EP2664700A1 - Métiers à tisser avec came pour égaliser la tension des fils de chaîne - Google Patents
Métiers à tisser avec came pour égaliser la tension des fils de chaîne Download PDFInfo
- Publication number
- EP2664700A1 EP2664700A1 EP13164842.0A EP13164842A EP2664700A1 EP 2664700 A1 EP2664700 A1 EP 2664700A1 EP 13164842 A EP13164842 A EP 13164842A EP 2664700 A1 EP2664700 A1 EP 2664700A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- warp yarns
- heald
- shed
- cam mechanism
- modified cam
- 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.)
- Withdrawn
Links
- 238000009941 weaving Methods 0.000 title claims abstract description 46
- 230000007246 mechanism Effects 0.000 claims abstract description 38
- 238000010009 beating Methods 0.000 claims abstract description 18
- 230000006872 improvement Effects 0.000 claims abstract description 16
- 230000001360 synchronised effect Effects 0.000 claims abstract description 6
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 230000004048 modification Effects 0.000 claims description 11
- 238000012986 modification Methods 0.000 claims description 11
- 239000004744 fabric Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
- D03C5/00—Cam or other direct-acting shedding mechanisms, i.e. operating heald frames without intervening power-supplying devices
- D03C5/02—Cam or other direct-acting shedding mechanisms, i.e. operating heald frames without intervening power-supplying devices operated by rotating cams
- D03C5/04—Construction or shape of cams
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D49/00—Details or constructional features not specially adapted for looms of a particular type
- D03D49/04—Control of the tension in warp or cloth
- D03D49/12—Controlling warp tension by means other than let-off mechanisms
- D03D49/14—Compensating for tension differences during shedding
Definitions
- the present invention relates to an improvement in heald frame movement in weaving machines to improve the weave ability. More particularly, the present invention relates to a heald frame movement using a modified cam mechanism. Further, the present invention relates to an improvement in the weave ability of yarns with near zero elasticity at high speeds without creating high peak tensions.
- Warp and filling yarns interlace with each other at right angles to form a weave.
- Weaving is done using a loom to interlace two sets of yarns to each other.
- Conventional loom uses weft yarns carried on a pirn in a shuttle that passes through the shed. The shuttle is propelled by moving it from side to side with the help of a picking stick. This picking mechanism is power controlled by cams.
- On existing rapier type weaving machines the weft is propelled by means of rapiers that pick up the filling yarn and carries it across the weaving machine.
- projectile weaving machines also referred to as gripper shuttle weaving machines, the weft is attached to a projectile/ gripper shuttle, which is propelled across the weaving width.
- compressed air is used to insert the pick.
- water under pressure is used to insert the weft across the weaving width.
- the weaving machine is warped by passing the warp yarns through heddles on two or more harnesses.
- the harness can be controlled by mechanical or electronic cams.
- the raising and lowering sequence of warp yarns in various sequence gives rise to weave structures like twill, satin, sateen, plain weave, pile fabrics etc.
- the first warp yarn remains one at the upper shed and the next 4 warp yarns remain at the lower shed, at the time of pick insertion.
- the second warp yarn from below moves up and the first warp yarn above moves down and the other three warp yarn remains below during the next pick insertion,.
- the third warp yarn moves up, the second warp yarn moves down and other three warp yarn remains below.
- the fourth warp yarn moves up and the third warp yarn moves down.
- the fifth warp yarn moves up and the fourth warp yarn moves down. This process is repeated for every five picks.
- the opposite process happens in four up and one down weaves. The same holds good for all weaves with more than 1x1 repeat.
- Beating up takes place after the shedding.
- beating up the yarn that is in the lower shed and the yarn that is in the upper shed are fully stretched while the yarn that is moving from bottom to top and top to bottom will be only partially stretched.
- This causes a higher force on the fully stretched yarns and a moderate stress on the less stretched yarns.
- the oscillating backrest cannot be used to compensate for the extra length of the open shed yarns for weaves other than plain weave, as the length of the yarns moving will be different except at the fully opened stage. Hence, during beat up different yarns will have different length and tension.
