DE102012008922A1 - Device for producing a piechable yarn end on an open-end spinning device - Google Patents

Abstract

The invention relates to a device for producing a piecemeal yarn end on an open-end spinning device of a rotor spinning machine on which a yarn is spun from a sliver presented, wherein the sliver dissolved by means of an opening roller to the single fiber and fed to a vacuum-charged spinning rotor, twisted and from there on Pulled off draw rolls and wound on a cross-wound bobbin, the device has a contact element for mechanically cutting and preparing the yarn end. According to the invention, it is provided that a contact element for the mechanical cutting and preparation of the yarn end is adjustable within the required Garnlängenbereiches that the stretched yarn end can be measured directly on the contact element and cut to length.

Description

The invention relates to a device for producing a piecemeal yarn end on an open-end spinning device of a rotor spinning machine on which a yarn is spun from a sliver presented, wherein the sliver dissolved by means of an opening roller to the single fiber and fed to a vacuum-charged spinning rotor, twisted and from there on Pulled off draw rolls and wound on a cross-wound bobbin, the device has a contact element for mechanically cutting and preparing the yarn end.

Rotor spinning machines have long been known and usually consist of a plurality of juxtaposed in series, similar jobs. Each of these jobs has a spinning and winding device at which the presented in a sliver can sliver is spun into a yarn and wound into a cheese.

The presented sliver is fed by means of a sliver feed cylinder of the opening roller, which dissolves the sliver in individual fibers with their clothing and transported to the fiber channel of the spin box. The fiber transport is supported by the negative pressure in the rotor housing, which generates an air flow in the fiber channel, releases the fibers from the dissolving set and conveys them into the rotor via the so-called channel plate adapter. As a result of the acceleration, the fibers slip into the collecting groove of the rotor, where they are collected according to the set yarn count, drawn off axially through the draw-off nozzle in the axis of rotation and thus twisted into a yarn and wound onto a cross-wound bobbin.

After a stoppage of the rotor spinning machine or after a yarn breakage, the spinning process must be resumed and the yarn end be re-spun to the fiber ring in the collecting groove of the rotor. This so-called piecing can be done either manually or automatically, and although automatic piecing is the most commonly used method today, rotor spinning machines are still in demand, where piecing must be at least partially manual. For this, the yarn end must be found on the cheese and some layers of the yarn are unwound before using a scala determines the required yarn length, the yarn is shortened accordingly and the yarn is prepared for piecing by the individual fibers are released from the fiber composite. The required yarn length is dependent on the diameter of the rotor. Contrary to the Garnabzugsrichtung so prepared yarn is performed in the withdrawal tube of the rotor and sucked by the negative pressure in the rotor housing. The cheese is pivoted down, that is, brought back into contact with the bobbin drive roller and as soon as the yarn end reaches the collecting groove of the rotor or the fiber ring lying therein, the prepared yarn end connects to the fiber ring and the spinning process can be continued; It creates a so-called piecemeal.

From the EP 1 749 906 A2 It is known to machine manual piecing without fully automating it. Here, the yarn must be manually measured at a stationary facility and then shortened to be prepared for piecing by a thread preparation apparatus carried by the operator. Technical improvements such as a yarn storage device, a targeted drive device of the cheese, a thread take-off device that can be driven reversibly and a manually activatable control device of the drives improve the quality of the piecer by controlled piecing of the yarn end to the fiber ring in the collecting groove of the rotor.

A particular disadvantage of this solution, however, is that the preparation of the yarn end is done by means of an entrained by the operator thread preparation device, which carries the risk that it is lost or forgotten and the yarn end can not be prepared as needed.

Both the DE-OS 25 34 816 as well as the DE-OS 2,203,198 describe rotor spinning machines where manual piecing is required. For this purpose, the rotor spinning machines have a so-called piecing aid, by means of which the yarn unwound from the cross-wound bobbin after a thread break can be measured to the required length and shortened by means of compressed air and prepared for subsequent piecing.

A disadvantage of this method is that the shortening and preparation by means of compressed air can not be realized equally well in all yarns; Especially with coarse yarns, these methods are insufficient. In addition, such devices require additional clamping and control elements, which in turn represent a complex and costly solution.

