EP0115060B1 - Dispositif de tension du tricot pour un métier à tricoter - Google Patents

Dispositif de tension du tricot pour un métier à tricoter Download PDF

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Publication number
EP0115060B1
EP0115060B1 EP83113042A EP83113042A EP0115060B1 EP 0115060 B1 EP0115060 B1 EP 0115060B1 EP 83113042 A EP83113042 A EP 83113042A EP 83113042 A EP83113042 A EP 83113042A EP 0115060 B1 EP0115060 B1 EP 0115060B1
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EP
European Patent Office
Prior art keywords
elements
knitwork
tensioning
reed
cam
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
EP83113042A
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German (de)
English (en)
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EP0115060A1 (fr
Inventor
Riccardo Tenconi
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Mec Mor SpA
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Mec Mor SpA
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    • 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
    • D04B15/88—Take-up or draw-off devices for knitting products

Definitions

  • This invention relates to a knitwork tensioning device for a knitting machine.
  • Such devices generally provide a tension force which is applied across the region between the rollers and needles, and hence, owing to the separation and elasticity of the intervening knitwork, can not always prevent the knitwork loops being formed from following the needle movements.
  • knit fabrics are formed which have patterns including short and long knitwork loops, then a different tension is exerted on the two loop types, as due to their different elasticity, and this may easily result in faulty loops.
  • a further object is to provide such a device which is of simple construction and may be advantageously incorporated to any type, whether circular or flat, of knitting machine, and may also be used in combination with conventional roller devices.
  • a knitwork tensioning device for a knitting machine having at least one needle bed, comprising a knitwork engagement and tensioning means located within the knitting machine, the device being characterized in that said means comprises a plurality of tensioning elements of substantially plate-like configuration supported at one portion thereof and each having an opposed portion located in the proximity of the needles, said opposed portion being movable between a knitwork disengagement position and a knitwork engagement and tensioning position in cooperation with a knitwork bearing surface on said needle bed.
  • a device of the above type allows the knitwork to be held directly in the proximity of the needles, thus preventing them materially from dragging the knitwork loops therewith in their exiting movements.
  • a somewhat elastic construction of the tensioning elements such as in the form of reed-like flexible elements, affords advantageous flexing capabilities for such elements, thereby it becomes possible to provide, through a simple articulated support of the individual elements and a rotational movement thereof, first an engagement of the knitwork with the needle bed inner surface, and secondly, upon the elements flexing as a result of a further slight rotation, automatic application of a gentle tension on the knitwork on the needle bed inner surface.
  • the construction including individual tensioning elements cooperating with a bearing surface for the knitwork being formed advantageously enables said elements to span the whole area of knitwork formation, and to also utilize the device for contoured open fabrics, by virtue of the tensioning elements being caused to act directly on the knitwork being formed.
  • the tensioning element width may vary according to individual requirements, with the tensioning elements being allowed to simultaneously engage several loops in one course.
  • the knitting machine 1 ( Figures 1 and 2) comprises a needle cylinder 2 and dial 3, wherein needles 4 and 5, respectively, are mounted slidably as driven in a conventional fashion.
  • the machine 1 further comprises a means 6 for engaging and tensioning a knitwork 7, which means is located within the machine 1.
  • Said means includes a plurality of reed-like tensioning elements 8, each supported at one end 9 inside the cylinder 2 and having an opposed end 10 located next to the needle 4, 5.
  • Said end 10 is configured for engagement with the knitwork 7, as explained hereinafter.
