CN104233586B - For controlling the device and method of petinet warp thread on a kind of loom - Google Patents
For controlling the device and method of petinet warp thread on a kind of loom Download PDFInfo
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- CN104233586B CN104233586B CN201410469489.7A CN201410469489A CN104233586B CN 104233586 B CN104233586 B CN 104233586B CN 201410469489 A CN201410469489 A CN 201410469489A CN 104233586 B CN104233586 B CN 104233586B
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Abstract
The invention discloses on a kind of loom for controlling the device and method of petinet warp thread, belong to the braiding apparatus technical field of textile industry.Described device includes multiple heald frame, support, the first heald, the second heald, two-way support, connection rod set and dobby；First heald and the second heald front and back in pairs are rack-mount；Support side by side parallel is arranged, and is connected with heald frame；Heald frame lower and upper cross-member is connected to multiple wooden frame；Heald frame is arranged in the baffle plate of loom both sides；Heald frame is connected with connection rod set；Connection rod set is connected with dobby；It is provided with two-way support, the first heald and the second heald between adjacent heald frame and is each passed through two-way support；Two-way support is connected with the lower and upper cross-member of loom respectively by nylon6 chips and spring.Present invention also offers a kind of method for controlling petinet warp thread.The present invention has the weaving at a high speed of applicable low count yarn line, opening is clear and avoids scratching the advantages such as yarn, and structural design is simple, reasonable.
Description
Technical field
The present invention relates to the braiding apparatus technical field of textile industry, particularly to a kind of loom is used for controlling the device and method of petinet warp thread.
Background technology
At present, the device that controls of petinet warp thread is often combined and many elements with adjacent warp thread guide eye equipped with many adjacent each pins with a warp thread guide eye.Warp thread and fixing pin are combined the longitudinal direction combined by pin and are carried out crisscross motion.The element being provided with guide eye guides by the comprehensive lengthwise movement longitudinally carried out of pin and the transverse movement carried out that intersects thereafter in guider.For such equipment, the warp thread guided by said elements alternately moving left and right at pin, alternately weaving about many warp thread continuous movings and continuously warp thread, yarn can be produced abrasion when weaving speed is too high and have the danger of float by swinging of this warp thread, and therefore such device is not suitable for carrying out weaving at a high speed.
Summary of the invention
In order to solve abrasion yarn and the float dangerous problem of loom generation when weaving at a high speed of weaving petinet, the invention provides for controlling the device of petinet warp thread on a kind of loom, including multiple heald frames, support, the first heald, the second heald, two-way support, connection rod set and dobby；Described first heald and the second heald front and back in pairs are installed on the bracket；Described support side by side parallel is arranged, and is connected with described heald frame；Described heald frame lower and upper cross-member is connected to multiple wooden frame；Described heald frame is arranged in the baffle plate of loom both sides；Described heald frame is connected with described connection rod set；Described connection rod set is connected with dobby；Being provided with described two-way support between adjacent heald frame, described first heald and the second heald are each passed through described two-way support；Described two-way support is connected with the lower and upper cross-member of loom respectively by nylon6 chips and spring；Described dobby includes the first armed lever group, slide bar group and the second armed lever group；Described first armed lever group is connected with slide bar group, and described slide bar group is connected with described connection rod set；Described second armed lever group is connected with in the middle part of described slide bar group, is used for supporting described connection rod set；External drive mechanism drives described connection rod set to do by described slide bar group and moves up and down regularly.
Described first heald and the second heald are combined by two foundation and " U " type leno heald is constituted；Described two foundation are combined and are respectively mounted on the bracket, and described two foundation are combined two ends and all had base to combine heald end loop；There is leno heald harness eye described " U " type leno heald upper end, and described " U " type leno heald two-arm end has leno heald heald end loop, and described " U " type leno heald straddles described two foundation to sum up；The leno heald heald end loop opposite direction each other of described first heald and the second heald.
Described first armed lever group includes many first armed levers being arranged side by side；Described slide bar group includes the many slide bars being arranged side by side；Described second armed lever group includes many second armed levers being arranged side by side；Correspondingly, described connection rod set includes the many connecting rods being arranged side by side；The quantity of described first armed lever, slide bar, the second armed lever and connecting rod is all equal.
Being provided with multiple groove in described loom two side shield, described heald frame is installed in described groove.
