EP1834017A1 - Dispositif et procede de liaison automatique dans des machines a tricoter et machine incorporant ce dispositif - Google Patents

Dispositif et procede de liaison automatique dans des machines a tricoter et machine incorporant ce dispositif

Info

Publication number
EP1834017A1
EP1834017A1 EP04806869A EP04806869A EP1834017A1 EP 1834017 A1 EP1834017 A1 EP 1834017A1 EP 04806869 A EP04806869 A EP 04806869A EP 04806869 A EP04806869 A EP 04806869A EP 1834017 A1 EP1834017 A1 EP 1834017A1
Authority
EP
European Patent Office
Prior art keywords
yarn
working
secondary yarn
machine
rod
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.)
Withdrawn
Application number
EP04806869A
Other languages
German (de)
English (en)
Inventor
Renato Pilotelli
Roberto Pilotelli
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.)
Pilotelli Macchine Tessili Srl
Original Assignee
Pilotelli Macchine Tessili Srl
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 Pilotelli Macchine Tessili Srl filed Critical Pilotelli Macchine Tessili Srl
Publication of EP1834017A1 publication Critical patent/EP1834017A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • D04B35/14—Indicating, warning, or safety devices, e.g. stop motions responsive to thread breakage
    • 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
    • D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
    • D04B15/80—Devices for determining or controlling patterns ; Programme-control arrangements characterised by the thread guides used

