JPS6350449B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Friction false twisters are known which consist of two movable surfaces, which surfaces are in contact approximately in the yarn running plane and which clamp the yarn to be false twisted between them. ing. One surface is designed as a rotating, flexible disk, which has relatively high tensile forces but cannot accept bending forces. For the purpose of tightening the thread, a crimping device is provided on the back side of such a flexible disk, which crimping device can only abut the back side of the flexible disk within the desired range of spring tightening. This causes a bulge in the soft disc. The threads therefore only come into contact in a narrowly defined area of both discs. Furthermore, in the known friction false twister described above, the other surface is also designed as a flexible disk as described above with a crimping device. However, it is likewise possible for the other surface to be designed as a rigid or bendingly rigid disk.

The advantage of such a friction false twister is that, in addition to twisting, it also exerts a feeding action on the yarn.

The object of the present invention is to provide a method which requires no special operating outlay and without adjustment of the crimping device, and in particular by allowing the spacing between the inlet thread guide and the twisting point to be defined by the clamping of the two discs. It is an object of the present invention to improve the known friction false twisting machine in such a way that the ratio of twist and yarn feed can be changed simply, without any defined changes in the yarn run.

In order to solve such problems, the present invention
Each of the two discs is movable and positioned perpendicular to the axis and substantially parallel to the tangent line located in the crimping area in the central working position of the respective disc. .

The advantage of such a configuration is that the ratio between the twisting degree and the yarn feeding speed can be easily changed, and in this case, the twisting degree remains approximately in the same circle regardless of the ratio between the twisting degree and the yarn feeding speed. This is done at the outer circumference of the plate and therefore at a substantially constant circumferential speed of the disk.

Furthermore, in a preferred embodiment of the invention, each of the disks is supported on a rocker whose common pivot axis is parallel to the disk axis and substantially concentric with respect to the crimping device. It is located in This results in a simple and operationally reliable construction. Furthermore, the direction of rotation of the disc can be switched. This results in a changeover from the S twist to the Z twist and from the Z twist to the S twist, in which case no movement of the crimping device is necessary.
The distance between the inlet yarn guide located in front of the friction false twister and the crimping area is of great importance for the yarn quality and therefore must not be changed when switching between S and Z twists. Therefore, it is important to keep the space of the crimping device constant.

Furthermore, according to the embodiments set forth in claims 4 to 6, switching of the rotational direction can be performed mechanically and easily. In this case, it is advantageous to consist of a main frame for receiving the crimping device and the rocker and a whirl frame for receiving the whirl, the whirl frame being able to rotate the disk in two positions. For direction change, the whirl is connected to the main frame in such a way that it rests on a belt circulating in the machine longitudinal direction from the front in one position of the whirl frame and from the rear in the other position of the whirl frame. As a result, there is no need to change yarn running when switching between S twist and Z twist, and this provides the advantage that uniform yarn quality is guaranteed.

Furthermore, by known mechanical means it is also possible to synchronize the adjustment of both bearings in such a way that the adjustment of one bearing always assumes another position symmetrical to the thread running. be.

The invention will be explained below with reference to the exemplary embodiments shown.

The friction false twisting machine shown in FIGS. 1 and 2 consists of a highly rigid disk 1 and a soft disk 2. Both discs are mounted in bearings 5, on shafts 3, 4.
6 and is driven via belt wheels 27, 28 by a drive (not shown). The disk 1 with high rigidity is
For example, the friction lining 26 may be comprised of rubber, vulcanizate, wear-resistant metal, plasma coating, ceramic coating, nickel diamond coating, and the like.

The flexible disk 2 on one side accepts the tensile forces generated by the centrifugal force, but on the other side consists of a material that can be easily bent and raised, possibly a synthetic material. Disk 2 is, for example, 0.5~
It is designed as a 2 mm rubber disk, which has a cordier yarn insert embedded in the rubber coating to increase the tensile strength.

The flexible disk 2 is loaded on the rear side by the crimping surface 7 via the crimping device 10 and is thereby raised towards the thread 14 . As a result, the thread is clamped between the soft disc 2 and the ring-shaped friction lining 26 of the rigid disc 1. The crimping device consists of a cylinder 9 and a piston 8 movable within the cylinder, which piston has a notch 13 in the crimping surface 7 facing the soft disk 2.
have. The crimping device is provided with a compressed air connection 11 by means of which the piston 8 is crimped on one side in the direction towards the flexible disk and on the other side compressed air is passed through the air channel 12. Compressed into the notch. Compressed air lubrication therefore takes place between the crimping surface 7 and the flexible disc.

In FIG. 1, the yarn 14 is fed through an inlet yarn guide 22 to a friction false twister perpendicular to a plane common to the axes of the disks 1, 2. A correspondingly elongated crimping surface 7 is oriented along the thread running direction at right angles to the common plane of the shafts 3, 4 and thus parallel to the thread running direction.

