DE102017124836A1 - Opening roller and method for producing such an opening roller - Google Patents

Abstract

The invention relates to an opening roller (30) for separating fibers of a fed sliver in a spinning machine (1), in particular an open-end spinning machine, wherein the opening roller (30) at least one toothed set (32) with a plurality of teeth arranged in series ( 34a, 34b). In order to be able to provide an opening roller (30) which may have tooth sets (32) whose teeth (34a) have a tooth shape which can not readily be produced by means of turning, milling or grinding, it is provided that at least one tooth (34a) one of the plurality of teeth (34a, 34b) has a tooth shape formed by wire eroding.

Description

The invention relates to an opening roller for separating fibers of a fed sliver in a spinning machine, in particular an open-end spinning machine.

Opening rollers have long been known and described in various embodiments. Such opening rollers serve to dissolve in rotation a fiber sliver deposited in sliver cans and fed to a workstation of the spinning machine or presented in individual fibers. The individual fibers are then fed by the opening roller through a fiber guide a spinning unit of the spinning machine and spun into a yarn. The spinning machine may, for example, be an air spinning or rotor spinning machine.

The opening rollers comprise one or more sets of teeth, each having a plurality of teeth arranged in series at least, which in their entirety may constitute a tooth arrangement extending spirally in the circumferential direction of the opening roller. The teeth are usually formed by turning, grinding or milling similar, as exemplified in the documents DE 102 24 188 A1 . DE 37 30 297 A1 and WO 2007/090501 A1 disclosed.

However, the teeth of such manufactured opening rollers are limited by the method due to the shape of the possible tooth shapes. In addition, with an opening roller, the teeth of which are formed, for example. By means of a conventional automated grinding process of a solid ring, conventionally provided only a tooth shape. In this case, different grinding wheels are also to be provided for different opening rollers, which differ from each other by their tooth form. However, the tooth shape is decisive for the dissolution and transport behavior of an opening roller.

The present invention is intended to provide an opening roller which may have tooth sets whose teeth have a tooth shape which can not readily be produced by means of a machining production method such as turning, milling or grinding.

To this end, the present invention proposes an opening roller having at least one tooth set with a plurality of teeth arranged in series, wherein at least one tooth of the plurality of teeth has a tooth shape formed by wire eroding. Wire erosion is known to be an electrothermal separation process in which the material-removing effect of electrical discharges between two electrodes formed by the workpiece and a wire is utilized. In contrast to machining processes such as turning, grinding and milling, wire erosion does not involve any mechanical removal of material.

The present invention makes it possible to provide a wider variety of tooth forms for opening rollers, which can thereby be more easily adapted to the properties of the sliver in an optimum manner, as compared with the mechanical material-removing method with the electrothermal separation method a more precise geometry complexity , Linearity, surface quality and the ability to form smallest corner radii, resulting in an opening roller with improved dissolution and transport behavior can be achieved. This can also have a positive effect on the yarn values of the yarn to be spun, which further achieves improved yarn quality.

According to a preferred embodiment, the tooth shape may have a shape that is different from tooth shapes that can be formed by turning, milling or grinding. For example, the tooth form may have an undercut, which is further preferably formed on a tooth back and / or in the region of a tooth root of the tooth. In particular, the undercut formed on the back of the teeth can be a positive undercut, which is characterized by a projection such as, for example, a bulge. Such a protruding undercut is generally referred to as a positive undercut. On the other hand, for example, an undercut formed in the region of the tooth base can be a negative undercut, which is characterized by a recess or groove or by a tapering of the tooth form in the area of the tooth base. Such a positive and negative undercut can furthermore preferably be formed into one another with the tooth. Such undercuts described by way of example in particular lead to an improved dissolution behavior of the opening roller.

According to a preferred embodiment, the tooth form may be different from at least one, in particular produced by wire EDM, tooth shape of another tooth of the plurality of teeth. More preferably, the at least one tooth and the other tooth are arranged adjacent to each other. Adjacent in this context is the arrangement of the two teeth without a further interposed tooth to understand. The adjacent assembly may preferably be along the serially arranged teeth or in a direction transverse thereto. The series arrangement of the teeth can be dependent on the configuration of the teeth-wearing tooth set preferably in the circumferential direction of the opening roller or in a direction transverse thereto. As a result, an opening roller with teeth of different tooth shapes can be provided on a single peripheral surface compared to previously available conventional opening rollers, which can have a positive effect on the dissolving and / or transport behavior of the opening roller depending on the type of fiber to be dissolved fiber sliver.

