EP0458754A1 - Device for tensioning warp yarns in a weaving loom - Google Patents
Device for tensioning warp yarns in a weaving loom Download PDFInfo
- Publication number
- EP0458754A1 EP0458754A1 EP91810396A EP91810396A EP0458754A1 EP 0458754 A1 EP0458754 A1 EP 0458754A1 EP 91810396 A EP91810396 A EP 91810396A EP 91810396 A EP91810396 A EP 91810396A EP 0458754 A1 EP0458754 A1 EP 0458754A1
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- EP
- European Patent Office
- Prior art keywords
- tensioning
- warp
- warp yarns
- tension
- time
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- 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.)
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- 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
Definitions
- the present invention relates to a device for applying tension to opposite lateral ends of a sheet of warp yarns in a weaving loom.
- the tension of warp yarns arranged in a array or a sheet in a weaving loom differs between the center and the opposite lateral ends of the sheet as determined along the sheet width, i.e. the warp yarn tension is lower toward the lateral ends of the sheet.
- Such loser tension causes poor separation of warp yarns in forming a shed opening by separated upper and lower arrays of warp yarns.
- a device which is designed to increase the tension of warp yarns at the lateral ends of warp yarn sheet is disclosed e.g. in JP 52-110967, JP 58-169545 and JP 59-43150.
- the device according JP 58-169545 uses a pair of tensioning members which are positioned in parallel to each other at the lateral ends of warp yarn sheet so as to hold the warp yarns therebetween and which are disposed extending at such an angle with respect to a line along the widthwise direction of the warp yarn sheet that the outer end of each of the tensioning members is positioned closer to cloth fell than the inner end thereof.
- substantially constant tension can be applied to the lateral ends of warp yarn sheet. If the tension is increased for improvement in separation of warp yarn into upper and lower sheets, however, the warp yarns at the lateral ends will be constantly subjected to a high tension, which may cause the warp yarns to break.
- the time at which tension is applied depends solely on a predetermined shedding curve, with the result that there is no freedom of adjusting the time of tension application.
- the warp yarn tension differs between the time of shed opening and shed closing of the warp yarn sheet because each shed opens and closes at a different time, compared to the other.
- the rate of difference is higher at the lateral ends of the sheet, where the basic tension is lower.
- the droppers at the lateral ends of the warp yarn sheet will vibrate and possibly even jump more, compared to droppers in the more central parts of the warp yarn sheet.
- Such increased vibration may cause the warp yarns at the lateral part to be fluffered and even to break and/or the selvage to become irregular.
- the tensioning member of the device is operated to press on the opposite lateral ends of warp yarn sheet for each weft picking at a time which is selectably adjusted by the tension application time adjusting means according to the invention.
- the warp yarns at the lateral ends can be tensioned at the right time for weft picking.
- timed application of tension to warp yarns in accordance with lateral end of warp yarns the time of weft picking provides for smooth separation of warp yarns at the lateral ends, thereby to forming a shed opening without a delay. As a result, failure in weft picking due to inadequate shed opening is prevented successfully.
- reducing the difference in tention in the warp thread in the open and the closed shed position is achieved by adjusting the time of pressing on the lateral ends of the warp yarn sheet according to the time of the shed is cosing of the warp yarn sheet. This measure reduces vibration of droppers and fluffering and consequently warp yarn breaks considerably.
- the shed is closing provides for increasing the tension of the lateral part of the warp yarn sheet.
- the difference in tension of the lateral part of the warp yarn sheet is limited between the open shed and the closed shed position of the warp sheet in the weaving cylcle.
- the time at which the tensioning member is operated to apply tension to opposite lateral ends of warp yarn sheet can be adjusted as desired in accordance with the time of weft picking or the time of closing and opening the warp yarn shed.
- timed application of tension to warp yarns in accordance with the time of picking can make possible smooth separation of warp yarns at the lateral ends thereby to form a shed opening without a delay.
