US20220178062A1 - Sewing machine having a thread finger assembly - Google Patents

Sewing machine having a thread finger assembly Download PDF

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Publication number
US20220178062A1
US20220178062A1 US17/602,762 US202017602762A US2022178062A1 US 20220178062 A1 US20220178062 A1 US 20220178062A1 US 202017602762 A US202017602762 A US 202017602762A US 2022178062 A1 US2022178062 A1 US 2022178062A1
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US
United States
Prior art keywords
thread
sewing machine
loop
finger
thread finger
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.)
Abandoned
Application number
US17/602,762
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English (en)
Inventor
Harald Kallenbach
Berthold Becker
Stefan Samstag
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.)
Pfaff Industriesysteme und Maschinen GmbH
Original Assignee
Pfaff Industriesysteme und Maschinen GmbH
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 Pfaff Industriesysteme und Maschinen GmbH filed Critical Pfaff Industriesysteme und Maschinen GmbH
Assigned to PFAFF INDUSTRIESYSTEME UND MASCHINEN GMBH reassignment PFAFF INDUSTRIESYSTEME UND MASCHINEN GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BECKER, BERTHOLD, KALLENBACH, HARALD, SAMSTAG, STEFAN
Publication of US20220178062A1 publication Critical patent/US20220178062A1/en
Abandoned legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B61/00—Loop holders; Loop spreaders; Stitch-forming fingers
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B1/00—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both
    • D05B1/08—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making multi-thread seams
    • D05B1/10—Double chain-stitch seams
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/02—Loop takers, e.g. loopers for chain-stitch sewing machines, e.g. oscillating

