JP2023017712A - Work station of winding machine and thread rewinding method - Google Patents

Abstract

To provide a method for rewinding a thread from a bobbin comprising a rewinding sleeve onto the winding sleeve.SOLUTION: Regarding a work station of a winding machine for rewinding a thread from a spinning sleeve 3 onto a winding sleeve, the work station comprises a balloon limiting device having a first balloon limiter 6 and a second balloon limiter 7. When the work station operates, the first balloon limiter and the second balloon limiter respectively comprise at least one thread guide face 8 for a specific period during a rewinding procedure. The face surrounds the spinning sleeve at a delivery position, and the minimum distance between the thread guide face of the first balloon limiter and the rotary axis of the spinning sleeve is greater than the minimum distance between the thread guide face of the second balloon limiter and the rotary axis. Also provided is a thread rewinding method.SELECTED DRAWING: Figure 3

Description

The present invention relates to a work station of a winder for unwinding yarn from a spinning sleeve located at the unwinding position of the work station onto a take-up sleeve, said work station connecting the spinning sleeve and the take-up sleeve during the unwinding procedure. a balloon limiting device for spatially limiting the yarn balloon formed between the sleeve, the balloon limiting device comprising a first balloon limiter and a second balloon limiter, the first balloon limiter is positioned downstream of the second balloon limiter in a particular direction of thread travel.

The invention further relates to a method of unwinding yarn from a bobbin containing a winding sleeve onto a winding sleeve.

An automatic winder has the function of unwinding yarn from an individually wound spinning sleeve, e.g. originating from a ring spinning machine, onto a take-up sleeve, thereby providing a larger bobbin (usually known as a cross-wound bobbin). manufactured). This is necessary for subsequent further processing of the yarns, as the spinning sleeve usually has relatively few yarns due to machine conditions. A winding machine usually comprises a plurality of winding stations which perform the unwinding process substantially independently of each other.

During the unwinding process, the yarns from the individual spinning sleeves are sequentially spliced into a single continuous yarn by what is known as a splicer. The unwinding process on the winder is also used to remove yarn imperfections caused by the spinning process on the upstream spinning machine. To this end, for example, the yarn quality is monitored by one or more yarn sensors, and when a yarn defect is detected, a process known as a quality cut (aka clearer cut) is automatically performed. be. Yarn defects are removed and the resulting yarn ends are spliced again with a splicer.

During the unwinding procedure from the spinning sleeve onto the winding sleeve, a yarn balloon occurs between the payout position, in which the winding sleeve rests during the unwinding process, and the yarn guide downstream of the spinning sleeve in the running direction of the yarn. . Said yarn balloon is formed by the centrifugal force acting on the yarn as it is unwound from the spinning sleeve. The greater the radius of the thread balloon during the unwinding process, the greater the thread tension in the area of the thread balloon.

Therefore, in order to keep the yarn tension as low as possible during the unwinding process and to minimize the frequency of yarn breakage and the risk of other adverse effects on yarn quality, influence the shape and size of the yarn balloon, Many attempts have been made to limit it.

An example of this is given by US Pat. No. 6,200,000, in which a balloon restrictor is coupled to a sensor whereby the position of the balloon restrictor during the unwinding procedure is determined by the yarn body (i.e. the yarn present on the spinning sleeve). can be adjusted according to the shape of the However, this requires the sensor and a drive to continuously move the balloon limiter in response to the sensor signal. This solution is therefore relatively complex and correspondingly expensive. Also, dust and lint accumulate on the sensor, which can easily cause sensor errors.

German Offenlegungsschrift 10 2016 115 256 A1

SUMMARY OF THE INVENTION It is therefore an object of the present invention to propose a winding machine work station with a balloon limiting device and a method for unwinding yarn from a spinning sleeve onto a winding sleeve, which is distinct from the known prior art. is.

This object is achieved by a winder work station and a method with the features of the independent claims.

The workstation according to the invention also comprises a balloon limiting device between the spinning sleeve fixed in the payout position and the downstream yarn guide for spatially limiting the yarn balloon formed during the unwinding process.

The balloon limiting device comprises a first balloon limiter and a second balloon limiter, the first balloon limiter being arranged downstream of the second balloon limiter in a particular direction of travel of the yarn. The running direction of the yarn substantially corresponds to the direction of movement of the yarn from the spinning sleeve in the direction of the winding sleeve.

According to the invention, when the work station is in operation, the first balloon limiter and the second balloon limiter each have one yarn guiding surface during at least a certain period of time during the unwinding procedure; Said surface at least partially or completely surrounds the spinning sleeve, which is in the payout position, and provides a restriction of the yarn balloon during the payout process. Therefore, the yarn balloon can only expand perpendicular to the axis of rotation of the spinning sleeve as long as it does not come into contact with one or more yarn guiding surfaces. This axis of rotation is usually the central longitudinal axis of the rotationally symmetrical spinning sleeve. However, the spinning sleeve does not rotate during the unwinding procedure.