- failure in weft picking due to inadequate shed opening can be prevented successfully.
- Timed application of tension to warp yarns in accordance with the closing the shed basically reduces the differences of yarn tention in the weaving cycle. difference make possible smooth separation of warp yarns at the lateral ends thereby to form a shed opening without a delay. As a result, failure in weft picking due to inadequate shed opening can be prevented successfully.
- the device for tensioning the warp yarns allows for tension by operation of the tensioning member to apply tension to opposite lateral ends of warp yarn sheet and can be adjusted as necessary and required in accordance with the time of weft picking.
- timed application of tension to warp yarns provide for smooth separation of warp yarns at the lateral ends, thereby forming a shed opening without a delay.
- failure in weft picking due to inadequate shed opening can be prevented successfully.
- Fig. 1 to 9 show a first embodiment and Fig. 1A to 4A show another embodiment of the invention and details thereof;
- Fig. 1 is a schematic side view showing an embodiment of the device according to the present invention as applied to a jet loom
- warp yarns T unwound from a warp beam 19 are moved over a back roller 1 and a easing roller 2 and further through respective warp break detectors 3 and healds 4, and then woven by a reed 5 into a fabric W which is wound b ⁇ a take-up roll 6.
- References W1 designates a cloth fell and N depicts a main picking nozzle which is swingable together with the reed 5.
- the easing roller 2 is supported by and between a pair of easing levers 7A und 7B which are swingable about pivot shafts 8a and 8b, respectively.
- the easing levers 7A, 7B have connected thereto at the distal ends thereof a pair of rods 9A, 9B, which are in turn connected to crank mechanism (not shown).
- the crank mechanism operates in synchronism with the rotation of the loom so that the rods 9A, 9B make one stroke of reciprocating motion for one complete rotation of the loom.
- Support brackets 10A, 10B are fixed to the proximal ends of the respective easing levers 7A, 7B, and tensioning rollers 11A, 11B are cantilevered at one ends thereof to the support brackets 10A, 10B via connectors 12A, 12B.
- the tensioning rollers 11A, 11B extend inward of the warp yarn sheet T and positioned at an angle with respect to a plane formed by warp yarn sheet T1 between the back roller 1 and easing roller 2.
- the support brackets 10A, 10B have formed therein elongated holes 10a through which bolts 13A, 13B extend to be screwed into the connectors 12A, 12B.
- the connectors 12A, 12B are detachably fixed to the support brackets 10A, 10B by means of the bolts 13A, 13B.
- the elongated hole 10a extends in a direction across the warp yarn sheet T1 between the back roller 1 and easing roller 2, thus permitting the tensioning rollers 11A, 11B to be positioned adjustably along the hole 10a, hence in a direction across the warp yarn sheet T1.
- the sketches (a, (b) and (c) of Fig. 4 show the tensioning roller 11A which is positioned on the side adjacent to the main weft picking nozzle N.
- the tensioning roller 11A is swingable integrally together with the easing roller 2 about the pivotal shaft 8A.
- the same is true of the other tensioning roller 11B provided on the opposite side of the loom.
- the curved lines C1, C2 show shedding curves of two alternating upper and lower arrays of warp yarns.
- the curved line C3 shows a swing curve of the easing roller 2, and the curved line D4 a swing curve of the tensioning roller 11A, respectively.
- Abscissa X for the swing curve C4 represents the position where the tensioning roller 11A is placed just in contact with the warp yarn sheet T1, and the swing curve C4 represents the angle to which the tensioning roller 11A has swung from the above position X.
- Abscissa X for the swing curve C4 represents the position where the tensioning roller 11A is placed just in contact with the warp yarn sheet T1
- the swing curve C4 represents the angle to which the tensioning roller 11A has swung from the above position X.
