CZ2004651A3 - Method of servicing textile machine workstation as well as the textile machine itself and a kit for textile machine additional outfit - Google Patents

Abstract

The invention provides a method for maintaining the working position on a textile machine, which is characterized in that a yarn is transmitted to a winding device and then is caught and transmitted to a yarn cutting device for cutting off through the winding device; and the yarn is strained on a cutting edge and is cut off through a relative motion along the cutting edge. The invention also provides a textile machine, which is provided with a plurality of same working positions. The invention is characterized in that a winding device (4) is arranged at each working position for winding the provided yarn (F); the textile machine comprises a maintenance device capable of moving along the working positions; a yarn leading-in device (21) and a yarn leading-out device (20) are arranged for transmitting the yarn; a rotatable yarn catching device (47) is arranged for receiving and straining the transmitted yarn (F) and making the yarn drop; the yarn cutting device (6), which is fixed relative to the yarn catching device (47), is arranged and is provided with at least a cutting edge (600) for cutting off the strained and dropped yarn (F); and wherein the yarn cutting device (6) is used for enabling the yarn to perform the relative motion along the cutting edge (600). The invention also provides a refitted spare part, which can be used on the textile machine.

Description

Technical field

The invention relates to a method of operating a workstation on a textile machine, in which the yarn is presented to a winding device, thereby being caught and guided to a yarn cutting device for cutting. The invention further relates to a textile machine having a plurality of similar workplaces having a winding device for winding in the fed-in yarn, with a service device movable along the workplaces having a yarn feeding device and a yarn delivery device for producing a yarn with a rotating device and a yarn cutting device that is stationary to the yarn catching device with at least one cutting edge to cut the tensioned and stored yarn as well as the retrofit kit for a similar textile machine.

BACKGROUND OF THE INVENTION

It is known from DE 196 44 593 A1 that when the bobbins are changed after insertion and re-drive of the empty tube, the yarn is presented to the catching device by means of a yarn feeding device and a yarn removal device which rotates with the empty tube. After the yarn catcher has caught the yarn, it feeds it to the yarn cutting device to cut the yarn between the winding device and the yarn removal device. To this end, the yarn cutting device comprises a V-shaped cutting edge through which the yarn is tensioned due to the rotation of the gripping device and the retention force of the yarn removal device. In this case, the yarn abuts in a customary manner on the cutting edge at a certain point of the arm V, which faces the gripping device. This arm V is disposed relative to the axis of rotation of the empty tube in an inclined position so that the yarn is pulled along the yarn cutting edge during the cutting process and confidently reaches the top V where the cutting process is already started

terminated by a sudden increase in pressure. In a similar arrangement, the yarn is only weakened by movement along the cutting edge and finally torn off by its longitudinal tension. At the time of cutting, there is no relative movement of the yarn along the cutting edge.

However, especially in the case of coarse and strong yarns, as well as in the case of a dirty or worn cutting edge, the cutting process may not succeed. The components contained in the yarn settle over time at the top of the V-shaped cutting edge, which causes a possible failure in cutting the yarn. Then, after the service device has been removed from the operating position after completion of its service work, a continuously extending piece of yarn corresponding to the path made by the service device is withdrawn from the yarn removal device. These loosened yarns can interfere, inter alia, with several adjacent workstations and, in the present case, can be wound into adjacent bobbins, leading to disturbances due to a disturbed bobbin winding process at the latest during further processing.

Similar textile machines which exhibit V-shaped yarn cutting devices for cutting the yarn are nowadays operated in large quantities and are only slowly replaced because of their long durability and cost.

It is therefore an object of the present invention to provide a method and a textile machine by means of which the above-described disadvantages can be avoided. In addition, an retrofit kit is provided which can be used in a simple manner and at a low cost and which allows the method of the invention to be used in existing textile machines.

SUMMARY OF THE INVENTION

The task is solved by a method, a textile machine as well as a retrofit kit with the features of the independent claims.

