EP1257706A1 - Method and device for mechanically sewing a double chain stitch seam - Google Patents
Method and device for mechanically sewing a double chain stitch seamInfo
- Publication number
- EP1257706A1 EP1257706A1 EP00990581A EP00990581A EP1257706A1 EP 1257706 A1 EP1257706 A1 EP 1257706A1 EP 00990581 A EP00990581 A EP 00990581A EP 00990581 A EP00990581 A EP 00990581A EP 1257706 A1 EP1257706 A1 EP 1257706A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thread
- sewing
- needle
- loop
- auxiliary part
- 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
Links
Classifications
-
- 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
- D05B61/00—Loop holders; Loop spreaders; Stitch-forming fingers
Definitions
- the invention relates to a method for machine sewing a double chain stitch, the double chain stitch being formed by means of an industrial sewing machine with a sewing needle and needle thread, as well as a main hook and hook thread, by locking the thread loops on the underside of the chain, thread loops placed in a chain-like manner, the course of the stitch formation process being particularly transverse Main gripper moving towards the seam direction in the loop stroke position of the sewing needle picks up the needle thread loop and guides the looper thread through the loop, while the needle thread loop slides along the main looper, the looper thread and the needle thread loop being stretched into a thread triangle into which the needle sticks in the subsequent downward path.
- the formation of the double chain stitch seam is unproblematic.
- high stitch speeds of over 4000, even up to 6000 stitches per minute are generated.
- the effect occurs here that when sewing in the direction of the seam, a thread triangle consisting of the thread loop and the looper thread spans solely through the transport of the sewing material, into which the sewing needle then sticks when going downward. This locks the thread loops.
- the thread triangle is not properly stretched or is not stretched in the correct position, there will be skipped stitches that will cause the seam to open. Such skipped stitches can occur, for example, when the successive puncture points of the needle are very closely adjacent, since then the area of the thread triangle is very small.
- the invention has for its object to provide a method and a device of the generic type with which the locking of a double chain stitch is ensured in a simple manner and with high precision even at high sewing speeds, especially when the direction of the seam is not straight and if at the end of the seam there is a reversal of the sewing direction opposite to the sewing direction.
- the invention proposes that to avoid missing stitches by means of a driven auxiliary part, the needle thread loop and the hook thread below the sewing plane in the
- the area between the main hook and the sewing plane is brought together at a distance from the sewing needle and the main hook and is held and moved in such a way that the thread triangle is stretched into which the sewing needle sticks when going down.
- the procedure according to the invention ensures that the thread triangle required for locking, into which the sewing needle sticks when going downward, is formed and aligned in any case so that the needle sticks into the area surrounded by the thread triangle when going downward.
- the auxiliary part can be without function or can also be stopped. If the stitches to be produced are very close together, the thread triangle can be stretched over a correspondingly large area, since the formation of the thread triangle does not depend on the path that the material has traveled, but the size of the thread triangle is caused solely by the movement of the auxiliary part.
- Flawless locking is also possible with non-straight seam formation, but for example with a zigzag seam, a transverse seam or other seam shapes, because even with such seam shapes the thread triangle is properly stretched by means of the auxiliary part in the area in which the sewing needle sticks when going downwards.
- the sewing direction is reversed at the end of the double chain stitch seam, that after the sewing direction is reversed in the stitch rhythm of the sewing needle moving up and down, the thread loop formed by the sewing needle below the fabric web is picked up by the main gripper, then by means of the driven auxiliary part which the thread loop forming needle thread below the sewing plane together with the looper thread at a distance from the needle and the main looper in the seam direction is brought together in front of them and thus held and the merged thread region is moved in the seam direction and a thread triangle formed from the loop forming the loop
- the auxiliary part is driven synchronously with the sewing machine or with the stitch rhythm of the sewing needle.
- auxiliary part is driven by the sewing machine.
- the auxiliary part can be coupled to the drive of the sewing machine via a belt drive, so that a common drive is sufficient for both elements.
- the auxiliary part is driven by a separate drive.
- the auxiliary part is driven by a servo drive.
- the separate drive is only put into operation when the auxiliary part is to be moved.
- the drive with a separate drive makes it possible to use conventional sewing machines and to operate them with the corresponding procedure according to the invention, without the sewing machine itself having to be converted or changed.
- the separate drive in particular in the form of a servo drive, creates the possibility of aligning the drive precisely to the particular problem of seam formation or of only starting the drive when movement of the auxiliary part is required.
- Main looper the thread loop is pushed onto the main looper against the working direction by means of the auxiliary part.
