EP2948581A1 - Embroidery machine having at least one lockstitch rotating hook - Google Patents
Embroidery machine having at least one lockstitch rotating hookInfo
- Publication number
- EP2948581A1 EP2948581A1 EP14707642.6A EP14707642A EP2948581A1 EP 2948581 A1 EP2948581 A1 EP 2948581A1 EP 14707642 A EP14707642 A EP 14707642A EP 2948581 A1 EP2948581 A1 EP 2948581A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- embroidery
- thread
- stitch
- needle
- stitching
- 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
- 230000033001 locomotion Effects 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 25
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims description 14
- 230000009467 reduction Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 14
- 238000010586 diagram Methods 0.000 description 14
- 230000008859 change Effects 0.000 description 8
- 239000004744 fabric Substances 0.000 description 5
- 238000009958 sewing Methods 0.000 description 5
- 238000003780 insertion Methods 0.000 description 4
- 230000037431 insertion Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000009956 embroidering Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
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- 238000012790 confirmation Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B19/00—Programme-controlled sewing machines
- D05B19/02—Sewing machines having electronic memory or microprocessor control unit
- D05B19/12—Sewing machines having electronic memory or microprocessor control unit characterised by control of operation of machine
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05C—EMBROIDERING; TUFTING
- D05C11/00—Devices for guiding, feeding, handling, or treating the threads in embroidering machines; Machine needles; Operating or control mechanisms therefor
- D05C11/08—Thread-tensioning arrangements
Definitions
- the invention relates to an embroidery machine with at least one embroidery head, which is provided with stitch forming tools for stitch formation of a stitching, wherein the stitch forming tools provided for guiding a needle upper needle and a cooperating with the needle to form stitches circumferential gripper, the gripper with a receptacle for Arrangement of a lower thread supply is provided and during a Stichchanezyklus preferably rotates more than twice about its axis of rotation, and movement means for carrying out feed relative movements between the needle and an embroidery material is provided.
- lockstitch grippers are used in the majority of cases, as they are generally used in sewing machines. Such a lockstitch gripper executes two full revolutions per stitch pattern period in embroidery machines. In DE 10 2010 013 016 A1, it is proposed that the lockstitch gripper also execute more than two full revolutions during a stitch formation period.
- Such a stitch formation period which can also be referred to as a stitch formation cycle, is characterized by the fact that the main shaft of the main shaft driving the needle bar and needle makes one complete revolution through 360 °.
- CONFIRMATION COPY The strength of the fastening seam is achieved in that the dropped from the gripper thread loop is pulled by the thread lever with relatively large force in the direction of the top of the fabric, so that the entanglement of needle and looper thread comes to rest centrally between the fabric layers to be sewn. Accordingly, the thread force of the looper thread is dimensioned.
- this modified kinematics can prevent the aspects which lead to a thread tension that is system-related in the case of 2-speed grippers.
- this can be the picking machine with typical sewing machine kinematics adapted to the particular requirements of an embroidery machine.
- satin stitches at each stitch corresponds to the lower thread length in about the upper thread length. Satin stitches, which have a zig-zag pattern of the seam, are used primarily for the design of surface patterns.
- the stitching produced with satin stitches typically has a change in direction of the upper thread orientation after each stitch.
- the lower thread extends on the underside of the embroidery base from one puncture of the needle to the next puncture of the needle in the embroidery bottom.
- the lower thread thus extends from one immediately below a puncture arranged Upper thread loop to the next upper thread loop, which is also located just below her puncture of the needle in the embroidery bottom.
- the invention is therefore an object of the invention to provide a measure by which can extend the change intervals for the bobbin in embroidery machines of the type mentioned.
- an embroidery machine of the type mentioned by means of the embroidery machine for adjustable variation of at least one parameter of the stitch formation process, through which different values of the stitch seam, at least during one, preferably during each stitch pattern periods of a plurality of stitch pattern periods Give parameters to thereby produce a non-congruent arrangement of upper and lower thread on the embroidery in relation to the position and length of the lower and upper thread of a stitch of the stitching at the top and bottom of the embroidery.
- the object is also achieved by means for reducing a thread tension of the upper thread of the embroidery machine at a predeterminable time Stichchanezyklus solved.
- the object is also achieved by an embroidery method according to claim 12 and by an embroidery product according to claim 15.
- the invention overcomes the longstanding prevailing view in connection with Qreiferstickmaschinen that only their kinematics determines the lower thread amount, especially in satin stitches.
