EP0095709B1 - Garnzuführapparat für eine Ringelstrickmaschine - Google Patents

Garnzuführapparat für eine Ringelstrickmaschine Download PDF

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Publication number
EP0095709B1
EP0095709B1 EP83105136A EP83105136A EP0095709B1 EP 0095709 B1 EP0095709 B1 EP 0095709B1 EP 83105136 A EP83105136 A EP 83105136A EP 83105136 A EP83105136 A EP 83105136A EP 0095709 B1 EP0095709 B1 EP 0095709B1
Authority
EP
European Patent Office
Prior art keywords
yarn
feed
knitting machine
feeding device
circuit
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.)
Expired
Application number
EP83105136A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0095709A1 (de
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/de
Application granted granted Critical
Publication of EP0095709B1 publication Critical patent/EP0095709B1/de
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 present invention relates to a yarn feed apparatus according to the preamble of claim 1.
  • the yarn guide elements are moved by magnets in the non-feed areas, while their movement in the feed areas are brought about by increased yarn tensions resulting 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 brought about exclusively by the changes in tension in the yarn due to the working of the fingers of the ringing 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 sufficiently long in each case 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 the yarn guide element was able to move in addition to the normal trailing movement due to the yarn break.
  • 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 malfunction in the course of the yarn to the ringing mechanism and to the knitting needles or due to soiled eyelets or one wrong knitting machine setting.
  • 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. Shortly thereafter, the yarn tension increases again because the positive feed has ended, whereby 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 due to vibrations or begins to sag due to air currents. Such a fault is particularly difficult to find out if the contact function of the position sensor is not sufficiently sensitive and can cause the knitting machine to stand still for a considerable time.
  • Another yarn error is present when two yarns are processed simultaneously in the ringing 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 object of the present invention is to develop a generic yarn feed device in such a way that further yarn feed errors can be detected.
  • 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 2a for a vertical axis 3, on which four yarn feed wheels 4A, 4B, 4C and 4D are freely rotatably mounted, one above the other. Part of the circumference of each yarn feed wheel is from a belt 5A, 5B, 5C, 5D embraced.
  • the belts are driven in a known manner in accordance with the knitting machine, in this case to feed four yarns FA, FB, FC, FD 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 are 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.
  • the transition from the non-conductive part to the conductive part of each contact plate is arranged so that a signal is generated precisely when the associated yarn comes out of the engagement of the belt 5A, 5B, 5C, 5D or runs in under the belt, i.e.
  • the switching points of the position sensors are precisely in these border areas, in which a positive delivery of the yarn begins or ends.
  • the respective signal is then maintained unchanged when the yarn guiding element continues to move within the non-feed area or the feed area.
  • 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 voltage supply, also in the housing 1.
  • 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 a circuit as it is known from EP-A-0 028 412 and which can be used in the yarn feeder of Fig. 1 per se, where a timing element or a timing circuit TC with a possibly before the control relay CR Time delay of t o is provided.
  • 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 the possibly arranged timing element TC being closed.
  • the knitting machine works. In the event of a yarn break in the yarn FA or a drop in the yarn tension due to an external influence, the yarn guide element 6Aout swings upward while the feed yarn guiding element 6Ain swings down.
  • the contact pin 7A ' reaches 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 CRc 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 timer 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 o then bridges the short period of time during which no feed area signal occurs.
  • Another yarn error is when, for some reason, the old yarn being processed or a new yarn does not know properly from the knitting needles processed or has not been properly passed on to the knitting needles by the respective finger in the ringing mechanism.
  • 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 responds to this signal combination and actuates the switch-off relay, whereby the knitting machine is switched off suddenly.
  • this circuit does not respond if there is another yarn fault, namely 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 is to be switched off according to the invention.
  • the electronic switching unit provided in each case (indicated by dashed lines in FIG. 3A, in FIG. 4) detects a signal combination from the position sensors that indicates 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 connections of an electronic logic switching unit A, which, for. B. from conventional electronic logic components (as Fig. 4) or is formed by a microprocessor.
  • 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 switching 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 fault 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 more than one feed area signal is present at the same time as non-feed area signals represents this error condition.
  • the logic switching unit can be designed in such a way that it outputs 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 changing yarn. Because when changing yarns with an overlap, two yarns are fed simultaneously 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 gate NOR i , 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 via a connecting line to the switch-off relay of the knitting machine, an earthed indicator lamp L for visual indication of a fault condition being located in the connecting line.
  • 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 this error condition is deleted by actuating the switch SW 1 .
  • the two operational amplifiers OP 1 , OP 2 and / or also the NOR elements NOR, -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 switching 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 at the 1, a voltage level queue an input of the first operational amplifier OP, so that its output delivers a high voltage level or a voltage potential representing a as a signal corresponds to binary 1.
  • the signal finally passes through to the base of transistor T5, which makes this transistor conductive and sends a switch-off signal on the connecting line to the switch-off relay of the knitting machine, which is generated by the holding circuit NOR 3 and NOR 4 is maintained and the lamp L also lights up.
  • 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. Form signal combinations that exactly represent the presence of error conditions in which the knitting machine must be switched off. 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 is advantageous to choose whether the yarn fed in or the yarn not fed in is 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.
  • a positive signal e.g., a binary 1
  • 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 Garnzuführapparat für eine Ringelstrickmaschine Expired EP0095709B1 (de)

