EP1422331A1 - Remailleuse apte à fermer la couture point de chaínette pour éviter que la couture se défasse - Google Patents

Remailleuse apte à fermer la couture point de chaínette pour éviter que la couture se défasse Download PDF

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Publication number
EP1422331A1
EP1422331A1 EP03024503A EP03024503A EP1422331A1 EP 1422331 A1 EP1422331 A1 EP 1422331A1 EP 03024503 A EP03024503 A EP 03024503A EP 03024503 A EP03024503 A EP 03024503A EP 1422331 A1 EP1422331 A1 EP 1422331A1
Authority
EP
European Patent Office
Prior art keywords
needle
axis
point dial
machine according
point
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.)
Granted
Application number
EP03024503A
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German (de)
English (en)
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EP1422331B1 (fr
Inventor
Alessandro Peloggio
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.)
Electa Srl
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Exacta SpA
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B7/00—Linking machines, e.g. for joining knitted fabrics

Definitions

  • the present invention relates to a linking machine capable of locking the linking chain-stitch so as to prevent unraveling.
  • knitted portions are joined in the manufacture of items of clothing by sewing, which joins two flaps of knitted material regardless of the arrangement of the loops or stitches, or, if one seeks a qualitatively better result, by linking, which gradually joins one loop of one flap to a loop of the other flap of knitted material.
  • Linking is performed by using machines known indeed as linking machines.
  • the currently most widely used linking machines are circular linking machines, which are substantially composed of a frame that supports a point dial that has a vertical axis and is provided peripherally with a plurality of points that are orientated radially, with their tip directed outward, and are distributed uniformly around the axis of the point dial.
  • Each point is designed to support two loops or stitches respectively of one flap of knitted material and of the other flap of knitted material to be joined together.
  • the linking machine is provided with a needle, which by being inserted in the points in succession joins the pairs of loops fitted over the points.
  • the loops are joined by means of a sort of chain-stitched seam, formed by making the needle cooperate with auxiliary means, which can be constituted by a looper or a thread loading element, depending on the type of needle used, face the tip of the needle, and are arranged opposite thereto with respect to the point dial.
  • the needle is arranged inside the point dial and the auxiliary means are arranged externally, while in other kinds of machine the needle is arranged externally and the auxiliary means are arranged inside the point dial.
  • linking machines use a needle with an eye that carries the thread used to form the linking chain-stitch.
  • the auxiliary means are constituted by a looper that is designed to engage the eye of thread formed by the needle and retain it so that it is crossed by the needle while forming a subsequent stitch, indeed so as to form the chain-stitch.
  • auxiliary means are constituted by a thread loading element that feeds the thread to the needle, which draws it through two loops to be joined, forming an eye, and returns it toward the thread loading element after passing through two successive loops, so as to engage a new eye of thread, which is concatenated with the previous eye, which is released.
  • the chain-stitch used for linking owing to its very structure, if subjected to tension at its trailing end, i.e., the end formed last, unravels very easily.
  • the aim of the present invention is to solve the problem described above, providing a linking machine that is capable of performing, at the end of the linking process, a locking of the chain-stitch that effectively prevents its unraveling.
  • an object of the invention is to provide a linking machine in which the possibility to lock the chain-stitch does not penalize at all production potential, versatility and practicality of use.
  • Another object of the invention is to provide a method for locking the chain-stitch for linking knitted articles on linking machines so as to prevent unraveling.
  • a linking machine comprising a frame that supports, so that it can rotate about its own axis, a point dial that is provided peripherally with multiple points that are orientated radially and are distributed uniformly around the axis of said point dial; said frame supporting, proximate to a peripheral region of said point dial, a needle that can move on command along its own axis with an alternating motion that has a radial component with respect to said point dial in order to enter one of said points in each instance; auxiliary means being provided which cooperate with said needle in the forming of chain-stitches; means being further provided for actuating said point dial with a rotary motion about its own axis, for actuating said needle with an alternating translational motion along its own axis and for actuating said auxiliary means with a motion that is correlated to the motion of the needle in order to form a chain-stitch at each forward and return motion of the needle along its own axis;
  • the linking machine generally designated by the reference numeral 1, comprises a frame 2 and a point dial 3, which is provided peripherally with a plurality of points 4, which are orientated radially and are uniformly distributed around the vertical axis 3a of the point dial 3.
  • the point dial 3 is supported, so that it can rotate about its own axis 3a, by the frame 2.
  • the frame 2 Proximate to a peripheral region of the point dial 3, the frame 2 supports a needle 5, which can move on command along its own axis with an alternating motion that has a radial component, with respect to the point dial 3, so as to enter in each instance one of the points 4 that is aligned with the path of the needle 5.
