EP1149938A2 - Procedure and arrangement for piecing two yarn ends from which a twisted yarn is produced in an integrated Openend-spinning and "two for one" twisting process - Google Patents

Abstract

A method for spinning the free ends of two strands of a thread formed from these strands in the context of an integrated OE spinning and double-wire twisting process, in which two OE spinning rotors are integrated in a double-wire twisting spindle, is characterized in that the two free ends of a filament thread threaded through the hollow spindle axis of the double-wire twisting spindle are gripped and held in an area with the twist thread still essentially intact, and the twisted thread is pulled out of the hollow spindle axis, whereupon the twist of the twisted thread is turned back over a sufficient thread length so that it is turned back the spinning twist originally present in the as yet untwisted spun threads runs back into the individual threads, which are then introduced as piecing threads into the OE spinning rotors, the double-wire twisting process being started up again at the same time. <IMAGE>

Description

The invention relates to a method according to the preamble of patent claim 1 and a device according to the preamble of claim 4.

EP 0 701 014 B1 (= DE 44 31 830 C1, US Pat. No. 5,626,011) describes a method and a device for producing a thread in an integrated open-end spinning and double wire twisting process. The device has part a double-wire twisting spindle rotatably mounted in a machine frame drivable spindle rotor with a spindle hollow axis, to which an essentially connects radially outward thread guide channel for a thread that after exiting the thread guide channel with balloon formation to one in the extension of the spindle hollow axis lying center point and then subtracted and is wound into a coil. Within the one defined by the thread balloon Above the spindle rotor there are two rotor spinning units next to each other and symmetrical to the hollow spindle axis with open OE spinning rotors arranged to which the fiber material is fed through the thread balloon. The spun threads produced by these OE spinning rotors are pulled upwards and redirected in their direction of movement by 180 ° and inserted into the hollow spindle axis, to be twisted according to the double wire twisting principle.

For the production of the spun threads it is necessary that in the OE spinning rotors spinning strands or piecing threads are introduced. A corresponding procedure and a corresponding device are the subject of EP 0 701 014 B1 and form the basis for the preambles of claims 1 and 4 of the present application.

When piecing in an integrated OE spinning and double wire twisting process according to the teaching of EP 0 701 014 B1, disadvantages can occur such that that the thread produced immediately after a piecing process over a greater length does not have twisted thread sections, so that under Under certain circumstances, the entire bobbin becomes unusable for further processing. This applies both to the removal of a broken thread and to the initial winding a thread spool.

The invention has for its object to a method and a device create, with which it is ensured that the immediately following the threading process produced no or only very short sections with individual threads not twisted together.

This task is solved procedurally with the features from characterizing part of claim 1, wherein advantageous developments in claims 2 and 3 are described.

A device for performing the method according to the invention is the subject of claim 4. Advantageous further developments of this device are in the Sub-claims 5 to 13 described.

When using the method according to the invention is by pinching the single filament according to step (1) ensures that during the step (k) Maintain spinning twist returned to the individual filament remains, with a curling of the spinning thread in the area of the thread loop is prevented.

The spinning twist can therefore only take place in a relatively short section of the end of the spinning thread be turned up or back, namely in the section between the Clamping point and the free thread end inserted into the spinning rotor. This Incidentally, the thread end is only inserted so far into the spinning rotor that it is in front of the Beginning of the fiber material feed into the spinning rotor at a distance from the fiber material collecting channel of the spinning rotor, with the free thread end still in the Spinnrotorhohlachse or the Spinnrotorabzugrohr is such that it at rotating spinning rotor is not exposed to centrifugal force.

If sufficient fiber material is fed into the rotating spinning rotor has been, the piecing process, as in claim 1 in features (d) to (g) is initiated. Pull off the second loop branch according to Characteristic (f) is brought about by the fact that the usual, precisely timed Winding unit of the double wire twisting spindle is started.

At the beginning of the piecing process, the one generated by the OE spinning rotor runs Spin spinning into the previously free, not pinched end of the piecing thread, see above that immediately after the piecing two spun threads are present, the have the spinning twist required for the double wire twisting process.

The feeding of the free piecing thread ends into the individual spinning rotor or into whose fiber material collecting channel can additionally according to claim 3 are favored that the thread loop, d. H. both thread loop branches between the pinch point existing according to feature (k) and the entry into the spinning rotor is inserted into a delivery plant consisting of a pair of rollers, such that the first loop branch to the spinning rotor and the second loop branch to the spindle hollow axis is led.

