EP1805359A1 - Weaving device - Google Patents
Weaving deviceInfo
- Publication number
- EP1805359A1 EP1805359A1 EP05794265A EP05794265A EP1805359A1 EP 1805359 A1 EP1805359 A1 EP 1805359A1 EP 05794265 A EP05794265 A EP 05794265A EP 05794265 A EP05794265 A EP 05794265A EP 1805359 A1 EP1805359 A1 EP 1805359A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- yarn
- weaving device
- shed
- tube
- weft yarn
- 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- Withdrawn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
Classifications
-
- 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
- D03D49/24—Mechanisms for inserting shuttle in shed
- D03D49/42—Mechanisms for inserting shuttle in shed whereby the shuttle is propelled by liquid or gas pressure
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/12—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick
- D03D47/24—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein single picks of weft thread are inserted, i.e. with shedding between each pick by gripper or dummy shuttle
Definitions
- the present invention relates to a weaving device comprising means for forming a shed of warp yarns, with insertion means being disposed on one side or both sides of the shed for inserting a weft yarn formed into a closely packed ball of yarn, which packed ball of yarn unwinds into an elongated weft yarn upon insertion into the shed, said weft yarn having a front yarn end and a rear yarn end, seen in the direction of insertion.
- a weaving device is known, for example from unpublished
- the rear yarn end may be provided with a thickening that is to mate with the holding element, which thickening is in the form of a knot in the weft yam or a twisted-together yarn end, or which is made up of a material other than yarn, for example wax, a plastic, paint, (carbon dioxide) ice, the holding or clamping down of the rear end of the weft yarn can be effected in an efficient manner by driving the pawl, causing the thickening and thus the yam to be stopped or held.
- a thickening is in the form of a knot in the weft yam or a twisted-together yarn end, or which is made up of a material other than yarn, for example wax, a plastic, paint, (carbon dioxide) ice
- Figures 3-11 show other embodiments of a weaving device according to the invention.
- the orientation means 10 is disposed at the edge of the cloth or fabric 3 (side of the shed 2, 4).
- the orientation means 10 is embodied as a plate-shaped member provided with an opening 10a, through which the carrier 24 can be passed upon insertion into the shed 2, 4.
- a second holding element 31 Disposed near the rear tube end 30b is a second holding element 31 , which holds or clamps down the rear yarn end 21 with the thickening 22 so that the weft yam 20 will unwind into the shed 2, 4 upon insertion of the carrier 24 with the ball of yarn 20.
- the insertion of the carrier 24 takes place by means of a pulse of a medium under pressure P, which is introduced into the tube 30 via the rear tube end 30b.
- the orientation means 35 are moved through the insertion tube 30 in the direction of the front tube end 30a together with the carrier 24 (and the weft yarn 20).
- the carrier 24 exits the insertion tube 30 and is "shot” into the shed 2, 4, whilst the orientation means 35 are stopped in the insertion tube 30 near the front tube end 30a by stop means 34, for example projections formed on the inner side of the insertion tube 30. Since the weft yarn is held by the orientation means 35, the weft yarn 20 unwinds into the shed 2, 4. Then the orientation means 35 are deactivated and moved back to the rear of tube end 30b for the next "shot".
- Figure 11 shows a tenth embodiment of a weaving device according to the invention, which can function as an alternative to the embodiment that is shown in figure 10.
- the retrieving means are configured as a feed-through tube 60 provided with a longitudinal bore 61 and having a front tube end 61b and a rear tube end 60a (seen in the direction of insertion of the weft yarn 21 ). The moment a carrier 24 is inserted into the shed 2, 4 by means of the insertion tube 30, the rear yarn end 23 is cut through by the cutting element 5.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
The invention relates to a weaving device comprising means for forming a shed (3) of warp yarns (2, 4), with insertion means (30) being disposed on one side or both sides of the shed for inserting a weft yarn (20) formed into a closely packed ball of yarn, which packed ball of yarn unwinds into an elongated weft yarn upon insertion into the shed, said weft yarn having a front yarn end (23) and a rear yarn end (21), seen in the direction of insertion. According to the invention, the weaving device comprises means (10) that orient the rear yarn end (21) substantially in line with one side of the shed. In this way the length of the weft yarns to be inserted can be fully geared to the width of the shed, so that unnecessary yarn waste is prevented.
