EP0803600A2 - Verfahren und Vorrichtung zum Ermitteln von der Bedingung für erfolglose Bildung von einer oder mehreren Maschen in einer Textilmaschine - Google Patents

Verfahren und Vorrichtung zum Ermitteln von der Bedingung für erfolglose Bildung von einer oder mehreren Maschen in einer Textilmaschine Download PDF

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Publication number
EP0803600A2
EP0803600A2 EP97830171A EP97830171A EP0803600A2 EP 0803600 A2 EP0803600 A2 EP 0803600A2 EP 97830171 A EP97830171 A EP 97830171A EP 97830171 A EP97830171 A EP 97830171A EP 0803600 A2 EP0803600 A2 EP 0803600A2
Authority
EP
European Patent Office
Prior art keywords
formation
stitch
thread
needles
needle
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Withdrawn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
EP97830171A
Other languages
English (en)
French (fr)
Other versions
EP0803600A3 (de
Inventor
Stefano Paoletti
Leonardo Lenzi
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.)
Vogue SRL
Original Assignee
Vogue 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 Vogue SRL filed Critical Vogue SRL
Publication of EP0803600A2 publication Critical patent/EP0803600A2/de
Publication of EP0803600A3 publication Critical patent/EP0803600A3/de
Withdrawn legal-status Critical Current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
    • D04B15/10—Needle beds
    • 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 refers to a safe method and apparatus for textile machines, especially for detecting the condition of unsuccessful formation of a stitch.
  • the main object of the present invention is to overcome the said drawback. This result has been achieved, according to the invention, by providing a method and apparatus having the features indicated in the claims 1 and 3. Further characteristics being set forth in the dependent claims.
  • the advantages deriving from the present invention lie essentially in that it is possible to detect, in real time and with the greatest operating accuracy, the state of operation of each active point of the needles front, and to automatically and timely cut off the production in case of failure, by one or more needles intended for the formation of the stitches, to pick up the thread; that an apparatus according to the invention is relatively easy to make, cost-effective and reliable even after a prolonged service life, and also able to be constructed in more separate modules so as to facilitate its manufacturing, storage, transport, assembly and any maintenance as required.
  • FIG. 1 shows schematically a scrap view of an apparatus according to the invention and mounted on the needles front of a rectilinear knitting machine
  • Fig. 2A is a detail of the apparatus of Fig. 1 showing the advancement of a needle of the front
  • Fig. 2B is the detail of Fig. 2A showing the needle in its retracted position and the thread being picked up
  • Fig. 2C is the detail of Fig. 2A showing the retracted needle and the unsuccessful formation of the stitch due to the breaking of the thread
  • Fig. 1 shows schematically a scrap view of an apparatus according to the invention and mounted on the needles front of a rectilinear knitting machine
  • Fig. 2A is a detail of the apparatus of Fig. 1 showing the advancement of a needle of the front
  • Fig. 2B is the detail of Fig. 2A showing the needle in its retracted position and the thread being picked up
  • Fig. 2C is the detail of Fig. 2A showing the retracted needle and the unsuccessful formation of
  • FIG. 3A shows the apparatus of Fig. 1 according to a possible embodiment
  • Fig. 3B shows a detail of the apparatus of Fig. 3A
  • Fig. 4 shows the apparatus of Fig. 1 according to a further embodiment
  • Fig. 5A is a detail of the apparatus of Fig. 4 showing the advancement of a needle of the front
  • Fig. 5B is the detail of Fig. 5A showing the needle in its retracted position and the thread being picked up
  • Fig. 5C is the detail of Fig. 5A showing the retracted needle and the unsuccessful formation of the stitch due to the breaking of the thread
  • Fig. 6 shows the apparatus of Fig. 1 according to a further alternative embodiment
  • Fig. 7A is a detail of the apparatus of Fig.
  • Fig. 7B is the detail of Fig. 7A showing the needle in its retracted position and the thread being picked up
  • Fig. 7C is the detail of Fig. 5A showing the retracted needle and the unsuccessful formation of the stitch due to the breaking of the thread
  • Fig. 7D shows a detail in enlarged scale of the apparatus of Fig. 6
  • Fig. 8 shows a cutaway perpsective view of an apparatus according to the invention and mounted on a circular knitting machine
  • Fig. 9 shows the detail of Fig. 2A according to an alternative embodiment
  • Fig. 10 shows the detail of Fig. 5A according to an alternative embodiment
  • Fig. 11 shows the detail of Fig. 7A according to an alternative embodiment
  • Fig. 12 shows a simplified block diagram of the means for controlling a textile machine provided with an appartatus according to the invention.
  • a method for detecting the condition of unsuccessful formation of a stitch by one or more needles (8) of a textile machine with a plurality of needles (1) received in corresponding slots (5) of a front (3) whose trailing edge (30) faces the region for supplying the thread (1) for the formation of the stitches comprises the following operative steps:
  • the selection and movement of the needles (8) intended to form the stitches, and the supply of the needles (1) as well, are operations performed by the use of electronic means and, therefore, will not be described herein in detail.
  • the selection of the needles (1) may be carried out by means of jacks operating from the back of the needles, according to a technique known per se, and the movement of the needles in a programmed sequence related to the very characteristics of the product to be obtained, may be carried out by cam means - not shown - acting on heels (80) of the same needles (8) .
  • the apparatus for implementing the above method comprises in correspondence of each needle (8) of the front (3), a detector (7) able to sense the pressure exerted by the thread (1) of the relevant needle (8) disposed for the formation of a stitch: said detector (7) being electrically coupled with means (M) for controlling the needles (8) and cause make them to stop when the pressure exerted by the thread (1) at a preset point of the machine, and with the relevant needle (8) being disposed for the formation a stitch, is less than a preset value.
  • each of said detectors (7) is positioned on the trailing edge (30) of the said front (3) on the opposite side of the needle (8) with respect to the thread (1), so that the thread (1), being disposed for the formation of the respective stitch, will result interposed between the needle (8) and the detector (7).
  • each detector (7) is located beneath the axis of longitudinal motion of the relevant needle (8). In case of circular fronts of vertical needles (8), each detector (7) is in a centripetal position with respect to the corresponding needle (8).
  • each of said detectors (7) consists of an electric or electromagnetic spring button: said spring (70) being of spiral type with orthogonal or oblique axis with respect to the direction of motion of the needles (8) or of lamina type oriented according to a direction substantially parallel to that in which the needles (8) move, so that said button will result in lowered position during the formation of a stitch by the corresponding needle (8) and in lifted position in case of failure to form the stitch, thereby causing the closing, respectively the opening of the relevant contacts suitably associated to the means (M) for the control of the needles (8) in order to cause the latter to stop in case of a lifting of the button.
  • said spring (70) being of spiral type with orthogonal or oblique axis with respect to the direction of motion of the needles (8) or of lamina type oriented according to a direction substantially parallel to that in which the needles (8) move, so that said button will result in lowered position during the formation of a stitch by the corresponding needle (8) and in lifted position
  • said button (7) is engaged to elastic means (70) acting in a direction at an angle to the axis of motion of the corresponding needle (8) and being normally in lifted up position, with its upper end at a level lower than that of said needle (8) in order to not interfere with its movement, and in lowered position, during the formation of a stitch, as determined by the load exerted thereon by the corresponding portion of the thread (1).
  • the stopping of the needles (1) by the means (M) is operated when the button (7) remains in lifted condition also after the retraction of the corresponding needle (8) disposed for the formation of the respective stitch.
  • Such a condition actually corresponds to the unsuccessful formation of the stitch.
  • Advantageously associated to said button (7) are two corresponding side legs (2) which allow for a better guide of the thread (1).
  • the spring (70) is suitably gauged in relation to the pressure normally exerted by the thread (1) during the formation of a stitch.
  • Each of said detectors (7) is able to be positioned in a corresponding seat of the front (3) of needles (8) or within a box-like case (6) capable of holding a predetermined number thereof.
  • the application of the present apparatus to existing machines can be simply made by disassembling the front (3) of the needles (8) and forming on its trailing edge (30) the seats for the detectors (7) and the passages for the leads connecting the respective contacts to the means (M) for the control of the needles (8), while the application of the same apparatus to recently manufactured machines, the trailing edge (30) of the front (3) may be directly provided with said seats.
  • the said plate (9) may have such a length as to allow it to be housed in a container (6) of the type above mentioned, so as to make it an integral part thereof (see Figs. 9-11): the contacts (900) of said plate (9) being coupled via the cable (90) to the means (M) for the control of the needles (8) through corresponding leads (92) whose common terminal connector (93) is integral and external to the container (6).
  • the trailing edge (30) of the front (3) are vertical legs (4) projecting sideway of the slots for the guide of the needles (8) in order to better guide the thread (1) in correspondence of each needle (8).