Definitions

  • the invention relates to a sewing machine having a thread finger assembly.
  • Sewing machines are known in many embodiments, for example from EP 3 088 589 B1, EP 3 360 994 A1, U.S. Pat. No. 6,276,289 B1 and DE 10 2013 107 270 B3.
  • DE 20 2012 104 187 U1 discloses a chain stitch sewing machine.
  • DE 87 13 500 U1 discloses a double chain stitch sewing machine with a hook and a hook thread spreader.
  • thread beginning portions may be drawn away from a visible region of the sewing material in a controlled manner at the seam beginning. In this case, there is no thread beginning portion in the visible region that might spoil the visual appearance. The sewn seam begins with a neat stitch.
  • the fingertip of the at least one thread finger is located between a hook and a stitch plate of the sewing machine. Such an arrangement of the fingertip of the at least one thread finger enables secure catching of the thread loop.
  • the loop pull-out position of the at least one thread finger may at the same time be a neutral position of the thread finger, in which it may remain during further sewing after its use at the seam beginning.
  • the thread loop pulled out by the thread finger of the thread finger assembly may be an upper thread loop.
  • the thread finger may be of small thickness.
  • a bent embodiment of the at least one thread finger according to the invention results in the thread finger occupying very little installation space during its displacement movement in the critical stitch forming region.
  • the bending of the bent thread finger embodiment may be adapted to a displacement movement of the thread finger with respect to its curvature, so that a trajectory of the thread finger is at least approximately bent like the thread finger.
  • a catcher hook disposed at the free end of the at least one thread finger has proven to be particularly suitable for securely catching the thread loop.
  • a thread finger assembly having two thread fingers which can be assigned to two thread loops of a two-needle sewing machine may be used together with a two-needle sewing machine.
  • a slotted guide for guiding a displacement movement of the thread finger between the loop engagement position and the loop pull-out position has proven to be particularly suitable for guiding the displacement movement in a reproducible and quick manner.
  • thread finger drive designed as a pneumatic drive.
  • an electric motor drive may be used as the thread finger drive.
  • the sewing machine may be a chain stitch sewing machine and, in particular, a double chain stitch sewing machine.
  • a thickness of the thread finger in the direction of the distance between the hook and the stitch plate of the sewing machine which is at most 2 mm makes it possible to guide a hook tip of the hook close to the stitch plate despite the finger tip of the thread finger being intermediate in the loop engagement position, which leads to the possibility of working with short thread loops and correspondingly to short possible thread beginning portions and thread end portions.
  • the distance between the hook and the stitch plate where the thread finger engages between these two components need only be configured slightly larger than the thickness of the thread finger, for example at most 2 mm larger than the thickness of the thread finger.
  • the thickness of the thread finger in the direction of the distance between the hook and the stitch plate is preferably at most 1.8 mm and may in particular be at most 1.5 mm.
  • a small width of the thread finger transverse to its longitudinal extension being smaller than 5 mm allows a clean engagement even with small thread loops, which in turn keeps the maximum thread length required for the thread loop advantageously small.
  • the width of the thread finger transverse to the longitudinal extension thereof may be less than 4 mm, may be less than 3 mm and may also be less than 2 mm.
  • FIG. 1 perspectively shows main components of a sewing machine of a sewing system for sewing, in particular, seams located multi-dimensionally in space;
  • FIG. 2 from a viewing direction similar to FIG. 1 , shows a magnified thread finger assembly of the sewing machine, wherein thread fingers of the thread finger assembly are in a loop engagement position for the engagement in thread loops generated by the sewing machine in a stitch forming region;
  • FIG. 3 perspectively, in a front view, shows stitch forming components of the sewing machines, including the thread fingers, again in the loop engagement position;
  • FIG. 4 in a view similar to FIG. 3 , shows the stitch forming components with the thread fingers of the thread finger assembly in a loop pull-out position which is displaced in an obliquely downward manner away from the stitch forming region relative to the loop engagement position for pulling out the thread loops;
  • FIG. 5 shows a side view from viewing direction V in FIG. 1 of the stitch forming components shown in FIGS. 3 and 4 , with the thread fingers displaced from the loop engagement position.
  • a sewing system serves for sewing multi-dimensional seams and in particular seams that are not evenly located three-dimensionally in space.
  • An application example for the sewing system is the attachment of decorative seam applications in the interior space of vehicles, for example on instrument panels, door side panels or arm rests.
  • the sewing system includes a sewing machine 1 , main components of which are shown in FIG. 1 .
  • the sewing machine 1 is supported by an arm of a robot, which is not shown in more detail, with which the sewing machine 1 may be controlled in a random manner to be oriented in space in five or six degrees of freedom.
  • the sewing machine 1 is a double chain stitch sewing machine.
  • a Cartesian xyz coordinate system is indicated in each of the figures.
  • the x-axis along which the seam is generated in an initial position of stitch forming tools described in more detail below, runs obliquely to the rear left in FIG. 1 .
  • the y-axis runs obliquely to the front left in FIG. 1 and the z-axis runs upwards in FIG. 1 .
  • the sewing machine 1 has a housing 2 with a C-shaped basic structure parallel to the yz plane with a housing upper part 3 , a housing lower part 4 and a stand 5 connecting these two parts to form the C shape.
  • the housing upper part 3 and the housing lower part 4 run along the y direction.
  • the stand runs along the z-direction.
  • the sewing machine 1 has two sewing needles 6 , 7 (cf. FIG. 5 ) which are carried by a common needle bar 8 .
