Rotating leno selvage device with direct electromagnetic drive to a leno disk

• US 6,006,793 A
• Filed: 07/27/1998
• Issued: 12/28/1999
• Est. Priority Date: 08/01/1997
• Status: Expired due to Fees

• Current Assignee: Lindauer Dornier Gesellschaft Mit Beschrã¤Nkter Haftung (Mercedes-Benz Group AG)
• Original Assignee: Lindauer Dornier Gesellschaft Mit Beschrã¤Nkter Haftung (Mercedes-Benz Group AG)
• Inventors: Krumm, Valentin, Holz, Hans-Joachim, Haeussler, Horst
• Primary Examiner(s): FALIK, ANDREW M
• Application Number:
  US09/123,571
• Time in Patent Office: 519 Days
• Field of Search: 139/54, 139/50, 310/67 R, 310/266-268
• US Class Current: 139/54
• CPC Class Codes: D03C 7/04 Mechanisms having discs oscillating about a weftwise axis and having apertures for warp threads
• CPC Class Codes: H02K 11/21 Devices for sensing speed or position, or actuated thereby specially adapted for machines having non-mechanical commutating devices H02K29/06, H02K29/14
• CPC Class Codes: H02K 11/22 Optical devices
• CPC Class Codes: H02K 11/225 Detecting coils
• CPC Class Codes: H02K 7/088 radially supporting the rotor directly
• CPC Class Codes: H02K 7/14 Structural association with mechanical loads, e.g. with hand-held machine tools or fans with fan or impeller for cooling the machine H02K9/06

Abstract

A rotating leno forming device includes a leno disk (3) that has leno thread guides (5) therein and that itself forms a part of the rotor (2) of an electromagnetic drive arrangement. In order to achieve a very compact bearing support arrangement, shield the moving parts against external contamination, and provide for the detection of the rotational position of the leno disk, the leno device further includes a roller or ball bearing (6) of which the outer bearing race (6A) is rigidly connected to the leno disk (3), and of which the inner bearing race (6B) is rigidly connected to a centering holder (9) that is rigidly connected to a housing (8) of the leno device. Permanent magnets (7) are arranged around the circumference of the rotor (2) and cooperate with an electromagnetic stator (11) secured in the housing (8). A position sensor system (10) includes at least one signal emitter (13) mounted on the rotor (2) and a plurality of signal receivers or sensors (14) mounted on the housing (8).

Claims

1. A leno selvage device for a loom, comprising

a housing adapted to be connected to the loom,

a first rolling contact bearing including a first outer bearing race and a first inner bearing race, wherein said first inner bearing race is arranged coaxially radially within said first outer bearing race and is supported by said housing,

an electromagnetic stator secured within said housing,

a rotatable leno disk that has at least one leno thread guide adapted to guidingly receive a leno thread therein, and that is secured to said first outer bearing race for rotation therewith, and

a plurality of permanent magnets secured around a circumference of said leno disk and spaced with a gap relative to said electromagnetic stator for electromagnetic interaction is therewith.

2. The leno selvage device according to claim 1, further comprising a centering holder that is rigidly or integrally connected with said housing and that supports said first inner bearing race.

3. The leno selvage device according to claim 2, wherein said housing comprises a housing side wall and said centering holder comprises a flange rim protruding toward said first rolling contact bearing from said housing side wall.

4. The leno selvage device according to claim 2, wherein said housing comprises a housing side wall and said centering holder comprises a groove in said housing side wall facing said first rolling contact bearing.

5. The leno selvage device according to claim 2, wherein said centering holder is arranged coaxially and rotationally uniformly about a center axis of said leno selvage device.

6. The leno selvage device according to claim 2, wherein said first inner bearing race is secured to said centering holder so as to prevent relative rotation therebetween.

7. The leno selvage device according to claim 1, wherein said rolling contact bearing is a bearing selected from the group consisting of a roller bearing including rollers arranged between said first inner and outer bearing races, and a ball bearing including balls arranged between said first inner and outer bearing races.

8. The leno selvage device according to claim 1, wherein said housing, said electromagnetic stator and said first inner bearing race together form a stationary structural unit, and wherein said leno disk, said first outer bearing race and said permanent magnets together form a rotatable structural unit that is rotatable relative to said stationary structural unit.