According to the invention, the minimum distance A1 between the yarn guiding surface of the first balloon limiter and the axis of rotation of the spinning sleeve is equal to the distance between the yarn guiding surface of the second balloon limiter and said axis of rotation, at least during said period. greater than the minimum distance A2 between The minimum distance in each case is defined as the distance between the axis of rotation and the area of the thread guiding surface which is the smallest distance from the axis of rotation in a spatial sense.

The balloon limiting device according to the present invention comprises two or more balloon limiters, the yarn guiding surface of the first balloon limiter, at least part of it being at least during a certain period of time during the unwinding process, the rotation axis of the spinning sleeve. i.e. the distance from the yarn body arranged on the spinning sleeve differs from the yarn guiding surface of the second balloon limiter, or at least part thereof, during said period.

Preferably, according to the invention, each of the first balloon limiter and the second balloon limiter moves between an actuated position in which it remains during the unwinding procedure, in particular during said period, and a rest position, wherein the rest position is at rest. The position is, inter alia, characterized in that after the unwinding procedure the exchange of an empty spinning sleeve with a new spinning sleeve wound with yarn can be carried out without collision between the spinning sleeve and the balloon limiter.

In addition to the rest position, each balloon limiter preferably has at least one actuated position. The location of the working position is particularly spatially distinct from the corresponding rest position. Additionally or alternatively, the first and/or second balloon limiters may each comprise a plurality of restriction elements, the position or spatial location of each restriction element in the actuated position being associated with a corresponding restriction in the rest position. Different from the position or spatial location of an element.

For example, the first balloon limiter and/or the second balloon limiter can have a rest position in the region above the spinning sleeve when the spinning sleeve is in the paid-out position. In this position, empty spinning sleeves can be replaced with new spinning sleeves wound with yarn while avoiding the risk of collisions between each spinning sleeve and the limiter(s).

In particular, when the work station is in operation, each of the first balloon limiter and the second balloon limiter has one yarn guiding surface surrounding the spinning sleeve in the payout position, the yarn guiding surface of the first balloon limiter The minimum distance A1 between the surface and the axis of rotation of the spinning sleeve is greater than the minimum distance A2 between the yarn guiding surface of the second balloon limiter and said axis of rotation. In this case, the "specified period of time" above is preferably the same as when the first and/or second balloon limiters are in their actuated position.

The yarn guiding surfaces of the individual balloon limiters surround the yarn body of the spinning sleeve, preferably in a plane perpendicular to its axis of rotation, in their corresponding operating position and/or during said specific period of time. It is further advantageous if the thread guiding surfaces of the balloon limiter are spaced apart from each other in the direction of the axis of rotation in their respective operating positions and/or during said specific period of time. In particular, the first balloon limiter is arranged downstream of the second balloon limiter in the yarn running direction.

Both the operating position of the first balloon limiter and the operating position of the second balloon limiter lie in a plane that intersects the spinning sleeve in the payout position. In other words, both the first balloon limiter and the second balloon limiter, or at least their yarn guiding surfaces, are arranged so that when the respective balloon limiter is in the operating position, said limiter at least urges the spinning sleeve in the paid-out position. in a partially encircling position.

In particular, the two balloon limiters assume their respective actuated positions at different times. Thus, when first the first balloon limiter is moved from its rest position to its active position and at the start of the unwinding procedure said limiter surrounds the cylindrical portion of the bobbin (i.e. the spinning sleeve with the yarn on it). Advantageous. Then, when the thread balloon is formed during the unwinding procedure, said balloon is spatially limited from the outside by the thread guiding surface of the first balloon limiter.

A bobbin coming out of a ring spinning machine typically includes a thread body having a cylindrical portion and two adjacent conical portions (hereinafter referred to as bobbin cones) on either side thereof. Due to the spinning process of the ring spinning machine, the yarn is not drawn out uniformly from the entire yarn body during rewinding. Rather, the yarn payout is stepped and the spinning sleeve is gradually released from the yarn and exposed. In other words, the first or top portion moves during the unwinding process towards the second or bottom conical portion and the height of the cylindrical portion decreases.

When the first conical portion (the portion facing the take-up sleeve) reaches the second balloon limiter, said limiter can be moved into its operating position so that at least the yarn guiding surface of the second balloon limiter Preferably the minimum distance between the part and the axis of rotation of the spinning sleeve is reduced. At this point, the yarn contacts the second balloon limiter, so said limiter (either alone or in conjunction with the first balloon limiter) provides spatial restriction of the yarn balloon.

In particular, if the work station comprises a drive device capable of moving the first balloon limiter and the second balloon limiter independently of each other and/or together between their corresponding actuated and rest positions. Advantageous. The drive may comprise, for example, one or more electric motors, pneumatic drives or hydraulic drives, or combinations of these elements. A drive is actuated by an electric motor to effect linear movement of the first and/or second balloon limiter between a rest position and an actuated position or between respective positions and intermediate positions existing between said positions. It is particularly advantageous to have a lead screw.

