EP2363519B1 - Dispositif de préhension de fil et de découpe, particulièrement pour doigts de fils à bandes pour machines à tricoter ou similaire - Google Patents

Dispositif de préhension de fil et de découpe, particulièrement pour doigts de fils à bandes pour machines à tricoter ou similaire Download PDF

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Publication number
EP2363519B1
EP2363519B1 EP11154804.6A EP11154804A EP2363519B1 EP 2363519 B1 EP2363519 B1 EP 2363519B1 EP 11154804 A EP11154804 A EP 11154804A EP 2363519 B1 EP2363519 B1 EP 2363519B1
Authority
EP
European Patent Office
Prior art keywords
yarn
gripping
holding element
cutting
holding
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.)
Not-in-force
Application number
EP11154804.6A
Other languages
German (de)
English (en)
Other versions
EP2363519A1 (fr
Inventor
Ettore Lonati
Fausto Lonati
Tiberio Lonati
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.)
Santoni SpA
Original Assignee
Santoni SpA
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 Santoni SpA filed Critical Santoni SpA
Publication of EP2363519A1 publication Critical patent/EP2363519A1/fr
Application granted granted Critical
Publication of EP2363519B1 publication Critical patent/EP2363519B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D04B15/54—Thread guides
    • D04B15/58—Thread guides for circular knitting machines; Thread-changing devices
    • D04B15/60—Thread guides for circular knitting machines; Thread-changing devices with thread-clamping or -severing devices
    • 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
    • D04B15/54—Thread guides
    • D04B15/58—Thread guides for circular knitting machines; Thread-changing devices