- at least one parameter of the embroidery process which can be influenced by the embroidery machine is changed during the execution of the embroidery process - in particular during each stitching cycle - due to at least one control operation of the embroidery machine.
- This change should be made in a predetermined manner, which is done by the machine itself, for example due to an adjustment previously made on the embroidery machine or programming.
- the setting to be controlled or regulated on the basis of and as a function of a detection result determined by the machine of an actual value of the at least one parameter.
- the parameter of the embroidery process which is specifically varied during a stitch formation cycle, can advantageously be a thread tension or an influencing factor influencing the thread tension of the embroidery method.
- the amount of underneath thread assigned to a particular stitch length can be shortened even by variation of the size of instantaneous values of a parameter of the embroidery method that is deliberately made in terms of time and amount. This can be done in particular by a reduction of values of at least one parameter during a phase of the stitch formation period, compared to values of the respective parameter in a phase of the same stitch formation period preceding this phase.
- the variation of the at least one parameter always takes place in an identical manner.
- the means according to the invention thus act in a manner by which the upper thread loop receiving the lower thread on the underside of the embroidery base is arranged at a distance from the passage point of the upper thread through the embroidery material at a distance from the respective upper thread loop at the latest after completion of the respective stitch formation.
- the upper thread with its loop should no longer be arranged directly below the respective puncture point of the needle in the embroidery material in the case of the finished satin stitch stitching formed with a gripper more than twice round. Rather, it is provided that the upper thread loop is arranged at the latest after stitch or seam formation between in each case two consecutive puncture sites. As a result, the length of bobbin thread required for seam formation can be significantly reduced at each seam. The bobbin thread no longer runs from i in the case of satin stitches
- the invention can also for other reasons than the reduction of the lower thread consumption lead to benefits, even with straight running seams and with grippers that rotate only twice per stitch cycle.
- the measure provided according to the invention leads to a shortening of the required amount of lower thread in satin stitches. However, it requires compensation for this an increased amount of upper thread. However, the latter is due to the much larger and practically arbitrarily large coils for the upper thread in relation to the length of the required change intervals for thread bobbins of minor importance.
- Conventional bobbins allow to store a significant amount of upper thread on the embroidery machine, as is possible with bobbins.
- the invention can be used except in satin stitches with other stitches with advantage application, especially if the upper thread sections successive stitches or the associated puncture sites are not on a straight lines but include a deviating from 180 ° angle.
- a preferred embodiment of the invention is in satin stitches per stitch - and thus per stitch length between two successive punctures of the needle, only one bobbin thread required, in which the stitch length associated with bobbin thread at most 80% of the stitch length, preferably at most 70%, also preferably at most 60%, and more preferably half the stitch length or less.
- the means for reducing the thread tension on an upper thread brake, the braking effect on the upper thread by the control of the embroidery machine can be reduced to a predetermined, in particular to a variably predeterminable, timing of seam formation or completely canceled.
- a predetermined in particular to a variably predeterminable, timing of seam formation or completely canceled.
- the lower thread sections between the respective contact points of the lower thread with successive Oberfadenschiingen in the stitch sequences are thus significantly shorter than the distance between successive puncture sites of the needle.
- satin stitches which are produced with generic embroidery machines according to the prior art generic method, however, correspond to the intervals of successive puncture sites at least approximately in the lower thread sections. It has proven to be particularly useful if, during a stitching period, the thread tension is reduced or released after a time after the threading of the upper thread has the value zero or almost zero. The latter is the case when the pivotal movement of preferably provided in generic embroidery machines thread lever for the upper thread has reached its top dead center.
- the reduction or removal of the upper thread tension initiated by the machine control takes place at a point in time at which the embroidery bottom is already moving toward the next stitch position.
- the reduction of the upper thread tension should advantageously take place, in particular, between times of the respective stitch formation period at which the upper thread supply has a minimum value and before the embroidery ground stops again after movement has taken place with its movement.
- the upper thread tension should preferably be increased again at a time when or after the needle, in its subsequent puncture in the
- Fig. 1 is a partial view of a front portion of an embroidery head with a
- Fig. 2 A representation of the situation during the embroidery process, as at the time
- FIG. 3 shows a path-time diagram of the stitching means and the feed device
- Fig. 4 is an illustration of the situation during the embroidery process, as at the time
- Fig. 5 is an illustration of the situation during the embroidery process, as at the time
- FIG. 6 shows an illustration of the situation during the embroidering process, as given in the exemplary embodiment according to the invention at time B from FIG. 3;
- FIG. 7 shows an illustration of the situation during the embroidering process, as given in the exemplary embodiment according to the invention at time C from FIG. 3:
- Fig. 8 is a representation of the situation during the embroidery process, as it is given in the embodiment according to the invention at time D of FIG.