The thickness of described wooden frame is more than the thickness of described heald frame.
Present invention also offers a kind of method for controlling petinet warp thread on loom, including: warp thread is divided into rotation warp thread group and static warp thread group from warp beam extraction, and passes sequentially through warp stop sheet in order；Described static warp thread group is introduced into the harness eye of " U " type leno heald of the second heald, the neutral gear that two foundation through the first heald are combined, and enters between the sliding part of reed；The neutral gear that two foundation of described rotation warp thread group described second heald of traverse are combined, is introduced into the harness eye of " U " type leno heald of described first heald, enters between the sliding part of described reed；It is collectively forming doup end tissue in described rotation warp thread group and the static warp thread group each groove between sliding part.
The device and method controlling warp thread that loom for weaving petinet provided by the invention uses, has the at a high speed weaving of applicable low count yarn line, opening is clear and avoids scratching the advantages such as yarn, and structural design is simple, rationally；By at the support of heald frame and make the two-way support of compensating action is installed first, second special heald with spring, under the drive of dobby, heald frame carries out regular up and down motion on the direction being perpendicular to warp thread horizontal plane, drive the shaft raising campaign of first, second heald, make rotation warp thread in static warp thread left and right twisting, thus having reached safe and reliable high speed weaving, and heald frame stable operation in the groove of loom two side shield, broken string not easily occurs, reduces because swinging the danger producing float.
Accompanying drawing explanation
Fig. 1 is the petinet schematic diagram that the embodiment of the present invention provides；
Fig. 2 is the loom overall structure schematic diagram being provided with embodiment of the present invention device；
Fig. 3 is embodiment of the present invention warp device partial structurtes schematic diagram；
Fig. 4 is the connected mode schematic diagram of embodiment of the present invention heald and heald frame and warp thread；
Fig. 5 a is the element schematic of the embodiment of the present invention the first heald；
Fig. 5 b is the element schematic of the embodiment of the present invention the second heald；
Fig. 6 is the overall schematic that the embodiment of the present invention forms open shed；
Fig. 7 is the partial schematic diagram that the embodiment of the present invention forms open shed；
Fig. 8 is the overall schematic that the embodiment of the present invention forms flat shed open；
Fig. 9 is the partial schematic diagram that the embodiment of the present invention forms flat shed open；
Figure 10 is the overall schematic that embodiment of the present invention formation strand turns shed open；
Figure 11 is the partial schematic diagram that embodiment of the present invention formation strand turns shed open；
Figure 12 is the structural representation of embodiment of the present invention multi-arm linkage.
Detailed description of the invention
Below in conjunction with drawings and Examples, technical solution of the present invention is further described.
The characteristic of petinet results from intertwined point, twists the different configuration knitting characteristic, and the intertexture of yarn can be realized by two kinds of mutual turns of warp thread, from without making weft yarn and warp yarns；In each weave cycle, warp thread group be all a warp thread upper, warp thread under, warp thread produces interleaving effect not by phase interchangeable upper-lower position, but produces interleaving effect by mutual turn.Therefore, warp thread is typically divided into two groups, including static warp thread group 15 and rotation warp thread group 14 (as shown in Figure 1), makes them produce left and right turn motion alternately by special warp thread controlling organization.
The device controlling warp thread that the present embodiment uses for the loom weaving petinet, have employed and combined, by two foundation, the heald constituted with " U " type leno heald, including the first heald and the second heald.Fig. 2 is the loom overall structure schematic diagram being provided with many basic embodiment healds along loom width equably.First heald 1 of the present embodiment and the second heald 1 ＇ combine 2 and " U " type leno heald composition by two foundation；Two foundation combine two ends all has base to combine heald end loop；There is leno heald harness eye " U " type leno heald upper end, and " U " type leno heald two-arm end has leno heald heald end loop, and " U " type leno heald straddles two foundation to sum up；The difference of the first heald 1 and the second heald 1 ＇ is in that: (the leno heald heald end loop of " U " type leno heald 3 is directed downward the leno heald heald end loop opposite direction each other of " U " type leno heald 3 of the first heald 1 and " U " type leno heald 3 ＇ of the second heald 1 ＇, the leno heald heald end loop of " U " type leno heald 3 ＇ is directed upwardly), as shown in figure 5 a and 5b.As shown in Figure 4, the first heald and the second heald front and back in pairs are placed；Two foundation of the second heald are combined and are separately mounted on support 41,42, and two foundation of the first heald are combined and are separately mounted on support 43,44；Support 41,42,43,44 side by side parallel is arranged, and is separately fixed in order on heald frame 51,52,53,54.In actual applications, the quantity of support and heald frame can, according to design needs, arrange arbitrarily paired multiple；Support can adopt movable connection method, facilitates dismounting and change.
