WO1996038613A1 - Thread holding device with overlapping holders and insertion components - Google Patents
Thread holding device with overlapping holders and insertion components Download PDFInfo
- Publication number
- WO1996038613A1 WO1996038613A1 PCT/CH1996/000161 CH9600161W WO9638613A1 WO 1996038613 A1 WO1996038613 A1 WO 1996038613A1 CH 9600161 W CH9600161 W CH 9600161W WO 9638613 A1 WO9638613 A1 WO 9638613A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- thread
- holding
- weft
- elements
- holding device
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D41/00—Looms not otherwise provided for, e.g. for weaving chenille yarn; Details peculiar to these looms
- D03D41/005—Linear-shed multiphase looms
Definitions
- Thread holding device with overlapping holding elements and with insertion elements
- the invention relates to a thread holding device with overlapping holding elements and with
- Insertion elements according to the preamble of claim 1 and a row shed weaving machine with a thread holding device are Insertion elements according to the preamble of claim 1 and a row shed weaving machine with a thread holding device.
- a thread or an end section of a weft thread is gripped with a suitable thread holding device in order to hold the thread in the direction of its longitudinal extension and to move it in a direction transverse to the thread.
- Disadvantages of the known thread holding devices are that the detection, holding and guiding of threads can only be reproduced inaccurately and with a low repetition rate.
- a further disadvantage is that the threads align along curves in the known holding devices, which are strongly curved in relation to the guiding direction, and thereby cause faults such as loop and ball formation or a thread backlog in the holding device.
- the disadvantages mentioned have an effect in particular in row shed looms in which a large number of weft threads have to be processed sequentially at a high rate. Under this In the case of row shed weaving machines, there are limits to the production of particularly fine, homogeneous fabrics if the highest machine performance is sought.
- the invention seeks to remedy this.
- the invention as characterized in claim 1, solves the problem of creating a thread holding device with which threads are curved as little as possible in the guide direction and with which a sequential holding of threads in short time intervals, i. H. with a high repetition rate is possible.
- Thread holding device The claim 13 relates to a row shed weaving machine with a thread holding device according to the invention.
- the device according to the invention has the advantage that the thread is held in its longitudinal direction with a frictional force that is much greater than the frictional force in the guide direction transverse to the thread; the transport of the held thread in the guide direction is therefore almost frictionless. It is advantageously of compact construction, which makes it possible to support the held thread during transport through the device in such a way that it always remains drawn and does not form loops. Furthermore, the frictional force can be precisely controlled and can be quickly adapted to changing requirements. Furthermore, a suitable guiding of the relative movement between holding arrangements and insertion elements allows several threads to be inserted simultaneously with several insertion elements for threading into the
- Holding device prepared and can advantageously be threaded in quick succession.
- the thread is displaced relative to the holding elements in the direction in which it is held and guided by the holding elements.
- the holding elements and insertion elements are positioned relative to one another such that a thread section which is in contact with a holding element is located between thread sections which are in contact with insertion elements. It is thereby advantageously achieved that the thread is not or not significantly curved in the direction in which it is held and guided by the holding elements, and the less, the smaller the distance between the insertion elements and the smaller the extent the holding elements in the direction of the longitudinal extension of the thread. The risk of a thread build-up in the thread holding device can be minimized in this way.
- Holding elements in the direction of the longitudinal extension of the thread can be fulfilled particularly advantageously in that the thread is held at one or more points between two lamellae, which overlap in sections along one of their edges, so that the thread winds meandering around the edges. This arrangement ensures the anisotropy and the controllability of the frictional forces.
- Sequential processing of threads with the high repetition rate that occurs in particular with row shed looms is made possible by the device according to the invention in that the insertion elements are moved on a path that does not match sections in the direction in which the threads move from the Holding device are performed.
- a thread transported by an insertion element exerts a forced movement relative to the insertion element and ultimately slides off the latter without subsequently being in contact with the insertion element.
- the insertion element without reversing movement, spatially separates from the holding device on its path and releases the holding device in such a way that the next thread can be fed to the holding device from another insertion element.
- the desired high repetition rate of the thread processing can thus be achieved in that a plurality of insertion elements are circulated on closed paths and, cyclically recurring, insert a weft thread in succession into the holding device.
- the thread holding device according to the invention can advantageously be adapted to the special features of a row shed weaving machine, in that several insertion elements are assigned to each weft channel of the weaving rotor of the machine on the weft and / or catch side, the insertion elements being arranged in a fixed manner with respect to the weaving rotor.
