EP3137661B1 - Draw-off arrangement for a spinning machine - Google Patents

Description

The present invention relates to a take-off arrangement for a spinning machine, which serves for the production of yarn, wherein the take-off arrangement comprises at least one roller and a corresponding counter-roller, between which the yarn is clamped feasible, wherein the trigger assembly comprises at least one loading element, with the aid of the roller can be acted upon by a contact pressure, and wherein the roller is guided by means of at least one pivotally mounted about a pivot axis pivot lever.

Corresponding withdrawal arrangements are known in the prior art in various designs. In general, however, the take-off arrangements always serve the withdrawal of a yarn from the spinning unit of the take-off arrangement having spinning machine in order to subsequently supply the yarn to a winding device, which winds the yarn onto a sleeve. The withdrawal arrangements generally comprise a roller and a corresponding counter-roller, wherein the roller is pressed in the operation of the spinning machine with the aid of a load cylinder in the direction of the counter-roller, so that the yarn with the help of the take-off rollers (= roller and counter roller) by clamping and with a Tensile stress can be acted upon in order to be able to pull off the yarn from said spinning unit.

In principle, the withdrawal arrangements known in the prior art have in common that the withdrawal rollers can be acted upon by a movably mounted loading cylinder with a force in order to be able to clamp a yarn between the loaded roller and the corresponding counter-roller. As a rule, the load cylinder acts directly on the bearing of the take-off roller to be loaded and must therefore be placed above the mentioned roller. This in turn means that the trigger assembly has a relatively large amount of space. At the in DE 10 2007 024 588 A1 and DE 44 31 537 A1 disclosed withdrawal arrangements applied by an actuating means tensile force via a lever assembly and a pressure roller as a compressive force applied to the yarn to be deducted.

The object of the present invention is to propose a take-off arrangement which overcomes the disadvantages of the prior art.

The object is achieved by a trigger assembly with the features of claim 1, wherein at this point it should be noted that the trigger assembly according to the invention may be part of a spinning machine, which may be formed, for example, by means of an air vortex flow from a fiber strand to make a yarn.

In general, it should be made clear at this juncture that the yarn produced can basically be any fiber composite which is characterized in that an outer part of the fibers (so-called binding fibers) is wrapped around an inner, preferably untwisted part of the fibers. to give the desired strength to the corresponding yarn. The term "yarn" in the context of the invention therefore also includes so-called roving. Roving is a yarn with a relatively small proportion of binding fibers, or a yarn in which the binding fibers are wound relatively loosely around the inner core, so that the yarn remains deformable. This is crucial if the produced yarn on a subsequent textile machine (for example, a ring spinning machine) is to be distorted again with the help of a drafting system or must, in order to be further processed accordingly.

According to the invention, the trigger assembly is characterized by the fact that it comprises a force transmission element, wherein at least a part of the force transmission element on the one hand with the loading element and on the other hand with the pivot lever is operatively connected, wherein the pivot lever of the guide is to be loaded roller, wherein one of the loading element generated contact force on the force transmitting element in operative connection with the power transmission element and from there to the standing with the power transmission element operatively connected to the pivot lever and thus on the guided by the pivot lever roller is transferable.

The loading element, which may include, for example, a movable load cylinder or even the pressure element described in more detail below, so is not directly related to the roller of the trigger assembly to be loaded. Rather, the power transmission via the said power transmission element which transmits the contact force generated by the loading element from the loading element to the pivot lever, which in turn serves to support the roller to be loaded.

Due to the corresponding configuration of the force transmission element and the pivot lever, it is possible according to the present invention to redirect the force generated by the loading element, which causes a pressing of the roller against its corresponding counter-roller. The loading element therefore no longer has to be movable in the direction of the roller to be loaded so that it can be pressed against the corresponding counter roller. Rather, it is conceivable that the loading element generates a force which deviates from the direction of movement of the roller between its loaded and its unloaded position. The loading element could be, for example, laterally of an imaginary plane on which the axes of the roller and the counter-roller are located. In this context, it would be useful, for example, if the pivot lever and the force transmission element enclose an angle which is between 70 ° and 110 °, preferably between 80 ° and 100 °. In general, it is also conceivable that the force transmission element represents an extension of the standing with him operatively connected pivot lever or branches off from this. In any case, it is now possible that the direction of movement of the loading element or its movable components deviates from the direction of movement of the roller, so that the trigger assembly only requires a relatively small space with appropriate alignment of the power transmission element and pivot lever.

