EP3449050A1 - Device and process of control of the lenght of needleful in sewing machines with running stitch - Google Patents
Device and process of control of the lenght of needleful in sewing machines with running stitchInfo
- Publication number
- EP3449050A1 EP3449050A1 EP17733049.5A EP17733049A EP3449050A1 EP 3449050 A1 EP3449050 A1 EP 3449050A1 EP 17733049 A EP17733049 A EP 17733049A EP 3449050 A1 EP3449050 A1 EP 3449050A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- thread
- needleful
- needle
- sewing
- wheel
- 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
- 238000009958 sewing Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims description 17
- 238000011084 recovery Methods 0.000 claims abstract description 8
- 238000003780 insertion Methods 0.000 claims abstract description 6
- 230000037431 insertion Effects 0.000 claims abstract description 6
- 239000004744 fabric Substances 0.000 claims description 24
- 230000033001 locomotion Effects 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 230000011664 signaling Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- 238000005304 joining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- D05B1/02—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making single-thread seams
- D05B1/04—Running-stitch seams
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B51/00—Applications of needle-thread guards; Thread-break detectors
Definitions
- the present invention generically concerns a device and relative process of control of the length of needleful in programmable sewing machines, specifically suitable to make seams with so-called running stitch, which is generally used, as ornamental purpose, in manufactured clothes, particularly in the rim of the lapels of jackets, coats, skirts, as well as in the manufacturing of trousers, handbags, gloves and similar items.
- the invention relates to a device and related process suitable to determine, during sewing, how much thread of the needleful remains, so as to adjust a tensioning group to get a more constant sewing throughout the needleful and/or give rise to the look at will thereof.
- the running stitch is made by a single thread of fixed length (called needleful), crossing the flaps of the fabric along its entire length, so as to place alternately on the right and on the back of the cloth to be sewn, so as the sewing stitches, variable and adjustable in length, are alternatively visible on one and the other side of the fabric subjected to sewing.
- needleful fixed length
- the traditional sewing machines, performing running stitch sewing such as those ones described, for example, in the prior art patent documents EP1233094A2 and EP 233095A2, use substantially a vertical axis needle, arranged perpendicularly to a support plane, where the cloth to be sewn is placed.
- the needle can be actuated with reciprocating motion along its axis, so that cyclically passes through the cloth to be sewn, leading, from time to time, a buttonhole of thread of the needleful used for sewing, alternately above and below the support plane.
- An upper end of the needleful of thread is stapled on the cloth under sewing, while the other end is left free and also, below the support plane, a recovery wheel of the thread is provided, arranged in a plane substantially parallel to the axis of the needle, which is composed of a fixed part, having a circular development, and a revolving part which can be operated with rotary motion and synchronized with the needle movement, compared to the fixed part.
- Another upper hook or crochet positioned above the support plane, is designed to hook the buttonhole of thread led by the needle above the support plane and hold it, while the thread is loaded into the warehouse of the recovery wheel.
- a main drawback of the sewing machines with running stitch of the known type is the need to establish a predefine thread needleful, of which it is not possible to determine the remaining amount during sewing.
- the break of the needleful may also be due to the insertion, by the operator, of a length too long or in any case wrong of the needleful itself.
- a purpose of the present invention is to overcome the drawbacks just cited and, in particular, to create a device of control of the length of needleful in sewing machines with running stitch, which allows the operator to avoid to provide part of his attention to the visual control of the length of needleful remained during the sewing operation, in order to use even less skilled operators, with a time and quality saving.
- Another purpose of the present invention is to provide an extremely safe and reliable device of control of the length of needleful in sewing machines with running stitch, which permits to precisely identify when the needleful is almost at its end, so as to allow the operator to join with a subsequent needleful or perform the operation of fixing the needleful yet during sewing, thus getting a substantial time and quality saving.
- Another purpose of the invention is to provide a device of control of the length of needleful in sewing machines with running stitch, enabling the identification of a possible break of the needleful.
- a further purpose of the invention is to indicate a process of control of the length of needleful in sewing machines with running stitch which can be implemented through the device of control referred above.
- a last but not least purpose of the invention is to provide a device of control of the length of needleful in sewing machines with running stitch, which has an essentially simple constructive structure and can be produced at relatively low costs, compared to the achieved advantages.