- the front part 1 of a conventional embroidery head is shown in sectional view, as in relation to its structural design in connection with the Invention can be used.
- the front part has a lockstitch gripper 2, a table top 3, and a throat plate 4.
- On the table top 3 is the freely movable in two axes embroidery frame 5, in which the embroidery floor or the embroidery material is clamped.
- the lockstitch gripper 2 is of conventional design and has a bobbin case carrier 6 for receiving a bobbin case 7. In the bobbin case 7, the gripper storage receiving coil is rotatably mounted.
- the lockstitch gripper 2 is provided in the embroidery machine with an axis of rotation parallel to the table top 3 or to the embroidery bottom.
- the lockstitch gripper 2 is assigned in each case to a needle 8 carrying needle bar 9, which cooperates with the lockstitch gripper 2.
- the lockstitch gripper 2 and each needle 8 are components of stitch pattern tools, each needle leads to an embroidery thread referred to below as the upper thread.
- the needle bars 9 are received vertically movable in a base frame 10 and are driven in a conventional manner in each case by a driver 11, which transmits the drive movement of the needle drive to the respective needle bar 9.
- a hold-down 12 is further provided per embroidery thread, which is arranged displaceably on the needle bar 9 and is driven by a driver 13.
- driven thread lever 14 is arranged, which is pivotally mounted on an axis 15, which in turn is received in the base frame 10.
- the embroidery head for each of the upper threads on a known and adjustable with respect to their braking thread brake 16, which is fixedly mounted on the front part 1.
- the rear part of the embroidery head not shown is fixedly connected to the machine frame and carries the drives for the needle bar 9, the hold-down 12 and the thread lever 14.
- the rear part of the embroidery head is also connected via a straight guide, not shown, with the front part 1, so that it can be moved within a horizontal plane in the direction of escape of the existing needle bars 9 above the lockstitch gripper 2, wherein in each case a needle bar 9, a hold-down 12 and a thread lever 14 is connected to the respective drive.
- the drive of the aforementioned parts is carried out with the exception of the drive of the lockstitch gripper 2 by a machine main shaft, not shown, the full per stitching period, i. performs a 360 ° rotating movement.
- the aforementioned elements and parts could also be provided with separate drives, which are synchronized with each other electronically.
- Such a coordinated predetermined or predeterminable synchronization of the movements can be carried out in particular by the machine control.
- FIG. 2 is the perspective, pictorial transmission of the abstract situation at time B from the machine diagram according to FIG. 3.
- FIG. 2 a moment of the stitch forming operation and a plurality of stitches of a satin stitch seam, which was produced by the method of DE 10 2010 013 016 A1, are shown.
- This representation relates to the time B in the diagram of FIG. 3.
- the needle 8 is in the region of a top dead center of its oscillating movement.
- the upper thread 25 guided by it is carried out in the embroidery bottom 23 in the form of an upper thread loop by a puncture hole produced immediately before the time shown in FIG. 2 and is located substantially immediately below the puncture hole or the piercing position of the needle 8.
- the lower thread 24 is made the gripper 2 and the hook bobbin out and performed by the upper thread loop 26. This entanglement is due to the non-illustrated and the lockstitch principle underlying process of detecting the upper thread
- the length of the lower thread section between the two in the longitudinal direction of the zig-zag seam staggered injection points 20, 21 thus corresponds at least approximately to the distance between the two puncture sites 20, 21 to each other or the stitch length S.
- the upper thread and the lower thread 24, 25 run on the lower side of the embroidery base in basically the same way.
- the upper thread 25 runs approximately parallel to the lower thread 24, with approximately the same length as the lower thread 24 and likewise from each puncture site to the next puncture site in each case.
- the needle 2 and the fabric hold-down 3 have almost reached the upper vertex of their vertical movement perpendicular to the throat plate 1, which is shown in the diagram of FIG. 3 by the graphs "needle point via stitch plate” and "substance holder via throat plate” at time B 2, which is clamped in the embroidery frame not shown in FIG. 2, which in turn is displaceable parallel to the surface of the throat plate 4 by a separate drive in two axes, has, after the needle 8 and the hold-down 12 have left him in the vertical direction, practically not yet moved.
