ELECTROMOTIVELY OPERATING DEVICE FOR FORMING A LENO SELVEDGE FOR A LOOM AND A PROJECTILE LOOM HAVING SUCH A DEVICE

Abstract

The invention relates to an electromotively operating device (1) for forming a leno selvedge, comprising a rotor (10) having two thread-guide eyelets (14) arranged diagonally opposite each other in the rotor (10) for the leno threads, and a stator (30) accommodating the rotor (10). The rotor (10) has a magnetic disk (16), wherein the magnetic disk (16) has a plurality of alternately positive and negative magnetized segments (17), which are oriented in an axial direction of the rotor (10).

Claims

1.-13. (canceled)

14. An electromotively operating apparatus for forming a leno selvage comprising: a rotor having two thread guiding eyes arranged diagonally opposite one another in the rotor for the leno threads, the rotor having a magnetic disk, the magnetic disk having a plurality of alternately positively and negatively magnetized segments that are aligned in an axial direction of the rotor; and a stator receiving the rotor, the stator having a spool holder configured to receive a plurality of spools.

15. An electromotively operating apparatus in accordance with claim 14, wherein the number and arrangement of the spools in the spool holder are selected such that tilt moments exerted on the rotor by the spools are canceled when two or more spools have current applied simultaneously and identically.

16. An electromotively operating apparatus in accordance with claim 15, wherein the spool holder has four spools, with two respective spools forming a spool pair being arranged diagonally opposite one another in the spool holder, with the spools of a spool pair having current applied at the same time in an identical manner.

17. An electromotively operating apparatus in accordance with claim 15, wherein the spool holder receives six spools, with a respective three spools arranged at an angle of 120 with respect to one another being able to have current applied at the same time and in an identical manner.

18. An electromotively operating apparatus in accordance with claim 14, further comprising spools that are kidney shape.

19. An electromotively operating apparatus in accordance with claim 14, wherein the spool holder of the stator is formed from an electrically non-conductive material, to avoid eddy currents.

20. An electromotively operating apparatus in accordance with claim 19, wherein the electrically non-conductive material is plastic.

21. An electromotively operating apparatus in accordance with claim 14, wherein the spool holder of the stator has slits for receiving yokes.

22. An electromotively operating apparatus in accordance with claim 14, wherein the rotor has a collet for receiving the magnetic disk and a bearing, with the collet having the two thread guiding eye disposed diagonally opposite one another.

23. An electromotively operating apparatus in accordance with claim 22, wherein the thread guiding eyes have inserts for wear protection.

24. An electromotively operating apparatus in accordance with claim 22, wherein the bearing is a roller element bearing.

25. An electromotively operating apparatus in accordance with claim 14, further comprising a control, with a current application to the spools taking place by the control.

26. A projectile loom having at least one cutting lane for dividing the fabric web, comprising: at least one apparatus in accordance with claim 1 arranged in the at least one cutting lane.

27. A projectile loom in accordance with claim 26, wherein a warp beam of the projectile loom is configured as continuous.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The invention will be described in more detail below by way of example with reference to the drawings.

[0025] FIG. 1 shows two electromotively operating apparatus for forming a respective leno selvage with an indicated fabric in a perspective representation;

[0026] FIG. 2 shows the apparatus in accordance with the invention for forming a leno selvage in an exploded representation;

[0027] FIG. 3 shows a half-section through the apparatus in accordance with the invention for forming a leno selvage in accordance with FIG. 2; and

[0028] FIG. 4 schematically shows the arrangement of six spools in the spool holder.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0029] In accordance with FIG. 1, two apparatus 1 are shown for forming a respective leno selvage each, wherein a slight distance is provided between the two apparatus to guide the leno threads 20, which are guided by the thread eyes 14, in the direction of the weft beam.

[0030] The subject of the invention is now in accordance with a first embodiment the configuration of the electromotively operating apparatus for forming a leno selvage in accordance with FIGS. 2 and 3. The apparatus shown in the form of an exploded drawing in FIG. 2 for forming a leno selvage comprises the components of a rotor 10 and of a stator 30 receiving the rotor 10. The stator marked as a whole by 30 comprises the reel holder 32 that serves the reception of the kidney-shaped spools 34a to 34d. The spool holder 32 shows axially arranged slits 36 that serve the reception of the yokes marked by 38. The yokes form the four magnetic circuits with the four spools. The stator 30 furthermore comprises the return plate 40 that likewise shows slits 43 for receiving yokes 44.

[0031] The spools 34a to 34d arranged in the spool holder 32 are arranged in the spool holder such that two respective spools 34a and 34c and 34b and 34d are arranged directly diagonally opposite one another, that is at an angle of 180, in the spool holder 32. The spools 34a, 34c and 34b, 34d disposed directly diagonally opposite one another have current applied simultaneously in an identical manner by the control. It is hereby achieved that no oscillating moments can be exerted on the rotor via the magnetic disk 16 of the rotor 10. If the control of the spool in accordance with the invention were not carried out, there would be the risk that the rotor would oscillate due to production tolerances, and here in particular in the bearing, with an application of current to the individual spools carried out one after the other, for example. Since now the spools 34a to 34d arranged diagonally opposite one another in the spool holder 32 have the same current applied simultaneously, such oscillating movements substantially do not occur. This also prevents the arising of resonances. This means that the damping of resonances is of decisive importance for the optimum operation of stepper motors because step losses due to the excitation of the oscillatory system comprising the combination of mechanical, electrical, and magnetic components can thereby be avoided, in particular at critical speeds. Finally, the microstep operation also serves the avoidance of resonances due to an approximately continuous application of current. While avoiding large abrupt jumps in the current development, high frequency excitations and resonances of the oscillatory system, and thus ultimately step losses, are avoided.

[0032] In the schematic representation in accordance with FIG. 4 in which six spools 35a to 35f are arranged at an angle of 120 with respect to one another in the spool holder 32, the simultaneous and identical application of current takes place on a respective three of the spools 35a, 35c and 35e or of the spools 35b, 35d, and 35f arranged at an angle of 120 to avoid oscillating movements of the rotor.

[0033] The rotor 10 comprises the collet 12, with the collet 12 having the two thread guiding eyes 14 disposed diagonally opposite one another for guiding the leno threads. The thread guiding eyes 14 accept inserts 15 that serve as wear protection. The collet 12 furthermore supports the magnetic disk 16, with the magnetic disk having a plurality of magnetized segments 17 that are axially aligned on the circumference and that are each poled in opposite senses to one another. The collet 12 furthermore receives the bearing marked by 18 and having the bearing race 19, with the bearing 18 ensuring that the collet 12 can rotate relative to the spool holder 32.

REFERENCE NUMERAL LIST

[0034] 1 electromotive apparatus for forming a leno selvage [0035] 10 rotor [0036] 12 collet [0037] 14 thread guiding eyes [0038] 15 insert [0039] 16 magnetic disk [0040] 17 magnetized segment [0041] 18 bearing [0042] 19 bearing race [0043] 20 leno threads [0044] 30 stator [0045] 32 spool holder of the stator [0046] 34a spool [0047] 34b spool [0048] 34c spool [0049] 34d spool [0050] 35a spool [0051] 35b spool [0052] 35c spool [0053] 35d spool [0054] 35e spool [0055] 35f spool [0056] 36 slit in the spool holder for receiving the yoke [0057] 38 yoke [0058] 40 return plate of the stator (spool holder) [0059] 42 slit in the return plate [0060] 44 yoke