In this context, it is extremely advantageous if the loading element comprises a movably mounted pressure element whose direction of movement encloses an angle α in a side view of the take-off arrangement with a transport direction of the take-off arrangement whose amount is 0 ° to 30 °, preferably 0 ° to 20 °, especially preferably 0 ° to 10 °, is (the side view is defined as the view whose axis of view is parallel to the axes of rotation of roller and counter-roller). In contrast to the prior art, the force generated by the pressure element is therefore no longer direct directed to the axis of the roller to be loaded by the pressure element. Rather, an orientation is conceivable in which the direction of movement of the pressure element and thus the force vector of the force generated by the pressure element intersects the connecting plane of the axes of rotation of roller and counter-roller at an angle which is between 60 ° and 90 °. In this case, the loading element no longer has to be placed on the opposite side of the roller to be loaded by the loading element from the corresponding counter-roller. Rather, the loading element (bzw.'das said pressure element) may be arranged in a side view of the trigger assembly adjacent to the plane which is spanned by the axes of rotation of the roller and the backing roll, so that the height of the trigger assembly over the prior art are significantly reduced can. Has proven particularly useful an arrangement in which the direction of movement of the loading element or the corresponding pressure element is aligned parallel to the transport direction of the yarn. The force of the loading element thus acts in the direction of yarn transport, while the associated pivot lever and the force transmission element according to the invention causes a deflection of this force in the direction of the counter roll, which is assigned to the loaded roller of the loading element. In other words, the loading element, pivoting lever, force transmission element and roller are preferably aligned with each other such that movement of the loading element (or its pressure element) in the transport direction exerts a force on the roller whose direction is aligned perpendicular to the direction of movement of the loading element (or its pressure element) is.

It is also advantageous if the loading element comprises a movably mounted pressure element whose direction of movement in a plan view of the trigger assembly parallel to a transport direction of the trigger assembly (the plan view is defined as the view whose axis of view perpendicular to the axes of rotation of the roller and counter-roller and perpendicular to the transport direction of the yarn within the trigger assembly runs). If the trigger assembly has only one roller and one counter roller, then it is also advantageous if the loading element, the force transmission element associated therewith and / or the pivot lever are arranged laterally in the plan view of the roller body of the roller or the counter roller the roll body is the component of the roll or counter roll which is in contact with the yarn during operation of the drawing assembly).

It is also advantageous if the loading element comprises a movably mounted pressure element, wherein the pressure element is formed by an elastic pressure membrane or is in communication with an elastic pressure membrane, wherein the pressure membrane limits a pressure chamber, which can be acted upon by a pressure, for example by means of a compressed air source is. The pressure membrane is preferably a flat or arched and elastic structure (eg made of a rubber or a rubber mixture). If the pressure chamber, which may be partially bounded by the pressure membrane and partially by a corresponding housing, subjected to a pressure, so the pressure membrane bulges outward, or tries to buckle accordingly (the pressure by introducing compressed air into the Pressure chamber can be generated). If the pressure diaphragm is now in contact with the force transmission element, then the pressure can be transmitted via the force transmission element to the pivot lever and finally to the roller rotatably guided by the pivot lever. The load of the roller is thus primarily with the aid of compressed air, which can be provided by a compressed air network of the respective spinning or a compressor of the take-off arrangement having spinning machine. The advantage of using a corresponding membrane lies in the fact that in the pressure-related movement no static friction must be overcome because no mutually rubbing components are present. Rather, only the shape of the membrane must be changed to load the roller, which is done for example by introducing compressed air into the pressure chamber. The loading force or a change in the loading force is in this case accurately, reproducibly and without jerky load changes possible. In contrast, in the cylinder-piston solutions known in the state of the art, a jerky movement absorption always occurs when the load is changed, since the static friction between the cylinder and the piston must first be overcome before a relative sliding movement between the two elements is possible ,