- the area which is above the abscissa X shows the area in which the tensioning roller 11A is kept in contact with the warp yarn sheet T1
- the area below the abscissa X shows the area in which the roller is clear of the warp yarn sheet.
- the sketch (a) of Fig. 4 shows the position of the easing roller 2 and the tensioning roller 11A, where the warp yarn shed is closed, and the sketsch (c) of the same figure shows the position of the easing roller 2 and the tensioning roller 11A, where the warp yarn shed is wide open.
- the sketch (b) of Fig. 4 shows the position where the tensioning roller 11A has been just moved into, or it is just about to move away from, contact engagement with the warp yarn sheet T1.
- position of the tensioning roller 11A between the condition (a) and (b) of Fig. 4 correspond to the curved line C4 in the area below the abscissa X in Fig.
- a basic difference of the embodiments of the invention displayed in Fig. 1A, 2A, 3A and 4A (a), (b) and (c) is that the tensioning rollers 11A is moving the warp yarn sheet T away from the back roller 1 and the easing roller 2 and not against back roller 1 and easing roller 2 when the warp yarn sheet must be tensioned
- the curved line C5 indicates the distrubution of warp yarn tension without use of the tensioning rollers 11A, 11B, as measured in the widthwise direction of the warp yarn sheet when the shed is open.
- the curved line C6 shows the distribution of warp yarn tension when tension is applied by the tensioning rollers 11A, 11B. It is apparent from the diagram that smoothness in separation of warp yarns into upper and lower sheets at the lateral ends T L and T R can be improved by increasing the tension at such ends of the warp yarn sheet.
- the time at which the tension is applied to the ends T L and T R by the tensioning rollers 11A, 11B can be adjusted so as to form the shed opening at the right time for weft picking. This is accomplished by adjusting the mounting position of the tensioning rollers 11A, 11B along the elongated holes 10a in the support brackets 10A, 10B with respect to the easing levers 7A, 7B in accordance with the weft picking time.
- the warp yarn sheet at its lateral ends T L and T R will not be subjected constantly to high tension, there is no fear of warp yarn break due to constant application of high tension, as was ovserved in pior art device.
- the adjustment of the mounting position of the tensioning rollers 11A, 11B can be performed easily merely by moving the connectors 12A, 12B along the holes 10a in the support brackets 10A, 10B with the bolts 13A, 13B loosened. This adjustment will displace the curved line C4 in Fig. 5 in upward or downward direction with reference to the abscissa X.
- an air cylinder 14 having a movable rod at the distal end of which is mounted a tensioning member 14a.
- the tensioning member 14a is moved by the air cylinder 14 to press on a lateral end of warp yarn sheet T1 between the back roller 1 and easing roller 2.
- Operation of the air cylinder 14 is controlled by an electromagnetically operated valve (not shown) which is operable to be energized or deenergized at controlled times in response to the time of each weft picking.
- an electromagnetically operated valve (not shown) which is operable to be energized or deenergized at controlled times in response to the time of each weft picking.
- FIG. 8 which is applied to a weaving loom having no back roller, there is porvided an air cylinder 14 carrying a tensioning menber 14a which is movable to press on a lateral end of warp yarn sheet T between the easing roller 2 and warp stop bar 15.
- the air cylinder 14 may be substituted with any suitable means such as electromagnetic solenoid.
- a lever 16 swingably supported by a pivotal shaft 20 and having at one end thereof a tensioning member 16a which is engageable with a lateral end of warp yarn sheet.
- the lever 16 is connected at the other end thereof via a rod 18 to a crank disk 17 which is in turn coupled to a drive of the loom.
- the end of the rod 18 remote from its connection with the lever 16 is adjustably connected to the crank disk 17 through an elongated hole 17 formed in the disk. Adjustment of the connecting position of the rod 18 to the crank disk 17 can permit timed application of tension by the tensioning member 16a to the lateral end of warp yarn sheet T.
