US3862473A - Control of the filling level of silver reservoirs in the textile industry - Google Patents

Control of the filling level of silver reservoirs in the textile industry Download PDF

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Publication number
US3862473A
US3862473A US317771A US31777172A US3862473A US 3862473 A US3862473 A US 3862473A US 317771 A US317771 A US 317771A US 31777172 A US31777172 A US 31777172A US 3862473 A US3862473 A US 3862473A
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Prior art keywords
sliver
filling level
reservoir
machine
minimum
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Expired - Lifetime
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US317771A
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English (en)
Inventor
Ernst Felix
Peter Feller
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Zellweger Uster AG
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Zellweger Uster AG
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Publication date
Priority to CH1879671A priority Critical patent/CH546285A/xx
Priority to DE722220834A priority patent/DE2220834C3/de
Priority to GB4433172A priority patent/GB1400246A/en
Priority to FR7235487A priority patent/FR2164564B1/fr
Application filed by Zellweger Uster AG filed Critical Zellweger Uster AG
Priority to US317771A priority patent/US3862473A/en
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Publication of US3862473A publication Critical patent/US3862473A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H51/00—Forwarding filamentary material
    • B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments
    • B65H2701/311—Slivers

Definitions

  • a method and apparatus for standardizing the cross section or weight per unit length of a sliver produced by a textile machine which supplies material to a sliver reservoir includes the correcting of long-term fluctuations in the material at the outlet of the machine by controlling the supply of material at the inlet of the machine and the correcting of short-term fluctuations in the material at the outlet of the machine by variably drafting the material at the outlet of the machine.
  • a minimum filling level and a lower than minimum filling level of the sliver reservoir is monitored so that the short-term fluctuations may be controlled in response to the minimum filling level and the long-term fluctuations may be controlled in response to the lower than minimum filling level of the sliver reservoir.
  • the average filling level of the reservoir is controlled on the basis of the size of the fluctuations in this filling level.
  • This invention relates to the control of the filling level of sliver reservoirs in the textile industry.
  • Sliver reservoirs are commonly used for equalisation between the delivery of an intermediate product from one production machine and the pickup of this intermediate product by the following machine.
  • the sliver reservoirs need only contain a relatively small sliver reserve, whereas in the case of production lines with highly fluctuating production, these sliver reservoirs have to be kept suitably filled.
  • a machine of this kind is an adjustable card which incorporates two types of regulating system,'namely a first for eliminating prolonged or long term fluctuations in the form of a controlled variable rotational speed of the feed roller, and a second for standardising short-term fluctuations which acts on the card sliver in the form of a draft means.
  • a sliver reservoir is required between a front roller of the draft means with variable speed for regulating purposes and the feed means delivering the sliver to the sliver coiler which is driven at a constant speed, to equalise the fluctuations in production of the card sliver due to the regulation.
  • the sliver reservoir requires a monitoring means which prevents excessive fillings or excessive removal of sliver. Since the effect of the sliver reservoir is intended to be satisfactory under all the working conditions occurring, the average filling level has to be so high that, in even the most unfavourable case, complete emptying never occurs.
  • a sliver reservoir is attended by the serious disadvantage that if the sliver reservoir is overfull the sliver to be removed from the reservoir has to be withdrawn with a relatively thick layer of sliver piled on top so that due to its loose cohesion it is readily damaged or torn.
  • the invention accordingly provides a method of controlling the filling level of a sliver reservoir in the textile industry, especially in spinning, in which the average filling level of the sliver reservoir is controlled on the basis of the size of the fluctuations in this filling level.