Furthermore, it is advantageous if the force transmission element is mounted pivotably about a pivot axis. The pivot axis preferably runs parallel to the axis of rotation of the roller which is in operative connection with the force transmission element. The pivot angle is preferably only a few degrees (conceivable is also a pivot angle of less than one degree). The force transmission element can also be designed as an elongated element or U-shaped, wherein the legs of the U-shape preferably directly or via a contact region, the z. B. may be formed as an element connecting the legs, are in communication with the loading element.

It is particularly advantageous if the force transmission element is pivotably mounted about the pivot axis of the pivot lever operatively connected to the force transmission element. Also, the pivot lever may have an elongated or angled shape. It is also possible to make the pivot lever U-shaped, wherein the base of the U-shape may for example comprise a receptacle for the axis of one or more rollers (the receptacle may for example be in the form of a hole perpendicular to the direction of motion of the Can load element or the above-mentioned pressure element extend). The pivot axis can again be in the form of a bolt, which is mounted, for example, on or in a carrier, which also serves to support the loading element.

It is also advantageous if the force transmission element has a contact area, via which it is in communication with the loading element, wherein the contact area may be flat or point or line-shaped. Likewise, as already indicated, the contact region can be formed by a connecting element, for example a connecting bolt, which connects two sections of the force-transmitting element to one another. In any case, it is advantageous if the pivot lever is a receptacle, for. B. has a bore or a bearing for a rotation axis of the roller, wherein it has proven useful when the distance (A1) between the axis of rotation of the roller (or its central axis about which the axis of rotation is rotatable) and the pivot axis of the pivot lever is smaller than the distance (A2) between the pivot axis of the pivot lever and the contact region of the power transmission element. In this case, the power transmission element can act together with the pivot lever as a lever, which causes an increase of the contact force generated by the corresponding loading element. In particular, it is advantageous if the ratio of A2 to A1 is in a range of 1.1 to 1.5.

It is advantageous if the force transmission element is at least partially designed as a lever. The force transmission element may, for example, an elongated basic structure or a plurality of sections, each of which may be elongated seen in itself. Also conceivable is a u-shape, wherein the force transmission element preferably extends from the pivot axis of the pivot lever in the direction of the corresponding loading element. The power transmission element can also be rectilinear or curved in the side view of the trigger assembly.

Also, it is extremely advantageous if the force transmission element is at least partially formed as a branch of the pivot lever. For example, it would be conceivable that the force transmission element and the associated pivot lever in the side view of the trigger assembly form an L-shape, wherein the pivot lever preferably in the transport direction of the yarn and the transmission element extending perpendicular thereto. Pivot lever and power transmission element can thus include in the above-mentioned side an angle which is preferably between 80 ° and 100 ° (preferably an angle of 90 °).

It is also advantageous if the force transmission element is at least partially designed as an extension of the pivot lever. The pivot lever extends in this case in the side view of the trigger assembly preferably from the recording of the axis of rotation of the roller to its pivot axis. There he goes into the power transmission element, which eventually extends to the corresponding load element or its pressure element. The extension may in this case co-linear with the longitudinal axis of the pivot lever or angled run from this.

Also, it is extremely advantageous if the pivot lever has a receptacle for a rotation axis of the roller, wherein the pivot axis of the pivot lever between the Can be arranged receiving the axis of rotation and a contact region of the pivot lever operatively connected to the power transmission element, via which the force transmission element is in operative connection with the loading element or its pressure element. The pivot axis is therefore preferably arranged in a middle region of the component composed of the pivot lever and the force transmission element, while the contact region and the receptacle of the roll rotation axis can be placed on, for example opposite, end sections of said component. Both the power transmission element and the pivot lever are here jointly pivotable about the pivot axis of the pivot lever, so that only a storage of the component is necessary.

