CZ306471B6 - A device for yarn separation and the method of its production - Google Patents

Abstract

The device for yarn separation for a spindle of a spinning and twisting machine includes a shank of the spindle, the whorl (12) positioned on it and the annular body (1) for fastening in the whorl (12) area. The casing surface of the body (1) is provided with the runner grooves (3) having dips (5) located axially parallel to the shank of the spindle and the grooved teeth (4). The annular body (1) has the coaxial recess (7) in the form of an annular groove, whose outer diameter increases on the side facing away from the shank of the spindle, and thereby the grooving (3) is increasingly carved while forming the V-shaped cutting edges (6). The method of production lies in the fact that, firstly, the annular body (1) is provided with the runner grooving (3) on the casing surface, and subsequently the coaxial recess (7) is made in the shape of an annular groove by machining, by means of which the grooving (3) is cut with an increasing outer diameter (3), while forming the V-shaped cutting edges (6).

Description

Equipment for thread separation and method of its production

Field of technology

The present invention relates to a yarn separating device for a spindle of a spinning and twisting machine, comprising a spindle shaft and a recess located thereon, the yarn separating device having an annular body for mounting in the recess region and the housing surface of this body being provided with a circular groove having recesses positioned axially parallel to the spindle shaft and knurled teeth. The invention also relates to a method of manufacturing this yarn separating device.

Prior art

ZEP 0 278 561 B1 is a known sleeve holder - round nut, which is located on the shaft of the spinning and spindle. The socket holder - circular nut has two spaced, radially outwardly extending running projections, on the mantle surface of which axially parallel grooves are formed. The grooves serve to guide the thread to the underlying bundle, on which the thread is wound by means of multiple windings into the spool. To separate the thread, at least one blade is arranged in the vertical position in the bottom of the groove of the lower protrusion to separate the thread when shearing at a very acute angle. At least one blade is made as a separate component. Alternatively, the blade is made by machining the bottom of the raceway. EP 0 278 561 B1 leaves open as the bottom of the groove of the lower protrusion is machined to form at least one blade. From the exemplary embodiment shown and only describes how the separate blade is used and fastened.

The yarn separating device designed in this way is very expensive to manufacture, since in order to form a blade, a corresponding recess must be formed in the lower projection, into which at least one blade can be fastened. On the other hand, it leaves the expert with a solution on how to perform a cost-effective and efficient production of the cut blade in the description of the machining of the bottom of the raceway. Cutting out the shape for the blade, in particular when additionally profiling the cutting edge of the blade, as determined according to EP 0 278 561 B1, appears to the person skilled in the art to be difficult to implement technically and correspondingly expensive.

The essence of the invention

Based on the state of the art, it is an object of the invention to provide a yarn separating device which can be produced in comparison with the prior art with low construction costs and cost-effectively, as well as a method cost-effective for producing such a yarn separating device.

From the point of view of the yarn separating device, this is achieved by the features of claim 1, as well as in relation to the method by the features of claim 7.

Advantageous embodiments of such a thread separation device are the subject matter of the dependent claims.

The embodiment of the yarn separating device according to the invention consists in that the annular body of the yarn separating device comprises a coaxial recess in the shape of an annular groove, the outer diameter of which increases on the side facing away from the spindle shaft, and thus the corrugation is increasingly cut to form cutting edges in The V-shaped device thus formed can be produced cost-effectively on account of its simple design, since the production is carried out on a machine tool, in particular on automatic lathes. In this case, the formation of annular recesses on the inside of the knurled teeth leads to the automatic production of cutting edges on the notches. The gray edges converge in a wedge-shaped manner depending on the bevel of the surface on the inside of the groove. The wedge shape promotes gripping and separation of the thread during shearing.

Preferably, the outer diameter of the recess can be increased continuously, thus creating a uniformly formed surface on the side of the knurled teeth facing the spindle shaft.

In a preferred further embodiment of the invention, the inclination of the outer edge of the recess may extend at an angle of less than 45 °, preferably at an angle between 15 ° and 35 °, to the longitudinal axis of the spindle shaft. The inner sides of the knurled teeth thus have a conical course.

Preferably, the annular body may have a protrusion in the form of a hollow cylinder which extends coaxially to the longitudinal axis of the spindle shaft. The surface of the protrusion serves as a spool for the thread for preparing the smearing. The surface of the projection can be provided with profiling. By profiling, improved adhesion of the wound thread in the zone of the spool is achieved.

In an alternative embodiment, the yarn separating device can be formed as part of a crossbar. In addition to the already described embodiment of the yarn separating device and the yarn separating device in one piece, the yarn separating device as a separate part of the spindle represents another cost-effective alternative to the prior art.

According to claim 7, it is proposed that the annular body is first provided with a circular groove on its surface and then a coaxial recess in the shape of an annular groove is produced by machining, which is cut with increasing outer groove diameter to form V-shaped cutting edges. according to the invention, the cutting edges can be formed at low cost in one working step. The production of the yarn separating device according to the invention is carried out by machining the starting material, which is preferably processed on automatic lathes, thus enabling cost-effective production in a large number of pieces.

Explanation of drawings

The invention is explained in more detail below with the aid of exemplary embodiments shown in the drawings. The drawings show:

Giant. 1 is a perspective view of a yarn separating device;

Giant. 2 is a partial sectional view of the inside of the yarn separating device according to FIG. 2;

Giant. 3 is a view of the inside of the yarn separating device according to FIG. 1 in partial section;

Giant. 4 is a perspective view of a second embodiment of a yarn separating device, and

Giant. 5 is a perspective view of a third embodiment of a yarn separating device.

