EP1144746A1 - Chain stitch sewing machine - Google Patents
Chain stitch sewing machineInfo
- Publication number
- EP1144746A1 EP1144746A1 EP00902469A EP00902469A EP1144746A1 EP 1144746 A1 EP1144746 A1 EP 1144746A1 EP 00902469 A EP00902469 A EP 00902469A EP 00902469 A EP00902469 A EP 00902469A EP 1144746 A1 EP1144746 A1 EP 1144746A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thread
- needle
- control
- sewing
- needle bar
- 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
- D05B49/00—Take-up devices, e.g. levers, for the needle thread
- D05B49/04—Take-up devices, e.g. levers, for the needle thread rotary
Definitions
- the invention relates to a chainstitch sewing machine with a needle bar mounted in a housing so that it can be moved and driven in a stroke, and at least one sewing needle which can be fastened to the needle head of the needle bar and to which a needle thread can be fed from a thread spool via a thread tensioner and a thread guiding device the thread guide device comprises a thread take-up which controls the thread take-off as a function of the needle bar stroke.
- the invention is therefore based on the object of creating a chain stitch sewing machine of the type described at the outset which, thanks to an improved thread guide device, permits the sewing of perfect, smooth chain stitch seams even with highly elastic material.
- the thread transmitter has a sensor disk which is seated on a sensor shaft which can be driven synchronously with the needle bar drive, which forms an eccentric pick-up curve for the thread take-up on the circumference and with this pick-up between two housing eyelets supported for the cross to the sensor disk protrudes the take-up curve of the needle thread, and / or a thread control in the thread take-off direction is arranged downstream of the thread take-up for each needle thread, which thread control has a control disc seated on a control shaft that can be driven synchronously with the needle bar drive with a circumferential control curve for the thread eyelets supported by two sides of the control disc Control disk guided needle thread.
- the needle thread can be checked in accordance with the course of the pick-up element rotating with the encoder disc in relation to the standing thread eyelets and can be made available and withdrawn in a thread quantity adapted to the respective stitch formation process, without having to come to a standstill must be taken into account, so that, above all, thread retraction and tightening of the thread entanglement is essentially made possible by the thread dispenser alone.
- the thread dispenser alone.
- the repercussions of the thread tensions on the sewing material remain low and seam ripples and The like are largely avoided.
- the encoder shaft drive can be easily derived from the rotary drive of the needle bar and the encoder disc can be designed as a single or double disc and can also be equipped with a thread wiper or the like for thread guidance in the area of the pick-up curve.
- a thread control according to the invention is provided, each needle thread can be individually stabilized and controlled in its drawdown and adapted to the stitch formation sequence that belongs to it.
- This thread control can certainly be combined with a conventional thread feeder, but of course there is a better control and adjustment option for the thread take-off when combined with the new thread feeder, which can then have an encoder disk common to all needle threads.
- the thread take-off conditions on the basis of the control disks are thus superimposed on the thread feeder and its influence on the thread take-off, whereby the thread take-off required for the respective stitch formation process can be set exactly for each needle thread.
- the thread specification or thread take-back that results depending on the course of the pick-up, on the one hand, and on the respective control curve, on the other hand, during the reciprocating stitch movement of the sewing needle, an exact stitch formation takes place without any noticeable effect on the sewing material and the most varied chain stitches can be made with one or more sewing needles and one or more needle threads assigned to them are produced flawlessly and with optimal quality.
- control shaft is designed as an extension of the encoder shaft, so that a common drive is created for the thread transmitter and the thread control. If several needle threads and thus also several thread controls are provided, the control disks of all thread controls can also sit on one and the same control and transmitter shaft.
- Fig. 1 a chainstitch sewing machine according to the invention in side view and Figs. 2 and 3 this sewing machine with its needle bar in the bottom dead center position or in the top dead center position in a front view of a larger scale.
- the looper thread guiding device has a superstructure 3 with a needle bar 5 mounted in a housing 4 so that it can be moved by a stroke, to the needle head 6 of which two sewing needles 7, 8 are fastened.
- An upper drive shaft 11, which engages the needle bar 5 via a crank mechanism 10, serves as the needle bar drive 9.
- Two needle threads 12, 13 are assigned to the two sewing needles 7, 8 and are fed from the thread bobbins 14 via thread tensioners 15 and a thread guiding device 16 to the sewing needles 7, 8 .
- the thread guide device comprises a thread take-up device 17 which controls the thread take-off as a function of the needle bar stroke and additionally a thread control 18, 19 for each needle thread 12, 13 for individual control of the thread take-off.
- the thread transmitter 17 consists of a sensor disk 20, which is seated on a sensor shaft 22 which can be driven synchronously via a drive connection 21 with the needle bar drive 9 and with a circumferential pick-up curve 23 between two thread eyelets 24, 25 which are supported on the housing for the two transverse to the
- the encoder disk 20 projects beyond the needle threads 12, 13 extending over the pickup element 23.