- US6135163 provides a warp thread tension compensation for the different thread groups during shedding with the help of a various tensioning module is attached at the circumference of the back rest.
- GB290382 discloses a method of manufacturing of leno cloth by sufficient lifting of heald frames with the help of cam modification.
- GB1063688 relates to a shuttle looms which permits an increase in the height of the shuttle to the same height as that of the reed with the help of cam modification.
- GB1077296 relates to a selective raising, lowering and keeping in pause or dwell condition of the heald shedding bars, according to the weaving and pattern requirement.
- Indian patent application no. 14/KOL/2008 discloses a cam mechanism for the shed formation and decoupling the cams from the rollers.
- the modified cam mechanism having at least two protrusions for lifting the heald frames such that shed formed between plurality of warp yarns for passage of the weft carrier on a weaving loom remains in lower to middle region of the shed during beating up operation.
- protrusions are at 270 degree and 0 or 360 degree, for the production of 1 up x 3 down weave.
- modified cam mechanism can be used in negative and positive driven cams.
- modified cam mechanism can be used as a modification in electronic tappets.
- a weaving machine having plurality of heald frames, cam mechanism, an oscillating backrest, and weft carrier, wherein the improvement comprises of:
- the modified cam mechanism with the protrusions lifts the heald frames such that shed formed between plurality of warp yarns for passage of the weft carrier on a weaving loom remains in lower to middle region of the shed during beating up operation.
- protrusions are at 270 degree and 0 or 360 degree, for the production of 1 up x 3 down weave.
- Another aspect of the present invention is directed to provide heald frames movement using modified cam mechanism in the weaving machine comprising:
- warp yarns will be at equal or near equal length between dropper and fell of cloth in the heald frames irrespective of the modified cam angles.
- the heald frames movement provides weave ability of warp yarns with near zero elasticity at high speeds without creating high peak tensions.
- modified cam mechanism is used as a modification in electronic tappets.
- the present invention is directed towards an improvement in heald frame movement in weaving machines to improve the weave ability.
- This is achieved with the help of a modified cam mechanism.
- the modification of the cam mechanism helps to achieve the improvement in weave ability and correlates with the working of electronic tappet and dobby in weaving machines.
- the same principle is used in negative cams, positive driven cams and is used as a modification in electronic tappets.
- the improvement in heald frame movement helps to provide improvement in the weave ability of yarns with near zero elasticity at very high speeds without creating high peak tensions.
- the present invention also helps to provide an improvement in the weave ability of twill, drill, sateen and other such weaves with either normal or stripe or reverse or broken in any type of weaving machine and facilitates weaving with more than 1x1 repeat.
- FIG. 1 a conventional design of 1 up x 3 down cam arrangement is shown.
- FIG 2 illustrates 1 up x 3 down modified cam arrangement according to the present invention.
- the figure illustrates modifications to the cam mechanism at change points between picks.
- the modified cam mechanism has at least two protrusions for lifting plurality of heald frames such that shed remains in the lower to middle region during beating up operation.
- FIG. 3 is a graphical representation of the movement of the heald frame using existing and modified cam mechanism of the present invention.
- the improved heald frame movement is achieved by the shuttle less cam looms or weaving machine comprising the modified cam mechanism, and the heald frame for movement of plurality of warp yarns.
- This forms the shed for the passage of shuttle or weft carrier between plurality of warp yarn on a weaving loom.
- plurality of warp yarns are brought with or without delay substantially to the shed crossing level, and then brought back to the starting position.
- the warp yarn In weaves where the warp yarn is split into five, the warp yarn remains 1 up, 4 down at the time of pick insertion as in the case of 1 up, 4 down Sateen weave, the first warp is brought up while warps 2, 3, 4 and 5 remains below during pick insertion. After shedding, in the next pick insertion, first warp is brought down and the second warp brought up.
- the protrusions in the modified cam lift the plurality of heald frames carrying plurality of warp yarns such that the shed remain in the lower to the middle region during beat up and after the beat up, the lifted heald frames are lowered down to the bottom position of the shed for the insertion of next pick.