9. The leno selvage device according to claim 8, further comprising one of an angle measuring system and a path distance measuring system for measuring a rotational angular position of said rotatable structural unit, including at least one signal emitter mounted on said rotatable structural unit.

10. The leno selvage device according to claim 9, wherein said signal emitter is one of an electromagnetically detectable signal emitter and an optically detectable signal emitter.

11. The leno selvage device according to claim 9, wherein said one of an angle measuring system and a path distance measuring system is an absolutely measuring incremental measurement system that further includes at least one signal receiver mounted on said stationary structural unit axially adjacent said at least one signal emitter, and that is adapted to sense and absolutely locate an incremental position of said at least one signal emitter using said at least one signal receiver.

12. The leno selvage device according to claim 9, wherein said one of an angle measuring system and a path distance measuring system further includes a plurality of signal receivers arranged on said stationary structural unit and adapted to sense said at least one signal emitter.

13. The leno selvage device according to claim 12, wherein said at least one signal emitter comprises a plurality of signal emitters arranged distributed circumferentially around said rotatable structural unit.

14. The leno selvage device according to claim 9, wherein said at least one signal emitter is particularly mounted on said leno disk of said rotatable structural unit.

15. The leno selvage device according to claim 9, wherein said at least one signal emitter is particularly mounted on said first outer bearing race of said rotatable structural unit.

16. The leno selvage device according to claim 1, wherein said leno disk comprises an annular ring with an open center hole at an axial center of said disk, and at least one lug protruding radially inwardly from said annular ring with said at least one leno thread guide provided therein.

17. The leno selvage device according to claim 16, wherein said leno disk comprises two of said lugs protruding radially inwardly from said annular ring at diametrically opposed locations, and two of said leno thread guides respectively provided on said two lugs.

18. The leno selvage device according to claim 16, wherein said housing comprises an annular enclosure with a housing opening at an axial center of said annular enclosure, said leno disk is arranged with said open center hole coinciding with said housing opening such that said at least one lug of said leno disk protrudes radially inwardly into said housing opening.

19. The leno selvage device according to claim 18, wherein said annular enclosure is so arranged that only one axially-facing side face of said annular ring, said at least one lug, and a radially inwardly facing surface of said first inner bearing race are exposed externally of said annular enclosure.

20. The leno selvage device according to claim 18, wherein said annular enclosure encloses an annular interior space therein and has a radially inwardly facing circumferential slot, and wherein said first bearing, said stator, said annular ring and said magnets are received and enclosed in said annular interior space, and said at least one lug protrudes radially inwardly through said circumferential slot.

21. The leno selvage device according to claim 16, wherein respective free motion clearances are provided between said annular ring and said first inner bearing race, between said at least one lug and said first inner bearing race, and between said annular ring and said housing.

22. The leno selvage device according to claim 1, wherein said gap between said magnets and said stator is a cylindrical annular air gap.

23. The leno selvage device according to claim 1, wherein said leno disk comprises an annular ring having a substantially L-shaped cross-section, and said leno disk is rigidly connected to said first outer bearing race.

24. The leno selvage device according to claim 23, including only said first rolling contact bearing and no further rotational bearing, wherein said annular ring is arranged axially adjacent said first rolling contact bearing with an outer circumference of said annular ring arranged flush with an outer circumference of said first outer bearing race, and said magnets are arranged on at least said outer circumference of said first outer bearing race.

25. The leno selvage device according to claim 1, further comprising a second rolling contact bearing including a second outer bearing race and a second inner bearing race arranged radially inwardly coaxially within said second outer bearing race, wherein said leno disk comprises an annular ring having a substantially T-shaped cross-section, and said leno disk is rigidly connected to said first and second outer bearing races.

26. The leno selvage device according to claim 25, wherein said first and second rolling contact bearings are arranged coaxially with one another and axially adjacent one another with a spacing gap therebetween, wherein said annular ring includes a radially extending annular disk and an axially extending cylindrical rim adjoining a radially outer edge of said annular disk, wherein said annular disk passes between said first and second rolling contact bearings through said spacing gap and said cylindrical rim is arranged radially outwardly around and rigidly connected to an outer circumference of said first and second outer bearing races, and wherein said magnets are arranged on an outer circumference of said cylindrical rim.

27. The leno selvage device according to claim 25, wherein said first and second inner bearing races are respectively connected to said housing so as to prevent relative rotation therebetween.