  • the invention also provides an apparatus for carrying out this method, comprising at least one sensor for detecting a minimum quantity of sliver in the reservoir and means for controlling the quantity of sliver delivered to and/or removed from the sliver reservoir on the basis of the signal released by the sensor.
  • FIG. 1 is a graph of a number of statistical distributions
  • FIG. 2 is another graph of statistical distributions in another arrangement
  • FIG. 3 diagrammatically illustrates the principle of a sliver reservoir with a sensor for the filling level
  • FIG. 4 is a graph illustrating a controlled filling level
  • FIG. 5 is a block diagram illustrating the connection of the sensor to the regulating mechanism
  • FIG. 6 is an enlarged detail from a graph illustrating a statistical distribution
  • FIG. 7 diagrammatically illustrates the principle of a sliver reservoir with a sensor for the filling level and a safety device
  • FIG. 8 is a block diagram illustrating the connection of another sensor to the regulating mechanism.
  • FIG. I is a frequency diagram illustrating the distribution of the filling of a sliver reservoir in a regulated textile machine, for example a card.
  • this frequency follows very closely a normal distribution so that the laws of statistics applying to the normal distribution can be applied at least approximately to this frequency.
  • the references 1, 2 and 3 denote different degrees of the coefficients of variation of the filling, curve 1 embodying a large coefficient of variation, curve 2 an average coefficient and curve 3 a very small coefficient of variation. All three degrees can occur in one and the same machine.
  • the average filling of the sliver reservoir would have to be fixed at such a value that, in the case of highly irregular material (curve 1), the state of complete emptying occurs so rarely that it can still be borne in practice. In the case of curve 1, this would be the value M.
  • curve 1 In the processing of a material with relatively small fluctuations in filling, for example according to curve 2 or even curve 3, complete emptying of the sliver reservoir would never occur in practice and the sliver would always have to be removed under an unnecessarily large quantity of sliver.
  • the average length of sliver present in the sliver reservoir could be selected smaller, the better the uniformity of the filling or its variation coefficient. Accordingly, it would always be possible to work with a minimum permissible filling if the variation coefficient of the filling were known, diminishing the problem of withdrawing the further-transported sliver under one or more layers of stored sliver.
  • the fluctuations in the filling level under consideration are a function of time. Accordingly, it is also permissible to express the remaining frequencies 11 as a time fraction of a predetermined, sufficiently large representative time interval.
  • FIG. 3 shows a first embodiment of the invention for controlling the filling level of a sliver reservoir.
  • the references l4, l5 and l6, l7 denote paired rollers of a drafting arrangement for a card sliver 10 whose draft is controlled, such as disclosed in copending application Ser. No. 286,865, filed Sept. 7, 1972, for example, on the basis of a measuring signal formed from the cross-section of the card sliver in a measuring unit 18.
  • the card sliver 10 is deposited in the actual sliver reservoir, the container 20, by a pair 19 of transporting rollers.
  • a second pair 21 of transporting rollers removes the card sliver 10 from the container 20 and delivers it, for example to a so-called can stock or sliver coiler, by way of a pair of rollers 22, filling the card sliver into spinning cans.
  • the location of the sliver reservoir is not of crucial significance to the control of the filling level of the sliver reservoir.
  • a first sensor 23 which always releases a certain electrical signal when, after leaving the pair of transporting rollers, the card sliver 10 falls downwards under its own weight. This function can be performed for example by a photocell arrangement known per se. If then the filling of the sliver reservoir 20 decreases (for a reason to be explained further on) to such an extent that the card sliver 10 no longer covers the bottom of the container 20, but passes with a free sag 10 from the pair of rollers 19 to the pair of rollers 21, the sensor 23 will respond.
  • FIG. 4 shows the path followed by the average filling level as a function of time. At the time t t t the sliver reservoir is empty to such an extent that the sensor 23 releases a signal. This in turn releases the increased follow-up until the flow of material returns to normal through disappearance of the signal. When the gradual emptying which begins again leads to release of the signal, the cycle is repeated in the manner described.
  • the supply of material controlled by the periodic response of the sensor 23 will also deposit a certain supply of sliver in the reservoir and use it up again at shorter time intervals. Accordingly, the average filling level remains low.
