT201800007909A1/it unknown
-
2019
- 2019-07-02 EP EP19183859.8A patent/EP3613884B1/de active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2592032A1 (de) * | 2011-11-11 | 2013-05-15 | B.T.S.R. International S.p.A. | Verbesserte Garnvorrats- und -zuführvorrichtung |
EP2907906A1 (de) * | 2014-02-13 | 2015-08-19 | L.G.L. Electronics S.p.A. | Bestandskontrollverfahren für einen Speichergarnzuführer mit Drehtrommel |
Also Published As
Publication number | Publication date |
---|---|
IT201800007909A1 (it) | 2020-02-07 |
EP3613884B1 (de) | 2021-08-25 |
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