WO2010084075A1

WO2010084075A1 - Device for driving a shuttle in the reed of a circular loom without contact

Info

Publication number: WO2010084075A1
Application number: PCT/EP2010/050398
Authority: WO
Inventors: Nikolaus Wagner
Original assignee: Starlinger & Co Gesellschaft M.B.H.
Priority date: 2009-01-22
Filing date: 2010-01-14
Publication date: 2010-07-29
Also published as: EP2382346B1; CN102308037A; BRPI1006933A2; AT507299A4; CN102308037B; EP2382346A1; AT507299B1

Abstract

The invention relates to a device for driving a shuttle (1, 1') that can be moved in the reed (17) of a circular loom along a circular orbit (16) without contact, comprising at least one permanent magnet (29, 29') on the shuttle (1, 1') and at least one magnet (22, 22') that is operatively connected to the at least one permanent magnet (29, 29') of the shuttle (1, 1') and that is arranged on a drive element (10) that can be moved concentrically to the orbit (16) of the shuttle, wherein an air gap (11) is formed between the shuttle (1, 1') and the drive element (10). The at least one permanent magnet (29, 29') of the shuttle (1, 1') and the at least one magnet (22, 22') of the drive element (10) are polarized in such a way that the at least one permanent magnet of the shuttle and the at least one magnet of the drive element mutually attract each other by means of magnetic forces and thus form a magnetic attraction section (14).

Description

Device for the non-contact drive of a shooter in Riet a circular loom

The invention relates to a device for non-contact driving a along a circular orbit in Riet a circular looper movable shooter, with at least one permanent magnet on the shooter and at least one with the at least one permanent magnet of the shooter operatively connected magnet on a concentric to the orbit of the shooter movable drive element is arranged, wherein an air gap between the shooter and the drive element is formed.

In the prior art, for example, the following devices for non-contact driving a shooter of a circular loom are known:

EP 0 167 831 A1 proposes a shuttle which, at its rearward side in the direction of movement, is provided with a permanent magnet which is in operative connection with a permanent magnet of the same polarity attached to a revolving drive element and is thus driven by magnetic repulsion forces. An advantage of this invention is that can be dispensed with by the magnetic drive on the recent, mechanically acting and particularly wear prone contact driving means between the shooter and the rotating drive element.

In this embodiment, however, it may occur after starting the machine, since only a smaller force is required to drive the shooter, that the shooter is repelled too much of the rotating permanent magnet of the drive element and therefore leads too far on its circular path.

The AT 390 811 B offers a solution for this. Here, a shuttle with two magnets each mounted at its forward and rearward directions of movement is moved along a circular path by magnetic repulsion forces by two respective same-pole magnets fixed on a rotating drive disk at an appropriate distance from each other. The arranged in the direction of movement on the drive pulley behind the winder magnet drives the shuttle in front of him, the leading magnet on the drive pulley prevents the shuttle from it rushes and leaves its proper position with respect to the drive pulley. A disadvantage of these two embodiments that the geometric design of an air gap by the necessary arrangement of the magnets at the rear and possibly also the front end of the weaving and thus cooperating magnet on the drive element, which are positioned behind or in front of the weaver, but at least obliquely can not be solved in such a way that the danger is eliminated that impose the warp threads guided through the air gap to the magnet. Deflectors on the housing of the weaver could alleviate this problem, but it was not solved. Another disadvantage of the known drive devices for weavers is that the shooter continues to run on his roles in spite of the magnetic drive on his train in Riet, which roll over the drawn through the air gap warp threads. In addition to the mechanical stress on the tapes and the necessary maintenance on trained as wearing parts leadership roles - especially in modern machines with high production capacity, the very fast circulating weald and thus high forces and speeds cause - there is also the risk that threads at the edges of Impose magnets or the guide rollers and be damaged by these.

The object of the present invention is to overcome the known disadvantages of the prior art of such drives of weavers.

This object is achieved in a Webschützen- drive device described above by the features stated in the characterizing part of patent claim 1. Particularly preferred embodiments and developments of the invention are the subject of the subclaims.

