WO2007062740A1 - Procede et dispositif de determination de la quantite de fil sur une machine a tricoter - Google Patents

Procede et dispositif de determination de la quantite de fil sur une machine a tricoter Download PDF

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Publication number
WO2007062740A1
WO2007062740A1 PCT/EP2006/010830 EP2006010830W WO2007062740A1 WO 2007062740 A1 WO2007062740 A1 WO 2007062740A1 EP 2006010830 W EP2006010830 W EP 2006010830W WO 2007062740 A1 WO2007062740 A1 WO 2007062740A1
Authority
WO
WIPO (PCT)
Prior art keywords
machine
delivery
pulses
pulse
thread
Prior art date
Application number
PCT/EP2006/010830
Other languages
German (de)
English (en)
Inventor
Karl-Heinz Mühlberg
Original Assignee
Memminger-Iro Gmbh
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Memminger-Iro Gmbh filed Critical Memminger-Iro Gmbh
Priority to EP06818486A priority Critical patent/EP1954861B1/fr
Priority to DE502006008857T priority patent/DE502006008857D1/de
Priority to CN2006800449334A priority patent/CN101316958B/zh
Publication of WO2007062740A1 publication Critical patent/WO2007062740A1/fr

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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

Definitions

  • the invention relates to a method for determining the yarn delivery to a circular knitting machine and a device for this purpose.
  • Circular knitting machines are generally produced by belt-driven positive feed devices, so-called feeders, supplied with thread.
  • Each feeder has for this purpose a yarn feed wheel, which is usually wrapped by the thread to be supplied several times.
  • the thread is thereby supplied slip-free to the circular knitting machine, wherein the amount of thread is predetermined by the rotation of the yarn feed wheel.
  • To drive the usually many yarn feeding devices and their yarn feed wheels is often a belt that drives all or at least a larger group of yarn feed wheels.
  • the belt is driven by a so-called quality wheel, which is - in the simplest case connected to the main drive of the circular knitting machine.
  • the quality wheel is an adjustable pulley.
  • DE 82 24 194 U1 proposes a measuring roller, which is to be positioned with a separate holder so that the belt driving the yarn feeding devices runs over the measuring roller.
  • the measuring roller carries a measuring disk which carries radially oriented and uniformly distributed along the circumference metallized strip. The strips are detected by a pickup head connected to a counting circuit. The count rate characterizes the thread speed and is electronically converted to the thread quantity per machine revolution.
  • the speed of the needle cylinder serves as an encoder, which emits a pulse for each revolution of the needle cylinder, for example.
  • the metallized areas of the measuring disk generate several pulses per revolution of the measuring roller.
  • the resolution of the measuring disk is relatively low. Therefore, several machine revolutions are usually required to obtain a sufficiently accurate reading for the yarn delivery amount. This should, based on a revolution of the yarn feed wheel, at least approximately one millimeter fixed.
  • the inventive method is applicable to circular knitting machines, which thread with positive, i. essentially supplying slip-free delivery devices.
  • at least one sensor is provided on the circular knitting machine, which emits at least one signal during one revolution of the machine cylinder.
  • the sensor is thus referred to as a machine pulse generator.
  • at least one delivery pulse generator is provided, which delivers supply pulses corresponding to the delivery of thread.
  • the delivery pulses are in a known ratio to the revolutions of the yarn delivery wheel of each yarn feeding device.
  • the delivery pulse is part of a positive thread supplying device, said device comprises one or more so-called yarn feeding devices, one or more drive belts and the so-called quality wheel.
  • the delivery pulse generator can be installed in at least one of the yarn delivery devices and can be installed there for each revolution of the yarn delivery wheel. just give a single impulse. However, it can also be designed so that it emits two or more pulses per revolution of the yarn feed wheel.
  • the delivery pulse generator can also be provided on a separate device which has a measuring roller connected to the drive belt and thus serves only to detect the belt speed. However, this is in a fixed relationship with the speed of the yarn feed wheels of the yarn feeding devices, so that also valid delivery pulses are obtained.
  • a refined resolution ie an apparent detection of angular increments on the yarn feed wheels, is achieved, at least during stationary operation of the knitting machine.