- the time at which the tensioning member is operated to apply tension to opposite lateral ends of warp yarn sheet can be adjusted as desired in accordance with the time of weft picking.
- timed application of tension to warp yarns can make possible smooth separation of warp yarns at the lateral ends thereby to form a shed opening without a delay.
- failure in weft picking due to inadequate shed opening can be prevented successfully.
- Tensioning rollers 11A, 11B Tensioning time adjusting means including elongated holes 10a, connectors 12A, 12B and bolts 13A, 13B; warp yarn sheet T; Lateral ends of warp yarn sheet T L , T R .
- the device (9A,7A,10a,10b,11A) for tensioning the warp yarns (T) allows for tension by operation of the tensioning members (11A,11B) to apply tension to opposite lateral ends of warp yarn sheet and can be adjusted as necessary and required in accordance with the time of weft picking and/or the time of shed closing.
- timed application of tension to warp yarns at the time of picking provides for smooth separation of warp yarns at the lateral ends, thereby forming a shed opening without a delay.
- failure in weft picking due to inadequate and improper shed opening can be prevented successfully.
- the decrease of difference of tension in the open shed and the closed shed points in the weaving cycle reduces vibration of droppers and as a consequence also fluffering and even the number of breaks of warp threads (T).
Abstract
Description
- The present invention relates to a device for applying tension to opposite lateral ends of a sheet of warp yarns in a weaving loom.
- It is generally known in the art that the tension of warp yarns arranged in a array or a sheet in a weaving loom differs between the center and the opposite lateral ends of the sheet as determined along the sheet width, i.e. the warp yarn tension is lower toward the lateral ends of the sheet. Such loser tension causes poor separation of warp yarns in forming a shed opening by separated upper and lower arrays of warp yarns.
- If the warp yarn separation is inadequate, particularly, on the side from which the weft yarn is inserted, it may result in failure in weft insertion. A device which is designed to increase the tension of warp yarns at the lateral ends of warp yarn sheet is disclosed e.g. in JP 52-110967, JP 58-169545 and JP 59-43150.
- In the devices according to JP 52-110967 and JP 59-43150, spring force is utilized to apply tension to the lateral ends of warp yarn sheet. The device according JP 58-169545 uses a pair of tensioning members which are positioned in parallel to each other at the lateral ends of warp yarn sheet so as to hold the warp yarns therebetween and which are disposed extending at such an angle with respect to a line along the widthwise direction of the warp yarn sheet that the outer end of each of the tensioning members is positioned closer to cloth fell than the inner end thereof.
- In either of the devices according to JP 52-110967 and JP 59-43150, substantially constant tension can be applied to the lateral ends of warp yarn sheet. If the tension is increased for improvement in separation of warp yarn into upper and lower sheets, however, the warp yarns at the lateral ends will be constantly subjected to a high tension, which may cause the warp yarns to break.
- In the device according to JP 58-169545, in which the warp yarn tension is increased by an increase in the shed opening, the time at which tension is applied depends solely on a predetermined shedding curve, with the result that there is no freedom of adjusting the time of tension application.
- Even by easing motion, the warp yarn tension differs between the time of shed opening and shed closing of the warp yarn sheet because each shed opens and closes at a different time, compared to the other. The rate of difference is higher at the lateral ends of the sheet, where the basic tension is lower.
- As a result of said difference in yarn tension, the droppers at the lateral ends of the warp yarn sheet will vibrate and possibly even jump more, compared to droppers in the more central parts of the warp yarn sheet. Such increased vibration may cause the warp yarns at the lateral part to be fluffered and even to break and/or the selvage to become irregular.
- Therefore, it is an object of the present invention to provide a device which permits adjustment of tension application time so that the warp yarns are tensioned at the right time for weft picking.