Additionally or alternatively, instead of or in addition to movement of the first and/or second balloon limiters, the spinning sleeve is moved during the unwinding procedure to move the first and/or second balloon limiters during the unwinding procedure. It is also conceivable to move the spinning sleeve relative to the second balloon limiter. A corresponding similar drive is provided to enable this movement.

It is further advantageous if the first balloon limiter is provided with closed, preferably circular or polygonal thread guiding surfaces, preferably at all positions. For example, the first balloon limiter is conceivable with a circular thread guide surface extending concentrically with the axis of rotation and preferably surrounding the spinning sleeve over its entire duration in the operating position of the first balloon limiter. The thread guiding surface of the first balloon limiter should enclose the bobbin in the unwinding position at the start of the unwinding procedure, especially in the region of the cylindrical portion of the thread body which is present on the spinning sleeve.

The second balloon limiter comprises two or more limiting elements, which assume a first position at least in the working position of the second balloon limiter or during said period, thereby closing the thread guiding surface. It is advantageous to form Each individual limiting element preferably comprises an arcuate thread guiding surface. It is furthermore advantageous if the limiting element surrounds the spinning sleeve in its working position or during the above-mentioned period like a pair of pliers, naturally without contact with the yarn body.

In the rest position of the second balloon limiter, the limiting element is such that the minimum distance A3 between the yarn guiding surface of the second balloon limiter and the axis of rotation of the spinning sleeve is the distance A2 (second (minimum distance between the yarn guiding surface of the balloon limiter and the axis of rotation of the spinning sleeve). This distance allows the empty spinning sleeve to be removed from the work station after the unwinding procedure while avoiding collisions between the second balloon limiter and the spinning sleeve. In contrast, the distance from the restricting element of the second balloon limiter to the spinning sleeve of the workstation of the second balloon limiter should be as small as possible to prevent excessive expansion of the yarn balloon. . The distance A2 should therefore lie between the radius of the cylindrical portion of the yarn body of the newly wound spinning sleeve and the radius of the empty spinning sleeve.

The distance A3 between the yarn guiding surface of the second balloon limiter in the rest position and the axis of rotation of the spinning sleeve is the distance between the yarn guiding surface of the first balloon limiter in the operating position and the axis of rotation of the spinning sleeve. It is particularly advantageous if the distance is greater than or equal to A1. Thus, it is fundamentally advantageous for the spatial limitation of the thread balloon if the distance between the thread body and the thread guiding surface of the first balloon limiter at the work station is as small as possible. The distance between the yarn guide surface of the second balloon limiter in the rest position and the axis of rotation of the spinning sleeve is as large as possible so that the empty spinning sleeve can be replaced without problems by a new wound spinning sleeve. should.

It is particularly very advantageous if A1 (minimum distance between the thread guide surface of the first balloon limiter and the axis of rotation of the spinning sleeve) has a size of 10 mm to 40 mm, preferably 18 mm to 25 mm. Said values ensure that the distance between the yarn body and the yarn guiding surface is as small as possible and the yarn balloon is as small as possible, depending on the dimensions of the yarn body on the spinning sleeve. The distance between said thread guiding surface and the thread body in the region of the cylindrical portion of the bobbin in the pay-out position is only 1 mm to 10 mm, preferably 1 mm to 5 mm.

It is further advantageous if A2 (minimum distance between the thread guide surface of the second balloon limiter in the working position and said axis of rotation) has a magnitude of 5 mm to 25 mm, preferably 8 to 16 mm. Said dimensions ensure that A2 is larger than the radius of the spinning sleeves normally used and smaller than the radius of the cylindrical portion of the yarn body of the bobbins produced on most ring spinning machines. Thus, while the first balloon limiter serves to limit the extent of the yarn balloon at the start of the unwinding procedure, the second balloon limiter serves primarily or exclusively to limit the yarn balloon. is after a certain unwinding time, i.e. after the radius of the thread body in the area of the second balloon limiter has become smaller than at the start of the unwinding procedure, or the top bobbin cone has moved sufficiently downward. , the first and second balloon limiters both surround the portion of the spinning sleeve free of yarn, during the unwinding procedure. The distance A2 is selected in particular to be smaller than the radius of the bobbin in the region of the cylindrical portion of the thread body of the bobbin, so that the diameter of the thread balloon formed will also be the same if the distance A2 is equal to or greater than said radius. small in comparison.

It is particularly advantageous if the size of A3 (minimum distance between the thread guide surface of the second balloon limiter in rest position and the axis of rotation of the spinning sleeve) is between 15 mm and 60 mm, preferably between 18 mm and 30 mm. When the second balloon limiter is in the rest position, replacing the empty spinning sleeve with a wound spinning sleeve while avoiding the risk of collision between the yarn body of the wound spinning sleeve and the second balloon limiter. can do.

