CN108502638B

CN108502638B - Yarn splicing device for stations of automatic winder

Info

Publication number: CN108502638B
Application number: CN201810154907.1A
Authority: CN
Inventors: S·斯查顿; M·沃尔夫
Original assignee: Saurer Germany GmbH and Co KG
Current assignee: Saurer Spinning Solutions GmbH and Co KG
Priority date: 2017-02-28
Filing date: 2018-02-23
Publication date: 2020-06-19
Anticipated expiration: 2038-02-23
Also published as: JP2018140875A; TR201800580A2; CN108502638A; DE102017104105A1; JP7060404B2

Abstract

The invention relates to a yarn splicing device (10) for a station (2) of an automatic winder (1) for the knotless connection of two yarn ends, comprising a yarn splicing prism (23) having a yarn splicing channel (27) which can be acted on by an air flow and is open upwards during a yarn splicing operation, and in which the yarn end is positioned during the yarn splicing operation. According to the invention, the splicing prism (23) is adjustably mounted on the stationary air distribution body (17) in such a way that the angular position of the central axis (34) of the splicing channel (27) of the splicing prism (23) is adjustable in relation to the angular position of the regular thread path (30) of the station (2).

Description

Yarn splicing device for stations of automatic winder

Technical Field

The invention relates to a yarn splicing device for the knotless connection of two yarn ends for stations of an automatic winder, comprising a yarn splicing prism body which has an air-flow-action-acceptable yarn splicing channel which is open upwards during the yarn splicing operation, and in which the yarn ends are positioned during the yarn splicing operation.

Background

In connection with the operation of workstations of textile machines, in particular automatic winding machines, which produce cross-wound bobbins, it has long been known to use yarn splicing devices for pneumatically connecting yarns, as is well described in numerous patent documents.

With such a yarn splicing device, two yarn ends that occur after a winding interruption, for example after a yarn break or a cut by a controllable yarn clearer, can be connected again by an air flow, so that almost the same connecting point as the yarn occurs.

For this purpose, the so-called upper thread, which, after the winding interruption, falls on the surface of the crosswound bobbins held in the creel of a station, is received by the suction nozzles of the station itself and is threaded into the joining channel of the joining prism of the joining device.

Almost simultaneously, a so-called drop is also taken from the unwinding bobbin in the unwinding position by means of the nipper bobbin and is also threaded into the yarn joining channel of the yarn joining prism, where the upper and lower yarns are finally joined by the air flow.

However, in order for the yarn connection to have an almost identical appearance and also an approximately identical yarn strength, the two ends must first be cut exactly short, prepared as intended and then joined in a clean air flow. That is, this yarn splicing device has not only the yarn clamping mechanism and the yarn cutting mechanism, and the hold-and-release pipe that can receive the air flow, but also the yarn splicing prism body having the yarn splicing passage that can receive the air flow.

However, in the operation of such air-operated yarn splicing devices, various problems can often occur in the yarn splicing operation.

The yarn joining air which is blown into the yarn joining channel of the yarn joining prism via the tangentially arranged yarn joining air nozzles not only generates, for example, a revolving flow which swirls the yarn ends to form a yarn joint, but also has an axial flow component which causes the yarn ends to move axially towards the yarn joining channel outlet, which in the case of various yarn materials can adversely affect the yarn joint.

The revolving flow is also often troublesome in the case of different yarn materials, since the yarn ends to be joined are not only twisted by the revolving flow during the joining operation to form yarn ends, but the revolving flow also leads to the formation of comparatively large loops of yarn which are punched out of the joining channel of the joining prism, which also adversely affects the joining operation.

In order to adapt the splicing device as well as possible to the yarn material, splicing devices have therefore been developed which differ with respect to the width of the splicing prism and/or with respect to the angular position of the splicing channel of the splicing prism.

Since it is known to process various different yarn materials successively or also simultaneously over time at an automatic winder station, which as mentioned above often impose quite different requirements not only with regard to their preparation but also with regard to their joining process, it is not uncommon to provide different splicing devices in connection with the automatic winder station, which can be individually adapted to the yarn materials.

In these known piecing devices, the piecing prism is usually fixed in/on the piecing head in a replaceable manner.