  • the reed-like tensioning elements 8 each have their end 9 attached to a respective supporting element 11 in the form of a small block pivoted at 12 to a respective supporting bracket 13, the bracket 13 being fastened under the dial 3. It may be appreciated that in the embodiment shown, the reed-like tensioning elements 8 are laid side-by-side all around the axis of the machine 1, that is, they have a limited width and their pivot axes 12 are laid along a broken line enveloping a circumference concentric with the axis of the machine 1.
  • each supporting element or block 11 there are arranged a pin 14 and small pivot pin 15 acting in opposite directions.
  • the pin 14 is movable in a respective radial seat 16 in the dial holding structure 3a and its remote end from that engaging with the block 15 is adapted to follow the profile of a cam 17 which is carried by the cam structure 3b of the machine and, accordingly, driven of relative motion to the supporting structure for the reed-like elements 8.
  • the cam 17 is of the ring type.
  • the small pivot pin 15 is accommodated within a blind seat 18, and is subjected to the action of a spring 19, provided in the seat 18, to keep constant the engagement of the block 11 with the pin 14 and hence the engagement of the latter with the cam 17.
  • each reed-like element 8 is arranged to bear on the inside bevel 3c of the dial 3, the pin 14 contacting then a depression 17a in the cam 17.
  • One end 10 of each reed-like element 8 barely clears the outer circumference of the dial 3 without hindering the movement of the knitwork 7 through the gap between the cylinder 2 and dial 3.
  • the knitwork 7 is pulled down by its own weight, or alternatively by a gentle action tensioner, not shown.
  • the needles 4 of the cylinder 2 are raised (and the needles 5 of the dial 3 thrust outwards) and the knitwork loops are to be held back to prevent them from being dragged away by the needles 4, 5, the radially outermost profile of the cam 17 becomes operative to push the pins 14 slightly outwards and cause the supporting block 11 of the respective reed-like elements 8 to perform a partial rotation.
  • This rotational movement results in the ends 10 being moved into a position of engagement with the knitwork 7, which is clamped between said ends 10 and the internal surface of the cylinder 2 on which the knitwork 7 rests.
  • the cam 17, and consequently the thrust on the block 11, are designed to also impress on the reed-like elements 8 a deflection (position shown in full lines in Figure 2 and dash lines in Figure 1), thereby there occurs a slight downward displacement of the ends 10 across the internal surface of the needle bed, which thing leads to a slight tension being applied to the knitwork loops.
  • a deflection position shown in full lines in Figure 2 and dash lines in Figure 1
  • any movements of the loops is effectively prevented and the loops move past the respective needle latches of the exiting needles, and hence, into a position where they can be positively discharged on the successive re-entering movement of the needles 4, 5.
  • the engagement phase of the knitwork 7 is limited to the phase of outward movement of the needles 4, 5, whereas during the re-entering phase of the needles the reed-like elements 8 are returned to an inoperative condition wherein the knitwork 7 is allowed to move down prior to being re-engaged at the following course.
  • the relieve provided in the needle beds of Figure 2 advantageously increases the space available for inserting the knitwork between the needle beds and favors an increased pull after the clamping phase.
  • the reed-like elements 8 are housed in the relieve of the dial 3, and in the engaged position, they engage the knitwork 7 in the relieve of the cylinder 2.
  • the increased travel distance of the ends 10 of the reed-like elements 8 results in a stronger pull being applied on the knitwork 7.
  • Figure 4 illustrates a reed-like element 8' having a hooked working end which can penetrate the courses and increase the pull force.
  • a circular knitting machine 21 has a needle cylinder 22 and dial 23, with respective needles 24 and 25.
  • the means 26 for engaging and tensioning the knitwork 27, again located within the machine, comprises a plurality of tensioning elements 28 of substantially plate-like configuration and being each supported at one portion within the cylinder 22, each element having an opposed portion located in the proximity of the needles 24, 25.
  • Each tensioning element 28 is pivoted at 29 to a respective first supporting element 30 in the form of a lever pivoted, in turn, at 31 to a supporting block 32 attached to the dial holder 23a.
  • a spring 35 is placed between each tensioning element 28 and lever element 30 so as to pull the tensioning element 28 toward the dial 23.
  • the spring 35 is only required to overcome the action due to the weight of the tensioning element 28, and will accordingly be a rather weak one.