A first balloon limiter and a second balloon limiter are supported on a common guide by a support and are movable relative to the guide, the first balloon limiter along the guide between an actuated position and a rest position. It is further advantageous if it is movable by The rest position of the first balloon limiter is preferably vertically above the actuated position. If the axis of rotation of the spinning sleeve in the payout position is oriented vertically, the first balloon limiter can be moved on the spinning sleeve from its rest position above the spinning sleeve by moving vertically. Thereby the first balloon limiter is preferably moved until it reaches the region of the cylindrical portion of the spinning sleeve. Preferably the guide is a linear guide. Preferably, the workstation further comprises a drive capable of moving the support along the guide.

A drive includes a first drive for moving the support along the guide, and the drive moves the limiting element of the second balloon limiter between its first and second positions. It is particularly advantageous if it includes a second drive for the movement. For example, the second balloon limiter can comprise two or more limiting elements that are relatively moveable by the second drive. This allows the second balloon limiter to move from its rest position to its active position. It is also conceivable for the second balloon limiter to start from a rest position on the spinning sleeve and first move to an intermediate position. Said intermediate position is taken when the first balloon limiter is moved to the operative position. Starting from said intermediate position, final movement of the limiting element causes the second balloon limiter to assume its final actuated position without moving the first balloon limiter.

It is further advantageous if the second drive is arranged on the support. In this case the second drive moves with the support. In this case, the second drive can be arranged spatially very close to the second balloon limiter, so that complex gearboxes or other power transmission elements are rarely required. The second drive can also be implemented as an electric, hydraulic or pneumatic drive. The use of one or more electromagnets is also conceivable, by means of which the limiting element of the second balloon limiter can be moved, for example against energy accumulation.

The invention further relates to a method of unwinding yarn from a bobbin containing a winding sleeve onto a winding sleeve.

First, the spinning sleeve, with the yarn body disposed thereon, is placed at a particular payout position in the work station of the winder. This can be done manually or automatically using corresponding transport devices.

Prior to the actual unwinding of the yarn on the winding sleeve present in the winding sleeve holder of the workstation, a first balloon limiter is positioned relative to the spinning sleeve so as to surround the spinning sleeve. This preferably moves the first balloon limiter from its rest position to its active position. Additionally or alternatively, it is also conceivable to move the spinning sleeve preferably perpendicular to the first balloon limiter. The minimum distance (A1) between the yarn guiding surface of the first balloon limiter after positioning and the axis of rotation of the spinning sleeve is greater than the radius of the bobbin in the area of the cylindrical portion of the yarn body present on the spinning sleeve. .

An unwinding procedure is then started, part of the yarn on the spinning sleeve is unwound on the winding sleeve, and any yarn defects are removed from the yarn in a typical manner.

on the basis of the determined trigger signal the second balloon limiter is positioned relative to the spinning sleeve and thereby moved, in particular from a rest position or an intermediate position between the rest position and the working position, into the working position; Said limiter surrounds the spinning sleeve. Additionally or alternatively, it is also conceivable to move the spinning sleeve preferably perpendicular to the second balloon limiter. The second balloon limiter surrounds the spinning sleeve after positioning, in particular after it has been moved into its operative position outside the cylindrical portion of the yarn body still remaining on the spinning sleeve, during positioning of this second balloon limiter. The unwinding process is not interrupted. It is particularly advantageous if during the unwinding process the axis of rotation of the spinning sleeve is in the vertical direction or at an angle of less than 45° to the vertical. In such cases, the second balloon limiter is preferably always arranged below the first balloon limiter.

It is particularly advantageous to position, in particular move, the second balloon limiter together with the first balloon limiter. Thus, when positioning the first balloon limiter relative to the spinning sleeve, for example moving it from its rest position to its working position, the second balloon limiter is simultaneously positioned relative to the spinning sleeve, in particular its rest position. position to an intermediate position. In contrast, when positioning the second balloon limiter, e.g. starting from its intermediate position or from a rest position and moving it into the working position, it is advantageous that the first balloon limiter is not positioned or moved. .

Furthermore, it is particularly advantageous if the first balloon limiter is positioned in less than 10 seconds, said limiter finally moving from the rest position to the working position and not until the end of the piecing process. Additionally or alternatively, when the second balloon limiter is positioned and moved, for example from its rest position to an intermediate position, this movement is similar to the movement of the first balloon limiter from its rest position to its actuation position. Advantageously, at the same time as And preferably, the second balloon limiter also moves specifically to its actuated position in less than 10 seconds and preferably stays there until the end of the unwinding process.

Furthermore, the minimum distance (A2) between the yarn guiding surface of the second balloon limiter and the axis of rotation of the spinning sleeve is smaller than the radius of the bobbin in the region of the cylindrical portion of the yarn body still remaining on the spinning sleeve. . Therefore, the second balloon limiter is preferably located above the cylindrical portion and performs a limitation of the yarn balloon that occurs during the unwinding process after a certain length of yarn has already been unwound. That is, the first balloon limiter acts on the thread balloon first in time, and then the second balloon limiter performs spatial restriction of the thread balloon after a certain unwinding time.