- According to the present invention this problem is solved by the teaching contained in
claim 1. The depending claims are related to particular embodiments of the invention. - The tensioning member of the device is operated to press on the opposite lateral ends of warp yarn sheet for each weft picking at a time which is selectably adjusted by the tension application time adjusting means according to the invention. The warp yarns at the lateral ends can be tensioned at the right time for weft picking. Thus, timed application of tension to warp yarns in accordance with lateral end of warp yarns the time of weft picking provides for smooth separation of warp yarns at the lateral ends, thereby to forming a shed opening without a delay. As a result, failure in weft picking due to inadequate shed opening is prevented successfully.
- It is another object of invention to decrease fluffering by vibrating in the lateral ends of the warp yarn sheet. According to the invention reducing the difference in tention in the warp thread in the open and the closed shed position is achieved by adjusting the time of pressing on the lateral ends of the warp yarn sheet according to the time of the shed is cosing of the warp yarn sheet. This measure reduces vibration of droppers and fluffering and consequently warp yarn breaks considerably.
- Tensioning the warp yarn sheet according to the time, the shed is closing provides for increasing the tension of the lateral part of the warp yarn sheet. At the same time the difference in tension of the lateral part of the warp yarn sheet is limited between the open shed and the closed shed position of the warp sheet in the weaving cylcle.
- It is apparent from the foregoing, that according to the invention, the time at which the tensioning member is operated to apply tension to opposite lateral ends of warp yarn sheet can be adjusted as desired in accordance with the time of weft picking or the time of closing and opening the warp yarn shed.
- Thus, timed application of tension to warp yarns in accordance with the time of picking can make possible smooth separation of warp yarns at the lateral ends thereby to form a shed opening without a delay. As a result, failure in weft picking due to inadequate shed opening can be prevented successfully.
- Timed application of tension to warp yarns in accordance with the closing the shed basically reduces the differences of yarn tention in the weaving cycle. difference make possible smooth separation of warp yarns at the lateral ends thereby to form a shed opening without a delay. As a result, failure in weft picking due to inadequate shed opening can be prevented successfully.
- The device for tensioning the warp yarns allows for tension by operation of the tensioning member to apply tension to opposite lateral ends of warp yarn sheet and can be adjusted as necessary and required in accordance with the time of weft picking. Thus, timed application of tension to warp yarns provide for smooth separation of warp yarns at the lateral ends, thereby forming a shed opening without a delay. As a result, failure in weft picking due to inadequate shed opening can be prevented successfully.
- Examples of the invention are described with reference to the schematic drawings. Fig. 1 to 9 show a first embodiment and Fig. 1A to 4A show another embodiment of the invention and details thereof;
- Fig. 1 and 1A is a schematic side view showing the warp yarn tensioning device in a weaving loom;
- Fig. 2 and 2A is perspective view showing the tensioning device of Fig. 1;
- Fig. 3 and 3A is a back view showing the tensioning device;
- Fig. 4 (a),(b) and (c) provide for sectional side views, showing the tensioning device in different operating positions;
- Fig. 4A (a),(b) and (c) provide for sectional side views, showing the tensioning device in different operating positions;
- Fig. 5 provides for diagrams showing shedding curves and a swing curve of the tensioning roller;
- Fig. 6 provides for a diagram, showing curves representing distributions of warp yarn tension; and
- Fig. 7 to 9 are sectional side views showing other embodiments of the present invention, respectively.