Definitions

  • the present invention relates to improvements to knitting machines and in particular, although not exclusively, to circular knitting machines with a large diameter for the production of knitted fabrics, with particular regard for the devices to feed the yarn to the needles.
  • Knitting machines in particular circular knitting machines with a large diameter, have a number of feeds which varies and may even be noteworthy.
  • the yarn fed by each feed to the needle beds of the cylinder and of the dial must be controlled continuously to promptly detect any interruption or breakage thereof.
  • machines are equipped with a stop system which halts the machine if one of the feed yarns is missing, for example, due to a breakage. This control and stop system is applied to each single feed and the breakage of any one of the yarns fed to the machine triggers a stop signal for the machine.
  • the main object of the present invention is to provide a device and a method which diminish or overcome the aforesaid problems related to breakages interruption of the working yam.
  • the present invention relates to a device to automatically replace a working yarn in a knitting machine with a secondary yarn, in the event of breakage of the working yarn, comprising: a path for the working yarn; a yarn guide for the working yarn; a retention member for the secondary yarn; a support for said secondary yarn.
  • the support is susceptible to move between an idle position, in which the secondary yarn is held in a stand-by position, outside the working area of the needles of the machine, and a working position, in which the secondary yarn is transferred to the needles of the machine.
  • the secondary yarn support is held in the idle position by the working yarn.
  • the working yarn can be held at the end of a rod oscillating about an axis integral with the machine structure.
  • the working yarn passes along the rod holding it in the raised position, so that the secondary yam is held out of the working area of the needles. If the working yarn breaks, the rod is no longer supported and oscillates downwards, taking the secondary yarn directly to the working area of the needles, which pick up the secondary yarn and utilize it in place of the working yarn.
  • a sensor such as a microswitch or the like
  • this sensor is currently already present and is used to generate the signal which causes the machine to stop in the event of interruption of one of the feed yarns.
  • the signal of this sensor can also be made to control an actuator which acts directly on the support of the secondary yarn so that it is carried to the working area of the needles.
  • the support of the secondary yarn has a very small mass and can be controlled promptly to carry the secondary yam immediately to the working area of the needles, in this way replacing the working yarn with the secondary yarn, to obtain the aforesaid results and advantages.
  • the present invention relates to a knitting machine, typically a circular knitting machine and with a large diameter in particular, comprising at least one feed of a working yarn, wherein a device of the aforesaid type is associated with said at least one feed to promptly carry a secondary yam to the working area if the working yarn is interrupted for any reason.
  • the present invention relates to a method to automatically replace a working yarn with a secondary yam in a knitting machine in the event of breakage of the working yarn, comprising the - A -
  • an alarm or stop signal of the machine is also advantageously generated in the event of interruption of the working yarn.
  • transfer of the secondary yarn from the idle position to the operating position is caused directly by breakage or, in any case, by interruption of the working yarn.
  • transfer of the secondary yarn to the working area of the needles can take place indirectly, by means of production of an alarm signal by a sensor that detects interruption of the working yarn, said signal, by means of a control unit or in another appropriate way, then controlling activation of an actuator that carries the secondary yarn into operation.
  • the secondary yarn When the secondary yarn is carried into operation directly through the effect of breakage or interruption of the working yarn, the secondary yarn can, in practice, be supported by a mechanical support, which is held in the idle position by the working yarn, and interruption of the working yarn can cause, for example through the effect of its own weight, the mechanical support and the secondary yarn to move to the operating position.
  • Figure 1 is an overall axonometric view of a circular machine with a large diameter
  • Figure 2 is a local section according to a plane containing the axis of the cylinder and of the dial, showing the stitch forming area;
  • Figure 3 is a perspective view of a portion of needle beds and of two consecutive feeds with the working yarn working correctly;
  • Figure 4 is a front view of a portion of the needle beds with three feeds in normal working conditions;
  • Figures 5 and 6 are respectively a perspective and front view of a portion of the needle beds and of a feed, with the working yarn interrupted and the secondary yarn working;
  • Figures 7 and 8 are views analogous to the views in Figures 5 and 6 in a variant of embodiment;
  • Figure 9 is a block diagram of the control system;
  • Figure 10 is a front view of a portion of the needle beds with three feeds in normal working conditions, in a different embodiment of the invention.
  • Figure 11 is an enlarged perspective view of a portion of the needle beds with devices produced as shown in Figure 10, in normal operating conditions;
  • Figure 12 is a front view of a device in Figure 11 ;
  • Figure 13 is a front view analogous to the view in Figure 12, but in conditions of breakage of the working yarn and operation of the secondary yarn;
  • Figure 14 is an axonometric view analogous to the view in Figure 11 , in conditions of breakage of the working yarn and operation of the secondary yam;
  • Figures 15(A)-15(D) are axonometric views according to various angles of the device in Figures 10 to 14, isolated from the machine;
  • Figure 16 is a front view of a portion of the needle beds with automatic linking devices according to the invention in a further embodiment
  • Figure 17 is an enlarged front view of one of the devices in Figure 16 in normal operation conditions with the working yarn fed correctly;
  • Figure 18 is an axonometric view of two consecutive devices in the embodiment in Figures 16 and 17 in conditions of normal operation; and
  • Figures 19(A)-19(D) are axonometric views according to various angles of the device in Figures 16 to 18, isolated from the machine. Detailed description of the preferred embodiments of the invention
  • Figure .-I schematically shows an axonometric view of a circular machine with a large diameter, indicated as a whole with 1.
  • the number 3 indicates the load bearing structure
  • 5 indicates a casing enclosing the stitch forming and yarn feed area
  • 7 indicates some of the groups of cams or locks for controlling the needles of the rotating cylinder.
  • Figure 2 shows a section according to a radial plane of the needle beds (sectors of cylinder cams 9 and sectors of dial cams 11) and of the load bearing structure 3.
  • FIG. 3 to 8 A first example of embodiment of the device according to the invention is shown in Figures 3 to 8.
  • Figures 3 and 4 show an axonometric and a front view of an enlargement of the stitch forming area, with a plurality of feeds (two in Figure 3 and three in Figure 4).
  • the numbers 21 and 23 indicate the groups of cams or locks for controlling the needles 25 of the dial and 27 of the cylinder.
  • a feed of a working yarn FL is associated with each group of control cams.