  • a valid value for the amount of yarn supplied per revolution of the machine can be calculated even for a fraction of a revolution of a machine cylinder. This value can be displayed or fed to further evaluation stages or control devices. Waiting several or many machine revolutions, which was previously required, is eliminated.
  • an intermediate pulse method embodying the invention it is possible to subdivide the intervals between two successive delivery pulses into a fixed number of individual steps.
  • the number is preferably set to be related to a desired length of thread of the length of, for example, one millimeter. This results in a simple evaluation.
  • the subdivision of the intervals can be purely mathematical or hardware by a corresponding electronic circuit.
  • the number of (synthetic) intermediate pulses produced in this way corresponding to the increments of the rotation of the yarn feeding wheels, is counted between two machine pulses, thus making one of the yarn lengths delivered per machine revolution more proportional Measured value is present.
  • the time intervals between two delivery pulses by respectively determining the interval between the machine pulse and the delivery pulse and the delivery pulse and the machine pulse.
  • This time interval is usually shorter than the time interval between two delivery pulses.
  • the yarn delivery quantity can also be determined from the times measured in this way.
  • the duration of a section of a truncated time interval must be related to the duration of the entire time interval or an adjacent non-truncated time interval.
  • a "truncated" time interval is understood to mean a time interval between two delivery pulses into which a machine impulse falls in.
  • a "non-trimmed" time interval is one in which no machine impulse falls.
  • the device whose evaluation device subdivides the time intervals between delivery pulses.
  • the division can be made by measuring the duration of cut off portions of the time intervals as well as by generating intermediate impulses take place.
  • the evaluation device may be part of a machine control, eg a circular knitting machine. However, it can also be provided as a separate device that can be connected to the knitting machine, for example.
  • Figure 1 shows a knitting machine with yarn feeding devices
  • FIG. 3 shows machine pulses and supply pulses from encoders or sensors which are provided on the knitting machine according to FIG. 1 and the yarn feeding device according to FIG.
  • FIG. 4 shows the pulse trains according to FIG. 3 in a time-expanded representation
  • Figure 5 is a block diagram of a device for dividing the intervals between delivery pulses in intermediate pulses (pulse-based interval division) and
  • Figure 6 is a diagram for explaining an alternative Interval separation method (time-based method).
  • FIG. 1 illustrates a circular knitting machine 1 which has a so-called needle cylinder 2 rotating about a vertical axis in operation, which is also referred to as a knitting cylinder.
  • a knitting cylinder Around the circumference of the needle cylinder 2 around are in an outer frame
  • Knit knobs 3 are fixed in place, which serve to move the rotation of the needle cylinder 2, the needles contained in this vertically up and down.
  • the resulting stationary knitting stations 4 yarns 5, 6, etc. supplied by means of a yarn feeding device.
  • the device 4 includes positive yarn feeding devices 7, 8, etc. supported by an annular carrier, a so-called machine ring 7, of which the yarn feeding device 7 will be described below as representative of the other devices.
  • the yarn feeding devices 7, 8, etc. are driven by a belt 9, which runs on the yarn feeding devices 7, 8, etc. provided pulleys.
  • To drive the belt 9 is e.g. an electric motor or, as is very often the case, a mechanically adjustable wheel in its circumference - a so-called quality wheel. This is e.g. connected via a gear or a shaft to the main drive of the knitting machine 1, which also serves to rotate the needle cylinder 2.
  • To the circular knitting machine 1 also includes a
  • Control device 10 which is connected to sensors and actuators on the circular knitting machine 1, which are not further illustrated in Figure 1.
  • the sensors include, for example, a machine pulse generator 11 and a delivery pulse generator 12, which are indicated schematically in FIG.
  • the machine pulse generator 11 is, for example, an optical or magnetic or otherwise acting encoder, for example, scans a provided on the needle cylinder 2 marking and Thus, with each revolution of the needle cylinder 2 via a line 13 a machine pulse to the controller 10 is. Accordingly, the delivery pulse generator 12 via a line 14 pulses to the control device 10, the speed of the belt 9 and thus the speed of the threads 5, 6, etc. characterize.
  • the delivery pulse generator 12 can also be a magnetic or otherwise trained transmitter, which, as illustrated in FIG.