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
SE8205657 1982-10-04
SE8205657A SE8205657D0 (sv) 1982-10-04 1982-10-04 Stoppsignalsystem vid flerfergsfournissor, foretredesvis for ringel-stickmaskiner

Publications (2)

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

Family

ID=27355265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83105136A Expired EP0095709B1 (de) 1982-05-25 1983-05-24 Garnzuführapparat für eine Ringelstrickmaschine

Country Status (5)

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

Families Citing this family (7)

* 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
CN103469471B (zh) * 2013-09-10 2014-12-24 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
DE102014110647B4 (de) * 2014-07-29 2016-10-20 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Fadenzuführvorrichtung und Verfahren zum Zuführen von Fäden zu einer Rundstrickmaschine mit Ringelapparaten
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

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
DE1585298B1 (de) * 1963-11-22 1970-10-15 Rosen Karl I J Vorrichtung zum Ein- und Ausschalten der Fadenlieferung an einzelnen Systemen einer vielsystemigen Rundstrickmaschine
FR1575484A (ja) * 1966-08-12 1969-07-18
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
NL7414045A (nl) * 1973-12-18 1975-06-20 Chomarat & Cie Werkwijze en inrichting voor het voeden van een textielmachine, zoals een rondbreimachine, met een draad onder constante spanning.
DE2421749C2 (de) * 1974-05-06 1984-01-05 Výzkumný a vývojový ústav závodu všeobecného strojírenství, Brno Schaltanordnung zum Abschalten einer Strickmaschine bei Garnbruch
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.
US4271687A (en) * 1978-08-01 1981-06-09 Memminger Gmbh Rapid maintenance thread or yarn supply apparatus, particularly for circular knitting machines
DE2836716C2 (de) * 1978-08-22 1980-04-30 Ab Iro, Ulricehamn (Schweden) Positive Fadenliefervorrichtung für Ringelvorrichtungen
DE3063174D1 (en) * 1979-10-31 1983-06-16 Iro Ab Apparatus for selective positive feeding of a plurality of yarns to a striping knitting machine

Also Published As

Publication number Publication date
EP0095709A1 (de) 1983-12-07
DE3377801D1 (en) 1988-09-29
JPH0333826B2 (ja) 1991-05-20
US4607507A (en) 1986-08-26
JPS59501673A (ja) 1984-10-04
WO1983004273A1 (en) 1983-12-08

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