  • the linking machine is provided with auxiliary means 6, which cooperate with the needle 5 in forming the chain stitches, and with actuation means, which actuate the point dial 3 with a rotary motion about its own axis 3a, actuate the needle 5 with an alternating translational motion along its own axis, and actuate the auxiliary means 6 with a motion that is correlated to the motion of the needle 5 in order to form a chain-stitch at each forward and return motion of the needle 5 along its own axis.
  • the linking machine comprises unraveling prevention means that are suitable to return or retain a same point 4 at the path of the needle 5 during the execution of at least two consecutive forward and return motions of the needle 5 along its own axis.
  • the point dial 3 is mounted on a rotatable structure 7, which is arranged around a main shaft 8, whose axis coincides with the axis 3a of the point dial 3.
  • Bearings 9 are interposed between the main shaft 8 and the rotatable structure 7 in order to allow the main shaft 8 to rotate, about its own axis, with respect to the rotatable structure 7 or vice versa.
  • the rotatable structure 7 is fixed to a pulley 10, whose axis coincides with the axis 3a; the pulley is supported, so that it can rotate about the same axis, by the frame 2 by way of the interposition of bearings 11.
  • the unraveling prevention means preferably comprise means for actuating the point dial 3 that are different from the actuation means of the needle 5 and of the auxiliary means 6.
  • the actuation means of the linking machine comprise first actuation means for the rotary actuation of the point dial 3 about its own axis 3a, and second actuation means for the actuation of the needle 5 with an alternating translational motion along its own axis and for the actuation of the auxiliary means 6.
  • the first actuation means comprise a first electric motor 12, which is preferably constituted by a step motor and is connected, by means of its output shaft, to a first transmission shaft 13, for example by means of a toothed belt drive 14.
  • the first transmission shaft 13 has a portion 13a that is shaped like a worm screw and mates with a helical gear 15 supported by a second transmission shaft 16.
  • a gear 17 is keyed on the second transmission shaft 16 and meshes with a ring gear 18 that is fixed coaxially to the point dial 3.
  • the first electric motor 12 is connected kinematically, by means of its output shaft, to the point dial 3.
  • the helical gear 15 can be fitted so that it can rotate on the second transmission shaft 16, and that it is possible to fit in a per se known manner between these two elements a coupling, generally designated by the reference numeral 19, which allows to connect or disconnect manually the helical gear 15 with respect to the second transmission shaft 16 and therefore to connect or disconnect the point dial 3 with respect to the first electric motor 12.
  • the second actuation means comprise a second electric motor 20, preferably constituted by a step motor, which is connected by means of its output shaft to the main shaft 8, for example by means of a toothed belt drive 21.
  • a gear 22 is keyed on the main shaft 8 and meshes with another gear 23 that is keyed on a third transmission shaft 24.
  • the third transmission shaft 24 has, at one of its axial ends, a crank 25 which is connected to the needle 5 by means of a linkage 26.
  • the linking machine in the illustrated embodiment, is constituted by a linking machine with a needle provided with an eye, which is supported inside the point dial 3, and the auxiliary means 6 are constituted by a looper 27, which is arranged outside the point dial 3.
  • the needle 5 is mounted on a needle supporting assembly 28, which can slide parallel to the axis of the needle 5 on a support 29, which is supported by the main shaft 8 so that it can rotate about the axis 3a.
  • the support 29, by utilizing its ability to oscillate about the axis 3a, is pulled by a spring 30 against a lever 31, which is supported, so that it can oscillate about an axis 31a that is parallel to the axis 3a, by the rotatable structure 7.
  • the lever 31 has a cam follower 32, which engages the profile of a cam 33 (shown only schematically) that is keyed onto the third transmission shaft 24 at its opposite end with respect to the crank 25.
  • the profile of the cam 33 as a consequence of the rotation of the third transmission shaft 24, produces an oscillation of the lever 31 about the axis 31a, causing an oscillation of the support 29 about the axis 3a.
  • the needle 5, once inserted in a point 4 is actuated not only with an axial motion but also with a motion that has a tangential component with respect to the point dial 3, so as to follow the point dial 3 and arrange itself, once extracted from a point 4, at the next point 4, which it must enter immediately thereafter.
  • the looper 27 is supported externally with respect to the point dial 3 by an arm 40, which is fixed to the rotatable structure 7 and is arranged opposite the needle 5 with respect to the point dial 3.
  • the looper 27 is actuated by the second electric motor 20 by being connected kinematically to the main shaft 8 by way of a known type of kinematic chain that comprises a toothed belt 34 and a fourth transmission shaft 35 and other transmission elements, which are not described in detail for the sake of simplicity.
  • the pulley 10 is connected, by two belts 36 and 37 and an additional shaft 38, to a rotating platform 39 of a known type, which is arranged at the base of the frame 2 and can be actuated, for example with one foot by the operator, in order to turn the rotatable structure 7.