  • the yarn delivery device 7 is accommodated, for example, directly on the yarn delivery device 7. It can be arranged on only one of the yarn feeding devices 7, 8, etc., on a plurality of the same or on all yarn feeding devices a delivery pulse. In the simplest case, one is enough.
  • the marking may be optical, magnetic or other physical nature.
  • teeth provided on the belt or perforations provided in the belt may be scanned. Every tooth or perforation can produce a delivery impulse. It is also possible to run the belt via a measuring wheel, the only function of which is to deliver at least one delivery pulse each revolution, which is registered by the control device 10.
  • the delivery device 7 has a holder 15 on which a vertically arranged shaft 18 is mounted via two bearings 16, 17. This carries at its upper end a pulley 19 and at its lower end a yarn feed wheel 20, the ura of the thread 5 with at least a few turns 21 is lukewarm.
  • the shaft 18 carries at least one of the Underimpulsgeber 12 scanned mark 22 so that at each revolution of the shaft 18 and the Fadenarrirads 20 at least one delivery pulse is generated.
  • the evaluation device 10 which can control the main drive of the circular knitting machine 1 via a line 23, has input means 24, e.g. in the form of a keyboard and usually also a display device 25, e.g. in the form of a display.
  • control device 10 may also be set up to determine the yarn length delivered per machine revolution, ie revolution of the needle cylinder 2, ie length of the yarn 5, 6, etc.
  • the control device 1 may be provided with suitable hardware and software, which is explained below on the basis of its function. This is apparent from Figures 3 and 4 in conjunction with Figure 5, which is an abstract illustration of a hardware solution.
  • the control device 10 is able to detect delivered amounts of thread, which amount to only a fraction of the circumference of the yarn feed wheel 20 and thus be delivered with less than a complete revolution of the shaft 18.
  • the delivery pulses provided by the delivery pulser 12 define intervals that are subdivided by the controller 10 into sub-intervals.
  • FIG. 4 The upper diagram illustrates machine pulses M, M 1 which appear in infinite repetition as long as the needle cylinder 2 rotates. This accounts for each revolution of the needle cylinder 2, a single pulse M, M 1 , etc. Synchronous with the Needle cylinder 2 rotates the shaft 18 of the yarn feeding device 7. This results in the supply pulses L 1 , L 2 , L N-1 , L N , L N + 1 illustrated below in FIG.
  • the pulses M, L 1 and L 2 are again illustrated in FIG. 4 in terms of time expansion.
  • the pulses M, L 1 and L 2 may have any suitable pulse shape. In the embodiment, rectangular pulses are assumed, with only their leading edges are marked. Alternatively, sawtooth pulses or other types of pulses may be used, with the vertical lines illustrated in FIGS. 3 and 4 each marking a selected feature of that pulse, for example its leading edge, trailing edge or vertex.
  • the machine pulse M generally does not coincide with the delivery pulses L 1 or L 2 . Rather, it is within the limited by the delivery pulses L 1 , L 2 interval T.
  • the interval T is now subdivided, for example by dividing it into a fixed number of individual steps E, which can be formed by intermediate pulses Z.
  • the interval T can be decomposed by 144 intermediate pulses into 144 intermediate intervals.
  • the individual steps E represent virtual increments of the rotation of the shaft 18 and thus of the yarn feed wheel 20. If the interval T is divided into 144 individual steps E and the circumference of the yarn feed wheel 20, i. the length of the winding 21, 144 mm is a single step E for a thread length of 1 mm.
  • a frequency-variable pulse generator 26 having an input 27 for receiving a control signal.
  • the signal applied to the input 27 may be a digital or an analogue signal. It may be in the form of electrical pulses or within a program in the form of a function value. It determines whether the pulse generator 26 maintains, increases or decreases its current frequency.
  • the pulse generator 26 has an output 28 at which it outputs its pulses. These are fed as intermediate pulses Z for further evaluation and at the same time to an input 29 of a frequency divider 30.
  • a counter can occur which, when a count value corresponding to the divider ratio is reached, outputs a signal at an output 31.
  • the signal applied to the output 31 coincides in frequency with the frequency of the supply pulses L N and is supplied to an input 32 of a phase and frequency comparator 33.
  • Another input 34 of the phase and frequency comparator 33 receives the delivery pulses L N.
  • the phase and frequency comparator 33 outputs a signal applied to the input 27 which causes the pulse generator 26 to maintain or change its output frequency depending on whether the phase and frequency of the supply pulses L N and Frequency divided output pulses of the pulse generator 26 coincide or not.