- Referring to Fig. 1 which is a schematic side view showing an embodiment of the device according to the present invention as applied to a jet loom, warp yarns T unwound from a
warp beam 19 are moved over aback roller 1 and aeasing roller 2 and further through respectivewarp break detectors 3 andhealds 4, and then woven by areed 5 into a fabric W which is wound b· a take-up roll 6. References W₁ designates a cloth fell and N depicts a main picking nozzle which is swingable together with thereed 5. - Referring to Fig. 2, the
easing roller 2 is supported by and between a pair ofeasing levers 7A und 7B which are swingable about pivot shafts 8a and 8b, respectively. The easing levers 7A, 7B have connected thereto at the distal ends thereof a pair ofrods 9A, 9B, which are in turn connected to crank mechanism (not shown). The crank mechanism operates in synchronism with the rotation of the loom so that therods 9A, 9B make one stroke of reciprocating motion for one complete rotation of the loom. -
Support brackets respective easing levers tensioning rollers support brackets connectors tensioning rollers back roller 1 and easingroller 2. Thesupport brackets elongated holes 10a through whichbolts 13A, 13B extend to be screwed into theconnectors connectors support brackets bolts 13A, 13B. - As shown in the sketches (a), (b) and (c) of Fig. 4, the
elongated hole 10a extends in a direction across the warp yarn sheet T₁ between theback roller 1 and easingroller 2, thus permitting thetensioning rollers hole 10a, hence in a direction across the warp yarn sheet T₁. - The sketches (a, (b) and (c) of Fig. 4 show the
tensioning roller 11A which is positioned on the side adjacent to the main weft picking nozzle N. The tensioningroller 11A is swingable integrally together with theeasing roller 2 about thepivotal shaft 8A. The same is true of theother tensioning roller 11B provided on the opposite side of the loom. - Referring to Fig. 5, the curved lines C₁, C₂ show shedding curves of two alternating upper and lower arrays of warp yarns. The curved line C₃ shows a swing curve of the
easing roller 2, and the curved line D₄ a swing curve of thetensioning roller 11A, respectively. Abscissa X for the swing curve C₄ represents the position where thetensioning roller 11A is placed just in contact with the warp yarn sheet T₁, and the swing curve C₄ represents the angle to which thetensioning roller 11A has swung from the above position X. In the lower diagram of Fig. 5, the area which is above the abscissa X shows the area in which thetensioning roller 11A is kept in contact with the warp yarn sheet T₁, while the area below the abscissa X shows the area in which the roller is clear of the warp yarn sheet. - The sketch (a) of Fig. 4 shows the position of the
easing roller 2 and thetensioning roller 11A, where the warp yarn shed is closed, and the sketsch (c) of the same figure shows the position of theeasing roller 2 and thetensioning roller 11A, where the warp yarn shed is wide open. The sketch (b) of Fig. 4 shows the position where thetensioning roller 11A has been just moved into, or it is just about to move away from, contact engagement with the warp yarn sheet T₁. Thus, position of thetensioning roller 11A between the condition (a) and (b) of Fig. 4 correspond to the curved line C₄ in the area below the abscissa X in Fig. 5, and position of thetensioning roller 11A between the conditions (b) and (c) correspond to the curved line C₄ in the area above the abscissa X. As the warp yarn sheet T commences to form a shed opening by warp yarns, thetensioning rollers 11A commence to contact with the warp yarn sheet at the lateral end TL of the warp yarn sheet T which is adjacent to the weft picking main nozzle N and at the opposite lateral end TR thereof, respectively. - A basic difference of the embodiments of the invention displayed in Fig. 1A, 2A, 3A and 4A (a), (b) and (c) is that the
tensioning rollers 11A is moving the warp yarn sheet T away from theback roller 1 and the easingroller 2 and not againstback roller 1 and easingroller 2 when the warp yarn sheet must be tensioned - Referring to the diagram of Fig. 6, the curved line C₅ indicates the distrubution of warp yarn tension without use of the
tensioning rollers tensioning rollers tensioning rollers tensioning rollers elongated holes 10a in thesupport brackets - The adjustment of the mounting position of the
tensioning rollers connectors holes 10a in thesupport brackets bolts 13A, 13B loosened. This adjustment will displace the curved line C₄ in Fig. 5 in upward or downward direction with reference to the abscissa X. - According to this embodiment wherein the
tensioning rollers - It is to be noted that the present invention is not limited to the above-described embodiment, but it may be practiced in other various ways, as exemplified by embodiments which are illustrated in Figs. 7 - 9.