- the amount of yarn delivery of Fig. 2 is at said time B at zero. Therefore, below the embroidery bottom 23 of the upper thread 25 only the comparatively small upper thread loop 26.
- FIG. 4 shows the situation at time C in the machine diagram according to FIG. 3.
- the most important difference to diagram timing B is that the embroidery bottom 23 has come into motion by its drive. It shifts over the surface of the needle plate 4 counter to the direction of the next needle drop point of the zig-zag seam and has already covered a considerable distance of the stitch length.
- the threading (upper thread) is still at zero during this. Therefore, the small loop 26 ( Figure 2) remains here through the section of the embroidery base 23 is concealed, remains unchanged and further fixes the lower thread 24 on the underside of the embroidery base 23.
- the loop 26 continues to move away with the movement of the embroidery bottom 23 of the needle plate bore 29. Between the small loop 26 and the upper edge of the needle plate bore 29 thereby creates an additional thread requirement in the lower thread 24, in which the lower thread 24 over the upper edge the throat plate bore 29 slides against the resistance of the lower thread brake from the supply of the gripper bobbin 7 is compensated.
- Fig. 5 the time D in the diagram Fig. 3 is illustrated pictorially.
- the new insertion position of the needle 8 above the embroidery bottom 23 is reached.
- the part of the lower thread 24, which is now between the upper edge of the needle plate hole 29 and the small loop 26 above the needle plate 4 corresponds in length to virtually the way that the embroidery base has covered 23 with its movement, ie the stitch length or the Lower thread consumption of the stitch.
- the needle 8 and the fabric hold-down 12 were increasingly lowered vertically above the embroidery bottom 4.
- This need is taken into account with the already slowly starting before the time point D threading, as can be seen from the diagram of FIG.
- the small loop 26 remains unchanged, as well as their importance for the extension of the lower thread 24 during the complete movement phase of the embroidery base 23rd
- the reason for the described Unterfadentone thus lies in the kinematic interaction of the embroidery floor movement with the thread during the time of Stickêtzi, as described in DE 0 2010 013 016 A1, the disclosure of which is hereby fully incorporated by reference.
- the threading is a function of the pivotal position of the thread lever 14 about its pivot axis 15, in which the path of the upper thread 25 on its way from the thread brake 16 (Fig. 1) to the embroidery bottom 23, depending on the pivot position of the thread lever 14, to different lengths For this reason it is prompted. In its uppermost pivot position, this detour is greatest and the threading equal to zero. The maximum amount of threading is at the lowest pivot position of the thread lever 14, the slightest detour in the upper thread 25.
- the threading works based on the upper thread 25 analogous to a buffer memory, from which by the drive kinematics of the thread lever 14 for the needs of Stichstelleorgane, ie the Needle 8 and especially the gripper 2, temporarily additional upper thread 25 is provided with an excess.
- the threading allows the stitch formation, but does not affect them.
- the upper thread 25 borrowed from the threading is again completely returned to the buffer. The threading is back to zero.
- the upper thread consumption from the last embroidery ground movement, was counteracted against the resistance of the upper thread brake 16 from the supply reel of the upper thread 25 by the upward pivotal movement of the thread lever 14.
- the state of FIG. 2 has arisen.
- FIG. 6 shows, on the basis of the work result obtained according to the invention, the situation in the machine diagram according to FIG. 3 at time B, that is to say at the time when the threading reaches zero.
- This representation is in close analogy to FIG. 2, the description of which therefore also applies in principle to FIG. 6 and will not be repeated.
- FIG. 7 the conditions in the machine diagram according to FIG. 3 are shown at time C, that is to say at a time after the value zero of the thread feed has been reached.
- time C that is to say at a time after the value zero of the thread feed has been reached.
- bobbin thread is removed from the bobbin supply of the lockstitch round-off gripper 2 by the movement of the embroidery bottom 4.
- the embodiment of the method according to the invention and a device according to the invention which is discussed here causes the yarn brake 16 of the upper thread 25 to be open from time C in FIG. 3.
- an actuator is in principle any known actuator suitable, with which the embroidery machine is capable, according to the usual in embroidery machines speeds of Machine shaft to open the thread brake 16 and subsequently close again.
- Such an actuator may be in a non-exhaustive list, for example, a solenoid, a piezo or a pneumatic element.
- FIG. 8 shows, like FIG. 5, the situation at time D in the machine diagram FIG. 3.
- the movement of the embroidery base 23 is ended.