- the holding elements are fixed in space, so that the insertion elements perform the desired relative movement with respect to the holding elements when the weaving rotor is rotating, in order to feed it to the holding elements.
- Advantages of this embodiment of the thread holding device according to the invention can be seen in the fact that the insertion elements differ in terms of their shape and their
- the insertion elements have bullet openings that are adapted to the shape of the profiles of the weft channels. Interference on weft threads at the end of a weft channel are reduced and the reproducibility of the weft insertion is improved. Furthermore, the shape of the insertion elements and the arrangement of the holding elements can be adapted to the weaving rotor and to the alignment of the weaving compartments controlled with the help of the weaving rotor such that the sections of the weft thread that protrude laterally from a weft channel are moved in the same way as the weft thread sections in the weft channel . This uniform treatment of the entire weft thread and the improved reproducibility of the weft insertion creates the prerequisites for the weaving of particularly homogeneous fabrics with row shed weaving machines, whereby the homogeneity of the fabrics is also guaranteed, particularly in the edge area.
- FIG. 1 shows a side view of a section on the catch side of a weaving rotor of a row shed weaving machine with weft channels, a thread holding device with four holding elements arranged in pairs and three insertion elements,
- FIG. 2 is a side view of a pair of holding members, viewed in the direction of FIG.
- FIG. 3 insertion elements for a variety of
- FIG. 4 a comparison of the contours of thread guide elements and Stop elements on a weaving rotor in the form of insertion elements
- FIG. 5 insertion elements when inserting one
- FIG. 6 shows a detailed view of a thread held between two holding elements according to FIG. 1, and
- FIG. 7 shows a preferred arrangement of
- the invention is explained with reference to a row shed weaving machine, whereby the object is achieved by way of example to capture, hold and guide weft threads, which are inserted into the weft channels of the weaving rotor of the loom, at a section protruding from the end of a weft channel by the Section according to the invention supplied with insertion elements of a holding device and along a
- Tangential plane of the weaving rotor is moved, corresponding to the path of a weft on the way to the fabric edge of a fabric that has already been produced. This situation can be transferred analogously to conditions on the shot side.
- the weaving rotor 1 shows a weaving rotor 1 of a row shed weaving machine with a preferred embodiment of a holding device according to the invention.
- the weaving rotor 1 has a cylindrical body 2 which rotates about an axis 3 in
- the weaving rotor 1 is provided with a plurality of weft channels 5 (5a, 5b, 5c, ...) provided, which are arranged at equal intervals and are formed by rows of thread guide elements 6 attached to the circumference of the body 2. Furthermore, stop elements 83 (see FIG. 4) are provided, each of which is arranged downstream of the thread guide elements 6 in the direction of rotation of the rotor.
- the holding device is arranged on the catch side at a distance from the last thread guide element 6 in order to hold a weft thread 20 inserted into a weft channel.
- a suction nozzle 50 is provided, which is arranged downstream of the holding device in the entry direction of the weft thread 20 and stretches the weft thread by means of air drawn in in the direction 51.
- the x, y, z axes of a coordinate system are specified, the z axis lying in the direction of the axis of rotation 3 of the weaving rotor 1.
- the holding device comprises two holding arrangements 40 for holding a thread and three as annular disks 12, hereinafter referred to as insertion element rings, into which the insertion elements which insert the thread into the holding arrangement 40 are integrated.
- the insertion element rings 12 are arranged in parallel and at a distance from one another and are connected to the weaving rotor 1.
- the holding arrangement 40 for holding the thread consists of two lamella-like elements 41, 42, which are fastened at one end, such that the free end of the elements 41, 42 protrudes between two disks 12, specifically in the area the fringe.
- the elements 41, 42 are arranged such that sections of the elements 41, 42 overlap one another and form a gap 44 (see FIG. 6), into which the thread can be inserted.
- the edges 45, 46 of the overlapping Sections are rounded and form sliding surfaces.
- Guide surfaces 55, 56 are formed on the free ends of the holding elements 41, 42, which determine a threading point 48.
- recesses 59 are formed in the outer edge part of the insertion element ring, the number of which corresponds to the number of firing channels or, in other words, a recess 59 is assigned to each firing channel.
- This recess is the essential feature of an 'insertion element', in which
- a section 12A of the insertion element ring is understood which, due to its shape, introduces and moves a weft thread into the holding arrangement 40 during a movement relative to the holding arrangement 40.
- the recess 59 comprises a first section 60 and a second section 61 with a slot 62 which opens into the first section 60.
- the introducer ring 12 has four lugs 91A formed inwardly from the inner periphery.