If during the piecing process after starting the double wire twisting spindle assigned winding unit begins the twisting process and thus the the two threads are drawn into the hollow spindle axis, the rollers each delivery unit inevitably set in rotation, whereby the conveying of the to Spinning rotor leading thread section takes place.

The following description of the figures serves to carry out the method according to the invention Described device according to claim 4, wherein advantageous Further developments of this device are treated in claims 5 to 13.

Figur 1

zeigt eine Schnittdarstellung einer Doppeldraht-Zwirnspindel mit darin integrierten Spinnaggregaten in Form von OE-Spinnrotoren;

Figur 2

zeigt in vergrößerter perspektivischer Darstellung die erfindungsgemäße Anspinneinrichtung;

Figur 3

zeigt in nochmals vergrößerter Darstellung ein erstes Detail der Anspinneinrichtung;

Figur 4

zeigt ebenfalls in vergrößerter Darstellung ein zweites Detail der Anspinnein richtung

The invention is described below with reference to the drawing.

Figure 1

shows a sectional view of a double-wire twisting spindle with integrated spinning units in the form of OE spinning rotors;

Figure 2

shows the piecing device according to the invention in an enlarged perspective view;

Figure 3

shows in a further enlarged view a first detail of the piecing device;

Figure 4

also shows an enlarged view of a second detail of the Anspinnein direction

1 is in a machine frame represented by a spindle bench 1 by means of a bearing block 2, a hollow shaft 3 rotatably mounted, the outer, d. H. lower end can be connected to a suction air source, not shown. The one Vortex 4 can be driven by means of a hollow shaft, not shown, by a tangential drive belt 3 carries a radially outwardly directed spindle rotor disc 5 with an im essentially radially guided thread guide channel 6. On the outer circumference of the spindle rotor disc 5, a balloon limiter pot 7 is fastened, in the wall of which a thread guide channel 8 is guided vertically upwards, with its lower end to the thread guide channel 6 connects and from its upper end the thread F3 is guided to the centering eye 9.

In the inner end of the thread guide channel 6 opens out as part of the spindle hollow axis its lower end bent thread guide tube 10, so in the hollow shaft 3rd is used that 10 air channels between the hollow shaft and the thread guide tube 11 remain free. The spindle rotor consists essentially of the following Elements: hollow shaft 3, spindle rotor disc 5, balloon limiter pot 7 with thread guide channel 8 and thread guide tube 10.

On the upper end of the hollow shaft 3 is an essentially by means of suitable bearings closed inner housing 12 mounted, for example by means of not shown Permanent magnet is secured against rotation and a bottom 12.1, one Has cylinder housing 12.2 and a cover 12.3. In the inner housing 12 are two rotor spinning devices or OE spinning units R1 and R2 housed, whose spinning rotors 13, 14 are open at the top and by means of a drive belt 15 are driven by a motor, not shown. The energy supply this drive motor takes place through the spindle rotor disk 5 through a schematic indicated system of slip ring contacts 16, 17 with adjoining them electrical cables.

The spindle rotor is surrounded by an outer housing 18, consisting of a bottom 18.1, a lower cylinder housing section 18.2, an upper cylinder housing section 18.3 and a removable cover 18.4, which has the centering eye 9.

In the spinning rotor 14 opens a fiber material feed channel that an inner through the cover 12.3 channel section 19.1 and one through the has upper channel housing section 18.3 guided channel section 19.2. The Spinning rotor 13 has the same fiber material feed system, not shown in detail on.

In connection with the spinning rotor 13 is representative of both spinning rotors Thread take-off tube 20 shown. Through the thread take-off tubes 20 in the Spinning rotors 13, 14 produced spun threads F1 and F2 are drawn off and over pulleys 26, 27 passed before going down through the top inlet end directional spindle hollow axis 21 enter, with the interposition of an annular gap seal 22 opens into the upper end of the thread guide tube 10.

At the inner end of the hollow shaft 3 connect air channels 23, 24, which in Area of the spinning rotors 13, 14 open into the interior of the inner housing 12. In this way, by applying suction to the hollow shaft 3 Vacuum fiber material through the fiber material feed channels 19 into the spinning rotors 13, 14 are fed.

The piecing device 30 described below with reference to FIGS. 2 to 4 is housed in a recess 12.3 'on the top of the cover 12.3.

According to FIG. 2, this piecing device 30 consists of an essentially rotationally symmetrical one Base body 31, the bottom 32 with a central, coaxial to Spindle hollow axis 21 lying opening 33 and with side openings 34, 35, the each connect to the spinning thread draw-off tubes 20 of the spinning rotors 13, 14.