As shown in Figures 2 and 3, before and after heald frame 51,52,53,54 side by side parallel place (the present embodiment sets into the direction of warp thread and the back rest be front to, weave the direction of cloth be rear to), the lower and upper cross-member of each heald frame is respectively connected with multiple rectangle wooden frame 6, the thickness of wooden frame 6 more than the thickness of heald frame to prevent integrated box movement time mutually produce friction.As shown in Fig. 2 and Figure 12, heald frame extends to the whole width of loom, is arranged in the baffle plate 231 of loom both sides in the multiple grooves arranged, and is connected with connection rod set 7 by hook folder, and connection rod set 7 is moved by the driving of dobby 8.
As shown in Figures 2 and 3, two-way support 91 is arranged between heald frame 51 and heald frame 52, two-way support 91 is through the leno heald heald end loop of " U " type leno heald 3 ＇ of the second heald 1 ＇, and two-way support 91 is connected with nylon6 chips 10 by screw, and nylon6 chips 10 is connected in the metal beam 121 of top by spring 11；Two-way support 92 is arranged between heald frame 53 and 54, and two-way support 92 is through the leno heald heald end loop of " U " type leno heald 3 of the first heald 1, and two-way support 92 is connected with nylon6 chips 10 by screw, and nylon6 chips 10 passes through in the metal beam 122 that spring 11 is attached below.Metal beam extends to the whole width of loom, and is fixed in the avris framework (not shown) of loom.Spring 11 is arranged in metal beam according to spacing equably.
As indicated in figs. 2 and 12, driving mechanism drives dobby 8 to move both vertically up and down in a plane, and dobby 8 includes the first armed lever group 80, slide bar group 81 and the second armed lever group 82；First armed lever group 80 is connected with slide bar group 81, and slide bar group 81 is connected with connection rod set 7；Second armed lever group 82 is connected with in the middle part of slide bar group 81, for support link group 7；External drive mechanism drives connection rod set 7 to do by slide bar group 81 and moves up and down regularly.First armed lever group 80 includes many first armed levers being arranged side by side；Slide bar group 81 includes the many slide bars being arranged side by side；Second armed lever group 82 includes many second armed levers being arranged side by side；Correspondingly, connection rod set 7 includes the many connecting rods being arranged side by side；The quantity of the first armed lever, slide bar, the second armed lever and connecting rod is all equal.In the present embodiment, the first armed lever group 80 includes 4 first armed levers, slide bar group 81 includes 4 slide bars, the second armed lever group 82 includes 4 second armed levers, and connection rod set 7 includes 4 connecting rods；First armed lever connects slide bar, slide bar connects connecting rod, the second armed lever is connected with in the middle part of slide bar, for support link.The entablature of each heald frame or sill are respectively connected with connection rod set 7 one group fixing, and in the present embodiment, the sill of each heald frame is respectively connected with connection rod set 7 one group fixing.Heald frame is being perpendicular to the move in plane of warp thread horizontal plane.The regular movement of dobby is mainly controlled by mechanical type card reading device, and this device is that, atresia porose by probe Active searching card transmits information, and porose then heald frame rises, and atresia then heald frame declines.By designing this card, the forms of motion of dobby changes, the heald frame rise and fall fluctuating rule driven including dobby and the persistent period etc. of rise and fall, these changes can affect the strand rotating warp thread and the formation of static warp thread and turn the formation of shed open, open shed, flat shed open, thus forming special petinet.