  • a more powerful spring 36 is arranged to act between the lever element 30 and a fixed point 37 to maintain the lever element 30 in contact with the rod-like element 33, and hence, the latter in contact with the ring cam 34.
  • a stop 38 defines the home position of the lever element 30.
  • each tensioning element 28 is connected, allowing a degree of play, through a respective link 39, to one end of a respective second lever element 40, pivoted at 41 to the supporting block 32 and having a peripheral section 42 in contact with one end of a rod-like control element 43.
  • the latter is passed vertically through the dial 23 and dial holder 23a close to the rod-like element 33, and engages at its other end with the bottom profile of a ring cam 44, attached to the cam structure 23b.
  • a spring 45 tends to hold the lever element 40 engaged with the rod-like element 43 and the latter with the cam 44.
  • the tensioning elements 28 are of course arranged along a broken line, similarly to the reed-like elements 8. They may also be likened to reed-like elements, but having a greater thickness than the elements 8.
  • the profile of the cams 34 and 44 for each yarn feed location is shown in Figure 7 where the needle pattern during the knitting phase is also shown schematically, similarly to the embodiment first-described hereinabove.
  • the cam 34 has a profile including a substantially sharply downward sloping section 34a, a short horizontal section 34b, and a gently upward sloping section 34c followed by a long horizontal section 34d.
  • the cam 44 has a substantially sharply downward sloping section 44a located slightly upstream of the section 34a (in the direction of movement of the needles), a horizontal section 44b as far as the end of the downward sloping section 34a of the cam 34, followed by a substantially vertical raising section 44c at the end of the downward sloping section 34a of the cam 34 and by a final horizontal section 44d.
  • the device On completion of the withdrawal movement of the needles 24, 25, the device occupies the position indicated with full lines in Figure 5, and the rod-like elements 33 and 43 engage respectively with the sections 34d and 44d of the cams 34 and 44. Thereafter, as the needles 24 barely begin to move up, the section 34a of the cam 34 comes into operation, and the tensioning elements 28 will move into the position indicated with dash lines in Figure 5, as allowed by the play between the links 39 and lever elements 40, and the various springs provided. On reaching the lowermost point in the downward sloping section 34a, the section 44c of the cam 44 becomes operative, and owing to the springs coming into play, the position indicated with full lines in Figure 6 is reached.
  • the tensioning elements could be each attached to a small block such as the block 11 in the embodiment of Figures 1-4 to support the block in an articulated fashion at one end of a lever pivoted to the structure which carries the needles of the dial 23. Another end of the lever, as well as the block itself, would then be controlled by respective rod-like elements under the action of suitably contoured cams and against the bias force of an elastic means, so as to move the tensioning elements with a component in the direction of the knitwork bearing surface on the needle bed.
  • a pressure is exerted on the knitwork by the spring 45 along with a tension supplied by the spring 36.
  • the springs 45 and 36 may be made adjustable.
  • the device according to the invention is made up essentially of clamps or grippers, one element whereof is formed by the reed-like element proper, and the other by the machine needle bed. This affords a marked simplification of the tensioning device.
  • the tensioning elements which may be steel reeds, have a width dimension which depends in particular on the needle density and steepness of the lift cams therefor. More specifically, the tensioning elements will be made wider where the cams are less steep, and viceversa. In a practical embodiment with a large diameter circular knitting machine, optimum results have been obtained with reed-like elements 30 mm wide. Of course, it would be preferable to have their ends 10 follow the curved line of circular machines, at least above a certain width of the reed-like elements and below a certain diameter of the machines.
  • the reed-like elements 8 could have their ends 9 attached to the dial holder 3a and the pins 14 could be arranged to act directly onto the surface of the respective reed-like elements to deflect them into their working position. Return of each reed-like element to its home position would be ensured by the elasticity of the element itself.