Particular advantages arise when at least a portion of the pivoting lever and at least a portion of the power transmission element operatively connected to the pivoting lever are integrally formed. In addition to a particularly high stability of the resulting component can be ensured by the one-piece design and high precision in its manufacture, since relative movements of the pivot lever and the power transmission element are not possible. The component can also basically have an H-shaped basic structure, wherein in each case the two pointing in a first direction leg part of the force transmission element and the two pointing in the second direction leg can be part of the pivot lever, and wherein the pivot axis in the region of the middle beam of H-shape can be located. By the way, the H-shape does not have to lie in one plane.

Furthermore, it is advantageous if the loading element is a pneumatic, electrical or electromagnetic loading element. For example, the loading element may comprise a pressure element which can be acted upon by a pressure medium (gas, preferably air or liquid). However, it is also conceivable that the loading or pressure element is realized by means of an electromagnet or a spring element.

Particular advantages it brings with it when the loading element as well as standing in operative connection with the loading element force transmission element and / or the with the power transmission element operatively connected pivot lever are mounted on a common carrier of the trigger assembly. The carrier thus serves as a fixing element, which preferably connects the loading element, the pivot lever and also the force transmission element of a respective roller arrangement with said base frame or an intermediate element. For example, the carrier may have a bore through which the pivot axis of the pivot lever extends. It is also conceivable that the pivot axis extends on both sides of the carrier to the outside and is encompassed there in each case by a portion or leg of the pivot lever. Finally, the loading element and, if necessary, the pivoting lever are preferably detachably connected to the carrier in order to ensure easy maintenance or repair of said parts.

Finally, it is advantageous if the force transmission element and the pivoting lever operatively connected to the force transmission element are mounted on a common carrier. The fixation or storage of the power transmission element thus does not take place directly on a stationary carrier or the base frame of the spinning machine. Rather, the power transmission element is connected via the pivot lever to the carrier, resulting in a particularly simple construction (wherein pivot lever and power transmission element can of course be formed in one piece).

Figur 1

eine schematische Seitenansicht einer Spinnmaschine mit einer erfindungsgemäßen Abzugsanordnung,

Figur 2

einen schematischen Ausschnitt einer Seitenansicht einer erfindungsgemäßen Abzugsanordnung,

Figur 3

eine alternative Ausführung des in Figur 2 gezeigten Ausschnitts,

Figur 4

eine perspektivische Ansicht eines schematischen Ausschnitts einer erfindungsgemäßen Abzugsanordnung,

Figur 5

einen weiteren schematischen Ausschnitt einer Seitenansicht einer erfindungsgemäßen Abzugsanordnung,

Figur 6

den Ausschnitt gemäß Figur 5, ergänzt durch in Figur 5 nicht gezeigte Abschnitte des Schwenkhebels und des Kraftübertragungselements,

Figur 7

den Ausschnitt gemäß Figur 6 mit eingesetzter Walze,

Figur 8

eine Ausführungsform eines Belastungselements,

Figur 9

einen schematischen Ausschnitt einer Seitenansicht einer weiteren erfindungsgemäßen Abzugsanordnung,

Figur 10

eine perspektivische Ansicht eines schematischen Ausschnitts einer weiteren erfindungsgemäßen Abzugsanordnung basierend auf Figur 9, und

Figur 11

einen schematischen Ausschnitt einer Seitenansicht einer weiteren erfindungsgemäßen Abzugsanordnung.

Further advantages of the invention are described in the following exemplary embodiments. Show it:

FIG. 1

a schematic side view of a spinning machine with a trigger assembly according to the invention,

FIG. 2

a schematic detail of a side view of a trigger assembly according to the invention,

FIG. 3

an alternative embodiment of the in FIG. 2 shown detail,

FIG. 4

a perspective view of a schematic section of a trigger assembly according to the invention,

FIG. 5

a further schematic section of a side view of a trigger assembly according to the invention,

FIG. 6

the clipping according to FIG. 5 , supplemented by in FIG. 5 not shown portions of the pivot lever and the power transmission element,

FIG. 7

the clipping according to FIG. 6 with inserted roller,

FIG. 8

an embodiment of a loading element,

FIG. 9

a schematic detail of a side view of another trigger arrangement according to the invention,

FIG. 10

a perspective view of a schematic section of another trigger assembly according to the invention based on FIG. 9 , and

FIG. 11

a schematic section of a side view of another trigger assembly according to the invention.

