EP2206819B1 - Dispositif à couper le fil pour une machine à coudre - Google Patents

Dispositif à couper le fil pour une machine à coudre Download PDF

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Publication number
EP2206819B1
EP2206819B1 EP09177459A EP09177459A EP2206819B1 EP 2206819 B1 EP2206819 B1 EP 2206819B1 EP 09177459 A EP09177459 A EP 09177459A EP 09177459 A EP09177459 A EP 09177459A EP 2206819 B1 EP2206819 B1 EP 2206819B1
Authority
EP
European Patent Office
Prior art keywords
knife
thread
cutting
thread cutting
counter
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.)
Active
Application number
EP09177459A
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German (de)
English (en)
Other versions
EP2206819A1 (fr
Inventor
Samuel Römich
Thomas Nöltge
Tomás Frolec
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.)
Duerkopp Adler AG
Original Assignee
Duerkopp Adler AG
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 Duerkopp Adler AG filed Critical Duerkopp Adler AG
Publication of EP2206819A1 publication Critical patent/EP2206819A1/fr
Application granted granted Critical
Publication of EP2206819B1 publication Critical patent/EP2206819B1/fr
Active legal-status Critical Current
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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B37/00—Devices incorporated in sewing machines for slitting, grooving, or cutting
    • D05B37/04—Cutting devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D05B65/02—Devices for severing the needle or lower thread controlled by the sewing mechanisms

