EP0095709A1 - Fournisseur de fil pour un métier à tricoter avec rayeur - Google Patents

Fournisseur de fil pour un métier à tricoter avec rayeur Download PDF

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Publication number
EP0095709A1
EP0095709A1 EP83105136A EP83105136A EP0095709A1 EP 0095709 A1 EP0095709 A1 EP 0095709A1 EP 83105136 A EP83105136 A EP 83105136A EP 83105136 A EP83105136 A EP 83105136A EP 0095709 A1 EP0095709 A1 EP 0095709A1
Authority
EP
European Patent Office
Prior art keywords
yarn
feed area
signal
knitting machine
switching unit
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
Application number
EP83105136A
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German (de)
English (en)
Other versions
EP0095709B1 (fr
Inventor
Kurt A. G. Jacobsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Iro AB
Original Assignee
Iro AB
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
Priority claimed from SE8205657A external-priority patent/SE8205657D0/xx
Application filed by Iro AB filed Critical Iro AB
Publication of EP0095709A1 publication Critical patent/EP0095709A1/fr
Application granted granted Critical
Publication of EP0095709B1 publication Critical patent/EP0095709B1/fr
Expired legal-status Critical Current

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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
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/10—Indicating, warning, or safety devices, e.g. stop motions
    • D04B35/12—Indicating, warning, or safety devices, e.g. stop motions responsive to thread consumption