  • the first electric motor 12 and the second electric motor 20 are connected to a control and actuation element 41 of the electronic type, which supervises the operation of the machine.
  • the control and actuation element 41 is programmable in order to synchronize the rotation rate of the output shaft of the first electric motor 12 with the rotation rate of the output shaft of the second electric motor 20 during normal linking and in order to allow a repeated actuation of the needle 5 at a same point 4, as will become better apparent hereinafter.
  • the first sensing means can be constituted by a sensor or photocell 42, which is supported by the rotatable structure 7 and faces a disk or cam 43, which is fixed to the main shaft 8.
  • a locator is arranged on the disk or cam 43, can be detected by the sensor or photocell 42, and is located at said sensor or photocell 42 when the needle 5 is disengaged from the points 4 of the point dial 3.
  • the first sensing means are connected to the control and actuation element 41.
  • the second sensing means can be constituted by an encoder which monitors, for example, the rotation of the transmission shaft 16 or of the transmission shaft 13 or directly of the point dial 3.
  • the second sensing means also are connected to the control and actuation element 41.
  • the article sensing means comprise a photocell 44, which is fitted externally with respect to the point dial 3, for example on the arm 40 or on another support that is rigidly coupled to the rotatable structure 7, and abuts against a reflector plate 45, which is arranged inside the point dial 3 and is supported by the rotatable structure 7 so that when the article fitted on the points 4 lies between the photocell 44 and the reflector plate 45 it interrupts the light beam emitted by the photocell 44.
  • the photocell 44 is arranged upstream of the work area of the needle 5 along the direction of rotation, indicated by the arrow 46, of the point dial 3 about its own axis 3a with respect to the needle 5.
  • the photocell 44 also is connected to the control and actuation element 41.
  • the articles to be looped are fitted on the points 4 of the point dial 3 in the usual manner, leaving free some points 4 between the end of one article and the beginning of the next article.
  • the electric motors 12 and 20 are then actuated with mutually synchronized speeds, so that the needle 5, in its forward and return motion along its own axis, enters in succession the points 4 that pass progressively in front of its tip, joining by linking the two flaps of the articles fitted on the points 4.
  • the rotation of the point dial 3 about its own axis 3 a gradually moves the end of the article being linked closer to the photocell 44.
  • the control and actuation element 41 acts on the electric motors 12 and 20, halting the operation of the needle 5, of the auxiliary means 6 and of the point dial 3 after the needle 5 has produced the last linking stitch by entering and exiting the last point 4 occupied by the article.
  • the needle 5 is stopped, by way of the detection of its position by the sensor or photocell 42, when it is disengaged from the points 4. However, this causes the next point 4 to be arranged, in the meantime, at the path of the needle 5.
  • the first motor 12 is actuated in reverse to the direction used in the preceding linking step, so that the last point 4 occupied by the article is returned to the preceding position, i.e., in alignment with the needle 5.
  • This step which locks the linking chain-stitch so as to prevent unraveling, can be repeated several times, returning the same point 4 each time at the needle 5.
  • chain-stitch locking stitches produced during this step are not true chain-stitches, since in order to form the chain-stitch it would be necessary to maintain the rotary motion of the point dial 3, but can be likened to knots that effectively prevent the unraveling of the linking chain-stitch.
  • the machine according to the invention can also lock the chain-stitch externally with respect to the article being linked, i.e., on the leading and/or trailing portion of the chain-stitch.
  • the point dial 3 can be simply kept motionless while the needle 5 forms the locking stitches, i.e., without the need to impart, at the end of the forming of each locking stitch, a retrograde motion to the point dial 3.
  • linking machine according to the invention and its operation have been described with reference to the embodiment shown in the drawings, which relates to a linking machine with a needle provided with an eye and arranged internally with respect to the point dial and with auxiliary means 6 constituted by a looper arranged externally with respect to the point dial; however, the concept on which the invention is based can be used on linking machines with a hooked needle arranged externally with respect to the point dial and the loooer arranged internally with respect to the point dial, or on linking machines with beak needle and auxiliary means constituted by a thread loading element that faces the needle and is arranged opposite thereto with respect to the point dial.
  • the linking machine according to the invention fully achieves the intended aim, since it is capable of locking the linking chain-stitch, once linking has been completed, so as to prevent its unraveling.
  • the materials used, as well as the dimensions, may be any according to the requirements and the state of the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Slide Fasteners, Snap Fasteners, And Hook Fasteners (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Surgical Instruments (AREA)
EP03024503A 2002-11-18 2003-10-24 Remailleuse apte à fermer la couture point de chaînette pour éviter que la couture se défasse Expired - Lifetime EP1422331B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI20022442 2002-11-18
IT002442A ITMI20022442A1 (it) 2002-11-18 2002-11-18 Macchina rimagliatrice in grado di operare il bloccaggio