- the invention further relates to a device for machine sewing a double chain stitch, the double chain stitch being formed by means of an industrial sewing machine with a sewing needle and needle thread, as well as a main hook and hook thread, in that the thread of the thread locks thread loops placed in a chain-like manner on the underside of the material, during which the Stitching process of the main gripper, in particular, moving transversely to the sewing direction in the looping stroke position of the sewing needle, picks up the needle thread loop and guides the hook thread through the loop, while the needle thread loop slides along the neck of the main hook, the hook thread and the needle thread loop being stretched into a thread triangle into which the needle is threaded stabs in the subsequent downward gear.
- the needle thread loop and the hook thread below the sewing plane in the area between the main hook and sewing plane are brought together at a distance from the sewing needle and the main hook and are held and moved in such a way that the thread triangle is stretched, into which the sewing needle pierces when going downward.
- the design according to the invention ensures that even with a non-rectilinear seam formation or with very a short distance between the puncture points of the sewing needle or when sewing against the direction of the seam, for example to the seam end, the thread triangle is simply and precisely clamped even at high sewing speed, into which sewing needle can penetrate when going downwards, so that the double chain stitch seam is properly locked and also a proper seam closure can be created.
- the procedure according to the invention or the design of the device according to the invention results in gentle treatment of the threads by the auxiliary part, so that the risk of thread breakage is largely reduced.
- a gear coupling of the auxiliary part to the sewing machine drive a synchronous movement of the elements is achieved, so that a high seam precision is achieved.
- the sewing process is intervened at an early stage in order to ensure the appropriate thread guidance.
- the procedure and device according to the invention ensure that the engagement by means of the auxiliary part begins directly when the thread loop is picked up by the main gripper and only ends when the thread loop is released at a specific point in time when the locking of the double chain stitch is completed. If you look at a fully executed double chain stitch, the thread loop picked up is located on the main looper for more than 90% of the total time sequence for an overall stitch sequence. Within this time, the thread loop assumes precisely predeterminable positions at certain points in time in order to correctly stretch the thread triangle and to ensure correct locking without producing missing stitches which would result in the seam opening.
- auxiliary part has several functional surfaces or functional edges, in cooperation with the movement sequence of the auxiliary part, enables the thread loop to be brought into defined temporal and spatial positions that are decisive for the sewing process, or the thread triangle to be positioned appropriately large and precisely. This ensures, in particular, that even in fast-paced automatic machine operation, a double chain stitch seam both in a straight line and in the seam formation deviating from the straight line as well as in
- the functional edge specified in the claims can be designed in any manner. It can be represented, for example, by an angled shape of a molded part. But it can also be formed by a smooth rod or the like, which has a notch or a similar element. It is only essential for the function that the functional edge holds the needle thread and the hook thread together at one point, so that the corresponding thread triangle can be stretched by the movement of the auxiliary part.
- Figure 1 is a schematic view of the elements of interest here in front view; Figures 2 and 3 seen the essential elements in different functional positions in plan view.
- the essential elements of the industrial sewing machine producing double chain stitches are the sewing needle 1 with a perforation 2 on the needle tip for the passage of the needle thread 3, which represents the upper thread, and a main hook 5 located below the sewing plane 4 and driven synchronously with the sewing needle 1, the working direction of which is at 6 is specified.
- Sewing needle 1 performs movements in the direction of arrow 7.
- the main looper 5 guides the looper thread 8, which exits through a hole 9 in the main looper.
- the drawing does not show a stitch plate or the like, which is used to place the fabric web in the near plane 4, as well as a fabric presser, which may be provided, which presses the fabric in the near plane 4 against the stitch plate or against a possibly also not shown Fabric backer (transporter) presses. While in FIG. 1 the viewing direction of the drawing figure is directed parallel to the transport direction of the corresponding fabric to be sewn in the near plane 4, the viewing direction in FIGS. 2 and 3 is orthogonal to the sewing plane 4, namely seen below the sewing plane 4.
- the normal direction of transport of the goods to be sewn is indicated by an arrow at 10.
- This direction corresponds to the normal sewing direction, while the opposite direction corresponds to the reversal of the direction opposite to the sewing direction.
- an auxiliary part 11 is effective (the mode of operation is explained in more detail below), which can be ineffective when sewing in the sewing direction 10, provided that the thread triangle described later is stretched solely by the movement of the sewing material ,
- FIGS. 2 and 3 show the thread triangle formed by the looper thread 8 and the loop of the needle thread 3, into which the needle 1 sticks with the continuous needle thread 3.
- this triangle of threads is stretched independently solely by the material transport, so that the puncture of the outgoing needle 1 in the the area around the stretched triangle is automatically correct.
- the auxiliary part 11 ensures that the thread triangle is stretched so that the area surrounded by the thread triangle is hit by the needle 1 in the downward direction.
- the auxiliary part 11 is shown in different positions, namely in the working positions I to IV, the
- Auxiliary part 11 executes a curved, self-contained movement deviating from the circular shape, starting from position I via position II to position III and then to position IV and subsequently back to position I.