The yarn joining prisms used at present are, as described above, mostly different in terms of their width and in terms of the angular position of their yarn joining channel, depending on the yarn material to be processed.

In practice, it is usual, for example, to use a piecing prism whose width is 13 mm and whose piecing channel extends at an angle of 20 ° with respect to the conventional yarn path of the station. However, a piecing prism is also used which is 16 mm wide and whose piecing channels are arranged at an angle of 16.5 °. Furthermore, a piecing prism is known which has a width of 20 mm and whose piecing channels are arranged at an angle of 13.5 °.

Such a splicing device, which can be configured according to the yarn material to be processed, has proven itself in all day operation, but has the serious disadvantage that, in order to be able to ensure a correct yarn connection at each new yarn batch, a very large inventory of different splicing prisms is required.

In such a yarn splicing device, there is always the risk that incorrect components are inserted or that incorrect components are installed in the course of a reconstruction. In both cases, the result is very disadvantageous for the yarn connections to be subsequently made.

Disclosure of Invention

In view of a yarn splicing device of the aforementioned type, the invention is based on the task of developing a yarn splicing device which allows a quick and relatively simple reaction to a new yarn material in the event of a yarn material change. That is, a yarn splicing device should be provided which can be adapted to the requirements of new yarn materials in a simple manner.

According to the invention, this object is achieved in that the splicing prism is adjustably mounted such that the angular position of the central axis of the splicing channel of the splicing prism is adjustable in relation to the angular position of the regular yarn path of the station.

The embodiment of the yarn splicing device according to the invention has the advantage, in particular, that with a yarn splicing device of this type, all the requirements that may be present during a yarn material change can always be quickly and easily responded to. In other words, when using the yarn splicing device according to the invention, no relatively complicated reconstruction is required in the case of a yarn material change, and no large inventory of different types of yarn splicing prisms is required in order to be able to provide yarn splicing devices of different operation.

In order to be able to optimally cover the different requirements arising during the yarn material change, only a few relatively simple and uncomplicated adjustment steps are required, which can also be carried out by less qualified operators.

In the case of a yarn splicing device whose splicing prism is adjustably mounted on a stationary air distribution body, so that the angular position of the central axis of the yarn splicing channel of the splicing prism is adjustable in relation to the angular position of the regular yarn path of the work station, the time required for an optimal adaptation of the yarn splicing device is relatively short during a yarn material change. Accordingly, the unavoidable downtime of the automatic winder during the yarn material change is also minimal.

With the yarn splicing device according to the invention, it is therefore possible in a simple manner to always ensure optimum processing results without requiring relatively extensive and time-consuming reconstruction work, as has hitherto been customary, in the case of yarn material changes.

In an advantageous embodiment, it is also provided that the yarn splicing prism is mounted so as to be rotatable about the yarn splicing center.

This design ensures that the operator does not have to make any great effort to rotate the piecing prism after a yarn material change in order to optimally adapt the angular position of the piecing channel of the piecing prism to the currently existing yarn material.

I.e. on the one hand to ensure that proper yarn joining is always done, but on the other hand to ensure a smooth handling of the yarn ends and the joined yarn.

In the case of a yarn-joining channel whose angular position is to be set in relation to the yarn material, a smooth penetration of the yarn end to be joined is ensured, as well as a smooth removal of the joining yarn.

In an advantageous embodiment, for example, it is provided that the splicing prism is fastened to a rotatably mounted bearing means, which is provided with a locking element which, in cooperation with a corresponding locking groove provided in the air distributor body, allows a defined, stepwise adjustment of the angular position of the splicing channel of the splicing prism.

The locking element can be formed, for example, by a plurality of holes provided in the bearing mechanism, in which holes the pressure balls subjected to the action of the spring element are accommodated. The corresponding locking grooves are arranged in a semicircular shape and formed in the air distributing body.

In order to position the yarn joining channel of the yarn joining prism in an angular position, the bearing mechanism on which the yarn joining prism is arranged is simply rotated until the pressure ball locks into the locking groove on the air distributor, whereby the desired angular position of the yarn joining channel is precisely predetermined.

In an alternative embodiment, however, the following adjustment criterion (gauge) can also be used during the angular adjustment of the splicing channel of the splicing prism, i.e. a tool is used which allows a continuous (continuous) adjustment of the angular position of the splicing channel.