Definitions

  • the invention relates to a yarn feed apparatus according to the preamble of patent claim 1.
  • yarn guide elements are adjusted by magnets in the non-feed areas, while their adjustment movement in the feed areas are brought about by increased yarn tensions which result from the work of the fingers in the ringing mechanism.
  • yarn feeders are also known in which the movement of the yarn guide elements is caused solely by the changes in tension in the yarn due to the working of the fingers of the stripping mechanism.
  • Each yarn transport element is a constantly driven belt that runs over a freely rotatable roller. As soon as the yarn guide element moves the yarn under the belt, it takes the yarn with it and conveys it to the associated finger. Conversely, when the yarn guide element moves into the non-feed area, the yarn is moved out from under the belt and remains there.
  • the path of movement of the guide element is in each case sufficiently long so that the yarn guide element compensates for an inevitable wobble movement of the yarn which results from the inertia of the yarn mass and the yarn elasticity when the previously effective acceleration by the yarn transport element is suddenly dismantled.
  • the position sensor connected to the yarn guide element indicates a yarn break with a signal in an end position of the yarn guide element in the non-feed area, which end position the yarn guide element can only reach if, in addition to the normal trailing movement as a result of the yarn breakage, the yarn guide element was able to move on.
  • the knitting machine is switched off with this signal. In all other positions in the non-feed area and in the feed area, the position sensor emits no signal.
  • the disadvantage here is that no signal can be generated with the position sensor if a yarn error occurs in which the knitting machine does not consume the amount of yarn supplied properly, for example as a result of a disturbance in the course of the yarn to the ring mechanism and to the knitting needles or because of dirty yarn eyelets or an incorrect knitting machine -Attitude.
  • the tension in the yarn running out of the yarn feed apparatus is reduced, as a result of which the guide element moves the yarn out of the feed area without, however, reaching its end position.
  • the yarn tension rises again because the positive feed has ended, as a result of which the yarn guide element moves the yarn back into the feed area.
  • the position sensor does not react to this yarn error, conversely the guide element can reach its end position, in which a switch-off signal is initiated via the position sensor if the tension in the incoming yarn slowly decreases if this yarn has not been processed for a long time and as a result of vibrations or begins to sag due to air currents.
  • a switch-off signal is initiated via the position sensor if the tension in the incoming yarn slowly decreases if this yarn has not been processed for a long time and as a result of vibrations or begins to sag due to air currents.
  • Such an error is difficult to find out, especially if the contact function of the position sensor is not particularly sensitive and can result in a considerable downtime for the knitting machine.
  • Another thread error exists when two strands are processed simultaneously in the streak mechanism after a color change. This yarn error is also not indicated by the position sensor since it does not reach its end position.
  • the invention has for its object to provide a yarn feeder of the type mentioned, which reliably and quickly turns off the knitting machine in the event of actual and serious yarn defects.
  • each yarn guide element already generates a signal when the yarn comes into engagement with the transport element or out of the engagement of the transport element, and not only in an end position.
  • the signals emitted by all position sensors and processed in the logical switching unit form different signal combinations in the different operating states, from which the logical switching unit can determine whether there is an error condition due to which the knitting machine must be switched off or not.
  • the processing of the signals and the evaluation of the signal combinations take into account the knowledge that with proper work and no yarn breakage or yarn error, only a single yarn may be processed, which must then be fed positively, so that more than one positively fed yarn and also no positive at all fed yarn can only mean a yarn error.
  • the logical switching unit can take this basic requirement into account very simply when processing the signals, and when this combination of signals occurs there is certainty that a yarn breakage has occurred or the fingers in the ringing mechanism must work incorrectly.
  • the knitting machine must therefore not be switched on if there is a logical condition in which it is indicated that one and only this is a yarn in the feed area.
  • the yarn feeder according to the invention works particularly reliably, i.e. the signals are generated very precisely.
  • the voltage level reflects the respective signal combination very precisely, e.g. in the form of a step-like course, the signals from the position sensor consisting, for example, of a binary 0 and a binary 1, the binary 1 being expediently generated by the position sensor when the associated thread guide element is in the non-feed area.
  • the reference voltages being adjustable and possibly adjustable to the respective circumstances.
  • This holding circuit is intended to prevent the knitting machine from possibly starting up again automatically before the detected error is eliminated.
  • a yarn feeder has a housing 1 which is attached to a fastening section 2 with which the yarn feeder can be fixed to a circular support ring 2 'in a horizontal ring knitting machine above an associated knitting station.
  • the fastening section 2 extends partly in and partly below the housing 1 and forms a support plate te 2a for a vertical axis 3, on which four yarn feed wheels 4A, 4B, 4C and 4D are freely rotatable, one above the other. A part of the circumference of each yarn feed wheel is encompassed by a belt. 5A, 5B, 5C, 5D.
  • the belts are driven in a known manner in accordance with the knitting machine in order to feed four yarns FA, FB, FC, FD in this case, which come from yarn spools, not shown.
  • the yarns are then fed, preferably via guide eyes, to the fingers in a ringing mechanism (not shown), from which they then run to the knitting needles in the knitting machine.