Definitions

  • the invention relates to a thread cutting device for a sewing machine according to the preamble of claim 1. Furthermore, the invention relates to a sewing machine with such a thread cutting device.
  • a thread cutting device of the type mentioned is known by public prior use.
  • Other thread cutting devices are known from the DE 92 11 820 U1 , of the DE 10 2007 045 599 A1 and from a company publication Dürkopp Adler AG: 767 Special Sewing Machine, Service Manual, Edition 10/2008.
  • a design of the spacer wall section according to claim 2 ensures that there is not undesirable contact with the counter blade.
  • a displaceable counter knife according to claim 4 allows a simple cutting force adjustment.
  • a thread-pulling knife according to claim 8 has proven itself in practice.
  • the thread cutting device can be used to cut at least one upper thread and / or used for cutting at least one lower thread of the sewing machine.
  • the advantages of a sewing machine according to claim 9 correspond to those which have already been explained above with reference to the thread cutting device according to the invention.
  • the sewing machine may be a one-needle sewing machine, a two-needle sewing machine, or a multi-needle sewing machine having a larger number of needles.
  • two-needle sewing machine 1 has an upper arm 2, a vertical stand 3 and a lower housing in the form of a base plate 4.
  • an arm shaft is rotatably mounted, the Armwellenachse 5 in the FIGS. 14 and 16 is drawn.
  • the arm shaft axis 5 results as the intersection of two auxiliary lines 5a and 5b.
  • a needle plate 14 is arranged in an upper support plate 13 of the base plate 4 and screwed to the support plate 13.
  • the throat plate 14 is in the Figures 60 and 61 shown in more detail.
  • the throat plate 14 has two along a sewing direction 15 (see Figures 2 and 61 ) longitudinally extending feed dog openings 16, 17, which serve for the passage of a feed of the material to be conveyed feed gate with two feed valves sections 18, 19.
  • the feed dog sections 18, 19 each have a tap hole 20, 21 for the passage of the respective associated needle 11, 12th
  • a gripper assembly 24 is arranged in the base plate 4, the total and with widely spaced grippers 25, 26 in the FIG. 25 is shown.
  • a distance variation between the grippers 25, 26 and thus between the stitched with the needles 11, 12 and the associated grippers 25, 26 seams is possible in the sewing machine 1 in the range between a few and a few tens of millimeters.
  • the gripper tips 27 of the grippers 25, 26 act in concert with the movement of the needles 11, 12 in order to form a stitch, whereby a loop of an upper thread, not shown, into which the gripper tips 27 engage, is formed by the movement of the needle.
  • the two upper threads are provided by coils, not shown in the drawing and a needle thread tensioning device 29 (see FIGS. 1 and 2 ), which is mounted on a mounting plate of the arm 2, defined and adjustable tensioned.
  • a thread cutter assembly 34 in total in the FIG. 36 is shown and of the in the FIGS. 1 and 2 a cutting cam 35 is visible, which via a solenoid 36 for actuating a thread-pulling knife 37 (see FIG. 36 ) is switchable.
  • the cutting cam 35 is rotatably connected to the lower shaft 31.
  • a needle transport device 55 To move the needle bars 9, 10 during a stitch along the sewing direction or transport direction 15, ie for needle transport, is a needle transport device 55, the needle bar side components, for example, in the FIGS. 3 and 5 are shown.
  • the needle transport is carried out by pivoting a needle bar support 56 in the form of the two needle bars 9, 10 outside leading backdrop about a pivot axis 57.
  • the pivot axis 57 is parallel to the support plate 13.
  • the pivot axis 57 is from the switching cam 40 by more than 10 mm, in the illustrated embodiment by several cm, spaced.
  • the pivoting about the pivot axis 57 is driven via a along this pivot axis 57 extending thrust shaft 58.
  • a needle bar side end of the thrust shaft 58 is rotatably connected to the guide slot 56.
  • the latter has an upper guide portion 59 which is connected to a lower guide portion 60.
  • the latter is in turn rotatably connected via an actuating arm 61 with the thrust shaft
  • the switching cam 40 is pivotally mounted about a pivot axis 57 parallel to the switching cam pivot axis 62 on a housing-fixed switching cam carrier 63.
  • the engaging lever 50 cooperates with the switching cam 40 via a driver 64 which is fixedly connected to the engaging lever 50, and an actuating groove 65 formed in the switching cam 40. In this way, a safe actuation adhesion between the engaging lever 50 and the switching cam 40 is independent of the pivotal position of the switching cam 40 to the switching cam pivot axis 62 guaranteed.
  • the engagement lever 50 is connected to the shift linkage 49 via a return spring 66 (see, for example FIG. 7 ).
  • the return spring 66 ensures that the switching cam 40 at a lateral impact of this on one of the switching pins 41 each to be switched needle bar 9, 10 an actuating movement in the direction of this switching pin 41 to dodge so long against the bias of the return spring 66 until this switching pin 41 by a sewing movement of the respective needle bar 9, 10 has moved far enough for the displacement of the switching cam 40 in the switching position on the switching pin 41 down.
  • the upper rest stop 75 is predetermined by the upper edge of the respective stop ring 68.
  • a distance adjustment 76 which is designed as an eccentric adjustment, which in detail in the FIG. 15 is shown.
  • the pivot axis 57 of the thrust shaft 58 located in the FIG. 15 as an intersection of two auxiliary lines 57a, 57b, is an eccentricity E horizontally from a horizontal position of the arm shaft axis 5 (see auxiliary line 5a in the FIG. 15 ) spaced.
  • E the eccentricity E
  • This distance is minimally greater than the thickness of the stop rings 68 in the axial direction along the needle bar 9, 10.
  • the eccentricity E is 0.2 mm, that is less than 1 mm.
  • FIGS. 20 to 22 show a neutral position of the lever connection 77, in which the needle conveyor 55 is out of force, ie in which no needle transport takes place.
  • the pull rod 81 exerts no drive effect on the needle transport lever 83, so that it remains in spite of the pendulum movement 84 of the driving lever 78 at rest.
  • the needle feed lever 83 is screwed tightly to a frame component 85a of the sewing machine 1 via the hinge screw 82.
  • the gripper assembly 24 is explained below, to which in addition to the two grippers 25, 26 still belongs a gripper drive assembly.
  • the two grippers 25, 26 are each supported by a gripper block 90, 91.
  • the gripper block 90 thereby belongs to the gripper 25 and to the needle bar 9 and constitutes part of the gripper drive housing 32.
  • the gripper block 91 belongs to the gripper 26 and to the needle bar 10 and constitutes part of the gripper drive housing 33.
  • FIGS. 26 to 35 show the lower shaft 31 with the components attached thereto in the region of the gripper block 90.
  • a corresponding, rotated by 180 ° about a vertical axis symmetrical thereto formed arrangement is in the range of the gripper block 91 before.
  • the two gripper blocks 90, 91 are spaced from each other fixed to the lower shaft 31, which rotates synchronously with the movement of the needles 11, 12, that is, synchronously with the arm shaft.
  • a clamping threaded pin 95 which is screwed radially through a respective hollow shaft portion 92, 93 surrounding adjusting sleeve 96.
  • the adjusting sleeve 96 has for this purpose a radial internal thread which is designed to be complementary to an external thread of the threaded pin 95.
  • one of the two adjusting sleeves 96 is assigned to one of the two gripper blocks 90, 91 and fixed thereto.
  • the clamping surface 97 abuts against a mating surface 99 complementary to this, which is embodied, for example, as a plane milling in a jacket wall 100 of the lower shaft 31.