- Referring to Fig. 7, there is provided an
air cylinder 14 having a movable rod at the distal end of which is mounted atensioning member 14a. The tensioningmember 14a is moved by theair cylinder 14 to press on a lateral end of warp yarn sheet T₁ between theback roller 1 and easingroller 2. Operation of theair cylinder 14 is controlled by an electromagnetically operated valve (not shown) which is operable to be energized or deenergized at controlled times in response to the time of each weft picking. Thus, the time at which the tension is applied to the lateral ends of warp yarn sheet T₁ can be adusted as required, thereby permitting tension application at the right time for weft picking. - In the embodiment shown in Fig. 8 which is applied to a weaving loom having no back roller, there is porvided an
air cylinder 14 carrying atensioning menber 14a which is movable to press on a lateral end of warp yarn sheet T between the easingroller 2 andwarp stop bar 15. - In the above embodiments shown in Figs. 7 and 8, the
air cylinder 14 may be substituted with any suitable means such as electromagnetic solenoid. - Referring then to Fig. 9 showing further embodiment of the invention, there is provided a
lever 16 swingably supported by apivotal shaft 20 and having at one end thereof atensioning member 16a which is engageable with a lateral end of warp yarn sheet. Thelever 16 is connected at the other end thereof via arod 18 to a crankdisk 17 which is in turn coupled to a drive of the loom. The end of therod 18 remote from its connection with thelever 16 is adjustably connected to thecrank disk 17 through anelongated hole 17 formed in the disk. Adjustment of the connecting position of therod 18 to thecrank disk 17 can permit timed application of tension by the tensioningmember 16a to the lateral end of warp yarn sheet T. - As it is apparent from the foregoing, that according to the invention, the time at which the tensioning member is operated to apply tension to opposite lateral ends of warp yarn sheet, can be adjusted as desired in accordance with the time of weft picking. Thus, timed application of tension to warp yarns can make possible smooth separation of warp yarns at the lateral ends thereby to form a shed opening without a delay. As a result, failure in weft picking due to inadequate shed opening can be prevented successfully.
-
Tensioning rollers elongated holes 10a,connectors bolts 13A, 13B; warp yarn sheet T; Lateral ends of warp yarn sheet TL, TR. - The device (9A,7A,10a,10b,11A) for tensioning the warp yarns (T) allows for tension by operation of the tensioning members (11A,11B) to apply tension to opposite lateral ends of warp yarn sheet and can be adjusted as necessary and required in accordance with the time of weft picking and/or the time of shed closing. Thus, timed application of tension to warp yarns at the time of picking provides for smooth separation of warp yarns at the lateral ends, thereby forming a shed opening without a delay. As a result, failure in weft picking due to inadequate and improper shed opening can be prevented successfully. The decrease of difference of tension in the open shed and the closed shed points in the weaving cycle reduces vibration of droppers and as a consequence also fluffering and even the number of breaks of warp threads (T).
Claims (7)
- Device for tensioning warp yarns in a weaving loom, comprising:
a warp yarn tensioning mechanism (9A,7A,8A) including a tensioning member (11A) for applying tension to opposite lateral ends of a sheet of warp yarns (T) by pressing on said lateral end portions, and
tension application time adjusting means for adjusting the time of pressing by said tensioning member (11A) on said lateral ends (TL, TR) of the warp yarn sheet (T) according to a desired period of time of the weaving cycle. - Device for tensioning warp yarns according to claim 1, wherein the desired time of tensioning in the weaving cycle is correlated with and falls within the weft picking time.
- Device for tensioning warp yarns according to claim 1, wherein the desired time of tensioning in the weaving cycle is correlated with and falls within the time of shed closing of the warp yarn sheet (T).
- Device for tensioning warp yarns according to any of the claims 1 to 3 including a tensioning member (11A 11B) extending inward the warp and positioned at an angle with respect to the plane definded by the warp yarn sheet (T₁) in a way, that the increase of tension is highest at the most lateral part of the lateral end portion of the warp yarn sheet (T₁).