As shown in Figures 1 to 4, the present embodiment includes for the method controlling petinet warp thread: warp thread is brought out from warp beam by the back rest 13, from the back rest forward, warp thread is divided into rotation warp thread group and static warp thread group, warp thread passes sequentially through warp stop sheet 16 in order, the compensation device that warp stop sheet 16 changes for warp tension；Static warp thread group is first introduced into the harness eye of " U " type leno heald of the second heald, then passes through the neutral gear that two foundation of the first heald are combined, finally enters between the sliding part of reed 241；Rotate warp thread group initially pass through the second heald two foundation combine neutral gear, be then directed into the harness eye of " U " type leno heald of the first heald, finally enter and static warp thread group share reed 241 sliding part between.Warp thread in warp beam introduces warp control device successively in a manner described, each groove between the sliding part of reed just can receive in each group respectively and rotate warp thread and a static warp thread, the warp thread guided in each groove between sliding part is collectively forming a doup end tissue, as long as introducing weft yarn 19, so that it may produce petinet.
Under the regular driving of dobby 8, heald frame 54,52 rises, and heald frame 53,51 declines, and the support that heald frame connects also rises or falls accordingly, and namely support 44,42 rises, and support 43,41 declines.Support 44 drives the base of the first heald to combine 24 risings, straddles comprehensive " U " the type leno heald of base and rises along with base combines 24, and base is combined 23 and declined under the drive of support 43.In like manner, support 41 drives the base of the second heald to combine 21 declines, straddles comprehensive " U " the type leno heald of base and declines along with base combines 21, and base is combined 22 and risen under the drive of support 42.These actions finally make the warp thread that rotates penetrating the harness eye of " U " type leno heald of the first heald rise to peak along with the rising of the first heald, the static warp thread of the harness eye penetrating " U " type leno heald of the second heald drops to minimum point along with the decline of the second heald, and rotate warp thread and rise on the right side of static warp thread group, rotate warp thread 14 and there is no twisting with static warp thread 15, define open shed clearly, wherein the warp thread bottom surface of open shed is to be formed by static warp thread 15, the warp thread end face of open shed is to be formed by rotation warp thread 14, as shown in Figure 6 and Figure 7.Now, bringer sword carries weft yarn and enters shed open, connects latitude sword and receives the weft yarn on bringer sword, completes the beating-up of open shed.Subsequently, heald frame 54,52 declines, and heald frame 53,51 rises, and the support that heald frame connects is also down or up to such as the relevant position of Fig. 8 and Fig. 9 accordingly；Simultaneously under the effect of spring 11, the second heald on two-way support 91 and the first heald Rapid reset on two-way support 92, form flat shed open.Support 43 drives the base of the first heald to combine 23 risings, straddles comprehensive " U " the type leno heald of base and rises along with base combines 23, and base is combined 24 and declined under the drive of support 44；In like manner, support 42 drives the base of the second heald to combine 22 declines, straddles the comprehensive U-shaped leno heald of base and declines along with base combines 22, and base is combined 21 and risen under the drive of support 41.These actions finally make the warp thread that rotates penetrating the harness eye of " U " type leno heald of the first heald be torqued into the left side of static warp thread, and rise to peak along with the rising of the first heald, the static warp thread of the harness eye penetrating " U " type leno heald of the second heald drops to minimum point along with the decline of the second heald, owing to rotating warp thread and static warp thread generation twisting, right position is alternate with each other, define strand clearly and turn shed open, wherein strand turns the warp thread bottom surface of shed open is formed by static warp thread 15, it is formed by rotation warp thread 14 that strand turns the warp thread end face of shed open, as shown in Figure 10 and Figure 11.Now, bringer sword carries weft yarn and enters shed open, connects latitude sword and receives the weft yarn on bringer sword, completes to twist the beating-up turning shed open.Subsequently, heald frame 53,51 declines, and heald frame 54,52 rises, and the support that heald frame connects is also down or up to such as the relevant position of Fig. 8 and Fig. 9 accordingly；Simultaneously under the effect of spring 11, the second heald on two-way support 91 and the first heald Rapid reset on two-way support 92, form flat shed open.
When producing petinet, open shed and strand turn the motion alternate repetition of shed open and carry out, and when clear shed open is formed every time, carry out picking movement, that is: warp thread is rotated always alternately through the left and right sides of static warp thread, and when the static warp thread left and right sides rises to peak, weft yarn beats up, thus forming petinet tissue.
In the present embodiment, leno loom is provided with the two set healds being made up of the first heald and the second heald, and often set heald needs to be fixed on two row's heald frames.Similar, the heald of three sets or more set according to the warp count in weaving process and total number parameter designing, can be set for Warp Tension Test, correspondingly, heald frame is into the setting of multiple.