- control device object of the invention, is basically composed of an array of optical fibres which are inserted into the mobile portion of the wheel of the sewing machine, where the thread runs during the construction of the upper stitch.
- the device includes a dedicated hardware and software, suitable to operate with the cycles of the sewing machine in question.
- the device according to the invention can be interfaced with the upper and lower tensioning systems of the needleful, in order to get a more homogeneous sewing, compared to what can be obtained with sewing machines with running stitch of traditional type.
- the device allows to locate the break of the thread and, thus, functions as sensor of thread break.
- - figure 1 shows a lateral view of a sewing machine with running stitch, which uses the control device according to the invention
- - figure 2 shows a front view of the sewing machine with running stitch of figure 1 , according to the present invention
- figure 3 shows an exploded perspective view of the sewing machine with running stitch of figure 1 , according to the present invention
- FIG. 4 shows an enlargement of a portion of the sewing machine with running stitch of figure 3, according to the present invention
- the needleful In the sewing machines with a traditional running stitch, the needleful has a length determined by the operator and the needle of the sewing machine stops sewing on the cloth under processing at a breakpoint when a situation of "uncontrolled end needleful" occurs, i.e. when the thread of the needleful still presents a prefixed measure (which is not sewn).
- a join method between two needlefuls provides for a situation of "controlled end needleful", where the prefixed length of the thread from the breakpoint is always longer than said prefixed measure (about 8-9 cm, for which the machine does not sew anymore).
- Said prefixed length is currently decided by the operator, who, therefore, must rely on his own ability and which obliges him/her to pay great attention, because it must always check the total needleful length to be loaded and also have a reference point of the cloth under working at which approximately the needleful is ending or continuously control the thread passing through the upper crochet.
- the device allows to detect any break of the thread and, therefore, also works as a sensor of break of the thread.
- the control device identifies the prefixed measure of the needleful of thread and stops the sewing machine when the needle is elevated and ready to be loaded with a new needleful by the operator, who can then restarts to sew by overlapping for a stretch the two needlefuls for a random number of stitches.
- the control device, object of the invention operates similarly, but, in this case, when the sewing machine stops, the operator will discharge the thread of the needleful from the needle, free the fabric of the cloth from the pressing foot of the needle, reposition the needle at the end of one of the stitches previously made, load the second needleful and start again sewing with the latter, which overcomes the first needleful, for a number of stitches that is chosen by the operator itself.
- the device of control according to the invention is made using sensors or optical fibres readers and/or photocells, of the transmitter/receiver type, generally indicated with 7 in the attached figure 4, which are positioned along the path of the thread 4 of the sewing machine 1 and which, in particular, are applied inside the mobile portion 8 of the wheel 9, the latter suitable to the recovery of the thread 4 and arranged in a plane substantially parallel to the axis of the needle 3.
- the wheel 9 substantially comprises a fixed portion 10 and the mobile portion 8, which can be operated with rotary motion around its axis, with respect to the fixed portion 10, synchronized with the movement of the needle 3.
- the mobile portion 8 of the wheel 9 peripherally leads a rotary hook or crochet 11 , placed below the support plane of the sewing machine 1 , which can be engaged with the buttonhole of thread 4 cyclically led by the needle 3 below the support plane, in order to operate the recovery of the stretch of needleful of thread extending from the needle 3 up to the free end of the needleful and its loading inside the rooms of collection of the fixed portion 10 of the wheel 9; in particular, the rooms for collecting the recovered thread 4 include respective tracks, which are separated by a relief and communicating each other, so as to allow the thread 4, inserted into the inlet due to the rotation of the rotary hook or crochet 11 , to pass from one track to another at every cycle of composition of the sewing stitch.
- a groove 5 having a defined angular position is performed on the mobile portion 8 of the wheel 9, in order to maintain a right synchronization with the optical fibers readers or photocells 7 which are able to detect the thread 4; said readers or photocells 7 are interfaced with a digital signal amplifier which, in turn, is connected with a control PCB provided with a proper software program.
- said groove 5 allows to identify, during the rotation of the wheel 9 and therefore of the mobile portion 8, three different reading conditions performed by said photocells 7:
- the detection is possible by means of a proper placement of one or more optical fiber readers or photocells 7, so as to detect the profile of the external circumference of the mobile portion 8.