On the bottom 32 of the base body 31, a support plate 55 is mounted on the next the pulleys 26, 27 already discussed above, two delivery plants and as Thread storage elements two clamping devices as essential parts of the invention Piecing device 30 are mounted or attached.

The clamping device consists of an essentially ridge-like block 56, whose two inclined surfaces form clamping surfaces 36 and 37, respectively. Every clamping surface is a movably mounted clamping plate 38 and 39 assigned, the magnetic Material. Each clamping plate 38 and 39 is floating and is provided a rearward-facing approach 38.1 and 39.1, respectively Distance from each other ends of the approaches at the transition points to the actual clamping plate 38 incisions 38.2 and 39.2 are attached. To the Block 56 is a plate 41 fastened with a screw 42. The plate 41 has accordingly the "ridge surface" of the ridge-like block 56 has the shape of an isosceles Triangle, the legs of which are parallel to the inclined clamping surfaces 36 or 37. These legs of the triangular plate 42 close obliquely to the block 56 facing wings 43 and 44, both as it is for the wing 44 is shown, have elongated, essentially rectangular cutouts 44.1, into which the individual clamping plate 38, 38.1 or 39, 39.1 by means of the incisions 38.2 and 39.2 are attached.

4, a permanent magnet 40 is inserted in such a way that the single clamping plate 38 under the influence of magnetic force either in the clamping position pulled against the stationary clamping surface or by interaction between their rear attachment 38.1 or 39.1 and the permanent magnet 40 in the open position is held. The individual clamping plate 38 or 39 is thus between Clamping and opening positions can be swiveled.

Each of the two delivery plants has two rollers 51, 52 and 53, 54, each of which one roll can be swung away from the other roll, as it is for the Roll 52 is illustrated with the aid of the roll 52 'shown in dashed lines. The two Rolls 51, 52 and 53, 54 of each delivery unit are arranged so that each roll gap directly to the lower end of the two cooperating clamping surfaces each Storage element connects.

The pivotably mounted roller 52 or 54 of each delivery mechanism is preferred spring-loaded, so that this pivotable roller can be adjusted resiliently against its counter roller is.

According to Figure 3, the roller 51 is designed as a hollow body, with its inner wall on a spherical support body 46 fastened on an axis 45, preferably in Spherical shape, is supported. Bearing against the outer peripheral surface of the roller 51 the opposite ends of the roller 51 stop body 47, 48 parallel to the plane defined by the axes of the two rollers 51, 52 on the one hand and perpendicular are aligned with the roller gap of the supplying plant. This ensures that the roller 51 change its position only about a vertical axis in one plane can, which is determined by the axes of the two roles, while by the pivoting against the top of the roller 51 abutment body 47, 48 or tilting of the roller 51 prevented about a horizontal axis in one plane becomes tangent to the lateral surfaces touching in the area of the roller gap of the two rollers 51, 52 is placed.

The meaning and purpose of the interacting clamping surfaces on the one hand formed storage elements and the formed by the roles assigned to each other Supplying plants result from the following description of a piecing process.

In the event of a thread break or in the case of an initial or first winding one When the cover 18.4 of the outer housing is removed, the take-up spool becomes a thread from above through the centering eyelet 9 of this cover 18.4 and then through the thread guide channel 8, the radial thread guide channel 6, the thread guide tube 10 and the spindle hollow axis 21 are threaded through. The one out the upper end of the thread guide tube 21 emerging thread is at one Gripped point where preferably a completely intact twist of the thread is available. Then the twist is turned back over a certain length of thread, whereby the originally present in the not yet twisted filaments Spin turns back into the individual threads. Then the parallel horizontal filaments separated from each other for the further process Cut the required length and "fix" the free ends of the spun thread. The In this context, the term “fixation” of the ends of the spinning threads is to be understood as that it must be ensured that the run back in the individual spinning thread Maintain spinning twist over the full length of each of the two separated filaments remains. Each individual "fixed" spider thread is then in the form of a loop FS with two parallel thread branches on the stationary clamping surface 36 or 37 stored and by means of the movable clamping plate 38 or 39 in clamped in this loop-shaped form. Because of the floating Storage of the movable clamping plate 38 and 39 is under the influence of the permanent magnet 40 ensures that even with differences in thickness of the loop pinched thread section an optimal, even clamping of both Loop branches are present.