- the thread guide elements 6 have an opening 32 which determine the weft channel 5 and a slot 33 in order to allow a weft thread to emerge from the thread guide elements.
- the stop elements 83 are designed as free-standing lamellas and have a specially designed edge 84 in the area of the free end in order to advance a weft thread and ultimately to strike it against a fabric edge (not shown).
- FIG. 4 serves to explain criteria according to which the shape of the insertion elements assigned to each shot channel is optimized.
- FIG. 4 shows, viewed in the direction of the axis of rotation 3 of the weaving rotor 1, one Section of a cross section through the weaving rotor 1, the cross section showing the section II in FIG. 1.
- the selected section of the weaving rotor 1 is equipped on its outside with 2 rows of thread guide elements 6 and two rows of stop elements 83, each arranged parallel to the axis of rotation 3 in grooves 90, 91.
- the groove 91 also serves as a guide element for the guide tooth 91A of the insertion element ring 12.
- the contour of the insertion element ring 12 is adapted in sections to the shape of the thread guide elements 6 or
- Stop elements 83 The through-opening 61 and the exit slot 62 correspond in their shape to the opening 32 and the slot 33.
- edges 65 and 63 of the insertion element ring 11 causing the advance of a weft thread have the same contours as the corresponding edges 34, 84 of the thread guide elements 6 and the stop elements 83.
- This adaptation of the shape of the insertion elements has the consequence that an S The weft thread at the location of the insertion elements 12A is moved in the same way as the sections of the thread in the weft channel, namely in such a way that the thread, including the sections carried by the insertion elements, lies in a single radial plane through the axis of rotation 3 of the weaving rotor 1, which also rotates with the weaving rotor.
- Weft threads are as reproducible and stretched as possible Form are applied to the edge of the fabric so that the most homogeneous fabric possible.
- FIG. 6 shows the holding action of the holding elements 41, 42.
- the holding elements pierce, overlapping, each with a sliding edge 45 or 46, the weft direction 25 of the weft thread 20, so that the thread 20 biased by the suction nozzle 50 meanders through the slot 44 the sliding edges 45 and 46 must wind.
- the holding effect of this arrangement is based on two mechanisms: the meandering nestling of the pretensioned thread causes looping friction in the longitudinal direction of the thread, - a sufficiently close distance between the sliding edges 45 and 46 can additionally generate a clamping force on the thread. Both mechanisms create a frictional force that counteracts a tensile force on the thread.
- the weft thread can be moved in the y direction along the sliding edges 45 and 46 and transversely to its longitudinal extent.
- the holding force in the longitudinal direction of the thread is increased by further holding arrangements 40.
- the fact that the wrap friction acts in the longitudinal direction of the thread results in the aforementioned anisotropy of the frictional force. This anisotropy can be increased accordingly by further holding arrangements 40.
- the same holding arrangements and insertion elements can be used as previously mentioned; in this configuration, however, the weft thread would be held taut with a device other than the aforementioned suction nozzle 50 before threading into the holding arrangement.
- each holding arrangement 40 is between when threading a thread two insertion elements 12A and that the spaces 15, 16 are chosen as narrow as possible. According to these basic rules, the number of holding arrangements 40 and insertion elements 12A per firing channel can be increased as desired.
- FIG. 5 shows the threading of the weft thread 20 into the holding arrangement 40 by means of two insertion elements 12A, which are each assigned to a weft channel and are moved past the holding arrangement on both sides. Both insertion elements are positioned so that they overlap when viewed in the z direction. Furthermore, from FIG. 5 shows how the weft thread 20 is pushed between the holding elements 41 and 42 and guided along the sliding surfaces 45 and 46 with the insertion elements 12A. The insertion element 12A executes a rotational movement about the center point of the axis of rotation 3 in the direction A. When inserting between the holding elements 40 and 41, the weft thread 20 lies at the edge 65 of the through-opening 61.
- the holding elements 40 and 41 are positioned such that the weft thread 20 extends from the edge 65 against one of the guide edges 55 or 56 and upon further movement of the insertion element 12A at the threading point 48 between the holding elements 41, 42, the guide edges 55 and 56 continuously advancing the meandering course of the weft thread according to FIG. Force 6.
- the weft thread 20 is positively guided by the edges 45, 55, 46, 56. These edges are oriented such that they are generally not tangent to the direction of movement of the insertion element 12A. Accordingly, the edges 45, 55, 46, 56. These edges are oriented such that they are generally not tangent to the direction of movement of the insertion element 12A. Accordingly, the edges 45, 55, 46, 56. These edges are oriented such that they are generally not tangent to the direction of movement of the insertion element 12A. Accordingly, the edges 45, 55, 46, 56.