Description
Weaving device
DESCRIPTION
The present invention relates to a weaving device comprising means for forming a shed of warp yarns, with insertion means being disposed on one side or both sides of the shed for inserting a weft yarn formed into a closely packed ball of yarn, which packed ball of yarn unwinds into an elongated weft yarn upon insertion into the shed, said weft yarn having a front yarn end and a rear yarn end, seen in the direction of insertion. Such a weaving device is known, for example from unpublished
Dutch patent application No. 1023943 in the name of the present applicant. With the construction that is used therein, part of the weft yarn extends beyond the fabric to be formed, which means yarn waste.
The object of the present invention is to realise an improvement of the weaving device that is disclosed in Dutch patent application No. 1023943, and according to the invention the weaving device comprises means that orient the rear yarn end substantially in line with one side of the shed. As a result, the length of the weft yarns to be inserted can be fully geared to the width of the shed, so that unnecessary yarn waste is prevented. In a specific embodiment, the orientation means comprise at least one first holding element for holding the rear yarn end that is to be oriented substantially in line with one side of the shed. The orientation means may comprise a second holding element disposed before the first holding element, seen in the direction of movement of the weft yarn, for holding the rear yarn end for a predetermined period of time upon insertion of the weft yarn.
The first or second holding elements can be driven, if desired.
In a functional embodiment, the orientation means further comprise sensor means for detecting the position of the rear yarn end, which can move freely after said predetermined period of time, and driving the first holding element on the basis of the detected position.
These two specific embodiments are designed to hold the rear yarn end at the start of the insertion of the ball of weft yarn, which, on account of the spatial construction of the insertion means, takes place at a location some distance away from one side of the shed. By releasing the rear yarn end in time upon
insertion of the weft yarn, which unwinds into an elongated weft yam upon insertion into the shed, the rear yarn end will move in the direction of said side of the shed.
A precise positioning of the rear yarn end is achieved in that the rear yarn end is held by another holding element, as a result of which the amount of yarn waste is reduced, whilst it is also possible to position the weft yarn at the correct length and position with respect to the fabric to be formed.
In one embodiment the rear yarn end is caught by the first holding element solely on a time basis, based on the velocity of the ball of yarn that is "shot" into the shed, whilst in another embodiment said catching of the rear yarn end takes place by means of sensors, which drive the first holding element on the basis of the detection of the rear yarn end moving past.
As in a specific embodiment the rear yarn end may be provided with a thickening that is to mate with the holding element, which thickening is in the form of a knot in the weft yam or a twisted-together yarn end, or which is made up of a material other than yarn, for example wax, a plastic, paint, (carbon dioxide) ice, the holding or clamping down of the rear end of the weft yarn can be effected in an efficient manner by driving the pawl, causing the thickening and thus the yam to be stopped or held.
In a specific embodiment, the first holding element comprises a plate-shaped member disposed beside the side of the shed, which is provided with a slot having a width equal to or greater than the width of the weft yarn but smaller than that of the thickening.
More specifically, the plate-shaped member can be positioned in the direction of insertion of the weft yarn upon insertion thereof. More specifically, by mounting the plate-shaped member on the shed-moving mechanism, an optimum synchronisation as regards the insertion of the weft yarn and the timely "catching" or holding of the rear yarn end is obtained.
More in particular, the first holding element furthermore comprises a drivable pawl, which is disposed directly beside the plate-shaped member and which extends perpendicularly to the direction of insertion and to the slot, which pawl can be moved from a first position on the side opposite the slot to a second position on the side of the slot.
More specifically, the pawl can be moved from said first position to said second position after the packed ball of yarn has passed the plate-shaped
member during the insertion process.
In another functional embodiment, the orientation means can be moved towards and away from the side of the shed. In said embodiment, the orientation means are placed on a supporting element that can be moved towards and away from the side of the shed, which supporting element in particular forms part of the insertion means. This functional embodiment makes it possible to "launch" the ball of yarn into the shed, as it were, thus positioning the orientation means directly beside the shed.
In another functional embodiment, the insertion means comprise at least one elongated tube, which tube is directed towards the shed with one open end thereof and which can be connected with its other end to means for supplying a medium under pressure. In a first functional embodiment thereof, the orientation means are movably accommodated within the elongated tube.