When the thread loop is placed on the stationary clamping surface, the two loop branches simultaneously between the interacting rollers 51, 52 or 53, 54 each delivery plant interposed, whereby to facilitate this insertion the loop ends between the delivery rolls each one swiveling The delivery roller has been swung away from the other.

As a result of the floating bearing of the one roller 51 or 54 of each delivery unit ensures that regardless of differences in thickness of the filament always both Loop branches securely clamped between the interacting delivery unit rollers are.

The free end of the spun thread is allocated through the thread draw-off tube 20 Spinning rotor introduced, so far that it is before the start of the fiber material feed in the rotating spinning rotor still inside the spinning rotor hollow axis or the spinning rotor discharge tube is such that it is with the spinning rotor rotating is not yet exposed to centrifugal force.

If sufficient fiber material is fed into the rotating spinning rotor has been precisely timed that the double-wire twisting spindle is connected Winding unit set in motion, causing the two spun threads into the Hollow spindle are retracted. This means that from one to the other The spindle feeder entering the respective branch works in operation is set, whereby at the same time the other loop branch leading to the spinning rotor is fed into the spinning rotor, so that the free hanging in the spinning rotor Spinning thread ends towards for the purpose of piecing by centrifugal force moved to the fiber material collecting channel of the spinning rotor.

As soon as the thread loop is released, which coincides with the time of the piecing within the spinning rotor, the direction of movement of the loop branch previously fed into the spinning rotor is reversed, so that both spinning threads generated in the spinning rotors are then drawn into the hollow spindle axis. Due to the pinching of the thread loop on the one hand in the area of the clamping surfaces and on the other hand in the area of the roller gap directly adjoining the clamping surfaces, it is ensured that, on the one hand, the spinning rotation in the individual spinning thread is maintained up to the roller gap, and in addition a curling of the individual spinning thread is prevented in the area of the thread loop. Make sure that the two loop branches are clamped at a distance from each other.
A reversal of the spinning twist is thus only possible in the relatively short spun thread section between the roller gap of the individual delivery mechanism and the thread end inserted into the individual spinning rotor. During spinning, however, the spinning rotation generated by the OE spinning rotor also runs into the previously free end of the spinning thread, so that immediately after spinning there are two spinning threads which have the spinning twist required for the double-wire twisting process.

It is thus achieved that the one produced immediately after the piecing process Twine thread sections that are not twisted together over a greater length having.

Reference symbol list:

1

Spindle bench

2nd

Bearing block

3rd

Hollow shaft

4th

whorl

5

Spindle rotor disc

6

Thread guide channel

7

Balloon limiter pot

8th

Thread guide channel

9

Centering eye

10th

Thread guide tube

11

Air ducts

12th

Inner casing

12.1

ground

12.2

Cylinder housing

12.3

cover

12.3 '

Recess

13

Spinning rotor

14

Spinning rotor

15

Drive belt

16

Slip ring contacts

17th

Slip ring contacts

18th

Outer housing

18.1

ground

18.2

lower cylinder housing section

18.3

upper cylinder housing section

April 18

cover

19.1

Channel section ⇒ fiber material

19.2

Channel section ⇒ feed channel

20th

Thread take-off tubes

21

Hollow spindle axis

22

Annular gap seal

23

Air ducts

24th

Air ducts

26

Pulley

27

Pulley

30th

Piecing device

31

Base body

32

ground

33

central opening

34

side opening

35

side opening

36

Clamping surface

37

Clamping surface

38

Clamping plate

38.1

approach

38.2

incision

39

Clamping plate

39.1

approach

39.2

incision

40

Permanent magnet

41

Bearing plate

42

screw

43

wing

44

wing

45

axis

46

Support body

47

Stop body

48

Stop body

51

role

52

role

53

role

54

role

55

Support plate

56

block

F1

Spinning thread

F2

Spinning thread

F3

Thread

F5

Thread loop

R1

OE spinning unit

R2

OE spinning unit

Claims (13)