The formation of the tooth forms of the teeth can be provided as required by the method. For example, the tooth shape of all the teeth or only selected teeth of the opening roller may be formed by wire eroding, while in the latter, the tooth shape of the remaining teeth may be formed by a machining process such as, for example, turning, milling or grinding. Preferably, in a provided for forming an opening roller tooth set with at least two different methods trainees tooth molds first the machining process and then the electrothermal separation process, so the wire erosion applied, whereby the opening roller or the corresponding tooth set is reduced and partly also cheaper to produce ,

Further features and advantages of the invention will become apparent from the following description of preferred embodiments of the invention, with reference to the figures and drawings showing essential to the invention details, and from the claims. The individual features may be implemented individually for themselves or for several in any combination in a preferred embodiment of the invention.

Preferred embodiments of the invention are explained below with reference to the accompanying drawings.

• 1 eine schematische Seitenansicht, teilweise im Schnitt, einer Rotorspinnvorrichtung;
• 2 eine schematische Seitenansicht eines Ringsegmentausschnitts einer Zahngarnitur einer herkömmlichen Auflösewalze;
• 3 eine schematische Seitenansicht eines Ringsegmentausschnitts einer Zahngarnitur einer Auflösewalze nach einem Ausführungsbeispiel;
• 4 eine schematische Seitenansicht eines Ringsegmentausschnitts einer Zahngarnitur einer Auflösewalze nach einem weiteren Ausführungsbeispiel;
• 5 eine schematische Seitenansicht eines Ringsegmentausschnitts einer Zahngarnitur einer Auflösewalze nach einem weiteren Ausführungsbeispiel;
• 6 ein schematischer Verfahrensablauf zum Herstellen einer mit den mit den 3 bis 5 gezeigten Auflösewalze nach einem bevorzugten Ausführungsbeispiel.

Show it:

• 1 a schematic side view, partially in section, of a rotor spinning device;
• 2 a schematic side view of a ring segment cutout of a toothed set of a conventional opening roller;
• 3 a schematic side view of a ring segment cutout of a toothed set of an opening roller according to an embodiment;
• 4 a schematic side view of a ring segment cutout of a toothed set of an opening roller according to another embodiment;
• 5 a schematic side view of a ring segment cutout of a toothed set of an opening roller according to another embodiment;
• 6 a schematic process for producing a with the with the 3 to 5 shown opening roller according to a preferred embodiment.

In the following description of preferred embodiments of the present invention, the same or similar reference numerals are used for the elements shown in the various figures and similarly acting, wherein a repeated description of these elements is omitted.

1 shows a schematic side view, partially in section, of a rotor spinning device 1 , Such rotor spinning devices 1 As known, each has a rotor housing 2 in which the spinning cup of a spinning rotor 3 revolves at high speed.

The spinning rotor 3 is for example with its rotor shaft 4 in Lagerzwickeln a so-called support disk storage 5 supported by a machine-length tangential belt 6 that by a pressure roller 7 is acted upon, frictionally driven. The axial fixation of the rotor shaft 4 takes place for example by a permanent magnetic thrust bearing 18 ,

The rotor housing, which is open towards the front 2 is during the spinning operation by a pivotally mounted cover member 8th closed, in which a channel plate is embedded, with a circumferential lip seal 9 on the rotor housing 2 is applied.

The rotor housing 2 is also via a corresponding vacuum line 10 to a vacuum source 11 connected in the rotor housing 2 necessary spin negative pressure generated.

In a recording of the (not shown) channel plate is replaceable a channel plate adapter 12 arranged, the mouth of a Faserleitkanals 14 and a yarn withdrawal nozzle according to the invention 13 has, to which a thread withdrawal tube 15 followed.

Furthermore, in the lid member 8th that is about a pivot axis 16 limited rotatably mounted, integrated a Faderbandauflöseeinrichtung.

In other words, the cover element 8th an opening roller housing 17 and rear bearing brackets 19 . 20 for storage of a opening roller 30 or a sliver draw-in cylinder 22 on.