It can also be simply achieved by using this adjustment criterion that the piecing prism is always positioned with its piecing channel exactly in the desired angular position.

Independently of the means used for accurately positioning the piecing channel of the piecing prism, it is also provided in an advantageous embodiment that the bearing means have an opening through which a fixing screw extends, which fixing screw corresponds to a thread in the air distributor body. That is, the support means carrying and rotatably supporting the splicing prism can be fixed by means of bolts, respectively, which pass through openings provided in the support means and correspond to threaded holes in the air distributor body.

This screw connection is a fastening means which is proven in machine construction and which is not only easy to operate but also ensures that the splicing prism and thus the splicing channel of the splicing prism remain reliably in the currently adjusted position.

Furthermore, it is provided that the angle between the central axis of the yarn joining channel and the normal yarn path of the workstation is an angle of less than 30 °.

In an advantageous embodiment, the angle that can be set in relation to the yarn material is between 0 ° and 20 °.

In corresponding tests, it has been shown that all conventional yarn materials can be covered sufficiently by such an angular position. That is, in the case of raw yarn materials, a piecing prism is generally used whose piecing channel has an angular position of less than 15 °, for example 13.5 °. In the case of thin thread materials, the angular position of the receiving channel is usually more than 16.5 °, for example 20 °.

Drawings

Further details of the invention are described below in connection with the embodiments shown in the drawings, in which:

FIG. 1 shows a side view of an automatic winder station with a yarn splicing device according to the invention,

fig. 2 shows a top view of a yarn splicing device according to the invention, comprising a yarn splicing prism which is attached to an air distribution body of a workstation of an automatic winder by means of an adjustably mounted bearing mechanism, wherein the bearing mechanism is positioned such that the yarn splicing channel of the yarn splicing prism is arranged at an angle α of 20 ° with respect to the conventional yarn path of the workstation, and

fig. 3 shows the air distribution body according to fig. 2, which comprises a support mechanism positioned such that the yarn joining channel of the yarn joining prism is arranged at an angle α of 0 ° with respect to the conventional yarn path of the workstation.

Detailed Description

Fig. 1 shows a schematic side view of a workstation 2 of a textile machine for producing cross-wound bobbins, in the present example an automatic winder 1.

Such an automatic winder 1 actually has, between its end frames (not shown), a plurality of such stations 2 of generally identical construction, arranged side by side next to one another.

At station 2, also commonly referred to as a "winding unit" within the industry circle, an unwound bobbin, such as a cop 9 made on a ring spinning machine with less yarn material, is rewound into a large package of cross-wound bobbins 15.

After the production, the cross-wound bobbin 15 is transferred to a cross-wound bobbin conveyor 21 along the machine length and from there is fed to a bobbin loading station arranged on the machine end side.

In the present embodiment, the automatic winder 1 is also equipped with its own logistics means in the form of a pirn and empty bobbin conveying system 3, of which fig. 1 shows only the pirn supply section 4, the reversibly driven storage section 5, the transverse conveying section 6 leading to the winding unit 2 and the bobbin return section 7.

In the winding run, the pirn 9 or empty bobbin standing in place on the transport tray 8 circulates in said pirn and empty bobbin transport system 3.

The pirn 9, supplied by the pirn supply section 4 and previously temporarily stored in the storage section 5, is positioned at the unwinding position AS in the region of the transverse transport section 6 at the level of the station 2 and is then rewound into a large package cross-wound bobbin 15, in which the advancing yarn is simultaneously monitored during winding for yarn defects, which are immediately removed.

The individual stations 2 are for this purpose provided with various different means for ensuring correct operation of the stations 2, as is known and therefore only schematically shown in fig. 1.

Such a station 2 is equipped, for example, with a thread treatment or thread handling mechanism, such as a thread tensioner, a clearer with an associated thread cutting mechanism, a waxing device, a thread tension sensor and a doffing sensor.

The stations 2 of the automatic winder 1 are further provided with suction nozzles 12, a yarn nipper 25, and a yarn splicing device 10.

Furthermore, such automatic winding machines 1 generally have a central control unit 11, which is connected, for example, via a machine bus 16 to a station computer 29 of the individual stations 2.