A drive device according to the invention has at least one permanent magnet on the contactor and a magnet on the revolving drive element, which are in operative connection with each other and are poled so that they attract each other. By at least one magnetic attraction section between the shooter and the drive element, which is preferably arranged on the underside of the shooter, the shooter is moved with its movement in motion of the revolving drive element in its orbit in Riet. The magnetic attraction acting between the shooter and the drive element is preferably oriented normal to the direction of movement of the shooter. When the drive element is moved, an offset and a magnetic force associated with this offset are no longer imposed on magnetic axis of the attraction section. These shear forces in the attraction section occur even at low slip between shooter and drive element and provide the actual Driving force dar. The air gap between shooter and drive element can be geometrically favorable and large enough to achieve a secure guidance of the warp through the air gap.

In a particularly advantageous embodiment of the invention, the magnetic attraction section - seen in the orbit of the shooter - successively arranged, preferably strip-shaped, permanent magnets with alternating polarity on Sagittarius and successively arranged, preferably strip-shaped, magnets with alternating polarity on the drive element, wherein the permanent magnets of the shooter and the magnets of the drive element facing each other in pairs and are poled so that attract two opposing individual magnets of the shooter or the drive element respectively. Due to the design with several individual magnets with alternating polarity, the magnetic active connection is amplified and the occurring offset between contactor and drive element is limited, since even with the slightest slip, larger shearing forces are transmitted in the direction of movement. For optimum alignment of the magnetic field lines in the magnetic section, the attachment of the individual magnets on a return plate is recommended.

A very strong magnetic operative connection is achieved if the permanent magnets of the shooter are arranged so that their magnetic axes face the drive element, and the magnets of the drive element are arranged so that their magnetic axes are facing the shooter.

In a preferred embodiment of the device according to the invention, at least one magnetic repulsion section is formed between the contactor and the drive element, comprising at least one permanent magnet arranged on the contactor and at least one magnet arranged on the drive element, which are polarized in such a way that they repel each other. This at least one repulsion section between the drive element and the shooter causes normal to the orbit of the shooter, the magnetic attraction of the magnetic attraction section and the weight of the shuttle is compensated, so that a free air gap between shooter and drive element is adjustable without guide rollers. It should be noted that this repulsion portion between the drive member and the shooter does not cancel the shearing forces generated by the magnetic attraction portion between the shooter and the drive member. It should also be mentioned that in this embodiment of the invention of the weavers guide rollers are provided to compensate for centrifugal forces. In a preferred embodiment of the invention, the at least one magnetic repulsion section between contactors and drive element - seen in the orbit of the shooter - side by side, preferably strip-shaped, permanent magnets with alternating polarity on Sagittarius and juxtaposed, preferably strip-shaped, magnets with alternating polarity on the drive element, said the permanent magnets of the shooter and the magnets of the drive element facing each other in pairs and are poled so that two opposing individual magnets of the shooter or the drive element repel each. It is expedient to provide two magnetic repulsion sections between the drive element and the contactor, which are arranged, for example, at the two ends of a longitudinal side of the shooter and between which, ie approximately in the middle of the length of the shooter, the magnetic attraction section is arranged. The sequence of two magnetically repulsive portions and a centrally located, magnetically attracting section ensures a stable flat position between the shooter and the moving drive element with approximately constant gap width. The proposed arrangement of the permanent magnets of the shuttle and the magnets of the drive element, the attractive magnetic forces of the attractive section are compensated by repulsive forces of the repulsion sections, whereby the shear forces generated by the attraction section between the drive element and the shooter are not affected. The individual magnets are arranged side by side on both sides of the shooter, as well as the rotating drive element so that in each case two, separated by an air gap between the shooter and drive element, opposing individual magnets repel each other. Due to the design with several individual magnets with alternating polarity, the stiffness of the magnetic operative connection is also increased here and larger shear forces can be transmitted transversely to the direction of movement at offset. For optimum alignment of the magnetic field lines in the magnetic section, the attachment of the individual magnets to a return plate is also recommended for the magnetic section with mutually repulsive active connection. Furthermore, it is favorable if the permanent magnets of the shooter are arranged so that their magnetic axes to the drive element, and the magnets of the drive element are arranged so that their magnetic axes to protect.