In another functional embodiment, the first holding element is positioned near the open tube end that faces towards the shed so as to hold or clamp down the rear end of the weft yarn prior to the insertion of the weft yarn. Means may be provided for introducing the weft yarn (in the form of a packed ball of yarn) that is to be inserted into the tube via the open tube end that faces towards the shed. This embodiment is aimed at holding or clamping down the rear yarn end directly beside one side of the shed prior to the insertion of the weft yarn. The ball of weft yarn is to that end introduced into the insertion tube via the exit opening. In another embodiment, the ball of weft yarn is introduced into the insertion tube at the rear side, with the free rear yarn end being moved through the tube in the direction of the first holding element by means of a medium under pressure.
To prevent the ball of yarn from getting stuck or the- forwardly directed rear yarn end from being damaged upon passage of the ball of yarn through the tube in the direction of the shed, the tube is according to the invention provided with a elongated slot extending between the two ends thereof. More specifically, the slot can be closed.
In a functional embodiment, the tube is enveloped by a sleeve with a tight fit, which sleeve is likewise provided with an elongated slot, said tube and said sleeve being movable along their longitudinal axis with respect to each other upon insertion of the weft yarn, from a first position, in which the sleeve closes the slot of
the tube, to a second position, in which the two slots overlap. In this manner the free rear yarn end can easily move aside upon insertion of the ball of weft yarn into the shed without being damaged or otherwise causing any jamming and malfunctioning.
In another embodiment of the weaving device, in which the insertion means are arranged for inserting balls of weft yarn from ball-forming means, which balls of yarn are interconnected by yam portions, the orientation means are according to the invention provided with a cutting element for cutting through a yarn portion at the side of the shed, thus forming a rear yarn end and a front yard end, as well as a retrieving means for retrieving the front yarn end to the ball-forming means.
Said retrieving means may comprise a feed-through tube provided with a longitudinal bore for passage therethrough of the weft yarn to the ball-forming means, which feed-through tube is furthermore provided with at least one opening terminating in the longitudinal bore for supplying a medium under pressure into the longitudinal bore.
Optionally an air-permeating buffer having a capacity geared to the length of the retrieved front yarn end may be provided near one end of the feed- through tube for storing the retrieved front yarn end by means of a medium under pressure. The invention will now be explained in more detail with reference to a drawing in which:
Figure 1 shows a first embodiment of a weaving device according to the invention;
Figure 2 shows a further elaboration of the embodiment that is shown in figure 1 ;
Figures 3-11 show other embodiments of a weaving device according to the invention.
For a clear understanding of the invention, like parts will be indicated by the same numerals in the description of the figures below. Numeral 3 indicates a shed of a weaving device, which shed is built up of warp yarns 2, 4. Cutting means 5 may be disposed directly beside one side of the shed. The weaving device further comprises insertion means 30 for inserting a weft yarn 20 formed into a ball of yam. The weft yarn 20 has a front yarn end 23 and a rear yarn end 21. The ball of yarn 20 is contained in a carrier 24 having an open
rear end 24a. The ball of yarn 20 is introduced into the hollow carrier 24 via the open the rear end 24a prior to insertion into the shed 2, 4, in such a manner that the rear yarn end 21 projects from the open rear end 24a.
As described in Dutch patent application No. 1023943, the ball of yarn 20 is inserted into the shed 2, 4 at a high velocity together with the carrier 24, with the ball of yarn 20 unwinding into a fully extended weft yarn 20 in the shed 2, 4. This situation is shown in subview (B) of figure 1.
To facilitate insertion, the weft yarn 20 has a length such that said length is at least greater than the width of the shed 2, 4. By suitably controlling the insertion means 30, the carrier 24 and the ball of yarn 20 contained therein are inserted into the shed 2, 4 at a velocity and an acceleration such that the weft yarn 20, once it is fully unwound from the carrier 24, will extend the entire width of the shed. The rear yarn end 21 will extend some distance beyond the side of the shed 2, 4 in that situation. Said extra yarn end projecting beyond the fabric 3 to be formed and/or the shed 2, 4 must subsequently be removed by cutting means 5, which leads to yarn waste.
To obviate this drawback as much as possible, the present invention proposes to use orientation means which position in particular the rear yarn end 21 of the weft yarn 20 substantially in line with the side of the shed 2, 4.
In figure 1 the orientation means, indicated at 10, are in particular made up of a fixedly disposed holding element for holding or clamping down the rear yarn and 21 upon insertion of the carrier 24 and the ball of weft yarn 20 contained therein in such a manner that the yarn end 21 is precisely oriented relative to the side of the shed.