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

Claims (10)

1. Dispositif de tension d'un tricot pour métier à tricot ayant au moins une planche d'aiguilles, comprenant des moyens d'engagement et de tension du tricot (6, 26) situés à l'intérieur du métier à tricot (1, 21), caractérisé en ce que lesdits moyens (6, 26) comprennent une pluralité d'éléments de tension (8, 28) essentiellement en forme de plaque fixés sur une de leurs parties et ayant chacun une partie opposée située dans le voisinage des aiguilles (4, 5; 24, 25), ladite partie opposée étant mobile entre une position de dégagement du tricot et une position d'engagement et de tension du tricot en coopération avec une surface d'appui du tricot sur ladite planche des aiguilles.
2. Dispositif selon la revendication 1, caractérisé en ce que lesdits éléments de tension comprennent des éléments en forme de lame (8), et qu'il est associé à chaque élément en forme de lame (8), une cheville (14) pour déplacer ladite partie opposée (9), ladite cheville (14) suivant le profil d'une came (17) animée d'un mouvement relatif par rapport à la structure (3a) portant lesdits éléments en forme de lame (8).
3. Dispositif selon la revendication 2, caractérisé en ce que lesdits éléments en forme de lame (8) sont chacun fixés à un bloc de support respectif (11) monté à rotation sur une planche d'aiguilles dans le métier (1) et actionnés par une desdites chevilles (14), de petites goupilles (15) comprimées chacune par un ressort agissant sur chacun des blocs (11), dans une direction opposée à celle des chevilles (14), afin de maintenir les blocs (11) en contact constant avec lesdites chevilles (14) et donc lesdites chevilles (14) avec ladite came (17).
4. Dispositif selon la revendication 2 ou la revendication 3, caractérisé en ce que ladite came (17) est profilée pour imprimer une flexion sur lesdits éléments en forme de lame (8) afin de tendre le tricot (7) dans la position engagée.qui suit l'engagement lui-même.
5. Dispositif selon la revendication 1, caractérisé en ce que lesdits éléments de tension (28) sont appuyés de manière articulée sur au moins un élément de support respectif en forme de levier (30) monté à rotation sur un bloc d'appui (32) solidaire de la machine portant les aiguilles (24, 25), de telle sorte que le point de support desdits éléments de tension (28) peut effectuer un mouvement de translation essentiellement dans la direction de la surface d'appui des tricots sur la planche des aiguilles.
6. Dispositif selon la revendication 5, caractérisé en ce que lesdits éléments de tension (28) sont chacun montés à rotation sur une extrémité d'un premier élément de levier respectif (30), l'autre extrémité étant soumise à l'action d'une extrémité d'un élément de contrôle en forme de barre (33) traversant verticalement le disque des aiguilles (23) et ayant l'extrémité opposée en contact constant avec le profil d'une came annulaire (34) fixée sur la structure de came de la machine (23b) animée d'un mouvement relatif par rapport aux aiguilles (24; 25).
7. Dispositif selon la revendication 5 ou la revendication 6, caractérisé en ce que lesdits éléments de tension (28) sont reliés, avec un certain jeu, à l'aide d'une tige respective (39) à un second élément de levier respectif (40) tangentiellement engagé sur une de ses parties (42) avec une extrémité d'un élément de contrôle en forme de barre (43) traversant verticalement le disque des aiguilles (23) et ayant son extrémité opposée engagée constamment avec le profil d'une came annulaire (44) fixée à la structure de came (23b) animée d'un mouvement relatif par rapport aux aiguilles (24, 25).
8. Dispositif selon la revendication 6, caractérisé en ce que ladite came annulaire de contrôle (34) des premiers éléments de levier (30) a, pour chaque fournisseur de fil du métier, une section essentiellement en forte pente (34a), suivie d'une courte section horizontale (34b), d'une section remontant doucement (34c) et d'une section finale horizontale (34d).
9. Dispositif selon les revendications 6, 7 et 8, caractérisé en ce que ladite came annulaire de contrôle (44) des seconds éléments de levier (40) comprend une section essentiellement en forte pente (44a) suivie d'une section horizontale (44b) correspondant à la section descendante (34a) de la came de contrôle (34) des premiers éléments de levier (30), suivie d'une section (44c) remontant verticalement à l'extrémité de la section descendante (34a) de la came de contrôle (34) des premiers éléments de levier (30), et d'une section finale horizontale (44d).
10. Dispositif selon l'une des revendications 2 à 4, caractérisé en ce que les éléments en forme de lame sont chacun fixés à un bloc respectif monté à rotation sur une extrémité de levier lui-même monté à rotation sur un bloc d'appui fixé à la structure de support des aiguilles, ledit bloc et ledit levier étant actionnés par des éléments de contrôle respectifs en forme de barre agissant contre la force de rappel de moyens élastiques propres à animer les éléments en forme de lame d'un mouvement de translation dans la direction de la surface d'appui du tricot sur la planche des aiguilles.
EP83113042A 1982-12-29 1983-12-23 Dispositif de tension du tricot pour un métier à tricoter Expired EP0115060B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2503382 1982-12-29
IT25033/82A IT1198421B (it) 1982-12-29 1982-12-29 Dispositivo di tensionamento della maglia in una macchina per maglieria