In a variant of the device according to the invention for contactless driving of a shooter in Riet a circular loom, at least one magnetic repulsion portion between the shooter and Riet is formed, comprising at least one permanent magnet arranged on the shooter and at least one Riet arranged magnets which are poled so that they repel each other, wherein the repelling direction of the repulsion portion between the shooter and the Riet counteracts the repelling direction of the repulsion portion between the shooter and the drive element. In this variant according to the invention the shooters can omit altogether vertical, ie conventional, mechanically acting guide devices of the shooter, for example guide wheels or rollers, which support the orbit at right angles to its orbit, as well as the corresponding guideways of the shooter on the reef. Also, the weight forces of the shooter are absorbed by the magnetic repulsion sections. Only for the compensation of the centrifugal forces of the shooter mechanical support devices (wheels on the shooter and a guideway on Riet) are provided, but in a further training, the centrifugal forces can be compensated by magnets on Sagittarius and along the reed.

For optimal magnetic operative connection it is provided that the permanent magnets of the shooter are arranged so that their magnetic axes have to Riet, and the magnets of the reed are arranged so that their magnetic axes to protect.

The shooter's vertical position adjusts within narrow limits depending on the counteracting magnetic repulsion sections between the drive element and the contactor and between the contactors and the reed, and the variable weight of the thread bobbin carried in the contactor. The less production interruptions are required by a bobbin change, the higher the profitability of such weaving machines. Particularly in modern circular looms with high production capacity, the size of the sympathetic thread bobbin has a significant influence on the economy, which is why ever larger bobbins should find space in the shooter. Since the weight of the coil constantly changes during operation of the circular loom, a lighter Sagittarius will take an ever-increasing air gap to the magnet of the drive element with otherwise constant operating conditions until a balance between weight and repulsive forces is achieved. The repulsion section between shooter and reef counteracts this vertical movement. This embodiment of the invention is intended to eliminate all warp-contacting guide means and at the same time to keep the resulting variability of the vertical contactor position and thus the gap width between shooter and drive element or reed in a narrow range. In a simple, inexpensive and maintenance-free operable embodiment of the device according to the invention for non-contact drive of a shooter Riet a loom and for contactless positioning of the shooter in the vertical direction, the magnets are formed on the drive element and / or Riet as a permanent magnet.

The gap width between shooter and drive element can be set even more precise and constant while operating the magnets on the drive element and / or the reed as electromagnets, preferably provided with a suitable control, the movement of the magnet despite variable weights of the coil during operation Ensure contactors on a constant orbit in the reef. By such an interplay of permanent magnets, which are arranged according to the rotating contactors, and, for example, provided on the drive element electromagnet, the width of the air gap between the drive element and the shooter is kept constant regardless of the operating conditions.

This eliminates not only the mechanical drive of the shooter, the burden on the warp and wear is vulnerable, it can also the mechanical acting guide devices of the shooter can be significantly reduced. Such contactless driven or held in orbit contactors is also much quieter in operation. A mechanical load and damage to the warp threads, which are constantly overwhelmed in conventional weaving machines from the mechanical drive and the guide devices of the shooter, also eliminated. The warp threads of the fabric no longer come into contact with a shooter according to the invention in this embodiment.

The invention will now be described in more detail with reference to the figures of exemplary embodiments. Show it:

Fig. 1 is a schematic, perspective view of a first embodiment of the invention;

Figures 2a to 2d in several schematic detail representations of the arrangement of the shooter and the drive element opposite each other individual magnets, which form magnetic sections. Fig. 3 is a schematic perspective view of a second erfϊndungsgemäßen embodiment.