- the encoder disk 20 is composed of two partial disks, between which a thread wiper engages 26 for checking the course of the thread.
- the thread controls 18, 19 each have a control disk 28, 29, which is designed as an extension of the encoder shaft 22 and is therefore also synchronously driven with the needle bar drive 9, and has control disks 30, 31 on the circumference and supported with these in each case between two fixed to the housing Project eyelets 32, 33 for the needle threads 12, 13 guided across the control disks 28, 29.
- the needle threads 12, 13 thus run in the thread guide device 16 from the thread transmitter 17 via corresponding deflection guides 34, 35 to the thread controls 18, 19 and from these via a further housing-fixed thread guide 36 or a needle head-fixed thread guide 37 to the needle eyes.
- a suitable design of the pick-up 23 and the control cams 30, 31 it is therefore possible to individually adjust the deduction of the needle threads 12, 13 to the associated stitch formation process and to release the needle threads in a precisely coordinated amount according to the respective thread interlacing phase, and thus to provide or take back men and tighten the loops formed. This looping and tightening takes place without any noticeable effect on the sewing material, so that a perfect chain stitch seam is produced without gathering or crimping the sewing material.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT7699 | 1999-01-21 | ||
AT0007699A AT410681B (en) | 1999-01-21 | 1999-01-21 | CHAINSTITCH SEWING MACHINE |
PCT/AT2000/000015 WO2000043583A1 (en) | 1999-01-21 | 2000-01-21 | Chain stitch sewing machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1144746A1 true EP1144746A1 (en) | 2001-10-17 |
EP1144746B1 EP1144746B1 (en) | 2003-04-09 |
Family
ID=3480900
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00902469A Expired - Lifetime EP1144746B1 (en) | 1999-01-21 | 2000-01-21 | Chain stitch sewing machine |
Country Status (5)
Country | Link |
---|---|
US (1) | US6405666B1 (en) |
EP (1) | EP1144746B1 (en) |
AT (1) | AT410681B (en) |
DE (1) | DE50001699D1 (en) |
WO (1) | WO2000043583A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3729717B2 (en) * | 2000-08-28 | 2005-12-21 | ペガサスミシン製造株式会社 | Double chain stitch machine |
US6691630B2 (en) * | 2002-02-05 | 2004-02-17 | Ching Chi Machine Co., Ltd. | Looper thread take-up apparatus of a sewing machine |
US6666158B2 (en) * | 2002-02-05 | 2003-12-23 | Ching Chi Machine Co., Ltd. | Looper thread take-up apparatus externally added to outer end of lower driving shaft of a sewing machine |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2398667A (en) * | 1942-06-23 | 1946-04-16 | Union Special Machine Co | Sewing machine |
US2385960A (en) * | 1944-04-11 | 1945-10-02 | Singer Mfg Co | Rotary take-up mechanism for sewing machines |
US2895441A (en) * | 1955-08-10 | 1959-07-21 | Phoenix Nahmaschinen A G Baer | Sewing machine |
JPH01199895A (en) * | 1988-02-03 | 1989-08-11 | Shibuya Kogyo Co Ltd | Method for washing container |
US5085159A (en) * | 1988-04-01 | 1992-02-04 | Pegasus Sewing Machine Mfg. Co., Ltd. | Needle thread feed regulating device for overseaming sewing machine |
EP0783049B1 (en) * | 1995-03-29 | 2002-10-16 | Jaguar Co., Ltd. | Overlock sewing machine |
JP3489089B2 (en) * | 1995-09-01 | 2004-01-19 | ヤマトミシン製造株式会社 | Looper threading device |
US6263812B1 (en) * | 2000-10-13 | 2001-07-24 | Ching Chi Machine Co., Ltd. | Looper thread take-up structure of sewing machine capable of very easily clearing up tangling thread |
-
1999
- 1999-01-21 AT AT0007699A patent/AT410681B/en active
-
2000
- 2000-01-21 WO PCT/AT2000/000015 patent/WO2000043583A1/en active IP Right Grant
- 2000-01-21 EP EP00902469A patent/EP1144746B1/en not_active Expired - Lifetime
- 2000-01-21 DE DE50001699T patent/DE50001699D1/en not_active Expired - Fee Related
- 2000-01-21 US US09/914,738 patent/US6405666B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0043583A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2000043583A1 (en) | 2000-07-27 |
ATA7699A (en) | 2002-11-15 |
EP1144746B1 (en) | 2003-04-09 |
US6405666B1 (en) | 2002-06-18 |
DE50001699D1 (en) | 2003-05-15 |
AT410681B (en) | 2003-06-25 |
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