Definitions

  • the present invention relates to a yarn gripping and cutting device, particularly for striping yarn fingers for knitting machines or the like.
  • yarn fingers are known which are called “striping fingers” and are used generally in assemblies, which, being equipped for each yarn finger with an adapted yarn gripping and cutting device, allow, during production, to change the yarn supplied to the needles at a feed or drop of the machine.
  • Yarn gripping and cutting devices comprise generally a holding element, which has a laminar body in which a recess is defined, on one side, which is adapted to receive the yarn to be gripped and cut.
  • the holding element is interposed between a gripping element and a cutting element, which also have a laminar body, which face the two opposite sides of the holding element.
  • the gripping element and the holding element are elastically loaded toward each other on their mutually facing sides.
  • the holding element can move with respect to the cutting element and the gripping element along an actuation direction in order to pass from a yarn standby position, in which the portion of the holding element having the cited recess protrudes from the front side of the gripping element and of the cutting element, to a retention position, in which the portion of the holding element with the recess is retracted between the gripping element and the cutting element.
  • the recess In the standby position, the recess is in a suitable position to receive the yarn to be gripped and cut, which is designed to straddle the recess transversely to the actuation direction of the holding element in relation to the gripping element and the cutting element.
  • the holding element retracts progressively between the gripping element and the cutting element.
  • the yarn, engaged by the holding element is progressively dragged between the side of the holding element and the side of the gripping element, thus actuating its retention and, immediately thereafter, the yarn is brought into contact with the front side, which constitutes the blade, of the cutting element, actuating its cutting.
  • These yarn gripping and cutting devices generally have good reliability in gripping of the yarn, and such reliability derives mainly from the elastic load between the holding element and the gripping element.
  • Such elastic load which is needed in order to ensure the correct gripping of the yarn, may cause excessive stresses of the yarn, which may cause the fraying or even the breakage of the yarn during its grip when the yarn is dragged, by the movement of the holding element, between the side of the holding element and the side of the gripping element.
  • Breakage of the yarn is not a minor problem, because it causes the loss of the yarn on the part of the respective yarn finger and requires a stop of the machine and the manual intervention of an operator in order to restore the correct feeding of the yarn to the machine.
  • Such problem in practice precludes the use of particularly delicate yarns on knitting machines that use such yarn gripping and cutting devices.
  • the aim of the present invention is to solve the problems described above, by providing a yarn gripping and cutting device, particularly for striping yarn fingers for knitting machines or the like, which effectively avoids overstraining the yarn during its gripping.
  • an object of the invention is to provide a yarn gripping and cutting device that makes it possible to use particularly delicate yarns even on machines that use striping yarn finger assemblies of the type described above.
  • Another object of the invention is to provide a device that can be derived, in an extremely simple manner, from yarn gripping and cutting devices of the known type.
  • a further object of the invention is to provide a device that can be installed, without problems, on knitting machines as a replacement of the yarn gripping and cutting devices that equip currently commercially available striping yarn finger assemblies.
  • a yarn gripping and cutting device particularly for striping yarn fingers for knitting machines or the like, comprising an element for holding the yarn which has a laminar body having, on one of its sides, a recess adapted to receive the yarn to be gripped and cut; laterally to said holding element, on mutually opposite sides, being respectively provided a gripping element and a cutting element; said holding element and said gripping element being pushed elastically toward each other on their mutually facing sides; said holding element being movable with respect to said gripping element and to said cutting element along an actuation direction from a standby position, in which said recess is arranged at least partially outside the space occupation of said gripping element and of said cutting element in order to receive the yarn to be gripped and cut, which straddles said recess transversely to said actuation direction, to a retention position, in which said recess is retracted between said gripping element and said cutting element to perform, in succession, the retention
  • the device according to the invention comprises an element 2 for holding a yarn 3, a gripping element 4 and a cutting element 5.
  • the holding element 2 has a laminar body which has, on one of its sides, a recess 6 adapted to receive the yarn 3 to be gripped and cut.
  • the gripping element 4 which also has a laminar body, is arranged laterally to the holding element 2 and faces, with one of its sides, one side of the holding element 2.
  • the holding element 2 and the gripping element 4 are pushed elastically toward each other on their sides that face each other by means of springs or by using the elastic flexibility of the laminar body of the holding element 2 and/or of the gripping element 4.
  • the cutting element 5 which also preferably has a laminar body, faces with one of its sides the side of the holding element 2 that is opposite with respect to the side that the gripping element 4 faces.
  • the holding element 2 can move with respect to the gripping element 4 and the cutting element 5 along an actuation direction, indicated by the arrow 7, in order to pass from a standby position of the yarn 3 to a retention position of said yarn 3.
  • the holding element 2 is arranged with the recess 6 at least partially outside the space occupation of the gripping element 4 and of the cutting element 5, in a position that is suitable to receive the yarn 3 to be gripped and cut, which is designed to straddle the recess 6 transversely to the actuation direction 7. More clearly, in the standby position, the holding element 2 protrudes, with its recess 6, from the front side of the gripping element 4 and of the cutting element 5.
  • front side designates the side of the holding element 2, of the gripping element 4 and of the cutting element 5 that is designed to be directed toward the bed of the machine on which the device according to the invention has to be mounted, i.e., the side of the holding element 2, of the gripping element 4 and of the cutting element 5 that is designed to be directed toward the needles that must be fed by way of the yarn finger assembly that is equipped with the device according to the invention for each one of its yarn fingers.