As is also shown in fig. 1, the workstations 2 each have a winding device 24 for winding the cross-wound bobbin 15, the winding device 24 having in particular a creel 28 which is mounted so as to be movable about the axis of rotation 22 and is equipped with a mechanism for rotatably holding the bobbin of the cross-wound bobbin 15.

During the winding process, the crosswound bobbin 15, which is held freely rotatably in the creel 28, is driven by the yarn guide rollers 14, for example, by frictional engagement with their surfaces, e.g., against the yarn guide rollers.

Since such thread guide rollers 14 are known to have so-called thread guide grooves, the advancing thread is also guided during the winding process in such a way that it falls onto the winding bobbin in the form of a cross-wound layer.

Instead of a yarn guide drum, however, a slot-free bobbin drive roller can also be used, which rotates the cross-wound bobbin during winding only by frictional engagement.

In this case, the traversing of the thread running onto the cross-wound bobbin 15 takes place by means of a separate thread traversing mechanism, for example, with a thread guide finger.

When the thread end of the upper thread 31 falling onto the surface of the cross-wound bobbin 15 is to be received and transferred to the receiving device 10 after the winding interruption, a suction nozzle 12 mounted for limited rotation about the axis of rotation 13 is used.

Similarly, the head of the lower yarn 32 connected to the pirn 9 is treated after the winding interruption, with the nipper tube 25, which is limitedly rotatable about the rotation axis 20. That is, the nipper tube 25 receives the end of the lower yarn 32, which is generally fixed in the yarn tensioner, and also transfers it to the yarn joining device 10.

As shown in fig. 2 and 3, the piecing device 10, which is arranged slightly set back with respect to the conventional yarn path 30, i.e. occurring during winding, is arranged on a so-called air distributor 17, which is connected to a housing 33 of the station 2 by means of corresponding (not shown) holding means.

As also shown in fig. 2 and 3, the hold-

open tubes

18, 19 are placed into the air distributor body 17, and the ends of the upper yarn 31 and the lower yarn 32 are pneumatically prepared in the hold-

open tubes

18, 19 for the subsequent splicing process.

In addition, additional thread handling devices, which are not shown in the figures for the sake of a better overview, such as for example a thread clamping device, a thread cutting device and a thread feeder, are provided in the region of the piecing device 10.

The uncovered working piecing device 10, shown in front view in fig. 2 and 3, respectively, is provided with a piecing prism 23 which is arranged on an adjustable support mechanism 26 and has a piecing channel 27 which can receive compressed air as required. That is, the splicing prism 23 is fixed to a support mechanism 26, which is rotatably mounted in/on the air distribution body 17.

For this purpose, the air distributor 17, which is connected to the housing 33 of the station 2 of the automatic winder 1 by corresponding means, is provided with a bearing hole 39 for the bearing means 26, which is provided in the splicing centre 57.

The bearing mechanism 26 and thus the splicing prism 23 can thus be rotated into different angular positions in relation to the thread material to be processed.

As shown in fig. 2 and 3, the hold-

open tubes

18, 19 are additionally arranged into the air distribution body 17, whereby the ends of the upper and

lower threads

31, 32 are prepared for the splicing process.

The bearing mechanism 26, to which the splicing prism 23 is fixed, also has a locking element 35 which, in cooperation with a corresponding locking groove 38 provided in the air distributor 17, allows the angular position α of the central axis 34 of the splicing channel 27 of the splicing prism 23 to be adjusted in defined steps in relation to the conventional yarn path 30 of the station 2.

The locking member 35 may be formed, for example, by a hole (not shown) provided in the support mechanism 26, in which hole a pressing ball subjected to the action of a spring member is mounted.

The pressure ball under spring pressure engages in one of the locking grooves 38, which is arranged in the air distributor 17 in a semicircular shape, when the bearing mechanism 26 and thus the yarn splicing prism 23 rotate.

Each locking groove 38 defines an angle α of the yarn joining channel 27.

The set angular position can then be fixed by tightening the fixing screw 37.

Fig. 2 shows the yarn splicing device 10 in a top view with the yarn splicing prism 23 in place in such an angular position that the central axis 34 of the yarn splicing channel 27 of the yarn splicing prism 23 is arranged at an angle α of 20 ° with respect to the conventional yarn path 30 of the station 2.

