FR2484472A1 - FALSE FRICTION TORSION DEVICE FOR FALSE TORSION TEXTURING OF SYNTHETIC WIRES AND METHOD OF OPERATING THE SAME - Google Patents

Abstract

FRICTIONAL FALSE TORSION DEVICE FOR FALSE TORSION TEXTURING OF SYNTHETIC WIRES AND ITS OPERATING PROCEDURE. THE PRESENT INVENTION DESCRIBES A FRICTIONAL FALSE TORSION DEVICE INCLUDING TWO ROTATING DISCS 1 AND 2 WHICH PINCH THE WIRE WITH A AREA OF THEIR FRONT SURFACE, ONE DISC BEING MADE WITH A RIGID MATERIAL, THE OTHER BEING WITH A FLEXIBLE MATERIAL, THE FLEXIBLE DISC BEING PRESSED AGAINST THE WIRE BY MEANS OF A TIGHTENING DEVICE 10, THIS FALSE TORSION DEVICE BEING CHARACTERIZED BY THE FACT THAT EACH OF THE TWO DISCS 1 AND 2 IS PERPENDICULAR TO ITS ROTATION AXIS 3, 4 AND SENSITIVELY PARALLEL WITH THE TANGENT TRACKED IN THE MEDIAN OPERATING POSITION 34 AND 35 OF EACH DISC THROUGH THE INTERSECTION POINT OF THE CIRCUMFERENCE OF THE DISC WITH THE RADIUS OF THE DISC PASSING THROUGH THE TIGHTENING POINT 7. APPLICATION FOR TEXTURING WIRES IN FALSE TORSION.

Description

"Friction false twist device for false texturing

  The present invention relates to a frictional false twist device for false twist texturing of

  synthetic yarn and its method of operation.

  By the patent application P 29 28 522.1 there is known a

  positive false-twist friction which is constituted by

  two moving surfaces, which are in close contact with each other

  sibly in the plane of the wire run and pinch between

  they twist the thread falsely. One of the surfaces is

  killed by a rotating flexible disk that can actually be sup-

  wear relatively high tensile forces but no bending force. In order to tighten the wire, on the rear face of this soft disk, there is provided a clamping device which, in the desired zone of tightening of the wire simply applies to the rear face of the flexible disk and causes a bulge of this disk. Therefore, the wire is in contact purely and simply in a narrow and defined area of the two disks. According to the mentioned patent application, the other surface may also be constituted by a flexible disk of this type comprising a clamping device. But it can even happen that the other surface is a

hard disk, that is rigid.

  A particular advantage of this false torturing device

  friction is due to the fact that in addition to the torsion, a force of advancement (or transport) is also exerted on the wire. The object of the present invention is an improvement of a frictional false twist device according to the prior patent application such as torsion / transport ratio.

  can simply be changed without any operational effort

  and without moving the clamping device, but also without changing the stroke of the wire, which is also determined in particular by the distance between the input wire guide and

  the torsion point defined by the tightening of the two discs.

  For this purpose it is proposed the following device:

  Friction false twist device for texturing

  false twist of synthetic yarns, consisting of two

  rotating discs, which grip the thread with a zone of their own

  this front, a disc being made of a tensile material, but flexible and being pressed against the wire by means of a clamping device from its rear face, this device being characterized by the fact that the axes of the

  discs and the clamping device are respectively

  at the base angles and at the apex angle of a triangle

  isosceles whose basic angles are variable. Such a provision

  is still characterized by the fact that both

  discs is movable perpendicular to its rotational axis.

  and substantially parallel to the drawn tangent, in

  the median operating position, by the intersection point

  circumference of the disc with the radius of the disc

  passing through the point of tightening and that the

rabies is mounted stationary.

  The particular advantage of this device lies in the

  that the change in the torsion / transport ratio is sim-

  possible, and that in this case the twisting takes place, independently of the torsion /

  the same circumference of the disc and therefore at a speed

  circumferentially substantially constant disk.

  The embodiment of the invention is characterized by a particularly simple construction and safe operation o each disk is mounted on an oscillating arm, whose axis

  common pivot is located parallel to the axes. dis-

  and substantially coaxially with the

  tightening, and o the direction of rotation of the discs may be

  poured, which gives in particular the advantage that a change of position of the false twist device can be made to go from a twist S to a twist Z and vice versa, so that again no translation of the device of tightening is necessary. The constant maintenance of

  position of the clamping device is therefore particularly

  important because the distance between the input wire guide, placed before the false-twist device and the clamping area, is of particular importance for the quality of the wire and therefore this distance must not be

  even change even for S-Z conversion of torsion.

