US3308614A

US3308614A - Apparatus for false-twisting textile threads

Info

Publication number: US3308614A
Application number: US529145A
Authority: US
Inventors: Stahlecker Fritz
Original assignee: Individual
Current assignee: Individual
Priority date: 1965-02-22
Filing date: 1966-02-21
Publication date: 1967-03-14
Anticipated expiration: 1984-03-14
Also published as: DE1510932A1

Description

March 14, 1967 F. STAHLECKER 3,308,614

APPARATUS FOR FALSE-TWISTING TEXTILE THREADS Filed Feb. 21, 1966 4 Sheets-Sheet l INVENTOR Fen-z smuuacxee,

ATTORNEKQ March 14, 1967 STAHLECKER 3,308,614

APPARATUS FOR FALSE-TWISTING TEXTILE THREADS Filed Feb. 21, 1966 4 Sheets-Sheet 2 Fig.3

INVENTOR Fe/Tz 877114450451 ATTORNEYS March 14,1967 F. STAHLECKER 3,308,614

APPARATUS FOR' FALSE-TWISTING TEXTILE THREADS Filed Feb. 21, 1966 4 Sheets-Sheet 3 Fig.5

52 H a 52b 2b INVENTOR E/"r1. STHHLECKEZ.

BY 4 1A) 447 ATTORNEYS March 14, 1967 STAHLECKER 3,308,614

APPARATUS FOR FALSE-TWISTING TEXTILE THREADS Filed Feb. 21, 1966 4 Shegts-Sheet 4 Fig.7

INVENTOR F 21 TZ. STRHLECK ATTORNEYS 3,308,614 APPARATUS FOR FALSE-TWISTING TEXTILE THREADS Fritz Stahlecker, Uhlandstrasse 18, Bad Ubcrkingen, Wurttemberg, Germany Filed Feb. 21, 1966, Ser. No. 529,145 Claims priority, application Germany, Feb. 22, 1965, S 95,590, S 95,591 10 Claims. (Cl. 57-77.45)

The present invention relates to an apparatus for falsetwisting individual textile threads by means of twisting elements, especially false-twisting tubes, which are adapted to rotate at an extremely high speed and are pressed against driving surfaces of a rotary driving element merely by the magnetic attraction which is produced by holding magnets, and which are held by these magnets in engagement with this driving element and in a fixed position relative to these magnets so that these false-twisting tubes are prevented from shifting in tangential directions on the driving element.

In such apparatus for false-twisting individual textile threads by means of false-twisting tubes it is well-known to employ cup-shaped driving elements and to produce the necessary contact pressure between the false-twitsing tubes and the driving elements for driving these tubes by means of holding magnets. However, these driving elements have certain disadvantages insofar as their stability and quietness of operation is concernedif the false-twisting tubes are to :be driven by them at a very high speed, for example, of 400,000 to 600,000 r.p.m. as required in modern production.

Other known apparatus of this type are provided with at least one driving element with two parallel rollershaped disks. If these apparatuses are operated at the high speeds as mentioned above or if several false-twisting tubes are to be driven by the same driving element, the following disadvantages occur. Because of their large diameter these driving elements are relatively heavy and it is also extremely difficult to make the two disks of exactly the same diameter andlto insure that they will run exactly true. It is impossible to make the axial distance between the magnets or pole pieces and the driving disks as small as required for insuring that the false-twisting tube will run exactly true. A very small continuous gap would then extend along the entire area between the magnets and driving disks, and this gap would collect dust or fly and also produce an accumulation of heat.

It is an object of the present invention to provide an apparatus for false-twisting individual textile threads in which the driving element is capable of running as stable and true as required for driving the false-twisting tube at very high speeds, even if the driving surfaces are required to have a relatively large diameter.