  • the yarn FL of each feed is fed from a reel above, not shown, and passes through an eye 29 in ceramic material fastened to the structure of the machine by a bracket 31. Under the eye 29 the working yarn FL passes through a respective yarn guide 33 which feeds the yarn to the needles of the two needle beds.
  • a support for a secondary yarn FA is associated with each yarn guide
  • the support comprises a rod 35, one end of which is hinged in 37 to the respective yarn guide.
  • the rod is hinged loosely, so that in the absence of support it oscillates downwards through the effect of its own weight, for the purposes described below.
  • the distal end of the rod (that is, the cppcsits end to the one hinged to the yam guide 33) is provided with a sleeve 39 through which the secondary yarn FA passes, and which forms an engaging member of said secondary yarn.
  • Each secondary yarn FA comes from a reel or bobbin above, not shown, and passes through a respective tube 41 , approximately vertical (in the drawing), connected to the respective yarn guide 33.
  • Each tube 41 is provided at the lower end thereof with a helical spring 43 used to hold and constrain the initial end of the secondary yarn FA coming from the adjacent tube and therefore pertaining to the adjacent feed.
  • each secondary yarn FA thus defines a span between two ends of two adjacent tubes 41 , and along this span it is engaged in the sleeve 39 associated with the respective feed.
  • each secondary yarn FA comes from the tube 41 located on the right of the respective sleeve 39, and the free end thereof is connected to the helical spring 43 associated with the tube 41 located on the left of the sleeve 39.
  • the working yarn FL When the working yarn FL is integral and is correctly fed by the respective yam guide 33 to the needles 25, 27, it defines a stretch extending between the eye 29 and the yarn guide 33, which passes in front of and under the respective rod 35. Therefore, in practice the rod is in an inclined position with respect to the vertical and intercepts the path of the working yarn FL.
  • the hinge 37 of the rod is above and on one side of the yarn guide 33, and the engaging member of the secondary yarn associated with the free end of the rod, represented by the sleeve 39, is in a higher position to the yarn guide 33, but below the axis of the hinge 37 and on the opposite side with respect to said hinge 37.
  • the working yarn FL thus provides the rod with sufficient support for it to be held in the raised position. In this raised position the sleeve 39 through which the secondary yarn FA passes holds the latter outside the working area of the needles 25, 27. Therefore, in this arrangement the support of the secondary yarn FA is in an idle and stand-by position.
  • the rod In the event of interruption of feed of the yarn FL, for example due to breakage, the rod is no longer supported and, through the effect of its own weight ; osculates downwards until it is resting on a fixed stop 51 (see in particular Figure 3) which defines the working position of the support of the secondary yarn FA, said support being formed by the rod 35 and by the sleeve 39.
  • the lowered position of the rod 35 is shown in Figures 5 and 6.
  • the span of the secondary yarn FA extending between two adjacent tubes 41 is thus positioned in the working area of the needles 25 of the dial and 27 of the cylinder.
  • the yarn FA is picked up by the needles and automatically replaces the interrupted working yarn FL.
  • a sensor is suitably disposed along the path of each working yarn FL, said sensor being capable of detecting interruption of ⁇ the yarn and of producing an alarm signal which halts the machine appropriately in the times required, in consideration of the operating speed and the inertias involved.
  • the machine can come to a complete halt even after a substantial fraction of a turn without serious drawbacks, thanks to operation of the secondary yarn.
  • FIG. 9 schematically shows a block diagram of the control for one feed.
  • the bobbins of working yarn FL and of secondary yam FA are indicated respectively with BL and BA.
  • the two sensors along the path of the yarns FL and FA are indicated with 53 and 55 and the control unit, connected in a known way to the drive of the machine and, if necessary, to a user interface, is indicated with 57.
  • the control unit 57 will be interfaced with the same number of sensors as the number of working yarns and secondary yarns of the machine, equivalent to the number of feeds.
  • the signal for device operation comes directly from breakage of the working or feed yarn, as it is a physical constraint for the rod. This ensures that the rod receives the signal that the yarn has broken, remaining in a state of unbalance; -movement of the rod takes place through the effect of its own weight and is therefore instantaneous.
  • the device is able to operate immediately when the feed or working yarn has zero tension;
  • Figures 7 and 8 show, in views equivalent to those in Figures 3 and 4, a modified embodiment, in which the sleeve 39 at the end of the rod forming the engaging member of the secondary yarn FA is replaced by a specific seat, indicated with 39A, obtained by shaping the end part of the rod 35.
  • the remaining parts of the device are identical to those described previously.
  • the operating principle is based on the fact that the rod is able to drop when no longer supported by the feed yarn. Any build-up of dirt at the level of the hinge point of the rod could obstruct downward movement thereof, also in the event of breakage of the yarn FL.
  • a portion of the machine is enclosed by the casing 5 ( Figures 1 and 2) and air is continuously input into and withdrawn from the internal volume of the casing.
  • air will not only be removed by suction, leaving entry solely to air flowing through the points of the casing which are not sealed.
  • air can be blown into the volume enclosed by the casing by means of specific compressed air pipes to create turbulence therein, which maintains the fibers dispersed by the yarn in suspension. In this way it is possible to remove the fibers by suction so that the area involved by operation of the automatic linking device is kept clean.
  • Figures 10 to 18 show an improved embodiment of the device according to the invention. Identical numbers indicate identical or equivalent parts with respect to the embodiment shown in Figures 3 to 8.
  • the first difference between the embodiment in Figures 10 to 18 and the embodiment in Figures 3 to 8 consists in the fact that the free end of each secondary-yarn FAHS not held by a spring 43 connected to the lower end of the feed tube 41A of the secondary yarn of the adjacent device, but by a spring 43A connected to the machine structure.
  • the rod 35 has an eye 39B in place of a sleeve 39 having the same functions as the latter.
  • the tube 41 A (equivalent to the tube 41) in this case is much shorter and is carried by a supporting block 61 forming a supporting member to which the yarn guide 33 is also connected.
  • This supporting member 61 carries a reel BA of secondary yarn FA. This is unwound upwards and passes through a horizontal guide tube 63 above, and from here extends downwards through the tube 41A to engage with the spring 43A.
  • Figures 16 to 19 show a further embodiment. Identical numbers indicate parts identical or corresponding to those of the previous examples of embodiment.
  • each secondary yarn is held by a helical spring 43B connected to one end of an L-shaped bracket or bar 65, connected rigidly to the member 61 which supports the bobbin BA of secondary yarn FA and the tube 41A.
  • the remaining part of the configuration is essentially identical to that of Figures 10 to 15. It is understood that the drawing purely shows a practical embodiment of the invention, which may vary in forms and layouts, without however departing from the scope of the concept on which the invention is based.