  The solutions indicated for the inversion of the sense of

  tation are to be achieved in a mechanically simple way. AIN-

  if in one embodiment, the false-twist friction device has a drive pulley having a perpendicular axis of rotation, which relative to the belt

  Tangential moving in the longitudinal direction of. the man

  china, is positionable so that, in order to reverse the direction of rotation of the false-twist friction device,

  the drive pulley is applied against the tandem belt

  in one position from the front and the other

position from the back.

  This false-twist friction device is constituted in particular by a frame intended to receive the clamping device and the oscillating bearing, by a pulley support

  intended to receive the pulley bearing, the bobbin support

  was not connected to the frame in two positions so that, in order to reverse the direction of rotation of the discs, said pulley is applied in one of the positions of the pulley support by the front and in the other position of the pulleys. media of

  pulley from the rear, against the tangential belt

  placing in the longitudinal direction of the machine. This solution

  This has the advantage that for the S-Z conversion of the

  torsion it is not necessary either to modify the cour-

  se of the wire, which makes it possible to obtain with an absolute security

a uniform quality of the wire.

  In the friction false-twist device

  born, the drive pulley is surrounded by the endless belt about 1800, in a horizontal plane; pulleys

  discs are arranged substantially horizontally

  and are surrounded in part for each of the strands of the endless belt; the other closed end of the sansfin belt surrounds a tensioning roller movable by the force of a spring, the spring being suspended at two points of

  different suspension depending on the position of the pulley support.

  There is also described a method for passing a

  false twist torsion device of the tor position

  sion S at the torsion position Z which is characterized by the

  the left disk is tilted, as seen in the

  tightening, to the right, that the right disc is tilted to the left, and that the direction of rotation of the discs

is reversed.

  It has been found that, thanks to a known mechanical means, it is possible to synchronize the adjustment of the two bearings in such a way that by adjusting one bearing, the other takes a

  position always symmetrical with respect to the stroke of the wire.

  The present invention is illustrated by the example of

  criptive and not limiting thereafter with reference to the accompanying drawings, in which: - Figure 1 is a top view of the false friction twist device in which the stroke of the wire is

  perpendicular to the plane that is common to both axes of rock

  tation of the false-twist device; FIG. 3a is a side view of a friction false twist device set in position to obtain the twist S; FIG. 3b is the same side view of a friction false twist device set in position to obtain the twist Z; FIG. 4 is a sectional view of a frictional false twist device, in which the bearings of the disks are

placed on swing arms.

  The false-twist friction device shown in FIGS. 1 and 2 consists of a rigid disk 1 and a flexible disk 2. The two disks are rotatably mounted on the shafts 3 and 4 in the bearings 5 and 6, and are driven by motors, not shown on the

  figure, via belt pulleys 27 and 28.

  The rigid disk has a friction coating 26, which

  may be constituted for example by rubber, "Vulco-

  lan ", a wear-resistant metal, a plasma coating, a ceramic coating, a nickel-diamond coating, etc. The flexible disk consists of a material and possibly a composite material, which on the one hand can absorb the tensile forces due to the centrifugal force, but which on the other hand can be easily bent and present

  a bulge it may be for example a rubber disc

  0.5 to 2 mm thick rubber which has Cord threads inserted into the rubber layer to increase the tensile strength. The clamping device 10 acts on the rear face of the flexible disk 2 having the clamping surface 7, so that this disk has a bulge on the wire 14. Thus, the wire is clamped between the flexible disk 2 and the

  annular friction surface 26 of the rigid disk 1. The dis-

  positive tightening is constituted by a cylinder 9 and a piston 8 moving inside, which on its bearing surface (or clamping) 7 oriented to the flexible disk 2, has a

  cavity 13. There is provided a connection 11 of compressed air, connected

  wherein the piston is compressed in the direction of the floppy disc and, on the other hand, the compressed air is forced into the cavity 13. Thus, pneumatic lubrication is performed between the bearing surface 7 and the flexible disk. ,

  Details can be obtained in the application for

previous vet.

  In FIG. 1, the wire 14 is fed to the friction false twist device by the input wire guide 22 perpendicularly to the plane common to the two axes of the discs 1 and 2. Therefore, the support surface 7 designed oblong develops along the yarn run in a direction perpendicular to the common plane of trees 3 and 4 and so

parallel to the race of the wire.