Although preferably in the heald being evenly arranged the present embodiment in loom width range but it also may the density regulating the present embodiment heald according to demand in the width range of loom is arranged to reach different spacing, and this can form special petinet.
Under any circumstance, one rotates warp thread and a pair warp thread group that static warp thread forms can be guided by a set of the present embodiment heald, it will be clear that two or more warp thread can be guided by specific the present embodiment heald, this can form special petinet.
The device controlling warp thread that the present embodiment uses for the loom weaving petinet, has the advantage that
1 heald contacted with warp thread is moved by the shed open of two groups of regular standards that achieve that move both vertically up and down of heald frame, this driving mechanism moved both vertically, it is possible to be arranged on the upper and lower of heald frame, directly forms space greatly and clearly shed open.In being configured with the element of many guide eyes and the comprehensive device of pin with guide eye, the element of guide eye is except the longitudinal direction combined by pin completes lengthwise movement, also completing transverse movement by the transverse direction that pin is combined, loom operating frequency will be produced percussion by the motion of the element complexity of guide eye.Compared to being configured with the element of many guide eyes and the comprehensive device of pin with guide eye, the embodiment of the present invention adopts the control device of special construction heald, simplifies driving mechanism, improves the accuracy of action.
2, in order to prevent static warp thread from embedding when two foundation combine up-down alternative motion between U-shaped leno heald and base combine, affect turn motion, the embodiment of the present invention is provided with U-shaped leno heald and the comprehensive combination of base of two groups of different structures especially, forms the first heald and the form of the second heald respectively.The heald of two groups of different structures drives warp thread can realize upper and lower opening and twisting motion.Owing to the heald of two groups of different structures is separately fixed on heald frame by support, under the drive of the heald frame risen and fallen, each doing knee-action without interfering with each other, therefore often group warp thread is all relatively independent non-interfering；Compared to being configured with the element of many guide eyes and the comprehensive device of pin with guide eye, do not have not press close to due to the warp thread in guide eye and combine position at hard-wired pin, and cause that pin is combined the danger that swings caused and combined the phenomenon of yarn fluffing of wearing and tearing with pin.
The device and method controlling warp thread used for the loom weaving petinet that the embodiment of the present invention provides, has the weaving at a high speed of applicable low count yarn line, opening is clear and avoids scratching the advantages such as yarn, and structural design is simple, rationally；By at the support of heald frame and make the two-way support of compensating action is installed first, second special heald with spring, under the drive of dobby, heald frame carries out regular up and down motion on the direction being perpendicular to warp thread horizontal plane, drive the shaft raising campaign of first, second heald, make rotation warp thread in static warp thread left and right twisting, thus having reached safe and reliable high speed weaving, and heald frame stable operation in the groove of loom two side shield, broken string not easily occurs, reduces because swinging the danger producing float.
Particular embodiments described above; the purpose of the present invention, technical scheme and beneficial effect have been further described; it is it should be understood that; the foregoing is only specific embodiments of the invention; it is not limited to the present invention; all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (6)
1. for controlling the device of petinet warp thread on a loom, it is characterised in that include multiple heald frame, support, the first heald, the second heald, two-way support, connection rod set and dobby；Described first heald and the second heald front and back in pairs are installed on the bracket；Described support side by side parallel is arranged, and is connected with described heald frame；Described heald frame lower and upper cross-member is connected to multiple wooden frame；Described heald frame is arranged in the baffle plate of loom both sides；Described heald frame is connected with described connection rod set；Described connection rod set is connected with dobby；Being provided with described two-way support between adjacent heald frame, described first heald and the second heald are each passed through described two-way support；Described two-way support is connected with the lower and upper cross-member of loom respectively by nylon6 chips and spring；Described dobby includes the first armed lever group, slide bar group and the second armed lever group；Described first armed lever group is connected with slide bar group, and described slide bar group is connected with described connection rod set；Described second armed lever group is connected with in the middle part of described slide bar group, is used for supporting described connection rod set；External drive mechanism drives described connection rod set to do by described slide bar group and moves up and down regularly.