After the second balloon limiter has assumed its active position or has been positioned relative to the spinning sleeve, the yarn still remaining on the spinning sleeve is rewound onto the winding sleeve.

The trigger signal, ie the basis for positioning the second balloon limiter with respect to the spinning sleeve and thereby preferably moving it into its working position, is indicated below.
- the unwinding time from the start of the unwinding procedure or from the positioning of the first balloon limiter (e.g. take into account the stop time of the unwinding procedure due to thread breaks or clearer cuts);
- the height of the cylindrical part of the bobbin in the unwinding position parallel to the axis of rotation (preferably detectable by a sensor in the workstation);
- Yarn tension between spinning sleeve and winding sleeve (preferably detectable by a yarn tension sensor in the workstation)
- the diameter of the thread body at a defined position on the bobbin (preferably detectable by a corresponding sensor in the work station)
- the maximum diameter of the thread balloon (preferably detectable by a corresponding sensor in the workstation);
- the diameter of the thread balloon at a defined position (preferably detectable by a corresponding sensor in the workstation)

The indicated parameters can also include winding parameters (eg winding speed) or parameters of the spinning sleeve to be unwound (eg the diameter of the cylindrical portion or its height, the amount or length of the yarn).

The first balloon limiter and/or the second balloon limiter can also move rapidly (i.e. in less than 1 second) or gradually (longer time) from the rest position to the working position, or the spinning sleeve is positionable with respect to

The absolute position of the first balloon limiter and/or the second balloon limiter in the rest position and/or the actuated position can also be determined manually or by the workstation user. It is also conceivable that the workstation automatically determines one or more of said positions after the user has entered one or more data or winding conditions for rewinding the bobbin. The bobbin data includes, for example, the weight of the bobbin, or one or more bobbin dimensions, such as the height or diameter of the bobbin or the dimensions of the cylindrical portion of the bobbin.

The spatial position of the first balloon limiter remains unchanged until the end of the unwinding procedure, in particular after said limiter has been moved into the working position, and/or the spatial position of the second balloon limiter remains until the end of the unwinding procedure. , preferably unchanged after said limiter has been moved to its operating position.

The first balloon limiter preferably starts from its rest position, in particular above the spinning sleeve, and moves into its working position, preferably below the top bobbin cone. The second balloon limiter preferably has its operating position vertically below the operating position of the first balloon limiter. Preferably, the two balloon limiters are separated from each other by 10 mm to 120 mm in their respective actuated positions.

Furthermore, it is advantageous if the first balloon limiter is arranged on the bobbin parallel to the axis of rotation of the spinning sleeve when moving from the rest position to the working position. It preferably does not change the shape of the first balloon limiter.

Furthermore, it is very advantageous if the plurality of limiting elements of the second balloon limiter are moved, preferably pivoted, from the first position to the second position when the second balloon limiter is moved from its rest position to its working position. is. In this case, the shape of the balloon limiter (viewed as a whole) changes. The plurality of limiting elements can move towards each other, for example like pliers, when the second balloon limiter is moved to its operative position.

Further advantages of the invention are explained in the following embodiment examples. In outline, each

1 is a front view of a work station of a winder; FIG. Figure 2 shows a balloon limiter device according to the invention with the first and second balloon limiters in their rest positions; FIG. 3 is a first view showing the balloon limiter with the balloon limiter in different positions during the unwinding process. Figure 4 is a second view showing the balloon limiter with the balloon limiter in a different position during the unwinding process. Figure 5 is a third view showing the balloon limiter with the balloon limiter in a different position during the unwinding process. Figure 6 is a fourth view showing the balloon limiter with the balloon limiter in a different position during the unwinding process. FIG. 7 is a diagram showing details of the first balloon limiter. FIG. 8 shows details of an alternative embodiment of the first balloon limiter; FIG. 9 shows details of the second balloon limiter in the activated position; Figure 10 is a detail of the second balloon limiter of Figure 9 in a rest position;

In the following description of the figures, the same reference numbers are used for the same or at least equivalent features in the various figures. Individual features, or their embodiments and/or modes of operation, are typically described in detail only the first time they are mentioned. If individual features are not again described in detail, their design and/or functioning corresponds to the design and functioning of the preceding features.

Furthermore, it should be noted that the following embodiment examples show variations in which the first balloon limiter 6 and the second balloon limiter 7 are moved relative to the spinning sleeve 3 . Naturally, additionally or alternatively, it is also conceivable for the spinning sleeve 3 to move relative to the first balloon limiter 6 and/or the second balloon limiter 7 . A corresponding and similar drive is provided to allow the spinning sleeve 3 to move.