This object is attained according to the present invention by providing the rotary driving element in the form of a drive wheel in which the connecting web between the hub and outer rim of the wheel is disposed substantially centrally of the width of the rim, and by mounting the holding magnets at both sides of this web. According to one preferred embodiment of the invention, the holding, magnets are provided with pole pieces which are located axially adjacent to the driving surfaces of the drive wheel and are adapted to act directly upon the falsetwisting tubes. A very compact construction may then be attained by providing the holding magnets with at least two pole .pieces which are respectively located above and below the driving surface of the drive pulley and each of which is associated with a separate false-twisting tube, and which are magnetically connected with each other by ring segments or rings. If according to a further improvement of this embodiment of the invention, the pole United States Patent M 3,308,514 Patented Mar. 14, 1967 pieces which are disposed above and below the driving surface and the rings or ring segments which connect them to each other are provided in the form of multipolar magnets which are equally spaced peripherally from each other, it is very easily possible to drive two or more twisting tubes by means of the same driving element and to make the entire unit of a very compact construction.

According to another advantageous modification of the invention, the driving surfaces may be designed so as to extend between the pole pieces and the false-twisting tubes. The lateral parts of the drive wheel which form the driving surfaces are then preferably made of a smaller wall thickness than the central parts. This has the advantage of considerably improving the inherent stability of the driving surface which passes through the gap between the magnet and the false-twisting tubes.

In many cases it will be sufficient if at least one of the pole pieces which act upon the false-twisting tubes may be pivoted coaxially to the driving element. It is, however, also possible to mount the magnets on a housing which surrounds the driving element. The housing may in this case support the bearings of the driving element.

In order to insure that the false-twisting tubes will be held in a position in which they will run true, that is, in a position in which their axes will extend exactly parallel to the axis of the driving element, it is a further feature of the invention to provide suitable means for adjusting or varying the contact pressures which are produced by the magnets. The pole pieces facing the falsetwisting tubes may furthermore be provided with a protective covering in order to protect these tubes from being worn by friction or damaged in any other manner in p the event that, when being inserted into the apparatus,

they are improperly applied against the driving element.

These and other features and advantages of the present invention will become more clearly apparent from the following detailed description thereof which is to be read with reference to the accompanying drawings, in which- FIGURE 1 shows, partly in cross section which is taken along the line I-I of FIGURE 2, a side view of an apparatus according to the invention for false-twisting individual textile threads by means of false-twisting tubes, in which the driving element is provided in the form of a drive wheel, the connecting web of which between the hub and the rim of the wheel is disposed substantially centrally of the width of the rim, and in which the radially adjustable arms of the magnet which act upon and hold the false-twisting tubes in a fixed position relative thereto are mounted above and below the driving element;

FIGURE 2 shows, partly in section, a top view of the apparatus according to FIGURE 1;

FIGURE 3 shows a cross section which is taken along the line IIIIII of FIGURE 4 of an apparatus according to the invention for acting upon and holding the falsetwisting tubes by means of adjustable pole pieces which are connected'to each other by rings;

FIGURE 3a show-s a cross section of a modification of the holding means of the rings;

FIGURE 4 shows a top view of the apparatus according to FIGURE 3 from which the cover is removed;

FIGURE 5 shows a side view, partly in cross section, which is taken along the line IVIV of FIGURE 6, of an apparatus according to the invention which is provided with pole pieces at both sides of the connecting web of I the drive wheel;

FIGURE 6 shows a top view of the apparatus according to FIGURE 5;

FIGURE 7 shows a side view, partly in cross section which is taken along the line V-V of FIGURE 8, of an apparatus according to the invention, in which the pole pieces are mounted at both sides of the connecting web of the driver wheel; while FIGURE 8 shows a top view of the apparatus according to FIGURE 7.