- Warp 3, 4 and 5 is brought up with or without a delay up to the shed crossing level (just below) and then brought back to the starting position (below) position. During this process, the warp yarns will be at equal or near equal length between dropper and fell of cloth in the heald frames irrespective of the modified cam angles.
- the warp yarns are loaded equally and the oscillating backrest is synchronized to take up the extra length of the warp yarns. Having identical tension in all the warp yarns or near identical tension on all warp yarns during beat up helps oscillating backrest to take up the difference in length of yarn as the heald frame moves irrespective of the weave.
- the modified cam mechanism aids in the movement of heald frame irrespective of the weave. The movement can be modified to suit the speed of weaving thus reducing the acceleration, deceleration that happens during very high speed weaving as the heald frame can move up to 75 % and return back without moving to the neutral position.
- the modified cam mechanism improves the weave ability and allows weaving near zero elasticity yarns at very high speeds without creating high peak tensions. The reduction in tension on the warp yarn is lower if the heald frames remains at the bottom during the beat up. The same holds good for all weaves with more than 1x1 repeat.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN1618CH2012 | 2012-04-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2664700A1 true EP2664700A1 (fr) | 2013-11-20 |
Family
ID=48182754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13164842.0A Withdrawn EP2664700A1 (fr) | 2012-04-24 | 2013-04-23 | Métiers à tisser avec came pour égaliser la tension des fils de chaîne |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2664700A1 (fr) |
| JP (1) | JP2013227715A (fr) |
| CN (1) | CN103556347A (fr) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB290382A (en) | 1927-02-24 | 1928-05-17 | Renny Frankland | Improvements relating to shedding mechanism of looms for weaving |
| US2727538A (en) * | 1950-10-12 | 1955-12-20 | Staubli Geb & Co | Dobby loom and method of weaving |
| GB1063688A (en) | 1964-10-16 | 1967-03-30 | Tripette & Renaud | Improvements in or relating to looms |
| GB1077296A (en) | 1964-10-28 | 1967-07-26 | Clutsom And Kemp Ltd | Loom dobbies |
| US3567354A (en) * | 1967-09-20 | 1971-03-02 | Strake Maschf Nv | Apparatus for controlling the warp tension in a weaving machine |
| US6135163A (en) | 1998-12-07 | 2000-10-24 | Lindauer Dornier Gesellschaft Mbh | Method and apparatus for compensating warp thread tension or elongation variations during loom shedding |
| DE102007015411A1 (de) * | 2007-03-28 | 2008-10-02 | Groz-Beckert Kg | Kurvenscheibe für Exzentermaschine einer Webmaschine |
-
2013
- 2013-04-22 JP JP2013088965A patent/JP2013227715A/ja active Pending
- 2013-04-23 EP EP13164842.0A patent/EP2664700A1/fr not_active Withdrawn
- 2013-04-23 CN CN201310143191.2A patent/CN103556347A/zh active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB290382A (en) | 1927-02-24 | 1928-05-17 | Renny Frankland | Improvements relating to shedding mechanism of looms for weaving |
| US2727538A (en) * | 1950-10-12 | 1955-12-20 | Staubli Geb & Co | Dobby loom and method of weaving |
| GB1063688A (en) | 1964-10-16 | 1967-03-30 | Tripette & Renaud | Improvements in or relating to looms |
| GB1077296A (en) | 1964-10-28 | 1967-07-26 | Clutsom And Kemp Ltd | Loom dobbies |
| US3567354A (en) * | 1967-09-20 | 1971-03-02 | Strake Maschf Nv | Apparatus for controlling the warp tension in a weaving machine |
| US6135163A (en) | 1998-12-07 | 2000-10-24 | Lindauer Dornier Gesellschaft Mbh | Method and apparatus for compensating warp thread tension or elongation variations during loom shedding |
| DE102007015411A1 (de) * | 2007-03-28 | 2008-10-02 | Groz-Beckert Kg | Kurvenscheibe für Exzentermaschine einer Webmaschine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103556347A (zh) | 2014-02-05 |
| JP2013227715A (ja) | 2013-11-07 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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| 18D | Application deemed to be withdrawn |
Effective date: 20140521 |