  • the mating surface 99 may also be formed, for example, as a V-groove.
  • the counter surface 99 is not rotationally symmetrical to the axis of rotation 98a of the lower shaft 31 executed.
  • FIGS. 32 and 33 For Schleifenhub adjustment can, as in the FIGS. 32 and 33 shown, the respective hollow shaft portion 92 about the rotation axis 98a, starting from a central position to FIG. 31 be adjusted.
  • FIG. 32 shows such an adjustment by a circumferential angle V in a first circumferential direction
  • FIG. 33 a counter-adjustment by the same amount V in the circumferential direction opposite.
  • a synchronization of the hook tip 27 to the loop stroke position of the associated needle bar 9, 10 can be changed and thus adjusted.
  • the lower shaft 31 is mounted in each case via a bearing 108.
  • FIGS. 36 to 59 show the thread trimmer assembly 34 completely or in subassemblies.
  • a cutting movement of the thread pulling knife 37 is in the activated position of the solenoid 36 by rolling a follower body 109 on a cutting curve 110 of the cutting cam 35 causes.
  • the follower body 109 is connected via a transmission member 111 on the one hand with a lifting ram 112 of the solenoid 36 and on the other hand with the thread-pulling knife 37 in operative connection (see FIG. 36 ).
  • the transmission member 111 is mounted fixed to the housing so that it can perform a rotational movement about a shaft portion 113 of the transmission member 111.
  • a thread cutting device 114 of the thread trimmer assembly 34 is in addition to the thread-pulling knife 37, which is a movable thread cutting knife, a fixed over the respective gripper block 90, 91 fixed to the frame of the sewing machine 1 counter knife 115th
  • the Figures 39 and 40 show the thread cutting device 114 immediately after thread cutting.
  • a cutting edge 116 of the thread pulling knife 37 cooperates with the thread cutting kit a counter edge 117 of the counter knife 115 together.
  • the cutting edge 116 is bounded on the one hand by a catching groove 118 of the thread-pulling knife 37 and on the other hand by a cutting wall section 119 of an upper thread-pulling knife wall 119a of the thread-pulling knife 37, which corresponds to a plane of movement 120 (cf. FIG. 40 ) of the thread pulling knife 37 coincides with the cutting movement thereof.
  • an adjustment area 123 adjacent to the cutting edge 116 is provided on the spacer wall section 121 . This one is in the FIG. 50 indicated by two vertical short boundary lines, which extend from the distance wall portion 121 downward.
  • a distance B of the adjustment portion 123 from the cutting edge 116 is dimensioned so that a correct cutting force, ie a correct cutting pressure exerted by the thread-pulling knife 37 against the counter blade 115 during thread cutting at the cutting edge 116, then exists when the thread-pulling knife 37 force-free in the adjustment 123, ie without pressure on the counter knife 115th is applied.
  • the adjustment portion 123 is marked on the upper thread-pulling knife wall 119a by a laser mark.
  • a correct cutting pressure for the thread cutting builds up due to an overlap C (cf. FIG. 50 ) between a height of the opposite edge 117 in the adjustment region 123 and a height of the cutting edge 116.
  • the counter blade 115 For cutting force adjustment is the counter blade 115 between counter blade positions with different distances of the opposite edge 117 to the movement plane 120, ie with different overlaps C, displaced.
  • the counter knife 115 is displaceable about a pivot joint 124 with pivot axis 125 between different pivot positions and for fixing a predetermined cutting force via a locking screw 126, that is, via a cutting force adjusting screw, fixed.
  • the Locking screw 126 also serves to fix the counter blade 115 on a counter blade carrier 127 and thus on the respective gripper block 90, 91 on the frame of the sewing machine 1.
  • the pivot joint 124 has a propeller shaft with joint axis 129. At this counter-blade 115 is fixed by a fastening screw 130.
  • the hollow grinding of the spacer wall section 121 leads to a smooth running of the first movement section of the thread pulling knife 37 during the cutting movement.
  • An adjustment member 134 for example, in the FIG. 55 is used to adjust a clamping pressure of the thread clamp 131 against the thread-pulling knife 37.
  • the adjusting member 134 is displaced and acts between the two spring ends 132, 133 an adjustable pressure on the thread clamp 131 from.
  • the adjusting member 134 is formed as screwed into the counter blade carrier 127 and self-locking running adjustment screw.
  • the adjusting screw 134 In the position after the FIGS. 53 to 55 the adjusting screw 134 is set in a neutral position and is not engaged with the thread clamp 131. In this position, the clamping end 133 of the thread clamp 131 is under slight thread tension on the thread-pulling knife 37, as far as the latter is present in the position after the thread cutting.
  • Figures 56 to 59 show the adjusting member 134 in engagement with the thread clamp 131.
  • the thread clamp 131 is lifted between the holding spring end 132 and the clamping end 133 due to the action of the adjusting member 134 of a support wall 135 of the counter knife support 127, so that the clamping end 133 stronger presses against the thread-pulling knife 37, as far as the latter is present in the position after thread trimming.
  • this bias between the clamping end 133 and the thread-pulling knife 37 can be adjusted. This setting can be made in the clamping position of the thread clamp 131 relative to the thread-pulling knife 37.
  • FIGS. 60 to 66 show details of the support plate 13 in the throat plate 14.
  • the throat plate 14 is fixed to the support plate 13 and thus to the base plate 4.
  • An upper side of the throat plate 14 is aligned with an upper side of the surrounding support plate 13.
  • the two needle plate slides 136, 137 are secured against relative displacement of the needle plate slides 136, 137 relative to the support plate 13 and thus relative to the base plate 4.
  • the securing device 138 will be described below in connection with that in the FIG. 61 right stitch plate slider 137 explained. Point symmetrical about a center between the two tap holes 20, 21 arranged for this purpose is the securing device 138 for in the FIG. 61 left needle plate slide 136.
  • the securing position of the securing device 138 is a displacement of the needle plate slide 137 in a direction of movement 143, ie away from the throat plate 14, not possible.
  • the needle plate slide 137 is thus against a relative displacement the needle plate slide 137 relative to the support plate 13 and thus secured to the base plate 4.
  • the release device 144 is executed by a release button, which is accessible from the top of the support plate 13 and thus from the top of the base plate 4 ago and cooperates with the locking lug 139. This interaction takes place indirectly by applying pressure via the release button 144 in the FIG. 63 from above via an actuating plunger 145, the clamping plate 142 and thus also the leaf spring 140 with the locking lug 139 down to the release position FIG. 64 is relocated. After reaching the release position of the needle plate slide 137 can be moved together with the release button 144 in the direction of movement 143 relative to the support plate 13 and thus away from the throat plate 14 away.
  • a guide device 146 is formed by a guide groove 147 in the support plate 13 and thus in the base plate 4, in which a spring 148, which is part of the leaf spring 140, engages. Due to the spring action of the leaf spring 140 in the guide device 146 can be adjusted relative to the top of the platen 13 by means of adjusting screws an aligned position of the top of the needle plate slide 137.
  • the clamping plate 142 is screwed to the needle plate slide 137 via fastening screws 153.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Claims (9)