In the method of the invention, the yarn is presented to a winding device, thereby being caught and fed to the yarn cutting device for cutting. To this end, the yarn is stretched across the cutting edge and moved relative movement along the edge. The yarn is thereby cut during continuous relative movement. In this way, the yarn is cut in the true sense of the word and not wiped or torn as it has been until now, thereby achieving greater reliability in cutting.

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The required relative movement can be caused by moving the cutting edge across the yarn. In principle, all known drives are suitable for this purpose.

Relative movement can also be developed in that the yarn is moved along the cutting edge by a movable guide device. Any guide means such as hooks or eyelets that can be moved by any known drive can be used here.

In a particularly advantageous manner, the relative movement can be caused by the yarn being tensioned laterally by a cutting edge extending across the longitudinal direction of the yarn, the movement relative to the cutting edge being performed by a normal and parallel component and the yarn being pulled by its transverse component cutting edge. Thus, relative movement can be induced without any expensive drive.

If the yarn is subsequently drawn in its longitudinal direction over the cutting edge, a planing effect occurs, which further increases the reliability of the cut.

This effect can be increased when the yarn is pulled over the cutting edge in such a way that the angle between the half-line extending from the point of contact extending perpendicular to the cutting edge as well as in the cutting edge defining surface pointing upstream and between the straight line the yarn was greater than 90 degrees.

The yarn may be pulled over the cutting edge in such a way that the yarn directional inlet and outlet vectors have a parallel component to the cutting edge and that the yarn is pushed in the direction of the parallel component along the cutting edge. In this way, a relative movement sufficient to cut the yarn is developed in a simple manner.

In order to further increase the reliability in cutting, the yarn can be tensioned over a plurality of cutting edges which are arranged at least partially parallel and / or at least partially oblique relative to each other.

In another embodiment of the method of the invention, a rotating cutting edge may be used to cut the yarn.

It is also advantageous when the yarn is moved to cut through a cutting edge which has a "continuous line" in its working section. Working ► ► »» | The section of the cutting edge is the section that comes into contact with the yarn during the cutting process. The term “continuous” is to be understood in the mathematical sense; the continuous cutting edge has no breaks or discontinuities in the working section. This avoids excessive and persistent dirt build-up, which usually occurs over time at exposed locations of the cutting edge working portion, and can also increase the degree of reliability when cutting.

By moving the yarn F over a cutting edge which has a straight cutting edge or a blade that is outwardly arched in its working portion, the failure of the cutting process caused by contamination of the cutting edge can be prevented in particular.

In the type of textile machine according to the invention, the yarn cutting device is designed to effect relative movement of the yarn along at least one cutting edge. This ensures reliable cutting of the yarn.

For this purpose, a yarn cutting device can be provided for moving the cutting edge in its longitudinal direction.

The yarn cutting device may alternatively or additionally comprise a yarn guiding device that moves across the yarn.

The cutting edge may be arranged transverse to the longitudinal direction and obliquely to the movement of the yarn support, thereby forcing the yarn to slide along the cutting edge. By the insertion movement is meant here a movement across the longitudinal direction of the yarn by which the yarn is tensioned across the cutting edge.

The yarn cutting device may additionally be arranged in relation to the tensioned yarn in such a way that the angle between the half-line extending from the point of contact extending at right angles to the cutting edge and in the cutting edge defining surface facing away from the yarn catching device , was greater than 90 °. If the yarn is now pulled over the cutting edge in its longitudinal direction, this results in a planing effect which further increases the reliability of the cut.

The cutting edge may further be arranged in such a way that the tensioned yarn direction vectors have a parallel component to the cutting edge. In this case, if the yarn is drawn in its longitudinal direction over the cutting edge, this leads to the yarn being pushed out in the direction of the parallel component and thus to the desired relative movement.

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In order to further increase the reliability in cutting, the yarn cutting device may have a plurality of cutting edges which are arranged at least partially parallel to each other and / or at least obliquely.

The yarn cutting device may have at least one rotating cutting edge. For example, the cutting edge may have a circular or oval blade and a centric or eccentric axis of rotation. In this way, relative movement is also possible at high speed between the yarn and the cutting edge.