  • the figures of the accompanying drawings show, besides the device 1, also a yarn finger 8 which is served by the device 1, and Figures 1 , 2 , 3 , 4 , 5 also illustrate an assembly of needles 9 of the machine to be fed by way of the yarn finger 8 and an assembly of sinkers 10.
  • the holding element 2 In the retention position, illustrated in Figures 1 and 5 , the holding element 2 is arranged with the recess 6 retracted between the gripping element 4 and the cutting element 5.
  • the movement of the holding element 2 from the standby position to the retention position causes, in succession, the retention of a portion of yarn 3, by way of its traction between the mutually facing sides of the holding element 2 and of the gripping element 4, and the cutting of the yarn 3, as a consequence of the interference of said yarn 3 against the front side 5a of the cutting element 5, which constitutes the blade of said cutting element 5.
  • the side of the recess 6 that lies opposite the front side 5a of the cutting element 5 acts as a contrast cutter.
  • the device 1 comprises spacing means 11, which are interposed between the holding element 2 and the gripping element 4 in order to limit the extent of the stresses on the yarn 3 during its traction between the holding element 2 and the gripping element 4.
  • the spacing means 11 can be disengaged from the holding element 2 and/or from the gripping element 4 just before the cutting of the yarn 3 by the cutting element 5 so as to ensure effective gripping of the yarn 3, between the holding element 2 and the gripping element 4, before its cutting.
  • the spacing means 11 cited above are constituted by a protrusion 12 that protrudes from the side of the gripping element 4 that faces the holding element 2.
  • the protrusion 12 instead of being arranged on one side of the gripping element 4, might be arranged on one side of the holding element 2, or there might be two protrusions, one on the holding element 2 and one on the gripping element 4, on their mutually facing sides, which mate with each other.
  • the holding element 2 has a portion 2a that can engage the protrusion 12 in its stroke for transition from the standby position to the retention position with the exception of the end portion of said stroke, because the holding element 2 has, in its region that faces the protrusion 12 when said holding element 2 is in the retention position, a hollow 13, which delimits the portion 2a at the front.
  • the holding element 2 disengages from the protrusion 12 just before the interference of the cutting element 5 with the yarn 3 arranged in the recess 6 of the holding element 2.
  • the protrusion 12 is constituted by a punch mark that protrudes from the side of the gripping element 4 that is directed toward the holding element 2.
  • the device according to the invention is designed to be used in particular with assemblies of yarn fingers 8 to be mounted on knitting machines, particularly circular knitting machines.
  • the assembly of striping yarn fingers 8 is arranged between the rotation axis of the needle cylinder of the machine and the ideal cylindrical surface along which the needles of the machine are arranged.
  • Each one of the yarn fingers 8, one of which is shown in Figures 1 to 5 is provided with a passage 14 for the yarn 3 and is served by a related device 1 according to the invention, which is arranged so that the actuation direction 7 is oriented radially in relation to the needle cylinder and substantially horizontally.
  • Each yarn finger 8 can move parallel to the actuation direction 7 in order to pass from a standby position, in which its passage 14 is in a rearward position with respect to the bed, i.e., with respect to the needles 9 of the machine, to a working position, in which its passage 14 is in a forward position toward the bed , i.e., toward the needles 9 of the machine and vice versa.
  • the yarn finger 8 In the transition from the standby position to the working position, the yarn finger 8 also moves along a direction which is perpendicular to the actuation direction 7, i.e., parallel to the needle cylinder axis if the machine is a circular knitting machine, so as to pass over the needles 9, as better described in EPA 07802212.6.
  • the yarn finger 8 is brought to the working position so as to arrange the portion of yarn 3, which extends from the passage 14 to the device 1, so that it straddles the bed of the machine, i.e., so as to intersect the imaginary cylindrical surface along which the needles 9 of the machine are arranged. In this manner there is the certainty that the needles 9 of the machine, moved to work at the feed or drop, served by the assembly of yarn fingers 8 being considered, grip the yarn 3 fed by the yarn finger 8.
  • the holding element 2 previously brought to the retention position, is moved, by way of its own movement along the actuation direction 7, in the standby position, as shown in Figure 2 .
  • the holding element 2 has the recess 6 extracted frontally to the gripping element 4 and to the cutting element 5 in a suitable position to receive the portion of yarn 3 that extends from the passage 14 of the yarn finger 8 up to the last needle 9, which has taken the yarn 3 at the feed or drop being considered, when the feeding of the yarn 3 will be interrupted to the needles 9 of the machine.
  • the yarn finger 8 In order to interrupt the feeding of the yarn 3 to the needles 9 of the machine, the yarn finger 8 is moved backwards in the standby position. This retraction places the portion of the yarn 3 that extends from the passage 14 to the needles 9 of the machine inside the recess 6, as shown in Figures 3 and 3 a.
  • the holding element 2 is moved from the standby position to the retention position.
  • the portion 2a of the holding element 2 is disengaged from the protrusion 12 and thus the gripping element 4 moves closer almost instantly to the holding element 2, safely gripping the yarn 3 between the gripping element 4 and the holding element 2, as shown in Figures 5 and 5a .
  • the holding element 2 When, during a subsequent feeding of the same yarn 3, the holding element 2 is moved from the retention position to the standby position, the portion 2a of the holding element 2 engages again the protrusion 12, spacing the gripping element 4 from the holding element 2 and thus ensuring the release of the yarn 3.
  • the device according to the invention fully achieves the intended aim, since it avoids effectively any excessive stressing of the yarn, while ensuring an efficient gripping of the yarn, making it possible to use even particularly delicate yarns on machines that use assemblies of yarn fingers that require yarn gripping and cutting devices.
  • Another advantage of the device according to the invention is that it can be obtained, with modifications that are simple to provide, from yarn gripping and cutting devices of the traditional type.
  • the device according to the invention has been conceived particularly for striping yarn fingers, it might be used with other types of yarn finger without thereby abandoning the scope of protection of the invention.
  • the materials used, as well as the dimensions, may be any according to requirements and to the state of the art.