  • the needle bar 8 is mounted in a needle bar upper part driven up and down parallel to the z-axis in the housing upper part 3 .
  • Two hooks 9 , 10 serve as further stitch forming components, which are mounted on a hook lower part 11 and driven synchronously with the sewing needles 6 , 7 for stitch formation.
  • the hooks 9 , 10 are designed as swing or pendulum hooks swinging about an axis parallel to the y-axis.
  • the hooks 9 , 10 may be designed to form a chain stitch.
  • the hooks 9 , 10 may be designed as inline hooks.
  • the hook lower part 11 forms a column of the sewing machine 1 .
  • the hook lower part 11 is mounted to the housing lower part 4 . Due to the column design of the hook lower part 11 , a stitch forming region in which the seam is generated by the sewing machine 1 is very freely accessible from all sides.
  • the two sewing needles 6 , 7 are driven up and down along a longitudinal needle bar axis. Synchronously to this, a swivelling movement of the hooks 9 , 10 is driven.
  • the two sewing needles 6 , 7 penetrate stitch holes in a stitch plate 11 a on which the sewing material rests during the stitch formation.
  • the stitch plate 11 a is arranged above the hook lower part 11 with the two hooks 9 , 10 and is configured to be bent in a manner complementary to the swinging movement of the hooks 9 , 10 .
  • the sewing machine 1 has a thread finger assembly 12 , which is shown as a whole in FIG. 2 .
  • the thread finger assembly 12 serves to pull an upper thread 13 (cf. FIG. 4 ) downwardly from a sewing material visible region after a first stitch of the sewing machine 1 , thereby ensuring a neat seam pattern.
  • the thread finger assembly 12 has two thread fingers 14 , 15 . Each of these thread fingers 14 , 15 is assigned to one of the two stitch forming component pairs sewing needle 6 /hook 9 and sewing needle 7 /hook 10 . At their free ends, the two thread fingers 14 , 15 each have a thread catcher hook 15 a . An extension of the thread fingers 14 , 15 along the z-direction, that is to say a thickness of the thread fingers, is at most 2 mm A width of the thread fingers 14 , 15 along the y-direction is at most 5 mm.
  • the two thread fingers 14 , 15 can be actuated between a loop engagement position shown in FIGS. 1 to 3 and a loop pull-out position displaced downwards relative thereto, which is shown in FIG. 4 .
  • the thread fingers 14 , 15 engage a thread loop of the respective upper thread 13 generated by the sewing machine 1 in the stitch forming region.
  • the thread finger 14 engages the upper thread loop guided by the sewing needle 6 and the thread finger 15 engages the upper thread loop guided by the sewing needle 7 .
  • This engagement takes place below the sewing material resting on the stitch plate.
  • fingertips of the two thread fingers 14 , 15 are located between the respective hook 9 , 10 and the stitch plate 11 a.
  • the two thread fingers 14 , 15 are displaced away from the stitch forming region relative to the loop engagement position for pulling out the upper thread loops, as shown by a comparison of FIGS. 3 and 4 .
  • the two thread fingers 14 , 15 are configured as to be bent.
  • a bending of the thread fingers 14 , 15 is adapted with respect to its curvature to a curvature of a displacement movement between the loop engagement position and the loop pull-out position.
  • a trajectory of the thread fingers 14 extends as to be bent approximately like the thread fingers 14 , 15 themselves.
  • This trajectory as well as the curvature of the thread fingers 14 , 15 is in turn designed as to be complementary to the bent design of the stitch plate 11 a as well as to the swinging movement of the hooks 9 , 10 , so that the thread finger movement is possible without interference in the small installation space between the stitch plate 11 a and the hooks 9 , 10 .
  • This trajectory of the displacement movement of the thread fingers 14 , 15 is predetermined by a slotted guide 16 .
  • the latter comprises a bent slotted oblong hole 17 which is parallel to the xz plane.
  • Two guide bolts of a fetcher lever 19 are guided in the slotted oblong hole 17 of the slotted guide 16 , to which a thread finger carrier 20 is fixed.
  • the fetcher lever 19 is hingedly connected to a piston rod 22 of a double-acting pneumatic cylinder 23 via a connecting lever 21 .
  • a transmission movement of the connecting lever 21 is guided in a base body 24 via an oblong hole 25 extending parallel to the y-direction.
  • the pneumatic cylinder 23 constitutes a thread finger drive 26 of the thread finger assembly 12 .
  • the thread finger assembly 12 is mounted on the lower housing portion 4 of the sewing machine 1 via the base body 24 .
  • the sewing machine 1 operates the thread finger assembly 12 as follows:
  • the formation of the first stitch of the seam to be sewn is triggered.
  • the two sewing needles 6 , 7 which each guide an upper thread 13 , penetrate the sewing material and the stitch plate 11 a from above through their respective assigned stitch holes.
  • the sewing needles 6 , 7 are moved upwards again a little, so that two upper thread loops are formed under the sewing material between the stitch plate 11 a and the hooks 9 , 10 .
  • the thread fingers 14 , 15 are transferred from a neutral position, which may correspond to the loop pull-out position, to the loop engagement position (cf. e.g. FIG. 3 ).
  • the fingertips of the thread fingers 14 , 15 penetrate into the formed upper thread loops.
  • the thread fingers are brought back into the loop pull-out position by retraction of the piston rod 22 , wherein the catcher hooks 15 a take along the respective upper thread 13 and pull an upper thread beginning piece in each case downwards through the sewing material, out of the sewing material visible region.
  • the thread fingers remain in the loop pull-out position or the neutral position.
  • the sewing head of the sewing machine 1 is displaced three-dimensionally in space by the arm of the robot so that even difficult-to-access seam locations may be reached.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US17/602,762 2019-04-12 2020-03-20 Sewing machine having a thread finger assembly Abandoned US20220178062A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102019205303.3A DE102019205303A1 (de) 2019-04-12 2019-04-12 Fadenfinger-Baugruppe für eine Nähmaschine
DE102019205303.3 2019-04-12
PCT/EP2020/057855 WO2020207769A1 (de) 2019-04-12 2020-03-20 Nähmaschine mit einer fadenfinger-baugruppe