The at least one cutting edge may further comprise a serrated blade.

It is also advantageous if the cutting edge has a continuous course in its working section. The cutting edge working section is an area which comes into contact with the yarn during the cutting process. The term “continuous” is to be understood in the mathematical sense; the continuous cutting edge has no breaks or discontinuities in the working section. This avoids excessive and persistent dirt build-up, which usually occurs over time, at exposed locations of the cutting edge working portion, and can also increase the degree of reliability when cutting.

In particular, soiling can be prevented in such a way that the cutting edge has a straight cutting edge or an outwardly curved cutting edge in its working section.

The at least one cutting edge (60) may advantageously have at least one V-shaped cutting edge (600) and the apex of the V-shaped cutting edge (600) may be arranged outside the working portion of the cutting edge. Such a blade can be manufactured and assembled in a simple manner and is characterized by a compact design.

With the retrofit kit according to the invention, the equipment of a conventional textile machine can be easily changed to carry out the described method with the stated advantages. If desired, the retrofit kit may also include an adapter for mounting the yarn cutting device on the textile machine. It can also be used as a repair kit for a textile machine according to the invention.

The invention can be applied to various textile machines in which it is necessary to pass a running yarn for winding into an empty tube, for example a winding machine or an open-end spinning machine.

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Overview of the drawings

Further advantages are explained in the following exemplary embodiments, which are shown in the drawings, wherein FIG. 1 is a perspective view of an essential component of an open-end spinning machine; FIG. 2 is a perspective view of a spool arm with a conventional yarn cutting device; Fig. 3b, 3c a conventional front, side and top view of the conventional blade; Fig. 4 a perspective view of a bobbin arm with a yarn cutting device according to the invention; Figs. 5a, 5b, 5c according to the invention in front view, side and top view; FIGS. 6a, 6b are side and front views of another embodiment of the invention; and FIG. 7 is another exemplary embodiment.

DETAILED DESCRIPTION OF THE INVENTION

Giant. 1 shows a workstation of an open-end spinning machine with an open-end spinning device 1, which has a discharge nozzle 10, which can be pulled from the open-end spinning device 1 by pulling rollers 11,12 to feed it to the winding device 4. and 41, which are rotatably mounted on an axis 42, between which an empty tube 11 can be inserted by means of two plates 400 and 410 which are rotatably mounted in the spool arms 40 and 41, the yarn to be wound on the empty tube. In this case, one of the plates 400, 410, in the exemplary embodiment of the plate 400, is designed as a gripping device 47 and has for this purpose a plurality of gripping hooks 470.

The yarn feeding device 2 is used to present the yarn F with the catching device 47. This has a yarn removal device, which in the exemplary embodiment is designed as a suction nozzle 20 where vacuum can be applied, and a yarn feeding device 21 arranged on a common holder 22. The yarn delivery device 2 is mounted on a service device (here (not shown) in such a way that it can be brought to work with the gripping device 47 for the purpose of carrying out the work and subsequently brought into the rest position within the service device. The service device is typically installed to perform various service tasks and travels along a plurality of the same workstations, which are arranged side by side.

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In the region of the mouth of the suction nozzle 20 there is a yarn retention device 8 for tensioning the yarn in cooperation with the catching device 47. This can be designed, for example, as an electromechanically lowered clamping device 82 and can be arranged inside the clamping device 84.

To drive the empty tube H in the direction of the arrow fe and later for the forming spool (not shown), the winding roller 43 is driven in the direction of the arrow fi, upstream of the guide rod 44 with one yarn guide 45, which is designed as a self-threading device. to one winding device 4 in order to be able to catch the yarn F, after it has been transferred to the empty tube 11 and, during distribution, is placed to form a bobbin.