  1. Dispositif à couper le fil (114) pour une machine à coudre (1), comprenant
    - une lame pour couper le fil (37) mobile,
    - une lame antagoniste (115) pouvant être fixée sur un cadre de machine à coudre (4),
    - un bord coupant (116) de la lame pour couper le fil (37) qui coagit lors de la coupe du fil avec un bord antagoniste (117) de la lame antagoniste (115) étant délimité par une section de paroi de coupe (119) d'une paroi supérieure (119a) de la lame pour couper le fil (37) qui coïncide avec un plan de déplacement (120) de la lame pour couper le fil (37) lors de son mouvement de coupe,
    caractérisé en ce que
    la paroi supérieure (119a) de la lame pour couper le fil passe au-delà du bord coupant (116) dans une section de paroi d'écartement (121) espacée du plan de déplacement (120) de sorte que lors de la coupe du fil, la lame pour couper le fil (37) n'entre en contact avec la lame antagoniste (115) que de manière contiguë au bord coupant (116).
  2. Dispositif à couper le fil selon la revendication 1, caractérisé en ce que la distance (A) de la section de paroi d'écartement (121) par rapport au plan de déplacement (120) augmente de manière strictement monotone avec la distance croissante par rapport au bord coupant (116).
  3. Dispositif à couper le fil selon la revendication 1 ou 2, caractérisé en ce qu'une zone de réglage (123) contiguë au bord coupant (116) est prévue sur la section de paroi d'écartement (121), dans laquelle zone la lame antagoniste (115) repose sans force sur la lame pour couper le fil (37) pour le réglage d'une force de coupe.
  4. Dispositif à couper le fil selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la lame antagoniste (115) peut être déplacée pour le réglage de la force de coupe entre des positions de lame antagoniste à une distance différente de la lame antagoniste (115) par rapport au plan de déplacement (120).
  5. Dispositif à couper le fil selon la revendication 4, caractérisé en ce que la lame antagoniste (115) peut être déplacée autour d'une articulation pivotante (124) entre différentes positions de pivotement.
  6. Dispositif à couper le fil selon la revendication 5, caractérisé en ce qu'une vis de blocage (126) destinée à la fixation de l'articulation pivotante (124) sert en même temps à fixer la lame antagoniste (115) sur le cadre de machine à coudre (4).
  7. Dispositif à couper le fil selon l'une quelconque des revendications 1 à 6, caractérisé en ce qu'une vis de blocage (126) destinée à la fixation de l'articulation pivotante (124) sert en même temps à la prescription d'une position relative axiale de la lame antagoniste (115) le long d'un axe de pivotement (125) de l'articulation pivotante (124).
  8. Dispositif à couper le fil selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la lame pour couper le fil (37) est réalisée comme une lame tireuse de fil.
  9. Machine à coudre dotée d'un dispositif à couper le fil (114) selon l'une quelconque des revendications 1 à 8.
EP09177459A 2009-01-09 2009-11-30 Dispositif à couper le fil pour une machine à coudre Active EP2206819B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009004218A DE102009004218A1 (de) 2009-01-09 2009-01-09 Fadenschneidvorrichtung für eine Nähmaschine