2. for controlling the device of petinet warp thread on loom as claimed in claim 1, it is characterised in that described first heald and the second heald are combined by two foundation and " U " type leno heald is constituted；Described two foundation are combined and are respectively mounted on the bracket, and described two foundation are combined two ends and all had base to combine heald end loop；There is leno heald harness eye described " U " type leno heald upper end, and described " U " type leno heald two-arm end has leno heald heald end loop, and described " U " type leno heald straddles described two foundation to sum up；The leno heald heald end loop opposite direction each other of described first heald and the second heald.
3. for controlling the device of petinet warp thread on loom as claimed in claim 1, it is characterised in that described first armed lever group includes many first armed levers being arranged side by side；Described slide bar group includes the many slide bars being arranged side by side；Described second armed lever group includes many second armed levers being arranged side by side；Correspondingly, described connection rod set includes the many connecting rods being arranged side by side；The quantity of described first armed lever, slide bar, the second armed lever and connecting rod is all equal.
4. for controlling the device of petinet warp thread on loom as claimed in claim 1, it is characterised in that being provided with multiple groove in described loom two side shield, described heald frame is installed in described groove.
5. for controlling the device of petinet warp thread on loom as claimed in claim 1, it is characterised in that the thickness of described wooden frame is more than the thickness of described heald frame.
6. the method being used on a loom controlling petinet warp thread, it is characterised in that including: warp thread is drawn from warp beam and is divided into rotation warp thread group and static warp thread group, and passes sequentially through warp stop sheet in order；Described static warp thread group is introduced into the harness eye of " U " type leno heald of the second heald, the neutral gear that two foundation through the first heald are combined, and enters between the sliding part of reed；The neutral gear that two foundation of described rotation warp thread group described second heald of traverse are combined, is introduced into the harness eye of " U " type leno heald of described first heald, enters between the sliding part of described reed；It is collectively forming doup end tissue in described rotation warp thread group and the static warp thread group each groove between sliding part.
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| CN105256433A (en) * | 2015-10-10 | 2016-01-20 | 浙江丝绸科技有限公司 | Novel drafting method for weaving lenos on digital rapier loom and leno heald combined returning device adopted in method |
| CN106087205A (en) * | 2016-08-11 | 2016-11-09 | 江苏华跃纺织新材料科技有限公司 | A kind of polytetrafluoroethylfilament filament leno heald structure filtrate base fabric and preparation method thereof |
| CN106757648A (en) * | 2017-02-24 | 2017-05-31 | 安徽京九丝绸股份公司 | A kind of kimonos twists side leno heald driving structure |
| KR101960640B1 (en) * | 2018-09-17 | 2019-03-20 | 주식회사 석영텍스타일 | Guide device of Leno heald loom |
| CN109554807A (en) * | 2018-10-10 | 2019-04-02 | 浙江丝绸科技有限公司 | A kind of braiding method and device of yardage Turkey gauze |
| CN110499567A (en) * | 2019-09-05 | 2019-11-26 | 山东天睿玻纤复合材料有限公司 | A kind of strand loom structure of electromagnetic drive |
| CN114787436B (en) * | 2019-11-26 | 2024-05-24 | 洛希亚有限公司 | Circular loom for producing leno heddle fabrics and method for producing leno heddle fabrics |
| CN114016180B (en) * | 2021-10-20 | 2024-05-28 | 南京望天科技有限公司 | Leno heald capable of automatically resetting |
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|---|---|---|---|---|
| GB984531A (en) * | 1961-02-14 | 1965-02-24 | Alsacienne Constr Meca | Means for forming selvedges on woven fabric |
| GB1025233A (en) * | 1961-10-11 | 1966-04-06 | Alsacienne Constr Meca | Improvements in looms |
| CN86204035U (en) * | 1986-08-29 | 1987-07-01 | 李志和 | Two skeined heald leno flat metal heald |
| CN2172771Y (en) * | 1993-09-29 | 1994-07-27 | 潍坊第四棉纺织厂 | Guide plate of loom heald frame |
| CN101476191A (en) * | 2007-11-21 | 2009-07-08 | 格罗兹-贝克特公司 | Apparatus for the production of leno fabric |
| CN204151518U (en) * | 2014-09-15 | 2015-02-11 | 北京五洲燕阳特种纺织品有限公司 | For controlling the device of LENO AND GAUZE warp thread on a kind of loom |
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|---|---|
| CN104233586A (en) | 2014-12-24 |
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