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

Claims (7)

  1. Dispositif de saisie et de découpe de fil, en particulier pour devêtir des doigts de fil pour des machines à tricoter ou analogue, comprenant un élément (2) pour maintenir le fil (3) qui a un corps lamellaire ayant, sur l'un de ses côtés, un évidement (6) adapté pour recevoir le fil (3) à saisir et à découper ; latéralement par rapport audit élément de maintien (2), sur des côtés mutuellement opposés, étant respectivement fournis un élément de saisie (4) et un élément de découpe (5) ; ledit élément de maintien (2) et ledit élément de saisie (4) étant poussés élastiquement l'un vers l'autre sur leurs côtés mutuellement en regard ; ledit élément de maintien (2) étant mobile par rapport audit élément de saisie (4) et audit élément de découpe (5) le long d'une direction d'actionnement (7) à partir d'une position d'attente, dans laquelle ledit évidement (6) est agencé au moins partiellement à l'extérieur de l'occupation d'espace dudit élément de saisie (4) et dudit élément de découpe (5) afin de recevoir le fil (3) à saisir et à découper, qui chevauche ledit évidement (6) transversalement à ladite direction d'actionnement (7), jusqu'à une position de retenue, dans laquelle ledit évidement (6) est rétracté entre ledit élément de saisie (4) et ledit élément de découpe (5) pour réaliser, successivement, la retenue d'une partie du fil (3), au moyen de sa traction entre les côtés mutuellement en regard dudit élément de maintien (2) et dudit élément de saisie (4), et la découpe du fil (3), au moyen de l'interférence du fil (3) avec ledit élément de découpe (5), et vice versa, caractérisé en ce qu'il comprend des moyens d'espacement (11), qui sont interposés entre ledit élément de maintien (2) et ledit élément de saisie (4) afin de limiter l'étendue des contraintes sur le fil (3) pendant sa traction entre ledit élément de maintien (2) et ledit élément de saisie (4).
  2. Dispositif selon la revendication 1, caractérisé en ce que lesdits moyens d'espacement (11) peuvent être désengagés dudit élément de maintien (2) et/ou dudit élément de saisie (4) juste avant la découpe du fil (3) par ledit élément de découpe (5), c'est-à-dire juste avant l'interférence du fil (3), agencé dans l'évidement (6) dudit élément de maintien (2), avec ledit élément de découpe (5).
  3. Dispositif selon les revendications 1 et 2, caractérisé en ce que ledit élément de saisie (4) a un corps lamellaire qui est dirigé vers un côté dudit élément de maintien (2), lesdits moyens d'espacement (11) étant constitués d'une saillie (12) sur le côté dudit élément de saisie (4) qui est dirigé vers ledit élément de maintien (2).
  4. Dispositif selon la revendication 3, caractérisé en ce que ledit élément de maintien (2) a une partie (2a) qui peut engager ladite saillie (12) dans sa course pour passer de ladite position d'attente à ladite position de retenue, sauf pour la partie de fin de ladite course.
  5. Dispositif selon la revendication 4, caractérisé en ce que ladite partie (2a) de l'élément de maintien (2) se désengage de ladite saillie (12) juste avant que ledit élément de découpe (5) interfère avec le fil (3) agencé dans l'évidement (6) dudit élément de saisie (2).
  6. Dispositif selon une ou plusieurs des revendications 3 à 5, caractérisé en ce que ladite saillie (12) est constituée d'une marque de poinçon qui fait saillie à partir du côté dudit élément de saisie (4) qui est dirigé vers ledit élément de maintien (2).
  7. Dispositif selon une ou plusieurs des revendications précédentes, caractérisé en ce qu'au moins un entre le corps lamellaire dudit élément de maintien (2) et/ou le corps lamellaire dudit élément de saisie (4) est élastiquement flexible et est sollicité élastiquement contre l'autre corps.
EP11154804.6A 2010-03-05 2011-02-17 Dispositif de préhension de fil et de découpe, particulièrement pour doigts de fils à bandes pour machines à tricoter ou similaire Not-in-force EP2363519B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2010A000364A IT1398548B1 (it) 2010-03-05 2010-03-05 Dispositivo per la pinzatura ed il taglio del filo, particolarmente per guidafili rigatori per macchine per maglieria o simili.