  According to the present invention, the bearings 5, 6 are posi-

  while the clamping device 10 is

  nary. For this, the bearings 5, 6 have guides with which they can be moved on the slide rods, 16, preferably rectangular, arranged symmetrically with respect to the travel of the wire. The screws 17 and 18 serve to fix the bearings. Thus, the discs can be moved between the inner end positions 29 and the positions

  external extremes 30 shown in Figure 1. The displacement

  bst limited by the stops 31. The positioning is

  kills so that the distance from the wire line is the same each time for both shafts or both axes. The guide rod 15 for the bearing 5 extends in a direction generally perpendicular to the axis of rotation of the shaft 3 and parallel to a line which is tangential to the rigid disk 1 at a point immediately adjacent to the torsion zone. therefore, the zone of the clamping device, when this disc is in the middle operating position 34, in FIG. 1. In this figure, the rod 15 is parallel to the line 36, which is parallel, in turn, to the tangent just defined. Similarly, the guide rod 16 for the bearing 6 is parallel to the line 37, which is parallel to the tangent to the flexible disk 2, at a point immediately adjacent to said torsion zone.

  when this disc is in the operating position

  35. It is therefore ensured that with technical accuracy

  only sufficient, a translation of the bearings between the extreme operating positions 29 and 30 is possible

  without the peripheral speeds of the disks being

  especially modified in the clamping area.

  The translation between the positions 29 and 30 is carried out when for the manufacture of a torsion S the ratio between the torsion and the transport must be modified

  It should be noted for the sake of clarity that between

  extremes 29 and 30 of the disks shown here,

  can choose each intermediate position that favors

  The desired false twist method is used. b The direction of rotation of the disks is represented by the

arrows 23 in Figure 1.

  Figures 3a and 3b show the side view of a

  positive false twist shown in section in the figure

  4, according to the position of the friction discs 1 and 2 se-

  In FIGS. 3a and 4, a torsion S is produced and according to the position of the friction discs 1 and 2 according to FIG. 3b, a twist Z is produced. The false-twist friction device shown in the figures is constituted by the frame 38 which has a U-shaped cross section, as shown in FIG. 4. In one of the branches of the U of this frame 38 is placed the device tightening 10

  constituted by a cylinder 9 and a piston 8.

  The oscillating arms 40 and 41 are pivotally mounted

  xialement to the central axis 39 of the clamping device 10, in the branches of the frame 38 and are fixable by means of the nuts 42 and 43. At the ends of the swing arms are the bearings 5 and 6 for the discs 1 and 2. L The drive of the false twist device is performed by the tangential belt 45 which extends along the machine and rotates at a constant speed and in the same direction. The tangential belt 45 s' supports

  against the main pulley 44 of the false torment device

  friction member, which is rotatably mounted on the pulley support 46 and carries at the end of its shaft the main belt pulley 47. This pulley is surrounded in an arc up to about 1800 by the endless belt 48 which then surrounds about 1800 the belt pulley of the friction disc 2 with its strand 49 and the pulley 52 of the friction disc 1 with its strand 51 and then

  returns to the crazy tension roller 53, to surround it

  with its other end closed about 1800. The bearing 54 is movable in the tension direction 56 and is

  pressed in the direction of tension by the spring of pres-

  55. This pressure spring is fixed to the frame by

the bolt 57.

  The pulley support 46 can be mounted on a guide plate 25 of the frame 38 in two positions 60 and 61 by means of a connecting piece 58. This pulley support 46 is connected to the connecting piece 58 by a spring This spring is constituted by two parallel spring blades 63 which are firmly connected to each other at their ends, so that by deflecting

  the spring blades 63, their ends can simply

  perform a parallel motion. The lever 64 is

  pivotable in the frame 38 at the pivot point 65. It slides with the bolt 66 on a slideway 67 provided with a notch 68. In the position shown in Figure 3a, the pulley 44 is pressed against the tangential belt by the When the bolt 66 engages in the notch 68, the pulley 44 is

  separated from the tangential belt 45.

  For the mounting position 61 shown in the figure

  3b of the connecting piece 58, the pulley support 46 pos-

  sede another slide 69 having a notch 70. For

  separate the pulley 44 from the tangential belt 45, that is,

  that is to say to stop the operation of the device of false friction twist, the bolt 66 is inserted in the eye of the lever 64, acting simultaneously with the slideway 69,

  and is engaged in the notch 70. To maintain the tension

  By moving the pulley support from position 60 to position 61 or vice versa, even the point of suspension of the pressure spring 55 can be adjusted because the bolt 57 is removed from the eye 71. found in the frame 38 and is sunk into the eye 72

Or vice versa.