The opening roller 30 This is achieved by a circumferential, machine-long tangential belt 24 , the one whisker 23 the opening roller 30 energized, while driving the sliver feed cylinder 22 preferably via a machine-length drive shaft 25 he follows.

2 shows a schematic side view of a schematic ring segment cutout of a toothed set 32 a conventional opening roller 30 , like this example in the with 1 shown rotor spinning device 1 used. The tooth set 32 has a plurality of teeth arranged at least in series 34 on. The variety of teeth 34 are all formed by means of a machining production process and have an identical tooth shape with respect to production-related tolerances. In detail, every tooth has 34 one starting from a trained under a defined radius front tooth base 36 rectilinear toothbrush 38 with an approximately rectilinear tooth tip adjacent thereto 40 and one of them to a rear tooth base formed under a defined radius 44 rectilinearly leading back of the teeth 42 on. It forms a tooth 32 associated posterior tooth base 44 at the same time a front tooth base 36 for an immediately following tooth 34 out.

3 shows a schematic side view of a schematic ring segment cutout of a toothed set 32 an opening roller 30 according to a preferred embodiment, such as this example. In the 1 shown rotor spinning device 1 can apply. In contrast to 1 includes the toothed set 32 in the illustrated ring segment cut two successively arranged teeth 34a . 34b with mutually different tooth shape. The Indian 3 illustrated middle tooth 34a is compared to those in the 3 shown adjacent teeth arranged 34b in particular, in relation to the tooth face 38 , the tooth tip 40 as well as the back of the teeth 44 designed differently. This is how the tooth's breast closes 38 of the middle tooth 34a with a center vertical MS of the opening roller 30 a smaller angle than the respective tooth face 38 the other two teeth 34b , Furthermore, the tooth tip 40 of the middle tooth 34a shorter than the tooth tip 40 the other two teeth 34b formed and also extends transversely to a direction of the adjacent tooth tips 40 , Furthermore, the back of the teeth 42 of the middle tooth 34a longer than the respective tooth back 42 the two adjacent teeth 34b ,

The middle tooth 34a has been exemplified by an electrothermal separation method such as wire EDM, whereas the two adjacent teeth 34b have been formed in advance by a machining production process such as, for example, turning, grinding or milling. Alternatively, all teeth of the toothed set 32 and / or the opening roller 30 be made by wire eroding.

4 and 5 each show a schematic side view of a schematic ring segment cutout of a toothed set 32 an opening roller 30 according to a further preferred embodiment, as this example. In the 1 shown rotor spinning device 1 can apply. The tooth forms of the respective teeth 34a are formed under consideration of production-related tolerances by means of wire EDM identical to each other.

With 4 shown tooth shape differs from the other preferred embodiments substantially by providing a combination of a positive and negative undercut and a positive undercut 46 and a negative undercut 48 , The positive undercut 46 is in the area of the back of the teeth 42 formed and characterized by a defined selected magnification of the tooth thickness or by a predetermined selected bulge. The negative undercut 48 closes in this preferred embodiment directly to the positive undercut 46 in the posterior tooth base 44 passing over and is characterized by a taper of the tooth thickness compared to the positive undercut 46 characterized.

With 5 a tooth shape is shown, which differs from the other preferred embodiments in that the tooth face 38 and the back of the teeth 42 of every tooth 34a in a defined section starting from the tooth tip 40 parallel to each other, with the tooth tip 40 a groove 40a includes.

6 schematically shows a sequence of a method 100 to make one with the 3 to 5 shown opening roller 30 according to a preferred embodiment. In the process 100 For example, the tooth shape of a tooth of the plurality of teeth of the opening roller arranged at least in series is formed by wire eroding. The tooth shape of the other teeth of the opening roller is respectively formed by a method different from wire EDM, such as the machining manufacturing method. This will be done in a first step 110 the tooth shape of the other teeth, with one tooth on a common Zahngarnitur are arranged, formed by an automated grinding process. In a subsequent second step 120 The tooth shape of the one tooth is formed by wire erosion.