  • FIG. 5 is a diagrammatic plan view of a card with a feed roller 31 and the controlled drive 32 for the main cylinder, feed roller and doffer, the pairs 14-17 of drafting rollers with a rotational speed control 33, and a control unit 34 which converts the signals of the sensor 23 and of the measuring unit 18 into control commands for the controllable drives 32 and 33, respectively.
  • FIG. 6 shows the beginning of the branch of a normal distribution curve, that part of the filling which occurs in less than 1 percent of the random tests according to the filling level (or in less than 1 percent of a certain sufficiently long time interval) being limited to the abscissa 0.
  • the card sliver will tear in the absence of special measures because the offtake over the pair of rollers 21 is greater than the follow-up supplied by the pair of rollers 19.
  • the limit 0 is not identical with the limit at which the sliver would tear, instead it is even further to the left.
  • the probability value also falls appreciably, for example from I percent to 0.! percent. 1
  • the arrangement according to the invention functions in a balanced condition in such a way that the card sliver 10 issuing from the pair of rollers 19 passes between at least one sensor 23 and/or 24 and is run off by the pair of rollers 21.
  • the sensors are arranged in such a way that the first sensor 23 is influenced in the event of excessive sag of the card sliver 10 while the second, 24, is influenced in the event of excessive tension in the card sliver and releases a signal.
  • the signal released by the first sensor 23 regulates the delivery of fibrous material at the input 31 and hence a maximum filling level of the sliver reservoir 20 through the cross-sectional measurement of the card sliver 10 produced and the control of draft derived therefrom in the drafting arrangement 14-17.
  • the second sensor 24 acts as a limiting or safety means in those cases where the filling level would theoretically exceed a permitted minimum in order to avoid any interruption in the flow of material.
  • FIG. 8 is a diagrammatic plan view of a card followed by a regulated drafting arrangement, a sliver reservoir and a sliver coiler.
  • the second sensor 24 acts on the controllable drive 33 through the control unit 35. This influence on draft regulation in the case of response of the second sensor 24 has to take place without any delay because the sensor only comes into operation after the last sliver reserve has been used up and no more material is available for equalisation.
  • any type of sensor can be used for the sensors 23 and 24, for example mechanical sensors which are deflected by the card sliver, or photocells which have the advantage of being able to function as sensors in the absence of any contact. Capacitive sensors can also be used.
  • a method for standardizing the cross section or weight per unit length of a sliver produced by a textile machine including the steps of measuring the supply of material at the outlet of the machine, drafting the material at the outlet of the machine, correcting long-term fluctuations in the material at the outlet of the machine by controlling the supply of material at the inlet of the machine in response to the measured supply of material, correcting short-term fluctuations in the material at the outlet of the machine in response to the measured supply of material by altering the draft thereof, and adjusting the difference between the variable rate of the short-term correction operation and the rate of travel of the sliver by supplying said sliver to a sliver reservoir, the improvement comprising the steps of monitoring a minimum filling level and a lower than minimum filling level of the sliver reservoir and, as a result of such monitoring, controlling the long-term fluctuations in response to the lower than minimum filling level and controlling said correction of short-term fluctuations in response to the minimum filling level in such a way that the average filling level of the s
  • Apparatus as defined in claim 3 wherein-said second detection means includes a first sensor for detecting said less than minimum level in said sliver reservoir and for providing a signal in response thereto, said first control means being responsive to the signal from said first sensor for controlling said first regulating means to increase the quantity of sliver supplied to said sliver reservoir.
  • said first detection means includes a second sensor for detecting said minimum quantity of sliver in said sliver reservoir and for providing a signal in response thereto, said second control means being responsive to the signal from said second sensor for inhibiting said second regulating means to increase the supply of sliver to said sliver reservoir.