  • yarn guide elements 6Ain, 6Bin, 6Cin, 6Din and 6Aout, 6Bout, 6Cout, 6Dout are each pivotably mounted in pairs, with an inlet guide element 6Ain, 6Bin, 6Cin, 6Din for each yarn FA, FB, FC, FD and a drain feed element 6Aout, 6Bout, 6Cout, 6Dout, which is firmly connected thereto, is provided.
  • Each feed guide element 6Ain, 6Bin, 6Cin, 6Din can be pivoted back and forth between a feed area and a non-feed area against the force of a spring, not shown, which acts counterclockwise, as can the drain guide elements 6Aout, 6Bout, 6Cout, 6Dout.
  • a spring not shown, which acts counterclockwise, as can the drain guide elements 6Aout, 6Bout, 6Cout, 6Dout.
  • the inlet guide element 6Ain and the outlet guide element 6Aout is in the feed area position, so that the yarn FA is fed positively while the other yarn guide elements are in their non-feed area positions so that the other yarns FB, FC, FD are not fed.
  • the yarn guide elements are mounted in the housing 1 with shafts 8 lying perpendicular to the plane of the drawing (FIG. 1).
  • a contact pin 7A ', 7B', 7C ', 7D' is connected to each shaft and, together with a correspondingly arranged contact plate 7A ", 7B", 7C ", 7D", forms an electrical position sensor for the respective position of the associated yarn guide element.
  • the contact plates 7A ", 7B", 7C '', 7D are only conductive in the left part, while they are non-conductive in the right part.
  • the position sensor emits a signal when the associated yarn guide element is in the feed area position, while no signal is generated in the non-feed area position.
  • This arrangement could of course also be the other way round.
  • the transition from the non-conductive part to the conductive part of each contact plate is arranged in such a way that a signal is generated exactly when the associated one Yarn from the engagement of the belt 5A, 5B, 5C, 5D arrives or runs in under the belt, ie the switching points of the position sensors are precisely in these border areas in which a positive delivery of the yarn begins or stops.
  • the respective signal then remains maintain the further movement of the yarn guide element within the non-feed area or the feed area unchanged.
  • the contact plates 7A “, 7B", 7C “, 7D” are connected via a connecting line to a control relay CR, which on the other hand is connected to a positive voltage supply in the housing 1.
  • the contact pins 7A ', 7B', 7C ', 7D' are connected via a common line to a negative one Power supply, also in housing 1, connected.
  • the control relay CR has its relay contacts CR c in a circuit which is routed via the switch-off relay of the knitting machine. This switch-off relay switches off the knitting machine, for example, when it is energized.
  • This circuit in the housing forms an electrical logic switching unit which works in the aforementioned manner and then switches off the knitting machine when certain signal combinations are generated by all position sensors, which will be explained later.
  • FIG. 2 shows the circuit that can be used in the yarn feeder of FIG. 1, wherein a timing element or a timing circuit TC with a time delay of t 0 may be provided before the control relay CR.
  • the position of the contact pins or the shafts 8A, 8B, 8C, 8D of the yarn guide elements corresponds to that shown in FIG. 1.
  • the yarn FA is fed positively.
  • the associated contact pin 7A ' closes the contact with the contact plate 7A ", the direct current circuit from (-) (+) via the control relay CR and possibly arranged timing element TC being closed.
  • this means that the control relay CR is tightened and keeps the contacts CR open so that the circuit for the switch-off relay of the knitting machine is open.
  • the knitting machine is operating.
  • the yarn guide element 6Aout swings upward, while the feed yarn guide element 6Ain swings down.
  • the contact pin 7A enters the non-conductive area of the contact plate 7A ", so that the direct current circuit via the control relay CR is interrupted and the control relay CR drops out.
  • the contacts CR of the control relay CR close the circuit for the switch-off relay of the knitting machine, so that the knitting machine is switched off immediately.
  • the timing element TC (FIG. 2) can be provided in the event that there is no overlap between the old and the new yarn in the knitting machine during a yarn change. This timer with its time t 0 then bridges the short period of time during which no feed area signal occurs.
  • a further yarn fault is present if for some reason the old yarn or a new yarn just processed is not properly processed by the knitting needles or not properly processed by the knitting needles or is not properly passed on to the knitting needles by the respective finger in the ringing mechanism has been.
  • the position sensor for this yarn will generate a non-feed area signal as a result of the yarn tension reduction occurring with this yarn error, or a feed area signal will then no longer be generated by any position sensor of all the position sensors provided.
  • the logical switching unit speaks to this signal combination nation on and actuates the switch-off relay, whereby the knitting machine is switched off suddenly.
  • Another yarn fault is present if, after changing the yarn, the old yarn, which may no longer be processed, remains tensioned because e.g. , has not been cut correctly in the striping mechanism or in front of the knitting needle. The old yarn is then also processed with the new yarn, i.e. both yarns are fed positively.
  • the knitting machine should also be switched off in this case. 3 and 4 in that the electronic switching unit provided (in FIG. 3: A, indicated by dashed lines in FIG. 4) detects a signal combination from the position sensors indicating this yarn error condition and then switches off the knitting machine .
  • the contact plates 7A “, 7B", 7C “, 7D” are connected to a number of input terminals of an electronic logic switching unit A, which is manufactured, for example, from conventional electronic logic components (such as FIG. 4) or is formed by a microprocessor becomes.
  • the output of the logic switching unit A is connected to the coil of a control relay CR A , the relay contacts of which lie in a circuit of the switch-off relay of the knitting machine.