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

Abstract

L’invention concerne un dispositif comprenant : un chemin pour le fil de l’ouvrage (FL) ; un guide-fil (33) pour le fil de l’ouvrage ; un élément de retenue (43 ; 43A ; 43B) pour le fil secondaire (FA) ; un support (35, 39) pour ledit fil secondaire. Le support pour le fil secondaire est mobile entre une position d’attente inactive et une position fonctionnelle, dans laquelle le fil secondaire est transféré aux aiguilles de la machine (25, 27).
EP04806869A 2004-12-17 2004-12-17 Dispositif et procede de liaison automatique dans des machines a tricoter et machine incorporant ce dispositif Withdrawn EP1834017A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2004/000704 WO2006064528A1 (fr) 2004-12-17 2004-12-17 Dispositif et procede de liaison automatique dans des machines a tricoter et machine incorporant ce dispositif

Publications (1)

Publication Number Publication Date
EP1834017A1 true EP1834017A1 (fr) 2007-09-19

Family

ID=34979621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04806869A Withdrawn EP1834017A1 (fr) 2004-12-17 2004-12-17 Dispositif et procede de liaison automatique dans des machines a tricoter et machine incorporant ce dispositif

Country Status (6)

Country Link
EP (1) EP1834017A1 (fr)
JP (1) JP2008524454A (fr)
CN (1) CN101065525A (fr)
BR (1) BRPI0419256A (fr)
TW (1) TW200622051A (fr)
WO (1) WO2006064528A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008105006A1 (fr) * 2007-03-01 2008-09-04 Pilotelli Macchine Tessili S.R.L. Dispositif et procédé améliorés pour le remaillage automatique dans les machines à tricoter, et machine comprenant ledit dispositif
DE102009040739A1 (de) * 2009-09-08 2011-03-10 Sipra Patententwicklungs- Und Beteiligungsgesellschaft Mbh Verfahren und Strickmaschine zur Herstellung von Strickwaren mit Ringelmustern

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB227333A (en) * 1924-04-23 1925-01-15 Carlos Vallin Mechanical means for automatically effecting the stoppage of knitting machines
US1683586A (en) * 1927-01-03 1928-09-04 Mary M Maloney Knitting machine
US3494151A (en) * 1968-01-22 1970-02-10 Raalte Co Inc Van Suction operated yarn end clamping means for circular knitting machines

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006064528A1 *

Also Published As

Publication number Publication date
WO2006064528A1 (fr) 2006-06-22
TW200622051A (en) 2006-07-01
BRPI0419256A (pt) 2007-12-18
CN101065525A (zh) 2007-10-31
JP2008524454A (ja) 2008-07-10

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