According to the invention, the bearings 5, 6 are adjustable;
In contrast, crimping devices are stationary. Furthermore, the bearings 5, 6 have guides by which they can be moved along e.g. rectangular guide rods 15, 16 arranged symmetrically with respect to the yarn running direction. be. Screws 17, 18 are used to secure the bearing. This allows the screws 17, 18 to be moved to the inner end position 2 shown in FIG.
9 and an outer end position 30. The travel distance is limited by a stopper 31. The positioning takes place in such a way that the distance of the threads relative to both axes or axes is the same in each case.

The guide rod 15 for the bearing 5 and the guide rod 16 for the bearing 6 are arranged such that the rigid disc 1 or the flexible disc 2 is located in the central operating position 34 or It is oriented parallel to the tangents 36, 37 having at 35. This allows the end working position 2
A technically sufficient precision of between 9 and 30 allows movement of the bearing without the circumferential speed of the disc being significantly changed in the crimping range.

The movement between the end positions 29 and 30 is carried out when changing the ratio of the twist degree to the yarn feed rate in order to produce an S-twist.

For the sake of clarity, an intermediate position has been chosen between the end positions 29, 30 of the illustrated disks, which are advantageous for the desired false-twisting process.

The direction of rotation of the disc is indicated by arrow 23 in FIG.

3a and 3b show a side view of the false twisting machine shown in cross-section in FIG. , a Z twist is produced in the position of the discs 1, 2 according to FIG. 3b. The false twister shown here consists of a main frame 38 with a U-shaped cross section, as can be seen in FIG. A crimping device 10 consisting of a cylinder 9 and a piston 8 is supported on the side surface of the U-shaped main frame 38 . A rocking body 4 is mounted on the U-shaped side surface of the main frame 38 concentrically with respect to the central axis 39 of the crimping device 10.
0 and 41 are rotatably and fixedly supported by nuts 42 and 43. Bearings 5, 6 for the disks 1, 2 are provided at the ends of the rocker.

The operation of the false twisting machine is carried out by means of a belt 45 extending tangentially.
The belt extends in the longitudinal direction of the machine and circulates at a constant speed and in the same direction of operation. A main whirl 44 of the false twisting machine is attached to the belt 45, and the main whirl is rotatably supported on a whirl frame 46 and has a main belt wheel 47 at the axial end of the main whirl. . The main belt wheel 47 is wrapped approximately 180 degrees by an endless belt 48, so that the endless belt 48 is wrapped around the belt wheel 50 of the disk 2 with one belt section 49 and with the other belt section 51. The endless belt 4 is wrapped around the belt wheel 52 of the disc 1 to approximately 180 degrees, and then the endless belt 4
The closed end of 8 is wrapped approximately 180 degrees around the main belt wheel 47, and the belt 48 is then returned to the freely rotatable tension roller 53. This tension roller is approximately at the other closed end of the belt.
It is wrapped by a belt up to 180 degrees. The bearing 54 is movable in the direction of the arrow 56 indicating the crimping direction and is compressed by a compression spring 55 in the compression direction. The push spring is supported by pins 57 on the main frame.

The whirl frame 46 is connected to the guide plane 59 of the main frame 38 at two points 6 by means of a connecting member 58.
It is incorporated in 0.61. A whirl frame 46 is connected to a connecting member 58 by a parallelogram spring 62. The parallelogram spring 62 is
It consists of two parallel spring plates 63 which are fixedly connected to each other at their ends, so that when deflecting the spring plates 63, only parallel movements of the ends of the spring plates take place. The lever 64 is the main frame 38
is pivotably supported at a pivot point 65. The lever 64 is slid by a pin 66 along a sliding piece 67 having a locking portion 68 . In the position shown in FIG. 3a, the whirl 44 is pressed against the tangentially extending belt 45 by the force of the parallelogram spring 62. When the pin 66 is engaged with the engagement portion 68, the whirl 44 is lifted from the belt 45.

Due to the position 61 of the connecting element 58 shown in FIG. 3b, the whirl frame has a further sliding piece 69 with a catch 70. In order to lift the whirl 44 from the belt 45, i.e. to put the false twisting machine out of operation, a pin 66 extends into an eye cooperating with a slide 69 on the lever 64 and into a stop 70. to be locked. In order to keep the belt tension constant, the suspension point of the push spring 55 is also connected to the pin 57 when switching the whirl frame from position 60 to position 61 or vice versa.
is adjusted by being pulled out from an eye 71 provided in the main frame 38 and inserted into an eye 72, or vice versa.

It is clear that the pressure spring 55 has a very flat characteristic curve, so that the force exerted by the pressure spring is independent of the spring travel within the limits predetermined by operation.

The function of the false twister shown in FIGS. 3a, 3b and 4 is as follows: The yarn maintains an S twist in the position according to FIG. 3a. This ensures that the twisting point, i.e. the point defined by the crimping device and which holds the yarn in frictional contact between the disks, is held fixedly but nevertheless relative to the disks. To,
The adjustment is made by mutually changing the angular positions of the rocking bodies 40 and 41. For this purpose, a corner bracket (not shown) is provided on the main frame 38. The change in position as seen in Figure 3b for switching from S to Z twist is due to the change in position of disk 2.
is now carried out on the right side of the yarn path, and the disc 1 is located on the left side of the yarn path. At the same time, a whirl 44 is brought to the left of the belt 45 tangentially in the position shown in FIG. 3a and to the right of the belt 45 in the position shown in FIG. 3b. In this case, the running direction of the tangential belt is not changed. To switch the whirl, the connecting member 58 is in position 6.
0 to position 61. Furthermore, in order to stop the false twisting machine by lifting the whirl from the belt 45, the pin 66 in the lever 64 is moved from one eye to the sliding piece 67 and the stop 6.
8 or into an eye cooperating with the sliding piece 69 and the locking part 70.