FIG. 1 shows a schematic side view of a spinning machine with a trigger assembly according to the invention 1. Basically, the inventive withdrawal assembly 1 can be used in all spinning machines in which the produced yarn 2 must be actively withdrawn from the spinning unit or its yarn-forming unit 18. These include, for example, rotor or air spinning machines, said air spinning machines may be formed to produce a conventional yarn or a so-called roving from a corresponding spinning machine supplied fiber strand 20 (with regard to the term roving is made to the above description).

If the spinning machine according to the invention with the take-off arrangement 1 is an air-spinning machine, this usually has a drafting system 25 with a plurality of successively arranged roller arrangements 26. The drafting rollers 19 (of which only one is provided with a reference numeral for reasons of clarity) of the roller arrangements 26 are rotated by means of one or more drives in the operation of the drafting system 25 in a rotation, wherein the rotational speeds of the drafting rollers 19 of the individual roller assemblies 26 increase in the transport direction T of the fiber composite 20, thereby causing warping and uniformity of the fiber composite 20.

Is it in the drafting 25 having spinning machine, as in FIG. 1 shown, an air-jet spinning machine, which serves the production of yarn 2, the drafting 25 is followed by a yarn-forming unit 18, in which the fiber structure 20 receives a rotation by means of a fluidized air flow.

In the transport direction T, the yarn-forming unit 18 is finally followed by a take-off arrangement 1, which preferably comprises a take-off roll pair with a roll 3 and a counter roll 4, wherein the roll 3 and / or the counter roll 4 are likewise driven by means of a drive during operation of the spinning frame to peel the yarn 2 from the yarn forming unit 18.

Finally, the yarn 2 enters the region of a traversing unit 21, which leads the yarn 2 iridescent, while it is wound on a sleeve 22, which is preferably displaceable by means of a sleeve drive 23 in a rotary motion.

A section of a trigger assembly 1 according to the invention FIG. 2 ,

In general, the invention is characterized by the fact that the roller 3 of the trigger assembly 1 to be loaded is guided by means of a pivot lever 7 mounted about a pivot axis 6 (the pivot axis 6 is, as explained below by way of example, at an in FIG. 2 not shown support 12 or base frame 13 of the spinning machine or the trigger assembly 1 stored). For this purpose, the pivot lever 7 in addition to a receptacle for the pivot axis 6 (which incidentally also integrally with the Swivel lever 7 may be formed) comprise a receptacle 10 for the axis of rotation 11 of the roller 3 (see FIGS. 5 to 7 ). In addition, a force transmission element 8 is provided, on the one hand with the pivot lever 7 in operative connection (or is formed integrally therewith) and on the other hand with a loading element 5 is in contact or can be brought, with the help of a force generated by the loading element 5 ( which is directed in the direction of movement B of the loading element 5 shown) on the pivot axis 6 and ultimately on the roller 3 and its axis of rotation 11 is transferable. For this purpose, the force transmission element 8 has a contact region 9, which is in operative connection or direct contact with the loading element 5, at least in the loaded state of the roller 3, wherein the contact region 9 can be flat, linear or point-shaped.

The advantage of the solution according to the invention lies in the fact that the contact force generated by the loading element 5 is deflected by interaction of the force transmission element 8 and the pivot lever 7. The direction of movement B of the loading element 5 therefore no longer has to be aligned in a direction perpendicular to the axis of rotation 11 of the roller 3 or in the direction of the pivot lever 7, as is customary in the prior art. Rather, it is conceivable to align the loading element 5 such that its direction of movement B in the in FIG. 2 shown side view parallel to the transport direction T of the corresponding trigger assembly 1 passing yarn 2 runs. Due to the orientation of the force transmission element 8, which is preferably aligned perpendicular to said transport direction T, a transfer of the loading force to the pivot lever 7, wherein the pivot lever 7 and the power transmission element 8 are preferably mounted together on the pivot axis 6 of the pivot lever 7.