- Thread a relative movement with respect to the insertion element 12A According to FIG. 5, the thread moves away from the center of rotation 3 along the edge 65, in order to finally close the through-opening 61 through the outlet slot 62 at a specific position of the insertion element 12A leave. At this moment, the thread 20 is in the angular position B. In this position, no shear force is transmitted to the weft thread 20 along the sliding surfaces 45 and 46 as long as the thread 20 is in the area of the edge 64 of the insertion element 12A: the edge 64 is designed as a circular arc element around the center of the axis of rotation 3 and is therefore always tangential to the direction of movement of the insertion element 12A.
- the weft thus remains motionless between the holding elements 45 and 46 until it is reached by the edge 63, which pushes it further as long as it moves to the angular position C.
- the angular position C of the edge 63 corresponds to the position 21 of the thread in the holding arrangement 40, where the thread remains without being in contact with the insertion elements 12A. Accordingly, the spatial course of the edges 65, 64, 63 determines the time course of the forced movement of the weft thread along the sliding surfaces 45 and 46, the monotonous rotary movement of the insertion element being implemented as a non-monotonous movement of the thread.
- the holding elements 41, 42 are ready to receive a further weft thread, which is transported by another introducer.
- the use of a large number of insertion elements, which move past the holding elements one after the other, in a similar manner and without reversing the movement, enables weft threads to be inserted into the holding device at a particularly high rate.
- the insertion element rings 12 are suitable for being pushed over a weaving rotor.
- the lugs 91A on the inside of the ring in FIG. 3 provided. These have the function of guide teeth which are adapted to corresponding grooves 91 on the outside of a weaving rotor (FIG. 4).
- the displaceability of the insertion elements along the axis of rotation of the weaving rotor makes it easier to change the weaving width of the row shed loom. To change the weaving width, only thread guide elements 6 and stop elements 83 on the weaving rotor have to be removed and
- Insertion element rings 12 are moved without the length of the weaving rotor itself having to be changed. Furthermore, holding elements according to FIG. 1 can be moved, which is not a problem due to their compactness.
- a thread holding arrangement according to FIG. 2 has a precisely defined and controlled positionable threading point 48 due to the dimensions of the holding elements 41, 42 compared to the diameter of a weft thread. Furthermore, it is possible to change the frictional resistances of the thread holding arrangement appropriately and longitudinally by precise displacement or tilting of the holding elements 41 of the sliding surfaces 45, 46 (ie in the y direction in FIG. 2) as a function of the position of the thread. That is z. B. reached by changing the overlap of the holding elements in order to change the wrap friction.
- FIG. 7 gives an example of how the controllability of the threading points of the holding elements can be used in order to feed weft threads particularly gently on the weft and catch side by distributing the changes in the thread tension occurring when entering the thread holding devices as evenly as possible over the entire thread length.
- Holding arrangements are only held in its longitudinal direction before it is caught by the holding arrangements on the catch side. Furthermore, the
- the weft thread is held first at the portions of the thread that are furthest away from one end of a weft channel.
- tensions which are generated in the weft thread when threading into a holding arrangement due to the meandering shape can always be distributed over the entire length of the thread, ie a distance between a holding arrangement on the weft side and a holding arrangement on the catch side.
- This situation is in FIG. 7 symbolically represented by specifying the relative positions of the weft thread 20 moving in the direction 20A and the threading points 48A-F of 6 holding arrangements 40, the alignment of their sliding surfaces 45, 46 coinciding with the direction 20A.
- the threading points 48A-C are on the weft side
- the threading points 48D-F are arranged on the catch side.
- the device for holding a thread comprises at least one holding arrangement 40 consisting of two overlapping holding elements 41, 42 for the thread 20 and at least two insertion elements 12, which are moved relative to the holding elements by one transverse to the direction of movement of the insertion elements and transverse to the holding elements running thread 20 between the
- the thread being held in its longitudinal direction and being moved transversely thereto, along the holding elements 41, 42.
- the thread is biased in its longitudinal direction.
- the thread holding device can be used in such a way that the insertion elements are moved on a circular path, the thread moving away from the center of the circular path and detaching from the insertion elements.
- Several threads 20 are prepared simultaneously with several insertion elements 12 for threading into the holding device and are threaded in a rapid sequence.