FIG. 1 shows a workstation according to the winder invention, but not in its entirety, only the workstation base support 14 on which the individual components are mounted. The work station holds the yarn 1, for example from a spinning sleeve 3 supplied from a ring spinning machine, in a bobbin holder, not shown in detail, and during the unwinding procedure it is rotated in a known manner by the drive unit of the work station. It has the function of unwinding onto the winding sleeve 4 which is guided. In the illustrated example, the yarn running direction G extends from bottom to top. The spinning sleeve 3 and the thread body 17 thereon (collectively referred to as the bobbin 15) are fixed by a bobbin support 27 in the area of the unwinding position 2 during the unwinding procedure. Since the spinning sleeves 3 can only accept a relatively small amount of yarn 1 , the yarns 1 from several spinning sleeves 3 are successively wound onto the winding sleeve 4 . The work station in the example shown comprises a splicer 23 for splicing the yarns 1 of a plurality of spinning sleeves 3, which is also used for clearer cutting.

The workstation further comprises a balloon restrictor 25 (described in detail below), a first pivoting suction tube 21 and a second pivoting suction tube 22 . The swiveling suction tubes 21, 22 have the function of locating and gripping the yarn end on the spinning sleeve 3 or winding sleeve 4 after a yarn breakage, at the start of the unwinding procedure or during a clearer cut. A yarn sensor 26 known per se is also provided for detecting yarn defects. The work station further comprises a grooved roller 20 (or driven traverse roller 20) which on the one hand drives the winding sleeve 4 and on the other hand serves to oscillate the yarn 1 in the area of the winding sleeve 4 during the unwinding process. thread guide).

Finally, the illustrated work station includes a thread guide 19 (e.g. eye-shaped) for guiding the thread 1 behind the balloon restrictor 25 and a thread guide 19 for controlling thread tension during the unwinding process. A tensioner 24 is provided.

One possible embodiment of a balloon restriction device 25 according to the invention is shown in Figures 1-6.

Said device mainly comprises a first balloon limiter 6 and a second balloon limiter 7, which move from their corresponding rest positions to their working positions at different times.

As shown in FIG. 2, the spinning sleeve 3 basically has an axis of rotation 9 which extends in particular vertically. In this case, the yarn running direction G also extends vertically. The bobbin 15 mainly comprises said spinning sleeve 3 and a thread body 17 wound thereon, the thread body 17 typically comprising a cylindrical portion 16 and two bobbin cones 28 (for clarity, 2, indicated by a single reference number).

In FIG. 2 both the first balloon limiter 6 and the second balloon limiter 7 are in their respective rest positions. In said position the bobbin 15 can be placed in the payout position 2 shown in FIG. 2 while avoiding the risk of collision with the two balloon limiters 6,7.

In the next step the first balloon limiter 6 is moved to the workstation shown in FIG. 3, where said limiter completely wraps around the cylindrical portion 16 of the thread body 17 . This also causes the second balloon limiter 7 to move and assume the intermediate position shown in FIG. The first balloon limiter 6 is preferably in its operative position in the upper third or at least the upper half of the cylindrical portion 16 of the thread body 17 . The second balloon limiter 7 is preferably arranged below the first balloon limiter 6 at every position.

It is particularly advantageous if the first balloon limiter 6 and the second balloon limiter 7 are mounted on a common support 10 which is moved along a guide 11 by means of a first drive 12, as shown in FIG. is. The first drive 12 is shown only schematically in FIG.

While or after the first balloon limiter 6 assumes the actuated position, the unwinding procedure is initiated by rotating the winding sleeve 4 by means of a corresponding drive. The yarn 1 is thereby unwound from the spinning sleeve 3 . As can be seen in FIG. 3, centrifugal force acts on the thread 1 by letting out the thread 1, so that a thread balloon 5 is formed between the thread body 17 and the thread guide 19 arranged thereon. At the start of the unwinding process, said centrifugal force is still relatively small, since the distance between the thread guide 19 and the point at which the thread 1 unwinds from the thread body 17 is still relatively small. However, during the course of the unwinding process, the top bobbin cone 28 moves downwards continuously or in steps (compare, for example, FIG. 3 with FIG. 6 showing the bobbin 15 near the end of the unwinding process).

FIG. 4 shows bobbin 15 and balloon restrictor 25 at a point after FIG. As can be seen from this figure, the upper portion of the yarn body 17 has already been unwound from the spinning sleeve 3, so the position at which the yarn 1 is unwound from the yarn body 17 is lower than in FIG. The yarn guiding surface 8 of the first balloon limiter 6 contacts the yarn end at this point to limit the spatial extent of the yarn balloon 5 , thereby causing the yarn balloon 5 to move around the spinning sleeve 3 . , limits the centrifugal force acting on thread 1 and its eventual resulting thread tension.

For example, as shown in FIG. 5, when the top bobbin cone 28 reaches a particular position, the second balloon limiter 7 moves quickly or gradually from said intermediate position to its working position. At this point, the spatial extent of the thread balloon 5 is limited spatially by the second balloon limiter 7 alone or, depending on the position of the bobbin cone 28, by both balloon limiters 6,7.