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  • Spinning Or Twisting Of Yarns (AREA)
  • Preliminary Treatment Of Fibers (AREA)
US317771A 1971-12-22 1972-12-22 Control of the filling level of silver reservoirs in the textile industry Expired - Lifetime US3862473A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CH1879671A CH546285A (de) 1971-12-22 1971-12-22 Verfahren und vorrichtung zur steuerung des fuellungsgrades von bandspeichern in der textilindustrie, insbesondere in spinnerei.
DE722220834A DE2220834C3 (de) 1971-12-22 1972-04-27 Arbeitsverfahren und Vorrichtung zur Steuerung des Füllungsgrades eines Bandspeichers bei Karden oder Krempeln
GB4433172A GB1400246A (en) 1971-12-22 1972-09-26 Control of the filling level of sliver reservoirs in the textile industry
FR7235487A FR2164564B1 (enrdf_load_stackoverflow) 1971-12-22 1972-10-06
US317771A US3862473A (en) 1971-12-22 1972-12-22 Control of the filling level of silver reservoirs in the textile industry

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1879671 1971-12-22
US317771A US3862473A (en) 1971-12-22 1972-12-22 Control of the filling level of silver reservoirs in the textile industry

Publications (1)

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US3862473A true US3862473A (en) 1975-01-28

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US317771A Expired - Lifetime US3862473A (en) 1971-12-22 1972-12-22 Control of the filling level of silver reservoirs in the textile industry

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US (1) US3862473A (enrdf_load_stackoverflow)
CH (1) CH546285A (enrdf_load_stackoverflow)
DE (1) DE2220834C3 (enrdf_load_stackoverflow)
FR (1) FR2164564B1 (enrdf_load_stackoverflow)
GB (1) GB1400246A (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938223A (en) * 1975-01-06 1976-02-17 Fiber Controls Corporation Auto leveler
US4100649A (en) * 1975-10-01 1978-07-18 Graf & Cie. A.-G. Method and apparatus for producing a uniform textile fiber sliver
US4275483A (en) * 1979-12-05 1981-06-30 Roberson James H Control apparatus for a carding machine
FR2534600A1 (fr) * 1982-10-13 1984-04-20 Truetzschler & Co Procede et dispositif de commande et/ou regulation d'une installation de preparation a la filature
EP0311831A1 (de) * 1987-10-08 1989-04-19 Maschinenfabrik Rieter Ag Regelung von Verarbeitungsstufen einer faserverarbeitenden Anlage
EP0410231A1 (de) * 1989-07-26 1991-01-30 Maschinenfabrik Rieter Ag Verfahren zum Aufrechterhalten einer vorgegebenen Bandqualität in einer Karde und/oder Strecke
US5272790A (en) * 1989-07-26 1993-12-28 Maschinenfabrik Rieter Ag Maintaining a predetermined quality of sliver in a card and/or drawframe
US5274883A (en) * 1991-11-26 1994-01-04 Hollingsworth (U.K.) Limited Carding apparatus with drafting and autolever device
US5377385A (en) * 1990-09-20 1995-01-03 Maschinenfabrik Reiter Ag Draw frame, storage device and coiler, delivery regulation
US5452626A (en) * 1993-03-12 1995-09-26 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device for the automatic adjustment of rotational speed ratios between operating elements of a draw frame
US5463556A (en) * 1992-06-17 1995-10-31 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device for control of an autoleveling draw frame
US5583781A (en) * 1991-06-04 1996-12-10 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device to correct the regulation onset point and the intensity of regulation
US5619773A (en) * 1993-01-25 1997-04-15 Rieter Ingolstadt Spinnereimaschinenbau Ag Draw frame
US6273314B1 (en) 1998-03-17 2001-08-14 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and apparatus for storage of fiber band between operating components of spinning machines
US20040029366A1 (en) * 2001-09-12 2004-02-12 Bernhard Jakoby Method for calculating a temporal level signal
US9873960B2 (en) * 2013-12-02 2018-01-23 Rieter Ingolstadt Gmbh Textile machine with variable tension draft
CN108349678A (zh) * 2015-11-03 2018-07-31 特吕茨施勒有限及两合公司 纤维条输运装置和可由此形成的布置结构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2147467A (en) * 1937-12-17 1939-02-14 Westinghouse Electric & Mfg Co Loop regulator
US2147421A (en) * 1937-03-06 1939-02-14 Westinghouse Electric & Mfg Co Speed regulator
US3184798A (en) * 1962-06-04 1965-05-25 Burlington Industries Inc System for processing textile fibers
US3403426A (en) * 1966-07-27 1968-10-01 Maremont Corp Textile sliver evening apparatus
US3703023A (en) * 1969-06-24 1972-11-21 Zinser Textilmaschinen Gmbh Apparatus for rendering textile slivers uniform