The shape and size of the respective teeth 34a . 34b can be suitably selected. Usually, the tooth size moves in the millimeter range. So can with the with the 3 to 5 shown preferred embodiments one of the tooth base 36 ; 44 to the tooth tip 40 rectilinear tooth height, for example, be in the range of 1 mm to 3 mm. One from a toothbrush 38 a first tooth 34a to a tooth breast 38 a subsequently arranged second tooth 34a ; 34b straight-line tooth spacing may be in particular in the range of 2.5 mm to 5 mm. One in the circumferential direction of the opening roller 30 between tooth face 38 and back of the teeth 42 straight-line tooth thickness may preferably vary in the range of 0.05 mm to 3 mm depending on the configuration of the tooth shape and measuring point of the tooth thickness. One between a center vertical MS of the opening roller 30 and the toothbrain 38 included, a Zahnanstellwinkel defining angle can be selected for example between 10 ° and 25 °.

The with the 3 to 5 tooth forms shown in an exemplary and not conclusive manner, which diverse, especially with customary machining machining processes can not be readily formed tooth forms by wire EDM for tooth sets of opening rollers can be achieved. Although this is not explicitly shown in the figures, a shape or cross-sectional shape of the tooth flanks, that is, the opposite side surface portions of a tooth, which connect the tooth face to the back of the teeth, are made suitable and needs-based. By means of the present invention, it is thus possible to design a tooth shape that is coordinated with the fiber type of the sliver to be dissolved in order to be able to improve in particular the dissolving and transport behavior of the opening roller and / or yarn values of the thread to be spun.

The embodiments described and shown in the figures are chosen only by way of example. Different embodiments may be combined together or in relation to individual features. Also, an embodiment can be supplemented by features of another embodiment.

If an exemplary embodiment comprises a "and / or" link between a first feature and a second feature, this can be read so that the embodiment according to one embodiment, both the first feature and the second feature and according to another embodiment either only first feature or only the second feature.

LIST OF REFERENCE NUMBERS

1

Rotor spinning device

2

rotor housing

3

spinning rotor

4

rotor shaft

5

Support disk bearing

6

tangential

7

capstan

8th

cover element

9

lip seal

10

Vacuum line

11

Vacuum source

12

Channel plate adapter

13

off nozzle

14

fiber guide channel

15

Yarn withdrawal tube

16

swivel axis

17

Opening roller housing

18

thrust

19.20

bearing bracket

22

Sliver intake cylinder

23

whorl

24

tangential

25

drive shaft

30

opening roller

32

toothed clothing

34

tooth

34a

tooth formed by wire EDM

34b

tooth formed by machining process

36

front tooth base

38

tooth face

40

tooth tip

42

tooth back

44

back tooth base

46

positive undercut

48

negative undercut

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

• DE 10224188 A1 [0003]
• DE 3730297 A1 [0003]
• WO 2007/090501 A1 [0003]

Claims (7)

Opening roller (30) for separating fibers of a fed sliver in a spinning machine (1), in particular an open-end spinning machine, wherein the opening roller (30) at least one toothed set (32) having a plurality of at least in series teeth (34a, 34b) characterized in that at least one tooth (34a) of the plurality of teeth (34a, 34b) has a tooth shape formed by wire eroding. Opening roller (30) to Claim 1 , characterized in that the tooth form comprises an undercut (46, 48). Opening roller (30) to Claim 1 or 2 , characterized in that the tooth shape is different from at least one, in particular produced by wire EDM, tooth shape of another tooth (34b) of the plurality of teeth (34a, 34b). Opening roller (30) to Claim 3 , characterized in that the at least one tooth (34a) and the other tooth (34b) are arranged adjacent to each other. A method (100) for manufacturing an opening roller (30) according to any one of the preceding claims, characterized in that a tooth shape of at least one tooth (34a) of the plurality of teeth (34) arranged in series is formed by wire eroding. Method (100) according to Claim 5 , characterized in that a tooth shape of at least one other tooth (34b) of the opening roller (30) is formed by a method different from wire EDM, in particular by a machining process. Method (100) according to Claim 6 characterized in that the tooth shape of the at least one other tooth (34b) and the tooth shape of the at least one tooth (34a) are formed on a common tooth set (32), wherein first the tooth shape of the at least one other tooth (34b) through Wire EDM different methods and then the tooth shape of the at least one tooth (34 a) are formed by wire erosion.

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