In Fig. 1 is schematically a shooter 1 a circular loom with a housing 2, on which a plurality of support rollers 3, and a plurality of guide rollers 4 are arranged, is shown. The shooter moves along an orbit 16 in the reed of the circular loom, which is not shown in Fig. 1. Also missing for a better overview in the representations of all threads and tapes of the fabric produced in the circular loom. On the inside of the shooter 1 or within its housing 2 is the thread or ribbon spool 5, which is mounted on a cylindrical bobbin holder 7, which is preferably rotatably mounted by means of ball bearings on a holder 6 on the shooter 1. Located on the lower side of the shooter 1 and below the coil 5, a return plate 8 is fixed in a drive device according to the invention, on the underside of which a plurality of individual magnets 9, 9 'and 29, 29' are arranged adjacent to each other with alternating polarity.

In FIGS. 1 to 3, the polarities of the individual magnets are additionally identified by the usual abbreviations "N" for "North Pole" and "S" for "South Pole".

Fig. 1 further shows a part of a drive element 10 of the circular loom, which is moved concentrically to the circular orbit 16 of the shooter 1. The drive element 10 and the shooter 1 close together an air gap 11 with a gap width b. Individual magnets 12, 12 'and 22, 22' with alternating polarity are likewise arranged on the circumference of the drive element 10 and are fastened on the upper side of a return plate 15. The drive element 10 is rotated by a drive device, not shown, for example, the central drive pulley or shaft of the circular loom. The drive element 10 is associated with the shooter 1, wherein in looms usually between four and twelve weavers 1 and as many drive elements 10 along the orbit 16 in the reed are distributed. The permanent magnets 29, 29 'on the contactor 1 and the magnets 22, 22' on the drive element 10 are poled so that they form a magnetic attraction portion 14, which attracts the associated shooter 1 due to the occurrence of shear forces upon rotation of the drive member 10 with it. More specifically, in the magnetic attraction portion 14 - in the orbit 16 of the shooter 1, as seen - the permanent magnets 29, 29 'arranged one behind the other and configured, preferably strip-shaped, with alternating polarity. In the same way, the magnets 22, 22 'of the drive element 10 are arranged one behind the other and configured, preferably strip-shaped, with alternating polarity. The Permanent magnets 29, 29 'of the contactor 1, the magnets 22, 22' of the drive member 10 are opposite so that pairs of magnets are formed, which are poled so that two opposite individual magnets 29, 29 'and 22, 22' of the shooter or each of the drive element. The permanent magnets 29, 29 'of the contactor 1 are arranged so that their magnetic axes to the drive element 10, and the magnets 22, 22' of the drive member 10 are arranged so that their magnetic axes to the shooter 1, 1 'have.

Furthermore, in this embodiment of the invention, two magnetic repulsion sections 13 are formed between the contactor 1 and the drive element 10. These repulsion sections 13 each comprise - seen in orbit 16 of the shooter 1 - arranged side by side, strip-shaped, permanent magnets 9, 9 'with alternating polarity on Sagittarius 1 and juxtaposed, strip-shaped, magnets 12, 12' with alternating polarity on the drive element 10. The permanent magnet 9, 9 'of the shooter 1 and the magnets 12 of the drive element 10 are opposite each other in pairs and are poled so that two opposing individual magnets 9, 9'. or 12, 12 'of the shooter or the drive element repel each. By these repulsion sections 13, the attractive forces of the attraction section 14 and the weight of the shooter 1 is counteracted.

In the present embodiment, the magnetic axes of all magnets are substantially normal to the orbit 16 of the contactor first

FIGS. 2a to 2d show, in several detail views, arrangements of individual magnets on the return plate 8 of the contactor 1 and on the return plate 15 of the drive element 10, respectively.