- the formerly small needle thread loop 26 is enlarged to the now larger needle thread loop 26a by upper thread 25 is pulled by the further braked lower thread 24 on the underside of the embroidery base 23.
- the piece of thread or the thread portion 24a of the lower thread 24 is significantly smaller than the stitch length S and represents the lower thread consumption between the last two stitches.
- the separated by the embroidery bottom 23 course of the upper thread 24 and the lower thread 24 on the embroidery is now no longer congruent , in contrast to the situation according to FIG. 2.
- the bobbin thread length can be specifically influenced via the machine control. This influence can be made, above all, by varying the time C entered in FIG. 3 by way of example at a specific point in time. Depending on the time at which C between the points B and D in Fig. 3, the upper thread brake has been opened, the length of the upper thread drawn to the bottom and thus the required per stitch bobbin thread length can be varied. If the opening happens earlier, the bobbin thread portion is lower and vice versa. Since the threading can assume the value zero or almost zero not only at a single point in time but during a time interval of the stitching period, also the point in time B as a possible point in time from this interval can be selected.
- the type of embroidery to be produced can now decide whether the upper and lower thread should be congruent with each other in the case of translucent embroidery bottom - high under thread consumption - or, if that is not necessary, which predetermined fraction of the stitch length the corresponding lower thread consumption has - lower lower thread consumption , This choice is not given in Greiferstickmaschinen with double-rotating gripper.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013001346.1A DE102013001346A1 (en) | 2013-01-28 | 2013-01-28 | Embroidery machine with at least one lockstitch circular gripper |
PCT/EP2014/000216 WO2014114468A1 (en) | 2013-01-28 | 2014-01-28 | Embroidery machine having at least one lockstitch rotating hook |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2948581A1 true EP2948581A1 (en) | 2015-12-02 |
EP2948581B1 EP2948581B1 (en) | 2022-11-30 |
Family
ID=50193434
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14707642.6A Active EP2948581B1 (en) | 2013-01-28 | 2014-01-28 | Embroidering machine with at least one rotating loop taker for two-thread lock stitch |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2948581B1 (en) |
JP (1) | JP6533160B2 (en) |
CN (1) | CN105283596B (en) |
DE (1) | DE102013001346A1 (en) |
WO (1) | WO2014114468A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109097923A (en) * | 2018-10-22 | 2018-12-28 | 向康城 | A kind of embroidery machine and its embroidering method |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS622998A (en) * | 1985-06-28 | 1987-01-08 | 蛇の目ミシン工業株式会社 | Automatic stitch balancing thread tension sewing machine |
DE3836472C2 (en) * | 1987-10-31 | 1995-08-17 | Juki Kk | Upper thread feed mechanism for sewing machines |
EP0756031B1 (en) * | 1995-07-26 | 1998-07-01 | Franz Lässer AG | Thread guiding device for schiffli embroidery machine |
EP1921193A2 (en) * | 2006-11-10 | 2008-05-14 | BERNINA International AG | Method and device for modifying embroidery patterns |
JP2009045207A (en) * | 2007-08-20 | 2009-03-05 | Yamato Sewing Mach Co Ltd | Stitch balancing thread tension device of sewing machine |
KR101411786B1 (en) * | 2009-06-16 | 2014-06-24 | 엔에스디 가부시끼가이샤 | Lower-thread tension control device for sewing machine, and sewing machine |
DE102010013016A1 (en) | 2010-03-24 | 2011-09-29 | Zoje Europe Gmbh | Single or multi-head embroidery machine with lockstitch circular gripper |
-
2013
- 2013-01-28 DE DE102013001346.1A patent/DE102013001346A1/en not_active Withdrawn
-
2014
- 2014-01-28 WO PCT/EP2014/000216 patent/WO2014114468A1/en active Application Filing
- 2014-01-28 EP EP14707642.6A patent/EP2948581B1/en active Active
- 2014-01-28 JP JP2015554090A patent/JP6533160B2/en not_active Expired - Fee Related
- 2014-01-28 CN CN201480017804.0A patent/CN105283596B/en not_active Expired - Fee Related
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2014114468A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2948581B1 (en) | 2022-11-30 |
JP2016504124A (en) | 2016-02-12 |
CN105283596A (en) | 2016-01-27 |
CN105283596B (en) | 2020-07-28 |
DE102013001346A1 (en) | 2014-07-31 |
JP6533160B2 (en) | 2019-06-19 |
WO2014114468A1 (en) | 2014-07-31 |
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