During the further unwinding process, the top bobbin cone 28 moves further downwards and after a certain point only the thread guiding surface 8 of the second balloon limiter 7 contacts the thread 1 and limits the thread balloon 5 alone. I do. FIG. 6 shows the situation at this time.

At the latest, by the time the entire yarn 1 has been unwound from the spinning sleeve 3 onto the winding sleeve 4, the two balloon limiters 6, 7 are returned to their rest positions and the empty spinning sleeve 3 is replaced with a new bobbin 15. be.

FIG. 7 is a top view of a portion of the first balloon limiter 6. FIG. As can be seen from this figure, it is advantageous if the minimum distance A1 between the thread guide surfaces 8 of the first balloon limiter 6 in contact with the thread 1 is greater than the radius R of the bobbin 15 in the area of the cylindrical portion 16 of the bobbin 15. is. This allows the first balloon limiter 6 to move onto the bobbin 15 from above.

FIG. 7 further shows that the thread guiding surface 8 of the first balloon limiter 6 is preferably circular and closed by design. Of course, it is also possible for the thread guide surface to have a different shape, for example the polygon shown in FIG. It is also not necessary for the thread guide surface 8 to be completely closed on the outside.

In contrast to the first balloon limiter 6, the minimum distance A2 between the yarn guiding surface 8 of the second balloon limiter 7 and the axis of rotation 9 of the spinning sleeve 3 when the second balloon limiter 7 is in the operating position is Advantageously, it is smaller than the radius R of the bobbin 15 in the region of the cylindrical portion 16 of the bobbin 15 . As a result, the distance between the yarn guide surface 8 and the spinning sleeve 3 is smaller than with the first balloon limiter 6 . This finally ensures that from the moment the second balloon limiter 7 assumes its operating position, the thread balloon 5 is spatially limited as closely as possible.

2-6, 9 and 10 further illustrate that the second balloon limiter 7 has two relatively movable positions for the purpose of allowing the second balloon limiter 7 to move between a rest position and an actuated position. It has been shown to be advantageous to have the limiting element 18 described above. As shown schematically in FIG. 2, the two limiting elements 18 are preferably movable by means of a second drive 13 of the workstation. A second drive 13 can also be arranged, for example, on the support 10 and can be moved together with the support 10 .

FIG. 10 shows one of the possible positions of the two limiting elements of the second balloon limiter 7 in its rest position. The minimum distance A3 between the yarn guiding surface 8 of the second balloon limiter 7 and the axis of rotation 9 of the spinning sleeve 3 in the current position is greater than the corresponding distance A2 in the working position of the second balloon limiter 7. . This allows the bobbin 15 to move to the feeding position 2 without collision before the unwinding process.

The invention is not limited to the illustrated and described embodiment examples. Modifications within the scope of the claims are possible and any combination of the described features will also form an independent claim, even if the aforementioned features appear in different parts of the specification or claims or in different embodiments. Yes, as long as the section does not contradict the teachings.

1 yarn 2 delivery position 3 spinning sleeve 4 winding sleeve 5 yarn balloon 6 first balloon limiter 7 second balloon limiter 8 yarn guide surface 9 rotating shaft 10 support 11 guide 12 first driver 13 second drive Body 14 Base support 15 Bobbin 16 Cylindrical portion 17 of the yarn body on the spinning sleeve Yarn body 18 Limiting element 19 Yarn guide 20 Grooved roller 21 First orbital suction tube 22 Second orbital suction tube 23 Splicer 24 Yarn tensioner 25 Balloon limiting device 26 Yarn sensor 27 Bobbin holder 28 Bobbin cone A1 Minimum distance A2 between the yarn guiding surface of the first balloon limiter and the axis of rotation of the spinning sleeve Minimum distance A3 between the axis of rotation Minimum distance G between the yarn guiding surface of the second balloon limiter in rest position and the axis of rotation of the spinning sleeve G Yarn running direction R Bobbin radius

Claims (17)