- the optical fiber reader 7 has three different calibrations and has two LEDs, which turn on according to the following modes:
- the identification of the thread 4 at the groove 5 of the mobile portion 8 of the wheel 9 allows the control device, through the dedicated software program, to stop the machine in the stopping positions corresponding to a prefixed length of thread 4.
- the dedicated applicative software on the basis of the data collected and following a proper processing the latter, allows to signal the stretch of remaining needleful, suggest the insertion of a new needleful and signal the break of the needleful.
- two or more grooves 5 are provided on the mobile portion 8 of the wheel 9, it is possible to obtain other functions, such as the determination of an amount of remaining thread of the needleful and the signal of a length of needleful longer than a maximum allowed value, as well as it is possible to change the positions of the "slave" motors of the sewing machine 1 that modify the tensioning of the needleful and possibly the stitch length and/or to activate a fixing function (forward and backward) and/or to get a determination of the needleful to be inserted (currently entrusted to operator's experience).
- the device of control of the length of needleful in sewing machines with running stitch fully complies with the set task, since it is able to offer absolute operation flexibility, avoiding the need for the operator to stop sewing before the needleful ends (and possibly near the end of the needleful) and to have to put a new predefined needleful of thread, the remaining amount of which is not possible to know during sewing, automatically determining when the needleful is ending and stopping at that time the sewing machine, in order to allow the operator the insertion of a new needleful and also get an alarm of thread break.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITUA2016A002958A ITUA20162958A1 (en) | 2016-04-28 | 2016-04-28 | DEVICE AND PROCEDURE FOR CHECKING THE LUGGAGE LENGTH IN SEWING MACHINES WITH POINT TO FILZA |
PCT/IT2017/000080 WO2017187465A1 (en) | 2016-04-28 | 2017-04-20 | Device and process of control of the lenght of needleful in sewing machines with running stitch |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3449050A1 true EP3449050A1 (en) | 2019-03-06 |
EP3449050B1 EP3449050B1 (en) | 2023-11-08 |
EP3449050C0 EP3449050C0 (en) | 2023-11-08 |
Family
ID=56740372
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17733049.5A Active EP3449050B1 (en) | 2016-04-28 | 2017-04-20 | Device and process of control of the lenght of needleful in sewing machines with running stitch |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3449050B1 (en) |
IT (1) | ITUA20162958A1 (en) |
WO (1) | WO2017187465A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201800009909A1 (en) * | 2018-10-30 | 2020-04-30 | Mori Srl | SEWING MACHINE WITH FILZA STITCH |
CN116149271B (en) * | 2022-11-28 | 2023-09-12 | 钰深(北京)科技有限公司 | Intelligent quality inspection and control method and system for different types of clothes production line production process |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09294883A (en) * | 1996-04-30 | 1997-11-18 | Juki Corp | Needle thread holding device for hand stitch sewing machine |
JP2001070682A (en) * | 1999-09-07 | 2001-03-21 | Pegasus Sewing Mach Mfg Co Ltd | Thread break detecting device in sewing machine |
ITMI20010064A1 (en) * | 2001-01-15 | 2002-07-15 | Conti Complett Spa | SEWING MACHINE FOR THE CREATION OF STITCHES WITH STITCHING STITCH AND HIGH RELIABILITY OF SEWING |
IT1398702B1 (en) * | 2009-12-17 | 2013-03-08 | Conti Complett Spa | DEVICE AND PROCEDURE FOR CHECKING THE LUGGAGE LENGTH IN SEWING MACHINES WITH POINT TO FILZA. |
-
2016
- 2016-04-28 IT ITUA2016A002958A patent/ITUA20162958A1/en unknown
-
2017
- 2017-04-20 WO PCT/IT2017/000080 patent/WO2017187465A1/en active Application Filing
- 2017-04-20 EP EP17733049.5A patent/EP3449050B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
WO2017187465A1 (en) | 2017-11-02 |
ITUA20162958A1 (en) | 2017-10-28 |
EP3449050B1 (en) | 2023-11-08 |
EP3449050C0 (en) | 2023-11-08 |
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