By switching the whirl, the running direction of the endless belt 48 is switched from the direction of the arrow 73 to the direction of the arrow 74 shown in FIG. 3b, and therefore the direction of rotation of the discs 1, 2 is changed. At the same time, pin 5 of push spring 55 is pressed to generate belt tension.
7 is moved from eye 71 into eye 72.

Now a Z twist is produced.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a friction false twisting machine having a yarn running path perpendicular to a plane common to the rotation axes of both discs of the friction false twisting machine; Fig. 2 is a partial vertical sectional view of the crimping device; Figure 3a is a side view of the friction false twisting machine that produces S twist, Figure 3b is a side view of the friction false twister that produces Z twist, and Figure 4 is a side view of the friction false twister that produces S twist. FIG. 2 is a cross-sectional view of a friction false twister. 1, 2... Disc, 3, 4... Shaft, 5, 6... Bearing, 7... Crimping surface, 8... Piston, 9... Cylinder, 10... Crimping device, 11... Compressed air connection Part, 12... Air passage, 13... Notch part, 1
4... Thread, 15, 16... Guide rod, 17, 18...
... Screw, 22 ... Entrance thread guide section, 23 ... Rotation direction, 26 ... Friction lining, 27, 28 ... Belt wheel, 29, 30 ... End position, 31,
32...stopper, 33...yarn running direction, 34,
35... Operating position, 36, 37... Tangent line, 38...
...Main frame, 39...Central axis line, 40, 41...
... Rocking body, 42, 43 ... Nut, 44 ... Main whirl, 45 ... Belt extending in the tangential direction, 46
... Whirl frame, 46 ... Main belt wheel, 47 ... Main belt wheel, 48 ... Endless belt, 49 ... Belt division, 50 ... Belt wheel, 51 ... Belt division, 52 ... Belt wheel, 53 ... tension roller, 54 ... bearing, 55 ... push spring, 56 ... pressure bonding direction, 5
7... Pin, 58... Connection member, 59... Guide plane, 60, 61... Location, 62... Parallelogram spring, 63... Spring plate, 64... Lever, 65...
Turning point, 66... Pin, 67... Sliding piece, 68...
...Locking part, 69...Sliding piece, 70...Locking part, 7
1, 72... Eye, 73, 74... Belt running direction.

Claims (1)

[Scope of Claims] 1. Friction false twisting machine for false twisting synthetic fiber yarns, comprising two rotating discs tightening the yarn in the end area, in this case one circular In a type in which the plate is made of a tensile-resistant yet elastic material and is crimped from the back side of the disk toward the yarn by a crimping device, both the disks 1 and 2 are tangents 3, each perpendicular to the axes 3, 4 and located in the crimping area in the central working position on the respective disk;
A friction false twisting machine for false twisting synthetic fiber yarns, characterized in that it is movable substantially parallel to 6, 37, and that the crimping device 10 is fixedly disposed. 2. Each of the discs is supported by rocking bodies 40 and 41, and the common pivot axis 39 of the rocking bodies is located parallel to the disc axis and approximately concentrically with respect to the crimping device 10. A friction false twisting machine according to claim 1. 3. The friction false twisting machine according to claim 2, wherein the rotation direction of the discs 1 and 2 is switchable. 4 has a drive whirl 44 with a vertical axis of rotation, which whirl can be moved to one side in order to switch the direction of rotation of the false twister in relation to a tangential belt 45 circulating in the longitudinal direction of the machine; The friction false twisting machine according to claim 3, wherein the friction false twisting machine is positioned so as to come into contact with the belt 45 from the front at one position and from the rear at the other position. 5. It consists of a main frame 38 for receiving the crimping device and the rocking body, and a whirl frame 46 for receiving the whirl, and in this case, the two whirl frames are at positions 60 and 61, and the disk 1, 2, the whirl 44 is connected to the main frame so as to abut a belt 45 circulating in the longitudinal direction of the machine from the front at one position of the whirl frame and from the rear at the other position of the whirl frame. A friction false twisting machine according to claim 4. 6. The driving whirl is wrapped approximately 180 degrees by the endless belt 48 in a horizontal plane,
belt discs 50, 52 are arranged substantially horizontally and are partially wrapped around each belt section 49, 51 of the endless belt;
The other closed end of the endless belt wraps around a tensioning roller 53 which is moved under spring force, in which case a pressure spring 55 causes two different eyes 71, 7 to move in relation to the position of the whirl frame.
6. The friction false twisting machine according to claim 5, wherein the friction false twisting machine is adapted to be suspended between two.