On the spool arm 40 carrying the saucer 400 with the gripping device 47, a yarn cutting device 6 is provided that is fixed relative to the rotating gripping device 47. In the illustrated embodiment, the yarn cutting device 6 has a cutting edge 60 with a cutting edge 600 of yarn. which is arranged between the catching device 47 and the coil arm 40 (covered in the coil arm 40 in FIG. 1). The blade 60 is deflected outside the working section of the yarn cutting edge 600 at right angles and thus has a fastening section 601 by means of which the blade 60 is fixed below the intermediate portion of the spacer 61 on the spool arm 40.

Giant. 2 shows a spool arm 40 with a yarn cutting device 6, which conventionally has a blade 60 with a V-shaped cutting edge 600, wherein the axis of the arm angle V extends substantially parallel to the spool arm 40. In this known arrangement, the yarn is fitted by the yarn 47 to the bearing point P, which is located roughly in the bottom V (standing on the head) and is pulled over the cutting edge by its rotation. In cooperation with the suction nozzle 20 and the yarn retention device 8, the yarn F is guided in the tensioned state to the base V and there it is cut at the cutting edge 600 by friction or friction. bursting.

The intended positioning at one point, which is at a greater distance from the top V on the legs V, is practically not possible with similar geometry, since with a normal opening size of V a few millimeters there is a danger that the yarn will lie completely next to the cutting edge 600. it should also be noted that the lateral movement for receiving the yarn F is subject to a certain spatial tolerance, since the yarn gripping position F is subject to both the yarn retaining device 8 and the catching device 47 *.

some fluctuation. The intended bearing point P must therefore be planned at a certain safe distance S from the outer delimitation of the cutting edge 600.

The magnification V is not possible due to the arrangement between the spool arm 40 and the yarn catching device 47. This also makes it impossible to cut the yarn F by sliding along the cutting edge and under unfavorable conditions, especially in the case of a worn and / or soiled cutting edge 600 and / or in the case of a coarse and / or solid yarn F F. If the operator device is now removed from the work station without the yarn F being cut, the yarn is pulled from the suction nozzle 20 and the yarn 20, respectively. from the yarn retaining device 8 and is guided upstream of the adjacent or more distant work station. This can cause immediate or later malfunctions.

Giant. 3a, 3b and 3c show a conventional blade in front view, side view and top view. The blade 60 has a V-shaped cutting edge 600 as well as a fastening section 601 which is arranged at right angles. By means of the fastening hole 605, in this case by engaging a spacer 61 and a fastening means (not shown), for example a screw, the blade 60 can be placed on the spool arm 40 as shown in FIG. 2. The working edge of the cutting edge 600 extends from The section along the blade 600 which travels the yarn F is relatively short and is generally at most sufficient to weaken but not cut the yarn. The shaped edge 600 thus formed is very prone to contamination, since in particular the sliver particles can easily settle in the region of the apex V. During operation, the dirt layer "grows" along the arm V, which prevents the yarn F from cutting sooner or later.

Giant. 4 shows a spool arm 40 with a yarn cutting device 6 according to the invention. The yarn F, which extends between the suction nozzle 20 and the gripping device 47 in a substantially rectilinear manner and in the orthogonal plane of the axis of rotation of the gripping device 47, is supported by rotation of the gripping device 47. and in conjunction with the suction nozzle 20, respectively. the yarn retaining device 8 is tensioned over this cutting edge 600. Since the cutting edge 600 of the cutting edge 60 is arranged obliquely in the working section to move the yarn support F, the yarn F is forced out by its longitudinal tension along the cutting edge 600 in the direction of the spool arm 40. By prolonged sliding, the yarn F is cut in its own sense. greatly increases the reliability of interruptions. In the working section, the cutting edge 600 exhibits a rectilinear course, thereby avoiding or at least substantially reducing the deposit of dirt.