As a result, therefore, there is a deflection of the contact force generated by the loading element 5 from a direction parallel to the transport direction T to a direction preferably perpendicular to this direction, so that the roller 3 based on FIG. 2 is pressed down, although the direction of movement B of the loading element 5 extends from right to left.

Further shows FIG. 2 by way of example, it may be advantageous if the force transmission element 8 and the pivot axis 6 are integrally formed, wherein in the transition region between the two sections preferably a receptacle 10 for the axis of rotation 11 of the roller 3 shown is arranged.

That in addition to a parallel orientation of the transport direction T and direction of movement B of the yarn 2 and a deviating orientation is conceivable, shows by way of example FIG. 3 , Compared to the in FIG. 2 the embodiment shown, the power transmission element 8 is slightly inclined in the transport direction T, so that the direction of movement B of the loading element 5 and the transport direction T in the side view of the trigger assembly 1 include an angle α, the amount of which deviates from 0 ° (the amount is preferably not more than 30 °) ,

A schematic perspective of a roller 3 with associated loading arrangement shows FIG. 4 , As can be seen from this illustration, it can be advantageous if the pivoting lever 7 and / or the force transmission element 8 have a plurality of sections, each extending laterally of the loading element 5 in order to increase the stability of the arrangement. The pivot lever 7 may be connected, for example via corresponding portions of a pivot axis 6 or alternatively via two inwardly directed pivot lever 7 with a support 12, which in turn may be part of the trigger assembly 1. The single-part or multi-part pivoting lever 7 in turn is followed by the power transmission element 8, which may also consist of several sections. For example, it is conceivable that the contact region 9, via which it is in operative connection with the loading element 5, is designed as a connecting element which extends between two limbs of the force transmission element 8, which in turn can be formed as an extension of the legs of the pivot lever 7.

Further shows FIG. 4 in that it is generally provided that the roller 3 (and thus also the counter-roller 4, not shown) has only one roller body, which extends from the axis of rotation 11 of the roller 3 to one side (the roller body is the turning part of the roll 3, which is in contact with the yarn 2 during operation of the drawing assembly 1).

Finally is FIG. 4 can be seen that the carrier 12, on which the pivot lever 7 and thus the roller 3 and the power transmission element 8 can be stored, with a base frame 13 of the trigger assembly 1 and the trigger assembly 1 having spinning machine can be connected.

Further details of in FIG. 4 indicated execution are the FIGS. 5 to 7 to be taken, where FIG. 7 the load arrangement (= load element 5, pivot lever 7 and power transmission element 8) according to FIG. 4 with inserted roller 3 shows. FIG. 6 shows the arrangement according to FIG. 7 without roller 3. FIG. 5 finally shows the arrangement according to FIG. 6 , wherein the reference to the leaf level upper portion of the pivot lever 7 and the upper portion of the power transmission element 8 have been omitted in order to show additional details.

In addition, it can be seen that the pivot lever 7 preferably has a receptacle 10 in the form of a bore which serves to receive the axis of rotation 11 of the roller 3. The receptacle 10 is in this case preferably placed in the transition region to the force transmission element 8.

Further shows FIG. 8 a possible embodiment of the loading element 5. While, of course, electrically or electromechanically acting loading elements 5 can be used, it has proven useful if the loading element 5 comprises a pressure element 14 which is formed by an elastic pressure membrane 15 or with a corresponding pressure membrane 15 in Connection stands. As a pressure element 14 z. Example, a metal plate is used, which is connected to the pressure diaphragm 15 and which serves the system to the contact area 9 of the power transmission element 8.