In these embodiments, the insertion means are made up of an elongated tube 30 provided with an open exit opening 30a, into which a medium under pressure P can be introduced. The carrier 24 with the ball of yarn 20 contained therein is introduced into the tube 30 and "shot" into the shed at a high velocity by means of the medium under pressure P. The tube end 30b is to that end connected to a source for medium under pressure P.
Upon insertion of the carrier 24 with the weft yarn 20 into the shed 2, 4, the weft yarn 20 fully unwinds into the shed 2, 4. To ensure that the rear yarn end 21 of the weft yarn 20 is precisely oriented relative to the side of the shed 2, 4
by the orientation means 10, a rear yarn end 21 may be provided with a thickening 22, for example a knot, in this embodiment. The thickening may also be in the form of a twisted-together yarn end. The thickening may also be made up of a material other than yam, such as wax, a plastic, glue, dry ice or the like. The thickening 22 ensures that the rear yarn end 21 is caught by the orientation means 10, which orientation means 10 are embodied as a holding element.
An embodiment of such a holding element is shown in figure 2. The orientation means 10 is disposed at the edge of the cloth or fabric 3 (side of the shed 2, 4). The orientation means 10 is embodied as a plate-shaped member provided with an opening 10a, through which the carrier 24 can be passed upon insertion into the shed 2, 4. Disposed near the rear tube end 30b is a second holding element 31 , which holds or clamps down the rear yarn end 21 with the thickening 22 so that the weft yam 20 will unwind into the shed 2, 4 upon insertion of the carrier 24 with the ball of yarn 20.
Once the carrier 24 has passed the opening 10a in the plate-shaped member, a pawl 10b is driven and moved from the position that is shown in subviews (A) and (B) to the position that is shown in subview (C). The pawl 10b is driven by suitable drive means (not shown), which drive the pawl in response to signals being received. Said driving signals can be received from suitable sensors 70, which detect the passage of the carrier 24 through the opening 10a.
In another embodiment, likewise shown in figure 2, said driving of the pawl 10b may also be time-controlled, using the (initial) velocity of the yarn moving past, which is determined by, for example, the pulse characteristic of the medium under pressure P. This obviates the need for additional sensors 70.
The second holding element 31 is turned off (indicated at 31') as soon as the carrier 24 has left the insertion tube 30, so that the rear yarn end 21 is moved through the insertion tube 30 in the direction of the shed 2, 4 together with the thickening 22. The two embodiments that are shown in figure 2 can also be used for inserting weft yarns that are not provided with a thickening at the rear end.
The plate-shaped member 10 is provided with a slot (not shown) extending into the opening 10a, which slot has a diameter substantially equal to the thickness of the weft yarn 20. Since the pawl 10b has been moved to the position
that is shown in subfigure (C) and (D), the weft yarn 20 will be passed through the slot, its movement being arrested the moment the thickening 22 is stopped by the pawl 10b and the slot. At that point, the weft yarn 20 is fully extended in the shed and the rear yarn end 21 is oriented substantially in line with the side of the shed 2, 4. Yarn waste is prevented in this manner.
In another embodiment, the plate-shaped member 10 is not provided with an opening 10a but only with an open slot, which is capable of receiving the weft yarn 20 so as to arrest the weft yarn via the thickening 22, which catches in the slot. More specifically, the plate-shaped member 10 can be positioned in the longitudinal direction of the weft yarn 20 upon insertion thereof. This implies that the weft yarn 20 "skims" along the plate-shaped member upon insertion and is thus introduced into the shed 2, 4.
The moment the weft yarn 20 is to be arrested, the plate-shaped member 10 is positioned in the insertion direction of the weft yarn 20, and the weft yarn is "caught" in the slot. The thickening 22 causes the weft yarn 20 to be caught in the slot and to be arrested in this manner, with the rear yarn end 21 being positioned at the edge of the shed 2, 4.
In to a practical embodiment, the plate-shaped member 10 may be mounted on the mechanism for moving the shed 2, 4, thus achieving an optimum synchronisation between the insertion of the weft yarn 20 and the "catching" or holding of the rear yarn end 21 in the slot.
Another embodiment is shown in figure 3, which shows a great deal of resemblance with the embodiment of figure 2, however.