Giant. 5a, 5b and 5c show the cutting edge 60 for the arrangement of FIG. 4 on the spool arm 40 in front view, side view and top view. The cutting edge 60 has a V-shaped cutting edge 600 as well as a fastening section 601 which is arranged at a right angle, wherein the V is flat in relation to the fastening section. The yarn F is mounted and tensioned in a plane that extends substantially parallel to the fastening section 601. It is thereby forced forced from the bearing point P to the spool arm 40 and cut. In the case of an unchanged safety distance S, the working section of the cutting edge 600 or the possible sliding path of the yarn F relative to the conventional arrangement shown in FIGS. 2 and 3a to 3c is considerably extended. The yarn can be cut reliably and safely by an extended cutting movement. The base V is displaced relative to the conventional embodiment to the fastening section 601 so that in the mounted state the blade 60 on the spool arm 40 is covered by the spool arm 40. Thus, the cutting edge 600 obtains a continuous and rectilinear course in its working section and is not dirt-sensitive. The outer dimensions of the blade 60 and the fastening section 601 with the fastening hole 605 are in accordance with a conventional embodiment. Thus, the blade 60, in this case by the inclusion of a spacer 61 and a fastening means (not shown), for example a screw, can be mounted on the spool arm 40 of a conventional textile machine.

The blade shown in FIGS. 5a, 5b and 5c is suitable for a simple, inexpensive application of the method of the invention to any textile machine in which the fed yarn F is to be wound on a tube H. The blade 60 may in particular be included in an retrofit kit for to modernize conventional textile machines, since the blade (60) can be positioned in the conventional manner on the spool arm (40). If necessary, a blade adapter on the spool arm can also be provided.

Giant. 6a shows a further preferred embodiment of the invention in side view. Here, the blade 60 is arranged relative to the tensioned yarn F in such a way that the angle α between the tangent line HG which extends from the point of contact and which runs perpendicular to the cutting edge 600 and within the boundary surface 602 of the cutting edge 600 , and between the yarn feed line F, was greater than 90 °. If the yarn F is now pulled in the direction of the arrow LR, an additional planing effect is created which further increases the cut reliability. Giant. 6b shows the position of the half-line HG in the spacer surface 602. It has its origin at the point of contact of the yarn F with the cutting edge 600 and extends at right angles to this cutting edge 600.

Giant. 7 shows another embodiment in a top view. The cutting edge 600 of the blade 60 is arranged in such a way that the tensioned yarn direction vectors F and in the direction of the arrow LR have a component parallel to the cutting edge 600, with the inlet and outlet sections of the yarn F not visible in this view. since the yarn F is stretched V-shaped across the entire cutting edge 600. By the parallel component, the moving yarn F is pushed in the direction of the arrow AR. The yarn F, which moves along the cutting edge 600, is now cut by the cutting movement.

The invention is not limited to the illustrated embodiments. For example, combinations of the characters are possible.

Claims (26)