As illustrated in FIGURES l and 2, the apparatus according to the invention for false-twisting individual textile threads compresses comprises a driving element in the form of a wheel 1 which is adapted to be driven by a pulley 4a, and consists of an outer rim 1a, a hub 10, and a web 1b which connects the rim to the hub of the wheel and is disposed substantially centrally of the width of the rim. Rim 1a is provided with

driving surfaces

2 and 2a which are adapted to act upon and drive a pair of falsetwisting tubes 3 at a very high speed. These false-twisting tubes are adapted to be pressed against these

driving surfaces

2 and 2a by the magnetic attraction of the

pole pieces

5 and 5a which are disposed above and below the driving

surface

2 and 2a of the drive wheel .1, respectively, and project from the

arms

5b and 5c of a pair of U- shaped magnets which are secured to a magnet support 6 by screws 7 and setscrews 7a. Thus, a magnetic circuit may be formed between the poles N and S of the pole pieces 5 and another magnetic circuit between the antipoles S and N of the pole pieces 5a so as to exert the highest possible magnetic force upon the false-twisting tubes 3. Each false-twisting tube 3 is provided with a flange 3a which projects into an annular groove 1d in the rim 1a. The strength of the contact pressure between the false-twisting tubes 3 and the

driving surfaces

2 and 2a of the drive wheel 1 may be easily varied by varying the size of the air gap between the

pole pieces

5 and 5a and the false-twisting tubes by a suitable adjustment of the setscrews 7a which may be locked by nuts 7b.

At the left of their center, FIGURES 3 and 4 illustrate a modification of the apparatus according to the invention, in which the magnets 35 which are located above the driving surface 32 of drive wheel 31 are magnetically connected to each other by a ring 35a, while the magnets 35 which are located underneath the driving surface 32a are magnetically connected by a ring 35b. The lower ring 35b is mounted centrally within a bearing housing 39 and adapted to be secured thereto by screws 40. However, since these screws 40 project through elongated slots 39b in the wall of housing 39, as indicated particularly in FIG- URE 4, it is possible to turn the ring 35b slightly about the axis of the drive wheel 31. The upper ring 35a is centrally mounted on and secured to the cover 39a of housing 39. In place of the

rings

35a and 35b it is also possible to employ ring segments or half rings so as to permit the individual magnets 35 to be adjusted independently of each other. At the right of their center, FIGURES 3 and 4 illustrate the

rings

45a and 45b which are located above and below the driving surfaces 32 and 32a, respectively, in the form of annular magnets which are provided with'pole pieces 45 which are adapted to conduct the lines of force of the magnets to the false twisting tubes 33 in a concentrated or focused form. These annular magnets may be secured, centered and adjusted in the same manner as the

rings

35a and 35b at the left side of FIGURES 3 and 4. In place of solid annular magnets, it is also in this case possible to employ magnets in the form of half rings or ring segments. All of these

rings

35a, 35b, 45a and 45b or the corresponding ring segment or half rings may also be held by special magnet holders 36, as illustrated in FIGURE 3a. Such a magnet holder 36 and the outwardly projecting part 49 which is then required are also indicated diagrammatically in dot-and-dash lines at the right side of FIG- URE 4.

FIGURES 5 and 6 illustrate a further modification of the invention in which the drive wheel 51 is provided with a strong web 51b which connects its hub to the outer rim substantially symmetrically to the central plane of the web. The rim of drive wheel 51 is provided with outer driving surfaces 52 and with inner connecting parts 52a which increase in thickness between the thin cylindrical lateral parts 52b and the web 51b. Drive wheel 51 is secured to a shaft 53 which is driven by a pulley 53a. The false-twisting tubes 54 are pressed by the magnetic attraction of the