Publications (2)

Publication Number Publication Date
EP0115060A1 EP0115060A1 (fr) 1984-08-08
EP0115060B1 true EP0115060B1 (fr) 1986-11-12

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Family Applications (1)

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EP83113042A Expired EP0115060B1 (fr) 1982-12-29 1983-12-23 Dispositif de tension du tricot pour un métier à tricoter

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EP (1) EP0115060B1 (fr)
JP (1) JPS59173352A (fr)
DE (1) DE3367636D1 (fr)
IT (1) IT1198421B (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1417697A1 (de) * 1961-06-14 1968-10-10 Kandler Dr Habil Ludwig Verfahren zur Herstellung und erforderlichenfalls Regenerierung fein verteilter,hochaktiver fixierter Metalloxyd- bzw. Metallhydroxyd- oder Metallkatalysatoren

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US218460A (en) * 1879-08-12 Improvement in web-holiding mechanisms for knitting-machines
US3003342A (en) * 1956-08-24 1961-10-10 Bentley Eng Co Ltd Fabric tensioning devices for knitting machines
FR1417697A (fr) * 1964-12-16 1965-11-12 Solis Soc A R L Dispositif mécanique destiné à assurer la tension du tricot au cours de sa formation sur les métiers à cylindre rotatif pour la fabrication de bas et articles similaires
GB1208247A (en) * 1968-04-19 1970-10-07 Francesco Lonati A pusher unit for double cylinder knitting machines
CS198456B1 (cs) * 1977-03-11 1980-06-30 Jaroslav Docekal Odtahové a napínací zařízení úpletu okrouhlého pletacího stroje
DE2803135C2 (de) * 1978-01-25 1986-10-09 H. Stoll Gmbh & Co, 7410 Reutlingen Gestrickabzugsvorrichtung für Flachstrickmaschinen
CS197852B1 (en) * 1978-04-24 1980-05-30 Miloslav Losert Fabric drawing-off and tensioning device for circular knitting frames

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1417697A1 (de) * 1961-06-14 1968-10-10 Kandler Dr Habil Ludwig Verfahren zur Herstellung und erforderlichenfalls Regenerierung fein verteilter,hochaktiver fixierter Metalloxyd- bzw. Metallhydroxyd- oder Metallkatalysatoren

Also Published As

Publication number Publication date
EP0115060A1 (fr) 1984-08-08
IT1198421B (it) 1988-12-21
IT8225033A0 (it) 1982-12-29
JPS59173352A (ja) 1984-10-01
JPH0340138B2 (fr) 1991-06-18
DE3367636D1 (en) 1987-01-02

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