FIG. 2 a shows a side view of the magnet arrangements along their length. The width b of the air gap 11 between the magnets of the drive element 10 and the overlying contactor 1 can be clearly seen. From left to right, a magnetic section 13 with repulsive operative connection, followed by a magnetic section 14 with attractive active connection, followed by another section 13 with repulsive operative connection. The permanent magnets 9 (permanent magnets 9 'are not visible) of the shooter and the magnets 12 (magnets 12' are not visible) are aligned in the magnetic repulsion sections 13 along the orbit 16 of the shooter 1 in Riet, in the magnetic attraction section 14 are the permanent magnets 29, 29 'of the shooter and the magnets 22, 22' transverse to the orbit 16. In order to achieve a mutually attractive active connection of the magnets in the magnetic attraction section 14, the respectively opposing individual magnets 29, 29 'and 22, 22' are mutually differently poled.

Fig. 2b shows in plan view the lower magnetic plate 15 shown in Fig. 2a as part of the drive element 10. On the yoke plate 15 as described above, two magnetic repulsion sections 13 are provided with a magnetic attraction section 14 arranged centrally, comprising magnets, which with standing in Fig. 2b, not shown, complementary magnets of the opposite shooter in operative connection. Different variants of the design of a magnetic repulsion section 13 are shown in Fig. 2b: The section 13 'shown on the right consists of a single magnet 12 with a polarity "N" (ie the magnetic axis emerges from the drawing) "with three parallel to each other, arranged parallel to the orbit 16 of the shooter 1 individual magnets 12 and 12 'with alternating polarity" N - S -N "Another variant is also shown on the left in Fig. 2a: the magnetic portion 13 points two mutually parallel, along the direction of movement 16 of the shooter 1 arranged individual magnets 12 and 12 'with alternating polarity "N - S" on.

The two figures 2c and 2d show these two last-mentioned embodiments of a magnetic section 13 "with alternating polarity" N - S - N "or a section 13 with alternating polarity" N - S ", respectively in front views.

Fig. 3 shows a shooter 1 ', which represents a development of the shooter 1 of FIG. The shooter 1 of Fig. 3 differs from the shooter 1 of Fig. 1 only in that it is additionally provided on its upper side with a further return plate 8 '. At the top, permanent magnets 39 and 39 'are provided along the orbit 16 of the shooter 1'. These are arranged with the Riet 17 of the loom also along the orbit 16, separated by an air gap 18 from the shooter 1 'individual magnets 19 and 19' in mutually repellent operative connection. By this further magnetic repulsion portion 23, an additional repulsive magnetic force is generated, which pushes the shooter 1 'from Riet 17 down. This additional magnetic force limits the influence of the weight of the coil 5, which becomes ever smaller during operation as a result of the unwinding or weaving of the thread, and thus an approximately constant distance b of the air gap 11 between the revolving drive element 10 and the contactor 1 'in the reed 17 guaranteed. In the embodiment shown in Fig. 3 can be dispensed with the guide rollers 4, as provided in Fig. 1. Only the support rollers 3 are still available for receiving the radially acting centrifugal forces.

In an optimal arrangement of the magnetic sections or when using electromagnets on the drive element or Riet acting on the shooters centrifugal forces can also be compensated by the applied magnetic field. On the support rollers of the shooter no centrifugal forces are then transmitted during operation, the support rollers thus serve only as a safety device, for example in case of failure of the control of the electromagnet.

Claims

Claims:

1. A device for non-contact driving along a circular orbit (16) in Riet (17) of a circular loom movable shooter (1, 1 '), with at least one permanent magnet (29, 29') on the shooter (1) and at least one with the at least one permanent magnet (29, 29 ') of the shooter (1, 1') in operative connection magnet (22, 22 '), which is arranged on a to the orbit (16) of the shooter concentrically movable drive element (10), wherein a Air gap (11) between the shooter (1, 1 ') and the drive element (10) is formed, characterized in that the at least one permanent magnet (29, 29') of the shooter (1, 1 ') and the at least one magnet ( 22, 22 ') of the drive element (10) are poled so that they attract each other by magnetic forces and thus form a magnetic attraction section (14).