In this embodiment, too, first and second holding elements 36a and 36b, respectively, are disposed on either side of the insertion means 30 (the elongated insertion tube 30). The first holding element 36a disposed near the open tube exit 30a is not activated upon insertion of the carrier 24 with the ball of yam 20 present therein, in contrast to the second holding element 36b disposed near the rear tube end 30b, which is activated and holds or clamps down the rear yarn end 21. The weft yarn 20 will unwind upon insertion of the carrier 24 and the weft yarn 20 into the shed 2, 4.
After a predetermined period of time during the insertion process, the second holding element 36b will be deactivated, as a result of which the free end 21 will move along through the insertion tube 30 in the direction of the shed 2, 4.
Using a precise(ly) (timed) control of the first holding element 36a, possibly by means of sensors analogously to the embodiments of figure 2, the rear yarn end 21 is caught and accurately positioned with respect to the side of the shed 2, 4.
Optionally, said catching of the rear yarn end 21 can be simplified by providing the yarn end 21 with a thickening 22, as already explained above.
Figure 4 shows a third embodiment of a weaving device according to the invention, in which a movement in the direction of the shed 2, 4 is imparted to the orientation means 33 for orienting the rear yarn end 21 of the weft yarn 20 in line with one side of the shed 2, 4 upon insertion of the weft yarn. The orientation means 33 are to that end configured as a holding or clamping element mounted on a supporting element 32 which is capable of movement towards and away from the side of the shed 2, 4. More in particular, the supporting element 32 forms part of the insertion means for inserting the carrier 24 with the ball of yarn 20 that is present therein. As subview (B) of Figure 4 clearly shows, the supporting element 32 that forms part of the insertion means has been moved towards the shed 2, 4, so that the rear yarn end 21 is oriented with respect to the side of the shed 2, 4 by the holding element 33.
By deactivating the holding element 33 and returning it together with the supporting element 32 to the position as shown in subview (A), the weaving device can be readied for a next "shot" for inserting a next carrier 24 with a ball of weft yarn.
Figure 5 shows another embodiment of the weaving device according to the invention, in which the orientation means for precisely orienting the rear yam end 21 with respect to one side of the shed 2, 4 can be moved towards and away from the shed 2, 4. In this embodiment, the insertion means are again configured as an elongated tube 30 having an open tube end 30a, which faces towards the shed 2, 4, and a rear yarn end 30b. A carrier 24 containing a ball of weft yarn to be inserted is introduced into the tube 30 with each stroke. The orientation means 35, configured as a holding element in this embodiment, are accommodated in the insertion tube 30 near the rear tube end 30b. The holding element 35 holds or clamps down the yarn end 21 that projects from the carrier 24. At the start of the insertion process of the carrier 24 with the weft yarn 20, the carrier 24 is positioned between the orientation means 35 and the front tube end
30a.
The insertion of the carrier 24 takes place by means of a pulse of a medium under pressure P, which is introduced into the tube 30 via the rear tube end 30b. The orientation means 35 are moved through the insertion tube 30 in the direction of the front tube end 30a together with the carrier 24 (and the weft yarn 20). The carrier 24 exits the insertion tube 30 and is "shot" into the shed 2, 4, whilst the orientation means 35 are stopped in the insertion tube 30 near the front tube end 30a by stop means 34, for example projections formed on the inner side of the insertion tube 30. Since the weft yarn is held by the orientation means 35, the weft yarn 20 unwinds into the shed 2, 4. Then the orientation means 35 are deactivated and moved back to the rear of tube end 30b for the next "shot".
Figure 6 shows a fifth embodiment of a weaving device according to the invention. This embodiment comprises a holding element 36 disposed directly beside one side of the shed 2, 4 for holding the rear end 21 of the weft yarn 20. Said holding of the rear yarn end 21 takes place prior to the insertion of the carrier 24 with the ball of weft yarn into the insertion tube 20. In this embodiment, the carrier 24 containing the weft yarn 20 is placed into the tube 30 via the front, open tube end 30a that faces towards the shed 2, 4. As a result, the rear yarn end 21 extends in the tube 30 from the holding element 36 to the rear open end 24a of the carrier 24. The carrier 24 is "launched" from the tube 30 and inserted into the shed 2, 4 by delivering a pulse of a medium under pressure P via the rear tube end 30b. This causes the rear yarn end 21 to be accurately oriented with respect to the side of the shed 2, 4. Figure 7 shows a sixth embodiment of a weaving device according to the invention. This embodiment is a variant of the embodiment that is shown in figure 6, in which the rear yarn end 21 is held or clamped down by the orientation means 37 (in this embodiment configured at as a holding element 37) prior to each "shot". To that end, the rear yarn end 21 is led through the tube 30 in the direction of the holding element 37 from the rear carrier opening 24a by means of a pulse of a medium under pressure P. The carrier 24 is then led into the insertion tube 30, together with the ball of weft yarn, via the rear tube end 30b. The insertion of the carrier 24 with the weft yarn 20 subsequently takes place in the same manner
as in figure 6.