Publications (2)

Publication Number Publication Date
EP1422331A1 true EP1422331A1 (fr) 2004-05-26
EP1422331B1 EP1422331B1 (fr) 2008-07-02

Family

ID=32211400

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03024503A Expired - Lifetime EP1422331B1 (fr) 2002-11-18 2003-10-24 Remailleuse apte à fermer la couture point de chaînette pour éviter que la couture se défasse

Country Status (4)

Country Link
EP (1) EP1422331B1 (fr)
AT (1) ATE399895T1 (fr)
DE (1) DE60321877D1 (fr)
IT (1) ITMI20022442A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103173940A (zh) * 2013-03-22 2013-06-26 王虎 半自动套口机
CN103173939A (zh) * 2013-03-22 2013-06-26 王虎 一种半自动套口机
CN103437063A (zh) * 2013-08-23 2013-12-11 东莞市缝神机械有限公司 一种可调变速的缝盘机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1240037A (en) * 1968-01-22 1971-07-21 Complett Spa Looper for linking machines and sewing machines
US5487281A (en) * 1993-07-12 1996-01-30 Fabritex S.R.L. Method and apparatus for joining two edges of a knitted tubular article
EP0897030A2 (fr) * 1997-08-12 1999-02-17 Pegasus Sewing Machine Mfg. Co., Ltd. Procédé et dispositif pour éviter qu'une couture se défait dans une machine à coudre à point de chaínette double
US5881663A (en) * 1995-10-09 1999-03-16 Juki Corporation Method of tying a knot in chain stitching
US6422165B1 (en) * 1999-11-09 2002-07-23 Yamato Mishin Seizo Kabushiki Kaisha Apparatus for preventing raveling of seam

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1240037A (en) * 1968-01-22 1971-07-21 Complett Spa Looper for linking machines and sewing machines
US5487281A (en) * 1993-07-12 1996-01-30 Fabritex S.R.L. Method and apparatus for joining two edges of a knitted tubular article
US5881663A (en) * 1995-10-09 1999-03-16 Juki Corporation Method of tying a knot in chain stitching
EP0897030A2 (fr) * 1997-08-12 1999-02-17 Pegasus Sewing Machine Mfg. Co., Ltd. Procédé et dispositif pour éviter qu'une couture se défait dans une machine à coudre à point de chaínette double
US6422165B1 (en) * 1999-11-09 2002-07-23 Yamato Mishin Seizo Kabushiki Kaisha Apparatus for preventing raveling of seam

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103173940A (zh) * 2013-03-22 2013-06-26 王虎 半自动套口机
CN103173939A (zh) * 2013-03-22 2013-06-26 王虎 一种半自动套口机
CN103173939B (zh) * 2013-03-22 2015-08-05 绍兴丰源节能科技有限公司 一种半自动套口机
CN103437063A (zh) * 2013-08-23 2013-12-11 东莞市缝神机械有限公司 一种可调变速的缝盘机
CN103437063B (zh) * 2013-08-23 2015-12-23 东莞市缝神机械有限公司 一种可调变速的缝盘机

Also Published As

Publication number Publication date
ITMI20022442A1 (it) 2004-05-19
DE60321877D1 (de) 2008-08-14
EP1422331B1 (fr) 2008-07-02
ATE399895T1 (de) 2008-07-15

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