The pressure membrane 15 can in plan view (in FIG. 8 : View from the left) be formed circular and limit a pressure chamber 16, which is otherwise surrounded by a housing 24. The pressure chamber 16 is in turn connected to a compressed air source 17 or a Connected fluid source, so that the internal pressure of the pressure chamber 16 and thus the shape of the pressure diaphragm 15, for example via a controller, can be varied to thereby adjust the contact pressure generated by the loading element 5 (in the example shown, the compressed air source 17 as represented by the housing 24 branching tube, which of course with a pressure accumulator or a pressure generator, for example, the spinning-own compressed air network or a compressor, in conjunction).

In addition, in FIG. 9 a further embodiment of a trigger assembly 1 according to the invention shown. As can be seen, the pivot axis 6 of the pivot lever 7 between the receptacle 10 of the roller 3 and the contact region 9 of the force transmission element 8 is arranged here. In addition, the roller 3 to be loaded is placed below the counter-roller 4, without any restrictions on the operation of the trigger assembly 1. The transmission of the contact pressure generated by the loading element 5 finally takes place in this case also via the force transmission element 8 on the pivot lever 7 and only from there on the axis of rotation 11 of the roller third

In addition to FIG. 9 shows FIG. 10 in that it is conceivable, in principle, to mount both the roller 3 and the corresponding counter-roller 4 on a common support 12, wherein the bearing of the roller 3 preferably takes place via the pivoting lever 7.

Finally, with reference to FIG. 10 pointed out that the distance A1 between the axis of rotation 11 of the roller 3 (ie, the central axis) and the pivot axis 6 is preferably smaller than the distance A2 between the pivot axis 6 of the pivot lever 7 and the contact region 9 of the force transmission element 8. This creates a leverage, so that the contact force generated by the loading element 5 is reinforced prior to transmission to the axis of rotation 11 of the roller 3.

Finally, in FIG. 11 a schematic section of a side view of another trigger assembly 1 according to the invention shown. The power transmission element 8 is connected in this case with the pivot lever 7, wherein the connection is detachable may be configured to exchange the power transmission element 8 can. For example, it would also be conceivable to fix the force transmission element 8 on the pivot lever 7 such that its distance from the pivot axis 6 is adjustable. By choosing the distance, finally, the force acting on the roller 3 load force would be adjustable, since this depends on the force generated by the loading element 5 and the distance of the power transmission element 8 of the pivot axis 6 due to the lever law

The present invention is not limited to the illustrated and described embodiments. Variations within the scope of the claims are also possible as any combination of the features described, even if they are shown and described in different parts of the description or the claims or in different embodiments.

LIST OF REFERENCE NUMBERS

1

trigger assembly

2

yarn

3

roller

4

backing roll

5

loading element

6

swivel axis

7

pivoting lever

8th

Power transmission element

9

contact area

10

admission

11

axis of rotation

12

carrier

13

base frame

14

pressure element

15

pressure membrane

16

pressure chamber

17

Compressed air source

18

spinneret

19

Drafting system roller

20

fiber structure

21

Traversing unit

22

shell

23

sleeve driving

24

casing

25

drawing frame

26

roll arrangement

B

movement direction

T

transport direction

α

Angle between the transport direction of the fiber composite and the direction of movement of a loading element or its pressure element

A1

Distance between the axis of rotation of the roller and the pivot axis of the pivot lever

A2

Distance between the pivot axis of the pivot lever and the contact region of the power transmission element

Claims (15)

1. A draw-off arrangement for a spinning machine for drawing off a yarn (2),

   - wherein the draw-off arrangement (1) comprises at least one roller (3) and one corresponding counter-roller (4), between which the yarn (2) can be guided in a clamped manner,

   - wherein the draw-off arrangement (1) comprises at least one loading element (5), by means of which a pressing force can be applied to the roller (3), and