Patent claims A method for operating a workstation on a textile machine, wherein the yarn is presented to a winding device, thereby being caught and fed to the yarn cutting device for cutting, characterized in that the yarn is tensioned over at least one cutting edge and cut by relative moving along the cutting edge. Method according to claim 1, characterized in that the relative movement is in part caused by at least the cutting edge being moved across the yarn. Method according to claim 1 or 2, characterized in that the relative movement is in part caused by at least the yarn being moved by the movable guide device along the cutting edge. Method according to one of claims 1 to 3, characterized in that the relative movement is in part caused by at least the yarn being tensioned laterally by a cutting edge extending transversely to the longitudinal direction of the yarn, the movement being performed relative to the normal cutting edge. and the parallel component and the yarn is pulled along the cutting edge by the parallel component of the thrust force. Method according to one of Claims 1 to 4, characterized in that the yarn is drawn in its longitudinal direction over the cutting edge. Method according to claim 5, characterized in that the yarn is pulled over the cutting edge in such a way that the angle between the half-line extending from the point of contact extending at right angles to the cutting edge and in the cutting edge defining surface , and between the yarn feed line was greater than 90 °. Method according to one of claims 5 or 6, characterized in that the relative movement is in part caused by at least that the yarn is pulled over the cutting edge in such a way that the yarn direction feeding and withdrawing yarn vectors have a component parallel to the cutting edge and the yarn is extruded in the direction of the parallel component along the cutting edge. Method according to one of Claims 1 to 7, characterized in that the yarn is tensioned over at least two parallel cutting edges. ·· 4943 «9 49 9 9 9 · 9 9 9 9 • 9 9 9994 9 9 09 9 ·· 90 • 9 0 • 99 • 4 • 9 9 ··· 94 9 9 4 99 949 Method according to one of Claims 1 to 8, characterized in that the yarn is tensioned over at least two non-running cutting edges. Method according to one of Claims 1 to 9, characterized in that the yarn is cut through at least one rotating cutting edge. Method according to one of Claims 1 to 10, characterized in that the yarn is cut through at least one cutting edge with one continuous running section. Method according to one of Claims 1 to 11, characterized in that the yarn is cut by at least one cutting edge with one straight or convexly extending working section. A textile machine having a plurality of homogeneous workplaces having a winding device (4) for winding the fed yarn (F), with an operator device that travels along the workplaces shown by the yarn feeding device (21) and the device (20) a yarn take-up for spinning, with a rotating yarn catching device (47) for catching, tensioning and storing the present yarn (F) as well as with a yarn cutting device (6) which is immovable relative to the device (47) for collecting the yarn, with at least one cutting edge (600) for cutting the tensioned and laid yarn (F), in particular for carrying out the method according to one of claims 1 to 10, characterized in that the yarn cutting device (6) is designed for performing a relative movement of the yarn (F) along at least one cutting edge (600). Textile machine according to claim 13, characterized in that the yarn cutting device (6) is designed to move the cutting edge (600) in its longitudinal direction. Textile machine according to claim 13 or 14, characterized in that the yarn cutting device (6) comprises a yarn guiding device which moves across the yarn. Textile machine according to one of Claims 13 to 15, characterized in that the cutting edge (600) is arranged transversely to the longitudinal direction and at an angle to the movement of the yarn support (F). Textile machine according to one of Claims 13 to 16, characterized in that the yarn cutting device (6) is arranged in relation to the tensioned yarn (F) in such a way that the angle α, between the straight line starting from the contact point and which runs perpendicular to the cutting edge (600) as well as in the defining surface (602) of the cutting edge (600) that is rotated to the yarn feed section and between the yarn feed line is greater than 90 °. Textile machine according to one of Claims 13 to 17, characterized in that the cutting edge (600) is arranged in such a way that the directional yarn direction vectors (F) have a parallel component to the cutting edge (600). Textile machine according to one of Claims 13 to 18, characterized in that the yarn cutting device (6) has a plurality of cutting edges (600) arranged in parallel. Textile machine according to one of Claims 13 to 18, characterized in that the yarn cutting device (6) has a plurality of cutting edges (600) which lie in parallel planes and cut in a normal projection. Textile machine according to one of Claims 13 to 20, characterized in that the yarn cutting device (6) has at least one rotating cutting edge (600). Textile machine according to one of Claims 13 to 21, characterized in that the at least one cutting edge (600) has a serrated edge. Textile machine according to one of Claims 13 to 22, characterized in that the at least one cutting edge (600) has a continuous cutting edge in its working section. Textile machine according to one of Claims 13 to 23, characterized in that the at least one cutting edge (600) has a straight or convex edge in its working section. Textile machine according to one of Claims 13 to 24, characterized in that at least one cutting edge (60) has a V-shaped cutting edge (600) and that the top of the V-shaped cutting edge (600) is arranged outside the cutting edge working portion . A retrofit kit for a textile machine having a plurality of identical workplaces having a yarn winding device (4) having a yarn winding device (F), with a service device that is movable along the work stations provided by the yarn feeding device (21) and a yarn delivery device (20), with a rotating yarn catching device (47) for catching, tensioning and storing the present yarn (F) as well as a yarn cutting device (6) that is stationary relative to a yarn catching device (47) with at least one cutting 4444 4 4 4 4 44 44 44 44 44 444 44 4 4 4 4 • 44444 • 4 A 4 edge (600) for cutting a tensioned and laid yarn (F), characterized in that the retrofit kit comprises a yarn cutting device (6) according to one of claims 13 to 25, which can be positioned at one or more fastening points the original yarn cutting device (6).