- the main looper 5 picks up the thread loop of the needle thread 3 formed by the sewing needle 1, as is particularly illustrated in FIG.
- the main gripper 5 moves transversely to the seam direction 10 in the direction of the arrow 6.
- the auxiliary part 11 moves from the position according to I to the position II (as shown in FIGS. 1 and 2), with the first functional surface 12 , for example an edge, the needle thread forming the loop 3 is picked up and pushed onto the main hook 5 against its working direction 6 and held in order to prevent it from sliding off the main hook 5 and to span a sufficiently large triangle of threads. This is done by a relatively rapid movement of the auxiliary part 11 against the working direction 6 of the main gripper 5, from position I to position II.
- the auxiliary part 11 is then shifted from position II to position III until the needle thread 3 and the hook thread 8 have the edge
- auxiliary part 11 for example a corner area, angular area or rounded corner area, of the auxiliary part 11 is reached and held there.
- a thread triangle is stretched between the area of the needle thread loop, which is held on the main hook 5, the free hook thread 8 and the main hook 5, into which the sewing needle 1 sticks when going downward.
- the needle thread 3 and the looper thread 8 are guided on the corner area 13 until the sewing needle 1 has reliably inserted into the thread triangle.
- the second functional surface 14 for example an edge, the The area where the threads come together is led down from the main hook 5, the thread triangle remaining open while reducing the triangular area until the next loop formation of the needle thread 3 begins.
- the locked stitch can slide off the hook 5 and the sewing process can begin analogously from the beginning. This is illustrated by the illustration in FIG. 3, position IV, from which position the auxiliary part 11 in turn assumes the position I.
- the main gripper 5 moves against the working direction 6 again in the
- the auxiliary part 11 is represented by an L-shaped angle.
- the cross section of the legs is preferably round to prevent damage to the threads.
- the shape of the auxiliary part 11 is not necessarily L-shaped, but any shape is possible as long as only the corresponding functional surfaces and functional edges are obtained.
- the auxiliary part can be actuated by a separate drive. The actuation can also take place via an eccentric drive, with the eccentric design realizing the slowed and accelerated movement of the auxiliary part 11 in a simple manner is. Of course, it is also possible to forcibly couple the auxiliary part to the drive of the sewing machine in order to achieve synchronism.
- the invention is not limited to the exemplary embodiment, but is variable in many ways within the scope of the disclosure.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI200030604T SI1257706T1 (en) | 2000-01-17 | 2000-12-21 | Method and device for mechanically sewing a double chain stitch seam |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10001611A DE10001611C2 (en) | 2000-01-17 | 2000-01-17 | Method and device for mechanically locking a chain stitch seam |
DE10001611 | 2000-01-17 | ||
PCT/DE2000/004626 WO2001053591A1 (en) | 2000-01-17 | 2000-12-21 | Method and device for mechanically sewing a double chain stitch seam |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1257706A1 true EP1257706A1 (en) | 2002-11-20 |
EP1257706B1 EP1257706B1 (en) | 2004-11-17 |
Family
ID=7627699
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00990581A Expired - Lifetime EP1257706B1 (en) | 2000-01-17 | 2000-12-21 | Method and device for mechanically sewing a double chain stitch seam |
Country Status (27)
Country | Link |
---|---|
US (1) | US6390004B2 (en) |
EP (1) | EP1257706B1 (en) |
JP (1) | JP4692797B2 (en) |
KR (1) | KR100650234B1 (en) |
CN (1) | CN100334284C (en) |
AR (1) | AR027233A1 (en) |
AT (1) | ATE282730T1 (en) |
AU (1) | AU771029B2 (en) |
BR (1) | BR0016963A (en) |
CA (1) | CA2387118C (en) |
CZ (1) | CZ301876B6 (en) |
DE (2) | DE10001611C2 (en) |
EE (1) | EE04530B1 (en) |
EG (1) | EG23216A (en) |
ES (1) | ES2226975T3 (en) |
GT (1) | GT200100006A (en) |
HR (1) | HRP20020289A2 (en) |
HU (1) | HUP0202583A2 (en) |
IL (1) | IL149130A (en) |
MX (1) | MXPA02002726A (en) |