Figure 8 discloses a seventh embodiment of the weaving device according to the invention. This embodiment, too, is a variant of the embodiments that are shown in figures 6 and 7. The rear yarn end 21 is carried to the side of the shed 2, 4 outside the tube 30 upon insertion of the carrier 24 with the weft yarn 20, where it is held by a holding element 37 prior to the insertion of the weft yarn 20. To enable passage of the weft yarn 20 through the tube 30 during the "shot", the tube 30 is provided with an elongated slot 3Of.
This is advantageous in particular in those embodiments in which the outside diameter of the carrier 24 is substantially equal to the inside diameter of the hollow insertion tube 30, as a result of which the rear yarn end 21 being passed through the tube to the shed 2, 4 and held by the holding element 37 is clamped between the carrier 24 and the tube 30. In a special embodiment (not shown), the tube 30 is enveloped by a sleeve with a tight fit, which sleeve is likewise provided with an elongated slot, said tube 30 and said sleeve being movable along a longitudinal axis with respect to each other upon insertion of the weft yarn 20 from a first position, in which the sleeve closes the slot 3Of of the tube 30, to a second position, in which the two slots overlap.
Figure 9 shows an alternative embodiment of the embodiments of a weaving device according to the invention that are shown in figures 6-8. In this embodiment, the tube 30 is provided with an additional bore 30, which is in communication with the open tube end 30b with one end and which is oriented near the first holding element 37 with the other end 40b. The tube 40 functions to feed through the projecting free rear yarn end 21 in the direction of the first holding element 37.
Said feeding through of he free rear yarn end 31 can take place by means of a medium under pressure, which is passed through the bore 40 prior to each "shot", thus moving the free rear yarn end 21 in the direction of the holding element 37, where it is clamped down. The bore 40 is in communication with the longitudinal slot formed in the tube 30, which can be closed by means of a sleeve, as already described with reference to figure 8.
The moment the carrier 24 containing the ball of yarn 20 is "shot" into the shed 2, 4 through the insertion tube 30, the elongated slot is placed into open communication with the bore 40 in the manner as already explained above, so
that the rear yarn end 21 is moved from the open tube end 30b to the other open tube end 30a through the slot and the bore 40 that is in communication therewith, in such a manner that the rear yarn end is precisely oriented on the edge of the shed 2, 4 by the holding element 37, as shown in subview (B) of figure 9. Figure 10 shows a ninth embodiment of a weaving device according to the invention. This embodiment is in particular functional if the weaving device makes use of ball-forming means 45, which form a ball of yarn 20 in a carrier 24 prior to each "shot". The weft yam 20 is to that end taken from a bobbin 6, from which a predetermined length of the weft yarn 20 equal to the width of the shed 2, 4 is taken with each stroke and placed into the hollow carrier 24 by the ball-forming means 45. Then the carrier 24 containing the ball of yarn 20 is "shot" into the shed 2, 4 by means of the insertion tube 30. After the "shot", the weft yarn 20 is cut through at the end of the fabric 3.
The amount of weft yarn 20 that is present in the insertion tube 3 will subsequently be returned to the ball-forming means 45 through the insertion tube 30 by retrieving means 50. The retrieving means are configured as a pawl 52 that can be actuated by means of a drive unit 51 , which pawl is capable of up-and- down movement and of retrieving the weft yam 20 over a predetermined, adjustable distance, so that the cut-through end of the weft yam 20 can be presented to the ball-forming means 45. The cut-through rear yarn end 25 forms the front yarn end 23 for the next ball of yarn 20 to be introduced into the shed 2, 4.