  • the controller 10 includes a module that counts the intermediate pulses Z in the limited by the machine pulses M and M 1 interval and this count value thus obtained then multiplied by the thread length associated with a single step E.
  • the product obtained represents the yarn length per machine revolution and can be displayed after only one machine revolution, ie after two machine pulses M and M 1 , marking the beginning and end of a machine revolution.
  • FIG. 1 A modified embodiment of the method according to the invention and thus of a correspondingly operating control device 10 is illustrated with reference to FIG.
  • the intervals T between individual delivery pulses L 1 , L 2 and L N and L N + 1 are subdivided by the machine pulses M or M 1 which fall into the relevant intervals T.
  • Figure 6 illustrates from the interval T, in each case a period of time t x and t N + 1 divided.
  • the control device 10 first of all distinguishes whether machine pulses M, M 1 fall within an interval T or not. If a machine pulse M or M 1 falls within such an interval, the duration of the interval T, ie the time which elapses from the delivery pulse L 1 to the delivery pulse L 2, is determined . In addition, the time t ⁇ , which elapses from the engine pulse M to the delivery pulse L 2, is measured. thereupon the measured time t 1 is compared with the duration of the interval T. The value obtained is a fraction less than one. This fraction is multiplied by the thread length of one revolution of the delivery wheel 20. The obtained value corresponds to the thread length which has been supplied from the time of the machine pulse M to the delivery pulse L 1 .
  • intervals T between the delivery pulses L 2 and L 3 , etc., up to the delivery pulses L N-1 , L N the intervals are only counted.
  • the time measurement started in each case at the beginning of the interval is terminated again at the end of the interval and the received measured value is discarded because no machine impulse has been detected within the interval.
  • the number of such registered intervals T is then in turn multiplied by the thread length, which is assigned to a single revolution of the yarn feed wheel 20.
  • the value thus obtained corresponds to the thread length delivered between the delivery pulses L 2 and L N. It is added to the value determined above, which has been determined for the time period t x .
  • the machine pulse M 1 falls into the interval beginning with the delivery pulse L N.
  • the corresponding time period t N is registered and set in relation to the interval duration obtained at the end of the interval.
  • the end of the interval is determined by the delivery pulse L N + 1 .
  • the ratio obtained is in turn multiplied by the yarn length delivered in a complete revolution of the yarn feed wheel 20 and added to the previously determined sum.
  • the sum obtained represents the total amount of yarn (or thread length) delivered between machine pulses M and M 1. It can be displayed immediately.
  • the method is relatively insensitive to changes in the speed of the needle cylinder 2.
  • the thread lengths contained in the trimmed intervals can be multiplied by a positive or negative correction factor.
  • a separate delivery pulse generator which is connected, for example, to a belt pulley 9 connected to the belt 9.
  • the diameter of this pulley may differ from the diameter of the pulley 19. It can deliver one or more delivery pulses per revolution.
  • the value of the yarn length delivered per revolution of the needle cylinder 2 determined by one of the aforementioned methods is then correctly obtained when it is multiplied by the control device 10 with a corresponding correction factor.
  • the value may be determined by calibration or calculation by multiplying the circumference of the yarn feed wheel 20 by the gear ratio between the pulley 19 and the other measuring pulley.
  • a machine pulse generator 11 which supplies at least one pulse at each revolution of the circular knitting machine 1.
  • a delivery pulse generator is provided which has a resolution which is significantly worse than 1 mm. For example, more than 100 mm finished thread just a delivery impulse.
  • the delivery pulse generator can be formed, for example, by an encoder which emits only one pulse during one revolution of a positively supplying yarn delivery wheel.
  • the intervals between delivery pulses are generated by virtual increments E by dividing the interval determined by two delivery pulses one or more times. Alternatively, the interval is divided into two by a machine pulse and measured in time. For this purpose, the interval duration and the
  • Both time periods are set in relation.
  • the ratio is multiplied by the resolution (eg 100 mm) in order to determine the thread length delivered in the cut interval.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)