2. Apparatus according to claim 1, characterized in that the magnetic attraction section (14) - in orbit (16) of the shooter (1, 1 ') - arranged one behind the other, preferably strip-shaped, permanent magnets (29, 29') with alternating polarity on Protectors (1, 1 ') and successively arranged, preferably strip-shaped, magnets (22, 22') with alternating polarity on the drive element (10), wherein the permanent magnets (29, 29 ') of the shooter (1, 1') and the Magnets (22, 22 ') of the drive element (10) facing each other in pairs and are poled so that attract two opposing individual magnets (29, 29' or 22, 22 ') of the shooter or the drive element respectively.

3. Device according to claim 1 or 2, characterized in that the permanent magnets (29, 29 ') of the shooter (1, 1') are arranged so that their magnetic axes to the drive element (10), and the magnets (22, 22 ') of the drive element (10) are arranged so that their magnetic axes to the shooter (11, 1') have.

4. Device according to one of claims 1 to 3, characterized in that at least one magnetic repulsion portion (13) between the shooter (1, 1 ') and the drive element (10) is formed, comprising at least one of the shooter (1, 1' ) and at least one of the drive element (10) arranged magnets (12, 12 ') which are poled so that they repel each other.

5. The device according to claim 4, characterized in that the at least one magnetic repulsion portion (13) between contactors (1, 1 ') and drive element (10) - in orbit (16) of the shooter (1, 1') seen - arranged side by side , preferably strip-shaped, permanent magnets (9, 9 ') with alternating polarity on the contactor (1, 1') and juxtaposed, preferably strip-shaped, magnets (12, 12 ') with alternating polarity on the drive element (10), wherein the permanent magnets ( 9, 9 ') of the shooter (1, 1') and the magnets (12, 12 ') of the drive element (10) face each other in pairs and are poled so that two opposing individual magnets (9, 9'. 12 ') of the shooter or the drive element repel each.

6. Apparatus according to claim 5, characterized in that the permanent magnets (9, 9 ') of the shooter (1, 1') are arranged so that their magnetic axes to the drive element (10), and the magnets (12, 12 ' ) of the drive element (10) are arranged so that their magnetic axes to the shooter (1, 1 ') have.

7. Device according to one of claims 4 to 6, characterized in that at least one magnetic repulsion portion (23) between the shooter (1, 1 ') and the reed (17) is formed, comprising at least one of the shooter (1, 1' ) and at least one magnet (19, 19 ') arranged on the reed (17), which are polarized in such a way that they repel each other, the repelling direction of the repulsion section (23) between the contactor (1, 1 ') and the reed (17) counteracts the repelling direction of the repulsion section (13) between the shooter (1, 1') and the drive element (10).

8. The device according to claim 7, characterized in that the at least one magnetic repulsion portion (23) between contactors (1, 1 ') and Riet (17) - in orbit (16) of the shooter (1, 1') seen - arranged side by side , preferably strip-shaped, permanent magnets (39, 39 ') with alternating polarity on the contactor (1, 1') and juxtaposed, preferably strip-shaped, magnets (19, 19 ') with alternating polarity on Riet (17), wherein the permanent magnets ( 39, 39 ') of the shooter (1, 1') and the magnets (19, 19 ') of the reed (17) lie opposite one another in pairs and are poled in such a way that two individual magnets (39, 39' or 19, 19 ') of the shooter or Riets repel each.

9. Apparatus according to claim 8, characterized in that the permanent magnets (39, 39 ') of the shooter (1, 1') are arranged so that their magnetic axes for reed (17), and the magnets (19, 19 ') of the reed (17) are arranged with their magnetic axes facing the shooter (1, 1').

10. Device according to one of claims 1 to 9, characterized in that the magnets (12, 12 ', 19, 19') on the drive element (10) and / or on the reed (17) are designed as permanent magnets.

11. Device according to one of claims 1 to 9, characterized in that the magnets (12, 12 ', 19, 19') on the drive element (10) and / or the reed (17) are designed as electromagnets, wherein the magnetic force of Electromagnet is adjustable so that the width of the air gap (11) between the shooter (1) and the drive element (10) is kept constant regardless of the weight of the entrained thread bobbin (5).