- Device for tensioning warp yarns according to any of claims 1 to 4, including actuating means driven with reference to the angle of rotation of the main shaft of the weaving loom.
- Device for tensioning warp yarns according to any of claims 1 to 5, including a pneumatic or hydraulic drive (14) for actuating the tensioning member (14a).
- Device for tensioning warp yarns according to any of claims 1 to 5, including a lever (16) swingably supported by a pivotal shaft (20) with the tensioning member (16a) fixed on one side of said lever (16).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2134520A JP2987881B2 (en) | 1990-05-24 | 1990-05-24 | Warp tension applying device in loom |
JP134520/90 | 1990-05-24 |
Publications (2)
Publication Number | Publication Date |
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EP0458754A1 true EP0458754A1 (en) | 1991-11-27 |
EP0458754B1 EP0458754B1 (en) | 1995-11-29 |
Family
ID=15130249
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19910810396 Expired - Lifetime EP0458754B1 (en) | 1990-05-24 | 1991-05-24 | Device for tensioning warp yarns in a weaving loom |
Country Status (3)
Country | Link |
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EP (1) | EP0458754B1 (en) |
JP (1) | JP2987881B2 (en) |
DE (1) | DE69114912T2 (en) |
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US20170247819A1 (en) * | 2016-02-25 | 2017-08-31 | Kabushiki Kaisha Toyota Jidoshokki | Warp shedding apparatus of loom |
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US5358351A (en) * | 1992-09-30 | 1994-10-25 | Casio Computer Co., Ltd. | Printing apparatus and printing tape cassette used therefor |
JP5464172B2 (en) * | 2011-05-27 | 2014-04-09 | 株式会社豊田自動織機 | Pile loom pile warp tension adjuster |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH250056A (en) * | 1944-12-29 | 1947-08-15 | Dewas Raymond | Device for tensioning the chain threads of selvedges unwinding from a beam. |
GB918817A (en) * | 1960-05-11 | 1963-02-20 | Sulzer Ag | Looms |
FR2339014A1 (en) * | 1976-01-20 | 1977-08-19 | Rueti Te Strake Bv | DEVELOPMENT IN THE WOMEN |
-
1990
- 1990-05-24 JP JP2134520A patent/JP2987881B2/en not_active Expired - Lifetime
-
1991
- 1991-05-24 DE DE1991614912 patent/DE69114912T2/en not_active Expired - Fee Related
- 1991-05-24 EP EP19910810396 patent/EP0458754B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH250056A (en) * | 1944-12-29 | 1947-08-15 | Dewas Raymond | Device for tensioning the chain threads of selvedges unwinding from a beam. |
GB918817A (en) * | 1960-05-11 | 1963-02-20 | Sulzer Ag | Looms |
FR2339014A1 (en) * | 1976-01-20 | 1977-08-19 | Rueti Te Strake Bv | DEVELOPMENT IN THE WOMEN |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102817164A (en) * | 2012-07-23 | 2012-12-12 | 苏州迪盛织造整理有限公司 | Selvedge tension controlling device of water jet loom |
US20170247819A1 (en) * | 2016-02-25 | 2017-08-31 | Kabushiki Kaisha Toyota Jidoshokki | Warp shedding apparatus of loom |
US10287713B2 (en) | 2016-02-25 | 2019-05-14 | Kabushiki Kaisha Toyota Jidoshokki | Warp shedding apparatus of loom |
Also Published As
Publication number | Publication date |
---|---|
JPH0434047A (en) | 1992-02-05 |
DE69114912D1 (en) | 1996-01-11 |
EP0458754B1 (en) | 1995-11-29 |
DE69114912T2 (en) | 1996-08-01 |
JP2987881B2 (en) | 1999-12-06 |
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