  It is preferable that the pressure spring 55 has a very flat operating curve, so that the force it exerts is independent of the elongation of the

  spring within the limits provided by the operation.

  The friction false twist device shown in FIGS. 3 and 4 operates in the following manner - the thread acquires in the position according to FIG. 3a a twist S. Thus the torsion point, that is the point

  determined by the clamping device where the thread is now

  in frictional contact between the discs, can be

  stationary, although this point may be

  moved relative to the discs by changing the posi-

  angle of the swing arms 40 and 41 relative to each other

  to the other. It should be mentioned that on the built 38 are pre-

  for this purpose steel angles which are not

  shown on the drawings. In order to convert S twist

  in torsion Z, the change of position visible in FIG.

  re 3b is performed in such a way that the disc 2 is now on the right and the disc 1 on the left, the stroke of the thread. Simultaneously, the pulley 44 is brought from the position

  shown in FIG. 3a, to the left of the tangential belt

  45 in the position shown in FIG. 3b, right

  this belt, without changing the direction of travel of the tangential belt. For this movement of the pulley, a displacement of the connecting piece 58 from position 60 to position 61 is effected. In order to further stop the operation of the false twist device by separating the pulley from the tangential belt, the bolt 66 is removed from one of the eyes and is inserted into the eye which cooperates with the slide 67 and the notch 68. or

  well with slide 69 and notch 70. -

  With the movement of the pulley, the direction of travel of the endless belt 48 is reversed from the direction 73 to the direction 74 in FIG. 3b, so that the direction

  rotation of disks 1 and 2 also changes. For

  hold the tension of the belt, the bolt-57 of the pressure spring 55 is simultaneously removed from the eye 71 and

inserted into the eye 72.

  Then a Z twist can be realized.

Claims (8)

  1.- False twist friction device for the textile   False twist tinting of synthetic yarns, comprising two rotating discs, which clamp the yarn with a zone of their front face, a disc made of a material   resistant to traction, but flexible and being pressed   being the wire by means of a clamping device from its rear face, this device being characterized in that the axes (3,4) of the discs (1,2) and the clamping device (10) are arranged respectively at the base angles and at the apex angle of an isosceles triangle whose angles basic are variable.   2.- False twist friction device according to the re-   1, characterized in that each of the two disks (1, 2) is displaceable perpendicularly to its axis of rotation (shafts 3, 4) and substantially parallel to the traced tangent, in the median operating position (34, 35). , by the intersection point of the circumference of the   disc with the radius of the disc passing through the point of ser-   rage 7, and that the clamping device 10 is stationary mounted nary. at   3.- False twist friction device according to the re-   2, characterized by the fact that each of the disks   is mounted on an oscillating arm (40,41) whose axis (39) is   pivoting is parallel to the axes of the discs and   coaxially with the clamping device (10).   4.- False twist friction device according to the re-   3, characterized by the fact that the sense of rota-   Discs 1 and 2 are invertible.   5.- friction false twist device according to claim 4, characterized in that the device   false-twist friction has a driving pulley   (44) having a perpendicular axis of rotation, which relative to the tangential belt (45) moving in the longitudinal direction of the machine, is positionable such that, in order to reverse the direction of rotation of the machine,   false-twist friction device, the drive pulley -   is applied against the tangential belt in 22484472 one of the positions from the front and in the other position rear.   6.- False twist friction device according to the re-   vendication 5, characterized in that this device is constituted by a frame (38) intended to receive the clamping device and the oscillating bearing, by a pulley support (46) intended to receive the bearing of the pulley, the support of coil being connected to the frame in two positions (60, 61) so that, in order to reverse the direction of rotation of the discs (1, 2), the pulley (44) is applied in one of the positions of the pulley support from the front and in the other   position of the pulley support from the rear, against the   tangential belt (45) moving in the longitudinal direction the machine.   7.- False twist friction device according to the   Claim 6, characterized in that the pulley of   the train is surrounded by the endless belt (48) on about 1800 in a horizontal plane; than the pulleys (50,   52) are arranged substantially horizontally   zontale and are surrounded in part by each strand   (49, 51) of the endless belt; that the other end   end of the endless belt surrounds a tensioning roller (53) displaceable by the force of a spring, the spring 55 being suspended at two different suspension points (71, 72)   following the position of the pulley support.   8. A method for passing a friction false twist device according to claim 4 from the torsional position S to the torsion position Z and vice versa, characterized in that the left disc, seen in the direction of tightening, is swung to the right and the right disk is tilted to the left; and that the meaning of dike rotation is reversed.