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2147421A (en) * 1937-03-06 1939-02-14 Westinghouse Electric & Mfg Co Speed regulator
US2147467A (en) * 1937-12-17 1939-02-14 Westinghouse Electric & Mfg Co Loop regulator
US3184798A (en) * 1962-06-04 1965-05-25 Burlington Industries Inc System for processing textile fibers
US3403426A (en) * 1966-07-27 1968-10-01 Maremont Corp Textile sliver evening apparatus
US3703023A (en) * 1969-06-24 1972-11-21 Zinser Textilmaschinen Gmbh Apparatus for rendering textile slivers uniform

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938223A (en) * 1975-01-06 1976-02-17 Fiber Controls Corporation Auto leveler
US4100649A (en) * 1975-10-01 1978-07-18 Graf & Cie. A.-G. Method and apparatus for producing a uniform textile fiber sliver
US4275483A (en) * 1979-12-05 1981-06-30 Roberson James H Control apparatus for a carding machine
FR2534600A1 (fr) * 1982-10-13 1984-04-20 Truetzschler & Co Procede et dispositif de commande et/ou regulation d'une installation de preparation a la filature
EP0311831A1 (de) * 1987-10-08 1989-04-19 Maschinenfabrik Rieter Ag Regelung von Verarbeitungsstufen einer faserverarbeitenden Anlage
US4876769A (en) * 1987-10-08 1989-10-31 Reiter Machine Works, Ltd. Regulation of processing stages of a fiber processing installation
US5274884A (en) * 1989-07-26 1994-01-04 Maschinenfabrik Rieter Ag Maintaining a predetermined quality of sliver in a card and/or drawframe
US5067202A (en) * 1989-07-26 1991-11-26 Maschinenfabrik Rieter Ag Method of maintaining a predetermined quantity of sliver in a card and/or drawframe
US5272790A (en) * 1989-07-26 1993-12-28 Maschinenfabrik Rieter Ag Maintaining a predetermined quality of sliver in a card and/or drawframe
EP0410231A1 (de) * 1989-07-26 1991-01-30 Maschinenfabrik Rieter Ag Verfahren zum Aufrechterhalten einer vorgegebenen Bandqualität in einer Karde und/oder Strecke
US5377385A (en) * 1990-09-20 1995-01-03 Maschinenfabrik Reiter Ag Draw frame, storage device and coiler, delivery regulation
US5583781A (en) * 1991-06-04 1996-12-10 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device to correct the regulation onset point and the intensity of regulation
US5274883A (en) * 1991-11-26 1994-01-04 Hollingsworth (U.K.) Limited Carding apparatus with drafting and autolever device
US5463556A (en) * 1992-06-17 1995-10-31 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device for control of an autoleveling draw frame
US5619773A (en) * 1993-01-25 1997-04-15 Rieter Ingolstadt Spinnereimaschinenbau Ag Draw frame
US5452626A (en) * 1993-03-12 1995-09-26 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and device for the automatic adjustment of rotational speed ratios between operating elements of a draw frame
US6273314B1 (en) 1998-03-17 2001-08-14 Rieter Ingolstadt Spinnereimaschinenbau Ag Process and apparatus for storage of fiber band between operating components of spinning machines
US20040029366A1 (en) * 2001-09-12 2004-02-12 Bernhard Jakoby Method for calculating a temporal level signal
US6924214B2 (en) * 2001-09-12 2005-08-02 Robert Bosch Gmbh Method for calculating a time-related fill level signal
US9873960B2 (en) * 2013-12-02 2018-01-23 Rieter Ingolstadt Gmbh Textile machine with variable tension draft
CN108349678A (zh) * 2015-11-03 2018-07-31 特吕茨施勒有限及两合公司 纤维条输运装置和可由此形成的布置结构
CN108349678B (zh) * 2015-11-03 2019-11-08 特吕茨施勒有限及两合公司 纤维条输运装置和可由此形成的布置结构

Also Published As

Publication number Publication date
DE2220834C3 (de) 1979-03-08
DE2220834A1 (de) 1973-07-05
DE2220834B2 (de) 1978-07-20
GB1400246A (en) 1975-07-16
FR2164564A1 (enrdf_load_stackoverflow) 1973-08-03
CH546285A (de) 1974-02-28
FR2164564B1 (enrdf_load_stackoverflow) 1976-08-13

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