A method for spinning the free ends of two spun threads of a twisted thread formed from these spun threads in the context of an integrated OE spinning and double-wire twisting process, the method comprising the following steps: (a) a thread end is threaded through the thread guide channel of the spindle rotor disk and through the hollow spindle axis of a double-wire twist spindle opposite to the thread running direction during the proper double-wire twisting process, (b) the two free ends of the filaments are inserted into OE spinning rotors arranged inside the double wire twisting spindle, whereby (c) in front of each free end of the spinning thread in the area between the inlet opening of the spindle hollow axis and the spinning rotor, a thread loop of a predetermined length is generated, which (d) is held and guided in the course of the piecing process subsequently carried out in such a way that (e) their first branch enters the spinning rotor while (f) its second branch is withdrawn into the hollow spindle axis until (g) the thread loop is released and (h) now reversing the direction of movement of the respective first branch, the withdrawal of both originally existing ends of the spun threads in the direction of the spindle hollow axis in order to twist them and thus also the spun threads produced by the OE spinning rotors in accordance with the double-wire twisting process, characterized by the following Steps: (i) the two free ends of the spun thread of the twist thread threaded through the hollow spindle axis according to step (a) are gripped and held in an area with the twist twist still essentially intact, (j) the thread is pulled out of the hollow spindle axis and the thread twist of the thread is turned back over a thread length sufficient to form the thread loop according to (c) such that the spinning twist originally present in the not yet twisted spun threads runs back into the individual threads; (k) the substantially parallel spun threads obtained in this way are separated from one another and thread loops are formed in accordance with (c); (l) The two loop branches of each thread loop are clamped in a clamping device over part of their length up to the loop arch connecting the two loop branches lying parallel to one another before (m) steps (e) to (h) are carried out. Method according to claim 1, characterized in that in step (1) the two loop branches are clamped in at a lateral distance from one another. A method according to claim 1, characterized in that each thread loop is inserted directly after the clamping device into a delivery unit consisting of a pair of rollers, the first loop branch leading to the spinning rotor and the second loop branch leading to the hollow spindle axis. Device for carrying out the method according to one of claims 1 to 3, which device is assigned to a double-wire twisting spindle, in which at least two rotor spinning units next to one another and symmetrically to the hollow spindle axis with spinning rotors (13, 13) above the spindle rotor within the space defined by the thread balloon. 14) are arranged, to which the fiber material is fed and from which the spun threads (F1, F2) are drawn upwards and redirected in their direction of movement by 180 ° and inserted together into the spindle hollow axis, with each spinning rotor (13, 14) above in the area between the extension of the thread take-off tube (20) of the spinning rotor (13, 14) and the extension of the hollow spindle axis (21) there is a deflection roller (26, 27) for deflecting the thread (F1, F2) removed from the spinning rotor by 180 °, being in the immediate vicinity of each deflection roller for storing a thread loop (FS) Given the length of a piecing thread guided into the spinning rotor (1, 2) from the hollow spindle axis, a thread storage element is attached, to which mechanical means for successively releasing and releasing the thread loop (FS) and for placing the piecing thread on the deflection roller after dissolving the thread loop are assigned,
characterized in that
each of the two storage elements has a stationary clamping surface (36, 37) and a movable clamping surface in the form of a clamping plate (38, 39), between which the two branches of the thread loop (FS) extend over part of their length up to the loop arch connecting the two loop branches Can be clamped parallel to each other, and that the mechanical means for the successive release and dissolution of the two thread loops (FS) each consist of a thread delivery mechanism in the form of a pair of rollers (51, 52; 53, 54), which between the two clamping surfaces of each thread storage element and the assigned deflection roller is arranged such that the roller gap directly adjoins the two clamping surfaces. Device according to claim 4, characterized in that the movable clamping surface is formed by a floating clamping plate (38, 39) which can be magnetically adjusted against the stationary clamping surface (36, 37) from a rest position. Device according to claim 5, characterized in that a permanent magnet (39.2) is arranged in the region of the stationary clamping surface and the movable clamping plate (38, 39) consists of magnetic material. Device according to claim 4, characterized in that the stationary clamping surfaces (36, 37) for both piecing threads are formed by the opposite inclined surfaces of a ridge-like block (56). Device according to claim 4, characterized in that the first roller (52, 54) of the roller pair can be adjusted by pivoting against the second roller (51, 53). Device according to claim 8, characterized in that the first roller (52, 54) can be adjusted resiliently against the second roller (51, 53). Device according to claim 4, characterized in that one (51, 53) of the two rollers forming a yarn feed mechanism is mounted in such a way that it can only change its position in a plane which is determined by the axes of the two rollers when the one Role for the formation of the delivery plant against the other role. Device according to claim 10, characterized in that the floating roller (51, 53) is designed as a hollow body which is supported with its inner wall on a spherical support body (46) fastened on an axis (45). Device according to claim 11, characterized in that the spherical support body has the shape of a ball. Device according to claim 11, characterized by stops (47, 48) which bear against the floating roller (51, 53) and which are aligned parallel to the plane defined by the axes of the two rollers on the one hand and perpendicular to the roller gap of the delivery unit on the other.

Images