Examples of embodiments of the invention

The spinning and twisting machines have a number of spinning points which are located on at least one side of the machine in its longitudinal direction at a distance from each other. At each of these spinning stations, a spindle is located, which is driven so that the yarn conveyed by the upstream spinning elements is wound into a spool on the core. Therefore, the spindle includes a spindle and a spindle shaft. In order to exchange the finished spool for an empty tube, a known spool exchange device is used. The spool is replaced by pulling the sleeve carrying the spool from the spindle. In this case, the thread on each spindle is separated between the spool winding and the coil wound under the sleeve. Thread separation is achieved by the yarn separation device described below.

Fig. 1 shows a perspective view of a yarn separating device according to the invention. The yarn separating device consists of an annular body 1 which has a substantially p-shaped cross section

-2GB 306471 B6 mene U. The body 1 has a circular hole 2 which allows the yarn separating device to be located in the area of the sieve located on the spindle shaft. The opening 2 is delimited by a lining 9, by means of which the thread separating device can be placed in the area of the overhang, for example by means of a hot fit or a press fit. On the side facing away from the opening 2, the surface of the housing of the body 1 is provided with a circular groove 3. The groove 3 is formed by knurled teeth 4 and depressions 5, which are located parallel to the longitudinal axis of the body LV of the depressions 5. V-shaped.

The figures in Figs. 2 and 3 show a partial sectional view of the inner side as well as the outer side of the yarn separating device. The knurled teeth 4 have a substantially wedge-shaped profile outside, as shown in FIG. The annular body 1 has, as shown in FIG. 2, a coaxial recess 7 in the shape of an annular groove, which has an inclination to the longitudinal axis of the spindle shaft. The outer diameter of the annular groove-shaped recess 7 increases along the side facing away from the spindle shaft, whereby the grooving is increasingly cut to form V-shaped cutting edges 6. This is done by machining the grooved teeth 4, preferably by turning on automatic lathes. The increase in the outer diameter of the recess 7 is preferably continuous.

For the production of the thread separation device, a groove 3 is first formed on the surface of the housing of the annular body 7. Subsequently, a coaxial recess 7 in the form of an annular groove is formed by machining. By machining the groove 3 on its side facing the spindle shaft, the knurled teeth 4 terminating in the base of the recess 7 are cut out so that, depending on the inclination of the outer edge of the recess 7, which has a spindle axis, cutting edges 6 are formed between the recesses 5. different opening angles. The angle of inclination is less than 45 °, in particular between 15 ° and 35 °. The cutting edges 6, formed in the shape of a letter V on the edges of the knurled teeth 4, serve to clamp and separate the thread when changing the spool. In addition, the detached thread grips the run-out of the cutting edges 6 at an acute angle to the bottom of the recess 7 and thus enhances the effect of the cutting edges 6.

Figures 4 and 5 show further embodiments of a yarn separating device according to the invention. The illustration in Fig. 4 shows an annular body 1 having a protrusion 10 in the form of a hollow cylinder. The protrusion 10 extends from the lining 9 defining the hole 2 coaxially with the longitudinal axis of the spindle shaft. The surface of the protrusion 10 is provided with a profiling 11. The profiling 11 serves to take over more windings of yarn when changing the twist, while the adhesion on the surface of the protrusion 10 is increased by the profiling 11.

According to an embodiment of the yarn separating device shown in FIG. 5, this is formed as part of the screen 12. The annular body 1 as well as the cutting edges 6 of the yarn separating device are formed from it in the manner already described.

Claims (7)

PATENT CLAIMS A yarn separating device for a spindle of a spinning and twisting machine, comprising a spindle shaft and a recess located thereon, the yarn separating device having an annular body (1) for mounting in the recess area (12) and the housing surface of this body (1) being provided with a running groove (3) having depressions (5) arranged axially parallel to the spindle shaft and knurled teeth (4), characterized in that the annular body (1) has a coaxial recess (7) in the form of an annular groove, the outer the diameter increases on the side facing away from the spindle shaft, and thus the groove (3) is increasingly cut to form V-shaped cutting edges (6). Thread separating device according to Claim 1, characterized in that the outer diameter of the recess (7) increases continuously. -3 CZ 306471 B6 Thread separating device according to one of Claims 1 or 2, characterized in that the angle of inclination of the outer edge of the recess (7) to the longitudinal axis of the spindle shaft is less than 45 °, in particular between 15 ° and 35 °. Thread separation device according to one of Claims 1 to 3, characterized in that the annular body (1) has a projection (10) in the form of a hollow cylinder which extends coaxially to the longitudinal axis of the spindle shaft. Thread separating device according to Claim 4, characterized in that the surface of the projection (10) is provided with a profile (11). Thread separating device according to one of Claims 1 to 5, characterized in that it is designed as part of an overhang (12). Method for producing a yarn separating device according to one of Claims 1 to 6, characterized in that first, the annular body (1) is provided on its surface of the housing with a circulating groove (3), and - subsequently, a coaxial recess (7) in the shape of an annular groove is produced by machining, by which it is cut with an increasing outer diameter of the groove (3) to form V-shaped cutting edges (6).