MY (1) | MY127132A (en) |
PL (1) | PL202071B1 (en) |
PT (1) | PT1257706E (en) |
TR (1) | TR200201803T2 (en) |
TW (1) | TW541375B (en) |
WO (1) | WO2001053591A1 (en) |
YU (1) | YU49325B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CZ302877B6 (en) * | 2010-12-17 | 2011-12-28 | Technická univerzita v Liberci | Device for making thread loop |
CN103031670B (en) * | 2011-09-30 | 2014-09-10 | 兄弟工业株式会社 | Sewing machine |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3065717A (en) * | 1958-02-07 | 1962-11-27 | Union Special Machine Co | Sewing machines |
JPS5231096Y1 (en) * | 1969-06-12 | 1977-07-15 | ||
GB1332580A (en) * | 1970-11-13 | 1973-10-03 | Rimoldi C Spa Virginio | Sewing machines |
US3783810A (en) * | 1970-11-18 | 1974-01-08 | Rimoldi C Spa Virginio | Looper driving device with periodically variable speed in zig-zag chainstitch sewing machines |
JPS5414128Y2 (en) * | 1972-04-11 | 1979-06-13 | ||
US3867891A (en) * | 1972-12-26 | 1975-02-25 | Oehler Ag | Multi-needle double chain-stitch quilting machine |
JPS5469066U (en) * | 1977-10-20 | 1979-05-16 | ||
DE3201254C2 (en) * | 1982-01-16 | 1983-12-29 | Union Special Gmbh, 7000 Stuttgart | sewing machine |
IL71041A (en) * | 1984-02-23 | 1986-07-31 | Shenkar College Textile Tech | Yarns and threads and their use in the fabrication of textile products |
EP0499651A1 (en) * | 1991-02-14 | 1992-08-26 | Schips Ag Nähautomation | Sewing machine |
JP3004860B2 (en) * | 1993-06-08 | 2000-01-31 | ジューキ株式会社 | Needle thread handling device for overlock sewing machine |
JP3487638B2 (en) * | 1994-05-16 | 2004-01-19 | ジューキ株式会社 | Eye-opening prevention device for sewing machine |
JPH10509618A (en) * | 1994-11-23 | 1998-09-22 | シャリフォビッチ タジバーエフ、ザリフ | Two thread chain stitch sewing machine "Zarif" |
JPH08280973A (en) * | 1995-04-12 | 1996-10-29 | Pegasus Sewing Mach Mfg Co Ltd | Method and apparatus for controlling looper thread of double chain stitch sewing machine |
DE19719372C2 (en) * | 1997-05-07 | 2001-12-06 | Altin Naehtechnik Prototyping | Method and device for securing the seam ends by pulling in the thread chain on single-needle and double-needle sewing machines |
-
2000
- 2000-01-17 DE DE10001611A patent/DE10001611C2/en not_active Expired - Lifetime
- 2000-12-21 AT AT00990581T patent/ATE282730T1/en active
- 2000-12-21 PL PL357368A patent/PL202071B1/en not_active IP Right Cessation
- 2000-12-21 CZ CZ20021553A patent/CZ301876B6/en not_active IP Right Cessation
- 2000-12-21 BR BR0016963-3A patent/BR0016963A/en not_active IP Right Cessation
- 2000-12-21 PT PT00990581T patent/PT1257706E/en unknown
- 2000-12-21 CA CA002387118A patent/CA2387118C/en not_active Expired - Lifetime
- 2000-12-21 CN CNB008184461A patent/CN100334284C/en not_active Expired - Fee Related
- 2000-12-21 YU YU19602A patent/YU49325B/en unknown
- 2000-12-21 EE EEP200200258A patent/EE04530B1/en not_active IP Right Cessation
- 2000-12-21 KR KR1020027009157A patent/KR100650234B1/en active IP Right Grant
- 2000-12-21 EP EP00990581A patent/EP1257706B1/en not_active Expired - Lifetime
- 2000-12-21 ES ES00990581T patent/ES2226975T3/en not_active Expired - Lifetime
- 2000-12-21 MX MXPA02002726A patent/MXPA02002726A/en active IP Right Grant
- 2000-12-21 TR TR2002/01803T patent/TR200201803T2/en unknown
- 2000-12-21 DE DE50008707T patent/DE50008707D1/en not_active Expired - Lifetime
- 2000-12-21 WO PCT/DE2000/004626 patent/WO2001053591A1/en active IP Right Grant
- 2000-12-21 IL IL14913000A patent/IL149130A/en not_active IP Right Cessation
- 2000-12-21 AU AU30017/01A patent/AU771029B2/en not_active Ceased
- 2000-12-21 HU HU0202583A patent/HUP0202583A2/en unknown
- 2000-12-28 JP JP2000404714A patent/JP4692797B2/en not_active Expired - Fee Related
-
2001
- 2001-01-15 TW TW090100819A patent/TW541375B/en not_active IP Right Cessation
- 2001-01-16 GT GT200100006A patent/GT200100006A/en unknown
- 2001-01-17 US US09/766,684 patent/US6390004B2/en not_active Expired - Lifetime
- 2001-01-17 MY MYPI20010221A patent/MY127132A/en unknown
- 2001-01-17 AR ARP010100200A patent/AR027233A1/en active IP Right Grant
- 2001-01-17 EG EG20010054A patent/EG23216A/en active
-
2002
- 2002-04-05 HR HR20020289A patent/HRP20020289A2/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0153591A1 * |
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