Figure 11 shows a tenth embodiment of a weaving device according to the invention, which can function as an alternative to the embodiment that is shown in figure 10. In the embodiment that is shown in figure 11 , the retrieving means are configured as a feed-through tube 60 provided with a longitudinal bore 61 and having a front tube end 61b and a rear tube end 60a (seen in the direction of insertion of the weft yarn 21 ). The moment a carrier 24 is inserted into the shed 2, 4 by means of the insertion tube 30, the rear yarn end 23 is cut through by the cutting element 5. In order to subsequently return the rear yarn end 23 present in the insertion tube 30 (which forms the front yam end for the new ball of yarn to be introduced) for the next "shot", the feed-through tube 60 is provided with at least one opening 63, two in this embodiment, which is (are) in open communication with the longitudinal bore 61. More specifically, the openings 23 extend at an angle with
respect to the longitudinal bore 61 , having a common, converging point in the longitudinal bore 61. The free yarn end that has been cut loose at the cutting element 5 is blown back through the insertion tube 30 in the direction of the ball- forming means 45 by suitably supplying a medium under pressure via the openings 63. Subsequently a new, empty carrier 24 can be placed in front of the insertion tube end 30b, after which a medium under pressure can be introduced into the longitudinal bore 61 via the inlet opening 62, so that the carrier 24 is filled with an amount of weft yarn equal to at least the width of the shed 2, 4 by means of the ball- forming means 45. The amount of yarn waste can be reduced in an efficient manner with this embodiment as well.
Claims
1. A weaving device comprising means for forming a shed of warp yarns, with insertion means being disposed on one side or both sides of the shed for inserting a weft yarn formed into a closely packed ball of yarn, which packed ball of yarn unwinds into an elongated weft yarn upon insertion into the shed, said weft yarn having a front yarn end and a rear yarn end, seen in the direction of insertion, characterized in that the weaving device comprises means that orient the rear yarn end substantially in line with one side of the shed.
2. A weaving device according to claim 1 , characterized in that the orientation means comprise at least one first holding element for holding the rear yarn end that is to be oriented substantially in line with one side of the shed.
3. A weaving device according to claim 2, characterized in that the orientation means comprise a second holding element disposed before the first holding element, seen in the direction of movement of the weft yarn, for holding the rear yarn end for a predetermined period of time upon insertion of the weft yarn.
4. A weaving device according to claim 2 or 3, characterized in that the first or second holding elements can be driven.
5. A weaving device according to claim 2, 3 or 4, characterized in that the orientation means further comprise sensor means for detecting the position of the rear yam end, which can move freely after said predetermined period of time, and driving the first holding element on the basis of the detected position.
6. A weaving device according to any one or more of the claims 2-5, characterized in that the rear yarn end is provided with a thickening that is to mate with the holding element.
7. A weaving device according to claim 6, characterized in that said thickening is in the form of a knot in the weft yarn or a twisted-together yarn end.
8. A weaving device according to claim 6, characterized in that said thickening is made up of a material other than yarn, for example wax, a plastic, paint, (carbon dioxide) ice.
9. A weaving device according to any one or more of the claims 2-8, characterized in that the first holding element comprises a plate-shaped member disposed beside the side of the shed, which is provided with a slot having a width substantially equal to or greater than the width of the weft yam but smaller than that of the thickening.
10. A weaving device according to claim 9, characterized in that the plate-shaped member can be positioned in the direction of insertion of the weft yarn upon insertion thereof.
11. A weaving device according to claim 9 or 10, characterized in that the first holding element furthermore comprises a drivable pawl, which is disposed directly beside the plate-shaped member and which extends perpendicularly to the direction of insertion and to the slot, which pawl can be moved from a first position on the side opposite the slot to a second position on the side of the slot.
12. A weaving device according to claim 11 , characterized in that the pawl can be moved from said first position to said second position after the packed ball of yarn has passed the plate shaped member during the insertion process.
13. A weaving device according to claim 1 or 2, characterized in that the orientation means can be moved towards and away from the side of the shed.
14. A weaving device according to claim 13, characterized in that the orientation means are placed on a supporting element that can be moved towards and away from the side of the shed.
15. A weaving device according to claim 14, characterized in that the supporting element forms part of the insertion means.
16. A according to any one or more of the claims 1-13, characterized in that the insertion means comprise at least one elongated tube, which tube is directed towards the shed with one open end thereof and which can be connected with its other end to means for supplying a medium under pressure.
17. A weaving device according to claim 16, characterized in that the orientation means are movably accommodated within the elongated tube.