In the operating manual of the rotor spinning machine BD 416 of the company Oerlikon Schlafhorst in the version 10.05, which is considered the closest solution of the known prior art, the manual piecing is described. After the twine is found and unwound on the raised cheese, that must Yarn again threaded into the thread withdrawal device and formed in a mechanical thread storage a necessary for controlled piecing thread loop. The yarn is fed further to a scale which is mounted vertically on the front side of the spinning box cover and at which the required length can be measured. This point is clamped between the fingers of both hands and led to a grindstone, which is arranged above the scale, in order to shorten the yarn there respectively to prepare the yarn end. Finally, the yarn end can be returned to the rotor for piecing.

A disadvantage of this method is that the separation of the length measurement and shortening there is a risk that the yarn is shortened to an incorrect length and thus piecings arise that do not meet the required quality requirements.

The object of the invention is therefore to improve the at least partially manual piecing and the piecings of a rotor spinning machine by eliminating sources of error qualitatively and to simplify handling.

This object is achieved by the features listed in claim 1.

Advantageous embodiments of the invention are the subject of the dependent claims.

According to claim 1 it is provided that a contact element for mechanical cutting and preparation of the yarn end is adjustable within the required Garnlängenbereiches that the stretched yarn end can be measured directly on the contact element and cut to length. This means that according to the invention, the contact element is adjusted to the required yarn length and the yarn end, which was previously removed from the cheese, tensioned and guided to this contact element and thus forcibly reduced to the required yarn length.

The advantages achieved by the invention are in particular that errors that are eliminated due to the previously performed separately performed steps measuring the required yarn length at one point and the subsequent manual shortening of the yarn end by means of a knife or thread preparation device by simplifying and merging the steps.

An advantageous embodiment of the invention is specified in claim 2, which describes that the contact element is formed from a grindstone.

Through the grindstone, the yarn is prepared properly for subsequent piecing. The fibers are released from the yarn composite and are present as individual fibers, so that a pieceable yarn end is formed, which can be well bonded to the fiber ring in the collecting groove of the rotor and similar to the yarn produced during the spinning process.

Furthermore, according to claim 3, the apparatus has a scale for adjusting the contact element to the required yarn length. Based on the scale, the contact element can be easily brought into the position and locked there, which corresponds to the required yarn length.

In a further preferred embodiment of the present invention as described in claim 4, the device for severing the yarn and preparing the yarn end is mounted in close proximity to the sliver feed. This makes it ergonomically very user-friendly and improves the man-machine interface.

The invention will be explained in more detail with reference to an embodiment shown in the drawings.

Show:

1 a side view of a workstation of a rotor spinning machine with a device according to the invention for mechanically cutting to length and preparing the yarn end,

2 a detail in a schematic view of an embodiment of an open-end spinning device according to the invention

3 a detail in a schematic view of an embodiment of an open-end spinning device according to the invention with a prepared yarn end.

In 1 is a workstation of a rotor spinning machine 1 shown.

Such spinning machines have a variety of jobs 2 on, each with a spinning device 7 and a winding device 17 are equipped.

In the spinning device 7 that will be in sliver cans 3 submitted sliver 4 to a yarn 5 spun, that on the winding device 17 to a cheese 22 is wound up.

The winding device 17 has, as is known, a coil frame 18 to the rotatable Holding the sleeve of a cheese 22 , a bobbin drive roller 19 , a Fadenchangiereinrichtung 20 as well as a facility 21 for lifting the cheese 22 from the bobbin drive roller 19 on.

The spinning device 7 essentially, as also known, has a sliver draw cylinder 8th , a sliver-opening roller 9 as well as a spinning rotor 10 ,

According to embodiment of the 1 is the spinning rotor 10 for example, in a support disk storage 11 is stored and delivered via a machine-length tangential belt 12 driven.

Seen in the direction of yarn travel is behind the thread withdrawal device 13 also an unillustrated thread monitor and a thread storage device 14 intended.

Finally, in the field of sliver feeding, there is a device 23 arranged, the contact element 24 a defined cutting and preparation of a manually from the cheese 22 allows retrieved yarns.

2 shows the top view of an open-end spinning device according to the invention 7 in the field of sliver feed. The opening roller is covered by a cover 16 protected against the penetration of foreign particles. By means of the sliver draw-in cylinder 8th becomes the sliver 4 through the compressor 15 who made the sliver 4 compressed at the outlet opening, in the direction of the opening roller 9 transported.

In the immediate vicinity of the sliver feed is located on the respectively required yarn length vertically adjustable device 23 for mechanical cutting and preparation of the yarn end 6 for subsequent piecing, a grindstone 24 includes.