pole pieces

55 and 55a against the driving surfaces 52 of driving wheel 51. These

pole pieces

55 and 55a are secured to rings 56 and 56a which consist of a magnetizable material. The magnetic circuit of the pole pieces of the magnets which are spaced by air gaps from the false twisting tubes extends through the brackets 57. The upper ring 56 is adapted to be turned slightly about the axis of the drive shaft 53. For this purpose, the upper arms of brackets 57 are provided with slots 57a through which the mounting screws 57b project. Brackets 57 are secured to a supporting plate 58 which consists of Bakelite or aluminum and may carry a cupshaped housing 58a, as indicated in dot-and-dash lines, which is provided with apertures 58b for attending to the false-twisting tubes 54 and with projecting parts 580 for receiving the brackets 57. The supporting plate 58 is held by the bearing housing 59 on the bearing rail 60. The particular shape of the outer rim of the drive wheel clearly indicates that its lateral parts 52b may be made very thin without danger that the inherent stability of the driving surfaces will be aifected, since the distance between the lateral parts 52b from the reinforced central parts 52a and from the very strong connecting web 51b is very small in comparison with the conventional cupshaped driving elements of a uniformly low thickness. It is also possible without reducing the solidity of the rim to divide the driving surfaces 52 at the center by providing a groove 52c as illustrated in FIGURE 5. The particular shape of the drive wheel 51 also permits the magnets to be mounted so as to save considerably in space and render the apparatus very small and compact. The magnets 55 which are disposed opposite to each other at both sides of the drive wheel 51 may then be mounted in a position so as to be very close to the connecting web 51b if the latter is provided with magnetically repellent coatings or if thin, magnetically repellent disks are inserted between the magnets and the connecting web.

FIGURES 7 and 8 illustrate an apparatus according to a further modification of the invention. The driving surfaces 72 are again provided on the outer rim of a drive wheel 71 which is connected by a web 71b to the hub of the wheel which is secured to the shaft 73. This shaft 73 is rotatably mounted in the

bearings

79 and 79a which are secured within the housing 78 on the bottom wall thereof and on its cover 780. The

magnets

75 and 75a carry blocks 75b which are secured thereto, for example, by gluing, and are provided with cylindrical projections 750 which project into corresponding bores in the

annular plates

76 and 76a. The blocks 75b and thus also the

magnets

75 and 75a are secured to the

annular plates

76 and 76a by means of screws 75d which consist of a nonmagnetizable material, for example, brass or of V-4A steel. When screws 75d are loosened,

magnets

75 and 75a may, however, be adjusted to different positions by being turned about the axes of screws 75d so as to permit the direction of the action of the magnetic forces to be varied or shifted. This may even be done while the apparatus is in operation.

The magnetic circuit is closed via the false-twisting tubes 74. The housing 78 is provided with windows 78b 'for the false twisting tubes 74, and by means of flanges, not shown, on its supporting wall 78a the housing 78 is mounted on bearing rails which usually extend longitudinally through the entire machine. The cover 780 is rigidly secured to the housing 78 by screws so that the

bearings

79 and 79a will always be in proper alignment with. each other. While the drive pulley 73a is illustrated in FIGURE 7 as being located underneath the bottom of housing 78, it may, of course, also be located on the upper side of the apparatus.

Although my invention has been illustrated and described with reference to the preferred embodiment thereof, I wish to have it understood that it is in no way limited to the details of such embodiments but is capable of numerous modifications within the scope of the appended claims.

Having thus fully disclosed my invention, what I claim 1. An apparatus for false-twisting individual textile threads comprising at least one false-twisting tube, a drive shaft, means for driving said shaft, a drive wheel mounted on said shaft and having a hub, an outer rim, and a connecting web securing said hub to said rim and being disposed substantially centrally of the width of said rim, the peripheral outer surface of said rim forming a driving surface adapted to engage with and to rotate said tube at a high speed, and at least one magnet for holding said tube in engagement with said driving surface and in a fixed position relative to said magnet merely by magnetic attraction of said magnet and for thus preventing said tube from shifting in tangential directions on said drive wheel.

2. An apparatus for false-twisting textile threads comprising at least one false-twisting tube, a drive shaft, means for driving said shaft, a drive wheel mounted on said shaft and having a hub, an outer rim, and a connecting web securing said hub to said rim and being disposed substantially centrally of the width of said rim, the peripheral outer surface of said rim forming a driving surface adapted to engage with and rotate said tube at a high speed, at least one magnet having a plurality of pole pieces mounted axially adjacent to said driving surface of said drive wheel and being adapted to act directly upon said tube for holding said tube in engagement with said driving surface and in a fixed position relative to said pole pieces merely by the magnetic attraction of said pole pieces and for thus preventing said tube from shifting in tangential directions on said drive wheel.