A work station of a winder for unwinding a yarn (1) from a spinning sleeve (3) located at a pay-out position (2) of the work station onto a take-up sleeve (4), comprising:
Said work station comprises a balloon limiting device (25) for spatially limiting the yarn balloon (5) formed between said spinning sleeve (3) and said winding sleeve (4) during the unwinding procedure. prepared,
said balloon limiter (25) comprises a first balloon limiter (6) and a second balloon limiter (7);
said first balloon limiter (6) is arranged downstream of said second balloon limiter (7) in a particular yarn travel direction (G);
When said work station is in operation, said first balloon limiter (6) and said second balloon limiter (7) each keep at least one thread at least for a certain period of time during said unwinding procedure. a guide surface (8), said yarn guide surface (8) surrounding said spinning sleeve (3) in said payout position (2), said yarn guide surface (8) of said first balloon limiter (6) and the axis of rotation (9) of said spinning sleeve (3) is, at least during said period, between the yarn guiding surface (8) of said second balloon limiter (7) and said axis of rotation (9 ) is greater than the minimum distance A2 between the Said first balloon limiter (6) and said second balloon limiter (7) are each in an actuated position in which they remain at least for some time during said unwinding procedure and an empty spinning sleeve (3) after completion of said unwinding procedure. ) and a rest position in which the spinning sleeve (3) wound with yarn can be exchanged. Said workstation moves said first balloon limiter (6) and said second balloon limiter (7) independently of each other and/or together between said corresponding actuated and rest positions. 3. A workstation according to claim 1 or 2, comprising a drive for enabling 4. The first balloon limiter (6) according to any one of claims 1 to 3, characterized in that said first balloon limiter (6) is provided in all positions with a closed, preferably circular or polygonal thread guiding surface (8). workstation. Said second balloon limiter (7) comprises two or more limiting elements (18), said limiting elements (18) having a first position at least in the operating position of said second balloon limiter (7). , thereby forming a closed thread guide surface (8), said limiting element (18), in the rest position of said second balloon limiter (7), the thread of said second balloon limiter (7) Claims 1 to 4, characterized in that it assumes a second position in which the minimum distance A3 between the guide surface (8) and the axis of rotation (9) of the spinning sleeve (3) is greater than the distance A2. A workstation according to any one of A workstation according to any one of claims 1 to 5, wherein said distance A3 is greater than or equal to said distance A1. Workstation according to any one of the preceding claims, characterized in that the size of A1 is between 10 mm and 40 mm, preferably between 18 mm and 25 mm. A work station according to any one of the preceding claims, characterized in that the size of A2 is between 5 mm and 25 mm, preferably between 8 mm and 16 mm. Workstation according to any one of the preceding claims, characterized in that the size of A3 is between 15 mm and 60 mm, preferably between 18 mm and 30 mm. said first balloon limiter (6) and said second balloon limiter (7) being supported on a common guide (11) by a support (10) and displaceable relative to said guide (11); 10. The first balloon limiter (6) according to any one of claims 1 to 9, characterized in that said first balloon limiter (6) can be moved between its working and rest positions by moving along said guide (11). workstation as described in . Said drive comprises a first drive (12) for displacing said support (10) along said guide (11), said drive for displacing said second balloon limiter (7). 11. The device according to any one of claims 1 to 10, characterized in that it comprises a second drive (13) for moving the limiting element (18) between said first and second positions. Work station. Workstation according to any one of the preceding claims, characterized in that the second drive (13) is arranged on a support (10). A method for unwinding a yarn (1) from a bobbin (15) containing a spinning sleeve (3) onto a take-up sleeve (4), comprising at least
positioning said spinning sleeve (3) at a particular unwinding position (2) of a winder work station,
positioning a first balloon limiter (6) with respect to said spinning sleeve (3) such that said first balloon limiter (6) surrounds said spinning sleeve (3), said first balloon limiter The minimum distance A1 between the yarn guide surface (8) of (6) and the rotation axis (9) of the spinning sleeve (3) is the cylindrical shape of the yarn body (17) present on the spinning sleeve (3) a step greater than the radius (R) of the bobbin (15) in the region of the portion (16);
winding a portion of the yarn (1) present on said spinning sleeve (3) onto said winding sleeve (4);
positioning a second balloon limiter (7) with respect to said spinning sleeve (3) such that said second balloon limiter (7) surrounds said spinning sleeve (3), said second balloon limiter (7) surrounds said spinning sleeve (3) outside said cylindrical portion (16) of said yarn body (17) remaining on said spinning sleeve (3), said second balloon limiter (7) The minimum distance A2 between the yarn guiding surface (8) and the axis of rotation (9) of said spinning sleeve (3) is such that said cylindrical portion of said yarn body (17) remaining on said spinning sleeve (3) 16) smaller than the radius (R) of said bobbin (15) and rewinding the yarn (1) remaining on said spinning sleeve (3) onto said winding sleeve (4),
method including. Positioning of said first balloon limiter (6) relative to said spinning sleeve (3) moves said first balloon limiter (6) from a rest position to an active position and/or said spinning sleeve ( 14. Method according to claim 13, characterized in that the positioning of the second balloon limiter (7) with respect to 3) moves the second balloon limiter (7) from the rest position to the working position. After said first balloon limiter (6) has moved to its working position, the spatial position of said first balloon limiter (6) remains unchanged until said unwinding procedure is terminated and/or said second 15. characterized in that after the second balloon limiter (7) has been moved into its working position, the spatial position of said second balloon limiter (7) remains unchanged until said unwinding procedure is terminated. The method described in . Said first balloon limiter (6) is characterized in that it moves from a rest position to an active position and is placed on said bobbin (15) parallel to the axis of rotation (9) of said spinning sleeve (3). The method according to any one of claims 13 to 15. a plurality of limiting elements (18) of said second balloon limiter (7) move from a first position to a second position when said second balloon limiter (7) moves from a rest position to an actuated position; Method according to any one of claims 13 to 16, characterized in that it is preferably pivoted.

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