Analogous to 2 is in 3 likewise a plan view of an open-end spinning device according to the invention 7 shown in the field of sliver feeding, but with a shortened to the required yarn length and prepared for piecing yarn 6 ,

Function of the open-end rotor spinning machine according to the invention:

During the usual spinning process, this will happen in the open-end spinning device 7 generated yarn 5 by means of a thread withdrawal device 13 through the exhaust nozzle and the exhaust tube through the rotor 10 pulled out and on the winding device 17 to a cheese 22 wound.

About friction is the cheese 22 rotatable between the arms of a creel 18 is stored and on a bobbin drive roller 19 rests, driven in the winding direction. Through a Fadenchangiereinrichtung 20 that will be out of the rotor 10 withdrawn yarn 5 in crossing positions on the cheese 22 wound.

Occurs at one of the jobs 2 the rotor spinning machine 1 a thread break, this is detected by the thread monitor, the spinning process is interrupted and the job in question 2 stopped.

More specifically, the drive of the sliver draw-in cylinder 8th to the fiber feed to the opening roller 9 and ultimately in the rotor 10 to interrupt, off and lifting the cross-wound bobbin 22 from the bobbin drive roller 19 initiated, so that the yarn end 6 not in the cheese surface 22 can einwalken.

Before each piecing, before the yarn ends 6 into the spinning device 7 is returned, is usually the rotor 10 cleaned, accumulated fibers and any dirt that have a negative effect on piecing, from the rotor 10 to remove. This measure is preventive in order to increase the quality of the yarn. The cleaning of the rotor 10 is a known from the prior art and therefore not shown here and described approach.

Because the yarn end 6 of the yarn 5 usually due to the high winding speed after the yarn breakage is pulled out of the spinning box, the yarn end must 6 on the from the coil drive roller 19 lifted cheese 22 found and some layers of yarn 5 be handled by it. After a game change, the contact element 24 the device according to the invention 23 adjusted to the required yarn length, so that now after a yarn breakage of the cheese 22 upcoming yarn 5 strained and to the already set to the required yarn length grindstone 24 is stopped. By rubbing the yarn end 6 over the grindstone 24 becomes the yarn 5 shortened to the required yarn length required for piecing and optimally prepared for the subsequent piecing, by loosening the fibers from the fiber composite is caused by grinding and thus a Anspinnfähiger tuft on the yarn end 6 arises.

This yarn end 6 must be in the direction of the rotor in the direction opposite to the normal withdrawal direction through the extraction tube and the extraction nozzle 10 be introduced. After an unillustrated switching element, the control device of place of work 2 has been activated, the sliver feed cylinder 8th driven and the sliver 4 again the opening roller 9 and thus the rotor 10 supplied in the collecting groove again forms a fiber ring due to the high centrifugal acceleration. By operating a lever, not shown, the yarn reserve is released from the mechanical yarn storage, not shown, and the prepared yarn end 6 slides into the rotor groove.

In the rotor 10 There is still a negative pressure, the yarn end 6 in the rotor 10 soaks the prepared yarn end 6 with the fiber ring in the collecting groove of the rotor 10 combines. At the same time, the creel lowers 18 off until the cheese 22 again on the bobbin drive roller 19 lies and the emerging yarn 5 is on the cheese 22 wound.

With the continuous feeding of fibers and the stripping of the yarn 5 the re-spinning process begins.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1749906 A2 [0005]
• DE 2534816 A [0007]
• DE 2203198 A [0007]

Claims (4)

Device for producing a piecemeal yarn end on an open-end spinning device of a rotor spinning machine, on which a yarn is spun from a sliver presented, wherein the sliver dissolved by means of an opening roller to the individual fiber and supplied to a vacuum-charged spinning rotor, twisted and withdrawn therefrom via take-off rolls and on a cross-wound bobbin is wound up, the device having a contact element for mechanical cutting and preparation of the yarn end, characterized in that the contact element ( 24 ) is adjustable within the required Garnlängenbereiches that the tensioned yarn end ( 6 ) on the contact element ( 24 ) can be measured and cut to length. Device according to claim 1, characterized in that the contact element ( 24 ) is formed from a grindstone. Device according to claim 1, characterized in that the device ( 23 ) a scale ( 25 ) for adjusting the contact element ( 24 ) to the required yarn length. Device according to one or more of the preceding claims, characterized in that the device ( 23 ) for cutting the yarn ( 5 ) as well as the preparation of the yarn end ( 6 ) is mounted in the immediate vicinity of the sliver feeder.

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