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Treatment Of Fiber Materials (AREA)
EP97830171A 1996-04-26 1997-04-14 Verfahren und Vorrichtung zum Ermitteln von der Bedingung für erfolglose Bildung von einer oder mehreren Maschen in einer Textilmaschine Withdrawn EP0803600A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITFI960085 1996-04-26
IT96FI000085A IT1286602B1 (it) 1996-04-26 1996-04-26 Metodo e dispositivo per rilevare la condizione di mancata formazione di una o piu' maglie in macchina tessile

Publications (2)

Publication Number Publication Date
EP0803600A2 true EP0803600A2 (de) 1997-10-29
EP0803600A3 EP0803600A3 (de) 1998-12-02

Family

ID=11351605

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97830171A Withdrawn EP0803600A3 (de) 1996-04-26 1997-04-14 Verfahren und Vorrichtung zum Ermitteln von der Bedingung für erfolglose Bildung von einer oder mehreren Maschen in einer Textilmaschine

Country Status (2)

Country Link
EP (1) EP0803600A3 (de)
IT (1) IT1286602B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104404711A (zh) * 2014-11-27 2015-03-11 常州驰网智能检测技术有限公司 布面疵点检测装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2346545A1 (de) * 1973-09-15 1975-03-20 Norbert Wille Fadenkamm-ueberwachungsanlage
DE2528277A1 (de) * 1975-06-25 1977-01-13 Gustav Memminger Vorrichtung zum abstellen von garnverarbeitenden textilmaschinen
DE2739923A1 (de) * 1976-09-06 1978-03-09 Iija Sisko Dr Pietikaeinen Verfahren und vorrichtung zum messen der waehrend eines strick- oder wirkvorgangs auf einen nadelkopf wirkenden kraefte
GB2022150A (en) * 1978-05-31 1979-12-12 Meiners Electronic Controls Lt Improvements in and relating to the detection of flaws, breakages discontinuities and the like

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2346545A1 (de) * 1973-09-15 1975-03-20 Norbert Wille Fadenkamm-ueberwachungsanlage
DE2528277A1 (de) * 1975-06-25 1977-01-13 Gustav Memminger Vorrichtung zum abstellen von garnverarbeitenden textilmaschinen
DE2739923A1 (de) * 1976-09-06 1978-03-09 Iija Sisko Dr Pietikaeinen Verfahren und vorrichtung zum messen der waehrend eines strick- oder wirkvorgangs auf einen nadelkopf wirkenden kraefte
GB2022150A (en) * 1978-05-31 1979-12-12 Meiners Electronic Controls Lt Improvements in and relating to the detection of flaws, breakages discontinuities and the like

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104404711A (zh) * 2014-11-27 2015-03-11 常州驰网智能检测技术有限公司 布面疵点检测装置

Also Published As

Publication number Publication date
ITFI960085A0 (it) 1996-04-26
EP0803600A3 (de) 1998-12-02
IT1286602B1 (it) 1998-07-15
ITFI960085A1 (it) 1997-10-26

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