Publications (1)

Publication Number Publication Date
US20220178062A1 true US20220178062A1 (en) 2022-06-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US17/602,762 Abandoned US20220178062A1 (en) 2019-04-12 2020-03-20 Sewing machine having a thread finger assembly

Country Status (6)

Country Link
US (1) US20220178062A1 (zh)
EP (1) EP3953518A1 (zh)
JP (1) JP2022526681A (zh)
CN (1) CN113710844B (zh)
DE (1) DE102019205303A1 (zh)
WO (1) WO2020207769A1 (zh)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4169422A (en) * 1976-03-29 1979-10-02 Union Special Corporation Automatic chain-stitch sewing machine
US4984526A (en) * 1986-09-30 1991-01-15 Juki Corporation Thread chain guiding device for overedge sewing machines
US5134948A (en) * 1989-09-11 1992-08-04 Brother Kogyo Kabushiki Kaisha Overlocking sewing machine and method for performing overlock sewing in overlocking sewing machine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8713500U1 (de) * 1987-09-29 1987-12-03 Pfaff Industriemaschinen Gmbh, 6750 Kaiserslautern Doppelkettenstichnähmaschine mit Greifer und Greiferfadenspreizer
JP3004860B2 (ja) * 1993-06-08 2000-01-31 ジューキ株式会社 オーバーロックミシンの針糸さばき装置
SE512359C2 (sv) * 1998-07-09 2000-03-06 Viking Sewing Machines Ab Anordning av trådavskärning i en symaskin samt användning av anordningen för neddragning av övertråd
DE202012104187U1 (de) * 2012-11-02 2014-02-05 Ksl Keilmann Sondermaschinenbau Gmbh Kettenstichnähmaschine
DE102013107270B3 (de) * 2013-07-09 2014-12-24 Hsien-Chang Tseng Nähhakensystemspezifische Fadengreifervorrichtung für Nähmaschinen
DE102015207758A1 (de) * 2015-04-28 2016-11-03 Dürkopp Adler AG Nähanlage sowie Betriebsverfahren hierfür
DE102017201929A1 (de) * 2017-02-08 2018-08-09 Dürkopp Adler AG Doppelsteppstich-Nähmaschine sowie Verfahren zur Erzeugung eines Naht-Anfangsoberfadens mit einem geringen Soll-Nahtüberstand

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4169422A (en) * 1976-03-29 1979-10-02 Union Special Corporation Automatic chain-stitch sewing machine
US4984526A (en) * 1986-09-30 1991-01-15 Juki Corporation Thread chain guiding device for overedge sewing machines
US5134948A (en) * 1989-09-11 1992-08-04 Brother Kogyo Kabushiki Kaisha Overlocking sewing machine and method for performing overlock sewing in overlocking sewing machine

Also Published As

Publication number Publication date
EP3953518A1 (de) 2022-02-16
CN113710844B (zh) 2024-03-05
DE102019205303A1 (de) 2020-10-15
JP2022526681A (ja) 2022-05-25
CN113710844A (zh) 2021-11-26
WO2020207769A1 (de) 2020-10-15

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