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU52683/96A AU5268396A (en) | 1995-06-02 | 1996-04-26 | Thread holding device with overlapping holders and insertion components |
EP96909004A EP0828880B1 (en) | 1995-06-02 | 1996-04-26 | Thread holding device with overlapping holders and insertion components |
DE59605312T DE59605312D1 (en) | 1995-06-02 | 1996-04-26 | THREAD HOLDING DEVICE WITH OVERLAPPING HOLDING ELEMENTS AND WITH INSERTION ELEMENTS |
JP8536069A JPH11505897A (en) | 1995-06-02 | 1996-04-26 | Weft holding device with superimposed holding element and guide element |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1640/95-6 | 1995-06-02 | ||
CH164095 | 1995-06-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996038613A1 true WO1996038613A1 (en) | 1996-12-05 |
Family
ID=4215196
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CH1996/000161 WO1996038613A1 (en) | 1995-06-02 | 1996-04-26 | Thread holding device with overlapping holders and insertion components |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0828880B1 (en) |
JP (1) | JPH11505897A (en) |
AU (1) | AU5268396A (en) |
DE (1) | DE59605312D1 (en) |
WO (1) | WO1996038613A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1020549A1 (en) * | 1998-12-24 | 2000-07-19 | Sulzer Textil AG | Weft yarn retaining device for a multiphase loom and multiphase loom with such a device |
US6213161B1 (en) | 1998-12-24 | 2001-04-10 | SULZER RüTI AG | Holder apparatus for weft thread in a series shed weaving machine |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7022492B2 (en) | 2003-12-15 | 2006-04-04 | Dade Behring Inc. | Ecstasy haptens and immunogens |
US6991911B2 (en) | 2003-12-15 | 2006-01-31 | Dade Behring Inc. | Assay for entactogens |
US7037669B2 (en) | 2004-03-22 | 2006-05-02 | Dade Behring Inc. | Assays for amphetamine and methamphetamine using stereospecific reagents |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH550874A (en) * | 1972-03-17 | 1974-06-28 | Vnii Legkogo Textil Masch | DEVICE FOR HOLDING THE END OF THE WEFT ON SHUTTERLESS WEAVING MACHINES. |
FR2340386A1 (en) * | 1976-02-06 | 1977-09-02 | Inst Legkogo Textilnogo Mashin | WEFT END HOLDING DEVICE ON A WEAVING Loom |
FR2634230A1 (en) * | 1988-06-27 | 1990-01-19 | Tagawa Kikai Kk | WEFT END PROCESSING DEVICE FOR NON-SHUTTLE WEAVING |
EP0582763A1 (en) * | 1992-08-11 | 1994-02-16 | Sulzer RàTi Ag | Device for retaining weftyarns in linear shed multiphase looms |
-
1996
- 1996-04-26 AU AU52683/96A patent/AU5268396A/en not_active Abandoned
- 1996-04-26 JP JP8536069A patent/JPH11505897A/en active Pending
- 1996-04-26 WO PCT/CH1996/000161 patent/WO1996038613A1/en active IP Right Grant
- 1996-04-26 DE DE59605312T patent/DE59605312D1/en not_active Expired - Fee Related
- 1996-04-26 EP EP96909004A patent/EP0828880B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH550874A (en) * | 1972-03-17 | 1974-06-28 | Vnii Legkogo Textil Masch | DEVICE FOR HOLDING THE END OF THE WEFT ON SHUTTERLESS WEAVING MACHINES. |
FR2340386A1 (en) * | 1976-02-06 | 1977-09-02 | Inst Legkogo Textilnogo Mashin | WEFT END HOLDING DEVICE ON A WEAVING Loom |
FR2634230A1 (en) * | 1988-06-27 | 1990-01-19 | Tagawa Kikai Kk | WEFT END PROCESSING DEVICE FOR NON-SHUTTLE WEAVING |
EP0582763A1 (en) * | 1992-08-11 | 1994-02-16 | Sulzer RàTi Ag | Device for retaining weftyarns in linear shed multiphase looms |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1020549A1 (en) * | 1998-12-24 | 2000-07-19 | Sulzer Textil AG | Weft yarn retaining device for a multiphase loom and multiphase loom with such a device |
US6213161B1 (en) | 1998-12-24 | 2001-04-10 | SULZER RüTI AG | Holder apparatus for weft thread in a series shed weaving machine |
Also Published As
Publication number | Publication date |
---|---|
JPH11505897A (en) | 1999-05-25 |
EP0828880B1 (en) | 2000-05-24 |
AU5268396A (en) | 1996-12-18 |
DE59605312D1 (en) | 2000-06-29 |
EP0828880A1 (en) | 1998-03-18 |
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