  • the electronic logic switch unit A is designed so that it generates an output signal for switching the control relay CR A under two fault conditions represented by certain signal combinations, in which the switch-off relay of the knitting machine is actuated.
  • the first error condition consists of n non-feed area signals from the position sensors 7A ', 7A ", 7B', 7B", 7C ', 7C ", 7D', 7D", where n is the number of position sensors. This signal combination of n signals indicates that no yarn is being knitted or that the yarn intended for knitting is broken.
  • the second error condition is indicated by a signal combination consisting of (n minus a number greater than 1) signals, where n is the number of position sensors available.
  • a signal combination in which there is more than one feed area signal simultaneously with non-feed area signals represents this error condition, in which case e.g. two yarns are knitted at the same time.
  • the logic switch unit can be designed to provide an output signal for the switch-off relay of the knitting machine with a certain time delay, e.g. 20 milliseconds to prevent the knitting machine from being switched off incorrectly when the yarn is changed. Because when changing yarns with an overlap, two yarns are fed positively for a short time, while when changing yarns without overlap, a certain amount of time is not fed at all, because the old yarn is no longer fed and the new yarn is not yet fed.
  • a certain time delay e.g. 20 milliseconds
  • the position sensors are formed by four phototransistors T1 to T4 and four photodiodes D1 to D4 as opto-electronic position sensors for the yarn guide elements.
  • the emitters of the phototransistors T1 to T4 are connected via a resistor network NET r to an input of a first operational amplifier OP 1 and to an input of a second operational amplifier OP 2 .
  • the other, negative input of the first operational amplifier OP 1 is supplied with a reference voltage value.
  • the other and positive input of the second operational amplifier OP 2 is also connected to a reference voltage.
  • the output of the first operational amplifier OP 1 is connected to an input of a first NOR gate NOR 1 .
  • the output of the second operational amplifier OP 2 is connected via an intermediate resistor and a first timing circuit RC 1 to the second input of the first NOR element NOR 1 , the timing circuit RC 1 having a time constant of approximately 140 milliseconds, for example.
  • the output of the first NOR gate NOR 1 is applied to both inputs of a second NOR gate NOR 2 , the output of which is connected to a hold circuit via a second timing circuit RC 2 .
  • the timer circuit RC 2 has a time constant of approximately 60 milliseconds, for example.
  • the hold circuit consists of two NOR gates NOR 3 and NOR 4 , the output of the NOR gate NOR 2 being connected via an intermediate resistor to one input of the NOR gate NOR 3 of the hold circuit.
  • the other input of the NOR gate NOR 3 is connected via a feedback loop to the output of the NOR gate NOR 4 of the hold circuit.
  • the output of the NOR gate NOR 3 is connected to one input of the NOR gate NOR 4 , while the other input of the NOR gate NOR 4 is connected to a contact of a reset switch SW 1 via a resistor and a capacitor.
  • the output of the holding circuit is connected to the base of a further transistor T5, which is connected to the switch-off relay of the knitting machine via a connecting line, an earthed indicator lamp L being located in the connecting line for visually indicating an error condition.
  • the holding circuit NOR 3 and NOR 4 keeps the switch-off relay of the knitting machine open after the occurrence of an error condition until the error condition is cleared by actuating the switch SW 1 .
  • the two operational amplifiers OP 1 , OP 2 and / or also the NOR gates NOR 1 - NOR 4 can expediently each be contained in an integrated circuit of conventional design, which simplifies the manufacture of the circuit and keeps the space for accommodating the circuit small.
  • a switch SW 2 is arranged between the position sensors and the two operational amplifiers OP 1 and OP 2 via intermediate resistors, with which the position sensors can be bridged under certain operating conditions.
  • a diode is used in the connecting line between the switch SW 2 and the second operational amplifier OP 2 .
  • This electronic logic switch unit according to FIG. 4 is attached to the inside of the housing 1 of the yarn feed apparatus according to FIG. 1, as indicated in FIG. 1.
  • all four transistors T1 to T4 become conductive.
  • the first operational amplifier OP 1 superior resistors R 1 and R 2 is the resistance network NET R to one input of the first operational amplifier OP 1, a voltage level are pending, so that its output delivers a high voltage level or a voltage potential, which as a signal of a corresponds to binary 1.
  • the base of the transistor T5 receives a voltage potential, as a result of which the transistor T5 becomes conductive and generates a switch-off signal.
  • the invention is not intended to be limited to the exemplary embodiments explained above. These exemplary embodiments are only intended to provide an understanding of the idea according to the invention of generating a signal from the yarn movement between the feed area and the non-feed area exactly in the transition area from the positive feed to no feed and together with the signals which depend on the positions of the other yarns. To form signal combinations that exactly represent the presence of error conditions in which the knitting machine has to be removed. It is of secondary importance how the knitting machine is ultimately switched off. Depending on how the signals are evaluated by the bearing sensors, it can advantageously be selected whether the respectively fed yarn or the yarns not being fed are monitored, i.e. each feed area signal will then be a positive signal (e.g. a binary 1), while the non-feed area signals will be negative signals (e.g. binary 0) or vice versa. The preference is to give a check of the yarns that have not just been fed, for several reasons.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP83105136A 1982-05-25 1983-05-24 Fournisseur de fil pour un métier à tricoter avec rayeur Expired EP0095709B1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
SE8203216 1982-05-25
SE8203216 1982-05-25
SE8204685 1982-08-13
SE8204685 1982-08-13
SE8205657A SE8205657D0 (sv) 1982-10-04 1982-10-04 Stoppsignalsystem vid flerfergsfournissor, foretredesvis for ringel-stickmaskiner
SE8205657 1982-10-04