Abstract

L'invention concerne un procédé de détermination de l’alimentation en fil à une machine à tricoter circulaire (1), selon lequel on prévoit un générateur (11) d'impulsions de machine qui délivre au moins une impulsion lors de chaque tour de la machine à tricoter circulaire (1). On prévoit en outre un émetteur d'impulsions de fourniture dont la résolution est nettement moins bonne que 1 mm. Par exemple, sur plus de 100 mm de fil fourni, seule une impulsion de fourniture est supprimée. Le générateur d'impulsions de fourniture peut par exemple être formé d'un générateur qui délivre une seule impulsion par tour d'une roue de fourniture positive de fil. Pour affiner et accélérer la mesure de longueur du fil, on crée des incréments virtuels en divisant une ou plusieurs fois l'intervalle défini entre deux impulsions de fourniture.
PCT/EP2006/010830 2005-12-01 2006-11-11 Procede et dispositif de determination de la quantite de fil sur une machine a tricoter WO2007062740A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP06818486A EP1954861B1 (fr) 2005-12-01 2006-11-11 Procede et dispositif de determination de la quantite de fil sur une machine a tricoter
DE502006008857T DE502006008857D1 (de) 2005-12-01 2006-11-11 Verfahren und einrichtung zur bestimmung der fadenmenge an einer strickmaschine
CN2006800449334A CN101316958B (zh) 2005-12-01 2006-11-11 用于在针织机上确定纱线量的方法和装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510057352 DE102005057352B3 (de) 2005-12-01 2005-12-01 Verfahren und Einrichtung zur Bestimmung der Fadenmenge an einer Strickmaschine
DE102005057352.5 2005-12-01

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Publication Number Publication Date
WO2007062740A1 true WO2007062740A1 (fr) 2007-06-07

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ID=37734239

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/010830 WO2007062740A1 (fr) 2005-12-01 2006-11-11 Procede et dispositif de determination de la quantite de fil sur une machine a tricoter

Country Status (5)

Country Link
EP (1) EP1954861B1 (fr)
CN (1) CN101316958B (fr)
DE (2) DE102005057352B3 (fr)
TW (1) TWI334402B (fr)
WO (1) WO2007062740A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2857567A1 (fr) * 2013-10-02 2015-04-08 Memminger-IRO GmbH Procédé et dispositif de surveillance de la production d'une machine à tricoter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012103535B3 (de) * 2012-04-20 2013-10-10 Memminger-Iro Gmbh Vorrichtung und Verfahren zur Überwachung der Produktion einer Strickmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8224194U1 (de) * 1981-08-31 1983-02-10 Tecan AG, 8634 Hombrechtikon Textilmaschine mit vorrichtung zur durchlaufmessung der faeden
GB2162971A (en) * 1984-08-08 1986-02-12 Gustav Memminger Textile machinery yarn supply apparatus
EP0305811A2 (fr) * 1987-09-02 1989-03-08 Gustav Memminger Dispositif pour surveiller la fourniture de fil d'un fournisseur de fil pour des machines textiles
EP1335054A2 (fr) * 2002-01-28 2003-08-13 L.G.L. Electronics S.p.A. Procédé et dispositif pour mesurer le fil de trame, en particulier dans les métiers à tricoter circulaires électroniques

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10112795A1 (de) * 2001-03-16 2002-09-26 Iro Ab Verfahren zur Produktionsüberwachungs/Einstellung einer Strickmaschine, und Produktionsüberwachungs/Einstellungs-Vorrichtung
DE10228794A1 (de) * 2002-06-27 2004-01-15 Iropa Ag Fadenverarbeitendes System und Verfahren zum Steuern und/oder Überwachen des Systems
DE10234545B4 (de) * 2002-07-30 2005-12-15 Memminger-Iro Gmbh Verfahren und Vorrichtung zum Liefern von Fäden

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8224194U1 (de) * 1981-08-31 1983-02-10 Tecan AG, 8634 Hombrechtikon Textilmaschine mit vorrichtung zur durchlaufmessung der faeden
GB2162971A (en) * 1984-08-08 1986-02-12 Gustav Memminger Textile machinery yarn supply apparatus
EP0305811A2 (fr) * 1987-09-02 1989-03-08 Gustav Memminger Dispositif pour surveiller la fourniture de fil d'un fournisseur de fil pour des machines textiles
EP1335054A2 (fr) * 2002-01-28 2003-08-13 L.G.L. Electronics S.p.A. Procédé et dispositif pour mesurer le fil de trame, en particulier dans les métiers à tricoter circulaires électroniques

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2857567A1 (fr) * 2013-10-02 2015-04-08 Memminger-IRO GmbH Procédé et dispositif de surveillance de la production d'une machine à tricoter

Also Published As

Publication number Publication date
EP1954861A1 (fr) 2008-08-13
CN101316958B (zh) 2011-04-20
TW200736150A (en) 2007-10-01
TWI334402B (en) 2010-12-11
DE502006008857D1 (de) 2011-03-17
DE102005057352B3 (de) 2007-08-23
EP1954861B1 (fr) 2011-02-02
CN101316958A (zh) 2008-12-03

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