Publications (2)

Publication Number Publication Date
EP2363519A1 EP2363519A1 (fr) 2011-09-07
EP2363519B1 true EP2363519B1 (fr) 2014-11-26

Family

ID=43216406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11154804.6A Not-in-force EP2363519B1 (fr) 2010-03-05 2011-02-17 Dispositif de préhension de fil et de découpe, particulièrement pour doigts de fils à bandes pour machines à tricoter ou similaire

Country Status (5)

Country Link
EP (1) EP2363519B1 (fr)
KR (1) KR20110101078A (fr)
CN (1) CN102191619B (fr)
IT (1) IT1398548B1 (fr)
TW (1) TW201144504A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019160175A1 (fr) * 2018-02-14 2019-08-22 양진석 Dispositif de marquage pour machine à tricoter circulaire

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101505601B1 (ko) * 2013-07-05 2015-03-26 양진석 색사전환장치의 실 절단장치
TWI610002B (zh) * 2015-06-02 2018-01-01 佰龍機械廠股份有限公司 圓形針織機之變色裝置的夾切紗結構
TR201802784T4 (tr) * 2015-06-11 2018-03-21 Pai Lung Machinery Mill Co Ltd Bir dairesel örgü makinesinin bir şerit çekme cihazı için iplik kırpma ve kesme yapısı.
CN106319745B (zh) * 2015-06-15 2018-12-14 佰龙机械厂股份有限公司 圆形针织机的变色装置的夹切纱结构
CN109881346B (zh) * 2017-12-06 2020-06-02 佰龙机械厂股份有限公司 圆形针织机的电子式换纱装置
CN110644127B (zh) * 2019-10-22 2024-03-15 泉州全能智控机械研究所有限公司 调线头

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
IT997240B (it) * 1973-09-10 1975-12-30 Billi Spa Dispositivo di taglio dei fili per macchine circolari da calze e simili
IT1132648B (it) * 1979-09-28 1986-07-02 Wildt Mellor Bromley Ltd Unita' di caricamento e cambiamento fili
CS255218B1 (en) * 1986-07-29 1988-02-15 Milan Fucik Striping device for a circular knitter
CS263104B1 (en) * 1987-10-06 1989-04-14 Borivoj Fucik Device for thread cutting and holding
DE19511949B4 (de) * 1995-03-31 2009-10-15 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Strickmaschine und Fadenwechselvorrichtung
IT1312329B1 (it) * 1999-05-26 2002-04-15 Mecmor Spa Dispositivo per l'alimentazione selettiva dei fili in macchine permaglieria o simili.
ITMI20061877A1 (it) * 2006-09-29 2008-03-30 Santoni Spa Dispositivo per l'alimentazione dei fili per macchine per maglieria,particolarmente per macchine circolari per maglieria
CN201217733Y (zh) * 2008-06-18 2009-04-08 冯发泉 自动调线器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019160175A1 (fr) * 2018-02-14 2019-08-22 양진석 Dispositif de marquage pour machine à tricoter circulaire

Also Published As

Publication number Publication date
IT1398548B1 (it) 2013-03-01
ITMI20100364A1 (it) 2011-09-06
CN102191619A (zh) 2011-09-21
CN102191619B (zh) 2014-12-10
KR20110101078A (ko) 2011-09-15
TW201144504A (en) 2011-12-16
EP2363519A1 (fr) 2011-09-07

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