Publications (2)

Publication Number Publication Date
EP0095709A1 true EP0095709A1 (fr) 1983-12-07
EP0095709B1 EP0095709B1 (fr) 1988-08-24

Family

ID=27355265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83105136A Expired EP0095709B1 (fr) 1982-05-25 1983-05-24 Fournisseur de fil pour un métier à tricoter avec rayeur

Country Status (5)

Country Link
US (1) US4607507A (fr)
EP (1) EP0095709B1 (fr)
JP (1) JPS59501673A (fr)
DE (1) DE3377801D1 (fr)
WO (1) WO1983004273A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103469471A (zh) * 2013-09-10 2013-12-25 江苏金龙科技股份有限公司 纱线张力调整装置的断纱信号触发机构
EP2980291A3 (fr) * 2014-07-29 2016-07-27 SIPRA Patententwicklungs- und Beteiligungsgesellschaft mbH Dispositif d'alimentation en fil

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1178552B (it) * 1984-10-03 1987-09-09 Savio Spa Dispositivo perfezionato per il rilevamento della mancanza del filo di alimentazione degli aghi nelle macchine circolari per calzetteria
IT1217872B (it) * 1988-06-20 1990-03-30 Mario Scavino Dispositivo guida filo a leva azionato da motore lineare per macchine tessili
DE3909817C2 (de) * 1989-03-24 1998-05-20 Sipra Patent Beteiligung Einrichtung zum Ein- und Ausschalten wenigstens eines Funktionsteils einer Strickmaschine
CN103161018A (zh) * 2011-12-09 2013-06-19 佰龙机械厂股份有限公司 圆型针织机送纱系统
CN113493956B (zh) * 2021-07-09 2022-12-20 绍兴百善家纺有限公司 一种纺织圆机单双线可用式喂纱嘴

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE655976A (fr) * 1963-11-22 1965-03-16
FR1575484A (fr) * 1966-08-12 1969-07-18
DE2459954A1 (de) * 1973-12-18 1975-06-19 Chomarat & Cie Verfahren und vorrichtung zum zufuehren eines fadens mit einer konstanten spannung zu einer textilmaschine
DE2421749A1 (de) * 1974-05-06 1975-11-20 Vyzk Vyvojovy Ustav Vseobe Schaltanordnung zum abschalten einer strickmaschine
EP0028412A1 (fr) * 1979-10-31 1981-05-13 Aktiebolaget Iro Appareil pour l'alimentation sélective et positive de plusieurs fils sur un métier à tricoter des rayures
US4271687A (en) * 1978-08-01 1981-06-09 Memminger Gmbh Rapid maintenance thread or yarn supply apparatus, particularly for circular knitting machines

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
DE2156614A1 (de) * 1971-11-15 1973-05-24 Meissner & Eckrath Kg Fadenueberwachungsvorrichtung fuer textilmaschinen
SU425845A1 (ru) * 1972-04-10 1974-04-30 Г. К. Соколов, С. Л. Буслович, Р. П. Турла, А. Я. Димбирс , П. П. Коковкин Фотоэлектрическое устройство дляопределения обрыва нитевидногоматериала
US3950966A (en) * 1975-05-12 1976-04-20 Scorpio Industries Inc. Demand responsive positive feed device for knitting machine
CH629456A5 (de) * 1978-06-19 1982-04-30 Loepfe Ag Geb Elektronische einrichtung zur ueberwachung einer mehrzahl laufender faeden an einer textilmaschine.
DE2836716C2 (de) * 1978-08-22 1980-04-30 Ab Iro, Ulricehamn (Schweden) Positive Fadenliefervorrichtung für Ringelvorrichtungen

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE655976A (fr) * 1963-11-22 1965-03-16
FR1575484A (fr) * 1966-08-12 1969-07-18
DE2459954A1 (de) * 1973-12-18 1975-06-19 Chomarat & Cie Verfahren und vorrichtung zum zufuehren eines fadens mit einer konstanten spannung zu einer textilmaschine
DE2421749A1 (de) * 1974-05-06 1975-11-20 Vyzk Vyvojovy Ustav Vseobe Schaltanordnung zum abschalten einer strickmaschine
US4271687A (en) * 1978-08-01 1981-06-09 Memminger Gmbh Rapid maintenance thread or yarn supply apparatus, particularly for circular knitting machines
EP0028412A1 (fr) * 1979-10-31 1981-05-13 Aktiebolaget Iro Appareil pour l'alimentation sélective et positive de plusieurs fils sur un métier à tricoter des rayures

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103469471A (zh) * 2013-09-10 2013-12-25 江苏金龙科技股份有限公司 纱线张力调整装置的断纱信号触发机构
EP2980291A3 (fr) * 2014-07-29 2016-07-27 SIPRA Patententwicklungs- und Beteiligungsgesellschaft mbH Dispositif d'alimentation en fil

Also Published As

Publication number Publication date
US4607507A (en) 1986-08-26
EP0095709B1 (fr) 1988-08-24
WO1983004273A1 (fr) 1983-12-08
DE3377801D1 (en) 1988-09-29
JPS59501673A (ja) 1984-10-04
JPH0333826B2 (fr) 1991-05-20

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