   - wherein the roller (3) is guided by means of at least one swivel lever (7) which is mounted so as to be movable about a swivel axle (6),

   wherein the draw-off arrangement (1) moreover comprises a force transmission element (8), wherein at least a portion of the force transmission element (8) is operatively connected at one side to the loading element (5) and at the other side to the swivel lever (7), characterized in that
   a pressing force generated by the loading element (5) can be transmitted to the force transmission element (8) operatively connected to the loading element (5) and from there to the swivel lever (7) operatively connected to the force transmission element (8) and thus to the roller (3) guided by the swivel lever (7).
2. The draw-off arrangement according to the preceding claim, characterized in that at least one loading element (5) comprises a movably mounted pressing element (14), the movement direction (B) of which, in a side view of the draw-off arrangement (1), encloses with a transport direction (T) of the draw-off arrangement (1) an angle α of 0° to 30°, preferably 0° to 20°, particularly preferably 0° to 10°, wherein the side view is defined as the view seen along a viewing axis that runs parallel to the rotation axles of the roller and counter-roller.
3. The draw-off arrangement according to any of the preceding claims, characterized in that the loading element (5) comprises a movably mounted pressing element (14), the movement direction (B) of which, in a plan view of the draw-off arrangement (1), runs parallel to a transport direction (T) of the draw-off arrangement (1), wherein the plan view is defined as the view seen along a viewing axis that runs perpendicular to the rotation axles of the roller and counter-roller and perpendicular to the transport direction of the yarn within the draw-off arrangement.
4. The draw-off arrangement according to any of the preceding claims, characterized in that the loading element (5) comprises a movably mounted pressing element (14), wherein the pressing element (14) is formed by an elastic pressure membrane (15) or is connected to an elastic pressure membrane (15), wherein the pressure membrane (15) delimits a pressure chamber (16), to which a pressure can be applied preferably by means of a compressed air source (17).
5. The draw-off arrangement according to any of the preceding claims, characterized in that the force transmission element (8) is mounted so as to be able to swivel about a swivel axle (6).
6. The draw-off arrangement according to any of the preceding claims, characterized in that the force transmission element (8) is mounted so as to be able to swivel about the swivel axle (6) of the swivel lever (7) operatively connected to the force transmission element (8).
7. The draw-off arrangement according to any of the preceding claims, characterized in that the force transmission element (8) has a contact area (9), via which it is connected to a loading element (5), in that the swivel lever (7) has a receptacle (10) for a rotation axle (11) of the roller (3), and in that the distance (A1) between the rotation axle (11) of the roller (3) and the swivel axle (6) of the swivel lever (7) is smaller than the distance (A2) between the swivel axle (6) of the swivel lever (7) and the contact area (9) of the force transmission element (8).
8. The draw-off arrangement according to any of the preceding claims, characterized in that the force transmission element (8) is formed at least partially as a lever.
9. The draw-off arrangement according to any of the preceding claims, characterized in that the force transmission element (8) is formed at least partially as a branch of a swivel lever (7).
10. The draw-off arrangement according to any of the preceding claims, characterized in that the force transmission element (8) is formed at least partially as an extension of the swivel lever (7).
11. The draw-off arrangement according to any of the preceding claims, characterized in that the swivel lever (7) has a receptacle (10) for a rotation axle (11) of the roller (3), wherein the swivel axle (6) of the swivel lever (7) is arranged between the receptacle (10) for the rotation axle (10) and a contact area (9) of the force transmission element (8) operatively connected to the swivel lever (7), via which contact area the force transmission element (8) is operatively connected to a loading element (5).
12. The draw-off arrangement according to any of the preceding claims, characterized in that at least one section of the swivel lever (7) and at least one section of the force transmission element (8) operatively connected to the swivel lever (7) are formed in one piece.
13. The draw-off arrangement according to any of the preceding claims, characterized in that the loading element (5) is a pneumatic, electric or electromagnetic loading element.
14. The draw-off arrangement according to any of the preceding claims, characterized in that the loading element (5) and the force transmission element (8) operatively connected to the loading element (5) and/or the swivel lever (7) operatively connected to the force transmission element (8) are mounted on a common carrier (12) of the draw-off arrangement (1).
15. The draw-off arrangement according to any of the preceding claims, characterized in that the force transmission element (8) is mounted on a common carrier (12) via the swivel lever (7) operatively connected to the force transmission element (8).

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