Publications (2)

Publication Number Publication Date
EP2206819A1 EP2206819A1 (fr) 2010-07-14
EP2206819B1 true EP2206819B1 (fr) 2011-05-18

Family

ID=42131666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09177459A Active EP2206819B1 (fr) 2009-01-09 2009-11-30 Dispositif à couper le fil pour une machine à coudre

Country Status (6)

Country Link
EP (1) EP2206819B1 (fr)
KR (1) KR20100082721A (fr)
CN (1) CN101775715B (fr)
AT (1) ATE510059T1 (fr)
DE (1) DE102009004218A1 (fr)
TW (1) TWI463052B (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012205049A1 (de) * 2012-03-29 2013-10-02 Dürkopp Adler AG Faden-Schneid-Baugruppe für eine Schnürloch-Nähmaschine
CN103103700B (zh) * 2013-02-06 2015-05-20 中山百川汇盈精密实业有限公司 一种剪线切带装置
DE102015207758A1 (de) 2015-04-28 2016-11-03 Dürkopp Adler AG Nähanlage sowie Betriebsverfahren hierfür
DE202015102109U1 (de) 2015-04-28 2016-08-01 Dürkopp Adler AG Nähanlage
DE102017207627A1 (de) * 2017-05-05 2018-11-08 Dürkopp Adler AG Baugruppe zum Erzeugen eines Naht-Anfangsoberfadens mit einem Soll-Nahtüberstand
CN108893887B (zh) * 2018-07-24 2023-11-24 浙江川田智能科技有限公司 一种缝纫机的面线脱离机构的安装结构
DE202019102567U1 (de) * 2019-05-08 2020-08-11 Dürkopp Adler AG Nähmaschine sowie Gegenmesser-Baugruppe für eine Maschine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE955023C (de) 1955-08-25 1956-12-27 Duerkoppwerke Ag Mehrnadelnaehmaschine, insbesondere Zweindelnaehmaschine, mit einer Einrichtung zum wahlweisen Ein- und Ausschalten der Nadelstangen
JPH0875Y2 (ja) * 1991-09-13 1996-01-10 ジューキ株式会社 ミシンの糸切断装置
DE4436613C1 (de) * 1994-10-13 1996-03-07 Duerkopp Adler Ag Fadenabschneidvorrichtung
DE202006009410U1 (de) * 2006-04-21 2007-08-30 Dürkopp Adler AG Fadenziehmesser für eine Nähmaschine
JP2008068001A (ja) * 2006-09-15 2008-03-27 Juki Corp ミシン
DE202009000251U1 (de) * 2009-01-09 2009-04-09 Dürkopp Adler AG Nähmaschine
TWM365364U (en) * 2009-03-12 2009-09-21 Chee Siang Ind Co Ltd Automatic thread-cutting device of sewing machine

Also Published As

Publication number Publication date
EP2206819A1 (fr) 2010-07-14
TW201033432A (en) 2010-09-16
CN101775715A (zh) 2010-07-14
ATE510059T1 (de) 2011-06-15
CN101775715B (zh) 2013-01-09
KR20100082721A (ko) 2010-07-19
DE102009004218A1 (de) 2010-07-15
TWI463052B (zh) 2014-12-01

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