Such a relatively large angular position of the piecing prism 23 of the piecing device 10 is preferably used when relatively fine yarn materials have to be processed, i.e. when the yarn end to be pieced is susceptible to forming relatively large loops of yarn which are punched out of the piecing channel 27 of the piecing prism 23 during the piecing operation.

Since such large loops adversely affect the splicing result, the formation of such loops must be prevented unconditionally, which is done in that the thread end is bent comparatively strongly at the outlet of the splicing channel because of the large angular position of the splicing channel 27 and at the same time abuts against the outlet of the splicing channel.

Due to the bending of the thread end and the abutment against the outlet of the splicing channel, it is ensured that the revolving flow applied to the thread end by the splicing air during the splicing operation is used in the splicing channel 27 for forming a defined splicing head.

That is to say that the applied yarn twist is prevented from leaving the yarn joining channel 27 possibly in the form of a loop and returning without work.

Fig. 3 shows a piecing device 10 in which the piecing prism 23 is in place in the initial position, i.e. in fig. 3 a piecing device 10 is shown in which the central axis 34 of the piecing channel 27 of the piecing prism 23 is arranged at an angle α of 0 ° with respect to the conventional yarn path 30 of the station 2, i.e. the central axis 34 of the piecing channel 27 of the piecing prism 23 runs parallel to the conventional yarn path 30.

In practice, the selected setting of the angular position of the splicing channel 27 of the splicing prism 23 is located between two positions as shown in fig. 2 and 3, in relation to the material of the yarn to be processed.

In the processing of thicker thread material, the smaller splicing prisms 23 are generally used here in order to make it more difficult or significantly prevent the threading of the thread end into the splicing channel 27 of the splicing prism 23 unnecessarily. One also takes advantage of the fact that the thread end made of thick thread material already abuts against the outlet of the yarn joining channel 27 at a small bending angle.

That is, when processing roving material, the small angular position of the piecing channel 27 of the piecing prism 23 is already sufficient to bend the thread end slightly by abutment against the outlet of the piecing channel and thus ensure that the revolving flow applied to the thread end by the piecing air during the piecing operation is used to form a proper piecing end and does not act as a loop.

In the case of processing spun yarn material, on the other hand, a larger angular position of the yarn joining channel 27 of the yarn joining prism 23 is advantageous, since in the case of thin yarn material a larger bending angle is required to ensure that the yarn end lies reliably against the yarn joining channel outlet and thus at least significantly hinders the formation of yarn loops.

Claims

1. A piecing device (10) for a workstation (2) of an automatic winder (1) for the knotless joining of two thread ends, comprising a piecing prism (23) having an air-flow-active piecing channel (27), which piecing channel (27) is open at the top during a piecing operation and in which the thread end is positioned during a piecing operation, characterized in that the piecing prism (23) is mounted in an adjustable manner on a stationary air distribution body (17) in such a way that the angular position of the central axis (34) of the piecing channel (27) of the piecing prism (23) can be adjusted in relation to the angular position of a regular thread path (30) of the workstation (2), wherein an angle (α) of less than 30 ° can be set between the central axis (34) of the piecing channel (27) of the piecing prism (23) and the regular thread path (30) of the workstation (2).

2. The piecing device (10) of claim 1, wherein the piecing prism (23) is mounted for limited rotation about a piecing center (57).

3. The piecing device (10) according to claim 1 or 2, characterized in that the piecing prism (23) is fastened to a rotatably mounted bearing mechanism (26) which has a locking element (35) which, in cooperation with a corresponding locking groove (38) provided in the air distribution body (17), permits defined, stepwise adjustment of the angular position of the piecing channel (27) of the piecing prism (23).

4. Piecing device (10) according to claim 1 or 2, characterized in that there are adjustment criteria which allow continuous adjustment of the angular position of the piecing channel (27).

5. A piecing device (10) according to claim 3, characterized in that the bearing means (26) has an opening (36) through which a fixing screw (37) extends, which fixing screw corresponds to a thread in the air-distributing body (17).

6. Piecing device (10) according to claim 1, characterized in that the angle (α) that can be set in relation to the yarn material is between 0 ° and 20 ° in the operating state of the piecing device (10).