18. A weaving device according to claim 16, characterized in that the first holding element is positioned near the open tube end that faces towards the shed so as to hold or clamp down the rear end of the weft yarn prior to the insertion of the weft yarn.
19. A weaving device according to claim 18, characterized in that means are provided for introducing the weft yarn (in the form of a packed ball of yarn) that is to be inserted into the tube via the open tube end that faces towards the shed.
20. A weaving device according to claim 18, characterized in that blowing means are provided for moving the rear yarn end through the tube in the direction of the first holding element by means of a medium under pressure. 5
21. A according to any one or more of the claims 17-20, characterized in that the tube is provided with a elongated slot extending between the two ends thereof.
22. A weaving device according to claim 21 , characterized in that said slot can be closed.
10 23. A weaving device according to claim 22, characterized in that the tube is enveloped by a sleeve with a tight fit, which sleeve is likewise provided with an elongated slot, said tube and said sleeve being movable along their longitudinal axis with respect to each other upon insertion of the weft yarn, from a first position, in which the sleeve closes the slot of the tube, to a second position, in which the two
15 slots overlap.
24. A weaving device according to any one or more of the claims 20-23, characterized in that the tube is provided with a bore for receiving the rear yarn end, said bore with a first end being in communication with the other end of the tube and being oriented near the first holding element with a second end.
20 25. A weaving device according to any one or more of the preceding
! claims, wherein in which the insertion means are arranged for inserting balls of weft yarn from ball-forming means, which balls of yarn are interconnected by yarn portions, characterized in that the orientation means are provided with a cutting element for cutting through a yarn portion at the side of the shed, thus forming a
25 rear yarn end and a front yard end, as well as a retrieving means for retrieving the front yarn end to the ball-forming means.
26. A weaving device according to claim 25, characterized in that said retrieving means comprise a feed-through tube provided with a longitudinal bore for passage therethrough of the weft yarn to the ball-forming means, which feed-
30 through tube is furthermore provided with at least one opening terminating in the longitudinal bore for supplying a medium under pressure into the longitudinal bore.
27. A weaving device according to claim 26, characterized in that an air-permeating buffer having a capacity geared to the length of the retrieved front. yarn end is provided near one end of the feed-through tube for storing the retrieved front yarn end by means of a medium under pressure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL1027372A NL1027372C2 (en) | 2004-10-29 | 2004-10-29 | Weaving device. |
| PCT/NL2005/000740 WO2006046856A1 (en) | 2004-10-29 | 2005-10-14 | Weaving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1805359A1 true EP1805359A1 (en) | 2007-07-11 |
Family
ID=34974303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05794265A Withdrawn EP1805359A1 (en) | 2004-10-29 | 2005-10-14 | Weaving device |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1805359A1 (en) |
| CN (1) | CN101048541A (en) |
| NL (1) | NL1027372C2 (en) |
| WO (1) | WO2006046856A1 (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2982315A (en) * | 1956-09-05 | 1961-05-02 | Wille Rudolf | Pneumatic weaving method |
| US3831640A (en) * | 1972-07-24 | 1974-08-27 | Crompton & Knowles Corp | Pneumatic loom |
| US4046174A (en) * | 1976-02-25 | 1977-09-06 | Weuger Karl W | Pneumatic loom |
| EP0108183B1 (en) * | 1982-11-08 | 1986-09-10 | GebràDer Sulzer Aktiengesellschaft | Weaving machine |
| US5224521A (en) * | 1991-04-30 | 1993-07-06 | Sulzer Brothers Limited | Weft catcher with gripping device |
| JP3262888B2 (en) * | 1993-04-02 | 2002-03-04 | 津田駒工業株式会社 | Weft control device for loom |
| NL1023943C2 (en) * | 2003-07-17 | 2005-01-18 | Te Strake Textile B V | Weaving device. |
-
2004
- 2004-10-29 NL NL1027372A patent/NL1027372C2/en not_active IP Right Cessation
-
2005
- 2005-10-14 WO PCT/NL2005/000740 patent/WO2006046856A1/en active Application Filing
- 2005-10-14 CN CNA2005800373345A patent/CN101048541A/en active Pending
- 2005-10-14 EP EP05794265A patent/EP1805359A1/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2006046856A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| NL1027372C2 (en) | 2006-05-03 |
| WO2006046856A1 (en) | 2006-05-04 |
| CN101048541A (en) | 2007-10-03 |
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