3. An apparatus for false-twisting individual textile threads comprising a plurality of false-twisting tubes, a drive shaft, means for driving said shaft, a drive wheel mounted on said shaft and having a hub, an outer rim, and a connecting web securing said rim to said hub and being disposed substantially centrally of the width of said rim, the peripheral surface of said rim forming a driving surface adapted to engage with and to rotate said tubes at a high speed, and at least two magnets each having an at least partly annular shape and mounted above and below said driving surface, respectively, and each having a plurality of pole pieces thereon equally spaced peripherally from each other for holding said tubes in engagement with said driving surface and in a fixed position relative to said pole pieces merely by the magnetic attraction of said magnets and pole pieces and for thus preventing said tubes from shifting in tangential directions on said drive wheel, at least one of said pole pieces of each of said magnets being associated wtih one of said tubes.

4. An apparatus as defined in claim 2, in which said pole pieces are spaced by gaps from said tube, said driving surfaces on said rim extending at least into said gaps.

5. An apparatus as defined in claim 4, in which said rim has oppositely disposed outermost wall portions and central wall parts adjacent to said web, and the Wall thickness of said outermost portions of said rim are smaller than the wall thickness of said central parts thereof.

6. An apparatus as defined in claim 5, in which at least one of said pole pieces which are adapted to act upon said tube may be adjusted to different positions by being turned about the axis of said drive wheel.

7. An apparatus as defined in claim 1, further comprising a housing surrounding said drive wheel, said at least one magnet being mounted on said housing at the inside thereof.

8. An apparatus as defined in claim 7, further comprising bearings for said shaft, said bearings also being mounted on said housing.

9. An apparatus as defined in claim 1, further comprising means for adjusting said magnet relative to said tube for varying the forces of attraction of said magnet upon said tube.

10. An apparatus as defined in claim 2, further comprising a protective covering on said pole pieces at least at the parts thereof facing said tube.

References Cited by the Examiner UNITED STATES PATENTS 3,058,289 10/1962 Raschle 57-77.3 3,059,408 10/1962 Hippe et a1. 57-77.45 3,115,743 12/1963 Brodtmann 57-77.45 3,142,953 8/1964 Gassner et al. 5777.45 3,180,074 4/1965 Smith 5777.45 3,232,037 2/1966 Crouzet 5777.45

FOREIGN PATENTS 1,268,325 6/1961 France. 1,362,081 4/1964 France.

FRANK I. COHEN, Primary Examiner. D. E. WATKINS, Assistant Examiner.

Claims

1. AN APPARATUS FOR FALSE-TWISTING INDIVIDUAL TEXTILE THREADS COMPRISING AT LEAST ONE FALSE-TWISTING TUBE, A DRIVE SHAFT, MEANS FOR DRIVING SAID SHAFT, A DRIVE WHEEL MOUNTED ON SAID SHAFT AND HAVING A HUB, AN OUTER RIM, AND A CONNECTING WEB SECURING SAID HUB TO SAID RIM AND BEING DISPOSED SUBSTANTIALLY CENTRALLY OF THE WIDTH OF SAID RIM, THE PERIPHERAL OUTER SURFACE OF SAID RIM FORMING A DRIVING SURFACE ADAPTED TO ENGAGE WITH AND TO ROTATE SAID TUBE AT A HIGH SPEED, AND AT LEAST ONE MAGNET FOR HOLDING SAID TUBE IN ENGAGEMENT WITH SAID DRIVING SURFACE AND IN A FIXED POSITION RELATIVE TO SAID MAGNET MERELY BY MAGNETIC ATTRACTION OF SAID MAGNET AND FOR THUS PREVENTING SAID TUBE FROM SHIFTING IN TANGENTIAL DIRECTIONS ON SAID DRIVE WHEEL.